WO2014100919A1 - Device with general structure for driving multiple light-emitting diode strings - Google Patents
Device with general structure for driving multiple light-emitting diode strings Download PDFInfo
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- WO2014100919A1 WO2014100919A1 PCT/CN2012/001757 CN2012001757W WO2014100919A1 WO 2014100919 A1 WO2014100919 A1 WO 2014100919A1 CN 2012001757 W CN2012001757 W CN 2012001757W WO 2014100919 A1 WO2014100919 A1 WO 2014100919A1
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- controllable
- led
- strings
- string
- led string
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/40—Details of LED load circuits
- H05B45/44—Details of LED load circuits with an active control inside an LED matrix
- H05B45/48—Details of LED load circuits with an active control inside an LED matrix having LEDs organised in strings and incorporating parallel shunting devices
Definitions
- the present invention relates to illumination devices for light emitting diodes, and more particularly to a device for driving a plurality of controllable LED strings. Background technique
- LEDs Light-emitting diodes
- LEDs are semiconductor-based light sources that are often used in low-energy meters and appliances, and the use of light-emitting diodes in various lighting devices has become more common. For example, high-brightness LEDs have been widely used in traffic lights, vehicle lights, and brake lights.
- the current-to-voltage (IV) characteristic curve of the LED is similar to that of a normal diode.
- the voltage applied to the LED is less than the forward voltage of the diode, only a very small current flows through the LED.
- the voltage exceeds the forward voltage the current through the LED is greatly increased.
- the illumination intensity of an LED-based illumination device is proportional to the current passed, but not at high currents.
- Drives typically designed for light-emitting diode-based lighting devices are designed to provide a constant current to provide stable light and extend the life of the LED.
- a plurality of LEDs are usually connected in series to form an LED-based illumination unit, and most of the LED-based illumination units can be further connected in series to form an illumination.
- U.S. Patent No. 6,777,891 discloses a plurality of LED-based illumination units forming a computer-controlled string of lights, each of which forms a separately controllable node in the string.
- the operating voltage required for each illuminator is usually determined by the forward voltage of the LEDs in the lighting unit, how many LEDs are in each lighting unit, how each lighting unit is connected to each other, and each The lighting unit is in the lighting device, how it receives the voltage from the power supply. Therefore, in most applications, some type of supply voltage conversion device is required to convert a generally more common high voltage power supply to a lower voltage to provide one or more LED-based lighting units. . Because such a voltage conversion device is required, the efficiency of the LED-based lighting device is reduced, the cost is increased, and it is difficult to reduce its volume.
- U.S. Patent No. 778,1979 provides a device for controlling a series of light emitting diodes.
- Two or more of the light emitting diodes are connected in series, and when a voltage is applied, a series current flows through the light emitting diode. At least one of the light emitting diodes is connected in parallel with one or more controllable current paths to cause a series current to flow through the controllable current paths so that a generally more common high voltage power supply can be used without the need for a voltage conversion device. Therefore, the device can use an alternating voltage such as 120V or 240V.
- US Patent Publication No. 2010/0308739 discloses a device in which a plurality of light emitting diodes are connected in series to form a plurality of LED segments, and a plurality of switches are connected to the plurality of LED segments to select and control a certain LED segment. It is connected in series or separated from one LED series current path.
- U.S. Patent Publication No. 201 1/0085619 discloses a selection circuit for driving a plurality of different lengths of light emitting diode strings to selectively turn on or off certain light emitting diode strings in accordance with corresponding input AC voltages.
- U.S. Patent Publication No. 2012/0217887 discloses an illumination device and control method for a light-emitting diode that provides an average luminous intensity under varying voltages of an alternating current source.
- the present invention provides an efficient illumination LED lighting device that can accommodate different voltages of different input AC power sources.
- the LED lighting device provided by the invention has a range of input voltages that can be automatically detected, and a plurality of controllable LED strings are connected between A common structure that is connected in series, parallel or short circuit.
- the number of light-emitting diodes connected in series within each controllable LED string can be adjusted according to the change of the input voltage with time.
- the apparatus includes a plurality of controllable LED strings interleaved with a plurality of switching units, each switching unit being coupled to a leading controllable LED string and a trailing controllable LED string.
- Each controllable LED string includes a plurality of light emitting diodes connected between its positive and negative terminals, and a plurality of control switches, each of which corresponds to a light emitting diode.
- each switching unit Under the control of a controller, the operating state of each switching unit can be controlled such that the switching unit forms its leading and trailing controllable LED strings in series or in parallel, or shorts its leading controllable LED string .
- each control switch and its corresponding one of the light emitting diodes are connected in parallel with each other, and the above controller outputs a control signal to control the control, and the control switch is turned on or off to adjust the LED string.
- the number of light-emitting diodes connected in series with each other.
- the apparatus comprises a structure for driving a plurality of controllable LED strings interleaved with a plurality of switching units, similar to the first embodiment, but in each of the controllable LED strings
- the manner in which the control switch is connected to the corresponding light emitting diode is different from that of the first embodiment.
- Each control is connected from the positive terminal of the corresponding LED to the negative terminal of the controllable LED string, rather than in parallel with the corresponding LED.
- the apparatus comprises a structure similar to the second embodiment for driving a plurality of controllable LED strings interleaved with a plurality of switching units, but in each controllable LED string
- the manner in which the control switch is connected to the corresponding light emitting diode is different from that of the second embodiment.
- Each control switch is connected from the positive terminal of the corresponding LED to the negative terminal of the last controllable LED string of the entire LED illumination device, rather than to the negative terminal of each LED string.
- the apparatus includes a structure for driving a plurality of controllable light emitting diode strings interleaved with a plurality of switching units, similar to the first embodiment, but in each of the controllable light emitting diode strings Inside, a plurality of control switches connected in parallel with corresponding light-emitting diodes are replaced by a plurality of light-emitting diode control circuits.
- each of the light emitting diode control circuits receives an input propagating signal and transmits an output propagating signal.
- the output propagating signal propagates from one LED control circuit to the next LED control circuit within the same controllable LED string.
- the last LED control circuit in each controllable LED string passes the output propagation signal through a forward multiplexer belonging to the controllable LED string to the next controllable LED string.
- the first LED control circuit is a structure for driving a plurality of controllable light emitting diode strings interleaved with a plurality of switching units, similar to the first embodiment, but in
- a voltage range detecting unit for controlling the state of the forward multiplexer and each switching unit in each of the LED strings in the device.
- a voltage comparison unit in the device transmits a forward propagation signal to the first LED control circuit of the first controllable LED string, and sends a plurality of common signals to each of the controllable LED strings.
- Each of the LED control circuits controls the number of LEDs connected in series with each other within each LED string.
- the apparatus includes a structure for driving a plurality of controllable light emitting diode strings interleaved with a plurality of switching units, similar to the fourth embodiment, but in each of the controllable light emitting diode strings
- the manner in which the LED control circuit is connected to the corresponding LED is different from that of the fourth embodiment.
- Each LED control circuit is coupled from the positive terminal of the corresponding LED to the negative terminal of the controllable LED string, rather than in parallel with the corresponding LED.
- each of the LED control circuits receives two input propagation signals, one of which is transmitted from the upper LED control circuit and the other from the lower LED control circuit.
- Each LED control circuit sends an output propagation signal to the upper and lower LED control circuits.
- Each controllable LED string has a forward multiplexer that sends a propagated signal to its trailing controllable LED string, and a reverse multiplexer that sends another propagated signal to it Leading controllable LED string.
- the voltage range detecting unit in the fifth embodiment is for controlling the forward and reverse multiplexers and the states of the respective switching units in the respective LED strings in the device.
- the voltage comparison unit sends a forward propagation signal to the first LED control circuit of the first controllable LED string, and a reverse propagation signal to the last LED control circuit of the last controllable LED string. And send out a number of common signals to each controllable LED
- Each of the LEDs of the string controls the circuitry to control the number of LEDs in series with each other within each LED string.
- the apparatus comprises a structure similar to the fifth embodiment for driving a plurality of controllable LED strings interleaved with a plurality of switching units, but in each controllable light emitting diode In the string, the connection manner of the LED control circuit and the corresponding LED is different from that of the fifth embodiment.
- Each LED control circuit is connected from the positive terminal of the corresponding LED to the negative terminal of the last controllable LED string of the entire LED illumination device, rather than to the negative terminal of the respective LED string.
- the input power supply voltage is supplied to the controllers of the first, second and third embodiments, and the voltage range detecting unit and the voltage comparator unit in the fourth, fifth and sixth embodiments.
- a current source controlled by the controller or voltage range detecting unit connects the negative terminal of the last controllable LED string to the ground. This current source can also be replaced by a resistor.
- FIG. 1A shows a block diagram of a first preferred embodiment of the apparatus of the present invention having a general structure for driving a plurality of LED strings;
- Figure 1B shows a block diagram of an apparatus for replacing the current source of Figure 1A with a resistor
- Figure 2A shows a second preferred embodiment of the apparatus of the present invention having a general structure for driving a plurality of LED strings.
- Figure 2B shows a block diagram of an apparatus in which a resistor is used in place of the current source of Figure 2A;
- Figure 3A shows a third preferred embodiment of the apparatus of the present invention having a general structure for driving a plurality of LED strings.
- Figure 3B shows a block diagram of an apparatus for replacing the current source of Figure 3A with a resistor
- Figures 4A-4C show the controllable LED string of the first, second and third preferred embodiments of the present invention. Individual examples;
- Figure 5 shows an example of a controller in the first, second and third preferred embodiments of the present invention
- Figure 6 shows an example block diagram of the voltage range detecting unit in Figure 5;
- Figure 7A shows a block diagram of a fourth preferred embodiment of the apparatus of the present invention having a general structure for driving a plurality of LED strings
- Figure 7B is a block diagram showing an arrangement of a resistor in place of the current source of Figure 7A
- Figures 8A and 8B are diagrams showing two exemplary blocks of a controllable LED string in a fourth preferred embodiment of the present invention
- Figure 9 shows an example of a light-emitting diode control circuit in a fourth preferred embodiment of the present invention
- Figure 10A shows a block diagram of a fifth preferred embodiment of the apparatus of the present invention having a general structure for driving a plurality of light-emitting diode strings. ;
- Figure 10B is a block diagram showing an arrangement of a resistor in place of the current source of Figure 10A;
- Figure 1A and Figure 1B show two example blocks of a controllable LED string in a fifth preferred embodiment of the present invention.
- Figure 12 is a block diagram showing an example of a light-emitting diode control circuit in a fifth preferred embodiment of the present invention
- Figure 13A is a block diagram showing a sixth preferred embodiment of the apparatus of the present invention having a general structure for driving a plurality of light-emitting diode strings. ;
- Figure 13B is a block diagram showing the arrangement of a resistor in place of the current source of Figure 13A;
- FIGS. 14A and 14B show two example block diagrams of a controllable light emitting diode string in a sixth preferred embodiment of the present invention.
- FIG. 1A is a block diagram showing the apparatus of a first preferred embodiment of the present invention having a general structure for driving a plurality of LED strings.
- the apparatus includes a plurality of controllable LED strings 101 interleaved with a plurality of switching units 112. Each of the switching units 1 1 1 is connected between every two controllable LED strings 101. If the total number of controllable LED strings in the device is N, the total number of switching units is N-1.
- each controllable LED string 101 includes a plurality of LEDs 150 connected in series between the positive and negative ends of the controllable LED string 101, and each of the LEDs Tube 150 has a corresponding control switch 151.
- Each switching unit 111 includes two parallel switches 117 and 118, and a series switch 119.
- a controller 140 is used to control the plurality of controllable LED strings 101 and the plurality of switching units 111. Each control switch 151 is controlled by a control signal transmitted from the controller 140. The controller 140 also transmits a parallel connection signal (P) and a series connection signal (S) to each of the switching units 111. The input voltage V IN provides power to the device. Current source 130 connects the negative terminal of the last controllable LED string to ground. Current source 130 is also controlled by controller 140.
- each of the light-emitting diodes 150 in the controllable LED string 101 has a corresponding control switch 151 connected in parallel with the light-emitting diode 150.
- each of the light emitting diodes 150 can be controlled via a control signal sent by the controller 140 and individually shorted so that the total number of light emitting diodes 150 connected in series within each of the controllable light emitting diode strings 101 can be controlled.
- each switching unit 111 has a leading controllable LED string and a trailing controllable LED string.
- Each switching unit 111 can be controlled to connect its leading controllable LED string and the trailing controllable LED string to form a parallel or series connection, or to short the leading controllable LED string.
- two parallel switches 117 and 118 are turned on, and the series switch 119 is turned off, and the positive and negative ends of two adjacent controllable LED strings can be respectively connected, so that two adjacent controllable The LED strings are connected in parallel.
- the two parallel switches 117 and 118 are turned off and the series switch 119 is turned on, and the adjacent two controllable light emitting diode strings are connected in series.
- the leading controllable light-emitting diode string can be short-circuited. In other words, the leading controllable LED string is bypassed.
- the controller 140 controls the switching unit 111 by using the parallel connection signal and the series connection signal to change the state of each switching unit 111, and adjusts the current source 130 through a plurality of according to the voltage level of the input voltage V IN .
- the current of the LED string 101 can be controlled.
- controller 140 also uses control signals to control the number of light-emitting diodes connected in series within each controllable light-emitting diode string 101 for each particular voltage range of input voltage V IN . For example, assume that the device of Figure 1A is designed to operate at different input voltages V P V 2 , ..., and 1 ⁇ , where V 1 ⁇ V 2 ⁇ ... ⁇ V K .
- each of the controllable LED strings is designed to withstand a maximum voltage of V, and the total number of LED strings 101 can be controlled, which can be designed as v x /v P where ⁇ is, v 2 , ..., the common multiple of ⁇ ⁇ .
- a plurality of controllable LED strings 101 can be controlled by the controller 140, and each V x /V n controllable LEDs are connected in parallel and then form V n /V.
- the group of LED strings are connected in series with each other. If the current of current source 130 is controlled to (V x /V n ) *1, where I is a general drive current that can control the string of LEDs, then the device can drive a plurality of controllable LED strings at different inputs. The same brightness is provided at voltages v P v 2 , ..., and v k .
- all six controllable LED strings are connected in parallel.
- the device can be designed to have a total of N ⁇ 2 controllable LED strings, and each controllable LED string can withstand the maximum The voltage is V k /N.
- V K /N When the device has an input voltage greater than n* (V K /N), where 0 ⁇ n ⁇ N, at least (n+1) controllable LED strings must be connected in series, while other controllable illumination
- the diode strings can be short-circuited or connected in parallel.
- the device can be designed to contain two controllable LED strings, each of which can withstand a maximum voltage of 120V.
- FIG. 1A current source 130 can be replaced by a resistor.
- FIG. 1B shows a block diagram in which a resistor 131 is substituted for current source 130. Since the current flowing through the resistor 131 is uncontrollable, the controller 141 of the device in Fig. 1B can be connected in parallel. The signal and the series connection signal are used to control the switching unit 1 1 1 to change the state of each switching unit 11 1 according to the voltage level of the input voltage v 1N , but the current flowing through the resistor 131 cannot be adjusted.
- FIG. 2A shows a block diagram of an apparatus having a general structure for driving a plurality of LED strings in accordance with a second preferred embodiment of the present invention.
- the apparatus includes a plurality of controllable light emitting diode strings 201 interleaved with a plurality of switching units 21 1 .
- Each of the switching units 21 1 is connected between every two controllable light emitting diode strings 201. If the total number of controllable LED strings in the device is N, the total number of switching units is N-1.
- each of the light-emitting diodes 150 has a corresponding control switch 151 in parallel with the light-emitting diodes 150 in the controllable light-emitting diode string 101.
- each of the light emitting diodes 250 also has a corresponding control switch 251.
- the control switch 251 is connected from the positive terminal of the corresponding LED 250 to the negative terminal of the controllable LED string 201.
- each of the control switches 251, in each of the controllable LED strings 201 have a common terminal coupled to the negative terminal of the controllable LED string 201. Therefore, each of the light emitting diodes 250 cannot be independently controlled. For example, if the control signal from the controller 240 is turned on, the uppermost control switch 251 in the controllable LED string 201 is turned on, and all of the light-emitting diodes in the controllable LED string 20 are short-circuited.
- the controller 240 in the second embodiment also controls the switching unit 21 1 by using the parallel connection signal and the series connection signal to change the state of each switching unit 21 1 and according to the voltage of the input voltage V IN High or low, to adjust the current source 230 through a plurality of currents that can control the LED string 201.
- controller 240 also uses control signals to control the number of light emitting diodes connected in series within each controllable LED string 201 for each particular voltage range of input voltage V IN .
- FIG. 2B Similar to FIG. 1B, the current source 130 of FIG. 1A is replaced with a resistor 131, which is a variation from FIG. 2A, with the resistor 231 replacing the current source 230 of FIG. 2A.
- the controller 241 of the apparatus in FIG. 2B can control the switching unit 21 1 using the parallel connection signal and the series connection signal to change the state of each switching unit 21 1 according to the voltage level of the input voltage V IN , but cannot The current flowing through the resistor 231 is adjusted.
- Figure 3A shows a block diagram of an apparatus having a general structure for driving a plurality of LED strings in accordance with a third preferred embodiment of the present invention.
- the apparatus includes a plurality of controllable light emitting diode strings 301 interleaved with a plurality of switching units 31 1 .
- Each of the switching units 31 1 is connected between every two controllable LED strings 301. If the total number of controllable LED strings in the device is N, the total number of switching units is N1.
- the apparatus shown in the third embodiment is almost the same as the apparatus shown in the second embodiment of Fig. 2A except that the light-emitting diode string 301 can be controlled.
- the control gates 251 corresponding to each of the light-emitting diodes 250 in the controllable light-emitting diode string 201 have a common terminal connected to the negative terminal of the controllable light-emitting diode string 201.
- a common terminal of each control switch 351 is the negative terminal of the last controllable LED string 301 that is connected to the entire device. Therefore, each of the light emitting diodes 350 cannot be independently controlled.
- the uppermost control switch 351 in the leftmost controllable light emitting diode string 301 is turned on, and all of the light emitting diodes in the entire device are short-circuited.
- the controller 340 in the third embodiment also controls the switching unit 311 to change the state of each switching unit 311 by using the parallel connection signal and the series connection signal, and according to the voltage level of the input voltage V 1N .
- the current source 330 is adjusted to pass current through a plurality of controllable LED strings 301.
- controller 340 also uses control signals to control the number of light emitting diodes connected in series within each controllable LED string 301 for each particular voltage range of input voltage V IN .
- the current source 230 of Fig. 2A is replaced with a resistor 231, which is a variation from Fig. 3A, with the resistor 331 replacing the current source 330 of Fig. 3A.
- the controller 341 of the apparatus in FIG. 3B can control the switching unit 31 1 using the parallel connection signal and the series connection signal, and change the state of each switching unit 31 1 according to the voltage level of the input voltage V IN , but cannot The current flowing through the resistor 331 is adjusted.
- FIG. 4A shows that in the controllable LED string of the first embodiment, a resistor and a light source may be further included. The diodes are connected in series.
- Figure 4B also shows that in the second embodiment, a resistor is connected in series with the LEDs in the controllable LED string.
- each of the controllable light emitting diode strings of the third embodiment is shown connected to a resistor. The resistors in these examples are optional.
- FIG. 5 shows a block diagram of a controller of the apparatus according to the first, second and third embodiments of the present invention.
- the controller includes an analog/digital (A/D) converter 501, a state machine 502, a control logic unit 503 implemented in a logic circuit or a memory, and a voltage range detecting unit 504.
- the analog/digital converter 501 converts the input voltage V 1N and outputs a digital signal to the state machine 502.
- the voltage range detecting unit 504 also outputs a control signal to the state machine 502 of the master control logic unit 503 to output a control signal to each of the controllable LED strings.
- the voltage range detecting unit 504 transmits the parallel connection signal and the series connection signal to a plurality of switching units. If a current source is used in the device, voltage range detection unit 504 is also coupled to the current source to control the current of the current source. If a resistor is used in the device in place of the current source, the state machine 502 receives a current sense signal from the resistor.
- Fig. 6 shows an example of a block diagram of a voltage range detecting unit including a plurality of voltage comparators 601 for detecting a voltage range of the input voltage V 1N .
- a control logic unit 602 consisting of a logic circuit or a memory, provides a parallel connection signal and a series connection signal to a plurality of switching units.
- a reference voltage generator 603, driven by control logic unit 602, provides a control signal to control the current through the current source.
- Figure 7A shows a block diagram of an apparatus having a general structure for driving a plurality of LED strings in accordance with a fourth preferred embodiment of the present invention.
- the apparatus includes a plurality of controllable light emitting diode strings 701 interleaved with a plurality of switching units 71 1 .
- Each of the switching units 71 1 is connected between every two controllable light emitting diode strings 701. If the total number of controllable LED strings in the device is N, the total number of switching units is N-1.
- each of the controllable LED strings 701 includes a plurality of light emitting diodes 750 connected in series between the positive and negative ends of the controllable LED string 701, and each of the LEDs 750 has a corresponding one.
- each controllable LED string 701 includes a forward multiplexer 760 for delivering a propagated signal 761 to the next controllable LED string.
- Each switching unit 71 1 includes two parallel switches 717 and 718, and a series switch 719.
- a voltage range detecting unit 740 controls the plurality of switching units 71 1 .
- the voltage range detecting unit 740 also transmits a parallel connection signal (P) and a series connection signal (S) to each switching unit 71 1 .
- the input voltage V IN provides power to the device.
- Current source 730 connects the negative terminal of the last controllable LED string to ground. Current source 730 is also controlled by voltage range detection unit 740.
- the apparatus further includes a switching voltage comparison unit 780 that transmits a common signal 785 to each of the LED control circuits 751.
- each LED control circuit 751 receives an input propagation signal 752 and an output propagation signal 753 to the next LED control circuit.
- a first LED control circuit in parallel with the uppermost one of the leftmost controllable LED strings receives a forward propagation signal 781 from the switching voltage comparison unit 780.
- the output transmission signal 753 is propagated from the first LED control circuit to the next LED control circuit, and then an output transmission signal is propagated to the next LED control circuit, and so on.
- the forward multiplexer 760 in the leftmost controllable LED string receives the forward propagation signal 781 transmitted from the switching voltage comparison unit 780, and the most leftmost controllable LED string.
- the lower LED control circuit outputs a transmission signal 753 and transmits a propagation signal 761 to the uppermost LED control circuit of the second leftmost controllable LED string.
- the voltage range detecting unit 740 also sends a forward selection signal 747 to each of the controllable LED strings 701 to select and control the forward multiplexer 760 in each of the controllable LED strings for transmission.
- a propagation signal 761 acts as a propagation signal for the input of the LED control circuit corresponding to the uppermost LED within the next controllable LED string.
- the voltage range detecting unit 740 controls the switching unit 71 1 by using the parallel connection signal and the series connection signal to change the state of each switching unit 71 1 and adjust the current source according to the voltage level of the input voltage V 1N . 730 passes through a plurality of currents that control the LED string 701.
- FIG. 7A shows a block diagram in which a resistor 731 is substituted for current source 730. Since the current flowing through the resistor 731 is uncontrollable, the voltage range detecting unit 741 of the apparatus in FIG. 7B can control the switching unit 71 1, using the parallel connection signal and the series connection signal, according to the input voltage V IN The voltage is high or low to change the state of each switching unit 71 1 , but the current flowing through the resistor 731 cannot be adjusted.
- each of the light-emitting diodes within the controllable LED string 701 has a corresponding light-emitting diode, but in some applications, controllable illumination At least one of the LEDs in the diode string 701 must be bright, so that the uppermost one of the LED control circuits 751 can be dispensed with.
- the propagation signal sent from the switching voltage comparison unit 780 or the forward multiplexer 760 is directly transmitted to the light-emitting diode control circuit corresponding to the second light-emitting diode.
- the switching voltage comparison unit 780 transmits several common signals 785 to each of the LED control circuits 751. These common signals 785 include a reset signal, an up/down signal, and a sync signal.
- the reset signal resets all of the LED control circuit 751 to their initial state
- the up/down signal indicates that the input voltage V 1N is increasing or decreasing
- the synchronization signal enables all of the LED control circuits 751 to be switched synchronously.
- the switching voltage comparison unit 780 includes a voltage comparator for generating a common signal 785 based on the input voltage V IN .
- FIGS 8A and 8B are block diagrams showing two examples of controllable LED strings in the apparatus of the fourth embodiment.
- the circuit shown in Figure 8A is the same as the controllable LED string shown in Figures 7A and 7B, and Figure 8B shows the LED string in the controllable LED string in series with a resistor.
- Fig. 9 shows an example of a circuit of the light emitting diode control circuit 751 of the fourth preferred embodiment of the present invention. Under the control of the switching voltage comparison unit 780, each of the LED control circuits 751 can short-circuit the corresponding LEDs. In accordance with the present invention, the LED control circuitry at each of the controllable light emitting diode strings can be different.
- FIG 10A shows a block diagram of an apparatus having a general structure for driving a plurality of LED strings in accordance with a fifth preferred embodiment of the present invention.
- the apparatus includes a plurality of controllable light emitting diode strings 1001 interleaved with a plurality of switching units 101 1 .
- Each of the switching units 101 1 is connected between every two controllable light emitting diode strings 1001. If the total number of controllable LED strings in the device is N, the total number of switching units is N-1.
- each of the controllable light emitting diode strings 1001 includes a plurality of light emitting diodes 1050 connected in series between the positive and negative ends of the controllable light emitting diode string 1001, and each of the light emitting diodes 1050 has a corresponding one.
- LED control circuit 1051 but the LED The tube control circuit 1051 is connected from the positive terminal of the corresponding light emitting diode 1050 to the negative terminal of the controllable light emitting diode string 1001 instead of being in parallel with the corresponding light emitting diode 1050.
- each controllable LED string 1001 includes a forward multiplexer 1060 that transmits a propagated signal 1061 to a next controllable LED string, and one transmits another propagated signal 1071 to The former is an inverse multiplexer 1070 that controls the string of LEDs.
- Each switching unit 101 1 also includes two parallel switches 1017 and 1018, and a series switch 1019.
- a voltage range detecting unit 1040 controls the plurality of switching units 101 1 .
- the voltage range detecting unit 1040 also transmits a parallel connection signal (P) and a series connection signal (S) to each switching unit 101 1 .
- the input voltage V 1N provides power to the device.
- Current source 1030 connects the negative terminal of the last controllable LED string to ground. Current source 1030 is also controlled by voltage range detecting unit 1040.
- the apparatus further includes a switching voltage comparison unit 1080 that transmits a common signal 1085 to each of the light emitting diode control circuits 1051.
- a switching voltage comparison unit 1080 that transmits a common signal 1085 to each of the light emitting diode control circuits 1051.
- each LED control circuit 1051 receives an input from the previous LED control circuit. The propagation signal, and the other input propagation signal from the next LED control circuit, and send an output propagation signal to the upper and lower LED control circuits.
- the first (uppermost) LED control circuit of the uppermost LED is connected in parallel in the leftmost controllable LED string, and the forward propagation signal 1081 is received from the switching voltage comparison unit 1080.
- each of the first (uppermost) LED control circuits within the controllable LED string receives a forward multiplexer of its controllable LED string The propagated signal 1061 transmitted by 1060.
- the last (lowest) LED control circuit of the lowest-level LED in parallel in the rightmost controllable LED string receives the backpropagation signal 1082 from the switching voltage comparison unit 1080.
- each of the last (lowest) LED control circuits within the controllable LED string receives an inverted multiplexer of its controllable LED string 1070 Transmitted signal 1071.
- an inverse multiplexer 1070 within each controllable LED string receives the propagated signal transmitted from the uppermost LED control circuit, and The right one controls the propagated signal 1071 transmitted by the LED string and then outputs another propagated signal 1071 to a left controllable LED string.
- a forward multiplexer 1060 within each controllable LED string receives the propagated signal transmitted from the lowest LED control circuit. And a propagated signal 1061 transmitted from a left controllable LED string, and then another propagated signal 1061 to a right controllable LED string.
- the voltage range detecting unit 1040 controls the switching unit 101 1 by using the parallel connection signal and the series connection signal to change the state of each switching unit 101 1 and according to the input voltage V IN
- the voltage level is adjusted to regulate the current of the current source 1030 through a plurality of controllable LED strings 1001.
- the voltage range detecting unit 1040 also sends a forward selection signal 1047 and a reverse selection signal 1048 to each controllable LED string 1001 to select and control forward multiplexing of each controllable LED string, respectively.
- the device 1060 and the inverse multiplexer 1070 are examples of the voltage range detecting unit 1040.
- the current source 730 of Fig. 7A is replaced with a resistor 731, which is a variation from Fig. 10A, with the resistor 1031 replacing the current source 1030 of Fig. 10A.
- the voltage range detecting unit 1041 of the apparatus in FIG. 10B can control the switching unit 101 1 using the parallel connection signal and the series connection signal, and change the state of each switching unit 101 1 according to the voltage level of the input voltage V 1N .
- the current flowing through the resistor 1031 cannot be adjusted.
- each of the light-emitting diodes in the controllable light-emitting diode string 1001 has a corresponding light-emitting diode, but in some applications, the light-emitting diode string can be controlled. At least one of the LEDs in 1001 must be bright, so that the first LED control circuit 1051 at the top can be dispensed with.
- the switching voltage comparison unit 1080 transmits several common signals 1085 to each of the light emitting diode control circuits 1051. These common signals 1085 include a reset signal, an up/down signal, and a sync signal. The reset signal resets all of the LED control circuits 1051 to their initial state. The up/down signal indicates that the input voltage V IN is increasing or decreasing, and the synchronization signal enables all of the LED control circuits 1051 to be switched synchronously.
- the switching voltage comparison unit 1080 includes a voltage comparator for generating a common signal 1085 based on the input voltage V IN .
- 1A and 1B show block diagrams of two examples of controllable LED strings in the apparatus of the fifth embodiment. The circuit shown in Fig. 1A is the same as the controllable LED string of Figs. 10A and 10B, and Fig. 11B shows that the LED string in the controllable LED string is in series with a resistor.
- the switching voltage comparison unit 1080 controls each of the light emitting diode control circuits
- Each LED control circuit can short-circuit one or more of the LEDs within the controllable LED string. For example, in the uppermost LED control circuit, all of the LEDs in the controllable LED string 1001 can be short-circuited, but in the lower LED control circuit, the controllable LED string 1001 can only be used. The lowermost LED inside is short-circuited.
- the LED control circuitry within the controllable LED string can be different.
- Fig. 12 shows an example of the light emitting diode control circuit 1051.
- Figure 13A shows a block diagram of an apparatus having a general structure for driving a plurality of LED strings in accordance with a sixth preferred embodiment of the present invention.
- the apparatus includes a plurality of controllable light emitting diode strings 1301 interleaved with a plurality of switching units 131 1 .
- Each of the switching units 131 1 is connected between every two controllable light emitting diode strings 1301. If the total number of controllable LED strings in the device is N, the total number of switching units is N-1.
- the apparatus shown in the sixth embodiment is almost the same as the apparatus shown in the fifth embodiment of Fig. 10A except that the light-emitting diode string 1301 can be controlled.
- the control switch 1051 corresponding to each of the light-emitting diodes 1050 in the controllable light-emitting diode string 1001 has a common terminal connected to the negative terminal of the controllable light-emitting diode string 1001.
- a common terminal of each of the LED control circuits 1351 is the negative terminal of the last controllable LED string 1301 connected to the entire apparatus.
- the voltage range detecting unit 1340 controls the switching unit 131 1 by using the parallel connection signal and the series connection signal to change the state of each switching unit 1311, and according to the voltage of the input voltage V IN High and low, to adjust the current source 1330 through a plurality of current controllable LED string 1301 current.
- the current source 1030 of Fig. 10A is replaced with a resistor 1031, and Fig. 13B is changed from Fig. 13A, replacing the current source 1330 of Fig. 10A with a resistor 1331.
- the voltage range detecting unit 1341 of the apparatus in FIG. 13B can use the parallel connection signal.
- the switching unit 131 is connected to the series connection signal to change the state of each switching unit 131 1 according to the voltage level of the input voltage V IN , but the current flowing through the resistor 1331 cannot be adjusted.
- FIGS. 14A and 14B are block diagrams showing two examples of controllable LED strings in the apparatus of the sixth embodiment.
- the circuit shown in FIG. 14A is the same as the controllable LED string of FIGS. 13A and 13B, and FIG. 14B shows the LED string and each LED control circuit in the controllable LED string, one by one.
- the resistors are connected in series.
- the light-emitting diode control circuit 1351 in the sixth embodiment of the present invention is the same as the light-emitting diode control circuit 1051 in the fifth embodiment shown in FIG.
- the light-emitting diodes in each of the controllable light-emitting diode strings are generally referred to as all types of light-emitting diodes, such as general semiconductor light-emitting diodes and organic light-emitting diodes, which may emit light in various spectrums.
- each control switch or LED control circuit is described as corresponding to a light emitting diode within a controllable LED string, such a light emitting diode, It can also be a lighting unit comprising one light-emitting diode of a plurality of light-emitting diodes.
- a parallel or series switch in a switching unit is also generally meant to include a switch assembly that can properly turn a circuit on or off.
- the switch assembly can be mechanical or electrical, or can be a semiconductor switch assembly fabricated from an integrated circuit.
- the present invention provides a novel general structure for driving a plurality of controllable light emitting diode strings. Via a plurality of switching units interleaved with a plurality of controllable LED strings, two adjacent LED strings can be connected in parallel or in series, or short-circuited by a leading LED string.
- a control switch corresponding to each of the light-emitting diodes in the controllable LED string, or a light-emitting diode control circuit can be flexibly adjusted according to the input voltage, and the light-emitting diodes connected in series in each controllable LED string can be flexibly adjusted according to the input voltage. Number of.
- the present invention provides a novel method and apparatus for controlling how LED strings are connected in series and in parallel, and controlling how many LEDs are connected in series in each LED string.
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Abstract
The device comprises multiple controllable light-emitting diode (LED) strings and multiple switching units in zigzag connections, wherein each switching unit is connected between a leading controllable LED string and a trailing controllable LED string. Under the control of a controller, each switching unit can connect the leading and trailing controllable LED strings thereof in series or parallel, or enable the leading controllable LED string thereof to be in short circuit, thereby enabling the multiple controllable LED strings to form various combinations connected in series or parallel according to the range of automatically detected input voltages. Each controllable LED string comprises a plurality of LEDs connected between a positive terminal and a negative terminal thereof and a plurality of control switches, wherein each control switch corresponds to one LED, the controller controls these control switches, and when the input voltage changes over time, the number of LEDs which are mutually connected in series in each LED string is adjusted by utilizing the on-state or off-state of the control switches.
Description
具有驱动多数个发光二极管串的通用结构的装置 技术领域 Device having a universal structure for driving a plurality of LED strings
本发明涉及发光二极管的照明装置, 尤其是一种用于驱动多数个可控制 发光二极管串的装置。 背景技术 The present invention relates to illumination devices for light emitting diodes, and more particularly to a device for driving a plurality of controllable LED strings. Background technique
发光二极管 (LED) 是一种基于半导体的光源, 经常被应用在低耗电仪 表和家电的指示器,应用发光二极管在各种照明装置也已越来越普遍。例如, 高明亮度的发光二极管已被广泛用于交通信号灯,车辆指示灯, 以及剎车灯。 Light-emitting diodes (LEDs) are semiconductor-based light sources that are often used in low-energy meters and appliances, and the use of light-emitting diodes in various lighting devices has become more common. For example, high-brightness LEDs have been widely used in traffic lights, vehicle lights, and brake lights.
发光二极管的电流对电压 (IV) 特性曲线类似于一般的普通二极管, 当 加于发光二极管的电压小于二极管的正向电压时, 只有非常小的电流通过发 光二极管。 当电压超过正向电压时, 通过发光二极管的电流则大幅增加。一 般来说, 在大多数操作范围, 基于发光二极管的照明装置的发光强度是和通 过的电流成正比, 但操作在高电流时则不如此。 通常为基于发光二极管的照 明装置设计的驱动装置, 都是以提供一个恒定的电流为主, 以便能发出稳定 的光和延长发光二极管的寿命。 The current-to-voltage (IV) characteristic curve of the LED is similar to that of a normal diode. When the voltage applied to the LED is less than the forward voltage of the diode, only a very small current flows through the LED. When the voltage exceeds the forward voltage, the current through the LED is greatly increased. In general, in most operating ranges, the illumination intensity of an LED-based illumination device is proportional to the current passed, but not at high currents. Drives typically designed for light-emitting diode-based lighting devices are designed to provide a constant current to provide stable light and extend the life of the LED.
为了提高基于发光二极管的照明装置的亮度, 通常是将多数个发光二极 管串联在一起, 形成一个基于发光二极管的照明单位, 而且多数个基于发光 二极管的照明单位可以更进一步串联在一起, 形成一个照明装置。 例如, 美 国专利 6777891号揭露将多数个基于发光二极管的照明单位, 形成一个可由 计算机控制的灯串, 其中每个照明单位在灯串里形成一个可单独控制的节 点。 In order to increase the brightness of the LED-based illumination device, a plurality of LEDs are usually connected in series to form an LED-based illumination unit, and most of the LED-based illumination units can be further connected in series to form an illumination. Device. For example, U.S. Patent No. 6,777,891 discloses a plurality of LED-based illumination units forming a computer-controlled string of lights, each of which forms a separately controllable node in the string.
每个照明装置所需要的工作电压, 通常是取决于照明单位里的发光二极 管的正向电压, 每个照明单位里有多少个发光二极管, 每个照明单位是如何 相互接联的, 以及每个照明单位在照明装置里,是如何接收来自电源的电压。 因此, 在大多数的应用中, 都需要某种类型的电源电压转换装置, 来将一般 较普遍的高电压电源, 转换成较低的电压, 以提供给一个或多数个基于发光 二极管的照明单位。 因为需要这样的一个电压转换装置, 造成基于发光二极 管的照明设备效率减低, 成本增高, 也难以减小其体积。
美国专利 7781979号提供了一个控制串联的发光二极管的装置。 其中有 两个或两个以上的发光二极管串联连接, 当施加电压时, 一串联的电流即流 经发光二极管。 其中至少有一个发光二极管被并联一个或多数个可控制的电 流路径, 来使串联的电流部分流经这些可控制的电流路径, 以便不需要电压 转换装置即可使用一般较普遍的高电压电源。 因此该装置可使用如 120V或 240V的交流电压。 The operating voltage required for each illuminator is usually determined by the forward voltage of the LEDs in the lighting unit, how many LEDs are in each lighting unit, how each lighting unit is connected to each other, and each The lighting unit is in the lighting device, how it receives the voltage from the power supply. Therefore, in most applications, some type of supply voltage conversion device is required to convert a generally more common high voltage power supply to a lower voltage to provide one or more LED-based lighting units. . Because such a voltage conversion device is required, the efficiency of the LED-based lighting device is reduced, the cost is increased, and it is difficult to reduce its volume. U.S. Patent No. 778,1979 provides a device for controlling a series of light emitting diodes. Two or more of the light emitting diodes are connected in series, and when a voltage is applied, a series current flows through the light emitting diode. At least one of the light emitting diodes is connected in parallel with one or more controllable current paths to cause a series current to flow through the controllable current paths so that a generally more common high voltage power supply can be used without the need for a voltage conversion device. Therefore, the device can use an alternating voltage such as 120V or 240V.
美国专利公告 2010/0308739号揭露了将多数个发光二极管互接串联成 多数个发光二极管段的装置, 以及多数个开关器与此多数个发光二极管段互 接, 来选取控制某一发光二极管段, 将其从一个发光二极管串联电流通路中 串联接入或切隔分出。 US Patent Publication No. 2010/0308739 discloses a device in which a plurality of light emitting diodes are connected in series to form a plurality of LED segments, and a plurality of switches are connected to the plurality of LED segments to select and control a certain LED segment. It is connected in series or separated from one LED series current path.
在传统的不用电压转换器的驱动发光二极管电路中, 当输入电压变高 时, 就必须串联较多的发光二极管。 但是如果驱动多数个发光二极管段的装 置的方法, 只靠改变串联的发光二极管的数量来调适不同大小的输入电压, 那么当输入电压变低时, 发光二极管的使用率就变的非常低。 In a conventional driving LED circuit that does not use a voltage converter, when the input voltage becomes high, more LEDs must be connected in series. However, if the method of driving a plurality of LED segments is to adjust the input voltages of different sizes by merely changing the number of LEDs connected in series, the usage of the LEDs becomes very low when the input voltage becomes low.
美国专利公告 201 1/0085619号,揭露了一用于驱动多数个不同长度的发 光二极管串的选择电路, 以根据相对应的输入交流电压, 将某些发光二极管 串选择性的打开或关闭。美国专利公告 2012/0217887号,揭露了可以在交流 电源的电压变化下, 提供平均的发光强度的发光二极管的照明装置和控制方 法。 U.S. Patent Publication No. 201 1/0085619 discloses a selection circuit for driving a plurality of different lengths of light emitting diode strings to selectively turn on or off certain light emitting diode strings in accordance with corresponding input AC voltages. U.S. Patent Publication No. 2012/0217887 discloses an illumination device and control method for a light-emitting diode that provides an average luminous intensity under varying voltages of an alternating current source.
因为已有越来越多的基于发光二极管的照明单位被应用在高亮度的照 明设备上, 如何使用墙上现有的交流电源, 灵活和有效地提高发光二极管的 使用率, 并提供稳定性和高亮度, 来驱动和连接多数个基于发光二极管的照 明单位的设计方法和装置, 已经形成一种不可或缺的需求。 此外, 如何控制 连接在一起的基于发光二极管的照明单位, 使照明亮度可以根据不同的照明 要求, 或交流电源电压的变化, 来提供不同的照明模式, 也是非常重要的。 发明内容 Because more and more LED-based lighting units are used in high-brightness lighting, how to use the existing AC power on the wall, flexibly and effectively increase the use of LEDs, and provide stability and High brightness, design methods and devices for driving and connecting many LED-based lighting units have become an indispensable requirement. In addition, it is important to control the LED-based lighting units that are connected together so that the lighting brightness can provide different lighting modes depending on different lighting requirements or changes in the AC power supply voltage. Summary of the invention
本发明提供一种能适应在不同的输入交流电源的不同的电压下, 有效率 的驱动发光二极管照明装置。 本发明提供的发光二极管照明装置, 有一个可 以随着自动侦测到的输入电压的范围, 而将多数个可控制发光二极管串之间
以串联, 并联或短路方式相接的通用结构。 除此之外, 在每一可控制发光二 极管串之内串联的发光二极管的数量, 更可依据输入电压随时间的变化而调 整。 The present invention provides an efficient illumination LED lighting device that can accommodate different voltages of different input AC power sources. The LED lighting device provided by the invention has a range of input voltages that can be automatically detected, and a plurality of controllable LED strings are connected between A common structure that is connected in series, parallel or short circuit. In addition, the number of light-emitting diodes connected in series within each controllable LED string can be adjusted according to the change of the input voltage with time.
在本发明的第一优选实施例中, 该装置包括多数个可控制发光二极管串 与多数个切换单元交错连接, 每个切换单元连接一领先的可控制发光二极管 串和一尾随的可控制发光二极管串。 每个可控制发光二极管串, 包含有连接 在其正端和负端之间的多数个发光二极管, 和多数个控制开关, 其中每个控 制开关相对应于一个发光二极管。 In a first preferred embodiment of the present invention, the apparatus includes a plurality of controllable LED strings interleaved with a plurality of switching units, each switching unit being coupled to a leading controllable LED string and a trailing controllable LED string. Each controllable LED string includes a plurality of light emitting diodes connected between its positive and negative terminals, and a plurality of control switches, each of which corresponds to a light emitting diode.
在一控制器的控制之下, 各切换单元的操作状态可被控制, 使该切换单 元将其领先和尾随的可控制发光二极管串形成串联或并联, 或将其领先的可 控制发光二极管串短路。 在本实施例中, 每个控制开关与其相对应的一个发 光二极管互相并联, 而上述的控制器则输出控制信号来控制这些控制幵关, 利用控制开关的开或关, 以调整在发光二极管串内互相串联的发光二极管数 目。 Under the control of a controller, the operating state of each switching unit can be controlled such that the switching unit forms its leading and trailing controllable LED strings in series or in parallel, or shorts its leading controllable LED string . In this embodiment, each control switch and its corresponding one of the light emitting diodes are connected in parallel with each other, and the above controller outputs a control signal to control the control, and the control switch is turned on or off to adjust the LED string. The number of light-emitting diodes connected in series with each other.
在本发明的第二优选实施例中, 该装置包括与第一实施例类似, 用于驱 动与多数个切换单元交错的多数个可控制发光二极管串的结构, 但在每个可 控制发光二极管串内, 控制开关与相对应的发光二极管的连接方式, 和第一 实施例不同。 每个控制幵关从相对应的发光二极管的正极端, 连接到该可控 制发光二极管串的负端, 而不是与相应的发光二极管并联。 In a second preferred embodiment of the invention, the apparatus comprises a structure for driving a plurality of controllable LED strings interleaved with a plurality of switching units, similar to the first embodiment, but in each of the controllable LED strings The manner in which the control switch is connected to the corresponding light emitting diode is different from that of the first embodiment. Each control is connected from the positive terminal of the corresponding LED to the negative terminal of the controllable LED string, rather than in parallel with the corresponding LED.
在本发明的第三优选实施例中, 该装置包括与第二实施例类似, 用于驱 动与多数个切换单元交错的多数个可控制发光二极管串的结构, 但在每个可 控制发光二极管串内, 控制开关与相对应的发光二极管的连接方式, 和第二 实施例不同。 每个控制开关从相对应的发光二极管的正极端, 连接到整个发 光二极管照明装置的最后一个可控制发光二极管串的负端, 而不是连接到各 别的发光二极管串的负端。 In a third preferred embodiment of the invention, the apparatus comprises a structure similar to the second embodiment for driving a plurality of controllable LED strings interleaved with a plurality of switching units, but in each controllable LED string The manner in which the control switch is connected to the corresponding light emitting diode is different from that of the second embodiment. Each control switch is connected from the positive terminal of the corresponding LED to the negative terminal of the last controllable LED string of the entire LED illumination device, rather than to the negative terminal of each LED string.
在本发明的第四优选实施例中, 该装置包括与第一实施例类似, 用于驱 动与多数个切换单元交错的多数个可控制发光二极管串的结构, 但在每个可 控制发光二极管串内, 与相对应的发光二极管并联连接的多数个控制开关, 由多数个发光二极管控制电路所取代。
在第四实施例中, 每个发光二极管控制电路接收到一个输入的传播信 号, 并发送出一个输出的传播信号。 输出的传播信号, 在同一个可控制发光 二极管串内, 从一个发光二极管控制电路传播到下一个发光二极管控制电 路。 在每个可控制发光二极管串内的最后一个发光二极管控制电路, 则将输 出的传播信号经过属于该可控制发光二极管串的一个正向多路转换器, 传播 到下一个可控制发光二极管串的第一个发光二极管控制电路。 In a fourth preferred embodiment of the present invention, the apparatus includes a structure for driving a plurality of controllable light emitting diode strings interleaved with a plurality of switching units, similar to the first embodiment, but in each of the controllable light emitting diode strings Inside, a plurality of control switches connected in parallel with corresponding light-emitting diodes are replaced by a plurality of light-emitting diode control circuits. In the fourth embodiment, each of the light emitting diode control circuits receives an input propagating signal and transmits an output propagating signal. The output propagating signal propagates from one LED control circuit to the next LED control circuit within the same controllable LED string. The last LED control circuit in each controllable LED string passes the output propagation signal through a forward multiplexer belonging to the controllable LED string to the next controllable LED string. The first LED control circuit.
第四实施例中, 有一电压范围检测单元, 用来控制在该装置中的各发光 二极管串内的正向多路转换器以及各切换单元的状态。 该装置中的一个电压 比较单元则发送出一个正向传播信号, 到第一个可控制发光二极管串的第一 个发光二极管控制电路, 并发送出多数个共同信号给每个可控制发光二极管 串的每个发光二极管控制电路, 以便控制在每个发光二极管串内互相串联的 发光二极管数目。 In the fourth embodiment, there is a voltage range detecting unit for controlling the state of the forward multiplexer and each switching unit in each of the LED strings in the device. A voltage comparison unit in the device transmits a forward propagation signal to the first LED control circuit of the first controllable LED string, and sends a plurality of common signals to each of the controllable LED strings. Each of the LED control circuits controls the number of LEDs connected in series with each other within each LED string.
在本发明的第五优选实施例中, 该装置包括与第四实施例类似, 用于驱 动与多数个切换单元交错的多数个可控制发光二极管串的结构, 但在每个可 控制发光二极管串内, 发光二极管控制电路与相对应的发光二极管的连接方 式, 和第四实施例不同。 每个发光二极管控制电路从相对应的发光二极管的 正极端, 连接到该可控制发光二极管串的负端, 而不是与相应的发光二极管 并联。 In a fifth preferred embodiment of the present invention, the apparatus includes a structure for driving a plurality of controllable light emitting diode strings interleaved with a plurality of switching units, similar to the fourth embodiment, but in each of the controllable light emitting diode strings The manner in which the LED control circuit is connected to the corresponding LED is different from that of the fourth embodiment. Each LED control circuit is coupled from the positive terminal of the corresponding LED to the negative terminal of the controllable LED string, rather than in parallel with the corresponding LED.
在第五实施例中, 每个发光二极管控制电路接收两个输入传播信号, 其 中一个是从上面的发光二极管控制电路传来, 而另一个则是从下面的发光二 极管控制电路传来。 每个发光二极管控制电路发送出一个输出传播信号, 到 上面和下面的两个发光二极管控制电路。 每一个可控制发光二极管串, 有一 个正向多路转换器, 将一传播信号发送到其尾随的可控制发光二极管串, 和 一个反向的多路转换器, 将另一传播信号发送到其领先的可控制发光二极管 串。 In a fifth embodiment, each of the LED control circuits receives two input propagation signals, one of which is transmitted from the upper LED control circuit and the other from the lower LED control circuit. Each LED control circuit sends an output propagation signal to the upper and lower LED control circuits. Each controllable LED string has a forward multiplexer that sends a propagated signal to its trailing controllable LED string, and a reverse multiplexer that sends another propagated signal to it Leading controllable LED string.
在第五实施例中的电压范围检测单元, 用来控制在该装置中的各发光二 极管串内的正向和反向的多路转换器以及各切换单元的状态。 电压比较单元 则发送出一个正向传播信号, 到第一个可控制发光二极管串的第一个发光二 极管控制电路, 一个反向传播信号到最后一个可控制发光二极管串的最后一 个发光二极管控制电路, 并发送出多数个共同信号给每个可控制发光二极管
串的每个发光二极管控制电路, 以便控制在每个发光二极管串内互相串联的 发光二极管数目。 The voltage range detecting unit in the fifth embodiment is for controlling the forward and reverse multiplexers and the states of the respective switching units in the respective LED strings in the device. The voltage comparison unit sends a forward propagation signal to the first LED control circuit of the first controllable LED string, and a reverse propagation signal to the last LED control circuit of the last controllable LED string. And send out a number of common signals to each controllable LED Each of the LEDs of the string controls the circuitry to control the number of LEDs in series with each other within each LED string.
在本发明的第六个优选实施例中, 该装置包括与第五实施例类似, 用于 驱动与多数个切换单元交错的多数个可控制发光二极管串的结构, 但在每个 可控制发光二极管串内, 发光二极管控制电路与相对应的发光二极管的连接 方式, 和第五实施例不同。 每个发光二极管控制电路从相对应的发光二极管 的正极端, 连接到整个发光二极管照明装置的最后一个可控制发光二极管串 的负端, 而不是连接到各别的发光二极管串的负端。 In a sixth preferred embodiment of the invention, the apparatus comprises a structure similar to the fifth embodiment for driving a plurality of controllable LED strings interleaved with a plurality of switching units, but in each controllable light emitting diode In the string, the connection manner of the LED control circuit and the corresponding LED is different from that of the fifth embodiment. Each LED control circuit is connected from the positive terminal of the corresponding LED to the negative terminal of the last controllable LED string of the entire LED illumination device, rather than to the negative terminal of the respective LED string.
根据本发明, 输入电源提供电压供给第一, 第二和第三实施例中的控制 器,和第四,第五和第六实施例中的电压范围检测单元以及电压比较器单元。 在每个实施例中, 被控制器或电压范围检测单元所控制的一电流源, 将最后 一个可控制发光二极管串的负端接到地面。 该电流源, 也可以由一个电阻器 来代替。 附图说明 According to the present invention, the input power supply voltage is supplied to the controllers of the first, second and third embodiments, and the voltage range detecting unit and the voltage comparator unit in the fourth, fifth and sixth embodiments. In each of the embodiments, a current source controlled by the controller or voltage range detecting unit connects the negative terminal of the last controllable LED string to the ground. This current source can also be replaced by a resistor. DRAWINGS
图 1A显示了本发明具有一个用于驱动多数个发光二极管串的通用结构 的装置的第一优选实施例的方块图; 1A shows a block diagram of a first preferred embodiment of the apparatus of the present invention having a general structure for driving a plurality of LED strings;
图 1B显示出以一个电阻器来代替图 1A中的电流源的装置的方块图; 图 2A显示了本发明具有一个用于驱动多数个发光二极管串的通用结构 的装置的第二优选实施例的方块图; Figure 1B shows a block diagram of an apparatus for replacing the current source of Figure 1A with a resistor; Figure 2A shows a second preferred embodiment of the apparatus of the present invention having a general structure for driving a plurality of LED strings. Block diagram
图 2B显示出以一个电阻器来代替图 2A中的电流源的装置的方块图; 图 3A显示了本发明具有一个用于驱动多数个发光二极管串的通用结构 的装置的第三优选实施例的方块图; Figure 2B shows a block diagram of an apparatus in which a resistor is used in place of the current source of Figure 2A; Figure 3A shows a third preferred embodiment of the apparatus of the present invention having a general structure for driving a plurality of LED strings. Block diagram
图 3B显示出以一个电阻器来代替图 3A中的电流源的装置的方块图; 图 4A到图 4C显示本发明的第一,第二和第三优选实施范例中的可控制 发光二极管串的各别范例; Figure 3B shows a block diagram of an apparatus for replacing the current source of Figure 3A with a resistor; Figures 4A-4C show the controllable LED string of the first, second and third preferred embodiments of the present invention. Individual examples;
图 5显示本发明的第一, 第二和第三优选实施范例中的控制器的范例; 图 6显示图 5中的电压范围检测单元的范例方块图; Figure 5 shows an example of a controller in the first, second and third preferred embodiments of the present invention; Figure 6 shows an example block diagram of the voltage range detecting unit in Figure 5;
图 7A显示了本发明具有一个用于驱动多数个发光二极管串的通用结构 的装置的第四优选实施例的方块图;
图 7B显示出以一个电阻器来代替图 7A中的电流源的装置的方块图; 图 8A和图 8B显示本发明的第四优选实施范例中的可控制发光二极管串 的两个范例方块图; Figure 7A shows a block diagram of a fourth preferred embodiment of the apparatus of the present invention having a general structure for driving a plurality of LED strings; Figure 7B is a block diagram showing an arrangement of a resistor in place of the current source of Figure 7A; Figures 8A and 8B are diagrams showing two exemplary blocks of a controllable LED string in a fourth preferred embodiment of the present invention;
图 9显示本发明的第四优选实施范例中的发光二极管控制电路的范例; 图 10A 显示了本发明具有一个用于驱动多数个发光二极管串的通用结 构的装置的第五优选实施例的方块图; Figure 9 shows an example of a light-emitting diode control circuit in a fourth preferred embodiment of the present invention; Figure 10A shows a block diagram of a fifth preferred embodiment of the apparatus of the present invention having a general structure for driving a plurality of light-emitting diode strings. ;
图 10B显示出以一个电阻器来代替图 10A中的电流源的装置的方块图; 图 1 1A和图 1 1B显示本发明的第五优选实施范例中的可控制发光二极管 串的两个范例方块图; Figure 10B is a block diagram showing an arrangement of a resistor in place of the current source of Figure 10A; Figure 1A and Figure 1B show two example blocks of a controllable LED string in a fifth preferred embodiment of the present invention. Figure
图 12显示本发明的第五优选实施范例中的发光二极管控制电路的范例; 图 13A 显示了本发明具有一个用于驱动多数个发光二极管串的通用结 构的装置的第六优选实施例的方块图; Figure 12 is a block diagram showing an example of a light-emitting diode control circuit in a fifth preferred embodiment of the present invention; Figure 13A is a block diagram showing a sixth preferred embodiment of the apparatus of the present invention having a general structure for driving a plurality of light-emitting diode strings. ;
图 13B显示出以一个电阻器来代替图 13A中的电流源的装置的方块图; 以及 Figure 13B is a block diagram showing the arrangement of a resistor in place of the current source of Figure 13A;
图 14A和图 14B显示本发明的第六优选实施范例中的可控制发光二极管 串的两个范例方块图。 14A and 14B show two example block diagrams of a controllable light emitting diode string in a sixth preferred embodiment of the present invention.
其中, 附图标记说明如下: The reference numerals are as follows:
101、 201、 301、 701、 匪、 1301 可控制发光 101, 201, 301, 701, 匪, 1301 controllable illumination
11 1、 21 1、 31 1、 71 1、 1011、 1311 切换单元 11 1, 21 1, 31 1, 71 1, 1011, 1311 switching unit
1 17、 1 18、 217、 218、 317、 318 并联开关 1 17, 1 18, 217, 218, 317, 318 parallel switch
1 19、 219、 319、 719、 1019、 1319 串联开关 1 19, 219, 319, 719, 1019, 1319 series switch
130、 230、 330、 730、 1030、 1330 电流源 130, 230, 330, 730, 1030, 1330 current source
131、 231、 331、 731、 1031、 1331 电阻器 131, 231, 331, 731, 1031, 1331 resistors
140、 141、 240、 241、 340、 341 控制器 140, 141, 240, 241, 340, 341 controller
150、 250、 350、 750、 1050、 1350 发光二极管 150, 250, 350, 750, 1050, 1350 LEDs
151、 251、 351 :控制幵关 151, 251, 351: control
501 模拟至数字转换器 501 analog to digital converter
502 状态机 502 state machine
503 逻辑电路 503 logic circuit
504 电压范围检测单元
601 电压比较器 504 voltage range detection unit 601 voltage comparator
602 逻辑电路 602 logic circuit
603 参考电压产生器 603 reference voltage generator
717、 718、 1017、 1018、 1317、 1318 并联开关 717, 718, 1017, 1018, 1317, 1318 parallel switch
740、 741、 1040、 1041、 1340、 1341 电压范围检测单元 740, 741, 1040, 1041, 1340, 1341 voltage range detection unit
747、 1047 正向选择信号 747, 1047 positive selection signal
751、 1051、 1351 发光二极管控制电路 751, 1051, 1351 LED control circuit
752 输入的传播信号 752 input propagation signal
753 输出的传播信号 753 output propagation signal
760、 1060 正向多路转换器 760, 1060 forward multiplexer
761、 1061 传播信号 761, 1061 propagation signal
780、 1080、 1380 切换电压比较单元 780, 1080, 1380 switching voltage comparison unit
781、 1081 正向传播信号 781, 1081 forward propagation signal
785、 1085 共同信号 785, 1085 common signal
1048 反向选择信号 1048 reverse selection signal
1071 传播信号 1071 Propagation signal
1082 反向传播信号 具体实施方式 1082 Back Propagation Signal
本说明书提供附图, 使本发明更能进一步的被理解, 同时附图也构成本 说明书的一部分。 该附图显示出了本发明的实施例, 并与说明书一起, 用来 解释本发明原理。 The present invention is further understood by the accompanying drawings, and the accompanying drawings also form a part of this specification. The drawings illustrate embodiments of the invention and, together with
图 1A显示出了本发明的第一优选实施例的装置的方块图, 该装置具有 一个用于驱动多数个发光二极管串的通用结构。 在该实施例中, 该装置包括 多数个可控制发光二极管串 101与多数个切换单元 1 1 1交错连接。 其中每个 切换单元 1 1 1连接在每两个可控制发光二极管串 101之间。 如果在该装置中 的可控制发光二极管串的总数为 N时, 切换单元的总数则为 N-l。 BRIEF DESCRIPTION OF THE DRAWINGS Figure 1A is a block diagram showing the apparatus of a first preferred embodiment of the present invention having a general structure for driving a plurality of LED strings. In this embodiment, the apparatus includes a plurality of controllable LED strings 101 interleaved with a plurality of switching units 112. Each of the switching units 1 1 1 is connected between every two controllable LED strings 101. If the total number of controllable LED strings in the device is N, the total number of switching units is N-1.
如图 1A所示, 每个可控制发光二极管串 101包括串接在该可控制发光 二极管串 101的正端和负端间的多数个发光二极管 150, 并且每个发光二极
管 150有一个相对应的控制开关 151。 每个切换单元 111包括两个并联开关 117和 118, 和一个串联开关 119。 As shown in FIG. 1A, each controllable LED string 101 includes a plurality of LEDs 150 connected in series between the positive and negative ends of the controllable LED string 101, and each of the LEDs Tube 150 has a corresponding control switch 151. Each switching unit 111 includes two parallel switches 117 and 118, and a series switch 119.
一个控制器 140被用来控制该多数个可控制发光二极管串 101和该多数 个切换单元 111。 每个控制开关 151被从控制器 140发送的一控制信号所控 制。 控制器 140还发送一个并联连接信号 (P) 和一个串联连接信号 (S) , 到每个切换单元 111。 输入电压 VIN提供电源给该装置。 电流源 130将最后 一个可控制发光二极管串的负端接到地面。 电流源 130也是由控制器 140控 制。 A controller 140 is used to control the plurality of controllable LED strings 101 and the plurality of switching units 111. Each control switch 151 is controlled by a control signal transmitted from the controller 140. The controller 140 also transmits a parallel connection signal (P) and a series connection signal (S) to each of the switching units 111. The input voltage V IN provides power to the device. Current source 130 connects the negative terminal of the last controllable LED string to ground. Current source 130 is also controlled by controller 140.
应当注意的是, 在本实施例中, 可控制发光二极管串 101中的每个发光 二极管 150有一相对应的控制开关 151与该发光二极管 150并联。 因此, 每个发光二极管 150可以经由控制器 140发送的控制信号来控制,而单独的 被短路, 从而可以控制串接在每一可控制发光二极管串 101内的发光二极管 150的总数。 It should be noted that in the present embodiment, each of the light-emitting diodes 150 in the controllable LED string 101 has a corresponding control switch 151 connected in parallel with the light-emitting diode 150. Thus, each of the light emitting diodes 150 can be controlled via a control signal sent by the controller 140 and individually shorted so that the total number of light emitting diodes 150 connected in series within each of the controllable light emitting diode strings 101 can be controlled.
从图 1A中可以看出, 各切换单元 111有一领先的可控制发光二极管串 和一尾随的可控制发光二极管串。 而各切换单元 111则可被控制来将其领先 的可控制发光二极管串和尾随的可控制发光二极管串, 形成并联或串联连 接, 或者将领先的可控制发光二极管串短路。 As can be seen from Figure 1A, each switching unit 111 has a leading controllable LED string and a trailing controllable LED string. Each switching unit 111 can be controlled to connect its leading controllable LED string and the trailing controllable LED string to form a parallel or series connection, or to short the leading controllable LED string.
参考图 1A, 将两个并联开关 117和 118接通, 并切断串联开关 119, 两 个相邻的可控制发光二极管串的正端和负端就可分别连接, 使得两个相邻的 可控制发光二极管串,成为并联相接。相反的,切断两个并联开关 117和 118 并接通串联开关 119, 相邻的两个可控制发光二极管串则成为串联连接。 Referring to FIG. 1A, two parallel switches 117 and 118 are turned on, and the series switch 119 is turned off, and the positive and negative ends of two adjacent controllable LED strings can be respectively connected, so that two adjacent controllable The LED strings are connected in parallel. Conversely, the two parallel switches 117 and 118 are turned off and the series switch 119 is turned on, and the adjacent two controllable light emitting diode strings are connected in series.
将并联开关 117和串联开关 119接通, 而且切断并联开关 118, 就可将 领先的可控制发光二极管串短路。 换句话说, 领先的可控制发光二极管串被 绕过了。 By turning on the parallel switch 117 and the series switch 119, and turning off the parallel switch 118, the leading controllable light-emitting diode string can be short-circuited. In other words, the leading controllable LED string is bypassed.
根据本发明, 控制器 140利用并联连接信号和串联连接信号, 来控制切 换单元 111, 以改变每个切换单元 111 的状态, 并根据输入电压 VIN的电压 高低,来调整电流源 130通过多数个可控制发光二极管串 101的电流。此外, 对于输入电压 VIN的每个特定电压范围之内, 控制器 140还使用控制信号, 来控制在每个可控制发光二极管串 101内串联连接的发光二极管的数目。
举例来说, 假设图 1A的装置是设计给在不同的输入电压 VP V2, ..., 和 1<之下操作的, 其中 V1 <V2 < ... <VK。在该装置中, 将每个可控制发光二 极管串设计成能够承受的最大电压为 V,, 则可控制发光二极管串 101 的总 数, 可以设计成 vx/vP 其中 ^^是 ,, v2, ..., νκ的公倍数。 According to the present invention, the controller 140 controls the switching unit 111 by using the parallel connection signal and the series connection signal to change the state of each switching unit 111, and adjusts the current source 130 through a plurality of according to the voltage level of the input voltage V IN . The current of the LED string 101 can be controlled. In addition, controller 140 also uses control signals to control the number of light-emitting diodes connected in series within each controllable light-emitting diode string 101 for each particular voltage range of input voltage V IN . For example, assume that the device of Figure 1A is designed to operate at different input voltages V P V 2 , ..., and 1 < , where V 1 < V 2 < ... < V K . In this device, each of the controllable LED strings is designed to withstand a maximum voltage of V, and the total number of LED strings 101 can be controlled, which can be designed as v x /v P where ^^ is, v 2 , ..., the common multiple of ν κ .
当该装置的输入电压为 Vn,多数个可控制发光二极管串 101可以由控制 器 140的控制, 而将每 Vx/Vn个可控制发光二极管串并联连接, 然后再形成 Vn/V,组的发光二极管串互相串联连接。 如果电流源 130 的电流被控制为 (Vx/Vn) *1, 其中 I是一个可控制发光二极管串的一般驱动电流, 则该装置 可以驱动多数个可控制发光二极管串, 在不同的输入电压 vP v2, ..., 和 vk下, 提供相同的亮度。 When the input voltage of the device is V n , a plurality of controllable LED strings 101 can be controlled by the controller 140, and each V x /V n controllable LEDs are connected in parallel and then form V n /V. The group of LED strings are connected in series with each other. If the current of current source 130 is controlled to (V x /V n ) *1, where I is a general drive current that can control the string of LEDs, then the device can drive a plurality of controllable LED strings at different inputs. The same brightness is provided at voltages v P v 2 , ..., and v k .
举例来说, 如果该装置是用于输入电压 V, = 110V, V2 = 220V和 V3 = 330V下, VX = 660V是 VP V n V3的公倍数。 该装置中, 可设计成每个可 控制发光二极管串能够承受最大电压 V,= 110V, 而整个装置包 = 6 个可控制发光二极管串。 当输入电压 ν, = 110ν时, 所有 6个可控制发光二 极管串都并联连接。 当输入电压 V2 = 220V时, 每三个可控制发光二极管串 先并联连接, 以形成两组可控制发光二极管串, 然后再将两组的发光二极管 串互相串联连接。 当输入电压 V3 = 330V时, 每两个可控制发光二极管串先 并联连接, 以形成三组可控制发光二极管串, 然后再将三组的发光二极管串 互相串联连接。 For example, if the device is for input voltages V, = 110V, V 2 = 220V and V 3 = 330V, V X = 660V is a common multiple of V P V n V 3 . In this device, it can be designed that each controllable LED string can withstand the maximum voltage V, = 110V, and the entire device package = 6 controllable LED strings. When the input voltage is ν, = 110ν, all six controllable LED strings are connected in parallel. When the input voltage V 2 = 220V, every three controllable LED strings are connected in parallel to form two sets of controllable LED strings, and then the two sets of LED strings are connected in series with each other. When the input voltage V 3 = 330V, each of the two controllable LED strings is connected in parallel to form three sets of controllable LED strings, and then three sets of LED strings are connected in series with each other.
在另一个应用例子中, 假设该装置必须能够承受的最大输入电压为 Vk, 该装置可以设计成总共有 N≥2 个可控制发光二极管串, 而每个可控制发光 二极管串能够承受的最大电压是 Vk/N。 当该装置有一个大于 n* (VK/N) 的 输入电压时, 其中 0≤n≤N, 至少有 (n+1 ) 个可控制发光二极管串都必须串 联连接, 而其它的可控制发光二极管串, 则可以短路绕过或并联连接。例如, 为了在输入电压 100V, 110V, 220V和 240V下使用, 该装置可以设计成包 含有两个可控制发光二极管串, 而每个可控制发光二极管串能承受的最大电 压为 120V。 In another application example, assuming that the device must be able to withstand a maximum input voltage of V k , the device can be designed to have a total of N ≥ 2 controllable LED strings, and each controllable LED string can withstand the maximum The voltage is V k /N. When the device has an input voltage greater than n* (V K /N), where 0≤n≤N, at least (n+1) controllable LED strings must be connected in series, while other controllable illumination The diode strings can be short-circuited or connected in parallel. For example, for use at input voltages of 100V, 110V, 220V and 240V, the device can be designed to contain two controllable LED strings, each of which can withstand a maximum voltage of 120V.
在如图 1A所示的实施例中, 电流源 130可以由一个电阻器来代替。 图 1B显示出以一个电阻器 131来代替电流源 130的方块图。 由于流经电阻器 131 的电流是不可控制的, 图 1B中的装置的控制器 141可以使用并联连接
信号和串联连接信号来控制切换单元 1 1 1, 根据输入电压 v1N的电压高低, 来改变各切换单元 1 1 1的状态, 但不能调整流过电阻器 131的电流。 In the embodiment shown in FIG. 1A, current source 130 can be replaced by a resistor. FIG. 1B shows a block diagram in which a resistor 131 is substituted for current source 130. Since the current flowing through the resistor 131 is uncontrollable, the controller 141 of the device in Fig. 1B can be connected in parallel. The signal and the series connection signal are used to control the switching unit 1 1 1 to change the state of each switching unit 11 1 according to the voltage level of the input voltage v 1N , but the current flowing through the resistor 131 cannot be adjusted.
图 2A显示出了根据本发明的第二优选实施例, 具有一个用于驱动多数 个发光二极管串的通用结构的装置的方块图。 在该实施例中, 该装置包括多 数个可控制发光二极管串 201与多数个切换单元 21 1交错连接。 其中每个切 换单元 21 1连接在每两个可控制发光二极管串 201之间。 如果在该装置中的 可控制发光二极管串的总数为 N时, 切换单元的总数则为 N-l。 Figure 2A shows a block diagram of an apparatus having a general structure for driving a plurality of LED strings in accordance with a second preferred embodiment of the present invention. In this embodiment, the apparatus includes a plurality of controllable light emitting diode strings 201 interleaved with a plurality of switching units 21 1 . Each of the switching units 21 1 is connected between every two controllable light emitting diode strings 201. If the total number of controllable LED strings in the device is N, the total number of switching units is N-1.
从图 2A可以看出, 在第二实施例所示的装置, 除了可控制发光二极管 串 201之外, 几乎与图 1A的第一实施例中所示的装置是相同的。 第一实施 例中, 每个发光二极管 150, 在可控制发光二极管串 101中有一个相对应的 控制开关 151与发光二极管 150并联。在图 2A中, 每个发光二极管 250也 有相对应的控制开关 251。 然而, 该控制开关 251是从相对应的发光二极管 250的正极端, 连接到该可控制发光二极管串 201的负端。 换言之, 所有的 控制开关 251在每个可控制发光二极管串 201内, 都有一个共同端, 连接到 该可控制发光二极管串 201的负端。 因此, 每个发光二极管 250是无法独立 控制的。 例如, 如果从控制器 240发出的控制信号, 将可控制发光二极管串 201内最上方的控制开关 251接通, 则该可控制发光二极管串 20〖 内所有的 发光二极管都被短路绕过。 As can be seen from Fig. 2A, the apparatus shown in the second embodiment is almost the same as the apparatus shown in the first embodiment of Fig. 1A except that the LED string 201 can be controlled. In the first embodiment, each of the light-emitting diodes 150 has a corresponding control switch 151 in parallel with the light-emitting diodes 150 in the controllable light-emitting diode string 101. In Fig. 2A, each of the light emitting diodes 250 also has a corresponding control switch 251. However, the control switch 251 is connected from the positive terminal of the corresponding LED 250 to the negative terminal of the controllable LED string 201. In other words, all of the control switches 251, in each of the controllable LED strings 201, have a common terminal coupled to the negative terminal of the controllable LED string 201. Therefore, each of the light emitting diodes 250 cannot be independently controlled. For example, if the control signal from the controller 240 is turned on, the uppermost control switch 251 in the controllable LED string 201 is turned on, and all of the light-emitting diodes in the controllable LED string 20 are short-circuited.
根据本发明, 在第二实施例中的控制器 240还利用并联连接信号和串联 连接信号, 来控制切换单元 21 1, 以改变每个切换单元 21 1的状态, 并根据 输入电压 VIN的电压高低, 来调整电流源 230通过多数个可控制发光二极管 串 201的电流。 此外, 对于输入电压 VIN的每个特定电压范围之内, 控制器 240还使用控制信号, 来控制在每个可控制发光二极管串 201 内串联连接的 发光二极管的数目。 According to the present invention, the controller 240 in the second embodiment also controls the switching unit 21 1 by using the parallel connection signal and the series connection signal to change the state of each switching unit 21 1 and according to the voltage of the input voltage V IN High or low, to adjust the current source 230 through a plurality of currents that can control the LED string 201. In addition, controller 240 also uses control signals to control the number of light emitting diodes connected in series within each controllable LED string 201 for each particular voltage range of input voltage V IN .
类似于图 1B中, 以一个电阻器 131取代图 1A中的电流源 130, 图 2B 是从图 2A变化而来, 以电阻器 231来取代图 2A的电流源 230。 其结果是, 图 2B中的装置的控制器 241可以使用并联连接信号和串联连接信号来控制 切换单元 21 1, 根据输入电压 VIN的电压高低, 来改变各切换单元 21 1 的状 态, 但不能调整流过电阻器 231的电流。
图 3A显示出了根据本发明的第三优选实施例, 具有一个用于驱动多数 个发光二极管串的通用结构的装置的方块图。 在该实施例中, 该装置包括多 数个可控制发光二极管串 301与多数个切换单元 31 1交错连接。 其中每个切 换单元 31 1连接在每两个可控制发光二极管串 301之间。 如果在该装置中的 可控制发光二极管串的总数为 N时, 切换单元的总数则为 N-l。 Similar to FIG. 1B, the current source 130 of FIG. 1A is replaced with a resistor 131, which is a variation from FIG. 2A, with the resistor 231 replacing the current source 230 of FIG. 2A. As a result, the controller 241 of the apparatus in FIG. 2B can control the switching unit 21 1 using the parallel connection signal and the series connection signal to change the state of each switching unit 21 1 according to the voltage level of the input voltage V IN , but cannot The current flowing through the resistor 231 is adjusted. Figure 3A shows a block diagram of an apparatus having a general structure for driving a plurality of LED strings in accordance with a third preferred embodiment of the present invention. In this embodiment, the apparatus includes a plurality of controllable light emitting diode strings 301 interleaved with a plurality of switching units 31 1 . Each of the switching units 31 1 is connected between every two controllable LED strings 301. If the total number of controllable LED strings in the device is N, the total number of switching units is N1.
从图 3A可以看出, 在第三实施例所示的装置, 除了可控制发光二极管 串 301之外, 几乎与图 2A的第二实施例中所示的装置是相同的。 第二实施 例中,在可控制发光二极管串 201中与每个发光二极管 250相对应的控制幵 关 251, 都有一个共同端, 连接到该可控制发光二极管串 201的负端。 然而 在图 3A中, 每个控制开关 351的一个共同端, 是连接到整个装置里的最后 一个可控制发光二极管串 301的负端。 因此, 每个发光二极管 350是无法独 立控制的。 例如, 如果从控制器 340发出的控制信号, 将最左边的可控制发 光二极管串 301内最上方的控制开关 351接通, 则整个装置里的所有的发光 二极管都被短路绕过。 As can be seen from Fig. 3A, the apparatus shown in the third embodiment is almost the same as the apparatus shown in the second embodiment of Fig. 2A except that the light-emitting diode string 301 can be controlled. In the second embodiment, the control gates 251 corresponding to each of the light-emitting diodes 250 in the controllable light-emitting diode string 201 have a common terminal connected to the negative terminal of the controllable light-emitting diode string 201. However, in Figure 3A, a common terminal of each control switch 351 is the negative terminal of the last controllable LED string 301 that is connected to the entire device. Therefore, each of the light emitting diodes 350 cannot be independently controlled. For example, if a control signal from the controller 340 is turned on, the uppermost control switch 351 in the leftmost controllable light emitting diode string 301 is turned on, and all of the light emitting diodes in the entire device are short-circuited.
根据本发明, 在第三实施例中的控制器 340还利用并联连接信号和串联 连接信号, 控制切换单元 311, 以改变每个切换单元 311的状态, 并根据输 入电压 V1N的电压高低, 来调整电流源 330通过多数个可控制发光二极管串 301的电流。此外, 对于输入电压 VIN的每个特定电压范围之内, 控制器 340 还使用控制信号, 来控制在每个可控制发光二极管串 301内串联连接的发光 二极管的数目。 According to the present invention, the controller 340 in the third embodiment also controls the switching unit 311 to change the state of each switching unit 311 by using the parallel connection signal and the series connection signal, and according to the voltage level of the input voltage V 1N . The current source 330 is adjusted to pass current through a plurality of controllable LED strings 301. In addition, controller 340 also uses control signals to control the number of light emitting diodes connected in series within each controllable LED string 301 for each particular voltage range of input voltage V IN .
类似于图 2B中, 以一个电阻器 231取代图 2A中的电流源 230, 图 3B 是从图 3A变化而来, 以电阻器 331来取代图 3A的电流源 330。 其结果是, 图 3B中的装置的控制器 341可以使用并联连接信号和串联连接信号来控制 切换单元 31 1, 根据输入电压 VIN的电压高低, 来改变各切换单元 31 1 的状 态, 但不能调整流过电阻器 331的电流。 Similar to Fig. 2B, the current source 230 of Fig. 2A is replaced with a resistor 231, which is a variation from Fig. 3A, with the resistor 331 replacing the current source 330 of Fig. 3A. As a result, the controller 341 of the apparatus in FIG. 3B can control the switching unit 31 1 using the parallel connection signal and the series connection signal, and change the state of each switching unit 31 1 according to the voltage level of the input voltage V IN , but cannot The current flowing through the resistor 331 is adjusted.
本发明显示于图 1A和图 1B, 图 2A和图 2B和图 3A和图 3B的可控制 发光二极管串, 只是用于方便说明, 是实上本发明还可以有许多设计上的变 化, 以满足发光二极管照明装置的要求。图 4A到图 4C显示出在本发明的第 一,第二和第三实施例中的可控制发光二极管串的其它几个实施例。如图 4A 所示, 在第一实施例的可控制发光二极管串中, 又可包括一个电阻器与发光
二极管串联连接。 图 4B也显示出, 在第二实施例中, 一个电阻器与可控制 发光二极管串中的发光二极管串联连接。 在图 4C中, 显示出第三实施例的 可控制发光二极管串中的每一个控制开关, 与一个电阻器连接。 在这些例子 中的电阻器都是可有可无的。 The present invention is shown in Figures 1A and 1B, and the controllable LED strings of Figures 2A and 2B and Figures 3A and 3B are for ease of illustration only. In fact, the present invention can also have many design variations to meet LED lighting requirements. Figures 4A through 4C show other embodiments of controllable light emitting diode strings in the first, second and third embodiments of the present invention. As shown in FIG. 4A, in the controllable LED string of the first embodiment, a resistor and a light source may be further included. The diodes are connected in series. Figure 4B also shows that in the second embodiment, a resistor is connected in series with the LEDs in the controllable LED string. In Fig. 4C, each of the controllable light emitting diode strings of the third embodiment is shown connected to a resistor. The resistors in these examples are optional.
图 5显示根据本发明的第一, 第二和第三实施例的装置的控制器的方框 图。 该控制器包括一个模拟 /数字 (A/D ) 转换器 501, 一个状态机 502, 一 以逻辑电路或存储记忆器实现的控制逻辑单元 503, 电压范围检测单元 504。 该模拟 /数字转换器 501,将输入电压 V1N转换后,输出数字信号到状态机 502。 电压范围检测单元 504 也输出控制信号到主掌控制逻辑单元 503 的状态机 502, 使其输出控制信号给每个可控制发光二极管串。 Figure 5 shows a block diagram of a controller of the apparatus according to the first, second and third embodiments of the present invention. The controller includes an analog/digital (A/D) converter 501, a state machine 502, a control logic unit 503 implemented in a logic circuit or a memory, and a voltage range detecting unit 504. The analog/digital converter 501 converts the input voltage V 1N and outputs a digital signal to the state machine 502. The voltage range detecting unit 504 also outputs a control signal to the state machine 502 of the master control logic unit 503 to output a control signal to each of the controllable LED strings.
电压范围检测单元 504发送并联连接信号和串联连接信号给多数个切换 单元。 如果装置中使用一个电流源, 电压范围检测单元 504, 也连接到该电 流源以控制电流源的电流。 如果该装置中是用一个电阻器来取代电流源, 则 该状态机 502从该电阻器接收电流感测信号。 The voltage range detecting unit 504 transmits the parallel connection signal and the series connection signal to a plurality of switching units. If a current source is used in the device, voltage range detection unit 504 is also coupled to the current source to control the current of the current source. If a resistor is used in the device in place of the current source, the state machine 502 receives a current sense signal from the resistor.
图 6显示出一电压范围检测单元的方块图的范例,电压范围检测单元内, 包括用于检测输入电压 V1N的电压范围的多数个电压比较器 601。 由逻辑电 路或存储记忆器所组成的控制逻辑单元 602, 提供并联连接信号和串联连接 信号给多数个切换单元。 由控制逻辑单元 602驱动的参考电压产生器 603, 提供控制信号, 以控制通过电流源的电流。 Fig. 6 shows an example of a block diagram of a voltage range detecting unit including a plurality of voltage comparators 601 for detecting a voltage range of the input voltage V 1N . A control logic unit 602, consisting of a logic circuit or a memory, provides a parallel connection signal and a series connection signal to a plurality of switching units. A reference voltage generator 603, driven by control logic unit 602, provides a control signal to control the current through the current source.
图 7A显示出了根据本发明的第四优选实施例, 具有一个用于驱动多数 个发光二极管串的通用结构的装置的方块图。 在该实施例中, 该装置包括多 数个可控制发光二极管串 701与多数个切换单元 71 1交错连接。 其中每个切 换单元 71 1连接在每两个可控制发光二极管串 701之间。 如果在该装置中的 可控制发光二极管串的总数为 N时, 切换单元的总数则为 N-l。 Figure 7A shows a block diagram of an apparatus having a general structure for driving a plurality of LED strings in accordance with a fourth preferred embodiment of the present invention. In this embodiment, the apparatus includes a plurality of controllable light emitting diode strings 701 interleaved with a plurality of switching units 71 1 . Each of the switching units 71 1 is connected between every two controllable light emitting diode strings 701. If the total number of controllable LED strings in the device is N, the total number of switching units is N-1.
参考图 7A所示, 每个可控制发光二极管串 701包括串接在该可控制发 光二极管串 701的正端和负端间的多数个发光二极管 750, 并且每个发光二 极管 750有一个相对应的发光二极管控制电路 751。 除此之外, 每个可控制 发光二极管串 701, 包含一正向多路转换器 760, 以送出一传播信号 761, 到 下一个可控制发光二极管串。 每个切换单元 71 1 包括两个并联开关 717 和 718, 和一个串联开关 719。
一个电压范围检测单元 740控制该多数个切换单元 71 1。 电压范围检测 单元 740还发送一个并联连接信号 (P ) 和一个串联连接信号 (S ) , 到每个 切换单元 71 1。 输入电压 VIN提供电源给该装置。 电流源 730将最后一个可 控制发光二极管串的负端接到地面。电流源 730也是由电压范围检测单元 740 控制。 Referring to FIG. 7A, each of the controllable LED strings 701 includes a plurality of light emitting diodes 750 connected in series between the positive and negative ends of the controllable LED string 701, and each of the LEDs 750 has a corresponding one. Light-emitting diode control circuit 751. In addition, each controllable LED string 701 includes a forward multiplexer 760 for delivering a propagated signal 761 to the next controllable LED string. Each switching unit 71 1 includes two parallel switches 717 and 718, and a series switch 719. A voltage range detecting unit 740 controls the plurality of switching units 71 1 . The voltage range detecting unit 740 also transmits a parallel connection signal (P) and a series connection signal (S) to each switching unit 71 1 . The input voltage V IN provides power to the device. Current source 730 connects the negative terminal of the last controllable LED string to ground. Current source 730 is also controlled by voltage range detection unit 740.
在本发明的第四实施例中, 该装置还包括发送一些共同信号 785, 到每 一个发光二极管控制电路 751 的切换电压比较单元 780。 如图 7A所显示, 每个发光二极管控制电路 751接收到一个输入的传播信号 752和发送出一个 输出的传播信号 753到下一个发光二极管控制电路。 In a fourth embodiment of the invention, the apparatus further includes a switching voltage comparison unit 780 that transmits a common signal 785 to each of the LED control circuits 751. As shown in Figure 7A, each LED control circuit 751 receives an input propagation signal 752 and an output propagation signal 753 to the next LED control circuit.
从图 7A中还可以看出, 与在最左边的可控制发光二极管串的最上面的 一发光二极管并联的第一发光二极管控制电路, 从切换电压比较单元 780接 收一正向传播信号 781。 输出传输信号 753从第一发光二极管控制电路被传 播到下一个发光二极管控制电路, 再传播一输出传输信号到下一个发光二极 管控制电路, 并依此类推。 As can also be seen from Figure 7A, a first LED control circuit in parallel with the uppermost one of the leftmost controllable LED strings receives a forward propagation signal 781 from the switching voltage comparison unit 780. The output transmission signal 753 is propagated from the first LED control circuit to the next LED control circuit, and then an output transmission signal is propagated to the next LED control circuit, and so on.
如图 7A所示, 最左边的可控制发光二极管串内的正向多路转换器 760, 接收从切换电压比较单元 780发送的正向传播信号 781, 和最左边的可控制 发光二极管串的最下方的发光二极管控制电路输出的传输信号 753, 并发送 一个传播信号 761到第二个最左边的可控制发光二极管串的最上方的发光二 极管控制电路。 电压范围检测单元 740也发送一个的正向选择信号 747, 到 每一个可控制发光二极管串 701, 来选择和控制在每个可控制发光二极管串 内的正向多路转换器 760, 使其发送一传播信号 761, 作为与下一个可控制 发光二极管串内最上方的发光二极管, 相对应的发光二极管控制电路的输入 的传播信号。 As shown in FIG. 7A, the forward multiplexer 760 in the leftmost controllable LED string receives the forward propagation signal 781 transmitted from the switching voltage comparison unit 780, and the most leftmost controllable LED string. The lower LED control circuit outputs a transmission signal 753 and transmits a propagation signal 761 to the uppermost LED control circuit of the second leftmost controllable LED string. The voltage range detecting unit 740 also sends a forward selection signal 747 to each of the controllable LED strings 701 to select and control the forward multiplexer 760 in each of the controllable LED strings for transmission. A propagation signal 761 acts as a propagation signal for the input of the LED control circuit corresponding to the uppermost LED within the next controllable LED string.
根据本发明,电压范围检测单元 740利用并联连接信号和串联连接信号, 来控制切换单元 71 1, 以改变每个切换单元 71 1的状态,并根据输入电压 V1N 的电压高低,来调整电流源 730通过多数个可控制发光二极管串 701的电流。 According to the present invention, the voltage range detecting unit 740 controls the switching unit 71 1 by using the parallel connection signal and the series connection signal to change the state of each switching unit 71 1 and adjust the current source according to the voltage level of the input voltage V 1N . 730 passes through a plurality of currents that control the LED string 701.
在如图 7A所示的实施例中, 电流源 730可以由一个电阻器来代替。 图 7B显示出以一个电阻器 731来代替电流源 730的方块图。 由于流经电阻器 731 的电流是不可控制的, 图 7B中的装置的电压范围检测单元 741可以使 用并联连接信号和串联连接信号来控制切换单元 71 1, 根据输入电压 VIN的
电压高低, 来改变各切换单元 71 1的状态, 但不能调整流过电阻器 731的电 流。 In the embodiment shown in Figure 7A, current source 730 can be replaced by a resistor. FIG. 7B shows a block diagram in which a resistor 731 is substituted for current source 730. Since the current flowing through the resistor 731 is uncontrollable, the voltage range detecting unit 741 of the apparatus in FIG. 7B can control the switching unit 71 1, using the parallel connection signal and the series connection signal, according to the input voltage V IN The voltage is high or low to change the state of each switching unit 71 1 , but the current flowing through the resistor 731 cannot be adjusted.
应该注意的是, 在图 7A所示的本发明的实施例中, 在可控制发光二极 管串 701内的每个发光二极管都有一个相对应的发光二极管, 但在某些应用 中, 可控制发光二极管串 701内至少一个发光二极管必须是亮的, 因此在最 上方的一个发光二极管控制电路 751就可以免除。 在这样的情况下, 从切换 电压比较单元 780或正向多路转换器 760送出的传播信号, 就直接发送到与 第二发光二极管相对应的发光二极管控制电路。 It should be noted that in the embodiment of the invention illustrated in FIG. 7A, each of the light-emitting diodes within the controllable LED string 701 has a corresponding light-emitting diode, but in some applications, controllable illumination At least one of the LEDs in the diode string 701 must be bright, so that the uppermost one of the LED control circuits 751 can be dispensed with. In such a case, the propagation signal sent from the switching voltage comparison unit 780 or the forward multiplexer 760 is directly transmitted to the light-emitting diode control circuit corresponding to the second light-emitting diode.
如前所述, 切换电压比较单元 780发送几个共同信号 785到每个发光二 极管控制电路 751。 这些共同信号 785包括重置信号, 上 /下信号, 和同步信 号。重置信号将所有的发光二极管控制电路 751重置到其初始状态, 上 /下信 号表示输入电压 V1N是在増加或减少, 同步信号使所有的发光二极管控制电 路 751能同步切换。 切换电压比较单元 780包括有电压比较器, 用来根据输 入电压 VIN来产生共同信号 785。 As previously described, the switching voltage comparison unit 780 transmits several common signals 785 to each of the LED control circuits 751. These common signals 785 include a reset signal, an up/down signal, and a sync signal. The reset signal resets all of the LED control circuit 751 to their initial state, the up/down signal indicates that the input voltage V 1N is increasing or decreasing, and the synchronization signal enables all of the LED control circuits 751 to be switched synchronously. The switching voltage comparison unit 780 includes a voltage comparator for generating a common signal 785 based on the input voltage V IN .
图 8A和图 8B显示出了第四实施例的装置中,可控制发光二极管串的两 个范例的方块图。 图 8A所显示的电路是与图 7A和图 7B显示的可控制发光 二极管串相同, 图 8B则显示出在可控制发光二极管串内的发光二极管串又 与一个电阻器串联。 8A and 8B are block diagrams showing two examples of controllable LED strings in the apparatus of the fourth embodiment. The circuit shown in Figure 8A is the same as the controllable LED string shown in Figures 7A and 7B, and Figure 8B shows the LED string in the controllable LED string in series with a resistor.
图 9显示出了本发明的第四优选实施例的发光二极管控制电路 751的一 电路范例。 在切换电压比较单元 780的控制下, 每一个发光二极管控制电路 751, 可将相对应的发光二极管短路绕接。 根据本发明, 在每一个可控制发 光二极管串的发光二极管控制电路可以是不相同的。 Fig. 9 shows an example of a circuit of the light emitting diode control circuit 751 of the fourth preferred embodiment of the present invention. Under the control of the switching voltage comparison unit 780, each of the LED control circuits 751 can short-circuit the corresponding LEDs. In accordance with the present invention, the LED control circuitry at each of the controllable light emitting diode strings can be different.
图 10A显示出了根据本发明的第五优选实施例,具有一个用于驱动多数 个发光二极管串的通用结构的装置的方块图。 在该实施例中, 该装置包括多 数个可控制发光二极管串 1001与多数个切换单元 101 1交错连接。 其中每个 切换单元 101 1连接在每两个可控制发光二极管串 1001之间。 如果在该装置 中的可控制发光二极管串的总数为 N时, 切换单元的总数则为 N-l。 Figure 10A shows a block diagram of an apparatus having a general structure for driving a plurality of LED strings in accordance with a fifth preferred embodiment of the present invention. In this embodiment, the apparatus includes a plurality of controllable light emitting diode strings 1001 interleaved with a plurality of switching units 101 1 . Each of the switching units 101 1 is connected between every two controllable light emitting diode strings 1001. If the total number of controllable LED strings in the device is N, the total number of switching units is N-1.
参考图 10A所示, 每个可控制发光二极管串 1001包括串接在该可控制 发光二极管串 1001的正端和负端间的多数个发光二极管 1050, 并且每个发 光二极管 1050有一个相对应的发光二极管控制电路 1051, 但是该发光二极
管控制电路 1051是从相对应的发光二极管 1050的正极端,连接到该可控制 发光二极管串 1001的负端, 而不是与相对应的发光二极管 1050并联。 Referring to FIG. 10A, each of the controllable light emitting diode strings 1001 includes a plurality of light emitting diodes 1050 connected in series between the positive and negative ends of the controllable light emitting diode string 1001, and each of the light emitting diodes 1050 has a corresponding one. LED control circuit 1051, but the LED The tube control circuit 1051 is connected from the positive terminal of the corresponding light emitting diode 1050 to the negative terminal of the controllable light emitting diode string 1001 instead of being in parallel with the corresponding light emitting diode 1050.
在本发明的第五实施例中, 每个可控制发光二极管串 1001 包含有发送 传播信号 1061到下一个可控制发光二极管串的正向多路转换器 1060, 和一 个发送另一传播信号 1071 到前一个可控制发光二极管串的反向多路转换器 1070。每个切换单元 101 1还包括两个并联开关 1017和 1018, 和一个串联开 关 1019。 In a fifth embodiment of the invention, each controllable LED string 1001 includes a forward multiplexer 1060 that transmits a propagated signal 1061 to a next controllable LED string, and one transmits another propagated signal 1071 to The former is an inverse multiplexer 1070 that controls the string of LEDs. Each switching unit 101 1 also includes two parallel switches 1017 and 1018, and a series switch 1019.
一个电压范围检测单元 1040控制该多数个切换单元 101 1。 电压范围检 测单元 1040还发送一个并联连接信号 (P ) 和一个串联连接信号 (S ) , 到 每个切换单元 101 1。 输入电压 V1N提供电源给该装置。 电流源 1030将最后 一个可控制发光二极管串的负端接到地面。 电流源 1030也是由电压范围检 测单元 1040控制。 A voltage range detecting unit 1040 controls the plurality of switching units 101 1 . The voltage range detecting unit 1040 also transmits a parallel connection signal (P) and a series connection signal (S) to each switching unit 101 1 . The input voltage V 1N provides power to the device. Current source 1030 connects the negative terminal of the last controllable LED string to ground. Current source 1030 is also controlled by voltage range detecting unit 1040.
在本发明的第五实施例中, 该装置还包括发送一些共同信号 1085, 到每 一个发光二极管控制电路 1051的切换电压比较单元 1080。 如图 10A所示, 除了在每个可控制发光二极管串内的第一和最后的发光二极管控制电路之 夕卜, 每个发光二极管控制电路 1051 接收到上一个发光二极管控制电路传来 的一个输入的传播信号, 和下一个发光二极管控制电路传来的另一个输入的 传播信号, 并且发送出一个输出的传播信号到上下的两个发光二极管控制电 路。 In a fifth embodiment of the invention, the apparatus further includes a switching voltage comparison unit 1080 that transmits a common signal 1085 to each of the light emitting diode control circuits 1051. As shown in FIG. 10A, in addition to the first and last LED control circuits in each of the controllable LED strings, each LED control circuit 1051 receives an input from the previous LED control circuit. The propagation signal, and the other input propagation signal from the next LED control circuit, and send an output propagation signal to the upper and lower LED control circuits.
从图 10A可以看出,在最左边的可控制发光二极管串内并联在最上方的 发光二极管的第一个 (最上方) 发光二极管控制电路, 从切换电压比较单元 1080接收到正向传播信号 1081。 除了最左边的可控制发光二极管串之外, 每个可控制发光二极管串内的第一个(最上方)发光二极管控制电路,接收其 左的一个可控制发光二极管串的正向多路转换器 1060发送的传播信号 1061。 As can be seen from FIG. 10A, the first (uppermost) LED control circuit of the uppermost LED is connected in parallel in the leftmost controllable LED string, and the forward propagation signal 1081 is received from the switching voltage comparison unit 1080. . In addition to the leftmost controllable LED string, each of the first (uppermost) LED control circuits within the controllable LED string receives a forward multiplexer of its controllable LED string The propagated signal 1061 transmitted by 1060.
从图 10A也可以看出,在最右边的可控制发光二极管串内并联在最下方 的发光二极管的最后一个 (最下方) 发光二极管控制电路, 从切换电压比较 单元 1080接收到反向传播信号 1082。 除了最右边的可控制发光二极管串之 夕卜, 每个可控制发光二极管串内的最后一个(最下方)发光二极管控制电路, 接收其右的一个可控制发光二极管串的反向多路转换器 1070 发送的传播信 号 1071。
除在最左和最右的可控制发光二极管串之外, 在每个可控制发光二极管 串内的反向多路转换器 1070,接收从最上方的发光二极管控制电路发送的传 播信号, 和从其右的一个可控制发光二极管串发送的传播信号 1071, 然后输 出另一传播信号 1071 到其左的一个可控制发光二极管串。 同样地, 除了在 最左和最右的可控制发光二极管串之外, 在每个可控制发光二极管串内的正 向多路转换器 1060, 接收从最下方的发光二极管控制电路发送的传播信号, 和从其左的一个可控制发光二极管串发送的传播信号 1061,然后输出另一传 播信号 1061到其右的一个可控制发光二极管串。 As can also be seen from FIG. 10A, the last (lowest) LED control circuit of the lowest-level LED in parallel in the rightmost controllable LED string receives the backpropagation signal 1082 from the switching voltage comparison unit 1080. . In addition to the rightmost controllable LED string, each of the last (lowest) LED control circuits within the controllable LED string receives an inverted multiplexer of its controllable LED string 1070 Transmitted signal 1071. In addition to the leftmost and rightmost controllable LED strings, an inverse multiplexer 1070 within each controllable LED string receives the propagated signal transmitted from the uppermost LED control circuit, and The right one controls the propagated signal 1071 transmitted by the LED string and then outputs another propagated signal 1071 to a left controllable LED string. Similarly, in addition to the leftmost and rightmost controllable LED strings, a forward multiplexer 1060 within each controllable LED string receives the propagated signal transmitted from the lowest LED control circuit. And a propagated signal 1061 transmitted from a left controllable LED string, and then another propagated signal 1061 to a right controllable LED string.
根据本发明, 在第五实施例中, 电压范围检测单元 1040利用并联连接 信号和串联连接信号, 来控制切换单元 101 1, 以改变每个切换单元 101 1的 状态, 并根据输入电压 VIN的电压高低, 来调整电流源 1030通过多数个可控 制发光二极管串 1001 的电流。 电压范围检测单元 1040, 也发送一个正向选 择信号 1047和一个反向选择信号 1048, 到每个可控制发光二极管串 1001, 以分别选择和控制每个可控制发光二极管串的正向多路转换器 1060和反向 多路转换器 1070。 According to the present invention, in the fifth embodiment, the voltage range detecting unit 1040 controls the switching unit 101 1 by using the parallel connection signal and the series connection signal to change the state of each switching unit 101 1 and according to the input voltage V IN The voltage level is adjusted to regulate the current of the current source 1030 through a plurality of controllable LED strings 1001. The voltage range detecting unit 1040 also sends a forward selection signal 1047 and a reverse selection signal 1048 to each controllable LED string 1001 to select and control forward multiplexing of each controllable LED string, respectively. The device 1060 and the inverse multiplexer 1070.
类似于图 7B中, 以一个电阻器 731取代图 7A中的电流源 730, 图 10B 是从图 10A变化而来, 以电阻器 1031来取代图 10A的电流源 1030。其结果 是, 图 10B中的装置的电压范围检测单元 1041可以使用并联连接信号和串 联连接信号来控制切换单元 101 1, 根据输入电压 V1N的电压高低, 来改变各 切换单元 101 1的状态, 但不能调整流过电阻器 1031的电流。 Similar to Fig. 7B, the current source 730 of Fig. 7A is replaced with a resistor 731, which is a variation from Fig. 10A, with the resistor 1031 replacing the current source 1030 of Fig. 10A. As a result, the voltage range detecting unit 1041 of the apparatus in FIG. 10B can control the switching unit 101 1 using the parallel connection signal and the series connection signal, and change the state of each switching unit 101 1 according to the voltage level of the input voltage V 1N . However, the current flowing through the resistor 1031 cannot be adjusted.
根据在图 10A 所示的本发明的第五实施例中, 在可控制发光二极管串 1001内的每个发光二极管都有一个相对应的发光二极管, 但在某些应用中, 可控制发光二极管串 1001 内至少一个发光二极管是必须是亮的, 因此在最 上方的第一个发光二极管控制电路 1051就可以免除。 According to the fifth embodiment of the present invention shown in FIG. 10A, each of the light-emitting diodes in the controllable light-emitting diode string 1001 has a corresponding light-emitting diode, but in some applications, the light-emitting diode string can be controlled. At least one of the LEDs in 1001 must be bright, so that the first LED control circuit 1051 at the top can be dispensed with.
切换电压比较单元 1080发送几个共同信号 1085到每个发光二极管控制 电路 1051。 这些共同信号 1085包括重置信号, 上 /下信号, 和同步信号。 重 置信号将所有的发光二极管控制电路 1051重置到其初始状态, 上 /下信号表 示输入电压 VIN是在増加或减少, 同步信号使所有的发光二极管控制电路 1051能同步切换。 切换电压比较单元 1080包括有电压比较器, 用来根据输 入电压 VIN来产生共同信号 1085。
图 1 1A和图 1 1B显示出了第五实施例的装置中,可控制发光二极管串的 两个范例的方块图。 图 1 1A所显示的电路是与图 10A和图 10B的可控制发 光二极管串相同, 图 1 1B则显示出在可控制发光二极管串内的发光二极管串 又与一个电阻器串联。 The switching voltage comparison unit 1080 transmits several common signals 1085 to each of the light emitting diode control circuits 1051. These common signals 1085 include a reset signal, an up/down signal, and a sync signal. The reset signal resets all of the LED control circuits 1051 to their initial state. The up/down signal indicates that the input voltage V IN is increasing or decreasing, and the synchronization signal enables all of the LED control circuits 1051 to be switched synchronously. The switching voltage comparison unit 1080 includes a voltage comparator for generating a common signal 1085 based on the input voltage V IN . 1A and 1B show block diagrams of two examples of controllable LED strings in the apparatus of the fifth embodiment. The circuit shown in Fig. 1A is the same as the controllable LED string of Figs. 10A and 10B, and Fig. 11B shows that the LED string in the controllable LED string is in series with a resistor.
根据本发明, 切换电压比较单元 1080控制每一个发光二极管控制电路 According to the present invention, the switching voltage comparison unit 1080 controls each of the light emitting diode control circuits
1051。 每个发光二极管控制电路可以将一个或多数个发光二极管在可控制发 光二极管串之内短路。 例如, 在最上方的发光二极管控制电路, 可以短路绕 过在该可控制发光二极管串 1001 内所有的发光二极管, 但在最下方的发光 二极管控制电路, 则只能将该可控制发光二极管串 1001 内最下方的发光二 极管短路绕过。 根据本发明, 在可控制发光二极管串内的发光二极管控制电 路可以是不相同的。 图 12显示出发光二极管控制电路 1051的一个例子。 1051. Each LED control circuit can short-circuit one or more of the LEDs within the controllable LED string. For example, in the uppermost LED control circuit, all of the LEDs in the controllable LED string 1001 can be short-circuited, but in the lower LED control circuit, the controllable LED string 1001 can only be used. The lowermost LED inside is short-circuited. In accordance with the present invention, the LED control circuitry within the controllable LED string can be different. Fig. 12 shows an example of the light emitting diode control circuit 1051.
图 13A显示出了根据本发明的第六优选实施例,具有一个用于驱动多数 个发光二极管串的通用结构的装置的方块图。 在该实施例中, 该装置包括多 数个可控制发光二极管串 1301与多数个切换单元 131 1交错连接。 其中每个 切换单元 131 1连接在每两个可控制发光二极管串 1301之间。 如果在该装置 中的可控制发光二极管串的总数为 N时, 切换单元的总数则为 N-1。 Figure 13A shows a block diagram of an apparatus having a general structure for driving a plurality of LED strings in accordance with a sixth preferred embodiment of the present invention. In this embodiment, the apparatus includes a plurality of controllable light emitting diode strings 1301 interleaved with a plurality of switching units 131 1 . Each of the switching units 131 1 is connected between every two controllable light emitting diode strings 1301. If the total number of controllable LED strings in the device is N, the total number of switching units is N-1.
从图 13A可以看出, 在第六实施例所示的装置, 除了可控制发光二极管 串 1301之外, 几乎与图 10A的第五实施例中所示的装置是相同的。 第五实 施例中,在可控制发光二极管串 1001中与每个发光二极管 1050相对应的控 制开关 1051, 都有一个共同端, 连接到该可控制发光二极管串 1001的负端。 然而在图 13A中, 每个发光二极管控制电路 1351的一个共同端, 是连接到 整个装置里的最后一个可控制发光二极管串 1301的负端。 As can be seen from Fig. 13A, the apparatus shown in the sixth embodiment is almost the same as the apparatus shown in the fifth embodiment of Fig. 10A except that the light-emitting diode string 1301 can be controlled. In the fifth embodiment, the control switch 1051 corresponding to each of the light-emitting diodes 1050 in the controllable light-emitting diode string 1001 has a common terminal connected to the negative terminal of the controllable light-emitting diode string 1001. In Fig. 13A, however, a common terminal of each of the LED control circuits 1351 is the negative terminal of the last controllable LED string 1301 connected to the entire apparatus.
根据本发明, 在第六实施例中, 电压范围检测单元 1340利用并联连接 信号和串联连接信号, 来控制切换单元 131 1, 以改变每个切换单元 1311的 状态, 并根据输入电压 VIN的电压高低, 来调整电流源 1330通过多数个可控 制发光二极管串 1301的电流。 According to the present invention, in the sixth embodiment, the voltage range detecting unit 1340 controls the switching unit 131 1 by using the parallel connection signal and the series connection signal to change the state of each switching unit 1311, and according to the voltage of the input voltage V IN High and low, to adjust the current source 1330 through a plurality of current controllable LED string 1301 current.
类似于图 10B中, 以一个电阻器 1031取代图 10A中的电流源 1030, 图 13B是从图 13A变化而来, 以电阻器 1331来取代图 10A的电流源 1330。 其 结果是, 图 13B中的装置的电压范围检测单元 1341可以使用并联连接信号
和串联连接信号来控制切换单元 131 1, 根据输入电压 VIN的电压高低, 来改 变各切换单元 131 1的状态, 但不能调整流过电阻器 1331的电流。 Similar to Fig. 10B, the current source 1030 of Fig. 10A is replaced with a resistor 1031, and Fig. 13B is changed from Fig. 13A, replacing the current source 1330 of Fig. 10A with a resistor 1331. As a result, the voltage range detecting unit 1341 of the apparatus in FIG. 13B can use the parallel connection signal. The switching unit 131 is connected to the series connection signal to change the state of each switching unit 131 1 according to the voltage level of the input voltage V IN , but the current flowing through the resistor 1331 cannot be adjusted.
图 14A和图 14B显示出了第六实施例的装置中,可控制发光二极管串的 两个范例的方块图。 图 14A所显示的电路是与图 13A和图 13B的可控制发 光二极管串相同, 图 14B则显示出在可控制发光二极管串内的发光二极管串 和每个发光二极管控制电路, 各别又与一个电阻器串联。 还要注意的是, 本 发明的第六实施例中的发光二极管控制电路 1351, 与如图 12所示的第五实 施例中的发光二极管控制电路 1051是相同的。 14A and 14B are block diagrams showing two examples of controllable LED strings in the apparatus of the sixth embodiment. The circuit shown in FIG. 14A is the same as the controllable LED string of FIGS. 13A and 13B, and FIG. 14B shows the LED string and each LED control circuit in the controllable LED string, one by one. The resistors are connected in series. It is to be noted that the light-emitting diode control circuit 1351 in the sixth embodiment of the present invention is the same as the light-emitting diode control circuit 1051 in the fifth embodiment shown in FIG.
根据本发明, 在每个可控制发光二极管串中的发光二极管, 是泛指所有 类型的发光二极管, 如一般半导体发光二极管和有机发光二极管, 这些发光 二极管可能在各种频谱发光。 还应当注意的是, 在上述的说明中, 虽然每个 控制开关或发光二极管控制电路, 都被描述为相对应于在一个可控制发光二 极管串内的一个发光二极管, 然而这样的一个发光二极管, 也可以是包括多 数个发光二极管的一个发光二极管的照明单元。 In accordance with the present invention, the light-emitting diodes in each of the controllable light-emitting diode strings are generally referred to as all types of light-emitting diodes, such as general semiconductor light-emitting diodes and organic light-emitting diodes, which may emit light in various spectrums. It should also be noted that in the above description, although each control switch or LED control circuit is described as corresponding to a light emitting diode within a controllable LED string, such a light emitting diode, It can also be a lighting unit comprising one light-emitting diode of a plurality of light-emitting diodes.
以上为发光二极管控制电路, 切换电压比较单元和电压范围检测单元所 显示和说明的电路范例, 只是用来说明本发明的原理。 这些电路都可以用等 效的电路来设计而达成一样的功能。 切换单元中的并联或串联开关也是泛指 一般包含有可以适当接通或切断一个电路的开关组件, 开关组件可以是机械 式的或电力式的, 也可以是用集成电路制造的半导体开关组件。 The above is an example of a circuit shown and described by the LED control circuit, the switching voltage comparison unit and the voltage range detecting unit, only to illustrate the principle of the present invention. These circuits can be designed with equivalent circuitry to achieve the same function. A parallel or series switch in a switching unit is also generally meant to include a switch assembly that can properly turn a circuit on or off. The switch assembly can be mechanical or electrical, or can be a semiconductor switch assembly fabricated from an integrated circuit.
综上所述, 本发明提供了一种新颖的用于驱动多数个可控制发光二极管 串的通用结构。 经由多数个切换单元与多数个可控制发光二极管串的交错连 接, 两个相邻的发光二极管串可以被并联或串联, 或将领先的发光二极管串 短路绕过。 此外, 控制相对应于每个可控制发光二极管串内的发光二极管的 控制开关, 或发光二极管控制电路, 又可以被根据输入电压, 灵活地调整在 每个可控制发光二极管串内串联的发光二极管的数目。 换言之, 本发明提供 了一种新颖的方法和装置, 用于控制发光二极管串如何以串联和并联连接组 合, 以及控制在每个发光二极管串中有多少个发光二极管串联。 In summary, the present invention provides a novel general structure for driving a plurality of controllable light emitting diode strings. Via a plurality of switching units interleaved with a plurality of controllable LED strings, two adjacent LED strings can be connected in parallel or in series, or short-circuited by a leading LED string. In addition, a control switch corresponding to each of the light-emitting diodes in the controllable LED string, or a light-emitting diode control circuit can be flexibly adjusted according to the input voltage, and the light-emitting diodes connected in series in each controllable LED string can be flexibly adjusted according to the input voltage. Number of. In other words, the present invention provides a novel method and apparatus for controlling how LED strings are connected in series and in parallel, and controlling how many LEDs are connected in series in each LED string.
虽然以上只藉由几个优选的实施范例来描述本发明, 然而熟悉本技术领 域的人, 很明显的可以了解, 仍有许多未描述的变通及修改, 都在不偏离以 下所定义的本发明的申请专利范围之内。
Although the invention has been described above by way of a few preferred embodiments, it will be apparent to those skilled in the art that it is understood that many modifications and modifications may be made without departing from the invention as defined below. Within the scope of the patent application.
Claims
1. 一驱动多数个发光二极管串的装置, 其特征在于, 包括: 1. A device for driving a plurality of LED strings, characterized by comprising:
多数个可控制发光二极管串, 其中每个可控制发光二极管串有一正端, 一负端,多数个发光二极管串联于上述正端和负端之间,和多数个控制开关, 其中每一个控制开关相对应于上述多数个发光二极管中的一个发光二极管; 多数个切换单元与上述多数个可控制发光二极管串交错连接, 其中每个 切换单元, 连接在一领先的可控制发光二极管串和一尾随的可控制发光二极 管串之间; A plurality of controllable LED strings, wherein each of the controllable LED strings has a positive terminal, a negative terminal, a plurality of LEDs connected in series between the positive terminal and the negative terminal, and a plurality of control switches, each of which controls the switch Corresponding to one of the plurality of light emitting diodes; a plurality of switching units are interleaved with the plurality of controllable LED strings, wherein each switching unit is connected to a leading controllable LED string and a trailing Controllable between LED strings;
一输入电源连接到上述多数个可控制发光二极管串的第一个可控制发 光二极管串的正端; An input power source is coupled to the positive terminal of the first controllable light emitting diode string of the plurality of controllable LED strings;
一电流控制器其第一端连接到上述多数个可控制发光二极管串的最后 一个可控制发光二极管串的负端, 其第二端接地; 以及 a current controller having a first end connected to the negative terminal of the last controllable LED string of the plurality of controllable LED strings, the second end of which is grounded;
一控制器接收上述输入电源的电压, 发送多数个发光二极管控制信号, 到上述多数个可控制发光二极管串的每一个可控制发光二极管串, 以及一并 联连接信号和一串联连接信号到上述多数个切换单元的每一个切换单元。 a controller receives the voltage of the input power source, transmits a plurality of LED control signals, and controls each of the plurality of controllable LED strings to control the LED string, and a parallel connection signal and a serial connection signal to the plurality of Switch each switching unit of the unit.
2. 如权利要求 1所述的装置, 其特征在于, 上述多数个可控制发光二极 管串中, 最少有一个可控制发光二极管串有一个发光二极管, 没有相对应的 控制开关。 2. The apparatus according to claim 1, wherein at least one of the plurality of controllable light emitting diode strings has a light emitting diode and no corresponding control switch.
3. 如权利要求 1所述的装置, 其特征在于, 上述多数个可控制发光二极 管串中, 最少有一个可控制发光二极管串中, 有一个电阻器, 连接在上述多 数个发光二极管与该可控制发光二极管串的负端之间。 3. The device according to claim 1, wherein at least one of the plurality of controllable light emitting diode strings has a controllable light emitting diode string, and a resistor is connected to the plurality of light emitting diodes and the Control between the negative ends of the LED strings.
4. 如权利要求 1所述的装置, 其特征在于, 上述多数个可控制发光二极 管串中, 每一个可控制发光二极管串中的每一个控制开关与相对应的发光二 极管并联,并且被一相对应的控制信号控制,使相对应的发光二极管被短路, 或是与在该可控制发光二极管串中其它的发光二极管串联。 4. The apparatus according to claim 1, wherein each of the plurality of controllable light emitting diode strings, each of the controllable light emitting diode strings, is connected in parallel with a corresponding light emitting diode, and is phased. The corresponding control signal is controlled such that the corresponding LED is shorted or in series with other LEDs in the controllable LED string.
5. 如权利要求 1所述的装置, 其特征在于, 上述多数个可控制发光二极 管串中, 每一个可控制发光二极管串中的每一个控制开关, 连接在相对应的 发光二极管的正极端与该可控制发光二极管串中最后一个发光二极管的负 极端, 并且被一相对应的控制信号控制。
5. The apparatus according to claim 1, wherein each of the plurality of controllable LED strings is controllable, each of the control LED switches is connected to a positive terminal of the corresponding LED. The control can control the negative terminal of the last LED in the string of LEDs and is controlled by a corresponding control signal.
6. 如权利要求 1所述的装置, 其特征在于, 上述多数个可控制发光二极 管串中, 每一个可控制发光二极管串中的每一个控制开关, 连接在相对应的 发光二极管的正极端与上述多数个可控制发光二极管串中的最后一个可控 制发光二极管串的负端, 并且被一相对应的控制信号控制。 6. The apparatus according to claim 1, wherein each of the plurality of controllable light emitting diode strings is controllable, each of the control light emitting diode strings is connected to a positive terminal of the corresponding light emitting diode. The last of the plurality of controllable LED strings can control the negative terminal of the LED string and is controlled by a corresponding control signal.
7.如权利要求 6所述的装置, 其特征在于, 上述多数个可控制发光二极 管串中, 最少有一个可控制发光二极管串中, 每一个控制幵关都经由一个电 阻器, 连接到上述多数个可控制发光二极管串中的最后一个可控制发光二极 管串的负端。 The device according to claim 6, wherein at least one of the plurality of controllable LED strings is controllable in the LED string, and each of the control switches is connected to the majority via a resistor. The last of the controllable LED strings can control the negative terminal of the LED string.
8. 如权利要求 1所述的装置, 其特征在于, 上述多数个切换单元中, 每 个切换单元有第一状态是将其领先的可控制发光二极管串和其尾随的可控 制发光二极管串形成并联, 第二状态是将其领先的可控制发光二极管串和其 尾随的可控制发光二极管串形成串联, 和第三状态将其领先的可控制发光二 极管串短路。 8. The apparatus according to claim 1, wherein each of the plurality of switching units has a first state in which a leading controllable LED string and a trailing controllable LED string are formed. Parallel, the second state is to connect its leading controllable LED string in series with its trailing controllable LED string, and the third state shorts its leading controllable LED string.
9.如权利要求 8所述的装置, 其特征在于, 上述多数个切换单元中, 每 个切换单元包含有第一并联开关, 第二并联开关, 和一串联幵关来达成上述 第一, 第二和第三状态; 该第一并联开关连接在其领先的可控制发光二极管 串的正端和其尾随的可控制发光二极管串的正端之间, 该第二并联开关连接 在其领先的可控制发光二极管串的负端和其尾随的可控制发光二极管串的 负端之间, 而该串联开关连接在其领先的可控制发光二极管串的负端和其尾 随的可控制发光二极管串的正端之间。 The device according to claim 8, wherein each of the plurality of switching units comprises a first parallel switch, a second parallel switch, and a series switch to achieve the first, the first a second and a third state; the first parallel switch is coupled between a positive end of its leading controllable LED string and a positive end of its trailing controllable LED string, the second parallel switch being coupled to its leading Controlling between the negative terminal of the LED string and the trailing end of its controllable LED string, and the series switch is coupled to the negative terminal of its leading controllable LED string and its trailing controllable LED string Between the ends.
10.如权利要求 9所述的装置, 其特征在于, 在上述第一状态中, 该第一 和第二并联开关都被接通, 该串联开关则被切断, 而使其领先的可控制发光 二极管串和其尾随的可控制发光二极管串的正端以及负端各别相连接; 在上 述第二状态中, 该第一和第二并联开关都被切断, 该串联幵关则被接通, 而 使其领先的可控制发光二极管串的负端和其尾随的可控制发光二极管串的 正端相连接; 而在上述第三状态中, 该第一并联开关被接通, 该第二并联开 关被切断,该串联开关则被接通,而使其领先的可控制发光二极管串被短路。 10. The apparatus of claim 9, wherein in the first state, the first and second parallel switches are both turned on, the series switch is turned off, and the leading controllable illumination is enabled The diode string and the trailing positive and negative terminals of the trailing controllable LED string are respectively connected; in the second state, the first and second parallel switches are cut off, and the series switch is turned on. And connecting the negative terminal of the leading controllable LED string to the positive terminal of the trailing controllable LED string; and in the third state, the first parallel switch is turned on, the second parallel switch When switched off, the series switch is turned "on" and its leading controllable LED string is shorted.
1 1.如权利要求 1所述的装置, 其特征在于, 上述控制器包含有一电压范 围检测单元发送上述并联连接信号和串联连接信号到上述多数个切换单元 的每一个切换单元, 一模拟至数字转换器将输入电源的电压值转换成数字信
号, 以及一状态机接收该数字信号和一从上述电压范围检测单元发送出的电 压范围信号并控制一逻辑电路, 使其发送出上述多数个发光二极管控制信 号, 到上述多数个可控制发光二极管串的每一个可控制发光二极管串。 1 1. The device according to claim 1, wherein the controller comprises a voltage range detecting unit that transmits the parallel connection signal and the serial connection signal to each of the plurality of switching units, an analog to digital The converter converts the voltage value of the input power source into a digital signal And a state machine receives the digital signal and a voltage range signal sent from the voltage range detecting unit and controls a logic circuit to transmit the plurality of light emitting diode control signals to the plurality of controllable light emitting diodes Each of the strings can control the string of LEDs.
12.如权利要求 1 1所述的装置, 其特征在于, 上述逻辑电路由存储记忆 器组成。 12. Apparatus according to claim 1 1 wherein said logic circuit is comprised of a memory.
13.如权利要求 1 1所述的装置, 其特征在于, 上述电流控制器为被上述 电压范围检测单元所控制的一电流源。 The apparatus according to claim 1, wherein said current controller is a current source controlled by said voltage range detecting unit.
14.如权利要求 1 1所述的装置, 其特征在于, 上述电流控制器为提供电 流感测信号给上述状态机的一电阻器。 14. Apparatus according to claim 1 1 wherein said current controller is a resistor for providing an electrical influenza test signal to said state machine.
15.—驱动多数个发光二极管串的装置, 其特征在于, 包括: 15. A device for driving a plurality of LED strings, characterized by comprising:
多数个可控制发光二极管串, 其中每个可控制发光二极管串有一正端, 一负端, 多数个发光二极管串联于上述正端和负端之间, 和多数个发光二极 管控制电路, 其中每一个发光二极管控制电路相对应于上述多数个发光二极 管中的一个发光二极管; A plurality of controllable LED strings, wherein each of the controllable LED strings has a positive terminal, a negative terminal, a plurality of LEDs connected in series between the positive terminal and the negative terminal, and a plurality of LED control circuits, each of which The LED control circuit corresponds to one of the plurality of LEDs;
多数个切换单元与上述多数个可控制发光二极管串交错连接, 其中每个 切换单元, 连接在一领先的可控制发光二极管串和一尾随的可控制发光二极 管串之间; a plurality of switching units are interleaved with the plurality of controllable LED strings, wherein each switching unit is connected between a leading controllable LED string and a trailing controllable LED string;
一输入电源连接到上述多数个可控制发光二极管串的第一个可控制发 光二极管串的正端; An input power source is coupled to the positive terminal of the first controllable light emitting diode string of the plurality of controllable LED strings;
一电流控制器其第一端连接到上述多数个可控制发光二极管串的最后 一个可控制发光二极管串的负端, 其第二端接地; a current controller having a first end connected to the negative end of the last controllable LED string of the plurality of controllable LED strings, the second end of which is grounded;
一切换电压比较单元接收上述输入电源的电压, 发送多数个共同信号, 到上述多数个可控制发光二极管串的每一个可控制发光二极管串, 以及一正 向传播信号到上述第一个可控制发光二极管串; 以及 a switching voltage comparison unit receives the voltage of the input power source, transmits a plurality of common signals, and controls each of the plurality of controllable LED strings to control the LED string, and a forward propagating signal to the first controllable illumination Diode string;
一电压范围检测单元发送一正向选择信号, 到上述多数个可控制发光二 极管串的每一个可控制发光二极管串, 以及一并联连接信号和一串联连接信 号到上述多数个切换单元的每一个切换单元。 a voltage range detecting unit transmits a forward selection signal to each of the plurality of controllable LED strings, and a switchable LED string, and a parallel connection signal and a serial connection signal to each of the plurality of switching units unit.
16.如权利要求 15所述的装置, 其特征在于, 上述多数个可控制发光二 极管串中, 最少有一个可控制发光二极管串有一个发光二极管, 没有相对应 的发光二极管控制电路。
The device according to claim 15, wherein at least one of the plurality of controllable LED strings has a light-emitting diode and no corresponding LED control circuit.
17.如权利要求 15所述的装置, 其特征在于, 上述多数个可控制发光二 极管串中, 最少有一个可控制发光二极管串中, 有一个电阻器, 连接在上述 多数个发光二极管与该可控制发光二极管串的负端之间。 The device according to claim 15, wherein at least one of the plurality of controllable light emitting diode strings has a controllable light emitting diode string, and a resistor is connected to the plurality of light emitting diodes and the Control between the negative ends of the LED strings.
18.如权利要求 15所述的装置, 其特征在于, 上述多数个可控制发光二 极管串中, 每一个可控制发光二极管串中的每一个发光二极管控制电路与相 对应的发光二极管并联。 18. Apparatus according to claim 15 wherein each of said plurality of controllable light emitting diode strings, each of said controllable light emitting diode strings, is coupled in parallel with a corresponding one of said light emitting diodes.
19.如权利要求 15所述的装置, 其特征在于, 上述多数个可控制发光二 极管串中, 每一个可控制发光二极管串中的每一个发光二极管控制电路, 连 接在相对应的发光二极管的正极端与该可控制发光二极管串中最后一个发 光二极管的负极端。 19. The apparatus according to claim 15, wherein each of said plurality of controllable light emitting diode strings is controllable for each of said light emitting diode control circuits, connected to the corresponding light emitting diodes. Extremely opposite to the negative terminal of the last LED in the controllable LED string.
20.如权利要求 15所述的装置, 其特征在于, 上述多数个可控制发光二 极管串中, 每一个可控制发光二极管串中的每一个发光二极管控制电路, 连 接在相对应的发光二极管的正极端与上述多数个可控制发光二极管串中的 最后一个可控制发光二极管串的负端。 The device according to claim 15, wherein each of the plurality of controllable light emitting diode strings is controllable, each of the light emitting diode control circuits is controlled to be connected to the corresponding light emitting diode. The extreme and the last of the plurality of controllable LED strings described above can control the negative terminal of the LED string.
21.如权利要求 20所述的装置, 其特征在于, 上述多数个可控制发光二 极管串中, 最少有一个可控制发光二极管串中, 每一个发光二极管控制电路 都经由一个电阻器, 连接到上述多数个可控制发光二极管串中的最后一个可 控制发光二极管串的负端。 The device according to claim 20, wherein at least one of the plurality of controllable LED strings is controlled in the LED string, and each of the LED control circuits is connected to the above via a resistor. The last of the plurality of controllable LED strings can control the negative terminal of the LED string.
22. 如权利要求 15所述的装置, 其特征在于, 上述多数个切换单元中, 每个切换单元有第一状态是将其领先的可控制发光二极管串和其尾随的可 控制发光二极管串形成并联, 第二状态是将其领先的可控制发光二极管串和 其尾随的可控制发光二极管串形成串联, 和第三状态将其领先的可控制发光 二极管串短路。 22. The apparatus according to claim 15, wherein each of the plurality of switching units has a first state in which a leading controllable LED string and a trailing controllable LED string are formed. Parallel, the second state is to connect its leading controllable LED string in series with its trailing controllable LED string, and the third state shorts its leading controllable LED string.
23.如权利要求 22所述的装置, 其特征在于, 上述多数个切换单元中, 每个切换单元包含有第一并联幵关, 第二并联开关, 和一串联开关来达成上 述第一, 第二和第三状态; 该第一并联开关连接在其领先的可控制发光二极 管串的正端和其尾随的可控制发光二极管串的正端之间, 该第二并联开关连 接在其领先的可控制发光二极管串的负端和其尾随的可控制发光二极管串 的负端之间, 而该串联开关连接在其领先的可控制发光二极管串的负端和其 尾随的可控制发光二极管串的正端之间。
The device according to claim 22, wherein each of the plurality of switching units includes a first parallel switch, a second parallel switch, and a series switch to achieve the first, the first a second and a third state; the first parallel switch is coupled between a positive end of its leading controllable LED string and a positive end of its trailing controllable LED string, the second parallel switch being coupled to its leading Controlling between the negative terminal of the LED string and the trailing end of its controllable LED string, and the series switch is coupled to the negative terminal of its leading controllable LED string and its trailing controllable LED string Between the ends.
24.如权利要求 23所述的装置, 其特征在于, 在上述第一状态中, 该第 一和第二并联开关都被接通, 该串联开关则被切断, 而使其领先的可控制发 光二极管串和其尾随的可控制发光二极管串的正端以及负端各别相连接; 在 上述第二状态中, 该第一和第二并联开关都被切断, 该串联开关则被接通, 而使其领先的可控制发光二极管串的负端和其尾随的可控制发光二极管串 的正端相连接; 而在上述第三状态中, 该第一并联开关被接通, 该第二并联 开关被切断, 该串联开关则被接通, 而使其领先的可控制发光二极管串被短 路。 24. The apparatus of claim 23, wherein in the first state, the first and second parallel switches are both turned "on", the series switch is turned off, and the leading controllable illumination is enabled The diode string and the trailing positive and negative terminals of the trailing controllable LED string are respectively connected; in the second state, the first and second parallel switches are cut off, and the series switch is turned on, and The negative terminal of the leading controllable LED string is connected to the positive terminal of the trailing controllable LED string; and in the third state, the first parallel switch is turned on, the second parallel switch is When switched off, the series switch is turned "on" and its leading controllable LED string is shorted.
25.如权利要求 15所述的装置, 其特征在于, 上述电流控制器为被上述 电压范围检测单元所控制的一电流源。 The apparatus according to claim 15, wherein said current controller is a current source controlled by said voltage range detecting unit.
26.如权利要求 15所述的装置, 其特征在于, 上述电流控制器为一电阻 器。 26. Apparatus according to claim 15 wherein said current controller is a resistor.
27.如权利要求 15所述的装置, 其特征在于, 上述多数个共同信号包含 一重置信号以重置上述多数个发光二极管控制电路, 一同步信号以使上述多 数个发光二极管控制电路同步切换,和一上 /下信号以显示上述输入电源的电 压值增高或减低。 27. The apparatus according to claim 15, wherein said plurality of common signals comprise a reset signal for resetting said plurality of LED control circuits, and a synchronization signal for synchronously switching said plurality of LED control circuits And an up/down signal to indicate that the voltage value of the above input power source is increased or decreased.
28.如权利要求 15所述的装置, 其特征在于, 上述切换电压比较单元包 含多数个电压比较器, 根据上述输入电源的电压值来产生上述正向传播信号 以及上述多数个共同信号。 The apparatus according to claim 15, wherein said switching voltage comparing means includes a plurality of voltage comparators for generating said forward propagation signal and said plurality of common signals based on a voltage value of said input power source.
29.如权利要求 15所述的装置, 其特征在于, 上述多数个发光二极管控 制电路的每一个发光二极管控制电路, 包含一个可将该发光二极管控制电路 内的一电路信道短路的开关组件。 29. Apparatus according to claim 15 wherein each of said plurality of LED control circuits comprises a switch assembly for shorting a circuit channel within said LED control circuit.
30.如权利要求 15所述的装置, 其特征在于, 上述多数个可控制发光二 极管串中, 每一个可控制发光二极管串之中, 又包含受上述正向选择信号控 的一正向多路转换器, 其中的每一个发光二极管控制电路接收一个正向输入 传播信号并发送出一个输出传播信号; 除了第一个发光二极管控制电路之 夕卜, 每一个发光二极管控制电路的正向输入传播信号, 其领先的发光二极管 控制电路的输出传播信号; 第一个发光二极管控制电路的正向输入传播信号 和最后一个发光二极管控制电路的输出传播信号, 经由该正向多路转换器而 输出一正向多路转换输出信号; 除了上述多数个可控制发光二极管串中的第
一个可控制发光二极管串之外, 每一个可控制发光二极管串的第一个发光二 极管控制电路的正向输入传播信号, 其领先的可控制发光二极管串输出的正 向多路转换输出信号, 而上述第一个可控制发光二极管串的第一个发光二极 管控制电路的正向输入传播信号是上述切换电压比较单元所发送的正向传 播信号。 30. The apparatus of claim 15, wherein each of the plurality of controllable LED strings is controllable within the LED string and further comprising a forward multi-channel controlled by the forward selection signal a converter, each of the LED control circuits receiving a forward input propagation signal and transmitting an output propagation signal; in addition to the first LED control circuit, the forward input propagation signal of each LED control circuit The output of the leading LED control circuit propagates the signal; the forward input propagation signal of the first LED control circuit and the output propagation signal of the last LED control circuit are outputted via the forward multiplexer To multiplexed output signals; in addition to the above-mentioned number of controllable LED strings A controllable LED string, each of which can control the forward input propagation signal of the first LED control circuit of the LED string, and its leading controllable LED string output forward multiplexed output signal, and The forward input propagation signal of the first LED control circuit of the first controllable LED string is the forward propagation signal transmitted by the switching voltage comparison unit.
31.如权利要求 30所述的装置, 其特征在于, 上述多数个可控制发光二 极管串中, 每一个可控制发光二极管串之中, 又包含受上述电压范围检测单 元发送的一反向选择信号控制的一反向多路转换器, 其中的每一个发光二极 管控制电路又接收一个反向输入传播信号; 除了最后一个发光二极管控制电 路之外, 每一个发光二极管控制电路的反向输入传播信号, 其随后的发光二 极管控制电路的输出传播信号; 最后一个发光二极管控制电路的反向输入传 播信号和第一个发光二极管控制电路的输出传播信号, 经由该反向多路转换 器而输出一反向多路转换输出信号; 除了上述多数个可控制发光二极管串中 的最后一个可控制发光二极管串之外, 每一个可控制发光二极管串的最后一 个发光二极管控制电路的反向输入传播信号, 其随后的可控制发光二极管串 输出的反向多路转换输出信号, 而上述最后一个可控制发光二极管串的最后 一个发光二极管控制电路的反向输入传播信号是上述切换电压比较单元所 发送的一反向传播信号。
31. The apparatus according to claim 30, wherein each of said plurality of controllable light emitting diode strings, each of said controllable LED strings, further comprising a reverse selection signal transmitted by said voltage range detecting unit a reverse multiplexer controlled, each of the LED control circuits receiving an inverted input propagation signal; in addition to the last LED control circuit, the reverse input of each LED control circuit propagates the signal, An output of the subsequent LED control circuit propagates a signal; an inverted input propagating signal of the last LED control circuit and an output propagating signal of the first LED control circuit, output a reverse via the inverse multiplexer Multiplexed output signal; in addition to the last controllable LED string of the plurality of controllable LED strings, each of which can control the reverse input propagation signal of the last LED control circuit of the LED string, which subsequently Controllable light emitting diode The reverse multiplexed output signal of the string output, and the reverse input propagation signal of the last LED control circuit of the last controllable LED string is a backpropagation signal sent by the switching voltage comparison unit.
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