CN110545604A - Light emitting diode driving device and control system - Google Patents
Light emitting diode driving device and control system Download PDFInfo
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- CN110545604A CN110545604A CN201910918564.6A CN201910918564A CN110545604A CN 110545604 A CN110545604 A CN 110545604A CN 201910918564 A CN201910918564 A CN 201910918564A CN 110545604 A CN110545604 A CN 110545604A
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Abstract
The present disclosure relates to a light emitting diode driving apparatus and a control system, the apparatus including: a panel; an indicator light and a control switch; a rectification filtering module; a light emitting module; the driving module is electrically connected with the rectifying and filtering module and the light-emitting module, the driving module comprises an indicator lamp control circuit, and the driving module is used for: and under the condition that the duration of the voltage output by the rectifying and filtering module is less than the first reference voltage and is greater than or equal to a duration threshold, controlling the indicator lamp control circuit to be started and controlling the light-emitting module to be switched off. The control circuit of the indicating lamp can control the indicating lamp control circuit to be started and controlled under the condition that the duration of the voltage output by the rectifying and filtering module is less than or equal to the duration threshold value of the first reference voltage, so that misjudgment of the conduction state of the control switch is avoided, the indicating lamp control circuit is started in a misway, the power consumption is reduced, and the electric energy is saved.
Description
Technical Field
the present disclosure relates to the field of driving technologies, and in particular, to a light emitting diode driving apparatus and a control system.
Background
there are various flush mounting plates of switch in the market, and the lamp is turned off after, can effectively find flush mounting plate of switch for the user of being convenient for, and some panels lean on surperficial phosphor powder to provide weak reflection of light, and little night-light of embedded LED of some panels, the closed little night-light of panel is not bright, and the little night-light of panel shutoff is bright, that is to say, little night-light is through response panel shutoff, whether closed state decides to light. However, the related art cannot accurately detect whether the panel is turned off, and often misjudgment of turning off the panel to turn on the small night lamp driving circuit is caused, thereby wasting electric energy.
Disclosure of Invention
in view of the above, the present disclosure provides a light emitting diode driving apparatus, including:
a panel;
The indicating lamp and the control switch are arranged on the panel, and the indicating lamp is connected with the control switch in parallel;
The rectification filtering module is electrically connected with the indicator light and the control switch and is used for rectifying and filtering the input alternating current;
A light emitting module;
the driving module is electrically connected with the rectifying and filtering module and the light-emitting module, the driving module comprises an indicator lamp control circuit, and the driving module is used for:
And under the condition that the duration of the voltage output by the rectifying and filtering module is less than the first reference voltage and is greater than or equal to a duration threshold, controlling the indicator lamp control circuit to be started and controlling the light-emitting module to be switched off.
In one possible embodiment, the driving module is further configured to: and under the condition that the voltage output by the rectifying and filtering module is greater than the first reference voltage or the duration that the voltage output by the rectifying and filtering module is less than the first reference voltage is less than the duration threshold, the indicator lamp control circuit is controlled to be switched off and the light-emitting module is controlled to be switched on.
in one possible embodiment, the drive module comprises:
One end of the comparator is used for receiving the voltage output by the rectifying and filtering module, and the other end of the comparator is used for inputting the first reference voltage;
a timing circuit electrically connected to the comparator for:
starting timing to obtain the duration when the comparator judges that the voltage output by the rectifying and filtering module is smaller than a first reference voltage;
under the condition that the duration is greater than or equal to the duration threshold, outputting a first control signal;
The indicating lamp control circuit is electrically connected to the timing circuit and used for being in a starting state and controlling the light emitting module to be turned off under the condition of receiving the first control signal.
in one possible implementation, the timing circuit is further configured to: outputting a second control signal under the condition that the duration is less than the duration threshold or the condition that the comparator judges that the voltage output by the rectifying and filtering module is greater than or equal to the first reference voltage;
The indicator light control circuit is further configured to be in a turn-off state and control the light emitting module to be turned on when the second control signal is received.
In one possible implementation, the timing circuit is further configured to:
And during timing, stopping timing under the condition that the voltage output by the rectifying and filtering module is greater than the first reference voltage or the time length is greater than or equal to the time length threshold value, and obtaining the time length.
In one possible implementation, the timing circuit includes a timer, a nand gate logic circuit, wherein:
The input end of the timer is electrically connected with the output end of the comparator, the first input end of the NAND gate logic circuit is electrically connected with the output end of the comparator, and the second input end of the NAND gate logic circuit is electrically connected with the output end of the timer.
in one possible embodiment, the indicator light control circuit includes a first transistor, a second transistor, a third resistor, a fourth resistor, and an operational amplifier, wherein:
The drain electrode of the first transistor is electrically connected to the rectifying and filtering module, the source electrode of the first transistor is electrically connected to the drain electrode of the second transistor and the first end of the fourth resistor, and the grid electrode of the first transistor is grounded;
The positive end of the operational amplifier is electrically connected to the first end of the third resistor and the second end of the fourth resistor, a second reference voltage is input to the negative end of the operational amplifier, the output end of the operational amplifier is electrically connected to the grid electrode of the second transistor, and the control end of the operational amplifier is electrically connected to the timing circuit;
the source of the second transistor is grounded, the second end of the third resistor is grounded,
wherein the first transistor comprises a Jfet transistor.
in a possible implementation manner, when the control terminal of the operational amplifier receives the first control signal and the voltage of the third resistor is close to the second reference voltage, the output terminal of the operational amplifier outputs a high-level signal and the second transistor is turned on.
in a possible implementation manner, the driving module further includes a light emitting diode driving circuit, a source of the first transistor is electrically connected to the light emitting diode driving circuit, when the control terminal of the operational amplifier receives the first control signal and the voltage of the third resistor is much smaller than the second reference voltage, an output terminal of the operational amplifier outputs a low level signal, the second transistor is turned off,
The source electrode of the first transistor is used for providing electric energy for the light-emitting diode driving circuit so as to maintain static power consumption.
In a possible implementation, in a case where the control terminal of the operational amplifier receives the second control signal, the output terminal of the operational amplifier outputs a low level signal, and the second transistor is turned off.
according to another aspect of the present disclosure, a control system is presented, the system comprising:
the light emitting diode driving device;
One or more than two light emitting diodes.
According to the LED lamp control circuit, under the condition that the duration of the voltage output by the rectifying and filtering module is less than or equal to the first reference voltage is greater than or equal to the duration threshold, the indicator lamp control circuit is controlled to be started and controlled to be turned off by the light emitting module, so that misjudgment of the conduction state of the control switch is avoided, and the indicator lamp control circuit is turned on by mistake. The effects of reducing power consumption and saving electric energy are achieved.
other features and aspects of the present disclosure will become apparent from the following detailed description of exemplary embodiments, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate exemplary embodiments, features, and aspects of the disclosure and, together with the description, serve to explain the principles of the disclosure.
fig. 1 illustrates a block diagram of a light emitting diode driving apparatus according to an embodiment of the present disclosure.
Fig. 2 shows a schematic diagram of a light emitting diode driving apparatus according to an embodiment of the present disclosure.
fig. 3 shows a schematic diagram of a rectified filter module output voltage according to an embodiment of the present disclosure.
fig. 4 shows a schematic diagram of a rectified filter module output voltage according to an embodiment of the present disclosure.
Detailed Description
Various exemplary embodiments, features and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. In the drawings, like reference numbers can indicate functionally identical or similar elements. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
the word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments.
Furthermore, in the following detailed description, numerous specific details are set forth in order to provide a better understanding of the present disclosure. It will be understood by those skilled in the art that the present disclosure may be practiced without some of these specific details. In some instances, methods, means, elements and circuits that are well known to those skilled in the art have not been described in detail so as not to obscure the present disclosure.
referring to fig. 1, fig. 1 is a block diagram illustrating an led driving apparatus according to an embodiment of the disclosure.
As shown in fig. 1, the apparatus includes:
A panel 10;
an indicator light and control switch 20 disposed on the panel 10, the indicator light and the control switch being connected in parallel;
the rectifying and filtering module 30 is electrically connected to the indicator light and the control switch 20 and is used for rectifying and filtering the input alternating current;
A light emitting module 50;
the driving module 40 is electrically connected to the rectifying and filtering module 30 and the light emitting module 50, the driving module includes an indicator lamp control circuit 401, and the driving module 40 is configured to:
When the duration that the voltage output by the rectifying and filtering module 30 is less than the first reference voltage is greater than or equal to the duration threshold, the indicator lamp control circuit 401 is controlled to be turned on and the light emitting module 50 is controlled to be turned off.
through the above device, this disclosure can be in under the condition that the length of time that the voltage of rectifying and filtering module 30 output is less than first reference voltage is greater than or equal to the length of time threshold, control pilot lamp control circuit 401 opens and control light emitting module 50 shuts off to avoid the misjudgment to control switch's conducting state, and open pilot lamp control circuit by mistake, reach the reduction power consumption, practice thrift the electric energy.
when the duration of the voltage output by the rectifying and filtering module 30 being less than the first reference voltage is greater than or equal to the duration threshold, the control switch may be considered to be in an off state, and in this case, the driving module 40 drives the indicator lamp control circuit to turn on (or called as start, turn on, active, etc.), and controls the light emitting module 50 to turn off.
in a possible embodiment, the driving module 40 may be further configured to: and under the condition that the voltage output by the rectifying and filtering module 30 is greater than the first reference voltage or the duration that the voltage output by the rectifying and filtering module 30 is less than the first reference voltage is less than the duration threshold, controlling the indicator lamp control circuit 401 to turn off and controlling the light emitting module 50 to turn on.
Under the condition that the voltage output by the rectifying and filtering module 30 is greater than the first reference voltage, or under the condition that the duration of the voltage output by the rectifying and filtering module 30 is less than the first reference voltage is less than the duration threshold, the control switch can be considered to be in a closed (on) state, and under the condition, the driving module 40 controls the indicator lamp control circuit 401 to be turned off and controls the light emitting module 50 to be turned on.
in a possible implementation manner, the first reference voltage may be determined according to actual conditions, and the size of the first reference voltage is not limited by the present disclosure.
In one example, the first reference voltage may be determined according to the magnitude of the voltage output by the rectifying and filtering module 30 when the control switch is in the closed state.
In one possible embodiment, the indicator light may be a light emitting diode LED, or other light emitting device, and the disclosure is not limited thereto.
In one possible embodiment, the control switch may be a single-pole double-throw switch or other type of switch, and the disclosure is not limited thereto.
In one possible embodiment, the light emitting module 50 may include a light emitting diode LED.
The various modules in the apparatus proposed in the present disclosure may have many different implementations, and the following describes possible implementations of the various modules.
referring to fig. 2, fig. 2 is a schematic diagram illustrating an led driving apparatus according to an embodiment of the disclosure.
In one possible embodiment, the indicator light and control switch 20 may include an indicator light LED1 and a control switch S. The positive terminal of the indicator light LED1 is electrically connected to the first terminal of the control switch S and can be used for inputting alternating current AC, and the negative terminal of the indicator light LED1 is electrically connected to the second terminal of the control switch S, therefore, the indicator light LED1 is connected in parallel with the control switch S, and when the control switch S is closed, the indicator light LED1 is not lit; with control switch S open, indicator light LED1 may be illuminated.
In a possible embodiment, the rectifying and filtering module 30 may include a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a capacitor C, a first resistor R1, and a second resistor R2, wherein a positive terminal of the first diode D1 is electrically connected to a parallel terminal of the indicator LED1 and the control switch S (a second terminal of the control switch S and a negative terminal of the indicator LED 1), and a negative terminal of the second diode D2, a positive terminal of the second diode D2 and a positive terminal of the fourth diode D4 are grounded, a negative terminal of the third diode D3 is electrically connected to a negative terminal of the first diode D1, a first terminal of the capacitor C, a first terminal of the second resistor R2, and a positive terminal of the third diode D3 is electrically connected to a negative terminal of the fourth diode D4 (for receiving AC);
A second end of the capacitor C is electrically connected to a positive terminal of the fourth diode D4 and a second end of the first resistor R1 (grounded);
A first end of the first resistor R1 is electrically connected to a second end of the second resistor R2;
The first end of the first resistor R1 is used for outputting the voltage VS output by the rectifying and filtering module 30.
the first diode D1, the second diode D2, the third diode D3, and the fourth diode D4 may be provided in the form of a rectifier bridge.
Of course, in other embodiments, the rectifier circuit may be other, for example, a transistor may be used instead of a diode, which is not limited in this disclosure.
In a possible implementation, the capacitor C may be used as an input capacitor (filter capacitor), and may filter the rectified voltage to remove glitches and interference.
It should be noted that the size of the capacitor C is not limited in the present disclosure, and those skilled in the art can select the capacitor C with an appropriate size according to actual needs. For example, the capacitor C may be selected according to the power consumption of the light emitting module 50, and if the power consumption of the light emitting module 50 is large, the capacitor C with a larger capacitance value may be selected, whereas if the power consumption of the light emitting module 50 is small, the capacitor C with a smaller capacitance value may be selected.
In one example, the capacitance C may be 4.7-12 μ f in size.
In one possible embodiment, the first resistor R1 and the second resistor R2 may form a voltage divider circuit, and the voltage VS across the first resistor R1 may be used as the voltage output by the rectifying-filtering module 30.
in one possible embodiment, as shown in fig. 2, the light emitting module 50 may include a fifth diode D5, an inductor L, and a light emitting diode LED2, wherein,
a negative terminal of the fifth diode D5 is electrically connected to the first terminal of the second resistor R2, the negative terminals of the first diode D1 and the second diode D2, and the positive terminal of the light emitting diode LED2, and a positive terminal of the fifth diode D5 is electrically connected to the first terminal of the inductor L and the driving module 40;
A second end of the inductor L is electrically connected to a negative terminal of the light emitting diode LED 2.
Of course, the rectifying and filtering module 30 and the light emitting module 50 are exemplarily described above, but it should be understood that other implementations of the rectifying and filtering module 30 and the light emitting module 50 are also possible.
in one possible embodiment, as shown in fig. 2, the driving module 40 may include:
A comparator COMP, one end of which is configured to receive the voltage VS output by the rectifying and filtering module 30, and the other end of which is configured to input the first reference voltage Vref 1;
A timing circuit electrically connected to the comparator COMP for:
Starting timing to obtain the duration when the comparator COMP judges that the voltage VS output by the rectifying and filtering module 30 is less than a first reference voltage Vref 1;
Under the condition that the duration is greater than or equal to the duration threshold, outputting a first control signal;
and the indicator light control circuit 401 is electrically connected to the timing circuit, and is configured to be in an on state and control the light emitting module 50 to turn off when receiving the first control signal.
in a possible implementation, as shown in fig. 2, the timing circuit may further be configured to: outputting a second control signal when the duration is less than the duration threshold or when the comparator COMP determines that the voltage VS output by the rectifying and filtering module 30 is greater than or equal to the first reference voltage Vref 1;
The indicator light control circuit 401 is further configured to be in an off state and the light emitting module 50 is turned on when receiving the second control signal, and in this case, the indicator light control circuit does not absorb current.
The indicator lamp control circuit 401 may receive the first control signal or the second control signal, and is in an on state or an off state under the control of the first control signal or the second control signal.
in one possible implementation, the timing circuit may be further configured to:
During the timing period, the timing is stopped when the voltage output by the rectifying and filtering module 30 is greater than the first reference voltage Vref1 or the duration is greater than or equal to the duration threshold, so as to obtain the duration.
in one possible implementation, the timing circuit may include a timer, a nand gate logic circuit nand, where:
The input end of the timer is electrically connected to the output end of the comparator COMP, the first input end of the NAND gate logic circuit nand is electrically connected to the output end of the comparator COMP, and the second input end of the NAND gate logic circuit nand is electrically connected to the output end of the timer.
It should be understood that although the timing circuit is described in the present disclosure by taking nand gate nand as an example, in other embodiments, nand gate nand may be replaced by an and gate or other types of logic circuits, and two different control signals (high level and low level) may be obtained according to the duration and the comparison result.
According to the invention, the voltage after the rectifier bridge is sampled through the first resistor R1 and the second resistor R2, the sampled voltage VS output by the rectifier filter module 30 is compared with the first reference voltage Vref1, and whether the control switch S is turned off or closed can be judged.
illustratively, if VS > Vref1, control switch S is illustrated as being closed at all times;
Illustratively, if VS < Vref1, the output of the comparator COMP goes high, the timing circuit in fig. 2 starts timing, and before timing is not completed (the duration is less than the duration threshold), if the voltage VS output by the rectifying and filtering module 30 rises and is greater than the first reference voltage Vref1, it is indicated that the control switch S is always closed;
Illustratively, if VS < Vref1, the comparator COMP output goes high, the timing circuit in fig. 2 starts timing, the timing is completed (the time duration is greater than or equal to the time duration threshold), and the voltage VS output by the rectifying and filtering module 30 is still less than the first reference voltage Vref1, which indicates that the control switch S is turned off.
In a possible embodiment, since the commercial power frequency is typically 50Hz or 60Hz, the frequency after the rectifier bridge is doubled and typically 100Hz or 120Hz, and the period is 8ms to 10ms, the duration threshold may be set to 10ms (ts).
Referring to fig. 3, fig. 3 is a schematic diagram illustrating an output voltage of a rectifying and filtering module according to an embodiment of the disclosure.
as shown in fig. 3, when the capacitor C has different sizes, the voltage waveform output by the rectifying and filtering module 30 may be different.
Normally, the control switch S is closed, the capacitance of the capacitor C after the rectifier bridge is limited, and each cycle has a valley, and the valley time is less than 10 mS. Once this valley time is greater than 10mS, it indicates that the control switch S has been opened.
the valley time may be any time between peak-to-peak in a cycle (less than cycle T). The trough time may be determined empirically and the disclosure is not limited.
in one example, when the time duration that the voltage VS output by the rectifying and smoothing module 30 is less than the first reference voltage Vref1 is greater than or equal to 10ms (time duration threshold), the timing circuit may output the first control signal, turn on the indicator lamp control circuit 401, turn on the indicator lamp LED1, and turn off the driving circuit of the light emitting diode LED 2.
Referring to fig. 4, fig. 4 is a schematic diagram illustrating an output voltage of a rectifying and filtering module according to an embodiment of the disclosure.
As shown in fig. 4, in one example, when the control switch S is closed, the valley time of the voltage VS output by the rectifying and filtering module 30 is always less than the duration threshold. Even if the comparator determines that the voltage VS is less than the first reference voltage Vref1, since the duration generated by the timer (the duration that the comparator determines that the voltage VS is less than the first reference voltage Vref 1) is less than the duration threshold, the circuit will determine that the control switch S is in the closed state, and thus the erroneous conduction of the indicator lamp control circuit 401 will not be caused, thereby saving the electric energy.
In one possible implementation, as shown in fig. 2, the indicator lamp control circuit 401 may include a first transistor Q1, a second transistor Q2, a third resistor R3, a fourth resistor R4, and an operational amplifier AMP, wherein:
The drain of the first transistor Q1 is electrically connected to the rectifier and filter module 30, the source of the first transistor Q1 is electrically connected to the drain of the second transistor Q2 and the first end of the fourth resistor R4, and the gate of the first transistor Q1 is grounded;
a positive terminal of the operational amplifier AMP is electrically connected to a first terminal of the third resistor R3 and a second terminal of the fourth resistor R4, a negative terminal of the operational amplifier AMP is inputted with a second reference voltage Vref2, an output terminal of the operational amplifier AMP is electrically connected to a gate of the second transistor Q2, and a control terminal of the operational amplifier AMP is electrically connected to the timer circuit;
The source of the second transistor Q2 is grounded, the second terminal of the third resistor R3 is grounded,
In one possible implementation, the first Transistor may include a Junction Field-Effect Transistor (JFET).
the present disclosure puts the first transistor in a conductive state by grounding the gate of the first transistor Q1.
In one possible implementation, the drain of the first transistor Q1 may be electrically connected to the first terminal of the second resistor, the negative terminal of the first diode D1, and the negative terminal of the third diode D3.
In one possible implementation, the drain of the first transistor Q1 may also be electrically connected to the negative terminal of the fifth diode D5 and the positive terminal of the light emitting diode LED 2.
In a possible implementation manner, when the control terminal of the operational amplifier AMP receives the first control signal and the voltage of the third resistor R3 is close to the second reference voltage Vref2, the output terminal of the operational amplifier AMP outputs a high level signal and the second transistor is turned on.
In the case where the voltages inputted to the two input terminals of the operational amplifier AMP are the same or close to each other, the operational amplifier AMP operates normally as an operational amplifier device.
in the case where the voltage difference between the two input terminals of the operational amplifier AMP is large, the operational amplifier AMP may operate as a comparator.
The present disclosure can realize control of the indicator LED1 according to the magnitude of the current flowing through the indicator LED1, using such a characteristic of the operational amplifier AMP.
In one possible embodiment, the driving module 40 may further include a light emitting diode driving circuit, which may be used to drive the light emitting diode LED 2. It should be noted that the light emitting diode LED2 may be considered a relatively powerful LED, such as an LED for room lighting, or an LED for other scene lighting. While indicator LED1 may be considered a relatively low power LED that emits a weak beam of light when energized.
It should be noted that the present disclosure is not limited to the specific implementation of the light emitting diode driving circuit of the light emitting diode LED2, and those skilled in the art can design or utilize the LED driving circuit in the related art as needed.
In one possible embodiment, the source of the first transistor Q1 may be electrically connected to the light emitting diode driving circuit (not shown), in a case where the control terminal of the operational amplifier AMP receives the first control signal and the voltage of the third resistor R3 is much smaller than the second reference voltage, the output terminal of the operational amplifier AMP outputs a low level signal, the second transistor Q2 is turned off, and the source of the first transistor Q1 may be used to provide power to the light emitting diode driving circuit to maintain static power consumption.
In the case that the control terminal of the operational amplifier AMP receives the first control signal and the voltage of the third resistor R3 is much smaller than the second reference voltage, the operational amplifier AMP may be regarded as a comparator, and since the voltage of the third resistor R3 is much smaller than the second reference voltage Vref2, the operational amplifier AMP outputs a low level to indicate that the lamp control circuit 401 does not work (to control the indicator light LED1 to turn off and the light emitting module 50 to turn on), in which case, the light emitting diode driving circuit receives a small current through the source of the first transistor Q1 to maintain static power consumption.
In one example, the current flowing through indicator light LED1 may be around 1mA, with the current required by the power module of the LED driver circuit being approximately 100 uA.
In one possible implementation, the present disclosure may provide the first transistor Q1 as a Jfet transistor, which may be regarded as a resistor due to its high voltage withstanding property. The present disclosure can save the starting resistance connected to the rectifying and smoothing module 30 (i.e., the first transistor Q1 is used as the starting resistance) by connecting the led driving circuit to the source of the first transistor Q1, thereby saving the cost and reducing the circuit area.
In a possible implementation, in a case where the control terminal of the operational amplifier AMP receives the second control signal, the output terminal of the operational amplifier AMP outputs a low level signal, and the second transistor Q2 is turned off.
In this way, the present disclosure may turn off the second transistor Q2 when the control switch is turned on and the timing circuit outputs the second control signal, so that the indicator lamp control circuit 401 does not operate, in which case the LED driving circuit drives the LED2 to emit light.
When the timing circuit outputs the first control signal, the lamp control circuit 401 is indicated to operate normally, which has been described previously, and belongs to the case where the control switch S is turned off. In this case, when the voltage of the third resistor R3 approaches the second reference voltage Vref2, there are two cases:
Case a, the current flowing through indicator LED1 is small:
the operational amplifier AMP outputs a high level signal, the second transistor Q2 is turned on, but because the current is small, the voltage across the third resistor R3 is small, the voltage signal output by the operational amplifier AMP is small, which results in a large junction resistance of the second transistor Q2, and at this time, a small current flows through the second transistor Q2, which indicates that the lamp control circuit 401 releases power;
In case B, the current flowing through the indicator LED1 is large:
The operational amplifier AMP outputs a high level signal, the second transistor Q2 is turned on, and because the small night light current is large, the voltage across the third resistor R3 is large, the voltage signal output by the operational amplifier AMP is high, resulting in a small junction resistance of the second transistor Q2, at which time a large current flows through the second transistor Q2, indicating that the lamp control circuit 401 is releasing power.
it can be seen that if the current passing through the indicator LED1 is larger than the absorption current of the driving circuit, the voltage of the JFET Source in fig. 2 increases, the voltage of the third resistor R3 increases, and the absorption current of the indicator control circuit 401 increases, and finally a dynamic balance is achieved. On the contrary, if the current passing through the indicator LED1 is smaller than the absorption current of the driving circuit, the JFET Source voltage in fig. 2 decreases, the voltage on the third resistor R3 decreases, the absorption current of the indicator control circuit 401 decreases, and finally a dynamic balance is achieved.
through the indicator light control circuit 401, the present disclosure can adaptively and dynamically adjust the current flowing through the Q1 according to the magnitude of the current flowing through the indicator light LED1, and thus, the light emitting diode driving circuit provided by the present disclosure can be adapted to different types of indicator light LEDs 1 (different operating currents of different types of indicator light LEDs 1).
according to the power-saving control circuit, the comparator and the timing circuit are adopted for double judgment, whether the control switch is disconnected or not can be accurately judged, and the indicating lamp control circuit 401 cannot be started under the condition that the control switch is closed, so that power consumption is reduced, and electric energy is saved.
In addition, the related art adopts a large number of high-voltage devices, and the high-voltage devices are not only implemented in a system but also integrated in a driving chip, so that the defect of high cost is caused. The light emitting diode driving device provided by the disclosure can only use one high-voltage device, namely a transistor (for example, 500V transistor), and is convenient to integrate into a driving chip, so that the hardware space is saved, and the application cost of the system is reduced. In the design of an actual driving chip, a 500V transistor can also be used as a starting resistor of the chip, an extra starting resistor of a system is not needed, the system design is simplified, and the cost is saved. When the control switch is turned off, the Jfet transistor can provide the working current of the driving chip, and when the control switch is turned off, the Jfet transistor can provide the maintaining current when the indicator light is turned on.
According to the device disclosed by the disclosure, in the case that the indicator lamp control circuit works, the indicator lamp control circuit can absorb the current value equal to the current flowing through the indicator lamp LED1 at any time.
also, according to various embodiments of the present disclosure, the present disclosure may detect whether the control switch is actually turned off. If the panel is truly disconnected, the indicator light control circuit is turned on, and the light-emitting diode LED2 for illumination and the light-emitting secondary light driving circuit are simultaneously turned off; if the control switch is not turned off, the indicator lamp control circuit is not turned on, and the light emitting diode LED2 for illumination and its driving circuit are always turned on.
If control switch is closed, but misjudge the disconnection, opened pilot lamp control circuit, pilot lamp control circuit can drop-down the electric current through control switch to lead to the waste of electric energy, this disclosure can the problem of solving, thereby practices thrift the electric energy.
having described embodiments of the present disclosure, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen in order to best explain the principles of the embodiments, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (11)
1. an led driving apparatus, comprising:
a panel;
The indicating lamp and the control switch are arranged on the panel, and the indicating lamp is connected with the control switch in parallel;
The rectification filtering module is electrically connected with the indicator light and the control switch and is used for rectifying and filtering the input alternating current;
A light emitting module;
The driving module is electrically connected with the rectifying and filtering module and the light-emitting module, the driving module comprises an indicator lamp control circuit, and the driving module is used for:
And under the condition that the duration of the voltage output by the rectifying and filtering module is less than the first reference voltage and is greater than or equal to a duration threshold, controlling the indicator lamp control circuit to be started and controlling the light-emitting module to be switched off.
2. the apparatus of claim 1, wherein the drive module is further configured to: and under the condition that the voltage output by the rectifying and filtering module is greater than the first reference voltage or the duration that the voltage output by the rectifying and filtering module is less than the first reference voltage is less than the duration threshold, controlling the indicator lamp control circuit to be switched off and controlling the light-emitting module to be switched on.
3. the apparatus of claim 1, wherein the drive module comprises:
one end of the comparator is used for receiving the voltage output by the rectifying and filtering module, and the other end of the comparator is used for inputting the first reference voltage;
A timing circuit electrically connected to the comparator for:
Starting timing to obtain the duration when the comparator judges that the voltage output by the rectifying and filtering module is smaller than a first reference voltage;
Under the condition that the duration is greater than or equal to the duration threshold, outputting a first control signal; the indicating lamp control circuit is electrically connected to the timing circuit and used for being in a starting state and controlling the light emitting module to be turned off under the condition of receiving the first control signal.
4. the apparatus of claim 3,
the timing circuit is further configured to: outputting a second control signal under the condition that the duration is less than the duration threshold or the condition that the comparator judges that the voltage output by the rectifying and filtering module is greater than or equal to the first reference voltage;
the indicator light control circuit is further configured to be in a turn-off state and control the light emitting module to be turned on when the second control signal is received.
5. the apparatus of claim 3 or 4, wherein the timing circuit is further configured to:
And during timing, stopping timing under the condition that the voltage output by the rectifying and filtering module is greater than the first reference voltage or the time length is greater than or equal to the time length threshold value, and obtaining the time length.
6. The apparatus of claim 3 or 4, wherein the timing circuit comprises a timer, a NAND gate logic circuit, wherein:
the input end of the timer is electrically connected with the output end of the comparator, the first input end of the NAND gate logic circuit is electrically connected with the output end of the comparator, and the second input end of the NAND gate logic circuit is electrically connected with the output end of the timer.
7. the apparatus of claim 4, wherein the indicator light control circuit comprises a first transistor, a second transistor, a third resistor, a fourth resistor, and an operational amplifier, wherein:
the drain electrode of the first transistor is electrically connected to the rectifying and filtering module, the source electrode of the first transistor is electrically connected to the drain electrode of the second transistor and the first end of the fourth resistor, and the grid electrode of the first transistor is grounded;
The positive end of the operational amplifier is electrically connected to the first end of the third resistor and the second end of the fourth resistor, a second reference voltage is input to the negative end of the operational amplifier, the output end of the operational amplifier is electrically connected to the grid electrode of the second transistor, and the control end of the operational amplifier is electrically connected to the timing circuit;
The source of the second transistor is grounded, the second end of the third resistor is grounded,
Wherein the first transistor comprises a Jfet transistor.
8. the apparatus of claim 7, wherein when the control terminal of the operational amplifier receives the first control signal and the voltage of the third resistor is close to the second reference voltage, the output terminal of the operational amplifier outputs a high signal and the second transistor is turned on.
9. the apparatus according to claim 7, wherein the driving module further comprises a light emitting diode driving circuit, the source of the first transistor is electrically connected to the light emitting diode driving circuit, the output terminal of the operational amplifier outputs a low level signal and the second transistor is turned off when the control terminal of the operational amplifier receives the first control signal and the voltage of the third resistor is much smaller than the second reference voltage,
The source electrode of the first transistor is used for providing electric energy for the light-emitting diode driving circuit so as to maintain static power consumption.
10. the apparatus of claim 7, wherein when the second control signal is received at the control terminal of the operational amplifier, the output terminal of the operational amplifier outputs a low signal and the second transistor is turned off.
11. A control system, characterized in that the system comprises:
a light emitting diode driving device as claimed in any one of claims 1 to 10;
one or more than two light emitting diodes.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910918564.6A CN110545604A (en) | 2019-09-26 | 2019-09-26 | Light emitting diode driving device and control system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910918564.6A CN110545604A (en) | 2019-09-26 | 2019-09-26 | Light emitting diode driving device and control system |
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