CN219305069U - Dimming chip, dimming control circuit and lighting equipment - Google Patents
Dimming chip, dimming control circuit and lighting equipment Download PDFInfo
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- CN219305069U CN219305069U CN202222665323.5U CN202222665323U CN219305069U CN 219305069 U CN219305069 U CN 219305069U CN 202222665323 U CN202222665323 U CN 202222665323U CN 219305069 U CN219305069 U CN 219305069U
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Abstract
The utility model discloses a dimming chip, a dimming control circuit and lighting equipment, wherein the dimming chip generates a PWM dimming signal by detecting a voltage value on a direct current bus and a peak current in a grounding loop of a light-emitting driving circuit, correlates the duty ratio of the PWM dimming signal with the voltage value on the direct current bus, and realizes brightness dimming of a lamp by identifying the change of the voltage value on the direct current bus (when the voltage value on the direct current bus is increased, the lamp increases brightness, otherwise, reduces brightness). Because the user can change the brightness of a plurality of lamps connected in series or in parallel on the direct current bus simultaneously by changing the voltage value on the direct current bus, communication control is not required to be carried out on each lamp independently, the operation is simple, and the user experience degree is high.
Description
Technical Field
The utility model relates to the technical field of lighting equipment, in particular to a dimming chip, a dimming control circuit and the lighting equipment.
Background
With the development of lighting technology, intelligent dimmable lighting products have been widely used. Referring to fig. 1, the dimming control circuit in the prior art needs to be externally connected with a special dimming signal module (or a dimming circuit or a dimmer) for receiving a dimming instruction of a user, and needs to add a digital control chip and software programming, so that the lighting dimming and the lamp product design become complex, and are easily affected by the node number limitation of a communication mode and the communication range.
Disclosure of Invention
The utility model aims to overcome the technical defects and provide a dimming chip, a dimming control circuit and lighting equipment, so as to solve the technical problem that in the related art, when a plurality of lamps need to be controlled simultaneously, communication control can only be carried out through a dimmer of each lamp, and the operation is complicated.
In order to achieve the technical purpose, the utility model adopts the following technical scheme:
according to a first aspect of the present utility model, there is provided a dimming chip connected to a light emitting driving circuit, comprising:
the comparison module is externally connected with a voltage dividing resistor and is used for detecting the voltage value on the direct current bus through the voltage dividing resistor and comparing the voltage value with the internal reference voltage;
the current feedback module is externally connected with a sampling resistor and is used for detecting peak current in a grounding loop of the light-emitting driving circuit through the sampling resistor;
and the generating module is used for generating PWM dimming signals with different duty ratios according to the comparison result output by the comparing module and the peak current output by the current feedback module, and outputting the PWM dimming signals to the light-emitting driving circuit.
Optionally, the generating module includes:
the first input end of the voltage signal processing module is connected with the comparison module, and the second input end of the voltage signal processing module is connected with the current feedback module and is used for generating dimming reference voltage according to the comparison result and the peak current;
the triangular wave signal module is used for generating triangular wave signals;
and the inverting input end of the comparator is connected with the voltage signal processing module, the non-inverting input end of the comparator is connected with the triangular wave signal module, the output end of the comparator is grounded through a grounding resistor and is used for comparing the dimming reference voltage with the triangular wave signal and generating a PWM dimming signal, and the duty ratio of the PWM dimming signal is related to the dimming reference voltage.
Optionally, the generating module further includes:
and the buffer is connected with the output end of the comparator and is used for buffering the PWM dimming signal output by the comparator.
Optionally, the generating module further includes:
the delay module is externally connected with a delay resistor and is used for generating a turn-off delay signal of the PWM dimming signal;
the reset end of the RS trigger is connected with the current feedback module, and the set end of the RS trigger is connected with the delay module and is used for outputting the level with the height being changed according to the turn-off delay signal and the peak current;
and the first input end of the AND gate is connected with the buffer, the second input end of the AND gate is connected with the output end of the RS trigger, and the output end of the AND gate is connected with the light-emitting driving circuit.
Optionally, the dimming chip includes:
the input end of the external divider resistor of the comparison module is packaged into a Vinv pin;
the grounding end of the grounding resistor is packaged into a GND pin;
the input end of the delay module is packaged into a Toff pin;
the output end of the AND GATE is packaged into a GATE pin;
and the input end of the current feedback module is packaged into a CS pin.
Optionally, the dimming chip further includes:
the VCC power supply module is used for supplying power to the dimming chip, and the input end of the VCC power supply module is packaged as a Vin end;
and the VDD voltage module is connected to the VCC power supply module 104, and is configured to provide an external power supply voltage, and an output terminal thereof is packaged as a VDD terminal.
According to a second aspect of the present utility model, there is provided a dimming control circuit connected to a light emitting element, comprising:
a light-emitting driving circuit and the light-adjusting chip;
the output end of the dimming chip is connected with the control end of the light-emitting driving circuit;
the output end of the light-emitting driving circuit is connected with the light-emitting element.
Optionally, the dimming control circuit further includes:
the divider resistor is connected between the direct current bus and the ground and is connected with a Vinv pin of the dimming chip;
the current limiting resistor is connected between the direct current bus and the Vin pin of the dimming chip;
the delay resistor is connected between the Toff pin of the dimming chip and the ground;
and the sampling resistor is arranged in a grounding loop of the light-emitting driving circuit and is simultaneously connected between a CS pin of the dimming chip and the ground.
Optionally, the light-emitting driving circuit includes:
the grid electrode of the field effect tube is connected with the GATE pin of the dimming chip, the drain electrode of the field effect tube is connected with the direct current bus through a reversely connected diode, and the source electrode of the field effect tube is grounded through the sampling resistor;
the light-emitting element is connected in series with an inductor and then connected in parallel with two ends of the diode.
Optionally, the voltage dividing resistor comprises a first resistor and a second resistor which are connected in series, and the Vinv pin of the dimming chip is connected between the first resistor and the second resistor.
Optionally, the dimming control circuit further includes:
and the direct current input filtering protection module is connected between the direct current source and the dimming chip and is used for filtering direct current output by the direct current source.
Optionally, the direct current input filtering protection module includes:
the protective tube is connected to the output end of the positive electrode of the direct current source;
the first filter capacitor, the common mode inductor and the second filter capacitor are connected in parallel with the two ends of the direct current source and the fuse tube;
and the positive diode is connected to a direct current bus for supplying power to the dimming chip by the direct current source.
According to a third aspect of the present utility model, there is provided a lighting device comprising:
the dimming control circuit.
The dimming chip, the dimming control circuit and the lighting equipment provided by the utility model generate the PWM dimming signal by detecting the voltage value on the direct current bus and the peak current in the grounding loop of the light-emitting driving circuit, correlate the duty ratio of the PWM dimming signal with the voltage value on the direct current bus, and realize the brightness dimming of the lamp by identifying the change of the voltage value on the direct current bus (when the voltage value on the direct current bus is increased, the lamp increases the brightness, otherwise, the brightness is reduced). Because the user can change the brightness of a plurality of lamps connected in series or in parallel on the direct current bus simultaneously by changing the voltage value on the direct current bus, communication control is not required to be carried out on each lamp independently, the operation is simple, and the user experience degree is high.
Drawings
Fig. 1 is a schematic block diagram of a dimming control circuit provided in the background of the utility model;
fig. 2 is a schematic block diagram of a dimming chip according to an embodiment of the present utility model;
fig. 3 is a schematic diagram of an internal circuit of a dimming chip according to an embodiment of the present utility model;
fig. 4 is a schematic block diagram of a dimming control circuit according to an embodiment of the present utility model;
fig. 5 is a schematic circuit diagram of a dimming control circuit according to an embodiment of the present utility model;
fig. 6 is a schematic block diagram of another dimming control circuit provided by an embodiment of the present utility model;
fig. 7 is a timing chart of a dimming waveform according to an embodiment of the present utility model.
Detailed Description
The present utility model will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present utility model more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.
As described in the foregoing background art, when a plurality of lamps need to be controlled simultaneously, the prior art can only perform communication control independently through the dimmer of each lamp, which is cumbersome to operate.
In order to effectively solve the problems in the related art, the present utility model provides a dimming chip, a dimming control circuit and a lighting device, which are described in detail below.
According to an embodiment of the present utility model, there is provided a dimming chip 100 connected to a light emitting driving circuit 200. Referring to fig. 2, the dimming chip 100 may include:
the comparison module 101 is externally connected with a voltage dividing resistor and is used for detecting the voltage value on the direct current bus through the voltage dividing resistor and comparing the voltage value with the internal reference voltage;
the current feedback module 102 is externally connected with a sampling resistor and is used for detecting peak current in a grounding loop of the light-emitting driving circuit 200 through the sampling resistor;
and the generating module 103 is configured to generate PWM dimming signals with different duty ratios according to the comparison result output by the comparing module and the peak current output by the current feedback module, and output the PWM dimming signals to the light-emitting driving circuit 200.
It should be noted that, the dimming chip 100 provided in this embodiment is connected to the light-emitting driving circuit 200 (the light-emitting driving circuit is connected to the light-emitting element and is used for driving the light-emitting element to emit light), and is suitable for use in a dimming control circuit, especially suitable for dimming a dc lighting system that relies on dc bus power supply. The dimming control circuit is used for providing dimming driving signals for various lamps, such as LED lamps.
The technical scheme provided by the embodiment is mainly used for receiving the direct current bus flexible scheduling response control. Taking a light-emitting element as a street lamp as an example, the brightness of the street lamp needs to be reduced in a certain period of time for saving energy, and the conventional scheme is that a control signal is transmitted to each lamp through a communication module and then converted into a dimming signal to realize brightness reduction. By adopting the technical scheme provided by the embodiment, the street lamp powered by the direct current bus does not need to communicate with each lamp independently, and the direct current bus voltage can be reduced directly through the AC/DC or DC/DC converter, so that the brightness of the lamps on the same direct current bus is reduced.
In specific practice, the comparison module 101 may employ a comparator a shown in fig. 2, where a non-inverting input terminal of the comparator a is connected to an internal reference voltage source, and an inverting input terminal of the comparator a is connected to a voltage dividing resistor. The comparator A detects the voltage value on the direct current bus through the voltage dividing resistor and compares the voltage value with the internal reference voltage provided by the internal reference voltage source.
It can be understood that, according to the technical scheme provided by the embodiment, the dimming chip generates the PWM dimming signal by detecting the voltage value on the dc bus and the peak current in the ground loop of the light-emitting driving circuit, correlates the duty ratio of the PWM dimming signal with the voltage value on the dc bus, and realizes the brightness dimming of the lamp by identifying the change of the voltage value on the dc bus (when the voltage value on the dc bus increases, the lamp increases brightness, otherwise, decreases brightness). Because the user can change the brightness of a plurality of lamps connected in series or in parallel on the direct current bus simultaneously by changing the voltage value on the direct current bus, communication control is not required to be carried out on each lamp independently, the operation is simple, and the user experience degree is high.
It should be noted that, the voltage value of the dc bus needs to be changed, and besides the dimming requirement of the user, the voltage value of the dc bus can be directly adjusted by playing a role of flexible load adjustment, receiving the schedule of the upper management system, for example, a certain period needs to reduce the loop lighting load by 10%, and the voltage value of the dc converter (the dc converter is generally arranged at the output end of the dc source, and the dc bus is led out from the dc converter) can be achieved without adding a communication module.
Referring to fig. 3, in specific practice, the generating module 103 includes:
the voltage signal processing module 1031 has a first input end connected to the comparing module 101 and a second input end connected to the current feedback module 102, and is configured to generate a dimming reference voltage according to the comparison result and the peak current;
a triangular wave signal module 1032 for generating a triangular wave signal;
and the inverting input end of the comparator 1033 is connected with the voltage signal processing module 1031, the non-inverting input end of the comparator 1033 is connected with the triangular wave signal module 1032, the output end of the comparator is grounded through a grounding resistor R0 and is used for comparing the dimming reference voltage with the magnitude of the triangular wave signal and generating a PWM dimming signal, and the duty ratio of the PWM dimming signal is related with the magnitude of the dimming reference voltage.
It will be appreciated that the magnitude of the dimming reference voltage determines the duty cycle of the PWM dimming signal, the larger the dimming reference voltage, the smaller the duty cycle.
When the voltage amplitude of the triangular wave signal is equal to or greater than the dimming reference voltage, the comparator 1033 outputs a high level; when the voltage amplitude of the triangular wave signal is smaller than the dimming reference voltage, the comparator 1033 outputs a low level, thereby generating a PWM dimming signal with a varying level.
In specific practice, the generating module 103 may further include:
and a buffer 1034 connected to the output end of the comparator 1033, for buffering the PWM dimming signal outputted from the comparator 1033.
It can be understood that the buffer 1034 mainly buffers the PWM dimming signal output by the comparator 1033, thereby improving the stability and driving capability of the signal and outputting an ideal digital signal.
In specific practice, the generating module 103 may further include:
the delay module 1035 is externally connected with a delay resistor and is used for generating a turn-off delay signal of the PWM dimming signal;
the reset end of the RS flip-flop 1036 is connected to the current feedback module 102, and the set end of the RS flip-flop is connected to the delay module 1035, and is used for outputting a level with a varying height according to the turn-off delay signal and the peak current;
and an and gate 1037 having a first input terminal connected to the buffer 1034, a second input terminal connected to an output terminal of the RS flip-flop 1036, and an output terminal connected to the light emission driving circuit.
It will be appreciated that this dimming chip provided in this embodiment is not just a PWM dimming signal generation chip. When the user does not have the dimming requirement, the LED constant current power supply driving chip also needs to output PWM signals to drive the field effect transistor Q1 in FIG. 5 to realize constant current control. In fig. 5, D1, L1, Q1 and D2 form a typical BUCK constant current circuit, to drive the light emitting element D2 to light up, and the magnitude of the current flowing through D2 is determined by the operating state of the fet Q1.
In specific practice, referring to fig. 5 (the chip U1 in fig. 5 is the dimming chip 100 mentioned in the foregoing embodiment), the input end of the external voltage dividing resistor of the comparison module is packaged as a Vinv pin;
the grounding end of the grounding resistor is packaged into a GND pin;
the input end of the delay module is packaged into a Toff pin;
the output end of the AND GATE is packaged into a GATE pin;
and the input end of the current feedback module is packaged into a CS pin.
In specific practice, the dimming chip 100 further comprises:
the VCC power supply module 104 is configured to supply power to the dimming chip, and an input end of the VCC power supply module is packaged as a Vin end;
and the VDD voltage module 105 is connected with the VCC power supply module 104 and is used for providing external power supply voltage, and the output end of the VDD voltage module is packaged as a VDD end.
For easy understanding, referring to fig. 3 and 5, the operation principle of the dimming chip 100 according to the present embodiment will be explained as follows: the Vin pin of the dimming chip 100 is input through an external current limiting resistor R3 to supply power for the dimming chip, so that the input of a wide voltage range (15-450V DC) can be realized; the Vinv pin is connected with an external voltage dividing resistor (the voltage dividing resistor comprises R1 and R2 which are connected in series) to detect the voltage value on the direct current bus, compare the voltage value with the reference voltage Vref in the dimming chip and output the comparison result to the voltage signal processing module 1031; meanwhile, the current feedback module 200 outputs the detected peak current to the voltage signal processing module 1031, and the voltage signal processing module 1031 generates a dimming reference voltage according to the comparison result and the peak current; and a comparator 1033 comparing the dimming reference voltage with the magnitude of the triangular wave signal and generating a PWM dimming signal, the duty ratio of which is related to the magnitude of the dimming reference voltage.
It can be appreciated that, the technical scheme that this embodiment provided, each components and parts in the chip of adjusting luminance mutually support, realize generating PWM dimming signal according to the voltage value on the direct current bus, chip internal structure is compact, reasonable in design, and the chip of adjusting luminance after the encapsulation can be applied to industrial production in batches, increases the integrated level of circuit, has simplified the design of dimming control circuit, has promoted circuit design efficiency.
According to an embodiment of the present utility model, there is provided a dimming control circuit 1 connected to a light emitting element. Referring to fig. 4, the dimming control circuit 1 may include:
the light-emitting driving circuit 200 and the dimming chip 100 described above;
the output end of the dimming chip 100 is connected with the control end of the light-emitting driving circuit 200;
the output end of the light-emitting driving circuit 200 is connected to the light-emitting element.
The light-emitting element includes, but is not limited to: light emitting diodes, LED lamp beads, LED lamp panels, LED lamp strips and the like can emit light and need light emitting elements driven by a light emitting driving circuit.
The technical scheme provided by the embodiment is particularly suitable for dimming a direct-current lighting system which depends on direct-current bus power supply. The dimming control circuit is used for providing dimming driving signals for various lamps (light emitting elements are arranged in the lamps), such as LED lamps.
The technical scheme provided by the embodiment is mainly used for receiving the direct current bus flexible scheduling response control. Taking a light-emitting element as a street lamp as an example, the brightness of the street lamp needs to be reduced in a certain period of time for saving energy, and the conventional scheme is that a control signal is transmitted to each lamp through a communication module and then converted into a dimming signal to realize brightness reduction. By adopting the technical scheme provided by the embodiment, the street lamp powered by the direct current bus does not need to communicate with each lamp independently, and the direct current bus voltage can be reduced directly through the AC/DC or DC/DC converter, so that the brightness of the lamps on the same direct current bus is reduced.
It can be understood that, according to the technical scheme provided by the embodiment, the dimming chip generates the PWM dimming signal by detecting the voltage value on the dc bus and the peak current in the ground loop of the light-emitting driving circuit, correlates the duty ratio of the PWM dimming signal with the voltage value on the dc bus, and realizes the brightness dimming of the lamp by identifying the change of the voltage value on the dc bus (when the voltage value on the dc bus increases, the lamp increases brightness, otherwise, decreases brightness). Because the user can change the brightness of a plurality of lamps connected in series or in parallel on the direct current bus simultaneously by changing the voltage value on the direct current bus, communication control is not required to be carried out on each lamp independently, the operation is simple, and the user experience degree is high.
It should be noted that, the voltage value of the dc bus needs to be changed, and besides the dimming requirement of the user, the voltage value of the dc bus can be directly adjusted by playing a role of flexible load adjustment, receiving the schedule of the upper management system, for example, a certain period needs to reduce the loop lighting load by 10%, and the voltage value of the dc converter (the dc converter is generally arranged at the output end of the dc source, and the dc bus is led out from the dc converter) can be achieved without adding a communication module.
In specific practice, referring to fig. 5, the dimming control circuit 1 further comprises:
the divider resistor is connected between the direct current bus and the ground and is connected with a Vinv pin of the dimming chip; referring to fig. 5, the voltage dividing resistor includes a first resistor R1 and a second resistor R2 connected in series, and the Vinv pin of the dimming chip is connected between the first resistor R1 and the second resistor R2.
The current limiting resistor R3 is connected between the direct current bus and the Vin pin of the dimming chip and used for limiting the current input into the dimming chip 100;
the delay resistor R4 is connected between the Toff pin of the dimming chip and the ground;
and the sampling resistor Rcs is arranged in a grounding loop of the light-emitting driving circuit and is connected between a CS pin of the dimming chip and the ground.
Referring to fig. 5, the light emitting driving circuit 200 includes:
the grid electrode of the field effect tube Q1 is connected with the GATE pin of the dimming chip, the drain electrode of the field effect tube Q1 is connected with the direct current bus through a reversely connected diode D1, and the source electrode of the field effect tube Q1 is grounded through the sampling resistor Rcs;
the light emitting element D2 is connected in series with an inductor L1 and then connected in parallel to two ends of the diode D1.
Referring to fig. 6, the dimming control circuit 1 further includes:
the dc input filtering protection module 300 is connected between the dc source and the dimming chip 100, and is configured to filter the dc output from the dc source.
Referring to fig. 5, the dc input filtering protection module 300 includes:
FUSE1 connected to the positive output end of the DC source;
the first filter capacitor C1, the common mode inductor L2 and the second filter capacitor C2 are connected in parallel at two ends of the direct current source and the FUSE 1;
and the diode D3 is connected to the direct current bus for supplying power to the dimming chip by the direct current source (the diode D3 mainly plays a role of direct current reverse connection protection).
For easy understanding, referring to fig. 3 and 5, the operation principle of the dimming control circuit provided in the present embodiment will be explained as follows:
after the direct current source is electrified, the dimming chip 100 realizes internal power supply and initialization through the current limiting resistor R3, the VDD pin of the dimming chip 100 outputs 5V (the dimming chip 100 can be externally connected with a plurality of thermistors and photoresistors through the VDD pin to provide temperature protection or photosensitive detection function), and the dimming chip can be suspended when not in use. The Vinv pin of the dimming chip 100 divides the voltage value on the dc bus through the first resistor R1 and the second resistor R2, and compares the voltage value with the internal reference voltage Vref (typically 2.5V). If the voltage value on the dc bus meets the voltage working range of the dimming chip 100, the GATE pin of the dimming chip 100 outputs a driving pulse, the Toff pin sets the GATE pin output pulse off time in each period through the delay resistor R4 (when the pulse is turned off, the capacitor in the delay module discharges through R4, the delay time is set through RC, and when the capacitor in the delay module discharges, the pulse is turned on again, the dimming chip 100 provided in this embodiment is preferably an LED constant current chip with fixed off time). The CS pin of the dimming chip 100 detects a peak current in a ground loop of the light emitting driving circuit through the sampling resistor Rcs. The diode D1, the inductor L1 and the field effect transistor Q1 form a typical BUCK BUCK constant current circuit, the LED D2 is driven to be lightened, and the current flowing through the LED D2 is determined by the working state of the field effect transistor Q1.
Fig. 7 is a timing chart of a dimming waveform, referring to fig. 7, when the dc bus is powered up, power is supplied at a rated voltage of U0, and at this time, the dimming chip 100 recognizes a normal bright area after detecting the voltage value on the dc bus, and the light emitting element outputs at the rated power without dimming; when the voltage value on the direct current bus rises to U2 at the time t0, the dimming chip 100 still recognizes a normal bright area and does not dim light; at the time t 1-t 2, the voltage value on the direct current bus is reduced to U1, the dimming chip 100 detects and identifies that the light enters a flexible dimming area, dimming is carried out according to the value of the U1, and the smaller the U1 is, the darker the brightness of the light-emitting element is; when the voltage is reduced below Umin at time t4, the dimming chip 100 enters an off mode, and the light emitting element does not output.
Illustrating: u0=48vdc, in order to meet the DC power quality requirement, the operating area voltage range of the dimming chip 100 is set to be: wmin=0.8u0, umax=1.05u0, i.e. the voltage range is 38.4-50.4V, the voltage range of the flexible dimming region is: 38.4-48V.
In addition, it should be noted that:
1) U2 has a value range between U0 and Umax, wherein Umax is generally set to be 1.05 times of U0, U2 is not a fixed value, and is more than or equal to U0, so that a normally bright area is indicated, and dimming is not needed.
2) U1 has a value range between U0 and Umin, and typically Umin is set to 0.8 times U0, U1 is also a variable value, the size of which corresponds to the duty ratio of the PWM dimming signal, U1 is reduced, the duty ratio is also reduced, and the brightness of the lamp is reduced.
It can be understood that, according to the technical scheme provided by the embodiment, the dimming chip generates the PWM dimming signal by detecting the voltage value on the dc bus and the peak current in the ground loop of the light-emitting driving circuit, correlates the duty ratio of the PWM dimming signal with the voltage value on the dc bus, and realizes the brightness dimming of the lamp by identifying the change of the voltage value on the dc bus (when the voltage value on the dc bus increases, the lamp increases brightness, otherwise, decreases brightness). Because the user can change the brightness of a plurality of lamps connected in series or in parallel on the direct current bus simultaneously by changing the voltage value on the direct current bus, communication control is not required to be carried out on each lamp independently, the operation is simple, and the user experience degree is high.
It should be noted that, the voltage value of the dc bus needs to be changed, and in addition to the dimming requirement of the user, the function of flexible load adjustment is also performed, and the voltage value output by the dc converter (the dc converter is generally disposed at the output end of the dc source, for example, behind the FUSE1 in fig. 5, and the dc bus is led out from the dc converter) can be directly adjusted by receiving the schedule of the upper management system, for example, the loop lighting load needs to be reduced by 10% in a certain period, and no additional communication module is needed.
According to an embodiment of the present utility model, there is provided a lighting apparatus including:
the dimming control circuit.
It can be understood that, in the technical scheme provided by the embodiment, since the lighting device includes the dimming control circuit, and the dimming control circuit includes the dimming chip, the dimming chip generates the PWM dimming signal by detecting the voltage value on the dc bus and the peak current in the ground loop of the light-emitting driving circuit, correlates the duty ratio of the PWM dimming signal with the voltage value on the dc bus, and implements the brightness dimming of the lamp by identifying the change of the voltage value on the dc bus (when the voltage value on the dc bus increases, the lamp increases the brightness; otherwise, decreases the brightness). Because the user can change the brightness of a plurality of lamps connected in series or in parallel on the direct current bus simultaneously by changing the voltage value on the direct current bus, communication control is not required to be carried out on each lamp independently, the operation is simple, and the user experience degree is high.
It should be noted that, the voltage value of the dc bus needs to be changed, and besides the dimming requirement of the user, the voltage value of the dc bus can be directly adjusted by playing a role of flexible load adjustment, receiving the schedule of the upper management system, for example, a certain period needs to reduce the loop lighting load by 10%, and the voltage value of the dc converter (the dc converter is generally arranged at the output end of the dc source, and the dc bus is led out from the dc converter) can be achieved without adding a communication module.
Of course, those skilled in the art will appreciate that implementing all or part of the above-described methods may be implemented by a computer program for instructing relevant hardware (e.g., a processor, a controller, etc.), where the program may be stored in a computer-readable storage medium, and where the program may include the steps of the above-described method embodiments when executed. The storage medium may be a memory, a magnetic disk, an optical disk, or the like.
The above-described embodiments of the present utility model do not limit the scope of the present utility model. Any other corresponding changes and modifications made in accordance with the technical idea of the present utility model shall be included in the scope of the claims of the present utility model.
Claims (13)
1. A dimming chip connected to a light emitting driving circuit, comprising:
the comparison module is externally connected with a voltage dividing resistor and is used for detecting the voltage value on the direct current bus through the voltage dividing resistor and comparing the voltage value with the internal reference voltage;
the current feedback module is externally connected with a sampling resistor and is used for detecting peak current in a grounding loop of the light-emitting driving circuit through the sampling resistor;
and the generating module is used for generating PWM dimming signals with different duty ratios according to the comparison result output by the comparing module and the peak current output by the current feedback module, and outputting the PWM dimming signals to the light-emitting driving circuit.
2. The dimming chip of claim 1, wherein the generation module comprises:
the first input end of the voltage signal processing module is connected with the comparison module, and the second input end of the voltage signal processing module is connected with the current feedback module and is used for generating dimming reference voltage according to the comparison result and the peak current;
the triangular wave signal module is used for generating triangular wave signals;
and the inverting input end of the comparator is connected with the voltage signal processing module, the non-inverting input end of the comparator is connected with the triangular wave signal module, the output end of the comparator is grounded through a grounding resistor and is used for comparing the dimming reference voltage with the triangular wave signal and generating a PWM dimming signal, and the duty ratio of the PWM dimming signal is related to the dimming reference voltage.
3. The dimming chip of claim 2, wherein the generating module further comprises:
and the buffer is connected with the output end of the comparator and is used for buffering the PWM dimming signal output by the comparator.
4. The dimming chip of claim 3, wherein the generation module further comprises:
the delay module is externally connected with a delay resistor and is used for generating a turn-off delay signal of the PWM dimming signal;
the reset end of the RS trigger is connected with the current feedback module, and the set end of the RS trigger is connected with the delay module and is used for outputting the level with the height being changed according to the turn-off delay signal and the peak current;
and the first input end of the AND gate is connected with the buffer, the second input end of the AND gate is connected with the output end of the RS trigger, and the output end of the AND gate is connected with the light-emitting driving circuit.
5. The dimmer chip as claimed in claim 4, comprising:
the input end of the external divider resistor of the comparison module is packaged into a Vinv pin;
the grounding end of the grounding resistor is packaged into a GND pin;
the input end of the delay module is packaged into a Toff pin;
the output end of the AND GATE is packaged into a GATE pin;
and the input end of the current feedback module is packaged into a CS pin.
6. The dimmer chip as claimed in any one of claims 1-5, further comprising:
the VCC power supply module is used for supplying power to the dimming chip, and the input end of the VCC power supply module is packaged as a Vin end;
and the VDD voltage module is connected with the VCC power supply module (104) and is used for providing external power supply voltage, and the output end of the VDD voltage module is packaged as a VDD end.
7. A dimming control circuit coupled to a light emitting element, comprising:
a light-emitting drive circuit and a light-adjusting chip according to any one of claims 1 to 6;
the output end of the dimming chip is connected with the control end of the light-emitting driving circuit;
the output end of the light-emitting driving circuit is connected with the light-emitting element.
8. The dimming control circuit of claim 7, further comprising:
the divider resistor is connected between the direct current bus and the ground and is connected with a Vinv pin of the dimming chip;
the current limiting resistor is connected between the direct current bus and the Vin pin of the dimming chip;
the delay resistor is connected between the Toff pin of the dimming chip and the ground;
and the sampling resistor is arranged in a grounding loop of the light-emitting driving circuit and is simultaneously connected between a CS pin of the dimming chip and the ground.
9. The dimming control circuit of claim 7, wherein the light-emitting drive circuit comprises:
the grid electrode of the field effect tube is connected with the GATE pin of the dimming chip, the drain electrode of the field effect tube is connected with the direct current bus through a reversely connected diode, and the source electrode of the field effect tube is grounded through the sampling resistor;
the light-emitting element is connected in series with an inductor and then connected in parallel with two ends of the diode.
10. The dimming control circuit of claim 8, wherein,
the voltage dividing resistor comprises a first resistor and a second resistor which are connected in series, and a Vinv pin of the dimming chip is connected between the first resistor and the second resistor.
11. A dimming control circuit as claimed in any one of claims 7 to 10, further comprising:
and the direct current input filtering protection module is connected between the direct current source and the dimming chip and is used for filtering direct current output by the direct current source.
12. The dimming control circuit of claim 11, wherein the dc input filter protection module comprises:
the protective tube is connected to the output end of the positive electrode of the direct current source;
the first filter capacitor, the common mode inductor and the second filter capacitor are connected in parallel with the two ends of the direct current source and the fuse tube;
and the positive diode is connected to a direct current bus for supplying power to the dimming chip by the direct current source.
13. A lighting device, comprising:
a dimming control circuit as claimed in any one of claims 7 to 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222665323.5U CN219305069U (en) | 2022-10-10 | 2022-10-10 | Dimming chip, dimming control circuit and lighting equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222665323.5U CN219305069U (en) | 2022-10-10 | 2022-10-10 | Dimming chip, dimming control circuit and lighting equipment |
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| Publication Number | Publication Date |
|---|---|
| CN219305069U true CN219305069U (en) | 2023-07-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222665323.5U Active CN219305069U (en) | 2022-10-10 | 2022-10-10 | Dimming chip, dimming control circuit and lighting equipment |
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| Country | Link |
|---|---|
| CN (1) | CN219305069U (en) |
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