CN115580957A - Dimming chip, dimming control circuit and lighting equipment - Google Patents
Dimming chip, dimming control circuit and lighting equipment Download PDFInfo
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- CN115580957A CN115580957A CN202211236054.9A CN202211236054A CN115580957A CN 115580957 A CN115580957 A CN 115580957A CN 202211236054 A CN202211236054 A CN 202211236054A CN 115580957 A CN115580957 A CN 115580957A
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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]
- H05B45/10—Controlling the intensity of the light
- H05B45/14—Controlling the intensity of the light using electrical feedback from LEDs or from LED modules
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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]
- H05B45/30—Driver circuits
- H05B45/32—Pulse-control circuits
- H05B45/325—Pulse-width modulation [PWM]
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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
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Abstract
The invention discloses a dimming chip, a dimming control circuit and lighting equipment. 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, each lamp does not need to be separately subjected to communication control, the operation is simple, and the user experience is high.
Description
Technical Field
The invention 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, a 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, needs to add a digital control chip and software program design, complicates lighting dimming and lamp product design, and is easily affected by node number limitation of a communication mode and a communication range.
Disclosure of Invention
The invention aims to overcome the technical defects and provide a dimming chip, a dimming control circuit and lighting equipment to solve the technical problems that in the related art, when a plurality of lamps need to be controlled simultaneously, communication control can be carried out only through a dimmer of each lamp, and the operation is complicated.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
according to a first aspect of the present invention, there is provided a dimming chip connected to a light emission driving circuit, including:
the comparison module is externally connected with a divider resistor and used for detecting a voltage value on the direct current bus through the divider resistor and comparing the voltage value with an internal reference voltage;
the current feedback module is externally connected with a sampling resistor and is used for detecting the peak current in the ground loop of the light-emitting drive 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:
a voltage signal processing module, a first input end of which is connected with the comparison module, and a second input end of which 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 a triangular wave signal;
and the comparator is connected with the voltage signal processing module at the inverting input end and the triangular wave signal module at the non-inverting input end, is grounded at the output end 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 to 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 used for generating a turn-off delay signal of the PWM dimming signal;
the RS trigger is connected with the current feedback module at a reset end and the delay module at a position end and is used for outputting a level with high and low changes 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 drive circuit.
Optionally, the dimming chip includes:
the input end of the comparison module, which is externally connected with the divider resistor, is packaged as a Vinv pin;
the grounding end of the grounding resistor is packaged as a GND pin;
the input end of the delay module is packaged as a Toff pin;
the output end of the AND GATE is packaged as a GATE pin;
and the input end of the current feedback module is packaged as 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 with the VCC power supply module 104 and used for providing external power supply voltage, and the output end of the VDD voltage module is packaged as a VDD end.
According to a second aspect of the present invention, there is provided a dimming control circuit connected to a light emitting element, comprising:
a light emitting drive circuit and the light adjusting chip;
the output end of the dimming chip is connected with the control end of the light-emitting drive circuit;
the output end of the light-emitting drive circuit is connected with the light-emitting element.
Optionally, the dimming control circuit further includes:
the voltage division 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 time delay resistor is connected between a 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 connected between the CS pin of the dimming chip and the ground.
Optionally, the light emitting driving circuit includes:
the grid electrode of the field effect transistor is connected with the GATE pin of the dimming chip, the drain electrode of the field effect transistor is connected with the direct current bus through a reversely connected diode, and the source electrode of the field effect transistor 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 includes a first resistor and a second resistor 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 dc input filter protection module includes:
the protective tube is connected to the positive electrode output end of the direct current source;
the first filter capacitor, the common mode inductor and the second filter capacitor are connected in parallel at two ends of the direct current source and the fuse tube;
and the 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 invention, there is provided a lighting device comprising:
the dimming control circuit is provided.
According to the dimming chip, the dimming control circuit and the lighting equipment, the dimming chip generates the PWM dimming signal by detecting the voltage value on the direct current bus and the peak current in the ground circuit of the light-emitting drive circuit, the duty ratio of the PWM dimming signal is related to the voltage value on the direct current bus, and the brightness dimming of the lamp is realized 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 brightness of the lamp is increased, and 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, each lamp does not need to be independently controlled in communication, the operation is simple, and the user experience is high.
Drawings
Fig. 1 is a schematic block diagram of a dimming control circuit provided in the background of the present invention;
fig. 2 is a schematic block diagram of a dimming chip provided in an embodiment of the present invention;
fig. 3 is a schematic diagram of an internal circuit of a dimming chip according to an embodiment of the present invention;
fig. 4 is a schematic block diagram of a dimming control circuit according to an embodiment of the present invention;
fig. 5 is a schematic circuit diagram of a dimming control circuit according to an embodiment of the present invention;
fig. 6 is a schematic block diagram of another dimming control circuit provided in an embodiment of the present invention;
fig. 7 is a timing diagram of a dimming waveform according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
As described in the 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 invention 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 invention, a dimming chip 100 is provided and 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 divider resistor and is used for detecting a voltage value on the direct current bus through the divider resistor and comparing the voltage value with an internal reference voltage;
the current feedback module 102 is externally connected with a sampling resistor, and is configured to detect a peak current in a ground loop of the light-emitting driving circuit 200 through the sampling resistor;
and a generating module 103, 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 to drive the light-emitting element to emit light), and is suitable for dimming control circuit, especially suitable for dimming of a dc lighting system depending 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 response control of the flexible dispatching of the direct current bus. Taking a light emitting element as an example of a street lamp, in order to save energy in a certain period of time, the brightness of the street lamp needs to be reduced, and in a conventional scheme, 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 can directly reduce the voltage of the direct current bus through the AC/DC or DC/DC converter, so that the brightness of the lamps on the same direct current bus is reduced.
In a specific implementation, the comparing module 101 may adopt 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 externally connected to a voltage dividing resistor. The comparator A detects the voltage value on the direct current bus through the divider resistor, and compares the voltage value with the internal reference voltage provided by the internal reference voltage source.
It can be understood that, in the technical solution provided in this 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, associates the duty ratio of the PWM dimming signal with the voltage value on the dc bus, and implements brightness dimming on the lamp by identifying the change in the voltage value on the dc bus (when the voltage value on the dc bus increases, the lamp increases brightness, and vice versa, the brightness decreases). 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, each lamp does not need to be separately subjected to communication control, the operation is simple, and the user experience is high.
It should be noted that, the voltage value of the dc bus needs to be changed, which plays a role of flexible load adjustment besides the dimming requirement of the user, and receives the scheduling of the upper management system, for example, the lighting load of the loop needs to be reduced by 10% in a certain period, and the direct adjustment of the voltage value output by 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 implemented without adding a communication module.
Referring to fig. 3, in particular practice, the generating module 103 includes:
a voltage signal processing module 1031, a first input end of which is connected to the comparing module 101, and a second input end of which is connected to the current feedback module 102, and 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 a comparator 1033 having an inverting input terminal connected to the voltage signal processing module 1031 and a non-inverting input terminal connected to the triangle wave signal module 1032, and an output terminal grounded via a ground resistor R0, for comparing the dimming reference voltage with the magnitude of the triangle wave signal and generating a PWM dimming signal, where the duty ratio of the PWM dimming signal is related to the magnitude of the dimming reference voltage.
It is understood that the magnitude of the dimming reference voltage determines the duty cycle of the PWM dimming signal, and the larger the dimming reference voltage, the smaller the duty cycle.
When the voltage amplitude of the triangular wave signal is greater than or equal to 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 high-low variation.
In a specific practice, the generating module 103 may further include:
a buffer 1034 connected to the output terminal of the comparator 1033, and configured to buffer the PWM dimming signal output by the comparator 1033.
It can be understood that the buffer 1034 mainly buffers the PWM dimming signal output by the comparator 1033, so as to improve the stability and driving capability of the signal and output an ideal digital signal.
In a specific practice, the generating module 103 may further include:
a delay module 1035, externally connected with a delay resistor, for generating a turn-off delay signal of the PWM dimming signal;
an RS flip-flop 1036 having a reset terminal connected to the current feedback module 102 and a set terminal connected to the delay module 1035, and configured to output a level with a high/low variation according to the turn-off delay signal and the peak current;
and a and gate 1037 having a first input terminal connected to the buffer 1034, a second input terminal connected to the output terminal of the RS flip-flop 1036, and an output terminal connected to the light emission driving circuit.
It is understood that the dimming chip provided in the present embodiment is not only a PWM dimming signal generation chip. When the user does not have the dimming requirement, the LED constant-current power supply driving chip is also used for driving the field-effect tube Q1 in the figure 5 by outputting a PWM signal externally, so that the constant-current control is realized. In fig. 5, D1, L1, Q1 and D2 constitute a typical BUCK constant current circuit, which drives 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 above embodiment), the input end of the comparison module, which is externally connected to the voltage dividing resistor, is packaged as a Vinv pin;
the grounding end of the grounding resistor is packaged as a GND pin;
the input end of the delay module is packaged into a Toff pin;
the output end of the AND GATE is encapsulated into a GATE pin;
and the input end of the current feedback module is packaged as a CS pin.
In a specific practice, the dimming chip 100 further includes:
the VCC power supply module 104 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 105 is connected with the VCC power supply module 104 and used for providing external power supply voltage, and the output end of the VDD voltage module is packaged as a VDD end.
For ease of understanding, referring to fig. 3 and 5, the operation principle of the dimming chip 100 provided in the present embodiment will now be explained as follows: the Vin pin of the dimming chip 100 is input through an external current-limiting resistor R3 to supply power to the dimming chip, so that wide voltage range (15-450V DC) input can be realized; the Vinv pin detects the voltage value on the direct current bus through an external divider resistor (the divider resistor comprises R1 and R2 which are connected in series), and the voltage value is compared with the internal reference voltage Vref of the dimming chip, and the comparison result is output 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 the dimming reference voltage according to the comparison result and the peak current; a comparator 1033 comparing the dimming reference voltage with a magnitude of the triangular wave signal and generating a PWM dimming signal having a duty ratio related to the magnitude of the dimming reference voltage.
It can be understood that, the technical scheme that this embodiment provided, each inside components and parts of chip of adjusting luminance mutually support, realize generating PWM according to the magnitude of voltage on the direct current generating line signal of adjusting luminance, and chip inner 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 adjusting luminance control circuit, has promoted circuit design efficiency.
According to an embodiment of the present invention, 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:
a light emitting driving circuit 200 and the dimming chip 100;
the output end of the dimming chip 100 is connected to the control end of the light-emitting driving circuit 200;
the output terminal of the light-emitting driving circuit 200 is connected to the light-emitting element.
The light-emitting element includes, but is not limited to: the LED lamp comprises light-emitting elements which can emit light and need to be driven by a light-emitting drive circuit, such as a light-emitting diode, an LED lamp bead, an LED lamp panel and an LED lamp strip.
The technical scheme provided by the embodiment is particularly suitable for dimming of the direct-current lighting system depending on the 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 response control of the flexible dispatching of the direct current bus. Taking a light emitting element as an example of a street lamp, in order to save energy in a certain period of time, the brightness of the street lamp needs to be reduced, and in a conventional scheme, 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 can directly reduce the voltage of the direct current bus 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, in the technical solution provided in this 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, associates the duty ratio of the PWM dimming signal with the voltage value on the dc bus, and implements brightness dimming on the lamp by identifying the change in the voltage value on the dc bus (when the voltage value on the dc bus increases, the lamp increases brightness, and vice versa, the brightness decreases). 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, each lamp does not need to be independently controlled in communication, the operation is simple, and the user experience is high.
It should be noted that, the voltage value of the dc bus needs to be changed, in addition to the dimming requirement of the user, the voltage value of the dc bus also plays a role of flexible load adjustment, and the voltage value output by the dc converter (the dc converter is generally disposed at the output end of the dc source, and the dc bus is led out from the dc converter) can be directly adjusted by receiving the scheduling of the upper management system, for example, the lighting load of the loop needs to be reduced by 10% in a certain period of time, and no additional communication module is needed.
In specific practice, referring to fig. 5, the dimming control circuit 1 further includes:
the voltage division 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 a Vin pin of the dimming chip and is used for limiting the current input into the dimming chip 100;
the time 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 emission driving circuit 200 includes:
a grid electrode of the field effect transistor Q1 is connected with a GATE pin of the dimming chip, a drain electrode of the field effect transistor Q1 is connected with a direct current bus through a reverse diode D1, and a source electrode of the field effect transistor 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 filter protection module 300 is connected between the dc source and the dimming chip 100, and is configured to filter the dc power output by the dc source.
Referring to fig. 5, the dc input filter protection module 300 includes:
the FUSE1 is connected to the positive output end of the direct current source;
the first filter capacitor C1, the common mode inductor L2 and the second filter capacitor C2 are connected to two ends of the direct current source and the FUSE1 in parallel;
and the diode D3 which is connected in the positive direction is connected to a direct current bus which supplies power to the dimming chip by the direct current source (the diode D3 mainly plays a role in direct current reverse connection protection).
For ease of understanding, referring to fig. 3 and 5, the operation principle of the dimming control circuit provided in the present embodiment will now be explained as follows:
after the direct current source is powered on, 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 some thermistors and photoresistors through the VDD pin to provide a temperature protection function or a photosensitive detection function), and the dimming chip can be suspended when not used. 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, and the Toff pin sets the GATE pin output pulse turn-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 the RC, and when the capacitor in the delay module discharges, the pulse turns on again; the dimming chip 100 provided in this embodiment is preferably an LED constant current chip with fixed turn-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 voltage reduction constant current circuit, the light emitting diode D2 is driven to light, and the size of current flowing through the 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 on, the U0 rated voltage value is used for supplying power, at this time, the dimming chip 100 detects the voltage value on the dc bus and then recognizes the voltage value as a normally bright area, and the light emitting element outputs at the rated power without dimming; when the voltage value on the direct current bus is increased to be U2 at the moment of t0, the dimming chip 100 still recognizes a normally bright area and does not dim; at the time of 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 voltage enters the flexible dimming area, dimming is performed according to the value of U1, and the smaller U1 is, the darker the brightness of the light-emitting element is; when the voltage drops below Umin at time t4, the dimming chip 100 enters the off mode, and the light emitting element has no output.
For example, the following steps are carried out: u0=48V DC, in order to meet the DC supply quality requirement, the voltage range of the working area of the dimming chip 100 is set as: umin =0.8 × u0, umax =1.05 × u0, i.e. the voltage range is 38.4 to 50.4V, and the flexible dimming voltage range is: 38.4-48V.
In addition, it should be noted that:
1) The value range of U2 is between U0 and Umax, and generally Umax sets up 1.05 times of U0, and U2 is not a fixed value, and U0 more than or equal to indicates the normal bright area, does not need to adjust luminance.
2) The value range of U1 is between U0 and Umin, and general Umin sets up to 0.8 times of U0, and U1 is also a changeable value, and its size corresponds the duty cycle of PWM dimming signal, and U1 reduces, and duty cycle also reduces, and lamps and lanterns luminance reduces.
It can be understood that, in the technical solution provided in this 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, associates the duty ratio of the PWM dimming signal with the voltage value on the dc bus, and implements brightness dimming on the lamp by identifying the change in the voltage value on the dc bus (when the voltage value on the dc bus increases, the lamp increases brightness, and vice versa, the brightness decreases). 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, each lamp does not need to be separately subjected to communication control, the operation is simple, and the user experience is high.
It should be noted that, the voltage value of the dc bus needs to be changed, in addition to the dimming requirement of the user, the voltage value of the dc bus also plays a role of flexible load adjustment, and receives the schedule of the upper management system, for example, the lighting load of the loop needs to be reduced by 10% in a certain period, and the voltage value output by the dc converter (the dc converter is generally arranged 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, without adding a communication module.
According to an embodiment of the present invention, there is provided an illumination apparatus including:
the dimming control circuit is provided.
It can be understood that, in the technical solution provided in this embodiment, since the lighting device includes the dimming control circuit described above, and the dimming control circuit includes the dimming chip described above, and 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, associates the duty ratio of the PWM dimming signal with the voltage value on the dc bus, and implements brightness dimming on the lamp by recognizing the voltage value change on the dc bus (when the voltage value on the dc bus increases, the lamp increases brightness, and vice versa, the brightness decreases). 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, each lamp does not need to be separately subjected to communication control, the operation is simple, and the user experience is high.
It should be noted that, the voltage value of the dc bus needs to be changed, which plays a role of flexible load adjustment besides the dimming requirement of the user, and receives the scheduling of the upper management system, for example, the lighting load of the loop needs to be reduced by 10% in a certain period, and the direct adjustment of the voltage value output by 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 implemented without adding a communication module.
Of course, it will be understood by those skilled in the art that all or part of the processes of the methods of the above embodiments may be implemented by a computer program instructing relevant hardware (such as a processor, a controller, etc.), and the program may be stored in a computer readable storage medium, and when executed, the program may include the processes of the above method embodiments. The storage medium may be a memory, a magnetic disk, an optical disk, etc.
The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.
Claims (13)
1. A dimming chip connected to a light emitting driving circuit, comprising:
the comparison module is externally connected with a divider resistor and used for detecting a voltage value on the direct current bus through the divider resistor and comparing the voltage value with an internal reference voltage;
the current feedback module is externally connected with a sampling resistor and is used for detecting the peak current in the ground loop of the light-emitting drive 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 comparison 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 generating module comprises:
a voltage signal processing module, a first input end of which is connected with the comparison module, and a second input end of which 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 a triangular wave signal;
and the comparator is connected with the voltage signal processing module at the inverting input end, connected with the triangular wave signal module at the non-inverting input end and grounded at the output end through a grounding resistor, and used for comparing the dimming reference voltage with the triangular wave signal and generating a PWM dimming signal, wherein 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 to 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 generating 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 position end of the RS trigger is connected with the delay module and used for outputting a level with high and low change 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 drive circuit.
5. The dimming chip of claim 4, comprising:
the input end of the comparison module, which is externally connected with the divider resistor, is packaged as a Vinv pin;
the grounding end of the grounding resistor is packaged as a GND pin;
the input end of the delay module is packaged as a Toff pin;
the output end of the AND GATE is encapsulated into a GATE pin;
and the input end of the current feedback module is packaged as a CS pin.
6. The dimming chip according to any one of claims 1 to 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 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 connected to a light emitting element, comprising:
a light emission driving circuit and the light control 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 drive circuit;
the output end of the light-emitting drive circuit is connected with the light-emitting element.
8. The dimming control circuit of claim 7, further comprising:
the voltage division 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 a Vin pin of the dimming chip;
the time delay resistor is connected between a 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 lighting driver circuit comprises:
the grid electrode of the field effect transistor is connected with the GATE pin of the dimming chip, the drain electrode of the field effect transistor is connected with the direct current bus through a reversely connected diode, and the source electrode of the field effect transistor 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,
the voltage division 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. The dimming control circuit according to 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 positive electrode output end of the direct current source;
the first filter capacitor, the common mode inductor and the second filter capacitor are connected in parallel at two ends of the direct current source and the fuse tube;
and the diode is connected to a direct current bus for supplying power to the dimming chip by the direct current source.
13. An illumination 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 |
|---|---|---|---|
| CN202211236054.9A CN115580957A (en) | 2022-10-10 | 2022-10-10 | Dimming chip, dimming control circuit and lighting equipment |
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| CN202211236054.9A CN115580957A (en) | 2022-10-10 | 2022-10-10 | Dimming chip, dimming control circuit and lighting equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024169669A1 (en) * | 2023-02-14 | 2024-08-22 | 北京模电半导体有限公司 | Controller integrated circuit and energy storage lighting fixture |
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2022
- 2022-10-10 CN CN202211236054.9A patent/CN115580957A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024169669A1 (en) * | 2023-02-14 | 2024-08-22 | 北京模电半导体有限公司 | Controller integrated circuit and energy storage lighting fixture |
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