CN109309993B - Loop dimming circuit for intelligent illumination - Google Patents
Loop dimming circuit for intelligent illumination Download PDFInfo
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- CN109309993B CN109309993B CN201811367563.9A CN201811367563A CN109309993B CN 109309993 B CN109309993 B CN 109309993B CN 201811367563 A CN201811367563 A CN 201811367563A CN 109309993 B CN109309993 B CN 109309993B
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- 238000005286 illumination Methods 0.000 title claims abstract description 10
- 238000012544 monitoring process Methods 0.000 claims abstract description 16
- 239000003990 capacitor Substances 0.000 claims description 18
- 230000000087 stabilizing effect Effects 0.000 claims description 12
- 238000000034 method Methods 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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
- H05B45/37—Converter circuits
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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
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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]
- H05B45/50—Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDs; responsive to LED life; Protective circuits
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/40—Control techniques providing energy savings, e.g. smart controller or presence detection
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- Circuit Arrangement For Electric Light Sources In General (AREA)
Abstract
The invention discloses a loop dimming circuit for intelligent illumination, which is connected between an input power supply and an LED illumination system and comprises a voltage monitoring unit, a dimming micro-control unit and a PWM signal-to-current dimming unit; the voltage monitoring unit is used for monitoring the input voltage of the input power supply; the dimming micro-control unit is used for outputting PWM signals for controlling the PWM signal-to-current dimming unit according to the change value of the input voltage; the PWM signal-to-current dimming unit is used for adjusting input current loaded on the LED lighting system according to the PWM signal. The loop dimming circuit is suitable for loop dimming of the LED modules of the intelligent lighting system, loop light balancing of the LED modules in the area of the intelligent lighting system, and the dimming process and the light balancing process are not influenced by fluctuation of an input power supply, so that constant current source dimming and light balancing are realized.
Description
Technical Field
The invention belongs to the technical field of intelligent illumination, and particularly relates to a loop dimming circuit for intelligent illumination.
Background
Along with the rapid development of electronic technology, the LED lamp products gradually move to intelligence, and the LED lamp with the dimming function is increasingly widely applied for achieving the purposes of saving electricity, controlling scene light and the like.
At present, an widely applied LED dimming technology is a PWM technology, the characteristics that human eyes are insensitive to high-frequency flicker and sensitive to brightness are accumulated are utilized, the LED light source is controlled to be on or off through PWM signals, the duty ratio of the PWM signals is adjusted to adjust the lighting time of the LED light source, when the duty ratio of the PWM signals is increased, the lighting time of the LED light source in one period is prolonged, and the brightness perceived by human eyes is increased; conversely, when the duty ratio of the PWM signal becomes smaller, the time for the LED light source to turn on in one period becomes shorter, and the brightness perceived by the human eye becomes smaller, thereby realizing dimming.
In the existing dimming technology, because the precision requirement of dimming is not high, or because of the current technical constraint, the current loaded on the LED module after dimming is easily influenced by the fluctuation of an input power supply, and the dimming technology is restricted to develop towards a higher precision direction.
On the other hand, in loop dimming of a power system, a plurality of LED modules in one area are connected in series on an input power supply, and after power-on, current of each LED module in the same area can be sequentially reduced along with access of a load, so that brightness of each LED module in one area is uneven, on one hand, the lighting effect is influenced, and on the other hand, the service life of each LED module is influenced.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a loop dimming circuit which is suitable for loop dimming of an LED module of an intelligent lighting system, is also suitable for loop light balancing of the LED module in a region of the intelligent lighting system, and realizes constant current source dimming and light balancing in the dimming process and the light balancing process without being influenced by fluctuation of an input power supply.
In order to solve the technical problems, the invention provides a loop dimming circuit for intelligent illumination, which is connected between an input power supply and an LED illumination system and comprises a voltage monitoring unit, a dimming micro-control unit and a PWM signal-to-current dimming unit;
the voltage monitoring unit is used for monitoring the input voltage of the input power supply;
the dimming micro-control unit is used for outputting PWM signals for controlling the PWM signal-to-current dimming unit according to the change value of the input voltage;
the PWM signal-to-current dimming unit is used for adjusting input current loaded on the LED lighting system according to the PWM signal.
In a preferred embodiment of the present invention, the PWM signal-to-current dimming unit further includes a PWM dimming chip U1, a resistor five R5, a resistor six R6, and a MOS transistor Q4;
the grid electrode of the MOS tube Q4 is connected with a GATE control output end GATE of the PWM dimming chip U1, the drain electrode of the MOS tube Q is connected with the inductor L and then connected with the LED lighting system, and the source electrode of the MOS tube Q is connected with a resistor six R6 and then connected with a chip selection end CS of the PWM dimming chip U1;
the source electrode of the MOS tube Q4 is also connected with a resistor five R5 and then grounded, and the source electrode of the MOS tube Q4 is also connected with an LED control end LEDV of the dimming micro-control unit;
the reference end REF of the PWM dimming chip U1 is connected with the dimming micro-control unit.
In a preferred embodiment of the present invention, the PWM signal-to-current dimming unit further includes an integrating circuit, where the integrating circuit is connected between the reference terminal REF of the PWM dimming chip U1 and the dimming micro-control unit, and is configured to convert the PWM signal output by the dimming micro-control unit into a voltage signal and output the voltage signal to the reference terminal REF of the PWM dimming chip U1;
the integrating circuit comprises a resistor three R3, a resistor four R4, a capacitor one C1 and a capacitor two C2; the resistor III R3 and the resistor IV R4 are connected in series between a reference end REF and a power end VCC of the PWM dimming chip U1; one end of the capacitor C1 is grounded, and the other end of the capacitor C1 is connected with the node B between the resistor R4 and the REF; one end of the second capacitor C2 is grounded, and the other end of the second capacitor C is connected with a node A between the resistor three R3 and the resistor four R4.
In a preferred embodiment of the present invention, the PWM signal-to-current dimming unit further includes a triode tri-Q3; the base electrode of the triode three Q3 is connected with the base electrode resistor Rb3 and then connected with the PWM output end of the dimming micro-control unit, the collector electrode of the triode three Q3 is grounded, and the emitter electrode of the triode three Q3 is connected with the emitter electrode resistor Re3 and then connected with the power end VCC of the PWM dimming chip U1.
In a preferred embodiment of the present invention, the PWM signal-to-current dimming unit further includes a start circuit, and the start circuit is connected between the input power supply and the PWM dimming chip U1; the starting circuit comprises a triode II Q2 and a voltage stabilizing tube TVS; the collector of the triode II Q2 is connected with the collector resistor Rc2 and then is connected with the input power supply, the emitter of the triode II Q is connected with the power supply input end VIN of the PWM dimming chip U1, and the emitter of the triode II is also grounded; the base electrode of the power supply is connected with the cathode of the voltage stabilizing tube TVS, the cathode of the voltage stabilizing tube TVS is also connected with the input power supply, and the anode of the voltage stabilizing tube TVS is grounded.
In a preferred embodiment of the present invention, the dimming micro-control unit further includes a dimming start circuit, where the dimming start circuit is used to control the LED lighting system to be connected to the input power supply or to control the LED lighting system to be disconnected from the input power supply;
the dimming starting circuit comprises a relay K and a triode Q1, wherein the relay K is provided with a normally open contact K1, and the normally open contact K1 is connected in series between the LED lighting system and the input power supply; the collector of the triode Q1 is connected with the relay K and then connected with the direct-current power supply VDD, the emitter of the triode Q1 is grounded, and the base of the triode Q1 is connected with the base resistor Rb1 and then connected with the starting end ON of the dimming micro-control unit.
In a preferred embodiment of the present invention, the voltage monitoring unit further includes a resistor one R1 and a resistor two R2, the resistor one R1 and the resistor two R2 are connected in series between the input power source and the ground, and the voltage collecting terminal LV of the dimming micro-control unit is connected to a node C between the resistor one R1 and the resistor two R2.
In a preferred embodiment of the present invention, the first transistor Q1 is an NPN transistor, the second transistor Q2 is an NPN transistor, and the third transistor Q3 is a PNP transistor.
In a preferred embodiment of the present invention, the MOS transistor is an N-type MOS transistor.
In a preferred embodiment of the present invention, the PWM dimming chip U1 further includes a model MV1011.
The invention has the beneficial effects that: the loop dimming circuit is suitable for loop dimming of the LED modules of the intelligent lighting system, loop light balancing of the LED modules in the area of the intelligent lighting system, and the dimming process and the light balancing process are not influenced by fluctuation of an input power supply, so that constant current source dimming and light balancing are realized.
Drawings
Fig. 1 is a schematic circuit diagram of a loop dimming circuit in a preferred embodiment of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific examples, which are not intended to be limiting, so that those skilled in the art will better understand the invention and practice it.
As shown in fig. 1, the present embodiment discloses a loop dimming circuit, which is suitable for loop dimming of an LED module of an intelligent lighting system, and is also suitable for loop light balancing of an LED module in a region of the intelligent lighting system. The loop dimming circuit is connected between an input power supply and an LED lighting system and comprises a voltage monitoring unit, a dimming micro-control unit and a PWM signal-to-current dimming unit;
the voltage monitoring unit is used for monitoring the input voltage of the input power supply; specifically, the voltage monitoring unit includes a resistor one R1 and a resistor two R2, the resistor one R1 and the resistor two R2 are connected in series between the input power source and the ground, and the voltage collecting terminal LV of the dimming micro-control unit is connected to a node C between the resistor one R1 and the resistor two R2.
The light-adjusting micro-control unit is used for outputting PWM signals for controlling the PWM signal-to-current light-adjusting unit according to the change value of the input voltage;
the PWM signal-to-current dimming unit is used for adjusting the input current loaded on the LED lighting system according to the PWM signal.
Specifically, the 5S internal voltage monitoring unit after the system is powered on collects the input voltage V1 of the input power supply, the load at the rear end is not started yet in the 5S after the system is powered on, the input voltage V1 of the input power supply is the maximum value at this time, and the maximum voltage value is used as a reference value to perform loop dimming and loop light balancing on the LED lighting system.
And in 5S after the system is electrified, the dimming micro-control unit outputs a dimming reference PWM signal according to the input voltage Vi, and the PWM signal-to-current dimming unit converts the reference PWM signal into a reference voltage signal Vref and stores the reference voltage signal Vref.
And after the system is electrified for 5S, the input voltage Vi of the input power supply is periodically monitored, and the dimming micro-control unit outputs a PWM signal for controlling the PWM signal to current conversion dimming unit according to the difference change of the input voltage Vi and the input voltage V1. The dimming micro-control unit adjusts an input current loaded on the LED lighting system according to the PWM signal.
Specifically, the PWM signal-to-current dimming unit includes a PWM dimming chip U1, an integrating circuit, a resistor five R5, a resistor six R6, a MOS transistor Q4, and a triode three Q3. In the technical scheme of the embodiment, the PWM dimming chip U1 is preferably MV1011, the triode three Q3 is preferably PNP triode, and the MOS tube Q4 is preferably N MOS tube.
The grid electrode of the MOS tube Q4 is connected with a GATE control output end GATE of the PWM dimming chip U1, the drain electrode of the MOS tube Q is connected with an inductor L and then connected with an LED lighting system, and the source electrode of the MOS tube Q is connected with a resistor six R6 and then connected with a chip selection end CS of the PWM dimming chip U1; the source electrode of the MOS tube Q4 is also connected with a resistor five R5 and then grounded, and the source electrode of the MOS tube Q4 is also connected with an LED control end LEDV of the dimming micro-control unit; the reference end REF of the PWM dimming chip U1 is connected with the dimming micro-control unit.
The integrating circuit is connected between the reference end REF of the PWM dimming chip U1 and the dimming micro-control unit and is used for converting a PWM signal output by the dimming micro-control unit into a voltage signal and outputting the voltage signal to the reference end REF of the PWM dimming chip U1; the integrating circuit comprises a resistor three R3, a resistor four R4, a capacitor one C1 and a capacitor two C2; the resistor III R3 and the resistor IV R4 are connected in series between a reference end REF and a power end VCC of the PWM dimming chip U1; one end of the capacitor C1 is grounded, and the other end of the capacitor C1 is connected with the node B between the resistor R4 and the REF; one end of the second capacitor C2 is grounded, and the other end of the second capacitor C is connected with a node A between the resistor three R3 and the resistor four R4.
The base electrode of the triode three Q3 is connected with the base electrode resistor Rb3 and then connected with the PWM output end of the dimming micro-control unit, the collector electrode of the triode three Q3 is grounded, and the emitter electrode of the triode three Q3 is connected with the emitter electrode resistor Re3 and then connected with the power end VCC of the PWM dimming chip U1.
The PWM signal-to-current dimming unit converts a PWM signal output by the dimming micro-control unit into a voltage signal through an integrating circuit, the PWM dimming chip U1 determines a PWM signal of the output control transistor Q4 according to the difference value between the converted voltage signal and the reference voltage signal Vref, and the larger the duty ratio of the PWM signal of the control transistor Q4 is, the larger the input current loaded on the LED lighting system is, and the larger the brightness of the LED lighting system is; conversely, the less the brightness of the LED lighting system.
In the prior art, the dimming system comprises a dimming micro-control unit and a Buck converter controlled by the dimming micro-control unit, the Buck converter is controlled by the dimming micro-control unit to output PWM signals, so that an output circuit of the Buck converter changes, and then the current loaded on the LED lighting system is adjusted.
In the loop dimming circuit, a PWM signal output by a dimming micro-control unit is converted into a voltage signal through an integrating circuit and is output to a PWM dimming chip U1, wherein a reference voltage signal Vref in a power-on 5S is stored in the PWM dimming chip U1, the PWM dimming chip U1 with an MV1011 as a chip select end CS is related to the reference voltage signal Vref, the voltage signal converted by the integrating circuit is connected with a reference end REF of the MV1011, and the MV1011 determines a PWM signal for controlling the on-duty ratio of an N-type MOS tube Q4 according to the voltage signal received by the reference end REF and the current signal of the chip select end CS. With this design, no matter whether the input power supply voltage is toggled or not, the current value loaded on the LED lighting system through the N-type MOS tube Q4 is a constant current value after dimming.
As a further improvement of the present invention, the dimming micro-control unit includes a dimming start circuit, where the dimming start circuit is used to control the LED lighting system to be connected to the input power supply or to control the LED lighting system to be disconnected from the input power supply; specifically, the dimming starting circuit includes a relay K and a first triode Q1, where in the technical scheme of the embodiment, the first triode Q1 is preferably an NPN triode, the relay K has a normally open contact K1, and the normally open contact K1 is connected in series between the LED lighting system and the input power supply; the collector of the triode Q1 is connected with the relay K and then connected with the direct-current power supply VDD, the emitter of the triode Q1 is grounded, and the base of the triode Q1 is connected with the base resistor Rb1 and then connected with the starting end ON of the dimming micro-control unit.
When the starting end of the dimming micro-control unit is ON and outputs a high level, the triode Q1 is conducted, the normally open contact K1 of the relay is closed, and the LED lighting system is connected with the input power supply; ON the contrary, when the starting end is ON and outputs a low level, the triode Q1 is closed, the normally open contact K1 of the relay is disconnected, and the LED lighting system is disconnected from the input power supply. Thereby soft-starting or soft-closing the loop dimming circuit.
Further, the PWM signal-to-current dimming unit further includes a start circuit, where the start circuit is connected between the input power supply and the PWM dimming chip U1; the starting circuit comprises a triode II Q2 and a voltage stabilizing tube TVS, and in the technical scheme of the embodiment, the triode II Q2 preferably uses an NPN triode; the collector of the triode II Q2 is connected with the collector resistor Rc2 and then is connected with the input power supply, the emitter of the triode II Q2 is connected with the power supply input end VIN of the PWM dimming chip U1, and the emitter of the triode II Q is also grounded; the base electrode of the power supply is connected with the cathode of the voltage stabilizing tube TVS, the cathode of the voltage stabilizing tube TVS is also connected with the input power supply, and the anode of the voltage stabilizing tube TVS is grounded. After the circuit dimming circuit is started by the dimming starting circuit in a soft mode, the triode II Q2 is conducted, and the PWM dimming chip U1 enters a working mode; otherwise, the PWM dimming chip U1 enters a low-power mode, so that the working mode of the PWM dimming chip U1 is facilitated to be started.
On the other hand, after the dimming voltage stabilizer TVS enables the loop dimming circuit to be started, the emitter of the triode II Q2 stably outputs 100V voltage, and the stable starting of the PWM dimming chip U1 is ensured.
In the above, when the loop dimming circuit of the invention is applied to loop dimming of an LED module in an intelligent lighting system, the hardware structure is the same as the above, and the working principle is the same as the above, and the specific implementation difference is that the dimming micro-control unit and the PWM dimming chip U1 are different in specific programming.
The above-described embodiments are merely preferred embodiments for fully explaining the present invention, and the scope of the present invention is not limited thereto. Equivalent substitutions and modifications will occur to those skilled in the art based on the present invention, and are intended to be within the scope of the present invention. The protection scope of the invention is subject to the claims.
Claims (9)
1. The loop dimming circuit for intelligent illumination is connected between an input power supply and an LED illumination system and is characterized by comprising a voltage monitoring unit, a dimming micro-control unit and a PWM signal-to-current dimming unit;
the voltage monitoring unit is used for monitoring the input voltage of the input power supply;
the dimming micro-control unit is used for outputting PWM signals for controlling the PWM signal-to-current dimming unit according to the change value of the input voltage;
the PWM signal-to-current dimming unit is used for adjusting input current loaded on the LED lighting system according to the PWM signal;
the PWM signal-to-current dimming unit comprises a PWM dimming chip (U1), a resistor five (R5), a resistor six (R6) and a MOS tube (Q4);
the grid electrode of the MOS tube (Q4) is connected with the GATE control output end (GATE) of the PWM dimming chip (U1), the drain electrode of the MOS tube is connected with the inductor (L) and then connected with the LED lighting system, and the source electrode of the MOS tube is connected with the resistor (R6) and then connected with the chip selection end (CS) of the PWM dimming chip (U1);
the source electrode of the MOS tube (Q4) is also connected with a resistor five (R5) and then grounded, and the source electrode of the MOS tube is also connected with an LED control end (LEDV) of the dimming micro-control unit;
a Reference End (REF) of the PWM dimming chip (U1) is connected with the dimming micro-control unit;
the PWM signal-to-current dimming unit further comprises an integrating circuit, wherein the integrating circuit is connected between a Reference End (REF) of the PWM dimming chip (U1) and the dimming micro-control unit and is used for converting a PWM signal output by the dimming micro-control unit into a voltage signal and outputting the voltage signal to the Reference End (REF) of the PWM dimming chip (U1);
the integrating circuit comprises a resistor three (R3), a resistor four (R4), a capacitor one (C1) and a capacitor two (C2); the resistor III (R3) and the resistor IV (R4) are connected in series between a Reference End (REF) and a power supply end (VCC) of the PWM dimming chip (U1); one end of the capacitor I (C1) is grounded, and the other end of the capacitor I is connected with the node B between the resistors IV (R4) and (REF); one end of the second capacitor (C2) is grounded, and the other end of the second capacitor is connected with a node A between the third resistor (R3) and the fourth resistor (R4);
the PWM signal-to-current dimming unit further comprises a triode three (Q3); the base electrode of the triode III (Q3) is connected with the base electrode resistor one (Rb 3) and then is connected with the PWM output end of the dimming micro-control unit, the collector electrode of the triode III is grounded, and the emitter electrode of the triode III is connected with the emitter electrode resistor (Re 3) and then is connected with the power supply end (VCC) of the PWM dimming chip (U1).
2. The loop dimming circuit for intelligent lighting as set forth in claim 1, wherein: the PWM signal-to-current dimming unit further comprises a starting circuit, and the starting circuit is connected between the input power supply and a PWM dimming chip (U1); the starting circuit comprises a triode II (Q2) and a voltage stabilizing Tube (TVS); the collector of the triode II (Q2) is connected with the collector resistor (Rc 2) and then is connected with the input power supply, the emitter of the triode II is connected with the power supply input end (VIN) of the PWM dimming chip (U1), and the emitter of the triode II is grounded; the base electrode of the power supply is connected with the cathode of a voltage stabilizing Tube (TVS), the cathode of the voltage stabilizing Tube (TVS) is also connected with the input power supply, and the anode of the voltage stabilizing Tube (TVS) is grounded.
3. The loop dimming circuit for intelligent lighting as set forth in claim 1, wherein: the light-dimming micro-control unit comprises a light-dimming starting circuit, wherein the light-dimming starting circuit is used for controlling the LED lighting system to be connected with the input power supply or controlling the LED lighting system to be disconnected from the input power supply;
the dimming starting circuit comprises a relay (K) and a triode I (Q1), wherein the relay (K) is provided with a normally open contact (K1), and the normally open contact (K1) is connected in series between the LED lighting system and the input power supply; the collector of the triode I (Q1) is connected with the relay (K) and then is connected with the direct current power supply (VDD), the emitter of the triode I is grounded, and the base of the triode I is connected with the base resistor II (Rb 1) and then is connected with the starting end (ON) of the dimming micro-control unit.
4. The loop dimming circuit for intelligent lighting as set forth in claim 1, wherein: the voltage monitoring unit comprises a first resistor (R1) and a second resistor (R2), the first resistor (R1) and the second resistor (R2) are connected in series between an input power supply and the ground, and a voltage acquisition end (LV) of the dimming micro-control unit is connected with a node C between the first resistor (R1) and the second resistor (R2).
5. The loop dimming circuit for intelligent lighting as set forth in claim 1, wherein: and the triode III (Q3) is a PNP triode.
6. The loop dimming circuit for intelligent lighting as set forth in claim 2, wherein: and the triode II (Q2) is an NPN triode.
7. A loop dimming circuit for intelligent lighting as recited in claim 3, wherein: the triode I (Q1) is an NPN triode.
8. The loop dimming circuit for intelligent lighting as set forth in claim 1, wherein: the MOS tube is an N-type MOS tube.
9. The loop dimming circuit for intelligent lighting as set forth in claim 1, wherein: the model of the PWM dimming chip (U1) is MV1011.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811367563.9A CN109309993B (en) | 2018-11-16 | 2018-11-16 | Loop dimming circuit for intelligent illumination |
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| CN201811367563.9A CN109309993B (en) | 2018-11-16 | 2018-11-16 | Loop dimming circuit for intelligent illumination |
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