CN211019367U

CN211019367U - DA L I power of adjusting luminance

Info

Publication number: CN211019367U
Application number: CN201921525458.3U
Authority: CN
Inventors: 李锦红; 陈钦裕; 谭超
Original assignee: Guangdong Kegu Power Co ltd
Current assignee: Guangdong Kegu Power Co ltd
Priority date: 2019-09-09
Filing date: 2019-09-09
Publication date: 2020-07-14
Anticipated expiration: 2029-09-09

Abstract

The utility model discloses a DA L I power of adjusting luminance, the AC interface, bridge rectifier circuit, preceding stage constant voltage circuit, back level constant voltage circuit and the output interface that adjusts luminance connect gradually, DA L I signal interface, DA L I signal processing circuit and DA L I control circuit connect gradually, the input and the preceding stage constant voltage circuit of auxiliary power supply circuit are connected, its output and DA L I control circuit are connected, DA L I control circuit still is connected with back level constant voltage circuit, dial switch circuit respectively with preceding stage constant voltage circuit, adjust luminance the output interface connection, through the above-mentioned setting, DA L I power of adjusting luminance has DA L I and adjusts luminance and dial switch two kinds of modes of adjusting luminance, can be applicable in large-scale place or small-size place and use, can cooperate the dimming control equipment implementation such as dimming panel, dimming control system to large-scale place, adopt DA L I agreement control to adjust luminance, to the dimming control equipment that does not need expensive collocation to small-size place, adopt dial switch to realize the multiple gear and adjust luminance can, the applicable face and the price/performance ratio that have improved DA L I power.

Description

DA L I power of adjusting luminance

Technical Field

The utility model relates to an L ED power field, in particular to DA L I power of adjusting luminance.

Background

DA L I is the abbreviation of Digital Addressable light Interface (Digital Addressable L lighting Interface), DA L I is the international standard, popular light control protocol bus, adopts manchester coded Digital transmission, has the powerful functions of whole, grouping switch and dimming, scene mode, addressing dimming and inquiring lamp state, etc., has the characteristics of accurate dimming, Addressable, stable, centralized control, convenient installation, etc.

The existing DA L I dimming power supply can only use a DA L I dimming panel, a DA L I dimmer or an expensive DA L I system to perform dimming, is high in use cost, is only suitable for large stage lighting or shop lighting and the like, and is not high in cost performance for common families and small scene lighting.

It is seen that improvements and enhancements to the prior art are needed.

SUMMERY OF THE UTILITY MODEL

In view of the foregoing disadvantages of the prior art, an object of the present invention is to provide a DA L I light modulation power supply, which aims to realize that multiple modes can modulate light to L ED, and improve the application range and cost performance of DA L I light modulation power supply.

In order to achieve the purpose, the utility model adopts the following technical proposal:

a DA L I dimming power supply comprises an alternating current interface, a DA L I signal interface, a DA L I signal processing circuit, an EMI filter circuit, a bridge rectifier circuit, a front-stage constant voltage circuit, a rear-stage constant voltage circuit, a DA L I signal processing circuit, a DA 366I signal processing circuit, a DA L I signal processing circuit, a DA L I signal processing circuit, a DA L I signal processing circuit, a DA 366I signal processing circuit, a DA L I signal processing circuit, a DA L I signal processing circuit, a DA L I signal processing circuit, an EMI filter circuit, a bridge rectifier circuit, a front-stage constant voltage circuit, a rear-stage constant voltage circuit, a front-stage constant voltage circuit, a bridge rectifier circuit, a rear-stage constant voltage circuit, a DA L I signal processing circuit, a DA L I signal processing circuit, a DA 366I signal processing circuit, a DA 368I signal processing circuit, a DA L I signal processing circuit, a DA signal output constant voltage output circuit, a constant voltage control circuit output circuit, a constant voltage control circuit output circuit.

The DA L I dimming power supply further comprises a zero-crossing detection circuit used for carrying out zero-crossing detection on alternating current, and the zero-crossing detection circuit is respectively connected with the alternating current interface, the preceding stage constant voltage circuit and the DA L I control circuit.

The DA L I dimming power supply further comprises a power-down maintaining circuit used for maintaining the DA L I control circuit to work after power failure, and the power-down maintaining circuit is respectively connected with the auxiliary power supply circuit, the rear-stage constant voltage circuit and the dial switch circuit.

The DA L I dimming power supply further comprises an overcurrent detection circuit used for protecting the circuit, and the overcurrent detection circuit is respectively connected with the DA L I control circuit, the post-stage constant voltage circuit and the auxiliary power supply circuit.

DA L I power of adjusting luminance, wherein, preceding stage constant voltage circuit sets up to the constant voltage control chip, back stage constant voltage circuit sets up to the control chip of adjusting luminance.

DA L I power supply that adjusts luminance, wherein, the model of constant voltage control chip is RT7339P, the model of the light control chip of adjusting luminance is RT 8406.

The DA L I dimming power supply comprises a dial switch and a sixth diode, wherein a pin OFF2 of the dial switch is connected with a pin ON2 sequentially through a twenty-fifth resistor connected with the twenty-sixth resistor in parallel and a twenty-third resistor connected with the twenty-fourth resistor in parallel, a pin 0N1 is connected with the twenty-third resistor through a twenty-second resistor connected with the twenty-first resistor in parallel, a pin OFF2 is further connected with a pin OFF1, the twenty-fifth resistor is further connected with a dimming output interface and a rear-stage constant voltage circuit, a cathode of the sixth diode is respectively connected with a pin OFF2, the twenty-fifth resistor and a front-stage constant voltage circuit, and an anode of the sixth diode is connected with the rear-stage constant voltage circuit.

The DA L I dimming power supply comprises a ninth diode, a twelfth diode, a fifth triode and an optical coupler U3, wherein the anode of the ninth diode and the anode of the twelfth diode are respectively connected with an alternating current interface, the cathode of the ninth diode is connected with the cathode of the twelfth diode, the cathode of the ninth diode is sequentially connected with the base of the fifth triode through a forty-sixteenth resistor, a forty-seventh resistor and a forty-eighth resistor, the base of the fifth triode is connected with an emitter through a forty-ninth resistor connected with a twenty-third capacitor in parallel, the emitter is connected with a ground AGND, the anode input end of the optical coupler U3 is connected with a front-stage constant voltage circuit through a fifty-fifth resistor, the cathode input end of the optical coupler is connected with the collector of the fifth triode, the anode output end of the optical coupler is connected with an auxiliary power supply circuit, the cathode output end of the optical coupler is connected with a DA L I control circuit, and the cathode output end of the optical coupler is further connected with the ground DGND through a first resistor connected with a twenty-fourth capacitor in.

The DA L I dimming power supply comprises a standby power supply, a seventh triode, an eighth triode and a ninth triode, wherein the standby power supply is connected with the base electrode of the ninth triode through a first voltage-stabilizing tube and a fifty-eighth resistor in sequence, the standby power supply is further connected with the collector electrode of the ninth triode through a fifty-seventeenth resistor, the base electrode of the ninth triode is connected with the emitter electrode through a fifty-nineteenth resistor, the emitter electrode of the ninth triode is connected with a digital ground DGND, the base electrode of the eighth triode is connected with the collector electrode of the ninth triode, the emitter electrode of the eighth triode is connected with the emitter electrode of the ninth triode, the base electrode of the seventh triode is connected with the collector electrode of the eighth triode through a fifty-sixteenth resistor, the collector electrode of the seventh triode is connected with an auxiliary power supply circuit, the emitter electrode of the seventh triode is connected with the base electrode through a fifteenth resistor, and the emitter electrodes are.

The DA L I dimming power supply comprises an eighth diode, a third triode and a fourth triode, wherein the anode of the eighth diode is connected with a rear-stage constant voltage circuit, the cathode of the eighth diode is connected with the base electrode of the third triode through a thirty-ninth resistor and a forty-fourth resistor in sequence, one end of the thirty-ninth resistor connected with the forty-fourth resistor is connected with a digital ground DGND through a forty-first resistor connected with a twenty-second capacitor in parallel, the base electrode of the third triode is connected with the emitter electrode of the third triode through a forty-twelfth resistor, the emitter electrode of the third triode is connected with the digital ground DGND, the collector electrode of the third triode is connected with the base electrode of the fourth triode through a forty-fourteenth resistor and is connected with the emitter electrode of the fourth triode through a forty-thirteenth resistor, the collector electrode of the fourth triode is connected with a DA L I control circuit through a fifteenth resistor, and the emitter electrode of the fourth triode is further connected.

Has the advantages that:

the utility model provides a DA L I power of adjusting luminance, compare prior art, through setting up dial switch circuit and DA L I control circuit, DA L I power of adjusting luminance has DA L I and adjusts luminance and two kinds of modes with the dial switch, it is applicable in large-scale place (market, large-scale stage etc.) or small-size place (ordinary family, small-size stage etc.) use, can cooperate dimming control equipment such as panel, dimming control system to large-scale place to implement, adopt DA L I protocol control to adjust luminance, need not to match expensive dimming control equipment to small-size place, it can to adopt the dial switch to realize that many gears adjust luminance, DA L I power of adjusting luminance's application face and price/performance ratio have been improved greatly.

Drawings

Fig. 1 is a connection diagram of a DA L I dimming power supply of the present invention.

Fig. 2 is a schematic circuit diagram of the main part of the present invention.

Fig. 3 is a schematic circuit diagram of the DA L I control circuit according to the present invention.

Fig. 4 is a schematic circuit diagram of the DA L I signal processing circuit according to the present invention.

Fig. 5 is the circuit schematic diagram of the auxiliary power supply circuit and the power down maintaining circuit of the present invention.

Fig. 6 is a schematic circuit diagram of the zero-crossing detection circuit of the present invention.

Fig. 7 is an enlarged schematic view of a portion a in fig. 2.

Fig. 8 is an enlarged schematic view of a portion B in fig. 2.

The main element symbols show that the LED lamp comprises a 01-alternating current interface, a 02-DA L I signal interface, a 03-DA L I control circuit, a 04-DA L I signal processing circuit, a 05-EMI filter circuit, a 06-bridge rectifier circuit, a 07-front stage constant voltage circuit, a 08-auxiliary power supply circuit, a 09-rear stage constant voltage circuit, a 10-dial switch circuit, an 11-dimming output interface, a 12-zero-crossing detection circuit, a 13-power-down maintaining circuit, a 14-overcurrent detection circuit, a 15-overvoltage protection circuit and a 16-open circuit detection circuit.

Detailed Description

The utility model provides a DA L I power of adjusting luminance, for making the utility model discloses an aim at, technical scheme and effect are clearer, make clear and definite, and it is right to refer to the attached drawing below and to mention the embodiment the utility model discloses further detailed description should understand, the specific embodiment that describes here only is used for explaining the utility model discloses, is not used for injecing the protection scope of the utility model.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other suitable relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Referring to fig. 1, the utility model provides a DA L I dimming power supply, which comprises an alternating current interface 01 for inputting alternating current, a DA L I signal interface 02 for receiving and sending DA L I signal instructions, a DA L I control circuit 03 for executing DA L I signal instructions and feeding back DA L I signal instructions and output control signals, a DA L I signal processing circuit 04 for processing DA L I signal instructions sent by a DA L I signal interface and sending the DA 5966I signal instructions to a DA L I control circuit and feeding back DA L I signal instructions of the DA L I control circuit to a DA L I signal interface, an EMI filter circuit 05 for filtering out electromagnetic interference in alternating current input by the alternating current interface, a bridge rectifier circuit 06 for rectifying alternating current voltage processed by the EMI filter circuit into direct current voltage, a pre-stage circuit 07 for performing constant voltage regulation on direct current voltage supplied by the bridge rectifier circuit, an auxiliary power supply circuit 08 for performing constant voltage regulation on alternating current supplied by the ad L I signal processing circuit and supplying constant voltage to a DA 638I control circuit, a pre-stage circuit for outputting constant voltage after constant voltage control circuit, a constant voltage control circuit L for outputting constant voltage control signal output by the ad 369 constant voltage control circuit, a constant voltage control circuit for outputting a constant voltage output constant voltage control signal output constant voltage output circuit 3642 connected with the DA 638I control circuit, and a constant voltage control circuit for outputting a constant voltage control circuit after constant voltage control circuit.

Referring to fig. 1, when the DA L I dimming light source works, there are two dimming modes, the first dimming mode is that ac power is input from an ac interface, and is filtered by EMI filtering to remove electromagnetic interference in the ac, such as spikes and noise, so as to avoid affecting subsequent rectification, the ac power is rectified into dc power through a bridge, the current power precisely controls voltage through a front stage constant voltage circuit to provide stable voltage output for a rear stage constant voltage circuit and an auxiliary power supply circuit, the auxiliary power supply circuit is used for supplying power to a DA L I control circuit, a DA L I signal command is sent from a DA L I signal interface, the signal is rectified by a DA L I signal processing circuit and then sent to a DA L I control circuit, the DA L I control circuit modulates a PWM control signal according to the DA L I signal command, and simultaneously feeds back a DA L I signal command to a DA L I signal interface to ensure reliability of the DA L I control, and finally, the DA L I control circuit sends the PWM control signal to the rear stage constant voltage circuit, the rear stage constant voltage output PWM L, and the DA L I control circuit realizes ED 100% dimming of the ED 100-ED light.

According to the second dimming mode, when DA L I dimming is not adopted, dimming controllers such as a dimming panel and a dimming control system are not needed to be matched for use, the preceding stage constant voltage circuit provides stable voltage to the dial switch circuit, the dial switch circuit utilizes the characteristic of the dial switch, dimming voltage output by the dial switch circuit is controlled through multiple gears, and multi-gear stepping dimming can be achieved for L ED.

Referring to fig. 2 and 8, in particular, the dial switch circuit 10 includes a dial switch SW1 and a sixth diode D6; a pin OFF2 of the dial switch SW1 is sequentially connected with a twenty-fifth resistor R25 connected with a twenty-sixth resistor R26 in parallel and a twenty-third resistor R23 connected with a twenty-fourth resistor R24 in parallel and a pin ON2, a pin 0N1 is connected with the twenty-third resistor R23 through a twenty-second resistor R22 connected with the twenty-first resistor R21 in parallel, a pin OFF2 is also connected with a pin OFF1, and a twenty-fifth resistor R25 is also connected with the dimming output interface 11 and the rear-stage constant voltage circuit 09; the cathode of the sixth diode D6 is connected to the pin OFF2, the twenty-fifth resistor R25, and the front stage constant voltage circuit 07, respectively, and the anode thereof is connected to the rear stage constant voltage circuit 09. Through the setting, the dial switch SW1 can be switched on or off through different pins, and the current flows through the paths with different resistance values, so that 16 gears can output the dimming voltage step by step.

Referring to fig. 3, in some embodiments, the DA L I control circuit is a microprocessor chip U7, preferably of the type STM32F051K 8.

Referring to fig. 2, 7 and 8, in some embodiments, the former stage constant voltage circuit 07 is configured as a constant voltage control chip U1, and the latter stage constant voltage circuit 09 is configured as a dimming control chip U2. Preferably, the model of the constant voltage control chip U1 is RT7339P, and the model of the dimming control chip U2 is RT 8406.

Referring to fig. 7, in the present embodiment, in a connection manner of the constant voltage control chip U1 of the front stage constant voltage circuit 07, a multi-winding transformer is provided for supplying power to the rear stage constant voltage circuit and the auxiliary control circuit, and the multi-winding transformer includes a winding T1A, a winding T1B, a winding T1C, and a winding T1D; be provided with sampling resistor simultaneously, sampling resistor is sixteenth resistance R16, seventeenth resistance R17, eighteenth resistance R18, the nineteenth resistance R19 that connects in parallel, improves resistance power through the parallel mode, and the staff of being convenient for carries out the sampling test to the circuit.

Referring to fig. 3 and 8, in the present embodiment, the connection mode of the constant voltage control chip U2 of the post-stage constant voltage circuit 09 is connected to the PWM1/PWM2 terminal of the DA L I control circuit 03, and outputs the dimming voltage according to the PWM duty ratio, and meanwhile, the sampling resistors are a thirty-third resistor R33, a thirty-fourth resistor R34, and a thirty-fifth resistor R35 connected in parallel, so that the sampling test of the circuit by the staff is facilitated.

Referring to fig. 4, IN some embodiments, the DA L I signal processing circuit 04 rectifies and shapes the DA L I signal command through the second bridge diode BR2, and outputs the DA L0I signal command to the DA L2I _ IN _ OPTO terminal of the DA L1I control circuit 03, and the DA L I control circuit feeds back the DA L I signal command from the DA L I _ OUT _ OPTO terminal, and meanwhile, the DA L I signal processing circuit and the DA L I control circuit are connected through the optical coupler U5 and the optical coupler U6 to achieve optical-electrical isolation and protect the DA L I control circuit, wherein the optical coupler U5 is used for sending the DA L I signal command, and the optical coupler U6 is used for feeding back the DA L I signal command.

Referring to fig. 5, in some embodiments, the auxiliary power supply circuit 08 uses a voltage regulator U4 to regulate the voltage output by the pre-stage constant voltage circuit 07 to 3.3V, and the regulated voltage is preferably supplied to the DA L I control circuit 03, and the model of the voltage regulator is T L431.

Referring to fig. 7, in some embodiments, the EMI filter circuit 05 includes a first common mode inductor L1 and a second common mode inductor L2, and the first common mode inductor L1 and the second common mode inductor L2 are connected in parallel to the live line L and the neutral line N of the ac interface 01, so as to filter electromagnetic interference in the ac power.

Referring to fig. 7, in some embodiments, the bridge rectifier circuit 06 rectifies the ac power into dc power through a first rectifier diode BR 1.

Referring to fig. 6, in some embodiments, the apparatus further includes a zero-crossing detection circuit 12 for performing zero-crossing detection on the ac power, wherein the zero-crossing detection circuit is respectively connected to the ac interface 01, the pre-stage constant voltage circuit 07, and the DA L I control circuit 03, and provides a zero-crossing signal for the DA L I control circuit to control the output of the PWM control signal.

Referring to fig. 3 and 6, specifically, the zero-cross detection circuit 12 includes a ninth diode D9, a twelfth diode D10, a fifth triode Q5 and an optocoupler U3, an anode of the ninth diode D9 and an anode of the twelfth diode D10 are respectively connected to the ac interface 01, a cathode of the ninth diode D9 is connected to a cathode of the twelfth diode D10, a cathode of the ninth diode D9 is connected to a base of the fifth triode Q5 through a forty-sixth resistor R46, a forty-seventh resistor R47 and a forty-eighth resistor R48 in sequence, a base of the fifth triode Q5 is connected to an emitter of the forty-ninth resistor R49 connected in parallel to the twenty-third capacitor C23, an emitter of the ninth diode D3642 is connected to the ground, an anode of the optocoupler U3 is connected to the front stage circuit 07 through the fifty-ninth resistor R50, a cathode input of the fifth triode Q5 is connected to a collector of the twenty-third capacitor C23, an anode output of the fifty-first diode D6308 is connected to the auxiliary power supply circuit, a cathode of the optocoupler is connected to the twenty-first resistor R599 and a cathode of the twenty-control resistor R593 and an output terminal of the twenty-third capacitor C599.

Referring to fig. 5, in some embodiments, the power down maintaining circuit 13 is further included to maintain the operation of the DA L I control circuit 03 after power down, and the power down maintaining circuit is connected to the auxiliary power supply circuit 08, the post-stage constant voltage circuit 09, and the dial switch circuit 10, respectively, so as to ensure that the DA L I control circuit 03 can still receive signal commands within a period of time after power down.

Specifically, the power down maintaining circuit 13 includes a standby power supply, a seventh transistor Q7, an eighth transistor Q8, and a ninth transistor Q9; the backup power source in the present embodiment is preferably a 15V battery; the standby power supply is connected with the base electrode of a ninth triode Q9 through a first voltage regulator tube ZD1 and a fifty-eighth resistor R58 in sequence, and is also connected with the collector electrode of a ninth triode Q9 through a fifty-seventeenth resistor R57; the base of the ninth triode Q9 is connected with the emitter through a nineteenth resistor R59 and the emitter is connected with the ground DGND; the base electrode of the eighth triode Q8 is connected with the collector electrode of the ninth triode Q9, and the emitter electrode of the eighth triode Q8 is connected with the emitter electrode of the ninth triode Q9; the base of the seventh triode Q7 is connected with the collector of the eighth triode Q8 through a fifty-sixth resistor R56, the collector thereof is connected with the auxiliary power supply circuit 08, the emitter thereof is connected with the base through a fifty-fifth resistor R55, and the emitters are all connected with the front stage constant voltage circuit 07, the rear stage constant voltage circuit 09 and the dial switch circuit 10.

Referring to fig. 2, in some embodiments, the apparatus further includes an over-current detection circuit 12 for protecting the circuit, the over-current detection circuit is respectively connected to the DA L I control circuit 03, the post-stage constant voltage circuit 09, and the auxiliary power supply circuit 08, and the arrangement is such that the DA L I control circuit detects the output current of the post-stage constant voltage circuit, and when the current is too large, the duty ratio of the PWM signal is adjusted, so as to prevent the post-stage constant voltage circuit from being burned due to short circuit.

Specifically, the overcurrent detection circuit comprises an eighth diode D8, a third triode Q3 and a fourth triode Q4, wherein the anode of the eighth diode D8 is connected with the rear-stage constant voltage circuit 09, the cathode of the eighth diode D8 is connected with the base of the third triode Q3 sequentially through a thirty-ninth resistor R39 and a forty-fourth resistor R40, one end of the thirty-ninth resistor R39, which is connected with the forty-ninth resistor R40, is connected with a digital ground DGND through a forty-first resistor R41, which is connected with a twenty-second capacitor R22 in parallel, the base of the third triode Q3 is connected with the emitter of the third triode Q353526 through a fourth-twelfth resistor R42, the emitter of the third triode Q39 is connected with the digital ground DGND, the collector of the third triode Q4 is connected with the base of the fourth triode Q4 through a fourteenth resistor R44, the collector of the fourth triode Q43 is connected with the emitter of the fourth triode Q4, and the collector of the fourth triode Q4 is connected with a DA L I control circuit 03 through a fifteenth resistor R45, and the.

Referring to fig. 7, as a preferred embodiment, the present embodiment further includes an overvoltage protection circuit 15, where the overvoltage protection circuit includes a fuse F1, a first voltage-dependent resistor VR1 and a second voltage-dependent resistor VR2, the fuse F1 is disposed on the live line L of the ac interface 01, two ends of the first voltage-dependent resistor VR1 are respectively connected to the live line L and the neutral line N through a first common mode inductor L and a second common mode inductor L, one end of the second voltage-dependent resistor VR2 is connected to the ground AGND, and the other end thereof is respectively connected to the pre-stage constant voltage circuit 07 and the bridge rectifier circuit 06.

Referring to fig. 3 and 8, as a preferred embodiment, the present embodiment further includes an open circuit detection circuit 16, where the open circuit detection circuit 16 includes a line VO _ S, one end of the line VO _ S is connected to the OUT-end of the dimming voltage output interface 11, and the other end of the line VO _ S is connected to the VO _ S end of the DA L I control circuit 03, and the open circuit detection is performed on the dimming voltage output interface through the DA L I control circuit.

It is understood that equivalent substitutions or changes can be made by those skilled in the art according to the technical solution of the present invention and the inventive concept thereof, and all such changes or substitutions shall fall within the scope of the present invention.

Claims

1. A DA L I dimming power supply, comprising:

the alternating current interface is used for inputting alternating current;

the DA L I signal interface is used for receiving and sending DA L I signal instructions;

the DA L I control circuit is used for executing the DA L I signal command and feeding back the DA L I signal command and an output control signal;

the DA L I signal processing circuit is used for processing DA L I signal instructions sent by the DA L I signal interface, sending the DA L I signal instructions to the DA L I control circuit and feeding DA L I signal instructions of the DA L I control circuit back to the DA L I signal interface;

the EMI filter circuit is used for filtering out electromagnetic interference in alternating current input by the alternating current interface;

the bridge rectifier circuit is used for rectifying the alternating current voltage processed by the EMI filter circuit into direct current voltage;

the front stage constant voltage circuit is used for performing constant voltage regulation on the direct current voltage supplied by the bridge rectifier circuit;

an auxiliary power supply circuit for stabilizing the voltage supplied by the preceding stage constant voltage circuit and supplying the voltage to the DA L I control circuit;

the rear-stage constant voltage circuit is used for receiving the control signal output by the DA L I control circuit and outputting dimming voltage;

the dial switch circuit is used for controlling dimming voltage;

a dimming output interface for outputting a dimming voltage;

the LED dimming circuit comprises an alternating current interface, a bridge rectifier circuit, a front-stage constant voltage circuit, a rear-stage constant voltage circuit and a dimming output interface, wherein the alternating current interface, the bridge rectifier circuit, the front-stage constant voltage circuit, the rear-stage constant voltage circuit and the dimming output interface are sequentially connected, the DA L I signal interface, the DA L I signal processing circuit and the DA L I control circuit are sequentially connected, the input end of an auxiliary power supply circuit is connected with the front-stage constant voltage circuit, the output end of the auxiliary power supply circuit is connected with the DA L I control circuit, the DA L I control circuit is further connected with the rear-.

2. The DA L I dimming power supply of claim 1, further comprising a zero crossing detection circuit for performing zero crossing detection on the alternating current, wherein the zero crossing detection circuit is respectively connected with the alternating current interface, the preceding stage constant voltage circuit and the DA L I control circuit.

3. The DA L I dimming power supply of claim 1, further comprising a power-down maintaining circuit for maintaining the operation of the DA L I control circuit after power-off, wherein the power-down maintaining circuit is respectively connected with the auxiliary power supply circuit, the post-stage constant voltage circuit and the dial switch circuit.

4. The DA L I dimming power supply of claim 1, further comprising an over-current detection circuit for protecting the circuit, wherein the over-current detection circuit is connected to the DA L I control circuit, the post-stage constant voltage circuit and the auxiliary power supply circuit respectively.

5. The DA L I dimming power supply of claim 1, wherein the former stage constant voltage circuit is configured as a constant voltage control chip, and the latter stage constant voltage circuit is configured as a dimming control chip.

6. The DA L I dimming power supply of claim 5, wherein the model number of the constant voltage control chip is RT7339P, and the model number of the dimming control chip is RT 8406.

7. The DA L I dimming power supply of claim 1, wherein the dial switch circuit comprises a dial switch and a sixth diode, a pin OFF2 of the dial switch is connected with a pin ON2 sequentially through a twenty-fifth resistor connected in parallel with a twenty-sixth resistor and a twenty-third resistor connected in parallel with a twenty-fourth resistor, a pin 0N1 is connected with the twenty-third resistor through a twenty-second resistor connected in parallel with a twenty-first resistor, a pin OFF2 is further connected with a pin OFF1, the twenty-fifth resistor is further connected with the dimming output interface and the rear-stage constant voltage circuit, cathodes of the sixth diode are respectively connected with a pin OFF2, a twenty-fifth resistor and the front-stage constant voltage circuit, and anodes of the sixth diode are connected with the rear-stage constant voltage circuit.

8. The DA L I dimming power supply of claim 2, wherein the zero-crossing detection circuit comprises a ninth diode, a twelfth diode, a fifth triode and an optical coupler U3, wherein the anode of the ninth diode and the anode of the twelfth diode are respectively connected with the AC interface, the cathode of the ninth diode is connected with the cathode of the twelfth diode, the cathode of the ninth diode is connected with the base of the fifth triode through a forty-sixteenth resistor, a forty-seventh resistor and a forty-eighth resistor in sequence, the base of the fifth triode is connected with the emitter through a forty-ninth resistor connected in parallel with a twenty-third capacitor, and the emitter is connected with analog ground AGND, the anode input end of the optical coupler U3 is connected with a preceding stage constant voltage circuit through a fifty-fifth resistor, the cathode input end of the optical coupler U3 is connected with the collector of the fifth triode, the anode output end of the optical coupler U is connected with the auxiliary power supply circuit, the cathode output end of the optical coupler U3 is connected with the DA L I control circuit, and the cathode output end of the optical coupler U3 is further connected with digital ground.

9. The DA L I dimming power supply of claim 3, wherein the power down maintaining circuit comprises a standby power supply, a seventh triode, an eighth triode and a ninth triode, the standby power supply is connected with the base of the ninth triode through a first voltage regulator tube and a fifty-eighth resistor in sequence, and is further connected with the collector of the ninth triode through a fifty-seventeenth resistor, the base of the ninth triode is connected with the emitter through a fifty-ninth resistor and the emitter is connected with a digital DGND, the base of the eighth triode is connected with the collector of the ninth triode, the emitter of the eighth triode is connected with the emitter of the ninth triode, the base of the seventh triode is connected with the collector of the eighth triode through a fifty-sixteenth resistor, the collector of the seventh triode is connected with the auxiliary power supply circuit, the emitter of the seventh triode is connected with the base through a fifteenth resistor, and the emitters of the seventh triode are all connected with a front stage constant voltage circuit, a rear stage constant voltage circuit and a dial switch.

10. The DA L I dimming power supply of claim 4, wherein the over-current detection circuit comprises an eighth diode, a third triode and a fourth triode, the anode of the eighth diode is connected with the rear constant voltage circuit, the cathode of the eighth diode is connected with the base of the third triode through a thirty-ninth resistor and a forty-fourth resistor in sequence, one end of the thirty-ninth resistor connected with the forty-fourth resistor is connected with a digital ground DGND through a forty-first resistor connected with a twenty-second capacitor in parallel, the base of the third triode is connected with the emitter of the third triode through a forty-twelfth resistor, the emitter of the third triode is connected with the digital ground DGND, the collector of the third triode is connected with the base of the fourth triode through a forty-fourth resistor and with the emitter of the fourth triode through a forty-fourth-third resistor, the collector of the fourth triode is connected with a DA L I control circuit through a fifteenth resistor, and the emitter of the fourth triode is further connected with an auxiliary power supply circuit.