CN211702482U - Circuit capable of automatically identifying current of light source - Google Patents
Circuit capable of automatically identifying current of light source Download PDFInfo
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- CN211702482U CN211702482U CN202020049838.0U CN202020049838U CN211702482U CN 211702482 U CN211702482 U CN 211702482U CN 202020049838 U CN202020049838 U CN 202020049838U CN 211702482 U CN211702482 U CN 211702482U
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Abstract
The utility model discloses an automatic discernment light source current circuit, its characterized in that includes: the singlechip sends a first pulse width modulation signal and a second pulse width modulation signal to control the light source; the output end of the second operational amplifier is connected to the mos tube to control the mos tube to be switched off and switched on, the mos tube is respectively coupled to the load light source and the current signal feedback circuit, and the output end of the current signal feedback circuit is connected to the single chip microcomputer. The utility model discloses a supply circuit with adjustable stabilivolt of three-terminal gives the LED light source power supply to form a circuit that detects and adjust the electric current through setting up constant current control circuit, feed back the singlechip and adjust the power supply through the singlechip, make whole circuit can realize different invariable power supplies to the LED light source of difference, need not feedback resistance for prior art, discern any current value, accomplish stepless other discernment.
Description
Technical Field
The utility model relates to a light source circuit technical field, in particular to automatic discernment light source current circuit.
Background
The best mode for driving the LED is constant current at present, but the best mode is difficult to achieve aiming at a machine vision light source, and the LED driving method cannot be achieved due to thousands of different currents. At present, some manufacturers have proposed that different current outputs are realized by using feedback resistors, but the classification grade is limited due to the precision problem of the feedback resistors. The use of feedback resistors in the prior art is limited in rating due to accuracy problems. Stepless identification cannot be achieved.
SUMMERY OF THE UTILITY MODEL
There are limitations in view of the above-mentioned existing classification levels. The technical problem of stepless identification cannot be achieved. The utility model provides an automatic discernment light source current circuit.
An automatic identification light source current circuit, comprising:
the singlechip sends a first pulse width modulation signal and a second pulse width modulation signal to control the light source;
the power supply circuit comprises a first digital-to-analog conversion circuit, an amplifying circuit and a three-terminal adjustable voltage-regulator tube, wherein the input end and the output end of the first digital-to-analog conversion circuit are respectively connected with the first pulse width modulation signal and coupled to the input end of the amplifying circuit, the output end of the amplifying circuit is coupled to the input end of the three-terminal adjustable voltage-regulator tube, and the output end of the three-terminal adjustable voltage-regulator tube is coupled to a load light source;
the constant current control circuit comprises a second digital-to-analog conversion circuit, a second operational amplifier, a mos tube and a current signal feedback circuit, wherein the input end and the output end of the input end of the second digital-to-analog conversion circuit are respectively connected to the second pulse width modulation signal and coupled to the input end of the second operational amplifier, the output end of the second operational amplifier is connected to the mos tube to control the mos tube to be disconnected and connected, the mos tube is respectively coupled to the load light source and the current signal feedback circuit, and the output end of the current signal feedback circuit is connected to the single chip microcomputer.
Further, the first digital-to-analog conversion circuit includes:
the first end of the first resistor is connected to the first pulse width modulation signal, the second end of the first resistor is coupled to the first end of the second resistor, and the second end of the second resistor is an output end;
a first capacitor and a second capacitor, a first terminal of the first capacitor being coupled to a second terminal of the first resistor, a second terminal of the first capacitor being coupled to a first terminal of the second capacitor, a second terminal of the second capacitor being coupled to a second terminal of the second resistor;
the amplification circuit includes:
a second end of the second resistor is coupled to a positive input end of the first operational amplifier, and an output end of the first operational amplifier is coupled to an ADJ end of the three-end adjustable voltage regulator tube;
a third resistor, a first end of the third resistor being grounded, a second end of the third resistor being coupled to a negative input terminal of the first operational amplifier;
a fourth resistor having a first terminal coupled to the second terminal of the third resistor and a second terminal coupled to the output terminal of the first operational amplifier;
the output end of the three-end adjustable voltage-stabilizing tube is coupled with the anode of a first diode, and the cathode of the first diode pair is coupled to the input end of the three-end adjustable voltage-stabilizing tube;
the output end of the three-end adjustable voltage regulator tube is coupled with the first end of a third capacitor, and the second end of the third capacitor is grounded.
Further, the second digital-to-analog conversion circuit includes:
a fifth resistor and a sixth resistor, wherein a first end of the fifth resistor is connected to the second pulse width modulation signal, a second end of the fifth resistor is connected to a first end of the sixth resistor, and a second end of the sixth resistor is connected to a positive input end of the second operational amplifier;
the first end of the fourth capacitor is coupled to the second end of the fifth resistor, the second end of the fourth capacitor is coupled to the first end of the fifth capacitor, and the second end of the fifth capacitor is coupled to the second end of the sixth resistor.
Further, the current signal feedback circuit includes:
a first-stage amplifying circuit and a second-stage amplifying circuit;
the first-stage amplifying circuit comprises a third operational amplifier, a seventh resistor and an eighth resistor, wherein the negative input end of the third operational amplifier is coupled to the first end of the seventh resistor, the second end of the seventh resistor is grounded, the first end of the eighth resistor is coupled to the first end of the seventh resistor, and the second end of the eighth resistor is coupled to the output end of the third operational amplifier;
the second-stage amplification circuit comprises a fourth operational amplifier, a ninth resistor and a tenth resistor, wherein the negative input end of the fourth operational amplifier is coupled to the first end of the ninth resistor, the second end of the ninth resistor is grounded, the first end of the tenth resistor is coupled to the first end of the ninth resistor, the second end of the tenth resistor is coupled to the output end of the fourth operational amplifier, and the output end of the fourth operational amplifier is connected to the single chip microcomputer;
an output end of the third operational amplifier is coupled to a first end of an eleventh resistor, and a second end of the eleventh resistor is coupled to a positive input end of the fourth operational amplifier;
the positive input end of the third operational amplifier is coupled to the second end of a twelfth resistor, the first end of the twelfth resistor is coupled to the mos tube, the first end of the twelfth resistor is coupled to the first end of a thirteenth resistor, and the second end of the thirteenth resistor is coupled to the second end of a ninth resistor.
Further, a negative input end of the second operational amplifier is coupled to a second end of a fourteenth resistor, the second end of the fourteenth resistor is coupled to a first end of the fifteenth resistor, the second end of the fifteenth resistor is grounded, and the first end of the fourteenth resistor is connected to an external bias voltage;
the first end of the sixteenth resistor is coupled to the first end of the twelfth resistor, and the second end of the sixteenth resistor is coupled to the negative input end of the second operational amplifier.
Further, the constant current control circuit further comprises a protection circuit, the protection circuit comprises a fifth operational amplifier, a seventeenth resistor, an eighteenth resistor and a sixth capacitor, the positive input end of the fifth operational amplifier is coupled to the second end of the seventeenth resistor, the second end of the seventeenth resistor is coupled to the first end of the eighteenth resistor, the second end of the eighteenth resistor is grounded, and the first end of the seventeenth resistor is coupled to the coupling end of the load light source and the mos tube; a first end of the sixth capacitor is coupled to the positive input end of the fifth operational amplifier, and a second end of the sixth capacitor is coupled to a second end of the eighteenth resistor; and the output end of the fifth operational amplifier is connected to the singlechip.
Further, a voltage division circuit is coupled to the negative input end of the fifth operational amplifier.
Further, the voltage division circuit comprises a nineteenth resistor, a twentieth resistor and a seventh capacitor; a first end of the nineteenth resistor is coupled to the negative input terminal of the fifth operational amplifier, a second end of the nineteenth resistor is coupled to the first end of the twentieth resistor, a second end of the twentieth resistor is grounded, a first end of the seventh capacitor is coupled to the first end of the twentieth resistor, and a second end of the seventh resistor is coupled to the second end of the twentieth resistor.
Has the advantages that: the utility model discloses novel, reasonable in design, and convenient to use, the utility model discloses a supply circuit who has the adjustable stabilivolt of three-terminal gives the LED light source power supply to through setting up the circuit that constant current control circuit formed a detection and adjusting current, feed back the singlechip and adjust the power supply through the singlechip, make whole circuit can realize different invariable power supplies to the LED light source of difference, need not feed back resistance for prior art, discern any current value, accomplish stepless other discernment.
Drawings
Fig. 1 is a circuit diagram of a single chip in an embodiment of the present invention.
Fig. 2 is a circuit diagram of a power supply circuit according to an embodiment of the present invention.
Fig. 3 is a circuit diagram of a constant current control circuit according to an embodiment of the present invention.
Fig. 4 is a circuit diagram of a socket for a load light source according to an embodiment of the present invention.
Fig. 5 is a circuit diagram of a voltage divider circuit according to an embodiment of the present invention.
Detailed Description
The invention will be further explained with reference to the following figures and examples:
as shown in fig. 1 to 5, an automatic identification light source current circuit is characterized by comprising:
the single-chip microcomputer MCU sends a first pulse width modulation signal PWM1 and a second pulse width modulation signal PWM2 to control the light source;
the power supply circuit comprises a first digital-to-analog conversion circuit, an amplifying circuit and a three-terminal adjustable voltage regulator tube U1, wherein the input end and the output end of the first digital-to-analog conversion circuit are respectively connected to the first pulse width modulation signal PWM1 and coupled to the input end of the amplifying circuit, the output end of the amplifying circuit is coupled to the input end of the three-terminal adjustable voltage regulator tube U1, and the output end of the three-terminal adjustable voltage regulator tube U1 is coupled to a load light source;
the constant current control circuit comprises a second digital-to-analog conversion circuit, a second operational amplifier U4A, a mos tube Q1 and a current signal feedback circuit, wherein the input end and the output end of the input end of the second digital-to-analog conversion circuit are respectively connected to the second pulse width modulation signal PWM2 and coupled to the input end of the second operational amplifier U4A, the output end of the second operational amplifier U4A is connected to the mos tube Q1 to control the disconnection and connection of the mos tube Q1, the mos tube Q1 is respectively coupled to the load light source and the current signal feedback circuit, and the output end of the current signal feedback circuit is connected to the single-chip microcomputer MCU.
Specifically, the first digital-to-analog conversion circuit includes:
a first resistor R3 and a second resistor R4, a first end of the first resistor R3 is connected to the first PWM1, a second end of the first resistor R3 is coupled to a first end of the second resistor R4, and a second end of the second resistor R4 is an output end;
a first capacitor C3 and a second capacitor C2, a first terminal of the first capacitor C3 being coupled to a second terminal of the first resistor R3, a second terminal of the first capacitor C3 being coupled to a first terminal of the second capacitor C2, a second terminal of the second capacitor C2 being coupled to a second terminal of the second resistor R4;
the amplification circuit includes:
a first operational amplifier U2A, a second terminal of the second resistor R4 is coupled to a positive input terminal of the first operational amplifier U2A, and an output terminal of the first operational amplifier U2A is coupled to an ADJ terminal of the three-terminal adjustable voltage regulator U1;
a third resistor R1, a first terminal of the third resistor R1 being coupled to ground, a second terminal of the third resistor R1 being coupled to the negative input terminal of the first operational amplifier U2A;
a fourth resistor R4, a first terminal of the fourth resistor R4 coupled to a second terminal of the third resistor R1, a second terminal of the fourth resistor R4 coupled to an output terminal of the first operational amplifier U2A;
the output end of the three-terminal adjustable voltage regulator tube U1 is coupled with the anode of a first diode D1, and the cathode of the first diode D1 pair is coupled to the input end of the three-terminal adjustable voltage regulator tube U1;
the output end of the three-terminal adjustable voltage regulator tube U1 is coupled with the first end of a third capacitor C1, and the second end of the third capacitor C1 is grounded.
Specifically, the second digital-to-analog conversion circuit includes:
a fifth resistor R10 and a sixth resistor R11, wherein a first end of the fifth resistor R10 is connected to the second PWM2, a second end of the fifth resistor R10 is connected to a first end of the sixth resistor R11, and a second end of the sixth resistor R11 is connected to a positive input end of the second operational amplifier U4A;
a fourth capacitor C7 and a fifth capacitor C6, a first terminal of the fourth capacitor C7 being coupled to a second terminal of the fifth resistor R10, a second terminal of the fourth capacitor C7 being coupled to a first terminal of the fifth capacitor C6, and a second terminal of the fifth capacitor C6 being coupled to a second terminal of the sixth resistor R11.
Specifically, the current signal feedback circuit includes:
a first-stage amplifying circuit and a second-stage amplifying circuit;
the primary amplifying circuit comprises a third operational amplifier U5A, a seventh resistor R23 and an eighth resistor R24, wherein the negative input end of the third operational amplifier U5A is coupled to the first end of the seventh resistor R23, the second end of the seventh resistor R23 is grounded, the first end of the eighth resistor R24 is coupled to the first end of the seventh resistor R23, and the second end of the eighth resistor R24 is coupled to the output end of the third operational amplifier U5A;
the secondary amplifying circuit comprises a fourth operational amplifier U5B, a ninth resistor R26 and a tenth resistor R25, wherein the negative input end of the fourth operational amplifier is coupled to the first end of the ninth resistor R26, the second end of the ninth resistor R26 is grounded, the first end of the tenth resistor R25 is coupled to the first end of the ninth resistor R26, the second end of the tenth resistor R25 is coupled to the output end of the fourth operational amplifier U5B, and the output end of the fourth operational amplifier U5B is connected to the single-chip microcomputer MCU;
an output terminal of the third operational amplifier U5A is coupled to a first terminal of an eleventh resistor R21, a second terminal of the eleventh resistor R21 is coupled to a positive input terminal of the fourth operational amplifier U5B;
the positive input terminal of the third operational amplifier U5A is coupled to the second terminal of a twelfth resistor R20, the first terminal of the twelfth resistor R20 is coupled to the mos transistor Q1, the first terminal of the twelfth resistor R20 is coupled to the first terminal of a thirteenth resistor R22, and the second terminal of the thirteenth resistor R22 is coupled to the second terminal of a ninth resistor R26.
Specifically, a negative input end of the second operational amplifier U4A is coupled to a second end of a fourteenth resistor R5, a second end of the fourteenth resistor R5 is coupled to a first end of a fifteenth resistor R6, a second end of the fifteenth resistor R6 is grounded, and a first end of the fourteenth resistor R5 is connected to an external bias voltage;
also included is a sixteenth resistor R14, a first end of the sixteenth resistor R14 coupled to a first end of the twelfth resistor R20, a second end of the sixteenth resistor R14 coupled to the negative input of the second operational amplifier U4A.
Specifically, the constant current control circuit further comprises a protection circuit, the protection circuit comprises a fifth operational amplifier U4B, a seventeenth resistor R13, an eighteenth resistor R9 and a sixth capacitor C9, an anode input end of the fifth operational amplifier U4B is coupled to a second end of the seventeenth resistor R13, a second end of the seventeenth resistor R13 is coupled to a first end of the eighteenth resistor R9, a second end of the eighteenth resistor R9 is grounded, and a first end of the seventeenth resistor R13 is coupled to a coupling end of the load light source and mos tube Q1; a first terminal of the sixth capacitor C9 is coupled to the positive input terminal of the fifth operational amplifier U4B, and a second terminal of the sixth capacitor C9 is coupled to the second terminal of the eighteenth resistor R9; the output end of the fifth operational amplifier U4B is connected to the MCU.
Specifically, a voltage divider circuit is coupled to a negative input terminal of the fifth operational amplifier U4B.
Specifically, the voltage dividing circuit comprises a nineteenth resistor R17, a twentieth resistor R19 and a seventh capacitor C11; a first terminal of the nineteenth resistor R17 is coupled to the negative input terminal of the fifth operational amplifier U4B, a second terminal of the nineteenth resistor R17 is coupled to the first terminal of the twentieth resistor R19, a second terminal of the twentieth resistor R19 is coupled to ground, a first terminal of the seventh capacitor C11 is coupled to the first terminal of the twentieth resistor R19, and a second terminal of the seventh resistor R23 is coupled to the second terminal of the twentieth resistor R19.
Synthesize all above, the utility model discloses when in actual use, through singlechip MCU control load light source, singlechip MCU sends first pulse width modulation signal PWM1, and first pulse width modulation signal PWM1 forms analog signal through a digital analog conversion circuit conversion, reentrants amplifier circuit loading voltage and exports load light source position again after exporting three-terminal adjustable stabilivolt U1 after amplifying. Meanwhile, the singlechip MCU sends out a second pulse width modulation signal PWM2, the second pulse width modulation signal PWM2 is converted into an analog signal through a second digital-to-analog conversion circuit, and the analog signal enters a second operational amplifier U4A and is output to the mos tube Q1 to control the on-off of the mos tube Q1. The current on the load power supply passes through the mos tube Q1 and is fed back to the single chip microcomputer MCU through the current signal feedback circuit, and the single chip microcomputer MCU changes the output second pulse width modulation signal PWM2 according to the fed-back current so as to achieve the purpose of outputting by the constant current circuit. The thirteenth resistor R22 and the sixteenth resistor R14 are connected in series and are used as a current collecting circuit, and the current collecting circuit is directly connected to the negative electrode input end of the second operational amplifier U4A. The fourteenth resistor R5 and the fifteenth resistor R6 form a bias circuit. The current signal feedback circuit amplifies the voltage signal through the first-stage amplification circuit and the second-stage amplification circuit and then inputs the amplified voltage signal to the MCU.
As shown in fig. 4, a plug P1 is provided at the load light source, and CH1out of the plug P1 is connected to the mos tube Q1. The protection circuit plays a role in protection when a short circuit occurs at the load light source. In order to adjust the integral resistance value, a slide rheostat is also connected into the second digital-to-analog conversion circuit.
The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the teachings of the present invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.
Claims (8)
1. An automatic identification light source current circuit, comprising:
the singlechip sends a first pulse width modulation signal and a second pulse width modulation signal to control the light source;
the power supply circuit comprises a first digital-to-analog conversion circuit, an amplifying circuit and a three-terminal adjustable voltage-regulator tube, wherein the input end and the output end of the first digital-to-analog conversion circuit are respectively connected with the first pulse width modulation signal and coupled to the input end of the amplifying circuit, the output end of the amplifying circuit is coupled to the input end of the three-terminal adjustable voltage-regulator tube, and the output end of the three-terminal adjustable voltage-regulator tube is coupled to a load light source;
the constant current control circuit comprises a second digital-to-analog conversion circuit, a second operational amplifier, a mos tube and a current signal feedback circuit, wherein the input end and the output end of the input end of the second digital-to-analog conversion circuit are respectively connected to the second pulse width modulation signal and coupled to the input end of the second operational amplifier, the output end of the second operational amplifier is connected to the mos tube to control the mos tube to be disconnected and connected, the mos tube is respectively coupled to the load light source and the current signal feedback circuit, and the output end of the current signal feedback circuit is connected to the single chip microcomputer.
2. The auto-discrimination light source current circuit according to claim 1, wherein the first digital-to-analog conversion circuit comprises:
the first end of the first resistor is connected to the first pulse width modulation signal, the second end of the first resistor is coupled to the first end of the second resistor, and the second end of the second resistor is an output end;
a first capacitor and a second capacitor, a first terminal of the first capacitor being coupled to a second terminal of the first resistor, a second terminal of the first capacitor being coupled to a first terminal of the second capacitor, a second terminal of the second capacitor being coupled to a second terminal of the second resistor;
the amplification circuit includes:
a second end of the second resistor is coupled to a positive input end of the first operational amplifier, and an output end of the first operational amplifier is coupled to an ADJ end of the three-end adjustable voltage regulator tube;
a third resistor, a first end of the third resistor being grounded, a second end of the third resistor being coupled to a negative input terminal of the first operational amplifier;
a fourth resistor having a first terminal coupled to the second terminal of the third resistor and a second terminal coupled to the output terminal of the first operational amplifier;
the output end of the three-end adjustable voltage-stabilizing tube is coupled with the anode of a first diode, and the cathode of the first diode pair is coupled to the input end of the three-end adjustable voltage-stabilizing tube;
the output end of the three-end adjustable voltage regulator tube is coupled with the first end of a third capacitor, and the second end of the third capacitor is grounded.
3. The auto-discrimination light source current circuit of claim 2, wherein the second digital-to-analog conversion circuit comprises:
a fifth resistor and a sixth resistor, wherein a first end of the fifth resistor is connected to the second pulse width modulation signal, a second end of the fifth resistor is connected to a first end of the sixth resistor, and a second end of the sixth resistor is connected to a positive input end of the second operational amplifier;
the first end of the fourth capacitor is coupled to the second end of the fifth resistor, the second end of the fourth capacitor is coupled to the first end of the fifth capacitor, and the second end of the fifth capacitor is coupled to the second end of the sixth resistor.
4. The auto-discrimination light source current circuit according to claim 3, wherein the current signal feedback circuit comprises:
a first-stage amplifying circuit and a second-stage amplifying circuit;
the first-stage amplifying circuit comprises a third operational amplifier, a seventh resistor and an eighth resistor, wherein the negative input end of the third operational amplifier is coupled to the first end of the seventh resistor, the second end of the seventh resistor is grounded, the first end of the eighth resistor is coupled to the first end of the seventh resistor, and the second end of the eighth resistor is coupled to the output end of the third operational amplifier;
the second-stage amplification circuit comprises a fourth operational amplifier, a ninth resistor and a tenth resistor, wherein the negative input end of the fourth operational amplifier is coupled to the first end of the ninth resistor, the second end of the ninth resistor is grounded, the first end of the tenth resistor is coupled to the first end of the ninth resistor, the second end of the tenth resistor is coupled to the output end of the fourth operational amplifier, and the output end of the fourth operational amplifier is connected to the single chip microcomputer;
an output end of the third operational amplifier is coupled to a first end of an eleventh resistor, and a second end of the eleventh resistor is coupled to a positive input end of the fourth operational amplifier;
the positive input end of the third operational amplifier is coupled to the second end of a twelfth resistor, the first end of the twelfth resistor is coupled to the mos tube, the first end of the twelfth resistor is coupled to the first end of a thirteenth resistor, and the second end of the thirteenth resistor is coupled to the second end of a ninth resistor.
5. The automatic identification light source current circuit as claimed in claim 4, wherein the negative input terminal of the second operational amplifier is coupled to the second terminal of a fourteenth resistor, the second terminal of the fourteenth resistor is coupled to the first terminal of a fifteenth resistor, the second terminal of the fifteenth resistor is grounded, and the first terminal of the fourteenth resistor is connected to an external bias voltage;
the first end of the sixteenth resistor is coupled to the first end of the twelfth resistor, and the second end of the sixteenth resistor is coupled to the negative input end of the second operational amplifier.
6. The automatic identification light source current circuit as claimed in claim 5, further comprising a protection circuit in the constant current control circuit, wherein the protection circuit comprises a fifth operational amplifier, a seventeenth resistor, an eighteenth resistor and a sixth capacitor, a positive input terminal of the fifth operational amplifier is coupled to a second terminal of the seventeenth resistor, a second terminal of the seventeenth resistor is coupled to a first terminal of the eighteenth resistor, a second terminal of the eighteenth resistor is grounded, and a first terminal of the seventeenth resistor is coupled to a coupling terminal of the load light source and the mos transistor; a first end of the sixth capacitor is coupled to the positive input end of the fifth operational amplifier, and a second end of the sixth capacitor is coupled to a second end of the eighteenth resistor; and the output end of the fifth operational amplifier is connected to the singlechip.
7. The auto-discrimination light source current circuit according to claim 6, wherein a voltage divider circuit is coupled to a negative input terminal of the fifth operational amplifier.
8. The auto-discrimination light source current circuit according to claim 7, wherein the voltage dividing circuit includes a nineteenth resistor, a twentieth resistor, and a seventh capacitor; a first end of the nineteenth resistor is coupled to the negative input terminal of the fifth operational amplifier, a second end of the nineteenth resistor is coupled to the first end of the twentieth resistor, a second end of the twentieth resistor is grounded, a first end of the seventh capacitor is coupled to the first end of the twentieth resistor, and a second end of the seventh resistor is coupled to the second end of the twentieth resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020049838.0U CN211702482U (en) | 2020-01-10 | 2020-01-10 | Circuit capable of automatically identifying current of light source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020049838.0U CN211702482U (en) | 2020-01-10 | 2020-01-10 | Circuit capable of automatically identifying current of light source |
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| Publication Number | Publication Date |
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| CN211702482U true CN211702482U (en) | 2020-10-16 |
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| CN202020049838.0U Active CN211702482U (en) | 2020-01-10 | 2020-01-10 | Circuit capable of automatically identifying current of light source |
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