CN-224204578-U - Constant current source driving circuit of laser

CN224204578UCN 224204578 UCN224204578 UCN 224204578UCN-224204578-U

Abstract

The utility model discloses a constant current source driving circuit of a laser, which comprises a switching power supply, a laser pumping source, a constant current source circuit, a switching circuit and a power control circuit, wherein the output end of the switching power supply is connected with the input end of the laser pumping source, the output end of the laser pumping source is connected with the input end of the constant current source circuit, the output end of the constant current source circuit is grounded, the first input end of the switching circuit is used for acquiring a switching control signal, the second input end of the switching circuit is connected with the output end of the power control circuit, the third input end of the switching circuit is used for acquiring a negative voltage driving signal, the output end of the switching circuit is connected with the control end of the constant current source circuit, and the switching circuit is used for controlling the disconnection between the third input end of the switching circuit and the output end of the switching circuit according to the switching control signal in the power-on stage and controlling the conduction between the second input end of the switching circuit and the output end of the switching circuit.

Inventors

MO JIE
WEI PENG
WANG LINHUA
ZHA CONGWEN
Zhu Dengchuan

Assignees

深圳市大族光子激光技术有限公司

Dates

Publication Date: 20260505
Application Date: 20250519

Claims (10)

1. A constant current source driving circuit of a laser, characterized in that the constant current source driving circuit comprises: The laser pumping device comprises a switching power supply, a laser pumping source, a constant current source circuit, a switching circuit and a power control circuit, wherein the output end of the switching power supply is connected with the input end of the laser pumping source, the output end of the laser pumping source is connected with the input end of the constant current source circuit, and the output end of the constant current source circuit is grounded; The first input end of the switching circuit is used for acquiring a switching control signal, the second input end of the switching circuit is connected with the output end of the power control circuit, the third input end of the switching circuit is used for acquiring a negative voltage driving signal, and the output end of the switching circuit is connected with the control end of the constant current source circuit; The switching circuit is used for controlling the disconnection between the third input end of the switching circuit and the output end of the switching circuit according to the switching control signal in the power-on stage, and controlling the conduction between the second input end of the switching circuit and the output end of the switching circuit.
2. The constant current source drive circuit according to claim 1, further comprising: The input end of the voltage detection circuit is connected with the output end of the switching power supply, the output end of the voltage detection circuit is connected with the first input end of the switching circuit, and the voltage detection circuit is used for outputting the switching control signal.
3. The constant current source drive circuit according to claim 2, wherein the voltage detection circuit includes: The input end of the current limiting resistor is used as the input end of the voltage detection circuit, the output end of the current limiting resistor is connected with the clamping end of the clamping module, and the clamping end of the clamping module is used as the output end of the voltage detection circuit.
4. The constant current source drive circuit according to claim 3, wherein the clamp block includes: The clamping device comprises a clamping diode, a first capacitor and a load resistor, wherein the cathode of the clamping diode is used as a clamping end of the clamping module, the anode of the clamping diode is connected with the ground, the first capacitor is connected with the clamping diode in parallel, and the load resistor is connected with the clamping diode in parallel.
5. The constant current source drive circuit according to claim 2, wherein the voltage detection circuit includes: The input end of the analog-to-digital converter is used as the input end of the voltage detection circuit, the output end of the analog-to-digital converter is connected with the input end of the processor, and the output end of the processor is used as the output end of the voltage detection circuit.
6. The constant current source drive circuit according to any one of claims 1 to 5, wherein the switching circuit includes: The analog switch chip, the enabling end of analog switch chip is as the first input of switching circuit, the first input of analog switch chip is as the second input of switching circuit, the second input of analog switch chip is as the third input of switching circuit.
7. The constant current source drive circuit according to claim 1, wherein the power control circuit comprises: The power control circuit comprises a digital-to-analog converter and a follower, wherein the input end of the digital-to-analog converter is used as the input end of the power control circuit, the output end of the digital-to-analog converter is connected with the input end of the follower, and the output end of the follower is used as the output end of the power control circuit.
8. The constant current source drive circuit according to claim 1, wherein the constant current source circuit comprises: The switching circuit comprises a comparator, a driving switch, a voltage dividing module, a feedback module and a current detection module, wherein a first input end of the comparator is used for obtaining an output signal of an output end of the switching circuit, a second input end of the comparator is connected with an output end of the feedback module, and an output end of the comparator is connected with a first input end of the feedback module; The output end of the comparator is connected with the input end of the voltage dividing module, the output end of the voltage dividing module is grounded, the voltage dividing end of the voltage dividing module is connected with the control end of the driving switch, the input end of the driving switch is used as the input end of the constant current source circuit, the output end of the driving switch is connected with the input end of the current detecting module, and the output end of the current detecting module is connected with the second input end of the feedback module.
9. The constant current source drive circuit according to claim 8, wherein the feedback module includes: The input end of the first resistor is used as the second input end of the feedback module, the output end of the first resistor is connected with the output end of the second resistor, the output end of the second resistor is used as the output end of the feedback module, the input end of the second resistor is connected with the output end of the second capacitor, and the input end of the second capacitor is used as the first input end of the feedback module.
10. The constant current source drive circuit according to claim 8, wherein the voltage dividing module includes: The input end of the third resistor is used as the input end of the voltage dividing module, the output end of the third resistor is connected with the input end of the fourth resistor, the input end of the fourth resistor is used as the voltage dividing end of the voltage dividing module, and the output end of the fourth resistor is used as the output end of the voltage dividing module; The current detection module comprises a detection resistor, wherein the input end of the detection resistor is used as the input end of the current detection module, and the output end of the detection resistor is used as the output end of the current detection module.

Description

Constant current source driving circuit of laser Technical Field The utility model relates to the field of laser control, in particular to a constant current source driving circuit of a laser. Background As shown in fig. 1, the constant current source driving circuit of the existing laser generally comprises a switching power supply 20, a laser pumping source 21, a constant current source circuit 22 and a system power control circuit 23, wherein the switching power supply 20 converts commercial power AC voltage into direct current, the specific direct current voltage amplitude is determined according to the rated working voltage and the serial number of the used laser pumping source, the laser pumping source 21 converts electric energy into light energy, the pumping source can be used in series, the constant current source circuit 22 controls the current of the pumping source according to the given power control, and when the given power control is constant, the current of the pumping source is also constant. The constant current source circuit 22 is realized by controlling the conductive resistance of the MOSFET through a negative feedback and integration circuit so as to realize the adjustment of the current. The power control circuit 23 outputs an analog signal from the DAC, and the analog signal is supplied to the constant current source after being transmitted to the operational amplifier, so that the current of the constant current source is controlled. When the constant current source driving circuit in fig. 1 is powered on, it is assumed that the time when the switching power supply VDD voltage reaches the minimum operating voltage of the pumping source is t1, the time when the power supply voltage of the op amp reaches the operating voltage is t2, and when t1< t2, the constant current source circuit 22 outputs a high pulse current, so that the laser pumping source 21 emits laser, i.e., leaks light, which cannot be allowed. Therefore, the existing constant current source driving circuit has the problem of light leakage during the power-on period of the system. Disclosure of Invention The embodiment of the utility model provides a constant current source driving circuit of a laser, which aims to solve the problem of light leakage existing in the power-on period of a system of the conventional constant current source driving circuit. In one embodiment, there is provided a constant current source driving circuit of a laser, the constant current source driving circuit including: The laser pumping device comprises a switching power supply, a laser pumping source, a constant current source circuit, a switching circuit and a power control circuit, wherein the output end of the switching power supply is connected with the input end of the laser pumping source, the output end of the laser pumping source is connected with the input end of the constant current source circuit, and the output end of the constant current source circuit is grounded; The first input end of the switching circuit is used for acquiring a switching control signal, the second input end of the switching circuit is connected with the output end of the power control circuit, the third input end of the switching circuit is used for acquiring a negative voltage driving signal, and the output end of the switching circuit is connected with the control end of the constant current source circuit; The switching circuit is used for controlling the disconnection between the third input end of the switching circuit and the output end of the switching circuit according to the switching control signal in the power-on stage, and controlling the conduction between the second input end of the switching circuit and the output end of the switching circuit. In an embodiment, the constant current source driving circuit further includes: The input end of the voltage detection circuit is connected with the output end of the switching power supply, the output end of the voltage detection circuit is connected with the first input end of the switching circuit, and the voltage detection circuit is used for outputting the switching control signal. In one embodiment, the voltage detection circuit includes: The input end of the current limiting resistor is used as the input end of the voltage detection circuit, the output end of the current limiting resistor is connected with the clamping end of the clamping module, and the clamping end of the clamping module is used as the output end of the voltage detection circuit. In an embodiment, the clamping module includes: The clamping device comprises a clamping diode, a first capacitor and a load resistor, wherein the cathode of the clamping diode is used as a clamping end of the clamping module, the anode of the clamping diode is connected with the ground, the first capacitor is connected with the clamping diode in parallel, and the load resistor is connected with the clamping diode in parallel. In one embodiment, the vol