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A High Efficiency and Wide Operating Voltage Constant Current Driving Circuit for Semiconductor Laser

A technology driven by working voltage and constant current, which is applied in the direction of semiconductor lasers, lasers, laser components, etc., can solve problems such as complex circuits, high noise, and high temperature of field effect tubes, and achieve high signal quality, high work efficiency, and high stability degree of effect

Active Publication Date: 2021-07-30
安菲腾(常州)光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the difference between the supply voltage and the LD voltage should not be too large, otherwise it will affect the working efficiency of the circuit, cause the temperature of the field effect tube to be too high, and reduce the ability of the circuit to provide current
However, the discrete PWM voltage regulating circuit has the disadvantages of complex circuit, difficult optimization, large volume and large noise.

Method used

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  • A High Efficiency and Wide Operating Voltage Constant Current Driving Circuit for Semiconductor Laser
  • A High Efficiency and Wide Operating Voltage Constant Current Driving Circuit for Semiconductor Laser
  • A High Efficiency and Wide Operating Voltage Constant Current Driving Circuit for Semiconductor Laser

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Such as Figure 4 As shown, U3 is an integrated operational amplifier chip LMH6612, the load current is sampled by resistors R10, R12, R72, and R73, and the current feedback signal ISENSE is amplified by U3;

[0036] Such as Figure 5 As shown, U9 is an analog switch chip SN74LVC1G3157. The current setting signals (S1_BUF, S2_BUF) and the current modulation signal (SW_BUF) of the current setting signals S1, S2 and modulation signal SW provided by the user pass through the buffer circuit to obtain the current setting signal after passing through U9. ISET;

[0037] Such as image 3As shown, the current setting signal ISET and the current feedback signal ISENSE enter the comparator constructed by U3, generate the load voltage adjustment signal FB_I, and provide an adjustment current through the resistor R23, and the current passes through the resistor R3 to GND to generate a current on R3 The voltage Vfb1; and the load voltage LD+ is divided by the resistors R2 and R3 t...

Embodiment 2

[0039] Such as Figure 7 As shown, U11 is a high-speed, high-precision temperature sensor chip LMT87, U10 is an integrated comparator chip LM2903, and Q5 is a triode MMBT2222A. U10 and resistors R54, R55, R56, R57, R58 form a hysteresis comparator, and Q5 forms a reverse switch. U11 monitors the voltage on the board and its output is connected to U10 pin 6 through resistor R54. When the temperature of the monitoring point is greater than 72 degrees, the TEMP_EN signal changes from high level to low level, U1 stops working, and the output is prohibited. At this time, other parts of the circuit continue to work to ensure rapid heat dissipation of the circuit; when the temperature of the monitoring point is lower than 27 degrees When the TEMP_EN signal changes from low level to high level, U1 is enabled and provides working voltage;

[0040] Such as Image 6 As shown, VUVLO is connected to pin 28 of U1, Q6 and Q7 are transistors MMBT2222A, which constitute two reverse switches...

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Abstract

The invention relates to a semiconductor laser constant current drive circuit with high efficiency and wide working voltage, including: power supply, integrated synchronous step-down controller, PWM voltage regulation and filtering, constant current control circuit, temperature protection module, soft start frequency control module, A circuit sampling module, a modulation signal module and an enabling signal module; the circuit sampling module is connected to a constant current control circuit, the constant current control circuit is connected to an integrated synchronous step-down controller, and the integrated synchronous step-down controller is connected to a PWM Voltage regulation and filter connection. The circuit introduces LD current feedback into the feedback loop of the integrated synchronous step-down controller, controls the integrated synchronous step-down controller, and realizes the constant current drive of the LD. It is suitable for a wide range of LD operating voltages. The circuit has high integration, high stability, and high signal quality. The current ripple is less than 1% in the entire operating voltage range.

Description

technical field [0001] The invention relates to a semiconductor laser constant current drive circuit with high efficiency and wide operating voltage, belonging to the technical field of industrial processing. Background technique [0002] The semiconductor laser constant current source drive is realized by controlling the field effect transistor gate voltage, and the voltage difference between its power supply voltage and the LD (laser diode / semiconductor laser) operating voltage will be added between the drain and source of the field effect transistor. Therefore, the difference between the supply voltage and the LD voltage cannot be too large, otherwise it will affect the working efficiency of the circuit, cause the temperature of the field effect tube to be too high, and reduce the ability of the circuit to provide current. However, the discrete PWM voltage regulating circuit has the disadvantages of complex circuit, difficult optimization, large volume and large noise. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S5/042H02M1/36H02M3/00
CPCH01S5/042H01S5/0427H01S5/0428H02M1/36H02M3/00
Inventor 邹正峰
Owner 安菲腾(常州)光电科技有限公司
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