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Narrow-pulse-width high-power laser constant-current driving circuit and optical module

A constant current drive and laser technology, applied in lasers, laser parts, semiconductor lasers, etc., can solve the problems of limited application, difficult output current pulse width accurate control, etc., to improve quality, facilitate heat dissipation, and suppress current overshoot. Effect

Active Publication Date: 2021-08-13
CASI VISION TECH (BEIJING) CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These schemes are also difficult to achieve precise control of the output current pulse width, which limits its application

Method used

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  • Narrow-pulse-width high-power laser constant-current driving circuit and optical module
  • Narrow-pulse-width high-power laser constant-current driving circuit and optical module
  • Narrow-pulse-width high-power laser constant-current driving circuit and optical module

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] figure 1 It is the first circuit structure diagram of the narrow pulse width high power laser constant current drive circuit according to the embodiment of the present invention. Among them, the narrow pulse width and high power laser constant current driving circuit of this embodiment, the circuit implementation includes: the first resistor R1, the transistor M1, the operational amplifier U1, the first analog switch U2, the second resistor R2, the third resistor R3, the fourth Resistor R4, laser D1; the first resistor R1 is a current sampling resistor, the first terminal of which is connected to the power terminal, the second terminal is connected to the source of transistor 101; the first terminal of the second resistor R2 is connected to the source of transistor 101, the second The terminal is connected to the negative input terminal of the operational amplifier U1; the first terminal of the third resistor R3 is connected to the negative input terminal of the operati...

Embodiment 2

[0092] figure 2 It is the second circuit structure diagram of the narrow-pulse-width high-power laser constant-current drive circuit in the embodiment of the present invention. figure 2 The shown embodiment 2 is based on the embodiment 1, adding a signal adjustment circuit 102 . The signal adjustment circuit 102 is used to compensate the deep negative feedback circuit formed by the operational amplifier U1, the fifth resistor R5 and the third resistor R3 form a proportional amplification circuit, and the sixth resistor R6, the first capacitor C1 and the third resistor R3 form a The integral circuit plays the role of adjusting the signal of the deep negative feedback circuit.

[0093] Figure 7 It is a transient simulation waveform diagram of the second circuit of the narrow-pulse-width high-power laser constant-current drive circuit in the embodiment of the present invention. Exemplarily, in the signal adjustment circuit 102, the fifth resistor R5 is set to 200kΩ, the six...

Embodiment 3

[0096] image 3 It is the third circuit structure diagram of the narrow pulse width high power laser constant current driving circuit according to the embodiment of the present invention. like image 3 As shown, the narrow pulse width high power laser constant current drive circuit, the circuit implementation includes: first resistor R1, transistor M1, operational amplifier U1, first analog switch U2, second resistor R2, third resistor R3, fourth resistor R4 , laser D1, pulse shaping circuit 201; the first resistor R1 is a current sampling resistor, its first terminal is connected to the power supply terminal, and the second terminal is connected to the source of the transistor 101; the first terminal of the second resistor R2 is connected to the source of the transistor 101 , the second terminal is connected to the negative input terminal of the operational amplifier U1; the first terminal of the third resistor R3 is connected to the negative input terminal of the operationa...

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Abstract

The invention discloses a narrow-pulse-width high-power laser constant-current driving circuit and an optical module. The circuit comprises a first resistor, a transistor, an operational amplifier, a first analog switch, a second resistor, a third resistor, a fourth resistor and a laser. The first resistor comprises a current sampling resistor; the first terminal of the first resistor is connected with a power supply terminal, and the second terminal of the first resistor is connected with the source electrode of the transistor; the first terminal of the second resistor is connected with the source electrode of the transistor, and the second terminal of the second resistor is connected with the negative input end of the operational amplifier; and the first terminal of the third resistor is connected with the negative input end of the operational amplifier, and the second terminal of the third resistor is connected with the output terminal of the first analog switch. According to the circuit, a first analog switch U2 is modulated through a PWM signal to output a pulse width modulation voltage, so that the output current corresponds to a PWM waveform, and the purpose of constant-current driving of a narrow-pulse-width high-power laser is achieved.

Description

technical field [0001] The invention relates to the technical field of laser constant current drive circuits, in particular to a narrow pulse width high power laser constant current drive circuit and an optical module. Background technique [0002] Semiconductor lasers have been widely used in laser communication, laser marking, laser ranging, laser radar and other fields. One of the characteristics of semiconductor lasers is that they are driven by constant currents. Therefore, in order to generate lasers with high stability wavelengths, it is required to have high stability of constant currents, and the characteristics of small surge currents and no reverse overshoot currents. At present, there are many kinds of schemes for laser constant current drive circuits, but it is still difficult to find one that uses the output terminal of the laser to be grounded, and at the same time has the pulse width and amplitude of the current that can be adjusted arbitrarily, and has high ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S5/042
CPCH01S5/042H01S5/0427H01S5/0428
Inventor 胡肖松骈冰戢冰梁钦
Owner CASI VISION TECH (BEIJING) CO LTD