Laser driving circuit and control method thereof

Abstract

The invention discloses a laser driving circuit and a control method thereof. The laser driving circuit comprises a pulse-width modulation (PWM) circuit, a laser component and an operational amplifier detection circuit, wherein the PWM circuit consists of an inductor, a resonance capacitor and a switching tube, the inductor is connected with the switching tube in series, and the resonance capacitor is connected with the output end of a resonance inductor in parallel; the laser component consists of a (semiconductor) laser, a resistor and a field effect tube, and the output end of an operational amplifier is connected with the input end of a central processing unit (CPU); the anode of the laser of the driven laser component is connected to the negative pole of the inductor of the PWM circuit, while the cathode of the laser is connected with a resistor in series; and an operational amplifier input end in the operational amplifier detection circuit is connected to one end, connected withthe series connection resistor, of the negative pole of the laser. The invention provides a high-efficiency and low-power-consumption semiconductor laser diode (laser) driving circuit. By controllingthe amplitude of the direct-current output voltage of the PWM circuit, the power consumption of the drive circuit of the laser can be greatly reduced.

Description

technical field [0001] The invention relates to the collection of electrical quantity data in a power system, especially optical CT, PT and other related devices that need to collect primary side current and voltage signals through laser power supply. Background technique [0002] In the measurement of optical CT and PT signals, the laser on the low-voltage side is generally used to provide laser energy to the remote acquisition module on the high-voltage side through the high-voltage optical fiber to maintain the normal operation of the remote module on the high-voltage side. [0003] The low-voltage side laser controls the transmission of its optical power through a corresponding driving circuit. At present, optical CT usually uses traditional laser drive circuits such as figure 1 As shown, that is, the power supply voltage is +5V or +3.3V, and the laser drive current is controlled by adjusting the on-resistance of the power transistor Q1 in the laser drive circuit, so ...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a laser drive circuit that can replace the traditional laser drive circuit, which can overcome the disadvantages of low work efficiency, low efficacy, and large heat generation, thereby Improve the service life of the laser

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