compact pwm fiber optic converter

Abstract

The invention relates to a compact type PWM (pulse-width modulation) optical fiber converter, which comprises a shell, a circuit board and a power supply module, wherein the circuit board and the power supply module are installed inside the shell; and the circuit board is provided with a power supply converting circuit, a PWM level converting circuit, a PWM converting circuit and a PWM feedback converting circuit, wherein the input end of the power supply converting circuit is connected with the power supply module. The compact type optical fiber converter adopts a modulation design; a PWM level signal is converted into an optical signal through the PWM level converting circuit and the PWM converting circuit and the optical signal is converted into a PWM level signal through the PWM feedback converting circuit, so the mutual conversion between the PWM level signal and the optical signal is realized; furthermore, two upper and lower IGBTs (insulated gate bipolar translators) of one same bridge arm adopt communication interlocking connection, so that the condition that the one same bridge arm is communicated at the same time is prevented, the GBT miscommunication caused by factors such as interference during the transmission process of the PWM signal is changed, and the fault rate of the IGBT is reduced; and meanwhile, the power supply converting circuit can provide two kinds of power supply output synchronously.

Description

technical field [0001] The invention relates to an optical fiber converter, in particular to an optical fiber converter used in high-speed EMUs and urban rail trains driven by IGBTs. Background technique [0002] Optical fiber has the characteristics of wide transmission frequency, high speed, low transmission loss, long transmission distance, good anti-lightning and electromagnetic interference performance, low transmission bit error rate, high reliability, small size, light weight, etc., and is widely used in communication . At present, in high-speed EMU trains and urban rail trains, most IGBT power modules are driven by optical fiber transmission. The basic modes include PWM generators, PWM photoelectric converters, optical fiber transmission, and IGBT drivers, such as figure 1 As shown, but the integration degree of the photoelectric conversion part is not high, and the interference and other factors during the transmission of the PWM signal may easily cause the IGBT to...

AI Technical Summary

Problems solved by technology

At present, in high-speed EMU trains and urban rail trains, most IGBT power modules are driven by optical fiber transmission. The basic modes include PWM generators, PWM photoelectric converters, optical fiber transmission, and IGBT drivers, such as figure 1 As shown, but the photoelectric conversion part is not highly integrated, and the PWM signal is likely to cause misconduct of the IGBT due to interference and other factors during the transmission process, and the IGBT failure rate is high

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