Converter

Abstract

An object of the present invention is to obtain a converter capable of suppressing instantaneous voltage fluctuations and outputting desired DC power with high accuracy. A power conversion unit 11 for power conversion of the supplied power; a smoothing filter 12 for smoothing the power converted by the power; a voltage detector 8 for detecting the voltage of the smoothed power; The output voltage of the voltage detector 8 becomes a desired voltage value, and the control unit 17 outputs a pulse signal for controlling the conduction ratio of the switching elements in the power conversion unit 11 . When the output voltage rises to the first predetermined voltage, the control unit 17 temporarily stops the power supply so that the output voltage from the voltage detector 8 does not exceed a desired voltage value and becomes an overvoltage, and when the power supply is stopped, when When the output voltage is lower than the second predetermined voltage, the power supply is restarted so that the output voltage from the voltage detector 8 does not drop below a desired voltage value and becomes a low voltage.

Description

technical field [0001] The present invention relates to a converter, and more particularly to a DC / DC converter or an AC / DC converter that prevents instantaneous voltage fluctuations in the output voltage by temporarily stopping and restarting power conversion, and supplies a desired DC voltage to the output side device. Background technique [0002] In the system configuration of conventional DC / DC converters for electric vehicles, the output voltage reference generated from the microcomputer is compared with the output voltage detection value, and the conduction rate of the switching element is controlled so that the output voltage matches the voltage reference ( For example, refer to Non-Patent Document 1). [0003] The allowable variation range of the domestically oriented output voltage standard described in the above-mentioned Non-Patent Document 1 is within ±10%. Generally, the range of voltage variation in foreign standards is only allowed to be about ±1%. If compa...

AI Technical Summary

Problems solved by technology

[0005] With the conventional method, for instantaneous voltage fluctuations, it is necessary to increase the switching frequency to increase the control response speed, or to increase the capacitance of the smoothing capacitor to alleviate the influence of voltage fluctuations, or to add hardware for overvoltage prevention, and to deal with this. If the high-precision standard is used, there is a problem of increasing the size of the device and increasing the cost

[0006] The present invention is proposed to solve related problems, and the purpose is to obtain a converter, which can not increase the switching frequency, and will not be damaged due to the increase of the capacitance of the smoothing capacitor and the addition of hardware for preventing overvoltage. Causes an increase in device size and cost, can suppress instantaneous voltage fluctuations, and can output desired DC power with high precision

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