System and method for high-voltage DCDC conversion circuit

Abstract

The invention discloses a system and method for a high-voltage DCDC conversion circuit. The system comprises a primary module, a voltage transformation module, a control module, a secondary module, a filtering module and a discharging module, the primary module transmits the input high-voltage DC energy to the secondary coil of the voltage transformation module, and limits the primary peak voltage caused by the leakage inductance of the voltage transformation module; the voltage transformation module supplies power to the control module; the control module is used for detecting and controlling the working state of the voltage transformation module in real time; the secondary module is used for rectifying the output voltage of the voltage transformation module into low-voltage direct current and feeding back the low-voltage direct current to the control module; the filtering module is used for reducing electromagnetic interference and reducing low-voltage direct-current ripples; and the discharging module is used for discharging. By using the system provided by the invention, the problem that the controller cannot work after low-voltage power failure is solved; the problem of high voltage resistance requirement of a high-voltage input flyback switching power supply MOSFET is solved; the problem that the power supply flows backward when the high-voltage DCDC works is solved; and the problem of high-voltage discharge is solved.

Description

technical field [0001] The invention belongs to the technical field of voltage conversion, and in particular relates to a system and method for a high-voltage DC-DC conversion circuit. Background technique [0002] A 12V low-voltage battery is provided in an electric vehicle to supply power to the electrical system of the vehicle. For the motor controller, if the low-voltage power supply in the electric vehicle is suddenly interrupted, and the electric vehicle is not allowed to be powered off at this time, it will easily lead to certain dangers during the driving of the vehicle; and because the high-voltage bus capacitor at this time There is still a large amount of electricity stored, and there is no active discharge, and there are certain potential safety hazards. [0003] In addition, the current electric vehicle system is basically a 400V voltage platform, but the trend is to develop to a level of 800V or even higher. After literature search and novelty search, the hig...

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Problems solved by technology

[0004] At present, high-voltage DCDC conversion circuits generally use switching power supplies, but the voltage of the 800V voltage platform is relatively high. The traditional single-ended flyback switching power supply is difficult to find a suitable automotive-grade MOS tube because the MOS tube has to withstand the highest input voltage.

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