Bidirectional DC (direct current)/DC conversion device

Abstract

The invention relates to a bidirectional DC (direct current) / DC conversion device which comprises a power conversion unit, an input voltage sampling unit, an output voltage sampling unit, a current sampling and processing unit, a PWM (pulse width modulation) controller unit and a function control unit, wherein the power conversion unit is used for the conversion of different voltages; the input voltage sampling unit is used for detecting a first voltage signal of a voltage bus at the input end; the output voltage sampling unit is used for detecting a second voltage signal at the output end of the power conversion unit to judge whether a battery unit is in a constant-current charge stage or a constant-voltage charge state and whether an undervoltage situation occurs in the discharge process; the current sampling and processing unit is used for detecting a current signal passing through the battery unit; the PWM controller unit is used for generating a PWM signal having a certain duty ratio and adjusting the duty ratio of the PWM signal according to a feedback signal to meet work requirements of a circuit; and the function control unit is used for sending out an enable / discharge permission signal and a charge permission signal to control the operation of the PWM controller unit. According to the invention, the circuit structure is very simple and reliable, and the cost is reduced.

Description

technical field [0001] The present application relates to a voltage conversion device, in particular to a bidirectional DC / DC conversion device suitable for electronic equipment and new energy batteries. Background technique [0002] In the high-voltage battery pack of new energy vehicles and energy storage systems, in order to ensure that the battery system has sufficient charge / discharge capacity and prolong the service life of the battery pack, it is necessary to effectively balance the individual cells connected in series in the high-voltage battery pack. Most of the existing equalization technologies realize passive discharge equalization through resistance discharge. This is a one-way energy consumption equalization method. Can cause heat problems. [0003] At present, isolated bidirectional DC / DC converters are mainly used in solar energy storage control systems, electric vehicle motor drive and energy feedback systems, most of which are controlled by single-chip or ...

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Problems solved by technology

[0004] In view of the problems existing in the prior art, the purpose of this application is to provide a bidirectional DC / DC conversion device to solve the problem of electromagnetic compatibility that may be introduced by using high transformation ratio and floating windings in the prior art

[0005] Another object of the present application is to provide a bidirectional DC / DC conversion device, which can solve the existing problems in the prior art that can only control the output voltage and current, but cannot meet the requirements of battery discharge balance. The bidirectional DC / DC converter can also control its The application requirements of the discharge current

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