Double-port stable control method and circuit and bidirectional DC/DC power converter

Abstract

The invention relates to a double-port stable control method and circuit and a bidirectional DC / DC power converter, and belongs to the technical field of power converters. A controller of the controlcircuit provides a PWM control signal, a driving circuit is controlled to switch on or switch off a corresponding MOS in a switch tube power circuit, and a DC bus voltage VBus in certain stability andprecision is formed between the two ends of a DC bus side capacitor C via a DC bus side filtering circuit. The controller controls the driving circuit by carrying out under-voltage protection of an energy-storage unit when the voltage in the energy storage side is lower than the lower limit of the working voltage; carrying out overvoltage protection of the energy-storage unit when the voltage inthe energy storage side is higher than the upper limit of the working voltage; and limiting the maximal continuous charging / discharging current of the energy-storage unit via an ACM control algorithmwhen the voltage in the energy storage side is within the upper limit and the lower limit of the working voltage. PWM output control is combined with ACM control to realize double-port stable controlof the bidirectional DC / DC power converter, and the method and circuit are suitable for any type of bidirectional DC / DC power converter.

Description

technical field [0001] The invention relates to the field of power converters, in particular to a dual-port stable control method for a bidirectional DC / DC power converter and a control circuit thereof. Background technique [0002] In order to achieve bidirectional transmission of DC power, bidirectional DC / DC power converters are widely used in DC UPS power systems, aerospace power systems, electric vehicles and mobile power generation systems and other applications. In these application fields, bidirectional DC / DC power converters are used as interface converters, allowing energy storage devices such as supercapacitors to work in a wide voltage range, improving their energy utilization and service life, while bidirectional DC / DC power converters It can also be connected in series and parallel to increase its power capacity, making the configuration of energy storage units composed of supercapacitors more flexible. Functionally, the bidirectional DC / DC power converter can...

AI Technical Summary

Problems solved by technology

[0004] Although these control techniques can better meet the response performance of power converters to a certain extent, they all have at least one of the following disadvantages: 1) The control requirements for input voltage are ignored, and they cannot meet the requirements of bidirectional DC / DC power converters. Two-port stable control requirements; 2) At least two sets of independent controllers are required to realize the bidirectional power flow control of the bidirectional DC / DC power converter, that is, the control of the input and output terminals of the power converter requires a separate controller to separate control, resulting in unsmooth bidirectional power control switching; 3) The switching frequency of the system is changing, and there is output jitter

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