A magnetic reset control method and an isolation converter

Abstract

Embodiments of the present invention relate to the field of electronic power technology, and in particular to a magnetic reset control method and an isolation converter. An embodiment of the present invention provides a magnetic reset control method and an isolated converter, the method includes obtaining the first current at the start of excitation, the second current at the end of excitation, and the third current at the start of demagnetization within the same working cycle and the fourth current at the end of demagnetization; according to the first current, the second current, the third current, and the fourth current, obtain a current component difference; according to the current component difference, obtain Duty ratio adjustment amount: according to the duty ratio adjustment amount, the excitation signal and demagnetization signal of the isolated converter are adjusted. The method adjusts the excitation signal and the demagnetization signal through the circuit component difference between the excitation stage and the demagnetization stage, and realizes magnetic reset. It can be seen that the sampling and control method is not only simple, but also easy to implement.

Description

technical field [0001] Embodiments of the present invention relate to the technical field of electronic power, and in particular to a magnetic reset control method and an isolation converter. Background technique [0002] In recent years, power electronics technology has developed rapidly. In automotive power supply, photovoltaic power generation, energy storage, wind power generation and other application products, with the increasing demand for high frequency, in order to meet the needs of safety regulations and miniaturization, most of them use high-frequency The primary and secondary sides of the frequency transformer are isolated, and the two-way excitation of the transformer faces the problem of magnetic reset. [0003] Common magnetic reset control methods include: ①: peak current control method, which uses the peak current control method to achieve magnetic reset with its own magnetic reset capability, but the control strategy of this method is complex, difficult to ...

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Problems solved by technology

[0003] Common magnetic reset control methods include: ①: peak current control method, which uses the peak current control method to achieve magnetic reset with its own magnetic reset capability, but the control strategy of this method is complex, difficult to implement, and has high requirements for the controller; ②: detection of integral current Perform magnetic reset: Sampling the excitation current and demagnetization current by means of integration, and then realize magnetic reset according to the difference. Using a digital solution to realize integral current sampling consumes a lot of CPU resources, and using analog sampling requires adding a large inertial filter, which not only delays More and it is easy to cause insufficient system phase margin. It can be seen that the integral current sampling is difficult to achieve

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