Two-stage input boost type DC constant-voltage output converter

Abstract

The invention discloses a two-stage input boost type DC constant-voltage output converter. The converter comprises 12V or 24V low-voltage power source input, an auxiliary power source circuit, an automatic frequency switching circuit, a PWM control circuit and a boost output rectifying and filtering circuit; and the converter further comprises an electric potential logic protection circuit, a push-pull boost topological circuit and an output constant voltage automatic switching circuit. According to the two-stage input boost type DC constant-voltage output converter of the present invention, an electric potential logic monitoring circuit can perform judgment according to different states of busbar voltage such as an undervoltage state, an overvoltage state and a normal state, so that a PWMmodule can be controlled, and the start and stop of the entire circuit can be controlled; the output constant voltage automatic switching circuit ensures safe and stable voltage output under different input voltages; a special winding distribution design is realized for a high-frequency boost transformer connected with the push-pull topological circuit, so that the two-stage input boost type DC constant-voltage output converter can adapt to two different input voltages; and the constant voltage output automatic switching circuit behind the boost transformer ensures constant voltage output under different inputs.

Description

technical field [0001] The invention relates to the technical field of constant voltage output circuit design, in particular to a dual-stage input boost type DC constant voltage output converter. Background technique [0002] With the rise of green renewable energy such as photovoltaic power generation, the application of inverter power supply and related research are becoming more and more extensive and in-depth. It is widely used in home, company server, satellite relay station and even aerospace industry. The boost circuit is a key part of the inverter power supply, and its key indicators such as working stability, safety, and response sensitivity all affect the normal operation of the entire inverter power supply system. [0003] Multi-input step-up DC constant voltage output converter is a common component in inverter power supply. In the boost circuit, the commonly used methods are: Push-Pull (push-pull topology), Weinberg Circuit (Weinberg circuit topology), Half-Br...

AI Technical Summary

Problems solved by technology

In the case of the same performance, the response of the single-chip software programming method will not be as timely as the hardware circuit method, and it is not easy to integrate, and the implementation cost of the overall circuit is relatively high

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