Combined type push-pull straight convertor

Abstract

The invention discloses a combined type push-pull straight convertor. The convertor comprises N path push-pull normal shock convertor modules, wherein the primary side of the convertor is in parallel connection and is arranged for bypassing flow and the assistant side of the convertor is arranged for superposing outputs so as to acquire a higher output voltage. The convertor has the advantages that the stable power output can be realized under the working condition of a higher output power demand, the efficiency is high because the advantage of push-pull normal shock convertor circuit is utilized, the input current of an external power supply is divided, the current in a power switch tube is decreased, the reliability of the system is promoted, and the difficulty and the complexity for choosing the power switch tube are decreased.

Description

1. Technical field [0001] The invention relates to a converter in a power conversion device, in particular to a straight-to-straight converter capable of operating under low-voltage input and high-power output conditions. 2. Background technology [0002] As an important part of the field of power electronics technology, direct-to-direct conversion is widely used in new energy generation and other aspects, so it has received a lot of research in recent years. However, in the case of high power conversion, especially in the application of converting low voltage to high voltage, the power current in the power switch tube in the direct-to-direct converter is relatively high, which has a negative impact on device selection and system stability. This limits the application of straight-to-straight converters in practical applications. The push-pull forward converter has the advantages of bidirectional excitation of the transformer core, high utilization of the core, low voltage s...

AI Technical Summary

Problems solved by technology

However, in the case of high power conversion, especially in the application of converting low voltage to high voltage, the power current in the power switch tube in the direct-to-direct converter is relatively high, which has a negative impact on device selection and system stability. Limits the application of straight-to-straight converters in practical applications

The push-pull forward converter has the advantages of bidirectional excitation of the transformer core, high utilization of the core, low voltage stress of the switch tube, and no additional magnetic reset circuit. However, in high-power low-voltage-high voltage applications, the power switch cannot be avoided. If the current value in the tube is too high, it will cause adverse effects on the circuit

For the push-pull forward converter of the traditional topology, since the output power of the converter is limited by the allowable current of the primary side power tube, it is also difficult to achieve a large power conversion output

At present, power switch tubes that can work under high output power conditions appear on the market, but the cost is relatively high, which affects the promotion and application of this technology

Images