An interleaved parallel double-forward voltage boosting circuit

Abstract

The invention relates to an interleaved parallel double-forward voltage boosting circuit, comprises an input filter circuit, an interleaved forward circuit and an output filter circuit, wherein the input end of the input filter circuit is connected with a DC input end, the output end of the input filter circuit is connected with the input end of the interleaved forward circuit, and the output endof the interleaved forward circuit is connected with a load through the output filter circuit. As that circuit structure of the invention is simple. The advantages of high reliability, high power density and high efficiency are especially suitable for the application of low-voltage DC input and high-voltage and high-current output, which can solve the problem that the rated peak current of interleaved forward converter is half of that of single-ended forward converter when the total output power is the same and there is no flux imbalance. Under the same ripple current condition, the value of output filter inductor can be reduced by half. The smaller the peak value of output voltage is, the smaller the voltage stress of power device is.

Description

technical field [0001] The invention relates to the field of power supply design, in particular to an interleaved parallel double forward boost circuit. Background technique [0002] Single-ended forward and push-pull circuit topologies are widely used, but they also have obvious disadvantages: the single-ended forward transformer works in one quadrant, the transformer utilization rate is low, and a magnetic reset winding is required, but there is no imbalance problem, and high Magnetic permeability, low loss soft magnetic core. [0003] The primary and secondary windings of the push-pull circuit transformer need to be divided into two windings, which increases the difficulty of transformer design, and the push-pull circuit is unbalanced, and it is easy to "bias". To solve the problem of bias, one method is to use the peak value of the primary winding For current control, another method is to use iron core materials with high saturation magnetic induction intensity. These t...

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Problems solved by technology

[0002] Single-ended forward and push-pull circuit topologies are widely used, but they also have obvious disadvantages: the single-ended forward transformer works in one quadrant, the transformer utilization rate is low, and a magnetic reset winding is required, but there is no imbalance problem, and high Magnetic permeability, low loss soft magnetic core

[0003] The primary and secondary windings of the push-pull circuit transformer need to be divided into two windings, which increases the difficulty of transformer design, and the push-pull circuit is unbalanced, and it is easy to "bias". To solve the problem of bias, one method is to use the peak value of the primary winding For current control, another method is to use iron core materials with high saturation magnetic induction intensity. These two methods, the first method makes the circuit complex, and the other method increases the volume of the transformer; especially when power density and efficiency requirements are required In high occasions, single-ended forward and push-pull circuits can no longer meet the needs

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