Isolated parallel CUK push-pull topology

Abstract

The invention discloses an isolated parallel CUK push-pull topology. A positive electrode of an input DC power supply U<1N> is simultaneously connected with a drain of a power electronic switch T1 and a dotted end of a primary winding N12 of a transformer TR, a non-dotted end of the primary winding N12 is simultaneously connected with a drain of a power electronic switch T2 and one end of a capacitor Ci, the other end of the capacitor Ci is simultaneously connected with a non-dotted end of a primary winding N11 of the transformer TR and a source of the power electronic switch T1, a dotted end of the primary winding N11 is simultaneously connected with a source of the power electronic switch T2 and a negative electrode of the input DC power supply U<1N>, a secondary winding N2 of the transformer TR supplies power to a load, and the power electronic switch T1 and the power electronic switch T2 both employ GaN transistors and are controlled to be alternatively conducted or cut off by an input control pulse. The topology is isolated, has good electric shock prevention safety, can output alternating current and is small in input ripple and output ripple, the problem of DC magnetic biasing can be solved, the negative influence of leakage inductance can be overcome, and the power efficiency can reach 0.95 or above.

Description

technical field [0001] The invention belongs to the technical field of power supplies, in particular to an isolated parallel CUK push-pull topology. Background technique [0002] Traditional non-isolated topologies include step-down BUCK, step-up BOOST, buck-boost BUCK-BOOST, CUK, Sepic, and Zeta. The step-down BUCK can only step down but not boost, and the output and input have the same polarity Characteristic, large input current pulsation, small output current pulsation, simple structure, used in various step-down switching regulators. The boost type BOOST can only boost the voltage but not step down, the output and input have the same polarity, the input current ripple is small, the output current ripple is large, it cannot work without load, and the structure is simple. It is used in boost switching regulators, boost type Power Factor Correction Circuit (PFC). The buck-boost type BUCK-BOOST can step down and boost the voltage, the output is opposite to the input polar...

AI Technical Summary

Problems solved by technology

[0015] ⑤ Disadvantages: The traditional non-isolated CUK topology can only output DC, and it is reverse polarity DC, and cannot output AC, which limits the flexibility of use

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