Magnetic integration circuit for multiphase staggering flyback converter and controlling method thereof

Abstract

The invention discloses a magnetic integrating circuit of a poly-phase alternating expression returning convertor and a method for controlling the convertor. The convertor comprises a transformer, a first primary side coil with a first end, a first secondary side coil with the first end, a second primary side coil with the first end and a second end and a second secondary side coil with the firstend and the second end, wherein the first end of the first primary side coil has same polarity with the first end of the first secondary side coil, the second end of the second primary side coil and the second end of the second secondary side coil respectively, chain waves of channel current of the convertor are eliminated, the magnetic integrating circuit also comprises an output capacitance with the first end and the second end, wherein the first end is earthed, and the second end is coupled with the second end of the first secondary side coil and the second end of the second secondary sidecoil. The magnetic integrating circuit exerts original effects of the alternating expression returning convertor, which enables the convertor to be applied in occasions with higher power, and the circuit has the advantages that not only the loss of diffusion magnetic flux is reduced and the utilization factor of iron is improved, but also the parallel connection of original multiple channels is reserved.

Description

technical field [0001] The invention relates to a magnetic integrated circuit (Magnetic Integrated Circuit) of a two-phase interleaved flyback converter (Two-phase Interleaved Flyback Converter) and a control method for a multiphase interleaved flyback converter (Multiphase Interleaved Flyback Converter) . In particular, it refers to a multi-phase interleaved flyback converter with a transformer including multiple primary side coils and multiple secondary side coils. Background technique [0002] Flyback converters have the advantages of simple structure and low cost, and are widely used in devices such as adapters. As shown in Figure 1(a), it is a circuit diagram showing a flyback converter in the known technology, which includes a transformer T, a switch SW, a diode D and an output capacitor C for receiving a DC input voltage Vin and an output voltage Vout. And Fig. 1 (b) is a schematic circuit diagram showing a flyback converter with a magnetic core (magnetic core: mc)...

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Problems solved by technology

[0004] However, the above-mentioned interleaved flyback converter does not improve the current chain wave on each channel, which will become an important obstacle to improve the efficiency and reduce the size of the power supply.

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