反激变压器设计原理（Design principle of anti-excitation transformer）.docVIP

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反激变压器设计原理（Design principle of anti-excitation transformer）.doc

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反激变压器设计原理（Design principle of anti-excitation transformer）

反激变压器设计原理（Design principle of anti-excitation transformer） Default classification 2008-01-21 11:16 reading 273 comments 1: a small section of the big middle. Overview. The Flyback converter, also known as a single - end or spy-boost converter, gets its name from energy when its output is disconnected from the original windings. 1. Advantages of anti-excitation converter are: 1. The circuit is simple and can provide multi-channel dc output efficiently, so it is suitable for multi-group output. 2. High conversion efficiency and small loss. 3. The ratio of transformer turns is small. When the input voltage fluctuates within a large range, there is still a stable output, which is now available in between 85 and 265V. The requirement for stable output is not required to switch. The disadvantages of the anti-excitation converter are: 1. There is a large ripple in the output voltage, and the load adjustment is not high, so the output power is limited, and it is usually applied under 150W. 2. Switching transformer in current continuous mode (CCM) at work, have a large dc component, easily lead to core saturation, so must join the air gap in the magnetic circuit, resulting in the transformer size bigger. 3. The transformer has dc current, and will work in two modes of CCM/DCM. Therefore, the transformer is more difficult to design, and the number of times of repeated adjustment is more than that of the shunt-type, and the iterative process is more complicated. Section two: how it works In The isolated flyback converter, The Transformer T has The dual function of isolating and choking. Therefore, T is also called Transformer - choke. The working principle of The circuit is as follows: When switching transistor Tr ton, Np transformer current Ip, and the energy stored in the (E = LpIp / 2). Due to Np and Ns reverse polarity, the diode D is reverse biased and cut-off, no energy transmitted to the load. When switch Tr off by lenzs law: (E = - N delta Φ/delta T), the transformer p