Overview:
High-power AC/DC high-frequency switching power supplies are widely used in the communications industry, power industry, industry, military, aerospace and other fields. Single-machine power from several hundred watts to several hundred kilowatts, intelligent, n+1 redundancy mode, high efficiency, high power density, full digital, etc. are its distinctive features.
The active clamp full-bridge circuit suppresses the spikes and oscillations caused by the reverse recovery of the secondary rectifier (in other words, the "soft switching" of the secondary rectifier), but the bridge power device is still in a hard switching environment. Work (that is, the soft switch such as ZVS and ZCS is not realized). As the market continues to improve the efficiency and power density of the power supply, in the engineering design, the switching frequency fs is also continuously improved due to the switching loss and switching of the power device. The frequency is proportional, which makes it harder and harder to hard-switch the full-bridge circuit in high-power applications. In order to solve the switching loss of the high-frequency bridge power device, various soft-switching topologies such as ZVS and ZCS appear, and the phase shift is complete. The bridge circuit is one of them. In engineering, there are more mature applications: (1) passive clamp phase-shifted full-bridge circuit 1; (2) passive clamp-displacement phase full-bridge circuit 2; (3) active clamp displacement phase Bridge circuit; (4) There is also a kind of - finite bipolar control ZVZCS circuit, I do not know the calculation of the scope of the phase shift full bridge, please also make a conclusion.
Passive clamp displacement phase full bridge circuit diagram (1) 
Feature Description: Since the original secondary side also increases the clamp circuit, the spikes and oscillations on the secondary rectifier are greatly suppressed, EMI improvement, efficiency improvement, and so on. In engineering applications, due to the existence of transformer leakage inductance, circuit distribution parameters, etc., the suppression effect is still significantly different from that of active clamp and resonant "double soft" circuits, and the ZVS range of the lag bridge arm is also compared. narrow.
Passive clamp displacement phase full bridge circuit diagram (2) 
Feature Description: L1 is the coupled inductor. Since the clamp circuit is added to the primary and secondary sides, the peaks and oscillations on the secondary rectifier are greatly suppressed, and EMI is improved, efficiency is improved, and the like. In engineering applications, due to the existence of transformer leakage inductance, circuit distribution parameters, etc., the suppression effect is still significantly different from that of active clamp and resonant “double soft†circuits, and the ZVS range of the lag bridge arm is also narrow. .
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Ceramic capacitor (ceramic capacitor);Ceramic condenser) is also known as porcelain capacitor or monolithic capacitors.As the name implies, ceramic dielectric vessel is a ceramic capacitor with dielectric material.According to different ceramic materials, this kind of capacitor can be divided into low-frequency porcelain dielectric vessel with capacity of 1-300 pF and high-frequency porcelain dielectric vessel with capacity of 300-22 000 pF.According to the structure type classification, can be divided into picture capacitor, tubular capacitor, rectangular capacitor, chip capacitor, piercing capacitor and so on.
Ceramic Capacitor,White Ceramic Capacitor,Smd Ceramic Capacitor,Multilayer Chip Ceramic Capacitor
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