The highly关注的 DC switching power supply technology field involves the simultaneous development of related power electronic devices and switching frequency conversion techniques, with both mutually promoting and driving the annual growth of DC switching power supplies at a rate exceeding two digits towards miniaturization, compactness, low noise, high reliability, and strong anti-interference capabilities. DC switching power supplies can generally be divided into isolated and non-isolated types, with isolated models necessarily including a switching transformer, while non-isolated ones may not. They are categorized into AC/DC and DC/DC types, with DC/DC converters now modularized and with design technology and production processes both mature and standardized at home and abroad, having gained user approval. However, the modularization of AC/DC converters faces more complex technical and manufacturing challenges due to their inherent characteristics. AC/DC conversion involves converting AC to DC, where power flow can be bidirectional; power flow from the power supply to the load is termed "rectification," while power flow from the load back to the power supply is called "active inverting." 36V aviation power supply, 400HZ frequency conversion power supply, 115/200V power supply, 27V DC power supply, 400HZ power supply, aviation power supply.
The AC/DC converter requires an input of 50/60Hz AC power, which necessitates rectification and filtering, thus making relatively large filter capacitors indispensable. Additionally, due to safety standards (such as UL, CCEE) and EMC directives (such as IEC, FCC, CSA) limitations, the AC input side must incorporate EMC filtering and use components that comply with safety standards, which in turn limits the miniaturization of the AC/DC power supply. Furthermore, the internal high-frequency, high-voltage, and large current switching actions increase the difficulty of solving EMC electromagnetic compatibility issues, demanding highly dense internal circuit design. For the same reason, high voltage and large current switches lead to increased power consumption, restricting the modularization process of the AC/DC converter. Therefore, it is imperative to adopt optimized power system design methods to achieve a satisfactory level of efficiency. The AC/DC converter can be categorized by circuit wiring methods into: half-wave circuits, full-wave circuits. By power phase, it can be divided into: single-phase, three-phase, multi-phase. And by circuit operating quadrant, it can be further divided into: first quadrant, second quadrant, third quadrant, and fourth quadrant.
