Characteristics of high-frequency switching power supply modules
High-frequency switching power supply module is composed of a large number of resistors, capacitors, power electronic devices, etc. in accordance with certain circuitry, in the process of power conversion, always produce a certain amount of power loss, and power loss is usually emitted in the form of heat, so that the temperature of the power module rises. Excessive temperature rise on the life of the module has a great impact, the higher the operating temperature of the module, the lower the performance and reliability, the shorter the service life. Therefore, in addition to take a high reliability of the circuit way, but also must choose the appropriate way of heat dissipation, effectively reduce the temperature rise of high-frequency switching power supply module to ensure that the service life. Currently used in electric power DC system of high-frequency switching power supply module, the main use of forced air-cooled and natural cooling of the two ways of heat dissipation.
High-frequency switching power supply module features
1, high efficiency: fully realise zero voltage and zero current switching within the full load range, ensure that the switching tube does not have any turn-off spike, the current is pure sine wave, switching loss is very small; the output rectifier voltage stress is very low, no reverse current.
2,Small volume: the efficiency of the transducer is very high, compared with the traditional pWM switching power supply topology scheme, the heat sink volume can be reduced by half.
3, high reliability: through the use of domestic leading process optimisation design, perfect protection and alarm measures and the selection of high-quality and highly reliable imported devices, to achieve the perfect combination of low electromagnetic interference in this.
4, long life: due to the low temperature, can significantly delay the aging speed of components, thus improving the product life cycle;
Principle of high-frequency switching power supply module
High-frequency switching module adopts passive pFC technology and advanced pulse width modulation control technology (pWM), which makes the module efficiency further improved and harmonics reduced. The module adopts AC three-phase, three-wire 380VAC balanced input mode, there is no mid-wire current loss. Module AC input through the spike suppression circuit and EMI absorption circuit, through the full-bridge rectifier filter circuit will be three-phase AC voltage rectification for pulsating DC voltage, by the high-frequency pulse width modulation converter converted into high-frequency square wave voltage, and then by the output rectifier filter circuit, to get a stable output voltage and current, in the grid voltage and load changes feedback adjustment circuit control pulse width modulation circuit to adjust the pulse width width, make the output voltage and current remain stable, and make the output voltage and current remain stable, and make the module efficiency further reduced. When the grid voltage and load change, the feedback adjustment circuit controls the pulse width modulation circuit and adjusts the pulse width to keep the output voltage and current stable.
