Low standby power loss high-power full-bridge phase shift power supply

Abstract

The invention relates to a power supply and discloses a low standby power loss high-power full-bridge phase shift power supply which comprises a high-power full-bridge phase shift circuit, wherein the high-power full-bridge phase shift circuit is connected with at least one auxiliary power circuit in parallel for supplying power to a load; an output loop is connected with a current sampling circuit, and the current sampling circuit is coupled with a control circuit; the control circuit is used for controlling an input circuit; and the input circuit is connected with the high-power full-bridge phase shift circuit through a PFC (Power Factor Correction) circuit. The low standby power loss high-power full-bridge phase shift power supply has the advantage of low power loss of a complete machine under the condition of no load and light load.

Description

technical field [0001] The invention relates to a power supply, in particular to a high-power full-bridge phase-shifting power supply with low standby power consumption. Background technique [0002] At present, the power of traditional consumer power supply is generally below 200W, and the power of driving power supply for LED street lighting does not exceed 400W. Most of the topology technologies used are single-ended flyback, quasi-resonant or LLC half-bridge resonant technology. Power supplies using this technology have excellent electrical characteristics and high cost performance. For high-power 3KW and above centralized control redundant power supply, there is no advantage in adopting the above technology, and it is difficult to optimize the efficiency, reliability, volume and cost of the power supply. Technology, using the output capacitance of the power MOS tube and the leakage inductance of the output transformer as the resonant element, so that the four switching...

AI Technical Summary

Problems solved by technology

For high-power 3KW and above centralized control redundant power supply, there is no advantage in adopting the above technology, and it is difficult to optimize the efficiency, reliability, volume and cost of the power supply. Technology, using the output capacitance of the power MOS tube and the leakage inductance of the output transformer as the resonant element, so that the four switching tubes of the full-bridge PWM converter are turned on at zero voltage and turned off at zero current in sequence to realize constant frequency soft switching. Known as ZVS / ZCS quasi-resonant technology

Due to the reduced switching process loss, the overall efficiency of the entire converter can be guaranteed to reach more than 90%. However, the disadvantage of this circuit is that the power consumption of light load and no load is relatively large, and the power consumption of PFC plus the power consumption of the phase-shifted full bridge makes the The shortcomings of this high-power power supply are prominent

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