High-power switching power supply circuit with multiple outputs

Abstract

The invention relates to a high-power switching power supply circuit with multiple outputs. The high-power switching power supply circuit comprises an input rectifying and energy storage capacitive circuit, wherein an input end of the input rectifying and energy storage capacitive circuit is connected to alternating current, and an output end of the input rectifying and energy storage capacitive circuit is respectively connected with the input ends of an auxiliary power supply, a main power converting circuit and a control circuit; the auxiliary power supply provides electricity for the control circuit; an output end of the main power converting circuit is connected with the input ends of at least two output rectifying and filtering circuits; the output ends of the output rectifying and filtering circuits are connected with an input end of a BUCK circuit; an output end of the BUCK circuit is sampled and serves as an input of the control circuit; and a driving end of the control circuit is respectively connected with the main power converting circuit and the BUCK circuit. The BUCK circuit is relatively simple in structure, a control protection circuit of the BUCK circuit is easy to implement, the modularization design of the BUCK circuit is easy to implement, the structure is compact and the efficiency is high.

Description

technical field [0001] The invention relates to the field of switching power supplies, in particular to a high-power switching power supply circuit with multiple outputs. Background technique [0002] In the design and development of high-power switching power supplies, it is often required that the power supply has multiple outputs and each output requires a different ground. Usually, the design of this type of power supply often uses several outputs to be designed separately, or in one main output. The latter stage obtains the output required by other channels through an isolated DC-DC converter. When several outputs are designed separately, each output requires separate switching devices, isolation transformers, secondary rectification and filtering, control and auxiliary power supply circuits, which makes the power supply design cumbersome, takes up a large space, and has high cost and low reliability. ; When adopting a main circuit and several isolated DC-DC isolation...

AI Technical Summary

Problems solved by technology

When several outputs are designed separately, each output requires separate switching devices, isolation transformers, secondary side rectification and filtering, control and auxiliary power supply circuits, which makes the power supply design cumbersome, takes up a large space, and has high cost and low operating reliability. ; When adopting a main circuit and several isolated DC-DC isolation converters, although the circuit structure is relatively simple and the procurement of isolation modules is relatively easy, the price of the isolation modules is generally high, and the subsequent DC-DC isolation The introduction of the converter will lead to a reduction in the overall efficiency of the power supply, so its market competitiveness will be at a disadvantage in the current price- and energy-saving-oriented market

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