Auxiliary power supply circuit of wide-input-range power supply module

Abstract

The invention discloses an auxiliary power supply circuit of a wide-input-range power supply module. The auxiliary power supply circuit comprises a primary auxiliary power supply circuit and a secondary auxiliary power supply circuit, wherein the primary auxiliary power supply circuit and the secondary auxiliary power supply circuit adopt a forward and reverse excitation power supply mode, the primary auxiliary power supply circuit comprises an auxiliary winding T1D, the auxiliary winding T1D is wound by adopting a single winding, the secondary auxiliary power supply circuit comprises an auxiliary winding T1B and an auxiliary winding T1C, the auxiliary winding T1B and the auxiliary winding T1C are wound by adopting a mode of superposing a forward excitation winding and a flyback winding, the auxiliary winding T1B adopts a half turn, and the auxiliary winding T1C is an integral turn; the method can meet the power supply demand for the integrated circuit when full-range input is performed and is small in stress of the device when a high-end voltage input is performed.

Description

technical field [0001] The invention relates to the field of power electronics, and more specifically relates to the auxiliary power supply design for an AC / DC switching power supply or a DC / DC switching power supply with a wide input range. Background technique [0002] With the development of the system in the direction of integration and miniaturization, the requirements for switching power supplies are getting higher and higher, such as communication functions, digital-to-analog conversion functions, parallel functions, and display functions, etc., all of which require special chips In addition, there are chips inside the switching power supply. These chips need power supply to play a role. Some dedicated chips have higher requirements for power supply accuracy. If the fluctuation is too large, there may be failures. When designing the overall solution, the auxiliary power supply circuit It is necessary to meet the requirements of miniaturization and cost, but also to co...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention lies in the fact that the auxiliary power supply design of the prior art power supply module cannot meet the power supply requirements for the integrated circuit when the full-range input is input, and the device stress is relatively large when the high-end voltage is input.

Images