An Auxiliary Power Circuit Based on Power Management Chip ld7536

Abstract

An auxiliary power supply circuit based on a power management chip LD7536, including an LD7536 chip circuit, an external switch control circuit, an output control circuit, a loop feedback circuit, a flyback transformer and an auxiliary power supply output circuit. The auxiliary power supply output circuit is connected with the secondary winding of the flyback transformer for outputting auxiliary power, and the output control circuit is connected between the LD7536 chip and the primary main winding of the flyback transformer for controlling the primary main winding of the flyback transformer Charge and discharge are controlled by switch, the loop feedback circuit is used to sample the charge and discharge current of the primary winding of the flyback transformer, and feed back to the LD7536 chip, and the external switch control circuit is used to control the startup or shutdown of the LD7536 chip. Because the auxiliary power source is controlled by the external switch control circuit, the auxiliary power circuit based on the power management chip LD7536 can control the switch of the weak current end at the strong end and ensure stable auxiliary power output.

Description

technical field [0001] The technical field of switching power supply of the present invention particularly relates to an auxiliary power supply circuit based on a power management chip LD7536. Background technique [0002] The auxiliary power supply is the power supply of the control circuit and the drive circuit. Its function is to provide a stable low-voltage regulated power supply for the control circuit and the drive circuit. It is required to be able to output 12V, 24V regulated direct current. The auxiliary power supply generally adopts the form of switching power supply to ensure efficiency and reliability. Its composition forms usually include formal, flyback, push-pull, full-bridge, half-bridge, etc. In the prior art, the input voltage of the external power supply of the auxiliary power supply circuit can reach 80V to 800V, and the opening and closing of the auxiliary power supply is controlled through the weak current terminal. Even if the output of the auxiliar...

AI Technical Summary

Problems solved by technology

In the prior art, the input voltage of the external power supply of the auxiliary power supply circuit can reach 80V to 800V, and the opening and closing of the auxiliary power supply are controlled through the weak current terminal. Even if the output of the auxiliary power supply is turned off, the electric energy input by the external power supply still needs to be consumed

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