Short circuit protection device, flyback power supply and inverter

Abstract

The invention discloses a short-circuit protection device, a flyback power supply and an inverter. The short-circuit protection device comprises a control module, a short-circuit protection module, a transformer and a primary side driving module connected with a primary side winding of the transformer, the output end and the primary sampling end of the control module are connected with the primary driving module; the feedback end of the control module is connected with a secondary winding of the transformer and the short-circuit protection module; the short-circuit protection module is used for lowering the voltage of the feedback end to a preset low level when detecting that the secondary winding is short-circuited; and the control module is used for blocking the PWM signal output to the primary side driving module under the condition that the voltage of the primary side sampling end is detected to be greater than the voltage of the feedback end. According to the invention, the technical problem of circuit damage caused by short circuit of the secondary winding is solved.

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