Protection circuit of earphone charging box and earphone charging box

Abstract

The present invention discloses a protection circuit of an earphone charging box and an earphone charging box, and relates to the field of earphone technology. The protection circuit includes: a DC conversion circuit module, a battery module, a sampling circuit module and an overcurrent protection module; the input end of the DC conversion circuit module is connected to the output end of the battery module; the output end of the sampling circuit module is connected to the overcurrent protection module, and is used to output a corresponding overcurrent voltage signal to the overcurrent protection module when an overcurrent is detected in the load of the earphone charging box; the overcurrent protection module is connected to the enable end of the DC conversion circuit module, and is used to output a shutdown signal to the enable end of the DC conversion circuit module according to the overcurrent voltage signal to shut down the DC conversion circuit module. It can be seen that the present invention shuts down the output of the DC conversion circuit module when the load of the earphone charging box is overcurrent or short-circuited, which solves the problem that the existing Bluetooth earphone charging box uses a protection chip or a single-chip microcomputer to implement overcurrent protection, resulting in high overcurrent protection cost.

Images