REVERSE CURRENT BLOCKAGE THROUGH BUCK CONTROLLER BLOCK

摘要

A switching circuit with reverse current prevention for use in a Buck converter includes a power switch coupled to a coupling node, which is an interconnection point of a power switch, an inductor and a freewheeling diode of the Buck converter. The inductor is coupled between the coupling node and an output of the Buck converter, and the freewheeling diode is coupled between coupling node and an output return of the Buck converter. A controller is coupled to receive a feedback signal to control switching of the power switch to regulate a transfer of energy from the input to the output of the Buck converter. A reverse current prevention circuit is coupled to detect a reverse current condition of the power switch to generate an inhibit signal to inhibit the power switch from receiving a drive signal to prevent a reverse current through the power switch.

主权项

1. A switching circuit with reverse current prevention for use in a Buck converter, comprising:
a power switch coupled between an input of the Buck converter and a coupling node of the Buck converter, wherein the input of the Buck converter is coupled to a rectified sinusoidal ac voltage, wherein the coupling node is an interconnection point of the power switch, an inductor and a freewheeling diode, wherein the inductor is coupled between the coupling node and an output of the Buck converter, and wherein the freewheeling diode is coupled between coupling node and an output return of the Buck converter; a controller coupled to receive a feedback signal representative of the output of the Buck converter, wherein the controller is coupled to generate a drive signal coupled to control switching of the power switch to regulate a transfer of energy from the input of the Buck converter through the inductor to the output of the Buck converter; and a reverse current prevention circuit included in the controller and coupled to detect a reverse current condition of the power switch in response to the power switch, wherein the reverse current prevention circuit is coupled to generate an inhibit signal in response to the reverse current condition, wherein the power switch is coupled to be inhibited from receiving the drive signal in response to the inhibit signal to inhibit a reverse current through the power switch.