Patent ID: 9042069
Filing Date: 2015-05-26
Classification: H02H,H02M,H03K

Abstract:
1. A power supply controller comprising: a switch element connected to a power supply path between a power source and a load; a current detection element configured to output a detection signal corresponding to a value of a flowing current flowing through the power supply path; a power-supply-path protection unit configured to perform a power-supply-path protection operation which restricts power supply by use of the switch element on condition that a value of temperature increase of the power supply path with respect to a reference temperature exceeds a temperature threshold value; and a switch protection unit configured to perform a switch protection operation which restricts the power supply by use of the switch element on condition that a value of the flowing current based on the detection signal exceeds a current threshold value and removes the restriction of the power supply by use of the switch element based on the value of the flowing current after a reference time, wherein the power-supply-path protection unit (i) has a first operation state in which it adds an additional value to the value of temperature increase and compares a post-addition temperature to the temperature threshold value, if the value of the flowing current exceeds the current threshold value, and (ii) has a second operation state in which it compares the value of the temperature increase to the temperature threshold value without adding the additional value, if the value of the flowing current does not exceed the current threshold value.