Patent ID: 8217608
Filing Date: 2012-07-10
Classification: H02P,Y10S

Abstract:
1. An electric power supply device for switching supply and stop of electric power to a motor load by performing an on-off operation of an electronic switch which is disposed in a wiring path for connecting a power source to the motor load, the electric power supply device comprising: a current detection section that detects a current flowing in the motor load; and a switch control section that performs control in which an operation of turning off the electronic switch for only a second predetermined time after turning on the electronic switch for only a first predetermined time for which lock torque can be caused is repeatedly executed when the current detection section detects a lock current flowing at the time when the motor load locks, and the electronic switch is returned to a normal operation when the current detection section detects a current smaller than the lock current, wherein the current detection section has a comparison section for comparing a variable determination voltage A with a voltage (Vds) between both ends of the electronic switch; wherein the switch control section sets a standard determination voltage (v