Patent ID: 7462082

Claim:
A control device for a power trim unit for an outboard engine for controlling a power trim unit for an outboard engine that uses a power trim motor as a drive source to change a trim angle of the outboard engine, comprising: an H bridge circuit in which an upper side and a lower side of a bridge are comprised of upper semiconductor switches and lower semiconductor switches that are turned on when receiving drive signals, a DC voltage from a DC power supply is applied between a common connection point of said upper semiconductor switches and a common connection point of said lower semiconductor switches, and a connection point between each upper semiconductor switch and each lower semiconductor switch is connected to an input terminal of said power trim motor; an ignition switch that is turned on when said outboard engine is operated; a trim angle sensor that detects a trim angle of said outboard engine; trim angle control means for performing control to cause said trim angle to reach a target value by controlling provision of the drive signals to the semiconductor switches of said H bridge circuit so as to perform PWM control of a driving current supplied from said DC power supply through said H bridge circuit to said power trim motor according to a deviation between the target value of said trim angle set according to an operation state and a trim angle detected by said trim angle sensor; and overcurrent protection means for interrupting overcurrent when the overcurrent flows from said DC power supply through said H bridge circuit.