Patent ID: 8493016

Claim:
A semiconductor circuit device, comprising: a semiconductor circuit including a switching element; a component temperature monitoring unit detecting or estimating a temperature of a component connected to an inside or an outside of said semiconductor circuit, the temperature of said component changing in accordance with a frequency of a current flowing through said component, the frequency of the current flowing through said component changing in accordance with a switching frequency of said switching element; a detection unit detecting an output voltage or an output current of the semiconductor circuit; and a control unit controlling a gate control signal driving said switching element by determining the switching frequency of the switching element such that the temperature of said component is equal to a first target temperature, wherein when the detection unit detects an output voltage of the semiconductor circuit, the control unit controls the gate control signal driving the switching element by determining a duty ratio of the switching element such that the detected output voltage of the semiconductor circuit is equal to a target voltage, and when the detection unit detects an output current of the semiconductor circuit, the control unit controls the gate control signal driving the switching element by determining a modulation wave amplitude of the semiconductor circuit such that the detected output current of the semiconductor circuit is equal to a target current.