| 摘要 |
PROBLEM TO BE SOLVED: To provide an energization circuit protection device, capable of intercepting a conduction circuit by securely detecting heating in a circuit for controlling to drive a load by PWM driving a semiconductor switch.SOLUTION: When driving a load RL by PWM driving a semiconductor device 11 disposed in a circuit for connecting the load RL to a power supply VB, if a current flowing through the load RL exceeds a threshold temperature, the semiconductor device 11 is switched from PWM drive to DC drive. Thus, in the event of an overcurrent, an estimated temperature by temperature estimation means exceeds the threshold temperature and the semiconductor device 11 is intercepted, so that the energization circuit can surely be protected. |
