| 摘要 |
PURPOSE: A current sensing circuit of an engine control unit is provided to prevent the damage of a switching element by turning off the switching element when detecting an overvoltage. CONSTITUTION: In a current sensing circuit of an engine control unit, a voltage is measured through shunt resistance(12). An operational amplifier(11) amplifies the measured voltage. A comparator compares the amplified voltage with a reference voltage. A NAND gate(13) receives an output signal of a comparator with an output signal of MCU. The NAND gate turns on/off the switching elements. |
