The comparator reference terminal is receiving a reference voltage. The comparator input terminal is connected to a power source via a first resistor and is also connected to the electrical device to receive a working current draw of the electrical device. The comparator has a comparator input terminal, a comparator reference terminal, and a comparator output terminal. In response to the receipt of an emergency stop signal, the PWM signal transmission circuit stops transmitting the PWM signals, and the drive circuit stops outputting the inverter drive signals.Ībstract: A fan control circuit for controlling a fan to dissipate heat from an electrical device includes a comparator and an electrical switch.
The other emergency stop signal is inputted to the N-side drive circuit and the PWM signal transmission circuit.
One of the emergency stop signals is inputted to the P-side drive circuit and the PWM signal transmission circuit. The drive circuit includes a P-side drive circuit for driving the P-side power switching device, and an N-side drive circuit for driving the N-side power switching device. The inverter circuit includes a P-side power switching device and an N-side power switching device. The drive circuit generates inverter drive signals. The PWM signal transmission circuit transmits the PWM signals. Abstract: A motor control device, which receives at least two emergency stop signals, includes an LSI, a PWM signal transmission circuit, a drive circuit, and an inverter circuit.
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