Motor protecting circuit

A motor protecting circuit, which is applicable to a motor, the motor protecting circuit comprising:

• a rotor position detector circuit disposed on the motor and configured to detect and output a rotor position of the motor;
• an output circuit including a plurality of high-side transistors and a plurality of low-side transistors that are respectively classified in a plurality of groups, wherein one of the high-side transistors and one of the low-side transistors are classified in each of the groups, a first terminal of the high-side transistor in each of the groups is coupled to a power supply voltage, a second terminal of the low-side transistor in each of the groups is grounded, a second terminal of the high-side transistor is connected to a first terminal of the low-side transistor in each of the groups, and a node between the second terminal of the high-side transistor and the first terminal of the low-side transistor in each of the groups is connected to a same terminal of the motor;
• a driver circuit connected to the output circuit, a control terminal of each of the high-side transistors, and a control terminal of each of the low-side transistors, wherein the driver circuit is configured to drive the output circuit;
• a controller circuit connected to the driver circuit and the rotor position detector circuit, and configured to control the driver circuit according to the rotor position of the motor that is detected by the rotor position detector circuit;
• and
• an overvoltage detector circuit connected to the controller circuit and coupled to the power supply voltage of the output circuit, wherein, when the overvoltage detector circuit determines that the power supply voltage of the output circuit is higher than a voltage threshold, the overvoltage detector circuit outputs an overvoltage detected signal to the controller circuit;
• wherein, according to the overvoltage detected signal, the controller circuit controls the driver circuit to turn on the high-side transistor and the low-side transistor in one of the plurality of groups at the same time, or to turn on the high-side transistors and the low-side transistors in some or all of the plurality of groups at the same time.