Control circuit of galvanometer motor and LiDAR

1 . A control circuit of a galvanometer motor, configured to control the galvanometer motor to be discharged during a power failure, wherein the control circuit comprises:

a switch circuit, configured to access a control voltage; and

a discharge circuit, connected to the switch circuit and configured to be connected to a driving positive electrode and a driving negative electrode of the galvanometer motor,

wherein during the power failure, the switch circuit controls the discharge circuit to be short-circuited based on the control voltage, to release a reverse induction electromotive force between the driving positive electrode and the driving negative electrode of the galvanometer motor that is generated due to the power failure;

wherein the switch circuit comprises:

a voltage divider circuit comprising at least two voltage divider resistors, wherein the voltage divider circuit comprises a terminal configured to access the control voltage, and the other terminal that is grounded, and there is a voltage divider node between any two of the voltage divider resistors; and

a first switch transistor having a first input terminal, a first output terminal, and a first controlled terminal, wherein the first input terminal is configured to access a first control voltage, the first output terminal is connected to the discharge circuit, and the first controlled terminal is connected to the voltage divider node;

wherein the discharge circuit comprises a second switch transistor, a third switch transistor, and a bias resistor;

wherein the second switch transistor comprises a second input terminal, a second output terminal, and a second controlled terminal;

wherein the third switch transistor comprises a third input terminal, a third output terminal, and a third controlled terminal;

wherein the second controlled terminal and the third controlled terminal are jointly connected to the first output terminal and a first terminal of the bias resistor;

wherein the second output terminal and the third output terminal are jointly connected to a second terminal of the bias resistor; and

wherein the second input terminal is connected to the driving positive electrode, and the third input terminal is connected to the driving negative electrode.

2 . The control circuit according to claim 1 , wherein the voltage divider circuit comprises a first voltage divider resistor and a second voltage divider resistor connected in series, and

wherein a first terminal of the first voltage divider resistor is configured to access the first control voltage, a second terminal of the first voltage divider resistor is connected to a first terminal of the second voltage divider resistor and the voltage divider node, and a second terminal of the second voltage divider resistor is grounded.

3 . The control circuit according to claim 1 , wherein the discharge circuit further comprises:

a diode, wherein an anode of the diode is connected to a second terminal of the bias resistor, and a cathode of the diode is grounded.

4 . The control circuit according to claim 2 , wherein for the same type of traffic participant, the higher the hazard level corresponding to the travel direction of the vehicle, the greater the width of the first warning region; and

wherein for the same type of travel direction, the higher the hazard level corresponding to the type of the traffic participant, the greater the width of the first warning region.

5 . The control circuit according to claim 2 , wherein the discharge circuit further comprises:

a first discharge resistor, wherein the second input terminal is connected to the driving positive electrode through the first discharge resistor; and

a second discharge resistor, wherein the third input terminal is connected to the driving negative electrode through the second discharge resistor.

6 . The control circuit according to claim 1 , wherein the first switch transistor is a PMOS transistor, and the second switch transistor and the third switch transistor are both NMOS transistors.

7 . The control circuit according to claim 6 , further comprising:

a voltage source, connected to the switch circuit and configured to: output a high-level control voltage to the switch circuit during the power failure of the galvanometer motor, and output a low-level control voltage to the switch circuit when the galvanometer motor is powered on.

8 . A LiDAR, comprising:

a galvanometer, configured to change an outgoing direction of a laser beam;

a galvanometer motor, drivingly connected to the galvanometer and having a driving positive electrode and a driving negative electrode; and

a control circuit of the galvanometer motor, comprising:

a switch circuit, configured to access a control voltage; and

a discharge circuit, connected to the switch circuit and configured to be connected to the driving positive electrode and the driving negative electrode of the galvanometer motor,

wherein during a power failure, the switch circuit controls the discharge circuit to be short-circuited based on the control voltage, to release a reverse induction electromotive force between the driving positive electrode and the driving negative electrode of the galvanometer motor that is generated due to the power failure;

wherein the switch circuit comprises:

a voltage divider circuit comprising at least two voltage divider resistors, wherein the voltage divider circuit comprises a terminal configured to access the control voltage, and the other terminal that is grounded, and there is a voltage divider node between any two of the voltage divider resistors; and

a first switch transistor having a first input terminal, a first output terminal, and a first controlled terminal, wherein the first input terminal is configured to access a first control voltage, the first output terminal is connected to the discharge circuit, and the first controlled terminal is connected to the voltage divider node;

wherein the discharge circuit comprises a second switch transistor, a third switch transistor, and a bias resistor;

wherein the second switch transistor comprises a second input terminal, a second output terminal, and a second controlled terminal;

wherein the third switch transistor comprises a third input terminal, a third output terminal, and a third controlled terminal;

wherein the second controlled terminal and the third controlled terminal are jointly connected to the first output terminal and a first terminal of the bias resistor;

wherein the second output terminal and the third output terminal are jointly connected to a second terminal of the bias resistor; and

wherein the second input terminal is connected to the driving positive electrode, and the third input terminal is connected to the driving negative electrode.