Switch protection device
View Patent ↗The present disclosure provides a protective device related to the field of battery technology. The protective device includes an electronic switch, a mechanical switch and a time logic circuit. A first output terminal of the time logic circuit is connected to the electronic switch; a second output terminal of the time logic circuit is connected to the mechanical switch; an input terminal of the time logic circuit is connected to an output terminal of a power supply; and the electronic switch is connected in series with the mechanical switch into a circuit under control. The protective device provided in the present disclosure can effectively reduce the damage of the mechanical switch and extend the service life of the mechanical switch.
1. A protective device, comprising an electronic switch, a mechanical switch and a time logic circuit, wherein:
a first output terminal of the time logic circuit is connected to the electronic switch;
a second output terminal of the time logic circuit is connected to the mechanical switch;
an input terminal of the time logic circuit is connected to an output terminal of a power supply; and
the electronic switch is connected in series with the mechanical switch into a circuit under control,
wherein the time logic circuit comprises a first drive circuit and a second drive circuit;
the first drive circuit comprises a first resistor, a second resistor, a first capacitor, a first diode and a flyback circuit, wherein:
an end of the first resistor is connected to the output terminal of the power supply, and the other end of the first resistor is connected to an input terminal of the flyback circuit;
an end of the first diode is connected to the output terminal of the power supply, and the other end of the first diode is connected to the input terminal of the flyback circuit;
an end of the first capacitor is connected to the input terminal of the flyback circuit, and the other end of the first capacitor is grounded; and
an end of the second resistor is connected to the input terminal of the flyback circuit, and the other end of the second resistor is grounded;
the second drive circuit comprises a second capacitor and a second diode, wherein:
an end of the second diode is connected to the output terminal of the power supply, and the other end of the second diode is connected to the mechanical switch and an end of the second capacitor; and
the end of the second capacitor is connected to the second diode and the mechanical switch, and the other end of the second capacitor is grounded.
2. The device of claim 1 , wherein a charging time of the first capacitor is longer than a charging time of the second capacitor.
3. The device of claim 1 , wherein the electronic switch comprises a thyristor, a transistor, or an integrated gate commutated thyristor.
4. The device of claim 1 , wherein the mechanical switch comprises a relay or a contactor.
5. The device of claim 1 , wherein the connection between the first output terminal of the time logic circuit and the electronic switch and the connection between the second output terminal of the time logic circuit and the mechanical switch are implemented via a communication bus.
6. The device of claim 5 , wherein the communication bus comprises a Controller Area Network (CAN), a Local Interconnect Network (LIN), and an Ethernet.