Single coil magnetic latching relay control circuit and method

Patent metadata

Field	Value
Publication number	US-10964501-B2
Application number	US-201616306471-A
Country	US
Kind code	B2
Filing date	Aug 15, 2016
Priority date	Jun 1, 2016
Publication date	Mar 30, 2021
Grant date	Mar 30, 2021

Abstract

A control circuit and method for a single coil magnetic latching relay is provided in the present disclosure. The circuit includes: a first control circuit (21) and a first single coil magnetic latching relay coil (22). The first control circuit (21) includes: a first transistor (211), a first diode (212), a second diode (213), a first capacitor (214), a second capacitor (215), a first resistor (216) and a second resistor (217) and the first control circuit (21) is configured to control the first single coil magnetic latching relay coil (22) to enter a preset state and/or maintain the preset state.

First claim

What is claimed is:

1. A control circuit for a single coil magnetic latching relay, comprising: a first control circuit and a first single coil magnetic latching relay coil;
wherein the first control circuit comprises: a first transistor, a first diode, a second diode, a first capacitor, a second capacitor, a first resistor and a second resistor;
a collector electrode of the first transistor is connected to an anode of the first diode and a first terminal of the second capacitor; an emitter electrode of the first transistor is connected to an anode of the second diode, a first terminal of the first capacitor and one end of the first single coil magnetic latching relay coil; and a base electrode of the first transistor is connected to a cathode of the second diode and a first terminal of the second resistor;
a cathode of the first diode is connected to a first terminal of the first resistor, and a second terminal of the first resistor is connected to a second terminal of the first capacitor and a second terminal of the second resistor;
a second terminal of the second capacitor is connected to an other end of the first single coil magnetic latching relay coil; and
the first control circuit is configured to control the first single coil magnetic latching relay coil to enter a preset state and/or maintain the preset state.

2. The control circuit for a single coil magnetic latching relay according to claim 1 , wherein
the anode of the first diode is further connected to a high-level input voltage; and
the cathode of the second diode is further connected to a low-level input voltage.

3. The control circuit for a single coil magnetic latching relay according to claim 1 , wherein the first control circuit further comprises a first drive circuit, wherein a high-level input end of the first drive circuit is connected to the anode of the first diode and a low-level input end of the first drive circuit is connected to the cathode of the second diode, and the first drive circuit is configured to provide a drive voltage for the first single coil magnetic latching relay coil.

4. The control circuit for a single coil magnetic latching relay according to claim 3 , wherein the first drive circuit comprises a first power supply and a first control element, wherein a positive electrode of the first power supply is connected to the anode of the first diode, a negative electrode of the first power supply is connected to the first control element, the first control element is connected to the cathode of the second diode, the first power supply is configured to provide the drive voltage for the first single coil magnetic latching relay coil and the first control element is configured to control the first power supply to be turned on or off.

5. The control circuit for a single coil magnetic latching relay according to claim 1 , wherein the first transistor comprises an NPN transistor.

6. A control circuit for a single coil magnetic latching relay, comprising: a second control circuit and a second single coil magnetic latching relay coil;
wherein the second control circuit comprises: a second transistor, a third diode, a fourth diode, a third capacitor, a fourth capacitor, a third resistor and a fourth resistor;
an emitter electrode of the second transistor is connected to a first terminal of the third capacitor, a cathode of the fourth diode and a first terminal of the fourth capacitor; a collector electrode of the second transistor is connected to a first terminal of the third resistor and one end of the second single coil magnetic latching relay coil; and a base electrode of the second transistor is connected to an anode of the fourth diode and a first terminal of the fourth resistor;
a second terminal of the fourth resistor is connected to a second terminal of the third capacitor and an anode of the third diode; and a cathode of the third diode is connected to a second terminal of the third resistor;
a second terminal of the fourth capacitor is connected to an other end of the second single coil magnetic latching relay coil; and
the second control circuit is configured to control the second single coil magnetic latching relay coil to enter a preset state and/or maintain the preset state.

7. The control circuit for a single coil magnetic latching relay according to claim 6 , wherein
the anode of the fourth diode is further connected to a high-level input voltage;
and
the collector electrode of the second transistor is further connected to a low-level input voltage.

8. The control circuit for a single coil magnetic latching relay according to claim 6 , wherein the second control circuit further comprises a second drive circuit, wherein a high-level input end of the second drive circuit is connected to the anode of the fourth diode and a low-level input end of the second drive circuit is connected to the collector electrode of the second transistor, and the second drive circuit is configured to provide a drive voltage for the second single coil magnetic latching relay coil.

9. The control circuit for a single coil magnetic latching relay according to claim 8 , wherein the second drive circuit comprises a second power supply and a second control element, wherein a positive electrode of the second power supply is connected to the second control element, a negative electrode of the second power supply is connected to the collector electrode of the second transistor, the second control element is connected to the anode of the fourth diode, the second power supply is configured to provide the drive voltage for the second single coil magnetic latching relay coil and the second control element is configured to control the second power supply to be turned on or off.

10. The control circuit for a single coil magnetic latching relay according to claim 6 , wherein the second transistor comprises a PNP transistor.

11. A control method for a single coil magnetic latching relay, comprising:
controlling, by a first control circuit, a first single coil magnetic latching relay coil to enter a preset state and/or maintain the preset state;
wherein the first control circuit comprises: a first transistor, a first diode, a second diode, a first capacitor, a second capacitor, a first resistor and a second resistor; a collector electrode of the first transistor is connected to an anode of the first diode and a first terminal of the second capacitor; an emitter electrode of the first transistor is connected to an anode of the second diode, a first terminal of the first capacitor and one end of the first single coil magnetic latching relay coil; a base electrode of the first transistor is connected to a cathode of the second diode and a first terminal of the second resistor; a cathode of the first diode is connected to a first terminal of the first resistor; a second terminal of the first resistor is connected to a second terminal of the first capacitor and a second terminal of the second resistor; and a second terminal of the second capacitor is connected to an other end of the first single coil magnetic latching relay coil.

12. The control method for a single coil magnetic latching relay according to claim 11 , wherein the preset state comprises a set state and/or a reset state.

13. The control method for a single coil magnetic latching relay according to claim 12 , wherein the controlling, by the first control circuit, the first single coil magnetic latching relay coil to enter the preset state comprises:
inputting a high-level drive voltage to the anode of the first diode; and
controlling, by a loop consisting of the second capacitor, the first single coil magnetic latching relay coil and the

Assignees

• Zte Corp

Inventors

• Tang Rongdao
• Huang Jian
• Qiu Wei

Classifications

• H01H47/226 Primary

  for bistable relays · CPC title

• H01H47/325

  by switching regulator · CPC title

• H01H47/32

  Energising current supplied by semiconductor device · CPC title

• H01H50/32 Primary

  Latching movable parts mechanically · CPC title

• H01H50/443

  Connections to coils · CPC title