A drive circuit of a relay, a relay, and an electronic device

Abstract

The application discloses a relay driving circuit, a relay and an electronic device, which comprise a first switch module, a second switch module, a first capacitor module and a second capacitor module. The first switch module is used for being turned on in response to a control voltage and controlling the second switch module to be turned on. The second switch module is used for transmitting a reference voltage to the first capacitor module, so as to charge the first capacitor module. The first capacitor module is used for sequentially outputting the reference voltage and a first voltage to the second capacitor module in the charging process. The second capacitor module is used for outputting double reference voltage to one end of a coil of a relay in response to the reference voltage, and outputting a second voltage to the one end of the coil of the relay in response to the first voltage. The second voltage is smaller than the double reference voltage, so that the contact attraction of the relay can be controlled and maintained by using a normal voltage level, and then a PWM signal provided by a controller is not needed to maintain the contact attraction of the relay, and then the driving cost of the relay can be reduced.

Description

Technical Field

[0001] This application relates to the field of power electronics technology, specifically to a relay drive circuit, a relay, and an electronic device. Background Technology

[0002] In the field of photovoltaic grid-connected technology, the direct current (DC) output from photovoltaic modules can be converted into alternating current (AC) that can be connected to the AC power grid via an inverter. Furthermore, a relay is installed between the inverter and the AC power grid. When the relay contacts are closed, the AC output from the inverter can be connected to the AC power grid; when the relay contacts are open, the AC output from the inverter cannot be connected to the AC power grid. However, the current high cost of driving relays hinders their widespread application in the photovoltaic grid-connected technology field. Utility Model Content

[0003] This application discloses a relay driving circuit, a relay, and an electronic device to solve the problem of high relay driving cost.

[0004] In a first aspect, this application discloses a relay driving circuit, including a first switch module, a second switch module, a first capacitor module, and a second capacitor module; the control terminal of the first switch module is used to receive a control voltage; a first terminal of the first switch module is grounded; a second terminal of the first switch module is connected to the control terminal of the second switch module; the first switch module is used to control the second switch module to conduct in response to the control voltage; a first terminal of the second switch module is used to receive a reference voltage; a second terminal of the second switch module is connected to the first terminal of the first capacitor module; the second switch module is used to transmit the reference voltage to the first capacitor module, so as to use the reference voltage to control the first capacitor module. The first capacitor module is used for charging; the second terminal of the first capacitor module is connected to the first terminal of the second capacitor module; the first capacitor module is used to sequentially output the reference voltage and the first voltage to the second capacitor module during the charging process, wherein the first voltage is less than the reference voltage; the second terminal of the second capacitor module is used to receive the reference voltage; the third terminal of the second capacitor module is grounded; the fourth terminal of the second capacitor module is used to connect to one end of the coil of the relay; the second capacitor module is used to output twice the reference voltage to one end of the coil of the relay in response to the reference voltage, and to output a second voltage to one end of the coil of the relay in response to the first voltage, wherein the second voltage is less than twice the reference voltage.

[0005] In some embodiments of this application, the first capacitor module includes a first capacitor and a first resistor; the first capacitor and the first resistor are connected in parallel; one end of the first capacitor is the first terminal of the first capacitor module; and the other end of the first capacitor is the second terminal of the first capacitor module.

[0006] In some embodiments of this application, the second capacitor module includes a first diode, a second capacitor, a second resistor, and a third resistor; the positive terminal of the first diode is the second terminal of the second capacitor module, and the negative terminal of the first diode is connected to one end of the second resistor; the other end of the second resistor is connected to one end of the second capacitor, and the other end of the second capacitor is connected to one end of the third resistor; the other end of the third resistor is the third terminal of the second capacitor module, the other end of the second resistor is the fourth terminal of the second capacitor module, and one end of the third resistor is the first terminal of the second capacitor module.

[0007] In some embodiments of this application, the first voltage is determined by the reference voltage, the resistance value of the first resistor, and the resistance value of the third resistor, and the second voltage is determined by the reference voltage, the voltage of the first diode, the resistance value of the second resistor, and the resistance value of the relay coil.

[0008] In some embodiments of this application, the first capacitor and the second capacitor include electrolytic capacitors; the capacitance values ​​of the first capacitor and the second capacitor are equal; and the resistance values ​​of the first resistor and the third resistor are equal.

[0009] In some embodiments of this application, the second end of the first switch module is further used to connect to the other end of the coil of the relay, and the first switch module is further used to ground the other end of the coil of the relay.

[0010] In some embodiments of this application, the first switching module includes a fourth resistor, a fifth resistor, a third capacitor, a first switching transistor, and a transient diode; one end of the fourth resistor, the fifth resistor, and the third capacitor are all connected to the control terminal of the first switching transistor, the other end of the fourth resistor and the third capacitor are connected to the first terminal of the first switching transistor, and the other end of the fifth resistor is the control terminal of the first switching module; one end of the transient diode is connected to the second terminal of the first switching transistor, and the other end of the transient diode is connected to the first terminal of the first switching transistor; the first terminal of the first switching transistor is the first terminal of the first switching module, and the second terminal of the first switching transistor is the second terminal of the first switching module.

[0011] In some embodiments of this application, the second switching module includes a sixth resistor, a seventh resistor, and a second switching transistor; one end of the sixth resistor is the control terminal of the second switching module, and the other end of the sixth resistor is connected to the control terminal of the second switching transistor; one end of the seventh resistor is connected to the control terminal of the second switching transistor, and the other end of the seventh resistor is connected to the first terminal of the second switching transistor; the first terminal of the second switching transistor is the first terminal of the second switching module, and the second terminal of the second switching transistor is the second terminal of the second switching module.

[0012] Secondly, this application discloses a relay, including an electromagnet, a spring, an armature, contacts, and a driving circuit for the relay as described in any of the preceding claims. The driving circuit is connected to the coil of the electromagnet and is used to output a voltage to the coil to drive the electromagnet to attract the armature, thereby causing the armature to drive the contacts to attract.

[0013] Thirdly, this application discloses an electronic device including the relay described above.

[0014] This application discloses a relay driving circuit, a relay, and an electronic device. The driving circuit includes a first switching module, a second switching module, a first capacitor module, and a second capacitor module. The first switching module is used to control the second switching module to turn on in response to a control voltage. The second switching module is used to transmit a reference voltage to the first capacitor module to charge the first capacitor module using the reference voltage. During the charging process, the first capacitor module sequentially outputs a reference voltage and a first voltage to the second capacitor module, where the first voltage is less than the reference voltage. In response to the reference voltage, the second capacitor module outputs twice the reference voltage to one end of the relay coil and, in response to the first voltage, outputs a second voltage to one end of the relay coil, where the second voltage is less than twice the reference voltage. Therefore, twice the reference voltage can be used as the pull-in voltage to control the relay contacts to close, and the second voltage can be used as the holding voltage to maintain the relay contacts to close. Thus, a constant level voltage can be used to control and maintain the relay contacts to close, eliminating the need for a controller to provide a PWM signal to maintain the relay contacts to close, thereby reducing the relay driving cost. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application or the background art, the accompanying drawings used in the embodiments of this application or the background art will be described below.

[0016] Figure 1 This is a schematic diagram of an existing relay structure.

[0017] Figure 2 This is a schematic diagram of a conventional relay drive circuit structure.

[0018] Figure 3 This is a schematic diagram of another existing relay drive circuit structure.

[0019] Figure 4 This is a schematic diagram of the structure of a relay driving circuit disclosed in an embodiment of this application.

[0020] Figure 5 This is a schematic diagram of the structure of another relay driving circuit disclosed in an embodiment of this application.

[0021] Figure 6 This is a circuit diagram of a relay driving circuit disclosed in an embodiment of this application. Detailed Implementation

[0022] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0023] like Figure 1 As shown, Figure 1 This is a schematic diagram of a conventional relay, which includes an electromagnet, a spring, an armature, and contacts. When the electromagnet's coil is energized, the electromagnet generates a magnetic force that attracts the armature, causing it to move and close the contacts. When the electromagnet's coil is de-energized, the magnetic force disappears, the spring returns the armature to its initial position, and the contacts open. Because the distance between the armature and the electromagnet changes during the attraction of the armature, the current applied to the coil can gradually decrease as the distance decreases while maintaining a constant force. This means that the electromagnet coil requires a higher voltage level to control the contact closure and a lower voltage level to maintain the contact closure.

[0024] like Figure 2 As shown, Figure 2The diagram shows a schematic of a conventional relay drive circuit. This circuit includes a controller and a switching transistor K. The controller is connected to the control terminal of the switching transistor K. One end of the switching transistor K receives a reference voltage Vdd, and the other end is connected to the relay coil. During relay driving, the controller first inputs a constant-level voltage to the control terminal of the switching transistor K to turn it on, transmitting the reference voltage Vdd to the relay coil to close the relay contacts. Then, it inputs a PWM signal to the control terminal of the switching transistor K to periodically turn it on or off, thereby maintaining the relay contacts closed. However, this requires the controller's drive resources to obtain the PWM signal, which is detrimental to reducing the cost of relay driving.

[0025] like Figure 3 As shown, Figure 3 The diagram illustrates another existing relay drive circuit structure. This drive circuit includes a first switch K1 and a second switch K2. The first switch K1 receives a reference voltage Vdd and its other end is connected to the relay coil. One end of the second switch K2 is connected to the control terminal of the first switch K1, and the other end is grounded. During relay operation, a high-level input to the control terminal of the second switch K2 turns it on, which in turn turns on the first switch K1, transmitting a high voltage VGH to the relay coil and causing the relay contacts to close. A low-level input to the control terminal of the second switch K2 turns it off, which in turn turns off the first switch K1, transmitting a low voltage VGL to the relay coil and maintaining the relay contacts closed. While it is possible to use a constant-level voltage to drive the relay contacts, this requires an additional step-down circuit to provide the high voltage VGH and the low voltage VGL, increasing the complexity and cost of the relay drive circuit.

[0026] Based on this, this application discloses a relay driving circuit, which realizes the relay driving through devices such as switching transistors, capacitors and resistors, which helps to reduce the cost of the relay driving circuit.

[0027] As an optional implementation of the disclosure in this application, an embodiment of this application discloses a relay driving circuit, such as... Figure 4 As shown, Figure 4 This is a schematic diagram of the structure of a relay driving circuit disclosed in an embodiment of this application, including a first switch module 10, a second switch module 20, a first capacitor module 30, and a second capacitor module 40.

[0028] The control terminal of the first switch module 10 is used to receive the control voltage V. DRVThe first terminal of the first switch module 10 is grounded, and the second terminal of the first switch module 10 is connected to the control terminal of the second switch module 20. The first switch module 10 is used to respond to the control voltage V. DRV It turns on and controls the second switch module 20 to turn on.

[0029] The first terminal of the second switching module 20 is used to receive the reference voltage V. CC The second terminal of the second switch module 20 is connected to the first terminal of the first capacitor module 30. The second switch module 20 is used to switch the reference voltage V. CC Transmitted to the first capacitor module 30 to utilize the reference voltage V CC The first capacitor module 30 is charged.

[0030] The second terminal of the first capacitor module 30 is connected to the first terminal of the second capacitor module 40. The first capacitor module 30 is used to sequentially output a reference voltage V during the charging process. CC The first voltage is applied to the second capacitor module 40, and the first voltage is less than the reference voltage V. CC .

[0031] The second terminal of the second capacitor module 40 is used to receive the reference voltage V. CC The third terminal of the second capacitor module 40 is grounded, and the fourth terminal of the second capacitor module 40 is used to connect to one end of the relay coil. The second capacitor module 40 is used in response to the reference voltage V. CC Output twice the reference voltage V CC A second voltage is output to one end of the relay coil in response to the first voltage. This second voltage is less than twice the reference voltage V. CC .

[0032] In this embodiment, twice the reference voltage V can be used. CC The relay contacts are controlled by a pull-in voltage, and a second voltage is used as a sustaining voltage to maintain the relay contacts. This allows the relay contacts to be controlled and maintained using a constant voltage level, eliminating the need for a PWM signal from the controller to maintain the relay contacts and thus reducing the relay drive cost.

[0033] In some embodiments of this application, such as Figure 5 As shown, Figure 5 This is a schematic diagram of another relay driving circuit disclosed in an embodiment of this application. The second end of the first switch module 10 is also used to connect to the other end of the relay coil, and the first switch module 10 is also used to ground the other end of the relay coil.

[0034] In some embodiments of this application, such as Figure 6 As shown, Figure 6This is a circuit diagram of a relay driving circuit disclosed in an embodiment of this application. The first capacitor module 30 includes a first capacitor C1 and a first resistor R1. The first capacitor C1 and the first resistor R1 are connected in parallel. One end of the first capacitor C1 is the first end of the first capacitor module 30, and the other end of the first capacitor C1 is the second end of the first capacitor module 30.

[0035] Based on this, in some embodiments of this application, such as Figure 6 As shown, the second capacitor module includes a first diode D1, a second capacitor C2, a second resistor R2, and a third resistor R3. The positive terminal of the first diode D1 is the second terminal of the second capacitor module 40. The negative terminal of the first diode D1 is connected to one end of the second resistor R2. The other end of the second resistor R2 is connected to one end of the second capacitor C2. The other end of the second capacitor C2 is connected to one end of the third resistor R3. The other end of the third resistor R3 is the third terminal of the second capacitor module 40. The other end of the second resistor R2 is the fourth terminal of the second capacitor module 40. One end of the third resistor R3 is the first terminal of the second capacitor module 40.

[0036] In some embodiments of this application, such as Figure 6 As shown, the first switching module includes a fourth resistor R4, a fifth resistor R5, a third capacitor C3, a first switching transistor Q1, and a transient diode TVS. One end of each of the fourth resistor R4, the fifth resistor R5, and the third capacitor C3 is connected to the control terminal of the first switching transistor Q1; the other end of each of the fourth resistor R4 and the third capacitor C3 is connected to the first terminal of the first switching transistor Q1; the other end of the fifth resistor R5 is the control terminal of the first switching module 10. One end of the transient diode TVS is connected to the second terminal of the first switching transistor Q1, and the other end of the transient diode TVS is also connected to the first terminal of the first switching transistor Q1. The first terminal of the first switching transistor Q1 is the first terminal of the first switching module 10, and the second terminal of the first switching transistor Q1 is the second terminal of the first switching module 10.

[0037] In some embodiments of this application, such as Figure 6 As shown, the second switching module includes a sixth resistor R6, a seventh resistor R7, and a second switching transistor Q2. One end of the sixth resistor R6 is the control terminal of the second switching module 20, and the other end of the sixth resistor R6 is connected to the control terminal of the second switching transistor Q2. One end of the seventh resistor R7 is connected to the control terminal of the second switching transistor Q2, and the other end of the seventh resistor R7 is connected to the first terminal of the second switching transistor Q2. The first terminal of the second switching transistor Q2 is the first terminal of the second switching module 20, and the second terminal of the second switching transistor Q2 is the second terminal of the second switching module 20.

[0038] like Figure 6 As shown, taking the first switching transistor Q1 as an N-type switching transistor as an example, the control voltage V DRVWhen the control terminal of the first switch Q1 receives a low level, the first switch Q1 and the second switch Q2 are turned off, and the reference voltage V is high. CC The second capacitor C2 is charged through the first diode D1 and the second resistor R2 until the voltage V at one end of the second capacitor C2, i.e., the fourth end of the second capacitor module 40, reaches a certain level. RLY+ Equal to reference voltage V CC .

[0039] When the control terminal of the first switch Q1 receives a high level, the first switch Q1 is turned on, and the reference voltage V... CC The signal is transmitted through the seventh resistor R7 to the control terminal of the second switch Q2, controlling the second switch Q2 to conduct, thus enabling the reference voltage V to... CC The voltage is transferred to one end of the first capacitor C1 and one end of the first resistor R1 to charge the first capacitor C1. Because the voltage across the first capacitor C1 does not change abruptly at the beginning of charging, the first resistor R1 will transfer the reference voltage V. CC The voltage is transferred to the other end of the second capacitor C2. Because the voltage across the second capacitor C2 does not change abruptly, the voltage V at one end of the second capacitor C2, i.e., the fourth end of the second capacitor module 40, is constant. RLY+ Raised to twice the reference voltage V CC Because after being fully charged, the voltage across the first capacitor C1, i.e., the first voltage, is less than the reference voltage V. CC Therefore, the voltage V at one end of the second capacitor C2, i.e., the fourth end of the second capacitor module 40, is increased. RLY+ This is the second voltage.

[0040] In other words, at the instant the first switch Q1 and the second switch Q2 are turned on, the first capacitor module 30 outputs a reference voltage V. CC This causes the second capacitor module 40 to output twice the reference voltage V. CC The coil of the relay is connected to control the relay contacts to close. This not only speeds up the contact closing speed but also reduces contact bounce under no-load or light-load conditions.

[0041] After the first switch Q1 and the second switch Q2 have been turned on for a period of time, the first capacitor module 30 is fully charged. The first capacitor module 30 outputs a small first voltage to the second capacitor module 40, which in turn outputs a small second voltage to the coil of the relay, maintaining the contact of the relay.

[0042] In some embodiments of this application, the first voltage V1 is determined by the reference voltage V. CC The resistance values ​​of the first resistor R1 and the third resistor R3 are used to determine V1. Specifically, V1 = V CC *R1 / (R1+R3). The second voltage V2 is determined by the reference voltage V.CC The voltage across the first diode D1, the resistance of the second resistor R2, and the resistance of the relay coil determine the voltage. Specifically, V2 = (V CC -Vd) *R RLY / (R2+R RLY ), where Vd is the voltage of the first diode D1, R RLY This is the resistance value of the relay coil. Based on this, a suitable value for the second resistor R2 can be selected according to the required pull-in voltage and holding voltage.

[0043] In some embodiments of this application, the first capacitor C1 and the second capacitor C2 are electrolytic capacitors. To ensure a sufficiently long contact time for the control relay, the capacitance of the second capacitor C2 needs to be sufficiently large; for example, the capacitance of the second capacitor C2 can be approximately 470uF. However, this application is not limited to this; the capacitance of the second capacitor C2 can be determined based on the specific parameters of the relay. It should be noted that because the second capacitor C2 is an electrolytic capacitor, the resistance value of the second resistor R2 must be selected to ensure that the terminals of the second capacitor C2 do not experience a negative voltage.

[0044] In some embodiments of this application, in order to ensure that the charging process of the first capacitor C1 and the discharging process of the second capacitor C2 are consistent, the capacitance values ​​of the first capacitor C1 and the second capacitor C2 are equal, and the resistance values ​​of the first resistor R1 and the third resistor R3 are equal, so as to ensure that the time constants of the charging circuit and the discharging circuit are consistent.

[0045] It should be noted that after the first switch Q1 and the second switch Q2 are turned off, the energy of the relay coil is discharged through the first diode D1, the second resistor R2, and the transient diode TVS. The larger reverse voltage generated by the transient diode TVS can accelerate the relay's turn-off speed. Furthermore, at the instant the first switch Q1 and the second switch Q2 are turned off, the reverse voltage generated in the coil is determined by the breakdown voltage of the transient diode TVS. That is, the magnitude of the transient diode TVS's breakdown voltage affects the speed of energy discharge from the coil; the larger the breakdown voltage of the transient diode TVS, the faster the discharge speed. The breakdown voltage of the transient diode TVS is generally chosen to be below 80V.

[0046] It should also be noted that the driving circuit disclosed in this application is simple, does not require additional power supplies of other voltage levels, uses fewer components, has a lower failure rate, occupies less board area, and has a lower cost.

[0047] As another optional implementation of the disclosure of this application, this application embodiment also discloses a relay, including an electromagnet, a spring, an armature, contacts, and a driving circuit of the relay as disclosed in any of the above embodiments. The driving circuit is connected to the coil of the electromagnet and is used to output voltage to the coil to drive the electromagnet to attract the armature, so that the armature drives the contacts to attract.

[0048] As another optional implementation of the disclosure in this application, embodiments of this application also disclose an electronic device, which includes a relay as disclosed in any of the above embodiments. This electronic device may include energy storage devices, etc.

[0049] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0050] The above embodiments are merely illustrative of several implementation methods described in detail, but they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this specification, and these all fall within the scope of protection of this specification. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A relay driving circuit, characterized in that, It includes a first switch module, a second switch module, a first capacitor module, and a second capacitor module; The control terminal of the first switch module is used to receive a control voltage; the first terminal of the first switch module is grounded; the second terminal of the first switch module is connected to the control terminal of the second switch module; the first switch module is used to respond to the control voltage and control the second switch module to turn on. The first terminal of the second switch module is used to receive a reference voltage; the second terminal of the second switch module is connected to the first terminal of the first capacitor module; the second switch module is used to transmit the reference voltage to the first capacitor module so as to charge the first capacitor module using the reference voltage. The second terminal of the first capacitor module is connected to the first terminal of the second capacitor module; the first capacitor module is used to sequentially output the reference voltage and the first voltage to the second capacitor module during the charging process, wherein the first voltage is less than the reference voltage; The second terminal of the second capacitor module is used to receive the reference voltage; The third terminal of the second capacitor module is grounded; the fourth terminal of the second capacitor module is used to connect to one end of the coil of the relay; the second capacitor module is used to output twice the reference voltage to one end of the coil of the relay in response to the reference voltage, and to output a second voltage to one end of the coil of the relay in response to the first voltage, wherein the second voltage is less than twice the reference voltage.

2. The relay driving circuit according to claim 1, characterized in that, The first capacitor module includes a first capacitor and a first resistor; the first capacitor and the first resistor are connected in parallel; one end of the first capacitor is the first terminal of the first capacitor module; the other end of the first capacitor is the second terminal of the first capacitor module.

3. The relay driving circuit according to claim 2, characterized in that, The second capacitor module includes a first diode, a second capacitor, a second resistor, and a third resistor; The positive terminal of the first diode is the second terminal of the second capacitor module, and the negative terminal of the first diode is connected to one end of the second resistor; the other end of the second resistor is connected to one end of the second capacitor, and the other end of the second capacitor is connected to one end of the third resistor; the other end of the third resistor is the third terminal of the second capacitor module, the other end of the second resistor is the fourth terminal of the second capacitor module, and one end of the third resistor is the first terminal of the second capacitor module.

4. The relay driving circuit according to claim 3, characterized in that, The first voltage is determined by the reference voltage, the resistance value of the first resistor, and the resistance value of the third resistor, and the second voltage is determined by the reference voltage, the voltage of the first diode, the resistance value of the second resistor, and the resistance value of the relay coil.

5. The relay driving circuit according to claim 3, characterized in that, The first capacitor and the second capacitor include electrolytic capacitors; the capacitance values ​​of the first capacitor and the second capacitor are equal; the resistance values ​​of the first resistor and the third resistor are equal.

6. The relay driving circuit according to claim 1, characterized in that, The second end of the first switch module is also used to connect to the other end of the coil of the relay, and the first switch module is also used to ground the other end of the coil of the relay.

7. The relay driving circuit according to claim 6, characterized in that, The first switching module includes a fourth resistor, a fifth resistor, a third capacitor, a first switching transistor, and a transient diode; One end of the fourth resistor, the fifth resistor, and the third capacitor are all connected to the control terminal of the first switching transistor. The other ends of the fourth resistor and the third capacitor are connected to the first terminal of the first switching transistor. The other end of the fifth resistor is the control terminal of the first switching module. One end of the transient diode is connected to the second terminal of the first switching transistor, and the other end of the transient diode is connected to the first terminal of the first switching transistor. The first terminal of the first switching transistor is the first terminal of the first switching module, and the second terminal of the first switching transistor is the second terminal of the first switching module.

8. The relay driving circuit according to claim 1, characterized in that, The second switching module includes a sixth resistor, a seventh resistor, and a second switching transistor; One end of the sixth resistor is the control terminal of the second switch module, and the other end of the sixth resistor is connected to the control terminal of the second switch transistor; one end of the seventh resistor is connected to the control terminal of the second switch transistor, and the other end of the seventh resistor is connected to the first terminal of the second switch transistor; the first terminal of the second switch transistor is the first terminal of the second switch module, and the second terminal of the second switch transistor is the second terminal of the second switch module.

9. A relay, characterized in that, The invention includes an electromagnet, a spring, an armature, a contact, and a drive circuit for a relay as described in any one of claims 1-8. The drive circuit is connected to the coil of the electromagnet and is used to output a voltage to the coil to drive the electromagnet to attract the armature, thereby causing the armature to drive the contact to engage.

10. An electronic device, characterized in that, Includes the relay as described in claim 9.

Images