Relay control circuit, intelligent electric meter and relay device

Abstract

The utility model relates to the field of driver driving design, in particular to a relay control circuit, an intelligent electric meter and relay equipment, the relay control circuit comprises a driving chip, a magnetic latching relay group and a control module, and the control module is respectively connected with the driving chip and the magnetic latching relay group. The control module is used for controlling the magnetic latching relay group according to the driving chip, and the magnetic latching relay group comprises a single-coil magnetic latching relay and a double-coil magnetic latching relay. According to the relay control circuit, switching use of the single-coil magnetic latching relay and the double-coil magnetic latching relay is achieved through the control module, multi-scene application of the relay control circuit is achieved, the labor cost is reduced, and resource consumption is reduced.

Description

Technical Field

[0001] This utility model relates to the field of driver design, and in particular to a relay control circuit, a smart meter, and a relay device. Background Technology

[0002] Currently, commonly used relay control circuits are only suitable for driving single-coil magnetic latching drive circuits, which are only suitable for use in low-frequency signal environments. For applications such as high-frequency signal control, it is necessary to replace the single-coil magnetic latching driver with a dual-coil magnetic latching driver, which increases labor costs, time costs, and resource consumption. Therefore, those skilled in the art urgently need to design a drive circuit suitable for multiple application scenarios. Utility Model Content

[0003] The purpose of this utility model is to provide a relay control circuit, a smart meter, and a relay device. This control circuit enables the switching between single-coil magnetic latching relays and double-coil magnetic latching relays, increasing the applicability of the relay control circuit in multiple scenarios.

[0004] In a first aspect, this application provides a relay control circuit, the circuit comprising: a driver chip, a magnetic latching relay group, and a control module.

[0005] The control module is connected to the driver chip and the magnetic latching relay group respectively. The control module is used to control the magnetic latching relay group according to the driver chip. The magnetic latching relay group includes a single-coil magnetic latching relay and a double-coil magnetic latching relay.

[0006] In one embodiment, the control module includes a first diode, a second diode, a third diode, a fourth diode, and a double-pole double-throw switch.

[0007] The positive terminal of the first diode is connected to the dual-coil magnetic latching relay, and the negative terminal of the first diode is connected to the first pin of the driver chip;

[0008] The positive terminal of the second diode is connected to the second terminal of the double-pole double-throw switch, and the negative terminal of the second diode is connected to the third terminal of the double-pole double-throw switch, the single-coil magnetic latching relay, and the double-coil magnetic latching relay, respectively.

[0009] The positive terminal of the third diode is connected to the sixth terminal of the double-pole double-throw switch, and the negative terminal of the third diode is connected to the single-coil magnetic latching relay and the double-coil magnetic latching relay respectively.

[0010] The positive terminal of the fourth diode is connected to the fifth terminal of the double-pole double-throw switch, the single-coil magnetic latching relay, and the double-coil magnetic latching relay, respectively, and the negative terminal of the fourth diode is connected to the fourth pin of the driver chip.

[0011] The first terminal of the double-pole double-throw switch is connected to the first pin of the driver chip, and the fourth terminal of the double-pole double-throw switch is connected to the fourth pin of the driver chip.

[0012] In one embodiment, the circuit further includes a first resistor and a capacitor, the capacitor being connected in parallel across the two ends of the first resistor, one end of the first resistor being connected to a first pin of the driver chip, and the other end of the first resistor being connected to a fourth pin of the driver chip.

[0013] In one embodiment, the first diode, the second diode, the third diode, and the fourth diode are all any one of Schottky diodes, fast recovery diodes, rectifier diodes, and transient voltage suppressor diodes.

[0014] In one embodiment, the circuit further includes a second resistor and a third resistor, one end of the second resistor being connected to the seventh pin of the driver chip and the other end of the second resistor being connected to a first power supply, one end of the third resistor being connected to the sixth pin of the driver chip and the other end of the third resistor being connected to a second power supply.

[0015] In one embodiment, the driver chip is CN8031SHR.

[0016] A second aspect of this application is a smart meter, which includes the relay control circuit provided above.

[0017] A third aspect of this application provides a relay device, the device comprising the relay control circuit provided above.

[0018] The beneficial effects of this utility model are as follows: This application realizes the switching between single-coil magnetic latching relays and double-coil magnetic latching relays through the control module, realizes the application of relay control circuits in multiple scenarios, reduces labor costs and resource consumption. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a relay drive circuit in related technologies;

[0020] Figure 2 A structural block diagram of a relay control circuit as an exemplary embodiment of this application;

[0021] Figure 3 This is a schematic diagram of another relay control circuit as an exemplary embodiment of this application. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by one of ordinary skill in the art to which this utility model pertains. The terms "comprising" and similar expressions used herein mean that the element or object preceding the word covers the element or object listed following the word and its equivalents, but does not exclude other elements or objects.

[0023] In related technologies, such as Figure 1 As shown, this relay drive circuit is only suitable for driving single-coil magnetic latching relays. This drive circuit is only suitable for use in low-cost, low-power environments. For fields such as high-frequency signal control, single-coil magnetic latching drive circuits are not applicable. Therefore, to solve... Figure 1 To address the issues raised, an exemplary embodiment of this application provides a relay control circuit, such as... Figure 2 and Figure 3 As shown, the circuit includes: a driver chip 1, a magnetic latching relay group 2, and a control module 3. The control module 3 is connected to the driver chip 1 and the magnetic latching relay group 2 respectively. The control module 3 is used to control the magnetic latching relay group 2 according to the driver chip 1. The magnetic latching relay group 2 includes a single-coil magnetic latching relay 21 and a double-coil magnetic latching relay 22.

[0024] This application enables the switching between single-coil magnetic latching relays and dual-coil magnetic latching relays through a control module, achieving multi-scenario applicability of the relay control circuit, reducing labor costs and resource consumption.

[0025] In one embodiment, the driver chip is CN8031SHR. CN8031SHR is an H-bridge driver chip specifically designed for motor drives. It has a high voltage range and a large current output, adapting to the power requirements of different application scenarios. At the same time, CN8031SHR has extremely low current in standby mode, and its low power consumption characteristics extend the device's lifespan.

[0026] In one embodiment, such as Figure 3As shown, the control module 3 includes a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, and a double-pole double-throw switch key. The anode of the first diode D1 is connected to the double-coil magnetic latching relay 22, and the cathode of the first diode D1 is connected to the first pin OUTA of the driver chip. The anode of the second diode D2 is connected to the second terminal 2 of the double-pole double-throw switch key, and the cathode of the second diode D2 is connected to the third terminal 3 of the double-pole double-throw switch key, the single-coil magnetic latching relay 21, and the double-coil magnetic latching relay 22. The anode of the third diode D3 is connected to the sixth terminal 6 of the double-pole double-throw switch key, and the cathode of the third diode D3 is connected to the single-coil magnetic latching relay 21 and the double-coil magnetic latching relay 22. The anode of the fourth diode D4 is connected to the fifth terminal 5 of the double-pole double-throw switch key, the single-coil magnetic latching relay 21, and the double-coil magnetic latching relay 22, and the cathode of the fourth diode D4 is connected to the fourth pin of the driver chip. The first terminal 1 of the double-pole double-throw switch key is connected to the first pin of the driver chip, and the fourth terminal 4 of the double-pole double-throw switch key is connected to the fourth pin of the driver chip.

[0027] In this embodiment, as Figure 3 As shown, pins 8 and 5 of driver chip 1 are grounded (GND), and pins 2 and 3 of driver chip 1 are connected to the power supply VCC. OUTA and OUTB are output pins, and pins 7 (INB) and 6 (INA) are used for input control signals.

[0028] Specifically, this application uses a double-pole double-throw (DPDT) switch key to control the switching between single-coil magnetic latching relays and double-coil magnetic latching relays. In the default state, the first terminal 1 and the second terminal 2 of the DPDT switch key are connected, and the fourth terminal 4 and the sixth terminal 6 are connected. At this time, the relay control circuit controls the double-coil magnetic latching relay 22. When the DPDT switch key is pressed, the first terminal 1 and the third terminal 3 are connected, and the fourth terminal 4 and the fifth terminal 5 are connected. At this time, the relay control circuit controls the single-coil magnetic latching relay 21. This application uses a DPDT switch key in the control module to switch between single-coil magnetic latching relays and double-coil magnetic latching relays, expanding the applicability of the relay control circuit, reducing labor costs, and minimizing resource consumption.

[0029] In one embodiment, such as Figure 3As shown, the circuit also includes a second resistor R2 and a third resistor R3. One end of the second resistor R2 is connected to the seventh pin INB of the driver chip 1, and one end of the third resistor R3 is connected to the sixth pin INA of the driver chip 1. In this embodiment, the other end RELAY_1 of the second resistor R2 is input to a first power supply, which can be a high level, and the other end RELAY_2 of the third resistor R3 is input to a second power supply, which can be a low level.

[0030] The second resistor R2 and the third resistor R3 in this application can limit the current magnitude, avoid chip damage due to excessive signal source voltage, and prevent short circuit risk when directly connected to power supply. At the same time, the second resistor R2 and the third resistor R3 fix the input terminal to a high level or a low level, ensuring that the chip is in a deterministic state when there is no signal input.

[0031] In another embodiment, one or more of the second resistor R2 and the third resistor R3 may be provided according to circuit requirements, which will not be described in detail here.

[0032] In one possible embodiment, the first diode D1, the second diode D2, the third diode D3, and the fourth diode D4 can be any one of a Schottky diode, a fast recovery diode, a rectifier diode, and a transient voltage suppressor diode.

[0033] Among them, Schottky diodes reduce conduction losses and are suitable for circuits with high efficiency requirements. Fast recovery diodes have high voltage withstand capability and are suitable for high-voltage applications. Rectifier diodes have large current capacity and are suitable for power frequency rectification. Transient voltage suppressor diodes have fast response capability, bidirectional / unidirectional protection capability, and high energy absorption capability, adapting to different circuit requirements.

[0034] In another embodiment, one or more of the first diode D1, the second diode D2, the third diode D3, and the fourth diode D4 can be provided according to circuit requirements, which will not be described in detail here.

[0035] In one embodiment, such as Figure 3 As shown, the circuit also includes a first resistor R1 and a capacitor C1. The capacitor C1 is connected in parallel across the two ends of the first resistor R1. One end of the first resistor R1 is connected to the first pin OUTA of the driver chip 1, and the other end of the first resistor R1 is connected to the fourth pin OUTB of the driver chip 1.

[0036] In another embodiment, one or more of the first resistor R1 and capacitor C1 can be provided according to circuit requirements, which will not be described in detail here.

[0037] The capacitor C1 in this application can provide instantaneous current buffering to reduce the impact of load sudden changes on the driver chip 1; the first resistor R1 limits the rate of current change to prevent the driver chip 1 from entering the nonlinear operating region due to overcurrent.

[0038] This application uses a first resistor R1 and a capacitor C1 connected in parallel between the driver chip 1 and the control module 3 to absorb the induced voltage of the single-coil magnetic latching relay and the double-coil magnetic latching relay when they are de-energized, as well as to suppress electromagnetic interference.

[0039] In another aspect, this application provides a smart meter that includes the relay control circuit described in any of the above embodiments.

[0040] In another aspect, this application provides a relay device that includes the relay control circuit described in any of the above embodiments.

[0041] Although the embodiments of this utility model have been described in detail above, it will be apparent to those skilled in the art that various modifications and variations can be made to these embodiments. However, it should be understood that such modifications and variations fall within the scope and spirit of this utility model as described in the claims. Moreover, the utility model described herein may have other embodiments and can be implemented or realized in various ways.

Claims

1. A relay control circuit, characterized in that, The circuit includes: a driver chip, a magnetic latching relay group, and a control module. The control module is connected to the driver chip and the magnetic latching relay group respectively. The control module is used to control the magnetic latching relay group according to the driver chip. The magnetic latching relay group includes a single-coil magnetic latching relay and a double-coil magnetic latching relay.

2. The relay control circuit according to claim 1, characterized in that, The control module includes a first diode, a second diode, a third diode, a fourth diode, and a double-pole double-throw switch. The positive terminal of the first diode is connected to the dual-coil magnetic latching relay, and the negative terminal of the first diode is connected to the first pin of the driver chip; The positive terminal of the second diode is connected to the second terminal of the double-pole double-throw switch, and the negative terminal of the second diode is connected to the third terminal of the double-pole double-throw switch, the single-coil magnetic latching relay, and the double-coil magnetic latching relay, respectively. The positive terminal of the third diode is connected to the sixth terminal of the double-pole double-throw switch, and the negative terminal of the third diode is connected to the single-coil magnetic latching relay and the double-coil magnetic latching relay respectively. The positive terminal of the fourth diode is connected to the fifth terminal of the double-pole double-throw switch, the single-coil magnetic latching relay, and the double-coil magnetic latching relay, respectively, and the negative terminal of the fourth diode is connected to the fourth pin of the driver chip. The first terminal of the double-pole double-throw switch is connected to the first pin of the driver chip, and the fourth terminal of the double-pole double-throw switch is connected to the fourth pin of the driver chip.

3. The relay control circuit according to claim 2, characterized in that, The circuit also includes a first resistor and a capacitor, with the capacitor connected in parallel across the two ends of the first resistor. One end of the first resistor is connected to the first pin of the driver chip, and the other end of the first resistor is connected to the fourth pin of the driver chip.

4. The relay control circuit according to claim 2, characterized in that, The first diode, the second diode, the third diode, and the fourth diode are all any one of Schottky diodes, fast recovery diodes, rectifier diodes, and transient voltage suppressor diodes.

5. The relay control circuit according to claim 1, characterized in that, The circuit also includes a second resistor and a third resistor. One end of the second resistor is connected to the seventh pin of the driver chip, and the other end of the second resistor is connected to the first power supply. One end of the third resistor is connected to the sixth pin of the driver chip, and the other end of the third resistor is connected to the second power supply.

6. The relay control circuit according to claim 1, characterized in that, The driver chip is CN8031SHR.

7. A smart meter, characterized in that, The smart meter includes the relay control circuit as described in any one of claims 1 to 6.

8. A relay device, characterized in that, The device includes the relay control circuit as described in any one of claims 1 to 6.

Images