An electric energy meter relay control circuit

Abstract

This utility model relates to the field of electricity meter control technology, specifically to an electricity meter relay control circuit, including an electricity meter MCU terminal, surface mount resistors RW2 and RW3, a wire-wound resistor RW5, and a relay driver chip. The drive circuit offers flexible and convenient control; the electricity meter MCU terminal only needs to control two signals to control the on / off state of the customized relay: the relay closing and closing signals at the electricity meter MCU terminal, and the relay closing and closing signals. The circuit is low-cost, highly reliable, and has a fast response speed, enabling long-term stable operation. It is particularly suitable for driving control under high currents such as 200A. Furthermore, by connecting the wire-wound resistor RW5 in series on the control line, the load can be increased, reducing the drive current and ensuring stable circuit operation and electrical safety. This prevents system power outages and other malfunctions due to insufficient drive capability, thus avoiding disruption to normal use.

Description

Technical Field

[0001] This utility model relates to the field of electricity meter control technology, specifically to an electricity meter relay control circuit. Background Technology

[0002] With the rapid advancement of industrialization and urbanization, industrial parks, large commercial complexes, and data centers are constantly emerging. These areas have high electricity demand, placing higher demands on power supply and management. In this context, some regions have stipulated that electricity meters must have a maximum current of 200A to accommodate the stable power consumption of high-power equipment. Simultaneously, electricity meters are required to have built-in relays for remote control and precise response to current changes, ensuring electrical safety. However, due to the excessively high current adaptation requirements, conventional electricity meter relays designed for low currents are unsuitable, potentially leading to insufficient driving capacity and system power outages, affecting stable operation and electrical safety. Utility Model Content

[0003] The purpose of this utility model is to provide a relay control circuit for an electricity meter to solve the existing technical problems mentioned in the background.

[0004] To solve the above-mentioned technical problems, the technical solution provided by this utility model is as follows: a power meter relay control circuit is provided, including a power meter MCU terminal, a surface mount resistor RW2, a surface mount resistor RW3, a wire-wound resistor RW5, and a relay driver chip; One end of the surface mount resistor RW2 is connected to the relay closing signal on the MCU side of the energy meter, and the other end is connected to the signal input pin INB of the relay driver chip UW1; one end of the surface mount resistor RW3 is connected to the relay opening signal on the MCU side of the energy meter, and the other end is connected to the signal input pin INA of the relay driver chip UW1; the relay closing signal and the relay opening signal on the MCU side of the energy meter are respectively connected to the power supply DVDD of the energy meter system. The signal output pin OUTB of the relay driver chip UW1 is connected to the relay control closing signal, and the signal output pin OUTA is connected to one end of the winding resistor RW5. The other end of the winding resistor RW5 is connected to the relay control opening signal. One end of the relay control interface JRL1 is connected to the relay control closing signal, and the other end is connected to the relay control opening signal. The internal reference pin GND of the relay control chip UW1 is connected to the energy meter system reference ground MGND, and the power input pin VDD is connected to the relay input power supply RVCC.

[0005] Based on the above technical solution, a surface-mount capacitor CW1 is also included. One end of the surface-mount capacitor CW1 is connected to the relay control closing signal, and the other end is connected to the relay control opening signal.

[0006] Based on the above technical solution, a surface mount capacitor CW2 is also included. One end of the surface mount resistor CW2 is connected to the relay input power supply RVCC, and the other end is connected to the energy meter system reference ground MGND.

[0007] Based on the above technical solution, an electrolytic capacitor EW1 is also included. The positive terminal of the electrolytic capacitor EW1 is connected to the relay input power supply RVCC, and the negative terminal is connected to the energy meter system reference ground MGND.

[0008] Based on the above technical solution, a surface mount resistor RW1 is also included. One end of the surface mount resistor RW1 is connected to the closing signal of the relay at the MCU end of the energy meter, and the other end is connected to the power supply DVDD of the energy meter system.

[0009] Based on the above technical solution, a surface mount resistor RW4 is also included. One end of the surface mount resistor RW4 is connected to the trip signal of the relay at the MCU end of the energy meter, and the other end is connected to the power supply DVDD of the energy meter system.

[0010] Based on the above technical solution, the driving current of the electrical drive chip reaches 1.5A, and the capacitance of the electrolytic capacitor is greater than 4700uf.

[0011] Based on the above technical solution, when the relay closing signal of the MCU terminal of the energy meter is high and the relay opening signal of the MCU terminal of the energy meter is low, the relay driver chip UW1 controls the relay to close when the control closing signal is high and the relay to open when the control opening signal is low, and the relay is closed; otherwise, the relay is open.

[0012] The beneficial effects of the technical solution provided by this utility model are as follows: This utility model provides a relay control circuit for an energy meter. The drive circuit is flexible and convenient to control. The MCU of the energy meter only needs to control two signals to control the on / off of the customized relay: the relay closing signal and the relay opening signal at the MCU end, and the relay opening signal and the relay closing signal. The circuit has low cost, high reliability, and fast response speed, and can achieve long-term stable operation. It is especially suitable for drive control under high current such as 200A. At the same time, by connecting a wire-wound resistor RW5 in series on the control line, the load can be increased and the drive current can be reduced, ensuring the stable operation of the circuit and electrical safety, and avoiding system power outages and other faults due to insufficient drive capability, which would affect normal use. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the circuit structure of this utility model; Figure 2 This is a partial circuit structure diagram of the relay driver chip UW1 in this utility model; Detailed Implementation The present invention will be further described below with reference to the accompanying drawings and embodiments: In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0014] In the description of this utility model, it should be understood that the terms "left", "right", "front", "rear", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0015] like Figures 1 to 2 As shown, a power meter relay control circuit includes a power meter MCU terminal, a surface mount resistor RW2, a surface mount resistor RW3, a wire-wound resistor RW5, and a relay driver chip. One end of the surface mount resistor RW2 is connected to the relay closing signal on the MCU side of the energy meter, and the other end is connected to the signal input pin INB of the relay driver chip UW1; one end of the surface mount resistor RW3 is connected to the relay opening signal on the MCU side of the energy meter, and the other end is connected to the signal input pin INA of the relay driver chip UW1; the relay closing signal and the relay opening signal on the MCU side of the energy meter are respectively connected to the power supply DVDD of the energy meter system. The signal output pin OUTB of the relay driver chip UW1 is connected to the relay control closing signal, and the signal output pin OUTA is connected to one end of the winding resistor RW5. The other end of the winding resistor RW5 is connected to the relay control opening signal. One end of the relay control interface JRL1 is connected to the relay control closing signal, and the other end is connected to the relay control opening signal. The internal reference pin GND of the relay control chip UW1 is connected to the energy meter system reference ground MGND, and the power input pin VDD is connected to the relay input power supply RVCC.

[0016] This utility model provides a relay control circuit for an energy meter. The drive circuit is flexible and convenient to control. The MCU of the energy meter only needs to control two signals to control the on / off of the customized relay: the relay closing signal and the relay opening signal at the MCU end, and the relay opening signal and the relay closing signal. The circuit has low cost, high reliability, and fast response speed, and can achieve long-term stable operation. It is especially suitable for drive control under high current such as 200A. At the same time, by connecting a wire-wound resistor RW5 in series on the control line, the load can be increased and the drive current can be reduced, ensuring the stable operation of the circuit and electrical safety, and avoiding system power outages and other faults due to insufficient drive capability, which would affect normal use.

[0017] As shown in the figure, the relay closing signal at the MCU end of the energy meter is represented by M_Connector_Off_Control, and the relay opening signal at the MCU end of the energy meter is represented by M_Connector_On_Control; the relay control closing signal is represented by Connector_Off_In, and the relay control opening signal is represented by Connector_On_In.

[0018] Based on the above technical solution, a surface-mount capacitor CW1 is also included. One end of the surface-mount capacitor CW1 is connected to the relay control closing signal, and the other end is connected to the relay control opening signal. By providing the surface-mount capacitor CW1, it acts as a protective device, absorbing the voltage spikes generated when the relay operates, thus preventing adverse effects on the relay driver chip.

[0019] Based on the above technical solution, a surface-mount capacitor CW2 is also included. One end of the surface-mount capacitor CW2 is connected to the relay input power supply RVCC, and the other end is connected to the energy meter system reference ground MGND. By incorporating the surface-mount capacitor CW2 as a filtering device, the relay input power supply is filtered, resulting in smoother voltage and more stable operation.

[0020] Based on the above technical solution, an electrolytic capacitor EW1 is also included. The positive terminal of the electrolytic capacitor EW1 is connected to the relay input power supply RVCC, and the negative terminal is connected to the energy meter system reference ground MGND.

[0021] By connecting a large-capacity electrolytic capacitor in parallel with the relay input power supply RVCC to the reference ground, the system power outage caused by insufficient driving capability of the energy meter can be avoided. Preferably, the capacitance of the electrolytic capacitor is greater than or equal to 4700uF to meet the requirements of full-current driving; more preferably, the capacitance value of the electrolytic capacitor can be adjusted according to the power supply scheme and the relay input voltage.

[0022] Based on the above technical solution, a surface mount resistor RW1 is also included. One end of the surface mount resistor RW1 is connected to the closing signal of the relay at the MCU end of the energy meter, and the other end is connected to the power supply DVDD of the energy meter system.

[0023] Based on the above technical solution, a surface mount resistor RW4 is also included. One end of the surface mount resistor RW4 is connected to the trip signal of the relay at the MCU end of the energy meter, and the other end is connected to the power supply DVDD of the energy meter system.

[0024] By setting up surface mount resistors RW1 and RW4, which are connected to the power supply of the energy meter system through resistors, the two control signals are pulled up to a high level when the relay is not controlled. If the circuit breaker needs to be opened or closed, the corresponding signal output of the MCU is simply lowered.

[0025] Based on the above technical solution, the driving current of the electrical drive chip reaches 1.5A, and the capacitance of the electrolytic capacitor is greater than 4700uf.

[0026] The relay driver chip is model AL888, which has a high current driving capability, with a driving current of up to 1.5A, to adapt to the normal operation of a 200A high current relay.

[0027] Based on the above technical solution, when the relay closing signal of the MCU terminal of the energy meter is high and the relay opening signal of the MCU terminal of the energy meter is low, the relay driver chip UW1 controls the relay to close when the control closing signal is high and the relay to open when the control opening signal is low, and the relay is closed; otherwise, the relay is open.

[0028] During the control process, when the relay closing signal M_Connector_Off_Control at the MCU end of the energy meter is high and the relay opening signal M_Connector_On_Control at the MCU end of the energy meter is low, the relay driver chip controls the relay closing signal Connector_Off_In to be high and the relay opening signal Connector_On_In to be low, thus closing the relay. When the relay tripping signal M_Connector_On_Control on the MCU side of the energy meter is high, and the relay closing signal M_Connector_Off_Control on the MCU side of the energy meter is low, the relay driver chip controls the relay to tripping signal Connector_On_In to be high and closing signal Connector_Off_In to be low, thus disconnecting the relay.

[0029] The foregoing has shown and described the basic principles and main features of this utility model. It is obvious to those skilled in the art that this utility model is not limited to the details of the above exemplary embodiments. Therefore, the embodiments should be regarded as exemplary and non-limiting. The scope of this utility model is defined by the appended claims rather than the foregoing description. Therefore, it is intended to include all changes that fall within the meaning and scope of the equivalents of the claims within this utility model.

[0030] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A relay control circuit for an electricity meter, characterized in that, This includes the MCU terminal of the energy meter, surface mount resistors RW2 and RW3, wire-wound resistors RW5, and relay driver chip; One end of the surface mount resistor RW2 is connected to the relay closing signal on the MCU side of the energy meter, and the other end is connected to the signal input pin INB of the relay driver chip UW1; one end of the surface mount resistor RW3 is connected to the relay opening signal on the MCU side of the energy meter, and the other end is connected to the signal input pin INA of the relay driver chip UW1; the relay closing signal and the relay opening signal on the MCU side of the energy meter are respectively connected to the power supply DVDD of the energy meter system. The signal output pin OUTB of the relay driver chip UW1 is connected to the relay control closing signal, and the signal output pin OUTA is connected to one end of the winding resistor RW5. The other end of the winding resistor RW5 is connected to the relay control opening signal. One end of the relay control interface JRL1 is connected to the relay control closing signal, and the other end is connected to the relay control opening signal. The internal reference pin GND of the relay control chip UW1 is connected to the energy meter system reference ground MGND, and the power input pin VDD is connected to the relay input power supply RVCC.

2. The energy meter relay control circuit according to claim 1, characterized in that, It also includes a surface-mount capacitor CW1, one end of which is connected to the relay control closing signal and the other end is connected to the relay control opening signal.

3. The energy meter relay control circuit according to claim 1, characterized in that, It also includes a surface-mount capacitor CW2, one end of which is connected to the relay input power supply RVCC, and the other end is connected to the energy meter system reference ground MGND.

4. The energy meter relay control circuit according to claim 1, characterized in that, It also includes an electrolytic capacitor EW1, the positive terminal of which is connected to the relay input power supply RVCC, and the negative terminal is connected to the energy meter system reference ground MGND.

5. The relay control circuit for an energy meter according to claim 1, characterized in that, It also includes a surface mount resistor RW1, one end of which is connected to the closing signal of the relay at the MCU end of the energy meter, and the other end is connected to the power supply DVDD of the energy meter system.

6. The energy meter relay control circuit according to claim 4, characterized in that, It also includes a surface mount resistor RW4, one end of which is connected to the trip signal of the relay at the MCU end of the energy meter, and the other end is connected to the power supply DVDD of the energy meter system.

7. The energy meter relay control circuit according to claim 4, characterized in that, The driving current of the electrical drive chip reaches 1.5A, and the capacitance of the electrolytic capacitor is greater than 4700uf.

8. The energy meter relay control circuit according to claim 1, characterized in that, When the relay closing signal at the MCU end of the energy meter is high and the relay opening signal at the MCU end is low, the relay driver chip UW1 controls the relay to close when the closing signal is high and to open when the opening signal is low, thus closing the relay; otherwise, the relay opens.

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