Infrared communication circuit and device for power meter during power failure

Abstract

The utility model relates to an infrared communication circuit and device when electric energy meter power failure, the circuit includes electric energy meter MCU, power control module, infrared communication receiving module and infrared communication sending module, wherein, power control module first end connects electric energy meter system power, and the power control module first end connects lithium cell when electric energy meter system power power failure, electric energy meter MCU exports infrared enable control signal, and infrared enable control signal connects power control module second end, infrared communication receiving module and infrared communication sending module connect power control module third end respectively, infrared communication receiving module includes infrared receiving tube and first triode, and when the circuit infrared communication, infrared receiving tube conducts, and first triode is cut off, and the infrared receiving signal of electric energy meter MCU is low level. System power power failure automatically switches to lithium cell power supply, so that electric energy meter still can carry out data transmission through infrared communication module under the condition of power failure, guarantees the continuity and integrity of data acquisition.

Description

Technical Field

[0001] This utility model relates to the field of electricity meter technology, specifically to an infrared communication circuit and device for an electricity meter when it loses power. Background Technology

[0002] With the development of smart grids, electricity meters, as key metering devices in power systems, are crucial for power supply and management due to the accuracy and real-time nature of their data. Traditional electricity meter reading methods rely on manual operation, which is inefficient and prone to errors. Therefore, contactless data transmission based on infrared communication technology is gradually becoming mainstream. This technology uses infrared light for data transmission, offering advantages such as strong anti-interference capabilities, high security, and low cost, making it particularly suitable for applications in complex industrial environments. The application of infrared communication in electricity meters primarily enables on-site meter reading, parameter configuration, and equipment debugging. This method avoids the inconvenience of traditional wired connections while reducing wiring costs and complexity. Infrared communication modules typically use standard protocols such as DL / T645 or Modbus, ensuring good compatibility with various smart meter models.

[0003] However, in certain situations, such as when a power system failure causes a power outage at the electricity meter, the existing infrared communication mechanism will not function properly. This is because infrared transmitting and receiving modules require a stable power supply to operate. Once power is lost, these components will cease to function, thus interrupting the data transmission path. This poses a significant challenge for regions with stringent requirements for the continuity of power data, as the inability to obtain electricity meter data in a timely manner during a power outage may result in the loss of critical information, impacting subsequent power management and maintenance. Utility Model Content

[0004] To address the aforementioned problems, this utility model provides an infrared communication circuit for an electricity meter when it loses power. The circuit includes an electricity meter MCU, a power control module, an infrared communication receiving module, and an infrared communication transmitting module; wherein... The first terminal of the power control module is connected to the power supply of the electricity meter system. When the power supply of the electricity meter system fails, the first terminal of the power control module is connected to the lithium battery. The MCU of the energy meter outputs an infrared enable control signal, which is connected to the second terminal of the power control module. The infrared communication receiving module and the infrared communication transmitting module are respectively connected to the third terminal of the power control module; The infrared communication receiving module includes an infrared receiving tube and a first transistor. When the circuit is in infrared communication mode, the infrared receiving tube is turned on and the first transistor is turned off, and the infrared receiving signal of the energy meter MCU is low level.

[0005] Furthermore, the power control module includes a PMOS transistor. When the infrared enable control signal controlled by the MCU of the energy meter is low, the PMOS transistor is turned on, and the energy meter system power supply or lithium battery supplies power to the infrared communication receiving module and the infrared communication transmitting module.

[0006] Based on the above scheme, the power control module further includes a first resistor, a second resistor, and a first capacitor; the source of the PMOS transistor has two paths, one of which is connected to the power supply of the lithium battery or energy meter system, and the other is connected to the infrared enable control signal through the first resistor; the drain of the PMOS transistor is connected to the infrared communication power supply; and the gate of the PMOS transistor is connected to the infrared enable control signal through the second resistor.

[0007] As a preferred embodiment, the infrared communication receiving module further includes a third resistor and a fourth resistor. The negative terminal of the infrared receiving tube is connected to the infrared communication power supply, the positive terminal of the infrared receiving tube is connected to the base of the first transistor, the base of the first transistor is grounded through the third resistor, the emitter of the first transistor is connected to the infrared communication power supply, and the collector of the first transistor is connected to the infrared receiving signal of the energy meter MCU. The infrared receiving signal of the energy meter MCU is also grounded through the fourth resistor.

[0008] Based on the above scheme, the infrared communication transmitting module includes a second transistor and an infrared emitting diode. When the infrared transmitting signal controlled by the MCU of the energy meter is at a low level, the second transistor is turned on, and the infrared emitting diode transmits the signal outward.

[0009] As a preferred embodiment, the infrared communication transmitting module further includes a fifth resistor, a sixth resistor, and a seventh resistor. The infrared communication power supply is connected to the emitter of the second transistor through the fifth resistor. The base of the second transistor is connected to the infrared transmission signal of the energy meter MCU through the sixth resistor. The collector of the second transistor is connected to the positive terminal of the infrared emitting diode through the seventh resistor. The negative terminal of the infrared emitting diode is grounded.

[0010] On the other hand, this application also provides an infrared communication device for when an electricity meter loses power, including the infrared communication circuit for when an electricity meter loses power as described above.

[0011] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. When the system power fails, it automatically switches to lithium battery power, enabling the energy meter to continue transmitting data through the infrared communication module even when power is off, thus ensuring the continuity and integrity of data acquisition; 2. The infrared receiving module realizes the stable level conversion of the infrared received signal. When the infrared receiving tube is turned on, the first transistor is turned off, so that the infrared received signal of the energy meter MCU is kept at a low level, which improves the anti-interference capability and reliability of infrared communication. 3. By using the MCU of the power meter to control the infrared enable signal, the infrared communication module is powered on demand. The infrared communication module is only turned on when communication is needed, which reduces system power consumption, extends the life of lithium battery, and ensures the timeliness and reliability of communication. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of each circuit module of this utility model; Figure 2 This is a circuit diagram of the power control module of this utility model; Figure 3 This is a circuit diagram of the infrared communication receiving module of this utility model; Figure 4 This is a circuit diagram of the infrared communication transmitting module of this utility model. Detailed Implementation

[0013] The present invention will be further described below with reference to the accompanying drawings: 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] like Figure 1 As shown, this utility model provides an infrared communication circuit for an electricity meter when it loses power. The circuit includes an electricity meter MCU, a power control module, an infrared communication receiving module, and an infrared communication transmitting module; wherein, The first terminal of the power control module is connected to the power supply MVDD of the electricity meter system. When the power supply of the electricity meter system fails, the first terminal of the power control module is connected to the lithium battery. The MCU of the electricity meter outputs an infrared enable control signal, which is connected to the second terminal of the power control module. The infrared communication receiving module and the infrared communication transmitting module are respectively connected to the third terminal of the power control module.

[0015] like Figure 2As shown, the power control module specifically includes a PMOS transistor Qi1, a first resistor RI4, a second resistor RI5, and a first capacitor CC1. The source of the PMOS transistor has two paths: one is connected to the power supply MVDD of the lithium battery or energy meter system, and the other is connected to the infrared enable control signal Infrared_Control through RI4. The drain of Qi1 is connected to the infrared communication power supply VDD, and the gate of Qi1 is connected to the infrared enable control signal Infrared_Control through the second resistor.

[0016] The power control module works as follows: When the infrared enable control signal Infrared_Control controlled by the MCU of the energy meter is low, Qi1 is turned on, and the MVDD or lithium battery supplies power to the infrared communication receiving module and the infrared communication transmitting module through Qi1; when the infrared enable control signal Infrared_Control controlled by the MCU of the energy meter is high, Qi1 is turned off, and the MVDD or lithium battery cannot supply power to the infrared communication receiving module and the infrared communication transmitting module through Qi1.

[0017] like Figure 3 As shown, the infrared communication receiving module includes an infrared receiving tube DI1, a first transistor QI3, a third resistor RI6, and a fourth resistor RI7. The negative terminal of DI1 is connected to the infrared communication power supply VDD, the positive terminal of DI1 is connected to the base of QI3, the base of QI3 is also grounded through RI6, the emitter of QI3 is connected to VDD, and the collector of QI3 is connected to the infrared receiving signal Infrared_RXD of the energy meter MCU. Infrared_RXD is also grounded to GND through RI7.

[0018] The working principle of the infrared communication receiving module is as follows: When infrared communication is not in progress, DI1 is not turned on, the base of the first transistor QI3 is at a low level, and QI3 is turned on. At this time, the infrared receiving signal Infrared_RXD of the energy meter MCU is at a high level. When infrared communication is in progress, DI1 is turned on, the base of QI3 becomes high, and QI3 is turned off. At this time, the infrared receiving signal Infrared_RXD of the energy meter MCU is at a low level.

[0019] like Figure 4 As shown, the infrared communication transmitting module includes a second transistor Qi2, an infrared emitting diode DI2, a fifth resistor RI2, a sixth resistor RI1, and a seventh resistor RI3. The infrared communication power supply is connected to the emitter of Qi2 through RI2. The base of Qi2 is connected to the infrared transmission signal Infrared_TXD of the energy meter MCU through RI1. The collector of Qi2 is connected to the positive terminal of DI2 through RI3. The negative terminal of DI2 is grounded to GND.

[0020] The working principle of the infrared communication transmission module is as follows: when the infrared transmission signal Infrared_TXD of the energy meter MCU is low, the second transistor QI2 is turned on, and the infrared emitting tube DI2 transmits signals outward. When the infrared transmission signal Infrared_TXD of the energy meter MCU is high, QI2 is turned off, and DI2 cannot transmit signals.

[0021] The infrared communication circuit operates as follows: When the power supply MVDD of the energy meter system is normally powered, the energy meter MCU controls the infrared enable control signal Infrared_Control to be high, the PMOS transistor QI1 is cut off, and the infrared communication module is in a power-off state. When infrared communication is required, the MCU sets Infrared_Control to low, QI1 is turned on, and the system power supply MVDD powers the infrared communication module. If the system power supply MVDD fails, the power control module automatically switches to lithium battery power supply, providing power support to the infrared communication module through QI1.

[0022] When an external infrared signal arrives, the infrared receiver DI1 is turned on, causing the base of the first transistor Qi3 to go high. Qi3 is then turned off, causing the infrared receiving signal Infrared_RXD of the energy meter MCU to go low. When there is no infrared signal, DI1 is not turned on, Qi3 is turned on, and Infrared_RXD remains high. The MCU identifies the received infrared signal by detecting the level change of Infrared_RXD.

[0023] When the MCU needs to send data, it sets the infrared transmission signal Infrared_TXD to a low level, turns on the second transistor QI2, and the current flows through the fifth resistor RI2, QI2, and the seventh resistor RI3 through the infrared emitting diode DI2, causing DI2 to send out an infrared signal.

[0024] On the other hand, this application also provides an infrared communication device for electricity meters when power is lost, including the infrared communication circuit for electricity meters when power is lost described above. By integrating the infrared communication circuit for electricity meters when power is lost, the function of infrared communication can still be performed when the system power is cut off, ensuring that the electricity meter can complete data acquisition and transmission tasks even when power is off, and improving the integrity and reliability of data acquisition by the electricity meter under abnormal power supply conditions.

[0025] 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.

[0026] 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. An infrared communication circuit for an electric energy meter at power down, characterized by, The circuit includes an energy meter MCU, a power control module, an infrared communication receiving module, and an infrared communication transmitting module; wherein, The first terminal of the power control module is connected to the power supply of the electricity meter system. When the power supply of the electricity meter system fails, the first terminal of the power control module is connected to the lithium battery. The MCU of the energy meter outputs an infrared enable control signal, which is connected to the second terminal of the power control module. The infrared communication receiving module and the infrared communication transmitting module are respectively connected to the third terminal of the power control module; The infrared communication receiving module includes an infrared receiving tube and a first transistor. When the circuit is in infrared communication mode, the infrared receiving tube is turned on and the first transistor is turned off, and the infrared receiving signal of the energy meter MCU is low level.

2. The infrared communication circuit for power meter operation when power is lost, as described in claim 1, is characterized in that... The power control module includes a PMOS transistor. When the infrared enable control signal controlled by the MCU of the energy meter is low, the PMOS transistor is turned on, and the energy meter system power supply or lithium battery supplies power to the infrared communication receiving module and the infrared communication transmitting module.

3. The infrared communication circuit for a power meter in case of power failure according to claim 2, characterized in that, The power control module further includes a first resistor, a second resistor, and a first capacitor; the source of the PMOS transistor has two paths, one of which is connected to the power supply of the lithium battery or energy meter system, and the other is connected to the infrared enable control signal through the first resistor; the drain of the PMOS transistor is connected to the infrared communication power supply; and the gate of the PMOS transistor is connected to the infrared enable control signal through the second resistor.

4. The infrared communication circuit for a power meter in case of power failure according to claim 2, characterized in that, The infrared communication receiving module further includes a third resistor and a fourth resistor. The negative terminal of the infrared receiving tube is connected to the infrared communication power supply, the positive terminal of the infrared receiving tube is connected to the base of the first transistor, the base of the first transistor is grounded through the third resistor, the emitter of the first transistor is connected to the infrared communication power supply, and the collector of the first transistor is connected to the infrared receiving signal of the energy meter MCU. The infrared receiving signal of the energy meter MCU is also grounded through the fourth resistor.

5. The infrared communication circuit for a power meter in the event of a power outage, as described in claim 4, is characterized in that... The infrared communication transmitting module includes a second transistor and an infrared emitting diode. When the infrared transmitting signal controlled by the MCU of the energy meter is at a low level, the second transistor is turned on, and the infrared emitting diode transmits the signal outward.

6. The infrared communication circuit for a power meter in case of power failure according to claim 5, characterized in that, The infrared communication transmitting module also includes a fifth resistor, a sixth resistor, and a seventh resistor. The infrared communication power supply is connected to the emitter of the second transistor through the fifth resistor. The base of the second transistor is connected to the infrared transmission signal of the energy meter MCU through the sixth resistor. The collector of the second transistor is connected to the positive terminal of the infrared emitting diode through the seventh resistor. The negative terminal of the infrared emitting diode is grounded.

7. An infrared communication device for an electricity meter in the event of a power outage, characterized in that, Includes the infrared communication circuit for power meter failure as described in any one of claims 1-6.

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