Reset circuit for intelligent electric meter and electronic equipment

Abstract

The utility model belongs to the technical field of intelligent electric meters, and discloses a reset circuit for an intelligent electric meter and an electronic device, the reset circuit comprises a DC power supply module, a power supply conversion module, a communication module and a control module; the direct-current power supply module is connected with the power supply conversion module and is used for providing analog voltage for the reset circuit and outputting the analog voltage to the power supply conversion module; the power supply conversion module is connected with the communication module, converts the analog voltage into the working voltage of the reset circuit, and outputs the working voltage of the reset circuit to the communication module; the communication module is connected with the control module, and the communication module resets the reset circuit according to the received working voltage of the reset circuit; and the control module is connected with the power supply conversion module, and is used for controlling the on and off of the power supply conversion module and controlling the reset of the reset circuit by the communication module. The reset circuit provided by the utility model can realize effective reset of the communication module.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric energy meters, and in particular relates to a reset circuit and electronic equipment for smart electric meters. Background Art

[0002] With the rapid development of the world economy, the demand for electricity in all walks of life is increasing. In the early days, the collection of electricity data information was done manually by reading meters. However, the labor cost of this model is high, and it is not possible to know immediately when the electric energy meter fails. Therefore, in order to reduce the comprehensive cost of power applications, electric energy meters with communication functions have emerged. Each electric energy meter is equipped with an independent communication module. After the electric energy meter collects metering data, it transmits the data to the server or the main station through the communication module. The automatic collection and upload of metering data has gradually replaced manual meter reading. Although electric energy meters with communication functions have gradually become the mainstream of power applications, the actual power grid environment is complex and harsh, which can easily cause abnormal operation of the communication module, resulting in the inability to upload data to the server or the main station normally, affecting the integrity, reliability and timeliness of the data.

[0003] In order to solve the problem that the communication module cannot upload data normally when it is in an abnormal state, the prior art implements the reset function by controlling the reset pin of the communication module. However, this method cannot achieve 100% effective reset in actual applications. Some communication modules must be completely powered off and then powered on again to be effectively reset.

[0004] In view of this, how to propose a reset circuit that can ensure the effective reset of the communication module of the smart meter is a technical problem that needs to be solved urgently. Utility Model Content

[0005] In order to solve the technical problem that the communication module of the above-mentioned smart meter may not be reset in an abnormal state, the utility model provides a reset circuit and an electronic device.

[0006] In a first aspect, the utility model provides a reset circuit for a smart meter, the reset circuit comprising: a DC power supply module, a power conversion module, a communication module and a control module;

[0007] The output end of the DC power supply module is connected to the input end of the power conversion module, and the DC power supply module is used to provide an analog voltage to the reset circuit and output the analog voltage to the power conversion module;

[0008] The output end of the power conversion module is connected to the input end of the communication module, and the power conversion module is used to convert the analog voltage into the working voltage of the reset circuit, and output the working voltage of the reset circuit to the communication module;

[0009] The reset end of the communication module is connected to the output end of the control module, and the communication module resets the reset circuit according to the working voltage of the reset circuit received;

[0010] The output end of the control module is connected to the control end of the power conversion module. The control module is used to control the on and off of the power conversion module and control the communication module to reset the reset circuit.

[0011] Furthermore, the DC power supply module includes a supply voltage, the power conversion module includes a first input pin, and the supply voltage is connected to the first input pin.

[0012] Furthermore, the power conversion module further includes a first output pin, the communication module includes a second input pin, and the first output pin is connected to the second input pin.

[0013] Furthermore, the control module includes a signal control unit, the power conversion module also includes an enable control pin, and the communication module also includes a reset interface unit; the signal control unit is connected to the enable control pin and the reset interface unit respectively.

[0014] Furthermore, the reset circuit also includes a discharge module, which is connected to the power conversion module and the control module respectively, and is used to discharge residual charge after the communication module is powered off.

[0015] Furthermore, the discharge module includes a first resistor and a transistor, one end of the first resistor is connected to the first output pin, and the other end of the first resistor is connected to the emitter of the transistor.

[0016] Furthermore, the discharge module also includes a second resistor and a third resistor, one end of the second resistor is respectively connected to the enable control pin and the base of the transistor, the other end of the second resistor is connected to the third resistor, one end of the third resistor is respectively connected to the enable control pin and the second resistor, and the other end of the third resistor is grounded.

[0017] Furthermore, the control module also includes a main control chip, and the main control chip is used to send a control signal to the signal control unit.

[0018] Furthermore, the transistor is a PNP transistor.

[0019] In a second aspect, the utility model provides an electronic device, comprising a device body and a reset circuit for a smart meter as described in any one of the first aspects above, which is arranged on the device body.

[0020] Compared with the prior art, the reset circuit for the smart meter provided by the utility model controls the on and off of the power conversion module through the control module, and controls the reset of the communication module at the same time, thereby achieving effective reset of the communication module and improving the reliability of the communication module. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of a framework structure of a reset circuit for a smart meter provided in an embodiment of the utility model;

[0022] Figure 2 A schematic structural diagram of a reset circuit for a smart meter provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0023] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described here are only used to explain the utility model and are not used to limit the utility model.

[0024] In order to make the description of the disclosed content more detailed and complete, the following is an illustrative description of the implementation method and specific examples of the utility model; however, this is not the only form of implementing or using the specific examples of the utility model. The implementation method covers the features of multiple specific examples and the method steps and their sequence for constructing and operating these specific examples. However, other specific examples can also be used to achieve the same or equal functions and step sequences. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0025] It should be noted that the terms "first", "second", etc. in the specification and claims of the present utility model and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the utility model described herein can be implemented in an order other than those illustrated or described herein.

[0026] In the description of the embodiments of the present invention, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; the “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two, and other quantifiers are similar. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention, and the embodiments of the present application and the features in the embodiments may be combined with each other without conflict.

[0027] In order to solve the technical problem that the existing communication module may not be reset in an abnormal state, the utility model provides a reset circuit for a smart meter, please refer to Figure 1-2 , Figure 1 A schematic diagram of a framework structure of a reset circuit for a smart meter provided in an embodiment of the utility model, Figure 2 A structural schematic diagram of a reset circuit for a smart meter provided in an embodiment of the utility model, the reset circuit includes: a DC power supply module, a power conversion module, a communication module and a control module; the output end of the DC power supply module is connected to the input end of the power conversion module, the DC power supply module is used to provide an analog voltage to the reset circuit, and output the analog voltage to the power conversion module; the output end of the power conversion module is connected to the input end of the communication module, the power conversion module is used to convert the analog voltage into the working voltage of the reset circuit, and output the working voltage of the reset circuit to the communication module; the reset end of the communication module is connected to the output end of the control module, and the communication module resets the reset circuit according to the received working voltage of the reset circuit; the output end of the control module is connected to the control end of the power conversion module, and the control module is used to control the conduction and shutdown of the power conversion module, and control the reset of the reset circuit by the communication module. The utility model controls the conduction and shutdown of the power conversion module through the control module, and controls the reset of the communication module at the same time, thereby realizing the effective reset of the communication module and improving the reliability of the communication module.

[0028] As a further preferred embodiment, the DC power supply module includes a power supply voltage VCC, and the power conversion module includes a first input pin VIN1, and the power supply voltage VCC is connected to the first input pin VIN1. Specifically, in an embodiment of the utility model, the power supply voltage VCC of the DC power supply module provides an analog voltage, and the analog voltage is input into the first input pin VIN1 of the power conversion module.

[0029] As a further preferred embodiment, the power conversion module further includes a first output pin OUT1, the communication module includes a second input pin VIN2, and the first output pin OUT1 is connected to the second input pin VIN2. Specifically, in an embodiment of the utility model, the power conversion module converts the analog voltage into the working voltage of the reset circuit, and inputs the working voltage of the reset circuit into the second input pin VIN2 of the communication module.

[0030] As a further preferred embodiment, the control module includes a signal control unit, the power conversion module also includes an enable control pin EN, and the communication module also includes a reset interface unit RESET; the signal control unit is connected to the enable control pin EN and the reset interface unit RESET respectively. Specifically, in an embodiment of the utility model, the signal control unit is connected to the enable control pin EN and the reset interface unit RESET respectively, which can control the on and off of the power conversion module and the reset of the communication module, so as to achieve effective reset of the communication module.

[0031] As a further preferred embodiment, the reset circuit further includes a discharge module, which is connected to the power conversion module and the control module respectively, and is used to discharge the residual charge of the communication module after power is cut off. In the actual application of the communication module of the electric energy meter, after the power switch is disconnected, if the power switch is reconnected, the communication module needs to be powered on again without completely losing power, which may cause the circuit to fail to resume normal startup. Therefore, the utility model adds a discharge module to the reset circuit, and after the power is cut off, the residual charge in the communication module after power is cut off is discharged to ensure that the communication module can be effectively reset when an abnormality occurs.

[0032] As a further preferred embodiment, the discharge module includes a first resistor R1 and a transistor Q1, one end of the first resistor R1 is connected to the first output pin OUT1, and the other end of the first resistor R1 is connected to the emitter of the transistor Q1. Specifically, in the embodiment of the utility model, when the signal control unit controls the signal input to be high level, the chip in the power conversion module is in a working state, the transistor Q1 is in a turned-off state, and the reset pin of the reset interface unit RESET is high level. At this time, the communication module works normally. When the signal control unit controls the input signal from a high level signal to a low level signal, the chip in the power conversion module is in a turned-off state, the transistor Q1 is in a conducting state, and the communication module is in an abnormal working state.

[0033] As a further preferred embodiment, the discharge module further includes a second resistor R2 and a third resistor R3, one end of the second resistor R2 is connected to the enable control pin EN and the base of the transistor respectively, the other end of the second resistor R2 is connected to the third resistor R3, one end of the third resistor R3 is connected to the enable control pin EN and the second resistor R2 respectively, and the other end of the third resistor R3 is grounded. Specifically, in the embodiment of the utility model, the power conversion module is required to supply power to both the discharge module and the communication module. When the chip in the power conversion module is not working, the power supply voltage VCC cannot continuously provide power to the power conversion module, and the working voltage VDD of the reset circuit in the power conversion module will drop from instantaneous to 0V, thereby achieving the purpose of powering off the communication module. When the reset pin of the reset interface unit RESET is a low-level signal, the communication module can achieve effective reset inside, thereby effectively reducing the product repair rate and further improving the product reliability.

[0034] As a further preferred embodiment, the control module further comprises a main control chip, and the main control chip is used to send a control signal MODL_RESET to the signal control unit. In the embodiment of the utility model, the main control chip of the smart meter sends a control signal MODL_RESET to control the reset pins of the power conversion module, the discharge module and the communication module to achieve effective reset of the communication module.

[0035] As a further preferred embodiment, the transistor is a PNP transistor. In the embodiment of the utility model, the transistor is a PNP transistor.

[0036] Based on the above reset circuit for a smart meter, an embodiment of the present application further provides an electronic device, which includes a device body and a reset circuit for a smart meter as described above, which is arranged in the device body.

[0037] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, 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.

[0038] The above embodiments only express the preferred implementation of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A reset circuit for a smart meter, characterized in that: include: DC power supply module, power conversion module, communication module and control module; The output end of the DC power supply module is connected to the input end of the power conversion module, and the DC power supply module is used to provide an analog voltage to the reset circuit and output the analog voltage to the power conversion module; The output end of the power conversion module is connected to the input end of the communication module, and the power conversion module is used to convert the analog voltage into the working voltage of the reset circuit, and output the working voltage of the reset circuit to the communication module; The reset end of the communication module is connected to the output end of the control module, and the communication module resets the reset circuit according to the working voltage of the reset circuit received; The output end of the control module is connected to the control end of the power conversion module. The control module is used to control the on and off of the power conversion module and control the communication module to reset the reset circuit.

2. The reset circuit for a smart meter according to claim 1, characterized in that: The DC power supply module includes a supply voltage, and the power conversion module includes a first input pin, and the supply voltage is connected to the first input pin.

3. The reset circuit for a smart meter according to claim 2, characterized in that: The power conversion module further includes a first output pin, the communication module includes a second input pin, and the first output pin is connected to the second input pin.

4. The reset circuit for a smart meter according to claim 3, characterized in that: The control module includes a signal control unit, the power conversion module also includes an enable control pin, and the communication module also includes a reset interface unit; The signal control unit is connected to the enable control pin and the reset interface unit respectively.

5. The reset circuit for a smart meter according to claim 4, characterized in that: The reset circuit further includes a discharge module, which is connected to the power conversion module and the control module respectively, and is used to discharge residual charge after the communication module is powered off.

6. The reset circuit for a smart meter according to claim 5, characterized in that: The discharge module includes a first resistor and a transistor, one end of the first resistor is connected to the first output pin, and the other end of the first resistor is connected to the emitter of the transistor.

7. The reset circuit for a smart meter according to claim 6, characterized in that: The discharge module also includes a second resistor and a third resistor, one end of the second resistor is respectively connected to the enable control pin and the base of the transistor, the other end of the second resistor is connected to the third resistor, one end of the third resistor is respectively connected to the enable control pin and the second resistor, and the other end of the third resistor is grounded.

8. The reset circuit for a smart meter according to claim 7, characterized in that: The control module also includes a main control chip, and the main control chip is used to send a control signal to the signal control unit.

9. The reset circuit for a smart meter according to claim 7, characterized in that: The transistor is a PNP transistor.

10. An electronic device, characterized in that: The invention comprises a device body and a reset circuit for a smart meter as claimed in any one of claims 1 to 9 arranged on the device body.

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