A three-phase meter uncapping detection circuit

Abstract

The utility model discloses a three -phase meter uncovers and detects circuitry including: clock power supply circuit, low -power consumption power supply circuit, travel switch circuit and main control MCU, the main control MCU is connected with clock power supply circuit, travel switch circuit and low -power consumption power supply circuit electrically respectively, travel switch circuit is connected with clock power supply circuit and low -power consumption power supply circuit electrically respectively, low -power consumption power supply circuit is connected with clock power supply circuit. The utility model solves how under the situation of three -phase meter power -off state and replaceable battery undervoltage or be taken off, detects the technical problem that the meter opens or closes the lid event and records.

Description

Technical Field

[0001] This utility model relates to the field of meter technology, and in particular to a three-phase meter cover opening detection circuit. Background Technology

[0002] Currently, electricity meters sold in the State Grid market have replaceable backup batteries that power the MCU for low-power operation, supporting functions such as button display and cover opening detection. Additionally, there are non-replaceable clock batteries or supercapacitors that maintain the RTC's normal operation when the backup battery is low on voltage or needs replacement. The State Grid has now updated its technical specifications, requiring that electricity meters record cover opening events even after a power outage (two days later) when the meter cover is opened due to a low-voltage or removed replacement battery. However, existing circuitry cannot support button display and cover opening detection functions using clock batteries or supercapacitors. Therefore, it is not possible to ensure that the MCU promptly wakes up and records the cover opening event when the meter is opened during a power outage and when the replacement battery is low on voltage or removed. Thus, there is an urgent need for a three-phase meter cover opening detection circuit to solve the technical problem of detecting and recording cover opening or closing events in the event of a power outage and when the replacement battery is low on voltage or removed. Utility Model Content

[0003] The main purpose of this utility model is to propose a three-phase meter cover opening detection circuit, which aims to solve the technical problem of how to detect and record meter cover opening or closing events when the three-phase meter is in a power outage state or when the replaceable battery is undervoltage or removed.

[0004] To achieve the above objectives, this utility model provides a three-phase meter cover opening detection circuit, wherein the three-phase meter cover opening detection circuit includes: a clock power supply circuit, a low-power power supply circuit, a limit switch circuit, and a main control MCU; the main control MCU is electrically connected to the clock power supply circuit, the limit switch circuit, and the low-power power supply circuit respectively, the limit switch circuit is electrically connected to the clock power supply circuit and the low-power power supply circuit respectively, and the low-power power supply circuit is connected to the clock power supply circuit.

[0005] In one preferred embodiment, the clock power supply circuit includes a clock battery BT1, a resistor R1, a diode D3, a diode D4, a resistor R4, and a capacitor C3; the positive terminal of the clock battery BT1 is connected to the resistor R1, the other end of the resistor R1 is connected to the anode of the diode D3, the cathode of the diode D3 is connected to the cathode of the diode D4, the limit switch circuit, the resistor R4, and the clock power supply PRTC, the anode of the diode D4 is connected to the low-power power supply VBB, the other end of the resistor R4 is connected to the capacitor C3 and the main control MCU; the negative terminal of the clock battery BT1 and the other end of the capacitor C3 are grounded.

[0006] In one preferred embodiment, the low-power power supply circuit includes a three-terminal regulator VR1, a capacitor C1, and a capacitor C2.

[0007] Pin 1 of the three-terminal regulator VR1 is connected to capacitor C1, backup power supply VBB_IN and limit switch circuit respectively. Pin 3 of the three-terminal regulator VR1 is connected to capacitor C2, low power supply VBB, limit switch circuit, clock power supply circuit and main control MCU respectively. Pin 2 of the three-terminal regulator VR1, the other end of capacitor C1 and capacitor C2 are grounded.

[0008] In one preferred embodiment, the limit switch circuit includes a diode D5, a resistor R5, a capacitor C4, and a limit switch K1; pin 1 of the limit switch K1 is connected to the anode of the diode D5, the cathode of the diode D5 is connected to the backup power supply VBB_IN and the low-power power supply circuit respectively, pin 2 of the limit switch K1 is connected to the clock power supply circuit, pin 3 of the limit switch K1 is connected to the low-power power supply circuit and the main control MCU respectively, pin 4 of the limit switch K1 is connected to the resistor R5, the capacitor C4 and the main control MCU respectively, and the other ends of the resistor R5 and the capacitor C4 are grounded.

[0009] In one preferred embodiment, the real-time clock power pin VRTC of the main control MCU is connected to the clock power supply circuit, the interrupt port INT of the main control MCU is connected to the limit switch circuit, and the power supply pin VDD of the main control MCU is connected to both the limit switch circuit and the low-power power supply circuit.

[0010] In the above technical solution of this utility model, the three-phase meter cover opening detection circuit includes: a clock power supply circuit, a low-power power supply circuit, a limit switch circuit, and a main control MCU; the main control MCU is electrically connected to the clock power supply circuit, the limit switch circuit, and the low-power power supply circuit respectively; the limit switch circuit is electrically connected to the clock power supply circuit and the low-power power supply circuit respectively; and the low-power power supply circuit is connected to the clock power supply circuit. This utility model solves the technical problem of how to detect and record meter cover opening or closing events in the case of a three-phase meter power outage, or when the replaceable battery is undervoltage or removed. Attached Figure Description

[0011] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0012] Figure 1This is a schematic diagram of a three-phase meter cover opening detection circuit according to an embodiment of the present invention.

[0013] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the implementation methods and with reference to the accompanying drawings. Detailed Implementation

[0014] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0015] It should be noted that all directional indicators (such as up, down, etc.) in the embodiments of this utility model are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0016] Furthermore, in this utility model, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0017] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of a person skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0018] See Figure 1 According to one aspect of this utility model, this utility model provides a three-phase meter cover opening detection circuit, wherein the three-phase meter cover opening detection circuit includes: a clock power supply circuit, a low-power power supply circuit, a limit switch circuit, and a main control MCU; the main control MCU is electrically connected to the clock power supply circuit, the limit switch circuit, and the low-power power supply circuit respectively, the limit switch circuit is electrically connected to the clock power supply circuit and the low-power power supply circuit respectively, and the low-power power supply circuit is connected to the clock power supply circuit.

[0019] Specifically, in this embodiment, the clock power supply circuit includes a clock battery BT1, a resistor R1, a diode D3, a diode D4, a resistor R4, and a capacitor C3; the positive terminal of the clock battery BT1 is connected to the resistor R1, the other end of the resistor R1 is connected to the anode of the diode D3, the cathode of the diode D3 is connected to the cathode of the diode D4, the limit switch circuit, the resistor R4, and the clock power supply PRTC, the anode of the diode D4 is connected to the low-power power supply VBB, and the other end of the resistor R4 is connected to the capacitor C3 and the main control MCU; the negative terminal of the clock battery BT1 and the other end of the capacitor C3 are grounded.

[0020] Specifically, in this embodiment, the low-power power supply circuit includes a three-terminal regulator VR1, a capacitor C1, and a capacitor C2; pin 1 of the three-terminal regulator VR1 is connected to capacitor C1, backup power supply VBB_IN, and limit switch circuit, respectively; pin 3 of the three-terminal regulator VR1 is connected to capacitor C2, low-power power supply VBB, limit switch circuit, clock power supply circuit, and main control MCU, respectively; pin 2 of the three-terminal regulator VR1, and the other ends of capacitors C1 and C2 are grounded.

[0021] Specifically, in this embodiment, the limit switch circuit includes a diode D5, a resistor R5, a capacitor C4, and a limit switch K1. Pin 1 of the limit switch K1 is connected to the anode of the diode D5, the cathode of the diode D5 is connected to the backup power supply VBB_IN and the low-power power supply circuit, pin 2 of the limit switch K1 is connected to the clock power supply circuit, pin 3 of the limit switch K1 is connected to the low-power power supply circuit and the main control MCU, and pin 4 of the limit switch K1 is connected to the resistor R5, the capacitor C4, and the main control MCU. The other ends of the resistor R5 and the capacitor C4 are grounded. Pins 1 and 2 of the limit switch are the first set of contacts, and pins 3 and 4 of the limit switch are the second set of contacts. When the button of the limit switch K1 is pressed, both sets of contacts inside it open simultaneously, and when the button of the limit switch K1 is released, both sets of contacts inside it close simultaneously.

[0022] Specifically, in this embodiment, the real-time clock power pin VRTC of the main control MCU is connected to the clock power circuit, the interrupt port INT of the main control MCU is connected to the limit switch circuit, the cover opening detection output CHK of the limit switch K1 is detected, and the power pin VDD of the main control MCU is connected to the limit switch circuit and the low-power power supply circuit respectively.

[0023] Specifically, in this embodiment, the three-phase meter cover opening detection circuit enables the meter to detect cover opening even when it is in a power outage state and the replaceable backup battery is low on voltage or removed. If this occurs, the button on limit switch K1 pops up, and both sets of contacts of limit switch K1 close simultaneously. The clock power supply PRTC is connected to the backup power supply VBB_IN via the first set of contacts of limit switch K1 and diode D5. The clock power supply PRTC supplies power to the backup power supply VBB_IN, which then supplies power to the low-power power supply VBB through the low-power power supply circuit, allowing the main control MCU to be powered on and restart. The circuit detects the closing state of the second set of contacts of limit switch K1, thus detecting cover opening. The system records the status and events. If a lid-closing event occurs, the button of limit switch K1 is pressed, and both sets of contacts of limit switch K1 open simultaneously. The first set of contacts of limit switch K1 disconnects the circuit between the clock power supply PRTC and the backup power supply VBB_IN. The clock power supply PRTC stops supplying power to the backup power supply VBB_IN, which is equivalent to stopping the supply of power to the low-power power supply VBB. However, the main control MCU will not stop running immediately because the remaining charge stored in capacitor C2 supports the MCU to continue running for a period of time. During this period, the main control MCU can detect the open state of the second set of contacts of limit switch K1, thereby detecting the lid-closing state and recording the event. In the lid-closing state, only the real-time clock of the main control MCU is powered. This invention does not require the addition of additional energy storage devices or the increase of the capacity of the original energy storage devices, and does not affect the discharge test of the original energy storage devices.

[0024] The above are merely preferred embodiments of this utility model and do not limit the patent scope of this utility model. Any equivalent structural transformations made based on the inventive concept of this utility model and the contents of this utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this utility model.

Claims

1. A three-phase meter cover opening detection circuit, characterized in that, include: The system includes a clock power supply circuit, a low-power power supply circuit, a limit switch circuit, and a main control MCU. The main control MCU is electrically connected to the clock power supply circuit, the limit switch circuit, and the low-power power supply circuit, respectively. The limit switch circuit is electrically connected to the clock power supply circuit and the low-power power supply circuit, respectively. The low-power power supply circuit is connected to the clock power supply circuit.

2. The three-phase meter cover opening detection circuit according to claim 1, characterized in that, The clock power supply circuit includes a clock battery BT1, a resistor R1, a diode D3, a diode D4, a resistor R4, and a capacitor C3. The positive terminal of the clock battery BT1 is connected to the resistor R1, and the other end of the resistor R1 is connected to the anode of the diode D3. The cathode of the diode D3 is connected to the cathode of the diode D4, the limit switch circuit, the resistor R4, and the clock power supply PRTC. The anode of the diode D4 is connected to the low-power power supply VBB. The other end of the resistor R4 is connected to the capacitor C3 and the main control MCU. The negative terminal of the clock battery BT1 and the other end of the capacitor C3 are grounded.

3. A three-phase meter cover opening detection circuit according to any one of claims 1-2, characterized in that, The low-power power supply circuit includes a three-terminal voltage regulator VR1, capacitor C1, and capacitor C2. Pin 1 of the three-terminal regulator VR1 is connected to capacitor C1, backup power supply VBB_IN and limit switch circuit respectively. Pin 3 of the three-terminal regulator VR1 is connected to capacitor C2, low power supply VBB, limit switch circuit, clock power supply circuit and main control MCU respectively. Pin 2 of the three-terminal regulator VR1, the other end of capacitor C1 and capacitor C2 are grounded.

4. A three-phase meter cover opening detection circuit according to any one of claims 1-2, characterized in that, The limit switch circuit includes diode D5, resistor R5, capacitor C4, and limit switch K1. Pin 1 of limit switch K1 is connected to the anode of diode D5, the cathode of diode D5 is connected to the backup power supply VBB_IN and the low-power power supply circuit, pin 2 of limit switch K1 is connected to the clock power supply circuit, pin 3 of limit switch K1 is connected to the low-power power supply circuit and the main control MCU, pin 4 of limit switch K1 is connected to resistor R5, capacitor C4 and the main control MCU, and the other ends of resistor R5 and capacitor C4 are grounded.

5. A three-phase meter cover opening detection circuit according to any one of claims 1-2, characterized in that, The real-time clock power pin VRTC of the main control MCU is connected to the clock power circuit, the interrupt port INT of the main control MCU is connected to the limit switch circuit, and the power pin VDD of the main control MCU is connected to both the limit switch circuit and the low-power power supply circuit.

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