Interface compatibility detection circuit for power grid intelligent electric energy meter verification

Abstract

The utility model discloses an interface compatible detection circuit for power grid intelligent electric energy meter verification in the field of electric energy meters, which comprises a horizontal terminal connector J3, the horizontal terminal connector J3 is provided with J3-1, J3-2, J3-3 and J3-4 interfaces, the J3-1 interface of the horizontal terminal connector J3 is connected with a resistor R15 and a resistor R16, the other end of the resistor R15 is grounded, and the other end of the resistor R16 is grounded. The other end of the resistor R16 is connected with the R18 and then is connected with the second interface of the bridge rectifier DRC1, the third interface of the bridge rectifier DRC1 is connected with the R22 and then is connected with the first interface of the optocoupler U6, the second interface of the optocoupler U6 is connected with the first interface of the optocoupler U7, and the second interface of the optocoupler U7 is connected with the fourth interface of the bridge rectifier DRC1. According to the auxiliary terminal of the electric energy meter, signals are transmitted to the error plates through the standard interface, each error plate uses one interface circuit and one detection circuit, and design and wiring are greatly facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of electric energy meter, concretely is an interface compatible detection circuit of intelligent electric energy meter of power grid. BACKGROUND

[0002] The load switch of intelligent electric energy meter is an electrical switch device for cutting off and restoring user load, that is, the execution mechanism for executing the remote tripping and closing command of power grid, and the tripping and closing of electric energy meter must be reliable, and the electric energy meter has corresponding event record to ensure that the interests of power grid and user are not damaged. The load switch of electric energy meter has built-in and external two kinds, and the external load switch has two control modes. One (such as Figure 1 ) is that an AC voltage control signal C is output from auxiliary terminal 14 of electric energy meter, the control signal is led from the phase line of the power supply line of the electric energy meter, the tripping and closing input feedback signal R is connected with auxiliary terminal 16, both signal terminals take the zero line (N) of the power supply line as the signal reference point, and the control and feedback are required to be carried out in the mode of 220V (AC) series 100kΩ. The other (such as Figure 2 ) is that two groups of passive and non-polar control switch signals are output from auxiliary terminals 14, 15 and 16 of electric energy meter, the switch node capacity is AC 250V, 2A, that is, tripping normally open, tripping common, tripping normally closed. If the two control modes are detected by a compatible interface detection circuit of electric energy meter detection device, it is undoubtedly convenient for the design of electric energy meter detection device, and it is not necessary to identify which electric energy meter is detected.

[0003] In the prior art scheme, as shown in Figure 1 and Figure 2 , it is the output port of the two control modes of the external load switch of electric energy meter. The original scheme detects the output signal of electric energy meter by two kinds of interfaces and two kinds of circuits, Figure 1 in which the control signal and feedback signal of auxiliary terminal 14 / 16 of electric energy meter are output, and the detection circuit is as shown in Figure 3As shown, it is the control signal and feedback signal detection circuit of the electric energy meter output. J1-1 is the control signal C, J1-2 is the feedback signal R, and the electric energy meter requires control and feedback in the form of 220V (AC) in series with 100kΩ. J2 is the zero line of the electric energy meter. The control signal AC220V of the electric energy meter is connected in series with a 100K resistor output, the signal is rectified through the bridge DRC1, filtered into a DC voltage through C1 and C2, and then flows through the load R6. An isolation optocoupler is connected in parallel with R6, and the signal change can be detected on R8. When the control signal of the electric energy meter has no output, the optocoupler is cut off and does not work, and R8 outputs 3.3V high level through the pull-up resistor; for single-chip microcomputer detection. When the control signal of the electric energy meter has an output, the optocoupler works and is turned on, R8 is pulled to the ground, and 0V is output for single-chip microcomputer detection. The feedback signal of the electric energy meter is directly fed back to the electric energy meter by the output signal of the electric energy meter in series with R1, for the electric energy meter to detect itself.

[0004] Figure 2 Is the auxiliary terminal 14 / 15 / 16 output trip common, trip common, trip common, detection circuit as Figure 4 As shown, it is the electric energy meter output trip common detection circuit, connected to J2. When the relay acts, the trip common and the trip common are short-circuited, the optocoupler is turned on, R11 is pulled to the ground, and 0V is output for single-chip microcomputer detection. When the relay does not act, the trip common and the trip common are disconnected, the optocoupler is cut off, R8 is pulled to 3.3V, and the single-chip microcomputer is detected.

[0005] Because the external load switch of the electric energy meter has two kinds of output control, the electric energy meter detection device has two kinds of detection interfaces and detection circuits. It is inconvenient for design, and if the technician is careless when wiring, the interface will be connected incorrectly, and there will be a risk of burning circuit components.

[0006] Therefore, the person skilled in the art provides an interface compatible detection circuit for smart electric energy meter detection of a power grid to solve the problems in the background art. Practical new type content

[0007] The purpose of the present application is to provide an interface compatible detection circuit for smart electric energy meter detection of a power grid to solve the problems in the background art.

[0008] To achieve the above purpose, the present application provides the following technical scheme:

[0009] The utility model provides an interface compatible detection circuit of smart grid intelligent electric energy meter's detection, including horizontal terminal connector J3, horizontal terminal connector J3 has J3 1, J3 2, J3 3 and J3 4 interface, J3 1 interface of horizontal terminal connector J3 connects resistance R15 and resistance R16, the other end of resistance R15 connects ground after resistance R16, the other end of resistance R16 connects R18 and connects the second interface of bridge rectifier DRC1 after, the third interface of bridge rectifier DRC1 connects R22 and connects the first interface of photocoupler U6 after, the second interface of photocoupler U6 connects the first interface of photocoupler U7, the second interface of photocoupler U7 connects the fourth interface of bridge rectifier DRC1, and the connecting circuit between bridge rectifier DRC1 and photocoupler U6 and photocoupler U7 is connected with electrolytic capacitor CES, capacitor C14 and the series connection of resistance R21 and light emitting diode LED 4 in parallel, the first interface of bridge rectifier DRC1 connects resistance R19, resistance R17 connects the J3 4 interface of horizontal terminal connector J3 after, the J3 3 interface of horizontal terminal connector J3 connects parallelly connected relay contact K1B and relay contact K1A and connects the circuit between resistance R16 and resistance R18.

[0010] As a further scheme of the utility model: the J3 2 interface of horizontal terminal connector J3 is connected with resistance R200, and light emitting diode LED 5 is connected on resistance R20, and the other end of light emitting diode LED 5 is connected with the second interface of photocoupler U5, and the third interface of photocoupler U5 is connected with the third interface of photocoupler U6 and is connected with ground after, and the fourth interface of photocoupler U5 is connected with the fourth interface of photocoupler U6 and resistance R14 and resistance R23.

[0011] As a further scheme of the utility model: the third interface of relay K1C and triode Q1 is connected on the fourth interface of photocoupler U7, and diode D2 is connected in parallel on one side of relay K1C.

[0012] As a further scheme of the utility model: the first interface of triode Q1 is connected with the third interface of photocoupler U7, and the second interface of triode Q1 is connected with ground.

[0013] As a further scheme of the utility model: the J3 1 interface in horizontal terminal connector J3 is connected with the 14 pin of electric energy meter auxiliary probe (electric energy meter can output control signal AC220V, can output trip normally open) ; the J3 2 interface is connected with the 15 pin of electric energy meter auxiliary probe (electric energy meter output trip common) ; the J3 3 interface is connected with the 16 pin of electric energy meter auxiliary probe (electric energy meter can input feedback signal, can output trip normally open) ; the J3 4 interface is connected with electric energy meter zero line.

[0014] The utility model discloses a basic error and its functional auxiliary terminal detection of electric energy meter. The auxiliary terminal of electric energy meter is through a standard interface and is sent to error board on signal. No matter which control mode output of 14 / 15 / 16, error board all use an interface circuit, all use a detection circuit, have greatly facilitated design and wiring. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the output port one of electric energy meter external load switch control mode of prior art;

[0016] Figure 2 It is the output port two of electric energy meter external load switch control mode of prior art;

[0017] Figure 3 It is prior art Figure 1 Corresponding detection circuit diagram;

[0018] Figure 4 It is prior art Figure 2 Corresponding detection circuit diagram;

[0019] Figure 5 It is the circuit diagram of the utility model;

[0020] Figure 6 It is the utility model Figure 5 The partial close-up view of A site in;

[0021] Figure 7 It is the utility model Figure 5 The partial close-up view of B site in.

[0022] Figure 8 It is the practical application block diagram of electric energy meter detection device in the utility model; CONCRETE IMPLEMENTATION

[0023] Please refer to Figures 5-8An interface compatible detection circuit for smart grid intelligent electric energy meter detection, comprising a horizontal terminal connector J3, the horizontal terminal connector J3 has J3-1, J3-2, J3-3 and J3-4 interfaces, the J3-1 interface of the horizontal terminal connector J3 is connected with a resistor R15 and a resistor R16, the other end of the resistor R15 is connected with ground after a resistor R18, the other end of the resistor R16 is connected with a bridge rectifier DRC1 after a resistor R18, the third interface of the bridge rectifier DRC1 is connected with a resistor R22 and a first interface of an optical coupler U6, the second interface of the optical coupler U6 is connected with a first interface of an optical coupler U7, the second interface of the optical coupler U7 is connected with a fourth interface of the bridge rectifier DRC1, the bridge rectifier DRC1 is connected in parallel with an electrolytic capacitor CES, a capacitor C14, a resistor R21 and a series circuit of a resistor R17 and a light emitting diode LED4 in the connection circuit between the optical coupler U6 and the optical coupler U7, the first interface of the bridge rectifier DRC1 is connected with a resistor R19 and a resistor R17 and then connected with a J3-4 interface of the horizontal terminal connector J3, the J3-3 interface of the horizontal terminal connector J3 is connected with a relay contact K1B and a relay contact K1A in parallel and then connected with a circuit between the resistor R16 and the resistor R18.

[0024] Wherein, the J3-2 interface of the horizontal terminal connector J3 is connected with a resistor R200, the resistor R20 is connected with a light emitting diode LED5, the other end of the light emitting diode LED5 is connected with a second interface of an optical coupler U5, a third interface of the optical coupler U5 is connected with a third interface of an optical coupler U6 and then connected with ground, a fourth interface of the optical coupler U5 is connected with a fourth interface of the optical coupler U6, a resistor R14 and a resistor R23.

[0025] Wherein, the fourth interface of the optical coupler U7 is connected with a relay K1C and a third interface of a triode Q1, one side of the relay K1C is connected with a diode D2 in parallel, the first interface of the triode Q1 is connected with a third interface of the optical coupler U7, and the second interface of the triode Q1 is connected with ground.

[0026] Wherein, the J3-1 interface in the horizontal terminal connector J3 is connected with a 14-pin of an auxiliary probe of the electric energy meter (the electric energy meter may output a control signal AC220V, and may output a trip normally open); the J3-2 interface is connected with a 15-pin of the auxiliary probe of the electric energy meter (the electric energy meter outputs a trip common); the J3-3 interface is connected with a 16-pin of the auxiliary probe of the electric energy meter (the electric energy meter may input a feedback signal, and may output a trip normally open); and the J3-4 interface is connected with a zero line of the electric energy meter.

[0027] The working principle of the utility model is: when the electric energy meter outputs control signal AC220V at its auxiliary probe 14 feet, and inputs feedback signal at 16 feet, AC220V flows in through J3-1 interface, through resistance R16, resistance R18, the second several mouths of bridge rectifier DRC1, the first interface of bridge rectifier DRC1, resistance R19, resistance R17, J3-4 interface and flows back to the electric energy meter zero line, bridge rectifier rectifies AC signal into DC signal, flows through load resistance R21, light emitting diode LED4, resistance R22, two optocouplers U6 and U7, optocoupler U7 is turned on, drives triode Q1, makes relay K1C act, its contact K1A, K1B is closed, the input of feedback signal is obtained from the control signal string R16 of its output, optocoupler U6 is turned on, pulls down resistance R23 to the ground, outputs low level 0V, for single-chip microcomputer detection.

[0028] When the electric energy meter is another output control external load switch, the auxiliary probe 14 feet, 15 feet, 16 feet of the electric energy meter output trip normally open, trip common, trip normally closed signal, bridge rectifier does not work, optocoupler U6 and U7 do not work, relay contact K1A, K1B is disconnected, 5V_GL flows through optocoupler U5, light emitting diode LED5, resistance R20, through the trip normally open and trip common that are closed, namely J3-2 interface, J3-1 interface, flows back to GND_GL, optocoupler U5 is turned on, pulls down resistance R23 to the ground, outputs low level 0V, for single-chip microcomputer detection, when the electric energy meter has no output, the trip normally open and trip common are in the disconnected state, and the line K1B behind the trip common and trip normally closed is also in the disconnected state, optocoupler U5 is also cut off, R23 outputs high level, for single-chip microcomputer detection.

[0029] In the embodiment, the electric energy meter carries out basic error and functional auxiliary terminal detection.The auxiliary terminal of the electric energy meter inputs signal to the error board through a standard interface.The error board uses an interface circuit and a detection circuit regardless of the output of 14 / 15 / 16 in any control mode, which greatly facilitates the design and wiring.

[0030] The above only describes the preferred embodiment of the utility model, but the protection scope of the utility model is not limited to this, any skilled person in the art can make equivalent replacement or change according to the technical scheme and the utility model concept of the utility model within the technical range disclosed by the utility model, which should be covered in the protection scope of the utility model.

Claims

1. An interface compatible detection circuit for smart metering of power grid, comprising a horizontal terminal connector J3, characterized in that: The horizontal terminal connector J3 has J3-1, J3-2, J3-3 and J3-4 interfaces, the J3-1 interface of the horizontal terminal connector J3 is connected with the resistance R15 and the resistance R16, the other end of the resistance R15 is connected with the ground, the other end of the resistance R16 is connected with R18 and then connected with the second interface of the bridge rectifier DRC1, the third interface of the bridge rectifier DRC1 is connected with R22 and then connected with the first interface of the optocoupler U6, the second interface of the optocoupler U6 is connected with the first interface of the optocoupler U7, the second interface of the optocoupler U7 is connected with the fourth interface of the bridge rectifier DRC1, the bridge rectifier DRC1 is connected in parallel with the electrolytic capacitor CES, the capacitor C14, the series circuit of the resistance R21 and the light emitting diode LED4 on the connection circuit between the optocoupler U6 and the optocoupler U7, the first interface of the bridge rectifier DRC1 is connected with the resistance R19, the resistance R17 and then connected with the J3-4 interface of the horizontal terminal connector J3, the J3-3 interface of the horizontal terminal connector J3 is connected with the parallelly connected relay contact K1B and relay contact K1A and then connected with the circuit between the resistance R16 and the resistance R18.

2. The interface compatible detection circuit for smart metering of power grid according to claim 1, characterized in that: The J3-2 interface of the horizontal terminal connector J3 is connected with the resistance R200, the light emitting diode LED5 is connected on the resistance R20, the other end of the light emitting diode LED5 is connected with the second interface of the optocoupler U5, the third interface of the optocoupler U5 is connected with the third interface of the optocoupler U6 and then connected with the ground, the fourth interface of the optocoupler U5 is connected with the fourth interface of the optocoupler U6, the resistance R14 and the resistance R23.

3. The interface compatible detection circuit for smart metering of electrical energy of power grid according to claim 2, characterized in that: The fourth interface of the optocoupler U7 is connected with the relay K1C and the third interface of the triode Q1, one side of the relay K1C is connected in parallel with the diode D2.

4. The interface compatible detection circuit for smart metering of electrical energy of power grid according to claim 3, characterized in that: The first interface of the triode Q1 is connected with the third interface of the optocoupler U7, the second interface of the triode Q1 is connected with the ground.

5. The interface compatible detection circuit for smart metering of electrical energy of power grid of claim 1, wherein: The J3-1 interface in the horizontal terminal connector J3 is connected with the 14th pin of the auxiliary probe of the electric energy meter, the J3-2 interface is connected with the 15th pin of the auxiliary probe of the electric energy meter, the J3-3 interface is connected with the 16th pin of the auxiliary probe of the electric energy meter, and the J3-4 interface is connected with the zero line of the electric energy meter.

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