CN203324372U

CN203324372U - Single-phase electronic keyboard prepayment electric energy meter

Info

Publication number: CN203324372U
Application number: CN2013203530176U
Authority: CN
Inventors: 李春章; 郭永娟
Original assignee: Zhejiang Chint Instrument and Meter Co Ltd
Current assignee: Zhejiang Chint Instrument and Meter Co Ltd
Priority date: 2013-06-18
Filing date: 2013-06-18
Publication date: 2013-12-04
Anticipated expiration: 2023-06-18

Abstract

The utility model provides a single-phase electronic keyboard prepayment electric energy meter which comprises an SOC interface circuit, a power supply circuit and a power failure detection circuit. The power failure detection circuit detects a DC power supply outputted by the power supply circuit. When the power failure detection circuit detects that the DC power supply outputted by the power supply circuit is higher than or equal to a presupposed voltage threshold, the power failure detection circuit outputs a connection signal to the SOC interface circuit so that the SOC interface circuit normally works. When the power failure detection circuit detects that the DC power supply outputted by the power supply circuit is lower than the presupposed voltage threshold, the power failure detection circuit outputs an interruption signal to the SOC interface circuit so that the SOC interface circuit stores power failure data. The power failure detection circuit of the single-phase electronic keyboard prepayment electric energy meter can precisely detect the size of the DC outputted by the power supply circuit so that the reliability of the operation of the single-phase electronic keyboard prepayment electric energy meter is ensured.

Description

A kind of electronic single-phase keyboard prepayment meter

Technical field

The utility model relates to a kind of instrument, and specifically a kind of electronic single-phase keyboard prepayment meter, belong to the electric meter technical field.

Background technology

The prepayment meter used in the market adopts various technology to reach the purpose of recharging and paying, such as Contact Type Ic Card is supplemented with money, non-contact radio frequency cards is supplemented with money, telecommunication is supplemented with money, the mode of more than supplementing with money respectively has shortcoming: Contact Type Ic Card is supplemented with money and IC-card need to be inserted in draw-in groove and could realize the charging business, yet thereby the draw-in groove of Contact Type Ic Card is easily caused supplementing with money by pernicious destruction; Non-contact radio frequency cards is only supplemented with money and radio-frequency card need be put in radio-frequency region and can realize recharging service, although non-contact radio frequency cards is without radio-frequency card is inserted in draw-in groove, but non-contact radio frequency cards is vulnerable to electromagnetic interference (EMI) on every side causes Card Reader to be made mistakes, impact is used; Telecommunication is supplemented with money by telecommunication and is realized recharging service, although this mode avoided draw-in groove easily by pernicious destruction, be subject to the shortcoming of electromagnetic interference (EMI) on every side, but in communication, data transmission may be made mistakes, stability and the reliability of this mode are in urgent need to be improved.The Middle East power consumer is widely used a kind of novel prepayment mode now, management system combines generation one group encryption code by user profile and power purchase information, user oneself carries out prepaid data by the encrypted code of acquisition by the numeric keypad on ammeter and is input in ammeter, ammeter after correct deciphering, obtain prestoring electric weight or the amount of money preserve.This way of paying are supplemented with money because the keyboard that adopts ammeter to carry completes, and are commonly referred to the keyboard prepayment meter.The electricity charge of keyboard prepayment meter pre-payment offer the user with code shape, avoided telecommunication to supplement the problem that middle data transmission may be made mistakes with money on the one hand, need not use on the other hand card to supplement with money, do not needed and external interface on its ammeter, good airproof performance, prevent artificial destruction.But it is not how the keyboard prepayment meter detects the power down of keyboard prepayment meter, also open at present.

The utility model content

The utility model provides a kind of electronic single-phase keyboard prepayment meter.

For solving the problems of the technologies described above, the utility model is achieved through the following technical solutions:

A kind of electronic single-phase keyboard prepayment meter, comprise SOC interface circuit, power circuit and power-fail detection circuit, wherein,

Power circuit, comprise that externally provides a galvanic output terminal;

The SOC interface circuit, comprise a control end, and when described control end receives connection signal, described SOC interface circuit normally moves; When described control end receives look-at-me, described SOC interface circuit is carried out power failure data and is preserved action;

Power-fail detection circuit, comprise an input end and an output terminal, and the input end of described power-fail detection circuit is connected with the output terminal of described power circuit, the direct current provided for receiving described power circuit; The output terminal of described power-fail detection circuit is connected with the control end of described SOC interface circuit; Described power-fail detection circuit detects for real-time the direct current that described power circuit provides, and testing result is sent to the control end of described SOC interface circuit; When described power-fail detection circuit detects described direct current and is greater than or equal to predetermined voltage threshold, described power-fail detection circuit is to described SOC interface circuit output connection signal; When described power-fail detection circuit detects described direct current and is less than described predetermined voltage threshold, described power-fail detection circuit is to described SOC interface circuit output look-at-me.

Described electronic single-phase keyboard prepayment meter, described SOC interface circuit comprises system level chip ATT7035AU and peripheral circuit thereof.

Described electronic single-phase keyboard prepayment meter, described power circuit comprises AC/DC power-switching circuit and system works power circuit, described AC/DC power-switching circuit is for externally providing direct current, and described system works power circuit is for providing the working power of system; Described AC/DC power-switching circuit comprises voltage dependent resistor (VDR) RV1, transformer TC1, diode D23, D24, D25, D26, and described diode D23, D24, D25, D26 form full-bridge rectifier; Described system works power circuit comprises capacitor C 2, C4, C7, C8, C9, polar capacitor C1, C3, power supply voltage stabilizing chip 7805, voltage adjuster XC6214P332PR; Alternating current connects the primary coil of described transformer TC1 by described voltage dependent resistor (VDR) RV1, the secondary coil of described transformer TC1 connects the input end of described full-bridge rectifier, and the output terminal of described full-bridge rectifier provides input signal as the output terminal of described AC/DC power-switching circuit to described power-fail detection circuit; The positive pole of the output terminal of described full-bridge rectifier, described polar capacitor C1 and the IN pin that jointly connects described power supply voltage stabilizing chip 7805 after an end of described capacitor C 2 is connected, common ground after the negative pole of described polar capacitor C1 is connected with the other end of described capacitor C 2; After connecting, the end of the positive pole of described polar capacitor C3, described capacitor C 4, C9 connects the OUT pin of described power supply voltage stabilizing chip 7805 and the Vin pin of described voltage adjuster XC6214P332PR, common ground after the negative pole of described polar capacitor C3 is connected with the other end of described capacitor C 4, C9 simultaneously; The GND pin ground connection of described voltage adjuster XC6214P332PR and described power supply voltage stabilizing chip 7805, an end ground connection after described capacitor C 7, C8 parallel connection, the other end is with the Vout pin that meets described voltage adjuster XC6214P332PR.

Described electronic single-phase keyboard prepayment meter, described power-fail detection circuit comprises resistance R 2, R3, R4, R6, capacitor C 6, triode V1, V3; One end of described resistance R 4 is as the output terminal of the described full-bridge rectifier of input termination of described power-fail detection circuit, one end of the other end of described resistance R 4, described resistance R 6 is connected with an end of described capacitor C 6 and their tie point connects the base stage of described triode V3, common ground after the other end of the emitter of described triode V3, described resistance R 6 is connected with the other end of described capacitor C 6; One end of the collector of described triode V3, described resistance R 3 is connected with the base stage of described triode V1, and the other end of described resistance R 3 is connected with an end of described resistance R 2 and their tie point connects the Vout pin of described voltage adjuster XC6214P332PR; The other end of described resistance R 2 is connected with the collector of described triode V1 and an end of described capacitor C 5, and their tie point connects 3 and 21 pins of described ATT7035AU; Common ground after the emitter of described triode V1 is connected with the other end of described capacitor C 5.

Described electronic single-phase keyboard prepayment meter, also comprise control relay circuit, and described control relay circuit comprises L phase relay control circuit and N phase relay control circuit; Described L phase relay control circuit is identical with described N phase relay control circuit structure, wherein, described L phase relay control circuit and described N phase relay control circuit include triode V4, V5, V8, V9, V12, V13, resistance R 7, R8, R11, R12, R15, R16, R19, R20, R23, R24, R27, R28 and diode D6, D7, D10, D11 and magnetic latching relay;

One end of described resistance R 15 is connected with an end of described resistance R 19 and their tie point connects the base stage of described triode V9, 95 pins of the described ATT7035AU of another termination of described resistance R 15, the other end of described resistance R 19 connects 94 pins of described ATT7035AU simultaneously, one end of the emitter of described triode V9 and described resistance R 23, the other end of described resistance R 23 connects an end of base stage and the described resistance R 27 of described triode V13 simultaneously, the other end of described resistance R 27, common ground after the positive pole of the emitter of described triode V13 and described diode D10 is connected, after being connected, the positive pole of the collector of the collector of the negative pole of described diode D10, described triode V13, described triode V5 and described diode D6 connects an end of described magnetic latching relay drive coil, the collector of described triode V9 connects an end of described resistance R 11, one end of the other end of described resistance R 11 and described resistance R 7 is connected and their tie point connects the base stage of described triode V5, and the other end of the emitter of described triode V5, described resistance R 7 is connected with the negative pole of described diode D6 and their tie point connects the output terminal of described full-bridge rectifier,

One end of described resistance R 16 is connected with an end of described resistance R 20 and their tie point connects the base stage of described triode V8, 94 pins of the described ATT7035AU of another termination of described resistance R 16, the other end of described resistance R 20 connects 95 pins of described ATT7035AU simultaneously, one end of the emitter of described triode V8 and described resistance R 24, the other end of described resistance R 24 connects an end of base stage and the described resistance R 28 of described triode V12 simultaneously, the other end of described resistance R 28, common ground after the positive pole of the emitter of described triode V12 and described diode D11 is connected, after being connected, the positive pole of the collector of the collector of the negative pole of described diode D11, described triode V12, described triode V4 and described diode D7 connects the other end of described magnetic latching relay drive coil, the collector of described triode V8 connects an end of described resistance R 12, after one end of the other end of described resistance R 12, described resistance R 8 connects, their tie point connects the base stage of described triode V4, and the other end of the emitter of described triode V4, described resistance R 8 is connected with the negative pole of described diode D7 afterwards and their tie point connects the output terminal of described full-bridge rectifier.

Described electronic single-phase keyboard prepayment meter, described power circuit also comprises the system power supply commutation circuit of the standby power supply that system works is provided, described system power supply commutation circuit comprises capacitor C 11 and polar capacitor C10 and standby power supply; One end of the positive pole of described polar capacitor C10 and capacitor C 11 is connected and their tie point connects 90 pins and the described standby power supply positive pole of described ATT7035AU, common ground after the negative pole of described polar capacitor C10 is connected with the other end of capacitor C 11; The negative pole of described standby power supply is by J2 and JP-2 ground connection.

Described electronic single-phase keyboard prepayment meter, also comprise communicating circuit, described communicating circuit is the magnetic adsorption type infrared communication circuit, described magnetic adsorption type infrared communication circuit comprises receiving circuit and radiating circuit, described receiving circuit comprises resistance R31, R36, R38, R40 and triode V16 and infrared receiving tube D14, and described radiating circuit comprises resistance R 32, R37, R39 and triode V17 and infrared transmitting tube D15;

The Vout pin that one end connection of the negative pole of described infrared receiving tube D14, described resistance R 31 and their tie point meet described voltage adjuster XC6214P332PR, one end of the positive pole of described infrared receiving tube D14, described resistance R 38 is connected with an end of described resistance R 36, the base stage of the described triode V16 of another termination of described resistance R 36, the other end of the collector of described triode V16, described resistance R 31 is connected with 29 pins of described ATT7035AU; One end of the described resistance R 40 of another termination of described resistance R 38, common ground after the emitter of described triode V16 is connected with the other end of described resistance R 40;

30 pins of the described ATT7035AU of one termination of described resistance R 37, the other end and the base stage that meets described triode V17 after an end of described resistance R 32 is in parallel, the other end of described resistance R 32 and the Vout pin that jointly meets described voltage adjuster XC6214P332PR after the emitter of described triode V17 is connected, the emitter of described triode V17 is connected with the positive pole of described infrared transmitting tube D15 by described resistance R 39, the minus earth of described infrared transmitting tube D15.

Described electronic single-phase keyboard prepayment meter, also comprise keyboard circuit, described keyboard circuit comprises resistance R 61, R62, R63, R65, R66, R69, R72, R73, R74, R75, capacitor C 43, C44, C45, C46, C47, C48, C49 and carbon Key Pad KEY1, KEY2, KEY3, KEY4, KEY5, KEY6, KEY7 and chip XHC3-7A;

1 pin of described chip XHC3-7A is the end with described resistance R 61 by described resistance R 65, after connecting, one end of described capacitor C 43 jointly meets described carbon Key Pad KEY1,2 pins of described chip XHC3-7A are the end with described resistance R 62 by described resistance R 66, after connecting, one end of described capacitor C 44 jointly meets described carbon Key Pad KEY2, after being connected, one end of the end of 3 pins of described chip XHC3-7A by described resistance R 69 and described resistance R 63 and described capacitor C 45 jointly meets described carbon Key Pad KEY3,4 pins of described chip XHC3-7A by described resistance R 72 with jointly meet described carbon Key Pad KEY4 after an end of described capacitor C 46 is connected, 5 pins of described chip XHC3-7A by described resistance R 73 with jointly meet described carbon Key Pad KEY5 after an end of described capacitor C 47 is connected, 6 pins of described chip XHC3-7A by described resistance R 74 with jointly meet described carbon Key Pad KEY6 after an end of described capacitor C 48 is connected, 7 pins of described chip XHC3-7A by described resistance R 75 with jointly meet described carbon Key Pad KEY7 after an end of described capacitor C 49 is connected, the other end of the other end of described resistance R 61, described resistance R 62 and the Vout pin that jointly meets described voltage adjuster XC6214P332PR after the other end of described resistance R 63 is connected, common ground after the other end of the other end of described C43, the other end of described C44, the other end of described C45, the other end of described C46, the other end of described C47, described C48 is connected with the other end of described C49.

Described electronic single-phase keyboard prepayment meter, also comprise alternating current sampling circuit, described alternating current sampling circuit comprises current sampling circuit and voltage sampling circuit, described current sampling circuit comprises resistance R 42, R43, R44, R45, R46, R47, R48, R49, R50, R51, capacitor C 19, C20; Described voltage sampling circuit comprises resistance R 52, R53, R56, R58, R59, R60, R88, R89, R90, capacitor C 22, C23, C31, C33;

An end ground connection after described resistance R 50 is in parallel with described

capacitor C

19,8 pins of the described ATT7035AU of another termination, connect the N line by described resistance R 42, R43, R44, R45, R46, R47, R48, R49 simultaneously, an end ground connection after described resistance R 51 is in parallel with described

capacitor C

20,9 pins of the described ATT7035AU of another termination;

One end of described resistance R 56 is connected with an end of described resistance R 58 and their sampling end of the second current transformer of link connecting to neutral line current sampling use, ground connection after the other end of described resistance R 58 is connected with an end of described resistance R 59, the other end of described resistance R 59 is connected with an end of described resistance R 60 and their reference edge of the second current transformer of link connecting to neutral line current sampling use, connect 11 pins of described chip ATT7035AU after one end link of the other end of described resistance R 60 and described capacitor C 33, ground connection after the other end of described capacitor C 33 is connected with an end of described capacitor C 31, the other end of described

capacitor C

31 and 10 pins that meet described chip ATT7035AU after the other end of described resistance R 56 is connected,

One end of described resistance R 52 is connected with an end of described resistance R 88 and their link connects the sampling end of the first current transformer of an end of described resistance R 89 and neutral line current sampling use simultaneously, ground connection after the other end of described resistance R 88 is connected with an end of described resistance R 90, the other end of described resistance R 90 is connected with an end of described resistance R 53 and their link connects the reference edge of the first current transformer of the other end of described resistance R 89 and neutral line current sampling use simultaneously, the other end of described resistance R 53 is connected 13 pins of the described chip ATT7035AU of termination with an end of described capacitor C 23, ground connection after the other end of described capacitor C 23 is connected with an end of described capacitor C 22, the other end of described

capacitor C

22 and 12 pins that meet described ATT7035AU after the other end of described resistance R 52 is connected.

Described electronic single-phase keyboard prepayment meter, also comprise strong magnetic sensor circuit, backlight screen control circuit, buzzer alarm circuit, table cover and end button cover open detection circuit, meritorious impulse output circuit and second merit impulse output circuit;

Described strong magnetic sensor circuit comprises chip PT3661, capacitor C 39, C41, resistance R 64, the OUT pin of described chip PT3661, an end of described resistance R 64 and jointly connect 86 pins of described ATT7035AU after an end of described capacitor C 41 is connected, one end of the other end of described resistance R 64, described capacitor C 39 and the Vout pin that jointly meets described voltage adjuster XC6214P332PR after the VDD pin of described chip PT3661 is connected, common ground after the other end of the other end of described capacitor C 39, described capacitor C 41 is connected with the GND pin of described chip PT3661;

Described backlight screen control circuit comprises triode V19, V20, V21, resistance R 77, R78, R79, R83, R84, R85, capacitor C 50, C51, C52, C53, light emitting diode D0, D18, D19, D20, the Vout pin of the described voltage adjuster XC6214P332PR of one termination of described resistance R 83, the other end of described resistance R 83 connects the positive pole of described light emitting diode D19 and an end of described capacitor C 51 simultaneously, the negative pole of described light emitting diode D19 and 56 pins that jointly meet described ATT7035AU after the other end of described capacitor C 51 is connected, 28 pins of the described ATT7035AU of one termination of described resistance R 78, the base stage of the described triode V19 of the other end of described resistance R 78, the emitter of described triode V19 connects the Vout pin of described voltage adjuster XC6214P332PR, the collector of described triode V19 connects an end of described resistance R 82, the other end of described resistance R 82 connects an end of described capacitor C 50 and the positive pole of described light emitting diode D18 simultaneously, common ground after the other end of described capacitor C 50 is connected with the negative pole of described light emitting diode D18, 55 pins of the described ATT7035AU of one termination of described resistance R 79, the base stage of the described triode V21 of the other end of described resistance R 79, the collector of described triode V21 connects an end of described resistance R 85, and the other end of described resistance R 85 connects an end of described capacitor C 53, the positive pole of described light emitting diode D20 simultaneously, 54 pins of the described ATT7035AU of one termination of described resistance R 77, the base stage of the described triode V20 of the other end of described resistance R 77, the emitter of described triode V20 and the Vout pin that meets described voltage adjuster XC6214P332PR after the emitter of described triode V21 is connected, the collector of described triode V20 connects an end of described resistance R 84, the other end of described resistance R 84 connects an end of described capacitor C 52 and the positive pole of described light emitting diode D0 simultaneously, the other end of described capacitor C 52, the negative pole of described light emitting diode D0, common ground after the other end of described capacitor C 53 is connected with the negative pole of described light emitting diode D20,

Described buzzer alarm circuit comprises resistance R 80, R81, R86, capacitor C 54, diode D17, triode V22, hummer M1, 22 pins of the described ATT7035AU of one termination of described resistance R 86, the other end of described resistance R 86, after connecting, one end of described capacitor C 54 connects the base stage of described triode V22, common ground after the other end of described capacitor C 54 is connected with the collector of described triode V22, the emitter of described triode V22 connects the positive pole of described diode D17 and the end of described hummer M1 simultaneously, the negative pole of described diode D17, one end of the other end of described hummer M1 and described resistance R 80 is connected with an end of described resistance R 81, the other end of described resistance R 80 and the Vout pin that jointly meets described voltage adjuster XC6214P332PR after the other end of described resistance R 81 is connected,

Described table cover and end button cover open detection circuit comprise resistance R 70, R71, capacitor C 40, C42, button S1, S2; Common ground after one end of one end of described resistance R 70, an end of described resistance R 70, described capacitor C 40 is connected with an end of described capacitor C 42, the other end of the other end of described resistance R 70, described

capacitor C

40 and 4 pins that jointly meet described ATT7035AU after 2 pins of described button S1 are connected, the other end of the other end of described resistance R 71, described

capacitor C

42 and 5 pins that jointly meet described ATT7035AU after 2 pins of described button S2 are connected, 1 pin of described button S1 and 92 pins that jointly meet described ATT7035AU after 1 pin of described button S2 is connected;

Described meritorious impulse output circuit comprises the first photoelectrical coupler TLP785, resistance R 67, R68, R76, triode V18, diode D21, light emitting diode D16, capacitor C 38; 33 pins of the described ATT7035AU of one termination of described resistance R 76, the base stage of the described triode V18 of another termination of described resistance R 76, the grounded emitter of described triode V18, the collector of described triode V18 connects an end of described resistance R 67 and an end of described resistance R 68 simultaneously, the input end of the described first photoelectrical coupler TLP785 of another termination of described resistance R 68, the other end of described resistance R 67 connects an end of described capacitor C 38 and the negative pole of described light emitting diode D16 simultaneously, the other end of described capacitor C 38, the positive pole of described light emitting diode D16 and the Vout pin that jointly meets described voltage adjuster XC6214P332PR after another input end of described the first photoelectrical coupler TLP785 is connected, output terminal of described the first photoelectrical coupler TLP785 with jointly connect the meritorious pulse output of auxiliary terminal sampling end after described diode D21 negative pole is connected, another output terminal of described the first photoelectrical coupler TLP785 connects the meritorious pulse output of auxiliary terminal reference edge jointly after being connected with described diode D1 is anodal,

Within described second, the merit impulse output circuit comprises the second photoelectrical coupler TLP785, resistance R 91, R54, triode V23, diode D22, 21 pins of the described ATT7035AU of one termination of described resistance R 91, the base stage of the described triode V23 of another termination, the grounded emitter of described triode V23, the collector of described triode V23 connects an end of described resistance R 54, the input end of the described second photoelectrical coupler TLP785 of another termination of described resistance R 54, the Vout pin of the described voltage adjuster XC6214P332PR of another input termination of described the second photoelectrical coupler TLP785, output terminal of described the second photoelectrical coupler TLP785 with jointly connect auxiliary terminal pulse per second (PPS) output sampling end after described diode D22 negative pole is connected, another output terminal of described the second photoelectrical coupler TLP785 connects auxiliary terminal pulse per second (PPS) output reference edge after being connected with described diode D22 is anodal jointly.

Described electronic single-phase keyboard prepayment meter, also comprise data storage circuitry, described data storage circuitry comprises storage chip BR24G128FJ-WE2, capacitor C 15, resistance R 34, R35, one end of described capacitor C 15, 8 pins of described storage chip BR24G128FJ-WE2, one end of described

resistance R

34 and 92 pins that jointly meet described ATT7035AU after an end of described resistance R 35 is connected, 6 pins of described storage chip BR24G128FJ-WE2 and 1 pin that jointly meets described ATT7035AU after the other end of described resistance R 34 is connected, 5 pins of described storage chip BR24G128FJ-WE2 and 2 pins that jointly meet described ATT7035AU after the other end of described resistance R 35 is connected, 1 pin of the other end of described capacitor C 15 and described storage chip BR24G128FJ-WE2, 2 pins, 3 pins, 4 pins, common ground after 7 pins connect.

Technique scheme of the present utility model has the following advantages compared to existing technology:

(1) electronic single-phase keyboard prepayment meter described in the utility model, comprise the SOC interface circuit, power circuit and power-fail detection circuit, power-fail detection circuit detects the direct current of power circuit output, when the direct current that power circuit output detected when power-fail detection circuit is greater than or equal to predetermined voltage threshold, described power-fail detection circuit is to described SOC interface circuit output connection signal, described SOC interface circuit normally moves, when the direct current that power circuit output detected when power-fail detection circuit is less than described predetermined voltage threshold, described power-fail detection circuit is to described SOC interface circuit output look-at-me, described SOC interface circuit is carried out power failure data and is preserved action.The electronic single-phase keyboard prepayment meter power-fail detection circuit that the utility model provides can accurately detect power circuit and export galvanic size, guarantees electronic single-phase keyboard prepayment meter reliability of operation.

(2) electronic single-phase keyboard prepayment meter described in the utility model, comprise system level chip ATT7035AU, ATT7035AU is integrated with metering module, clock circuit module, LCD driver module and cpu resource as the SOC system level chip, and integrated level is high.

(3) electronic single-phase keyboard prepayment meter described in the utility model, comprise control relay circuit, controls magnetic latching relay drive coil polarity of voltage and direction of current.

(4) electronic single-phase keyboard prepayment meter described in the utility model, comprise communicating circuit, keyboard circuit, table cover and end button cover open detection circuit, alternating current sampling circuit, strong magnetic sensor circuit, backlight screen control circuit, buzzer alarm circuit, meritorious impulse output circuit, second merit impulse output circuit, data storage circuitry, compared with prior art, integrated level is higher, with low cost, design is succinct reliable, can large-scale production.

The accompanying drawing explanation

For content of the present utility model is more likely to be clearly understood, below in conjunction with accompanying drawing, the utility model is described in further detail, wherein,

Fig. 1 is the structural representation of electronic single-phase keyboard prepayment meter described in the utility model;

Fig. 2 is ATT7035AU and the interface schema of electronic single-phase keyboard prepayment meter described in the utility model;

Fig. 3 is the power circuit diagram of electronic single-phase keyboard prepayment meter described in the utility model;

Fig. 4 is the system power supply commutation circuit figure of electronic single-phase keyboard prepayment meter described in the utility model;

Fig. 5 is the power-fail detection circuit figure of electronic single-phase keyboard prepayment meter described in the utility model;

Fig. 6 is the control relay circuit figure of electronic single-phase keyboard prepayment meter described in the utility model;

Fig. 7 is the communicating circuit figure of electronic single-phase keyboard prepayment meter described in the utility model;

Fig. 8 is the keyboard circuit figure of electronic single-phase keyboard prepayment meter described in the utility model;

Fig. 9 is the alternating current sampling circuit figure of electronic single-phase keyboard prepayment meter described in the utility model;

Figure 10 is the strong magnetic sensor circuit figure of electronic single-phase keyboard prepayment meter described in the utility model;

Figure 11 is table cover and the end button cover open detection circuit diagram of electronic single-phase keyboard prepayment meter described in the utility model;

Figure 12 is the backlight screen control circuit figure of electronic single-phase keyboard prepayment meter described in the utility model;

Figure 13 is the buzzer alarm circuit figure of electronic single-phase keyboard prepayment meter described in the utility model;

Figure 14 is the meritorious impulse output circuit figure of electronic single-phase keyboard prepayment meter described in the utility model;

Figure 15 is merit impulse output circuit figure second of electronic single-phase keyboard prepayment meter described in the utility model;

Figure 16 is the data storage circuitry figure of electronic single-phase keyboard prepayment meter described in the utility model.

Reference numeral: 1-SOC interface circuit, 2-power circuit, 3-power-fail detection circuit.

Embodiment

Embodiment 1:

As shown in Figure 1, it comprises SOC interface circuit 1, power circuit 2 and power-fail detection circuit 3 to the structure of electronic single-phase keyboard pre-payment electric energy watch circuit described in the utility model, and wherein, power circuit 2 comprises that externally provides a galvanic output terminal; SOC interface circuit 1, comprise a control end, and when described control end receives connection signal, described SOC interface circuit 1 normally moves; When described control end receives look-at-me, described SOC interface circuit 1 is carried out power failure data and is preserved action; Power-fail detection circuit 3, comprise an input end and an output terminal, and the input end of described power-fail detection circuit 3 is connected with the output terminal of described power circuit 2, the direct current provided for receiving described power circuit 2; The output terminal of described power-fail detection circuit 3 is connected with the control end of described SOC interface circuit 1; Described power-fail detection circuit 3 detects for real-time the direct current that described power circuit 2 provides, and testing result is sent to the control end of described SOC interface circuit 1; When described power-fail detection circuit 3 detects described direct current and is greater than or equal to predetermined voltage threshold, described power-fail detection circuit 3 is to described SOC interface circuit 1 output connection signal; When described power-fail detection circuit 3 detects described direct current and is less than described predetermined voltage threshold, described power-fail detection circuit 3 is to described SOC interface circuit 1 output look-at-me.

In the present embodiment, shown in Figure 2, described SOC interface circuit 1 comprises system level chip ATT7035AU, and ATT7035AU is integrated with metering module, clock circuit module, LCD driver module and MCU resource as the SOC system level chip.

In the present embodiment, described power circuit 2 comprises for externally providing galvanic AC/DC power-switching circuit and for the system works power circuit of working power that system is provided; Shown in Figure 3, described AC/DC power-switching circuit comprises voltage dependent resistor (VDR) RV1, transformer TC1, diode D23, D24, D25, D26, and described diode D23, D24, D25, D26 form full-bridge rectifier; Described system works power circuit comprises capacitor C 2, C4, C7, C8, C9, polar capacitor C1, C3, power supply voltage stabilizing chip 7805, voltage adjuster XC6214P332PR.

Alternating current connects the primary coil of described transformer TC1 by described voltage dependent resistor (VDR) RV1, the secondary coil of described transformer TC1 connects the input end of described full-bridge rectifier, and the output terminal of described full-bridge rectifier provides input signal as the output terminal of described AC/DC power-switching circuit to described power-fail detection circuit 3; The positive pole of the output terminal of described full-bridge rectifier, described polar capacitor C1 and the IN pin that jointly connects described power supply voltage stabilizing chip 7805 after an end of described capacitor C 2 is connected, common ground after the negative pole of described polar capacitor C1 is connected with the other end of described capacitor C 2; After connecting, the end of the positive pole of described polar capacitor C3, described capacitor C 4, C9 connects the OUT pin of described power supply voltage stabilizing chip 7805 and the Vin pin of described voltage adjuster XC6214P332PR, common ground after the negative pole of described polar capacitor C3 is connected with the other end of described capacitor C 4, C9 simultaneously; The GND pin ground connection of described voltage adjuster XC6214P332PR and described power supply voltage stabilizing chip 7805, an end ground connection after described capacitor C 7, C8 parallel connection, the Vout pin of the described voltage adjuster XC6214P332PR of another termination, the Vout pin of described voltage adjuster XC6214P332PR is used for providing the working power of system as the output terminal of described system works power circuit.

As other embodiments, described power circuit 2 also comprises the system power supply commutation circuit of the standby power supply that system works is provided, shown in Figure 4, and described system power supply commutation circuit comprises capacitor C 11 and polar capacitor C10 and standby power supply; One end of the positive pole of described polar capacitor C10 and capacitor C 11 is connected and their tie point connects 90 pins and the described standby power supply positive pole of described chip ATT7035AU, common ground after the negative pole of described polar capacitor C10 is connected with the other end of capacitor C 11; The negative pole of described standby power supply is by J2 and JP-2 ground connection.

The low consumption circuit power supply is taken from the 92nd pin of described chip ATT7035AU, described power down low-power dissipation power supply directly is not connected with described standby power supply, described standby power supply positive pole is connected with the 90th pin of described chip ATT7035AU, by described chip ATT7035AU internal electric source commutation circuit, controls.

In the inner integrated power supply commutation circuit of described chip ATT7035AU, can be set to 2.8V to electrical source exchange voltage, 3.0V, 3.2V third gear, take the 3.0V predetermined threshold value as example: while normally using, the Vout pin of the voltage adjuster XC6214P332PR of cpu power VDD3P3 in the system works power circuit provides, after the switched voltage threshold value enables at the register inner setting and by the electrical source exchange function, the system works power supply VSYS voltage provided when the Vout of voltage adjuster XC6214P332PR pin falls when 3.0V is following, chip ATT7035AU implements electrical source exchange automatically in inside, cpu power VDD3P3 is provided by the described standby power supply of described system power supply commutation circuit.

Shown in Figure 5, described power-fail detection circuit 3 comprises resistance R 2, R3, R4, R6, capacitor C 6, triode V1, V3; One end of described resistance R 4 is as the output terminal of the described full-bridge rectifier of input termination of described power-fail detection circuit 3, one end of the other end of described resistance R 4, described resistance R 6 is connected with an end of described capacitor C 6 and their tie point connects the base stage of described triode V3, common ground after the other end of the emitter of described triode V3, described resistance R 6 is connected with the other end of described capacitor C 6; One end of the collector of described triode V3, described resistance R 3 is connected with the base stage of described triode V1, and the other end of described resistance R 3 is connected with an end of described resistance R 2 and their tie point connects the Vout pin of described voltage adjuster XC6214P332PR; The other end of described resistance R 2 is connected with the collector of described triode V1 and an end of described capacitor C 5, and their tie point connects 3 and 21 pins of described ATT7035AU; Common ground after the emitter of described triode V1 is connected with the other end of described capacitor C 5.

The voltage of the output terminal out-put supply of described full-bridge rectifier after described resistance R 4, R6 dividing potential drop as the input signal of described triode V3.When the output supply voltage of described full-bridge rectifier during higher than 7V, described triode V3 conducting, described triode V1 cut-off, 3 pins of described chip ATT7035AU obtain the connection signal of digital logic high levels, and normally power on running status; When the output supply voltage of described full-bridge rectifier during lower than 7V, described triode V3 cut-off, described triode V1 conducting, 3 pins of described chip ATT7035AU obtain the look-at-me of digital logic low levels, described chip ATT7035AU thinks the civil power power down, now system can also maintain the certain hour normal operation, starts to carry out the front related data of power down and preserves, and then the waiting system electrical source exchange enters low power consumpting state.

Embodiment 2:

On the basis of above-described embodiment, also comprise control relay circuit, described control relay circuit comprises L phase relay control circuit and N phase relay control circuit; Described L phase relay control circuit is identical with described N phase relay control circuit structure, shown in Figure 6, described L phase relay control circuit and described N phase relay control circuit include triode V4, V5, V8, V9, V12, V13, resistance R 7, R8, R11, R12, R15, R16, R19, R20, R23, R24, R27, R28 and diode D6, D7, D10, D11 and magnetic latching relay;

Above-mentioned control relay circuit forms relay and drives and interlock protection.In control relay circuit, L line relay drive principle is identical with N line relay drive principle, and the L line relay drive principle of take is example: triode V4, V5, V12, V13 form the H bridge and control magnetic latching relay drive coil polarity of voltage and direction of current.When 94 pin, 95 pin of described chip ATT7035AU are exported digital logic high levels simultaneously or are exported the digital logic low levels signal simultaneously, magnetic latching relay drive coil two ends reference voltage is close to zero, do not have electric current to flow through from the magnetic latching relay drive coil, magnetic latching relay is failure to actuate; The 94 pin output digital logic low levels as described chip ATT7035AU, the 95 pin output digital logic high levels of described chip ATT7035AU, and hold time more than 120ms, there are forward voltage and forward current in the JDQ1A of magnetic latching relay drive coil, JDQ1B two ends during this period, and the tripping operation action can occur magnetic latching relay; The 94 pin output digital logic high levels as described chip ATT7035AU, the 95 pin output digital logic low levels of described chip ATT7035AU, and hold time more than 120ms, there are reverse voltage and inverse current in the JDQ1A of magnetic latching relay drive coil, JDQ1B two ends during this period, and feed motion can occur magnetic latching relay.

Embodiment 3:

On the basis of

embodiment

1,2, also comprise communicating circuit, described communicating circuit is the magnetic adsorption type infrared communication circuit, shown in Figure 7, described magnetic adsorption type infrared communication circuit comprises receiving circuit and radiating circuit, described receiving circuit comprises resistance R31, R36, R38, R40 and triode V16 and infrared receiving tube D14, and described radiating circuit comprises resistance R 32, R37, R39 and triode V17 and infrared transmitting tube D15.

The Vout pin that one end connection of the negative pole of described infrared receiving tube D14, described resistance R 31 and their tie point meet described voltage adjuster XC6214P332PR, one end of the positive pole of described infrared receiving tube D14, described resistance R 38 is connected with an end of described resistance R 36, the base stage of the described triode V16 of another termination of described resistance R 36, the other end of the collector of described triode V16, described resistance R 31 is connected with 29 pins of described chip ATT7035AU; One end of the described resistance R 40 of another termination of described resistance R 38, common ground after the emitter of described triode V16 is connected with the other end of described resistance R 40; 30 pins of the described ATT7035AU of one termination of described resistance R 37, the other end and the base stage that meets described triode V17 after an end of described resistance R 32 is in parallel, the other end of described resistance R 32 and the Vout pin that jointly meets described voltage adjuster XC6214P332PR after the emitter of described triode V17 is connected, the emitter of described triode V17 is connected with the positive pole of described infrared transmitting tube D15 by described resistance R 39, the minus earth of described infrared transmitting tube D15.

Embodiment 4:

On the basis of above-described embodiment, also comprise keyboard circuit, shown in Figure 8, described keyboard circuit comprises resistance R 61, R62, R63, R65, R66, R69, R72, R73, R74, R75, capacitor C 43, C44, C45, C46, C47, C48, C49 and carbon Key Pad KEY1, KEY2, KEY3, KEY4, KEY5, KEY6, KEY7 and chip XHC3-7A.

Embodiment 5:

On the basis of above-described embodiment, also comprise alternating current sampling circuit, shown in Figure 9, described alternating current sampling circuit comprises current sampling circuit and voltage sampling circuit, described current sampling circuit comprises resistance R 42, R43, R44, R45, R46, R47, R48, R49, R50, R51, capacitor C 19, C20; Described voltage sampling circuit comprises resistance R 52, R53, R56, R58, R59, R60, R88, R89, R90, capacitor C 22, C23, C31, C33.

capacitor C

20,9 pins of the described ATT7035AU of another termination.

capacitor C

31 and 10 pins that meet described chip ATT7035AU after the other end of described resistance R 56 is connected.

capacitor C

Embodiment 6:

On the basis of above-described embodiment, also comprise strong magnetic sensor circuit, shown in Figure 10, described strong magnetic sensor circuit comprises chip PT3661, capacitor C 39, C41, resistance R 64, the OUT pin of described chip PT3661, one end of described resistance R 64 and 86 pins that jointly meet described chip ATT7035AU after an end of described capacitor C 41 is connected, the other end of described resistance R 64, one end of described capacitor C 39 and the Vout pin that jointly meets described voltage adjuster XC6214P332PR after the VDD pin of described chip PT3661 is connected, the other end of described capacitor C 39, common ground after the other end of described capacitor C 41 is connected with the GND pin of described chip PT3661.

Embodiment 7:

On the basis of above-described embodiment, also comprise table cover and end button cover open detection circuit, shown in Figure 11, described table cover and end button cover open detection circuit comprise resistance R 70, R71, capacitor C 40, C42, button S1, S2; Common ground after one end of described resistance R 70, an end of described capacitor C 40 are connected with an end of described capacitor C 42, the other end of the other end of described resistance R 70, described

capacitor C

42 and 5 pins that jointly meet described ATT7035AU after 2 pins of described button S2 are connected, 1 pin of described button S1 and 92 pins that jointly meet described ATT7035AU after 1 pin of described button S2 is connected.

Embodiment 8:

On the basis of above-described embodiment, also comprise the backlight screen control circuit, shown in Figure 12, described backlight screen control circuit comprises triode V19, V20, V21, resistance R 77, R78, R79, R83, R84, R85, capacitor C 50, C51, C52, C53, light emitting diode D0, D18, D19, D20.

The Vout pin of the described voltage adjuster XC6214P332PR of one termination of described resistance R 83, the other end of described resistance R 83 connects the positive pole of described light emitting diode D19 and an end of described capacitor C 51 simultaneously, the negative pole of described light emitting diode D19 and 56 pins that meet described chip ATT7035AU after the other end of described capacitor C 51 is connected, 28 pins of the described chip ATT7035AU of one termination of described resistance R 78, the base stage of the described triode V19 of the other end of described resistance R 78, the emitter of described triode V19 connects the Vout pin of described voltage adjuster XC6214P332PR, the collector of described triode V19 connects an end of described resistance R 82, the other end of described resistance R 82 connects an end of described capacitor C 50 and the positive pole of described light emitting diode D18 simultaneously, common ground after the other end of described capacitor C 50 is connected with the negative pole of described light emitting diode D18, 55 pins of the described chip ATT7035AU of one termination of described resistance R 79, the base stage of the described triode V21 of the other end of described resistance R 79, the collector of described triode V21 connects an end of described resistance R 85, and the other end of described resistance R 85 connects an end of described capacitor C 53 and the positive pole of described light emitting diode D20 simultaneously, 54 pins of the described chip ATT7035AU of one termination of described resistance R 77, the base stage of the described triode V20 of the other end of described resistance R 77, the emitter of described triode V20 and the Vout pin that meets described voltage adjuster XC6214P332PR after the emitter of described triode V21 is connected, the collector of described triode V20 connects an end of described resistance R 84, the other end of described resistance R 84 connects an end of described capacitor C 52 and the positive pole of described light emitting diode D0 simultaneously, the other end of described capacitor C 52, the negative pole of described light emitting diode D0, common ground after the other end of described capacitor C 53 is connected with the negative pole of described light emitting diode D20.

Embodiment 9:

On the basis of above-described embodiment, also comprise buzzer alarm circuit, shown in Figure 13, described buzzer alarm circuit comprises resistance R 80, R81, R86, capacitor C 54, diode D17, triode V22, hummer M1, 22 pins of the described ATT7035AU of one termination of described resistance R 86, the other end of described resistance R 86, after connecting, one end of described capacitor C 54 connects the base stage of described triode V22, common ground after the other end of described capacitor C 54 is connected with the collector of described triode V22, the emitter of described triode V22 connects the positive pole of described diode D17 and the end of described hummer M1 simultaneously, the negative pole of described diode D17, one end of the other end of described hummer M1 and described resistance R 80 is connected with an end of described resistance R 81, the other end of described resistance R 80 and the Vout pin that jointly meets described voltage adjuster XC6214P332PR after the other end of described resistance R 81 is connected.

Embodiment 10:

On the basis of above-described embodiment, also comprise meritorious impulse output circuit, shown in Figure 14, described meritorious impulse output circuit comprises the first photoelectrical coupler TLP785, resistance R 67, R68, R76, triode V18, diode D21, light emitting diode D16, capacitor C 38; 33 pins of the described ATT7035AU of one termination of described resistance R 76, the base stage of the described triode V18 of another termination of described resistance R 76, the grounded emitter of described triode V18, the collector of described triode V18 connects an end of described resistance R 67 and an end of described resistance R 68 simultaneously, the input end of the described first photoelectrical coupler TLP785 of another termination of described resistance R 68, the other end of described resistance R 67 connects an end of described capacitor C 38 and the negative pole of described light emitting diode D16 simultaneously, the other end of described capacitor C 38, the positive pole of described light emitting diode D16 and the Vout pin that jointly meets described voltage adjuster XC6214P332PR after another input end of described the first photoelectrical coupler TLP785 is connected, output terminal of described the first photoelectrical coupler TLP785 with jointly connect the meritorious pulse output of auxiliary terminal sampling end after described diode D21 negative pole is connected, another output terminal of described the first photoelectrical coupler TLP785 connects the meritorious pulse output of auxiliary terminal reference edge jointly after being connected with described diode D1 is anodal.

Embodiment 11:

On the basis of above-described embodiment, also comprise a second merit impulse output circuit, shown in Figure 15, within described second, the merit impulse output circuit comprises the second photoelectrical coupler TLP785, resistance R 91, R54, triode V23, diode D22, 21 pins of the described ATT7035AU of one termination of described resistance R 91, the base stage of the described triode V23 of another termination, the grounded emitter of described triode V23, the collector of described triode V23 connects an end of described resistance R 54, the input end of the described second photoelectrical coupler TLP785 of another termination of described resistance R 54, the Vout pin of the described voltage adjuster XC6214P332PR of another input termination of described the second photoelectrical coupler TLP785, output terminal of described the second photoelectrical coupler TLP785 with jointly connect auxiliary terminal pulse per second (PPS) output sampling end after described diode D22 negative pole is connected, another output terminal of described the second photoelectrical coupler TLP785 connects auxiliary terminal pulse per second (PPS) output reference edge after being connected with described diode D22 is anodal jointly.

Embodiment 12:

On the basis of above-described embodiment, also comprise data storage circuitry, shown in Figure 16, described data storage circuitry comprises storage chip BR24G128FJ-WE2, capacitor C 15, resistance R 34, R35, one end of described capacitor C 15, 8 pins of described storage chip BR24G128FJ-WE2, one end of described

resistance R

Obviously, above-described embodiment is only for example clearly is described, and is not the restriction to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without also giving all embodiments.And the apparent variation of being extended out thus or change are still among the protection domain in the invention.

Claims

1. an electronic single-phase keyboard prepayment meter, is characterized in that, comprises SOC interface circuit, power circuit and power-fail detection circuit, wherein,

Power circuit, comprise that externally provides a galvanic output terminal;

2. electronic single-phase keyboard prepayment meter according to claim 1, is characterized in that, described SOC interface circuit comprises system level chip ATT7035AU and peripheral circuit thereof.

3. electronic single-phase keyboard prepayment meter according to claim 2, is characterized in that, described power circuit comprises for externally providing galvanic AC/DC power-switching circuit and for the system works power circuit of working power that system is provided; Described AC/DC power-switching circuit comprises voltage dependent resistor (VDR) RV1, transformer TC1, diode D23, D24, D25, D26, and described diode D23, D24, D25, D26 form full-bridge rectifier; Described system works power circuit comprises capacitor C 2, C4, C7, C8, C9, polar capacitor C1, C3, power supply voltage stabilizing chip 7805, voltage adjuster XC6214P332PR; Alternating current connects the primary coil of described transformer TC1 by described voltage dependent resistor (VDR) RV1, the secondary coil of described transformer TC1 connects the input end of described full-bridge rectifier, and the output terminal of described full-bridge rectifier provides input signal as the output terminal of described AC/DC power-switching circuit to described power-fail detection circuit; The positive pole of the output terminal of described full-bridge rectifier, described polar capacitor C1 and the IN pin that jointly connects described power supply voltage stabilizing chip 7805 after an end of described capacitor C 2 is connected, common ground after the negative pole of described polar capacitor C1 is connected with the other end of described capacitor C 2; After connecting, the end of the positive pole of described polar capacitor C3, described capacitor C 4, C9 connects the OUT pin of described power supply voltage stabilizing chip 7805 and the Vin pin of described voltage adjuster XC6214P332PR, common ground after the negative pole of described polar capacitor C3 is connected with the other end of described capacitor C 4, C9 simultaneously; The GND pin ground connection of described voltage adjuster XC6214P332PR and described power supply voltage stabilizing chip 7 805, an end ground connection after described capacitor C 7, C8 parallel connection, the Vout pin of the described voltage adjuster XC6214P332PR of another termination.

4. electronic single-phase keyboard prepayment meter according to claim 3, is characterized in that, described power-fail detection circuit comprises resistance R 2, R3, R4, R6, capacitor C 6, triode V1, V3; One end of described resistance R 4 is as the output terminal of the described full-bridge rectifier of input termination of described power-fail detection circuit, one end of the other end of described resistance R 4, described resistance R 6 is connected with an end of described capacitor C 6 and their tie point connects the base stage of described triode V3, common ground after the other end of the emitter of described triode V3, described resistance R 6 is connected with the other end of described capacitor C 6; One end of the collector of described triode V3, described resistance R 3 is connected with the base stage of described triode V1, and the other end of described resistance R 3 is connected with an end of described resistance R 2 and their tie point connects the Vout pin of described voltage adjuster XC6214P332PR; The other end of described resistance R 2 is connected with the collector of described triode V1 and an end of described capacitor C 5, and their tie point connects 3 pins of described ATT7035AU; Common ground after the emitter of described triode V1 is connected with the other end of described capacitor C 5.

5. electronic single-phase keyboard prepayment meter according to claim 4, is characterized in that, also comprises control relay circuit, and described control relay circuit comprises L phase relay control circuit and N phase relay control circuit; Described L phase relay control circuit is identical with described N phase relay control circuit structure, wherein, described L phase relay control circuit and described N phase relay control circuit include triode V4, V5, V8, V9, V12, V13, resistance R 7, R8, R11, R12, R15, R16, R19, R20, R23, R24, R27, R28 and diode D6, D7, D10, D11 and magnetic latching relay;

6. according to the arbitrary described electronic single-phase keyboard prepayment meter of claim 3-5, it is characterized in that, described power circuit also comprises the system power supply commutation circuit of the standby power supply that system works is provided, and described system power supply commutation circuit comprises capacitor C 11 and polar capacitor C10 and standby power supply; One end of the positive pole of described polar capacitor C10 and capacitor C 11 is connected and their tie point connects 90 pins and the described standby power supply positive pole of described ATT7035AU, common ground after the negative pole of described polar capacitor C10 is connected with the other end of capacitor C 11; The negative pole of described standby power supply is by J2 and JP-2 ground connection.

7. electronic single-phase keyboard prepayment meter according to claim 6, it is characterized in that, also comprise communicating circuit, described communicating circuit is the magnetic adsorption type infrared communication circuit, described magnetic adsorption type infrared communication circuit comprises receiving circuit and radiating circuit, described receiving circuit comprises resistance R31, R36, R38, R40 and triode V16 and infrared receiving tube D14, and described radiating circuit comprises resistance R 32, R37, R39 and triode V17 and infrared transmitting tube D15;

8. electronic single-phase keyboard prepayment meter according to claim 7, it is characterized in that, also comprise keyboard circuit, described keyboard circuit comprises resistance R 61, R62, R63, R65, R66, R69, R72, R73, R74, R75, capacitor C 43, C44, C45, C46, C47, C48, C49 and carbon Key Pad KEY1, KEY2, KEY3, KEY4, KEY5, KEY6, KEY7 and chip XHC3-7A;

9. electronic single-phase keyboard prepayment meter according to claim 8, it is characterized in that, also comprise alternating current sampling circuit, described alternating current sampling circuit comprises current sampling circuit and voltage sampling circuit, described current sampling circuit comprises resistance R 42, R43, R44, R45, R46, R47, R48, R49, R50, R51, capacitor C 19, C20; Described voltage sampling circuit comprises resistance R 52, R53, R56, R58, R59, R60, R88, R89, R90, capacitor C 22, C23, C31, C33;

An end ground connection after described resistance R 50 is in parallel with described capacitor C 19,8 pins of the described ATT7035AU of another termination, connect the N line by described resistance R 42, R43, R44, R45, R46, R47, R48, R49 simultaneously, an end ground connection after described resistance R 51 is in parallel with described capacitor C 20,9 pins of the described ATT7035AU of another termination;

One end of described resistance R 56 is connected with an end of described resistance R 58 and their sampling end of the second current transformer of link connecting to neutral line current sampling use, ground connection after the other end of described resistance R 58 is connected with an end of described resistance R 59, the other end of described resistance R 59 is connected with an end of described resistance R 60 and their reference edge of the second current transformer of link connecting to neutral line current sampling use, connect 11 pins of described chip ATT7035AU after one end link of the other end of described resistance R 60 and described capacitor C 33, ground connection after the other end of described capacitor C 33 is connected with an end of described capacitor C 31, the other end of described capacitor C 31 and 10 pins that meet described chip ATT7035AU after the other end of described resistance R 56 is connected,

One end of described resistance R 52 is connected with an end of described resistance R 88 and their link connects the sampling end of the first current transformer of an end of described resistance R 89 and neutral line current sampling use simultaneously, ground connection after the other end of described resistance R 88 is connected with an end of described resistance R 90, the other end of described resistance R 90 is connected with an end of described resistance R 53 and their link connects the reference edge of the first current transformer of the other end of described resistance R 89 and neutral line current sampling use simultaneously, the other end of described resistance R 53 is connected 13 pins of the described chip ATT7035AU of termination with an end of described capacitor C 23, ground connection after the other end of described capacitor C 23 is connected with an end of described capacitor C 22, the other end of described capacitor C 22 and 12 pins that meet described ATT7035AU after the other end of described resistance R 52 is connected.

10. electronic single-phase keyboard prepayment meter according to claim 9, it is characterized in that, also comprise strong magnetic sensor circuit, backlight screen control circuit, buzzer alarm circuit, table cover and end button cover open detection circuit, meritorious impulse output circuit and second merit impulse output circuit;

Described table cover and end button cover open detection circuit comprise resistance R 70, R71, capacitor C 40, C42, button S1, S2; Common ground after one end of one end of described resistance R 70, an end of described resistance R 70, described capacitor C 40 is connected with an end of described capacitor C 42, the other end of the other end of described resistance R 70, described capacitor C 40 and 4 pins that jointly meet described ATT7035AU after 2 pins of described button S1 are connected, the other end of the other end of described resistance R 71, described capacitor C 42 and 5 pins that jointly meet described ATT7035AU after 2 pins of described button S2 are connected, 1 pin of described button S1 and 92 pins that jointly meet described ATT7035AU after 1 pin of described button S2 is connected;

11. electronic single-phase keyboard prepayment meter according to claim 10, it is characterized in that, also comprise data storage circuitry, described data storage circuitry comprises storage chip BR24G128FJ-WE2, capacitor C 15, resistance R 34, R35, one end of described capacitor C 15, 8 pins of described storage chip BR24G128FJ-WE2, one end of described resistance R 34 and 92 pins that jointly meet described chip ATT7035AU after an end of described resistance R 35 is connected, 6 pins of described storage chip BR24G128FJ-WE2 and 1 pin that jointly meets described ATT7035AU after the other end of described resistance R 34 is connected, 5 pins of described storage chip BR24G128FJ-WE2 and 2 pins that jointly meet described ATT7035AU after the other end of described resistance R 35 is connected, 1 pin of the other end of described capacitor C 15 and described storage chip BR24G128FJ-WE2, 2 pins, 3 pins, 4 pins, common ground after 7 pins connect.