CN106952411A - A kind of single-phase charge-controlled intelligent electric meter - Google Patents

Abstract

A kind of single-phase charge-controlled intelligent electric meter, including master data processor, the master data processor is provided with communication interface, and the master data processor is connected with LCD display, button, clock/battery module, internal storage, integrating metrology chip, power circuit, module for anti-fraudulent；The integrating metrology chip is connected respectively with voltage branch circuit, current sampling circuit, power circuit；The master data processor exports test pulse；The communication interface is connected with telecommunication circuit.This programme includes filtering, RS485, infrared communication, can carry out meter reading according to the demand using distance and place, flexible transformation mode, is limited without being transmitted the problems such as unstable or transmission cost high power height by single signal；Multiple functional, stability, antijamming capability are high, and measuring accuracy is high, safe and reliable.

Description

A kind of single-phase charge-controlled intelligent electric meter

Technical field

The invention belongs to electronic electricity meter technical field, and in particular to a kind of single-phase charge-controlled intelligent electric meter.

Background technology

In daily life, what ordinary residence user installation was used is all two grades of electric energy meters, and conventional Household electric energy table is mostly Function is relatively simple, and early stage meter reading is all the manual transcription electricity consumption number of degrees, and with development in science and technology, existing electric energy meter is handed over extraneous Data are changed mainly by communication, communication modes include infrared communication, RS485 is communicated, carrier communication, infrared communication is typically several Communicated in rice with infrared control device, conveniently visit meter reading or test.Other communication modes are generally telecommunication, that is to say, that Automatic data logging is realized by a terminal server.Much electricity table is mostly only provided with a kind of current mode, merely by one Kind of mode carries out meter reading, and single communication mode is easy to by being limited using site environment so that data effect is copied and accepted in communication Really bad, such as carrier communication is easily disturbed.Although in addition, existing intelligent electric meter than manual metering improve meter reading accuracy, But there is interference between the connection of each circuit and communication module, the use of ammeter brings ripple to power network, and power network can produce humorous Shake and cause overcurrent or overvoltage, easily trigger accident, increase equipment loss.Other a variety of circuit modules are set together, and deposit The problems such as to the resistance low intensity of strong magnetic disturbance, poor security, remote parameter modification operation inconvenience.

The content of the invention

The invention aims to solve the above problems there is provided a kind of single-phase charge-controlled intelligent electric meter, with metering essence Spend high, low in energy consumption, performance it is stable, safe and reliable, it is easy to use the advantages of.

In order to reach foregoing invention purpose, the present invention uses following technical scheme：

A kind of single-phase charge-controlled intelligent electric meter, including master data processor, the master data processor connect provided with communication Mouthful, the master data processor and LCD display, button, clock/battery module, internal storage, integrating metrology chip, electricity Source circuit, module for anti-fraudulent connection；The integrating metrology chip and voltage branch circuit, current sampling circuit, power circuit point Do not connect；The master data processor exports test pulse；The communication interface is connected with telecommunication circuit.

Further, the current sampling circuit includes single-phase live wire current sampling circuit and single-phase neutral line current sampling electricity Road, single-phase live wire current sampling circuit for manganese copper diverter two output ends respectively with resistance R56 one end, resistance R57 one end Connection, is connected to resistance R61 between resistance R56 one end, resistance R57 one end, the resistance R56 other ends, the resistance R57 other ends are indirectly There are electric capacity C31, the electric capacity C32 of series connection, electric capacity C31, electric capacity C32 connect simulation ground；Single-phase neutral line current sample circuit is that electric current is mutual Two output ends of sensor are connected with resistance R63 one end, resistance R66 one end respectively, between resistance R63 one end, resistance R66 one end It is connected to electric capacity C33, the electric capacity that series connection is connected between the resistance R64 of series connection, resistance R65, the R63 other end, the resistance R66 other ends C34。

Further, the voltage branch circuit be connected on zero line resistance R81, resistance R82, resistance R83, resistance R84, Resistance R85, resistance R86, resistance R87, resistance R88 are sequentially connected in series；Connect with resistance R74, resistance R23 to the simulation being connected on live wire Connect, resistance R74 two termination one electric capacity C39, resistance R23 two one electric capacity C38 of termination.

Further, shown clock/battery module includes battery Switching power circuit, clock chip circuit, the master data Both any interconnections in processor, battery Switching power circuit, clock chip circuit three, the clock chip circuit is adopted Use RN8025T models.

Further, master data processor also alerts drive circuit, relay test with built-in relay drive circuit, tripping operation Circuit, external relay drive circuit are connected respectively.

Further, the power circuit is that a piezo-resistance RR1, piezo-resistance are concatenated between live wire L lines and zero line N lines RR1 two ends connect the pin of primary coil the 5th of transformer, 1 pin respectively, and thermistor is further connected between piezo-resistance RR1 and 1 pin RT1；The pin of transformer the 4th, 5 pin connect voltage stabilizing chip IC2 the 3rd pin, 2 pin, the 4th pin of primary coil and voltage stabilizing respectively It is connected to diode D4 between 3rd pin of chip IC 2, electric capacity parallel with one another is circumscribed between voltage stabilizing chip IC2 the 3rd pin, 2 pin EC4, electric capacity C58, wherein electric capacity EC4 positive pole are connected with voltage stabilizing chip IC2 the 3rd pin, electric capacity EC4 negative pole and voltage stabilizing chip IC2 the 2nd pin connection, electric capacity EC5 in parallel, electric capacity C60, electric capacity EC5 are circumscribed between voltage stabilizing chip IC2 the 1st pin and 2 pin Negative pole and electric capacity C60 between node connect the earth, between electric capacity EC5 positive pole and electric capacity C60 node output second voltage DVDD；The pin of transformer secondary coil the 6th, 7 pin connect rectifier bridge stack BD1 the 3rd pin, 4 pin, the 1st of rectifier bridge stack BD1 the respectively Pin, 2 pin positive pole respectively with electric capacity EC1, negative pole are connected, electric capacity EC1 positive pole output front voltage VDCC；Transformer secondary output line Enclose the 9th pin, 10 pin and meet voltage stabilizing chip IC1 the 3rd pin Vin, 2 pin GND respectively, the of the pin of secondary coil the 9th and voltage stabilizing chip IC1 It is connected to diode D3 between 3 pin Vin, external electric capacity EC3 in parallel, electric capacity C44 between voltage stabilizing chip IC1 the 3rd pin, 2 pin, its Middle electric capacity EC3 positive pole is connected with voltage stabilizing chip IC1 the 3rd pin, and electric capacity EC3 negative pole connects with voltage stabilizing chip IC1 the 2nd pin Connect, external capacitor C51 between voltage stabilizing chip IC1 the 1st pin and 2 pin, exported between voltage stabilizing chip IC1 the 1st pin and electric capacity C51 Voltage V485, for being powered to 485 communicating circuits；Output voltage between diode D3 and voltage stabilizing chip IC1 the 3rd pin+ 12V485。

Further, the front voltage VDCC is connected with power supply DC/DC change-over circuits, the power supply DC/DC change-over circuits Including the first change-over circuit, the second change-over circuit and the 3rd change-over circuit, first change-over circuit includes amplifier chip IC4, resistance R110, resistance R111, electric capacity C8, inductance L2, circuit front-end voltage VDCC and resistance R110, amplifier chip IC4 The 4th pin be sequentially connected, the node between resistance R110 input and the pin of amplifier chip IC4 the 5th connects the one of electric capacity C52 End, electric capacity C52 other ends ground connection, node and electric capacity C8, inductance between the pin of amplifier chip IC4 the 6th, diode D7 negative pole The nodes of L2 between the two are connected with each other, and the pin of amplifier chip IC4 the 1st and resistance R111, electric capacity C8, inductance L2 inputs are successively Connection, the pin of amplifier chip IC4 the 2nd ground connection, inductance L2 inputs are connected with diode D7 negative pole, inductance L2 output ends, two Pole pipe D7 positive pole series resistor R112, resistance R113 between the two, resistance R112, the nodes of resistance R113 between the two are with putting The big pin connection of device chip IC 4 the 3rd, the node ground connection between diode D7 positive pole and resistance R113, inductance L2 output ends and electricity Node output services voltage VDD, electrochemical capacitor EC2 and electric capacity C50 between resistance R112 are arranged in parallel the circuit on one side to be formed and connect Node between inductance L2, resistance R112, electrochemical capacitor EC2 and electric capacity C50 are arranged in parallel the circuit other end to be formed ground connection, electricity Solution electric capacity EC2 positive pole is connected with resistance R112；Second change-over circuit includes resistance R114, resistance R115, amplifier chip IC5, resistance R117, resistance C43, inductance L1, resistance R112, resistance R113 and diode D7, front voltage VDCC and resistance R114, resistance R115, amplifier chip IC5 the 4th pin are sequentially connected, both resistance R114 and amplifier chip IC5 the 5th pin Between node be connected with electric capacity C62 one end, the C62 other ends ground connection；The pin of amplifier chip IC5 the 6th, diode D10 negative poles two Node of the node with electric capacity C43, inductance L1 between the two between person is connected with each other, the pin of amplifier chip IC4 the 1st and resistance R117, electric capacity C43, inductance L1 are sequentially connected, and resistance R118, R119 are serially connected between inductance L1 and diode D10 positive poles, amplification The pin GND of device chip IC 5 the 2nd is grounded, resistance R118, resistance R119 node between the two and the pin of amplifier chip IC5 the 3rd company Connect, resistance R119, electric capacity C46, diode D10 are grounded, the node output services voltage between inductance L1 and resistance R112 ZB12V；The pin of input 3 that 3rd change-over circuit includes voltage stabilizing chip IC3, front voltage VDCC and voltage stabilizing chip IC3 is connected, surely Press the pin of earth terminal 2 ground connection of chip IC 3, the voltage stabilizing chip IC3 pin output services voltage VDD of output end 1.Further, it is described logical Letter circuit is infrared communication circuit, and infrared communication circuit includes infrared transtation mission circuit and infrared receiving circuit, the infrared receiver Circuit includes IR signal reception pipe IR1, and the pin of IR signal reception pipe IR1 the 1st meet the 17th pin of MCU chip, electric capacity C42, red The pin of external signal reception pipe IR1 the 3rd are connected respectively with resistance R75, electric capacity C41, and resistance R75 meets operating voltage VDD, electric capacity C42, electricity Hold C41, the pin of IR signal reception pipe IR1 the 2nd to be all grounded；The infrared transtation mission circuit includes infrared signal transmitting tube IR2, work Voltage VDD is connected with PNP triode Q2 emitter stage, and PNP triode Q2 colelctor electrode is connected respectively with resistance R79, R78, electricity Node between resistance R79, R78 is connected with infrared signal transmitting tube IR2 positive poles, infrared signal transmitting tube IR2 negative poles ground connection, PNP Triode Q2 base stages, resistance R80, the 18th pin of MCU chip are sequentially connected.

Further, telecommunication circuit also includes RS485 communicating circuits and/or carrier communication interface circuit, the RS485 communications Circuit is including in optocoupler OPT1, optocoupler OPT2, RS485 chip U4, signal receiving end RX485 and resistance R89 one end, optocoupler OPT1 Transistor collector connect respectively, the transistor emitter in resistance R89 another termination operating voltage VDD, optocoupler OPT1 connects Simulation ground；Light-Emitting Diode positive pole in optocoupler OPT1 is connected with resistance R90 one end, and resistance R90 meets power supply V485, optocoupler OPT1 Interior Light-Emitting Diode negative pole is connected with the pins of RS485 chips U4 the 1st；Signal sending end TX485 and resistance R17 one end, optocoupler Light-Emitting Diode negative pole in OPT2 is connected respectively, and the Light-Emitting Diode positive pole in optocoupler OPT2 meets operating voltage VDD, optocoupler Phototriode colelctor electrode in OPT2 connects phototriode emitter stage and RS485 chips U4 in power supply V485, optocoupler OPT2 2nd pin, 3 pin, the connection of resistance R4 one end, the pin of RS485 chips U4 the 4th are connected with resistance R91 one end, the resistance R4 other ends, resistance Another terminating systems power supplys of R91；RS485 chips U4 the 8th pin, the 5th pin with connecing power supply V485, system power supply respectively, RS485 The pin of chip U4 the 6th, 7 pin are connected with RS485 signal plugs or pin interface 485B, 485A respectively；The pin of RS485 chips U4 the 8th, One resistance R93 of connection between the pin of resistance R92, a RS485 chip U4 the 7th, 5 pin is connected between 6 pin；Transition diode TVS1 and Thermistor RT2 is constituted, and transition a diode TVS1, the RS485 chips U4 is connected between the pin of RS485 chips U4 the 6th, 7 pin A thermistor RT2 is connected between 6th pin and signal plug or pin interface 485A.

Further, signal circuit include power test pulse signal transmission circuit, multifunctional signal transmission circuit, RS485 signal circuits, the power test pulse signal transmission circuit, multifunctional signal transmission circuit, RS485 signals are passed Transmission of electricity road is connected with MCU data processors respectively.

Compared with prior art, beneficial effect is the present invention：

1. this programme include filtering, RS485, infrared communication, can according to using apart from and place demand, Flexible transformation mode carries out meter reading, is limited without being transmitted the problems such as unstable or transmission cost high power height by single signal System.

2. by different grounding designs and signals transmission the reasons why opto-coupler chip, mutual interference between reduction signal and Electromagnetic compatibility problem, plays a part of isolation forceful electric power and light current, whole electric energy meter system operation is with very big reliability and surely It is qualitative.

3. an electric energy meter circuit has time-sharing measurement, electric parameter measurement, electrical energy pulse output, parameter storage, power failure aobvious The function such as show, and measuring accuracy is high, low in energy consumption, performance stable, is widely used in city rural households table；

4. multiple functional, stability, antijamming capability are high, and measuring accuracy is high, safe and reliable.

Brief description of the drawings

Fig. 1 is single-phase charge-controlled intelligent electric meter structural representation；

Fig. 2 is the MCU chip circuit of processor；

Fig. 3 is metering circuit schematic diagram；

Fig. 4 is power circuit schematic diagram；

Fig. 5 is power supply DC/DC change-over circuit schematic diagrames；

Fig. 6 is built-in relay drive circuit and tripping operation alarm drive circuit

Fig. 7 is relay test circuit；

Fig. 8 is external relay drive circuit；

Fig. 9 is battery Switching power circuit；

Figure 10 is carrier communication interface circuit；

Figure 11 is button (i.e. button) circuit；

Figure 12 is ESAM chips (security module) circuit；

Figure 13 is clock chip circuit；

Figure 14 is data storage circuitry；

Figure 15 is infrared communication circuit；

Figure 16 is 485 telecommunication circuits；

Figure 17 is signal circuit；

Figure 18 is that electrical energy pulse is indicated and indicating circuit of operating a switch；

Figure 19 is liquid crystal display and backlight circuit；

Figure 20 is CPU card card seat circuit.

Embodiment

Explanation is further described to technical scheme below by specific embodiment.

As illustrated, a kind of single-phase charge-controlled intelligent electric meter, including master data processor, master data processor is provided with logical Believe interface, master data processor and LCD display, button, clock/battery module, internal storage, integrating metrology chip, peace Full module, power circuit connection；The integrating metrology chip is connected with voltage branch circuit, current sampling circuit, power circuit； The master data processor exports test pulse；The communication interface is connected with telecommunication circuit.Clock/battery module includes battery Switching power circuit (Fig. 9), clock chip circuit (Figure 13), the master data processor, battery Switching power circuit, clock core Both any interconnections in piece circuit three.Key circuit (Figure 11) is button.Master data processor is also electric with security module Road (i.e. ESAM chip circuits-Figure 12) is connected.Liquid crystal and backlight circuit 19 are LCD display.Data storage circuitry (Figure 14) is Internal storage.Master data processor is Fig. 2 MCU chip circuit.Telecommunication circuit include infrared communication circuit (Figure 15), RS485 communicating circuits (Figure 16) and carrier communication interface circuit (Figure 10).

Built-in relay drive circuit and tripping operation alarm drive circuit (Fig. 6), relay test circuit (Fig. 7), it is external after Electrical apparatus driving circuit (Fig. 8) is connected with master data processor.

Signal circuit (Figure 17) includes three parts, a signal circuit between computation chip-MCU chip, Test pulse output (i.e. test pulse in Fig. 1) circuit of the Multifunctional mouth of MCU chip, digital serial port signal circuit.

In electrical energy pulse and indicating circuit of operating a switch (Figure 18), electrical energy pulse is exported by MCU, is MCU same with test pulse The output of one delivery outlet, be Parallel opertation, is exported similar to partial pressure.

As shown in Figure 1-2, master data processor uses the main MCU chips of FM331X, integrating metrology chip U6 and MCU chip 27 pin CF-IN connections, the active pulse of computation chip output inputs MCU 27 pin CF-IN, 68 pin of MCU chip by circuit Test pulse CFLL is exported, for test error；And LCD 3-8 pin COM0-COM5 in MCU chip is liquid crystal drive mouthful, i.e., The interface of monitor signal connection；9th, 10 pin RX485, TX485 are the reception and emission port that RS485 communicates；13rd, 14 pin MIC-RXD, MIC-TXD are reception and the emission port of computation chip serial ports and MCU serial ports；17th, 18 pin IR-RXD, IR-TXD are The reception of Infrared communications signals and emission port；39th, 40 pin ZB-RXD, ZB-TXD are the reception and transmitting for connecing carrier communication module Mouthful；1st, 41,42,47 pin be state's net safety chip (i.e. security module such as ESAM chips) interface；30th, 31,32 pin be ammeter Multifunctional pulse delivery outlet, such as pulse of period switching, clock test pulse, requirement recurrent pulse (being used in such as three-phase meter), It can be exported by switching command in same delivery outlet；73rd pin RelayCtrl is the control signal delivery outlet of external relay；The 74 pin RelayTest are the detection signal input of built-in relay or external relay, and detection judges whether to jump, synthesizes work(； 44th, 45 pin RELAY-ON, RELAY-OFF are built-in on-load switch control signal (combined floodgate trips) delivery outlet.Integrating metrology The active pulse of chip output inputs 27 pin CF-IN of MCU chip by circuit, then carries out scaling down processing, is allowed to and whole electricity The instrument constant of table is consistent.Last 68 pin by MCU chip export test pulse CFLL, for test error.

In MCU chip, resistance R32 one end is in parallel with resistance R7 one end, and the resistance R32 other end and the 42 of MCU chip are drawn Pin is connected, and the resistance R7 other ends are connected with 43 pin ICIO pins, and resistance R32 and resistance R7 is 10K 5%0603 from size Chip-R.A the 55th pin PWRDET of termination in parallel with electric capacity C4 resistance R10, other end ground connection, the 55th pin Node between PWRDET and resistance R10 is connected with resistance R9, and resistance R10 selects 33K 1%0603, resistance R19 to select 200K 1%0603, electric capacity C4 select 100NF 10%0603, and resistance R10, resistance R9, electric capacity C4 be not by the way of welding.Resistance It is grounded after R19 one end is in parallel with resistance R20 one end, the resistance R19 other ends are connected with the pin of MCU chip 30, the resistance R20 other ends It is connected with 31 pins, resistance R19, resistance R20 select 10K 5%0603 Chip-R.Resistance R5 is in parallel with electric capacity C24 latter End ground connection, another termination 75 pin PROG, resistance R5 select 100R5%0603 Chip-Rs, and electric capacity C24 is 1UF 10%0603 16V.27th pin CF IN connect and be grounded after electric capacity C2, and electric capacity C2 selects 100NF 10%0603.37 pin connecting resistance R27, resistance R27 selects 100R 5%0603.An external passive crystal oscillator X2 between 60 pins and 61 pins, passive crystal oscillator X2 is three pin crystal oscillators, It is a kind of composite component for integrating crystal oscillator and electric capacity, the timing reference scheme 32.768KHZ ± 20PPM of selection standard.Knot Each circuit diagram is closed, a pin of MCU chip can connect corresponding pin in multiple circuit diagrams, and some pins of MCU chip connect Load resistance connects electric capacity again, plays current limliting or supplying resistance effect, and it is high-frequency noise filtering that pin, which connects ground connection after electric capacity, Effect.The effect that pin connects the power supply such as output VDD/3.6 after electric capacity is to move back even, filtering, is inputted by cell voltage.When VDD is 5V The 3.6V that VDD/3.6 is switched to after power down powers.63 pin input 3.6V operating voltages, and battery can not charge, and prevent The circuit of charging.In the electronic circuit of present embodiment, VCC is the supply voltage of circuit, and VDD is the operating voltage of chip. VDCC is the front voltage for not inputting DC/DC chips.

Security module circuit is ESAM chip circuits, including security module ESAM chips U3, ESAM chip U3 1 pin connects Ground, ESAM chips U3 3 pin connect 42 pin of MCU chip, and ESAM chips U3 6 pin and resistance R40 one end, electric capacity C29 one end connect Connect, the resistance R40 other ends connection pin of MCU chip the 41st, electric capacity C29 other ends ground connection, ESAM chips U3 7 pin connect MCU chip 47 pin, ESAM chips U3 8 pin are connected respectively with electric capacity C15 one end, electric capacity C30 one end, resistance R25 one end, and resistance R25 is another Terminate the pin of MCU chip 1, the electric capacity C15 other ends, electric capacity C30 other ends ground connection.Electric capacity C15 and electric capacity C30 plays filter action. ESAM chips U3 selects ESAM SOP8 models, and resistance R40 selects 51R 5%0603, resistance R25 to select 10R 5%0603, electricity Holding C29 selects 20PF 5%0603, electric capacity C15 to select 10UF, electric capacity C30 to select 100NF 10%0603.

Metering circuit includes integrating metrology chip U6 and constituted with voltage branch circuit, current sampling circuit, current sample electricity Road includes single-phase live wire current sampling circuit and single-phase neutral line current sample circuit.Current sampling circuit (Fig. 3) includes single-phase fire Line current sample circuit and single-phase neutral line current sample circuit, sampling filter is carried out to voltage, while being also linear (perceptual angle Difference) adjustment.Voltage branch circuit sampling zero line, sampling filter is carried out to voltage.

Single-phase live wire current sampling circuit is that input M+, the output end M- of live wire of live wire and manganese copper diverter two ends connect (i.e. the pad or pad of lead) is connect, node and input M+ connections between resistance R56, resistance R61, resistance R57, resistance Node between R61 is connected with output end M-, and resistance R56 is connected with electric capacity C31, and resistance R57 is connected with electric capacity C32, electric capacity C31, electric capacity C32 connect simulation ground.Resistance R56, resistance R57 use the Chip-Rs of 1.2K 1%0805, and resistance R61 uses 5.1R 1%0805 do not weld, and electric capacity C31 and electric capacity C32 use 33NF 10%0805.Single-phase live wire current sampling circuit is used for manganese Copper current divider two ends electric current is sampled, and partial pressure, electric capacity are carried out by the circuit being made up of resistance R61, resistance R56, resistance R57 C31, electric capacity C32 are output to after being filtered in integrating metrology chip.

Single-phase neutral line current sample circuit connects current transformer respectively for input CT+, the output end CT- of zero line of zero line Two ends, the node between resistance R63, resistance R64 is connected with input CT+, the node between resistance R65, resistance R66 with it is defeated Go out and hold CT- to connect, resistance R63 is connected with electric capacity C33, resistance R66 is connected with electric capacity C34, between resistance R64 and resistance R65 Node, electric capacity C33, electric capacity C34 are grounded.Resistance R63 and resistance R66 uses 1.2K 1%0603, resistance R64 and resistance R65 33NF 10%0603 is used using 5.1R 1%0603, electric capacity C33 and electric capacity C34.Single-phase neutral line current sample circuit be used for pair Current transformer two ends electric current is sampled, by being entered by resistance R63, resistance R64, resistance R65, resistance the R66 circuit constituted Row partial pressure, then by being output to after electric capacity C33 and electric capacity C34 filtering in integrating metrology chip.The design of the circuit causes electric current Sample circuit possesses anti-electricity-theft effect, prevents that zero line can equally carry out sampling metering when live wire from not connecing.

Voltage branch circuit is hot voltage sample circuit, resistance R81, resistance R82, resistance R83, resistance R84, resistance R85, resistance R86, resistance R87, resistance R88 are sequentially connected in series.Voltage branch circuit just 220V alternating voltage is down to mV In 9 pin of the integrated computation chip of level input.Resistance R81, resistance R82, resistance R83, resistance R84, resistance R85, resistance R86, electricity Hinder R87, resistance R88 and all use 150K 1%0805.It is connected with resistance R74, resistance R23 to the simulation being connected on live wire, resistance R74 two termination one electric capacity C39, resistance R23 two termination one electric capacity C38, resistance R74, resistance R23 use 1.2K 1% 0603, electric capacity C39, electric capacity C38 use 33NF 10%0603.Resistance R74, resistance R23 carry out partial pressure through electric capacity C39, electric capacity Integrating metrology chip is input to after C38 filtering.Multiple resistant series play a part of partial pressure and are depressured, and voltage is larger in circuit, Single or a few resistor power is limited, and there is partial pressure protective resistance to be hardly damaged, and otherwise single resistance is also easily burnt out.Together When multiple resistant series when, there is capacitance profile between resistance and resistance, be conducive to computation chip to it is resistive with it is perceptual between Linear smoothing is measured, that is, measuring will linearly get well.In side circuit plate, resistance upper-lower position, which staggers, to be put, and is conducive to by electricity Magnetic compatibility experiment, with the effect for eliminating interference signal, that is, strengthens antijamming capability.

Integrating metrology chip is used in RN8209C chips, single-phase live wire current sampling circuit through the filtered electricity of electric capacity C31 Signal is pressed to input in the 5th pin V1P of integrated computation chip, single-phase live wire current sampling circuit through the filtered voltages of electric capacity C32 Signal inputs the 6th pin V1N of integrated computation chip；Single-phase neutral line current sample circuit is through the filtered voltage signals of electric capacity C33 The 7th pin V2P of integrated computation chip is inputted, single-phase neutral line current sample circuit is inputted through the filtered voltage signals of electric capacity C34 8th pin V2N of integrating metrology chip；Neutral voltage sample circuit inputs mV magnitude voltage signals on the 9th pin of integrated computation chip V3P, the simulation ground of live wire inputs the 9th pin of integrated computation chip through electric capacity C39, the filtered voltage signals of electric capacity C38 respectively V3P, the 10th pin V3N；Node connection between the 4th pin and resistance R72, electric capacity C37 of integrating metrology chip, electric capacity C37, electricity Hold C26 and connect simulation ground；It is provided between 11st pin and simulation ground by electric capacity C36, electric capacity C18 and the circuit being unified into；1st pin OSCO is the output end of external crystal, and the 16th pin OSCI is the input of external crystal, respectively with passive crystal oscillator X1 two ends Connection, passive crystal oscillator X1 two ends are also connected to electric capacity C67, electric capacity C68 respectively, and electric capacity C67, electric capacity C68 connect digitally；Metering core 12,13 pin of piece are that elementary error inputs and exported debugging mouth, realize software compensation debugging function, reach that to be not required to human weld short Road mode debugs the purpose of measuring accuracy, the debugging speed and measuring accuracy of precision is reached fast and height.That is environmental protection and people Body health, also saves man power and material.The 13rd pin M RX, the 12nd pin M TX of integrating metrology chip are digital serial port, Digital serial port the 14th, 13 pin M_TX, M_RX with MCU chip are connected by optocoupler, and optocoupler plays the work of forceful electric power and light current isolation With.The baud rate of the serial communication is fixed as 4800bps.Integrating metrology chip U6 detects neutral line current, judge user with Electricity.With 220V and electricity consumption time reckoning or electricity consumption electric energy is estimated, to settle accounts.The pin of chip U6 the 11st connect 2 electric capacity, and C36 is Electrochemical capacitor, C18 is C36 weakening electric capacity, is all the effect of decoupling filtering.Resistance R72 selects 10R 5%0603, electric capacity C37, electric capacity C26 select 100NF 10%0603；C36, electric capacity C18 select 10UF 10%0805 16V X5R, 100NF respectively 10%0805, electric capacity C67, electric capacity C68 select 20PF 5%0603, and crystal oscillator selects 3.5795MHZ ± 20PPM.

Voltage sampling signal is input to after integrating metrology chip with current sampling signal, is obtained by the multiplier in chip The analog signal of power, then analog signal is converted to data signal, then pulse signal is converted into by frequency divider progress, from collection 2 pin PF, 3 pin QF output pulse into computation chip.2 pin output active energy verification pulse (referred to as active pulse), the output of 3 pin Reactive energy verification pulse (referred to as idle pulse), 2 pin export the 27 pin CF- that active pulse inputs MCU chip by circuit again IN, then scaling down processing is carried out, it is allowed to consistent with the instrument constant of whole ammeter.Last 68 pin by MCU export test pulse CFLL。

Power circuit is concatenates a piezo-resistance RR1 between live wire L lines and zero line N lines, piezo-resistance RR1 two ends are distinguished The pin of primary coil the 5th, 1 pin of transformer are connect, thermistor RT1 is further connected between piezo-resistance RR1 and 1 pin；Primary The pin of coil the 4th, 5 pin connect voltage stabilizing chip IC2 the 3rd pin, 2 pin, the 4th pin of primary coil and voltage stabilizing chip IC2 the 3rd pin respectively Between be connected to diode D4, be circumscribed with electric capacity EC4 parallel with one another, electric capacity C58 between voltage stabilizing chip IC2 the 3rd pin, 2 pin, its Middle electric capacity EC4 positive pole is connected with voltage stabilizing chip IC2 the 3rd pin, and electric capacity EC4 negative pole connects with voltage stabilizing chip IC2 the 2nd pin Connect, electric capacity EC5 in parallel, electric capacity C60, electric capacity EC5 positive pole and electric capacity are circumscribed between voltage stabilizing chip IC2 the 1st pin and 2 pin Node output voltage DVDD between C60, powers to integrating metrology chip circuit and MCU chip partial circuit)；Transformer secondary output The pin of coil the 6th, 7 pin connect rectifier bridge stack BD1 the 3rd pin, 4 pin respectively, rectifier bridge stack BD1 the 1st pin, 2 pin respectively with electric capacity EC1 positive pole, negative pole connection, electric capacity EC1 positive pole are connected with output voltage VDCC ends, electric capacity EC1 negative pole ground connection；Voltage VDCC is used to supply carrier module circuit and load switching circuit；The pin of transformer secondary coil the 9th, 10 pin connect voltage stabilizing chip respectively IC1 the 3rd pin Vin, 2 pin GND, are connected to diode D3, surely between the pin of secondary coil the 9th and voltage stabilizing chip IC1 the 3rd pin Vin Press external electric capacity EC3 in parallel, electric capacity C44 between the 3rd pin Vin, the 2 pin GND of chip IC 1, wherein electric capacity EC3 positive pole with it is steady The 3rd pin connection of chip IC 1 is pressed, electric capacity EC3 negative pole is connected with voltage stabilizing chip IC1 the 2nd pin, voltage stabilizing chip IC1 the 1st pin Extracting power supply cord interface V485 between the external capacitor C51 between 2 pin, voltage stabilizing chip IC1 the 1st pin and electric capacity C51, for 485 communicating circuits are powered；Power supply+12V485 is drawn between diode D3 and voltage stabilizing chip IC1 the 3rd pin；Voltage stabilizing chip IC1's Node ground connection between 2nd pin and electric capacity C51.

RR1 is that piezo-resistance, RT1 are thermistor.RT1 can also constitute the member of three legs with another small piezo-resistance Ra Device collectively constitutes power protecting circuit with RR1.Particularly lightning protection, anti-zero line grounding or zero line do not connect situation, protect gauge pressure device And power circuit.VDCC supplies carrier module circuit and load switching circuit；Voltage V485 supplies RS485 telecommunication circuits；Simulation power supply Voltage DVDD supplies computation chip part and MCU chip partial circuit.

Transformer input is the 220VAC of standard, and the pin of secondary coil the 6th, 7 pin are output as 8V/220Ma, secondary Level coil the 9th pin, 10 pin are output as 11V/20mA.Piezo-resistance RR1 selects the piezo-resistances of S20K 420.Electric capacity EC1 is selected 1000UF/35V/WL 12.5*25, rectifier bridge stack BD1 select MB10S MBS.Diode D3, diode D4 select M7DO- 214AC, electric capacity EC4 select 220UF/35V/WL 10*12.5, electric capacity EC3 to select 100UF/50V/WL 8*11.5, electric capacity EC5 From 100UF//10V/WL 5*11, electric capacity C44, electric capacity C58, electric capacity C51, electric capacity C60 select 100NF 10%0603.Surely Chip IC 1, voltage stabilizing chip IC2 are pressed from the model of 78L05SOT-89 length electricity.Thermistor RT1 from MZ1106E151~ The pin of 215RM/10D3 91 3.

DC/DC change-over circuits include using amplifier chip IC4 change-over circuit, the circuit using amplifier chip IC5 and adopted With voltage stabilizing chip IC3 change-over circuit, voltage VDCC is converted into corresponding voltage respectively to load by above three change-over circuit On-off circuit, carrier communication interface circuit and CPU card card seat circuit are powered.Wherein when the operating voltage VDD of needs is voltage DCDC, uses amplifier chip IC4 change-over circuit to connect successively for front voltage VDCC and resistance R110, amplifier chip IC4 4 pin Connect, resistance R110 input connects electric capacity C52 one end with the node of amplifier chip IC4 5 pin between the two, electric capacity C52 is another One end is grounded, amplifier chip IC4 6 pin, the nodes and electric capacity C8, the nodes of inductance L2 between the two of diode D7 between the two It is connected with each other, amplifier chip IC4 1 pin and resistance R111, electric capacity C8 are sequentially connected, and amplifier chip IC4 2 pin GND connect simulation Ground, resistance R112, the nodes of resistance R113 between the two are connected with amplifier chip IC4 3 pin, inductance L2 respectively with resistance R112, operating voltage VDD output ends, electric capacity EC2 positive poles, electric capacity C50 connections, electric capacity EC2 negative poles, resistance R113, electric capacity C50, Diode D7 is grounded.

Front voltage VDCC is connected with voltage stabilizing chip IC3 the 3rd pin Vin, voltage stabilizing chip IC3 the 2nd pin ground connection, voltage stabilizing core Piece IC3 the 1st pin Vout is connected with operating voltage VDD output ends.Voltage stabilizing chip IC3 is using the electric model of 78L05SOT-89 length.

Use amplifier chip IC5 circuit for front voltage VDCC and resistance R114, resistance R115, amplifier chip IC5 4 Pin is sequentially connected, and resistance R115 is connected with resistance R116 one end, resistance R116 one end other end ground connection, the connection of resistance R116 two ends The node of one electric capacity C61, resistance R114 and amplifier chip IC5 5 pin between the two is connected with electric capacity C62 one end, the C62 other ends Ground connection；Node phase of amplifier chip IC5 6 pin, the nodes of diode D10 between the two with electric capacity C43, inductance L1 between the two Connect, amplifier chip IC5 1 pin and resistance R117, electric capacity C43 are sequentially connected, amplifier chip IC5 2 pin ground connection, resistance R118, the nodes of resistance R119 between the two are connected with amplifier chip IC5 3 pin, inductance L1 respectively with electric capacity C100, resistance R118, operating voltage ZB12V output ends, electric capacity EC8 positive poles, electric capacity C46 connections, electric capacity EC8 negative poles, resistance R119, electric capacity C46, diode D10 connect simulation ground.VDCC is by two DC/DC change-over circuit IC4 and IC5, for carrier module circuit, load On-off circuit and CPU card seat circuit.Load switching circuit refers to the drawing of power load, lock circuit, and resident's cost arrear is supplied The report control platform of electric company side is sent after order of operating a switch, and the on-load switch inside ammeter or outside it then disconnects, and resident is then not Energy electricity consumption, reaches the purpose of expense control function.R116 is biasing resistor, the effect of C61 filtering.Electric capacity EC2 is electrochemical capacitor, C50 It is EC2 weakening electric capacity, is all the effect of decoupling filtering.

In foregoing circuit, IC4 uses LV2842XLVDDCR SOT6 chips.Resistance R110 uses 100K 1%0603, electricity Hindering R111 uses 0R 5%0603, resistance R112 to use 54.9K 1%0603, resistance R113 to use 10K 1%0603, electric capacity C52, electric capacity C50 and electric capacity C8 use 100NF 10%0603, electric capacity EC2 to use 330UF/16V/WL 8*11.5, inductance L2 to adopt SS14DO-214AC is used with WQPIG4018-220M, diode D7.IC5 uses LV2842XLVDDCR SOT6 chips, resistance R114 uses 60.4K 1%0603, and resistance R115, resistance R117 use 0R 5%0603, resistance R116 to use 7.87K 1% 0603, resistance R118 use 200K 1%0603, resistance R119 to use 14.3K 1%0603, electric capacity C61, electric capacity C62, electric capacity C43 and electric capacity C46 uses 100NF 10%0603, electric capacity C100 to use 100PF 5%0603, electric capacity EC8 to use 100UF/ 25V/WL 6.3*11, diode D10 uses SS14DO-214AC.Inductance L1 is WQPIG4018-220M.

Built-in relay drive circuit includes the tripping operation drive circuit and combined floodgate drive circuit that mirror image is set, and close a floodgate driving electricity Road is that built-in on-load switch control signal RELAY-ON and resistance R52, NPN triode V5 ground level are sequentially connected, NPN triode V5 base stage is also connected with resistance R54 one end, and the other end ground connection of the resistance R54, NPN triode Q3 colelctor electrodes connection is closed a floodgate NPN triode V6 emitter stages in signal RYA output ends, NPN triode V5 emitter stages and tripping operation drive circuit are altogether.Tripping operation is driven Dynamic circuit is that built-in on-load switch control signal RELAY-OFF and resistance R53, NPN triode V6 ground level are sequentially connected, NPN Triode V6 base stage is also connected with resistance R55 one end, and the other end ground connection of the resistance R55, NPN triode V6 colelctor electrodes connect Connect trip signal RYB output ends.Built-in relay drive circuit also includes interlock protection circuit, and interlock protection circuit includes PNP Triode V3 and PNP triode V4, the PNP triode V3 colelctor electrodes, PNP triode V4 colelctor electrodes respectively with switching signal RYA output ends, the connection of trip signal RYB output ends, the PNP triode V3 emitter stages, the connection of PNP triode V4 emitter stages are supplied Resistance R16, PNP triode V4 bases are connected between power supply ZB 12V, PNP triode V3 base stage, PNP triode V4 colelctor electrodes Resistance R14 is connected between pole, PNP triode V3 colelctor electrodes, between the PNP triode V4 emitter stages, PNP triode V4 base stages Connect a resistance R33；Power supply ZB 12V are also connected with double diode V1 negative poles, double diode V1 negative poles, double diode V1 Positive pole, double diode V2 plus earths, double diode V1 middle pins are connected with switching signal RYA output ends, double diode V2 Middle pin is connected with trip signal RYB output ends.J3 is the converting interface for connecing table inside micro magnetic latching relay, is needed for design It may need separately to set small plank and patch in the motherboard.RYA switching ons signal output to electric energy off-balancesheet on-load switch.R33 is Biasing resistor, signal control.

ZB is the meaning of carrier wave in this programme, and built-in on-load switch control signal RELAY-ON inputs for energization control signal End, built-in on-load switch control signal RELAY-OFF is tripping operation control signal input, energization control signal input, tripping operation 44th pin of control signal input and MCU chip, the connection of 45 pin, MCU chip by signal by energization control signal input, Tripping operation control signal input is input to built-in relay drive circuit, the QA of switching signal RYA output ends, trip signal RYB The QB of output end is connected load switching signal line interface.Built-in relay drive circuit controls circuit, built-in on-load switch control Signal RELAY-ON and RELAY-OFF processed is control signal of closing a floodgate or trip, and is exported respectively by the 44th of single-chip microprocessor MCU the, 45 pin To built-in relay drive circuit.

External switch is connected with switching signal output end RYA, built-in on-load switch control signal RELAY-ON and resistance R52, NPN triode V5 ground level are sequentially connected, and NPN triode V5 base stage is also connected with resistance R54 one end, the resistance R54 other end ground connection, NPN triode Q3 colelctor electrodes connection switching signal output end RYA, NPN triode V5 emitter stage are altogether. Double diode V1, double diode V2 select LBAV99L11G, and PNP triode V3, PNP triode V4 select LMBT2907ALTIG, NPN triode V5, NPN triode V6 select LBC817-40LT1G, and resistance R52, resistance R53 select the models of 2K 5%0603, electricity Hinder R54, resistance R55 and select the models of 22K 1%0603, resistance R14, resistance R16, resistance R33 select 4.7K 1%0603, resistance This Chip-R of R33 does not weld to be built-in.

Tripping operation alarm drive circuit is set using buzzer, and PNP triode Q7 emitter stages connect the pole of operating voltage VDD, PNP tri- It is connected after pipe Q7 base stages, resistance R99 connections with buzzerphone end BEEP, PNP triode Q7 colelctor electrodes are connected with buzzer positive pole, Buzzer negative pole is grounded.Buzzerphone end BEEP and the 29th pin of MCU chip are connected in the circuit.MCU chip sends control letter Number give buzzer.R99 selects 3K 5%0603, PNP triode Q7 to select LMBT2907ALTCG SOT-23 models, buzzer choosing Use BZ1YMD-12095-G buzzers.

Relay test circuit be in optocoupler OPT8 the positive pole of light emitting diode, negative pole respectively with pad LOUT, resistance R71 Connection, external diode D6 between the positive pole of light emitting diode, negative pole in optocoupler OPT8, resistance R1, resistance R21 are between the two Node is connected with the colelctor electrode of phototriode in optocoupler OPT8, the grounded emitter of phototriode, resistance in optocoupler OPT8 R68, resistance R69, resistance R70, resistance R71 are sequentially connected in series.Resistance R68, resistance R69, resistance R70, resistance R71 select 360K 1%0805, resistance R1 select 51K 5%0603, resistance R1 to select 100R 5%0603, diode D6 to select M7DO 214AC, Opto-coupler chip OPT8 selects 816D models.74th pin RelayTest of MCU chip is built-in relay or external relay detection Signal input, tripping operation, closing success are judged whether for detecting, what this mode made a decision in the form of a voltage.Also one Kind judged in the form of power, be MCU obtains from the communication interface 12 of computation chip, 13 pin.Both modes can be distinguished Or be used in conjunction with.Resistance R68- resistance R71 upper-lower positions, which stagger, to be put, and is conducive to by EMC test, dry with eliminating Disturb the effect of signal.It is larger that multiple resistant series play a part of voltage in partial pressure, circuit, single or a few resistor power Limited, there is partial pressure protective resistance to be hardly damaged.

External relay drive circuit CTRL pads connect soldering opening and are connected respectively with switch S3, switch S4, switch S3, switch S4 connects 3 pin of the soldering opening respectively with relay RLY1,5 pin and is connected；Diode D1 is coupled between relay RLY1 1 pin, 2 pin, Switching signal RYA is exported from 2 pin, circuit two ends resistance R1, resistance R2 in parallel respectively with positive supply+12V, relay RLY1 1 pin is connected；Relay RLY1 4 pin are connected respectively with thermistor RT1, thermistor RT2, and thermistor RT2 two ends also connect There is thermistor RT3.73rd pin Relay Ctrl output control signals RelayCtrl of MCU chip give relay RLY1, relay Device RLY1 is controls the midget relay of external on-load switch, and control signal RelayCtrl is external switch output tripping operation pulse Or level signal input midget relay HF33F, diode D1 select M7DO-214AC, resistance R1, resistance R2 select 100R 5%0805, thermistor RT1, thermistor RT2 are MZ11-08E600-121RM, and thermistor RT3 is 100K/1W.In figure 12V power supplys are output in DC/DC change-over circuits.It is larger that electric current in shunting action, circuit is played in resistance R1, R2 parallel connection, single electricity Power limited is hindered, shunting is hardly damaged with protective resistance.Switch S3, switch S4 connect soldering opening, when the electric energy meter is that switch is outer S3, S4 short circuit scolding tin are even burn-on when putting table.

Battery Switching power circuit includes lithium battery BT1, and lithium battery BT1 positive pole is connected with resistance R18 one end, lithium battery BT1 negative pole is connected with soldering opening S1 one end, soldering opening S1 other ends ground connection.63 pin of another termination MCU chips of resistance R18. The battery Switching power circuit is that MCU chip and clock chip provide power supply when in mains failure.S1 is connection welding Mouthful, it is also battery power consumption detection mouth, prevents that power circuit power consumption is excessive and makes battery too short, is to differentiate that electric energy meter is good Or bad test point.Lithium battery BT1 uses the 3.6V lithium batteries of EV 14250, and resistance R18 uses 5.1R 1%0603.

Key circuit includes circulation display button circuit, detection key circuit of uncapping, and circulation display button circuit includes the 1st The button KEY2 of pin ground connection, button KEY2 4 pin are connected respectively with resistance R8, resistance R41, electric capacity C3, electric capacity C3 ground connection, resistance R8 is connected with the pin VDDPI of MCU chip 66.Detection key circuit of uncapping includes uncap detection button KEY1, detection button of uncapping KEY1 2 pin, 5 pin are grounded respectively, and 6 pin for the detection button KEY1 that uncaps are connected respectively with resistance R11, resistance R6, resistance R11, Node between resistance R6 is connected with electric capacity C5 one end, electric capacity C5 other ends ground connection, the resistance R11 and pin VDDPI of MCU chip 66 Connection.Resistance R41 is connected with the pin of MCU chip 50, and resistance R6 is connected with the pin of MCU chip 51.Namely low level state under normality, Uncap the 1st pin, 2 pin and the 5th pin in detection button KEY1,6 pin are turned on.Resistance R8 selects 300K 5%0603, resistance R41 choosings With 100R 5%0603, electric capacity C3 selects 100NF 10%0603, button KEY2 from TSTP6650-250BH-9.0 6 × 6 × 5MM models, resistance R11 selects 3M 5%0603, resistance R6 to select 100R 5%0603, electric capacity C5 to select 100NF 10% 0603.Button KEY2 is pressed and generation after release is low, high level signal input MCU chip.Series resistor R8 between power supply and ground, Electric capacity C3, its this isolation decoupling effect, entirely one high-pass filtering structural circuit of composition, can be filtered through the high frequency that power supply is sealed in Harmonic signal, so that switch KEY2 obtains purer smooth power supply, has been mainly buffer action, the electricity for making it power herein Road and other circuit will not be produced because sharing a power supply unnecessary to be contacted or resonating.Resistance R11, electric capacity C5 play phase Same-action.

It is clock chip U7 that clock chip circuit, which includes, and clock chip U7 2 pin, 13 pin, 6 pin connect data processor respectively 19 pin, 20 pin, 66 pin, 6 pin of the clock chip U7 are grounded after being connected with electric capacity C7, clock chip U7 the 10th pin and electricity Hinder R13 connections.The clock that clock chip U7 uses RN8025T, MCU to be data processor is internal clocking, RN8025T clock For external clock, principle is the same.External clock chip has temperature compensation function, relative accurate.When internal clocking and outside When clock ratio relatively differs greatly a little, MCU is defined by external clock and carries out check and correction amendment.Both are best with reference to being only, because MCU Internal clocking is easily in particular cases produced large change very much by ambient temperature, electromagnetic interference, such as slack-off or accelerate, Even clock entanglement.It is clock chip U7 that clock chip circuit, which includes, and 2 pin of the clock chip U7,13 pin, 6 pin connect respectively 19 pin of data processor, 20 pin, 66 pin, 6 pin of the clock chip U7 are grounded after being connected with electric capacity C7.Clock chip U7 is selected 8025T SOP-14, electric capacity C7 is used to select 100NF 10%0603, resistance R13 to select 1K 5%0603.

Electric energy meter is additionally provided with standby clock chip U2, and 1 pin of the clock chip U2,8 pin, 3 pin connect data processing respectively 19 pin of device, 20 pin, 66 pin.(i.e. in Figure 12 shown in right side) is then used if U7 clock chips RN8025T is if U2, it is therefore an objective to prevent U7 clock chips because cost is too high or supply shortage etc. cause specific.

Data storage circuitry is internal storage, using memory chip U5, memory chip U5 the 1st pin, 2 pin, 3 Pin, 4 pin, 6 pin ground connection, external capacitor C12 between memory chip U5 the 1st pin and 8 pin, the 66th pin of MCU chip respectively with Memory chip U5 the 8th pin, resistance R2, resistance R3 connections, the node between memory chip U5 the 6th pin and resistance R3 connect 19th pin of MCU chip, the node between memory chip U5 the 5th pin and resistance R2 connects the 20th pin of MCU chip.Memory Chip U5 uses EEPROM (EEPROM), FM24C512D SOP8 models.Electric capacity C40 uses 100NF 10%0603, resistance R3, resistance R2 use the models of 5.1K 5%0603.In electric capacity C40, resistance R2, resistance R3, resistance is biasing Resistance, electric capacity strobes.

Master data processor is connected with liquid crystal display and backlight drive circuit, the liquid crystal display and backlight drive circuit bag Include liquid crystal display LCD1 and transistor BG1,24-29 pin and the 3-8 pin of MCU chip are connected, liquid crystal display LCD1 is used SDH-m11218s03-HP4 (26mm) lcd drive chip, the transistor BG1WR81063031WH0 111MDK-6431W1A0 back ofs the body Light, resistance R42 is connected with light emitting diode positive pole in transistor BG1, light emitting diode negative pole and MCU chip the in backlight chip 46 pin are connected.Resistance R42 current limliting supplying resistances, play voltage, electric current and power match or the BG1 effects of protection chip.

Telecommunication circuit is infrared communication circuit, RS485 communicating circuits, carrier communication interface circuit.Infrared communication circuit bag Infrared transtation mission circuit and infrared receiving circuit are included, infrared receiving circuit includes IR signal reception pipe IR1, IR signal reception pipe The pin of IR1 the 1st meet 17 pin of MCU chip, electric capacity C42, and IR signal reception pipe IR1 3 pin and resistance R75, electric capacity C41 connect respectively Connect, resistance R75 meets voltage VDD, electric capacity C42, electric capacity C41, IR signal reception pipe IR1 2 pin are all grounded.Infrared transtation mission circuit It is connected including infrared signal transmitting tube IR2, operating voltage VDD with PNP triode Q2 emitter E, PNP triode Q2 current collection Pole C is connected respectively with resistance R79, R78, and the node between resistance R79, R78 is connected with infrared signal transmitting tube IR2 positive poles, red External signal transmitting tube IR2 negative poles are grounded, and PNP triode Q2 base stages B, resistance R80, the 18th pin of MCU chip are sequentially connected.It is infrared Signal reception pipe IR1 uses HM638R-L-W W0038HL-26-30HS138M-W models, and resistance R75 uses 51R 5%0603, Electric capacity C4110UF 10%0805 16V X5R, electric capacity C42 use 1000PF 10%0603.Infrared signal transmitting tube IR2 is used VAT205HS205L5IR5-45 models, resistance R80 is that base electrode current-limiting resistance uses the models of 2K 5%0603, PNP triode Q2 Using 2SA812SOT-23 models.Electric capacity C41, electric capacity C42 act as isolation move back occasionally blocking circulation AC influence signal to count Word, play filter action.Infrared signal transmitting tube IR2 plays transmission signal effect.Resistance R79, R78 parallel connection is played shunting and made With electric current is larger in circuit, and single resistor power is limited, and shunting is hardly damaged with protective resistance.Operating voltage VDD is by electricity The place circuit conversion of chip IC 4 or the place circuit conversion of chip IC 3 in the DC/DC change-over circuits of source.

RS485 communicating circuits include optocoupler OPT1, optocoupler OPT2, RS485 chip U4, signal receiving end RX485 and resistance Transistor collector in R89 one end, optocoupler OPT1 is connected respectively, another termination operating voltage VDD, optocoupler OPT1 of resistance R89 Interior transistor emitter ground connection；Light-Emitting Diode positive pole in optocoupler OPT1 is connected with resistance R90 one end, and resistance R90 connects electricity The Light-Emitting Diode negative pole in V485, optocoupler OPT1 is pressed to be connected with RS485 chips U4 1 pin；

Signal sending end TX485 is connected respectively with the Light-Emitting Diode negative pole in resistance R17 one end, optocoupler OPT2, optocoupler The phototriode colelctor electrode that Light-Emitting Diode positive pole in OPT2 is connect in voltage VDD, optocoupler OPT2 meets voltage V485, optocoupler Phototriode emitter stage in OPT2 is connected with the pin of RS485 chips U4 the 2nd, 3 pin, resistance R4 one end；RS485 chips U4 the 6th Pin, 7 pin are connected with RS485 signal plugs or pin interface 485B, 485A respectively；Connect between the pin of RS485 chips U4 the 8th, 6 pin Connect and a resistance R93 is connected between 7 pin of resistance R92, a RS485 chip U4,5 pin.

RS485 communicating circuits also include protection circuit, and the protection circuit is by transition diode TVS1 and thermistor RT2 Composition, the pin of transition diode TVS1, a RS485 chip U4 the 6th and signal plug are connected between RS485 chips U4 6 pin, 7 pin Or a thermistor RT2 is connected between pin interface 485A.Transition diode TVS1 can be sparked, and thermistor RT2 is used When the attack, such as patching operations of extraneous 220V-420V alternating currents is prevented or user deliberately and thunder and lightning attack, protection circuit rise The effect of protection RS485 chips U4, MCU chip and interlock circuit.

Optocoupler OPT1, optocoupler OPT2 use 816D models, and RS485 chips U4 uses AZRS485-BL3085A SOP3, electricity Hindering R89, resistance R90, resistance R4, resistance R17 selects 510R 5%0603, resistance R91 to select 1K 5%0603, resistance R92, electricity Resistance R93 is not welded from 20K 5%0603, and thermistor RT2 selects MZ11-0904300-600RM 109A, transition diode TVS1 selects SMBJ6.0CA SMB/DO-214AA wink thunder models.

RS485 is sent and differential received using balance, therefore the ability disturbed with suppression common mode.Plus bus transceiver With high sensitivity, as little as 200mV voltage can be detected, therefore transmission signal can be normally received beyond km.RS485 Using half-duplex operation, whenever can only have and a little be in transmission state, therefore, transtation mission circuit must be added by enable signal It is very convenient when RS485 is for multi-point interconnection to control, many signal wires can be saved.The antijamming capability of RS485 signals compared with By force, it is simple in construction, cheap, the advantages of communication distance is remote.

Carrier communication interface circuit includes the interface circuit centered on double-row needle carrier interface J2, double-row needle carrier interface J2 2 pin, resistance R31 connections are followed by the pin of MCU chip 38；Double-row needle carrier interface J2 3 pin are distinguished with resistance R48, resistance R50 Connection；Double-row needle carrier interface J2 4 pin are connected with resistance R30, and double-row needle carrier interface J2 5 pin are connected with resistance R29, double Row's pin carrier interface J2 8 pin are connected respectively with resistance R34, resistance R49；Double-row needle carrier interface J2 12 pin and electricity in parallel Hold and be grounded after C19, electric capacity C21 connections.Resistance R50 connects the pin of MCU chip the 35th, and resistance R30 connects the pin of MCU chip the 36th, resistance R29 The pin of MCU chip the 40th is connect, resistance R49 connects the pin of MCU chip the 39th.The jack interface J1 of carrier module, directly connects the live wire of civil power And zero line, i.e. low voltage power line carrier signalling channel.The double-row needle carrier interface J2 of carrier module connects MCU chip.Resistance R29, Resistance R30, resistance R31, resistance R49, resistance R50 select 100R5%0805, and resistance R48, resistance R34 select 5.1K 5% 0805, electric capacity C19, electric capacity C21 select 10UF 10%080516V X5R.

Signal circuit includes power test pulse signal transmission circuit, multifunctional signal transmission circuit, RS485 signals Transmission circuit, power test pulse signal transmission circuit is included in optocoupler OPT3, optocoupler OPT7, resistance R38 and optocoupler OPT7 Light emitting diode positive pole is connected, and the light emitting diode negative pole in optocoupler OPT7 connects digitally, the phototriode in optocoupler OPT7 Colelctor electrode connects phototriode emitter stage connecting resistance R47 one end in operating voltage VDD, optocoupler OPT7, another terminations of resistance R47 Phototriode emitter stage in simulation ground, optocoupler OPT7 is connected with the pin of MCU chip the 27th；The pin of MCU chip the 28th and resistance Light emitting diode negative pole in R76, optocoupler OPT3 is sequentially connected, and the light emitting diode positive pole in optocoupler OPT3 connects operating voltage, The colelctor electrode of phototriode in optocoupler OPT3, emitter stage are connected to electric energy meter calibrating lead-out terminal.Computation chip electrical energy pulse AP is transferred to the 27th pin CF IN of MCU chip by optocoupler OPT7, by after MCU scaling down processings by MCU chip 68 pin CPLL Output, then is transmitted to optocoupler OPT3 front end, all the way to electrical energy pulse indicator lamp LED3, all the way to exporting to plug receptacle after optocoupler Or electric energy meter calibrating lead-out terminal.

Multifunctional signal transmission circuit includes light emitting diode negative pole in optocoupler OPT4, resistance R43 and optocoupler OPT4 and is connected, Light emitting diode positive pole connects the colelctor electrode of phototriode in operating voltage VDD, optocoupler OPT4, emitter stage connection in optocoupler OPT4 Electric energy meter pulse per second (PPS) or period switching pulse output terminal.Test pulse (the clock pulse per second (PPS)/period switching arteries and veins of Multifunctional mouth Punching) exported by MCU 79 pin TM, its pulse pattern exported is by RS485 mouthfuls of input order controls.

RS485 signal circuits include optocoupler OPT5, optocoupler OPT6, data receiver serial ports M RX and resistance R28, electric capacity The colelctor electrode of phototriode is connected respectively in C53, optocoupler OPT5, and resistance R28 connects photosensitive three pole in voltage DVDD, optocoupler OPT5 Light emitting diode positive pole connects light emitting diode in voltage VDD, optocoupler OPT5 in the emitter stage of pipe, electric capacity C53 ground connection, optocoupler OPT5 Negative pole, resistance R36, the pin MIC TX of MCU chip the 14th are sequentially connected；Data send light-emitting diodes in serial ports M TX and optocoupler OPT6 Pipe negative pole is connected, and is connected after voltage DVDD connecting resistances R37 with light emitting diode positive pole in optocoupler OPT6, photosensitive three in optocoupler OPT5 The colelctor electrode of pole pipe is connected respectively with resistance R46 one end, electric capacity C28 one end, the pin MIC RX of MCU chip the 13rd, and resistance R46 is another The emitter stage of phototriode, electric capacity C28 other ends ground connection in termination voltage VDD, optocoupler OPT5.Data receiver serial ports M RX, Data transmission serial ports M TX and the digital serial port the 14th of MCU chip, 13 pin M TX, M RX connect by optocoupler OPT5, optocoupler OPT6 Connect, optocoupler plays a part of forceful electric power and light current isolation.Optocoupler OPT3, optocoupler OPT7, optocoupler OPT5, optocoupler OPT6, optocoupler OPT4 Using 816D models, resistance R76, resistance R43, resistance R28, resistance R46, resistance R38, resistance R47 use 2K 5%0603, R36, R37 use 1K 5%0603, and electric capacity C35, electric capacity C28 select 20PF 5%0603.

Electrical energy pulse indicating circuit and indicating circuit of operating a switch is resistance R44, LED 2, the pin of MCU chip the 77th Connection, resistance R51, LED 3, the connection of the pin of MCU chip the 28th, power vd D and resistance R51, resistance R44 connect respectively Connect.Resistance R44, resistance R51 select 2K 5%0603, and LED 2 is from WZY5034D-3.3/ED LT1831-81- 81 φ of M1 5 are yellow, and LED 5 is red from 81 φ 5 of WZY5034D-3.3/ED LT1831-81-M1.Light emitting diode The bright orange light of LED2, the azarin light of LED 5.

IC-card interface is additionally provided with master data processor, the IC-card interface is connected with CPU card card seat circuit.CPU card card Seat circuit includes CARD1 Wiring ports, and operating voltage VDD is sequentially connected with the pin of resistance R101, CARD1 Wiring port the 1st. CARD1 Wiring ports the 2nd, 3,4,5 pin difference connecting resistance R102 one end, resistance R103 one end, resistance R104 one end, resistance R105 one end, the resistance R102 other ends, the resistance R103 other ends, the resistance R104 other ends, the resistance R105 other ends respectively with MCU 43 pin of chip, 70 pin, 41 pin, the connection of 69 pin, the resistance R105 other ends are grounded after being connected with electric capacity C64；CARD1 Wiring ports The 6th pin ground connection.The pin of card inserting mouth CARD the 1st connect thermistor RT5 one end, the thermistor RT5 other ends respectively with CUP card power supplys CAEDVCC, transition diode TVS2 (title is repeated with 485, is changed to TVS2) connection, transition diode TVS2 ground connection；Card inserting mouth The pin of CARD the 2nd are connected with thermistor RT4 one end, the thermistor RT4 other ends and voltage-regulator diode ZD4 negative pole, CARDRST Port is connected, voltage-regulator diode ZD4 plus earths；The pin of card inserting mouth CARD the 3rd are connected with thermistor RT3 one end, thermistor The RT3 other ends and voltage-regulator diode ZD3 negative pole, CARDCLK ports are connected, voltage-regulator diode ZD3 plus earths；Card inserting mouth The pin of CARD the 6th are connected with thermistor RT6 one end, the thermistor RT6 other ends and voltage-regulator diode ZD1 negative pole, CARDIO Port is connected, voltage-regulator diode ZD1 plus earths；The pin of card inserting mouth CARD the 9th are connected with thermistor RT2 one end, thermistor The RT2 other ends and voltage-regulator diode ZD2 negative pole, CARDKEY ports are connected, voltage-regulator diode ZD2 plus earths；Thermistor RT2, thermistor RT3, thermistor RT4, thermistor RT5, thermistor RT6 use semistor PTC, Voltage-regulator diode ZD1, voltage-regulator diode ZD2, voltage-regulator diode ZD3, voltage-regulator diode ZD4 use 5.5V sizes, the pole of transition two Pipe TVS2 uses P6SMB6.0CA.Transition diode is TVS1, is connect digitally, with MCU chip altogether.

In above-mentioned figure, the name identification pin name corresponding with MCU chip U1 each schemed in corresponding wiring is corresponding Connection.SCL ends in such as data storage circuitry figure are connected with the 19th pin SCL of MCU chip in governor circuit figure, data storage electricity VDDPI ends in the figure of road are connected with the 66th pin VDDPI of MCU chip in governor circuit figure.

It is above the preferred embodiment of the present invention, protection scope of the present invention is not limited, for people in the art Deformation and improvement that member makes according to the mentality of designing of the present invention, should all be considered as within protection scope of the present invention.

Claims (10)

1. a kind of single-phase charge-controlled intelligent electric meter, including master data processor, it is characterised in that set on the master data processor There are communication interface, the master data processor and LCD display, button, clock/battery module, internal storage, integrating metrology Chip, power circuit, module for anti-fraudulent connection；The integrating metrology chip and voltage branch circuit, current sampling circuit, power supply Circuit is connected respectively；The master data processor exports test pulse；The communication interface is connected with telecommunication circuit.

2. single-phase charge-controlled intelligent electric meter according to claim 1, it is characterised in that the current sampling circuit includes single Phase firewire current sampling circuit and single-phase neutral line current sample circuit, single-phase live wire current sampling circuit are the two of manganese copper diverter Individual output end is connected with resistance R56 one end, resistance R57 one end respectively, and resistance R56 one end, resistance R57 are connected to resistance between one end Electric capacity C31, the electric capacity C32 of series connection, electric capacity C31, electric capacity C32 are connected between R61, resistance the R56 other end, the resistance R57 other ends Connect simulation ground；Single-phase neutral line current sample circuit for current transformer two output ends respectively with resistance R63 one end, resistance R66 one end is connected, and the resistance R64, resistance R65, the R63 other end, electricity of series connection are connected between resistance R63 one end, resistance R66 one end Electric capacity C33, the electric capacity C34 of series connection are connected between the resistance R66 other ends.

3. single-phase charge-controlled intelligent electric meter according to claim 1, it is characterised in that the voltage branch circuit is to be connected on Resistance R81, resistance R82 on zero line, resistance R83, resistance R84, resistance R85, resistance R86, resistance R87, resistance R88 go here and there successively Connection；It is connected with resistance R74, resistance R23 to the simulation being connected on live wire, resistance R74 two one electric capacity C39 of termination, resistance R23's Two one electric capacity C38 of termination.

4. single-phase charge-controlled intelligent electric meter according to claim 1, it is characterised in that shown clock/battery module includes Battery Switching power circuit, clock chip circuit, the master data processor, battery Switching power circuit, clock chip circuit Both any interconnections in three, the clock chip circuit uses RN8025T models.

5. single-phase charge-controlled intelligent electric meter according to claim 1, it is characterised in that the master data processor also with it is interior Relay drive circuit, tripping operation alarm drive circuit, relay test circuit, external relay drive circuit is put to connect respectively.

6. single-phase charge-controlled intelligent electric meter according to claim 1, it is characterised in that the power circuit is live wire L lines A piezo-resistance RR1 is concatenated between zero line N lines, piezo-resistance RR1 two ends connect the pin of primary coil the 5th of transformer, 1 respectively Pin, is further connected with thermistor RT1 between piezo-resistance RR1 and 1 pin；The pin of transformer the 4th, 5 pin connect voltage stabilizing core respectively Piece IC2 the 3rd pin, 2 pin, are connected to diode D4, voltage stabilizing chip between the 4th pin of primary coil and voltage stabilizing chip IC2 the 3rd pin Electric capacity EC4 parallel with one another, electric capacity C58, wherein electric capacity EC4 positive pole and voltage stabilizing chip are circumscribed between IC2 the 3rd pin, 2 pin IC2 the 3rd pin connection, electric capacity EC4 negative pole is connected with voltage stabilizing chip IC2 the 2nd pin, voltage stabilizing chip IC2 the 1st pin and 2 pin Between be circumscribed with parallel connection electric capacity EC5, electric capacity C60, the node between electric capacity EC5 negative pole and electric capacity C60 connect the earth, electric capacity Node output second voltage DVDD between EC5 positive pole and electric capacity C60；The pin of transformer secondary coil the 6th, 7 pin connect respectively Rectifier bridge stack BD1 the 3rd pin, 4 pin, rectifier bridge stack BD1 the 1st pin, 2 pin positive pole respectively with electric capacity EC1, negative pole are connected, electricity Hold EC1 positive pole output front voltage VDCC；The pin of transformer secondary coil the 9th, 10 pin connect voltage stabilizing chip IC1 the 3rd pin respectively Vin, 2 pin GND, are connected to diode D3 between the pin of secondary coil the 9th and voltage stabilizing chip IC1 the 3rd pin Vin, voltage stabilizing chip IC1's External electric capacity EC3 in parallel, electric capacity C44 between 3rd pin, 2 pin, wherein electric capacity EC3 positive pole and voltage stabilizing chip IC1 the 3rd pin Connection, electric capacity EC3 negative pole is connected with voltage stabilizing chip IC1 the 2nd pin, external electricity between voltage stabilizing chip IC1 the 1st pin and 2 pin Hold C51, output voltage V485 between voltage stabilizing chip IC1 the 1st pin and electric capacity C51, for being powered to 485 communicating circuits；Two poles Output voltage+12V485 between pipe D3 and voltage stabilizing chip IC1 the 3rd pin.

7. single-phase charge-controlled intelligent electric meter according to claim 1, it is characterised in that the front voltage VDCC and power supply DC/DC change-over circuits are connected, and the power supply DC/DC change-over circuits include the first change-over circuit, the second change-over circuit and the 3rd turn Circuit is changed, first change-over circuit includes amplifier chip IC4, resistance R110, resistance R111, electric capacity C8, inductance L2, circuit Front voltage VDCC and resistance R110, amplifier chip IC4 the 4th pin are sequentially connected, resistance R110 input and amplifier Node between the pin of chip IC 4 the 5th connects electric capacity C52 one end, electric capacity C52 other ends ground connection, the pin of amplifier chip IC4 the 6th, two Node of the node with electric capacity C8, inductance L2 between the two between pole pipe D7 negative pole is connected with each other, amplifier chip IC4 the 1st Pin is sequentially connected with resistance R111, electric capacity C8, inductance L2 inputs, the pin of amplifier chip IC4 the 2nd ground connection, inductance L2 inputs It is connected with diode D7 negative pole, inductance L2 output ends, diode D7 positive pole series resistor R112, resistance between the two R113, resistance R112, the nodes of resistance R113 between the two are connected with the pin of amplifier chip IC4 the 3rd, diode D7 positive pole with Node ground connection between resistance R113, the node output services voltage VDD between inductance L2 output ends and resistance R112, electrolysis electricity Hold EC2 and electric capacity C50 and be arranged in parallel the circuit on one side to be formed and connect node between inductance L2, resistance R112, electrochemical capacitor EC2 and Electric capacity C50 is arranged in parallel the circuit other end to be formed ground connection, and electrochemical capacitor EC2 positive pole is connected with resistance R112；Second conversion Circuit includes resistance R114, resistance R115, amplifier chip IC5, resistance R117, resistance C43, inductance L1, resistance R112, resistance R113 and diode D7, front voltage VDCC and resistance R114, resistance R115, amplifier chip IC5 the 4th pin are sequentially connected, The node of resistance R114 and amplifier chip IC5 the 5th pin between the two is connected with electric capacity C62 one end, C62 other ends ground connection； The node and electric capacity C43, the nodes of inductance L1 between the two of the pin of amplifier chip IC5 the 6th, diode D10 negative poles between the two It is connected with each other, the pin of amplifier chip IC4 the 1st are sequentially connected with resistance R117, electric capacity C43, inductance L1, inductance L1 and diode Resistance R118, R119, the pin GND of amplifier chip IC5 the 2nd ground connection, resistance R118, resistance R119 two are serially connected between D10 positive poles Node between person is connected with the pin of amplifier chip IC5 the 3rd, and resistance R119, electric capacity C46, diode D10 are grounded, inductance L1 Node between resistance R112 exports the second operating voltage ZB12V；3rd change-over circuit includes voltage stabilizing chip IC3, front end electricity Pressure VDCC is connected with the voltage stabilizing chip IC3 pin of input 3, the voltage stabilizing chip IC3 pin of earth terminal 2 ground connection, and voltage stabilizing chip IC3's is defeated Go out 1 pin output services voltage VDD of end.

8. single-phase charge-controlled intelligent electric meter according to claim 1, it is characterised in that the telecommunication circuit is infrared communication Circuit, infrared receiving circuit, infrared receiving circuit are connected with MCU data processors respectively, and the infrared receiving circuit includes red External signal reception pipe IR1, IR signal reception pipe IR1 the 1st pin connect electric capacity C42 one end, the pin of IR signal reception pipe IR1 the 3rd with Resistance R75 one end, electric capacity C41 one end are connected respectively, another termination operating voltage VDD of resistance R75, the electric capacity C42 other ends, electric capacity The C41 other ends, the pin of IR signal reception pipe IR1 the 2nd are all grounded；Infrared transtation mission circuit includes infrared signal transmitting tube IR2, work Voltage VDD is connected with PNP triode Q2 emitter stage, and PNP triode Q2 colelctor electrode is connected respectively with resistance R79, R78, electricity Node between resistance R79, R78 is connected with infrared signal transmitting tube IR2 positive poles, infrared signal transmitting tube IR2 negative poles ground connection, PNP Triode Q2 base stages, resistance R80 are sequentially connected.

9. single-phase charge-controlled intelligent electric meter according to claim 7, it is characterised in that the telecommunication circuit also includes RS485 communicating circuits and/or carrier communication interface circuit, the RS485 communicating circuits include optocoupler OPT1, optocoupler OPT2, Transistor collector in RS485 chip U4, signal receiving end RX485 and resistance R89 one end, optocoupler OPT1 is connected respectively, electricity Transistor emitter in resistance R89 another termination working power VDD, optocoupler OPT1 connects simulation ground；Luminous two in optocoupler OPT1 Level pipe positive pole is connected with resistance R90 one end, and resistance R90 connects Light-Emitting Diode negative pole and RS485 in power supply V485, optocoupler OPT1 The pins of chip U4 the 1st are connected；Signal sending end TX485 distinguishes with the Light-Emitting Diode negative pole in resistance R17 one end, optocoupler OPT2 The phototriode colelctor electrode that Light-Emitting Diode positive pole in connection, optocoupler OPT2 is connect in working power VDD, optocoupler OPT2 connects electricity Phototriode emitter stage in source V485, optocoupler OPT2 is connected with the pin of RS485 chips U4 the 2nd, 3 pin, resistance R4 one end, The pin of RS485 chips U4 the 4th are connected with resistance R91 one end, another terminating systems power supply of the resistance R4 other ends, resistance R91； RS485 chips U4 the 8th pin, the 5th pin with connecing power supply V485, system power supply respectively, the pin of RS485 chips U4 the 6th, 7 pin respectively with RS485 signal plugs or the connection of pin interface 485B, 485A；A resistance R92 is connected between the pin of RS485 chips U4 the 8th, 6 pin, A resistance R93 is connected between the pin of RS485 chips U4 the 7th, 5 pin；Transition diode TVS1 and thermistor RT2 compositions, RS485 Connect a transition diode TVS1 between the pin of chip U4 the 6th, 7 pin, the pin of RS485 chips U4 the 6th and signal plug or draw A thermistor RT2 is connected between pin interface 485A.

10. single-phase charge-controlled intelligent electric meter according to claim 1, it is characterised in that the signal circuit includes Power test pulse signal transmission circuit, multifunctional signal transmission circuit, RS485 signal circuits, the power test arteries and veins Signal circuit, multifunctional signal transmission circuit, RS485 signal circuits is rushed to be connected with MCU data processors respectively.