CN2496029Y - Uniphase intelligence card electric meter - Google Patents

Abstract

The utility model discloses a uniphase intelligence electric card meter and consists of a sampling circuit, a measuring circuit, a control circuit, a display circuit, an execution circuit, a cassette, an integrated circuit card that is corresponding with the cassette and the DC supply circuit of the above circuits. The control circuit consists of a single chip, a reset chip and a safety control module SAM, the integrated circuit card is a CPU card, the safety control module SAM and the inside mask of the CPU are provided with an operation system TIME-COS2.0. The common password key in the safety control module SAM that are known by the manufacturers is changed into password key that are set by the electricity supply departments by changing the main password key after leaving the factory by the means of DES encrypt. The single chip read the content of the safety control module SAM and finishes the authentication of the password key through P4 port. The utility model can measure the consumed electricity of consumers, realize pre-payment and has high confidential.

Description

Single-phase intelligent card electric energy meter

Technical field

The utility model relates to single-phase pre-payment integrated circuit card electric energy meter.

Background technology

The old-fashioned electric energy meter that tradition is used can only be paid the fees to power supply management department by the user according to user's power consumption, pays the fees after the just first electricity consumption, and its drawback is: 1, easily cause not paying or stagnant paying of the electricity charge; 2, when the user need stop power supply because of the unpaid electricity charge, can not cut off the power supply automatically.In recent years, released single-phase pre-payment electric energy meter on the market successively, its circuit structure comprises the power supply of metering section, control module, display part, topworks, integrated circuit card and foregoing circuit, integrated circuit card wherein mostly is storage card, also the logic encryption card of minority is arranged, the former deficiency is to maintain secrecy, the latter's deficiency is that privacy degrees is low, and password is to be grasped by manufacturer, and power supply management department does not grasp.

Summary of the invention

The purpose of this utility model provides the single-phase intelligent card electric energy meter that a kind of privacy degrees height, password are grasped by power supply management department.

This single-phase intelligent card electric energy meter, comprise sample circuit, metering circuit, control circuit, display circuit, the power on/off executive circuit, deck, DC power-supply circuit with the corresponding integrated circuit card of deck and above-mentioned each circuit, metering circuit comprises computation chip, be connected to current sampling circuit between the current sample input end of this computation chip and the ac power supply line live wire end, be connected to voltage sampling circuit between voltage sample input end and the zero line, current sampling circuit and voltage sampling circuit constitute sample circuit, the low frequency output terminal of computation chip has two-way output, wherein one the tunnel connect step-by-step counter, control circuit is removed on another road after photoelectric coupler isolation; Control circuit comprises single-chip microcomputer and reset chip and the peripheral circuit of the two, and wherein the counting input end of single-chip microcomputer is connected with the second road low frequency output of computation chip; Display circuit comprises the digital display tube by the P0 mouth of single-chip microcomputer and the control of P1 mouth; The power on/off executive circuit comprises that the control contact of magnetic latching relay is serially connected on the live wire of ac power supply line by the magnetic latching relay control circuit and the magnetic latching relay that is connected with this circuit of the P4 mouth control of single-chip microcomputer; Its circuit structure characteristics are also to comprise the safety control module SAM that is connected with the P4 mouth of single-chip microcomputer in the control circuit, integrated circuit card is the CPU card, the inside mask of safety control module SAM and CPU card has operating system TIMECOS2.0, and employing des encryption method, the universal key of being grasped by manufacturer among the safety control module SAM is revised as the key of grasping by power supply management department by revising the master key card after dispatching from the factory, single-chip microcomputer reads the content of safety control module SAM and finishes key authentication by the P4 mouth, a pair of normally closed contact is arranged on the deck, when the CPU card inserts, this disconnects normally closed contact, P3 mouth by single-chip microcomputer produces interruption, the P4 mouth reads the content in the CPU card, and the KD end that power supply is provided for integrated circuit card is by single-chip microcomputer and triode control.

For guaranteeing the consistance of clock signal, clock signal terminal at single-chip microcomputer is connected to a reverser, the output terminal of this reverser has two-way output, and wherein one tunnel output is connected with the clock signal terminal of safety control module SAM, and another road output connects the clock signal terminal of CPU card again behind a reverser.

Above-mentioned DC power-supply circuit, comprise generation to digitally+13V ,+12V ,+the 5V circuit and produce to simulation ground+the 5V circuit.

During use, earlier this single-phase intelligent card electric energy meter is connected between user's the live wire and zero line of supply line, the CPU card of the user being purchased electricity inserts in the deck, just the electric weight of purchasing in advance can be write in the safety control module SAM, extract the CPU card, just can electricity consumption, afterwards, when inserting the CPU card again, charactron can show dump energy.When remaining electric weight reduces to the warning electric weight, by charactron normal dodge and outage once, the prompting user purchases.

This single-phase intelligent card electric energy meter, the accurate power consumption of metering user not only, realize pre-payment, the phenomenon of having avoided not paying the electricity charge takes place, and owing to adopted CPU card and safety control module SAM, can adopt complicated cryptographic algorithm, password is grasped by power supply management department, has only key and the key among the safety control module SAM in the user CPU card after single-chip microcomputer authenticates, and electric weight could write in the single-chip microcomputer from the CPU card, so the privacy degrees height, data security is reliable.

Description of drawings

Accompanying drawing shows the embodiment of single-phase intelligent card electric energy meter, wherein, Fig. 1 is the circuit structure block scheme of single-phase intelligent card electric energy meter, Fig. 2 be wherein sample circuit and the electrical schematic diagram of metering circuit, Fig. 3 is the electrical schematic diagram of power on/off executive circuit, Fig. 4 is the electrical schematic diagram of control circuit, deck and display circuit, and Fig. 5 is the electrical schematic diagram of DC power-supply circuit.

Embodiment

With reference to above-mentioned accompanying drawing, single-phase intelligent card electric energy meter comprises sample circuit 1, metering circuit 2, control circuit 3, display circuit 4, power on/off executive circuit 5, deck 6, DC power-supply circuit 8 with deck 6 corresponding integrated circuit cards 7 and above-mentioned each circuit, sample circuit 1 is made of current sampling circuit and voltage sampling circuit, metering circuit 2 comprises computation chip AD7755, after copper-manganese resistance R F in the current sampling circuit samples to electric current, through resistance R 41, R42 enters the voltage sample input end V1n V1p of this computation chip AD7755, import as current sample, RF is connected on the live wire of ac power supply line, the voltage sampling circuit that is connected on the zero line is a voltage divider, constitute by resistance R 25----R36 and R37, enter the V2p of AD7755 after the dividing potential drop, import as voltage sample, after the A/D conversion is carried out in AD7755 inside, obtain power through digital multiplier, power is after the V/F conversion, by F1, F2 pin output low frequency, directly drive step-by-step counter M, show total electricity consumption, the signal of F1 pin is also after photoelectrical coupler IC2 isolates, remove single-chip microcomputer P30 pin counting, high frequency output CF pin is received table heel sub 6 after photoelectrical coupler IC1 isolates, 7 pin are as surveying the table signal.Control circuit 3 comprises single-chip microcomputer μ PD78F9026, chip MAX708 resets, safety control module SAM and their peripheral circuit, this single-chip microcomputer passes through SSDA, SRST reads the content of safety control module SAM and finishes key authentication, consistance for clock signal, the clock signal of single-chip microcomputer through reverser IC1E oppositely after as the clock signal of safety control module SAM, again through reverser IC1D once more oppositely after as the clock signal of integrated circuit card 7, reset chip MAX708 and peripheral circuit are finished following function: to the electrification reset of single-chip microcomputer, detection of power loss, combine preservation number a tree name when finishing power down with singlechip interruption.Display circuit 4 shows dump energy by group of four figures pipe, maximum demonstration electric weight is 9999 kilowatt hours, P10 by single-chip microcomputer controls the position that shows to the P13 mouth, and the effect of triode T1, T2, T3, T4 is to increase driving force, is exported the numeral that need show by the P0 mouth of single-chip microcomputer.Deck 6 and integrated circuit card 7 supporting uses; integrated circuit card 7 is the CPU card; a pair of normally closed contact is arranged on the deck 6; do not have CH5 and CH10 are connected; when the CPU card inserts; CH5 and CH10 disconnect; because contact CH10 and CH9 connect together in deck, so being the P32 mouth of single-chip microcomputer, CK becomes noble potential by electronegative potential, produce and interrupt; provide power supply by KD for the CPU card; by KRST; KCLK and KSDA read the content in the CPU card, and the KD end that power supply is provided for integrated circuit card is by single-chip microcomputer and triode T5 control, if the card that inserts is illegal card; can turn-off the power supply of integrated circuit card rapidly, thus protection electric energy meter circuit.Power on/off executive circuit 5 comprises that the P47 mouth by single-chip microcomputer is the magnetic latching relay control circuit and the magnetic latching relay that is connected with this circuit of A1 and B1 control with the P46 mouth, the control contact of magnetic latching relay is serially connected on the live wire of ac power supply line, the magnetic latching relay control circuit comprises triode T106, T107, T108, T109, T110, T111, when the A1 high level, during the B1 low level, there is electric current to pass through among the coil winding JA of magnetic latching relay, control contact adhesive, connect communication power supply, when the A1 low level, during the B1 high level, the control contact disconnects, and stops power supply.DC power-supply circuit 8 has four groups of outputs, first group of primary coil tap by transformer TR after diode D201 rectification, filter capacitor C210, C207 filtering, stabilivolt D205 voltage stabilizing, obtain to simulation ground GND1+5V voltage; The alternating voltage at transformer TR secondary coil two ends, after bridge rectifier B rectification, capacitor C 202 filtering, obtain to digitally+13V voltage, be second group output VA; VA is again through diode D203, capacitor C 204, obtain to digitally+12V voltage, be the 3rd group of output VB; VB is again through diode D204, capacitor C 205, three terminal integrated voltage stabilizer IC201, capacitor C 206, obtain to digitally+5V voltage, be the 4th group of output.

Claims (3)

1, a kind of single-phase intelligent card electric energy meter, comprise sample circuit (1), metering circuit (2), control circuit (3), display circuit (4), power on/off executive circuit (5), deck (6), DC power-supply circuit (8) with the corresponding integrated circuit card of deck (6) (7) and above-mentioned each circuit, metering circuit (2) comprises computation chip, be connected to current sampling circuit between the current sample input end of this computation chip and the ac power supply line live wire end, be connected to voltage sampling circuit between voltage sample input end and the zero line, current sampling circuit and voltage sampling circuit constitute sample circuit (1), the low frequency output terminal of computation chip has two-way output, wherein one the tunnel connect step-by-step counter, control circuit (3) is removed on another road after photoelectric coupler isolation; Control circuit (3) comprises single-chip microcomputer and reset chip and the peripheral circuit of the two, and wherein the counting input end of single-chip microcomputer is connected with the second road low frequency output of computation chip; Display circuit (4) comprises the digital display tube by the P0 mouth of single-chip microcomputer and the control of P1 mouth; Power on/off executive circuit (5) comprises that the control contact of magnetic latching relay is serially connected on the live wire of ac power supply line by the magnetic latching relay control circuit and the magnetic latching relay that is connected with this circuit of the P4 mouth control of single-chip microcomputer; It is characterized in that also comprising in the control circuit (3) the safety control module SAM that is connected with the P4 mouth of single-chip microcomputer, integrated circuit card (7) is the CPU card, the inside mask of safety control module SAM and CPU card has operating system TIMECOS2.0, and employing des encryption method, dispatch from the factory and the universal key of being grasped by manufacturer among the safety control module SAM is revised as the key of grasping by power supply management department after revise the master key card, single-chip microcomputer reads the content of safety control module SAM and finishes key authentication by the P4 mouth, deck has a pair of normally closed contact on (6), when the CPU card inserts, this disconnects normally closed contact, P3 mouth by single-chip microcomputer produces interruption, the P4 mouth reads the content in the CPU card, and the KD end that power supply is provided for integrated circuit card is by single-chip microcomputer and triode control.

2, single-phase intelligent card electric energy meter according to claim 1, it is characterized in that being connected to a reverser at the clock signal terminal of single-chip microcomputer, the output terminal of this reverser has two-way output, wherein one tunnel output is connected with the clock signal terminal of safety control module SAM, and another road output connects the clock signal terminal of CPU card again behind a reverser.

3, single-phase intelligent card electric energy meter according to claim 1 is characterized in that above-mentioned DC power-supply circuit (8), comprise generation to digitally+13V ,+12V ,+the 5V circuit and produce to simulation ground+the 5V circuit.

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