CN2152218Y - Microcomputer calibrating interface board for electric metre - Google Patents

Abstract

The utility model discloses a microcomputer calibrating interface board for an electric energy meter, composed of a tristate buffering driver, a detailed code circuit data of port address storing circuit, a counting control circuit, a D-shaped latch, a four digit binary counter, an optical coupling isolating circuit of the pulsed signal of a standard meter, a shaping filtering circuit of the pulsed signal of the standard meter, an optical coupling isolating circuit of the pulsed signal of a calibrated meter, a shaping filtering circuit of the pulsed signal of the calibrated meter, and a voltage converter. The utility model is directly inserted on the expansion slot of the system of the microcomputer. The utility model uses a microcomputer for calibration, which causes the developmental level of the automation and the intellectualization of the management of the calibration and the detection of the electric energy meter to be improved to a new stage.

Description

Microcomputer calibrating interface board for electric metre

The utility model relates to a kind of electric energy meter microcomputer verification interface board, belongs to circuit metrology and measurement Instrument technology field.

The verification of at present general electric energy meter is to use the tester that includes special-purpose single-chip microcomputer or special processing purpose board machine to finish on calibration console for electric energy meter.Its calibration method is to adopt the photoimpact relative method, is promptly just in time being turned over by the school electric energy meter in the time of certain revolution, and the angle that measurement standard electric energy meter rotating disk turns over is judged the accuracy of calibrated meter.The check meter circuit is made of photoimpact generation part, counting control section, error arithmetic section.There are many deficiencies in actual use in these testers, and the one, flexible, open poor.Because the instrument core is to adopt special-purpose single-chip microcomputer or special processing purpose board machine, control and the process of handling mainly are to rely on hardware circuit to realize, even software control procedure is arranged, also can only seal and are solidificated in the memory chip, and the user can't add, revises or expand.The 2nd, a little less than processing and the storage capacity.The verification detection signal is difficult to carry out complicated statistical study and calculating, and every data of result can not longer-term storage.And the data management function of not having verification result.The 3rd, method of operating is complicated and loaded down with trivial details.The 4th, the information output quantity is little, and the way of output is single.These deficiencies are brought difficulty in many uses to the user.

The purpose of this utility model is to be to overcome above-mentioned weak point of the prior art, and provide the bus-structured universal microcomputer of a kind of direct employing PC to carry out the verification and the calibrating management of electric energy meter, dirigibility is strong, storage capacity is strong, easy to operate, the electric energy meter microcomputer verification interface board that the information output quantity is big.

The purpose of this utility model is achieved in that the utility model comprises the bus-structured microcomputer system of PC, exchanges checking table, standard electric energy meter, photoelectric conversion device, its special character is that the verification interface board is made of the light lotus root isolation of ternary buffering driver, port address decoding scheme, data access and count control circuit, D-type latch, tetrad counter, standard scale pulse signal and plastic filter circuit, electric pressure converter, and the verification interface board is plugged on the expansion slot of microsystem plate.

The purpose of this utility model can also reach by following measure: the port address decoding scheme is by ternary buffering driver, microsystem plate expansion slot 62 pin plugs are connected with read-write control line with the address bus of microsystem, the output terminal of tetrad counter passes through D-type latch, microsystem expansion slot 62 pin plugs are connected with the data bus of microsystem, the light lotus root isolation of standard scale pulse signal and shaping filter are connected with the data access count control circuit with the tetrad counter, and the light lotus root isolation of tested mass color electric impulse signal and plastic filter circuit are connected with data access and count control circuit with the tetrad counter.

Principle of work of the present utility model: programmed instruction is controlled tetrad counter and D-type latch by port address signal and data access and count control circuit, will detect data and send in the computer memory.Microsystem is handled detecting data under the operation control of program, realizes by the error checking of school electric energy meter and calibrating management.

Compared to existing technology, the utlity model has following advantage:

1, the high efficiency of electrical energy meter calibration and calibrating management;

2, eliminated the verify error that human factor caused;

3, convenient and flexible operation, rich display information is clear;

4, verification computational accuracy height has been realized the standardization and the standardization of electrical energy meter calibration and calibrating management;

5, be fit to suitability for industrialized production.

The drawing explanation of accompanying drawing:

Fig. 1 is a block scheme of the present utility model.

Fig. 2 is an electrical schematic diagram of the present utility model.

Embodiment describes the utility model in detail below in conjunction with (accompanying drawing).

D-type latch of the present utility model is set to 2, the tetrad counter is set to 2, ternary buffering driver also is set to 2, microsystem plate expansion slot 62 pin plugs respectively with three-state buffer, D-type latch is connected, port decoding scheme one end links to each other with ternary buffering driver, the other end respectively with D-type latch, data access and count control circuit are connected, the other end of D-type latch two the tetrad counters that are connected with the tetrad counter are respectively contacted mutually, the shaping filter of polyphone back and standard scale pulse signal and light lotus root buffer circuit and data access and count control circuit are connected, the shaping filter of standard scale pulse signal and light lotus root buffer circuit are connected with voltage conversion device, the other end is connected with data access and count control circuit, one end of the shaping filter of calibrated meter photoelectric pulse signal and light lotus root buffer circuit links to each other with data access and count control circuit, the other end is connected with electric pressure converter, and electric pressure converter is connected on the operating circuit.

By D flip-flop (1), tristate bus line buffer gate circuit (2), electric capacity (5), AND circuit (6) (7), monostable trigger (8), resistance (9), electric capacity (10) composition data access and count control circuit.AND circuit (6) (7) is in series, and the other end of AND circuit (6) is connected with the CLK end of D flip-flop (1).Tristate bus line buffer gate circuit (2) is connected with the Q end of D flip-flop (1).Constitute the shaping filter and the light lotus root buffer circuit of calibrated meter photoelectric pulse signal by phase inverter (11), Schmidt trigger (12), electric capacity (13), resistance (14), (15), electric light coupling apparatus (16), resistance (17), OC gate circuit (18), Schmidt trigger (19), resistance (20).Phase inverter (11), Schmidt trigger (12), electric capacity (13), resistance (14) (15) are in series.One end of photoelectric coupling circuit (16) is connected with resistance (15), the input end of its diode is connected with resistance (17), output terminal is connected with OC gate circuit (18), Schmidt trigger (19), resistance (20), and OC gate circuit (16), Schmidt trigger (19), resistance (20) are in series.Constitute the shaping filter and the light lotus root buffer circuit of standard scale pulse signal by Schmidt trigger (28), electric capacity (27), resistance (26), resistance (25), photoelectric coupling (24), resistance (23), OC gate circuit (22).Schmidt (28), electric capacity (27) are in series, one end of resistance (26) is connected with electric capacity (27), the other end is connected with resistance (25), resistance (25) is connected with electric light coupling apparatus (24), the input end of the diode of photoelectric coupling circuit (24) is connected with resistance (23), output terminal is connected with OC gate circuit (22), and the other end of OC gate circuit and electric pressure converter (21) are in series.From four address wires (XXXH etc.) that the port address decoding scheme is drawn, wherein two OE output control terminals with D-type latch (3), (4) are connected, as the control signal wire of microcomputer reading of data.Remaining address wire is connected with the input control end of tristate bus line buffer gate circuit (2), is used for Microcomputer Detecting calibrated meter photoelectric pulse signal.Remaining another root address wire is removed end with the CD of D flip-flop and is connected, and removes the output state of tristate bus line buffer gate circuit (2) as microcomputer and uses.Schmidt trigger (28) output terminal is connected with the input end of tetrad counter (29) and the input end of gate circuit (6) simultaneously.The effect that is connected with the input end of AND circuit (6) in it be realize by checklist photoelectric pulse signal standard scale pulse signal synchronously.

In the normal verification process, when just in time being turned over one by the school electric energy meter when changeing, will produce a positive pulse signal at the output terminal of AND circuit (6).The rising edge of this positive pulse signal makes the Q end of D flip-flop (1) be converted to high level state.Like this, the Q of D flip-flop (1) end high level state is transferred on the data bus by tristate bus line buffer gate circuit (2) under the effect of port address line.The Q of D flip-flop (1) end high level state makes the CLK output of D-type latch (3) (4) allow end to be high level on the other hand, latchs the data of tetrad counter (29) this moment, (30) output terminal.The rising edge of positive pulse signal makes the Q end of D flip-flop (1) be converted to low level state.Like this, the low level of the Q of D flip-flop (1) end blocks the input of AND circuit (6), and undesired signal can not be passed through AND circuit (6).The negative edge of positive pulse signal makes the Q end of monostalbe trigger (8) produce a positive pulse, affacts the MR end clear terminal of tetrad counter (29) (30), to tetrad counter (29) (30) zero clearing.

Claims (2)

1, a kind of electric energy meter microcomputer verification interface board, comprise the bus-structured microcomputer system of PC, exchange checking table, standard electric energy meter, photoelectric conversion device, it is characterized in that the verification interface board is made of the light lotus root isolation of ternary buffering driver, port address decoding scheme, data access and count control circuit, D-type latch, tetrad counter, standard scale pulse signal and plastic filter circuit, electric pressure converter, the verification interface board is plugged on the expansion slot of microsystem plate.

2, electric energy meter microcomputer verification interface board according to claim 1, it is characterized in that the port address decoding scheme is by ternary buffering driver, microsystem plate expansion slot 62 pin plugs are connected with read-write control line with the address bus of microsystem, the output terminal of tetrad counter is connected with the data bus of microsystem by D-type latch microsystem expansion slot 62 pin plugs, the light lotus root isolation of standard scale pulse signal and shaping filter are connected with the data access count control circuit with the tetrad counter, and the light lotus root isolation of tested mass color electric impulse signal and plastic filter circuit are connected with data access and count control circuit with the tetrad counter.

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