CN201749138U

CN201749138U - Sampling circuit of single-phase and fee-controlled intelligent electric energy meter

Info

Publication number: CN201749138U
Application number: CN2010205166778U
Authority: CN
Inventors: 陈乐芬; 陈庆喜; 陈喜乐; 刘海; 陈恩德; 金伟权; 孟德辉; 叶孙德
Original assignee: FEIYUE UNITED ELECTRICAL GROUP Co Ltd
Current assignee: FEIYUE UNITED ELECTRICAL GROUP Co Ltd
Priority date: 2010-08-29
Filing date: 2010-08-29
Publication date: 2011-02-16
Anticipated expiration: 2020-08-29

Abstract

The utility model relates to a sampling circuit of a single-phase and fee-controlled intelligent electric energy meter. The sampling circuit comprises a special integrated circuit RN8209, a voltage sampling module, a current sampling module, a zero-sequence current sampling module, an impulse output module, as well as a power supply controlling module and a crystal oscillating module which are matched with the integrated circuit RN8209, wherein the current and the voltage which are sampled by the voltage sampling module, the current sampling module and the zero-sequence current sampling module are computed, compared and metered by the integrated circuit RN8209 and are outputted to the impulse output module. By comparing with the current and the voltage by the integrated circuit RN8209, the sampling circuit has the benefits of being convenient to judge whether the electricity is stolen and being capable of timely performing the prevention measure.

Description

The single-phase sample circuit that takes the control intelligent electric energy meter

Technical field

The utility model relates to a kind of electronic circuit, is specifically related to a kind of sample circuit of single-phase expense control intelligent electric energy meter.

Background technology

The sample circuit of electric energy meter on the market all has the storage function of measuring at present, the user in actual use, electric stealing electricity phenomenon often appears stealing, make relevant departments such as user and power office all inevitably suffer economic loss, and this class is installed in the function that the sample circuit of electric energy meter inside does not have the electric stealing of differentiation robber; Stealing itself relatively, electricity filching person self also exists a series of potential safety hazard, such as not being very professional electricity filching person when carrying out stealing, also causes danger such as fire easily in specific physical environment, therefore, adopt an effective measure that what stop stealing electricity phenomenon is the task of top priority.

Summary of the invention

The purpose of this utility model is to overcome the defective of prior art, and a kind of sample circuit that can effectively find stealing and prevent the single-phase expense control intelligent electric energy meter that stealing electricity phenomenon takes place is provided.

For achieving the above object, the utility model adopts a kind of sample circuit of single-phase expense control intelligent electric energy meter, comprise special IC RN8209, the voltage sample module, the current sample module, zero-sequence current sampling module and pulse output module, also comprise energy supply control module and crystal oscillator module with integrated circuit RN8209 coupling, wherein special IC RN8209 can measure active power, reactive power, meritorious energy, quadergy, and can provide two independent active power and effective value simultaneously, voltage effective value, the line frequency, zero passage interruptions etc. can realize anti-electricity-theft flexibly scheme; Its concrete course of work is as follows: the voltage sample module adopts crosstalk resistance mode that voltage drop is become small signal and through capacitor filtering, is input to the V2N of RN8209, and the V2P pin carries out voltage sample; The current sample module will be input to P10, P11 port to the small voltage signal that big current signal is transformed into by shunt, the small voltage signal at the P10 place V1AP pin that carries out being input to behind pressure drop and the capacitor filtering RN8209 by at least two parallel resistances is sampled then, and the small voltage signal at P11 place carries out current sample by the V1AN pin that at least two parallel resistances carry out being input to behind pressure drop and the capacitor filtering RN8209 equally; The zero-sequence current sampling module will be input to P9, P18 port to the little current signal that big current signal is transformed into by current transformer, the little current signal of P9 port by parallel resistance shunt with capacitor filtering after be input to the V1BP pin and carry out current sample, the little current signal of P18 port equally by parallel resistance shunt with capacitor filtering after be input to the V1BN pin and carry out current sample; Do corresponding comparison in the value and the current sample module of V1BP, the sampling of V1BN pin place in the value of V1AP, the sampling of V1AN pin place by the zero-sequence current sampling module, thereby judge whether stealing electricity phenomenon takes place and carry out safeguard procedures; Wherein the current/voltage of voltage sample module, current sample module and the sampling of zero-sequence current sampling module passes through computing, comparison and the metering of integrated circuit RN8209 and outputs on the pulse output module, this pulse output module comprises resistance, optocoupler and LED light, and electric energy meter is played a part verification and indication.

The utility model passes through improvement of the technical scheme, since in sample circuit, adopted have anti-phase power detection, the special IC RN8209 of functions such as voltage channel frequency measurement and voltage channel zero passage detection, itself and current sample module, voltage sample module and zero-sequence current sampling module are carried out appropriate being connected to realize anti-electricity-theft flexibly scheme, reached effective power-steeling preventing effect.

Description of drawings

Fig. 1 is the utility model embodiment circuit theory diagrams.

Each module numbering in the accompanying drawing is as follows:

Current sample module 1, voltage sample module 2, zero-sequence current sampling module 3,

Energy supply control module 4, pulse output module 5, crystal oscillator module 6

Embodiment

As shown in Figure 1, specific embodiment of the utility model is a kind of sample circuit of single-phase expense control intelligent electric energy meter, comprise a special IC RN8209, voltage sample module 2, current sample module 1, zero-sequence current sampling module 3 and pulse output module 5, also comprise energy supply control module 4 and crystal oscillator module 6 with integrated circuit RN8209 coupling, wherein voltage sample module 2 adopts crosstalk resistance mode successively by crosstalk resistance R64, R65, R66, R69, R71, R73 becomes voltage drop small signal and through capacitor C 33 filtering, is input to the V2N of RN8209, and the V2P pin carries out voltage sample; Current sample module 1 will be input to P10, P11 port to the small voltage signal that big current signal is transformed into by shunt, the small voltage signal of P10 port is sampled by the V1AP port that R28, R45 carry out being input to after pressure drop and the C27 filtering RN8209 then, and the small voltage signal at P11 place carries out current sample by the V1AN port that R29, R46 carry out being input to after pressure drop and the C28 filtering RN8209; Zero-sequence current sampling module 3 will be input to P9, P18 to the little current signal that big current signal is transformed into by current transformer, the little current signal at P9 place shunt by R44, R43 and C26 filtering after be input to V1BP and carry out current sample, the little current signal at P18 place shunt by R67, R68 and C31 filtering after be input to V1BN and carry out current sample; Do corresponding comparison in the value and the current sample module of V1BP, the sampling of V1BN place in the value of V1AP, the sampling of V1AN place by zero-sequence current sampling module 3, thereby judge whether stealing takes place.As shown in Figure 1, pulse output module 5 is connected on the PF pin of RN8209, after the computing and metering of the current/voltage of sampling through the RN8209 internal circuit, according to the gain merit output of pulse of active energy, meritorious pulse hinders the R51 current limliting and the indication of LED 2 and the isolation of optocoupler OP1 by the crosstalk on the pulse output module and outputs on the ammeter terminal, plays a part verification and indication.

Obviously, the foregoing description of the present utility model only is for the utility model example clearly is described, and is not to be qualification to embodiment of the present utility model.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.And these belong to conspicuous variation or the change that spirit of the present utility model amplified out and still are among the protection domain of the present utility model.

Claims

1. single-phase sample circuit that takes the control intelligent electric energy meter, it is characterized in that: described sample circuit comprises special IC RN8209, voltage sample module, current sample module, zero-sequence current sampling module and pulse output module, also comprise energy supply control module and crystal oscillator module with integrated circuit RN8209 coupling, wherein the voltage sample module adopts crosstalk resistance mode successively by crosstalk resistance R64, R65, R66, R69, R71, R73 becomes small signal and process C33 filtering to voltage drop, be input to the V2N of RN8209, V2P carries out voltage sample; The current sample module will be input to P10, P11 to the small voltage signal that big current signal is transformed into by shunt, the small voltage signal at P10 place is sampled by the V1AP port that R28, R45 carry out being input to after pressure drop and the C27 filtering RN8209 then, and the small voltage signal at P11 place carries out current sample by the V1AN port that R29, R46 carry out being input to after pressure drop and the C28 filtering RN8209; The zero-sequence current sampling module will be input to P9, P18 to the little current signal that big current signal is transformed into by current transformer, the little current signal at P9 place shunt by R44, R43 and C26 filtering after be input to V1BP and carry out current sample, the little current signal at P18 place shunt by R67, R68 and C31 filtering after be input to V1BN and carry out current sample; Do corresponding comparison in the value and the current sample module of V1BP, the sampling of V1BN place in the value of V1AP, the sampling of V1AN place by the zero-sequence current sampling module, thereby judge whether stealing takes place.

2. the single-phase sample circuit that takes the control intelligent electric energy meter according to claim 1, it is characterized in that: described pulse output module is connected on the PF pin of RN8209, after the computing and metering of the current/voltage of sampling through the RN8209 internal circuit, according to the gain merit output of pulse of active energy, meritorious pulse outputs on the ammeter terminal by the resistance R51 current limliting of the crosstalk on the pulse output module and the indication of LED 2 and the isolation of optocoupler OP1.