CN104569726A - Intelligent sensor for detecting wiring state in electric energy meter verification - Google Patents
Intelligent sensor for detecting wiring state in electric energy meter verification Download PDFInfo
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Abstract
The invention discloses an intelligent sensor for detecting a wiring state in electric energy meter verification. The intelligent sensor comprises a control circuit, an analog-digital conversion chip, a communication interface, a voltage sampling circuit, a current sampling circuit and a power circuit. The voltage sampling circuit is used for collecting voltage signals on a detecting terminal of an electric energy meter, the current sampling circuit is used for collecting current signals on the detecting terminal of the electric energy meter, and the power circuit is used for powering all the parts. The voltage sampling circuit and the current sampling circuit convert collected alternating-current electric signals into direct-current electric signals, then the direct-current electric signals are converted into digital signals through the analog-digital conversion chip, and the digital signals are output to the control circuit. The control circuit transmits the two paths of digital signals to an upper computer through the communication interface, the upper computer monitors parameter changes of the electric energy meter in real time, and the wiring state of the electric energy meter is judged. Changes of the electric quantity on the wiring terminal of the electric energy meter can be detected in real time, and therefore the wiring state of the electric energy meter is determined, the wiring state of the electric energy meter can be judged fast and accurately, manpower and material resources are reduced, and verification efficiency is improved.
Description
Technical field
The present invention relates to a kind of intelligent sensor detected for wiring state in electric energy meter calibration, belong to electric energy detection technical field.
Background technology
In the verification process of current electric energy meter, usually exist because connection box of electric energy meter state is bad, thus cause the tested situation being decided to be unacceptable product of the normal electric energy meter of function, quality.Current connection box of electric energy meter terminal experienced by continuous improvement, improve significantly and be wired as power, but these improvement just rest in the external structure of connection terminal, if there is the problem of electric energy meter calibration failure in electric energy meter calibration process, still can not determine electric energy meter problem or wiring state out of joint, like this in follow-up work, also need to find the problem further, be confirmed to be electric energy meter problem or wiring issue, time spent like this and manpower or considerable.
Summary of the invention
The object of the invention is to overcome deficiency of the prior art, a kind of intelligent sensor detected for wiring state in electric energy meter calibration is provided, the electric quantity change on connection box of electric energy meter terminal can be detected in real time, thus determine whether the wiring state of electric energy meter has problems.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: the intelligent sensor detected for wiring state in electric energy meter calibration, comprise control circuit, modulus conversion chip, communication interface for communicating with host computer, for gather the voltage signal on electric energy meter detection terminal voltage sampling circuit, for gathering the current sampling circuit of the current signal on electric energy meter detection terminal; The ac signal collected is converted to DC signal by voltage sampling circuit, current sampling circuit, then digital signal is converted to respectively by modulus conversion chip, and export control circuit to, two ways of digital signals is transferred to host computer by communication interface by control circuit, host computer monitors the Parameters variation of electric energy meter in real time, judges the wiring state of electric energy meter; Described intelligent sensor also comprises power circuit, and described power circuit is electrically connected with voltage sampling circuit, current sampling circuit, modulus conversion chip, control circuit and communication interface respectively, for providing d. c. voltage signal.
Described voltage sampling circuit comprises voltage input interface JP21, step-down transformer T21, the first all-wave precise rectification circuit and the first filtering circuit, the input end of described voltage input interface JP21 is electrically connected with electric energy meter detection terminal, output terminal is electrically connected with the former limit of step-down transformer T21, the secondary of step-down transformer T21 is electrically connected with the input end of the first all-wave precise rectification circuit, and the output terminal of the first all-wave precise rectification circuit is connected through the first filtering circuit the corresponding interface with described modulus conversion chip.
Described current sampling circuit comprises electric current input interface JP31, current transformer T31, the second all-wave precise rectification circuit and the second filtering circuit, the input end of described electric current input interface JP31 is electrically connected with electric energy meter detection terminal, output terminal is electrically connected with the former limit of current transformer T31, the secondary of current transformer T31 is electrically connected with the input end of the second all-wave precise rectification circuit, the secondary of current transformer T31 is also parallel with sampling resistor R30, and the output terminal of the second all-wave precise rectification circuit is connected through the second filtering circuit the corresponding interface with described modulus conversion chip.
Described first all-wave precise rectification circuit and the second all-wave precise rectification circuit adopt identical circuit structure, comprise the first amplifier, the second amplifier, the first diode and the second diode, the positive pole of described first amplifier and the second amplifier is respectively by respective ground resistance earth; The negative pole of the first amplifier is connected the first resistance, reverse parallel connection first diode between negative pole and output terminal, output terminal differential concatenation second diode; The positive pole of the second diode is connected after the second resistance and is connected with the negative electricity of the first amplifier, and be connected with the negative electricity of the second amplifier after series connection the 3rd resistance, the input end of the first resistance is electrically connected by the 4th resistance with the output terminal of the 3rd resistance; Negative pole five resistance in parallel with the output terminal of the second amplifier of the second amplifier.
Described first filtering circuit and the second filtering circuit adopt identical circuit structure, comprise the 6th resistance, the 7th resistance, the first filter capacitor and the second filter capacitor, one end of first filter capacitor is electrically connected with the output terminal of the second amplifier by series connection the 6th resistance, by connecting, the 7th resistance is electrically connected with modulus conversion chip, the other end of the first filter capacitor and one end common ground of the second filter capacitor, the electrical nodes that the other end of the second filter capacitor is connected with the 7th resistance and modulus conversion chip connects.
Described control circuit adopts AT89C51 type control circuit, and the RST pin of AT89C51 type control circuit is connected with reset circuit; Described reset circuit comprises reset button S41, filter resistance R41, polarity low frequency filtering electric capacity C41 and stake resistance R42, after reset button S41 connects with filter resistance R41, in parallel with polarity low frequency filtering electric capacity C41, the positive pole of polarity low frequency filtering electric capacity C41 is electrically connected with the high-potential output end of power circuit, ground connection after negative pole series connection earth resistance R42; XTAL1 and the XTAL2 pin of AT89C51 type control circuit is also parallel with crystal oscillating circuit, described crystal oscillating circuit comprises electric capacity C43, electric capacity C42 and crystal oscillator Y41, ground connection after XTAL1 series capacitance C42, ground connection after XTAL2 pin serial connection electric capacity C43, crystal oscillator Y41 is connected in parallel between XTAL1 and XTAL2 pin.
Described modulus conversion chip adopts ADC0808 type modulus conversion chip.
Described communication interface comprises communication interface chip U54, and communication interface chip U54 is connected with the corresponding pin of control circuit by three photoelectrical couplers U51, U52, U53; Described communication interface chip selects MAX485 chip, and three described photoelectrical coupler U51, U52, U53 all select 6N137 photoelectrical coupler; The CA pin of photoelectrical coupler U51 is electrically connected with the RO pin of MAX485 chip, be electrically connected with the high-potential output end of power circuit after AN pin serial connection resistance R54, be electrically connected with OUT pin after VCC pin serial connection resistance R51, OUT pin is electrically connected with the RX pin of control circuit; The CA pin of photoelectrical coupler U52 is electrically connected with the TX pin of control circuit, be electrically connected with the high-potential output end of power circuit after AN pin serial connection resistance R52, be electrically connected with OUT pin after VCC pin serial connection resistance R55, OUT pin is electrically connected with the DI pin of MAX485 chip, wherein, VCC pin is also electrically connected with the high-potential output end of power circuit; The CA pin of photoelectrical coupler U53 is electrically connected with the RS485 pin of control circuit, be electrically connected with the high-potential output end of power circuit after AN pin serial connection resistance R53, be electrically connected with OUT pin after VCC pin serial connection resistance R56, the DE of OUT pin and MAX485 chip and
pin is electrically connected, and wherein, VCC pin is also electrically connected with the high-potential output end of power circuit; The GND end ground connection respectively of photoelectrical coupler U51, photoelectrical coupler U52 and photoelectrical coupler U53; Be parallel with build-out resistor R58 between the A pin of MAX485 chip and B pin, wherein A pin is also by resistance in series R59 ground connection, and B pin is electrically connected with the high-potential output end of power circuit by resistance in series R57; VCC pin is also electrically connected with the high-potential output end of power circuit, GND pin ground connection.
Described power circuit comprises switch interface JP11, transformer T11, rectifier bridge and circuit of three-terminal voltage-stabilizing integrated, the input end of described switch interface JP11 is electrically connected with three-phase alternating current civil power, output terminal is electrically connected with the former limit of transformer T11, the secondary of transformer T11 is connected with the input end of rectifier bridge, after the output terminal polarity low frequency filtering in parallel electric capacity C11 of rectifier bridge, in parallel with high-frequency filter capacitor C12, then be electrically connected with the Vin pin of circuit of three-terminal voltage-stabilizing integrated and GND pin; Be parallel with polarity low frequency filtering electric capacity C13, high-frequency filter capacitor C14 and filter resistance R11 between the GND pin of circuit of three-terminal voltage-stabilizing integrated and Vout pin successively, the GND pin of circuit of three-terminal voltage-stabilizing integrated passes through wired earth.
Described circuit of three-terminal voltage-stabilizing integrated adopts model to be LM7805 type circuit of three-terminal voltage-stabilizing integrated.
Compared with prior art, the beneficial effect that the present invention reaches is: by the voltage on detection electric energy meter detection terminal or current value, can judge connection box of electric energy meter state rapidly and accurately, reduce human and material resources, improve calibrating efficiency; Wiring defective mode can be fed back to host computer in time, thus in time for next step verification process provides decision-making foundation.
Accompanying drawing explanation
Fig. 1 is schematic block circuit diagram of the present invention.
Fig. 2 is the circuit diagram of voltage sampling circuit in Fig. 1.
Fig. 3 is the circuit diagram of current sampling circuit in Fig. 1.
Fig. 4 is the circuit diagram of modulus conversion chip in Fig. 1.
Fig. 5 is the circuit diagram of control circuit in Fig. 1.
Fig. 6 is the circuit diagram of communication interface in Fig. 1.
Fig. 7 is the circuit diagram of power circuit in Fig. 1.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.Following examples only for technical scheme of the present invention is clearly described, and can not limit the scope of the invention with this.
As shown in Figure 1, for the intelligent sensor that wiring state in electric energy meter calibration detects, voltage sampling circuit, current sampling circuit, modulus conversion chip, control circuit, communication interface and the power circuit for powering to each several part is comprised.Voltage sampling circuit, current sampling circuit are respectively used to gather alternating voltage, the current signal on electric energy meter detection terminal, then the ac signal collected is converted to DC signal, digital signal is converted to respectively again by modulus conversion chip, and export control circuit to, two ways of digital signals is transferred to host computer by communication interface by control circuit, host computer monitors the Parameters variation of electric energy meter in real time, judges the wiring state of electric energy meter.
As shown in Figure 2, it is the circuit diagram of voltage sampling circuit, comprise voltage input interface JP21, step-down transformer T21, the first all-wave precise rectification circuit and the first filtering circuit, the input end of voltage input interface JP21 is electrically connected with electric energy meter detection terminal, output terminal is electrically connected with the former limit of step-down transformer T21, the secondary of step-down transformer T21 is electrically connected with the input end of the first all-wave precise rectification circuit, and the output terminal of the first all-wave precise rectification circuit is connected with the corresponding interface of modulus conversion chip through the first filtering circuit.
First all-wave precise rectification circuit comprises the first amplifier U21A, the second amplifier U22A, the first diode D21 and the second diode D22.The positive pole of the first amplifier U21A is by stake resistance R22 ground connection, and the positive pole of the second amplifier U22A is by stake resistance R26 ground connection.The negative pole of the first amplifier U21A first resistance R21 that connects is electrically connected with the high-potential output end of step-down transformer T21.Reverse parallel connection first diode D21 between the negative pole of the first amplifier U21A and output terminal, output terminal differential concatenation second diode D22.The positive pole of the second diode D22 is connected after the second resistance R24 and is connected with the negative electricity of the first amplifier U21A, is connected after series connection the 3rd resistance R25 with the negative electricity of the second amplifier U22A.The input end of the first resistance R21 is electrically connected by the 4th resistance R23 with the output terminal of the 3rd resistance R25; The negative pole five resistance R27 in parallel with the output terminal of the second amplifier U22A of the second amplifier U22A.
First filtering circuit comprises the 6th resistance R28, the 7th resistance R29, the first filter capacitor C21 and the second filter capacitor C22, one end of first filter capacitor C21 is electrically connected with the output terminal of the second amplifier U22A by series connection the 6th resistance R28, by connecting, the 7th resistance R29 is electrically connected with modulus conversion chip, the other end of the first filter capacitor C21 and one end common ground of the second filter capacitor C22, the electrical nodes that the other end of the second filter capacitor C22 is connected with the 7th resistance R29 and modulus conversion chip connects.
As shown in Figure 3, be the circuit diagram of current sampling circuit.With voltage sampling circuit unlike, in current sampling circuit, the secondary of current transformer T31 is parallel with sampling resistor R30.The particular circuit configurations of current sampling circuit is: comprise electric current input interface JP31, current transformer T31, second all-wave precise rectification circuit and the second filtering circuit, the input end of electric current input interface JP31 is electrically connected with electric energy meter detection terminal, output terminal is electrically connected with the former limit of current transformer T31, the secondary of current transformer T31 is electrically connected with the input end of the second all-wave precise rectification circuit, the secondary of current transformer T31 is also parallel with sampling resistor R30, the output terminal of the second all-wave precise rectification circuit is connected with the corresponding interface of modulus conversion chip through the second filtering circuit.
Second all-wave precise rectification circuit and the first all-wave precise rectification circuit adopt identical circuit connection structure, comprise the first amplifier U31A, the second amplifier U32A, the first diode D31 and the second diode D33.The positive pole of the first amplifier U31A is by stake resistance R32 ground connection, and the positive pole of the second amplifier U32A is by stake resistance R36 ground connection.The negative pole of the first amplifier U31A first resistance R31 that connects is electrically connected with the high-potential output end of step-down transformer T31.Reverse parallel connection first diode D31 between the negative pole of the first amplifier U31A and output terminal, output terminal differential concatenation second diode D32.The positive pole of the second diode D32 is connected after the second resistance R34 and is connected with the negative electricity of the first amplifier U31A, is connected after series connection the 3rd resistance R35 with the negative electricity of the second amplifier U32A.The input end of the first resistance R31 is electrically connected by the 4th resistance R33 with the output terminal of the 3rd resistance R35; The negative pole five resistance R37 in parallel with the output terminal of the second amplifier U32A of the second amplifier U32A.
Second filtering circuit and the first filtering circuit adopt identical circuit connection structure, comprise the 6th resistance R38, the 7th resistance R39, the first filter capacitor C31 and the second filter capacitor C32, one end of first filter capacitor C31 is electrically connected with the output terminal of the second amplifier U32A by series connection the 6th resistance R38, by connecting, the 7th resistance R39 is electrically connected with modulus conversion chip, the other end of the first filter capacitor C31 and one end common ground of the second filter capacitor C32, the electrical nodes that the other end of the second filter capacitor C32 is connected with the 7th resistance R39 and modulus conversion chip connects.
First amplifier U21A, U31A and the second amplifier U22A, U32A select model to be the operational amplifier of LM324AD.First diode D21, D31 and second diode D22, D32 selects model to be the diode of IN4148.
As shown in Figure 4, it is the circuit diagram of modulus conversion chip, modulus conversion chip adopts ADC0808 type modulus conversion chip, there are 28 pins, comprise the pin of IN0 ~ IN7 totally 8 road analog input ends, D0 ~ D7 totally 8 railway digital amount output terminals and A, B, C totally 3 road address input lines and other necessity, 3 road address input lines are for selecting 8 tunnel analog channel Zhong mono-tunnels.VCC pin is connected 5V direct supply with VREF (+) pin, GND pin and VREF (-) pin ground connection.
As shown in Figure 5, be the circuit diagram of control circuit.Control circuit adopts AT89C51 type control circuit, the RST pin of AT89C51 type control circuit is connected with reset circuit: comprise reset button S41, filter resistance R41, polarity low frequency filtering electric capacity C41 and stake resistance R42, after reset button S41 connects with filter resistance R41, in parallel with polarity low frequency filtering electric capacity C41, the positive pole of polarity low frequency filtering electric capacity C41 is electrically connected with the high-potential output end of power circuit, ground connection after negative pole series connection earth resistance R42.
XTAL1 and the XTAL2 pin of AT89C51 type control circuit is also parallel with crystal oscillating circuit: comprise electric capacity C43, electric capacity C42 and crystal oscillator Y41, ground connection after XTAL1 series capacitance C42, ground connection after XTAL2 pin serial connection electric capacity C43, crystal oscillator Y41 is connected in parallel between XTAL1 and XTAL2 pin.
AT89C51 type control circuit is connected with communication interface two-way communication by pin RX, TX, RS485.
As shown in Figure 6, be the circuit diagram of communication interface.Comprise communication interface chip U54, communication interface chip U54 selects MAX485 chip.Communication interface chip U54 is connected with three photoelectrical couplers U51, U52, U53, three photoelectrical couplers U51, U52, U53 all select 6N137 photoelectrical coupler.Be parallel with build-out resistor R58 between the A pin of MAX485 chip and B pin, wherein A pin is also by resistance in series R59 ground connection, and B pin is electrically connected with the high-potential output end of power circuit by resistance in series R57; VCC pin is also electrically connected with the high-potential output end of power circuit, GND pin ground connection.
The CA pin of photoelectrical coupler U51 is electrically connected with the RO pin of MAX485 chip, be electrically connected with the high-potential output end of power circuit after AN pin serial connection resistance R54, be electrically connected with OUT pin after VCC pin serial connection resistance R51, OUT pin is electrically connected with the RX pin of control circuit.
The CA pin of photoelectrical coupler U52 is electrically connected with the TX pin of control circuit, be electrically connected with the high-potential output end of power circuit after AN pin serial connection resistance R52, be electrically connected with OUT pin after VCC pin serial connection resistance R55, OUT pin is electrically connected with the DI pin of MAX485 chip, wherein, VCC pin is also electrically connected with the high-potential output end of power circuit.
The CA pin of photoelectrical coupler U53 is electrically connected with the RS485 pin of control circuit, be electrically connected with the high-potential output end of power circuit after AN pin serial connection resistance R53, be electrically connected with OUT pin after VCC pin serial connection resistance R56, the DE of OUT pin and MAX485 chip and
pin is electrically connected, and wherein, VCC pin is also electrically connected with the high-potential output end of power circuit.
The GND end ground connection respectively of photoelectrical coupler U51, photoelectrical coupler U52 and photoelectrical coupler U53.
As shown in Figure 7, be the circuit diagram of power circuit.Comprise switch interface JP11, transformer T11, rectifier bridge and circuit of three-terminal voltage-stabilizing integrated, circuit of three-terminal voltage-stabilizing integrated adopts model to be LM7805 type circuit of three-terminal voltage-stabilizing integrated, comprises Vin, GND and Vout tri-pins.The input end of switch interface JP11 is electrically connected with three-phase 220V electric main, output terminal is electrically connected with the former limit of transformer T11, the secondary of transformer T11 is connected with the input end of rectifier bridge, after the output terminal polarity low frequency filtering in parallel electric capacity C11 of rectifier bridge, in parallel with high-frequency filter capacitor C12, then be electrically connected with the Vin pin of circuit of three-terminal voltage-stabilizing integrated and GND pin.Be parallel with polarity low frequency filtering electric capacity C13, high-frequency filter capacitor C14 and filter resistance R11 between the GND pin of circuit of three-terminal voltage-stabilizing integrated and Vout pin successively, the GND pin of circuit of three-terminal voltage-stabilizing integrated passes through wired earth.Rectifier bridge is made up of four IN4001 type diodes.
When performing electric energy meter Detection task, if when electric energy meter mounting is in good condition, its voltage, current values will in normal scopes; If the mounting state of electric energy meter goes wrong, voltage, current values will depart from normal value.Now by detecting the voltage and current numerical value be added on electric energy meter detection terminal, just can obtain the mounting state of electric energy meter, thus wiring defective mode is fed back to host computer in time, to propose the unsuccessful fast processing mechanism of a kind of wiring.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the prerequisite not departing from the technology of the present invention principle; can also make some improvement and distortion, these improve and distortion also should be considered as protection scope of the present invention.
Claims (10)
1. for the intelligent sensor of wiring state detection in electric energy meter calibration, it is characterized in that, comprise control circuit, modulus conversion chip, communication interface for communicating with host computer, for gather the voltage signal on electric energy meter detection terminal voltage sampling circuit, for gathering the current sampling circuit of the current signal on electric energy meter detection terminal;
The ac signal collected is converted to DC signal by voltage sampling circuit, current sampling circuit, then digital signal is converted to respectively by modulus conversion chip, and export control circuit to, two ways of digital signals is transferred to host computer by communication interface by control circuit, host computer monitors the Parameters variation of electric energy meter in real time, judges the wiring state of electric energy meter;
Described intelligent sensor also comprises power circuit, and described power circuit is electrically connected with voltage sampling circuit, current sampling circuit, modulus conversion chip, control circuit and communication interface respectively, for providing d. c. voltage signal.
2. the intelligent sensor detected for wiring state in electric energy meter calibration according to claim 1, it is characterized in that, described voltage sampling circuit comprises voltage input interface (JP21), step-down transformer (T21), first all-wave precise rectification circuit and the first filtering circuit, the input end of described voltage input interface (JP21) is electrically connected with electric energy meter detection terminal, output terminal is electrically connected with the former limit of step-down transformer (T21), the secondary of step-down transformer (T21) is electrically connected with the input end of the first all-wave precise rectification circuit, the output terminal of the first all-wave precise rectification circuit is connected through the first filtering circuit the corresponding interface with described modulus conversion chip.
3. the intelligent sensor detected for wiring state in electric energy meter calibration according to claim 2, it is characterized in that, described current sampling circuit comprises electric current input interface (JP31), current transformer (T31), second all-wave precise rectification circuit and the second filtering circuit, the input end of described electric current input interface (JP31) is electrically connected with electric energy meter detection terminal, output terminal is electrically connected with the former limit of current transformer (T31), the secondary of current transformer (T31) is electrically connected with the input end of the second all-wave precise rectification circuit, the secondary of current transformer (T31) is also parallel with sampling resistor (R30), the output terminal of the second all-wave precise rectification circuit is connected through the second filtering circuit the corresponding interface with described modulus conversion chip.
4. the intelligent sensor detected for wiring state in electric energy meter calibration according to claim 3, it is characterized in that, described first all-wave precise rectification circuit and the second all-wave precise rectification circuit adopt identical circuit structure, comprise the first amplifier, the second amplifier, the first diode and the second diode, the positive pole of described first amplifier and the second amplifier is respectively by respective ground resistance earth;
The negative pole of the first amplifier is connected the first resistance, reverse parallel connection first diode between negative pole and output terminal, output terminal differential concatenation second diode; The positive pole of the second diode is connected after the second resistance and is connected with the negative electricity of the first amplifier, and be connected with the negative electricity of the second amplifier after series connection the 3rd resistance, the input end of the first resistance is electrically connected by the 4th resistance with the output terminal of the 3rd resistance; Negative pole five resistance in parallel with the output terminal of the second amplifier of the second amplifier.
5. the intelligent sensor detected for wiring state in electric energy meter calibration according to claim 4, it is characterized in that, described first filtering circuit and the second filtering circuit adopt identical circuit structure, comprise the 6th resistance, 7th resistance, first filter capacitor and the second filter capacitor, one end of first filter capacitor is electrically connected with the output terminal of the second amplifier by series connection the 6th resistance, by connecting, the 7th resistance is electrically connected with modulus conversion chip, the other end of the first filter capacitor and one end common ground of the second filter capacitor, the electrical nodes that the other end of the second filter capacitor is connected with the 7th resistance and modulus conversion chip connects.
6. the intelligent sensor detected for wiring state in electric energy meter calibration according to claim 1, is characterized in that, described control circuit adopts AT89C51 type control circuit, and the RST pin of AT89C51 type control circuit is connected with reset circuit;
Described reset circuit comprises reset button (S41), filter resistance (R41), polarity low frequency filtering electric capacity (C41) and stake resistance (R42), after reset button (S41) is connected with filter resistance (R41), in parallel with polarity low frequency filtering electric capacity (C41), the positive pole of polarity low frequency filtering electric capacity (C41) is electrically connected with the high-potential output end of power circuit, negative pole series connection earth resistance (R42) ground connection afterwards;
XTAL1 and the XTAL2 pin of AT89C51 type control circuit is also parallel with crystal oscillating circuit, described crystal oscillating circuit comprises electric capacity (C43), electric capacity (C42) and crystal oscillator (Y41), XTAL1 series capacitance (C42) ground connection afterwards, XTAL2 pin serial connection electric capacity (C43) ground connection afterwards, crystal oscillator (Y41) is connected in parallel between XTAL1 and XTAL2 pin.
7. the intelligent sensor detected for wiring state in electric energy meter calibration according to claim 6, is characterized in that, described modulus conversion chip adopts ADC0808 type modulus conversion chip.
8. the intelligent sensor detected for wiring state in electric energy meter calibration according to claim 6, it is characterized in that, described communication interface comprises communication interface chip (U54), and communication interface chip (U54) is connected with the corresponding pin of control circuit by three photoelectrical couplers (U51, U52, U53);
Described communication interface chip selects MAX485 chip, and three described photoelectrical couplers (U51, U52, U53) all select 6N137 photoelectrical coupler;
The CA pin of photoelectrical coupler (U51) is electrically connected with the RO pin of MAX485 chip, AN pin serial connection resistance (R54) is electrically connected with the high-potential output end of power circuit afterwards, VCC pin serial connection resistance (R51) is electrically connected with OUT pin afterwards, and OUT pin is electrically connected with the RX pin of control circuit;
The CA pin of photoelectrical coupler (U52) is electrically connected with the TX pin of control circuit, AN pin serial connection resistance (R52) is electrically connected with the high-potential output end of power circuit afterwards, VCC pin serial connection resistance (R55) is electrically connected with OUT pin afterwards, OUT pin is electrically connected with the DI pin of MAX485 chip, wherein, VCC pin is also electrically connected with the high-potential output end of power circuit;
The CA pin of photoelectrical coupler (U53) is electrically connected with the RS485 pin of control circuit, AN pin serial connection resistance (R53) is electrically connected with the high-potential output end of power circuit afterwards, VCC pin serial connection resistance (R56) is electrically connected with OUT pin afterwards, the DE of OUT pin and MAX485 chip and
pin is electrically connected, and wherein, VCC pin is also electrically connected with the high-potential output end of power circuit;
The GND end ground connection respectively of photoelectrical coupler (U51), photoelectrical coupler (U52) and photoelectrical coupler (U53);
Build-out resistor (R58) is parallel with between the A pin of MAX485 chip and B pin, wherein A pin is also by resistance in series (R59) ground connection, and B pin is electrically connected with the high-potential output end of power circuit by resistance in series (R57); VCC pin is also electrically connected with the high-potential output end of power circuit, GND pin ground connection.
9. the intelligent sensor detected for wiring state in electric energy meter calibration according to claim 1, it is characterized in that, described power circuit comprises switch interface (JP11), transformer (T11), rectifier bridge and circuit of three-terminal voltage-stabilizing integrated, the input end of described switch interface (JP11) is electrically connected with three-phase alternating current civil power, output terminal is electrically connected with the former limit of transformer (T11), the secondary of transformer (T11) is connected with the input end of rectifier bridge, after output terminal polarity low frequency filtering electric capacity (C11) in parallel of rectifier bridge, in parallel with high-frequency filter capacitor (C12), be electrically connected with the Vin pin of circuit of three-terminal voltage-stabilizing integrated and GND pin again,
Be parallel with polarity low frequency filtering electric capacity (C13), high-frequency filter capacitor (C14) and filter resistance (R11) between the GND pin of circuit of three-terminal voltage-stabilizing integrated and Vout pin successively, the GND pin of circuit of three-terminal voltage-stabilizing integrated passes through wired earth.
10. the intelligent sensor detected for wiring state in electric energy meter calibration according to claim 9, is characterized in that, described circuit of three-terminal voltage-stabilizing integrated adopts model to be LM7805 type circuit of three-terminal voltage-stabilizing integrated.
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| CN108427009A (en) * | 2018-04-19 | 2018-08-21 | 核工业理化工程研究院 | A kind of special signal detection circuit, motor speed measuring system and detection method |
| CN109375560A (en) * | 2018-12-14 | 2019-02-22 | 二三电器（上海）有限公司 | Split type intelligent controller |
| CN109375560B (en) * | 2018-12-14 | 2023-10-20 | 二一三电器(上海)有限公司 | Split intelligent controller |
| CN109901556A (en) * | 2019-03-27 | 2019-06-18 | 同共科技(赤壁)有限公司 | A kind of electric control device Working state analysis method and system |
| CN109901556B (en) * | 2019-03-27 | 2023-11-21 | 同共科技(赤壁)有限公司 | Method and system for analyzing working state of electric control device |
| CN110595572A (en) * | 2019-08-16 | 2019-12-20 | 青岛科技大学 | Simple and easy regimen detecting system |
| CN113300358A (en) * | 2021-05-24 | 2021-08-24 | 湖北省电力装备有限公司 | Active power distribution network electric energy management device and use method thereof |
| CN113589008A (en) * | 2021-07-12 | 2021-11-02 | 浙江瑞银电子有限公司 | High-precision harmonic three-phase electric energy meter |
| CN115598409A (en) * | 2022-11-01 | 2023-01-13 | 深圳国爱全电化智慧科技有限公司（Cn） | Electric fire stove power detection circuit and electric fire stove |
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