CN104865428A - Automatic switching device of three-phase three-wire electric energy meter and three-phase four-wire electric energy meter - Google Patents
Automatic switching device of three-phase three-wire electric energy meter and three-phase four-wire electric energy meter Download PDFInfo
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Abstract
The invention discloses an automatic switching device of a three-phase three-wire electric energy meter and a three-phase four-wire electric energy meter. The automatic switching device comprises a rectification circuit, a three-phase electric energy metering chip U2 with metering mode selecting ports, and a three-phase electricity judgment circuit. An input end of the rectification circuit is connected with a three-phase power supply access end of an electric energy meter. Output ends of the rectification circuit are respectively connected with a first system isolation power supply module and the three-phase electricity judgment circuit. An output end of the three-phase electricity judgment circuit is connected with the metering mode selecting port of the three-phase electric energy metering chip U2. The first system isolation power supply module supplies power to each circuit module of the electric energy meter and the three-phase electric energy metering chip U2. According to the invention, the three-phase electricity judgment circuit judges whether a connected three-phase power supply is a three-phase three-wire power supply through hardware circuits and outputs corresponding control signals to the metering mode selecting ports of the three-phase electric energy metering chip U2, and the three-phase electric energy metering chip U2 selects corresponding metering modes according to the control signals.
Description
Technical field
The present invention relates to three-phase electric energy meter field, particularly relate to the automatic switching control equipment of a kind of three-phase three-wire electric energy meter and three-phase and four-line electric energy meter.
Background technology
The metering method of threephase AC electric energy is divided into phase three-wire three, three-phase and four-line two kinds.Accordingly, two kinds of three-phase electric energy meters are just had: three-phase three-wire electric energy meter and three-phase and four-line electric energy meter.During Utilities Electric Co.'s buying three-phase electric energy meter, this two large class must be divided to purchase.When electrician installs electric energy meter, also need to distinguish this two kinds of different metering methods, required three-phase electric energy meter is installed.
Domestic existing self-adaptation three-phase electric energy meter, the method for the magnitude of voltage accessed by software interpretation or voltage angle, switches different metering methods.The program goes wrong already, such as: when the situations such as voltage ripple of power network, network load change occur, this all will affect the sentence read result of software, cause three-phase electric energy meter to measure or erroneous metrology.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, the automatic switching control equipment of a kind of three-phase three-wire electric energy meter and three-phase and four-line electric energy meter is provided, no matter the power supply of three-phase electric energy meter access is three-phase three-wire system, or three-phase four-wire system, the mode that three-phase electric energy meter can be judged with hardware by three-phase electricity decision circuitry, makes electric energy meter automatically switch to the metering method corresponding with accessed three-phase electricity.
The object of the invention is to be achieved through the following technical solutions: the automatic switching control equipment of three-phase three-wire electric energy meter and three-phase and four-line electric energy meter, it comprises rectification circuit, has three-phase electrical energy computation chip U2 and three-phase electricity decision circuitry that metering method selects port.
The input end of rectification circuit is connected with the three-phase supply incoming end of electric energy meter, the output terminal of rectification circuit is connected with the input anode of the first system insulating power supply module and three-phase electricity decision circuitry respectively, the input cathode of three-phase electricity decision circuitry is connected with the N line of three-phase supply, the output terminal of three-phase electricity decision circuitry selects port to be connected with the metering method of three-phase electrical energy computation chip U2, and the first system insulating power supply module is that each circuit module of electric energy meter and three-phase electrical energy computation chip U2 power.
By hardware circuit, three-phase electricity decision circuitry judges whether the three-phase supply accessed is three-phase and four-line electricity, and exporting the metering method selection port of corresponding control signal to three-phase electrical energy computation chip U2, three-phase electrical energy computation chip U2 selects corresponding metering method according to this control signal.
During described rectification circuit employing full-bridge rectification mode, this rectification circuit comprises rectifier bridge stack BG1, rectifier bridge stack BG2 and rectifier bridge stack BG3.
Rectifier bridge stack BG1, rectifier bridge stack BG2 are all connected with the positive pole of the output terminal of rectification circuit with the output head anode of rectifier bridge stack BG3, and rectifier bridge stack BG1, rectifier bridge stack BG2, rectifier bridge stack BG3, rectifier bridge stack BG4 are all connected with the negative pole of the output terminal of rectification circuit with the negative pole of output end of rectifier bridge stack BG5.
The input end AC1 of rectifier bridge stack BG1 is connected with the A line of three-phase supply, and the input end AC2 of rectifier bridge stack BG1 is connected with the N line of three-phase supply.
The input end AC1 of rectifier bridge stack BG2 is connected with the B line of three-phase supply, and the input end AC2 of rectifier bridge stack BG2 is connected with the N line of three-phase supply.
The input end AC1 of rectifier bridge stack BG3 is connected with the C line of three-phase supply, and the input end AC2 of rectifier bridge stack BG3 is connected with the N line of three-phase supply.
During described rectification circuit employing half-wave rectification mode, this rectification circuit comprises the first half-wave rectifying circuit and the second half-wave rectifying circuit, also comprises second system insulating power supply module.
When the three-phase supply accessed is three-phase and four-line electricity, the first system insulating power supply module is that each circuit module of electric energy meter and three-phase electrical energy computation chip U2 power, and second system insulating power supply module also works simultaneously.
When the three-phase supply accessed is phase three-wire three electricity, second system insulating power supply module is that each circuit module of electric energy meter and three-phase electrical energy computation chip U2 power, and the first system insulating power supply module does not work.
The input end of described first half-wave rectifying circuit is connected with the A line of three-phase supply, B line and C line respectively, the output terminal of the first half-wave rectifying circuit is connected with the input anode of the first system insulating power supply module, and the input cathode of the first system insulating power supply module is connected with the N line of three-phase supply.
The input end of described second half-wave rectifying circuit is connected with the A line of three-phase supply and C line respectively, the output terminal of the second half-wave rectifying circuit is connected with the input anode of second system insulating power supply module, and the input cathode of second system insulating power supply module is connected with the B line of three-phase supply.
Described first half-wave rectifying circuit comprises commutation diode D1, commutation diode D2 and commutation diode D3, and described second half-wave rectifying circuit comprises commutation diode D4 and commutation diode D5.
Commutation diode D1, commutation diode D2 are all connected with the output terminal of the first half-wave rectifying circuit with the negative pole of commutation diode D3, and commutation diode D4 is all connected with the output terminal of the second half-wave rectifying circuit with the negative pole of commutation diode D5.
The positive pole of commutation diode D1 is connected with the A line of three-phase supply.
The positive pole of commutation diode D2 is connected with the B line of three-phase supply.
The positive pole of commutation diode D3 is connected with the C line of three-phase supply.
The positive pole of commutation diode D4 is connected with the A line of three-phase supply.
The positive pole of commutation diode D5 is connected with the C line of three-phase supply.
Described the first system insulating power supply module has the function of three-phase electricity decision circuitry, and the first system insulating power supply module comprises three-phase electricity decision circuitry.
When the three-phase supply accessed is three-phase and four-line electricity, the first system insulating power supply module work, its DC power output end VCC selects port to export high-level control signal to the metering method of three-phase electrical energy computation chip U2, and three-phase electrical energy computation chip U2 selects three-phase and four-line metering method.
When the three-phase supply accessed is phase three-wire three electricity, the first system insulating power supply module does not work, its DC power output end VCC selects port output low level control signal to the metering method of three-phase electrical energy computation chip U2, and three-phase electrical energy computation chip U2 selects phase three-wire three metering method.
Described the first system insulating power supply module also selects port to be connected by current-limiting resistance R3 with the metering method of three-phase electrical energy computation chip U2.
Described the first system insulating power supply module also by pull down resistor R4 with dock.
Described three-phase electricity decision circuitry comprises photoelectrical coupler U1, when the three-phase supply accessed is three-phase and four-line electricity, photoelectrical coupler U1 conducting, the output terminal of three-phase electricity decision circuitry selects port output low level control signal to the metering method of three-phase electrical energy computation chip U2, when the three-phase supply accessed is phase three-wire three electricity, photoelectrical coupler U1 not conducting, the output terminal of three-phase electricity decision circuitry selects port to export high-level control signal to the metering method of three-phase electrical energy computation chip U2.
The output head anode of photoelectrical coupler U1 is connected with the output terminal of three-phase electricity decision circuitry and a DC power output end VCC of the first system insulating power supply module respectively, the negative pole of output end of photoelectrical coupler U1 with dock, the input anode of photoelectrical coupler U1 is connected with the positive pole of the output terminal of rectification circuit, and the input cathode of photoelectrical coupler U1 is connected with three-phase supply N line.
Described three-phase electricity decision circuitry also comprises current-limiting resistance R1, and for the protection of the input end of photoelectrical coupler U1, current-limiting resistance R1 is connected between the output head anode of rectification circuit and the input anode of photoelectrical coupler U1.
Described three-phase electricity decision circuitry also comprises filter capacitor C1, and filter capacitor C1 is connected in parallel between the input anode of photoelectrical coupler U1 and the input cathode of photoelectrical coupler U1.
Described three-phase electricity decision circuitry also comprises pull-up resistor R2, and pull-up resistor R2 is connected between the output head anode of photoelectrical coupler U1 and a DC power output end VCC of the first system insulating power supply module.
Also comprise reverse swing door circuit, before described reverse swing door circuit is arranged on the metering method selection port of three-phase electrical energy computation chip U2, for control signal being carried out oppositely adjustment to adapt to different three-phase electrical energy computation chip U2.
Described three-phase electrical energy computation chip U2 comprises ATT7022E chip, and described metering method selects port to comprise the SEL pin of ATT7022E chip.
The invention has the beneficial effects as follows:
1) the invention provides the automatic switching control equipment of a kind of three-phase three-wire electric energy meter and three-phase and four-line electric energy meter, no matter the power supply of three-phase electric energy meter access is three-phase three-wire system, or three-phase four-wire system, the mode that three-phase electric energy meter can be judged with hardware by three-phase electricity decision circuitry, makes electric energy meter automatically switch to the metering method corresponding with accessed three-phase electricity.
2) instant invention overcomes the existing problem coming existing for interpretation access magnitude of voltage or voltage angle the self-adaptation three-phase electric energy meter of the metering method that automatically switches by software, with hardware circuit come interpretation access the type of three-phase electricity, and automatically control three-phase electrical energy computation chip and adopt corresponding metering method.
3) automatic switching control equipment proposed by the invention, can not by the impact of electrical network exception, and occur whether three-phase electric energy meter measures or the phenomenon of erroneous metrology, when the situations such as voltage ripple of power network, network load change occur, adopt the three-phase electric energy meter meter of automatic switching control equipment of the present invention that correct metering method can be selected normally to carry out electric energy metrical.
4) the present invention at least comprises three kinds of embodiments:
1. adopt full-bridge rectification mode, whether have access to zero line by photoelectrical coupler automatic decision, namely whether there is phase voltage, control three-phase electrical energy computation chip and select correct metering method;
2. half-wave rectification mode is adopted, also whether zero line is had access to by photoelectrical coupler automatic decision, namely whether there is phase voltage, control three-phase electrical energy computation chip and select correct metering method, and two isolation of system power modules are set to ensure the normal work of electric energy meter;
3. half-wave rectification mode is adopted, two isolation of system power modules are set to ensure the normal work of electric energy meter, independently photoelectrical coupler decision circuitry is not set, judge whether to have access to zero line by the duty of the first system insulating power supply module itself, and control three-phase electrical energy computation chip with this and select correct metering method.
5) the present invention also can set up reverse swing door circuit, to adapt to different three-phase electrical energy computation chips, because metering method selects port when receiving low and high level control signal, metering method corresponding to it may be different, a reverse swing door circuit is set up between three-phase electrical energy computation chip and photoelectric coupling circuit, three-phase electrical energy computation chip can be avoided to receive control signal after, the metering method of execution error.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of the embodiment one of automatic switching control equipment of the present invention;
Fig. 2 is the pin configuration figure of the embodiment two of automatic switching control equipment of the present invention;
Fig. 3 is the pin configuration figure of the embodiment three of automatic switching control equipment of the present invention;
Fig. 4 is the pin configuration figure of ATT7022E chip in the present invention.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail, but protection scope of the present invention is not limited to the following stated.
The automatic switching control equipment of three-phase three-wire electric energy meter and three-phase and four-line electric energy meter, it comprises rectification circuit, has three-phase electrical energy computation chip U2 and three-phase electricity decision circuitry that metering method selects port.
The input end of rectification circuit is connected with the three-phase supply incoming end of electric energy meter, the output terminal of rectification circuit is connected with the input anode of the first system insulating power supply module and three-phase electricity decision circuitry respectively, the input cathode of three-phase electricity decision circuitry is connected with the N line of three-phase supply, the output terminal of three-phase electricity decision circuitry selects port to be connected with the metering method of three-phase electrical energy computation chip U2, and the first system insulating power supply module is that each circuit module of electric energy meter and three-phase electrical energy computation chip U2 power.
By hardware circuit, three-phase electricity decision circuitry judges whether the three-phase supply accessed is three-phase and four-line electricity, and exporting the metering method selection port of corresponding control signal to three-phase electrical energy computation chip U2, three-phase electrical energy computation chip U2 selects corresponding metering method according to this control signal.
The mode that the present invention is judged with hardware by three-phase electricity decision circuitry, makes electric energy meter automatically switch to the metering method corresponding with accessed three-phase electricity.
The present invention also arranges a reverse swing door circuit, before described reverse swing door circuit is arranged on the metering method selection port of three-phase electrical energy computation chip U2, for control signal being carried out oppositely adjustment to adapt to different three-phase electrical energy computation chip U2.
The first system insulating power supply in the present invention and second system insulating power supply all can be AC/DC power module.
(1) full-bridge rectification mode
As shown in Figure 1, during described rectification circuit employing full-bridge rectification mode, this rectification circuit comprises rectifier bridge stack BG1, rectifier bridge stack BG2 and rectifier bridge stack BG3.
Rectifier bridge stack BG1, rectifier bridge stack BG2 are all connected with the positive pole of the output terminal of rectification circuit with the output head anode of rectifier bridge stack BG3, and rectifier bridge stack BG1, rectifier bridge stack BG2, rectifier bridge stack BG3, rectifier bridge stack BG4 are all connected with the negative pole of the output terminal of rectification circuit with the negative pole of output end of rectifier bridge stack BG5.The input end AC1 of rectifier bridge stack BG1 is connected with the A line of three-phase supply, and the input end AC2 of rectifier bridge stack BG1 is connected with the N line of three-phase supply.The input end AC1 of rectifier bridge stack BG2 is connected with the B line of three-phase supply, and the input end AC2 of rectifier bridge stack BG2 is connected with the N line of three-phase supply.The input end AC1 of rectifier bridge stack BG3 is connected with the C line of three-phase supply, and the input end AC2 of rectifier bridge stack BG3 is connected with the N line of three-phase supply.
Described three-phase electricity decision circuitry comprises photoelectrical coupler U1, when the three-phase supply accessed is three-phase and four-line electricity, photoelectrical coupler U1 conducting, the output terminal of three-phase electricity decision circuitry selects port output low level control signal to the metering method of three-phase electrical energy computation chip U2, when the three-phase supply accessed is phase three-wire three electricity, photoelectrical coupler U1 not conducting, the output terminal of three-phase electricity decision circuitry selects port to export high-level control signal to the metering method of three-phase electrical energy computation chip U2.
The output head anode of photoelectrical coupler U1 is connected with the output terminal of three-phase electricity decision circuitry and a DC power output end VCC of the first system insulating power supply module respectively, the negative pole of output end of photoelectrical coupler U1 with dock, the input anode of photoelectrical coupler U1 is connected with the positive pole of the output terminal of rectification circuit, and the input cathode of photoelectrical coupler U1 is connected with three-phase supply N line.
Described three-phase electricity decision circuitry also comprises current-limiting resistance R1, and for the protection of the input end of photoelectrical coupler U1, current-limiting resistance R1 is connected between the output head anode of rectification circuit and the input anode of photoelectrical coupler U1.
Described three-phase electricity decision circuitry also comprises filter capacitor C1, and filter capacitor C1 is connected in parallel between the input anode of photoelectrical coupler U1 and the input cathode of photoelectrical coupler U1.
Described three-phase electricity decision circuitry also comprises pull-up resistor R2, and pull-up resistor R2 is connected between the output head anode of photoelectrical coupler U1 and a DC power output end VCC of the first system insulating power supply module.
In this embodiment one, only when the three-phase supply accessed has zero line, when being three-phase and four-line electricity, the input end (i.e. light-emitting diodes pipe end) of photoelectrical coupler U1 will have electric current to pass through, photoelectrical coupler U1 in circuit is by saturation conduction, photoelectrical coupler U1 output terminal is dragged down, three-phase electricity decision circuitry output terminal output low level control signal, and this control signal is through reverse swing door circuit or can control three-phase electrical energy computation chip U2 without reverse swing door circuit and enter three-phase and four-line metering method.
If when the three-phase supply of access is phase three-wire three, although rectification circuit has output, the first system insulating power supply also has output, but because do not access zero line, the input end no current of photoelectrical coupler U1 is passed through, the output terminal of photoelectrical coupler U1 is not dragged down, and three-phase electricity decision circuitry output terminal exports high-level control signal, and this control signal is through reverse swing door circuit or can control three-phase electrical energy computation chip U2 without reverse swing door circuit and enter phase three-wire three metering method.
As a specific embodiment, the present invention can adopt three models to be the rectifier bridge stack of KBP210, employing model is the photoelectrical coupler U1 of PC817, employing specification is the electric capacity C1 of 10 μ F/16V, and adopt the ATT7022E three-phase electrical energy computation chip U2 of Zhuhai torch power, resistance R1 can adopt resistance 474, namely employing resistance is the resistance of 470K Ω, resistance R2 can adopt resistance 303, and namely employing resistance is the resistance of 30K Ω, and the magnitude of voltage of DC power output end VCC can be set to 33V.
(2) half-wave rectification mode
During described rectification circuit employing half-wave rectification mode, this rectification circuit comprises the first half-wave rectifying circuit and the second half-wave rectifying circuit, also comprises second system insulating power supply module.
When the three-phase supply accessed is three-phase and four-line electricity, the first system insulating power supply module is that each circuit module of electric energy meter and three-phase electrical energy computation chip U2 power, and second system insulating power supply module also works simultaneously.
When the three-phase supply accessed is phase three-wire three electricity, second system insulating power supply module is that each circuit module of electric energy meter and three-phase electrical energy computation chip U2 power, and the first system insulating power supply module does not work.
The input end of described first half-wave rectifying circuit is connected with the A line of three-phase supply, B line and C line respectively, the output terminal of the first half-wave rectifying circuit is connected with the input anode of the first system insulating power supply module, and the input cathode of the first system insulating power supply module is connected with the N line of three-phase supply.
The input end of described second half-wave rectifying circuit is connected with the A line of three-phase supply and C line respectively, the output terminal of the second half-wave rectifying circuit is connected with the input anode of second system insulating power supply module, and the input cathode of second system insulating power supply module is connected with the B line of three-phase supply.
Described first half-wave rectifying circuit comprises commutation diode D1, commutation diode D2 and commutation diode D3, and described second half-wave rectifying circuit comprises commutation diode D4 and commutation diode D5.
Commutation diode D1, commutation diode D2 are all connected with the output terminal of the first half-wave rectifying circuit with the negative pole of commutation diode D3, and commutation diode D4 is all connected with the output terminal of the second half-wave rectifying circuit with the negative pole of commutation diode D5.
The positive pole of commutation diode D1 is connected with the A line of three-phase supply.
The positive pole of commutation diode D2 is connected with the B line of three-phase supply.
The positive pole of commutation diode D3 is connected with the C line of three-phase supply.
The positive pole of commutation diode D4 is connected with the A line of three-phase supply.
The positive pole of commutation diode D5 is connected with the C line of three-phase supply.
(1) without the half-wave rectification mode of optocoupler decision circuitry
As shown in Figure 2, described the first system insulating power supply module has the function of three-phase electricity decision circuitry, and the first system insulating power supply module comprises three-phase electricity decision circuitry.
When the three-phase supply accessed is three-phase and four-line electricity, the first system insulating power supply module work, its DC power output end VCC selects port to export high-level control signal to the metering method of three-phase electrical energy computation chip U2, and this control signal is through reverse swing door circuit or can control three-phase electrical energy computation chip U2 without reverse swing door circuit and enter three-phase and four-line metering method.
When the three-phase supply accessed is phase three-wire three electricity, the first system insulating power supply module does not work, its DC power output end VCC selects port output low level control signal to the metering method of three-phase electrical energy computation chip U2, and this control signal is through reverse swing door circuit or can control three-phase electrical energy computation chip U2 without reverse swing door circuit and enter phase three-wire three metering method.
Described the first system insulating power supply module also selects port to be connected by current-limiting resistance R3 with the metering method of three-phase electrical energy computation chip U2, and current-limiting resistance R3 is for the protection of three-phase electrical energy computation chip U2.
Described the first system insulating power supply module also by pull down resistor R4 with dock.
In this embodiment two, because circuit exists two isolation of system power supplys, the first system insulating power supply is three-phase four-wire power, and second system insulating power supply is phase three-wire three power supply.When access is three-phase and four-line, two isolation of system power supplys all work, and two isolation of system power supplys all have output (VCC, VCC_1 all have output).Now Direct driver three-phase electrical energy computation chip U2 is entered three-phase and four-line metering method by the first system insulating power supply.When access is phase three-wire three, only have the work of second system insulating power supply, the input end of the first system insulating power supply and the N line of three-phase supply do not form loop, and the first system insulating power supply non-transformer exports.Then the metering method control end of three-phase electrical energy computation chip U2 is dragged down, and three-phase electrical energy computation chip U2 enters phase three-wire three metering method.
(2) the half-wave rectification mode of optocoupler decision circuitry is had
As shown in Figure 3, described three-phase electricity decision circuitry comprises photoelectrical coupler U1, when the three-phase supply accessed is three-phase and four-line electricity, photoelectrical coupler U1 conducting, the output terminal of three-phase electricity decision circuitry selects port output low level control signal to the metering method of three-phase electrical energy computation chip U2, when the three-phase supply accessed is phase three-wire three electricity, photoelectrical coupler U1 not conducting, the output terminal of three-phase electricity decision circuitry selects port to export high-level control signal to the metering method of three-phase electrical energy computation chip U2.
The output head anode of photoelectrical coupler U1 is connected with the output terminal of three-phase electricity decision circuitry and a DC power output end VCC of the first system insulating power supply module respectively, the negative pole of output end of photoelectrical coupler U1 with dock, the input anode of photoelectrical coupler U1 is connected with the positive pole of the output terminal of rectification circuit, and the input cathode of photoelectrical coupler U1 is connected with three-phase supply N line.
Described three-phase electricity decision circuitry also comprises current-limiting resistance R1, and for the protection of the input end of photoelectrical coupler U1, current-limiting resistance R1 is connected between the output head anode of rectification circuit and the input anode of photoelectrical coupler U1.
Described three-phase electricity decision circuitry also comprises filter capacitor C1, and filter capacitor C1 is connected in parallel between the input anode of photoelectrical coupler U1 and the input cathode of photoelectrical coupler U1.
Described three-phase electricity decision circuitry also comprises pull-up resistor R2, and pull-up resistor R2 is connected between the output head anode of photoelectrical coupler U1 and a DC power output end VCC of the first system insulating power supply module.
In this embodiment three, when access be three-phase four-wire system time, the input end of photoelectrical coupler U1 and the N line (zero line) of three-phase supply form loop, photoelectrical coupler U1 has electric current to pass through, three-phase electricity decision circuitry output low level control signal, this control signal is through reverse swing door circuit or can control three-phase electrical energy computation chip U2 without reverse swing door circuit and enter three-phase and four-line metering method.
When access be phase three-wire three time, the input end of photoelectrical coupler U1 and the N line (zero line) of three-phase supply do not form loop, photoelectrical coupler U1 no current passes through, photoelectrical coupler U1 does not work, and the first system insulating power supply non-transformer exports, namely three-phase electricity decision circuitry exports high-level control signal, and this control signal is through reverse swing door circuit or can control three-phase electrical energy computation chip U2 without reverse swing door circuit and enter phase three-wire three metering method.
(3) three-phase electrical energy computation chip
Three-phase electrical energy computation chip U2 generally has a phase three-wire three/three-phase and four-line metering method base pin selection, such as ATT7022E chip, and certain the present invention does not limit and uses ATT7022E chip.In the present invention, described three-phase electrical energy computation chip U2 comprises ATT7022E chip, and described metering method selects port to comprise the SEL pin of ATT7022E chip.
As shown in Figure 4, ATT7022E chip adopts LQFP44 packing forms, there are 44 Pin pin, wherein, 26th pin SEL pin is exactly phase three-wire three/three-phase and four-line metering method base pin selection, the SEL pin of ATT7022E chip is connected with the output head anode of photoelectrical coupler U1, is also connected with working power VCC by resistance R2.
In ATT7022E chip, when SEL pin receives low level control signal, three-phase electrical energy computation chip U2 selects to carry out phase three-wire three metering method, and when SEL pin receives high-level control signal, three-phase electrical energy computation chip U2 selects to carry out three-phase and four-line metering method.Therefore SEL pin need receive the photoelectric coupling circuit control signal that send by reverse swing door circuit.
Such as, in embodiment one, when three-phase electric energy meter access three-phase four-wire system three-phase electricity, the direct current that rectification circuit exports is that filter capacitor C1 charges by current-limiting resistance R1, when after filter capacitor C1 charging complete, photoelectrical coupler U1 conducting, its output head grounding, the control signal that three-phase electricity decision circuitry is exported drags down as low level, again by after reverse swing door circuit, SEL pin receives high-level control signal, and ATT7022E chip selection three-phase and four-line metering method starts to carry out electric energy metrical.Now, no matter abnormal if what there is in electrical network, as situations such as voltage ripple of power network, network load changes, photoelectrical coupler is in conducting state all the time, namely ATT7022E chip is made to carry out electric energy metrical with three-phase and four-line metering method all the time, realize the mode judged by hardware, make electric energy meter automatically switch to the metering method corresponding with accessed three-phase electricity.
When three-phase electric energy meter access three-phase three-wire system three-phase electricity, photoelectrical coupler U1 not conducting, the control signal that three-phase electricity decision circuitry exports is always high level signal, again by after reverse swing door circuit, SEL pin receives low level signal, and ATT7022E chip selection phase three-wire three metering method starts to carry out electric energy metrical.No matter abnormal if what there is in electrical network, as situations such as voltage ripple of power network, network load changes, photoelectrical coupler is in off-state all the time, namely makes ATT7022E chip carry out electric energy metrical with phase three-wire three metering method all the time.
In like manner known, ATT7022E chip principle of work in other embodiments.
Its protection domain of the description of the specific embodiment of the present invention is defined by the appended claims.Those skilled in the art, under the prerequisite not deviating from principle of the present invention and essence, may make and changing and amendment, but these change and amendment all can fall into protection scope of the present invention.
Claims (10)
1. the automatic switching control equipment of three-phase three-wire electric energy meter and three-phase and four-line electric energy meter, is characterized in that: it comprises rectification circuit, has three-phase electrical energy computation chip U2 and three-phase electricity decision circuitry that metering method selects port;
The input end of rectification circuit is connected with the three-phase supply incoming end of electric energy meter, the output terminal of rectification circuit is connected with the input anode of the first system insulating power supply module and three-phase electricity decision circuitry respectively, the input cathode of three-phase electricity decision circuitry is connected with the N line of three-phase supply, for judging whether the three-phase supply accessed is three-phase and four-line electricity, and export corresponding control signal, the output terminal of three-phase electricity decision circuitry selects port to be connected with the metering method of three-phase electrical energy computation chip U2, the control signal of three-phase electrical energy computation chip U2 received by it selects corresponding metering method, the first system insulating power supply module is that each circuit module of electric energy meter and three-phase electrical energy computation chip U2 power.
2. the automatic switching control equipment of three-phase three-wire electric energy meter according to claim 1 and three-phase and four-line electric energy meter, it is characterized in that: during described rectification circuit employing full-bridge rectification mode, this rectification circuit comprises rectifier bridge stack BG1, rectifier bridge stack BG2 and rectifier bridge stack BG3;
Rectifier bridge stack BG1, rectifier bridge stack BG2 are all connected with the positive pole of the output terminal of rectification circuit with the output head anode of rectifier bridge stack BG3, and rectifier bridge stack BG1, rectifier bridge stack BG2, rectifier bridge stack BG3, rectifier bridge stack BG4 are all connected with the negative pole of the output terminal of rectification circuit with the negative pole of output end of rectifier bridge stack BG5;
The input end AC1 of rectifier bridge stack BG1 is connected with the A line of three-phase supply, and the input end AC2 of rectifier bridge stack BG1 is connected with the N line of three-phase supply;
The input end AC1 of rectifier bridge stack BG2 is connected with the B line of three-phase supply, and the input end AC2 of rectifier bridge stack BG2 is connected with the N line of three-phase supply;
The input end AC1 of rectifier bridge stack BG3 is connected with the C line of three-phase supply, and the input end AC2 of rectifier bridge stack BG3 is connected with the N line of three-phase supply.
3. the automatic switching control equipment of three-phase three-wire electric energy meter according to claim 1 and three-phase and four-line electric energy meter, it is characterized in that: during described rectification circuit employing half-wave rectification mode, this rectification circuit comprises the first half-wave rectifying circuit and the second half-wave rectifying circuit, also comprises second system insulating power supply module;
When the three-phase supply accessed is three-phase and four-line electricity, the first system insulating power supply module is that each circuit module of electric energy meter and three-phase electrical energy computation chip U2 power, and second system insulating power supply module also works simultaneously;
When the three-phase supply accessed is phase three-wire three electricity, second system insulating power supply module is that each circuit module of electric energy meter and three-phase electrical energy computation chip U2 power, and the first system insulating power supply module does not work;
The input end of described first half-wave rectifying circuit is connected with the A line of three-phase supply, B line and C line respectively, the output terminal of the first half-wave rectifying circuit is connected with the input anode of the first system insulating power supply module, and the input cathode of the first system insulating power supply module is connected with the N line of three-phase supply;
The input end of described second half-wave rectifying circuit is connected with the A line of three-phase supply and C line respectively, the output terminal of the second half-wave rectifying circuit is connected with the input anode of second system insulating power supply module, and the input cathode of second system insulating power supply module is connected with the B line of three-phase supply.
4. the automatic switching control equipment of three-phase three-wire electric energy meter according to claim 3 and three-phase and four-line electric energy meter, it is characterized in that: described first half-wave rectifying circuit comprises commutation diode D1, commutation diode D2 and commutation diode D3, described second half-wave rectifying circuit comprises commutation diode D4 and commutation diode D5;
Commutation diode D1, commutation diode D2 are all connected with the output terminal of the first half-wave rectifying circuit with the negative pole of commutation diode D3, and commutation diode D4 is all connected with the output terminal of the second half-wave rectifying circuit with the negative pole of commutation diode D5;
The positive pole of commutation diode D1 is connected with the A line of three-phase supply;
The positive pole of commutation diode D2 is connected with the B line of three-phase supply;
The positive pole of commutation diode D3 is connected with the C line of three-phase supply;
The positive pole of commutation diode D4 is connected with the A line of three-phase supply;
The positive pole of commutation diode D5 is connected with the C line of three-phase supply.
5. the automatic switching control equipment of three-phase three-wire electric energy meter according to claim 3 and three-phase and four-line electric energy meter, it is characterized in that: described the first system insulating power supply module has the function of three-phase electricity decision circuitry, the first system insulating power supply module comprises three-phase electricity decision circuitry;
When the three-phase supply accessed is three-phase and four-line electricity, the first system insulating power supply module work, its DC power output end VCC selects port to export high-level control signal to the metering method of three-phase electrical energy computation chip U2, and three-phase electrical energy computation chip U2 selects three-phase and four-line metering method;
When the three-phase supply accessed is phase three-wire three electricity, the first system insulating power supply module does not work, its DC power output end VCC selects port output low level control signal to the metering method of three-phase electrical energy computation chip U2, and three-phase electrical energy computation chip U2 selects phase three-wire three metering method.
6. the automatic switching control equipment of three-phase three-wire electric energy meter according to claim 5 and three-phase and four-line electric energy meter, is characterized in that: described the first system insulating power supply module also selects port to be connected by current-limiting resistance R3 with the metering method of three-phase electrical energy computation chip U2;
Described the first system insulating power supply module also by pull down resistor R4 with dock.
7. the automatic switching control equipment of the three-phase three-wire electric energy meter according to claim 1 or 3 and three-phase and four-line electric energy meter, it is characterized in that: described three-phase electricity decision circuitry comprises photoelectrical coupler U1, when the three-phase supply accessed is three-phase and four-line electricity, photoelectrical coupler U1 conducting, the output terminal of three-phase electricity decision circuitry selects port output low level control signal to the metering method of three-phase electrical energy computation chip U2, when the three-phase supply accessed is phase three-wire three electricity, photoelectrical coupler U1 not conducting, the output terminal of three-phase electricity decision circuitry selects port to export high-level control signal to the metering method of three-phase electrical energy computation chip U2,
The output head anode of photoelectrical coupler U1 is connected with the output terminal of three-phase electricity decision circuitry and a DC power output end VCC of the first system insulating power supply module respectively, the negative pole of output end of photoelectrical coupler U1 with dock, the input anode of photoelectrical coupler U1 is connected with the positive pole of the output terminal of rectification circuit, and the input cathode of photoelectrical coupler U1 is connected with three-phase supply N line.
8. the automatic switching control equipment of three-phase three-wire electric energy meter according to claim 7 and three-phase and four-line electric energy meter, it is characterized in that: described three-phase electricity decision circuitry also comprises current-limiting resistance R1, for the protection of the input end of photoelectrical coupler U1, current-limiting resistance R1 is connected between the output head anode of rectification circuit and the input anode of photoelectrical coupler U1;
Described three-phase electricity decision circuitry also comprises filter capacitor C1, and filter capacitor C1 is connected in parallel between the input anode of photoelectrical coupler U1 and the input cathode of photoelectrical coupler U1;
Described three-phase electricity decision circuitry also comprises pull-up resistor R2, and pull-up resistor R2 is connected between the output head anode of photoelectrical coupler U1 and a DC power output end VCC of the first system insulating power supply module.
9. the automatic switching control equipment of three-phase three-wire electric energy meter according to claim 1 and three-phase and four-line electric energy meter, it is characterized in that: also comprise reverse swing door circuit, before described reverse swing door circuit is arranged on the metering method selection port of three-phase electrical energy computation chip U2, for control signal being carried out oppositely adjustment to adapt to different three-phase electrical energy computation chip U2.
10. the automatic switching control equipment of three-phase three-wire electric energy meter according to claim 1 and three-phase and four-line electric energy meter, it is characterized in that: described three-phase electrical energy computation chip U2 comprises ATT7022E chip, described metering method selects port to comprise the SEL pin of ATT7022E chip.
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| CN201510234742.5A CN104865428B (en) | 2015-04-22 | 2015-05-11 | The automatic switching control equipment of three-phase three-wire electric energy meter and three-phase and four-line electric energy meter |
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| US11061055B2 (en) | 2019-03-15 | 2021-07-13 | Analog Devices International Unlimited Company | Three-phase power meter monitoring for star and delta configurations |
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| US11061055B2 (en) | 2019-03-15 | 2021-07-13 | Analog Devices International Unlimited Company | Three-phase power meter monitoring for star and delta configurations |
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