CN201811993U - Three-phase four-line low-power energy meter with switching power supply - Google Patents
Three-phase four-line low-power energy meter with switching power supply Download PDFInfo
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- CN201811993U CN201811993U CN2010202769966U CN201020276996U CN201811993U CN 201811993 U CN201811993 U CN 201811993U CN 2010202769966 U CN2010202769966 U CN 2010202769966U CN 201020276996 U CN201020276996 U CN 201020276996U CN 201811993 U CN201811993 U CN 201811993U
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Abstract
The utility model discloses a three-phase four-line low-power energy meter with a switching power supply. The switching power supply of the energy meter is respectively connected with an electric energy metering module, a communication module and a central processing unit, the electric energy metering module, the communication module, a data output module and a data input module are respectively connected into the central processing unit, a high-frequency filter interference circuit of a switching power module is connected with a switching voltage stabilizing power circuit, a zero line judging circuit and a voltage stabilizing circuit with a line strobe function are arranged between a rectifying circuit and the high-frequency filter interference circuit, the rectifying circuit is respectively connected with the zero line judging circuit and the voltage stabilizing circuit with a line strobe function, both the zero line judging circuit and the voltage stabilizing circuit with a line strobe function are connected into the high-frequency filter interference circuit, and a control signal output end of the zero line judging circuit is connected with the voltage stabilizing circuit with a line strobe function. The three-phase four-line low-power energy meter with a switching power supply has the advantages that power consumption of the energy meter is reduced by 60%-70% compared with a common three-phase energy meter, power sources are saved, and the three-phase four-line energy meter can be operated under the condition without a zero line.
Description
Technical field
The utility model relates to the three-phase electric energy meter technical field, is specifically related to a kind of three-phase and four-line low-power consumption Switching Power Supply electric energy table.
Technical background
Existing three-phase and four-line electric energy meter generally adopts the transformer scheme power supply, and it isolates anti-interference effective, and is reliable and stable, but power consumption is bigger, the cost height.Along with reaching its maturity of switch power technology, the technician begins to attempt to use the scheme power supply of Switching Power Supply in the three-phase and four-line electric energy meter, and it is bigger to solve in the conventional transformer scheme power consumption, defect of high cost.But on the one hand because the interference rejection capability of Switching Power Supply is relatively poor, on the other hand, if lack zero line in the general three-phase four-wire switching power supply electric energy meter, electric energy meter is cisco unity malfunction, thus Switching Power Supply to the scheme of three-phase and four-line electric energy meter power supply also need not continue perfect.
Summary of the invention
Order of the present utility model is at above-mentioned technical matters, and the power supply of a kind of use Switching Power Supply is provided, interference rejection capability strong and lack under the situation of zero line still can operate as normal three-phase and four-line low-power consumption Switching Power Supply electric energy table.
For realizing this purpose, a kind of three-phase and four-line low-power consumption Switching Power Supply electric energy table that the utility model is designed, it comprises switch power module, the electric energy metrical module, CPU (central processing unit), data outputting module, data input module and communication module, wherein, the output terminal of switch power module connects the electric energy metrical module respectively, communication module and CPU (central processing unit), described electric energy metrical module, communication module, data outputting module, data input module inserts CPU (central processing unit) respectively, it is characterized in that: described switch power module comprises rectification circuit, High frequency filter anti-jamming circuit and switching power supply circuit, wherein, the High frequency filter anti-jamming circuit connects the switching power supply circuit, between described rectification circuit and High frequency filter anti-jamming circuit, be provided with the mu balanced circuit of zero line decision circuitry and band circuit gating function, described rectification circuit connects the input end of zero line decision circuitry respectively and is with the input end of the mu balanced circuit of circuit gating function, the output terminal of the mu balanced circuit of the output terminal of described zero line decision circuitry and band circuit gating function all inserts the High frequency filter anti-jamming circuit, the mu balanced circuit of the control signal output ends connecting band circuit gating function of described zero line decision circuitry.
Described CPU (central processing unit) also is connected with data memory module and relay control unit.
The mu balanced circuit of described band circuit gating function also is connected with the zero line testing circuit.
Described rectification circuit also is connected with protective circuit of switch power source.
Described zero line decision circuitry comprises diode D13, resistance R 12～R15, capacitor C 5, field effect transistor Q2, transient suppressor Z1, wherein, the grid of field effect transistor Q2 connects an end of resistance R 14, the other end of resistance R 14 inserts zero line JN1 by the resistance R 12～R13 and the diode D13 of series connection, connect capacitor C 5 between field effect transistor Q2 source class and the grid, the two ends of capacitor C 5 connect resistance R 15, field effect transistor Q2 source class also connects rectification circuit, connect transient suppressor Z1 between the source class of field effect transistor Q2 and the drain electrode, the mu balanced circuit of connecting band circuit gating function is gone back in the drain electrode of field effect transistor Q2.
The mu balanced circuit of described band circuit gating function comprises resistance R 4～R9, field effect transistor Q1, capacitor C 9, diode D17 and transient suppressor Z2, wherein, the drain electrode of field effect transistor Q1 connects rectification circuit by resistance R 4, connect resistance R 9 between the drain electrode of the grid of field effect transistor Q1 and field effect transistor Q2, resistance in series R5～R8 between the drain electrode of rectification circuit and field effect transistor Q2, connect transient suppressor Z2 between the source class of field effect transistor Q1 and the grid, capacitor C 9 connects the two ends of transient suppressor Z2, and the source class of field effect transistor Q1 also connects the High frequency filter anti-jamming circuit.
Described zero line testing circuit comprises voltage stabilizing diode DZ1, resistance R 10～R11 and photoelectrical coupler OP1, wherein, the negative pole of voltage stabilizing diode DZ1 is connected in the source class of field effect transistor Q1, the positive pole of voltage stabilizing diode DZ1 connects the High frequency filter anti-jamming circuit, the input end of photoelectrical coupler OP1 is by the two ends of resistance R 10～R11 access voltage stabilizing diode DZ1, and the output terminal JI of photoelectrical coupler OP1 is used to connect single-chip microcomputer.
Described rectification circuit comprises diode D1～D12, diode D14～D15, wherein, the negative pole of diode D1 connects the first phase line JA1, the negative pole of diode D4 connects the positive pole of D1, the negative pole of diode D2 connects the second phase line JB1, and the negative pole of diode D6 connects the positive pole of D2, and the negative pole of diode D3 connects third phase line JC1, the negative pole of diode D5 connects the positive pole of D3, the positive pole of the cathode connecting diode D6 of diode D4～D5; The negative pole of the anodal diode D1 of diode D7, the negative pole of the cathode connecting diode D7 of diode D10, the negative pole of the cathode connecting diode D2 of diode D8, the negative pole of the cathode connecting diode D8 of diode D11, the negative pole of the cathode connecting diode D3 of diode D9, the negative pole of the cathode connecting diode D9 of diode D12, the negative pole of diode D10～D12 connects the positive pole of diode D6, the negative pole of diode D14 links to each other with the positive pole of diode D15, the positive pole of diode D14 connects zero line JN1, and the negative pole of diode D15 connects the High frequency filter anti-jamming circuit.
Described protective circuit of switch power source comprises wire-wound resistor R1～R3 and voltage dependent resistor (VDR) ZR1～ZR4; composite thermistor RT1; diode D16～D17; wherein; connecting line is around resistance R 1 between the negative pole of diode D1 and the first phase line JA1; connecting line is around resistance R 2 between the negative pole of diode D2 and the second phase line JB1; connecting line is around resistance R 3 between the negative pole of diode D3 and the third phase line JC1; connect voltage dependent resistor (VDR) ZR1 between the first phase line JA1 and the zero line JN1; connect voltage dependent resistor (VDR) ZR2 between the second phase line JB2 and the zero line JN1; connect voltage dependent resistor (VDR) ZR3 between third phase line JC1 and the zero line JN1; connect voltage dependent resistor (VDR) ZR4 between the negative pole of the positive pole of diode D5 and diode D12, connect composite thermistor RT1 between the negative pole of the positive pole of diode D16 and diode D15.The positive pole of diode D17 connects the zero line testing circuit, inserts the input end of High frequency filter anti-jamming circuit after the negative pole of diode D16 links to each other with the negative pole of diode D17.
Advantage of the present utility model is: by in the three-phase and four-line electric energy meter switch power module being set, make its power consumption reduce by 60%～70% than common three-phase electric energy meter, saved the energy greatly.And by the mu balanced circuit of zero line decision circuitry and band circuit gating function is set in switch power module; the situation that makes the three-phase and four-line electric energy meter lack zero line also can be worked; simultaneously; because the effect protection switch power supply of composite thermistor is not damaged in misphase, has strengthened the practicality and the reliability of three-phase four-wire switching power supply electric energy meter.The utility model also has the advantage that inhibition Conduction Interference ability is strong, reliability is high, power-efficient is high, low in energy consumption.
Description of drawings
Fig. 1 is circuit theory diagrams of the present utility model.
Fig. 2 is the theory diagram of switch power module in the utility model.
Fig. 3 is the circuit theory diagrams of switch power module in the utility model.
Embodiment
The utility model is described in further detail below in conjunction with drawings and Examples:
A kind of three-phase and four-line low-power consumption Switching Power Supply electric energy table as shown in the figure; it comprises switch power module; the electric energy metrical module; CPU (central processing unit); data outputting module; data input module and communication module; wherein; the output terminal of switch power module connects the electric energy metrical module respectively; communication module and CPU (central processing unit); described electric energy metrical module; communication module; data outputting module; data input module inserts CPU (central processing unit) respectively; described switch power module comprises protective circuit of switch power source; rectification circuit; High frequency filter anti-jamming circuit and switching power supply circuit; wherein; protective circuit of switch power source connects rectification circuit; the High frequency filter anti-jamming circuit connects the switching power supply circuit; between rectification circuit and High frequency filter anti-jamming circuit, be provided with the mu balanced circuit of zero line decision circuitry and band circuit gating function; rectification circuit connects the input end of zero line decision circuitry respectively and is with the input end of the mu balanced circuit of circuit gating function; the output terminal of the mu balanced circuit of the output terminal of described zero line decision circuitry and band circuit gating function all inserts the High frequency filter anti-jamming circuit; the mu balanced circuit of the control signal output ends connecting band circuit gating function of zero line decision circuitry; the control signal of zero line decision circuitry output enters the mu balanced circuit of band circuit gating function, is used to control the mu balanced circuit of band circuit gating function and the break-make between the High frequency filter anti-jamming circuit.The mu balanced circuit of band circuit gating function also is connected with the zero line testing circuit, and the zero line testing circuit is used for the signal whether zero line lacks is passed to single-chip microcomputer, and provides the prompting of disappearance zero line.Protective circuit of switch power source is used for preventing impacts such as lightning surge.
In the technique scheme, described CPU (central processing unit) also is connected with data memory module and relay control unit.
In the technique scheme, the zero line decision circuitry comprises diode D13, resistance R 12～R15, capacitor C 5, field effect transistor Q2, transient suppressor Z1, wherein, the grid of field effect transistor Q2 connects an end of resistance R 14, the other end of resistance R 14 inserts zero line JN1 by the resistance R 12～R13 and the diode D13 of series connection, connect capacitor C 5 between field effect transistor Q2 source class and the grid, the two ends of capacitor C 5 connect resistance R 15, field effect transistor Q2 source class also connects rectification circuit, connect transient suppressor Z1 between the source class of field effect transistor Q2 and the drain electrode, the mu balanced circuit of connecting band circuit gating function is gone back in the drain electrode of field effect transistor Q2.Transient suppressor Z1 does not work having under the situation of zero line, in the effect that does not have mainly to play under the situation of zero line pressure limiting.
In the technique scheme, the mu balanced circuit of band circuit gating function comprises resistance R 4～R9, field effect transistor Q1, capacitor C 9, diode D17 and transient suppressor Z2, wherein, the drain electrode of field effect transistor Q1 connects rectification circuit by resistance R 4, connect resistance R 9 between the drain electrode of the grid of field effect transistor Q1 and field effect transistor Q2, resistance in series R5～R8 between the drain electrode of rectification circuit and field effect transistor Q2, connect transient suppressor Z2 between the source class of field effect transistor Q1 and the grid, capacitor C 9 connects the two ends of transient suppressor Z2, and the source class of field effect transistor Q1 also connects the High frequency filter anti-jamming circuit.
In the technique scheme, the zero line testing circuit comprises voltage stabilizing diode DZ1, resistance R 10～R11 and photoelectrical coupler OP1, wherein, the negative pole of voltage stabilizing diode DZ1 is connected in the source class of field effect transistor Q1, the positive pole of voltage stabilizing diode DZ1 connects the High frequency filter anti-jamming circuit, the input end of photoelectrical coupler OP1 is by the two ends of resistance R 10～R11 access voltage stabilizing diode DZ1, and the output terminal JI of photoelectrical coupler OP1 is used to connect single-chip microcomputer.
In the technique scheme, rectification circuit comprises diode D1～D12, diode D14～D15, wherein, the negative pole of diode D1 connects the first phase line JA1, and the negative pole of diode D4 connects the positive pole of D1, and the negative pole of diode D2 connects the second phase line JB1, the negative pole of diode D6 connects the positive pole of D2, the negative pole of diode D3 connects third phase line JC1, and the negative pole of diode D5 connects the positive pole of D3, the positive pole of the cathode connecting diode D6 of diode D4～D5; The negative pole of the anodal diode D1 of diode D7, the negative pole of the cathode connecting diode D7 of diode D10, the negative pole of the cathode connecting diode D2 of diode D8, the negative pole of the cathode connecting diode D8 of diode D11, the negative pole of the cathode connecting diode D3 of diode D9, the negative pole of the cathode connecting diode D9 of diode D12, the negative pole of diode D10～D12 connects the positive pole of diode D6, the negative pole of diode D14 links to each other with the positive pole of diode D15, the positive pole of diode D14 connects zero line JN1, and the negative pole of diode D15 connects the High frequency filter anti-jamming circuit.When zero line was arranged, diode D14～D15 and diode D1～D6 formed the half-bridge rectification circuit; When lacking zero line, diode D1～D12 forms full bridge rectifier.
In the technique scheme; described protective circuit of switch power source comprises wire-wound resistor R1～R3 and voltage dependent resistor (VDR) ZR1～ZR4; composite thermistor RT1; diode D16～D17; wherein; connecting line is around resistance R 1 between the negative pole of diode D1 and the first phase line JA1; connecting line is around resistance R 2 between the negative pole of diode D2 and the second phase line JB1; connecting line is around resistance R 3 between the negative pole of diode D3 and the third phase line JC1; connect voltage dependent resistor (VDR) ZR1 between the first phase line JA1 and the zero line JN1; connect voltage dependent resistor (VDR) ZR2 between the second phase line JB2 and the zero line JN1; connect voltage dependent resistor (VDR) ZR3 between third phase line JC1 and the zero line JN1; connect voltage dependent resistor (VDR) ZR4 between the negative pole of the positive pole of diode D5 and diode D12, connect composite thermistor RT1 between the negative pole of the positive pole of diode D16 and diode D15.The positive pole of diode D17 connects the zero line testing circuit, inserts the input end of High frequency filter anti-jamming circuit after the negative pole of diode D16 links to each other with the negative pole of diode D17.Impacts such as voltage jump that produces when protective circuit of switch power source is used for preventing power-on and power-off and lightning surge.When diode D16～D17 can prevent voltage reversal preceding utmost point element is caused damage.
Field effect transistor Q1 and the preferred metal-oxide-semiconductor field effect transistor of field effect transistor Q2.
The principle of work that the scarce zero line of switch power module of the present utility model is judged is: when zero line JN1 inserts just often, field effect transistor Q2 conducting in the zero line decision circuitry, the drain electrode output LOW voltage of field effect transistor Q2, the grid that this low-voltage inserts field effect transistor Q1 makes field effect transistor Q1 end, the mu balanced circuit part is not worked, each phase line forms the half-bridge rectification circuit with zero line JN3 respectively, be the consumer power supply, because of adopting the half-bridge rectification circuit, output voltage is lower, do not need to use in addition again the reduction voltage circuit step-down, reduced electric energy loss unnecessary in the circuit, improved the utilization factor of power supply greatly.When zero line lacks, Q2 in the zero line decision circuitry ends, the voltage of phase line inserts the grid of the field effect transistor Q1 in the reduction voltage circuit, make field effect transistor Q1 conducting, form the higher full bridge rectifier of voltage between each phase line, this moment, field effect transistor Q1 was operated in conducting state, source voltage increases with grid voltage, simultaneously, when grid voltage is increased to certain value, transient suppressor Z1 a fixed value, guarantees that the Q1 output voltage can be not too high and damage back utmost point element with voltage clamp, and at this moment Q1 is operated in linear condition, the voltage that surpasses fixed value mainly is added on the Q1, Q1 plays hypotensive effect, makes powering for consumer of output voltage stabilization, guarantees its operate as normal.Photoelectrical coupler OP1 in the zero line testing circuit outputs signal to single-chip microcomputer under the situation of disappearance zero line at this moment, and single-chip microcomputer can be by pilot lamp or display reminding user zero line this moment disappearance.Power supply inserts the High frequency filter anti-jamming circuit behind the mu balanced circuit of zero line decision circuitry and band circuit gating function, the High frequency filter anti-jamming circuit can effectively suppress Conduction Interference, guarantees the stability of Switching Power Supply.Pass through the switching power supply circuit at last, obtain the required power supply of consumer each several part.
When each phase line and zero line generation misphase, the voltage major part that is increased is consumed by compound temperature-sensitive RT1, and the protection switch power supply does not damage because of overtension.
The content that this instructions is not described in detail belongs to this area professional and technical personnel's known prior art.
Claims (9)
1. three-phase and four-line low-power consumption Switching Power Supply electric energy table, it comprises switch power module, the electric energy metrical module, CPU (central processing unit), data outputting module, data input module and communication module, wherein, the output terminal of switch power module connects the electric energy metrical module respectively, communication module and CPU (central processing unit), described electric energy metrical module, communication module, data outputting module, data input module inserts CPU (central processing unit) respectively, it is characterized in that: described switch power module comprises rectification circuit, High frequency filter anti-jamming circuit and switching power supply circuit, wherein, the High frequency filter anti-jamming circuit connects the switching power supply circuit, between described rectification circuit and High frequency filter anti-jamming circuit, be provided with the mu balanced circuit of zero line decision circuitry and band circuit gating function, described rectification circuit connects the input end of zero line decision circuitry respectively and is with the input end of the mu balanced circuit of circuit gating function, the output terminal of the mu balanced circuit of the output terminal of described zero line decision circuitry and band circuit gating function all inserts the High frequency filter anti-jamming circuit, the mu balanced circuit of the control signal output ends connecting band circuit gating function of described zero line decision circuitry.
2. three-phase and four-line low-power consumption Switching Power Supply electric energy table according to claim 1, it is characterized in that: described CPU (central processing unit) also is connected with data memory module and relay control unit.
3. three-phase and four-line low-power consumption Switching Power Supply electric energy table according to claim 1, it is characterized in that: the mu balanced circuit of described band circuit gating function also is connected with the zero line testing circuit.
4. three-phase and four-line low-power consumption Switching Power Supply electric energy table according to claim 1, it is characterized in that: described rectification circuit also is connected with protective circuit of switch power source.
5. three-phase and four-line low-power consumption Switching Power Supply electric energy table according to claim 1, it is characterized in that: described zero line decision circuitry comprises diode D13, resistance R 12～R15, capacitor C 5, field effect transistor Q2, transient suppressor Z1, wherein, the grid of field effect transistor Q2 connects an end of resistance R 14, the other end of resistance R 14 inserts zero line JN1 by the resistance R 12～R13 and the diode D13 of series connection, connect capacitor C 5 between field effect transistor Q2 source class and the grid, the two ends of capacitor C 5 connect resistance R 15, field effect transistor Q2 source class also connects rectification circuit, connect transient suppressor Z1 between the source class of field effect transistor Q2 and the drain electrode, the mu balanced circuit of connecting band circuit gating function is gone back in the drain electrode of field effect transistor Q2.
6. three-phase and four-line low-power consumption Switching Power Supply electric energy table according to claim 1, it is characterized in that: the mu balanced circuit of described band circuit gating function comprises resistance R 4～R9, field effect transistor Q1, capacitor C 9, diode D17 and transient suppressor Z2, wherein, the drain electrode of field effect transistor Q1 connects rectification circuit by resistance R 4, connect resistance R 9 between the drain electrode of the grid of field effect transistor Q1 and field effect transistor Q2, resistance in series R5～R8 between the drain electrode of rectification circuit and field effect transistor Q2, connect transient suppressor Z2 between the source class of field effect transistor Q1 and the grid, capacitor C 9 connects the two ends of transient suppressor Z2, and the source class of field effect transistor Q1 also connects the High frequency filter anti-jamming circuit.
7. three-phase and four-line low-power consumption Switching Power Supply electric energy table according to claim 3, it is characterized in that: described zero line testing circuit comprises voltage stabilizing diode DZ1, resistance R 10～R11 and photoelectrical coupler OP1, wherein, the negative pole of voltage stabilizing diode DZ1 is connected in the source class of field effect transistor Q1, the positive pole of voltage stabilizing diode DZ1 connects the High frequency filter anti-jamming circuit, the input end of photoelectrical coupler OP1 is by the two ends of resistance R 10～R11 access voltage stabilizing diode DZ1, and the output terminal JI of photoelectrical coupler OP1 is used to connect single-chip microcomputer.
8. three-phase and four-line low-power consumption Switching Power Supply electric energy table according to claim 1, it is characterized in that: described rectification circuit comprises diode D1～D12, diode D14～D15, wherein, the negative pole of diode D1 connects the first phase line JA1, the negative pole of diode D4 connects the positive pole of D1, the negative pole of diode D2 connects the second phase line JB1, the negative pole of diode D6 connects the positive pole of D2, the negative pole of diode D3 connects third phase line JC1, the negative pole of diode D5 connects the positive pole of D3, the positive pole of the cathode connecting diode D6 of diode D4～D5; The negative pole of the anodal diode D1 of diode D7, the negative pole of the cathode connecting diode D7 of diode D10, the negative pole of the cathode connecting diode D2 of diode D8, the negative pole of the cathode connecting diode D8 of diode D11, the negative pole of the cathode connecting diode D3 of diode D9, the negative pole of the cathode connecting diode D9 of diode D12, the negative pole of diode D10～D12 connects the positive pole of diode D6, the negative pole of diode D14 links to each other with the positive pole of diode D15, the positive pole of diode D14 connects zero line JN1, and the negative pole of diode D15 connects the High frequency filter anti-jamming circuit.
9. three-phase and four-line low-power consumption Switching Power Supply electric energy table according to claim 4; it is characterized in that: described protective circuit of switch power source comprises wire-wound resistor R1～R3 and voltage dependent resistor (VDR) ZR1～ZR4; composite thermistor RT1; diode D16～D17; wherein; connecting line is around resistance R 1 between the negative pole of diode D1 and the first phase line JA1; connecting line is around resistance R 2 between the negative pole of diode D2 and the second phase line JB1; connecting line is around resistance R 3 between the negative pole of diode D3 and the third phase line JC1; connect voltage dependent resistor (VDR) ZR1 between the first phase line JA1 and the zero line JN1; connect voltage dependent resistor (VDR) ZR2 between the second phase line JB2 and the zero line JN1; connect voltage dependent resistor (VDR) ZR3 between third phase line JC1 and the zero line JN1; connect voltage dependent resistor (VDR) ZR4 between the negative pole of the positive pole of diode D5 and diode D12; connect composite thermistor RT1 between the negative pole of the positive pole of diode D16 and diode D15; the positive pole of diode D17 connects the zero line testing circuit, inserts the input end of High frequency filter anti-jamming circuit after the negative pole of diode D16 links to each other with the negative pole of diode D17.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010202769966U CN201811993U (en) | 2010-07-30 | 2010-07-30 | Three-phase four-line low-power energy meter with switching power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010202769966U CN201811993U (en) | 2010-07-30 | 2010-07-30 | Three-phase four-line low-power energy meter with switching power supply |
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| CN201811993U true CN201811993U (en) | 2011-04-27 |
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| CN2010202769966U Expired - Lifetime CN201811993U (en) | 2010-07-30 | 2010-07-30 | Three-phase four-line low-power energy meter with switching power supply |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102237809A (en) * | 2011-07-08 | 2011-11-09 | 江苏林洋电子股份有限公司 | Switching power circuit for three-phase intelligent electric energy meter |
| CN102338816A (en) * | 2011-06-17 | 2012-02-01 | 杭州炬华科技股份有限公司 | Resistance-capacitance power supply for tri-manganin electric energy meter |
| CN104297562A (en) * | 2014-10-23 | 2015-01-21 | 武汉盛帆电子股份有限公司 | Intelligent identification type electric energy meter |
| CN104950151A (en) * | 2015-07-10 | 2015-09-30 | 成都天兴电气有限公司 | Device for automatically switching three-wire and four-wire metering modes of three-phase electric energy meter |
| CN108092529A (en) * | 2017-12-27 | 2018-05-29 | 浙江恒业电子有限公司 | A kind of Three phase electrical energy meter electricity source circuit |
| CN109946559A (en) * | 2017-12-21 | 2019-06-28 | 成都长城开发科技有限公司 | Three-phase and four-line ammeter and its fall zero curve detection circuit |
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2010
- 2010-07-30 CN CN2010202769966U patent/CN201811993U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102338816A (en) * | 2011-06-17 | 2012-02-01 | 杭州炬华科技股份有限公司 | Resistance-capacitance power supply for tri-manganin electric energy meter |
| CN102338816B (en) * | 2011-06-17 | 2013-06-05 | 杭州炬华科技股份有限公司 | Resistance-capacitance power supply for tri-manganin electric energy meter |
| CN102237809A (en) * | 2011-07-08 | 2011-11-09 | 江苏林洋电子股份有限公司 | Switching power circuit for three-phase intelligent electric energy meter |
| CN102237809B (en) * | 2011-07-08 | 2015-11-18 | 江苏林洋电子股份有限公司 | A kind of switching power circuit for three-phase intelligent electric energy meter |
| CN104297562A (en) * | 2014-10-23 | 2015-01-21 | 武汉盛帆电子股份有限公司 | Intelligent identification type electric energy meter |
| CN104950151A (en) * | 2015-07-10 | 2015-09-30 | 成都天兴电气有限公司 | Device for automatically switching three-wire and four-wire metering modes of three-phase electric energy meter |
| CN109946559A (en) * | 2017-12-21 | 2019-06-28 | 成都长城开发科技有限公司 | Three-phase and four-line ammeter and its fall zero curve detection circuit |
| CN108092529A (en) * | 2017-12-27 | 2018-05-29 | 浙江恒业电子有限公司 | A kind of Three phase electrical energy meter electricity source circuit |
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Granted publication date: 20110427 |