CN202002975U - Three-phase low power consumption cost-control intelligent watt-hour meter based on zero line judging switching power supply - Google Patents
Three-phase low power consumption cost-control intelligent watt-hour meter based on zero line judging switching power supply Download PDFInfo
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- CN202002975U CN202002975U CN2011200233713U CN201120023371U CN202002975U CN 202002975 U CN202002975 U CN 202002975U CN 2011200233713 U CN2011200233713 U CN 2011200233713U CN 201120023371 U CN201120023371 U CN 201120023371U CN 202002975 U CN202002975 U CN 202002975U
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Abstract
The utility model relates to the technical field of three-phase watt-hour meters, and provides a three-phase low power consumption cost-control intelligent watt-hour meter based on a zero line judging switching power supply. The three-phase low power consumption cost-control intelligent watt-hour meter comprises a switching power supply module, wherein, the switching power supply module comprises a rectifying circuit, a zero line detecting circuit, a voltage stabilizing circuit with a line gating function, a zero line judging circuit, a high-frequency filtering anti-interference circuit, and a switching and voltage stabilizing power supply circuit. The three-phase low power consumption cost-control intelligent watt-hour meter has high interference suppression ability while the switching power supply is used to supply power, and can still work normally under the circumstance that a zero line is lacked or phases are dislocated.
Description
Technical field
The utility model relates to a kind of three-phase electric energy meter technical field, particularly a kind of three-phase low-power consumption expense control intelligent electric energy meter of judging Switching Power Supply based on zero line.
Background technology
Existing three-phase expense control intelligent 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, and cost is higher.Along with reaching its maturity of switch power technology, the technological development personnel begin to attempt to use that volume is little, in light weight, efficient is high in three-phase expense control intelligent electric energy meter, the Switching Power Supply scheme power supply of self strong interference immunity solves the problem that exists in the transformer-supplied scheme.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 or misphase in the general threephase switch power supply electric energy meter, electric energy meter is with cisco unity malfunction, so the scheme that Switching Power Supply is powered to three-phase expense control intelligent electric energy meter also needs constantly perfect.
Summary of the invention
The purpose of this utility model is exactly in order to overcome above-mentioned the deficiencies in the prior art part, and provide a kind of three-phase low-power consumption expense to control intelligent electric energy meter based on zero line judgement Switching Power Supply, it is when using the Switching Power Supply power supply, and the interference rejection capability of ammeter is strong and still can operate as normal under the situation that lacks zero line or misphase.
The purpose of this utility model realizes by following technical measures: judge Switching Power Supply three-phase low-power consumption expense control intelligent electric energy meter based on zero line, comprise switch power module, single-chip microcomputer CPU (central processing unit), communication module and intelligent electric energy meter basic function module, described switch power module comprises mu balanced circuit, zero line decision circuitry, High frequency filter anti-jamming circuit and the switching power supply circuit of rectification circuit, zero line testing circuit, band circuit gating function; The output terminal of described rectification circuit links with the input end of high frequency anti-interference filtration circuit and the input end of the mu balanced circuit of band circuit gating function respectively, the output terminal of described zero line decision circuitry links to each other with the input end of the mu balanced circuit of band circuit gating function, the output terminal of the mu balanced circuit of described band circuit gating function and the input end of zero line testing circuit link, the input end of the output terminal of described zero line testing circuit and High frequency filter anti-jamming circuit links, and the input end of the output terminal of High frequency filter anti-jamming circuit and switching power supply circuit links.
In technique scheme, be connected with protective circuit of switch power source in the described switch power module.
In technique scheme, described protective circuit of switch power source comprises wire-wound resistor R1, wire-wound resistor R2, wire-wound resistor R3, voltage dependent resistor (VDR) ZR1, voltage dependent resistor (VDR) ZR2, voltage dependent resistor (VDR) ZR3, voltage dependent resistor (VDR) ZR4, composite thermistor RT1, diode D16 and diode D17; Described resistance R 1 is connected between the negative pole and the first phase line JA1 of diode D1 in the described rectification circuit, resistance R 2 is connected between the negative pole and the second phase line JB1 of diode D2 in the described rectification circuit, resistance R 3 is connected between the negative pole and third phase line JC1 of diode D3 in the described rectification circuit, voltage dependent resistor (VDR) ZR1 is connected between the first phase line JA1 and the zero line JN1, voltage dependent resistor (VDR) ZR2 is connected between the second phase line JB2 and the zero line JN1, voltage dependent resistor (VDR) ZR3 is connected between third phase line JC1 and the zero line JN1, voltage dependent resistor (VDR) ZR4 is connected between the positive pole and diode D12 of diode D5 in the described rectification circuit, composite thermistor RT1 is connected between the negative pole of diode D15 in the anodal and described rectification circuit of D16, and the negative pole of the negative pole of diode D16 and diode D17 links and inserts the input end of High frequency filter anti-jamming circuit.
In technique scheme, described rectification circuit comprises diode D1 ~ diode D12, diode D14 and diode D15; The negative pole of described diode D1 connects an end of resistance R 1 in the described protective circuit of switch power source; the negative pole of diode D4 connects the positive pole of diode D1; the negative pole of diode D2 connects an end of resistance R 2 in the described protective circuit of switch power source; the negative pole of diode D6 connects the positive pole of diode D2; the negative pole of diode D3 connects an end of resistance R 3 in the described protective circuit of switch power source; the negative pole of diode D5 connects the positive pole of diode D3; diode D4; the positive pole of the cathode connecting diode D6 of diode D5; the negative pole of the cathode connecting 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; diode D10; diode D11; the negative pole of diode D10 voltage dependent resistor (VDR) ZR4 in described protective circuit of switch power source is connected to the positive pole of diode D6; the positive pole of diode D14 connects zero line JN1, and the negative pole of diode D14 links to each other with the positive pole of diode D15.
In technique scheme, described zero line testing circuit comprises voltage stabilizing diode DZ1, resistance R 10, resistance R 11 and photoelectrical coupler OP1; The negative pole of described voltage stabilizing diode DZ1 is connected to the source class of field effect transistor Q1 in the mu balanced circuit of described band circuit gating function; diode D17 and the High frequency filter anti-jamming circuit of the positive pole of voltage stabilizing diode DZ1 in protective circuit of switch power source links; resistance R 11 is connected in parallel on the input end of photoelectrical coupler OP1; the input end of photoelectrical coupler OP1 is by the two ends of resistance R 10, resistance R 11 access voltage stabilizing diode DZ1, and the output signal of the output terminal JI of photoelectrical coupler OP1 is connected to the single-chip microcomputer CPU (central processing unit).
In technique scheme, the mu balanced circuit of described band circuit gating function comprises resistance R 4 ~ resistance R 9, field effect transistor Q1, capacitor C 9 and transient suppressor Z2; The grid of described field effect transistor Q1 is connected to described rectification circuit via the resistance R 5 ~ resistance R 9 of series connection, the drain electrode of field effect transistor Q1 is connected to described rectification circuit via resistance R 4, connect transient suppressor Z2 between the source class of field effect transistor Q1 and the grid, capacitor C 9 is connected in parallel on the two ends of transient suppressor Z2, and the negative pole of the source class of field effect transistor Q1 and voltage stabilizing diode DZ1 links.
In technique scheme, described zero line decision circuitry comprises diode D13, resistance R 12 ~ resistance R 15, capacitor C 5, field effect transistor Q2, transient suppressor Z1; The grid of described field effect transistor Q2 is connected to zero line JN1 via resistance R 14, resistance R 13, resistance R 12, the diode D13 of series connection, connect capacitor C 5 between field effect transistor Q2 source class and the grid, resistance R 15 is connected in parallel on the two ends of capacitor C 5, connect transient suppressor Z1 between the source class of field effect transistor Q2 and the drain electrode, field effect transistor Q2 source class connects rectification circuit, the mu balanced circuit of the drain electrode connecting band circuit gating function of field effect transistor Q2.
In technique scheme, described field effect transistor Q1 and the preferred metal-oxide-semiconductor field effect transistor of field effect transistor Q2.
The utility model makes its power consumption reduce by 60%～70% than common three-phase electric energy meter by in three-phase expense control intelligent electric energy meter switch power module being set, and has saved the energy greatly, meets the energy-saving and cost-reducing development trend of electric energy meter; And by the mu balanced circuit of zero line decision circuitry and band circuit gating function is set in switch power module; make that three-phase expense control intelligent electric energy meter also can operate as normal in the situation that lacks zero line; simultaneously; because the effect protection switch power supply of composite thermistor is not damaged in misphase, practicality and the reliability of judging Switching Power Supply three-phase low-power consumption expense control intelligent electric energy meter based on zero line have been strengthened.The utility model also has advantages such as the Conduction Interference of inhibition ability is strong, reliability is high, power-efficient is high, low in energy consumption.
Description of drawings
Fig. 1 is the utility model is judged the three-phase low-power consumption expense control intelligent electric energy meter of Switching Power Supply based on zero line a circuit block diagram.
Fig. 2 is the circuit theory diagrams of switch power module among the utility model embodiment.
Fig. 3 is the circuit connection diagram of switch power module among the utility model embodiment.
Embodiment
The utility model will be further described below in conjunction with drawings and Examples.
As shown in Figure 1, the utility model comprises switch power module, single-chip microcomputer CPU (central processing unit), communication module and intelligent electric energy meter basic function module based on the three-phase low-power consumption expense control intelligent electric energy meter of zero line judgement Switching Power Supply.Switch power module is respectively single-chip microcomputer CPU (central processing unit), communication module and the power supply of intelligent electric energy meter basic function module, and single-chip microcomputer CPU (central processing unit) and communication module and intelligent electric energy meter basic function module link.
As shown in Figure 2, described switch power module comprises mu balanced circuit, zero line decision circuitry, High frequency filter anti-jamming circuit and the switching power supply circuit of rectification circuit, zero line testing circuit, band circuit gating function; The output terminal of described rectification circuit links with the input end of high frequency anti-interference filtration circuit and the input end of the mu balanced circuit of band circuit gating function respectively, the output terminal of described zero line decision circuitry links to each other with the input end of the mu balanced circuit of band circuit gating function, the output terminal of the mu balanced circuit of described band circuit gating function and the input end of zero line testing circuit link, the input end of the output terminal of described zero line testing circuit and High frequency filter anti-jamming circuit links, and the input end of the output terminal of High frequency filter anti-jamming circuit and switching power supply circuit links.Described 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.The zero line decision circuitry 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.
Also be connected with protective circuit of switch power source in the above-mentioned switch power module and be used for preventing impacts such as lightning surge.
The circuit connecting relation of switch power module is described in detail in detail below:
Above-mentioned protective circuit of switch power source comprises wire-wound resistor R1, wire-wound resistor R2, wire-wound resistor R3, voltage dependent resistor (VDR) ZR1, voltage dependent resistor (VDR) ZR2, voltage dependent resistor (VDR) ZR3, voltage dependent resistor (VDR) ZR4, composite thermistor RT1, diode D16 and diode D17.Wherein, resistance R 1 is connected between the negative pole and the first phase line JA1 of diode D1 in the described rectification circuit, resistance R 2 is connected between the negative pole and the second phase line JB1 of diode D2 in the described rectification circuit, resistance R 3 is connected between the negative pole and third phase line JC1 of diode D3 in the described rectification circuit, voltage dependent resistor (VDR) ZR1 is connected between the first phase line JA1 and the zero line JN1, voltage dependent resistor (VDR) ZR2 is connected between the second phase line JB2 and the zero line JN1, voltage dependent resistor (VDR) ZR3 is connected between third phase line JC1 and the zero line JN1, voltage dependent resistor (VDR) ZR4 is connected between the positive pole and diode D12 of diode D5 in the described rectification circuit, composite thermistor RT1 is connected between the negative pole of diode D15 in the anodal and described rectification circuit of D16, 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 and diode D17 can prevent voltage reversal preceding utmost point element is caused damage.
Above-mentioned rectification circuit comprises diode D1 ~ diode D12, diode D14 and diode D15.Wherein, the negative pole of diode D1 connects an end of resistance R 1 in the described protective circuit of switch power source, the negative pole of diode D4 connects the positive pole of diode D1, the negative pole of diode D2 connects an end of resistance R 2 in the described protective circuit of switch power source, the negative pole of diode D6 connects the positive pole of diode D2, the negative pole of diode D3 connects an end of resistance R 3 in the described protective circuit of switch power source, the negative pole of diode D5 connects the positive pole of diode D3, the positive pole of the cathode connecting diode D6 of diode D4, diode D5; The negative pole of the cathode connecting 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; diode D10; diode D11; the negative pole of diode D10 voltage dependent resistor (VDR) ZR4 in described protective circuit of switch power source is connected to the positive pole of diode D6; the positive pole of diode D14 connects zero line JN1; the negative pole of diode D14 links to each other with the positive pole of diode D15, and the negative pole of diode D15 connects the High frequency filter anti-jamming circuit.When zero line was arranged, diode D14 ~ diode D15 and diode D1 ~ diode D6 formed the half-bridge rectification circuit; When lacking zero line, diode D1 ~ diode D12 forms full bridge rectifier.
Above-mentioned zero line testing circuit comprises voltage stabilizing diode DZ1, resistance R 10, resistance R 11 and photoelectrical coupler OP1.Wherein, the negative pole of described voltage stabilizing diode DZ1 is connected to the source class of field effect transistor Q1 in the mu balanced circuit of described band circuit gating function; diode D17 and the High frequency filter anti-jamming circuit of the positive pole of voltage stabilizing diode DZ1 in protective circuit of switch power source links; resistance R 11 is connected in parallel on the input end of photoelectrical coupler OP1; the input end of photoelectrical coupler OP1 is by the two ends of resistance R 10, resistance R 11 access voltage stabilizing diode DZ1, and the output signal of the output terminal JI of photoelectrical coupler OP1 is connected to the single-chip microcomputer CPU (central processing unit).
The mu balanced circuit of above-mentioned band circuit gating function comprises resistance R 4 ~ resistance R 9, field effect transistor Q1, capacitor C 9 and transient suppressor Z2.Wherein, the drain electrode of field effect transistor Q2 is connected to described rectification circuit via the resistance R 5 ~ resistance R 9 of series connection, the drain electrode of field effect transistor Q1 is connected to described rectification circuit via resistance R 4, connect transient suppressor Z2 between the source class of field effect transistor Q1 and the grid, capacitor C 9 is connected in parallel on the two ends of transient suppressor Z2, and the negative pole of the source class of field effect transistor Q1 and voltage stabilizing diode DZ1 links.
Above-mentioned zero line decision circuitry comprises diode D13, resistance R 12 ~ resistance R 15, capacitor C 5, field effect transistor Q2, transient suppressor Z1.Wherein, the grid of field effect transistor Q2 is connected to zero line JN1 via resistance R 14, resistance R 13, resistance R 12, diode D13, connect capacitor C 5 between field effect transistor Q2 source class and the grid, resistance R 15 is connected in parallel on the two ends of capacitor C 5, connect transient suppressor Z1 between the source class of field effect transistor Q2 and the drain electrode, field effect transistor Q2 source class connects rectification circuit, the mu balanced circuit of the drain electrode connecting band circuit gating function 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.
Above-mentioned field effect transistor Q1 and the preferred metal-oxide-semiconductor field effect transistor of field effect transistor Q2.
The scarce zero line judgment task principle of present embodiment switch power module 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 JN1 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 mu balanced 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 field effect transistor Q1 output voltage can be not too high and damage back utmost point element with voltage clamp, and at this moment field effect transistor Q1 is operated in linear condition, the voltage that surpasses fixed value mainly is added on the field effect transistor Q1, field effect transistor 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.
Claims (7)
1. judge Switching Power Supply three-phase low-power consumption expense control intelligent electric energy meter based on zero line, comprise switch power module, single-chip microcomputer CPU (central processing unit), communication module and intelligent electric energy meter basic function module, it is characterized in that: described switch power module comprises mu balanced circuit, zero line decision circuitry, High frequency filter anti-jamming circuit and the switching power supply circuit of rectification circuit, zero line testing circuit, band circuit gating function; The output terminal of described rectification circuit links with the input end of high frequency anti-interference filtration circuit and the input end of the mu balanced circuit of band circuit gating function respectively, the output terminal of described zero line decision circuitry links to each other with the input end of the mu balanced circuit of band circuit gating function, the output terminal of the mu balanced circuit of described band circuit gating function and the input end of zero line testing circuit link, the input end of the output terminal of described zero line testing circuit and High frequency filter anti-jamming circuit links, and the input end of the output terminal of High frequency filter anti-jamming circuit and switching power supply circuit links.
2. according to claim 1 based on zero line judgement Switching Power Supply three-phase low-power consumption expense control intelligent electric energy meter, it is characterized in that: be connected with protective circuit of switch power source in the described switch power module.
3. according to claim 2 based on zero line judgement Switching Power Supply three-phase low-power consumption expense control intelligent electric energy meter, it is characterized in that: described protective circuit of switch power source comprises wire-wound resistor R1, wire-wound resistor R2, wire-wound resistor R3, voltage dependent resistor (VDR) ZR1, voltage dependent resistor (VDR) ZR2, voltage dependent resistor (VDR) ZR3, voltage dependent resistor (VDR) ZR4, composite thermistor RT1, diode D16 and diode D17; Described resistance R 1 is connected between the negative pole and the first phase line JA1 of diode D1 in the described rectification circuit, resistance R 2 is connected between the negative pole and the second phase line JB1 of diode D2 in the described rectification circuit, resistance R 3 is connected between the negative pole and third phase line JC1 of diode D3 in the described rectification circuit, voltage dependent resistor (VDR) ZR1 is connected between the first phase line JA1 and the zero line JN1, voltage dependent resistor (VDR) ZR2 is connected between the second phase line JB2 and the zero line JN1, voltage dependent resistor (VDR) ZR3 is connected between third phase line JC1 and the zero line JN1, voltage dependent resistor (VDR) ZR4 is connected between the positive pole and diode D12 of diode D5 in the described rectification circuit, composite thermistor RT1 is connected between the negative pole of diode D15 in the anodal and described rectification circuit of D16, and the negative pole of the negative pole of diode D16 and diode D17 links and inserts the input end of High frequency filter anti-jamming circuit.
4. according to claim 2 based on zero line judgement Switching Power Supply three-phase low-power consumption expense control intelligent electric energy meter, it is characterized in that: described rectification circuit comprises diode D1 ~ diode D12, diode D14 and diode D15; The negative pole of described diode D1 connects an end of resistance R 1 in the described protective circuit of switch power source; the negative pole of diode D4 connects the positive pole of diode D1; the negative pole of diode D2 connects an end of resistance R 2 in the described protective circuit of switch power source; the negative pole of diode D6 connects the positive pole of diode D2; the negative pole of diode D3 connects an end of resistance R 3 in the described protective circuit of switch power source; the negative pole of diode D5 connects the positive pole of diode D3; diode D4; the positive pole of the cathode connecting diode D6 of diode D5; the negative pole of the cathode connecting 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; diode D10; diode D11; the negative pole of diode D10 voltage dependent resistor (VDR) ZR4 in described protective circuit of switch power source is connected to the positive pole of diode D6; the positive pole of diode D14 connects zero line JN1, and the negative pole of diode D14 links to each other with the positive pole of diode D15.
5. according to claim 2 based on zero line judgement Switching Power Supply three-phase low-power consumption expense control intelligent electric energy meter, it is characterized in that: described zero line testing circuit comprises voltage stabilizing diode DZ1, resistance R 10, resistance R 11 and photoelectrical coupler OP1; The negative pole of described voltage stabilizing diode DZ1 is connected to the source class of field effect transistor Q1 in the mu balanced circuit of described band circuit gating function; diode D17 and the High frequency filter anti-jamming circuit of the positive pole of voltage stabilizing diode DZ1 in protective circuit of switch power source links; resistance R 11 is connected in parallel on the input end of photoelectrical coupler OP1; the input end of photoelectrical coupler OP1 is by the two ends of resistance R 10, resistance R 11 access voltage stabilizing diode DZ1, and the output signal of the output terminal JI of photoelectrical coupler OP1 is connected to the single-chip microcomputer CPU (central processing unit).
6. according to claim 2 based on zero line judgement Switching Power Supply three-phase low-power consumption expense control intelligent electric energy meter, it is characterized in that: the mu balanced circuit of described band circuit gating function comprises resistance R 4 ~ resistance R 9, field effect transistor Q1, capacitor C 9 and transient suppressor Z2; The grid of described field effect transistor Q1 is connected to described rectification circuit via the resistance R 5 ~ resistance R 9 of series connection, the drain electrode of field effect transistor Q1 is connected to described rectification circuit via resistance R 4, connect transient suppressor Z2 between the source class of field effect transistor Q1 and the grid, capacitor C 9 is connected in parallel on the two ends of transient suppressor Z2, and the negative pole of the source class of field effect transistor Q1 and voltage stabilizing diode DZ1 links.
7. according to claim 2 based on zero line judgement Switching Power Supply three-phase low-power consumption expense control intelligent electric energy meter, it is characterized in that: described zero line decision circuitry comprises diode D13, resistance R 12 ~ resistance R 15, capacitor C 5, field effect transistor Q2, transient suppressor Z1; The grid of described field effect transistor Q2 is connected to zero line JN1 via resistance R 14, resistance R 13, resistance R 12, the diode D13 of series connection, connect capacitor C 5 between field effect transistor Q2 source class and the grid, resistance R 15 is connected in parallel on the two ends of capacitor C 5, connect transient suppressor Z1 between the source class of field effect transistor Q2 and the drain electrode, field effect transistor Q2 source class connects rectification circuit, the mu balanced circuit of the drain electrode connecting band circuit gating function of field effect transistor Q2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200233713U CN202002975U (en) | 2011-01-25 | 2011-01-25 | Three-phase low power consumption cost-control intelligent watt-hour meter based on zero line judging switching power supply |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011200233713U CN202002975U (en) | 2011-01-25 | 2011-01-25 | Three-phase low power consumption cost-control intelligent watt-hour meter based on zero line judging switching power supply |
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| CN202002975U true CN202002975U (en) | 2011-10-05 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102175914A (en) * | 2011-01-25 | 2011-09-07 | 武汉盛帆电子股份有限公司 | Three-phase low power consumption control intelligent electric energy meter based on zero line judging switching power supply |
| 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 |
-
2011
- 2011-01-25 CN CN2011200233713U patent/CN202002975U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102175914A (en) * | 2011-01-25 | 2011-09-07 | 武汉盛帆电子股份有限公司 | Three-phase low power consumption control intelligent electric energy meter based on zero line judging switching power supply |
| 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 |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Li Zhongze Inventor after: Shen Yi Inventor before: Li Zhongze |
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| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: LI ZHONGZE TO: LI ZHONGZE SHEN YI |
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| CX01 | Expiry of patent term |
Granted publication date: 20111005 |
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| CX01 | Expiry of patent term |