CN202160098U - Switch power supply circuit for three-phase intelligent electric energy meter - Google Patents
Switch power supply circuit for three-phase intelligent electric energy meter Download PDFInfo
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- CN202160098U CN202160098U CN 201120239793 CN201120239793U CN202160098U CN 202160098 U CN202160098 U CN 202160098U CN 201120239793 CN201120239793 CN 201120239793 CN 201120239793 U CN201120239793 U CN 201120239793U CN 202160098 U CN202160098 U CN 202160098U
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Abstract
The utility model discloses a switch power supply circuit for a three-phase intelligent electric energy meter, which comprises a distribution load control device (1), a half-wave rectification and filter device (2), a zero line, overvoltage and electromagnetic disturbance monitoring and protecting device (4) and a load control device (5). A three-phase four-wire power supply (6) supplies power to the distribution load control device (1) which is connected with one end of the half-wave rectification and filter device (2), and the other end of the half-wave rectification and filter device (2) is output to a direct current (DC)/DC converter (3). The DC/DC converter (3) is connected with an electric energy function circuit (7), one end of the zero line, overvoltage and electromagnetic disturbance monitoring and protecting device (4) is connected with the half-wave rectification and filter device (2) and the DC/DC converter (3), the other end of the zero line, overvoltage and electromagnetic disturbance monitoring and protecting device (4) is connected with one end of the load control device (5), and the other end of the load control device (5) is connected with the distribution load control device (1). The switch power supply circuit for the three-phase intelligent electric energy meter has the advantages of being low in cost and high in reliability, and having effective restraining capacity on strong electromagnetic disturbance and extreme harmonic current disturbance.
Description
Technical field
The utility model relates to a kind of three-phase intelligent electric energy meter and uses switching power circuit, belongs to the electronic electric energy meter technical field.
Background technology
It is that basic line rectification power supply comes to the table in-line power that the most electric energy meters of present China all adopt Industrial Frequency Transformer, and this power-efficient is very low, has only 30% to 40% usually.Along with the intelligent innovation of electric energy meter; The power consumption of electric energy meter also increases considerably; For example the power consumption of three-phase table increases to several watts for one watt from original less than, and this is for the hundreds of millions of intelligent electric energy meter that is about to promote, and the increase of the overall power consumption of electric energy meter will be very surprising; On the other hand, the conversion of control energy fast and efficiently of switch power technology utilization power semiconductor, electric energy conversion efficient can possess very strong energy-saving and cost-reducing advantage up to more than 70%, so it is the desirable upgrading products of electrical power apparent source.But this technology will obtain large tracts of land to be promoted, and also need solve following several difficult:
(1), long-term reliability: intelligent electric energy meter needs continual reliability service of 24 hours every days, annual 365 days, 10 years, accurately metering and real time communication.Therefore it is high to the reliability requirement of power supply, considerably beyond to the general product for civilian use such as the reliability requirement of computer.
(2), extremely strong anti-electromagnetic interference capability: switching of electrical network high-voltage load switch or round thunder and lightning can cause strong electromagnetic interference when attacking.The Switching Power Supply that with the semiconductor device is core must effectively be resisted this type of interference capability, to guarantee the long-term accurately metering of intelligent electric energy meter.China is vast in territory, and transmission of electricity, power utilization environment are very complicated, and this problem becomes and has more challenge.
(3), anti-Harmonic Interference ability: China's electric railway and heavy industry equipment often discharge a large amount of Harmonic Interference electric currents to electrical network, can cause local power voltage seriously to distort.Electric energy meter electric source must effectively suppress this type of interference, keep accurate measurement.
(4), cost has competitiveness: the cost of Switching Power Supply must not be higher than the cost of existing linear power supply.
Chinese patent CN201811993 " three-phase and four-line low-power consumption Switching Power Supply electric energy table ", Chinese patent CN1410856A " device and its control method with electronic circuit of harmonic wave inhibition and voltage stabilizing function " and Chinese patent CN101533082A patents such as " a kind of electric energy meter halfwave rectifier circuits " and document have proposed multiple solution from different perspectives partly; But these solutions can't intactly address the above problem, and this also is the main cause that Switching Power Supply obtains promoting in China's electric energy meter industry so far not yet.Therefore, need provide a kind of new technical scheme to solve above-mentioned technical problem.
Summary of the invention
The purpose of the utility model provides a kind of low cost, high-reliability, disturbs the three-phase intelligent electric energy meter with effective inhibition ability to use switching power circuit to strong electromagnetic and extreme harmonic current.
The technical scheme that the utility model adopts is:
A kind of three-phase intelligent electric energy meter is used switching power circuit; It comprises distributed weight adjustment device, the halfwave rectifier filter of holding concurrently, zero line, overvoltage and electromagnetic interference monitoring and protective device; And load control unit; Said distributed weight adjustment device is supplied power by three-phase four-wire power, and said distributed weight adjustment device and halfwave rectifier filter one end of holding concurrently is connected, and the said halfwave rectifier filter other end of holding concurrently exports the DC/DC converter to; Said DC/DC converter is connected with the electric energy meter functional circuit; Said zero line, overvoltage and electromagnetic interference monitoring and protective device one end and the halfwave rectifier filter of holding concurrently is connected with the DC/DC converter, and said zero line, overvoltage and electromagnetic interference are monitored and the protective device other end is connected with load control unit one end, and the said load control unit other end is connected with distributed weight adjustment device.
Said distributed weight adjustment device comprises power resistor R0, R1, R2 and R3, and said power resistor R0 connects the input side zero-power line, and said power resistor R1, R2 and R3 are connected input side power supply one phase voltage respectively.
Said halfwave rectifier is held concurrently filter by high-voltage diode D1, D2, D3; Inductance L 1 is formed with high-pressure electrolysis capacitor C 1; The negative electrode of said high-voltage diode D1, D2, D3 links to each other with inductance L 1 one ends; Said inductance L 1 other end links to each other with DC/DC converter input with high-pressure electrolysis capacitor C 1 positive pole, and the negative pole of said high-pressure electrolysis capacitor C 1 links to each other with resistance R 0.
Said zero line, overvoltage and electromagnetic interference monitoring and protective device are made up of sample circuit and control circuit; Said sample circuit is managed Z1, resistance R 7, diode D9 and resistance R 6 by TVS and is formed; Said control circuit is managed Z2, resistance R 5, diode D7, diode D8 and P channel-style MOSFET M1 by TVS and is formed; The negative electrode of said TVS pipe Z1 connects the positive pole of high-pressure electrolysis capacitor C 1; The anode of said TVS pipe Z1 connects resistance R 7 one ends; Said resistance R 7 other ends are connected to the anode of diode D9, and the negative electrode of said diode D9 links to each other with the negative electrode of diode D8, the negative electrode of diode D7, the negative electrode of TVS pipe Z2 and the source electrode of P channel-style MOSFET M1, said resistance R 6 one sides and 1 anodal linking to each other of high-pressure electrolysis capacitor C; Said resistance R 6 opposite sides link to each other with resistance R 5 one sides with the anode of TVS pipe Z2, the grid of P channel-style MOSFET M1, and the drain electrode of said P channel-style MOSFET M1 links to each other with diode D7 anode, resistance R 5 opposite sides, inductance L 2 and capacitor C 2 one sides.
Said load control unit is by high-voltage diode D4, D5 and D6; Power resistor R4; Inductance L 2 and capacitor C 2 are formed; The anode of said high-voltage diode D4, D5 and D6 links to each other with resistance R 4 one sides, and said resistance R 4 opposite sides link to each other with inductance L 2 one sides, and said inductance L 2 opposite sides link to each other with resistance R 5 one sides with capacitor C 2.
The other end of power resistor R1, R2 and R3 in the said distributed weight adjustment device is connected with the hold concurrently anode of filter input side high-voltage diode D1, D2, D3 of halfwave rectifier respectively, and the negative electrode of load control unit outlet side high-voltage diode D4, D5, D6 connects.
The beneficial effect of the utility model is: through real-time monitoring and the adjusting to half-wave rectifying and wave-filtering output dc voltage, DC/DC converter voltage and neutral line current; In time dynamically to importing the distributed consumption of peak voltage; Make this power circuit can resist zero line disconnection, the suffered overvoltage of power supply input side or strong electromagnetic such as pulse, harmonic current effectively; Reliable because the realization of this programme is succinct, thereby it has very strong cost advantage and practical value.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the utility model is described in further detail.
Fig. 1 is the structured flowchart of the utility model.
Fig. 2 is the circuit theory diagrams of the utility model.
Wherein: 1, distributed weight adjustment device, 2, the halfwave rectifier filter of holding concurrently, 3, the DC/DC converter; 4, zero line, overvoltage and electromagnetic interference monitoring and protective device; 5, load control unit, 6, three-phase four-wire power, 7, the electric energy meter functional circuit; 8, sample circuit, 9, control circuit.
Embodiment
As illustrated in fig. 1 and 2; A kind of three-phase intelligent electric energy meter of the utility model is used switching power circuit, and it comprises distributed weight adjustment device 1, the halfwave rectifier filter 2 of holding concurrently; Zero line, overvoltage and electromagnetic interference monitoring and protective device 4; And load control unit 5, distributed weight adjustment device 1 is by three-phase four-wire power 6 power supply, and distributed weight adjustment device 1 and halfwave rectifier filter 2 one ends of holding concurrently are connected; Halfwave rectifier filter 2 other ends of holding concurrently export DC/DC converter 3 to; DC/DC converter 3 is connected with electric energy meter functional circuit 7, and zero line, overvoltage and electromagnetic interference monitoring and protective device 4 one ends and the halfwave rectifier filter 2 of holding concurrently is connected with DC/DC converter 3, and zero line, overvoltage and electromagnetic interference are monitored and protective device 4 other ends are connected with load control unit 5 one ends; Load control unit 5 other ends are connected with distributed weight adjustment device 1; Zero line, overvoltage and electromagnetic interference monitoring and protective device 4 obtain monitor signal from hold concurrently filter 2 and DC/DC converter 3 of halfwave rectifier, and export monitor signal to load control unit 5, and then distributed weight adjustment device 1 is controlled.
Distributed weight adjustment device 1 comprises power resistor R0, R1, R2 and R3, and power resistor R0 connects the input side zero-power line, and power resistor R1, R2 and R3 are connected input side power supply one phase voltage respectively; Halfwave rectifier is held concurrently filter 2 by high-voltage diode D1, D2, D3; Inductance L 1 is formed with high-pressure electrolysis capacitor C 1; The negative electrode of high-voltage diode D1, D2, D3 links to each other with inductance L 1 one ends; Inductance L 1 other end links to each other with DC/DC converter input with high-pressure electrolysis capacitor C 1 positive pole, and the negative pole of high-pressure electrolysis capacitor C 1 links to each other with resistance R 0; Zero line, overvoltage and electromagnetic interference monitoring and protective device 4 are made up of sample circuit 8 and control circuit 9; Sample circuit 8 is made up of TVS pipe Z1, resistance R 7, diode D9 and resistance R 6; Control circuit 9 is made up of TVS pipe Z2, resistance R 5, diode D7, diode D8 and P channel-style MOSFET M1; The negative electrode of TVS pipe Z1 connects the positive pole of high-pressure electrolysis capacitor C 1; The anode of TVS pipe Z1 connects resistance R 7 one ends; Resistance R 7 other ends are connected to the anode of diode D9, and the negative electrode of diode D9 links to each other with the negative electrode of diode D8, the negative electrode of diode D7, the negative electrode of TVS pipe Z2 and the source electrode of P channel-style MOSFET M1, resistance R 6 one sides and 1 anodal linking to each other of high-pressure electrolysis capacitor C; Resistance R 6 opposite sides link to each other with resistance R 5 one sides with the anode of TVS pipe Z2, the grid of P channel-style MOSFET M1, and the drain electrode of P channel-style MOSFET M1 links to each other with diode D7 anode, resistance R 5 opposite sides, inductance L 2 and capacitor C 2 one sides; Load control unit 5 is by high-voltage diode D4, D5 and D6; Power resistor R4, inductance L 2 and capacitor C 2 are formed, and the anode of high-voltage diode D4, D5 and D6 links to each other with resistance R 4 one sides; Resistance R 4 opposite sides link to each other with inductance L 2 one sides, and inductance L 2 opposite sides link to each other with resistance R 5 one sides with capacitor C 2; The other end of power resistor R1, R2 and R3 in the distributed weight adjustment device 1 is connected with the hold concurrently anode of filter 2 input side high-voltage diode D1, D2, D3 of halfwave rectifier respectively, and the negative electrode of load control unit 5 outlet side high-voltage diode D4, D5, D6 connects.
When three-phase four-wire power 6 input voltages just often, the halfwave rectifier filter 2 of holding concurrently carries out halfwave rectifier and LPF with the power supply input ac voltage; Compare with full-wave rectification scheme commonly used; The direct-current working volts amplitude that this scheme exports DC/DC converter 3 to is halved; Make the maximum operating range of the used high-voltage semi-conductor device in the DC/DC converter 3 reduce by half, thereby design cost is minimized, product reliability is enhanced.When power supply input side zero line broke off, common half-wave rectifying circuit can't operate as normal.The utility model scheme adopts the zero line monitoring device in time to open the standby current passage, thereby it is normal to guarantee to export to DC/DC conversion 3 device voltages.When receiving strong electromagnetic such as overvoltage or pulse, harmonic current when the power supply input side; Zero line, overvoltage and electromagnetic interference monitoring and protective device 4 can dynamically carry out dividing potential drop to the rectifier power source output dc voltage to be regulated; And in time consume through 1 pair of excess energy of distributed weight adjustment device; Thereby avoided continuing to add up and causing on the DC/DC converter 3 suffered voltage to raise gradually damaging of peak voltage that rectification outlet side direct voltage forms because of electromagnetic interference such as input side pulse, harmonic waves; This has also been avoided in DC/DC converter 3, using expensive control and high-voltage semi-conductor device, and has strengthened the reliability of circuit greatly; Another characteristics of the utility model scheme are that the realization of above-mentioned functions is based on succinct Power Electronic Circuit, thereby it has very strong cost advantage and practical value.
Claims (6)
1. a three-phase intelligent electric energy meter is used switching power circuit; It is characterized in that: it comprises distributed weight adjustment device (1); The halfwave rectifier filter (2) of holding concurrently, zero line, overvoltage and electromagnetic interference monitoring and protective device (4), and load control unit (5); Said distributed weight adjustment device (1) is supplied power by three-phase four-wire power (6); Said distributed weight adjustment device (1) and halfwave rectifier filter (2) one ends of holding concurrently are connected; Said halfwave rectifier filter (2) other end of holding concurrently exports DC/DC converter (3) to; Said DC/DC converter (3) is connected with electric energy meter functional circuit (7); Said zero line, overvoltage and electromagnetic interference monitoring and protective device (4) one ends and the halfwave rectifier filter (2) of holding concurrently is connected with DC/DC converter (3); Said zero line, overvoltage and the electromagnetic interference monitoring and protective device (4) other end are connected with load control unit (5) one ends, and said load control unit (5) other end is connected with distributed weight adjustment device (1).
2. a kind of three-phase intelligent electric energy meter according to claim 1 is used switching power circuit; It is characterized in that: said distributed weight adjustment device (1) comprises power resistor R0, R1, R2 and R3; Said power resistor R0 connects the input side zero-power line, and said power resistor R1, R2 and R3 are connected input side power supply one phase voltage respectively.
3. a kind of three-phase intelligent electric energy meter according to claim 1 is used switching power circuit, it is characterized in that: said halfwave rectifier is held concurrently filter (2) by high-voltage diode D1, D2, D3, and inductance L 1 is formed with high-pressure electrolysis capacitor C 1; The negative electrode of said high-voltage diode D1, D2, D3 links to each other with inductance L 1 one ends, and said inductance L 1 other end links to each other with DC/DC converter (3) input with high-pressure electrolysis capacitor C 1 positive pole, and the negative pole of said high-pressure electrolysis capacitor C 1 links to each other with resistance R 0.
4. a kind of three-phase intelligent electric energy meter according to claim 1 is used switching power circuit; It is characterized in that: said zero line, overvoltage and electromagnetic interference monitoring and protective device (4) are made up of sample circuit (8) and control circuit (9); Said sample circuit (8) is made up of TVS pipe Z1, resistance R 7, diode D9 and resistance R 6; Said control circuit (9) is made up of TVS pipe Z2, resistance R 5, diode D7, diode D8 and P channel-style MOSFET M1; The negative electrode of said TVS pipe Z1 connects the positive pole of high-pressure electrolysis capacitor C 1; The anode of said TVS pipe Z1 connects resistance R 7 one ends; Said resistance R 7 other ends are connected to the anode of diode D9, and the negative electrode of said diode D9 links to each other with the negative electrode of diode D8, the negative electrode of diode D7, the negative electrode of TVS pipe Z2 and the source electrode of P channel-style MOSFET M1, said resistance R 6 one sides and 1 anodal linking to each other of high-pressure electrolysis capacitor C; Said resistance R 6 opposite sides link to each other with resistance R 5 one sides with the anode of TVS pipe Z2, the grid of P channel-style MOSFET M1, and the drain electrode of said P channel-style MOSFET M1 links to each other with diode D7 anode, resistance R 5 opposite sides, inductance L 2 and capacitor C 2 one sides.
5. a kind of three-phase intelligent electric energy meter according to claim 1 is used switching power circuit, it is characterized in that: said load control unit (5) is by high-voltage diode D4, D5 and D6, power resistor R4, and inductance L 2 and capacitor C 2 are formed; The anode of said high-voltage diode D4, D5 and D6 links to each other with resistance R 4 one sides, and said resistance R 4 opposite sides link to each other with inductance L 2 one sides, and said inductance L 2 opposite sides link to each other with resistance R 5 one sides with capacitor C 2.
6. a kind of three-phase intelligent electric energy meter according to claim 2 is used switching power circuit; It is characterized in that: the other end of power resistor R1, R2 and R3 in the said distributed weight adjustment device (1) is connected with the hold concurrently anode of filter (2) input side high-voltage diode D1, D2, D3 of halfwave rectifier respectively, and the negative electrode of load control unit (5) outlet side high-voltage diode D4, D5, D6 connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120239793 CN202160098U (en) | 2011-07-08 | 2011-07-08 | Switch power supply circuit for three-phase intelligent electric energy meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120239793 CN202160098U (en) | 2011-07-08 | 2011-07-08 | Switch power supply circuit for three-phase intelligent electric energy meter |
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| Publication Number | Publication Date |
|---|---|
| CN202160098U true CN202160098U (en) | 2012-03-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120239793 Withdrawn - After Issue CN202160098U (en) | 2011-07-08 | 2011-07-08 | Switch power supply circuit for three-phase intelligent electric energy meter |
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| Country | Link |
|---|---|
| CN (1) | CN202160098U (en) |
Cited By (2)
| 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 |
| WO2017031694A1 (en) * | 2015-08-25 | 2017-03-02 | 深圳市思达仪表有限公司 | Power supply of single-phase electronic electric energy meter |
-
2011
- 2011-07-08 CN CN 201120239793 patent/CN202160098U/en not_active Withdrawn - After Issue
Cited By (3)
| 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 |
| 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 |
| WO2017031694A1 (en) * | 2015-08-25 | 2017-03-02 | 深圳市思达仪表有限公司 | Power supply of single-phase electronic electric energy meter |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120307 Effective date of abandoning: 20151118 |
|
| C25 | Abandonment of patent right or utility model to avoid double patenting |