CN102237809B - A kind of switching power circuit for three-phase intelligent electric energy meter - Google Patents
A kind of switching power circuit for three-phase intelligent electric energy meter Download PDFInfo
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- CN102237809B CN102237809B CN201110190833.5A CN201110190833A CN102237809B CN 102237809 B CN102237809 B CN 102237809B CN 201110190833 A CN201110190833 A CN 201110190833A CN 102237809 B CN102237809 B CN 102237809B
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Abstract
The invention discloses a kind of switching power circuit for three-phase intelligent electric energy meter, it comprises distributed weight adjustment device (1), halfwave rectifier is held concurrently filter (2), zero line, overvoltage and electromagnetic interference are monitored and protective device (4), and load control unit (5), distributed weight adjustment device (1) is powered by three-phase four-wire power (6), distributed weight adjustment device (1) and halfwave rectifier filter (2) one end of holding concurrently is connected, halfwave rectifier filter (2) other end of holding concurrently exports DC/DC converter (3) to, DC/DC converter (3) is connected with electric energy meter functional circuit (7), zero line, hold concurrently filter (2) and DC/DC converter (3) of the monitoring of overvoltage and electromagnetic interference and protective device (4) one end and halfwave rectifier is connected, described zero line, overvoltage is connected with load control unit (5) one end with electromagnetic interference monitoring and protective device (4) other end, load control unit (5) other end and distributed weight adjustment device (1).Advantage of the present invention: low cost, high-reliability, to strong electromagnetic and the interference of extreme harmonic current, there is effective rejection ability.
Description
Technical field
The present invention relates to a kind of switching power circuit for three-phase intelligent electric energy meter, belong to electronic electric energy meter technical field.
Background technology
The most electric energy meter of current China all adopts the line rectification power supply based on Industrial Frequency Transformer to come to table in-line power, and this power-efficient is very low, usually only has 30% to 40%.Along with electric energy meter intellectuality innovation, the power consumption of electric energy meter also increases considerably, the power consumption of such as three-phase meter increases to several watts from original less than one watt, and this is for the hundreds of millions of intelligent electric energy meter being about to promote, and the increase of the overall power consumption of electric energy meter will be very surprising; On the other hand, switch power technology uses power semiconductor to control the conversion of energy fast and efficiently, and electric energy conversion efficiency up to more than 70%, can possess very strong energy-saving and cost-reducing advantage, so it is the desirable upgrading products of electrical power apparent source.But technique will obtain spread, also need to solve a following several difficult problem:
(1), long-term reliability: intelligent electric energy meter needs 24 hours every days, annual 365 days, 10 years continual reliability service, accurate-metering and real time communication.Therefore it is high to the reliability requirement of power supply, considerably beyond to the reliability requirement of the general product for civilian use as computer.
(2), extremely strong anti-electromagnetic interference capability: electrical network high-voltage load switching over or suffer lightening strikes time can cause strong electromagnetic interference.Take semiconductor device as the ability that the Switching Power Supply of core effectively must resist this type of interference, to guarantee the long-term accurate-metering of intelligent electric energy meter.China is vast in territory, and transmission of electricity, power utilization environment is very complicated, and this problem becomes and has more challenge.
(3), anti-harmonic wave interference performance: China's electric railway and heavy industry equipment often discharge a large amount of harmonic wave disturbance current to electrical network, can cause local power voltage Severe distortion.Electric energy meter electric source effectively must suppress this type of interference, keep accurate measurement.
(4), cost has competitiveness: the cost of Switching Power Supply must not higher than the cost of existing linear power supply.
The patents such as Chinese patent CN201811993 " three-phase and four-line low power consumption switch power supply electric energy meter ", Chinese patent CN1410856A " having device and its control method of the electronic circuit of harmonics restraint and voltage stabilizing function " and Chinese patent CN101533082A " a kind of electric energy meter halfwave rectifier circuit " and document propose multiple solution from different perspectives partly, but these solutions can't intactly solve the problem, this is also that Switching Power Supply is not so far yet in the main cause that China's electric energy meter industry is promoted.Therefore, need to provide a kind of new technical scheme to solve above-mentioned technical problem.
Summary of the invention
The object of this invention is to provide a kind of low cost, high-reliability, the switching power circuit for three-phase intelligent electric energy meter with effective rejection ability is disturbed to strong electromagnetic and extreme harmonic current.
The technical solution used in the present invention is:
A kind of switching power circuit for three-phase intelligent electric energy meter, it comprises distributed weight adjustment device, halfwave rectifier is held concurrently filter, zero line, overvoltage and electromagnetic interference are monitored and protective device, and load control unit, described distributed weight adjustment device is powered by three-phase four-wire power, described distributed weight adjustment device and halfwave rectifier filter one end of holding concurrently is connected, the described halfwave rectifier filter other end of holding concurrently exports DC/DC converter to, described DC/DC converter is connected with electric energy meter functional circuit, described zero line, hold concurrently filter and DC/DC converter of the monitoring of overvoltage and electromagnetic interference and protective device one end and halfwave rectifier is connected, described zero line, overvoltage is connected with load control unit one end with electromagnetic interference monitoring and the protective device other end, the described load control unit other end and distributed weight adjustment device.
Described distributed weight adjustment device comprises power resistor R0, R1, R2 and R3, and described power resistor R0 connects input side zero-power line, and described power resistor R1, R2 and R3 are connected input side power supply one phase voltage respectively.
Described halfwave rectifier holds concurrently filter by high-voltage diode D1, D2, D3, inductance L 1 and high-voltage electrolytic capacitor C1 form, the negative electrode of described high-voltage diode D1, D2, D3 is connected with inductance L 1 one end, described inductance L 1 other end is connected with DC/DC converter input with high-voltage electrolytic capacitor C1 positive pole, and the negative pole of described high-voltage electrolytic capacitor C1 is connected with resistance R0.
Described zero line, overvoltage and electromagnetic interference are monitored and protective device is made up of sample circuit and control circuit, described sample circuit is by TVSZ1, resistance R7, diode D9 and resistance R6 forms, described control circuit is by TVSZ2, resistance R5, diode D7, diode D8 and P channel type MOSFETM1 forms, the negative electrode of described TVSZ1 connects the positive pole of high-voltage electrolytic capacitor C1, anode contact resistance R7 one end of described TVSZ1, the described resistance R7 other end is connected to the anode of diode D9, the negative electrode of described diode D9 and the negative electrode of diode D8, the negative electrode of diode D7, the negative electrode of TVSZ2 is connected with the source electrode of P channel type MOSFETM1, described resistance R6 side is connected with high-voltage electrolytic capacitor C1 positive pole, the anode of described resistance R6 opposite side and TVSZ2, the grid of P channel type MOSFETM1 is connected with resistance R5 side, the drain electrode of described P channel type MOSFETM1 and diode D7 anode, resistance R5 opposite side, inductance L 2 is connected with electric capacity C2 side.
Described load control unit is by high-voltage diode D4, D5 and D6, power resistor R4, inductance L 2 and electric capacity C2 form, described high-voltage diode D4, D5 are connected with resistance R4 side with the anode of D6, described inductance L 2 side is connected with resistance R5 opposite side with electric capacity C2, and described resistance R4 opposite side is connected with inductance L 2 opposite side.
Hold concurrently with the halfwave rectifier respectively anode of filter input side high-voltage diode D1, D2, D3 of power resistor R1, R2 in described distributed weight adjustment device and the other end of R3 is connected, and the negative electrode of load control unit outlet side high-voltage diode D4, D5, D6 connects.
The invention has the beneficial effects as follows: by the real-time monitoring of half-wave rectifying and wave-filtering output dc voltage, DC/DC converter voltage and neutral line current and adjustment, in time dynamically to the distributed consumption of input peak voltage, make this power circuit effectively can resist overvoltage or the strong electromagnetic such as pulse, harmonic current suffered by zero line disconnection, mains input side, realization due to this programme is succinct and reliably, thus it has very strong cost advantage and practical value.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is structured flowchart of the present invention.
Fig. 2 is circuit theory diagrams of the present invention.
Wherein: 1, distributed weight adjustment device, 2, halfwave rectifier holds concurrently filter, 3, 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, electric energy meter functional circuit, 8, sample circuit, 9, control circuit.
Embodiment
As illustrated in fig. 1 and 2, a kind of switching power circuit for three-phase intelligent electric energy meter of the present invention, it comprises distributed weight adjustment device 1, halfwave rectifier is held concurrently filter 2, zero line, overvoltage and electromagnetic interference are monitored and protective device 4, and load control unit 5, distributed weight adjustment device 1 is powered by three-phase four-wire power 6, distributed weight adjustment device 1 and halfwave rectifier filter 2 one end of holding concurrently is connected, halfwave rectifier filter 2 other end of holding concurrently exports DC/DC converter 3 to, DC/DC converter 3 is connected with electric energy meter functional circuit 7, zero line, hold concurrently filter 2 and DC/DC converter 3 of the monitoring of overvoltage and electromagnetic interference and protective device 4 one end and halfwave rectifier is connected, zero line, overvoltage is connected with load control unit 5 one end with electromagnetic interference monitoring and protective device 4 other end, load control unit 5 other end and distributed weight adjustment device 5, 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 input side zero-power line, and power resistor R1, R2 and R3 are connected input side power supply one phase voltage respectively, halfwave rectifier holds concurrently filter 2 by high-voltage diode D1, D2, D3, inductance L 1 and high-voltage electrolytic capacitor C1 form, the negative electrode of high-voltage diode D1, D2, D3 is connected with inductance L 1 one end, inductance L 1 other end is connected with DC/DC converter input with high-voltage electrolytic capacitor C1 positive pole, and the negative pole of high-voltage electrolytic capacitor C1 is connected with resistance R0, zero line, overvoltage and electromagnetic interference are monitored and protective device 4 is made up of sample circuit 8 and control circuit 9, sample circuit 8 is by TVSZ1, resistance R7, diode D9 and resistance R6 forms, control circuit 9 is by TVSZ2, resistance R5, diode D7, diode D8 and P channel type MOSFETM1 forms, the negative electrode of TVSZ1 connects the positive pole of high-voltage electrolytic capacitor C1, anode contact resistance R7 one end of TVSZ1, the resistance R7 other end is connected to the anode of diode D9, the negative electrode of diode D9 and the negative electrode of diode D8, the negative electrode of diode D7, the negative electrode of TVSZ2 is connected with the source electrode of P channel type MOSFETM1, resistance R6 side is connected with high-voltage electrolytic capacitor C1 positive pole, the anode of resistance R6 opposite side and TVSZ2, the grid of P channel type MOSFETM1 is connected with resistance R5 side, the drain electrode of P channel type MOSFETM1 and diode D7 anode, resistance R5 opposite side, inductance L 2 is connected with electric capacity C2 side, load control unit 5 is by high-voltage diode D4, D5 and D6, power resistor R4, inductance L 2 and electric capacity C2 form, and high-voltage diode D4, D5 are connected with resistance R4 side with the anode of D6, inductance L 2 side is connected with resistance R5 opposite side with electric capacity C2, and resistance R4 opposite side is connected with inductance L 2 opposite side, hold concurrently with the halfwave rectifier respectively anode of filter 2 input side high-voltage diode D1, D2, D3 of power resistor R1, R2 in distributed weight adjustment device 1 and the other end of R3 is connected, 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 voltage is normal, power supply input ac voltage is carried out halfwave rectifier and low-pass filtering by halfwave rectifier filter 2 of holding concurrently; Compared with conventional full-wave rectification scheme, the direct-current working volts amplitude that this scheme exports DC/DC converter 3 to is halved, the maximum operating range of the high-voltage semi-conductor device used in DC/DC converter 3 is reduced by half, thus design cost is minimized, product reliability is enhanced.When mains input side zero line disconnects, common half-wave rectifying circuit cannot normally work.The present invention program adopts zero line monitoring device to open standby current passage in time, thus guaranteeing to export to DC/DC, to convert 3 device voltages normal.When mains input side is subject to overvoltage or pulse, during the strong electromagnetic such as harmonic current, zero line, overvoltage and electromagnetic interference are monitored and protective device 4 dynamic ground carries out dividing potential drop adjustment to rectifier power source output dc voltage, and consumed in time by distributed weight adjustment device 1 pair of excess energy, thus avoid rectification outlet side direct voltage because of input side pulse, the lasting of the peak voltage that the electromagnetic interference such as harmonic wave are formed is added up and causes suffered voltage on DC/DC converter 3 raise gradually and damage, this also avoids and use expensive control and high-voltage semi-conductor device in DC/DC converter 3, and greatly strengthen the reliability of circuit, another feature of the present invention program is that the realization of above-mentioned functions is based on succinct Power Electronic Circuit, and thus it has very strong cost advantage and practical value.
Claims (1)
1. a switching power circuit for three-phase intelligent electric energy meter, it is characterized in that: it comprises distributed weight adjustment device (1), halfwave rectifier is held concurrently filter (2), zero line, overvoltage and electromagnetic interference are monitored and protective device (4), and load control unit (5), described distributed weight adjustment device (1) is powered by three-phase four-wire power (6), described distributed weight adjustment device (1) and halfwave rectifier filter (2) one end of holding concurrently is connected, described halfwave rectifier filter (2) other end of holding concurrently exports DC/DC converter (3) to, described DC/DC converter (3) is connected with electric energy meter functional circuit (7), described zero line, hold concurrently filter (2) and DC/DC converter (3) of the monitoring of overvoltage and electromagnetic interference and protective device (4) one end and halfwave rectifier is connected, described zero line, overvoltage is connected with load control unit (5) one end with electromagnetic interference monitoring and protective device (4) other end, described load control unit (5) other end is connected with distributed weight adjustment device (1),
Described zero line, overvoltage and electromagnetic interference are monitored and protective device (4) is made up of sample circuit (8) and control circuit (9), and described sample circuit (8) is by transient diode Z1, resistance R7, diode D9 and resistance R6 forms, and described control circuit (9) is by transient diode Z2, resistance R5, diode D7, diode D8 and P channel type MOSFETM1 forms, the negative electrode of described transient diode Z1 connects the positive pole of high-voltage electrolytic capacitor C1, anode contact resistance R7 one end of described transient diode Z1, the described resistance R7 other end is connected to the anode of diode D9, the negative electrode of described diode D9 and the negative electrode of diode D8, the negative electrode of diode D7, the negative electrode of transient diode Z2 is connected with the source electrode of P channel type MOSFETM1, and described resistance R6 side is connected with high-voltage electrolytic capacitor C1 positive pole, the anode of described resistance R6 opposite side and transient diode Z2, the grid of P channel type MOSFETM1 is connected with resistance R5 side, the drain electrode of described P channel type MOSFETM1 and diode D7 anode, resistance R5 opposite side, inductance L 2 is connected with electric capacity C2 side.
2
.a kind of switching power circuit for three-phase intelligent electric energy meter according to claim 1, it is characterized in that: described distributed weight adjustment device (1) comprises power resistor R0, R1, R2 and R3, described power resistor R0 connects input side zero-power line, and described power resistor R1, R2 and R3 are connected input side power supply one phase voltage respectively.
3
.a kind of switching power circuit for three-phase intelligent electric energy meter according to claim 1, it is characterized in that: described halfwave rectifier holds concurrently filter (2) by high-voltage diode D1, D2, D3, inductance L 1 and high-voltage electrolytic capacitor C1 form, the negative electrode of described high-voltage diode D1, D2, D3 is connected with inductance L 1 one end, described inductance L 1 other end is connected with DC/DC converter (3) input with high-voltage electrolytic capacitor C1 positive pole, and the negative pole of described high-voltage electrolytic capacitor C1 is connected with resistance R0.
4
.a kind of switching power circuit for three-phase intelligent electric energy meter according to claim 1, it is characterized in that: described load control unit (5) is by high-voltage diode D4, D5 and D6, power resistor R4, inductance L 2 and electric capacity C2 form, described high-voltage diode D4, D5 are connected with resistance R4 side with the anode of D6, described inductance L 2 side is connected with resistance R5 opposite side with electric capacity C2, and described resistance R4 opposite side is connected with inductance L 2 opposite side.
5
.a kind of switching power circuit for three-phase intelligent electric energy meter according to claim 2, it is characterized in that: hold concurrently with the halfwave rectifier respectively anode of filter (2) input side high-voltage diode D1, D2, D3 of power resistor R1, R2 in described distributed weight adjustment device (1) and the other end of R3 is connected, and the negative electrode of load control unit (5) outlet side high-voltage diode D4, D5, D6 connects.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110190833.5A CN102237809B (en) | 2011-07-08 | 2011-07-08 | A kind of switching power circuit for three-phase intelligent electric energy meter |
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| CN201110190833.5A CN102237809B (en) | 2011-07-08 | 2011-07-08 | A kind of switching power circuit for three-phase intelligent electric energy meter |
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| CN102237809A CN102237809A (en) | 2011-11-09 |
| CN102237809B true CN102237809B (en) | 2015-11-18 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102539858A (en) * | 2011-12-19 | 2012-07-04 | 深圳市思达仪表有限公司 | Single-phase electric energy meter circuit applying non-isolated switch power supply scheme |
| CN103488912A (en) * | 2013-10-23 | 2014-01-01 | 江苏省计量科学研究院 | Harmonic-factor-based electronic electric energy meter reliability prediction method |
| CN105099227B (en) * | 2014-05-23 | 2017-12-19 | 广东美的暖通设备有限公司 | Three-phase semiwave times voltage commutation device and motor driver and air conditioner |
| CN105510705A (en) * | 2015-12-10 | 2016-04-20 | 重庆鸿引电子有限公司 | Multifunctional electric power instrument |
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| US6995685B2 (en) * | 2001-09-25 | 2006-02-07 | Landis+Gyr, Inc. | Utility meter power arrangements and methods |
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| CN2160151Y (en) * | 1992-12-14 | 1994-03-30 | 北京天石科技发展公司 | Multifunctional breaker |
| CN1296323A (en) * | 2000-10-19 | 2001-05-23 | 成都希望电子研究所 | Power supply with user's peak adjusting |
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Address after: 226200 Jiangsu city of Nantong province Qidong Economic Development Zone No. 666 Lin Yang Lu Patentee after: JIANGSU LINYANG ENERGY CO., LTD. Address before: Qidong City, Jiangsu province 226200 Nantong City Economic Development Zone No. 666 Lin Yang Lu Patentee before: Jiangsu Linyang Electronics Co., Ltd. |