CN1335668A - Voltage balancer circuit for power converter - Google Patents
Voltage balancer circuit for power converter Download PDFInfo
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- CN1335668A CN1335668A CN 01125171 CN01125171A CN1335668A CN 1335668 A CN1335668 A CN 1335668A CN 01125171 CN01125171 CN 01125171 CN 01125171 A CN01125171 A CN 01125171A CN 1335668 A CN1335668 A CN 1335668A
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Abstract
The voltage balancer circuit is one in-phase controlled common magnetic core counterexciting circuit and has common input power voltage with the converter. The voltage balancer circuit has two primary coiles in the same turns and two power diodes connected to in phase pulse. In case of some voltage difference exists, the voltage balancer circuit produces loop circuit to balance the voltage, raise the output characteristic, avoid overvoltage across the capacitor and protect the elements.
Description
Technical field the present invention relates to a kind of equalizer circuit that is used for supply convertor.
Background technology in the converter (comprising DC-DC DC/DC converter and AC/DC DC/AC converter) of high-power output, because the power output of single inverter is limited, generally can adopt the series, parallel of converter to wait the capacity that enlarges power output.When higher, adopt the one-level converter can have unfavorable factors such as stresses of parts is big, switching frequency is low, cost is high, volume is big as input supply voltage.Can adopt former limit series connection (secondary can the be exported in parallel or separately) technology of two same converter to this, wherein the input end capacitor of two converters equates and series connection; The parameter unanimity of two converters.The input supply voltage on each former limit of converter is because capacitance partial pressure reduces half like this, and respective switch stress can reduce half; When secondary was in parallel, electric current, the power of each converter output all reduced half (when secondary was exported separately, load needed consistent), the selection design of power device, transformer, filter inductance is all brought lot of advantages, and can work in higher frequency.But reason such as the driving pulsewidth that causes owing to the parameter discrete of two-way converter in the side circuit is inconsistent, efficient is inconsistent all can cause the power output of two converters unequal.The voltage of the dividing potential drop electric capacity of input dc bus does not wait like this, the uneven pressure promptly occur.The parameter of general two converters is selected the same, when middle heavy load, delivery efficiency is similar, might be bigger by driving the power difference absolute value that reasons such as duty ratio is inconsistent cause, but the phase specific power output then is much smaller, and therefore the two-way dividing potential drop is equal substantially down in heavy duty.Under underloading, the power difference absolute value might be less, but have comparativity with power output, and the difference of two-way dividing potential drop is just very big like this, causes the inequality of input capacitance to press.Under the very light situation of load, circuit working might cause serious uneven pressure of input capacitance in the discontinuous operation state.When situation is serious even a power output not substantially can occur can having in two converters, another converter is sent very little power.This moment, one road input voltage was zero, and the twice that another road input voltage is a normal voltage is uneven limiting case of pressing.Because capacitance voltage is withstand voltage limited, uneven pressure can make capacitance voltage exceed rated insulation voltage, and makes the switching tube of converter, the withstand voltage converter of damaging inadequately of output rectifier diode.
Summary of the invention the object of the invention is exactly in order to overcome the above problems, and a kind of equalizer circuit that is used for supply convertor is provided, and to realize all pressures between each unit in the converter, make its input capacitance voltage stable, and each element is not easily damaged.
The present invention realizes that the scheme of above-mentioned purpose is: a kind of equalizer circuit that is used for supply convertor, be used for the supply convertor that is composed in series by at least two former limits of power converter cells, realize all pressures between each power converter cells, it is characterized in that: described equalizer circuit adopts the common magnetic core circuit of reversed excitation of homophase control, promptly comprise a transformer, this transformer comprises two primary coils of magnetic core altogether, two primary coil numbers of turn are identical, respectively with the 5th, series connection mutually again after six power switch pipes are in series, the tie point of two primary coils links to each other with the center line of converter, the other end on two former limits respectively with the input anode of converter, the input negative terminal links to each other; Two power switch pipes link to each other with in-phase pulse.
Owing to adopt above scheme, when having pressure reduction between each unit of converter, produce loop current, and realize all pressing by equalizer circuit, improve the output characteristic of circuit, and avoided the electric capacity two ends to exceed rated insulation voltage, make each element avoid damaging.
Description of drawings Fig. 1 is the parallel extended circuit diagram of former limit series connection secondary of converter.
Fig. 2 is an equalizer circuit schematic diagram of the present invention.
Equivalent electric circuit during Fig. 3 a switch conduction that is equalizer circuit shown in Figure 2 under equal press strip spares.
Fig. 3 b is equalizer circuit shown in Figure 2 equivalent electric circuit during switch conduction under uneven press strip spare.
Fig. 4 is a specific embodiment of the invention test schematic;
The specific embodiment is below by specific embodiment and by reference to the accompanying drawings to this practicality Novel being described in further detail.
See Fig. 1, be depicted as is that the dilatation circuit diagram of the former limit of two DC to DC converter series connection secondary parallel connection in the practical application is (for DC/AC inverter and secondary situation not in parallel, therewith identical, below no longer give an example), the input power of establishing two DC to DC converter is respectively P1And P2, capacitor C during stable state then1And capacitor C2Average DC current be zero, The input average current of two DC to DC converter is identical. If the two-way branch pressure voltage is respectively Vc1And Vc2So, can calculate the two-way branch pressure voltage and be:
Because: P1＝V
c1×I
1avg P
2＝V
c2×I
2avg
And: I1avg＝I
2avg
So: Vc1/V
c2=P
1/P
2
If
Then:
The parameter of general two converters is selected the same, and when middle heavy load, delivery efficiency is similar, the power difference that the grade that is caused by the driving dutycycle causesAbsolute value might be bigger, but the phase specific power output then is much smaller, namelySo lower V of heavy dutyc1≈V
c2 Under underloading,
Absolute value might be littler, but have comparativity with power output, like this Vc1And Vc2Difference just very big, serious uneven pressure of causing input capacitance. Very light in load Situation under, circuit working is in the discontinuous operation state, when situation is serious even two changes can occur Parallel operation can have a substantially power output not, and another converter is sent very little power. If P1=0, but this moment, then Vc1=0，V
c2Be input voltage, be the twice of normal voltage, this The time be uneven limiting case of pressing. Because capacitance voltage is withstand voltage limited, uneven pressure can make the electric capacity electricity Pressure exceeds rated insulation voltage, and make converter switching tube, output commutation diode withstand voltage not enough And the damage converter.
More than analyzed series transformer in the easy uneven reason of pressing of underloading, must increase for this reason Add adequate measures, two converters are all pressed under underloading. The present invention proposes to adopt and have The auxiliary power circuit of firm power output is realized all pressing.
Fig. 2 is equalizer circuit schematic diagram of the present invention. This equalizer circuit 1 adopts with facies-controlled common The magnetic core circuit of reversed excitation namely comprises a transformer T1, and it comprises two altogether primary coils of magnetic core, Two primary coil numbers of turn are identical, after being in series with the 5th, six power switch pipe Q5, Q6 respectively Again series connection, the tie point of two primary coils links to each other two with the center line of DC to DC converter The other end on individual former limit links to each other with input anode, the input negative terminal of converter respectively, that is to say, Equalizer circuit 1 is total to input supply voltage with inverter main circuit. Two power switch pipe Q5, Q6 Link to each other with in-phase pulse. In Fig. 2, main circuit part two electric capacity (C1, C2) that only drawn.
When two switching tube Q5, Q6 send a same pulse up and down, the two conducting. At this moment Circuit of reversed excitation does not have energy and delivers to secondary, at this moment energy storage in the transformer primary side magnetizing inductance. When input capacitance voltage was all pressed, two circuit of reversed excitation work were consistent up and down, do not have the friendship of energy Change, only have two the former limit of anti exciting converter magnetizing inductance energy storage, its equivalent circuit shown in Fig. 3 a, Wherein Lk1, Lk2 are two corresponding leakage inductances of circuit of reversed excitation, and Lm1, Lm2 are two anti-sharp electricity The corresponding magnetizing inductance in road.
When if the input voltage of two variators is inconsistent, there is energy in two circuit of reversed excitation Exchange. Because two former limit Motor Winding Same Name of Ends are identical, be the normal shock relation, namely transformer concerns, Then energy is poured into the low Na Yilu of input voltage from the high Na Yilu of input voltage, realizes all pressing. Suppose Vc1＞Vc2, at this moment the equivalent circuit of the duty of equalizer circuit and power flow direction are such as figure Shown in the 3b.
For anti-sharp power transformer air gap is arranged generally, have leakage inductance, so capacitor C 1 is whenever Equalizing current in the individual switch periods is: I1=(Vc1-Vc2) * Ton/LK1, capacitor C 2 Equalizing current be: I2=(Vc1-Vc2) * Ton/LK2, wherein Ton is each switch The switch conduction time in cycle. Consider that all to press the pressure reduction of rear capacitor C 1, C2 little, And the existence of leakage inductance, so this electric current is not too large. Have no progeny when switching tube closes, have transformation Energy in the device is to the secondary energy supply. Press if input voltage is uneven, then only have high that of input voltage One the tunnel could to the auxiliary supply transformer storage power, so the power of accessory power supply is more big, all press Effect is more good. Have no progeny when switching tube closes, exist the energy in the transformer to supply to secondary by instead swashing Energy. Can analyze accessory power supply and carry out dynamic voltage balancing according to switching frequency, all press better performances.
Be illustrated in figure 4 as the test schematic of the specific embodiment of the invention; This circuit is in reality In be verified. Its main circuit topology be the parallel connection of former limit series connection secondary two forward DCs/ The DC converter circuit, DC to DC converter unit number wherein is two, the two former limit Two ends, the former limit of transformer T2, T3 in the series connection, two power converter cells respectively with first to fourth Power switch pipe Q1-Q4 links to each other, and the control end of these four power switch pipe Q1-Q4 then Output signal G1-G4 with controller DC/DC Controller links to each other controller respectively The input of DC/DC Controller then links to each other with transformer T1 secondary in the equalizer circuit 1.
Described buffer circuit is the coupling coil circuit, primary coil one termination the 6th power switch Pipe Q6 control end G6, the secondary Same Name of Ends connects the 5th power switch pipe Q5's by adapter circuit Control end G5, another termination the 6th switching tube Q6 ground, former limit end G6_GND, secondary another The ground end G5_GND of termination the 5th power switch pipe Q5.
Except above-described embodiment, for specific embodiments of the invention, equalizer circuit also Can be the output of single channel or multichannel, converter can be DC/AC inverter, and secondary can Not in parallel. The 6th switching tube Q6 and the 5th switching tube Q5 also can be by other controller controls. In actual applications, equally also can be used for the conversion of the former limit series connection more than the two-way for this circuit Device. Fine through this equalizer circuit of evidence effect, circuit control is simple, reliable, in reality Be applied in the product.
Because all press general can occur in light condition, the required power output of equalizer circuit also Not very big. Simultaneously, each converter itself needs accessory power supply, and its power output is relatively steady Fixed. The power that this be the present invention proposes the employing accessory power supply remedies up and down, and the two-way converter exists Input power under the underloading is inconsistent, to reach the purpose of all pressing.
Claims (4)
1. equalizer circuit that is used for supply convertor, be used for the supply convertor that is composed in series by at least two former limits of power converter cells, realize all pressures between each power converter cells, it is characterized in that: described equalizer circuit (1) adopts the common magnetic core circuit of reversed excitation of homophase control, promptly comprise a transformer (T1), this transformer (T1) comprises two primary coils of magnetic core altogether, two primary coil numbers of turn are identical, respectively with the 5th, six power switch pipe (Q5, Q6) be in series after more mutually the series connection, the tie point of two primary coils links to each other with the center line of converter, the other end on two former limits respectively with the input anode of converter, the input negative terminal links to each other; Two power switch pipes (Q5, Q6) link to each other with in-phase pulse.
2. the equalizer circuit that is used for supply convertor as claimed in claim 1 is characterized in that: the transformer secondary of described equalizer circuit (1) has one or more output, and can be used as the accessory power supply of converter.
3. the equalizer circuit that is used for supply convertor as claimed in claim 1 or 2, it is characterized in that: also comprise pilot controller (AUX Controller), the pulse control signal that its output produces is connected to the control end (G6) of the 6th power switch pipe (Q6), and is connected to the control end (G5) of the 5th power switch pipe (Q5) through another control signal of buffer circuit generation homophase.
4. the equalizer circuit that is used for supply convertor as claimed in claim 3, it is characterized in that: described buffer circuit is the coupling coil circuit, primary coil one termination the 6th power switch pipe (Q6) control end (G6), secondary end of the same name connects the control end (G5) of the 5th power switch pipe (Q5) by adapter circuit, another termination the 6th switching tube of former limit is held (G6_GND) (Q6), the ground end (G5_GND) of another termination the 5th power switch pipe (Q5) of secondary.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01125171 CN1126236C (en) | 2001-08-24 | 2001-08-24 | Voltage balancer circuit for power converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01125171 CN1126236C (en) | 2001-08-24 | 2001-08-24 | Voltage balancer circuit for power converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1335668A true CN1335668A (en) | 2002-02-13 |
| CN1126236C CN1126236C (en) | 2003-10-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01125171 Expired - Lifetime CN1126236C (en) | 2001-08-24 | 2001-08-24 | Voltage balancer circuit for power converter |
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| CN (1) | CN1126236C (en) |
Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101132151B (en) * | 2007-08-15 | 2010-05-26 | 艾默生网络能源有限公司 | Electric power supply converter |
| CN101860201A (en) * | 2010-05-05 | 2010-10-13 | 浙江大学 | Method for realizing voltage equalizing during serial connection of multiple high-frequency power electronic devices |
| CN102142770A (en) * | 2011-04-08 | 2011-08-03 | 上海交通大学 | Series flyback switch power supply controlled by hysteresis loop |
| CN102255549A (en) * | 2011-07-20 | 2011-11-23 | 珠海金电电源工业有限公司 | Switching power supply application circuit |
| CN101610026B (en) * | 2008-06-18 | 2012-12-05 | 力博特公司 | Protective circuit for balanced circuit of power converter |
| CN103236786A (en) * | 2013-04-17 | 2013-08-07 | 华为技术有限公司 | Voltage-sharing circuit and inverter |
| CN103280975A (en) * | 2013-05-16 | 2013-09-04 | 北京波尔通信电源设备有限公司 | Extendable high direct voltage input power supply and extension method |
| CN103548249A (en) * | 2011-05-25 | 2014-01-29 | 邦及奥卢夫森公司 | Power supply arrangement for single ended class d amplifier |
| CN103607121A (en) * | 2013-11-22 | 2014-02-26 | 广州金升阳科技有限公司 | Series circuit of converter |
| CN103762834A (en) * | 2013-12-31 | 2014-04-30 | 江苏嘉钰新能源技术有限公司 | Auxiliary power supply of three-phase three-level VIENNA rectifier |
| CN107482884A (en) * | 2017-09-20 | 2017-12-15 | 江苏兆能电子有限公司 | One kind input Pressure and Control circuit |
| CN108233723A (en) * | 2018-03-26 | 2018-06-29 | 珠海格力电器股份有限公司 | Flyback circuit and flyback converter |
| CN109962624A (en) * | 2019-04-22 | 2019-07-02 | 浙江万胜智能科技股份有限公司 | A kind of equalizer circuit for supply convertor |
| WO2020034664A1 (en) * | 2018-08-14 | 2020-02-20 | 广州金升阳科技有限公司 | Multilevel step-down circuit |
| CN112134296A (en) * | 2020-09-16 | 2020-12-25 | 西安爱科赛博电气股份有限公司 | Three-level static var generator with auxiliary voltage sharing and voltage sharing method thereof |
| CN113612393A (en) * | 2021-08-30 | 2021-11-05 | 阳光电源股份有限公司 | Power supply circuit, direct current power supply and photovoltaic system |
| CN114537169A (en) * | 2022-03-28 | 2022-05-27 | 华人运通(山东)科技有限公司 | High-power wireless charger and vehicle-mounted end power supply circuit and control method thereof |
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| CN100448153C (en) * | 2004-09-24 | 2008-12-31 | 南京航空航天大学 | Back exciting converter main circuit topology |
| CN1710790B (en) * | 2005-07-08 | 2010-12-08 | 浙江大学 | Control system capable of regualting pulse width of multiple switch changer |
| CN106533165B (en) * | 2017-01-06 | 2019-11-08 | 深圳市核达中远通电源技术股份有限公司 | Voltage-sharing circuit for converter |
-
2001
- 2001-08-24 CN CN 01125171 patent/CN1126236C/en not_active Expired - Lifetime
Cited By (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101132151B (en) * | 2007-08-15 | 2010-05-26 | 艾默生网络能源有限公司 | Electric power supply converter |
| CN101610026B (en) * | 2008-06-18 | 2012-12-05 | 力博特公司 | Protective circuit for balanced circuit of power converter |
| CN101860201A (en) * | 2010-05-05 | 2010-10-13 | 浙江大学 | Method for realizing voltage equalizing during serial connection of multiple high-frequency power electronic devices |
| CN101860201B (en) * | 2010-05-05 | 2012-09-26 | 浙江大学 | Method for realizing voltage equalizing during serial connection of multiple high-frequency power electronic devices |
| CN102142770A (en) * | 2011-04-08 | 2011-08-03 | 上海交通大学 | Series flyback switch power supply controlled by hysteresis loop |
| CN102142770B (en) * | 2011-04-08 | 2013-05-01 | 上海交通大学 | Series flyback switch power supply controlled by hysteresis loop |
| EP2533408A3 (en) * | 2011-05-25 | 2017-11-01 | Icepower A/S | Power supply arrangement for single ended class D amplifier |
| CN103548249B (en) * | 2011-05-25 | 2017-05-10 | 爱思动力公司 | Power supply arrangement for single ended class d amplifier |
| CN103548249A (en) * | 2011-05-25 | 2014-01-29 | 邦及奥卢夫森公司 | Power supply arrangement for single ended class d amplifier |
| CN102255549A (en) * | 2011-07-20 | 2011-11-23 | 珠海金电电源工业有限公司 | Switching power supply application circuit |
| CN103236786B (en) * | 2013-04-17 | 2016-03-09 | 华为技术有限公司 | A kind of equalizer circuit and inverter |
| CN103236786A (en) * | 2013-04-17 | 2013-08-07 | 华为技术有限公司 | Voltage-sharing circuit and inverter |
| CN103280975A (en) * | 2013-05-16 | 2013-09-04 | 北京波尔通信电源设备有限公司 | Extendable high direct voltage input power supply and extension method |
| CN103607121A (en) * | 2013-11-22 | 2014-02-26 | 广州金升阳科技有限公司 | Series circuit of converter |
| CN103762834A (en) * | 2013-12-31 | 2014-04-30 | 江苏嘉钰新能源技术有限公司 | Auxiliary power supply of three-phase three-level VIENNA rectifier |
| CN107482884A (en) * | 2017-09-20 | 2017-12-15 | 江苏兆能电子有限公司 | One kind input Pressure and Control circuit |
| CN108233723A (en) * | 2018-03-26 | 2018-06-29 | 珠海格力电器股份有限公司 | Flyback circuit and flyback converter |
| WO2020034664A1 (en) * | 2018-08-14 | 2020-02-20 | 广州金升阳科技有限公司 | Multilevel step-down circuit |
| CN109962624A (en) * | 2019-04-22 | 2019-07-02 | 浙江万胜智能科技股份有限公司 | A kind of equalizer circuit for supply convertor |
| CN109962624B (en) * | 2019-04-22 | 2024-03-12 | 浙江万胜智能科技股份有限公司 | Voltage equalizing circuit for power converter |
| CN112134296A (en) * | 2020-09-16 | 2020-12-25 | 西安爱科赛博电气股份有限公司 | Three-level static var generator with auxiliary voltage sharing and voltage sharing method thereof |
| CN112134296B (en) * | 2020-09-16 | 2022-03-11 | 西安爱科赛博电气股份有限公司 | Three-level static var generator with auxiliary voltage sharing and voltage sharing method thereof |
| CN113612393A (en) * | 2021-08-30 | 2021-11-05 | 阳光电源股份有限公司 | Power supply circuit, direct current power supply and photovoltaic system |
| CN114537169A (en) * | 2022-03-28 | 2022-05-27 | 华人运通(山东)科技有限公司 | High-power wireless charger and vehicle-mounted end power supply circuit and control method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1126236C (en) | 2003-10-29 |
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Address after: 518057 Nanshan District science and Technology Industrial Park, Guangdong, Shenzhen Branch Road, No. Patentee after: Vitamin Technology Co., Ltd. Address before: 518057 Nanshan District science and Technology Industrial Park, Guangdong, Shenzhen Branch Road, No. Patentee before: Aimosheng Network Energy Source Co., Ltd. |
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Granted publication date: 20031029 |
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