CN104362840A - Load-side control series-connection IGBT (Insulated Gate Bipolar Translator) voltage-sharing circuit - Google Patents
Load-side control series-connection IGBT (Insulated Gate Bipolar Translator) voltage-sharing circuit Download PDFInfo
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- CN104362840A CN104362840A CN201410759908.0A CN201410759908A CN104362840A CN 104362840 A CN104362840 A CN 104362840A CN 201410759908 A CN201410759908 A CN 201410759908A CN 104362840 A CN104362840 A CN 104362840A
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- voltage
- igbt
- branch road
- circuit
- buffering
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/08—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
- H02M1/088—Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Power Conversion In General (AREA)
Abstract
The invention discloses a load-side control series-connection IGBT (Insulated Gate Bipolar Translator) voltage-sharing circuit. The load-side control series-connection IGBT (Insulated Gate Bipolar Translator) voltage-sharing circuit comprises at least two series-connection main IGBTs, wherein each main IGBT is connected with one buffering voltage-sharing unit, the buffering voltage-sharing unit comprises an RCD (residual current device) buffering branched circuit connected between the collector electrode and the emitting electrode of the main IGBT in parallel, the RCD buffering branched circuit is connected with a resistance voltage-sharing branched circuit in parallel, the midpoint of the resistance voltage-sharing branched circuit is connected with the input end of a voltage follower/voltage comparator, the output end of the voltage follower/voltage comparator and one end of the resistance voltage-sharing branched circuit are connected with the first input end and the second input end of a primary winding of a voltage transformer respectively, two ends of a secondary winding of the voltage transformer are connected with the grid electrode and the emitting electrode of an assisted IGBT respectively, the emitting electrode of the assisted IGBT is connected with the second input end of the primary winding of the voltage transformer, the collector electrode of the assisted IGBT of the buffering voltage-sharing unit is connected with an assisted buffering branched circuit, and the assisted buffering branched circuit is connected with the other end of the resistance voltage-sharing branched circuit. According to the load-side control series-connection IGBT voltage-sharing circuit, the influence of the assisted IGBT on resistance sample can be avoided, the sampling precision is improved and the voltage balance of the circuit is ensured.
Description
Technical field
The present invention relates to a kind of load-side and control series IGBT equalizer circuit.
Background technology
Oversea wind power generation becomes the focus of research both at home and abroad recently, and HVDC Light technology can provide more reactive power support to wind energy turbine set, reduces the investment of Reactive Compensation in Wind Farm equipment; Avoid wind energy turbine set voltage fluctuation on the impact of the reliability of system, also improve the antijamming capability that wind energy turbine set fluctuates to system voltage; HVDC Light technology is much less by the impact of voltage transmission range than alternating voltage transmission of electricity, is more suitable for long distance power transmission; And HVDC Light technology can improve the low voltage ride-through capability of wind energy turbine set.Therefore the remote marine transmission of electricity of Large marine adopts HVDC Light to be optimal selection.But the electric voltage equalization problem of IGBT converter valve is the difficult point of HVDC Light technology always.Because IGBT holds quantitative limitation, need multiple IGBT to connect and improve the capacity of IGBT, because IGBT converter valve switching speed is fast, device there are differences itself, the asynchronous grade of Signal transmissions thus will the unbalanced-voltage-division of voltage be caused to weigh, electric stress when particularly dynamic electric voltage is unbalanced impacts more may cause the faults such as IGBT series valve burns out, and therefore needs peripheral auxiliary circuit to regulate the electric voltage equalization of IGBT series connection converter valve.
Because RCD buffer circuit feature is that circuit is simple, good reliability, in the application such as present HVDC Light, the normal RCD buffer circuit that adopts is as IGBT series average-voltage circuit.But the energy that RCD buffer circuit absorbs directly consumes on resistance, thus loss ratio is comparatively large, and the volume ratio of buffer capacitor is comparatively large, and cost is higher.The size of buffer capacitor and turn-off time are the parameters of conflict, and buffer capacitor is larger, all press effect can be better, but the turn-off time can extend, and thus corresponding loss can increase.But when buffer capacitor is less, although the turn-off time is shorter, the overvoltage spike that IGBT collector electrode-emitter two ends are born may be comparatively large, thus all press effect may not be very desirable.Under normal circumstances, IGBT grid is asynchronous within 20ns, and thus the voltage that causes of grid time delay is unbalanced less under normal circumstances, thus can meet at collector electrode-emitter of IGBT less buffer capacitor in parallel and all press demand.But when occur the signal of special circumstances asynchronous time longer or other reasons cause voltage unbalanced larger time, can normally work in order to ensure IGBT series connection converter valve, need larger buffer capacitor ability over-voltage suppression spike, realize all pressing effect preferably.In the engineer applied of reality, must consider from the reliability of system, therefore IGBT converter valve of connecting is that cause the pass section time of IGBT series valve longer, turn-off power loss is larger for most extreme case to select the size of buffer capacitor.
The existing load-side solved the problem controls series IGBT equalizer circuit and sees Fig. 1, and its defect does not have quarantine measures between the resistance of sampled voltage and voltage comparator, causes the supplementary structures such as auxiliary IGBT comparatively large on voltage sample impact, sampling inaccuracy; This circuit comprises multiple independently auxiliary buffering branch road, and each auxiliary buffering branch road comprises an electric capacity, and electric capacity quantity is more, when overvoltage appears in multiple main IGBT, cannot realize electric voltage equalization.
Summary of the invention
Technical problem to be solved by this invention is, for above-mentioned the deficiencies in the prior art, provides a kind of load-side to control series IGBT equalizer circuit.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of load-side controls series IGBT equalizer circuit, comprises the main IGBT of at least two series connection, and each main IGBT cushions pressure unit be connected with one; Described buffering pressure unit comprises the RCD be connected in parallel between described main IGBT collector and emitter and cushions branch road; Described RCD cushions branch road and resistance all presses branch circuit parallel connection; Described resistance all presses branch road mid point to be connected with voltage follower/voltage comparator input; Described voltage follower/voltage comparator output, resistance all press branch road one end, and limit former in voltage transformer winding first input end, the second input are connected respectively; Described voltage transformer time winding two ends, limit are connected with the grid of auxiliary IGBT, emitter respectively; The emitter of described auxiliary IGBT is connected with voltage transformer former limit winding second input; The auxiliary IGBT collector electrode of all buffering pressure units all cushions branch road be connected with auxiliary; Described auxiliary buffering branch road all presses the branch road other end to be connected with described resistance.
Described main IGBT, buffering pressure unit quantity are two; Described auxiliary buffering branch road comprises buffer capacitor; Two auxiliary IGBT collector electrodes of two buffering pressure units are all connected with buffer capacitor one end, between described buffer capacitor other end parallel connection access two diode cathodes, described two diode anodes all press branch road one end to be connected with the collector electrode of two main IGBT respectively by two resistance; Described buffer capacitor is in parallel with discharge resistance.This auxiliary buffering branch structure is simple, and it is convenient to realize.
Compared with prior art, the beneficial effect that the present invention has is: structure of the present invention is simple, and voltage transformer effectively can all press the sampling resistor in branch road and auxiliary IGBT by isolation resistance, avoids auxiliary IGBT on the impact of resistance sampling, thus improves sampling precision; And voltage follower/voltage comparator is added in the former limit of voltage transformer, sets reference voltage by resistance with coordinating of voltage comparator, then by high level output, lower to the required precision of voltage transformer; The public electric capacity of auxiliary buffering branch road of the present invention, when overvoltage is larger or larger overvoltage all appears in multiple auxiliary IGBT, auxiliary buffer capacitor can force the electric voltage equalization making series IGBT.
Accompanying drawing explanation
Fig. 1 is existing IGBT buffer circuit schematic diagram;
Fig. 2 is embodiment of the present invention circuit theory diagrams;
Fig. 3 is the embodiment of the present invention 2 circuit theory diagrams.
Embodiment
As shown in Figure 2, the embodiment of the present invention 1 comprises the first main IGBT
with the second main IGBT
, the first main IGBT
with the second main IGBT
series connection, two main IGBT cushion branch road with a RCD respectively, the 2nd RCD cushions branch circuit parallel connection; One RCD cushion branch road, the 2nd RCD cushion branch road respectively with by
,
;
,
two resistance be in series all press branch circuit parallel connection; Voltage follower
,
input accesses respectively
,
between,
,
between; Voltage follower
output,
one end respectively with voltage transformer M
1winding two ends, former limit connect; Voltage follower
output,
one end respectively with voltage transformer M
2winding two ends, former limit connect, voltage transformer M
1vice-side winding two ends are the auxiliary IGBT with first respectively
grid is connected with emitter, voltage transformer M
2vice-side winding two ends are the auxiliary IGBT with second respectively
grid is connected with emitter; First auxiliary IGBT
, the second auxiliary IGBT
emitter respectively with
,
one end connects; First auxiliary IGBT
, the second auxiliary IGBT
collector electrode all and buffer capacitor
one end connects; Buffer capacitor
other end parallel connection access diode
,
between negative electrode, diode
,
anode respectively with
,
one end connects; Buffer capacitor
with discharge resistance R
0in parallel.
Fig. 3 is another kind of embodiment of the present invention, wherein operational amplifier
,
as voltage comparator, the negative input end input reference voltage (threshold voltage) of voltage comparator.
Resistance R
x2, R
x3, voltage follower/voltage comparator
form voltage detecting circuit respectively, if the IGBT of series connection all presses effectiveness comparison desirable, when the overvoltage that IGBT collector electrode-emitter occurs is smaller, R
x2and R
x3as static voltage sharing (x=1,2), resistance
the threshold voltage V that the voltage detected sets lower than voltage comparator negative input end
rEF, thus
gate-emitter voltage will lower than threshold voltage, therefore C
0-R
0-D
x2the RCD buffer cell of composition is inoperative, and namely the work of auxiliary buffer cell is same as and only has C
x1-R
x1-D
x1the situation of the work that auxiliary buffer cell participates in.Because electric capacity C
x1value is less (to be less than
1/5 of value), thus the turn-off time of IGBT converter valve and power loss are also less, synchronously ideal thus voltage is unbalanced less for IGBT converter valve device signal under normal circumstances, less electric capacity is only needed to meet the demands, therefore the turn-off time under the present invention's normal operating conditions that can effectively reduce, thus reduce turn-off power loss.If IGBT all presses effect not to be very desirable, during the voltage that namely on certain main IGBT, appearance is larger (now on another IGBT, dividing potential drop is less, does not therefore need buffer capacitor participation work).Before any one IGBT collector emitter voltage does not also reach the overvoltage detection circuit reference value of setting, still only has C
x1-R
x1-D
x1auxiliary buffer cell work.C
0-R
0-D
x2the RCD buffer cell of composition is inoperative.When
or
collector emitter voltage reach the overvoltage reference value of setting,
on dividing potential drop exceed
threshold voltage, thus make corresponding auxiliary IGBT
conducting, C
x1-R
x1-D
x2and C
0-R
0-D
x2all participate in superpotential suppression as buffer cell, due to
(be greater than 5 comparatively greatly
), thus to the overvoltage produced, there is good inhibition.Diode D
x2prevent electric current backflow, R
0effect be discharge resistance as auxiliary buffer circuit electric capacity.
Voltage transformer M
1, M
2all pressed by resistance branch road and auxiliary IGBT to keep apart, thus effectively prevent the interference that auxiliary IGBT all presses branch road to sample to resistance, improve sampling precision; Voltage comparator is added in the former limit of voltage transformer, sets reference voltage by resistance with coordinating of voltage comparator, then by high level output, lower to the required precision of voltage transformer.
Share an auxiliary buffering branch road during the multiple main IGBT series connection of the present invention, namely share a buffer capacitor, two main IGBT series connection, if voltage distribution is uneven, the overvoltage on the main IGBT that this buffer capacitor over-voltage suppression is larger.But when multiple IGBT series connection, may exist on multiple main IGBT and occur superpotential situation, now occur that the auxiliary IGBT that superpotential main IGBT is corresponding can be in conducting state, thus make buffer capacitor be connected in parallel on multiple main IGBT, make the voltage of the superpotential main IGBT of appearance equal with capacitance voltage by force, reach the object of electric voltage equalization.
Claims (4)
1. load-side controls a series IGBT equalizer circuit, comprises the main IGBT of at least two series connection, it is characterized in that, each main IGBT cushions pressure unit be connected with one; Described buffering pressure unit comprises the RCD be connected in parallel between described main IGBT collector and emitter and cushions branch road; Described RCD cushions branch road and resistance all presses branch circuit parallel connection; Described resistance all presses branch road mid point to be connected with voltage follower/voltage comparator input; Described voltage follower/voltage comparator output, resistance all press branch road one end, and limit former in voltage transformer winding first input end, the second input are connected respectively; Described voltage transformer time winding two ends, limit are connected with the grid of auxiliary IGBT, emitter respectively; The emitter of described auxiliary IGBT is connected with voltage transformer former limit winding second input; The auxiliary IGBT collector electrode of all buffering pressure units all cushions branch road be connected with auxiliary; Described auxiliary buffering branch road all presses the branch road other end to be connected with described resistance.
2. load-side according to claim 1 controls series IGBT equalizer circuit, it is characterized in that, described main IGBT, buffering pressure unit quantity are two.
3. load-side according to claim 2 controls series IGBT equalizer circuit, and it is characterized in that, described auxiliary buffering branch road comprises buffer capacitor; Two auxiliary IGBT collector electrodes of two buffering pressure units are all connected with buffer capacitor one end, between described buffer capacitor other end parallel connection access two diode cathodes, described two diode anodes all press branch road one end to be connected with the collector electrode of two main IGBT respectively by two resistance; Described buffer capacitor is in parallel with discharge resistance; Described buffer capacitor capacitance is greater than 5
.
4. load-side according to claim 3 controls series IGBT equalizer circuit, it is characterized in that, the capacitor's capacity that described RCD cushions in branch road is less than 1/5 of described buffer capacitor capacitance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410759908.0A CN104362840A (en) | 2014-12-12 | 2014-12-12 | Load-side control series-connection IGBT (Insulated Gate Bipolar Translator) voltage-sharing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410759908.0A CN104362840A (en) | 2014-12-12 | 2014-12-12 | Load-side control series-connection IGBT (Insulated Gate Bipolar Translator) voltage-sharing circuit |
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| Publication Number | Publication Date |
|---|---|
| CN104362840A true CN104362840A (en) | 2015-02-18 |
Family
ID=52530076
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410759908.0A Pending CN104362840A (en) | 2014-12-12 | 2014-12-12 | Load-side control series-connection IGBT (Insulated Gate Bipolar Translator) voltage-sharing circuit |
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| CN (1) | CN104362840A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107194102A (en) * | 2017-06-05 | 2017-09-22 | 华北电力大学 | High pressure flexible direct current converter valve supports insulative substring joins voltage balancing method |
| CN111049365A (en) * | 2019-11-15 | 2020-04-21 | 深圳供电局有限公司 | IGBT series dynamic voltage-sharing control circuit and method |
Citations (6)
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|---|---|---|---|---|
| JP2000134910A (en) * | 1998-10-28 | 2000-05-12 | Meidensha Corp | Switching signal adjuster for semiconductor switch |
| CN202260996U (en) * | 2011-10-17 | 2012-05-30 | 湖州电力局 | Driving circuit of series-connection insulated gate bipolar transistor (IGBT) |
| CN202940722U (en) * | 2012-11-30 | 2013-05-15 | 南京南瑞继保电气有限公司 | Dynamic/static voltage-sharing circuit with voltage overshoot threshold limit for series connection of IGBTs |
| CN203039559U (en) * | 2013-01-14 | 2013-07-03 | 湖南大学 | Grid-clamped series-connection IGBT voltage equalizing circuit |
| CN203039562U (en) * | 2013-01-14 | 2013-07-03 | 湖南大学 | Series connection IGBT voltage-equalizing circuit based on grid control |
| CN204258603U (en) * | 2014-12-12 | 2015-04-08 | 中国电建集团中南勘测设计研究院有限公司 | A kind of load-side controls series IGBT equalizer circuit |
-
2014
- 2014-12-12 CN CN201410759908.0A patent/CN104362840A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000134910A (en) * | 1998-10-28 | 2000-05-12 | Meidensha Corp | Switching signal adjuster for semiconductor switch |
| CN202260996U (en) * | 2011-10-17 | 2012-05-30 | 湖州电力局 | Driving circuit of series-connection insulated gate bipolar transistor (IGBT) |
| CN202940722U (en) * | 2012-11-30 | 2013-05-15 | 南京南瑞继保电气有限公司 | Dynamic/static voltage-sharing circuit with voltage overshoot threshold limit for series connection of IGBTs |
| CN203039559U (en) * | 2013-01-14 | 2013-07-03 | 湖南大学 | Grid-clamped series-connection IGBT voltage equalizing circuit |
| CN203039562U (en) * | 2013-01-14 | 2013-07-03 | 湖南大学 | Series connection IGBT voltage-equalizing circuit based on grid control |
| CN204258603U (en) * | 2014-12-12 | 2015-04-08 | 中国电建集团中南勘测设计研究院有限公司 | A kind of load-side controls series IGBT equalizer circuit |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107194102A (en) * | 2017-06-05 | 2017-09-22 | 华北电力大学 | High pressure flexible direct current converter valve supports insulative substring joins voltage balancing method |
| CN107194102B (en) * | 2017-06-05 | 2020-08-21 | 华北电力大学 | Series voltage balancing method for high-voltage flexible direct-current converter valve supporting insulator |
| CN111049365A (en) * | 2019-11-15 | 2020-04-21 | 深圳供电局有限公司 | IGBT series dynamic voltage-sharing control circuit and method |
| CN111049365B (en) * | 2019-11-15 | 2021-06-04 | 深圳供电局有限公司 | IGBT series dynamic voltage-sharing control circuit and method |
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Application publication date: 20150218 |
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