CN204316306U - A kind of grid clamping IGBT series average-voltage circuit - Google Patents
A kind of grid clamping IGBT series average-voltage circuit Download PDFInfo
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- CN204316306U CN204316306U CN201420780749.8U CN201420780749U CN204316306U CN 204316306 U CN204316306 U CN 204316306U CN 201420780749 U CN201420780749 U CN 201420780749U CN 204316306 U CN204316306 U CN 204316306U
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Abstract
The utility model discloses a kind of grid clamping IGBT series average-voltage circuit, comprise the main IGBT of at least two series connection, each main IGBT is connected with a voltage detecting circuit; Each voltage detecting circuit comprises the resistance be connected in parallel between main IGBT collector and emitter and all presses branch road; Described resistance all presses branch road mid point to be connected with voltage follower input; Described voltage follower output is connected with winding one end, voltage transformer former limit, and described resistance all presses branch road one end to be connected with the described voltage transformer former limit winding other end; Described voltage transformer vice-side winding two ends are connected with the emitter of voltage comparator positive input terminal, auxiliary IGBT respectively; Described voltage comparator output is connected with the grid of described auxiliary IGBT; The collector electrode of described auxiliary IGBT cushions branch road be connected with auxiliary; Described auxiliary buffering branch road all presses the branch road other end to be connected with described main IGBT collector electrode by described resistance.Circuit sampling precision of the present utility model is high, and the response time is short, and structure is simple, and reliability is high, and driving force is strong.
Description
Technical field
The utility model relates to a kind of grid clamping IGBT series average-voltage 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.
At present, a lot of to the research of IGBT cascaded structure both at home and abroad, be mainly divided into load-side to control and grid control two large classes.Load-side controls to refer to when IGBT load side voltage is unbalanced, directly carries out regulating and controlling in load-side i.e. collector electrode-emitter.Grid controls to refer to when occurring that voltage is unbalanced, by regulating the equilibrium of control IGBT voltage to the grid of IGBT.Control for IGBT series average-voltage, when adopting load-side control method, the marquis when occurring that overvoltage is larger, because the absorption energy of IGBT two ends electric capacity is different, to the both end voltage of IGBT be caused unbalanced comparatively large, it is longer that load-side controls the turn-off time, and thus loss is larger.In the method that IGBT series connection controls, relatively many for grid-controlled research both at home and abroad, but the general gate control method response delay time is longer, and circuit is comparatively complicated, or may cause concussion.
Fig. 1 is shown in by the existing IGBT buffer circuit solved the problem, its defect is when carrying out Overvoltage suppressing, the sampled voltage of divider resistance compares with the threshold voltage of auxiliary IGBT, if sampled voltage is higher than the threshold voltage of auxiliary IGBT, IGBT is assisted with regard to conducting, because the threshold voltage of each IGBT produced is not quite identical, there is certain fluctuation, therefore each group IGBT connected will measure the threshold value of auxiliary IGBT, then determine sampling resistor value by threshold values, which increase quantities and be also not suitable for batch production simultaneously.And the temperature of same IGBT work is different with electric current, threshold voltage is not identical yet, and sampling therefore can be caused inaccurate.
Summary of the invention
Technical problem to be solved in the utility model is, for above-mentioned the deficiencies in the prior art, provides a kind of grid clamping IGBT series average-voltage circuit, improves circuit sampling precision, makes circuit be applicable to batch production.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is: a kind of grid clamping IGBT series average-voltage circuit, and comprise the main IGBT of at least two series connection, each main IGBT is connected with a voltage detecting circuit; Each voltage detecting circuit comprises the resistance be connected in parallel between main IGBT collector and emitter and all presses branch road; Described resistance all presses branch road mid point to be connected with voltage follower/voltage comparator input; Described voltage follower/voltage comparator output is connected with winding one end, voltage transformer former limit, and described resistance all presses branch road one end to be connected with the described voltage transformer former limit winding other end; Described voltage transformer vice-side winding two ends are connected with the source electrode of the emitter/metal-oxide-semiconductor of voltage comparator positive input terminal, auxiliary IGBT respectively; Described voltage follower/voltage comparator output is connected with the grid of the grid/metal-oxide-semiconductor of described auxiliary IGBT; The drain electrode of the collector electrode/metal-oxide-semiconductor of described auxiliary IGBT cushions branch road be connected with auxiliary; Described auxiliary buffering branch road all presses the branch road other end to be connected with described main IGBT collector electrode by described resistance; The source electrode of the emitter/metal-oxide-semiconductor of described auxiliary IGBT is connected with the grid of described main IGBT; The negative input end input reference voltage of described voltage comparator.
Described main IGBT quantity is two, and the emitter of the first main IGBT is connected with the collector electrode of the second main IGBT.
Described auxiliary buffering branch road comprises buffer capacitor, and described buffer capacitor is connected with diode cathode, and described diode anode is connected with corresponding main IGBT collector electrode to all being pressed branch road one end by described resistance; Described buffer capacitor is in parallel with discharge resistance.This auxiliary buffering branch structure is simple, and diode can prevent electric current reverse, and when preventing conducting, buffer capacitor is on the impact of ON time; Discharge resistance can the energy of buffer release electric capacity, allows buffer capacitor be participate in Overvoltage suppressing to prepare next time.
Compared with prior art, the beneficial effect that the utility model has is: the utility model structure is simple, when carrying out Overvoltage suppressing, the employing voltage of divider resistance and the negative input voltage of voltage comparator are compared, if there is overvoltage, the positive input terminal voltage of voltage comparator will be greater than negative input end voltage, exporting high level and make auxiliary IGBT conducting, therefore without the need to measuring the threshold value of the auxiliary IGBT of each group, decreasing quantities, be applicable to batch production, improve sample precision; Voltage comparator is added in voltage transformer vice-side winding, and the former vice-side winding voltage ratio of the first regulation voltage instrument transformer of energy carries out voltage compare again, thus more easily by sampling resistor setting reference voltage; Voltage follower can prevent the load of voltage transformer secondary on the impact of former limit sampled signal, the driving force of intensifier circuit; The reference voltage set by voltage comparator determines overvoltage when auxiliary IGBT participation conducting, makes the overvoltage of auxiliary IGBT participation conducting more accurate.
Accompanying drawing explanation
Fig. 1 is existing IGBT buffer circuit schematic diagram;
Fig. 2 is the utility model embodiment circuit theory diagrams.
Embodiment
As shown in Figure 2, the utility model embodiment 1 comprises two main IGBT Z
1and Z
2, static voltage sharing
with
, voltage follower
, voltage transformer M
x, voltage comparator
, auxiliary IGBT
, auxiliary capacitor
, discharge resistance
, diode D
x.Static voltage sharing
the resistance be in series all press branch road and
the resistance be in series all presses branch road to be connected in parallel between the collector electrode-emitter of two main IGBT respectively,
be connected in parallel on voltage transformer M
xformer limit, voltage follower
be connected on voltage transformer M
xone end, former limit
between one end, voltage transformer M
xsecondary two ends respectively with voltage comparator
, auxiliary auxiliary IGBT
grid connect, auxiliary capacitor
and diode
be connected on the collector electrode of main IGBT and auxiliary IGBT
collector electrode between,
be connected in parallel on auxiliary capacitor
two ends, wherein
.
Resistance
with
connect and regulate the electric voltage equalization of static state as static voltage sharing.Resistance
as voltage detection resistances, when no matter which kind of reason cause the voltage on certain main IGBT to exceed main IGBT sets when bearing voltage,
on voltage will exceed the reference voltage of voltage comparator, IGBT is assisted in the conducting of voltage comparator output HIGH voltage
, now auxiliary capacitor
regulate the electric voltage equalization of IGBT, thus reach the object that the main IGBT of series connection all presses.Wherein the effect of voltage transformer comprises following several aspect: make resistance equalizer circuit not affect the setting of the normal turn-off voltage of main IGBT, can also play in addition isolation resistance all press branch road and
the effect of grid, emitter.Determined the overvoltage of IGBT by the sampled voltage of voltage comparator, accuracy and reliability will be higher.In order to prevent the load of voltage transformer secondary on the impact of former limit sampled signal, increase a voltage follower at the secondary of voltage transformer, voltage follower can play the effect strengthening driving force.The reference voltage set by voltage comparator determines overvoltage when auxiliary IGBT participation conducting, makes the overvoltage of auxiliary IGBT participation conducting more accurate.During in order to prevent conducting, auxiliary capacitor is on the impact of ON time, adds diode
, diode simultaneously
prevent electric current reverse.
effect be electric capacity
there is provided a discharge loop, electric capacity
energy should pass through in one-period
consume, allow electric capacity
prepare for participating in Overvoltage suppressing next time.
Voltage transformer M
1, M
2all pressed by resistance branch road and voltage comparator to keep apart, thus effectively prevent voltage follower and interference that auxiliary IGBT all presses branch road to sample to resistance, improve sampling precision; Voltage comparator is added in voltage transformer vice-side winding, and the former vice-side winding voltage ratio of the first regulation voltage instrument transformer of energy carries out voltage compare again, thus more easily by resistance setting reference voltage, makes the overvoltage of auxiliary IGBT participation conducting more accurate.
Claims (3)
1. a grid clamping IGBT series average-voltage circuit, comprise the main IGBT of at least two series connection, each main IGBT is connected with a voltage detecting circuit; It is characterized in that, each voltage detecting circuit comprises the resistance be connected in parallel between main IGBT collector and emitter and all presses branch road; Described resistance all presses branch road mid point to be connected with voltage follower/voltage comparator input; Described voltage follower/voltage comparator output is connected with winding one end, voltage transformer former limit, and described resistance all presses branch road one end to be connected with the described voltage transformer former limit winding other end; Described voltage transformer vice-side winding two ends are connected with the source electrode of the emitter/metal-oxide-semiconductor of voltage comparator positive input terminal, auxiliary IGBT respectively; Described voltage follower/voltage comparator output is connected with the grid of the grid/metal-oxide-semiconductor of described auxiliary IGBT; The drain electrode of the collector electrode/metal-oxide-semiconductor of described auxiliary IGBT cushions branch road be connected with auxiliary; Described auxiliary buffering branch road all presses the branch road other end to be connected with described main IGBT collector electrode by described resistance; The source electrode of the emitter/metal-oxide-semiconductor of described auxiliary IGBT is connected with the grid of described main IGBT; The negative input end input reference voltage of described voltage comparator.
2. grid clamping IGBT series average-voltage circuit according to claim 1, is characterized in that, described main IGBT quantity is two, and the emitter of the first main IGBT is connected with the collector electrode of the second main IGBT.
3. grid clamping IGBT series average-voltage circuit according to claim 2, it is characterized in that, described auxiliary buffering branch road comprises buffer capacitor, described buffer capacitor is connected with diode cathode, and described diode anode is connected with corresponding main IGBT collector electrode to all being pressed branch road one end by described resistance; Described buffer capacitor is in parallel with discharge resistance.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420780749.8U CN204316306U (en) | 2014-12-12 | 2014-12-12 | A kind of grid clamping IGBT series average-voltage circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420780749.8U CN204316306U (en) | 2014-12-12 | 2014-12-12 | A kind of grid clamping IGBT series average-voltage circuit |
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| Publication Number | Publication Date |
|---|---|
| CN204316306U true CN204316306U (en) | 2015-05-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420780749.8U Active CN204316306U (en) | 2014-12-12 | 2014-12-12 | A kind of grid clamping IGBT series average-voltage circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109302076A (en) * | 2018-11-02 | 2019-02-01 | 杰华特微电子（杭州）有限公司 | Detection circuit and method, ON-OFF control circuit and inverse-excitation converting circuit |
-
2014
- 2014-12-12 CN CN201420780749.8U patent/CN204316306U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109302076A (en) * | 2018-11-02 | 2019-02-01 | 杰华特微电子（杭州）有限公司 | Detection circuit and method, ON-OFF control circuit and inverse-excitation converting circuit |
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| GR01 | Patent grant |