CN204349776U - A kind of grid type IGBT series average-voltage circuit - Google Patents
A kind of grid type IGBT series average-voltage circuit Download PDFInfo
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- CN204349776U CN204349776U CN201420780811.3U CN201420780811U CN204349776U CN 204349776 U CN204349776 U CN 204349776U CN 201420780811 U CN201420780811 U CN 201420780811U CN 204349776 U CN204349776 U CN 204349776U
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Abstract
The utility model discloses a kind of grid type 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; Voltage detecting circuit comprises the resistance be connected in parallel between one of them 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 voltage comparator positive input terminal; Described voltage comparator output, resistance all press branch road one end to be connected at winding two ends, limit former in voltage transformer respectively; Voltage transformer time winding two ends, limit are connected with the grid of auxiliary IGBT, emitter respectively; The emitter of auxiliary IGBT is connected with the grid of described main IGBT; Described auxiliary IGBT collector electrode is connected with buffering branch road; Buffering branch road all presses the branch road other end to be connected with described main IGBT collector electrode by described resistance.The utility model improves circuit sampling precision, shortens circuit response time, simplifies circuit structure, improves circuit reliability and driving force.
Description
Technical field
The utility model relates to a kind of grid type 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 series average-voltage 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 values 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 type 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 type 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; Described voltage detecting circuit comprises the resistance be connected in parallel between one of them 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 voltage comparator positive input terminal; Described 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 the grid of described main IGBT; Described auxiliary IGBT collector electrode is connected with buffering branch road; Described buffering branch road all presses the branch road other end to be connected with described main IGBT collector electrode by described resistance; The negative input end input reference voltage of described voltage comparator.
Described main IGBT quantity is two; The emitter of first main IGBT is connected with the collector electrode of second main IGBT.
Described buffering branch road comprises buffer capacitor; Described buffer capacitor is connected with diode cathode, and described diode anode all presses branch road one end to be connected with corresponding main IGBT collector electrode by described resistance; Described buffer capacitor is in parallel with discharge resistance.This 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 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.
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 comprises two main IGBT
with
, static voltage sharing
with
, voltage follower op
x, voltage comparator
, voltage transformer M
x, 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,
two ends respectively with voltage follower op
xinput, voltage transformer M
xone end, former limit connects, voltage follower op
xoutput and voltage comparator
positive input terminal connect, REF
xoutput is connected on the voltage transformer former limit other end, auxiliary IGBT
grid and collector electrode be connected in parallel on M
xsecondary, buffer capacitor
with diode D
xbe connected on the collector electrode of main IGBT and auxiliary IGBT
collector electrode between,
be connected in parallel on buffer capacitor
two ends.
Resistance
with
static electric voltage equalization is regulated 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 voltage comparator REF
xthe reference voltage of setting, voltage comparator REF
xthe high level exported makes auxiliary IGBT by voltage transformer
conducting, now buffer 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 static state voltage equipoise branch road and
the effect of grid, emitter.In order to prevent the load of voltage transformer secondary on the impact of former limit sampled signal, a voltage follower is increased at the secondary of voltage transformer, voltage follower plays the effect of intensifier circuit driving force simultaneously, can assist IGBT by fast conducting when IGBT is assisted in needs conducting.During in order to prevent conducting, buffer capacitor is on the impact of ON time, adds diode
.
effect be buffer capacitor
there is provided a discharge loop, buffer capacitor
energy should pass through in one-period
consume, allow
prepare for joining Overvoltage suppressing next time.
Claims (3)
1. a grid type 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, described voltage detecting circuit comprises the resistance be connected in parallel between one of them 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 voltage comparator positive input terminal; Described 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 the grid of described main IGBT; Described auxiliary IGBT collector electrode is connected with buffering branch road; Described buffering branch road all presses the branch road other end to be connected with described main IGBT collector electrode by described resistance; The negative input end input reference voltage of described voltage comparator.
2. grid type IGBT series average-voltage circuit according to claim 1, is characterized in that, described main IGBT quantity is two; The emitter of first main IGBT is connected with the collector electrode of second main IGBT.
3. grid type IGBT series average-voltage circuit according to claim 2, it is characterized in that, described buffering branch road comprises buffer capacitor; Described buffer capacitor is connected with diode cathode, and described diode anode all presses branch road one end to be connected with corresponding main IGBT collector electrode by described resistance; Described buffer capacitor is in parallel with discharge resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420780811.3U CN204349776U (en) | 2014-12-12 | 2014-12-12 | A kind of grid type IGBT series average-voltage circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420780811.3U CN204349776U (en) | 2014-12-12 | 2014-12-12 | A kind of grid type IGBT series average-voltage circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204349776U true CN204349776U (en) | 2015-05-20 |
Family
ID=53233016
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420780811.3U Active CN204349776U (en) | 2014-12-12 | 2014-12-12 | A kind of grid type IGBT series average-voltage circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204349776U (en) |
-
2014
- 2014-12-12 CN CN201420780811.3U patent/CN204349776U/en active Active
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|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |