CN107565802A - A kind of flow equalizing circuit for high-power parallel IGBT module - Google Patents
A kind of flow equalizing circuit for high-power parallel IGBT module Download PDFInfo
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- CN107565802A CN107565802A CN201710739728.XA CN201710739728A CN107565802A CN 107565802 A CN107565802 A CN 107565802A CN 201710739728 A CN201710739728 A CN 201710739728A CN 107565802 A CN107565802 A CN 107565802A
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Abstract
The invention discloses a kind of flow equalizing circuit for high-power parallel IGBT module, the circuit includes controller and multiple sharing control branch roads being connected in parallel, and the sharing control branch road includes the first current detection circuit, the second current detection circuit, the first drive circuit, the second drive circuit, transformer T；First current detection circuit, the second current detection circuit detect the output current of the first IGBT module and the second IGBT module respectively, two-way detection electric current is obtained to send to controller, the size that controller detects electric current according to two-way produces two path control signal, the two path control signal is respectively after the first drive circuit and the driving of the second drive circuit, send to transformer T, grids of the transformer T by its synchronism output to the first IGBT module and the second IGBT module.The circuit solves the unbalanced problem of dynamic current equalizing under the Current for paralleled and on off state under conducting state while control driver cost is not significantly increased.
Description
Technical field
The present invention relates to a kind of flow equalizing circuit for high-power parallel IGBT module, control driver be not significantly increased
While cost, realize more high-power, can be applied to high-power, high current high capacity environment.Belong to large power high efficiency energy work(
Rate converter technique field.
Background technology
Maturation and development with IGBT technologies, and IGBT pressure-resistant and through-current capability are constantly strengthened, and IGBT turns into big
The first choice of power wholly-controled device, but in relatively high power application, single IGBT capacity still can not meet to require, in order to
The power grade of power electronic equipment is improved, it is necessary to which multiple IGBT parallel connection improves capacity.
IGBT module parallel is used while its ability to bear to electric current is improved, and also faces the problem of some are new：
Due to the influence of the factors such as the otherness of each parallel IGBT module, hardware circuit and PCB layout, can cause each
Electric current between IGBT has differences, and the dynamic current equalizing under Current for paralleled and on off state under generation conducting state is unbalanced to ask
Topic.
Existing IGBT parallel current-equalizing circuits are largely passively to flow mode, i.e., the drive signal in each loop in parallel is
Share, reach according to itself control characteristic of power device and corresponding circuit and flow effect, but due to the saturation of power device
Conduction voltage drop VCE(set)With equivalent emitter-base bandgap grading inductance L difference, and grid capacitance C in circuit design processGE, resistance Rg, grid
Pole lead-in inductance LgDeng otherness, can cause the problem of electric current distribution is uneven occur during the in parallel application of device, when serious, due to
The asynchronous priority conducting that can cause two branch roads of the driving pulse of parallel IGBT, the IGBT that driving pulse shifts to an earlier date preferentially turn on production
Raw high current, can burn component can make relevant parallel power device IGBT overload and damage.
, there are saturation conduction pressure drop VCE (sat) and equivalent emitter-base bandgap grading inductance L difference the reason for causing static uneven stream；Cause
The reason for dynamic inequality stream is due to that external drive circuit influences to cause device to open the Time Inconsistency with shut-off, external circuit
Comprising dynamic factor have：Grid capacitance CGE, resistance Rg, grid lead inductance Lg, Miller capacitance CGC, threshold voltage
Vth, emitter inductance Le, bus inductance Lm, outputting inductance Lo etc..
Current equalizing method main at present is divided into Current for paralleled method and dynamic current equalizing method.
The dynamic current equalizing method generally used at present is resistance Compensation Design, adjustable by being installed additional in gate output terminal
Resistance R compensates grid resistance value so as to change the time of IGBT on-delay and turn-off delay, in parallel for two-way IGBT
Opening process increases its conducting and prolonged, it is necessary to the resistance resistance compensated in the driving circuit for opening fast IGBT module increasing
Late, realize two-way drive signal synchronous, improve its dynamic current equalizing；But resistance Compensation Design is generally adjusted well
Electric current flows effect when realizing IGBT parallel connection dynamic current balance problems, but closing in IGBT, be disconnected does not improve well.
In addition, the static uneven flow problem of parallel IGBT can mainly be led by DC loop bus with the asymmetry for exchanging output
Cause shunt circuit substitutional resistance different, and different IGBT module collection emitter-base bandgap grading saturation conduction pressure drop UCE(SET)Differing causes, mesh
It is preceding that generally it moderately drops volume by the way of the isometric layout of PCB circuits, the IGBT device consistent from characterisitic parameter, and by IGBT
Use, quiescent current degree of unbalancedness is limited in permissible range.But this method is static uneven without fundamentally solving
Flow problem.
The content of the invention
The technology of the present invention solves problem：Overcome the deficiencies in the prior art, there is provided one kind is used for high-power parallel IGBT
The flow equalizing circuit of module, while control driver cost is not significantly increased, the static state efficiently solved under conducting state is equal
The unbalanced problem of dynamic current equalizing under stream and on off state, produce more high-power current signal.
The present invention technical solution be：A kind of flow equalizing circuit for high-power parallel IGBT module, this flows electricity
Road includes controller and N number of sharing control branch road being connected in parallel, N >=1, and each sharing control branch road is used to control therewith
The first IGBT module and the second IGBT module being connected in parallel, the sharing control branch road include the first current detection circuit, the
Two current detection circuits, the first drive circuit, the second drive circuit, transformer T；First current detection circuit, the inspection of the second electric current
Survey time, road detected the output current of the first IGBT module and the second IGBT module respectively, obtains two-way detection electric current and sends to control
Device, the size that controller detects electric current according to two-way produce two path control signal, and the two path control signal is driven through first respectively
After dynamic circuit and the second drive circuit driving, send to transformer T Same Name of Ends, transformer T is by the first drive circuit and the
The signal of two drive circuits output is synchronous, exports the grid to the first IGBT module and the second IGBT module so that the first IGBT
Module and the second IGBT module signal are synchronous, and the first IGBT module and the output of the second IGBT module are synchronous, and two-way output is folded
Add and produce high-power current signal, N number of sharing control branch current being connected in parallel is superimposed again produces more high-power current signal.
The control signal is the adjustable square-wave signal of dutycycle, and controller calculates being averaged for two-way output current in real time
Value, two-way is detected into electric current respectively compared with the current average, when detection electric current is more than average current, reduce inspection
The control signal dutycycle of branch road where surveying electric current；When detection electric current is less than average current, branch road where increase detection electric current
Control signal dutycycle, will detect electric current be more than current average branch road corresponding to IGBT module output signal duty
Than reducing, detection electric current is less than the output signal dutycycle increase of the IGBT module corresponding to the branch road of average value.
It is relative with Same Name of Ends that the flow equalizing circuit also includes first grid resistance R1, second grid resistance R2, transformer T
Two end points of opposite side are connected to the first IGBT module and second by first grid resistance R1, second grid resistance R2 respectively
The grid of IGBT module, by change first grid resistance R1, second grid resistance R2 resistances come adjust the first IGBT module and
The on-delay of second IGBT module and the time of turn-off delay.
Specifically adjusting method is：The resistance resistance of compensation is increased in the driving circuit for opening fast IGBT module,
Increase its on-delay；Reduce the resistance resistance of compensation in the driving circuit for opening slow IGBT module, reduce its conducting
Delay so that the first IGBT module is consistent with the second IGBT module switching delay, and output signal is synchronous.
The source electrode of first IGBT module and the second IGBT module and the absolute value of the difference of drain electrode saturation conduction pressure drop exist
Within 0.5V.
The power power-supply common source design of N number of sharing control branch road.
First IGBT module of all sharing control branch roads and the second IGBT module source electrode are powered using stack bus bar mode.
Each sharing control branch road also includes the first temperature detection loop, second temperature measure loop, detection in real time
The temperature of first IGBT module and the second IGBT module, sends it to controller, when the temperature of any IGBT module exceedes in advance
If during temperature threshold, controller closes the control signal of respective branch.
The preset temperature threshold value is more than or equal to 100 DEG C.
Compared with the prior art, the invention has the advantages that：
(1), the present invention adjusts the uniformity of drive signal by transformer magnetic coupling mode, is believed by the driving after synchronization
Number driving IGBT patterns in parallel, realize the synchronism of module output signal, and real-time synchronization effect is good；
(2), the present invention in transformer rear end adds resistance resistance, adjust parallel connection IGBT module on-delay and
The time of turn-off delay, improve its dynamic current equalizing.
(3), the present invention detects output current in real time by measure loop, according to testing result active accommodation drive signal
Dutycycle, realize Current for paralleled；
(4), the power power-supply V of the N number of sharing control branch road of the present inventiondcCommon source designs, and all IGB module source electrodes in parallel are equal
Powered using stack bus bar mode, reduce each branch road power supply difference, reduce stray inductance in maximum magnitude, reduce IGBT due to closing
Voltage change ratio caused by disconnected, improve internal electromagnetic environment, reduce due to interference caused by switching effect；
(5), the present invention is monitored to shunt circuit temperature simultaneously, cuts off drive signal during excess temperature, is not reduced as far as possible
In the case of systematic function, ensure the safety of system operation.
Brief description of the drawings
Fig. 1 is the flow equalizing circuit structure that the embodiment of the present invention is used for high-power parallel IGBT module；
Fig. 2 is parallel IGBT grid voltage closed loop control schematic diagram of the embodiment of the present invention.
Fig. 3 is stack bus bar mode electrical schematic of the embodiment of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
The present invention flows to solve the problems, such as that parallel IGBT is static and dynamic is uneven, there is provided one kind is used for high-power parallel connection
The flow equalizing circuit of IGBT module, from balanced three aspects of Current for paralleled design, dynamic current equalizing design and power supply, solve it is static and
Dynamic current equalizing problem.
As shown in figure 1, a kind of flow equalizing circuit for high-power parallel IGBT module, including controller and N number of parallel connection are even
The sharing control branch road connect, N >=1, each sharing control branch road are used to controlling the first IGBT module for being connected in parallel and the
Two IGBT modules, N number of sharing control branch current being connected in parallel is superimposed again produces more high-power current signal.
As shown in Fig. 2 each sharing control branch road includes the first current detection circuit, the second current detection circuit, first
Drive circuit, the second drive circuit, transformer T, first grid resistance R1, second grid resistance R2；First current detection circuit,
Second current detection circuit detects the output current of the first IGBT module and the second IGBT module by current sensor respectively, obtains
Sent to two-way detection electric current to controller, controller calculates the average current of two-way in real time, and it is defeated that controller calculates two-way in real time
Go out the average value of electric current, two-way is detected into electric current respectively compared with the current average, according to comparative result, produced respectively
Raw two path control signal, the control signal is the adjustable square-wave signal of dutycycle, when detection electric current is more than average current, is subtracted
The control signal dutycycle of branch road where small detection electric current；When detection electric current is less than average current, where increase detection electric current
The control signal dutycycle of branch road, the output that electric current is more than the IGBT module corresponding to the branch road of circuit average value is most detected at last
Signal dutyfactor reduces, and detection electric current is less than the output signal dutycycle increase of the IGBT module corresponding to the branch road of average value.
Two path control signal is sent to transformer T Same Name of Ends, transformer after the first drive circuit and the driving of the second drive circuit
Two end points of opposite side relative with Same Name of Ends T are connected to first by first grid resistance R1, second grid resistance R2 respectively
The grid of IGBT module and the second IGBT module, by changing first grid resistance R1, second grid resistance R2 resistances are adjusted
The time of the on-delay and turn-off delay of first IGBT module and the second IGBT module, specific price adjustment method are：Open-minded
The driving circuit of fast IGBT module increases the resistance resistance of compensation, increases its on-delay；Opening slow IGBT moulds
The driving circuit of block reduces the resistance resistance of compensation, reduces its on-delay so that the first IGBT module and the 2nd IGBT
Module switch delay is consistent, and output signal is synchronous, and two-way output superposition produces high-power current signal.Oscillography is used in test process
Device tracks the drive signal waveform and the drive signal that sends of controller of two branch roads output, whether has delay during contrast, for
Hysteresis controller sends the branch road of drive signal, is judged as opening slowly.
First drive circuit and the second drive circuit include regulating circuit and drive amplification circuit, regulating circuit are used for
The voltage of control signal is adjusted to the input voltage needed for drive amplification circuit, drive amplification circuit is amplified.
Each sharing control branch road also includes the first temperature detection loop, the second measure loop, detects first in real time
The temperature of IGBT module and the second IGBT module, sends it to controller, when the temperature of any IGBT module exceedes default temperature
When spending threshold value, controller closes the control signal of respective branch, and it is low level to make its constant.The preset temperature threshold value be more than etc.
In 100 DEG C.
Parallel IGBT grid voltage closed loop independent control flow, as shown in Figure 2.High-power current output signal Q generation
It is made up of N number of sharing control branch circuit parallel connection, each sharing control branch road there are each independent control signal Qi drivings, and Qi is by controlling
Device processed directly produces.Include independent temperature acquisition and current acquisition passage in each sharing control branch road, collect
Coherent signal is directly inputted to controller.The coherent signal that controller gathers according to each current sharing control branch road, to entirely simultaneously
Join sharing control loop and carry out system monitoring, when excess temperature, excessively stream occur for some sharing control branch road, Mobile state can be entered in time
Adjustment, the independent size for adjusting each sharing control branch road control signal Qi, in the case where not reducing systematic function as far as possible, ensure
The safety of system operation.
Controller can also be according to system conditions, and dynamic adjusts the control signal of shunt circuit, and alternating opens part
Sharing control branch road, reach the purpose of protection hardware circuit and IGBT power module to a certain extent.
As shown in figure 3, in order to shorten the power supply difference of IGBT in each driving shunt circuit, N number of sharing control branch as far as possible
The power power-supply common source design on road, the first IGBT module of all sharing control branch roads and the second IGBT module source electrode use lamination
Busbar mode is powered.It can better profit from controlling actuator housing to be driven the design of module compact formula, at the same time, use
Stack bus bar designs the connection of each drive module, and cabling shortens as far as possible, and stray inductance is reduced in maximum magnitude, reduce IGBT due to
Voltage change ratio caused by shut-off, improve internal electromagnetic environment, reduce due to interference caused by switching effect.
The present invention solves the problems, such as that parallel IGBT is static and the uneven stream of dynamic from following many-side：
(1), each parallel IGBT driving circuit is fastenedly connected with stack bus bar as shown in Figure 3, each branch road is reduced and supplies
Electric difference.
(2), the control signal sent by controller passes through the front end transformer T of drive circuit as shown in Figure 1, passes through
Magnetic-coupled mode adjusts the uniformity of control signal, realizes the synchronism at module switch moment.
(3), the control signal after transformer T processing between each parallel IGBT control signal input by installing additional
The compensation resistance R of grid as shown in fig. 1, reach balanced to adjust parallel IGBT dynamic current in whole switch periods.The party
Method reliability is high, realizes the dynamic control to parallel branch and protection.
(4), the control signal handled by dynamic equalization independently drives each IGBT module, by electric current as shown in Figure 2
Sensor detects the size of current that each branch road IGBT in parallel is flowed through in collection respectively, and collection signal is input into controller in Fig. 2, controlled
Device calculating current average value processed, the current feedback that each branch road is sampled is to controller compared with average current.
(5) if, a certain parallel branch current feedback values be less than average current calculate value more than 5A when, monitoring IGBT temperature
Whether threshold value is exceeded, if IGBT temperature leads to the difference between the value of feedback and average current value not less than the threshold value of setting
The voltage difference that demarcation is converted into grid is crossed, the parallel branch control signal is increased, lifts this parallel branch output current；If
This IGBT temperature exceedes the threshold value of setting, then closes down the parallel branch, after IGBT temperature is normal, reopens this parallel connection branch
Road, if temperature occurs exception again or current feedback values exceed controller given threshold, judge that this parallel branch is damaged, cut off this
Branch road simultaneously reports abnormal information to control unit.
(6) if, a certain parallel branch current feedback values be more than average current calculate value more than 5A when, judge the parallel connection branch
Whether road current feedback values exceed controller given threshold, if current feedback values, within given threshold, monitoring IGBT temperature is
It is no to exceed given threshold, if the difference between the value of feedback and average current value is passed through mark by IGBT temperature not less than threshold value
Surely the voltage difference for being converted into grid reduces parallel branch control signal to reduce output current；If this IGBT temperature exceedes threshold
Value, then close down the parallel branch, after IGBT temperature is normal, reopen this parallel branch, if temperature still exceedes threshold value,
Judge that this parallel branch is damaged, cut off this branch road and to controller report exceptional instructions；If parallel branch current feedback values exceed
Given threshold, then close down the parallel branch and report abnormal information to control unit.
It is not described in detail in this specification and partly belongs to general knowledge as well known to those skilled in the art.
Claims (9)
- A kind of 1. flow equalizing circuit for high-power parallel IGBT module, it is characterised in that：Including controller and N number of it is connected in parallel Sharing control branch road, N >=1, each sharing control branch road be used to controlling the first IGBT module for being connected in parallel therewith and Second IGBT module, the sharing control branch road include the first current detection circuit, the second current detection circuit, the first driving electricity Road, the second drive circuit, transformer T；First current detection circuit, the second current detection circuit detect the first IGBT module respectively With the output current of the second IGBT module, obtain two-way detection electric current and send to controller, controller is according to two-way detection electric current Size produce two path control signal, the two path control signal drives it through the first drive circuit and the second drive circuit respectively Afterwards, send to transformer T Same Name of Ends, the signal that transformer T exports the first drive circuit and the second drive circuit is synchronous, defeated Go out the grid to the first IGBT module and the second IGBT module so that the first IGBT module and the second IGBT module signal are same Step, the first IGBT module and the output of the second IGBT module are synchronous, and two-way output superposition produces high-power current signal, N number of parallel connection The sharing control branch current of connection is superimposed again produces more high-power current signal.
- A kind of 2. flow equalizing circuit for high-power parallel IGBT module according to claim, it is characterised in that the control Signal processed is the adjustable square-wave signal of dutycycle, and controller calculates the average value of two-way output current in real time, and two-way is detected into electricity Stream compared with the current average, when detection electric current is more than average current, reduces branch road where detection electric current respectively Control signal dutycycle；When detection electric current is less than average current, the control signal duty of branch road where increase detection electric current Than, output signal dutycycle of the electric current more than the IGBT module corresponding to the branch road of current average will be detected and reduced, detection electricity Output signal dutycycle increase of the stream less than the IGBT module corresponding to the branch road of average value.
- 3. a kind of flow equalizing circuit for high-power parallel IGBT module according to claim, it is characterised in that also include Two end points of opposite side first grid resistance R1, second grid resistance R2, transformer T relative with Same Name of Ends pass through first respectively Resistance R1, second grid resistance R2 are connected to the grid of the first IGBT module and the second IGBT module, by changing first Resistance R1, second grid resistance R2 resistances adjust the on-delay of the first IGBT module and the second IGBT module and shut-off The time of delay.
- 4. a kind of flow equalizing circuit for high-power parallel IGBT module according to claim 3, it is characterised in that specific Adjusting method be：The resistance resistance of compensation is increased in the driving circuit for opening fast IGBT module, increases its conducting and prolongs Late；Reduce the resistance resistance of compensation in the driving circuit for opening slow IGBT module, reduce its on-delay so that first IGBT module is consistent with the second IGBT module switching delay, and output signal is synchronous.
- 5. a kind of flow equalizing circuit for high-power parallel IGBT module according to claim 1, it is characterised in that described The source electrode of first IGBT module and the second IGBT module and the absolute value of the difference of drain electrode saturation conduction pressure drop are within 0.5V.
- 6. a kind of flow equalizing circuit for high-power parallel IGBT module according to claim 1, it is characterised in that N number of equal The power power-supply common source design of flow control branch road.
- 7. a kind of flow equalizing circuit for high-power parallel IGBT module according to claim 1, it is characterised in that all First IGBT module of sharing control branch road and the second IGBT module source electrode are powered using stack bus bar mode.
- 8. a kind of flow equalizing circuit for high-power parallel IGBT module according to claim, it is characterised in that described every Individual sharing control branch road also include the first temperature detection loop, second temperature measure loop, in real time detect the first IGBT module and The temperature of second IGBT module, sends it to controller, when the temperature of any IGBT module exceedes preset temperature threshold value, control Device processed closes the control signal of respective branch.
- 9. a kind of flow equalizing circuit for high-power parallel IGBT module according to claim, it is characterised in that described pre- If temperature threshold is more than or equal to 100 DEG C.
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| CN108429434A (en) * | 2018-02-06 | 2018-08-21 | 创驱（上海）新能源科技有限公司 | A method of realizing real-time dynamic current equalizing between at least two power components |
| CN108964427A (en) * | 2018-06-29 | 2018-12-07 | 西安翌飞核能装备股份有限公司 | A kind of driving circuit and its working method of high-power converter semiconductor devices |
| CN110299825A (en) * | 2018-03-22 | 2019-10-01 | 维谛技术有限公司 | A kind of switching device parallel current-sharing system |
| CN110401432A (en) * | 2018-04-24 | 2019-11-01 | 株式会社东芝 | Control circuit and power module |
| CN110518784A (en) * | 2019-07-19 | 2019-11-29 | 杭州洲钜电子科技有限公司 | Power MOSFET parallel current-equalizing circuit in a kind of inverter |
| CN110661405A (en) * | 2019-09-29 | 2020-01-07 | 苏州浪潮智能科技有限公司 | Load protection circuit |
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| CN112003460A (en) * | 2020-09-07 | 2020-11-27 | 苏州乾能电气有限公司 | Current equalizing method of IGBT parallel circuit and IGBT parallel circuit |
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| CN112713751A (en) * | 2020-12-21 | 2021-04-27 | 中车永济电机有限公司 | High-voltage electrical connection method and structure based on high-power IGBT parallel connection |
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| CN108429434A (en) * | 2018-02-06 | 2018-08-21 | 创驱（上海）新能源科技有限公司 | A method of realizing real-time dynamic current equalizing between at least two power components |
| CN110299825A (en) * | 2018-03-22 | 2019-10-01 | 维谛技术有限公司 | A kind of switching device parallel current-sharing system |
| CN110299825B (en) * | 2018-03-22 | 2024-03-08 | 维谛技术有限公司 | Parallel current equalizing system for switching devices |
| CN110401432A (en) * | 2018-04-24 | 2019-11-01 | 株式会社东芝 | Control circuit and power module |
| CN110401432B (en) * | 2018-04-24 | 2024-03-22 | 株式会社东芝 | Control circuit and power module |
| CN108964427A (en) * | 2018-06-29 | 2018-12-07 | 西安翌飞核能装备股份有限公司 | A kind of driving circuit and its working method of high-power converter semiconductor devices |
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