CN101707462B - Braking unit and IGBT module protection method thereof - Google Patents
Braking unit and IGBT module protection method thereof Download PDFInfo
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- CN101707462B CN101707462B CN2009101538538A CN200910153853A CN101707462B CN 101707462 B CN101707462 B CN 101707462B CN 2009101538538 A CN2009101538538 A CN 2009101538538A CN 200910153853 A CN200910153853 A CN 200910153853A CN 101707462 B CN101707462 B CN 101707462B
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- 230000003321 amplification Effects 0.000 claims description 3
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- 230000000737 periodic effect Effects 0.000 claims 2
- 239000003990 capacitor Substances 0.000 description 12
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Abstract
The invention provides a braking unit and an IGBT module protection method thereof. As an overcurrent detection circuit for detecting the VCE voltage of an IGBT module is arranged between an IGBT drive circuit and the IGBT module of the braking unit, when the overcurrent detection circuit detects that the VCE voltage of the IGBT module exceeds a maximum value, the IGBT drive circuit blocks output, so that the IGBT module can be protected from damage even if overcurrent occurs on large-inertia occasions.
Description
[technical field]
The present invention relates to frequency converter braking technology field, relate in particular to a kind of frequency converter brake unit with over-current detection function.
[background technology]
Brake unit is a device indispensable in the frequency converter, and is therefore very important to the safeguard measure in the brake unit course of work.The prior art patent No. is the patent document of CN200320107860.2, discloses a kind of brake unit that has the module failure testing circuit, still; When the IGBT module short circuit, the IGBT drive signal differs and is decided to be low level, for example centrigugal swing dryer; Because its inertia is very big, deceleration time is long, in case in braking procedure the IGBT module short circuit; Motor is also at high speed rotating, and always at regenerative electric energy, the busbar voltage of frequency converter can not be reduced to below the brake voltage through brake resistance and the discharge of IGBT module; The drive signal or the high level of brake unit control circuit do not protect brake unit at this moment.
Therefore be necessary to provide a kind of brake unit and guard method thereof, it not only can be suitable for the occasion of common braking brake, can also be suitable for the big occasion of inertia, in case under the occasion of big inertia, overcurrent takes place, also can protect the IGBT module not to be damaged.
[summary of the invention]
In view of this, the invention provides a kind of occasion that can be suitable for common braking brake, also can be suitable for the brake unit of the big occasion of inertia, can protect brake unit and frequency converter in time.
The present invention realizes through following technical scheme:
A kind of brake unit is provided; This brake unit is communicated with frequency converter through extraneous resistance; This brake unit comprises a control board and an insulated gate bipolar transistor IGBT module; When this frequency converter braking, this IGBT module operation of the IGBT driving circuit drives that is provided with on this control board also is provided with the V to this IGBT module between this IGBT drive circuit and this IGBT module
CEThe over-current detection circuit that voltage detects detects the V of this IGBT module when this over-current detection circuit
CEThis IGBT drive circuit blocked output when voltage surpassed maximum.
A kind of aforesaid brake unit is provided; Also be provided with IGBT drive waveforms generation circuit on this control board; This IGBT drive waveforms generation circuit is provided with a multivibrator; Out pin by this optocoupler after the square wave of its output one-period property, this square wave amplify via said light-coupled isolation exports this IGBT module to.
Another object of the present invention provides a kind of IGBT module protection method of brake unit; This brake unit is provided with an over-current detection circuit between IGBT drive circuit on its control board and IGBT module; This brake unit is when frequency converter is braked, and the operation of this brake unit comprises the steps: the IGBT driving circuit drives IGBT module on this brake unit control board; This over-current detection circuit is to the V of IGBT module
CEVoltage detects, if detect the V of this IGBT module
CEVoltage surpasses maximum, and this IGBT drive circuit blocks output immediately.
A kind of brake unit is provided; This brake unit comprises that a housing reaches and loam cake, a plurality of binding post, an IGBT module, a control board, a radiator of this shell; And first cement resistor and second cement resistor; These a plurality of binding posts are respectively the positive pole of direct voltage, the negative pole and the PR of direct voltage, and these a plurality of binding posts are successively set on an end of this housing, and this radiator is arranged on these a plurality of binding posts on one side; This IGBT module is arranged on this radiator the end near these a plurality of line terminals; This first cement resistor and second cement resistor are arranged on the other end of this radiator; Also be provided with the column of processing by electric conducting material between this IGBT module and two cement resistors; These control board two ends are separately fixed on this column and this IGBT module, between this IGBT module and a plurality of binding post through the conducting of many copper bars.
Compared with prior art, because the present invention is provided with the V that is used to detect this IGBT module between the IGBT of brake unit drive circuit and IGBT module
CEThe over-current detection circuit that voltage detects detects the V of this IGBT module when this over-current detection circuit
CEThis IGBT drive circuit blocked output when voltage surpassed maximum, even under the occasion of big like this inertia overcurrent takes place, also can protect the IGBT module not to be damaged.The present invention simultaneously also is provided with an IGBT drive waveforms generation circuit before the IGBT drive circuit; This IGBT drive waveforms generation circuit can produce the square wave of one-period property; Out pin by this optocoupler after this square wave amplifies via said light-coupled isolation exports this IGBT module to; Therefore can realize adopting the conducting mode alternately of turn-offing to drive the IGBT module; Can prevent effectively that the IGBT module is in the too fast too high problem of temperature rise that conducting state causes always, has further protected the IGBT module.
[description of drawings]
Fig. 1 is the braking principle sketch map of a kind of brake unit of the embodiment of the invention;
Fig. 2 is the circuit diagram of control board of the brake unit of the embodiment of the invention;
Fig. 3 is the structure vertical view of embodiment of the invention brake unit;
Fig. 4 is the left view of Fig. 3.
[embodiment]
Below, accompanying drawings and embodiment are made further detailed description to the present invention.
One embodiment of the present of invention adopt the IGBT module of following method protection frequency converter brake unit: when frequency converter begins to brake; IGBT driving circuit drives IGBT module on the brake unit control board; When said IGBT driving circuit drives IGBT module, the over-current detection circuit on this control board is to the V of IGBT module
CEVoltage detects, if detect the V of this IGBT module
CEVoltage surpasses maximum, and this IGBT drive circuit blocks output immediately, thus protection IGBT module.DESAT pin and voltage VE pin between of this over-current detection circuit through detecting the optocoupler in this IGBT drive circuit V that obtains the IGBT module wherein
CEVoltage.
Present embodiment can be through over-current detection circuit in real time to the V of IGBT module
CEVoltage detects, and when under the occasion of big inertia, overcurrent taking place, the output of in time blocking the IBGT driver module can protect the IGBT module not to be damaged.Simultaneously in order to prevent that the IGBT module is in too fast, the too high problem of conducting state intensification for a long time always; Can on the basis of present embodiment, increase an IGBT drive waveforms generation circuit; This IGBT drive waveforms generation circuit produces the square wave of one-period property in braking procedure; This square wave is isolated amplification through the IGBT drive circuit, drives the IGBT module at last, thereby makes it be in conducting, shutoff alternating state.
Consult Fig. 1, be the electrical schematic diagram of brake unit with over-current detection function.This brake unit is connected with frequency converter through external brake resistance.This brake unit comprises control board and IGBT module.Its course of work is: external brake resistance is received on the P and PR of brake unit, and the P of the P of brake unit and N and frequency converter and N connect, and DC bus-bar voltage is provided by the P and the N of frequency converter; Exchanging the DC bus-bar voltage of exporting after the three-phase 380V rectification generally speaking is 560V; When frequency converter begins to brake, DC bus-bar voltage is risen, and through dividing potential drop generations+15V voltage and+5V voltage; When DC bus-bar voltage is raised to 700V; And+15V voltage is normal, allows signal DRV to become high level, and IGBT drive waveforms generation this moment circuit is started working.Wherein+and 15V voltage is through the cement resistor dividing potential drop, obtains through voltage regulation filtering again.IGBT drive waveforms generation circuit output square wave, waveform is isolated amplification through the IGBT drive circuit, drives the IGBT module at last.In braking procedure, the IGBT over-current detection circuit is to the V of IGBT module
CEVoltage detects, as the V that detects the IGBT module
CEWhen voltage surpassed maximum, promptly stalling current surpassed the maximum current of IGBT module, and the IGBT drive circuit blocks output immediately, with protection IGBT module.
Please continue to consult Fig. 2, be the wiring diagram of the control board of brake unit.This control board is provided with IGBT drive waveforms generation circuit, IGBT drive circuit and over-current detection circuit.
This IGBT drive waveforms generation circuit comprises timer U1, resistance R 1, R2; Capacitor C 1, C2, C3, an end connection+5V power supply of resistance R 2, the other end connects 7 pin of timer U1; One end of resistance R 1 connects 7 pin of timer U1, and the other end connects 6 pin and 2 pin of timer U1 simultaneously, an end connection+5V power supply of capacitor C 3; Another termination N, an end of capacitor C 1 connects 2 pin of timer U1, another termination N; One end of capacitor C 2 connects 5 pin of timer U1, another termination N, and 3 pin of timer U1 are linked 1 pin of optocoupler U2.
This IGBT drive circuit comprises optocoupler U2, voltage-stabiliser tube Z1 (i.e. first voltage-stabiliser tube), Z2 (i.e. second voltage-stabiliser tube); Resistance R 3, R4 (i.e. the 4th resistance), R5 (i.e. the 5th resistance), capacitor C 4, C5, C6, C7 (i.e. the 7th electric capacity), an end of capacitor C 4 connects 1 pin of optocoupler U2; The other end connects 2 pin of optocoupler U2, and 2 pin of optocoupler U2 meet N, and an end of resistance R 3 connects 3 pin of optocoupler U2; The other end connects 5 pin of optocoupler U2, and an end of capacitor C 5 connects 5 pin of optocoupler U2, another termination N; 3 pin of optocoupler U2 connect+the 5V power supply, and 5 pin of optocoupler U2 meet DRV, 12,13 pin of a termination optocoupler U2 of capacitor C 6; Another termination N, 12,13 pin of optocoupler U2 connect+the 15V power supply, 11 pin of a termination optocoupler U2 of the 5th resistance R 5 (being the out pin); The other end links to each other with an end of the 7th capacitor C 7, the second voltage-stabiliser tube Z2, the 4th resistance R 4, and the other end of the 7th capacitor C 7, the 4th resistance R 4 links to each other with N, and the other end of the second voltage-stabiliser tube Z2 links to each other with the end of the first voltage-stabiliser tube Z1; The other end of the first voltage-stabiliser tube Z1 links to each other with N, i.e. this first voltage-stabiliser tube and second voltage-stabiliser tube series connection back is connected in parallel with the 7th electric capacity, the 4th resistance, and 4 pin of optocoupler U2,8 pin, 9 pin, 10 pin link to each other with N.
This over-current detection circuit comprises capacitor C 8 (i.e. the 8th electric capacity), voltage-stabiliser tube Z3 (i.e. the 3rd voltage-stabiliser tube); Resistance R 6 (i.e. the 6th resistance), diode D1 (i.e. first diode), D2 (i.e. second diode) are between 14 pin and 16 that capacitor C 8 (i.e. the 8th electric capacity) is connected optocoupler U2 are felt (being between DESAT pin and the VE pin); This 16 pin links to each other with N; The end of the 3rd voltage-stabiliser tube Z3 connects 14 pin of optocoupler U2, and the other end links to each other with an end of the 6th resistance R 6, and the other end of the 6th resistance R 6 links to each other with the first diode D1; The other end of the first diode D1 links to each other with the end of the second diode D2, another termination PR of the second diode D2.
DRV is a low level when frequency converter is non-on-position, and timer U1 quits work, and optocoupler U2 quits work.DRV is a high level when frequency converter is on-position, and timer U1 starts working, the square wave of the fixed duty cycle of 3 pin output of timer U1.When DRV is a high level, waveform is through 1 pin, the input of 2 pin of optocoupler U2, isolates through optocoupler U2 and amplifies the 11 pin output of back from optocoupler U2; Output is connected to resistance R 5, receives the grid of IGBT through resistance R 5, and voltage-stabiliser tube Z2, Z1 are the restriction driving voltage; R4 is a discharge resistance, has guaranteed that IGBT in time turn-offs, and 14 pin of optocoupler U2 and 16 pin are the over-current detection mouth; PR is equivalent to the collector electrode of IGBT module, and when 14 pin of optocoupler U2 and 16 pin voltages surpass 7V, promptly voltage surpasses the V of IGBT module between PR and N
CEMaximum voltage, this moment, optocoupler blocked output immediately.
Please together consulting Fig. 3 and Fig. 4, is respectively structure vertical view and the left view of an embodiment of brake unit of the present invention.
This brake unit have a housing 20 and with the loam cake 10 of this shell; Ends are provided with a plurality of binding posts successively in this housing 2: first binding post 1, second binding post 2 and the 3rd binding post 3; Wherein first binding post is the positive pole of direct voltage; Second binding post 2 is the negative pole of direct voltage, is the 3rd binding post 3 the PR (collector electrode that is equivalent to the IGBT module?).Be provided with a radiator 4 near these a plurality of binding posts in this housing 20; Be provided with IGBT module 5 near first, second and an end of the 3rd binding post on this radiator 4; The other end is provided with first cement resistor 6 and second cement resistor 7; Also be provided with the column of being processed by electric conducting material 8 (like the copper column) between IGBT module and two cement resistors, the two ends of the control board 9 of this brake unit are separately fixed on column 8 and the IGBT module 5.Three pins of this IGBT module (pin 51, pin 52 and pin 53) pass this control board 9, and are connected with the 3rd binding post 3 with first binding post 1, second binding post 2 through three copper bars (54,55 and 56) respectively.Adopt copper bar to connect in the present embodiment between the element, can bear big electric current and let whole device attractive in appearance again.
The embodiment of the invention is provided with the V that is used to detect this IGBT module between the IGBT of brake unit drive circuit and IGBT module
CEThe over-current detection circuit that voltage detects detects the V of this IGBT module when this over-current detection circuit
CEThis IGBT drive circuit blocked output when voltage surpassed maximum, even under the occasion of big like this inertia overcurrent takes place, also can protect the IGBT module not to be damaged.The embodiment of the invention also is provided with an IGBT drive waveforms generation circuit before the IGBT drive circuit simultaneously; This IGBT drive waveforms generation circuit can produce the square wave of one-period property; Out pin by this optocoupler after this square wave amplifies via said light-coupled isolation exports this IGBT module to; Therefore can realize adopting the conducting mode alternately of turn-offing to drive the IGBT module, can prevent further that the IGBT module is in the too fast too high problem of temperature rise that conducting state causes always.
More than a kind of brake unit and IGBT module protection method thereof that the embodiment of the invention provided have been carried out detailed introduction; Used concrete example among this paper principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as limitation of the present invention.
Claims (6)
1. brake unit; This brake unit is communicated with frequency converter through an extraneous resistance; This brake unit comprises a control board and an insulated gate bipolar transistor IGBT module; When this frequency converter braking, this IGBT module operation of the IGBT driving circuit drives that is provided with on this control board is characterized in that: also be provided with the V to this IGBT module between this IGBT drive circuit and this IGBT module
CEThe over-current detection circuit that voltage detects detects the V of this IGBT module when this over-current detection circuit
CEThis IGBT drive circuit blocked output when voltage surpassed maximum; This IGBT drive circuit comprises an optocoupler; This over-current detection circuit comprises the 3rd voltage-stabiliser tube, the 6th resistance, first diode and second diode that connects successively, and the 3rd voltage-stabiliser tube one end is connected with the 6th resistance, and the other end links to each other with the DESAT pin of this optocoupler; This second diode, one end links to each other with first diode; The other end links to each other with the collector electrode of this IGBT module, and this over-current detection circuit also comprises one the 8th electric capacity, and the 8th electric capacity is connected between the DESAT pin and VE pin of this optocoupler; This VE pin is communicated with the V of said IGBT module simultaneously with the DC bus-bar voltage negative pole
CEVoltage is the voltage between this DESAT pin and this VE pin.
2. brake unit as claimed in claim 1; It is characterized in that: also be provided with IGBT drive waveforms generation circuit on this control board; This IGBT drive waveforms generation circuit is provided with a multivibrator; Out pin by this optocoupler after the square wave of its output one-period property, this square wave amplify via said light-coupled isolation exports this IGBT module to.
3. brake unit as claimed in claim 2; It is characterized in that: this out pin is connected with the 5th resistance; Be connected to the grid of this IGBT module through the 5th resistance, this out pin also is provided with the 4th resistance that is used to discharge and first voltage-stabiliser tube, second voltage-stabiliser tube that are used to limit driving voltage and the 7th electric capacity; Wherein this first voltage-stabiliser tube and second voltage-stabiliser tube series connection back is connected in parallel with the 7th electric capacity, the 4th resistance, links to each other with the DC bus-bar voltage negative pole then.
4. brake unit as claimed in claim 2 is characterized in that: the periodic square wave of said IGBT drive waveforms generation circuit output is the fixed duty cycle square wave.
5. the IGBT module protection method of a brake unit, this brake unit is provided with an over-current detection circuit between IGBT drive circuit on its control board and IGBT module, it is characterized in that this brake unit comprises the steps: when frequency converter is braked
IGBT driving circuit drives IGBT module on this brake unit control board;
This over-current detection circuit is to the V of IGBT module
CEVoltage detects, if detect the V of this IGBT module
CEVoltage surpasses maximum, and this IGBT drive circuit blocks output immediately;
Comprise an optocoupler in this IGBT drive circuit; This over-current detection circuit comprises the 3rd voltage-stabiliser tube, the 6th resistance, first diode and second diode that connects successively, and the 3rd voltage-stabiliser tube one end is connected with the 6th resistance, and the other end links to each other with the DESAT pin of this optocoupler; This second diode, one end links to each other with first diode; The other end links to each other with the collector electrode of this IGBT module, and this over-current detection circuit also comprises one the 8th electric capacity, and the 8th electric capacity is connected between the DESAT pin and VE pin of this optocoupler; This VE pin is communicated with the DC bus-bar voltage negative pole simultaneously, and said over-current detection circuit is to the V of IGBT module
CEIt is to be obtained by DESAT pin and the voltage between the VE pin of this over-current detection circuit through detecting the optocoupler in this IGBT drive circuit that voltage detects.
6. method as claimed in claim 5 is characterized in that, also is provided with IGBT drive waveforms generation circuit and dc bus on this control board, also comprises the steps: before the said IGBT driving circuit drives IGBT module
The DC bus-bar voltage of control unit raises, and through the voltage of dividing potential drop generation+15V;
When the voltage of this dc bus be increased to that 700V and this dividing potential drop produce+15V voltage just often, allow signal DRV to become high level, this IGBT drive waveforms generation circuit produces the square wave of one-period property;
This IGBT module of said IGBT driving circuit drives is specially, and this IGBT module is exported and driven to this periodic square wave after isolating amplification through this IGBT drive circuit.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101538538A CN101707462B (en) | 2009-11-16 | 2009-11-16 | Braking unit and IGBT module protection method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101538538A CN101707462B (en) | 2009-11-16 | 2009-11-16 | Braking unit and IGBT module protection method thereof |
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| CN101707462A CN101707462A (en) | 2010-05-12 |
| CN101707462B true CN101707462B (en) | 2012-07-11 |
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| CN104935215A (en) * | 2015-06-05 | 2015-09-23 | 柳州弘天科技有限公司 | Braking unit |
| CN110299721B (en) * | 2018-03-23 | 2020-09-08 | 北京金风科创风电设备有限公司 | Braking power control method and device and wind generating set |
| CN112172763B (en) * | 2019-07-05 | 2021-09-10 | 株洲中车时代电气股份有限公司 | Electric braking power distribution method, device and medium for hybrid power tramcar |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201571006U (en) * | 2009-11-16 | 2010-09-01 | 肖海乐 | Brake unit |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201571006U (en) * | 2009-11-16 | 2010-09-01 | 肖海乐 | Brake unit |
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