CN203896182U - IGBT driving protection circuit aiming at over-current of frequency converter - Google Patents
IGBT driving protection circuit aiming at over-current of frequency converter Download PDFInfo
- Publication number
- CN203896182U CN203896182U CN201420212360.3U CN201420212360U CN203896182U CN 203896182 U CN203896182 U CN 203896182U CN 201420212360 U CN201420212360 U CN 201420212360U CN 203896182 U CN203896182 U CN 203896182U
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- Prior art keywords
- frequency converter
- igbt module
- igbt
- current
- protection circuit
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- 238000000034 method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
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- Inverter Devices (AREA)
- Power Conversion In General (AREA)
Abstract
The utility model discloses an IGBT driving protection circuit aiming at over-current of a frequency converter. The IGBT driving protection circuit comprises lower arm driving signals of a three-phase IGBT module and upper arm driving signals of the three-phase IGBT module. The lower arm driving signals of the three-phase IGBT module are connected with a first input terminal of three OR gates, and a second input terminal of the three OR gates is connected with the same fault signals. An output terminal of the three OR gates is connected with a lower arm of the IGBT module. The upper arm driving signals of the three-phase IGBT module are connected with an upper arm of the IGBT module. According to the IGBT driving protection circuit provided by the utility model, through cooperation work of the fault-signals and the OR gates, under the condition of over-current output by the frequency converter, the lower arm driving of the IGBT module is closed through three OR gates by a detecting circuit, a driving voltage of the lower arm of the IGBT module is cut off, hence amplitude of the output current is reduced, and the frequency converter and the motor are protected from being damaged by over-current. Through testing, the design of the protection circuit can meet requirements of each function of the frequency converter.
Description
Technical field
The utility model relates to circuit protection technical field, relate in particular to a kind of in frequency converter the Drive Protecting Circuit as the IGBT of device for power switching.
Background technology
Frequency converter is equipment conventional in a kind of Speed Process of DC Motor, for realizing the stepless speed regulation of alternating current machine.Frequency converter has adopted a large amount of power devices on circuit, and cut-offs with higher frequency conducting.At present, because insulated gate bipolar transistor (IGBT) has easy driving and can process large electric current and high-tension feature with high switching frequency, thereby big-power transducer is widely used IGBT as device for power switching both at home and abroad.When inverter output terminal electric current is excessive, easily cause motor or frequency converter to damage, therefore the driving protection of IGBT is just become to the important topic that is related to frequency converter complete machine functional reliability.
Utility model content
The utility model aims to provide a kind of IGBT Drive Protecting Circuit of crossing flow problem for frequency converter, when frequency converter output current is excessive, plays the effect that reduces output current.
The technical solution of the utility model is as follows:
For frequency converter, cross an IGBT Drive Protecting Circuit for flow problem, comprise that three-phase IGBT module underarm drives signal and three-phase IGBT module upper arm to drive signal; Described three-phase IGBT module underarm drives signal to be connected with the first input end of three or gate device respectively, the second input of described three or gate device is connected with same fault-signal, and the output of described three or gate device is connected with the underarm of IGBT module respectively; Described three-phase IGBT module upper arm drives signal to be connected with the upper arm of IGBT module respectively.
Its further technical scheme is:
First input end described or gate device is connected with pull-up resistor.
The second input described or gate device is connected with drop-down electric capacity.
Output described or gate device is in series with current-limiting resistance.
Described three-phase IGBT module upper arm drives signal series limiting resistor.
Useful technique effect of the present utility model is:
The utility model by fault-signal with or door cooperating; the in the situation that of frequency converter output overcurrent; by circuit for detecting, using three or goalkeeper IGBT module underarm to drive closes; cut off the driving voltage of IGBT module underarm; output current amplitude is declined, and protection frequency converter and motor be not because overcurrent damages.After tested, this protecting circuit designed can meet the needs of frequency converter various functions.
Accompanying drawing explanation
Fig. 1 is circuit theory diagrams of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, embodiment of the present utility model is described further.
As shown in Figure 1, U, V, W are respectively the pwm signal of the driving IGBT module upper arm of CPU output, U ', V ', W ' are respectively the pwm signal of the driving IGBT module underarm of CPU output, and IC15A, IC15B, IC15D are or gate device that CLimit makes a general reference a fault-signal.During normal work, the U of CPU, V, W, U ', V ', W ' export the six normal pwm signals in tunnel, fault-signal CLimit is normally low level 0V state, now IC15A, IC15B, IC15D tri-roads or goalkeeper's output and U ', V ', the pwm signal that W ' is identical, when output current is excessive, through hardware circuits which process, fault-signal CLimit is from become+5V of 0V high level signal, this signal and U ', V ', W ' three-phase drive phase or, IC15A now, IC15B, IC15D tri-roads or door all will be exported high level+5V signal, thereby IGBT module underarm is driven and turn-offed, thereby output current is declined, when electric current is down to normal value, fault-signal CLimit becomes low level 0V from high level+5V, IC15A, IC15B, IC15D tri-roads or door continue normal output and U ', V ', the pwm signal that W ' is identical, circuit recovers normal operating conditions.
Components and parts model in embodiment illustrated in fig. 1 can see table:
Main components table in Fig. 1
| Sequence number | Components and parts code name | Components and parts type | Component parameter or model |
| 1 | IC15A\IC15B\IC15D | Or door | 74HC32 |
| 2 | CON3 | Splicing ear | ------ |
| 3 | R182\R190\R193 | Resistance | 4.7kJ |
| 4 | C79 | Electric capacity | 0.01μF |
| 5 | R200～R205 | Resistance | 287RF |
Above-described components and parts are commercial goods.
This circuit by fault-signal CLimit with or the cooperating of door IC15A, IC15B, IC15D; at frequency converter at output overcurrent in the situation that; cut off the driving voltage of IGBT module underarm; output current amplitude is declined; protection frequency converter and motor be not because overcurrent damages; realized the innovation of hardware circuit, after tested, this protecting circuit designed can meet the needs of frequency converter various functions.
Above-described is only preferred implementation of the present utility model, and the utility model is not limited to above embodiment.Be appreciated that the oher improvements and changes that those skilled in the art directly derive or associate under the prerequisite that does not depart from spirit of the present utility model and design, within all should thinking and being included in protection range of the present utility model.
Claims (5)
1. for frequency converter, cross an IGBT Drive Protecting Circuit for flow problem, it is characterized in that: comprise that three-phase IGBT module underarm drives signal and three-phase IGBT module upper arm to drive signal; Described three-phase IGBT module underarm drives signal to be connected with the first input end of three or gate device respectively, the second input of described three or gate device is connected with same fault-signal, and the output of described three or gate device is connected with the underarm of IGBT module respectively; Described three-phase IGBT module upper arm drives signal to be connected with the upper arm of IGBT module respectively.
2. for frequency converter, cross according to claim 1 the IGBT Drive Protecting Circuit of flow problem, it is characterized in that: first input end described or gate device is connected with pull-up resistor.
3. for frequency converter, cross according to claim 1 the IGBT Drive Protecting Circuit of flow problem, it is characterized in that: the second input described or gate device is connected with drop-down electric capacity.
4. for frequency converter, cross according to claim 1 the IGBT Drive Protecting Circuit of flow problem, it is characterized in that: output described or gate device is in series with current-limiting resistance.
5. for frequency converter, cross according to claim 1 the IGBT Drive Protecting Circuit of flow problem, it is characterized in that: described three-phase IGBT module upper arm drives signal series limiting resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420212360.3U CN203896182U (en) | 2014-04-28 | 2014-04-28 | IGBT driving protection circuit aiming at over-current of frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420212360.3U CN203896182U (en) | 2014-04-28 | 2014-04-28 | IGBT driving protection circuit aiming at over-current of frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203896182U true CN203896182U (en) | 2014-10-22 |
Family
ID=51722534
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420212360.3U Expired - Lifetime CN203896182U (en) | 2014-04-28 | 2014-04-28 | IGBT driving protection circuit aiming at over-current of frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203896182U (en) |
-
2014
- 2014-04-28 CN CN201420212360.3U patent/CN203896182U/en not_active Expired - Lifetime
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20141022 |
|
| CX01 | Expiry of patent term |