CN203595771U - IGBT pipe short circuit protection detection circuit - Google Patents
IGBT pipe short circuit protection detection circuit Download PDFInfo
- Publication number
- CN203595771U CN203595771U CN201320706737.6U CN201320706737U CN203595771U CN 203595771 U CN203595771 U CN 203595771U CN 201320706737 U CN201320706737 U CN 201320706737U CN 203595771 U CN203595771 U CN 203595771U
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- igbt
- detection circuit
- charging capacitor
- switching diode
- short circuit
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Abstract
Provided is an IGBT pipe short circuit protection detection circuit. The detection circuit comprises a detection resistor connected onto an IGBT collector. The other end of the detection resistor is connected with a positive input end of a comparator. A switching diode and a charging capacitor are arranged on the connection route of the detection resistor and the comparator in order. The other end of the charging capacitor is connected with the ground. The other end of the switching diode is connected with a 15V power supply. The detection circuit is simple in structure. In the detection circuit, the voltage of the IGBT collector is detected by utilization of the detection resistor, and the reliability is high. In addition, the action of the detection circuit is sensitive because of arrangement of the switching diode and the charging capacitor.
Description
Technical field
The utility model relates to a kind of new testing circuit of IGBT short-circuit protection.
Background technology
Existing IGBT short-circuit protection testing circuit, as shown in Figure 1, is the collection emitter voltage that detects IGBT by diode D, and its principle of work is: B point is the reverse input end of comparer, and its voltage is a steady state value, and magnitude of voltage is the product of crossing current source I1 and resistance R th.When IGBT normally, the collector voltage Vce of IGBT is saturation value, generally in 2V left and right.And the voltage that A is ordered is the pressure drop of collector voltage Vce, diode D and the pressure drop sum that constant current source I2 produces in resistance R, be generally 3V left and right.In the time of IGBT short circuit, the collector voltage Vce of IGBT is DC bus-bar voltage, can reach hundreds of or several kilovolts, diode D cut-off, and constant current source I2 charges to capacitor C, and in the time that A point current potential exceedes B point current potential, comparer overturns, and reaches protection object.
This testing circuit can cause normally working because diode D is reversed to puncture, in addition the serviceable life of diode D also limited, therefore this testing circuit is unreliable in practice, and action sensitive not.
Summary of the invention
The purpose of this utility model is to provide a kind of sensitiveer, the more reliable IGBT tube short circuit protection of protection testing circuit that moves.
For achieving the above object, the utility model is by the following technical solutions:
A kind of IGBT tube short circuit protection testing circuit, it comprises the detection resistance that is connected to IGBT collector, the other end that detects resistance is connected to the positive input of comparer; On the connecting path that detects resistance and comparer, set gradually switching diode and charging capacitor, wherein, the other end of charging capacitor connects ground; The other end of switching diode connects 15V power supply.
On the connecting path that detects resistance and comparer, also connect and be provided with dropping resistor.
Adopt the utility model of technique scheme, simple in structure, utilize detection resistance to detect the collector voltage of IGBT, reliability is stronger.And the setting of switching diode and charging capacitor, also makes the utility model action sensitiveer.
Accompanying drawing explanation
Fig. 1 is the circuit theory diagrams of prior art.
Fig. 2 is circuit theory diagrams of the present utility model.
Embodiment
As shown in Figure 2, a kind of IGBT tube short circuit protection testing circuit, it comprises the detection resistance R vce that is connected to IGBT collector, the other end that detects resistance R vce is connected to the positive input A of comparer; On the connecting path that detects resistance R vce and comparer, set gradually switching diode Dm and charging capacitor Ca, wherein, the other end of charging capacitor Ca connects ground; The other end of switching diode Dm connects 15V power supply.
On the connecting path that detects resistance R vce and comparer, also connect and be provided with dropping resistor Rm.
Principle of work of the present utility model is: detect the collector voltage of IGBT by detecting resistance R vce, its principle of work is: B point produces reference voltage, identical with Fig. 1.When IGBT normally, the collector voltage Vce of IGBT is saturation voltage, switching diode Dm cut-off, and charging capacitor Ca is without charge circuit, and A point voltage is stable.In the time of IGBT short circuit, collector voltage rises to busbar voltage, now switching diode Dm forward conduction, and current direction is as shown by the arrows in Figure 2.Owing to detecting the metering function of resistance R vce, 15V power supply, as load source, makes A point current potential by improving rapidly to charging capacitor Ca charging, and end value equals the voltage drop that 15V adds switching diode Dm, then deducts the voltage drop of dropping resistor Rm.The new testing circuit action of IGBT short-circuit protection is faster, protects more reliable.
Claims (2)
1. an IGBT tube short circuit protection testing circuit, is characterized in that: it comprises the detection resistance (Rvce) that is connected to IGBT collector, and the other end that detects resistance (Rvce) is connected to the positive input (A) of comparer; On the connecting path that detects resistance (Rvce) and comparer, set gradually switching diode (Dm) and charging capacitor (Ca), wherein, the other end of charging capacitor (Ca) connects ground; The other end of switching diode (Dm) connects 15V power supply.
2. IGBT tube short circuit according to claim 1 protection testing circuit, is characterized in that: on the connecting path that detects resistance (Rvce) and comparer, also connect and be provided with dropping resistor (Rm).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320706737.6U CN203595771U (en) | 2013-11-11 | 2013-11-11 | IGBT pipe short circuit protection detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320706737.6U CN203595771U (en) | 2013-11-11 | 2013-11-11 | IGBT pipe short circuit protection detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203595771U true CN203595771U (en) | 2014-05-14 |
Family
ID=50676640
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320706737.6U Expired - Fee Related CN203595771U (en) | 2013-11-11 | 2013-11-11 | IGBT pipe short circuit protection detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203595771U (en) |
-
2013
- 2013-11-11 CN CN201320706737.6U patent/CN203595771U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140514 Termination date: 20141111 |
|
| EXPY | Termination of patent right or utility model |