CN207304509U - A kind of IGBT short-circuit protections detection circuit - Google Patents
A kind of IGBT short-circuit protections detection circuit Download PDFInfo
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- CN207304509U CN207304509U CN201720898143.8U CN201720898143U CN207304509U CN 207304509 U CN207304509 U CN 207304509U CN 201720898143 U CN201720898143 U CN 201720898143U CN 207304509 U CN207304509 U CN 207304509U
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Abstract
The purpose of this utility model is to provide a kind of IGBT short-circuit protections detection circuit; the circuit in the input of IGBT or output terminal by being connected with series connection first resistor and second, third resistance of connecting with first resistor parallel connection; at the same time optocoupler diode is connected with the both ends of 3rd resistor; the receiving terminal of optocoupler diode is phototriode; warned by the way that whether phototriode occurs short circuit to IGBT; testing cost is effectively reduced, without special hardware detecting circuit.
Description
Technical field
Circuit protection field is the utility model is related to, is specifically related to a kind of IGBT short-circuit protections detection circuit.
Background technology
Insulated gate bipolar transistor（Insulated Gate Bipolar Transistor）Abbreviation IGBT, has logical
The advantages of state pressure drop is low, and current capacity is big, high with more input impedance, fast response time, controls the advantages of simple, therefore becomes
Main devices in power electronic system, but its weakness be overvoltage, overheat, shock resistance, anti-interference etc. endurance it is relatively low, therefore
The capacity of necessary correct selector when in use, will have stringent short-circuit protection circuit, no it will cause serious economic damage
Lose.
IGBT short-circuit protection circuits are generally protected using dedicated component, and such as HCPL-316J of AVAGO companies is special
With voltage Vce between units test IGBT collector and emitters, when IGBT is short-circuit, Vce voltages steeply rise, when more than setting
Component can turn off IGBT and play a protective role during definite value.
IGBT short-circuit protection circuits are generally protected using dedicated component, and this chip core technology is by offshore company
Grasp, therefore protect circuit cost very high, while volume is big, can not meet inexpensive small size products application.Therefore this practicality
It is new to be detected with a kind of inexpensive, simple circuit easily realized to complete IGBT short-circuit protections.
Utility model content
For these shortcomings of the prior art, the purpose of this utility model is to provide a kind of inspection of IGBT short-circuit protections
Slowdown monitoring circuit.The circuit can not only achieve the purpose that to protect IGBT, but also circuit cost is low, simple and easy to implement.
Wherein, a kind of IGBT short-circuit protections detection circuit, it is characterised in that the circuit input end be connected to series resistance R1 with
And series resistance R2, R3 in parallel with resistance R1, while optocoupler diode is connected with the both ends of resistance R3, optocoupler diode
Receiving terminal is phototriode, its collector is by resistance R4 connection voltage VCC, and its collector connecting fault signal output
End, its emitter ground connection, and the input terminal of resistance R1 connection power circuit, the output terminal of the output terminal of the circuit, i.e. resistance R1
The current input terminal of IGBT to be detected is connected, fault-signal output terminal is used to indicate whether IGBT occurs short circuit.
Preferably, the input terminal of the resistance R1 connects the current output terminal of IGBT to be detected, and the output terminal of resistance R1 connects
Ground connection or subsequent conditioning circuit.
Preferably, the resistance value selection of resistance R1-R3 and output power of power supply, IGBT overload capacity and load power demand phase
Matching.
Preferably, when detecting that short trouble occurs in IGBT, the fault-signal of short-circuit protection detection circuit output with
Sound, the mode of light are warned, or the mobile communication terminal of administrative staff is transmitted to by way of wifi, gsm, 3G, 4G.
The utility model has the advantage of overcome IGBT is protected using dedicated component in the prior art
Mode, effectively reduces cost and reliably protects IGBT, and can remind in time operating personnel to the IGBT of failure into
Row maintenance and replacement.
Brief description of the drawings
The small-power IGBT short-circuit protection detection circuit circuit diagrams of Fig. 1 the utility model.
Embodiment
The utility model is specifically described in conjunction with specific embodiments as follows：
The small-power IGBT short-circuit protection detection circuits of the utility model are connected on directly by detection by detection circuit
The resistance both end voltage on busbar is flowed to judge whether IGBT is short-circuit, and when resistance both end voltage is higher than setting value, detection circuit is produced
Raw short circuit fault signal.
Wherein, the input of IGBT short-circuit protections detection circuit be terminated with series resistance R1 and with resistance R1 is in parallel connects
Resistance R2, R3, while optocoupler diode is connected with the both ends of resistance R3, the receiving terminal of optocoupler diode is phototriode,
Its collector is by resistance R4 connection voltage VCC, and its collector connecting fault signal output part, its emitter ground connection.And
The input terminal connection circuit of resistance R1, the output terminal of resistance R1 connect the current input terminal of normal IGBT, certain resistance
The output terminal of R1 can also connect the circuits such as the rectification being made of IGBT, inversion, level conversion, access the current input terminal of IGBT
Or output terminal.
The resistance value selection of wherein resistance R1-R3 matches with output power of power supply and load power demand, will not be because of
The presence of resistance R1-R3 causes electric current to be remarkably decreased so as to influence the load capacity of power supply.
Certainly, the input terminal of resistance R1 can connect the current output terminal of IGBT to be detected, the output terminal connection of resistance R1
Ground or subsequent conditioning circuit, likewise, optocoupler diode can also be connected in parallel on the both ends of resistance R2.
When detecting that short trouble occurs in IGBT, its fault-signal exported can be warned in a manner of sound, light,
The mobile communication terminal of administrative staff can also be transmitted to by way of wifi or gsm, 3G, 4G, reminds custodian in time
Member's processing.
Although having been described for the preferred embodiment of the utility model, those skilled in the art once know substantially
Creative concept, then can make these embodiments other change and modification.So appended claims are intended to be construed to wrap
Include preferred embodiment and fall into all change and modification of the scope of the utility model.
Obviously, those skilled in the art can carry out the utility model various modification and variations without departing from this practicality
New spirit and scope.If in this way, these modifications and variations of the utility model belong to the utility model claims and
Within the scope of its equivalent technologies, then the utility model is also intended to comprising including these modification and variations.
Claims (4)
- A kind of 1. IGBT short-circuit protections detection circuit, it is characterised in that the circuit input end be connected to series resistance R1 and with electricity Series resistance R2, R3 of R1 parallel connections is hindered, while optocoupler diode, the receiving terminal of optocoupler diode are connected with the both ends of resistance R3 For phototriode, its collector is by resistance R4 connection voltage VCC, and its collector connecting fault signal output part, its Emitter is grounded, and the input terminal of resistance R1 connection power circuit, the output terminal connection of the output terminal of the circuit, i.e. resistance R1 are treated The current input terminal of IGBT is detected, fault-signal output terminal is used to indicate whether IGBT occurs short circuit.
- 2. IGBT short-circuit protections detection circuit as claimed in claim 1, it is characterised in that the input terminal connection of the resistance R1 The current output terminal of IGBT to be detected, the output terminal connection ground or subsequent conditioning circuit of resistance R1.
- 3. IGBT short-circuit protections detection circuit as claimed in claim 1, it is characterised in that resistance R1-R3 resistance value selection with Output power of power supply, IGBT overload capacity and load power demand match.
- 4. IGBT short-circuit protections detection circuit as claimed in claim 1, it is characterised in that detect that short trouble occurs in IGBT When, the fault-signal of short-circuit protection detection circuit output is warned in a manner of sound, light, or by wifi, gsm, The mode of 3G, 4G are transmitted to the mobile communication terminal of administrative staff.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720898143.8U CN207304509U (en) | 2017-07-24 | 2017-07-24 | A kind of IGBT short-circuit protections detection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720898143.8U CN207304509U (en) | 2017-07-24 | 2017-07-24 | A kind of IGBT short-circuit protections detection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207304509U true CN207304509U (en) | 2018-05-01 |
Family
ID=62447520
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720898143.8U Active CN207304509U (en) | 2017-07-24 | 2017-07-24 | A kind of IGBT short-circuit protections detection circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207304509U (en) |
-
2017
- 2017-07-24 CN CN201720898143.8U patent/CN207304509U/en active Active
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20200306 Address after: 100176 room 301-2, floor 3, building 3, No.A, Rongchang East Street, Beijing Economic and Technological Development Zone, Daxing District, Beijing Co-patentee after: Wuhu Qingneng Dechuang Electronic Technology Co.,Ltd. Patentee after: Qingneng Dechuang Electrical Technology (Beijing) Co., Ltd. Address before: 100070, No. 26, No. 15 West Ring Road, Beijing, Fengtai District, Lou Beidong Patentee before: Qingneng Dechuang Electrical Technology (Beijing) Co., Ltd. |
|
| TR01 | Transfer of patent right |