CN106253206A - The fast short-circuit protective circuit of frequency changer direct current bus and device - Google Patents
The fast short-circuit protective circuit of frequency changer direct current bus and device Download PDFInfo
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- CN106253206A CN106253206A CN201610683088.0A CN201610683088A CN106253206A CN 106253206 A CN106253206 A CN 106253206A CN 201610683088 A CN201610683088 A CN 201610683088A CN 106253206 A CN106253206 A CN 106253206A
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- circuit
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- audion
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/08—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current
- H02H3/087—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection responsive to excess current for dc applications
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Abstract
The present invention relates to protecting circuit for electrical equipment; it is specifically related to the fast short-circuit protective circuit of a kind of frequency changer direct current bus; it is characterized in that including more than one person of outstanding talent Europe resistance R1, resistance R2, R3, R4, R5, R6, more than one current-limiting resistance R7; PNP triode Q1, PNP triode Q2; NPN audion Q3, Zener diode ZD1, ZD2, photoelectrical coupler PC1; electric capacity C1, C2, C3, described photoelectrical coupler PC1 includes light emitting diode D1 and phototriode Q4.The fast short-circuit protective circuit of the frequency changer direct current bus that the present invention provides is when converter short-circuited outside or DC bus current are excessive; can make a response within the extremely short time; turn off the output of IGBT drive circuit; so that IGBT avoids burning out because of short circuit; without using software detection; reliability is higher, production low cost, is substantially reduced the maintenance cost of enterprise.
Description
The application is the divisional application of " short-circuit protection circuit of frequency changer direct current bus ", the filing date 2014 of original application
On August 7, in, Application No.: 201410385558.6.
Technical field
The present invention relates to protecting circuit for electrical equipment, be specifically related to the short-circuit protection electricity of a kind of frequency changer direct current bus
Road.
Background technology
During daily motor controls, important role taken on by converter.Motor in use, due to people
For reasons such as wiring error, the damage of motor ages serious winding insulation, control signal electromagnetic interference, it is easy to cause converter defeated
Going out short trouble, transcient short circuit time electric current is very big, beyond the running current scope of IGBT pipe.If within the time of regulation
The PWM output of converter can not be turned off timely and effectively, may result in IGBT pipe and burn out because of short circuit overcurrent.
Existing, as disclosed in Authorization Notice No. CN 202749802 U, during a kind of converter output short-circuit, protect IGBT
Circuit, the detection mode used is mainly voltage monitoring and current detecting, voltage detecting by detection IGBT colelctor electrode and
The pressure drop of emitter stage and then judge that IGBT is as straight-through or output short-circuit.By the pressure drop of collector and emitter during short circuit with set
Fixed threshold value carries out wherein comparing, and the output signal of comparator controls the shutoff of drive circuit.Current detecting is led to
Cross the size of current of detection dc bus, with the threshold ratio set relatively, then go to the pass controlling to drive signal with the output of comparator
Disconnected.The short circuit duration that IGBT can bear is the shortest, the most only 10 μ s.The existing short-circuit protection circuit of converter is by collection
Become intelligent drives optocoupler and Hall detection to protect IGBT, but for enterprise, use the maintenance of both components and parts
High cost, this is accomplished by providing a short-circuit protection response time quick, lower-cost protection circuit.
Summary of the invention
For overcoming deficiency of the prior art, it is an object of the invention to provide a kind of react quickly, the converter of low cost
The fast short-circuit protective circuit of dc bus.
It is a further object of the present invention to provide a kind of react quickly, the rapid cut-off of the frequency changer direct current bus of low cost is protected
Protection unit.
For achieving the above object, the technical solution used in the present invention is as follows: the rapid cut-off of a kind of frequency changer direct current bus
Protection circuit, it is characterised in that: include more than one milliohm resistance R1, resistance R2, R3, R4, R5, R6, more than one current limliting electricity
Resistance R7, PNP triode Q1, PNP triode Q2, NPN audion Q3, Zener diode ZD1, ZD2, photoelectrical coupler PC1, electric capacity
C1、C2、C3；Described photoelectrical coupler PC1 includes light emitting diode D1 and phototriode Q4；
Described converter rectification circuit anode P connect milliohm resistance R1 to P2, positive pole P connect Zener diode ZD1 the moon
Pole, the anode of polar capacitor C1 and the anode of light emitting diode, the negative electrode of polar capacitor C1 is connected with the anode of ZD1, audion
The emitter stage of Q1 is connected to P2, and the base stage of the base stage of audion Q1, colelctor electrode and audion Q2 connects, and audion Q1 colelctor electrode
Be connected to the anode of Zener diode ZD1 by resistance R6, electric capacity C3 is in parallel with resistance R6, and the emitter stage of audion Q2 is by electricity
Resistance R2 is connected to positive pole P, and the colelctor electrode of audion Q2 resistance R3, R4 in parallel and electric capacity C2 are connected to Zener diode
Anode, the base stage of audion Q3 is connected with the colelctor electrode of audion Q2, and the emitter stage of audion Q3 is connected to Zener diode ZD2
Negative electrode, and the anode of Zener diode ZD2 is connected to the anode of Zener diode ZD1, and the colelctor electrode of audion Q3 is by electricity
Resistance R5 is connected to the negative electrode of light emitting diode D1, and the anode of Zener diode ZD1 is connected to negative pole N1, light by current-limiting resistance R7
Quick audion Q4 grounded emitter, current collection extremely signal output part.
Further, described milliohm resistance includes resistance R11 and R12 of parallel connection.
Further, described current-limiting resistance includes resistance R71, R72 and R73 of series connection.
Further, also including resistance R8, phototriode Q4 emitter stage passes through resistance R8 ground connection, and collector signal exports
To CPU processor.
Further, described electric capacity C1 is 10UF, and breakdown voltage is 50V.
The fast short-circuit protective device of a kind of frequency changer direct current bus, has fast short-circuit protective circuit, this rapid cut-off
The fast short-circuit protective circuit of the frequency changer direct current bus described in protection circuit employing.
Seen from the above description, the short-circuit protection circuit of the frequency changer direct current bus that the present invention provides is sent out outside converter
When raw short circuit or DC bus current are excessive, it is possible to make a response within the extremely short time, turn off the output of IGBT drive circuit,
So that IGBT avoids burning out because of short circuit, it is not necessary to using software detection, reliability is higher, production low cost, significantly drops
The maintenance cost of low enterprise.
Accompanying drawing explanation
Fig. 1 is the working frame schematic diagram of the short-circuit protection circuit of frequency changer direct current bus of the present invention.
Fig. 2 is the circuit connection diagram of the short-circuit protection circuit of frequency changer direct current bus of the present invention.
Detailed description of the invention
Below by way of detailed description of the invention, the invention will be further described.
As depicted in figs. 1 and 2, the short-circuit protection circuit of frequency changer direct current bus include two 10 milliohms resistance R11 and
R12, resistance R2, R3, R4, R5, R8, current-limiting resistance R71, R72, R73, PNP triode Q1, PNP triode Q2, NPN audion
Q3, Zener diode ZD1, ZD2, photoelectrical coupler PC1, electric capacity C1, C2, C3；Described photoelectrical coupler PC1 includes light-emitting diodes
Connect milliohm resistance R1 to P2, positive pole P of pipe D1 and phototriode Q4, described converter rectification circuit anode P connects voltage stabilizing two
The negative electrode of pole pipe ZD1, the anode of polar capacitor C1 and the anode of light emitting diode, the negative electrode of polar capacitor C1 and the anode of ZD1
Connecting, the emitter stage of audion Q1 is connected to P2, and the base stage of the base stage of audion Q1, colelctor electrode and audion Q2 connects, and three
Pole pipe Q1 colelctor electrode is connected to the anode of Zener diode ZD1 by resistance R6, and electric capacity C3 is in parallel with resistance R6, audion Q2's
Emitter stage is connected to positive pole P by resistance R2, and the colelctor electrode of audion Q2 resistance R3, R4 in parallel and electric capacity C2 are connected to
The anode of Zener diode, the base stage of audion Q3 is connected with the colelctor electrode of audion Q2, and the emitter stage of audion Q3 is connected to
The negative electrode of Zener diode ZD2, and the anode of Zener diode ZD2 is connected to the anode of Zener diode ZD1, audion Q3's
Colelctor electrode is connected to the negative electrode of light emitting diode D1 by resistance R5, the anode of the Zener diode ZD1 current limliting electricity by series connection
Resistance R71, R72 and R73 be connected to negative pole N1, phototriode Q4 emitter stage pass through resistance R8 ground connection, collector signal export to
CPU processor, electric capacity C1 is 10UF, and breakdown voltage is 50V.
In converter rectification circuit anode P series connection milliohm resistor current sample circuit R11, R12 to P2, when major loop electricity
Within the scope of stream is operated in 2 times of rated current, due to the effect of Zener diode ZD1, provide one at electric capacity C1 negative terminal
With reference to 11V (C point current potential), audion Q1, Q2, Q3 are in cut-off state, and protection circuit is failure to actuate；Occur when converter is outside
Short circuit or major loop operating current are more than more than 2.5 times of rated current, and between dc bus P, N, voltage drastically declines so that C
The current potential of point drastically drops to 15V, and audion Q1, Q2 are the most open-minded, and B current potential rises to rapidly high level, and audion Q3 leaves
Logical, now photoelectrical coupler PC1 opens and sends short circuit alarm signal to CPU processor, and CPU sends shutoff PWM pulsewidth immediately
Modulated signal, block pwm signal output thus to protect IGBT without damage, this process time is extremely short, has only used three microseconds
(3uS).Having short-circuit conditions whenever running into output, this circuit can play protection and make within the fastest time (3uS) accurately
With, until short-circuit bar removes；Audion Q1 plays the effect that upset resets in circuit, and owing to audion Q1 is open-minded, A point current potential is extensive
Multiple to high level, audion Q2 ends immediately, and meanwhile the current potential of B point declines rapidly, then audion Q3 ends, light thermocouple
Clutch PC1 stops sending short circuit alarm signal, immediately falls back to normal duty.
Above are only some detailed description of the invention of the present invention, but the design concept of the present invention is not limited thereto, all profits
With this design, the present invention is carried out the change of unsubstantiality, the behavior invading scope all should be belonged to.
Claims (4)
1. the fast short-circuit protective circuit of frequency changer direct current bus, it is characterised in that: include more than one milliohm resistance R1, resistance
R2, R3, R4, R5, R6, more than one current-limiting resistance R7, PNP triode Q1, PNP triode Q2, NPN audion Q3, voltage stabilizing two
Pole pipe ZD1, ZD2, photoelectrical coupler PC1, electric capacity C1, C2, C3；Described photoelectrical coupler PC1 includes light emitting diode D1 and light
Quick audion Q4；
Connect milliohm resistance R1 to P2, positive pole P of described converter rectification circuit anode P connects the negative electrode of Zener diode ZD1, pole
Property the anode of electric capacity C1 and the anode of light emitting diode, the negative electrode of polar capacitor C1 is connected with the anode of ZD1, and audion Q1 sends out
Emitter-base bandgap grading is connected to P2, and the base stage of the base stage of audion Q1, colelctor electrode and audion Q2 connects, and audion Q1 colelctor electrode is by electricity
Resistance R6 is connected to the anode of Zener diode ZD1, and electric capacity C3 is in parallel with resistance R6, and the emitter stage of audion Q2 is by resistance R2 even
Being connected to positive pole P, the colelctor electrode of audion Q2 resistance R3, R4 in parallel and electric capacity C2 are connected to the anode of Zener diode,
The base stage of audion Q3 is connected with the colelctor electrode of audion Q2, and the emitter stage of audion Q3 is connected to the moon of Zener diode ZD2
Pole, and the anode of Zener diode ZD2 is connected to the anode of Zener diode ZD1, the colelctor electrode of audion Q3 passes through resistance R5
Being connected to the negative electrode of light emitting diode D1, the anode of Zener diode ZD1 is connected to negative pole N1 by current-limiting resistance R7, and photosensitive three
Pole pipe Q4 grounded emitter, current collection extremely signal output part；
Described milliohm resistance includes resistance R11 and R12 of parallel connection；Described current-limiting resistance include series connection resistance R71, R72 and
R73。
The fast short-circuit protective circuit of frequency changer direct current bus the most according to claim 1, it is characterised in that: also include electricity
Resistance R8, phototriode Q4 emitter stage passes through resistance R8 ground connection, and collector signal exports to CPU processor.
The fast short-circuit protective circuit of frequency changer direct current bus the most according to claim 1, it is characterised in that: described electric capacity
C1 is 10UF, and breakdown voltage is 50V.
4. a fast short-circuit protective device for frequency changer direct current bus, has fast short-circuit protective circuit, it is characterised in that: this
Fast short-circuit protective circuit uses the fast short-circuit protective of the frequency changer direct current bus as according to any one of claim 1-3
Circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610683088.0A CN106253206B (en) | 2014-08-07 | 2014-08-07 | The fast short-circuit protective circuit and device of frequency changer direct current bus |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410385558.6A CN104167710B (en) | 2014-08-07 | 2014-08-07 | A kind of short-circuit protection circuit of frequency changer direct current bus |
| CN201610683088.0A CN106253206B (en) | 2014-08-07 | 2014-08-07 | The fast short-circuit protective circuit and device of frequency changer direct current bus |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410385558.6A Division CN104167710B (en) | 2014-08-07 | 2014-08-07 | A kind of short-circuit protection circuit of frequency changer direct current bus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106253206A true CN106253206A (en) | 2016-12-21 |
| CN106253206B CN106253206B (en) | 2018-12-04 |
Family
ID=51911420
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610683088.0A Active CN106253206B (en) | 2014-08-07 | 2014-08-07 | The fast short-circuit protective circuit and device of frequency changer direct current bus |
| CN201410385558.6A Expired - Fee Related CN104167710B (en) | 2014-08-07 | 2014-08-07 | A kind of short-circuit protection circuit of frequency changer direct current bus |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410385558.6A Expired - Fee Related CN104167710B (en) | 2014-08-07 | 2014-08-07 | A kind of short-circuit protection circuit of frequency changer direct current bus |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN106253206B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111200277A (en) * | 2020-02-26 | 2020-05-26 | 浙江禾川科技股份有限公司 | Servo driver and overcurrent fault protection circuit thereof |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108282398A (en) * | 2018-01-31 | 2018-07-13 | 佛山市聚成知识产权服务有限公司 | A kind of internet security gateway |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SU609168A1 (en) * | 1976-09-27 | 1978-05-30 | Казахский Химико-Технологический Институт | Frequency converter protection method |
| CN201789275U (en) * | 2010-04-16 | 2011-04-06 | 浙江理工大学 | Over-current protection circuit of frequency converter |
| CN101867174B (en) * | 2010-06-07 | 2013-04-24 | 大连海事大学 | IGBT short-circuit protection circuit in frequency converter and method thereof |
| CN202405760U (en) * | 2012-01-10 | 2012-08-29 | 中冶南方（武汉）自动化有限公司 | Over-current protection circuit of frequency converter |
| CN202749802U (en) * | 2012-09-06 | 2013-02-20 | 深圳市步科电气有限公司 | Circuit for protecting IGBT in output short-circuit state of frequency converter |
| CN204030548U (en) * | 2014-09-11 | 2014-12-17 | 石狮市酷瑞电气有限责任公司 | A kind of short-circuit protection circuit of frequency changer direct current bus |
-
2014
- 2014-08-07 CN CN201610683088.0A patent/CN106253206B/en active Active
- 2014-08-07 CN CN201410385558.6A patent/CN104167710B/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111200277A (en) * | 2020-02-26 | 2020-05-26 | 浙江禾川科技股份有限公司 | Servo driver and overcurrent fault protection circuit thereof |
| WO2021168906A1 (en) * | 2020-02-26 | 2021-09-02 | 浙江禾川科技股份有限公司 | Servo driver and overcurrent fault protection circuit therefor |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104167710A (en) | 2014-11-26 |
| CN106253206B (en) | 2018-12-04 |
| CN104167710B (en) | 2017-11-10 |
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