CN102957133B - The IGBT of frequency converter moves back full protective circuit - Google Patents
The IGBT of frequency converter moves back full protective circuit Download PDFInfo
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- CN102957133B CN102957133B CN201210410266.4A CN201210410266A CN102957133B CN 102957133 B CN102957133 B CN 102957133B CN 201210410266 A CN201210410266 A CN 201210410266A CN 102957133 B CN102957133 B CN 102957133B
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- 230000001681 protective effect Effects 0.000 title claims abstract description 39
- 238000001514 detection method Methods 0.000 claims abstract description 18
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- 238000002955 isolation Methods 0.000 claims abstract description 13
- 238000012544 monitoring process Methods 0.000 claims description 4
- 230000002159 abnormal effect Effects 0.000 claims 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 2
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- 238000010586 diagram Methods 0.000 description 2
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- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000008280 blood Substances 0.000 description 1
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- 230000015556 catabolic process Effects 0.000 description 1
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Abstract
The IGBT that the invention provides a kind of frequency converter moves back full protective circuit; comprise main circuit topological structure; also comprise connect main circuit topological structure inverter bridge IGBT, inverter bridge IGBT drive singal power isolation and amplifying circuit, the lockout circuit of inverter bridge IGBT drive singal; also comprise overcurrent protection IGBT, flow tube drives and protective circuit, flow tube Uce detects and comparison circuit, flow tube move back saturation detection circuit, described overcurrent protection IGBT is serially connected on the bus of main circuit topological structure.Corresponding method is also provided.The present invention has parameter stability, wiring and debugs the advantages such as simple, element quality is reliable; inverter bridge IGBT can not only be protected; also can protect other power components on DC bus simultaneously; as rectifier bridge etc., prevent from causing rectifier bridge damage or pcb board primary circuit Copper Foil to burn because DC bus current is out of control.
Description
Technical field
What the present invention relates to a kind of IGBT moves back full resist technology field, and the IGBT particularly relating to the two electrical level inverter of a kind of three-phase moves back full protective circuit and method.
Background technology
When the major loop switching device of inverter selects IGBT, need to move back full protection to IGBT, its objective is after detecting short circuit, in IGBT duration of short circuit allowed to bear, close IGBT, to ensure IGBT safe operation.The method can taked in prior art has:
Method 1, utilize current sensor to detect IGBT electric current and compare with amplitude limit threshold values that to judge whether IGBT moves back full, and reaching disengagement failure electric current to protect the object of IGBT by blocking each road gate drive signal.
Method 2, the use special driving of IGBT and protection IC, as PC929, A316J etc.Collector electrode and the transmitting voltage across poles on-state voltage drop U of on-line monitoring IGBT
ce, once U
ceexceed inner protection threshold values, then reduce gate drive voltage, IGBT soft switching at once, thus disengagement failure electric current.
In said method, method 1 have be simple and easy to realize, hardware drops into little advantage, but its protected effect is limited, practical application finds, method 1 exports very undesirable by protected effect when direct short-circuit at frequency converter.
Method 2 exports by protected effect when direct short-circuit very well (when Protection parameters is suitable) at frequency converter; but the special driving of IGBT and protection IC consumption very large; generally that major loop has several IGBT just to need several special driving and protection IC; drive plate wiring is complicated; and after the special driving in each road and protection IC fault output signal get and obtain; send into CPU and carry out breakdown judge, therefore its maintenance difficulty is relatively large.
In above two kinds of methods, common ground is protective circuit when judging that IGBT has a fault, and the gate drive signal blocking rapidly IGBT reaches the object of protection IGBT.
Summary of the invention
For defect of the prior art, the IGBT that the object of this invention is to provide a kind of frequency converter moves back full protective circuit and circuit.
According to an aspect of the present invention; a kind of IGBT of frequency converter is provided to move back full protective circuit; comprise main circuit topological structure; also comprise connect main circuit topological structure inverter bridge IGBT, inverter bridge IGBT drive singal power isolation and amplifying circuit, the lockout circuit of inverter bridge IGBT drive singal; it is characterized in that, also comprise as lower module:
-overcurrent protection IGBT, described overcurrent protection IGBT is serially connected on the bus of main circuit topological structure;
-flow tube drives and protective circuit, and described flow tube driving and protective circuit connect the grid of described overcurrent protection IGBT, and the CPU module of main circuit topological structure connects described flow tube and drives and protective circuit;
-flow tube Uce detects and comparison circuit, and described flow tube Uce detects and comparison circuit is connected between the collector and emitter of described overcurrent protection IGBT, and the CPU module of main circuit topological structure connects described flow tube Uce and detects and comparison circuit;
-flow tube moves back saturation detection circuit, and described flow tube moves back the collector electrode that saturation detection circuit is connected to described overcurrent protection IGBT, and described flow tube driving and protective circuit connect described flow tube and move back saturation detection circuit.
Preferably, described flow tube drives and protective circuit and flow tube Uce detects and comparison circuit is formed primarily of A316J chip, and the pin of described A316J chip is specially:
-1 pin is connected the flow tube control signal output port of described CPU module with 2 pins;
-11 pins are connected to the grid of overcurrent protection IGBT after crossing first grid resistance Rg1 as the control signal input string of A316J chip;
-6 pins are connected to the fault I/O pin of described CPU module as failure output terminal;
-5 pins are that failure reset end is connected to described CPU module;
-14 pins are connected to described flow tube and move back saturation detection circuit.
Preferably, described flow tube moves back saturation detection circuit and comprises the first resistance R3, fast diode D7 and the first electric capacity C3, and wherein, described first electric capacity C3, the first resistance R3, fast diode D7, overcurrent protection IGBT connect successively.
Preferably, described inverter bridge IGBT drive singal power isolation and amplifying circuit are formed primarily of A3120 chip, 2 pins of described A3120 chip and 3 pins are as driving signal input, and 5 pins of described A3120 chip and 6 pins cross as output string the grid that second grid resistance Rg2 is connected to inverter bridge IGBT.
According to another aspect of the present invention, also provide a kind of IGBT of frequency converter to move back full guard method, it is characterized in that, comprise the steps:
Steps A: frequency converter powers on; After the CPU module detection hardware circuit of main circuit topological structure is without exception, to drive to flow tube and protective circuit sends the signal opening overcurrent protection IGBT; Flow tube drives and protective circuit exports forward grid voltage, opens overcurrent protection IGBT, and the Uce of overcurrent protection IGBT monitored by flow tube Uce detection and comparison circuit simultaneously;
Wherein, described overcurrent protection IGBT is serially connected on the bus of main circuit topological structure, described flow tube driving and protective circuit connect the grid of described overcurrent protection IGBT, described flow tube Uce detects and comparison circuit is connected between the collector and emitter of described overcurrent protection IGBT, and the CPU module of main circuit topological structure connects described flow tube Uce and detects and comparison circuit;
Step B: when output current of frequency converter is abnormal, described flow tube Uce detects and comparison circuit carries out soft switching to overcurrent protection IGBT, meanwhile, flow tube drives and protective circuit exports fault level to described CPU module;
Step C: described CPU module sends fault-signal to the lockout circuit of inverter bridge IGBT drive singal, the isolation of inverter bridge IGBT drive singal power and amplifying circuit are blocked in the lockout circuit of inverter bridge IGBT drive singal at once PWM after receiving fault-signal exports;
Step D: described CPU module detect flow tube drive and protective circuit fault level after at once perform corresponding defence program, and display module failure information simultaneously;
Step e: after user eliminates hardware fault, namely carries out reset operation, and remove fault locking, frequency converter can rerun.
Preferably, described flow tube drives and protective circuit and flow tube Uce detects and comparison circuit is formed primarily of A316J chip, and the pin of described A316J chip is specially:
-1 pin is connected the flow tube control signal output port of described CPU module with 2 pins;
-11 pins are connected to the grid of overcurrent protection IGBT after crossing first grid resistance Rg1 as the control signal input string of A316J chip;
-6 pins are connected to the fault I/O pin of described CPU module as failure output terminal;
-5 pins are that failure reset end is connected to described CPU module;
-14 pins are connected to flow tube and move back saturation detection circuit.
Preferably, described flow tube moves back saturation detection circuit and comprises the first resistance R3, fast diode D7 and the first electric capacity C3, and wherein, described first electric capacity C3, the first resistance R3, fast diode D7, overcurrent protection IGBT connect successively.
Preferably, described inverter bridge IGBT drive singal power isolation and amplifying circuit are formed primarily of A3120 chip, 2 pins of described A3120 chip and 3 pins are as driving signal input, and 5 pins of described A3120 chip and 6 pins cross as output string the grid that second grid resistance Rg2 is connected to inverter bridge IGBT.
Compared with prior art, the present invention has following beneficial effect:
1, the IGBT of frequency converter provided by the invention moves back the advantages such as full protective circuit has parameter stability, wiring and debugging is simple, element quality is reliable;
2, the IGBT of frequency converter provided by the invention moves back full protective circuit and can not only protect inverter bridge IGBT; also can protect other power components on DC bus simultaneously; as rectifier bridge etc., prevent because DC bus current (causing DC bus short circuit as latch-up occurs inverter bridge IGBT) out of control causes rectifier bridge damage or pcb board primary circuit Copper Foil to burn.
Accompanying drawing explanation
By reading the detailed description done non-limiting example with reference to the following drawings, other features, objects and advantages of the present invention will become more obvious:
Fig. 1 is the main circuit topological structure circuit diagram of frequency converter;
Fig. 2 is protective circuit overall structure block diagram;
Fig. 3 is VT1-VT7 gate isolation and drive circuit figure in Fig. 1.
Fig. 4 is that in Fig. 1, VT8 gate isolation drives and moves back full testing circuit figure.
In Fig. 1: the two-level inverter that VT1-VT6 is made up of 6 IGBT; VT8 is overcurrent protection IGBT;
In Fig. 2: 1 is frequency converter human-computer interaction interface (HMI); 2 is frequency converter microprocessor (CPU), and 3 is overcurrent protection IGBT driving and protective circuit, and 4 is that flow tube Uce detects and comparison circuit; 5 is VT1-VT6 drive circuit, and 6 is brake pipe drive circuit.
In Fig. 3: 2,3 pins of A3120 chip are used for PWM input;
In Fig. 4: 1,2 pins of A316J chip are used for the input of flow tube control signal, and 5 pins input for the protection of circuit reset signal, 6 pins are used for module and move back the output of full fault-signal, and 3,4 pins are used for the input of chip operation power supply.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in detail.Following examples will contribute to those skilled in the art and understand the present invention further, but not limit the present invention in any form.It should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, some distortion and improvement can also be made.These all belong to protection scope of the present invention.
Below in conjunction with accompanying drawing, the present invention is described further.As Figure 1-4; the IGBT of the described frequency converter provided according to an aspect of the present invention moves back full protective circuit and comprises the overcurrent protection IGBT (VT8) of a string on the bus of main circuit topological structure and a set of fault detect and decision circuitry and form; main feature of the present invention is: only the overcurrent protection IGBT (VT8) of monitoring string on bus judges whether bus exists fault current, and other inverter bridge IGBT (VT1-VT7) only need simply drive.
The special A3120 chip of employing is amplified in the isolation of the gate drive signal of inverter bridge IGBT (VT1-VT7), 2,3 pins of A3120 chip are driving signal input, 5,6 leads ends are output, this output string crosses the grid G that resistance Rg2 is connected to inverter bridge IGBT (VT1-VT7), as shown in Figure 3.
As shown in Figure 4, adopt A316J chip to drive as the flow tube of overcurrent protection IGBT (VT8) and protective circuit and flow tube Uce detect and comparison circuit, its concrete connected mode is:
The weak electric signal of a, CPU module control overcurrent protection IGBT (VT8) is connected to 1,2 pins of A316J chip; exported by 11 pin after the isolation of A316J chip internal drive singal power and amplifying circuit are amplified, went here and there the grid G being connected to overcurrent protection IGBT (VT8) after resistance Rg1.
The flow tube of b, the first resistance R3, fast diode D7, the first electric capacity C3 formation overcurrent protection IGBT (VT8) moves back saturation detection circuit, wherein, to be the fine-tuning first resistance R3 of IGBT for different qualities best move back full protection point to find in the effect of the first resistance R3; Fast diode D7 is for blocking high pressure; First electric capacity C3 is Uce filtering, prevents protective circuit misoperation.
6 pin of c, A316J chip are that fault exports, and this signal is connected to CPU module fault I/O pin, move back full response in time for CPU to IGBT.
5 pin of d, A316J are failure reset, and when after IGBT Failure elimination, CPU is resetted to A316J by this pin.
There is provided a kind of IGBT of frequency converter to move back the guard method of full protective circuit according to another aspect of the present invention, comprise the following steps:
Steps A: frequency converter powers on; After the CPU module detection hardware circuit of main circuit topological structure is without exception, to drive to flow tube and protective circuit sends the signal opening overcurrent protection IGBT (VT8); A316J chip exports forward grid voltage, opens overcurrent protection IGBT (VT8), and monitors the Uce of overcurrent protection IGBT (VT8) simultaneously;
Step B: when output current of frequency converter is abnormal, because bus current is greater than three-phase output current (about 1.35 times), overcurrent protection IGBT (VT8) compares other IGBT (VT1-VT7) and more easily exits saturation region, now the described flow tube Uce of A316J chip internal detects and comparison circuit carries out soft switching (falling grid voltage until it turns off completely) to overcurrent protection IGBT, meanwhile, A316J failure of chip output pin (6 pin) exports fault level to described CPU module;
Step C: described CPU module sends fault-signal to the lockout circuit of inverter bridge IGBT drive singal, the six road PWM at once blocking the isolation of inverter bridge IGBT drive singal power and amplifying circuit after the lockout circuit of inverter bridge IGBT drive singal receives fault-signal export, protection inverter bridge IGBT;
Step D: at once perform corresponding defence program after described CPU module detects the fault level of A316J chip, and display module failure information simultaneously;
Step e: after user eliminates hardware fault, can in the enterprising horizontal reset operation of HMI, and remove fault locking, frequency converter can rerun.
Below in conjunction with a specific embodiment, the present invention is further described.
In figure 3, the gate driver circuit of inversion and braking inverter bridge IGBT (VT1-VT7) is made up of A3120 chip.2 of A3120 chip, 3 pins are driving signal input, the anode of the corresponding interior light emitting diodes of 2 pin, the negative electrode of the corresponding interior light emitting diodes of 3 pin, 5, 6 pins are all output, this output string crosses the grid G that resistance is connected to inverter bridge IGBT (VT1-VT7), when the drive singal from control board makes its 2 pin voltage higher than 3 pin 2V, A3120 chip enters opens IGBT state, they are 5 years old, 6 pin export high level, then the IGBT of its correspondence is opened, when its 2 pin voltage is less than or equal to 3 pin voltage, A3120 chip enters and turns off IGBT state, they are 5 years old, 6 pin output low levels, then the IGBT of its correspondence is turned off.
It should be appreciated by those skilled in the art that other pin of described A316J chip and A3120 chip can carry out necessary connection according to prior art (DATDSHEET of such as chip) and actual needs, do not repeat them here.
Above specific embodiments of the invention are described.It is to be appreciated that the present invention is not limited to above-mentioned particular implementation, those skilled in the art can make various distortion or amendment within the scope of the claims, and this does not affect flesh and blood of the present invention.
Claims (8)
1. the IGBT of a frequency converter moves back full protective circuit; comprise main circuit topological structure; also comprise connect main circuit topological structure inverter bridge IGBT, inverter bridge IGBT drive singal power isolation and amplifying circuit, the lockout circuit of inverter bridge IGBT drive singal; it is characterized in that, also comprise as lower module:
-overcurrent protection IGBT, described overcurrent protection IGBT is serially connected on the bus of main circuit topological structure;
-flow tube drives and protective circuit, and described flow tube driving and protective circuit connect the grid of described overcurrent protection IGBT, and the CPU module of main circuit topological structure connects described flow tube and drives and protective circuit;
-flow tube Uce detects and comparison circuit, and described flow tube Uce detects and comparison circuit is connected between the collector and emitter of described overcurrent protection IGBT, and the CPU module of main circuit topological structure connects described flow tube Uce and detects and comparison circuit;
-flow tube moves back saturation detection circuit, and described flow tube moves back the collector electrode that saturation detection circuit is connected to described overcurrent protection IGBT, and described flow tube driving and protective circuit connect described flow tube and move back saturation detection circuit;
The IGBT of described frequency converter moves back full protective circuit, and only the overcurrent protection IGBT of monitoring string on bus judges whether bus exists fault current, does not monitor inverter bridge IGBT;
Uce represents the voltage on-state voltage drop between the collector and emitter of overcurrent protection IGBT.
2. the IGBT of frequency converter according to claim 1 moves back full protective circuit, it is characterized in that, described flow tube drives and protective circuit and flow tube Uce detects and comparison circuit is formed primarily of A316J chip, and the pin of described A316J chip is specially:
-1 pin is connected the flow tube control signal output port of described CPU module with 2 pins;
-11 pins are connected to the grid of overcurrent protection IGBT after crossing first grid resistance Rg1 as the control signal input string of A316J chip;
-6 pins are connected to the fault I/O pin of described CPU module as failure output terminal;
-5 pins are that failure reset end is connected to described CPU module;
-14 pins are connected to described flow tube and move back saturation detection circuit.
3. the IGBT of frequency converter according to claim 1 moves back full protective circuit; it is characterized in that; described flow tube moves back saturation detection circuit and comprises the first resistance R3, fast diode D7 and the first electric capacity C3; wherein, described first electric capacity C3, the first resistance R3, fast diode D7, overcurrent protection IGBT connect successively.
4. the IGBT of frequency converter according to claim 1 moves back full protective circuit; it is characterized in that; described inverter bridge IGBT drive singal power isolation and amplifying circuit are formed primarily of A3120 chip; 2 pins of described A3120 chip and 3 pins are as driving signal input, and 5 pins of described A3120 chip and 6 pins cross as output string the grid that second grid resistance Rg2 is connected to inverter bridge IGBT.
5. the IGBT of frequency converter moves back a full guard method, it is characterized in that, comprises the steps:
Steps A: frequency converter powers on; After the CPU module detection hardware circuit of main circuit topological structure is without exception, to drive to flow tube and protective circuit sends the signal opening overcurrent protection IGBT; Flow tube drives and protective circuit exports forward grid voltage, opens overcurrent protection IGBT, and the Uce of overcurrent protection IGBT monitored by flow tube Uce detection and comparison circuit simultaneously;
Wherein, described overcurrent protection IGBT is serially connected on the bus of main circuit topological structure, described flow tube driving and protective circuit connect the grid of described overcurrent protection IGBT, described flow tube Uce detects and comparison circuit is connected between the collector and emitter of described overcurrent protection IGBT, and the CPU module of main circuit topological structure connects described flow tube Uce and detects and comparison circuit;
Step B: when output current of frequency converter is abnormal, described flow tube Uce detects and comparison circuit carries out soft switching to overcurrent protection IGBT, meanwhile, flow tube drives and protective circuit exports fault level to described CPU module;
Step C: described CPU module sends fault-signal to the lockout circuit of inverter bridge IGBT drive singal, the isolation of inverter bridge IGBT drive singal power and amplifying circuit are blocked in the lockout circuit of inverter bridge IGBT drive singal at once PWM after receiving fault-signal exports;
Step D: described CPU module detect flow tube drive and protective circuit fault level after at once perform corresponding defence program, and display module failure information simultaneously;
Step e: after user eliminates hardware fault, namely carries out reset operation, and remove fault locking, frequency converter can rerun;
The IGBT of described frequency converter moves back full guard method, and only the overcurrent protection IGBT of monitoring string on bus judges whether bus exists fault current, does not monitor inverter bridge IGBT;
Uce represents the voltage on-state voltage drop between the collector and emitter of overcurrent protection IGBT.
6. the IGBT of frequency converter according to claim 5 moves back full guard method, it is characterized in that, described flow tube drives and protective circuit and flow tube Uce detects and comparison circuit is formed primarily of A316J chip, and the pin of described A316J chip is specially:
-1 pin is connected the flow tube control signal output port of described CPU module with 2 pins;
-11 pins are connected to the grid of overcurrent protection IGBT after crossing first grid resistance Rg1 as the control signal input string of A316J chip;
-6 pins are connected to the fault I/O pin of described CPU module as failure output terminal;
-5 pins are that failure reset end is connected to described CPU module;
-14 pins are connected to flow tube and move back saturation detection circuit.
7. the IGBT of frequency converter according to claim 6 moves back full guard method; it is characterized in that; described flow tube moves back saturation detection circuit and comprises the first resistance R3, fast diode D7 and the first electric capacity C3; wherein, described first electric capacity C3, the first resistance R3, fast diode D7, overcurrent protection IGBT connect successively.
8. the IGBT of frequency converter according to claim 5 moves back full guard method; it is characterized in that; described inverter bridge IGBT drive singal power isolation and amplifying circuit are formed primarily of A3120 chip; 2 pins of described A3120 chip and 3 pins are as driving signal input, and 5 pins of described A3120 chip and 6 pins cross as output string the grid that second grid resistance Rg2 is connected to inverter bridge IGBT.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210410266.4A CN102957133B (en) | 2012-10-24 | 2012-10-24 | The IGBT of frequency converter moves back full protective circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210410266.4A CN102957133B (en) | 2012-10-24 | 2012-10-24 | The IGBT of frequency converter moves back full protective circuit |
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| Publication Number | Publication Date |
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| CN102957133A CN102957133A (en) | 2013-03-06 |
| CN102957133B true CN102957133B (en) | 2016-04-13 |
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| CN201210410266.4A Expired - Fee Related CN102957133B (en) | 2012-10-24 | 2012-10-24 | The IGBT of frequency converter moves back full protective circuit |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104467379B (en) * | 2014-12-30 | 2017-11-24 | 郭智峰 | The switch tube driving circuit of bridge switch topology |
| CN110445100B (en) * | 2019-07-22 | 2024-07-19 | 江苏云意电气股份有限公司 | IGBT desaturation protection and drive power supply undervoltage protection circuit |
| CN110460021B (en) * | 2019-08-15 | 2022-02-25 | 海信（山东）空调有限公司 | IGBT protection circuit and air conditioner |
| CN113595536A (en) * | 2021-06-17 | 2021-11-02 | 许继集团有限公司 | IGBT active overcurrent protection device and protection method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101399491A (en) * | 2007-11-06 | 2009-04-01 | 中国科学院电工研究所 | Overcurrent protection circuit for photovoltaic DC-to-AC converter |
| CN201656898U (en) * | 2009-12-28 | 2010-11-24 | 南昌大学 | AC asynchronous motor vector controller |
| CN102332705A (en) * | 2011-10-25 | 2012-01-25 | 杭州日鼎控制技术有限公司 | Short-circuit protection circuit of insulated gate bipolar translator (IGBT) of high-power frequency conversion device |
| CN202957584U (en) * | 2012-10-24 | 2013-05-29 | 上海神源电气有限公司 | IGBT saturation retreating protection circuit for frequency converter |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3605269B2 (en) * | 1997-10-02 | 2004-12-22 | 三菱電機株式会社 | Inverter protection device |
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2012
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101399491A (en) * | 2007-11-06 | 2009-04-01 | 中国科学院电工研究所 | Overcurrent protection circuit for photovoltaic DC-to-AC converter |
| CN201656898U (en) * | 2009-12-28 | 2010-11-24 | 南昌大学 | AC asynchronous motor vector controller |
| CN102332705A (en) * | 2011-10-25 | 2012-01-25 | 杭州日鼎控制技术有限公司 | Short-circuit protection circuit of insulated gate bipolar translator (IGBT) of high-power frequency conversion device |
| CN202957584U (en) * | 2012-10-24 | 2013-05-29 | 上海神源电气有限公司 | IGBT saturation retreating protection circuit for frequency converter |
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