CN102957133A - IGBT (Insulated Gate Bipolar Translator) over-current withdraw protection circuit of frequency converter - Google Patents
IGBT (Insulated Gate Bipolar Translator) over-current withdraw protection circuit of frequency converter Download PDFInfo
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- CN102957133A CN102957133A CN2012104102664A CN201210410266A CN102957133A CN 102957133 A CN102957133 A CN 102957133A CN 2012104102664 A CN2012104102664 A CN 2012104102664A CN 201210410266 A CN201210410266 A CN 201210410266A CN 102957133 A CN102957133 A CN 102957133A
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Abstract
The invention provides an IGBT (Insulated Gate Bipolar Translator) over-current withdraw protection circuit of a frequency converter. The IGBT over-current withdraw protection circuit comprises a main circuit topology structure, and an inverter bridge IGBT, an inverter bridge IGBT driving signal power insulating and amplifying circuit and an inverter bridge IGBT driving signal blocking circuit which are connected with the main circuit topology structure, as well as an over-current protection IGBT, an over-current tube driving and protecting circuit, an over-current tube Uce detecting and comparing circuit and an over-current tube withdraw and detecting circuit, wherein the over-current protection IGBT is connected with a bus of the main circuit topology structure in series. The invention further provides a corresponding method. The IGBT over-current withdraw protection circuit provided by the invention has the advantages of stable parameter, simple wire arrangement and debugging, reliable element quality and the like, and can protect not only the inverter bridge IGBT, but also the other power elements, such as a rectifying bridge, on the direct-current bus. Therefore, the rectifying bridge is prevented from being damaged or copper foil of a primary loop of a PCB (Printed Circuit Board) can be prevented from being burnt due to that current of the direct-current bus is out of control.
Description
Technical field
The present invention relates to the full resist technology field of moving back of a kind of IGBT, the IGBT that relates in particular to the two electrical level inverters of a kind of three-phase moves back full protective circuit and method.
Background technology
When the major loop switching device of inverter is selected IGBT, need to move back full protection to IGBT, its objective is detect short circuit after, in IGBT duration of short circuit allowed to bear, close IGBT, to guarantee the IGBT safe operation.The method that can take in the prior art has:
Method 1, utilize current sensor to detect the IGBT electric current and to judge relatively whether IGBT moves back full with the amplitude limit threshold values, and reach the disengagement failure electric current with the purpose of protection IGBT by blocking each road gate drive signal.
In the said method, method 1 have be simple and easy to realize, hardware drops into little advantage, but its protection effect is limited, practical application finds, method 1 frequency converter output by the situation of direct short-circuit under the protection effect very undesirable.
More than in two kinds of methods, common ground is that protective circuit is judged when IGBT has fault, the gate drive signal that blocks rapidly IGBT reaches the purpose of protection IGBT.
Summary of the invention
For defective of the prior art, the IGBT that the purpose 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; provide a kind of IGBT of frequency converter to move back full protective circuit; comprise main circuit topological structure; comprise that also the inverter bridge IGBT, the inverter bridge IGBT that connect main circuit topological structure drive signal power isolation and amplifying circuit, inverter bridge IGBT drives the signal lockout circuit; it is characterized in that, also comprise such 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 driving and protective circuit and flow tube Uce detect and comparison circuit mainly is made of the A316J chip, and the pin of described A316J chip is specially:
-1 pin with are connected pin and connect the flow tube control signal output port of described CPU module;
-11 pins are crossed the grid that is connected to overcurrent protection IGBT behind the first grid resistance R g1 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 the 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 R 3, fast diode D7 and the first capacitor C 3, and wherein, described the first capacitor C 3, the first resistance R 3, fast diode D7, overcurrent protection IGBT connect successively.
Preferably, described inverter bridge IGBT drives the signal power isolation and amplifying circuit mainly is made of the 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 are crossed the grid that second grid resistance R g2 is connected to inverter bridge IGBT as the output string.
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; The CPU module detection hardware circuit of main circuit topological structure sends the signal of opening overcurrent protection IGBT without after unusual to flow tube driving and protective circuit; Flow tube drives and protective circuit output forward grid voltage, opens overcurrent protection IGBT, and flow tube Uce detection and comparison circuit are monitored the Uce of overcurrent protection IGBT 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 the frequency converter output current was unusual, described flow tube Uce detected and comparison circuit carries out soft shutoff to overcurrent protection IGBT, and meanwhile, flow tube drives and protective circuit is exported the fault level to described CPU module;
Step C: described CPU module drives the signal lockout circuit to inverter bridge IGBT and sends fault-signal, and inverter bridge IGBT drives and blocks the PWM output that inverter bridge IGBT drives signal power isolation and amplifying circuit at once after the signal lockout circuit receives fault-signal;
Step D: described CPU module detect that flow tube drives and the fault level of protective circuit after carry out corresponding defence program at once, and display module failure information simultaneously;
Step e: after the user has got rid of hardware fault, namely carry out reset operation, remove fault locking, frequency converter can rerun.
Preferably, described flow tube driving and protective circuit and flow tube Uce detect and comparison circuit mainly is made of the A316J chip, and the pin of described A316J chip is specially:
-1 pin with are connected pin and connect the flow tube control signal output port of described CPU module;
-11 pins are crossed the grid that is connected to overcurrent protection IGBT behind the first grid resistance R g1 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 the 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 R 3, fast diode D7 and the first capacitor C 3, and wherein, described the first capacitor C 3, the first resistance R 3, fast diode D7, overcurrent protection IGBT connect successively.
Preferably, described inverter bridge IGBT drives the signal power isolation and amplifying circuit mainly is made of the 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 are crossed the grid that second grid resistance R g2 is connected to inverter bridge IGBT as the output string.
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 not only can protect inverter bridge IGBT; also can protect simultaneously other power components on the dc bus; such as rectifier bridge etc., prevent from causing rectifier bridge damage or pcb board primary circuit Copper Foil to burn because of dc bus current (such as inverter bridge IGBT latch-up occurs and cause the dc bus short circuit) out of control.
Description of drawings
By reading the detailed description of non-limiting example being done with reference to the following drawings, it is more obvious that other features, objects and advantages of the present invention will become:
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 among Fig. 1.
Fig. 4 is that the VT8 gate isolation drives and move back full testing circuit figure among Fig. 1.
Among Fig. 1: the two-level inverter that VT1-VT6 is comprised of 6 IGBT; VT8 is overcurrent protection IGBT;
Among Fig. 2: 1 is frequency converter human-computer interaction interface (HMI), and 2 is frequency converter microprocessor (CPU), and 3 for overcurrent protection IGBT drives and protective circuit, and 4 for flow tube Uce detects and comparison circuit, and 5 is the VT1-VT6 drive circuit, and 6 is the brake pipe drive circuit.
Among Fig. 3: 2,3 pins of A3120 chip are used for the PWM input;
Among Fig. 4: 1,2 pins of A316J chip are used for the input of flow tube control signal, and 5 pins are for the protection of the input of circuit reset signal, and 6 pins are used for module and move back full fault-signal output, and 3,4 pins are used for the input of chip operation power supply.
Embodiment
The present invention is described in detail below in conjunction with specific embodiment.Following examples will help those skilled in the art further to understand the present invention, but not limit in any form the present invention.Should be pointed out that to those skilled in the art, without departing from the inventive concept of the premise, can also make some distortion and improvement.These all belong to protection scope of the present invention.
Below in conjunction with accompanying drawing the present invention is described further.Shown in Fig. 1-4; the IGBT of the described frequency converter that provides 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 detects and decision circuitry forms; main feature of the present invention is: only monitor the overcurrent protection IGBT(VT8 of string on bus) judge whether bus exists fault current, other inverter bridge IGBT(VT1-VT7) only need simple driving to get final product.
The special-purpose A3120 chip of employing is amplified in the isolation of gate drive signal inverter bridge IGBT(VT1-VT7), 2,3 pins of A3120 chip are driving signal input, 5,6 leads ends are output, this output string is crossed resistance Rg2 and is connected to inverter bridge IGBT(VT1-VT7) grid G, as shown in Figure 3.
As shown in Figure 4, adopt the A316J chip as overcurrent protection IGBT(VT8) flow tube driving and protective circuit and flow tube Uce detect and comparison circuit, its concrete connected mode is:
A, CPU module controls overcurrent protection IGBT(VT8) weak electric signal be connected to 1,2 pins of A316J chip; after the A316J chip internal drives signal power isolation and amplifying circuit and amplifies, by the output of 11 pin, went here and there and be connected to overcurrent protection IGBT(VT8 behind the resistance Rg1) grid G.
B, the first resistance R 3, fast diode D 7, the first capacitor C 3 consist of overcurrent protection IGBT(VT8) flow tube move back saturation detection circuit, wherein, the effect of the first resistance R 3 is for fine-tuning the first resistance R 3 of the IGBT of different qualities in order to find the best full protection point that moves back; Fast diode D7 is used for the blocking-up high pressure; The first capacitor C 3 is Uce filtering, prevents the protective circuit misoperation.
6 pin of c, A316J chip are fault output, and this signal is connected to CPU module failure I/O pin, for CPU IGBT are moved back full in time response.
5 pin of d, A316J are failure reset, and behind the IGBT Failure elimination, CPU resets to A316J by this pin.
Provide according to another aspect of the present invention a kind of IGBT of frequency converter to move back the guard method of full protective circuit, may further comprise the steps:
Steps A: frequency converter powers on; The CPU module detection hardware circuit of main circuit topological structure is without after unusual, to flow tube drive and protective circuit send open overcurrent protection IGBT(VT8) signal; A316J chip output forward grid voltage is opened overcurrent protection IGBT(VT8), and monitor simultaneously overcurrent protection IGBT(VT8) Uce;
Step B: when the frequency converter output current is unusual, because bus current is greater than three-phase output current (about 1.35 times), overcurrent protection IGBT(VT8) compares the easier saturation region that withdraws from of other IGBT (VT1-VT7), this moment, described flow tube Uce detection and the comparison circuit of A316J chip internal carried out soft shutoff (falling grid voltage until it turn-offs fully) to overcurrent protection IGBT, meanwhile, A316J failure of chip output pin (6 pin) is to described CPU module output fault level;
Step C: described CPU module drives the signal lockout circuit to inverter bridge IGBT and sends fault-signal, inverter bridge IGBT drives and blocks six road PWM output that inverter bridge IGBT drives signal power isolation and amplifying circuit at once, protection inverter bridge IGBT after the signal lockout circuit receives fault-signal;
Step D: described CPU module is carried out corresponding defence program at once after detecting the fault level of A316J chip, and display module failure information simultaneously;
Step e: after the user has got rid of hardware fault, can remove fault locking in the enterprising horizontal reset operation of HMI, frequency converter can rerun.
The present invention is further described below in conjunction with a specific embodiment.
In Fig. 3, inversion and braking inverter bridge IGBT(VT1-VT7) gate driver circuit formed by the 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 is crossed resistance and is connected to inverter bridge IGBT(VT1-VT7) grid G, when the driving signal from control board makes its 2 pin voltage be higher than 3 pin 2V, the A3120 chip enters the IGBT state of opening, they are 5 years old, 6 pin output high level, then open its corresponding IGBT, when its 2 pin voltage was less than or equal to 3 pin voltage, the A3120 chip entered the IGBT state that turn-offs, they are 5 years old, 6 pin output low levels are turn-offed its corresponding IGBT then.
Other pin that it should be appreciated by those skilled in the art that described A316J chip and A3120 chip can carry out necessary connection according to prior art (for example DATDSHEET of chip) with actual needs, do not repeat them here.
More than specific embodiments of the invention are described.It will be appreciated that the present invention is not limited to above-mentioned particular implementation, those skilled in the art can make various distortion or modification 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; comprise that also the inverter bridge IGBT, the inverter bridge IGBT that connect main circuit topological structure drive signal power isolation and amplifying circuit, inverter bridge IGBT drives the signal lockout circuit; it is characterized in that, also comprise such 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.
2. the IGBT of frequency converter according to claim 1 moves back full protective circuit, it is characterized in that, described flow tube driving and protective circuit and flow tube Uce detect and comparison circuit mainly is made of the A316J chip, and the pin of described A316J chip is specially:
-1 pin with are connected pin and connect the flow tube control signal output port of described CPU module;
-11 pins are crossed the grid that is connected to overcurrent protection IGBT behind the first grid resistance R g1 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 the 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 R 3, fast diode D7 and the first capacitor C 3; wherein, described the first capacitor C 3, the first resistance R 3, 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 drives the signal power isolation and amplifying circuit mainly is made of the 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 are crossed the grid that second grid resistance R g2 is connected to inverter bridge IGBT as the output string.
5. the IGBT of a frequency converter moves back full guard method, it is characterized in that, comprises the steps:
Steps A: frequency converter powers on; The CPU module detection hardware circuit of main circuit topological structure sends the signal of opening overcurrent protection IGBT without after unusual to flow tube driving and protective circuit; Flow tube drives and protective circuit output forward grid voltage, opens overcurrent protection IGBT, and flow tube Uce detection and comparison circuit are monitored the Uce of overcurrent protection IGBT 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 the frequency converter output current was unusual, described flow tube Uce detected and comparison circuit carries out soft shutoff to overcurrent protection IGBT, and meanwhile, flow tube drives and protective circuit is exported the fault level to described CPU module;
Step C: described CPU module drives the signal lockout circuit to inverter bridge IGBT and sends fault-signal, and inverter bridge IGBT drives and blocks the PWM output that inverter bridge IGBT drives signal power isolation and amplifying circuit at once after the signal lockout circuit receives fault-signal;
Step D: described CPU module detect that flow tube drives and the fault level of protective circuit after carry out corresponding defence program at once, and display module failure information simultaneously;
Step e: after the user has got rid of hardware fault, namely carry out reset operation, remove fault locking, frequency converter can rerun.
6. the IGBT of frequency converter according to claim 5 moves back full guard method, it is characterized in that, described flow tube driving and protective circuit and flow tube Uce detect and comparison circuit mainly is made of the A316J chip, and the pin of described A316J chip is specially:
-1 pin with are connected pin and connect the flow tube control signal output port of described CPU module;
-11 pins are crossed the grid that is connected to overcurrent protection IGBT behind the first grid resistance R g1 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 the 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 protective circuit; it is characterized in that; described flow tube moves back saturation detection circuit and comprises the first resistance R 3, fast diode D7 and the first capacitor C 3; wherein, described the first capacitor C 3, the first resistance R 3, fast diode D7, overcurrent protection IGBT connect successively.
8. the IGBT of frequency converter according to claim 5 moves back full protective circuit; it is characterized in that; described inverter bridge IGBT drives the signal power isolation and amplifying circuit mainly is made of the 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 are crossed the grid that second grid resistance R g2 is connected to inverter bridge IGBT as the output string.
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| Application Number | Priority Date | Filing Date | Title |
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| 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 |
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| CN201210410266.4A CN102957133B (en) | 2012-10-24 | 2012-10-24 | The IGBT of frequency converter moves back full protective circuit |
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| CN102957133B CN102957133B (en) | 2016-04-13 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104467379B (en) * | 2014-12-30 | 2017-11-24 | 郭智峰 | The switch tube driving circuit of bridge switch topology |
| CN110445100A (en) * | 2019-07-22 | 2019-11-12 | 江苏云意电气股份有限公司 | A kind of IGBT moves back saturation protection and driving power under-voltage protecting circuit |
| CN110460021A (en) * | 2019-08-15 | 2019-11-15 | 海信（山东）空调有限公司 | A kind of 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 |
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| 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 |
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| 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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2012
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| JPH11113163A (en) * | 1997-10-02 | 1999-04-23 | Mitsubishi Electric Corp | Protection device for inverter |
| 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 |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104467379B (en) * | 2014-12-30 | 2017-11-24 | 郭智峰 | The switch tube driving circuit of bridge switch topology |
| CN110445100A (en) * | 2019-07-22 | 2019-11-12 | 江苏云意电气股份有限公司 | A kind of IGBT moves back saturation protection and driving power under-voltage protecting circuit |
| CN110460021A (en) * | 2019-08-15 | 2019-11-15 | 海信（山东）空调有限公司 | A kind of 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 |
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| CN102957133B (en) | 2016-04-13 |
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