CN202957584U - IGBT saturation retreating protection circuit for frequency converter - Google Patents
IGBT saturation retreating protection circuit for frequency converter Download PDFInfo
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- CN202957584U CN202957584U CN 201220547098 CN201220547098U CN202957584U CN 202957584 U CN202957584 U CN 202957584U CN 201220547098 CN201220547098 CN 201220547098 CN 201220547098 U CN201220547098 U CN 201220547098U CN 202957584 U CN202957584 U CN 202957584U
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Abstract
The utility model provides an IGBT saturation retreating protection circuit for a frequency converter, comprising a main circuit topology structure, also comprising an inverter bridge IGBT connected with the main circuit topology structure, an inverter bridge IGBT driving signal power isolation and amplification circuit, an inverter bridge IGBT driving signal locking circuit, an over-current protection IGBT, an over-current tube driving and protection circuit, an over-current tube Uce detection and comparison circuit, and an over-current saturation retreating and detecting circuit, wherein the over-current protection IGBT is serially connected with the bus of the main circuit topology structure. The utility mode also provides a corresponding method. The IGBT saturation retreating protection circuit for a frequency converter has the advantages of being stable in parameter, simple in wiring and debugging, and reliable in component quality, etc., and not only can protect the inverter bridge IGBT, but also can protect other power components on the DC bus, such as a rectifier bridge, etc., thereby preventing the rectifier bridge from being damaged or the primary loop copper foil of a PCB from being burnt out due to the out of control of the current of the DC bus.
Description
Technical field
The utility model relates to the full resist technology field of moving back of a kind of IGBT, and 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 be moved back full protection to IGBT, after its objective is and detecting short circuit, be closed IGBT in IGBT duration of short circuit allowed to bear, to guarantee the IGBT safe operation.The method that can take in prior art has:
Method 1, utilize current sensor to detect the IGBT electric current and relatively to judge whether IGBT moves back full with the amplitude limit threshold values, and reach the purpose of disengagement failure electric current with protection IGBT by blocking each road gate drive signal.
In said method, method 1 has the realization of being simple and easy to, hardware drops into little advantage, but its protection effect is limited, the practical application discovery, and method 1 is in the situation that frequency converter output is very undesirable by direct short-circuit protection effect.
In above two kinds of methods, common ground is that protective circuit is judged when IGBT has fault, and the gate drive signal that blocks rapidly IGBT reaches the purpose of protection IGBT.
The utility model content
For defect of the prior art, the IGBT that the purpose of this utility model is to provide a kind of frequency converter moves back full protective circuit and circuit.
According to an aspect of the present utility model; provide a kind of IGBT of frequency converter to move back full protective circuit; comprise main circuit topological structure; also comprise that the inverter bridge IGBT, the inverter bridge IGBT that connect main circuit topological structure drive signal power isolation and amplifying circuit, inverter bridge IGBT to drive the signal lockout circuit; 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 driving and protective circuit and flow tube Uce detect and comparison circuit mainly consists of the 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 crossed after first grid resistance R g1 the grid that is connected to overcurrent protection IGBT 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 signal power isolation and amplifying circuit mainly to consist 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 cross as the output string grid that second grid resistance R g2 is connected to inverter bridge IGBT.
According to another aspect of the present utility model, 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, without after abnormal, sends to flow tube driving and protective circuit the signal of opening overcurrent protection IGBT; 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 is abnormal, described flow tube Uce detects 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 send fault-signal to inverter bridge IGBT, and inverter bridge IGBT blocks the PWM output that inverter bridge IGBT drives signal power isolation and amplifying circuit at once after driving the signal lockout circuit to receive 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, 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 consists of the 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 crossed after first grid resistance R g1 the grid that is connected to overcurrent protection IGBT 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 signal power isolation and amplifying circuit mainly to consist 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 cross as the output string grid that second grid resistance R g2 is connected to inverter bridge IGBT.
Compared with prior art, the utlity model has following beneficial effect:
The IGBT of the frequency converter that 1, the utility model provides moves back the advantages such as full protective circuit has parameter stability, wiring and debugging is simple, element quality is reliable;
The IGBT of the frequency converter that 2, the utility model provides moves back full protective circuit not only can protect inverter bridge IGBT; 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 of DC bus current (as latch-up occurs inverter bridge IGBT, causing the DC bus short circuit) out of control.
The accompanying drawing explanation
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 utility model will become:
The main circuit topological structure circuit diagram that Fig. 1 is 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, the VT8 gate isolation drives and move back full testing circuit figure.
In Fig. 1: the two-level inverter that VT1-VT6 is comprised of 6 IGBT; VT8 is overcurrent protection IGBT;
In 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.
In Fig. 3: 2,3 pins of A3120 chip are for the PWM input;
In Fig. 4: 1,2 pins of A316J chip are 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 move back full fault-signal output for module, and 3,4 pins are for the input of chip operation power supply.
Embodiment
Below in conjunction with specific embodiment, the utility model is elaborated.Following examples will contribute to those skilled in the art further to understand the utility model, but not limit in any form the utility model.It should be pointed out that to those skilled in the art, without departing from the concept of the premise utility, can also make some distortion and improvement.These all belong to protection range of the present utility model.
Below in conjunction with accompanying drawing, the utility model is described further.As Figure 1-4; the IGBT of the described frequency converter provided according to an aspect of the present utility model 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 composition; the utility model main feature 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; by 11 pin outputs, went here and there after resistance Rg1 and be connected to overcurrent protection IGBT(VT8 after the A316J chip internal drives signal power isolation and amplifying circuit to amplify) grid G.
B, the first resistance R 3, fast diode D7, the first capacitor C 3 form 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 for blocking 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 to full response in time.
5 pin of d, A316J are failure reset, and after the IGBT Failure elimination, CPU resets to A316J by this pin.
According to another aspect of the present utility model, provide a kind of IGBT of frequency converter to move back the guard method of full protective circuit, comprise the following steps:
Steps A: frequency converter powers on; The CPU module detection hardware circuit of main circuit topological structure is without after abnormal, to flow tube drive and protective circuit send open overcurrent protection IGBT(VT8) signal; A316J chip output forward grid voltage, open overcurrent protection IGBT(VT8), and monitor overcurrent protection IGBT(VT8 simultaneously) Uce;
Step B: when the frequency converter output current is abnormal, because bus current is greater than three-phase output current (approximately 1.35 times), overcurrent protection IGBT(VT8) compare other IGBT (VT1-VT7) and more easily exit saturation region, now described flow tube Uce detection and the comparison circuit of A316J chip internal carry 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 send fault-signal to inverter bridge IGBT, inverter bridge IGBT blocks the six road PWM outputs that inverter bridge IGBT drives signal power isolation and amplifying circuit at once, protection inverter bridge IGBT after driving the signal lockout circuit to receive fault-signal;
Step D: described CPU module is carried out corresponding defence program at once after the fault level of A316J chip being detected, 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.
Below in conjunction with a specific embodiment, the utility model is further illustrated.
In Fig. 3, inversion and braking inverter bridge IGBT(VT1-VT7) gate driver circuit by the A3120 chip, formed.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 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 during less than or equal to 3 pin voltage, the A3120 chip enters the IGBT state that turn-offs, they are 5 years old, 6 pin output low levels, then turn-off its corresponding IGBT.
Other pin that it should be appreciated by those skilled in the art that described A316J chip and A3120 chip can for example, carry out necessary connection according to prior art (DATDSHEET of chip) and actual needs, does not repeat them here.
Above specific embodiment of the utility model is described.It will be appreciated that, the utility model is not limited to above-mentioned specific implementations, and 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 utility model.
Claims (4)
1. the IGBT of a frequency converter moves back full protective circuit; comprise main circuit topological structure; also comprise that the inverter bridge IGBT, the inverter bridge IGBT that connect main circuit topological structure drive signal power isolation and amplifying circuit, inverter bridge IGBT to drive the signal lockout circuit; 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.
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 consists of the 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 crossed after first grid resistance R g1 the grid that is connected to overcurrent protection IGBT 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 signal power isolation and amplifying circuit mainly to consist 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 cross as the output string grid that second grid resistance R g2 is connected to inverter bridge IGBT.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220547098 CN202957584U (en) | 2012-10-24 | 2012-10-24 | IGBT saturation retreating protection circuit for frequency converter |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220547098 CN202957584U (en) | 2012-10-24 | 2012-10-24 | IGBT saturation retreating protection circuit for frequency converter |
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| Publication Number | Publication Date |
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| CN202957584U true CN202957584U (en) | 2013-05-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220547098 Expired - Lifetime CN202957584U (en) | 2012-10-24 | 2012-10-24 | IGBT saturation retreating protection circuit for frequency converter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102957133A (en) * | 2012-10-24 | 2013-03-06 | 上海神源电气有限公司 | IGBT (Insulated Gate Bipolar Translator) over-current withdraw protection circuit of frequency converter |
| CN108233687A (en) * | 2018-03-13 | 2018-06-29 | 南京双启新能源科技有限公司 | It is a kind of to insert type IGBT half-bridge special purpose drivers |
-
2012
- 2012-10-24 CN CN 201220547098 patent/CN202957584U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102957133A (en) * | 2012-10-24 | 2013-03-06 | 上海神源电气有限公司 | IGBT (Insulated Gate Bipolar Translator) over-current withdraw protection circuit of frequency converter |
| CN102957133B (en) * | 2012-10-24 | 2016-04-13 | 上海神源电气有限公司 | The IGBT of frequency converter moves back full protective circuit |
| CN108233687A (en) * | 2018-03-13 | 2018-06-29 | 南京双启新能源科技有限公司 | It is a kind of to insert type IGBT half-bridge special purpose drivers |
| CN108233687B (en) * | 2018-03-13 | 2023-11-21 | 南京双启新能源科技有限公司 | Plug-in IGBT half-bridge special driver |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130529 |
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| CX01 | Expiry of patent term |