CN105071349A - Converter over-current protection and automatic reset circuit - Google Patents
Converter over-current protection and automatic reset circuit Download PDFInfo
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- CN105071349A CN105071349A CN201510574185.1A CN201510574185A CN105071349A CN 105071349 A CN105071349 A CN 105071349A CN 201510574185 A CN201510574185 A CN 201510574185A CN 105071349 A CN105071349 A CN 105071349A
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Abstract
The invention provides a converter over-current protection and automatic reset circuit. The circuit includes a three-phase full-bridge rectification module which is connected with a converter sampling output end and is used for performing rectification processing on current sampling signals, a three-phase unbalance detection module which is connected with the converter sampling output end and is used for detecting the three-phase current unbalance degree of the current sampling signals, an over-current and unbalance degree judgment module which is connected with the three-phase full-bridge rectification module and the three-phase unbalance detection module respectively and is used for judging whether over-current or short circuit occurs on a converter, and a fault signal processing module which is connected with the over-current and unbalance degree judgment module and is used for protecting the circuit when the over-current or short circuit occurs on the converter and making the circuit perform reset processing after the fault is eliminated. With the converter over-current protection and automatic reset circuit adopted, output over-current and short-circuit-to earth protection can be greatly optimized, and a 332J sets a proper short-circuit protection current point, so that an IGBT can comprehensively protect the converter under various over-current and short-circuit conditions.
Description
Technical field
The present invention relates to frequency converter field, particularly relate to a kind of frequency converter overcurrent protection and automatic reset circuit.
Background technology
Frequency converter a kind ofly to click in speed regulation process conventional equipment, for realizing the stepless time adjustment of alternating current machine, is widely used in the every field of national economy.
Present stage, in frequency converter industry, the protection of weak machine short circuit overcurrent is normal uses following two schemes: (1) current detection circuit does current detecting and short-circuit protection; Current signal adds amplifying circuit after device (Hall, current sense resistor etc.) after testing and filter circuit send in CPU process again; (2) bus increases current detection circuit.These two kinds of detection modes, the latter's successful, but cost is higher, and the former efficiency is lower again.Therefore, a kind of efficient, cheap inverter over-current protection circuit is provided, becomes current problem demanding prompt solution.
Summary of the invention
In view of the above problems, the application describes a kind of frequency converter overcurrent protection and automatic reset circuit, and described circuit comprises:
Three phase full bridge rectification module, is connected with frequency converter sampled output, in order to carry out rectification process to current sampling signal;
Three-phase imbalance detection module, is connected with described frequency converter sampled output, in order to detect the three-phase current unbalance degree of described current sampling signal;
Overcurrent and degree of unbalance determination module, be connected with described three-phase imbalance detection module with described three phase full bridge rectification module respectively, for judging whether described frequency converter occurs overcurrent or short circuit;
Fault-signal processing module, is connected with described overcurrent and degree of unbalance determination module, protects during in order to occur overcurrent or short circuit at frequency converter to circuit, and makes described circuit carry out reset processing after fault solves.
Preferably, described current sampling signal input three phase full bridge rectification module, the described output of three phase full bridge rectification module is connected with the input of filtration module, and the output of described filtration module is connected respectively at the in-phase input end of the first comparator in described overcurrent and degree of unbalance determination module and the reverse input end of the second comparator; The in-phase input end of described first comparator is also connected with the output of described three-phase imbalance detection module; The in-phase input end of described second comparator accesses a fixed voltage.
Preferably, described fault-signal processing module comprises the first inverter, the first resistance, the second resistance, the first triode and control board, and the output of described first comparator is connected with the input of described first inverter with the output of described second comparator;
To connect between the output of described first inverter and the base stage of described first triode described first resistance;
The grounded emitter of described first triode;
The collector electrode of described first triode is connected with control board by described second resistance, and described control board is in order to carry out troubleshooting when overcurrent or short circuit appear in described filter.
Preferably, described first triode is insulated gate electrode transistor npn npn.
Preferably, the output of described first comparator, also access the positive pole of the first diode between the output of described second comparator and described first inverter; Described first diode and the 3rd resistant series, described first diode and the second diodes in parallel.
Preferably, described first diode is also connected with optical coupler by one the 4th resistance with the positive pole of described second diode.
Preferably, described 4th resistor coupled in parallel one second inverter and the 5th resistance, described 5th resistance accesses the base stage of the second triode, and the collector electrode of described second triode is connected with described 4th resistance.
Preferably, described first diode is connected with the positive pole of the 4th diode with the 3rd diode of parallel connection with the positive pole of described second diode; Described 3rd diode is all connected with the collector electrode of described second triode with the negative pole of described 4th diode.
Preferably, the collector electrode of described second triode also connects with the 3rd inverter of connecting and the 4th inverter; The output of described 4th inverter is also by a light-emitting diode access fixed voltage.
Preferably, the model of described optical coupler is ACPL-322J.
Technique scheme tool has the following advantages or beneficial effect: this programme optimizes output overcurrent and shorted to earth protection greatly; 332J is arranged and suitable short circuit current protection point; current sampling signal IU/IV/IW is through synthesis; rectification; suitable datum mark is set; achieve IGBT all sidedly to its protection under various overcurrent and short-circuit conditions, it is very reliable and stable that multiparity article batch produces this protective circuit of checking.
Accompanying drawing explanation
With reference to appended accompanying drawing, to describe embodiments of the invention more fully.But, appended accompanying drawing only for illustration of and elaboration, do not form limitation of the scope of the invention.
Fig. 1 is the structural representation of a kind of frequency converter overcurrent protection of the present invention and automatic reset circuit;
Fig. 2 is the partial circuit figure mono-of a kind of frequency converter overcurrent protection of the present invention and automatic reset circuit;
Fig. 3 is the circuit diagram of fault-signal processing module in a kind of frequency converter overcurrent protection of the present invention and automatic reset circuit;
Fig. 4 is the structural representation of optical coupler in a kind of frequency converter overcurrent protection of the present invention and automatic reset circuit.
Embodiment
Below in conjunction with the drawings and specific embodiments, frequency converter overcurrent protection of the present invention and automatic reset circuit are described in detail.
As shown in Figure 1, a kind of frequency converter overcurrent protection and automatic reset circuit, comprising:
Three phase full bridge rectification module, is connected with inverter output terminal, in order to carry out rectification process to current sampling signal; Wherein, described current sampling signal is three-phase current;
Three-phase imbalance detection module, is connected with inverter output terminal, in order to detect the three-phase current unbalance degree of described current sampling signal;
Overcurrent and degree of unbalance determination module, be connected with described three-phase imbalance detection module with described three phase full bridge rectification module respectively, for judging whether frequency converter occurs overcurrent or short circuit;
Fault-signal processing module, is connected with described overcurrent and degree of unbalance determination module, in order to protect circuit when short circuit appears in frequency converter, and makes described fault-signal processing module carry out reset processing after fault solves.
Specifically, as shown in Figure 2, described three phase full bridge rectification module comprises the three phase full bridge that diode D300A, D300B, D301A, D301B, D302A and D302B are formed, and described current sampling signal comprises three-phase current IU, IV and IW.Electric current I U, IV and IW input in described three phase full bridge, carry out rectification process.
Meanwhile, electric current I U, IV and IW also input to described three-phase imbalance detection module.Described three-phase imbalance detection module comprises discharge circuit, and electric current I U, IV and IW access the reverse input end of computing transport and placing device U301A respectively through resistance R236, R237 and R238, the size of resistance R236, R237 and R238 is 2K ohm.In addition, the reverse input end of operational amplifier U301A is also connected with the output of operational amplifier U301A with resistance R329 by electric capacity C325, C326 parallel with one another, and wherein electric capacity C325, C326 is 0.01uF, and resistance R329 is 15K ohm.The rectification of IU, IV and IW three-phase imbalance detection module output signal is delivered to comparator U300A and is judged that whether output is uneven by D303A, D303B.
Overcurrent and degree of unbalance determination module are comparator U300A (the first comparator).Electric current I U, IV and IW after described three phase full bridge process, and are also provided with a low pass filter between described comparator U300A, and described low pass filter comprises electric capacity C310 and C314 in parallel.Resistance R305, resistance R309 are to IU, IV and IW sampled signal dividing potential drop, R303, C310 carry out single order passive filtering to the sampled signal after rectification, R313, C314 and R303, C310 effect is identical, namely carries out the process of single order passive filtering to the sampled signal after rectification.Electric current I U, IV and IW, after rectifying and wave-filtering process, input to the in-phase input end of comparator U300A.Comparator U300A is for detecting the degree of unbalance of output current, and output current whether short circuit over the ground.
In addition, comparator U300B (the second comparator) is also provided with in described circuit, the in-phase input end of U300B accesses a constant current, and the in-phase input end of U300B is all in parallel with electric capacity C303, C309 of ground connection, and electric capacity C309 also connects with a resistance R300.The size of electric capacity C303, C309 is 0.01uF, and resistance R300 is 1K ohm.The reverse input end of comparator U300B is connected with the output of low-pass filtering.
As shown in Figure 3, it is the structural representation of fault-signal processing module.Comparator U300A or U300B outputs signal OC-FO when becoming low level from high level, and the inverter U801A in fault-signal processing module exports high level, triode Q801 conducting, output signal OC-FO upset, and is sent to controller board and processes.The input of inverter U801A (the first inverter) is connected with output signal OC-FO by a resistance R809 (the 3rd resistance).Meanwhile, diode D802A (the first diode) parallel with one another and D802B (the second diode) is also in series with between the output of resistance R809 and comparator U300A, U300B.Also connect between the base stage of inverter U801A and triode Q801 a resistance R810 (the first resistance), the grounded emitter of triode Q801.Meanwhile, resistance R810 is by resistance R811 in parallel and electric capacity C806 ground connection.The collector electrode of triode Q801 accesses a control board by resistance R806 (the second resistance), and described control board is used for carrying out troubleshooting when short circuit or overcurrent appear in frequency converter.In addition, resistance R806 is also by electric capacity C803 ground connection.Triode Q801 can be IGBT (InsulatedGateBipolarTransistor, insulated gate bipolar transistor) in the present invention.
Fault-signal processing module, is connected with the output of D802B with diode D802A (the first diode) in parallel by the output of diode D801A with D801B parallel with one another.In the present invention, fault-signal processing module is photoelectrical coupler ACPL-322J.As shown in Figure 4, it is the structural representation of photoelectrical coupler.3rd pin of ACPL-322J is connected with the input of diode D801A with D801B parallel with one another.Meanwhile, between the 3rd pin of ACPL-322J and the input of diode D801A and D801B parallel with one another, also the emitter of a triode Q800, triode Q800 in parallel is connected with R805 (the 4th resistance).Simultaneously, the base stage of emitter is connected with amplifier U801B (the second inverter), resistance R801 (the 5th resistance), is also in series with electric capacity C801 and the resistance R803 of equal ground connection between the base stage of R801 and Q800 (the second triode).The collector electrode of Q800 is provided with the constant voltage of 5V.In addition, the emitter of triode Q800 (the second triode) also accesses 5V constant voltage by the resistance R802 of series connection and LED 100 and resistance R800.Be in series with two inverter U800A (the 3rd inverter) and U800B (the 4th inverter) between R802 and LED100, amplifier U800A and U800B is all in parallel with diode D800A and diode D800B.
When frequency converter output short-circuit, the 14 pin voltages of ACPL-332J (PC700) are greater than 7V, ACPL-332J blocks the output of IGBT, and the FAULT signal of its 3 pin is dragged down, inverter U801-A exports high level, triode Q801 conducting, FO signal overturns, and is sent to control board and carries out troubleshooting.
After the action of ACPL-332J short-circuit protection, need to allow the complete soft switching IGBT of drive circuit.Malfunction resets being opened signal by the next one after the degradation period of 5us.For making ACPL-332J normal reset, U801-B/Q800 etc. form reset circuit, and when FAULT signal drags down, the output level of U801 is drawn high, Q800 Delayed conducting, and after during final FO signal lag one section, again overturn, DSP lifts a blockade.
After the action of ACPL-332J short-circuit protection, LED indicating circuit meeting action, LED100 indicator light will be always bright, prompting controller generation output short-circuit.
Compared with prior art; this programme optimizes output overcurrent and shorted to earth protection greatly; 332J is arranged and suitable short circuit current protection point; current sampling signal IU/IV/IW is through synthesis; rectification; arrange suitable datum mark, achieve IGBT all sidedly to its protection under various overcurrent and short-circuit conditions, it is very reliable and stable that multiparity article batch produces this protective circuit of checking.
After the action of ACPL-332J short-circuit protection, needing the next one to open signal could reset, and after breaking down; the control of DSP is opened signal and is blocked always; for making ACPL-332J normal reset, U801-B/Q800 etc. form reset circuit, ensure that the normal reset of ACPL-332J.
For a person skilled in the art, after reading above-mentioned explanation, various changes and modifications undoubtedly will be apparent.Therefore, appending claims should regard the whole change and correction of containing true intention of the present invention and scope as.In Claims scope, the scope of any and all equivalences and content, all should think and still belong to the intent and scope of the invention.
Claims (10)
1. frequency converter overcurrent protection and an automatic reset circuit, is characterized in that, described circuit comprises:
Three phase full bridge rectification module, is connected with frequency converter sampled output, in order to carry out rectification process to current sampling signal;
Three-phase imbalance detection module, is connected with described frequency converter sampled output, in order to detect the three-phase current unbalance degree of described current sampling signal;
Overcurrent and degree of unbalance determination module, be connected with described three-phase imbalance detection module with described three phase full bridge rectification module respectively, for judging whether described frequency converter occurs overcurrent or short circuit;
Fault-signal processing module, is connected with described overcurrent and degree of unbalance determination module, protects during in order to occur overcurrent or short circuit at frequency converter to circuit, and makes described circuit carry out reset processing after fault solves.
2. frequency converter overcurrent protection according to claim 1 and automatic reset circuit, it is characterized in that, described current sampling signal input three phase full bridge rectification module, the described output of three phase full bridge rectification module is connected with the input of filtration module, and the output of described filtration module is connected respectively at the in-phase input end of the first comparator in described overcurrent and degree of unbalance determination module and the reverse input end of the second comparator; The in-phase input end of described first comparator is also connected with the output of described three-phase imbalance detection module; The in-phase input end of described second comparator accesses a fixed voltage.
3. frequency conversion overcurrent protection according to claim 2 and automatic reset circuit, it is characterized in that, described fault-signal processing module comprises the first inverter, the first resistance, the second resistance, the first triode and control board, and the output of described first comparator is connected with the input of described first inverter with the output of described second comparator;
To connect between the output of described first inverter and the base stage of described first triode described first resistance;
The grounded emitter of described first triode;
The collector electrode of described first triode is connected with control board by described second resistance, and described control board is in order to carry out troubleshooting when overcurrent or short circuit appear in described filter.
4. frequency conversion overcurrent protection according to claim 3 and automatic reset circuit, is characterized in that, described first triode is insulated gate electrode transistor npn npn.
5. frequency conversion overcurrent protection according to claim 3 and automatic reset circuit, is characterized in that, the output of described first comparator, also accesses the positive pole of the first diode between the output of described second comparator and described first inverter; Described first diode and the 3rd resistant series, described first diode and the second diodes in parallel.
6. frequency conversion overcurrent protection according to claim 5 and automatic reset circuit, is characterized in that, described first diode is also connected with optical coupler by one the 4th resistance with the positive pole of described second diode.
7. frequency conversion overcurrent protection according to claim 6 and automatic reset circuit; it is characterized in that; described 4th resistor coupled in parallel one second inverter and the 5th resistance, described 5th resistance accesses the base stage of the second triode, and the collector electrode of described second triode is connected with described 4th resistance.
8. frequency conversion overcurrent protection according to claim 7 and automatic reset circuit, is characterized in that, described first diode is connected with the positive pole of the 4th diode with the 3rd diode of parallel connection with the positive pole of described second diode; Described 3rd diode is all connected with the collector electrode of described second triode with the negative pole of described 4th diode.
9. frequency conversion overcurrent protection according to claim 7 and automatic reset circuit, is characterized in that, the collector electrode of described second triode also connects with the 3rd inverter of connecting and the 4th inverter; The output of described 4th inverter is also by a light-emitting diode access fixed voltage.
10. frequency conversion overcurrent protection according to claim 6 and automatic reset circuit, is characterized in that, the model of described optical coupler is ACPL-322J.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510574185.1A CN105071349A (en) | 2015-09-09 | 2015-09-09 | Converter over-current protection and automatic reset circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510574185.1A CN105071349A (en) | 2015-09-09 | 2015-09-09 | Converter over-current protection and automatic reset circuit |
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| CN105071349A true CN105071349A (en) | 2015-11-18 |
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| CN201510574185.1A Pending CN105071349A (en) | 2015-09-09 | 2015-09-09 | Converter over-current protection and automatic reset circuit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108173241A (en) * | 2018-02-05 | 2018-06-15 | 珠海格力电器股份有限公司 | Protection circuit of IPM module |
| CN110518549A (en) * | 2019-08-20 | 2019-11-29 | 珠海格力电器股份有限公司 | Overcurrent protection circuit of DC brushless motor |
| CN111371065A (en) * | 2020-04-03 | 2020-07-03 | 宁波安信数控技术有限公司 | Servo driver IGBT overcurrent turn-off stage protection circuit |
| CN113007084A (en) * | 2021-02-26 | 2021-06-22 | 青岛海尔空调电子有限公司 | Compressor fault early warning method and device |
| CN114362555A (en) * | 2021-12-28 | 2022-04-15 | 核工业西南物理研究院 | Power module with multi-functional selection |
| CN117254429A (en) * | 2023-10-21 | 2023-12-19 | 江苏力普电子科技有限公司 | Protection method and system for high-voltage frequency converter |
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Inventor after: Chen Xueyun Inventor after: Zhang Qingfei Inventor before: Chen Xiaohua Inventor before: Chen Xueyun |
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Application publication date: 20151118 |
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