CN202586732U - Open-phase protection circuit of frequency converter - Google Patents
Open-phase protection circuit of frequency converter Download PDFInfo
- Publication number
- CN202586732U CN202586732U CN 201220069240 CN201220069240U CN202586732U CN 202586732 U CN202586732 U CN 202586732U CN 201220069240 CN201220069240 CN 201220069240 CN 201220069240 U CN201220069240 U CN 201220069240U CN 202586732 U CN202586732 U CN 202586732U
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- Prior art keywords
- circuit
- shaping
- frequency converter
- road
- open
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- 238000007493 shaping process Methods 0.000 claims abstract description 54
- 238000001514 detection method Methods 0.000 claims abstract description 15
- 238000002955 isolation Methods 0.000 claims abstract description 6
- 230000008878 coupling Effects 0.000 abstract description 2
- 238000010168 coupling process Methods 0.000 abstract description 2
- 238000005859 coupling reaction Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000003990 capacitor Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
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- Emergency Protection Circuit Devices (AREA)
Abstract
The utility model relates to a protection circuit of electrical equipment, especially to an open-phase protection circuit of a frequency converter. The open-phase protection circuit comprises a detection circuit, an amplitude-limiting shaping circuit, an isolation circuit and a driving control circuit, wherein the detection circuit is connected with the amplitude-limiting shaping circuit, the amplitude-limiting shaping circuit is connected with the isolation circuit, and the isolation circuit is connected with the driving control circuit. According to the open-phase protection circuit of the frequency converter, the problem that the frequency converter and loads thereof are damaged when the frequency converter and the loads thereof encounters open-phase faults; when the detection circuit detects open-phase faults in the circuits, the amplitude-limiting shaping circuit is immediately conducted so that equalized shaping is carried out on waveform of unbalanced current, the isolation circuit carries out photoelectrical coupling, and the waveform is finally and reliably connected to the driving control circuit, so that the frequency converter and the loads thereof operate safely.
Description
Technical field
The utility model relates to a kind of protecting circuit for electrical equipment, especially a kind of frequency converter open-phase protection circuit.
Technical background
Along with the fast development of production technology, frequency converter becomes one of common equipment in all trades and professions and the life gradually, and it is important green energy conservation equipment; Usually, frequency converter all has the high power load threephase motor, when work; Occur the three phase mains open-phase fault in the circuit if run into, thereby cause three-phase current unbalance, the fault long-term existence; Will damage frequency converter, even damage the load below it, like threephase motor; Because frequency converter and threephase motor all are the high electric equipments of cost, thus much type of production producer pay much attention to frequency converter with and the open-phase protection of load.
The utility model content
The purpose of the utility model provides a kind of safe and reliable frequency converter open-phase protection circuit.
To achieve these goals, the utility model adopts following technical scheme:
A kind of frequency converter open-phase protection circuit; It comprises testing circuit, limiter shaping circuit, buffer circuit and Drive and Control Circuit; The testing circuit of described frequency converter open-phase protection circuit connects limiter shaping circuit; Described limiter shaping circuit connects buffer circuit, and described buffer circuit connects Drive and Control Circuit.
Preferably; Described testing circuit by the first via, the second road and Third Road totally three road lack detection circuits compose in parallel; First of described first via lack detection circuit detects resistor R 1 and second and detects resistor R 2 series connection; The 3rd of described the second road lack detection circuit detects resistor R 3 and the 5th and detects resistor R 5 series connection, and the 4th of described Third Road lack detection circuit detects resistor R 4 and the 6th and detects resistor R 6 series connection.
Preferably; Described limiter shaping circuit comprises the first via, the second road and Third Road totally three road limiter shaping circuits; First amplitude limit shaping diode D1 of described first via limiter shaping circuit and second amplitude limit shaping diode D2 parallel connection; The 3rd amplitude limit shaping diode D3 of described the second road limiter shaping circuit and the 4th amplitude limit shaping diode D4 parallel connection, the 5th amplitude limit shaping diode D5 of described Third Road limiter shaping circuit and the 6th amplitude limit shaping diode D6 parallel connection.
Preferably, described buffer circuit comprises that one isolates the isolating chip TL181 of the signal after the amplitude limit shaping.
Preferably, described Drive and Control Circuit comprises control chip PL and output unit J4, and the pin 1 of output unit J4 is connected with control chip.
Owing to used such scheme; The frequency converter open-phase protection circuit of the utility model has solved the problem of damaging frequency converter and load when frequency converter and load thereof run into open-phase fault; When testing circuit detects when open-phase fault occurring in the circuit, the conducting limiter shaping circuit carries out balanced shaping to the waveform of unsymmetrical current immediately, again the photoelectricity coupling through buffer circuit; Be connected to Drive and Control Circuit at last reliably, make frequency converter and payload security move.
Description of drawings
Fig. 1 is the module diagram of the utility model embodiment;
Fig. 2 is the circuit diagram of the utility model embodiment;
Embodiment
As depicted in figs. 1 and 2; The frequency converter open-phase protection circuit of present embodiment; It comprises testing circuit 1, limiter shaping circuit 2, buffer circuit 3 and Drive and Control Circuit 4; Described testing circuit 1 connects limiter shaping circuit 2, and described limiter shaping circuit 2 connects buffer circuit 3, and described buffer circuit 3 connects Drive and Control Circuit 4.
Described testing circuit 1 by the first via, the second road and Third Road totally three road lack detection circuits send into after with the high pressure step-down by the first via, the second road and the Third Road limiter shaping circuit 2 formed of totally three road limiter shaping circuits and filter capacitor C1 and amplitude limit resistance R 7; First of described first via lack detection circuit detects resistor R 1 and second and detects resistor R 2 series connection; The 3rd of described the second road lack detection circuit detects resistor R 3 and the 5th and detects resistor R 5 series connection, and the 4th of described Third Road lack detection circuit detects resistor R 4 and the 6th and detects resistor R 6 series connection; Described limiter shaping circuit comprises the first via, the second road and Third Road totally three road limiter shaping circuits; First amplitude limit shaping diode D1 of described first via limiter shaping circuit and second amplitude limit shaping diode D2 parallel connection; The 3rd amplitude limit shaping diode D3 of described the second road limiter shaping circuit and the 4th amplitude limit shaping diode D4 parallel connection, the 5th amplitude limit shaping diode D5 of described Third Road limiter shaping circuit and the 6th amplitude limit shaping diode D6 parallel connection; The signal that obtains after the amplitude limit shaping is sent into buffer circuit 3 through voltage-stabiliser tube Z1, current-limiting resistance R8; Buffer circuit 3 is a core with isolating chip TL181; Send into Drive and Control Circuit 4 and protect control through detecting voltage waveform after the isolation; Described Drive and Control Circuit 4 comprises control chip PL and output unit J4, and control chip carries out drive controlling to the whole Drive and Control Circuit 4 of PL, and output unit J4 output makes the signal of frequency converter reality open-phase protection fault.
The above is merely the preferred embodiment of the utility model; Be not thus the restriction the utility model claim; Every equivalent structure or equivalent flow process conversion that utilizes the utility model specification and accompanying drawing content to be done; Or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the utility model.
Claims (5)
1. frequency converter open-phase protection circuit; Comprise testing circuit, limiter shaping circuit, buffer circuit, Drive and Control Circuit; It is characterized in that: the testing circuit of described frequency converter open-phase protection circuit connects limiter shaping circuit; Described limiter shaping circuit connects buffer circuit, and described buffer circuit connects Drive and Control Circuit.
2. frequency converter open-phase protection circuit as claimed in claim 1; It is characterized in that: described testing circuit by the first via, the second road and Third Road totally three road lack detection circuits compose in parallel; First of described first via lack detection circuit detects resistor (R1) and second and detects resistor (R2) series connection; The 3rd of described the second road lack detection circuit detects resistor (R3) and the 5th and detects resistor (R5) series connection, and the 4th of described Third Road lack detection circuit detects resistor (R4) and the 6th and detects resistor (R6) series connection.
3. frequency converter open-phase protection circuit as claimed in claim 2; It is characterized in that: described limiter shaping circuit comprises the first via, the second road and Third Road totally three road limiter shaping circuits; The first amplitude limit shaping diode (D1) of described first via limiter shaping circuit and second amplitude limit shaping diode (D2) parallel connection; The 3rd amplitude limit shaping diode (D3) of described the second road limiter shaping circuit and the 4th amplitude limit shaping diode (D4) parallel connection, the 5th amplitude limit shaping diode (D5) of described Third Road limiter shaping circuit and the 6th amplitude limit shaping diode (D6) parallel connection.
4. frequency converter open-phase protection circuit as claimed in claim 3 is characterized in that: described buffer circuit comprises the isolating chip (TL181) of the signal after the isolation amplitude limit shaping.
5. frequency converter open-phase protection circuit as claimed in claim 4 is characterized in that: described Drive and Control Circuit comprises control chip (PL) and output unit (J4), and the pin (1) of output unit (J4) is connected with control chip.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220069240 CN202586732U (en) | 2012-02-28 | 2012-02-28 | Open-phase protection circuit of frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220069240 CN202586732U (en) | 2012-02-28 | 2012-02-28 | Open-phase protection circuit of frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202586732U true CN202586732U (en) | 2012-12-05 |
Family
ID=47256094
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220069240 Expired - Fee Related CN202586732U (en) | 2012-02-28 | 2012-02-28 | Open-phase protection circuit of frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202586732U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103420234A (en) * | 2013-08-29 | 2013-12-04 | 天津豪雅科技发展有限公司 | Combined type elevator control cabinet |
| CN103434899A (en) * | 2013-09-03 | 2013-12-11 | 天津豪雅科技发展有限公司 | Integrated controller for elevator |
| CN104418194A (en) * | 2013-08-23 | 2015-03-18 | 天津豪雅科技发展有限公司 | Elevator control cabinet |
-
2012
- 2012-02-28 CN CN 201220069240 patent/CN202586732U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104418194A (en) * | 2013-08-23 | 2015-03-18 | 天津豪雅科技发展有限公司 | Elevator control cabinet |
| CN103420234A (en) * | 2013-08-29 | 2013-12-04 | 天津豪雅科技发展有限公司 | Combined type elevator control cabinet |
| CN103434899A (en) * | 2013-09-03 | 2013-12-11 | 天津豪雅科技发展有限公司 | Integrated controller for elevator |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: SHENZHEN ENERGY TECHNOLOGY CO., LTD. Assignor: Zhu Yandong Contract record no.: 2012440020330 Denomination of utility model: Open-phase protection circuit of frequency converter Granted publication date: 20121205 License type: Exclusive License Record date: 20121210 |
|
| LICC | Enforcement, change and cancellation of record of contracts on the licence for exploitation of a patent or utility model | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121205 Termination date: 20200228 |