CN203747642U - Frequency converter soft start circuit - Google Patents
Frequency converter soft start circuit Download PDFInfo
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- CN203747642U CN203747642U CN201420130050.7U CN201420130050U CN203747642U CN 203747642 U CN203747642 U CN 203747642U CN 201420130050 U CN201420130050 U CN 201420130050U CN 203747642 U CN203747642 U CN 203747642U
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- frequency converter
- relay
- ptc
- soft start
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- 239000003990 capacitor Substances 0.000 claims description 19
- 238000000034 method Methods 0.000 abstract description 5
- 230000008569 process Effects 0.000 abstract description 4
- 230000000630 rising effect Effects 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 2
- 230000010349 pulsation Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000010304 firing Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
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Abstract
The utility model discloses a safe and reliable frequency converter soft start circuit. The soft start circuit comprises a positive temperature coefficient thermistor PTC, a relay, a rectifier bridge and a bus capacitance circuit. One end of the PTC is connected with output of the rectifier bridge, and the other end of the PTC is connected with the bus capacitance circuit. The two ends of the main contact of the relay are connected in parallel with the two ends of the PTC. Influence on a post stage circuit caused by the situation that the relay is not closed due to over-current, overvoltage and failure of a control circuit in the electrified process can be effectively prevented, and the circuit is ensured to automatically recover to the normal state after a fault is eliminated.
Description
Technical field
The utility model is specifically related to a kind of safe and reliable frequency converter soft starting circuit.
Background technology
Frequency converter is the on-off action that utilizes power semiconductor device; power frequency supply is transformed to the electric energy control device of another frequency, can realizes soft start to AC induction motor, frequency control, raising running accuracy, change the functions such as power factor, overcurrent/overvoltage/overload protection.
The AC-DC-AC form that conventional frequency converter is voltage-type at present, prime is input rectifying unit, and intergrade is high power DC energy storage filter unit, and rear class is inversion output unit.DC energy storage filter unit is mainly made up of big capacity electrolyte capacitor, because electric capacity initial condition is equivalent to short circuit, when frequency converter input side powers on, if the voltage after rectification is added on electrochemical capacitor without any processing, can cause the charging current that moment is larger, can impact to frequency converter commutating circuit, cause electrochemical capacitor life to decline, even have the danger of blast.Therefore, frequency converter must arrange protective circuit, makes the voltage rising at electrochemical capacitor two ends at powered on moment, to avoid above-mentioned fault to occur, and Here it is soft starting circuit.
The soft starting circuit scheme generally using in frequency converter is at present: series limiting resistor in the charge circuit of bus capacitor, and its two ends are in parallel with switching device, and after powering on, circuit charges to bus capacitor after current-limiting resistance current limliting; When the DC voltage rising of bus capacitor is during to set point, use switching device closure by current-limiting resistance bypass, enter normal operating conditions.The shortcoming of this scheme has:
1, in soft start-up process, current-limiting resistance loss is large, and heating is serious, and reliability is low, once current-limiting resistance burns out, frequency converter can not be restarted.
2, in the time that frequency converter frequently powers on, continuous operation is at soft start state, and current-limiting resistance will generate heat more serious, thereby easy burn-out more makes frequency converter produce fault, greatly reduces the reliability of system.
3, the DC voltage rising of bus capacitor is to set point, and switching device is normally closed not, causes the most at last current-limiting resistance continuous firing and permanent burning out makes frequency converter cisco unity malfunction.
Summary of the invention
For solving the above-mentioned problems in the prior art, the utility model proposes a kind of safe and reliable soft starting circuit, overcurrent, overvoltage and control circuit not adhesive of the switching device situation that the causes impact on rear one-level circuit of losing efficacy while effectively having prevented from powering on, ensure after Failure elimination, circuit can return to normal condition certainly simultaneously.
In order to achieve the above object, the utility model provides a kind of safe and reliable frequency converter soft starting circuit, comprise semistor (English " Positive Temperature Coefficient " is called for short PTC) 101, relay 102, rectifier bridge 103 and bus capacitor circuit 104.Semistor 101 one end are connected with the output of rectifier bridge 103, and semistor 101 other ends are connected with bus capacitor circuit 104, and the main contacts two ends of relay 102 are in parallel with semistor 101 two ends.
The relative prior art of the utility model has the following advantages:
1, the semistor that the utility model adopts substitutes conventional current-limiting resistance; because semistor Yin Wendu raises; resistance sharply raises thereupon; in time in self-shield off state; and after pending fault is eliminated; the temperature of semistor PTC declines automatically, returns to normal low-resistance operating state, has avoided traditional current-limiting resistance easily to cause the drawback of permanent damage.
2, conventional current-limiting resistance is because of high-power demand, and volume is very large; And the semistor volume that the utility model adopts is little, can be processed into according to demand the product of various difformities, specification simultaneously, when design, the space of busy line plate is less, is more suitable for compact design demand.
A kind of safe and reliable frequency converter soft starting circuit provided by the utility model, not only can be used for frequency converter field, can also be applied to other converter technique fields such as servo-driver.
Brief description of the drawings
Fig. 1 is the circuit diagram of the utility model frequency converter soft starting circuit.
In figure, 101-PTC(is semistor), 102-relay, 103-rectifier bridge, 104-bus capacitor circuit.
Embodiment
Below in conjunction with accompanying drawing, the utility model is described in detail.
As shown in Figure 1, a kind of safe and reliable frequency converter soft starting circuit provided by the utility model, comprise PTC101, relay 102, rectifier bridge 103 and bus capacitor circuit 104, PTC101 one end is connected with the output of rectifier bridge 103, the PTC101 other end is connected with bus capacitor circuit 104, and the main contacts two ends of relay 102 are in parallel with PTC101 two ends.
A kind of safe and reliable frequency converter soft starting circuit provided by the utility model, is specifically applied in frequency converter and powers on buffer circuit, wherein acting as of each part:
1, PTC101: power on while charging to bus capacitor for current limliting, while breaking down for the protection of rear one-level circuit.
2, relay 102: closed after reception driving signal, for bypass PTC101.
3, rectifier bridge 103: the direct voltage that three-phase input voltage is rectified into pulsation.
4, bus capacitor circuit 104: the direct voltage of pulsation is carried out to filtering.
The operation principle of a kind of safe and reliable frequency converter soft starting circuit provided by the utility model, comprises the following steps:
Step 1, enters step 2 when the frequency converter input power signal adjusted is normal through rectifier bridge 103, enters step 3 when power supply signal is undesired.
Step 2, rectifier bridge 103 forms charging circuit through PTC101 current limliting bus capacitor circuit 104 is charged, if charging normally enters step 4, the undesired step 3 that enters.
Step 3, PTC101 raises because of temperature, and resistance sharply raises thereupon, thereby in time in self-shield off state; After pending fault is eliminated, the temperature of PTC101 declines automatically, returns to normal low-resistance operating state, reenters soft start-up process, returns to step 1.
Step 4, enters step 5 after bus capacitor circuit 104 has charged, and uncharged completing returned to step 2.
Step 5, control signal drives relay 102 closures, completes soft start-up process.Because of relay 102 with PTC101 in state in parallel, after relay 102 closures, PTC101 is in bypass condition.
Claims (1)
1. a frequency converter soft starting circuit, is characterized in that: described frequency converter soft starting circuit comprises semistor (101), relay (102), rectifier bridge (103) and bus capacitor circuit (104); Described semistor (101) one end is connected with the output of described rectifier bridge (103), described semistor (101) other end is connected with described bus capacitor circuit (104), and the main contacts two ends of described relay (102) are in parallel with described semistor (101) two ends.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420130050.7U CN203747642U (en) | 2014-03-21 | 2014-03-21 | Frequency converter soft start circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420130050.7U CN203747642U (en) | 2014-03-21 | 2014-03-21 | Frequency converter soft start circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203747642U true CN203747642U (en) | 2014-07-30 |
Family
ID=51347395
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420130050.7U Expired - Lifetime CN203747642U (en) | 2014-03-21 | 2014-03-21 | Frequency converter soft start circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203747642U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106300271A (en) * | 2015-06-03 | 2017-01-04 | 台达电子工业股份有限公司 | The detection method of soft start inefficacy and converter plant |
| CN108162723A (en) * | 2016-12-07 | 2018-06-15 | 中达电子零组件(吴江)有限公司 | A kind of air conditioner for electric motor coach system and its frequency converter |
| CN113983650A (en) * | 2021-11-15 | 2022-01-28 | 海信（广东）空调有限公司 | Low-power-consumption control method and device for air conditioner, air conditioner outdoor unit and air conditioner |
-
2014
- 2014-03-21 CN CN201420130050.7U patent/CN203747642U/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106300271A (en) * | 2015-06-03 | 2017-01-04 | 台达电子工业股份有限公司 | The detection method of soft start inefficacy and converter plant |
| CN106300271B (en) * | 2015-06-03 | 2018-09-28 | 台达电子工业股份有限公司 | The detection method and converter plant of soft start failure |
| CN108162723A (en) * | 2016-12-07 | 2018-06-15 | 中达电子零组件(吴江)有限公司 | A kind of air conditioner for electric motor coach system and its frequency converter |
| CN113983650A (en) * | 2021-11-15 | 2022-01-28 | 海信（广东）空调有限公司 | Low-power-consumption control method and device for air conditioner, air conditioner outdoor unit and air conditioner |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140730 |
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| CX01 | Expiry of patent term |