CN203466724U - Frequency converter - Google Patents
Frequency converter Download PDFInfo
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- CN203466724U CN203466724U CN201320590749.7U CN201320590749U CN203466724U CN 203466724 U CN203466724 U CN 203466724U CN 201320590749 U CN201320590749 U CN 201320590749U CN 203466724 U CN203466724 U CN 203466724U
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- frequency converter
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- 239000003990 capacitor Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 abstract description 6
- 230000008569 process Effects 0.000 abstract description 5
- 230000020169 heat generation Effects 0.000 abstract 1
- 238000010438 heat treatment Methods 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 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
- 238000004134 energy conservation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
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Abstract
The utility model discloses a frequency converter which comprises a rectifier circuit which is connected with the mains supply, a rectifier circuit which is connected with the rectifier circuit, and an inverter circuit which is connected with the filter circuit. A soft starting circuit is arranged between the rectifier circuit and the filter circuit and comprises at least two current limiting resistors in parallel connection and a switching device which is in parallel connection with the current limiting resistors. The switching device is connected with a controller. According to the frequency converter, through setting the soft starting circuit which is formed by at least two current limiting resistors and the switching device, the large resistance loss in the soft starting process is reduced, the heat generation is reduced, and the reliability is raised.
Description
Technical field
The utility model relates to industrial control technology field, in particular, and particularly a kind of frequency converter with soft start function.
Background technology
Frequency converter, as the core of frequency conversion speed-adjusting system, is more and more applied at industrial control field.Frequency converter is the on-off action that utilizes power semiconductor device, regulates mains frequency to regulate a kind of control device of motor speed.The advantages such as adopt frequency control to have speed-regulating range width, adjusting speed accuracy is high, and dynamic response is fast, low speed torque good, saves energy, operating efficiency are high, easy to use.Application frequency control, not only can make motor move under energy-conservation rotating speed, but also can greatly improve the control precision of motor speed, lifting process quality and production efficiency.
For at present conventional voltage-type ac-dc-ac frequency converter topology, prime is the uncontrollable rectification unit of input, and intergrade is high power DC energy storage filter unit, and rear class is inversion output unit.DC energy storage filter unit mainly consists of big capacity electrolyte capacitor, because electric capacity initial condition is equivalent to short circuit, frequency converter input side closes a floodgate while powering on, if just the voltage after rectification is added on electrochemical capacitor without any processing, can cause the charging current that moment is larger, thereby impact to frequency converter commutating circuit, and cause electrochemical capacitor life to decline, even have the danger of blast.
Existing method is for adopting a current-limiting resistance to add relay (or controllable silicon) combination, but the shortcoming of this scheme is: the loss of soft start-up process current-limiting resistance is large, heating is serious, reliability is low, once current-limiting resistance burns out, frequency converter just can not be restarted, thereby frequency converter can not be worked.When frequency converter frequently powers on, frequency converter is operated in soft start state by continuous several times, and current-limiting resistance more seriously burns out heating, makes frequency converter produce fault, greatly reduces the reliability of system.
Utility model content
The purpose of this utility model is, for the technical problem that has the low grade of reliability in prior art, to provide a kind of frequency converter.
In order to solve problem set forth above, the technical solution adopted in the utility model is:
A kind of frequency converter, comprise the rectification circuit being electrically connected to city, the filter circuit being connected with rectification circuit, with the inverter circuit being connected with filter circuit, between described finishing circuit and filter circuit, be also provided with soft starting circuit, and this soft starting circuit comprises at least two current-limiting resistances in parallel, and the switching device in parallel with current-limiting resistance, and this switching device is connected with a controller.
According to a preferred embodiment of the present utility model: described controller comprises:
Whether the first comparison module is normal for judging the input city signal of telecommunication;
The second comparison module, for judging whether frequency converter filter circuit has charged;
Control module, for to switching device output drive signal;
Described the first comparison module is connected with control module respectively with the second comparison module.
According to a preferred embodiment of the present utility model: described current-limiting resistance is two.
According to a preferred embodiment of the present utility model: be also connected with inductance between described current-limiting resistance and filter resistance.
According to a preferred embodiment of the present utility model: described filter circuit is a filter capacitor.
According to a preferred embodiment of the present utility model: described switching device is a relay.
Compared with prior art, the beneficial effects of the utility model are: the soft starting circuit forming by least two current-limiting resistances and switching device are set, reduced the resistance loss in soft start-up process large, its heating is reduced, increased reliability.
Accompanying drawing explanation
Fig. 1. be the circuit structure diagram of frequency converter of the present utility model.
Fig. 2. be the structure chart of frequency converter middle controller of the present utility model.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in further detail, but execution mode of the present utility model is not limited to this.
Consult shown in Fig. 1, the utility model provides a kind of frequency converter, comprise the rectification circuit B being electrically connected to city, the filter circuit being connected with rectification circuit B, with the inverter circuit D being connected with filter circuit, between described finishing circuit B and filter circuit, be also provided with soft starting circuit, and this soft starting circuit comprises at least two current-limiting resistances in parallel, and the switching device in parallel with current-limiting resistance, and this switching device is connected with a controller K.
Consult shown in Fig. 2, the controller K in the utility model comprises: whether the first comparison module is normal for judging the input city signal of telecommunication; The second comparison module, for judging whether frequency converter filter circuit has charged; Control module, for to switching device output drive signal; Wherein, the first comparison module is connected with control module respectively with the second comparison module.
Described current-limiting resistance is two, i.e. current-limiting resistance R1 shown in Fig. 1 and current-limiting resistance R2.Certainly, the number of current-limiting resistance can arrange as required.
General, between current-limiting resistance and filter resistance, be also connected with inductance L 1.
Filter circuit in the utility model is a filter capacitor C1.
Switching device in the utility model is a relay J 1.
Operation principle of the present utility model is:
The first step, the first comparison module of controller K judges that whether detected input power signal is normal, enters second step as undesired, as normally entered the 3rd step;
The driving signal of relay J 1 conducting is forbidden in second step, control module output, forbids filter capacitor C1 charging, finishes soft start;
The 3rd step, control module make the driving signal of relay J 1 conducting, and electric current charges to filter capacitor C1 by current-limiting resistance R1, R2, open soft start;
The 4th step, the second comparison module detect and judge whether filter capacitor C1 has charged, and enter the 5th step as charged, otherwise return to the 3rd step;
The driving signal that the 5th step, control module output disconnect filter capacitor C1, completes soft start-up process.
Above-described embodiment is preferably execution mode of the utility model; but execution mode of the present utility model is not restricted to the described embodiments; other any do not deviate from change, the modification done under Spirit Essence of the present utility model and principle, substitutes, combination, simplify; all should be equivalent substitute mode, within being included in protection range of the present utility model.
Claims (6)
1. a frequency converter, comprise the rectification circuit being electrically connected to city, the filter circuit being connected with rectification circuit, with the inverter circuit being connected with filter circuit, it is characterized in that: between described finishing circuit and filter circuit, be also provided with soft starting circuit, and this soft starting circuit comprises at least two current-limiting resistances in parallel, and the switching device in parallel with current-limiting resistance, and this switching device is connected with a controller.
2. according to frequency converter claimed in claim 1, it is characterized in that: described controller comprises,
Whether the first comparison module is normal for judging the input city signal of telecommunication;
The second comparison module, for judging whether frequency converter filter circuit has charged;
Control module, for to switching device output drive signal;
Described the first comparison module is connected with control module respectively with the second comparison module.
3. frequency converter according to claim 2, is characterized in that: described current-limiting resistance is two.
4. frequency converter according to claim 2, is characterized in that: between described current-limiting resistance and filter resistance, be also connected with inductance.
5. frequency converter according to claim 2, is characterized in that: described filter circuit is a filter capacitor.
6. frequency converter according to claim 2, is characterized in that: described switching device is a relay.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320590749.7U CN203466724U (en) | 2013-09-24 | 2013-09-24 | Frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320590749.7U CN203466724U (en) | 2013-09-24 | 2013-09-24 | Frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203466724U true CN203466724U (en) | 2014-03-05 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201320590749.7U Expired - Fee Related CN203466724U (en) | 2013-09-24 | 2013-09-24 | Frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203466724U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104539196A (en) * | 2014-12-10 | 2015-04-22 | 深圳市雷赛智能控制股份有限公司 | Driver soft start protecting device and protecting method thereof |
| CN109980907A (en) * | 2017-12-26 | 2019-07-05 | 杭州易和网络有限公司 | The high-frequency filter circuit of low cost |
-
2013
- 2013-09-24 CN CN201320590749.7U patent/CN203466724U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104539196A (en) * | 2014-12-10 | 2015-04-22 | 深圳市雷赛智能控制股份有限公司 | Driver soft start protecting device and protecting method thereof |
| CN109980907A (en) * | 2017-12-26 | 2019-07-05 | 杭州易和网络有限公司 | The high-frequency filter circuit of low cost |
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Legal Events
| Date | Code | Title | Description |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee | ||
| CP01 | Change in the name or title of a patent holder |
Address after: 510663 No. 17 Xiangshan Road, Science Town, Guangzhou hi tech Industrial Development Zone, Guangdong, China Patentee after: GUANGZHOU SANJING ELECTRIC CO., LTD. Address before: 510663 No. 17 Xiangshan Road, Science Town, Guangzhou hi tech Industrial Development Zone, Guangdong, China Patentee before: Guangzhou Sanjing Electric Co., Ltd. |
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| 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: 20140305 Termination date: 20190924 |