CN203800819U - Frequency converter and power-on protection module thereof - Google Patents
Frequency converter and power-on protection module thereof Download PDFInfo
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- CN203800819U CN203800819U CN201420181540.XU CN201420181540U CN203800819U CN 203800819 U CN203800819 U CN 203800819U CN 201420181540 U CN201420181540 U CN 201420181540U CN 203800819 U CN203800819 U CN 203800819U
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- 238000001514 detection method Methods 0.000 claims description 18
- 239000003990 capacitor Substances 0.000 abstract description 2
- 230000001681 protective effect Effects 0.000 description 9
- 238000010586 diagram Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 230000003292 diminished effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007634 remodeling Methods 0.000 description 1
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Abstract
The utility model provides a frequency converter and a power-on protection module thereof. The power-on protection module comprises an input side circuit and an output side circuit for outputting voltages lower than input side voltages. The output side circuit is connected in parallel with a DC bus capacitor, the power-on protection module is connected with a control module, a soft start resistor module with variable resistance is connected in series between the input side circuit and the output side circuit, and the control module controls the resistance change of a soft start resistor. According to the utility model, the resistance change of the soft start resistor module is controlled so that currents in the power-on protection module can be stable, and electrical appliances are protected from easily damaged when power is on.
Description
Technical field
The utility model relates to frequency converter and the protection module that powers on, especially about in the stage of powering on by soft resistance with the frequency converter of mild impulse current and the protection module that powers on thereof.
Background technology
Because the impulse current of frequency converter powered on moment is very large, the situation that easily causes the dc-link capacitance of outlet side to damage because electric current is excessive.Therefore at present traditional mode is between the rectification input side of frequency converter and dc-link capacitance, to be connected in series soft resistance to limit DC bus charging current.Refer to shown in Fig. 1, comprising the one protection module that powers on.External power supply connects rectification input side, and rectification input side is connected with one soft resistor group, comprise soft resistance R1 and with soft the switching device that resistance R1 is in parallel.Be connected with the inverter circuit of rectification outlet side in the rear end of soft resistance R1, and inverter circuit is parallel with dc-link capacitance.In the time that frequency converter just starts to power on, switching device disconnects, by soft resistance to dc-link capacitance current-limiting charge, in the time detecting that DC bus-bar voltage rises to the magnitude of voltage of setting, the switching device in parallel with soft resistance starts conducting and bypasses soft resistance, gives DC bus powered by switching device.All described control actions all complete by the control module being electrically connected with power-on protective circuit.
But, organize soft resistor group in the time that dc-link capacitance is charged to high voltage with single, the voltage difference at resistance two ends is dwindled gradually, and the resistance of single group charging resistor remains unchanged, therefore charged electrical fails to be convened for lack of a quorum and obviously reduces, and causes DC bus-bar voltage to rise very slow, finally make total charging interval can be very long, and along with the increase of transducer power, the charging interval can obviously lengthen, therefore soft resistance of this traditional approach cannot meet the needs of the occasion of fast powering-up starting machine.
Utility model content
The frequency converter that the purpose of this utility model is to provide the power-on protective circuit module of the magnitude of current in a kind of effective control electrification circuit and has this module.
An aspect of the present utility model is to provide the one protection module that powers on; comprise input side circuit and the outlet side circuit lower than input side voltage in order to output; on outlet side circuit, be parallel with dc-link capacitance; on the wherein said protection module that powers on, be connected with control module; between described input side circuit and outlet side circuit, be in series with soft variable resistive module of resistance; described soft resistive module comprises two or more soft resistor group, the change in resistance of soft resistive module described in described control module control.
The utility model also has following characteristics, described two or more soft resistor group series connection, and described soft resistor group comprises soft resistance and described soft the switching device that resistance is in parallel.
The utility model also has following characteristics, described two or more soft resistor group comprises the first switching device that first soft resistance is in parallel with it, and at least one second soft resistor group in parallel with described first soft resistance, described second soft resistor group comprises the second switch device of second soft resistance and series connection with it.
The utility model also has following characteristics, described in power on protection module and be connected with voltage detection module, the resistance of soft resistive module of described control module control changes according to the magnitude of voltage of described dc-link capacitance.
The utility model also has following characteristics, and the resistance that described control module is arranged to control soft resistive module is along with the magnitude of voltage of dc-link capacitance raises and diminishes.
The utility model also has following characteristics, described in power on protection module and be connected with current detection module, described control module is controlled the resistance of soft resistance according to the current value of all soft modules of flowing through.
The utility model also has following characteristics, and described input side circuit comprises rectification circuit.
The utility model also has following characteristics, and described outlet side circuit comprises inverter circuit.
The utility model also has following characteristics, described in power on protection module for frequency converter.
Of the present utility modelly be on the other hand to provide a kind of frequency converter, wherein in frequency converter, there is the protection module that powers on as described above.
Protection module and the frequency converter thereof of powering on of the present utility model; by soft resistive module can controlling resistance size is set; the rush of current of electrical equipment in the time powering on reduced, thereby protective device upper level protection equipment not fragile and protective device in the time powering on is difficult for tripping operation.
Brief description of the drawings
Below with reference to the accompanying drawings exemplary embodiment of the present utility model is elaborated, should be appreciated that embodiment described below is only for explaining the utility model, and scope of the present utility model is not restricted, appended accompanying drawing wherein:
Fig. 1 illustrates a kind of circuit diagram of prior art power-on protective circuit;
Fig. 2 illustrates the circuit diagram of protection module the first embodiment that powers on of the present utility model;
Fig. 3 illustrates the circuit diagram of protection module the second embodiment that powers on of the present utility model.
Embodiment
In different accompanying drawings, same or analogous parts represent with identical Reference numeral.
Should be appreciated that accompanying drawing is only for describing the utility model, wherein the number of the size of parts, proportionate relationship and parts is not all as to restriction of the present utility model.
The protection module that powers on of the present utility model is mainly used in frequency converter, is used in any occasion that need to carry out upper electric protection but also do not get rid of.Electric protection in what is called, the electric current that refers to restricted passage dc-link capacitance in the time powering on makes the device in electrical equipment avoid the impact of super-high-current.
First embodiment of the protection module that powers on of the present utility model refers to shown in Fig. 2.The side of the rectification circuit being formed by multiple diodes in the protection module that powers on of the present utility model, is connected with power supply, is to be input side circuit.On rectification circuit, be in series with at least two soft resistance R1, R2------, Rn is parallel with a switching device on each soft resistance.Each soft resistance and corresponding soft resistor group of switching device composition thereof.Multiple soft resistor group form soft resistive module.Described in the inverter circuit being made up of multiple triodes is connected in, power in the circuit of protection module, a dc-link capacitance is parallel to described inverter circuit, with by Voltage-output, forms outlet side circuit.Described dc-link capacitance can be also the dc-link capacitance group of multiple dc-link capacitance compositions.In addition, in power-on protective circuit, be connected with voltage detection module, the magnitude of voltage of dc-link capacitance can be detected in real time.In power-on protective circuit, also there is control module; conducting and the bypass of the switching device in each soft resistor group of the soft pack module that electrifies of magnitude of voltage control that described control module can detect according to voltage detection module; thereby the resistance of soft resistive module can be controlled, can change.
At work, in the time that power-on protective circuit just starts to power on, the all switching devices in parallel with each soft resistance are all in off-state, bus capacitor is by soft resistance R1+R2+ ... + Rn is by current-limiting charge, when detecting DC bus-bar voltage, current detection section reaches after the reference voltage threshold V1 of default, control module is sent triggering signal, make switching device one conducting, bypass soft resistance R1, when detecting DC bus-bar voltage, current detection section reaches after the reference voltage threshold V2 of default, control module is sent triggering signal, make switching device two conductings, bypass soft resistance R2, the like, until detecting DC bus-bar voltage, current detection section reaches after last reference voltage threshold Vn (n>1) of default, control module is sent triggering signal, make corresponding switching device conducting, bypass soft resistance Rn, so far, all soft resistance is bypassed, the protection module that powers on has powered on.
In the present embodiment, also setting voltage detection module and use current detection module not, thus the current value detecting by current detection module is controlled the resistance value of soft resistive module, also can reach the object that power up is controlled.
Second embodiment of the protection module that powers on of the present utility model as shown in Figure 3.The difference of the second embodiment and the first embodiment is, described soft resistive module difference is set.Described soft resistive module comprises the first resistance R 1 and first switching device in parallel with it, and at least one second resistor group in parallel with described the first resistance, and described the second resistor group comprises the second switch device of the second resistance and series connection with it.
At work, in the time that the protection module that powers on has just started to power on, all switching devices of soft resistive module are all in off-state, dc-link capacitance, is reached after the reference voltage threshold V1 of default when current detection section detects DC bus-bar voltage by current-limiting charge by soft resistance R1, and control module is sent triggering signal, make corresponding second switch break-over of device, soft resistance R2 is merged in charge circuit, and soft resistive module resistance value diminished, and charging current increases; The like; when detecting DC bus-bar voltage, current detection section reaches after the reference voltage threshold Vn-1 of default (n>1); control section sends triggering signal; make the second switch break-over of device corresponding with it; finally when detecting DC bus-bar voltage, current detection section reaches after last reference voltage threshold Vn (n>1) of default; control section sends triggering signal and makes the first switching device conducting; soft the resistance that bypasses all parallel connections, the protection module that so far powers on has powered on.
In the present embodiment, equally also setting voltage detection module and use current detection module not, thus the current value detecting by current detection module is controlled the resistance value of soft resistive module, also can reach the object that power up is controlled.
Certainly, the utility model also has other mode of operation, and for example multiple soft resistance connection in series-parallel mix, or make controllable soft the resistance of other resistance.
The utility model has disclosed a kind of power-on protective circuit, has also disclosed a kind of frequency converter that uses this electrification circuit.
Below only in conjunction with the most practical preferred embodiment of considering at present, the utility model is described; it will be appreciated that; above-mentioned explanation is not to restriction of the present utility model; the utility model is also not limited to above-mentioned giving an example; variation, remodeling, interpolation or replacement that those skilled in the art make in essential scope of the present utility model, also should belong to protection range of the present utility model.
Claims (10)
1. the protection module that powers on; comprise input side circuit and the outlet side circuit lower than input side voltage in order to output; on outlet side circuit, be parallel with dc-link capacitance; it is characterized in that; on the described protection module that powers on, be connected with control module; between described input side circuit and outlet side circuit, be in series with soft variable resistive module of resistance, described soft resistive module comprises two or more soft resistor group, the change in resistance of soft resistive module described in described control module control.
2. the protection module that powers on as claimed in claim 1, is characterized in that, described two or more soft resistor group series connection, and described soft resistor group comprises soft resistance and described soft the switching device that resistance is in parallel.
3. the protection module that powers on as claimed in claim 1; it is characterized in that; described two or more soft resistor group comprises the first switching device that first soft resistance is in parallel with it; and at least one second soft resistor group in parallel with described first soft resistance, described second soft resistor group comprises the second switch device of second soft resistance and series connection with it.
4. the protection module that powers on as claimed in claim 1, is characterized in that, described in power on protection module and be connected with voltage detection module, the resistance of soft resistive module of described control module control changes according to the magnitude of voltage of described dc-link capacitance.
5. the protection module that powers on as claimed in claim 4, is characterized in that, the resistance that described control module is arranged to control soft resistive module is along with the magnitude of voltage of dc-link capacitance raises and diminishes.
6. the protection module that powers on as claimed in claim 1, is characterized in that, described in power on protection module and be connected with current detection module, described control module is controlled the resistance of soft resistance according to the current value of all soft modules of flowing through.
7. the protection module that powers on as claimed in claim 1, is characterized in that, described input side circuit comprises rectification circuit.
8. the protection module that powers on as claimed in claim 1, is characterized in that, described outlet side circuit comprises inverter circuit.
9. the protection module that powers on as described in any one in claim 1 to 8, is characterized in that, described in power on protection module for frequency converter.
10. a frequency converter, is characterized in that, has the protection module that powers on as described in any one in claim 1 to 8 in frequency converter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420181540.XU CN203800819U (en) | 2014-04-15 | 2014-04-15 | Frequency converter and power-on protection module thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420181540.XU CN203800819U (en) | 2014-04-15 | 2014-04-15 | Frequency converter and power-on protection module thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203800819U true CN203800819U (en) | 2014-08-27 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420181540.XU Expired - Lifetime CN203800819U (en) | 2014-04-15 | 2014-04-15 | Frequency converter and power-on protection module thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203800819U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105119501A (en) * | 2015-08-26 | 2015-12-02 | 长沙奥托自动化技术有限公司 | Pre-charging circuit for low-voltage frequency converter and pre-charging method |
| CN108322036A (en) * | 2018-04-24 | 2018-07-24 | 华北电力科学研究院有限责任公司 | A kind of novel flexible DC converter station |
| CN108988269A (en) * | 2018-08-22 | 2018-12-11 | 南京南瑞继保电气有限公司 | A kind of voltage-source type deicing device and control method and control device |
| CN112653335A (en) * | 2020-12-08 | 2021-04-13 | 华为技术有限公司 | Power conversion circuit, control method of power conversion circuit and transformer |
-
2014
- 2014-04-15 CN CN201420181540.XU patent/CN203800819U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105119501A (en) * | 2015-08-26 | 2015-12-02 | 长沙奥托自动化技术有限公司 | Pre-charging circuit for low-voltage frequency converter and pre-charging method |
| CN108322036A (en) * | 2018-04-24 | 2018-07-24 | 华北电力科学研究院有限责任公司 | A kind of novel flexible DC converter station |
| CN108988269A (en) * | 2018-08-22 | 2018-12-11 | 南京南瑞继保电气有限公司 | A kind of voltage-source type deicing device and control method and control device |
| CN112653335A (en) * | 2020-12-08 | 2021-04-13 | 华为技术有限公司 | Power conversion circuit, control method of power conversion circuit and transformer |
| US11909308B2 (en) | 2020-12-08 | 2024-02-20 | Huawei Digital Power Technologies Co., Ltd. | Power conversion circuit, method for controlling power conversion circuit, and transformer |
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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 | ||
| CX01 | Expiry of patent term |
Granted publication date: 20140827 |