CN202798477U - DC voltage-controllable intelligent power unit of frequency converter - Google Patents
DC voltage-controllable intelligent power unit of frequency converter Download PDFInfo
- Publication number
- CN202798477U CN202798477U CN 201220172166 CN201220172166U CN202798477U CN 202798477 U CN202798477 U CN 202798477U CN 201220172166 CN201220172166 CN 201220172166 CN 201220172166 U CN201220172166 U CN 201220172166U CN 202798477 U CN202798477 U CN 202798477U
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- inverter
- frequency converter
- intelligent power
- power unit
- phase
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Abstract
The utility model discloses a DC voltage-controllable intelligent power unit of a frequency converter. The intelligent power unit of the frequency converter comprises a phase-shifting transformer, wherein an output terminal of a unit controller is connected with a low voltage side of the phase-shifting transformer, a secondary side of the phase-shifting transformer is connected with a pre-stage of a rectification loop, a back-stage of the rectification loop is connected with a pre-stage of a DC bus, a back stage of the DC bus is connected with a pre-stage of an inverter, and a back stage of the inverter is used as an output terminal. The intelligent power unit is characterized in that the rectification loop is a tryristor controllable three-phase rectification loop, wherein the gate of each tryristor of the tryristor controllable three-phase rectification loop is connected with the unit controller; and the inverter is an insulated gate bipolar transistor inverter, wherein the gate of an insulated gate bipolor transistor in the insulated gate bipolar transistor inverter is connected with the unit controller. The DC voltage-controllable intelligent power unit of the frequency converter reduces current impacts on an energy-storage capacitor while enables the frequency converter to be stable in low frequency operation.
Description
Technical field
The utility model relates to the controlled frequency converter intelligent power unit of a kind of direct voltage, belongs to the high voltage converter technical field.
Background technology
At present, the energy-saving and emission-reduction work of the whole society is just in ruly expansion.From energy consumption structure, the consumption of motor has accounted for the overwhelming majority, because frequency converter (especially powerful high voltage converter) possesses the ability of regulating electric acc power, thereby can play energy-conservation effect.What present on the market most high voltage converters adopted is the central controlled mode in unit, because element number is numerous, will control the difficult that just seems to the dc voltage of unit, thereby most manufacturers has adopted the mode of simple diode full-bridge rectification.But there is two large problems in this mode: the one, and powered on moment owing to be uncontrollable diode rectification, can cause greatly rush of current to energy storage capacitor, is unfavorable for the long-time running of capacitor; The 2nd, during low frequency, because IGBT inverter bridge pwm pulse is narrow, frequency converter output is unstable, can have influence on the safe operation of motor.Therefore in the urgent need to a kind of means that can solve these two problems.
The utility model is exactly for this demand and specialized designs, because what the high voltage converter that relates in the utility model adopted is intelligent power unit mode, there is intelligent device in inside, unit, therefore can become not controlled diode rectification controlled thyristor rectifier, thereby well solve this two large problems.
Summary of the invention
The purpose of this utility model provides the method for the controlled frequency converter unit of a kind of direct voltage, solves in the high voltage converter running, and uncontrollable diode rectification causes the problem of rush of current to energy storage capacitor.Simultaneously, make frequency converter more stable when low-frequency operation.
In order to achieve the above object, the utility model provides a kind of direct voltage controlled frequency converter intelligent power unit, comprise phase shifting transformer, the output of cell controller is connected with the low-pressure side of phase shifting transformer, the secondary of phase shifting transformer is connected with the prime of commutating circuit, the rear class of commutating circuit connects the prime of dc bus, the rear class of dc bus connects the prime of inverter, the rear class of inverter is as output, it is characterized in that, described commutating circuit is the controlled three phase rectifier of thyristor loop, the gate pole of each thyristor is connected with cell controller respectively in the controlled three phase rectifier of the thyristor loop, described inverter is igbt inverter (being designated hereinafter simply as the IGBT inverter), and the gate pole of the igbt in the igbt inverter is connected with cell controller respectively.
Described dc bus comprises for the copper bar of a connection and the film capacitor in parallel with described commutating circuit and described H bridge inverter.
The utility model is by regulating the trigger angle of thyristor rectifier part, and Ud is big or small for the control direct voltage, and then by the required voltage of IGBT inverter bridge output.Particularly, be exactly order and the parameter according to master controller, trigger thyristor according to the synchronizing signal time-delay, so that direct voltage is controlled, finally trigger the voltage that the IGBT inversion circuit obtains requiring.The utility model makes frequency converter when low-frequency operation when reducing the rush of current that energy storage capacitor is subject to, and also keeps stable.
Description of drawings
Fig. 1 is the circuit diagram of the controlled frequency converter intelligent power unit of a kind of direct voltage.
Embodiment
Below in conjunction with embodiment and accompanying drawing the utility model is described in detail.
Embodiment
As shown in Figure 1, the controlled frequency converter intelligent power unit of a kind of direct voltage that provides for the utility model, the output Uout of this frequency converter intelligent power unit joins with other unit or load, and it comprises cell controller, the controlled three phase rectifier of thyristor loop, dc bus and IGBT inverter.Wherein, the controlled three phase rectifier of thyristor loop is comprised of thyristor V1 to V6, and the IGBT inverter is comprised of igbt T1 to T4 and anti-also diode D1 to D4 thereof, and dc bus is comprised of film capacitor C and copper bar.The output of cell controller is connected with the low-pressure side of phase shifting transformer, the secondary of phase shifting transformer is connected with the prime in the controlled three phase rectifier of thyristor loop, the rear class in the controlled three phase rectifier of thyristor loop connects the prime of dc bus, the rear class of dc bus connects the prime of IGBT inverter, and the rear class of IGBT inverter is as output.The gate pole of each thyristor in the controlled three phase rectifier of the thyristor loop is connected with cell controller, and the gate pole of the igbt in the IGBT inverter is connected with the pulse signal input terminal of cell controller.
When frequency converter intelligent power unit powers on, at first can the trigger angle of thyristor be placed 150 degree according to three-phase synchronous signal, make rectifying part be in complete inverter mode, this moment, direct voltage Ud was 0, IGBT inverter locking pulse output.
When cell controller was assigned charge command, frequency converter intelligent power unit can progressively reduce Trigger Angle according to synchronizing signal, makes direct voltage Ud slowly be increased to set point, reaches the purpose of soft start, can reduce the impact to the dc energy storage capacitor C.
When finishing the front after two steps, cell controller can be notified ready, and cell controller will be assigned output command this moment.The U that frequency converter intelligent power unit can provide according to cell controller
0(inverter output voltage effective value) and f (inverter output frequency) in conjunction with direct voltage Ud, produce new output voltage control value U
1=(Un/Ud) * U
0, Un refers to the direct voltage under the rated condition in the formula, i.e. direct voltage during the controllable silicon Full-open.Frequency converter intelligent power unit is with being about to according to formula 1.414*U
1* Sin (2 π f*t) produces pwm pulse, and is final so that the effective value Uout=U of IGBT inverter output voltage
0
When frequency converter output frequency and voltage are all higher, frequency converter intelligent power unit can trigger rectifier bridge entirely according to the instruction of cell controller, namely the gate pole at thyristor has remained trigger impulse, like this can be so that the output characteristic of thyristor is consistent with rectifier diode.This moment U
1=U
0, the effective value Uout of unit output also equals U
0
Claims (2)
1. frequency converter intelligent power unit that direct voltage is controlled, comprise phase shifting transformer, the output of cell controller is connected with the low-pressure side of phase shifting transformer, the secondary of phase shifting transformer is connected with the prime of commutating circuit, the rear class of commutating circuit connects the prime of dc bus, the rear class of dc bus connects the prime of inverter, the rear class of inverter is as output, it is characterized in that, described commutating circuit is the controlled three phase rectifier of thyristor loop, the gate pole of each thyristor is connected with cell controller respectively in the controlled three phase rectifier of the thyristor loop, described inverter is the igbt inverter, and the gate pole of the igbt in the igbt inverter is connected with cell controller respectively.
2. the controlled frequency converter intelligent power unit of a kind of direct voltage as claimed in claim 1 is characterized in that, described dc bus comprises for the copper bar of a connection and the film capacitor in parallel with described commutating circuit and H bridge inverter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220172166 CN202798477U (en) | 2012-04-22 | 2012-04-22 | DC voltage-controllable intelligent power unit of frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220172166 CN202798477U (en) | 2012-04-22 | 2012-04-22 | DC voltage-controllable intelligent power unit of frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202798477U true CN202798477U (en) | 2013-03-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220172166 Expired - Fee Related CN202798477U (en) | 2012-04-22 | 2012-04-22 | DC voltage-controllable intelligent power unit of frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202798477U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110971116A (en) * | 2019-12-24 | 2020-04-07 | 湖南时铭电气有限公司 | Soft start circuit and soft start method of voltage source type inverter |
| CN114337232A (en) * | 2022-03-09 | 2022-04-12 | 常州索维尔电子科技有限公司 | Soft start circuit, soft start method, switching power supply, device, and storage medium |
-
2012
- 2012-04-22 CN CN 201220172166 patent/CN202798477U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110971116A (en) * | 2019-12-24 | 2020-04-07 | 湖南时铭电气有限公司 | Soft start circuit and soft start method of voltage source type inverter |
| CN114337232A (en) * | 2022-03-09 | 2022-04-12 | 常州索维尔电子科技有限公司 | Soft start circuit, soft start method, switching power supply, device, and storage medium |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130313 Termination date: 20200422 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |