CN2847678Y - High voltage frequency converter - Google Patents
High voltage frequency converter Download PDFInfo
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- CN2847678Y CN2847678Y CN 200520035727 CN200520035727U CN2847678Y CN 2847678 Y CN2847678 Y CN 2847678Y CN 200520035727 CN200520035727 CN 200520035727 CN 200520035727 U CN200520035727 U CN 200520035727U CN 2847678 Y CN2847678 Y CN 2847678Y
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Abstract
The utility model relates to a frequency converter, particularly a high voltage switching-on and a high voltage switching-off circuits of a high voltage frequency converter. The utility model discloses a frequency converter capable of reducing operating overvoltage and current impact, and the utility model has the advantages of simple structure and low cost. The utility model has the technical scheme that the high voltage frequency converter comprises a rectifier transformer and a control system, and the rectifier transformer is provided with auxiliary windings; the auxiliary windings are connected with a low voltage power supply through a current limiting circuit; the current limiting circuit is connected with the control system. The utility model has the advantages of simple structure and low cost, and can effectively reduce the operating overvoltage; the utility model can reduce impact current when the frequency converter switches on or switches off in a high voltage mode. The utility model is mainly used for a frequency converter of high voltage and high power.
Description
Technical field
The utility model relates to frequency converter, and particularly logical, the high pressure of the high pressing of high voltage converter divides deenergizing.
Background technology
Frequency converter has purposes widely, particularly high voltage converter at industrial control field, industrial especially to heavy-duty motor control, the visual plant of speed governing.High voltage converter mainly comprises: the PLC of rectifier transformer, rectification circuit, inversion electric bridge, driving and protective circuit, main control computer, secondary computer, control able to programme and ruling fault and control interface circuit etc.At this, we might as well be referred to as the PLC of main control computer, secondary computer, control able to programme and ruling fault and control interface circuit etc. the control system of frequency converter; The power cell that rectification circuit, inversion electric bridge etc. is called frequency converter.Frequency converter and motor have been formed frequency conversion speed-adjusting system.
The high pressing of various high voltage converters is logical, the high pressure breaking course is basic identical, is example with the tandem type high voltage converter only at this, illustrate that the high pressing of high voltage converter is led to, during the high pressure disjunction to the influence of rectifier transformer and frequency converter.
Frequency converter, particularly high-voltage high-power frequency transformator,, high pressure disjunction logical in high pressing moment, rectifier transformer can produce very big switching overvoltage, and impulse current is very big, causes the damage of frequency converter easily.
In order to reduce transformer switching overvoltage and impulse current, the method that prior art adopts is, sets up auxiliary winding on the rectifier transformer of frequency converter, and auxiliary winding is connected with low-tension supply (being generally AC380V) by alternating-current switch.Before frequency converter starts, connect the low-tension supply of auxiliary winding earlier, for the rectifier transformer secondary side is carried out excitation,, disconnect auxiliary winding power supply through one section time-delay, connect frequency converter high voltage power power supply, finish the high pressing of frequency converter and pass through journey.
The shortcoming of prior art is: after disconnecting auxiliary winding power supply, when the high pressing of frequency converter was led to, the rectifier transformer secondary side still can produce huge switching overvoltage, caused frequency converter to damage easily.
The high pressure breaking course of high voltage converter generally all is directly to disconnect frequency converter high voltage power mains switch, and can produce huge switching overvoltage in the rectifier transformer secondary side this moment equally, influential to frequency converter.
The utility model content
Technical problem to be solved in the utility model, rush of current is big when being exactly, high pressure disjunction logical at the high pressing of existing frequency converter, and there is the shortcoming of switching overvoltage in transformer, and a kind of frequency converter that can reduce rush of current and switching overvoltage is provided.
The utility model solves the problems of the technologies described above, and the technical scheme of employing is, high voltage converter comprises rectifier transformer and control system, and described rectifier transformer is provided with auxiliary winding; Described auxiliary winding is connected with low-tension supply by current-limiting circuit; Described current-limiting circuit is connected with control system.
The beneficial effects of the utility model are, and are simple in structure, with low cost, can effectively reduce switching overvoltage, reduce that the high pressing of frequency converter is logical, the impulse current during the high pressure disjunction.
Description of drawings
Fig. 1 is the structural representation of embodiment 1;
Fig. 2 is the structural representation of embodiment 2.
Embodiment
Below in conjunction with drawings and Examples, describe the technical solution of the utility model in detail.
The utility model increases auxiliary winding and current-limiting circuit on rectifier transformer, utilize control system that current-limiting circuit is controlled, high pressing progressively improves voltage when logical, progressively reduces voltage during the high pressure disjunction, thereby reach the reduction switching overvoltage, reduce the purpose of impulse current.Frequency converter of the present utility model, in the logical and high pressure breaking course, auxiliary winding and winding of rectifier transformer have one section to be in the also network process that closes logical state simultaneously in high pressing.
The technical solution of the utility model is that high voltage converter comprises rectifier transformer and control system; Described rectifier transformer is provided with auxiliary winding; Described auxiliary winding is connected with low-tension supply, and described auxiliary winding is connected with low-tension supply by current-limiting circuit; Described current-limiting circuit is connected with control system;
Described current-limiting circuit comprises at least one element circuit of mains switch and series connection; Described mains switch and element circuit are connected with control system;
Described element circuit is made of the parallel circuits of resistance and by-pass switch; Described by-pass switch is connected with control system;
Described element circuit is made of the parallel circuits of inductance and by-pass switch; Described by-pass switch is connected with control system;
Described by-pass switch is an A.C. contactor;
Described by-pass switch is a noncontacting switch;
Described noncontacting switch is a controllable silicon;
Described high voltage converter operating voltage is 3～10kV.
Embodiment 1
This routine frequency changer as shown in Figure 1.This is a tandem type high voltage converter, and system mainly is made up of power cell 5, rectifier transformer 8, control system 6, current-limiting circuit 7, frequency converter high voltage power mains switch 1.Winding 2 of rectifier transformer 8 installings, secondary winding 4 and auxiliary winding 3.Wherein, one time winding 2 is connected with frequency converter high voltage power mains switch 1, and secondary winding 4 is connected with power cell 5, and auxiliary winding 3 is connected with low-tension supply by current-limiting circuit 7.This routine current-limiting circuit 7 is by mains switch 71, and resistance 74 and by-pass switch 72 n element circuits in parallel constitute.Mains switch 71 and by-pass switch 72 are driven by control system.For A, B, C three phase mains, the parameter of each phase current-limiting circuit is identical.Among the figure, by-pass switch 72 is three to link, and each phase by-pass switch is in parallel with the resistance 74 of similar resistance, constitute a current-limiting circuit unit of this example, by-pass switch 72 can adopt A.C. contactor, relay, also can adopt contactless electronic beam switch, as controllable silicon etc.Resistance can be the same or different between the current-limiting circuit unit.Low-tension supply is general consistent with the control power supply of factory, is 380V, and frequency converter high voltage power power supply is generally 3～10kV.
The high pressing of frequency converter is as follows by journey:
The first step: the mains switch 71 of closed current-limiting circuit, the auxiliary winding 3 of low-voltage control power and rectifier transformer is connected, this moment, each by-pass switch 72 was in off-state, low-tension supply by current-limiting circuit to transformer secondary winding 4 excitations;
Second step: after one section time-delay, the by-pass switch of a closed element circuit is all closed until n by-pass switch at set intervals;
The 3rd step: closed frequency converter high voltage power mains switch 1, this moment, the mains switch 71 of current-limiting circuit still was in closure state, had at this moment promptly realized described in the utility model and network process;
The 4th step: after a period of time of being incorporated into the power networks, disconnecting power switch 71 and each by-pass switch 72, the high pressing of frequency converter finishes by journey.
Frequency converter high pressure breaking course is as follows:
The first step: alternating-current switch 71 and each current-limiting circuit by-pass switch 72 of closed current-limiting circuit of while, frequency converter high voltage power mains switch 1 still is in closure state at this moment, has at this moment promptly realized described in the utility model and network process;
Second step: after a period of time of being incorporated into the power networks, disconnect frequency converter high voltage power mains switch 1, the auxiliary winding 3 of low-voltage control power and rectifier transformer is connected, and the transformer secondary winding is carried out excitation;
The 3rd step: after one section time-delay, disconnect the by-pass switch 72 of an element circuit at set intervals, all disconnect until the by-pass switch 72 of n element circuit;
The 4th step: after one section time-delay, disconnect alternating-current switch 71, frequency converter high pressure breaking course finishes.
According to the method described above frequency converter is carried out logical, the high pressure disjunction of high pressing, can reduce the switching overvoltage and the impulse current of transformer, improve the reliability of frequency converter work.
Fig. 2 is the structural representation of present embodiment, and this routine element circuit is made of the parallel circuits of inductance 73 with by-pass switch 72.Other architectural features of this example, and high pressing is logical, the high pressure breaking course is identical with embodiment 1, repeats no more herein.
The foregoing description can not limit implementation of the present utility model, for those skilled in the art, according to description of the present utility model, in conjunction with the ordinary skill in the art multiple implementation can be arranged, and it all belongs to protection range of the present utility model.
Claims (8)
1, high voltage converter comprises rectifier transformer and control system, and described rectifier transformer is provided with auxiliary winding; It is characterized in that: described auxiliary winding is connected with low-tension supply by current-limiting circuit; Described current-limiting circuit is connected with control system.
2, high voltage converter according to claim 1 is characterized in that: described current-limiting circuit comprises at least one element circuit of mains switch and series connection; Described mains switch and element circuit are connected with control system.
3, high voltage converter according to claim 2 is characterized in that: described element circuit is made of the parallel circuits of resistance and by-pass switch; Described by-pass switch is connected with control system.
4, high voltage converter according to claim 2 is characterized in that: described element circuit is made of the parallel circuits of inductance and by-pass switch; Described by-pass switch is connected with control system.
5, according to claim 3 or 4 described high voltage converters, it is characterized in that: described by-pass switch is an A.C. contactor.
6, according to claim 3 or 4 described high voltage converters, it is characterized in that: described by-pass switch is a noncontacting switch.
7, high voltage converter according to claim 6 is characterized in that: described noncontacting switch is a controllable silicon.
8, high voltage converter according to claim 1 is characterized in that: described high voltage converter, operating voltage are 3～10kV.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520035727 CN2847678Y (en) | 2005-10-12 | 2005-10-12 | High voltage frequency converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200520035727 CN2847678Y (en) | 2005-10-12 | 2005-10-12 | High voltage frequency converter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2847678Y true CN2847678Y (en) | 2006-12-13 |
Family
ID=37513100
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200520035727 Expired - Lifetime CN2847678Y (en) | 2005-10-12 | 2005-10-12 | High voltage frequency converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2847678Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102223083A (en) * | 2011-06-15 | 2011-10-19 | 深圳市英威腾电气股份有限公司 | Frequency converter |
-
2005
- 2005-10-12 CN CN 200520035727 patent/CN2847678Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102223083A (en) * | 2011-06-15 | 2011-10-19 | 深圳市英威腾电气股份有限公司 | Frequency converter |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20061213 |
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| EXPY | Termination of patent right or utility model |