CN201937480U - Single-phase full-control rectifying and current-limiting device - Google Patents
Single-phase full-control rectifying and current-limiting device Download PDFInfo
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- CN201937480U CN201937480U CN 201120015643 CN201120015643U CN201937480U CN 201937480 U CN201937480 U CN 201937480U CN 201120015643 CN201120015643 CN 201120015643 CN 201120015643 U CN201120015643 U CN 201120015643U CN 201937480 U CN201937480 U CN 201937480U
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Abstract
The utility model relates to a single-phase full-control rectifying and current-limiting device capable of preventing from the damage of devices at the moment when a single-phase full-control rectifying bridge and an alternating-current bus are switched on. The single-phase full-control rectifying and current-limiting device comprises the single-phase full-control rectifying bridge, a direct-current filtering capacitor, a single-phase bridge type inverter and a CPU (Central Processing Unit), wherein the direct-current output end of the single-phase full-control rectifying bridge is connected with the two ends of the direct-current filtering capacitor and the direct-current power supply input end of the single-phase bridge type inverter; the CPU is connected with the rectifying control end of the single-phase full-control rectifying bridge and the inverse control end of the single-phase bridge type inverter; the alternating-current end of the single-phase full-control rectifying bridge is provided with a current transformer; a voltage sensor connected with the CPU is arranged between the positive electrode and the negative electrode of the direct-current filtering capacitor; the alternating-current end of the single-phase full-control rectifying bridge is connected with a soft charging circuit in series; and the soft charging circuit comprises a thyristor and a current-limiting resistor connected with the thyristor in parallel, and a gate pole of the thyristor is connected with the CPU.
Description
Technical field
The utility model relates to the technical field of single-phase full-controlled rectifier, specifically is a kind of single-phase full-controlled rectifier current-limiting apparatus and rectification current-limiting method thereof.
Background technology
Fig. 1 is single-phase bridge current transformer back-to-back, and its main part is made up of single-phase bridge rectifier (that is: single-phase full-controlled rectifier bridge A), dc filter capacitor C, single-phase bridge type inverter B, comprises auxiliary bodies such as fuse F in addition.Single-phase bridge rectifier is by IGBT module (T
1～T
6) constitute.
As shown in Figure 2, close a floodgate moment at single-phase full-controlled rectifier bridge A and ac bus, on the one hand, because the voltage of dc filter capacitor C can not suddenly change, and initial voltage is 0, on the other hand, because the direct voltage u at dc filter capacitor C two ends
DcDo not set up as yet, so IGBT module (T
1～T
6) uncontrollable.For these reasons, at the beginning of powering on, alternating current is by described IGBT module (T
1～T
6) in fly-wheel diode do not control rectification because the impedance of whole flow cycle is less, and pressure reduction is very big, easily forms bigger short-circuit impact electric current, is equivalent to the short circuit with single-phase full-controlled rectifier bridge A this moment.Because the cost problem can not determined the power cell component parts by this temporary impact electric current.But, must cause device failure again if do not handle.
In addition, make single-phase full-controlled rectifier bridge A be operated in the controlled rectification stage, described direct voltage u
DcStill need the lifting of charging, need carry out release this moment with the IGBT module, to carry out the High Power Factor rectification, continues dc filter capacitor C is charged and voltage stabilizing.Problem appears at the moment of release charging, and the alternating current amplitude of the single-phase full-controlled rectifier bridge A that flows through increases tens of times suddenly, and direct voltage u
DcAlso occur overcharging and the vibrational stabilization process, as shown in Figure 4.Alternating current has this moment constituted serious threat to described IGBT module.Therefore, in single-phase full-control type switching process, never control the rectification release and switch to controlled rectification during the stage, overcurrent situation out of control significantly can occur, power device has been constituted serious threat.The analysis of causes: the soft charging circuit of IGBT release moment, two thyristor Tr conductings of soft charging link, its influence can be ignored.Suppose that AC side a phase voltage is the highest at this moment, u
Ab, u
AcAll greater than 0, as shown in Figure 5, because two IGBT(T of same brachium pontis
1And T
2, T
3And T
4, T
5And T
6) logic of turn-on and turn-off reciprocal (dc-side short-circuit that causes when preventing two IGBT of same brachium pontis conducting simultaneously), so hypothesis a phase brachium pontis T at this moment
2End, then T
1By the fly-wheel diode conducting of IGBT, as shown in Figure 5, if b phase brachium pontis two tubulose attitudes are by T
4Conducting switches to T
3Conducting AC side then will occur and pass through T
1And T
3The phenomenon that is short-circuited; In like manner, c phase brachium pontis T
5During conducting, T
1And T
5The phenomenon that is short-circuited, then current i
aTo uprush; If a phase brachium pontis T
2T is worked as in conducting
4, T
6Cut when logical by disconnected, current i can occur equally
aThe phenomenon that heightens, as shown in Figure 6.
How to solve the problems of the technologies described above, be the technical barrier of this area.
Summary of the invention
The technical problems to be solved in the utility model provides a kind of preventing and causes the single-phase full-controlled rectifier current-limiting apparatus of device failure in single-phase full-controlled rectifier bridge and ac bus moment of closing a floodgate, and provide a kind of and be suitable in single-phase full-control type switching process, never control the rectification release and switch to controlled rectification during the stage, prevent overcurrent rectification current-limiting method out of control significantly.
For solving the technical problem that causes device failure in single-phase full-controlled rectifier bridge and ac bus combined floodgate moment, the utility model provides a kind of single-phase full-controlled rectifier current-limiting apparatus, and it comprises: single-phase full-controlled rectifier bridge A, dc filter capacitor C, single-phase bridge type inverter B and CPU element; The dc output end of single-phase full-controlled rectifier bridge A links to each other with the dc supply input of the two ends of dc filter capacitor C and single-phase bridge type inverter B; CPU element links to each other with the rectification control end of single-phase full-controlled rectifier bridge A and the inversion control end of single-phase bridge type inverter B; The ac input end of described single-phase full-controlled rectifier bridge A is provided with the current transformer that links to each other with described CPU element, is provided with the voltage sensor that links to each other with described CPU element between the positive and negative electrode of dc filter capacitor C; It is characterized in that: the ac input end at single-phase full-controlled rectifier bridge A is connected in series a soft charging circuit D; This soft charging circuit D comprises: thyristor Tr, the current-limiting resistance R in parallel with this thyristor Tr, the gate pole of thyristor Tr links to each other with described CPU element.
Described single-phase full-controlled rectifier bridge A comprises two groups of IGBT unit, each is organized the IGBT unit and comprises: upper and lower IGBT module, each IGBT module comprises: IGBT and fly-wheel diode, the anode of this fly-wheel diode connects the emitter of IGBT, the negative electrode of fly-wheel diode connects the collector electrode of IGBT, and the grid of each IGBT is the rectification control end of described single-phase full-controlled rectifier bridge A; The emitter of IGBT in the last IGBT module connects down the collector electrode of the IGBT in the IGBT module; The collector electrode of IGBT on each in the IGBT module connects the positive pole of described dc filter capacitor C, and the emitter of the IGBT in each time IGBT module connects the negative pole of described dc filter capacitor C; The contact of the upper and lower IGBT module in two groups of IGBT unit respectively with single phase alternating current power supply in live wire link to each other with zero line.
The utlity model has positive effect: when (1) single-phase full-controlled rectifier current-limiting apparatus of the present utility model is worked, when CPU element records the ac input end connection single phase alternating current power supply of single-phase full-controlled rectifier bridge A by described current transformer, the IGTB that CPU element is controlled in each thyristor Tr and each IGBT module ends, and single-phase full-controlled rectifier bridge A is in does not control rectification state; AC power fly-wheel diode in each IGBT module in described current-limiting resistance R and single-phase full-controlled rectifier bridge A carries out precharge to dc filter capacitor C; Because the existence of current-limiting resistance R has limited overshoot current; Record the direct voltage u at dc filter capacitor C two ends by described voltage sensor when CPU element
DcAfter stable, CPU element triggers each thyristor Tr conducting, with the described current-limiting resistance R of bypass.This moment is because described direct voltage u
DcHave certain initial voltage, the pressure reduction of single-phase full-controlled rectifier bridge A both sides is less, thereby makes the charging current of dc filter capacitor C less relatively, so be suitable for avoiding causing device failure in single-phase full-controlled rectifier bridge and ac bus moment of closing a floodgate.(2) for solving in single-phase full-control type switching process, never controlling the rectification release switches to controlled rectification and occurs overcurrent technical problem out of control significantly during the stage, the utility model has adopted single-phase full-controlled rectifier current limliting strategy, this strategy not only can limit single-phase charging current effectively, and can steadily charge to capacitor, prevent its oscillatory process.
Description of drawings
For the easier quilt of content of the present utility model is clearly understood, below the specific embodiment and in conjunction with the accompanying drawings of basis, the utility model is described in further detail, wherein
Fig. 1 is the single-phase back-to-back fully controlled bridge converter topologies schematic diagram among the embodiment.
Fig. 2 is the switching process of the single-phase full-controlled rectifier bridge when adopting soft charging circuit to carry out soft charging, and wherein, wave band 1 is not controlled commutation phase for the band current-limiting resistance; Wave band 2 is not controlled commutation phase during for the thyristor conducting in the soft charging circuit; Wave band 3 is the controlled rectification stage.
Embodiment
See Fig. 1, the single-phase full-controlled rectifier current-limiting apparatus of present embodiment comprises: single-phase full-controlled rectifier bridge A, dc filter capacitor C, single-phase bridge type inverter B and CPU element; The dc output end of single-phase full-controlled rectifier bridge A links to each other with the dc supply input of the two ends of dc filter capacitor C and single-phase bridge type inverter B; CPU element links to each other with the rectification control end of single-phase full-controlled rectifier bridge A and the inversion control end of single-phase bridge type inverter B; The ac input end of described single-phase full-controlled rectifier bridge A is provided with the current transformer that links to each other with described CPU element, is provided with the voltage sensor that links to each other with described CPU element between the positive and negative electrode of dc filter capacitor C; It is characterized in that: the ac input end at single-phase full-controlled rectifier bridge A is connected in series a soft charging circuit D; This soft charging circuit D comprises: thyristor Tr, the current-limiting resistance R in parallel with this thyristor Tr, the gate pole of thyristor Tr links to each other with described CPU element.
Described single-phase full-controlled rectifier bridge A comprises two groups of IGBT unit, each is organized the IGBT unit and comprises: upper and lower IGBT module, each IGBT module comprises: IGBT and fly-wheel diode, the anode of this fly-wheel diode connects the emitter of IGBT, the negative electrode of fly-wheel diode connects the collector electrode of IGBT, and the grid of each IGBT is the rectification control end of described single-phase full-controlled rectifier bridge A; The emitter of IGBT in the last IGBT module connects down the collector electrode of the IGBT in the IGBT module; The collector electrode of IGBT on each in the IGBT module connects the positive pole of described dc filter capacitor C, and the emitter of the IGBT in each time IGBT module connects the negative pole of described dc filter capacitor C; The contact of the upper and lower IGBT module in two groups of IGBT unit respectively with single phase alternating current power supply in live wire link to each other with zero line.
The foregoing description only is for the utility model example clearly is described, and is not to be qualification to execution mode of the present utility model.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here need not also can't give exhaustive to all execution modes.And these belong to conspicuous variation or the change that spirit of the present utility model extended out and still are among the protection range of the present utility model.
Claims (2)
1. a single-phase full-controlled rectifier current-limiting apparatus comprises: single-phase full-controlled rectifier bridge (A), dc filter capacitor (C), single-phase bridge type inverter (B) and CPU element;
The dc output end of single-phase full-controlled rectifier bridge (A) links to each other with the two ends of dc filter capacitor (C) and the dc supply input of single-phase bridge type inverter (B); CPU element links to each other with the rectification control end of single-phase full-controlled rectifier bridge (A) and the inversion control end of single-phase bridge type inverter (B); The ac input end of described single-phase full-controlled rectifier bridge (A) is provided with the current transformer that links to each other with described CPU element, is provided with the voltage sensor that links to each other with described CPU element between the positive and negative electrode of dc filter capacitor (C); It is characterized in that:
Ac input end at single-phase full-controlled rectifier bridge (A) is connected in series a soft charging circuit (D); This soft charging circuit (D) comprising: thyristor (Tr), the current-limiting resistance (R) in parallel with this thyristor (Tr), the gate pole of thyristor (Tr) links to each other with described CPU element.
2. single-phase full-controlled rectifier current-limiting apparatus according to claim 1, it is characterized in that: described single-phase full-controlled rectifier bridge (A) comprises two groups of IGBT unit, each is organized the IGBT unit and comprises: upper and lower IGBT module, each IGBT module comprises: IGBT and fly-wheel diode, the anode of this fly-wheel diode connects the emitter of IGBT, the negative electrode of fly-wheel diode connects the collector electrode of IGBT, and the grid of each IGBT is the rectification control end of described single-phase full-controlled rectifier bridge (A); The emitter of IGBT in the last IGBT module connects down the collector electrode of the IGBT in the IGBT module; The collector electrode of IGBT on each in the IGBT module connects the positive pole of described dc filter capacitor (C), and the emitter of the IGBT in each time IGBT module connects the negative pole of described dc filter capacitor (C); The contact of the upper and lower IGBT module in two groups of IGBT unit respectively with single phase alternating current power supply in live wire link to each other with zero line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120015643 CN201937480U (en) | 2011-01-18 | 2011-01-18 | Single-phase full-control rectifying and current-limiting device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120015643 CN201937480U (en) | 2011-01-18 | 2011-01-18 | Single-phase full-control rectifying and current-limiting device |
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| Publication Number | Publication Date |
|---|---|
| CN201937480U true CN201937480U (en) | 2011-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120015643 Expired - Fee Related CN201937480U (en) | 2011-01-18 | 2011-01-18 | Single-phase full-control rectifying and current-limiting device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102075101A (en) * | 2011-01-18 | 2011-05-25 | 江苏省电力公司常州供电公司 | Single-phase full-control rectifier current-limiting device and work method thereof |
| CN110165882A (en) * | 2018-05-08 | 2019-08-23 | 北京机电工程研究所 | For powering on the inverter of buffering |
-
2011
- 2011-01-18 CN CN 201120015643 patent/CN201937480U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102075101A (en) * | 2011-01-18 | 2011-05-25 | 江苏省电力公司常州供电公司 | Single-phase full-control rectifier current-limiting device and work method thereof |
| CN102075101B (en) * | 2011-01-18 | 2013-04-03 | 江苏省电力公司常州供电公司 | Single-phase full-control rectifier current-limiting device and work method thereof |
| CN110165882A (en) * | 2018-05-08 | 2019-08-23 | 北京机电工程研究所 | For powering on the inverter of buffering |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: JIANGSU ELECTRIC POWER CO. STATE ELECTRIC NET CROP Effective date: 20120926 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 213000 CHANGZHOU, JIANGSU PROVINCE TO: 213003 CHANGZHOU, JIANGSU PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20120926 Address after: 213003 Jiangsu province Changzhou City Tianning District Bureau Street No. 27 Patentee after: Changzhou Power Supply Co, Jiangsu Provincial Power Corp. Patentee after: Jiangsu Electric Power Company Patentee after: State Grid Corporation of China Address before: 213000 Tianning District, Jiangsu, Changzhou, No. 27 Patentee before: Changzhou Power Supply Co, Jiangsu Provincial Power Corp. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110817 Termination date: 20160118 |
|
| EXPY | Termination of patent right or utility model |