CN201781425U - Plasma power chopper - Google Patents
Plasma power chopper Download PDFInfo
- Publication number
- CN201781425U CN201781425U CN 201020509555 CN201020509555U CN201781425U CN 201781425 U CN201781425 U CN 201781425U CN 201020509555 CN201020509555 CN 201020509555 CN 201020509555 U CN201020509555 U CN 201020509555U CN 201781425 U CN201781425 U CN 201781425U
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- chopper
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Abstract
The utility model relates to a plasma power chopper, which is connected between a power source and a load and comprises a three-phase rectifier, a switch tube, a control circuit and a reactor. The three-phase rectifier, the switch tube and the reactor are connected in sequence, the reactor is connected with the load, and the control circuit is connected between the switch tube and the load. The switch tube is an insulating gate bipolar transistor. The control circuit comprises a driving circuit, a pulse width modulator, a given circuit and a feedback circuit. The switch tube is connected with the driving circuit. The driving circuit, the pulse width modulator and the given circuit are connected in sequence. The feedback circuit is connected with the pulse width modulator and the load. The feedback circuit is a shunt or a current sensor. The plasma power chopper has the advantages of low driving power, simple structure, convenience in control, high speed of response, easiness of maintenance, high reliability and the like.
Description
Technical field
The utility model relates to plasma cutting machine, relates in particular to the chopper that is used for plasma cutting machine.
Background technology
Air plasma cutter is a kind of novel thermal cutting equipment, its operation principle is to be working gas with compressed air, is thermal source with the plasma arc of high temperature and high speed, with the metal local melting that is cut, and blow away with high velocity air molten metal simultaneously, form narrow joint-cutting.This equipment can be used for various metal material cuttings such as stainless steel, aluminium, copper, cast iron, carbon steel, and not only cutting speed is fast, joint-cutting is narrow, otch is smooth, the heat affected area is little, the workpiece deformation degree is low, simple to operate, and has obvious energy-saving effect.
Chopper is to be connected between Constant Direct Current power supply and the load circuit in order to change to be added in dc voltage average value on the load circuit and a kind of device of direct current mean value.The chopper device of Shi Yonging has silicon rectifier, silicon controlled rectifier the earliest, is only limited to shortcomings such as 50Hz, reactor size are big, low-response because this class rectifier has operating frequency, has developed normal transistor chopper and field effect transistor rectifier again.This class chopper has overcome the shortcoming of above-mentioned chopper, is current drives but thing followed problem is the normal transistor chopper, so driving power is big; Though and field effect transistor is a driven, driving efficient is little, but its conduction loss is bigger, ability in the withstand voltage Control current down of height is lower, be that single power is lower, need in parallel the use in the high-power applications occasion, and the bigger problem of dynamic current equalizing that causes in parallel and pipe volume makes troubles for physical design, circuit design and the maintenance of chopper, greatly reduces functional reliability.
The utility model content
At the above-mentioned deficiency of existing chopper, the applicant improves through research, provides that a kind of driving power is little, conduction loss is little, simple in structure, plasma power supply chopper that reliability is high.
The technical solution of the utility model is as follows:
The plasma power supply chopper, be connected between power supply and the load, be made up of three-phase rectifier, switching tube, control circuit and reactor, described three-phase rectifier, switching tube and reactor are linked in sequence, reactor connects load, and control circuit is connected between switching tube and the load.
Its further technical scheme is: described switching tube is an insulated gate bipolar transistor.
And, its further technical scheme is: described control circuit is made up of drive circuit, pulse width modulator, given circuit and feedback circuit, described switching tube connects drive circuit, drive circuit, pulse width modulator, given circuit are linked in sequence, and feedback circuit connects pulse width modulator and load.Described feedback circuit is shunt or current sensor.
Useful technique effect of the present utility model is:
The utlity model has that little, simple in structure, the convenient control of driving power, response are fast, easy-maintaining, reliability advantages of higher.Compare with controllable silicon, have the advantage that driving power is little, operating frequency range is wide, the reactor size is little and response speed is high.Compare with the normal transistor chopper, it is little to have a driving power, the good advantage of anti-second breakdown performance.Compare with fet chopper, not only conduction loss is little, and because the switch controlled current capacity is strong, single power consumption by all means is big, in the high voltage input, only needs in the chopper of high-power output with a pipe; And in parallel by all means unlike the field effect chopper with how, therefore, just can avoid the dynamic current equalizing that causes because of parallel connection, problem such as pipe group volume is big and adding to the difficulties to the design and the maintenance of chopper structure, circuit.
Description of drawings
Fig. 1 is a circuit block diagram of the present utility model.
The outside line figure of Fig. 2 pulse width modulator.
Embodiment
Below in conjunction with accompanying drawing, the utility model is specifically described by embodiment.
As shown in Figure 1, the utility model is connected between power supply and the load 5, is made up of three-phase rectifier 1, switching tube 2, control circuit 3 and reactor 4.Three-phase rectifier 1, switching tube 2 are linked in sequence with reactor 4, and reactor 4 connects load 5, and control circuit 3 is connected between switching tube 2 and the load 5.Wherein switching tube 2 is an insulated gate bipolar transistor.Control circuit 3 is made up of drive circuit 6, pulse width modulator 7, given circuit 8 and feedback circuit 9.Switching tube 2 connects drive circuit 6, is driven by drive circuit 6.Drive circuit 6, pulse width modulator 7, given circuit 8 are linked in sequence, and the input of drive circuit 6 is supplied with by pulse width modulator 7.Feedback circuit 9 connects pulse width modulator 7 and load 5, is used to provide the feedback current signal.Feedback circuit 9 can be shunt or current sensor.Each components and parts is a prior art in the present embodiment, can adopt the commercial goods, for example can adopt the SG3526BN pulse width modulator, and the outside line figure of pulse width modulator SG3526BN sees 2.
The course of work of the present utility model is as follows: during operate as normal, the three-phase alternating current of connecting 50Hz is to the chopper input, behind three-phase rectifier 1 rectifying and wave-filtering, obtain invariable direct voltage, send square-wave signal driving switch pipe 2 after drive circuit 6 of 10-25KHZ simultaneously in the pulse width modulator from control circuit 37, make its continuous turn-on and turn-off, thereby make power supply output identical, the square wave that frequency is identical with the control circuit signal.Reactor 4 can make electric current level and smooth, and electric arc is unlikely to be extinguished.
Above-described only is preferred implementation of the present utility model, and the utility model is not limited to above embodiment.Be appreciated that those skilled in the art under the prerequisite that does not break away from spirit of the present utility model and design, can make other improvement and variation.
Claims (4)
1. plasma power supply chopper, be connected between power supply and the load, it is characterized in that forming by three-phase rectifier (1), switching tube (2), control circuit (3) and reactor (4), described three-phase rectifier (1), switching tube (2) are linked in sequence with reactor (4), reactor (4) connects load (5), and control circuit (3) is connected between switching tube (2) and the load (5).
2. according to the described plasma power supply chopper of claim 1, it is characterized in that described switching tube (2) is an insulated gate bipolar transistor.
3. according to the described plasma power supply chopper of claim 1, it is characterized in that described control circuit (3) is made up of drive circuit (6), pulse width modulator (7), given circuit (8) and feedback circuit (9), described switching tube (2) connects drive circuit (6), drive circuit (6), pulse width modulator (7), given circuit (8) are linked in sequence, and feedback circuit (9) connects pulse width modulator (7) and load (5).
4. according to the described plasma power supply chopper of claim 3, it is characterized in that described feedback circuit (9) is shunt or current sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020509555 CN201781425U (en) | 2010-08-27 | 2010-08-27 | Plasma power chopper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020509555 CN201781425U (en) | 2010-08-27 | 2010-08-27 | Plasma power chopper |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201781425U true CN201781425U (en) | 2011-03-30 |
Family
ID=43794626
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201020509555 Expired - Fee Related CN201781425U (en) | 2010-08-27 | 2010-08-27 | Plasma power chopper |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201781425U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101951176A (en) * | 2010-08-27 | 2011-01-19 | 无锡华联科技集团有限公司 | Plasma power supply chopper |
-
2010
- 2010-08-27 CN CN 201020509555 patent/CN201781425U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101951176A (en) * | 2010-08-27 | 2011-01-19 | 无锡华联科技集团有限公司 | Plasma power supply chopper |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110330 Termination date: 20130827 |