CN201717793U - Power switch circuit for welding machine - Google Patents
Power switch circuit for welding machine Download PDFInfo
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- CN201717793U CN201717793U CN2010202895634U CN201020289563U CN201717793U CN 201717793 U CN201717793 U CN 201717793U CN 2010202895634 U CN2010202895634 U CN 2010202895634U CN 201020289563 U CN201020289563 U CN 201020289563U CN 201717793 U CN201717793 U CN 201717793U
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Abstract
The utility model relates to a power switch circuit for a welding machine, which belongs to the technical field of power switches and comprises a switch, a rectifier bridge, a capacitor, a current-limiting resistor, a relay and a transformer. The power switch circuit is characterized in that alternating-current is split into two circuits when inputting circuit. One branch circuit of a first circuit is directly connected with one alternating end of the rectifier bridge, and the other branch circuit of the first circuit is connected with one end of the transformer through a first contact. One branch circuit of a second circuit is in series connection with the current-limiting resistor through the second contact of the switch and then in parallel connection with a relay contact, and is then connected with the other alternating end of the rectifier bridge; and the other branch circuit of the second circuit passes through the second contact of the switch to control the other end of the transformer. Due to small operating current, a small power switch can be used in the power switch circuit, so as to reduce component cost. Also, the power switch is not easy to generate heat, so as to greatly prolong the service life and improve the efficiency of the entire welding machine.
Description
Technical field
The utility model relates to the mains switch technical field, relates in particular to a kind of welding machine electric power switching circuit.
Background technology
Electric welding machine is a kind of industrial instrument commonly used, and along with industrial expansion, the welding machine of employing single phase poaer supply power supply in industrial application more and more widely.In the welding machine of initial employing single phase poaer supply power supply, single-phase line voltage behind switch, is delivered to the rectifier bridge rectification from alternating current AC input electric welding machine, obtains negative just down direct voltage after the rectification, and the inverter that this voltage is delivered to the back carries out the PWM inversion.Another road is an electric welding machine control section power supply, is the control circuit board power supply by delivering to control transformer behind the switch.But in the electric welding machine start at that moment, electric capacity tends to produce huge electric current, and the line voltage input circuit that comprises mains switch and rectifier bridge is brought very big impact, causes the damage of mains switch and rectifier bridge.
Therefore, in the welding machine that adopts the single phase poaer supply power supply, people have adopted soft start switch circuit shown in Figure 1.Its operation principle is: single-phase line voltage is from AC input electric welding machine, behind switch 101, deliver to rectifier bridge 102 rectifications with the contact of current-limiting resistance 104 and soft start relay, obtain negative just down direct voltage after the rectification, the inverter that this voltage is delivered to the electric welding machine back carries out the PWM inversion.Another road is an electric welding machine control section power supply, is the control circuit board power supply by delivering to control transformer behind the switch 101.In start at that moment, there is not voltage on the capacitor 103.Simultaneously, control circuit board is not given a of the line bag 106 of soft start relay 105, the b end send, the relay open circuit, input current can only be by being connected in parallel in A with soft start relay contact 105, by rectifier bridge 102 being rectified into direct current after current-limiting resistance 104 current limlitings that B at 2 is that capacitor 103 slowly charges, on capacitor 103, get voltage and be charged to certain value, control board send just for the line bag 106 of soft start relay 105, soft start relay 105 just must be established by cable logical, and power network current flows through smoothly by the contact of relay 105.Because of capacitor 103 voltages are the zero start surge heavy current impact that causes, mains switch 101 and rectifier bridge 102 start instantaneous large-current impact failures have been prevented effectively in the time of will avoiding starting shooting like this.
Though above-mentioned soft start switch circuit can play the protective effect of soft start,, exist some shortcomings in this circuit, as: the components and parts cost is higher; During electric welding machine work, the input current of electric welding machine can flow through switch 101 always, causes switch 101 to be easy to heating and damages; And during electric welding machine work, the input current of electric welding machine can flow through switch 101 always, also will flow through the contact of soft start relay 105 simultaneously.Can cause the thermal losses of two places forming voltage drop on the contact of switch 101 and on the contact of soft start relay 105, can the slight efficient that reduces complete machine.
Summary of the invention
For overcoming above-mentioned defective, the purpose of this utility model promptly is to provide a kind of welding machine electric power switching circuit.
The purpose of this utility model is achieved through the following technical solutions:
A kind of welding machine electric power switching circuit of the utility model comprises:
Switch, rectifier bridge, capacitor, current-limiting resistance, relay and transformer, alternating current is divided into two-way when input circuit, one branch road of the first via is directly connected to an interchange end of rectifier bridge, and another branch road of the first via is connected to transformer one end through first contact of switch; A branch road of the second tunnel by switch second contact and the current-limiting resistance series connection after behind the branch road in parallel with relay contact again, another that is connected to rectifier bridge exchanges end; Another branch road of the second tunnel is by arriving the control transformer other end behind second contact of switch;
When switch closure, switch two contact UNICOMs, the transformer conduction, the electric welding machine control loop enters operating state; In switch closure, power network current enters current-limiting resistance through a contact of switch, and described current-limiting resistance carries out current limliting to electric current; Enter rectifier bridge through the electric current after the current limliting, described rectifier bridge carries out rectification to electric current; Electric current enters capacitor after rectification, described capacitor begins to charge slowly; Described control loop is given the line bag power supply of relay behind preset time, make that the contact of relay is closed after the capacitor charging is finished, and finishes soft start-up process.
Compare with the electric welding machine soft starting circuit that traditional single phase poaer supply is powered, switch in the utility model only turns on and off very little electric current, be required electric current of control transformer and the soft start electric current that flows through current-limiting resistance, this electric current only is 1/tens of the specified input current of electric welding machine.Because the operating current of mains switch is very little in the utility model, therefore in this circuit, can select little current switch for use, to reduce the components and parts cost, and mains switch is difficult for heating, working life is prolonged greatly, moreover, because the minimizing of thermal losses, make the efficient of complete machine of electric welding machine increase.
Description of drawings
In order to be easy to explanation, the utility model is done to describe in detail by following preferred embodiment and accompanying drawing.
Fig. 1 is the electrical block diagram of prior art;
Fig. 2 is the structural representation of a kind of welding machine electric power switching circuit of the utility model.
Embodiment
In order to make the purpose of this utility model, technical scheme and advantage clearer,, the utility model is further elaborated below in conjunction with drawings and Examples.Should be appreciated that specific embodiment described herein only in order to explanation the utility model, and be not used in qualification the utility model.
Please referring to Fig. 2, a kind of welding machine electric power switching circuit of the utility model is specially:
Single-phase line voltage is from alternating current AC input electric welding machine and be divided into two-way, and a branch road of the first via is directly connected to an interchange end of rectifier bridge 202, and another branch road of the first via arrives control transformer one end through switch 201 upper contacts.After being a branch road with soft start relay 205 contacts are in parallel again after a branch road of the second tunnel is connected by switch 201 lower contact and current-limiting resistance, be connected to another interchange end of rectifier bridge.Another branch road of the second tunnel is by arriving the control transformer other end after switch 201 lower contact.
When switch 201 disconnected, switch 201 upper contacts disconnected, and electric welding machine control transformer one end disconnects.Equally, switch 201 lower contact disconnect, and the electric welding machine control transformer other end also disconnects, and current-limiting resistance 204 also is disconnected.Like this, because the control transformer two ends all disconnect with electrical network, control transformer does not have electricity, and the electric welding machine control loop is not worked, the line Bao Wudian of soft start relay 205, and soft start relay 205 is not closed.And because current-limiting resistance 204 is disconnected, line voltage has only an interchange end to be connected with rectifier bridge 202.Electric welding machine can not imported power network current.Do not have direct voltage on the capacitor 203.
When switch 201 closures, switch 201 upper contacts UNICOMs, lower contact is UNICOM also, control transformer conduction, the work of electric welding machine control loop.Simultaneously, current-limiting resistance 204 is access circuit also, and power network current enters current-limiting resistance 204 through switch 201 lower contact, and current-limiting resistance carries out current limliting, and electric current carries out rectification through entering rectifier bridge 202 after the current limliting, slowly charging of capacitor 203 beginnings after rectification.Through behind the preset time, control circuit can be given line bag 206 power supplies of soft start relay 205, makes that the contact of soft start relay 205 is closed after capacitor 203 chargings are finished, and finishes soft start-up process.
The above only is preferred embodiment of the present utility model; not in order to restriction the utility model; all any modifications of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the protection range of the present utility model.
Claims (1)
1. welding machine electric power switching circuit, comprise switch, rectifier bridge, capacitor, current-limiting resistance, relay and transformer, it is characterized in that: alternating current is divided into two-way when this welding machine electric power switching circuit of input, one branch road of the first via is directly connected to an interchange end of rectifier bridge, and another branch road of the first via is connected to transformer one end through first contact of switch; A branch road of the second tunnel by switch second contact and the current-limiting resistance series connection after behind the branch road in parallel with relay contact again, another that is connected to rectifier bridge exchanges end; Another branch road of the second tunnel is by arriving the control transformer other end behind second contact of switch;
During switch closure, switch two contact UNICOMs, the transformer conduction, the electric welding machine control loop enters operating state; In switch closure, power network current enters current-limiting resistance through a contact of switch, and described current-limiting resistance carries out current limliting to electric current; Enter rectifier bridge through the electric current after the current limliting, described rectifier bridge carries out rectification to electric current; Electric current enters capacitor after rectification, described capacitor begins to charge slowly; Described control loop is given the line bag power supply of relay behind preset time, make that the contact of relay is closed after the capacitor charging is finished, and finishes soft start-up process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202895634U CN201717793U (en) | 2010-08-12 | 2010-08-12 | Power switch circuit for welding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202895634U CN201717793U (en) | 2010-08-12 | 2010-08-12 | Power switch circuit for welding machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201717793U true CN201717793U (en) | 2011-01-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202895634U Expired - Fee Related CN201717793U (en) | 2010-08-12 | 2010-08-12 | Power switch circuit for welding machine |
Country Status (1)
| Country | Link |
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| CN (1) | CN201717793U (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102611290A (en) * | 2012-03-16 | 2012-07-25 | 株洲南车时代电气股份有限公司 | Power supply circuit for low voltage test system of locomotive |
| CN102709113A (en) * | 2012-06-01 | 2012-10-03 | 张家港市泓溢电源科技有限公司 | Soft starting circuit and anti-impact control method for main loop |
| CN102768919A (en) * | 2012-06-15 | 2012-11-07 | 张家港市泓溢电源科技有限公司 | Soft-start circuit |
| CN104201913A (en) * | 2014-08-29 | 2014-12-10 | 上海沪工焊接集团股份有限公司 | Welding machine switch control circuit |
| CN109921654A (en) * | 2019-04-18 | 2019-06-21 | 陕西铁路工程职业技术学院 | A kind of single switch high-frequency induction brazing power supply |
| CN111564962A (en) * | 2020-05-23 | 2020-08-21 | 上海沪工焊接集团股份有限公司 | Anti-surge current limiting circuit and method applied to inverter welding machine power supply |
-
2010
- 2010-08-12 CN CN2010202895634U patent/CN201717793U/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102611290A (en) * | 2012-03-16 | 2012-07-25 | 株洲南车时代电气股份有限公司 | Power supply circuit for low voltage test system of locomotive |
| CN102709113A (en) * | 2012-06-01 | 2012-10-03 | 张家港市泓溢电源科技有限公司 | Soft starting circuit and anti-impact control method for main loop |
| CN102768919A (en) * | 2012-06-15 | 2012-11-07 | 张家港市泓溢电源科技有限公司 | Soft-start circuit |
| CN102768919B (en) * | 2012-06-15 | 2015-06-24 | 张家港市泓溢电源科技有限公司 | Soft-start circuit |
| CN104201913A (en) * | 2014-08-29 | 2014-12-10 | 上海沪工焊接集团股份有限公司 | Welding machine switch control circuit |
| CN109921654A (en) * | 2019-04-18 | 2019-06-21 | 陕西铁路工程职业技术学院 | A kind of single switch high-frequency induction brazing power supply |
| CN111564962A (en) * | 2020-05-23 | 2020-08-21 | 上海沪工焊接集团股份有限公司 | Anti-surge current limiting circuit and method applied to inverter welding machine power supply |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C53 | Correction of patent for invention or patent application | ||
| C56 | Change in the name or address of the patentee | ||
| CB03 | Change of inventor or designer information |
Inventor after: Yang Zhenwen Inventor after: Wu Yuetao Inventor before: Yang Zhenwen |
|
| COR | Change of bibliographic data |
Free format text: CORRECT: INVENTOR; FROM: YANG ZHENWEN TO: YANG ZHENWEN WU YUETAO |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 518001 Guangdong city of Shenzhen province Nanshan District Xili town honghualing Industrial District Three District Building Patentee after: Shenzhen Huayilong Industrial Development Co., Ltd Address before: 518001 Guangdong city of Shenzhen province Nanshan District Xili town honghualing Industrial District Three District Building Patentee before: Shenzhen HuaYiLong Industrial Development Co., Ltd. |
|
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20110119 Termination date: 20190812 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |