CN1124185A - Protective method and circuit for power supply switch tube of high frequency inversion electric welder - Google Patents
Protective method and circuit for power supply switch tube of high frequency inversion electric welder Download PDFInfo
- Publication number
- CN1124185A CN1124185A CN 95113019 CN95113019A CN1124185A CN 1124185 A CN1124185 A CN 1124185A CN 95113019 CN95113019 CN 95113019 CN 95113019 A CN95113019 A CN 95113019A CN 1124185 A CN1124185 A CN 1124185A
- Authority
- CN
- China
- Prior art keywords
- circuit
- control circuit
- high frequency
- power supply
- switch tube
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Generation Of Surge Voltage And Current (AREA)
Abstract
The present invention adds a slow cut-off control circuit in a high frequency inversion power supply of welding machine comprised of master switch current sampling circuit, threshold comparing circuit, monostable circuit, quick cutt-off control circuit, feedback sampling circuit and PWM control circuit to form a quick cutt-off slow switch-on protecting circuit for power source switch tube. It protects the switch tube from frequent current overshots, increases its safety and reliability. It can be used in every variety of metal welding.
Description
The invention belongs to field of switch power, is guard method and circuit about a kind of power supply switch tube of high frequency inversion electric welder.
In recent years, electric welding machine has developed into the high-frequency inversion mode, and often more than 20KHZ, its power supply switch tube often adopts devices such as MOSFET, IGBT to operating frequency.Electric welding machine when work fluctuation of load is very big, and saltus step between the zero load of being everlasting, heavy duty and short circuit is impacted because power supply switch tube frequently is subjected to the overcurrent that short circuit causes, and is very easily impaired, so adopt holding circuit to make it avoid damage.Currently used guard method as shown in Figure 1; the protection philosophy of this circuit is that in a single day the quick closing valve control circuit detects just shutoff of overcurrent; (millisecond magnitude) starts shooting once more after waiting for official hour; this moment is because the front is an off-mode; the angle of flow of starting shooting once more is very big, if load this moment still is in short-circuit condition, will break through a very big peak current on the power supply switch tube; after detecting this electric current, circuit can turn-off once more.If the detection reaction speed of design is slow, will cause overshoot current, if it is fast to detect response speed, be subject to again disturb.Therefore in circuit design, often select the bigger switching tube of capacity for use, thereby increased the cost of product in order to increase reliability.For switching tube frequently is not hit, if during overcurrent the unused time of holding circuit be provided with longerly, can cause again and open the arc difficulty and require to improve the protection point, require very high to the impact resistance of switching tube.In addition, some circuit except improving the protection point, also improve temporal properties in order frequently not enter guard mode, cause usually instability when operate as normal easily of circuit, have caused the not steady of output current on the contrary.
The objective of the invention is to design a kind of pass power supply switch tube angle of flow of having no progeny and slowly open, can not be subjected to continually overcurrent and impact, can reduce to switching tube capacity requirement, improve product stability, reduce the guard method and the circuit of the welder power switching tube of product cost.
Design of the present invention is to increase by one to close control circuit (10) slowly, has no progeny thereby power supply switch tube is closed, and the angle of flow can slowly be opened.Circuit theory diagrams of the present invention as shown in Figure 2,1 is that inversion main switch, 2 is that high frequency transformer, 3 is hf rectifier among the figure, 4 is that main switch current sampling circuit, 5 is that threshold values comparison circuit, 6 is that monostable circuit, 7 is the quick closing valve control circuit, 8 is that feedback sampling circuit, 9 is pwm control circuit, and 10 are the control circuit that closes slowly of the present invention.Protection philosophy of the present invention be when detect the power switch tube current excessive after, turn-off rapidly, wait for official hour after; the mode that adopts the angle of flow slowly to open when starting shooting once more is if still be in the short circuit overcurrent state, the electric current upper punch; when arriving preset protection point, turn-off rapidly once more.Owing to open slowly, electric current can overshoot.When the short circuit overcurrent state was left in load, circuit recovered normal condition.
The invention has the advantages that, adopt soon and turn-off that the mode of opening slowly makes on the switching tube electric current can overshoot, thereby strengthened security, the reliability of switching tube greatly, the requirements of type selecting to switching tube reduces simultaneously, reduces the cost of product.Protect safer, the dynamic characteristic in loop is not needed very fast, thereby stability greatly improves during operate as normal.Be operated in upper frequency, thereby make that product weight is light, volume is little, be easy to carry, energy saving, can be widely used in the welding of multiple metal, particularly stainless steel, non-ferrous metal etc.
Description of drawings.
Fig. 1 is the circuit theory diagrams of the switching tube holding circuit in existing high-frequency inversion electric welding and the power supply.
Fig. 2 is the circuit theory diagrams of the holding circuit of the switching tube in the high frequency inversion electric welder power supply of the present invention, and 1 is that inversion main switch, 2 is that high frequency transformer, 3 is that hf rectifier, 4 is that main switch current sampling circuit, 5 is that threshold values comparison circuit, 6 is that monostable circuit, 7 is that quick closing valve control circuit, 8 is that feedback sampling circuit, 9 is that pwm control circuit, 10 is for closing control circuit slowly among the figure.
Fig. 3 is an embodiment of the invention circuit.
Below in conjunction with accompanying drawing 3 explanations preferred forms of the present invention, be the control circuit that closes slowly of the present invention among the figure in the empty square frame, it is made of element R, T, C, and its input A point is with 3 pin of the fast the same order of point control circuit steady (555), and output B point connects 3 pin of PWM (494).During work, when current sample point (X point) detection electric current was excessive, the A point jumped to high level from low level, and the C point is blocked to low level, driving signal by pincers, realizes (about 1～2 μ s) shutdown fast.The B point also becomes high level (progressively rising) in the time of shutdown, signal is turned off.The high level that A is ordered is kept about 1～2ms, because 555 constitute a monostable, when monostable recovery, A level point step-down (0 level), C point recover normally immediately, and driving signal can pass through, but because B point high level will discharge by RC, level slowly descends, thus pulsewidth progressively increase, thereby realize open-minded slowly.
Claims (2)
1. one kind mainly by inversion main switch (1); high frequency transformer (2); the high frequency inversion electric welder that hf rectifier (3) constitutes; adopt main switch current sampling circuit (4); threshold values comparison circuit (5); monostable circuit (6); quick closing valve control circuit (7); feedback sampling circuit (8) forms guard method and the circuit that power supply switch tube is turn-offed fast with pwm control circuit (9); it is characterized in that being connected one between monostable circuit and pwm control circuit closes control circuit (10) slowly; this circuit is with the level signal of monostable circuit output; deliver to pwm control circuit after progressively changing; switching tube closes fast and has no progeny when overcurrent; pulsewidth progressively increases when starting shooting once more, and the angle of flow of switching tube is slowly opened.
2. by the guard method and the circuit of the described power supply switch tube of high frequency inversion electric welder of claim 1, it is characterized in that closing slowly control circuit by being that the circuit that element R, T, C constitute is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95113019A CN1035419C (en) | 1995-10-06 | 1995-10-06 | Protective method and circuit for power supply switch tube of high frequency inversion electric welder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN95113019A CN1035419C (en) | 1995-10-06 | 1995-10-06 | Protective method and circuit for power supply switch tube of high frequency inversion electric welder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1124185A true CN1124185A (en) | 1996-06-12 |
| CN1035419C CN1035419C (en) | 1997-07-16 |
Family
ID=5079812
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN95113019A Expired - Fee Related CN1035419C (en) | 1995-10-06 | 1995-10-06 | Protective method and circuit for power supply switch tube of high frequency inversion electric welder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1035419C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101425797B (en) * | 2007-11-01 | 2011-07-13 | 深圳迈瑞生物医疗电子股份有限公司 | Slow opening fast shutting electronic switch circuit and control method thereof |
| CN102794547A (en) * | 2012-08-04 | 2012-11-28 | 深圳市瑞凌实业股份有限公司 | Pilot arc chopped wave control circuit and cutting machine |
| CN109807435A (en) * | 2018-12-28 | 2019-05-28 | 上海沪工焊接集团股份有限公司 | Inverter type welder and its protection control circuit |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1073435C (en) * | 1999-04-16 | 2001-10-24 | 张克尽 | Infantile plaster for relieving cough |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2159852Y (en) * | 1993-06-21 | 1994-03-30 | 梁读勇 | Electric welder |
-
1995
- 1995-10-06 CN CN95113019A patent/CN1035419C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101425797B (en) * | 2007-11-01 | 2011-07-13 | 深圳迈瑞生物医疗电子股份有限公司 | Slow opening fast shutting electronic switch circuit and control method thereof |
| CN102794547A (en) * | 2012-08-04 | 2012-11-28 | 深圳市瑞凌实业股份有限公司 | Pilot arc chopped wave control circuit and cutting machine |
| CN102794547B (en) * | 2012-08-04 | 2014-10-29 | 深圳市瑞凌实业股份有限公司 | Pilot arc chopped wave control circuit and cutting machine |
| CN109807435A (en) * | 2018-12-28 | 2019-05-28 | 上海沪工焊接集团股份有限公司 | Inverter type welder and its protection control circuit |
| CN109807435B (en) * | 2018-12-28 | 2021-02-26 | 上海沪工焊接集团股份有限公司 | Inverter welding machine and protection control circuit thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1035419C (en) | 1997-07-16 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100488690C (en) | DC-DC converter with over-voltage protection circuit | |
| US5633540A (en) | Surge-resistant relay switching circuit | |
| CN113345741B (en) | DC arc-extinguishing device | |
| CN1033448A (en) | The method and apparatus of control short-circuit welding system | |
| EP2381455B1 (en) | Hybrid fault current limiter | |
| CN109375087A (en) | A kind of protection circuit and method with high speed detection IGBT short trouble | |
| WO2015149579A1 (en) | Current monitoring type electronic arc-extinguishing apparatus | |
| CN105932864A (en) | Intelligent IGBT (insulated gate bipolar transistor) constant-current driving device | |
| CN205657421U (en) | Electromagnetic heating system and voltage surge protection device thereof | |
| CN1124185A (en) | Protective method and circuit for power supply switch tube of high frequency inversion electric welder | |
| CN102543578A (en) | Real-time control intelligent alternating-current contactor with full-closed loops | |
| CN1821809A (en) | Electric exploration signal transmitter | |
| CN105490513A (en) | Inversion output over-current protection method | |
| CN1271759C (en) | Laser power source of semiconductor pumping laser mark printer | |
| CN214956721U (en) | Solid-state direct current breaker | |
| CN104959720A (en) | Sequential control method for air plasma cutter | |
| CN2891428Y (en) | Power supply unit | |
| CN1280057C (en) | Anti-shock protector of full electronic intelligent electric arc welder | |
| CN110880745B (en) | Active resistance-capacitance type direct current limiter based on double-capacitance oscillation and control method | |
| CN112737287A (en) | Direct-current low-side driving switch circuit with short circuit and overload protection functions | |
| CN115132544A (en) | Solid-state direct-current circuit breaker and control method thereof | |
| CN108599748B (en) | Switch element protection circuit, protection method and protection device | |
| CN2244769Y (en) | Arc-free breaker for dc electrical appliance with contacts | |
| CN204316835U (en) | With the LED drive circuit of sampling resistor protection | |
| CN2453638Y (en) | Constant current laser power source for laser carving machine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |