CN1035419C - 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
- CN1035419C CN1035419C CN95113019A CN95113019A CN1035419C CN 1035419 C CN1035419 C CN 1035419C CN 95113019 A CN95113019 A CN 95113019A CN 95113019 A CN95113019 A CN 95113019A CN 1035419 C CN1035419 C CN 1035419C
- Authority
- CN
- China
- Prior art keywords
- circuit
- switching tube
- control circuit
- slowly
- closing valve
- 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.)
- Expired - Fee Related
Links
Images
Abstract
In an electric inversion welder with high frequency of the present invention, a main switch current sampling circuit (4), a threshold comparing circuit (5), a monostable circuit (6), quick cut-off control circuit (7), a feedback sampling circuit (8), a PWM control circuit (9) and a slow cut-off control circuit (10) additionally arranged on the present invention form a protective method and a circuit for quickly switching off and slowly switching on power switch tube. The present invention prevents switch tubes from frequent current overshoots, enhances safety and reliability, and lowers the requirement to type selection. Products using the present invention have the advantages of high work stability, low production cost, light weight, small size and energy saving. The present invention can be widely used for many kinds 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.The fluctuation of load is very big during electric welding machine work; saltus step between the zero load of being everlasting, heavy duty and short circuit, because it is power supply switch tube frequently is subjected to the overcurrent impact that short circuit causes, very easily impaired; so adopt holding circuit to make it avoid damaging, as described at utility model patent (ZL93234161.6).At present the guard method of adopting 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 dutycycle 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 detection reaction speed is fast, 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 dutycycle that the objective of the invention is to design a kind of PWM control of making power supply switch tube of having no progeny in the pass slowly increases, can not be subjected to continually overcurrent impacts, 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.
In order to realize above-mentioned purpose of the present invention; according to the guard method that the present invention proposes a kind of high frequency inversion electric welder power supply; this welder power mainly is by the inversion main switch; high frequency transformer; hf rectifier is formed; adopt the main switch current sampling circuit; the threshold values comparison circuit; monostable circuit; the quick closing valve control circuit; feedback sampling circuit and pwm control circuit; and drive control circuit slowly and form the protection that power supply switch tube is turn-offed fast; it is characterized in that: during overcurrent in detecting the welding machine electric power switching tube; carry out quick closing valve control for the first time; after the first time, quick closing valve control was carried out; the dutycycle of the PWM control of switching tube is increased gradually; switching tube is opened slowly; if after electric current; switching tube is controlled capable quick closing valve control once more, open slowly once more, to entering normal operating conditions to switching tube.
On the other hand; designed a kind of holding circuit of high frequency inversion electric welder power switch according to the present invention; this welder power mainly is by the inversion main switch; high frequency transformer; hf rectifier is formed; by the main switch current sampling circuit; the threshold values comparison circuit; monostable circuit; quick closing valve control circuit and pwm control circuit constitute the holding circuit that power supply switch tube is turn-offed fast; it is characterized in that comprising that is also driven a control circuit slowly in this welder power switching tube holding circuit; it is connected between monostable circuit and the pwm control circuit; when the switching tube overcurrent; at first carry out quick closing valve control by the quick closing valve control circuit; this is driven control circuit slowly the dutycycle of the PWM control of switching tube is increased gradually when starting shooting once more; switching tube is slowly opened; if switching tube is after stream; carry out quick closing valve control again; start is opened open pipe slowly again, to entering normal operating conditions to switching tube.
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 driving 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 of opening slowly of the present invention among the figure in the empty square frame, its input A point is with 3 pin of the same order of quick closing valve 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 going up) 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 pass through resistance (R) electric capacity (C) discharge, level slowly descends, thus pulsewidth progressively increase, thereby realize open-minded slowly.
Claims (2)
1. the guard method of a power supply switch tube of high frequency inversion electric welder; this welder power mainly is by inversion main switch (1); high frequency transformer (2); hf rectifier (3) is formed; 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) and pwm control circuit (9); and drive control circuit (10) slowly and form the protection that power supply switch tube is turn-offed fast; it is characterized in that: during overcurrent in detecting the welding machine electric power switching tube; carry out quick closing valve control for the first time; after the first time, quick closing valve control was carried out; the dutycycle of the PWM control of switching tube is increased gradually; switching tube is opened slowly; if after electric current; switching tube is controlled capable quick closing valve control once more; slowly open once more, to entering normal operating conditions to switching tube.
2. the holding circuit of a power supply switch tube of high frequency inversion electric welder; this welder power mainly is by inversion main switch (1); high frequency transformer (2); hf rectifier (3) is formed; by main switch current sampling circuit (4); threshold values comparison circuit (5); monostable circuit (6); quick closing valve control circuit (8) constitutes the holding circuit that power supply switch tube is turn-offed fast with pwm control circuit (9); it is characterized in that also comprising in this welder power switching tube holding circuit that is driven a control circuit (10) slowly; it is connected between monostable circuit (6) and the pwm control circuit (9); when the switching tube overcurrent; at first carry out quick closing valve control by quick closing valve control circuit (8); this is driven control circuit (10) slowly the dutycycle of the PWM control of switching tube is increased gradually when starting shooting once more; switching tube is slowly opened; if switching tube is after stream; carry out quick closing valve control again; start is opened open pipe slowly again, to entering normal operating conditions to switching tube.
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 CN1124185A (en) | 1996-06-12 |
| CN1035419C true 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 (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 |
Families Citing this family (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 |
| 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 |
| 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 |
Citations (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
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2159852Y (en) * | 1993-06-21 | 1994-03-30 | 梁读勇 | Electric welder |
Cited By (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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1124185A (en) | 1996-06-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100344402C (en) | Method and system for reducing splash in gas shielded welding of short-circuiting transfer | |
| CN101318242A (en) | Numerical control double-power mode multifunctional impulsing power source for electrospark wire-electrode cutting processing | |
| CN1033448A (en) | The method and apparatus of control short-circuit welding system | |
| CN101043966A (en) | Dc-dc converter with over-voltage protection circuit | |
| CN101862881A (en) | Gas-protective submerged-arc welding digitalized power supply system for dual ARM (Automated Route Management) control and control method thereof | |
| CN110421237B (en) | LLC-based double-wire pulse MIG welding power supply system and control method | |
| CN1035419C (en) | Protective method and circuit for power supply switch tube of high frequency inversion electric welder | |
| CN105932864A (en) | Intelligent IGBT (insulated gate bipolar transistor) constant-current driving device | |
| CN109375087A (en) | A kind of protection circuit and method with high speed detection IGBT short trouble | |
| CN109483020A (en) | A kind of intelligent control gas shielded welding machine with liquid crystal display | |
| CN101318240B (en) | Numerical control pulse power source for wire-electrode cutting processing | |
| CN205657421U (en) | Electromagnetic heating system and voltage surge protection device thereof | |
| CN113319402A (en) | Gas circuit control system and method for argon arc welding machine | |
| CN201175797Y (en) | High-low pressure composite pulse power source for processing small holes by electrical spark method | |
| CN201717799U (en) | Gas shielded submerged arc weld digital power supply system with double ARM control | |
| CN1745952A (en) | Circuit for sulting pole-changing plasma arc welding twin arc | |
| CN201235432Y (en) | Numerical control current pulse power source for electrospark wire-electrode cutting machining | |
| CN210013269U (en) | Two fender frequency modulation's quartering hammer control system and excavator | |
| CN205829454U (en) | A kind of intelligentized IGBT constant current driving device | |
| CN104959720B (en) | Air plasma cutter sequential control method | |
| CN1042601C (en) | Method for controlling inverse arc-welding power source time-varying output characteristics for carbon dioxide welding | |
| CN107598348A (en) | The sequential control method of air plasma cutter | |
| CN1280057C (en) | Anti-shock protector of full electronic intelligent electric arc welder | |
| CN208099568U (en) | Arc ignition circuit for argon arc welding machine | |
| CN201089058Y (en) | Electricity-saving mechanism for AC arc welder |
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 |