CN201601661U - Three-in-one electric welder function conversion control circuit - Google Patents
Three-in-one electric welder function conversion control circuit Download PDFInfo
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- CN201601661U CN201601661U CN2010200566350U CN201020056635U CN201601661U CN 201601661 U CN201601661 U CN 201601661U CN 2010200566350 U CN2010200566350 U CN 2010200566350U CN 201020056635 U CN201020056635 U CN 201020056635U CN 201601661 U CN201601661 U CN 201601661U
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Abstract
The utility model relates to a three-in-one electric welder function shifting control circuit, which comprises a single-pole three-throw switch, a conversion contactor, a pulse width modulator PWM and a triode mono-stable delay circuit. The single-pole three-throw switch is used for function conversion; the conversion contactor is correspondingly electrically connected; a dynamic contact of the three-throw switch interchanges among three static contacts; the three static contacts respectively correspond to plasma arc cutting, manual arc welding and argon arc welding; the dynamic contact of the three-throw switch interchanges the static contacts under the condition of load carrying; the conversion contactor has corresponding interchanges; an A contact and a C contact at two ends of the three static contacts are respectively connected to a signal input end of the triode mono-stable delay circuit; an output end of the triode mono-stable delay circuit is electrically connected with a soft starting end of the pulse width modulator PWM; and a modulation pulse output end of the pulse width modulator PWM is electrically connected with a main circuit of an electric welder through an electric potential isolation and driving circuit in order to control electric power output of the main circuit.
Description
Technical field the utility model relates to arc welding or ARC CUTTING, and the electric welding machine circuit structure of plasma welding or cutting, particularly relates to the protective circuit of three usefulness one electric welding machine functions conversion contactor.
Background technology prior art electric welding machine comprises according to the welding manner difference: manual electric arc welding, argon arc welding machine, carbon dioxide gas arc welding machine, argon arc spot welding machine, carbon arc type gas gouging machine or the like, promptly unit can only be realized a kind of welding manner.Three usefulness one electric welding machines are meant on a source of welding current, realize direct current manual electric arc welding, argon arc welding and three kinds of functions of air plasma cutting, a machine three-use with the optimality price ratio.
The difference of argon arc welding and manual electric arc welding relates to internal circuit except the welding gun that has that it's too late of gas cylinder is different, the former is many, and the generation of high-frequency high-voltage current, control circuit, supercharging play arc circuit, high frequency protection etc., and these are all under the control of hand switch.On the basis of manual welding machine, only need to change the primary and secondary turn ratio of main transformer, interpolation hand switch and described various circuit also places control circuit under the control of hand switch, can realize argon arc welding.Change welding gun during use, add gas cylinder.And the main distinction of plasma cutting machine and argon arc welding machine is the variation of output voltage, output current, cutting machine output voltage height, and output current is low.Use two or more sources of welding current simultaneously, the conversion by in parallel and series system just can realize the conversion of output voltage, electric current easily, thereby adapt to different needs.The conversion of argon arc welding machine and plasma cutting machine also is based on such principle, and when power supply was in parallel, output voltage was low, electric current is big, at this moment, and as the main power source of argon arc welding machine; During series connection, voltage height, electric current are little, are plasma cut state main power source.Usually, in side circuit, the conversion of electric power output voltage, electric current is to realize by the connecting relation that changes main transformer winding time limit.
The main power component of three usefulness one electric welding machines has: switching tube, main transformer, rectifier diode and reactor etc., these power components are shared fully.This all-in-one is the contact open and-shut mode that changes two contactors of main circuit by control circuit, changes main transformer secondary side series and parallel connected mode, reaches the purpose of a tractor serves several purposes.In actual use, must be at handoff functionality under the Light Condition, because do not have output current under the Light Condition, the conversion contacts of contactor does not have loss.If under band year state, switch,, be easy to cause contacts of contactor to ablate and dynamic and static contact weld because output current is very big.It generally is to adopt the mode of specification and warning labeling that prior art is tackled this situation, reminds the user to be with and carries handoff functionality, but still can take place in actual applications to switch the situation that causes contactor to damage because band carries.Or on the dynamic and static contact of contactor energy when absorbing circuit and switching in parallel to receive contact web to carry, but still can't tackle the problem at its root.
Utility model content the technical problems to be solved in the utility model is to avoid above-mentioned the deficiencies in the prior art part and proposes the control circuit of a kind of three usefulness one electric welding machine functions conversion; be used for when the electric welding machine function is changed; automatically block electric welding machine main circuit output no longer than 1 time in second; after the described blockade of waiting is removed; described function conversion is finished, thereby realizes that electric welding machine carries out the function conversion and protected the conversion contactor not to be damaged under band year state.
The utility model solve the technical problem can be by realizing by the following technical solutions:
Design a kind of control circuit of three usefulness one electric welding machine functions conversion, be used for when the electric welding machine function is changed, automatically block electric welding machine main circuit output no longer than 1 time in second, after the described blockade of waiting is removed, described function conversion is finished, thereby realizes that electric welding machine carries out the function conversion and protected the conversion contactor not to be damaged under band year state; Comprise the SP3T switch and the corresponding conversion contactor that is electrically connected that are used for the function conversion, the described moving contact of throwing three switches advances changing-over between three fixed contacts: the corresponding respectively plasma cutting of these three fixed contacts, manual electric arc welding close argon arc welding; When the moving contact of described three throw switches when band carries under the situation changing-over fixed contact, described conversion contactor has corresponding changing-over; Also comprise pulse-width modulator PWM and triode monostable time delay circuit; The A contact at the two ends of described three fixed contacts and C contact are connected to the signal input part of described triode monostable time delay circuit respectively, and the output of described triode monostable time delay circuit is electrically connected with the soft start end of described pulse-width modulator PWM; The modulating pulse output of described pulse-width modulator PWM is electrically connected with the main circuit of electric welding machine with the electric power of control main circuit through potential isolation river drive circuit and exports.
Described triode monostable time delay circuit comprises the first triode Q1, the second triode Q2 and the 3rd triode Q3; The described first triode Q1 and the second triode Q2 are the NPN type, and described the 3rd triode Q3 is a positive-negative-positive; The C contact at the two ends of described three throw switches, three fixed contacts and A contact are connected to the base stage of the described first triode Q1 respectively through the first diode D1 and the second diode D2; The emitter of the first triode Q1 is connected to the base stage of the second triode Q2 through the 3rd capacitor C 3 and the 5th resistance R 5 and the 5th diode D5, the emitter of the first triode Q1 connects the positive pole of the 3rd capacitor C 3, and the negative electrode of the 5th diode connects the base stage of the second triode Q2; The base stage of the 3rd triode Q3 is connected with the emitter of the first triode Q1 through the 4th diode D4, the 5th resistance R 5 and the 3rd capacitor C 3; The emitter of this first triode Q1 is simultaneously through the 3rd resistance R 3 ground connection; The negative electrode of the 3rd diode D3 is connected the plus earth of the 3rd diode D3 with the anode of the 4th diode D4, the base stage of the 3rd triode Q3; The collector electrode of the second triode Q2 and the emitter of the 3rd triode Q3 are connected soft start end 8 pin of described pulse-width modulator PWM in the lump, and the collector electrode of the emitter of the second triode Q2 and the 3rd triode Q3 is ground connection respectively.
Described the 3rd capacitor C 3 is electrochemical capacitor 10 μ F/25V, and described the 5th resistance R 5 is 20k Ω.
Compare with prior art; the beneficial effect of the control circuit of the utility model three usefulness one electric welding machine functions conversion is: when electric welding machine carries out the function conversion under band year state; can block the electric welding machine main circuit output of one period short time automatically; after the described blockade of waiting is removed; described function conversion is finished; thereby realize that electric welding machine carries out the function conversion and protected the conversion contactor not to be damaged under band year state, improve the reliability and the fail safe of electric welding machine.
Description of drawings
Fig. 1 is the schematic block circuit diagram that adopts three usefulness one electric welding machines of the utility model control circuit;
Fig. 2 is the circuit structure diagram of the control circuit of the utility model three usefulness one electric welding machines.
Embodiment is described in further detail below in conjunction with the preferred embodiment shown in the accompanying drawing.
A kind of control circuit of three usefulness one electric welding machine functions conversion, be used for when the electric welding machine function is changed, automatically block electric welding machine main circuit output no longer than 1 time in second, after the described blockade of waiting is removed, described function conversion is finished, thereby realizes that electric welding machine carries out the function conversion and protected the conversion contactor not to be damaged under band year state; As depicted in figs. 1 and 2, comprise the SP3T switch and the corresponding conversion contactor (figure does not draw) that is electrically connected that are used for the function conversion, the changing-over between three fixed contacts of the moving contact of described three throw switches: the corresponding respectively plasma cutting of these three fixed contacts, manual electric arc welding close argon arc welding, upper end position A contact correspondence is plasma cutting among Fig. 2, B contact, centre position correspondence be manual electric arc welding; Lower end position C contact correspondence be argon arc welding; When the moving contact of described three throw switches when band carries under the situation changing-over fixed contact, described conversion contactor has corresponding changing-over; Also comprise pulse-width modulator PWM and triode monostable time delay circuit; The A contact at the two ends of described three fixed contacts and C contact are connected to the signal input part of described triode monostable time delay circuit respectively, the output of described triode monostable time delay circuit is electrically connected with soft start end 8 pin of described pulse-width modulator PWM integrated circuit, if these soft start end 8 pin resets, promptly, make it be in low level, the electric power output of electric welding machine main circuit promptly is blocked; The modulating pulse output of described pulse-width modulator PWM is electrically connected with the main circuit of electric welding machine to control the electric power output of main circuit through potential isolation and drive circuit.
As shown in Figure 2, described triode monostable time delay circuit comprises the first triode Q1, the second triode Q2 and the 3rd triode Q3; The described first triode Q1 and the second triode Q2 are the NPN type, and described the 3rd triode Q3 is a positive-negative-positive; Described lower end position C contact and upper end position A contact are connected to the base stage of the described first triode Q1 respectively through the first diode D1 and the second diode D2; The emitter of the first triode Q1 is connected to the base stage of the second triode Q2 through the 3rd capacitor C 3 and the 5th resistance R 5 and the 5th diode D5, the emitter of the first triode Q1 connects the positive pole of the 3rd capacitor C 3, and the negative electrode of the 5th diode connects the base stage of the second triode Q2; The base stage of the 3rd triode Q3 is connected with the emitter of the first triode Q1 through the 4th diode D4, the 5th resistance R 5 and the 3rd capacitor C 3; The emitter of this first triode Q1 is simultaneously through the 3rd resistance R 3 ground connection; The negative electrode of the 3rd diode D3 is connected the plus earth of the 3rd diode D3 with the anode of the 4th diode D4 and the base stage of the 3rd triode Q3; The collector electrode of the second triode Q2 and the emitter of the 3rd triode Q3 are connected 8 pin of described pulse-width modulator PWM in the lump, and the collector electrode of the emitter of the second triode Q2 and the 3rd triode Q3 is ground connection respectively.
Described the 3rd capacitor C 3 is electrochemical capacitor 10 μ F/25V, and described the 5th resistance R 5 is 20k Ω.
The operation principle of the control circuit of the utility model three usefulness one electric welding machines is described below in conjunction with Fig. 1 and Fig. 2:
1. work as function switch and place upper end position A contact, be cutting function.24V voltage is added to the first triode Q1 base stage through the second diode D2, second resistance R 2, makes the first triode Q1 conducting, and the 3rd capacitor C 3 is high potential just very.Since electric capacity every straight effect, the negative electrode of (change over switch is motionless) the 4th diode D4 is an electronegative potential when stable state, the second triode Q2, the 3rd triode Q3 are in cut-off state.Therefore, 8 pin of integrated pulse-width modulator PWM are high potential, and normal output pwm signal makes the main circuit output power.
2. when change over switch transfers the manual welding function to by cutting, the movable contact that is switch switches to the B contact by the A contact, the current potential of the second diode D2 negative electrode is by high step-down, the first triode Q1 ends, because the voltage at the 3rd capacitor C 3 two ends can not suddenly change, the 3rd capacitor C 3 is through the 3rd resistance R 3, the 3rd diode D3, the 4th diode D4 and 5 discharges of the 5th resistance R, making the 3rd triode Q3 base stage is electronegative potential, the 3rd triode Q3 conducting, drag down the 8 pin current potentials of integrated pulse-width modulator PWM, block pwm signal, the main circuit no-output electric current of electric welding machine.The 3rd capacitor C 3 is after discharge after a while, and the 3rd triode Q3 ends again, and 8 pin of integrated pulse-width modulator PWM recover high potential, can normally export.Make time of the 3rd triode Q3 conducting be longer than time of switch transition through design, like this when switch transition, electric welding machine no-output electric current, thus protected the conversion contactor.
3. in like manner, when functional switch when manual welding forwards argon arc welding to, the moving contact that is switch switches to the C contact by the B contact, the first triode Q1 conducting, 12V voltage charges the second triode Q2 conducting through the 4th resistance R 4, the 5th resistance R 5, the 5th diode D5 to the 3rd capacitor C 3,8 pin that make integrated pulse-width modulator PWM are electronegative potential, block PWM output.Through time-delay, charging current is zero, arrives stable state, and the second triode Q2 ends again, and electric welding machine is output current normally.
The used main components and parts list of the utility model preferred embodiment:
Sequence number circuit symbol title specification
1 D1-D5 utmost point pipe 4148
2 Q1, Q2 NPN triode 8050
3 Q3 PNP triodes 8550
4 KZ function switch SP3Ts
5 U1 pulse width modulation integrated circuits 3525
6 C3 delay capacitors, 10 μ F/25V
7 R5 time delay resistance 20k Ω
Claims (3)
1. the control circuit of usefulness one electric welding machine function conversion, be used for when the electric welding machine function is changed, automatically block electric welding machine main circuit output no longer than 1 time in second, after the described blockade of waiting is removed, described function conversion is finished, thereby realizes that electric welding machine carries out the function conversion and protected the conversion contactor not to be damaged under band year state; Comprise the SP3T switch and the corresponding conversion contactor that is electrically connected that are used for the function conversion, the described moving contact of throwing three switches advances changing-over between three fixed contacts: the corresponding respectively plasma cutting of these three fixed contacts, manual electric arc welding close argon arc welding; When the moving contact of described three throw switches when band carries under the situation changing-over fixed contact, described conversion contactor has corresponding changing-over; It is characterized in that:
Also comprise pulse-width modulator PWM and triode monostable time delay circuit; The A contact at the two ends of described three fixed contacts and C contact are connected to the signal input part of described triode monostable time delay circuit respectively, and the output of described triode monostable time delay circuit is electrically connected with the soft start end of described pulse-width modulator PWM; The modulating pulse output of described pulse-width modulator PWM is electrically connected with the main circuit of electric welding machine to control the electric power output of main circuit through potential isolation and drive circuit.
2. the control circuit of three usefulness one electric welding machine functions conversion as claimed in claim 1, it is characterized in that: described triode monostable time delay circuit comprises the first triode Q1, the second triode Q2 and the 3rd triode Q3; The described first triode Q1 and the second triode Q2 are the NPN type, and described the 3rd triode Q3 is a positive-negative-positive; The C contact at the two ends of described three throw switches, three fixed contacts and A contact are connected to the base stage of the described first triode Q1 respectively through the first diode D1 and the second diode D2; The emitter of the first triode Q1 is connected to the base stage of the second triode Q2 through the 3rd capacitor C 3 and the 5th resistance R 5 and the 5th diode D5, the emitter of the first triode Q1 connects the positive pole of the 3rd capacitor C 3, and the negative electrode of the 5th diode connects the base stage of the second triode Q2; The base stage of the 3rd triode Q3 is connected with the emitter of the first triode Q1 through the 4th diode D4, the 5th resistance R 5 and the 3rd capacitor C 3; The emitter of this first triode Q1 is simultaneously through the 3rd resistance R 3 ground connection; The negative electrode of the 3rd diode D3 is connected the plus earth of the 3rd diode D3 with the anode of the 4th diode D4, the base stage of the 3rd triode Q3; The collector electrode of the second triode Q2 and the emitter of the 3rd triode Q3 are connected soft start end 8 pin of described pulse-width modulator PWM in the lump, and the collector electrode of the emitter of the second triode Q2 and the 3rd triode Q3 is ground connection respectively.
3. the control circuit of three usefulness one electric welding machine functions conversion as claimed in claim 2, it is characterized in that: described the 3rd capacitor C 3 is electrochemical capacitor 10 μ F/25V, described the 5th resistance R 5 is 20k Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010200566350U CN201601661U (en) | 2010-01-15 | 2010-01-15 | Three-in-one electric welder function conversion control circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010200566350U CN201601661U (en) | 2010-01-15 | 2010-01-15 | Three-in-one electric welder function conversion control circuit |
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| CN201601661U true CN201601661U (en) | 2010-10-06 |
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| CN2010200566350U Expired - Lifetime CN201601661U (en) | 2010-01-15 | 2010-01-15 | Three-in-one electric welder function conversion control circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105855664A (en) * | 2016-01-27 | 2016-08-17 | 上海广为焊接设备有限公司 | Lift arc ignition circuit of double-function inverter welding machine |
-
2010
- 2010-01-15 CN CN2010200566350U patent/CN201601661U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105855664A (en) * | 2016-01-27 | 2016-08-17 | 上海广为焊接设备有限公司 | Lift arc ignition circuit of double-function inverter welding machine |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20101006 |