CN202726270U - Temperature protection circuit for control circuit of gas shielded welder - Google Patents
Temperature protection circuit for control circuit of gas shielded welder Download PDFInfo
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- CN202726270U CN202726270U CN 201220336119 CN201220336119U CN202726270U CN 202726270 U CN202726270 U CN 202726270U CN 201220336119 CN201220336119 CN 201220336119 CN 201220336119 U CN201220336119 U CN 201220336119U CN 202726270 U CN202726270 U CN 202726270U
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Abstract
The utility model relates to a temperature protection circuit for a control circuit of a gas shielded welder. The temperature protection circuit comprises a triode Q1, a triode Q5, a resistor R1, a resistor R2, a resistor R3, a resistor R6, a temperature control switch K1 and a light emitting diode LED2, wherein an emitter electrode of the triode Q5 is grounded, a collector electrode of the triode Q5 is connected with a positive electrode of a power supply through the light emitting diode LED2 and the resistor R6, a base electrode of the triode Q5 is connected with a base electrode of the triode Q1 and one end of the resistor R2 through the resistor R3, and grounded through a normally closed contact of the temperature control switch K1, a collector electrode of the triode Q1 is connected with the positive electrode of the power supply through the resistor R1, and the other end of the resistor R2 is connected with the positive electrode of the power supply. When temperature of a main transformer reaches an acting temperature of the temperature control switch K1, the temperature control switch K1 is off, the triode Q1 and the triode Q5 are completely on through the resistor R2 and the resistor R3, the collector electrodes of the triode Q1 and the triode Q5 become low level, even an operation switch K2 is pressed, the following lines do not work, and therefore, the protection circuit has a protection function.
Description
Technical field
The utility model relates to a kind of control circuit, is applicable to tapped gas-shielded welder, specifically, relates to a kind of gas-shielded welder control circuit temperature protection circuit, belongs to electronic technology field.
Background technology
At present, gas is protected weldering and is compared with manual electric arc welding, have the advantages such as welding quality is good, welding cost is low, welding surroundings improvement, development in recent years is very fast, has been widely used in the welding field of vehicle, boats and ships, electric power, building and other big machinery manufacturing enterprise.
Tapped gas-shielded welder generally comprises power circuit, temperature protection circuit, task driven circuit, working indicating, driving circuit for electromagnetic valve, power contactor drive circuit, wire-feed motor motor drive circuit and wire feeding motor power circuit; it is the important component part of gas-shielded welder that gas is protected the weldering power supply; detect, control the duty of gas-shielded welder, the quality of its performance directly affects the quality of welding.Existing gas-shielded welder wire feeding motor mainly is silicon controlled crystal brake pipe full-wave rectification formula mode of speed regulation, and the reverse-blocking tetrode thyristor frequency is generally 50HZ.Change the armature voltage that is added on the motor by the adjustment IGCT angle of flow and realize speed governing, this mode of speed regulation is simple and practical, but also there are some shortcomings: because there is not filter capacitor, that output voltage is pulsating dc voltage, and output voltage fluctuates with the fluctuation of line voltage, stability to wire feed rate has certain influence, and the flatness with regard to welding quality has certain influence with splashing like this.The large efficient of the noise of the wire feeding motor of this mode of speed regulation is low.Besides this speed regulating control circuit does not have electronics current limliting circuit; only be used as power protection by a fuse; in case the load of output wire feeding motor is uprushed or output short-circuit like this; just easily the speed governing circuit is burnt when fuse has little time to work sometimes or fuse lost efficacy, this situation happens occasionally.
Traditional temperature protection circuit generally adopts temperature protection switch, when temperature protection switch breaks down, can cause temperature protection switch not have protective effect, affects use and the safety of gas welding machine.
The control line of general gas shielded arc welding and wire-feed motor power line all concentrate in together, and inevitably understand sometimes partial short-circuit like this in permanent use procedure, in case two common these circuit short circuits of guarantor's weldering are easy to cause burning of control panel.
Existing gas is protected the various indicator lamps of weldering and adjusted potentiometer all is on the front panel that disperses to install, and will certainly increase a lot of lines like this, and the high fault rate of cost is also high.
The utility model content
The technical problems to be solved in the utility model is for above deficiency; a kind of gas-shielded welder control circuit temperature protection circuit is provided; overcome when temperature protection switch breaks down in the prior art; can cause temperature protection switch not have protective effect; affect the use of gas welding machine and the defective of safety; after adopting this control circuit with temperature protection circuit; when the main transformer temperature overheating reaches the operating temperature of temperature detect switch (TDS); even this moment, operating switch was pressed; the circuit of back can not worked yet, thereby plays a protective role.
For solving above technical problem, the utility model is by the following technical solutions: a kind of gas-shielded welder control circuit temperature protection circuit is characterized in that: described temperature protection circuit comprises triode Q1, triode Q5, resistance R 1, resistance R 2, resistance R 3, resistance R 6, temperature detect switch (TDS) K1 and Light-Emitting Diode LED2;
The grounded emitter of triode Q5, the colelctor electrode of triode Q5 connects positive source through Light-Emitting Diode LED2, resistance R 6, the base stage of triode Q5 connect through resistance R 3 triode Q1 base stage, resistance R 2 an end and through the normally-closed contact ground connection of temperature detect switch (TDS) K1, the colelctor electrode of triode Q1 connects positive source through resistance R 1, another termination positive source of resistance R 2.
After the utility model adopts above technical scheme; compared with prior art; have the following advantages: owing to adopt described temperature protection circuit; when the main transformer temperature overheating reached the operating temperature of temperature detect switch (TDS) K1, temperature detect switch (TDS) K1 disconnected, by resistance R 2 and resistance R 3 so that triode Q1, the complete conducting of triode Q5; the colelctor electrode of triode Q1, triode Q5 becomes low level; even this moment, operating switch K2 pressed, the circuit of back can not worked yet, thereby plays a protective role.
Below in conjunction with drawings and Examples the utility model is elaborated.
Description of drawings
Accompanying drawing 1 is the circuit diagram of control circuit among the utility model embodiment;
Among the figure,
The 1-power circuit, 2-temperature protection circuit, 3-task driven circuit, 4-working indicating, 5-driving circuit for electromagnetic valve, 6-power contactor drive circuit, 7-wire-feed motor motor drive circuit, 8-wire feeding motor power circuit.
The specific embodiment
Embodiment, as shown in Figure 1, a kind of gas-shielded welder control circuit temperature protection circuit, control circuit comprise power circuit 1, temperature protection circuit 2, task driven circuit 3, working indicating 4, driving circuit for electromagnetic valve 5, power contactor drive circuit 6, wire-feed motor motor drive circuit 7 and the wire feeding motor power circuit 8 of electrical connection;
Power circuit 1 comprises diode D1, diode D2, diode D3, diode D4, capacitor C 1, capacitor C 2, capacitor C 3, integrated package of pressure-stabilizing IC1, resistance R 16 and Light-Emitting Diode LED6,14 volts of alternating currents are the diode D1 of 1N4007 through model, diode D2, diode D3, diode D4 bridge rectifier, again by capacitor C 2, capacitor C 3 filtering obtain the DC voltage of 17V to about the 20V, then be that 7812 integrated package of pressure-stabilizing IC1 voltage stabilizing obtains stable 12V DC voltage through model, supplying with other circuit uses, guarantee that whole line work is not subjected to the impact of voltage pulsation, Light-Emitting Diode LED1 and resistance R 16 are power supply indication circuits.
Temperature detect switch (TDS) K1 is temperature protection switch, normally-closed contact under normal circumstances, and the base stage of triode closed Q5, triode Q1 is low level; triode Q5, triode Q1 do not work; Light-Emitting Diode LED2 does not work, and the current collection of triode Q1 is high level very, and K2 provides working power for operating switch.When the main transformer temperature overheating of carbon-dioxide arc welding reaches the operating temperature of temperature detect switch (TDS) K1; temperature detect switch (TDS) K1 disconnects; by resistance R 2 and resistance R 3 so that triode Q1, the complete conducting of triode Q5; the colelctor electrode of triode Q1, triode Q5 becomes low level; even this moment, operating switch K2 pressed, the circuit of back can not worked yet, thereby plays a protective role; this moment, Light-Emitting Diode LED2 was bright, until temperature detect switch (TDS) K1 recovers normal.
Task driven circuit 3, comprise triode Q2, triode Q3, resistance R 5, capacitor C 6, capacitor C 7, capacitor C 10, resistance R 7, resistance R 8, resistance R 9, resistance R 11, potentiometer RW2, capacitor C 8, operating switch K2, time switch K3 and time base circuit IC2, the colelctor electrode of the termination triode Q1 of operating switch K2, the other end of operating switch K2 connects the base stage of triode Q2 through resistance R 5, one end of capacitor C 6, one end of resistance R 9, capacitor C 6, the other end ground connection of resistance R 9, the grounded emitter of triode Q2, the colelctor electrode of triode Q2 connects the base stage of triode Q3 through resistance R 7, one end of resistance R 8, the other end of resistance R 8, the colelctor electrode of triode Q3 connects the output cathode of power circuit 1, the emitter stage of triode Q3 is through the end of capacitor C 8 ground connection and connecting resistance R11,4 pin of time base circuit IC2 and 8 pin, the other end of resistance R 11 connects the end of time switch K3 through potentiometer RW2, one end of capacitor C 10,2 pin of time base circuit IC2 and 6 pin, the other end of time switch K3, the other end ground connection of capacitor C 10, the 1 pin ground connection of time base circuit IC2, the 5 foot meridian capacitor C7 ground connection of time base circuit IC2,3 pin of time base circuit IC2 connect working indicating 4, driving circuit for electromagnetic valve 5, power contactor drive circuit 6 and wire-feed motor motor drive circuit 7.
Time base circuit IC2 model is 555 time base circuit, when operating switch K2 presses, drive the base stage of triode Q2 by resistance R 1, resistance R 5, the triode Q2 conducting of working, thereby make triode Q3 conducting provide working power for time base circuit, time switch K3, when time switch K3 is closed, the time base timing function close.When time switch K3 was not closed, operating switch K2 pressed, triode Q3 conducting, and time base circuit IC2 gets electric its 3 pin output high level, and electric current charges to capacitor C 10 by resistance R 11 and potentiometer RW2 simultaneously, and potentiometer RW2 is that timing is adjusted potentiometer.At that time 2 of basic IC circuit 2 and the voltage of 6 pin when being charged to 2/3 time base circuit IC2 supply voltage output pin 3 become low level, do not quit work even operating switch K2 this moment disconnects output yet.
When time switch K3 was closed, timing function was closed, as long as press operating switch K2 this moment, 3 pin of time base circuit IC2 are just exported high level.
Working indicating 4, comprise triode Q6, resistance R 17, capacitor C 12 and Light-Emitting Diode LED4,3 pin of one termination time base circuit IC2 of resistance R 17, one end of another termination capacitor C 12 of resistance R 17, the base stage of triode Q6, the grounded emitter of the other end of capacitor C 12, triode Q6, the colelctor electrode of triode Q6 connect the output cathode of power circuit 1 through Light-Emitting Diode LED4; Light-Emitting Diode LED4 lamp is bright during at that time 3 pin of basic IC circuit 2 output high level.
Driving circuit for electromagnetic valve 5, comprise diode D5, diode D6, triode Q10, resistance R 18, capacitor C 17 and relay J D1, resistance R 18 and capacitor C 17 are relay delay releasing circuits, the positive pole of diode D6 connects 3 pin of time base circuit IC2, the negative pole of diode D6 connects an end of capacitor C 17, one end of resistance R 18, the other end ground connection of capacitor C 17, the base stage of another termination triode Q10 of resistance R 18, the grounded emitter of triode Q10, the colelctor electrode of triode Q10 connects the output cathode of power circuit 1 through the coil of relay J D1, the coil of relay J D1 is in parallel with diode D5, connected electromagnetic valve between the normally opened contact of relay J D1.
Power contactor drive circuit 6, comprise diode D10, diode D11, triode Q11, resistance R 26, capacitor C 18 and relay J D2, resistance R 26 and capacitor C 18 are relay delay releasing circuits, the positive pole of diode D11 connects 3 pin of time base circuit IC2, the negative pole of diode D11 connects an end of capacitor C 18, one end of resistance R 26, the other end ground connection of capacitor C 18, the base stage of another termination triode Q11 of resistance R 26, the grounded emitter of triode Q11, the colelctor electrode of triode Q11 connects the output cathode of power circuit 1 through the coil of relay J D2, the coil of relay J D2 is in parallel with diode D10, connects contactor between the normally opened contact of relay J D2.
Wire-feed motor motor drive circuit 7, comprise diode D7, triode Q7, resistance R 13, resistance R 20, capacitor C 16, capacitor C 19 and relay J D3, resistance R 13 and capacitor C 19 are relay J D3 deferred action circuit, 3 pin of one termination time base circuit IC2 of resistance R 13, one end of another termination capacitor C 19 of resistance R 13, one end of resistance R 20, the other end of resistance R 20 is through capacitor C 16 ground connection and connect the base stage of triode Q7, capacitor C 19, the grounded emitter of the other end of capacitor C 16 and triode Q7, the colelctor electrode of triode Q7 connects the output cathode of power circuit 1 through the coil of relay J D3, and the coil of relay J D3 is in parallel with diode D7.
Control circuit job description: when operating switch K2 presses, time base circuit IC2 gets electric, its 3 pin output high level, Light-Emitting Diode LED4 lamp is bright, gives rapidly capacitor C 17 by diode D6, and capacitor C 17 charges electricity and drives triode Q10 conducting, triode Q10 drives relay J D1 action, charge electricity for rapidly capacitor C 18, capacitor C 18 by diode D11 and drive triode Q11 conducting, triode Q11 drives the JD2 action, and the course of work is time-delay not; And capacitor C 19 has an of short duration time-delay by resistance R 13 charging, so relay J D3 will lag behind the action of relay J D1, relay J D2, thereby realizes supplying gas first, sending behind the electricity the again process of wire feed welding; And when stopping because capacitor C 17, capacitor C 18, capacitor C 19 to wait and discharge after relay just discharge, by selecting suitable electric capacity and resistance value to make the delay time of relay J D1 greater than the delay time of JD2, resistance R 20 values are smaller, electricity on the capacitor C 19 is by resistance R 13 and resistance R 20 simultaneously repid discharges simultaneously, the delay time of relay J D3 can be ignored, stop first wire feed when so just having realized stopping, stopping sending electricity again, time-delay stops to supply gas after more than 1 second again.
Wire feeding motor power circuit 8 comprises translation circuit IC3, bridge rectifier block DB1, capacitor C 12, capacitor C 13, capacitor C 14, resistance R 21, resistance R 22, current-limiting resistance R23, resistance R 24, resistance R 27, potentiometer RW1, diode D8, diode D9, triode Q8 and inductance magnet ring L, capacitor C 12 is connected between the positive pole and ground of bridge rectifier block DB1,1 pin of translation circuit IC3 connects 8 pin of translation circuit IC3, the end of current-limiting resistance R23 and the colelctor electrode of triode Q8,6 pin of another termination translation circuit IC3 of current-limiting resistance R23, the positive pole of bridge rectifier block DB1, the base stage of triode Q8 connects 2 pin of translation circuit IC3, one end of resistance R 27,4 pin of another termination translation circuit IC3 of resistance R 27, the 3 foot meridian capacitor C13 of translation circuit IC3 connect 4 pin of translation circuit IC3,8 pin of translation circuit IC3 are connected with 7 pin of translation circuit IC3, the 4 pin ground connection of translation circuit IC3, the emitter stage of triode Q8 connects the negative pole of diode D8, the end of inductance magnet ring L, the positive pole of diode D8 connects 4 pin of translation circuit IC3, the other end of inductance magnet ring L connects 4 pin of translation circuit IC3 through capacitor C 14, the 5 pin connecting resistance R21 of translation circuit IC3, one end of resistance R 22, the other end of resistance R 21 connects the other end of inductance magnet ring L through potentiometer RW1, the negative pole of another termination bridge rectifier block DB1 of resistance R 22, relay J D3 often opens the other end that stationary contact meets inductance magnet ring L, the normally closed stationary contact of relay J D3 is through resistance R 24 ground connection, the movable contact of relay J D3 connects the negative pole of diode D9, the plus earth of diode D9, the two ends of diode D9 wire feeding motor in parallel.
The pin explanation of translation circuit IC3: 1 pin is switch transistor T 1 collector terminal; 2 pin are switch transistor T 1 emitter stage exit; 3 pin are timing capacitor ct terminals, regulate ct operating frequency is changed in 100-100kHz scope; 4 pin are power supply ground; 5 pin are the voltage comparator inverting input, also are simultaneously output voltage sampling ends; 6 pin are power end; 7 pin are load peak electric current (Ipk) sampling end; 8 pin are driving tube T2 collector terminal.
Translation circuit IC3 is that model is 34063 direct current DC-DC translation circuit, belongs to high frequency PMW DC voltage-stabilizing circuit, and capacitor C 13 is concussion electric capacity.The 24V alternating current obtains the direct current of the not voltage stabilizing about 30V by bridge rectifier block DB1 rectification, capacitor C 12 filtering.Resistance R 23 is current-limiting resistance, select the resistance of suitable current-limiting resistance R23 can set easily the maximum operating currenbt of wire-feed motor, when preventing stall because of overload motor damage and relevant components and parts, current-limiting resistance R23 plays the current-limiting protection effect, 7 pin of translation circuit IC3 are load peak electric current (IpK) sampling end, when certain reason causes output overloading, when surpassing the setting current value by current-limiting resistance R23 electric current, when the pressure drop that produces at 7 pin of translation circuit IC3 and 6 pin surpasses 300mV, translation circuit IC3 changes the dutycycle of output waveform automatically, output voltage is reduced, output current is no more than the operating current of setting, when output short-circuit, by the instantaneous setting electric current that reaches of the electric current of current-limiting resistance R23, and the feed back input terminal voltage is almost nil, and this moment, translation circuit IC3 can quit work, thereby the protection power tube is unlikely to burn; Inductance magnet ring L is energy storage inductor, and capacitor C 14 is output filter capacitor.Triode Q8 is high-power output triode.Potentiometer RW1 is that output voltage is adjusted potentiometer, adjusts RW1 and can change wire-feed motor speed, and resistance R 22 and resistance R 21, potentiometer RW1 form voltage stabilizing sampling circuit, and 5 pin of translation circuit IC3 are benchmark sampling ends, and 5 pin voltages are 1.25V.As can be seen from the figure:
1.25/R22=(V2-1.25)/(R21+RW1)；V2=1.25(R21+R22+RW1)/R22。
From formula, find out: output voltage and input voltage do not have an absolute relation, only relevant with resistance R 22 and resistance R 21, potentiometer RW1.Can not affect the operating voltage of wire-feed motor during mains fluctuations like this, thereby obtain stable wire feed rate, make wire feed more stable than traditional use silicon controlled crystal brake pipe speed governing.
Resistance R 24 is brake resistance, and purpose is for wire feeding motor is stopped rapidly.When stopping, resistance R 24 is serially connected in the armature two ends and forms closed loop circuit, can not shut down because of inertia during the direct current generator outage at once, the machine operation of this moment is at generating state, the electric energy of this moment mainly consumes by resistance R 24, electric current by resistance R 24 produces plugging power in armature, the electric current the when electric current in the armature is with normal operation at this moment is reverse, thereby motor is shut down rapidly.
Those skilled in the art will recognize that; the above-mentioned specific embodiment is exemplary; in order to make those skilled in the art can better understand the utility model content; should not be understood as the restriction to the utility model protection domain; remaining circuit also can adopt other different circuit; as long as realize its function, so long as the improvement of doing according to technical solutions of the utility model all falls into protection domain of the present utility model.
Claims (1)
1. gas-shielded welder control circuit temperature protection circuit, it is characterized in that: described temperature protection circuit (2) comprises triode Q1, triode Q5, resistance R 1, resistance R 2, resistance R 3, resistance R 6, temperature detect switch (TDS) K1 and Light-Emitting Diode LED2;
The grounded emitter of triode Q5, the colelctor electrode of triode Q5 connects positive source through Light-Emitting Diode LED2, resistance R 6, the base stage of triode Q5 connect through resistance R 3 triode Q1 base stage, resistance R 2 an end and through the normally-closed contact ground connection of temperature detect switch (TDS) K1, the colelctor electrode of triode Q1 connects positive source through resistance R 1, another termination positive source of resistance R 2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220336119 CN202726270U (en) | 2012-07-12 | 2012-07-12 | Temperature protection circuit for control circuit of gas shielded welder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220336119 CN202726270U (en) | 2012-07-12 | 2012-07-12 | Temperature protection circuit for control circuit of gas shielded welder |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202726270U true CN202726270U (en) | 2013-02-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220336119 Expired - Fee Related CN202726270U (en) | 2012-07-12 | 2012-07-12 | Temperature protection circuit for control circuit of gas shielded welder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202726270U (en) |
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2012
- 2012-07-12 CN CN 201220336119 patent/CN202726270U/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130213 Termination date: 20150712 |
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| EXPY | Termination of patent right or utility model |