CN100425383C - Overheat protection circuit for fan of electric welder - Google Patents
Overheat protection circuit for fan of electric welder Download PDFInfo
- Publication number
- CN100425383C CN100425383C CNB2005100307129A CN200510030712A CN100425383C CN 100425383 C CN100425383 C CN 100425383C CN B2005100307129 A CNB2005100307129 A CN B2005100307129A CN 200510030712 A CN200510030712 A CN 200510030712A CN 100425383 C CN100425383 C CN 100425383C
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- pin
- relay
- winding
- voltage
- welding machine
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Abstract
An overheat protecting circuit for the fan in electric welder is composed of a winding and a capacitor, which are serially connected to electric power input, a thermosensitive element and a relay for sensing overheat and cutting off the welding current, and a welding current controller consisting of voltage stabilizing diode, three resistors, amplifier, comparator and transistor.
Description
Technical field
The present invention relates to a kind of electric welding machine, relate in particular to blower fan overheating protection circuit in this electric welding machine.
Background technology
As seen from Figure 1: existing cooling blower has some to have temperature protection circuit, and after the temperature of blower fan winding L raise, 2 work of blower fan temperature inside switch can be cut off the power supply (power supply generally is 380 input power supply) of blower fan, blower fan stall.This blower fan can not burn by the better protect blower fan, but can not protect electric welding machine; Because when the blower fan stall, electric welding machine but can not get protection because of the blower fan stall also in work.
Summary of the invention
The technical issues that need to address of the present invention have provided blower fan overheating protection circuit in a kind of electric welding machine, are intended to solve above-mentioned defective.
In order to solve the problems of the technologies described above, the present invention is achieved by the following technical solutions:
The present invention includes winding, electric capacity; Described winding and electric capacity are connected in series between the input both ends of power; Also comprise a relay, first contact, one end of described relay links to each other with an end of input power supply, and the other end is connected with an end of winding; A temperature-sensitive element; One end of described temperature-sensitive element is connected with the positive voltage of drawing from the electric welding machine control circuit, and the other end links to each other with the negative electrode of voltage-stabiliser tube, an end of the 3rd resistance; The other end ground connection of described the 3rd resistance; The anode of voltage-stabiliser tube is connected with 3 pin of amplifier; Between 2 pin of negative voltage of from the electric welding machine control circuit, drawing and amplifier, comprise one first resistance; The current control circuit of 1 pin of amplifier and 3 pin of comparator and electric welding machine also connects; 2 pin of comparator connect negative voltage, and 1 pin of comparator is received the base stage of triode by second resistance; The grounded emitter of triode, the colelctor electrode of triode connect an end of relay winding, another termination positive voltage of relay winding; One termination positive voltage of second contact of relay, the other end is received the welding machine shut-off circuit.
Compared with prior art, the invention has the beneficial effects as follows: owing to increased a temperature-sensitive element, after the temperature of blower fan winding raise, the signal of temperature-sensitive element output was also along with change, and temperature-sensitive element links to each other with the circuit of a control welding current; When temperature is too high, not only cut off welding current, also cut off the current supply circuit of blower fan simultaneously; When blower fan slightly transshipped, welding can not interrupted; And when blower fan seriously transshipped, welding circuit and blower fan current supply circuit turn-offed simultaneously, and both are all protected.
Description of drawings
Fig. 1 is the blower fan overheating protection circuit figure of prior art;
Fig. 2 is a circuit diagram of the present invention;
The specific embodiment
Below in conjunction with the accompanying drawing and the specific embodiment the present invention is described in further detail:
As seen from Figure 2: the present invention includes winding L, capacitor C; Described winding L and capacitor C are connected in series between the two ends at input power supply A, B; Also comprise a relay J, the first contact J1, one end of described relay J links to each other with an end A of input power supply, and the other end is connected with an end of winding L; A temperature-sensitive element Rt; The end of described temperature-sensitive element Rt is connected with the positive voltage U+ that draws from the electric welding machine control circuit, and the other end links to each other with the negative electrode of voltage-stabiliser tube DW, an end of the 3rd resistance R 3; The other end ground connection of described the 3rd resistance R 3; The anode of voltage-stabiliser tube DW is connected with 3 pin of amplifier I; Between 2 pin of negative voltage U one that from the electric welding machine control circuit, draws and amplifier I, comprise one first resistance R 1; The current control circuit 11 of 1 pin of amplifier I and 3 pin of comparator B and electric welding machine also connects; 2 pin of comparator B connect negative voltage U one, and 1 pin of comparator B is received the base stage of triode T by second resistance R 2; The grounded emitter of triode T, the colelctor electrode of triode T connect an end of relay J winding, another termination positive voltage U+ of relay J winding; The termination positive voltage U+ of the second contact J2 of relay, the other end is received welding machine shut-off circuit 12.
Operation principle of the present invention is as follows: when blower fan is operated in normal condition, relay J is failure to actuate, the first contact J1, the second contact J2 closure, input power supply A arrives B through the first contact J1, winding 1, capacitor C, the blower fan winding has, this moment, the resistance of Rt was bigger, and the E point voltage is lower, is not enough to puncture voltage-stabiliser tube DW; 1 pin of amplifier I output 0V, 1 pin of comparator B is also exported 0V, the relay J not adhesive of cutting off the power supply.
After temperature raise, the E point voltage surpassed the breakdown voltage of voltage-stabiliser tube DW, and 3 pin of amplifier I have voltage, and 1 pin of amplifier I has voltage, and strengthens along with the rising of temperature, and this voltage is delivered to the welding current control circuit, and this moment, 1 pin of comparator B was exported 0V.
After temperature continues to raise, the E point voltage further raises, the 1 pin voltage of amplifier I also raises, this moment comparator B 1 pin output HIGH voltage, triode T conducting, the relay J adhesive first contact J1, the second contact J2 all disconnect, and the first contact J1 cuts off the power supply circuits of blower fan, and the second contact J2 closes welding machine shut-off circuit 12; Like this, blower fan and electric welding machine all can not damage because of overheated.
Claims (1)
1. blower fan overheating protection circuit in the electric welding machine comprises winding (L), electric capacity (C); Described winding (L) and electric capacity (C) are connected in series between input power supply (A, B) two ends; It is characterized in that: also comprise a relay (J), first contact (J1) end of described relay (J) links to each other with an end (A) of input power supply, and the other end is connected with an end of winding (L); A temperature-sensitive element (Rt); One end of described temperature-sensitive element (Rt) is connected with the positive voltage of drawing from the electric welding machine control circuit (U+), and the other end links to each other with the negative electrode of voltage-stabiliser tube (DW), an end of the 3rd resistance (R3); The other end ground connection of described the 3rd resistance (R3); The anode of voltage-stabiliser tube (DW) is connected with 3 pin of amplifier (I); Between 2 pin of negative voltage of from the electric welding machine control circuit, drawing (U-) and amplifier (I), comprise one first resistance (R1); The current control circuit (11) of 3 pin of 1 pin of amplifier (I) and comparator (B) and electric welding machine also connects; 2 pin of comparator (B) connect negative voltage (U-), and 1 pin of comparator (B) is received the base stage of triode (T) by second resistance (R2); The grounded emitter of triode (T), the colelctor electrode of triode (T) connects an end of relay (J) winding, another termination positive voltage (U+) of relay (J) winding; One termination positive voltage (U+) of second contact (J2) of relay, the other end is received welding machine shut-off circuit (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100307129A CN100425383C (en) | 2005-10-25 | 2005-10-25 | Overheat protection circuit for fan of electric welder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2005100307129A CN100425383C (en) | 2005-10-25 | 2005-10-25 | Overheat protection circuit for fan of electric welder |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1954950A CN1954950A (en) | 2007-05-02 |
| CN100425383C true CN100425383C (en) | 2008-10-15 |
Family
ID=38062611
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2005100307129A Expired - Fee Related CN100425383C (en) | 2005-10-25 | 2005-10-25 | Overheat protection circuit for fan of electric welder |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100425383C (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2081596U (en) * | 1990-12-28 | 1991-07-24 | 李士华 | Electronic thermorelay |
| JP2000343221A (en) * | 1999-06-01 | 2000-12-12 | Keitai Go | Small-sized dc welding machine |
| CN2429946Y (en) * | 2000-06-13 | 2001-05-09 | 王继勋 | Overheated protector for electric appliances |
| CN2675317Y (en) * | 2004-02-07 | 2005-02-02 | 徐惠忠 | Main control circuit of electric welding machine |
| CN2827607Y (en) * | 2005-10-25 | 2006-10-18 | 上海东升焊接集团有限公司 | Protection circuit for superheat of fan in electric welder |
-
2005
- 2005-10-25 CN CNB2005100307129A patent/CN100425383C/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2081596U (en) * | 1990-12-28 | 1991-07-24 | 李士华 | Electronic thermorelay |
| JP2000343221A (en) * | 1999-06-01 | 2000-12-12 | Keitai Go | Small-sized dc welding machine |
| CN2429946Y (en) * | 2000-06-13 | 2001-05-09 | 王继勋 | Overheated protector for electric appliances |
| CN2675317Y (en) * | 2004-02-07 | 2005-02-02 | 徐惠忠 | Main control circuit of electric welding machine |
| CN2827607Y (en) * | 2005-10-25 | 2006-10-18 | 上海东升焊接集团有限公司 | Protection circuit for superheat of fan in electric welder |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1954950A (en) | 2007-05-02 |
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| 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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20081015 Termination date: 20191025 |