CN100425383C - Overheat protection circuit for fan of electric welder - Google Patents

Overheat protection circuit for fan of electric welder Download PDF

Info

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
Authority
CN
China
Prior art keywords
pin
relay
winding
voltage
welding machine
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
Application number
CNB2005100307129A
Other languages
Chinese (zh)
Other versions
CN1954950A (en
Inventor
石硕
石惟一
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SHANGHAI DONGSHENG WELDING GROUP CO Ltd
Original Assignee
SHANGHAI DONGSHENG WELDING GROUP CO Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by SHANGHAI DONGSHENG WELDING GROUP CO Ltd filed Critical SHANGHAI DONGSHENG WELDING GROUP CO Ltd
Priority to CNB2005100307129A priority Critical patent/CN100425383C/en
Publication of CN1954950A publication Critical patent/CN1954950A/en
Application granted granted Critical
Publication of CN100425383C publication Critical patent/CN100425383C/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Protection Of Static Devices (AREA)
  • Fuses (AREA)

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

Blower fan overheating protection circuit in the electric welding machine
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).
CNB2005100307129A 2005-10-25 2005-10-25 Overheat protection circuit for fan of electric welder Expired - Fee Related CN100425383C (en)

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)

* Cited by examiner, † Cited by third party
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

Patent Citations (5)

* Cited by examiner, † Cited by third party
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

Similar Documents

Publication Publication Date Title
JP5776658B2 (en) Semiconductor drive device
JP4473927B2 (en) Short circuit protection device
JP2004135400A (en) Secondary battery with protective circuit
CN101720147B (en) LED driving circuit and LED device
CN105794065A (en) Robot control device and protective circuit
CN2827607Y (en) Protection circuit for superheat of fan in electric welder
KR20130065569A (en) Pulse width modulation controller
CN202435330U (en) Power module driving protection system of permanent magnet synchronous motor controller
CN100425383C (en) Overheat protection circuit for fan of electric welder
CN102723693A (en) Load protection circuit and method for electric tool
JP2013215039A (en) Power conversion device
CN203813418U (en) An over-current overvoltage protection circuit used for a thyristor switch power supply
CN102664125B (en) Double high driving level-resistant magnetic latching relay driving circuit
CN102208799A (en) Overheat protection circuit for intelligent power module and control method thereof
CN100490265C (en) Electric current driving electronic broken circuit protecting equipment
CN218387940U (en) Electric heating system with program fault protection function
AU2015101527A4 (en) A Starting Protection Circuit of Low-Voltage and High-Power Motor
CN218482775U (en) Explosion-proof protection system of high-power IGBT module
CN215990181U (en) Overcurrent protection circuit
CN115421533B (en) Electric heating temperature control system with double protection functions
CN102882183B (en) Output leakage protection device
CN210743551U (en) Drive voltage protection circuit and drive device
CN215343898U (en) Battery fuse protection circuit, battery pack and electric vehicle
CN213876391U (en) MOS drive protection feedback circuit
CN216851929U (en) High-voltage MOS tube driving circuit

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
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