CN203071553U - Temperature control protection circuit - Google Patents
Temperature control protection circuit Download PDFInfo
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- CN203071553U CN203071553U CN 201220741266 CN201220741266U CN203071553U CN 203071553 U CN203071553 U CN 203071553U CN 201220741266 CN201220741266 CN 201220741266 CN 201220741266 U CN201220741266 U CN 201220741266U CN 203071553 U CN203071553 U CN 203071553U
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Abstract
The utility model relates to a temperature control protection circuit, and particularly relates to a temperature control protection circuit used in an electric welding machine. The temperature control protection circuit comprises a PWM control chip, a resistor R2, a resistor R3 and a normally open temperature control switch K, wherein a pin 2 of the PWM control chip is a reference voltage output end, the pin 2 is connected to a pin 1 of the PWM control chip through the resistor R2, and the pin 1 is a chip selection end; and the pin 1 is grounded through the resistor R3. A DC power supply comprises a positive electrode and a negative electrode, wherein the positive electrode is connected with a light emitting diode LED2 used for prompting abnormity. An anode of the light emitting diode LED2 is connected with the positive electrode, and a cathode of the light emitting diode LED2 and the normally open temperature control switch K are connected to the negative electrode in series. When the temperature control protection circuit protects because the temperature of the electric welding machine gets too high, the light emitting diode prompts that the electric welding machine is abnormal; and meanwhile, optocoupler isolation is adopted, thereby effectively preventing external interference signals at the temperature control position and the like from coming into the PWM control chip, and ensuing the reliability and the stability of the circuit.
Description
Technical field
The utility model relates to the electrical control field, is specifically related to a kind of temperature control protective circuit for electric welding machine.
Background technology
The temperature control circuit of electric welding machine is the guarantee of electric welding machine safe operation, provides a kind of traditional temperature control guard method referring to accompanying drawing 1, specifically forms by often opening temperature control K, resistance R 2, resistance R 3, integrated 3846.Often opening temperature control K does not reach closed temperature in temperature and is in off-state always, 5V reference voltage of No. 2 pin output of integrated 3846 makes that integrated 3846 No. 1 pin has a voltage to have integrated 3846 operate as normal, for the back one-level provides square wave driving signal, guarantee the electric welding machine operate as normal.Reach the temperature control closed temperature in case often open the temperature of temperature control place; often open temperature control K and be in conducting state; thereby allow integrated 3846 No. 1 pin be in 0 current potential; integrated 3846 quit work; can not provide the driving signal for the back one-level; welding machine quits work, and reaches the not too high and effect damaged of Yin Wendu of protection welding machine.
No abnormal indication when the weak point of this technical scheme is that electric welding machine quits work, Ruo Changkai temperature control K is influenced by high-frequency signal can disturb integrated 3846 operate as normal.
The utility model content
The purpose of this utility model is to provide a kind of temperature control protective circuit, to solve the problems of the technologies described above.
The technical problem that the utility model solves can realize by the following technical solutions:
A kind of temperature control protective circuit, comprise that a pwm chip, a resistance R 2, a resistance R 3 and often open temperature detect switch (TDS) K, No. 2 pins of described pwm chip are reference voltage output end, described No. 2 pins are connected to No. 1 pin of described pwm chip by described resistance R 2, and described No. 1 pin is sheet choosing end; Described No. 1 pin is by described resistance R 3 ground connection; It is characterized in that:
Also comprise a direct current power supply, described DC power supply comprises a positive pole, a negative pole, the described anodal LED 2 for abnormal prompt that connects, the anode of described LED 2 is connected with described positive pole, and the negative electrode of described LED 2 and the described temperature detect switch (TDS) K that often opens are connected serially to described negative pole; A described end of often opening temperature detect switch (TDS) K connects described negative pole, and the described other end of often opening temperature detect switch (TDS) K connects No. 1 pin of described pwm chip.
The utility model ought often be opened temperature detect switch (TDS) K temperature sensor and reach the closed temperature value, often opens temperature detect switch (TDS) K and connects power cathode, and this moment, LED 2 had electric current to flow through, and LED 2 is lighted, as abnormal prompt.
The negative electrode of described LED 2 is connected with the described temperature detect switch (TDS) K that often opens by the resistance R 4 of connecting.4 metering functions of resistance R prevent that LED 2 from damaging because of overcurrent.
Described resistance R 4 and the described capacitor C 1 that is provided with a ground connection between the temperature detect switch (TDS) K of often opening.
Described LED 2 adopts yellow light-emitting diode.
Described positive pole passes through a resistance R 1, reaches LED 1 ground connection of connecting with described resistance R 1 that is used for the power supply indication, and the anode of described LED 1 is connected the minus earth of described LED 1 with described resistance R 1.During the circuit operate as normal, LED1 lights.
The voltage swing of described DC power supply is 15V.
Described pwm chip adopts integrated 3846 chips.
Also comprise a photoelectrical coupler U5, described photoelectrical coupler U5 comprises an input, an output, and described input connects described negative pole by the described temperature detect switch (TDS) K that often opens, and the two ends of described output are in parallel with described resistance R 3.
The utility model to prevent the influence of high-frequency signal, guarantees the working stability of pwm chip by a photoelectrical coupler U5 in parallel plays buffer action at the two ends of resistance R 3, thereby provides safeguard for the safe operation of electric welding machine.
The light emitting source of described input adopts a light-emitting diode, the plus earth of described light-emitting diode, and the negative electrode of described light-emitting diode is connected serially to described negative pole by anode, a resistance R 5 that connects a diode D1 successively with the described temperature detect switch (TDS) K that often opens.Being provided with diode D1 stops the interference peak voltage to be scurried into anti-tamper photoelectrical coupler U5.5 metering functions of resistance R prevent from damaging photoelectrical coupler U5 because of overcurrent.
The light-receiving device of described output adopts phototriode, the grounded emitter of described phototriode, and the collector electrode of described phototriode is connected to described No. 1 pin.
During the utility model circuit operate as normal, LED 1 is lighted as power supply indicator, often open temperature detect switch (TDS) K and cut off negative 15V power supply, LED 2 and photoelectrical coupler U5 do not work, the reference voltage of a positive 5V of No. 2 pin output of integrated 3846, through resistance R 2, the R3 dividing potential drop is given integrated 3846 No. 1 pin, guarantee integrated 3846 operate as normal, for the back one-level provides the driving signal.Reach the closed temperature value when often opening temperature detect switch (TDS) K temperature sensor, often open temperature detect switch (TDS) K and connect power cathode, this moment, LED 2 had electric current to flow through, and LED 2 is lighted, as abnormal prompt.Photoelectrical coupler U5 input is through resistance R 5 in addition, diode D1, often open temperature detect switch (TDS) K and form the loop, photoelectrical coupler U5 work, the phototriode conducting, integrated 3846 No. 1 pin voltage becomes 0.3V, according to integrated 3846 inner principles, when No. 1 pin voltage is lower than 0.5V, integrated 3846 quit work, and do not have the output of the signal of driving.Reach the protection electric welding machine not because of the overheated effect of damaging.
Beneficial effect: owing to adopt technique scheme, the utility model circuit is succinct, when the too high and protection of electric welding machine Yin Wendu, has light-emitting diode prompting staff electric welding machine to have unusually, and is very clear.Adopt light-coupled isolation simultaneously, effectively avoided scurrying into pwm chip because of external interference signals such as temperature controls place, guaranteed the reliability and stability of circuit.
Description of drawings
Fig. 1 is traditional temperature control protective circuit;
Fig. 2 is the utility model circuit connection diagram.
Embodiment
For technological means, creation characteristic that the utility model is realized, reach purpose with effect is easy to understand, below in conjunction with the further elaboration the utility model of concrete diagram.
With reference to Fig. 2, a kind of temperature control protective circuit comprises that a pwm chip, a resistance R 2, a resistance R 3 and often open temperature detect switch (TDS) K, and No. 2 pins of pwm chip are reference voltage output end, No. 2 pins are connected to No. 1 pin of pwm chip by resistance R 2, and No. 1 pin is sheet choosing end; No. 1 pin is by resistance R 3 ground connection; Also comprise a direct current power supply, DC power supply comprises a positive pole, a negative pole, the anodal LED 2 that is used for abnormal prompt that connects, the anode of LED 2 is connected with anodal, the negative electrode of LED 2 and often open temperature detect switch (TDS) K and be connected serially to negative pole.An end of often opening temperature detect switch (TDS) K connects negative pole, and the other end of often opening temperature detect switch (TDS) K connects No. 1 pin of pwm chip.The utility model ought often be opened temperature detect switch (TDS) K temperature sensor and reach the closed temperature value, often opens temperature detect switch (TDS) K and connects power cathode, and this moment, LED 2 had electric current to flow through, and LED 2 is lighted, as abnormal prompt.
The negative electrode of LED 2 by connect a resistance R 4 with often open temperature detect switch (TDS) K and be connected.4 metering functions of resistance R prevent that LED 2 from damaging because of overcurrent.LED 2 adopts yellow light-emitting diode.Resistance R 4 and often open the capacitor C 1 that is provided with a ground connection between the temperature detect switch (TDS) K.
Positive pole passes through a resistance R 1, reaches LED 1 ground connection of connecting with resistance R 1 that is used for the power supply indication, and the anode of LED 1 is connected with resistance R 1, the minus earth of LED 1.During the circuit operate as normal, LED1 lights.
The voltage swing of DC power supply is 15V.Pwm chip adopts integrated 3846 chips.
Also comprise a photoelectrical coupler U5, photoelectrical coupler U5 comprises an input, an output, and input connects negative pole by often opening temperature detect switch (TDS) K, and the two ends of output are in parallel with resistance R 3.
The utility model to prevent the influence of high-frequency signal, guarantees the working stability of pwm chip by a photoelectrical coupler U5 in parallel plays buffer action at the two ends of resistance R 3, thereby provides safeguard for the safe operation of electric welding machine.
The light emitting source of input adopts a light-emitting diode, the plus earth of light-emitting diode, the negative electrode of light-emitting diode by connecting a diode D1 successively anode, a resistance R 5 and often open temperature detect switch (TDS) K and be connected serially to negative pole.Being provided with diode D1 stops the interference peak voltage to be scurried into anti-tamper photoelectrical coupler U5.5 metering functions of resistance R prevent from damaging photoelectrical coupler U5 because of overcurrent.The light-receiving device of output adopts phototriode, the grounded emitter of phototriode, and the collector electrode of phototriode is connected to pin No. 1.
During the utility model circuit operate as normal, LED 1 is lighted as power supply indicator, often open temperature detect switch (TDS) K and cut off negative 15V power supply, LED 2 and photoelectrical coupler U5 do not work, the reference voltage of a positive 5V of No. 2 pin output of integrated 3846, through resistance R 2, the R3 dividing potential drop is given integrated 3846 No. 1 pin, guarantee integrated 3846 operate as normal, for the back one-level provides the driving signal.Reach the closed temperature value when often opening temperature detect switch (TDS) K temperature sensor, often open temperature detect switch (TDS) K and connect power cathode, this moment, LED 2 had electric current to flow through, and LED 2 is lighted, as abnormal prompt.Photoelectrical coupler U5 input is through resistance R 5 in addition, diode D1, often open temperature detect switch (TDS) K and form the loop, photoelectrical coupler U5 work, the phototriode conducting, integrated 3846 No. 1 pin voltage becomes 0.3V, according to integrated 3846 inner principles, when No. 1 pin voltage is lower than 0.5V, integrated 3846 quit work, and do not have the output of the signal of driving.Reach the protection electric welding machine not because of the overheated effect of damaging.
More than show and described basic principle of the present utility model and principal character and advantage of the present utility model.The technical staff of the industry should understand; the utility model is not restricted to the described embodiments; that describes in above-described embodiment and the specification just illustrates principle of the present utility model; under the prerequisite that does not break away from the utility model spirit and scope; the utility model also has various changes and modifications, and these changes and improvements all fall in claimed the utility model scope.The claimed scope of the utility model is defined by appending claims and equivalent thereof.
Claims (10)
1. temperature control protective circuit, comprise that a pwm chip, a resistance R 2, a resistance R 3 and often open temperature detect switch (TDS) K, No. 2 pins of described pwm chip are reference voltage output end, described No. 2 pins are connected to No. 1 pin of described pwm chip by described resistance R 2, and described No. 1 pin is sheet choosing end; Described No. 1 pin is by described resistance R 3 ground connection; It is characterized in that:
Also comprise a direct current power supply, described DC power supply comprises a positive pole, a negative pole, the described anodal LED 2 for abnormal prompt that connects, the anode of described LED 2 is connected with described positive pole, and the negative electrode of described LED 2 and the described temperature detect switch (TDS) K that often opens are connected serially to described negative pole;
A described end of often opening temperature detect switch (TDS) K connects described negative pole, and the described other end of often opening temperature detect switch (TDS) K connects No. 1 pin of described pwm chip.
2. a kind of temperature control protective circuit according to claim 1, it is characterized in that: the negative electrode of described LED 2 is connected with the described temperature detect switch (TDS) K that often opens by the resistance R 4 of connecting.
3. a kind of temperature control protective circuit according to claim 2 is characterized in that: described resistance R 4 and the described capacitor C 1 that is provided with a ground connection between the temperature detect switch (TDS) K of often opening.
4. a kind of temperature control protective circuit according to claim 3; it is characterized in that: described positive pole passes through a resistance R 1, reaches LED 1 ground connection of connecting with described resistance R 1 that is used for the power supply indication; the anode of described LED 1 is connected the minus earth of described LED 1 with described resistance R 1.
5. a kind of temperature control protective circuit according to claim 4; it is characterized in that: also comprise a photoelectrical coupler U5; described photoelectrical coupler U5 comprises an input, an output; described input connects described negative pole by the described temperature detect switch (TDS) K that often opens, and the two ends of described output are in parallel with described resistance R 3.
6. a kind of temperature control protective circuit according to claim 5; it is characterized in that: the light emitting source of described input adopts a light-emitting diode; the plus earth of described light-emitting diode, the negative electrode of described light-emitting diode is connected serially to described negative pole by anode, a resistance R 5 that connects a diode D1 successively with the described temperature detect switch (TDS) K that often opens.
7. a kind of temperature control protective circuit according to claim 6 is characterized in that: the light-receiving device of described output adopts phototriode, the grounded emitter of described phototriode, and the collector electrode of described phototriode is connected to described No. 1 pin.
8. a kind of temperature control protective circuit according to claim 1 is characterized in that: described LED 2 employing yellow light-emitting diodes.
9. according to any described a kind of temperature control protective circuit of claim 1 to 8, it is characterized in that: the voltage swing of described DC power supply is 15V.
10. a kind of temperature control protective circuit according to claim 1, it is characterized in that: described pwm chip adopts integrated 3846 chips.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220741266 CN203071553U (en) | 2012-12-28 | 2012-12-28 | Temperature control protection circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220741266 CN203071553U (en) | 2012-12-28 | 2012-12-28 | Temperature control protection circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203071553U true CN203071553U (en) | 2013-07-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220741266 Expired - Fee Related CN203071553U (en) | 2012-12-28 | 2012-12-28 | Temperature control protection circuit |
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| Country | Link |
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| CN (1) | CN203071553U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105050295A (en) * | 2015-08-28 | 2015-11-11 | 深圳市志和兴业电子有限公司 | Over-temperature protection circuit of light-emitting diode (LED) drive power supply |
-
2012
- 2012-12-28 CN CN 201220741266 patent/CN203071553U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105050295A (en) * | 2015-08-28 | 2015-11-11 | 深圳市志和兴业电子有限公司 | Over-temperature protection circuit of light-emitting diode (LED) drive power supply |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20130717 Termination date: 20211228 |
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| CF01 | Termination of patent right due to non-payment of annual fee |