CN203338173U - Welding machine protection circuit based on thermistor - Google Patents
Welding machine protection circuit based on thermistor Download PDFInfo
- Publication number
- CN203338173U CN203338173U CN2013204198987U CN201320419898U CN203338173U CN 203338173 U CN203338173 U CN 203338173U CN 2013204198987 U CN2013204198987 U CN 2013204198987U CN 201320419898 U CN201320419898 U CN 201320419898U CN 203338173 U CN203338173 U CN 203338173U
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- China
- Prior art keywords
- thermistor
- welding machine
- voltage
- circuit based
- input end
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- Expired - Fee Related
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Abstract
The utility model discloses a welding machine protection circuit based on a thermistor. The welding machine protection circuit based on the thermistor comprises a welding machine main control loop, wherein the thermistor is connected in the welding machine main control loop; the input end of the thermistor is connected with a power supply end VCC; the output voltage end of the thermistor is connected with the positive input end of a voltage comparer; the negative output end of the voltage comparer is connected with a reference voltage end; and a hysteresis comparison circuit is connected between the positive input end and the output end of the voltage comparer. According to the welding machine protection circuit based on the thermistor provided by the utility model, a temperature relay is replaced by the thermistor to detect and control a temperature in the welding machine main control loop, thus avoiding signal interference and misoperations, improving the accuracy of temperature change detection, and improving the reliability of circuit heat dissipation protection.
Description
Technical field
The utility model relates to a kind of welding machine holding circuit, relates in particular to a kind of welding machine holding circuit based on thermistor.
Background technology
In existing welding machine, it is all to control as on the IGBT heating radiator with temperature relay that major loop welding machine temperature protection is controlled, on output rectification heating radiator, or the temperature on main-transformer.Temperature relay is a kind of switching device, easily produces undesired signal during switch motion, is unfavorable for the inhibition of undesired signal, causes the reliability decrease of product, and the protection temperature of temperature relay and the recovery temperature error larger, be unfavorable for the accurate control of temperature.Therefore, be necessary to provide a kind of welding machine holding circuit based on thermistor.
The utility model content
Technical problem to be solved in the utility model is to provide a kind of welding machine holding circuit based on thermistor, can not produce signal and disturb and misoperation, the accuracy that the raising temperature variation detects the reliability that increases circuit protection.
The utility model is to solve the problems of the technologies described above the technical scheme adopted to be to provide a kind of welding machine holding circuit based on thermistor; comprise the welding machine main control loop; wherein; be connected with thermistor in described welding machine main control loop; the input end of described thermistor is connected with power end VCC; the output voltage terminal of described thermistor is connected with the electrode input end of voltage comparator; the cathode output end of described voltage comparator is connected with reference voltage terminal, between the electrode input end of described voltage comparator and output terminal, is connected with hysteresis comparator circuit.
The above-mentioned welding machine holding circuit based on thermistor, wherein, described hysteresis comparator circuit comprises resistance R 7 and the diode D1 be cascaded.
The above-mentioned welding machine holding circuit based on thermistor, wherein, the input end of described thermistor is by connecting the first pin end and the power end VCC of plug-in unit CN1, the end of electric capacity of voltage regulation C2 is connected, the output voltage terminal of described thermistor is connected with the other end of electric capacity of voltage regulation C2 by the second pin that connects plug-in unit CN1, the second pin of described connection plug-in unit CN1 is by divider resistance R2, the electrode input end of divider resistance R6 and voltage comparator is connected, described electric capacity of voltage regulation C2 and capacitor C 1 are in series, described capacitor C 1, divider resistance R2 and divider resistance R3 are connected to form filter circuit.
The utility model contrast prior art has following beneficial effect: the welding machine holding circuit based on thermistor that the utility model provides; by thermistor, replace temperature relay to detect the temperature of controlling in the welding machine main control loop; disturb and misoperation the accuracy that the raising temperature variation detects the reliability that increases the circuit heat radiation protection thereby can not produce signal.
The accompanying drawing explanation
Fig. 1 is the welding machine holding circuit structural representation of the utility model based on thermistor.
Embodiment
Below in conjunction with drawings and Examples, the utility model will be further described.
Fig. 1 is the welding machine holding circuit structural representation of the utility model based on thermistor.
Refer to Fig. 1; the welding machine holding circuit based on thermistor that the utility model provides comprises the welding machine main control loop; wherein; be connected with thermistor NTC in described welding machine main control loop; the input end of described thermistor NTC is connected with power end VCC; the output voltage terminal of described thermistor NTC is connected with the electrode input end of voltage comparator U1A; the cathode output end of described voltage comparator U1A and resistance R 4; the reference voltage terminal that R5 produces is connected, and between the electrode input end of described voltage comparator U1A and output terminal, is connected with hysteresis comparator circuit.Resistance R 4, R5 is reference resistance, i.e. precision resister, resistance R 4 is cascaded with R5 and is connected with power end VCC.Thermistor NTC can be connected with power end VCC, voltage comparator U1A by connecting plug-in unit CN1, the operating voltage of power end VCC can be selected 12V～15V DC voltage, power end VCC powers to thermistor NTC by an end that connects plug-in unit CN1, and the other end that connects plug-in unit CN1 is exported temperature variant voltage signal.
The welding machine holding circuit based on thermistor that the utility model provides, wherein, described hysteresis comparator circuit comprises resistance R 7 and the diode D1 be cascaded.The input end of described thermistor can be connected with the end of power end VCC, electric capacity of voltage regulation C2 by the first pin end that connects plug-in unit CN1, the output voltage terminal of described thermistor NTC is connected with the other end of electric capacity of voltage regulation C2 by the second pin that connects plug-in unit CN1, the second pin of described connection plug-in unit CN1 is connected with the electrode input end of voltage comparator U1A by divider resistance R2, divider resistance R6, described electric capacity of voltage regulation C2 and capacitor C 1 are in series, and described capacitor C 1, divider resistance R2 and divider resistance R3 are connected to form filter circuit.
The welding machine holding circuit based on thermistor that the utility model provides; thermistor NTC detects in the welding machine main control loop needs the temperature detected; when temperature variation, the NTC resistance changes; with resistance R 4; the reference voltage of R5 produces relatively; resistance R 7, diode D1 is hysteresis comparator circuit, prevents temperature beating in critical conditions.Because the NTC resistance only changes with temperature, there is no switching signal, can not produce undesired signal, and the accurate control of temperature is had to positive effect.
In sum; the welding machine holding circuit based on thermistor that the utility model provides; utilize thermistor NTC to replace temperature relay; and detect the temperature in the main control loop of control welding machine by voltage comparator U1A; NTC resistance difference when temperature is different, thus make the pressure value difference on control circuit, utilize comparator circuit and hysteresis circuitry to control; can not produce signal and disturb and misoperation, the accuracy that the raising temperature variation detects the reliability that increases the circuit heat radiation protection.
Although the utility model discloses as above with preferred embodiment; so it is not in order to limit the utility model; any those skilled in the art; within not breaking away from spirit and scope of the present utility model; when doing a little modification and perfect, therefore protection domain of the present utility model is worked as with being as the criterion that claims were defined.
Claims (3)
1. the welding machine holding circuit based on thermistor; comprise the welding machine main control loop; it is characterized in that; be connected with thermistor in described welding machine main control loop; the input end of described thermistor is connected with power end VCC; the output voltage terminal of described thermistor is connected with the electrode input end of voltage comparator, and the cathode output end of described voltage comparator is connected with reference voltage terminal, between the electrode input end of described voltage comparator and output terminal, is connected with hysteresis comparator circuit.
2. the welding machine holding circuit based on thermistor as claimed in claim 1, is characterized in that, described hysteresis comparator circuit comprises resistance R 7 and the diode D1 be cascaded.
3. the welding machine holding circuit based on thermistor as claimed in claim 1 or 2, it is characterized in that, the input end of described thermistor is by connecting the first pin end and the power end VCC of plug-in unit CN1, the end of electric capacity of voltage regulation C2 is connected, the output voltage terminal of described thermistor is connected with the other end of electric capacity of voltage regulation C2 by the second pin that connects plug-in unit CN1, the second pin of described connection plug-in unit CN1 is by divider resistance R2, the electrode input end of divider resistance R6 and voltage comparator is connected, described electric capacity of voltage regulation C2 and capacitor C 1 are in series, described capacitor C 1, divider resistance R2 and divider resistance R3 are connected to form filter circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013204198987U CN203338173U (en) | 2013-07-15 | 2013-07-15 | Welding machine protection circuit based on thermistor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013204198987U CN203338173U (en) | 2013-07-15 | 2013-07-15 | Welding machine protection circuit based on thermistor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203338173U true CN203338173U (en) | 2013-12-11 |
Family
ID=49706838
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2013204198987U Expired - Fee Related CN203338173U (en) | 2013-07-15 | 2013-07-15 | Welding machine protection circuit based on thermistor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203338173U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105302186A (en) * | 2014-06-23 | 2016-02-03 | 艾默生网络能源有限公司 | Power supply control device for equipment |
| CN110873040A (en) * | 2018-08-30 | 2020-03-10 | 安徽美芝制冷设备有限公司 | Protection circuit and system of variable frequency compressor and refrigerator |
| CN111059038A (en) * | 2018-10-16 | 2020-04-24 | 安徽美芝制冷设备有限公司 | Temperature protection device and method for compressor, compressor system and refrigeration equipment |
-
2013
- 2013-07-15 CN CN2013204198987U patent/CN203338173U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105302186A (en) * | 2014-06-23 | 2016-02-03 | 艾默生网络能源有限公司 | Power supply control device for equipment |
| CN110873040A (en) * | 2018-08-30 | 2020-03-10 | 安徽美芝制冷设备有限公司 | Protection circuit and system of variable frequency compressor and refrigerator |
| CN111059038A (en) * | 2018-10-16 | 2020-04-24 | 安徽美芝制冷设备有限公司 | Temperature protection device and method for compressor, compressor system and refrigeration equipment |
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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: 20131211 Termination date: 20190715 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |