CN203992757U - A kind of overvoltage crowbar of electric welding machine - Google Patents
A kind of overvoltage crowbar of electric welding machine Download PDFInfo
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- CN203992757U CN203992757U CN201420338956.8U CN201420338956U CN203992757U CN 203992757 U CN203992757 U CN 203992757U CN 201420338956 U CN201420338956 U CN 201420338956U CN 203992757 U CN203992757 U CN 203992757U
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- resistance
- relay
- welding machine
- electric welding
- zener diode
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Abstract
The utility model provides a kind of overvoltage crowbar of electric welding machine, belongs to electric welding machine technical field.It has solved the bad problem of overvoltage crowbar stability of existing electric welding machine.The overvoltage crowbar of this electric welding machine comprises holding circuit and drive circuit, holding circuit comprises relay K 1 and the Zener diode Z4 being connected with extraneous power supply, field-discharge resistance RT11, field-discharge resistance RT13, the negative pole of diode Z1 is connected with the positive pole of light emitting diode UA1 by resistance R 11, the negative pole of light emitting diode UA1 is connected with the negative pole of Zener diode Z4, on light emitting diode UA1, be connected in parallel to capacitor C 11, the positive pole of Zener diode Z4 is connected with relay K 1 negative terminal by piezo-resistance RT12, holding circuit also comprises the drive circuit that can make relay J B1 disconnection or adhesive.The overvoltage crowbar of this electric welding machine has advantages of circuit simply and good stability.
Description
Technical field
The utility model belongs to electric welding machine technical field, relates to a kind of overvoltage crowbar of electric welding machine.
Background technology
The power input voltage of single-phase inversion electric welding machine is generally 220V left and right; but in the more severe countries and regions of some power grid qualities; voltage has often surpassed 220V; more than even reaching 300V; also likely can there is electric welding machine and when work, have the problem of wrong voltage; 220V voltage is received on 380V voltage; under this environment; if electric welding machine does not have overvoltage protection; that leakage that is just easy to occur electrochemical capacitor is even exploded; also may cause the damage of device for power switching, the general more complicated of current excess voltage protection.
Summary of the invention
The purpose of this utility model is to have the problems referred to above for existing technology, has proposed a kind of circuit simply and the overvoltage crowbar of the electric welding machine of good stability.
The purpose of this utility model can realize by following technical proposal: a kind of overvoltage crowbar of electric welding machine, comprise holding circuit and drive circuit, it is characterized in that: described holding circuit comprises relay K 1 and the Zener diode Z4 being connected with extraneous power supply, field-discharge resistance RT11, field-discharge resistance RT13, the negative pole of diode Z1 is connected with the positive pole of light emitting diode UA1 by resistance R 11, the negative pole of light emitting diode UA1 is connected with the negative pole of Zener diode Z4, on light emitting diode UA1, be connected in parallel to capacitor C 11, the positive pole of Zener diode Z4 is connected with relay K 1 negative terminal by piezo-resistance RT12, described field-discharge resistance RT11 and field-discharge resistance RT13 wherein separately one end after being connected, by piezo-resistance RT14, connect relay K 1 negative terminal, separately the other end connect relay K 1 anode and between be provided with relay J B1, described holding circuit also comprises the drive circuit that can make relay J B1 disconnection or adhesive.
In the overvoltage crowbar of above-mentioned a kind of electric welding machine, described drive circuit comprises FET Q4 and optocoupler U1B, the drain electrode of FET Q4 is connected with 24V positive source by relay J A1, the source electrode of FET Q4 is connected with 24V positive source by resistance R 2 after being connected with one end of optocoupler U1B, the grounded-grid of FET Q4 and and its source electrode between be connected with capacitor C 5 and Zener diode Z6, after being connected with the positive pole of Zener diode Z6, the negative pole of capacitor C 5 is connected with the grid of FET Q4, after being connected with the negative pole of Zener diode Z6, the positive pole of capacitor C 5 is connected with the source electrode of FET Q4.
Compared with prior art, its circuit structure of the overvoltage crowbar of this electric welding machine is simple, by current signal, is converted to optical signal, then optical signal is converted to current signal and controls and reach overvoltage protection effect, has improved its overvoltage protection degree of accuracy.
Accompanying drawing explanation
Fig. 1 is circuit diagram of the present utility model.
Fig. 2 is the circuit diagram of the utility model drive circuit.
The specific embodiment
Be below specific embodiment of the utility model by reference to the accompanying drawings, the technical solution of the utility model is further described, but the utility model be not limited to these embodiment.
As illustrated in fig. 1 and 2, the overvoltage crowbar of this electric welding machine comprises holding circuit and drive circuit, holding circuit comprises relay K 1 and the Zener diode Z4 being connected with extraneous power supply, field-discharge resistance RT11, field-discharge resistance RT13, the negative pole of described diode Z1 is connected with the positive pole of light emitting diode UA1 by resistance R 11, the negative pole of light emitting diode UA1 is connected with the negative pole of Zener diode Z4, on light emitting diode UA1, be connected in parallel to capacitor C 11, the positive pole of Zener diode Z4 is connected with relay K 1 negative terminal by piezo-resistance RT12, described field-discharge resistance RT11 and field-discharge resistance RT13 wherein separately one end after being connected, by piezo-resistance RT14, connect relay K 1 negative terminal, separately the other end connect relay K 1 anode and between be provided with relay J B1, described holding circuit also comprises the drive circuit that can make relay J B1 disconnection or adhesive.
Drive circuit comprises FET Q4 and optocoupler U1B, the drain electrode of FET Q4 is connected with 24V positive source by relay J A1, the source electrode of FET Q4 is connected with 24V positive source by resistance R 2 after being connected with one end of optocoupler U1B, the grounded-grid of FET Q4 and and its source electrode between be connected with capacitor C 5 and Zener diode Z6, after the negative pole of capacitor C 5 is connected with the positive pole of Zener diode Z6, be connected with the grid of FET Q4, after the positive pole of capacitor C 5 is connected with the negative pole of Zener diode Z6, be connected with the source electrode of FET Q4.
When because of misconnection high pressure (220VAC input is received to 380VAC power supply) or because other reasons high pressure adds fashionablely, high-tension current punctures piezo-resistance RT14 (piezo-resistance withstand voltage is set according to circuit requirement of withstand voltage) immediately, forms loop.High-tension current flows through between field-discharge resistance RT11 and piezo-resistance RT14, larger electric current is sharp field-discharge resistance RT11 and field-discharge resistance RT13(Thermosensor) temperature raise, and make the resistance of field-discharge resistance increase rapidly thereupon, and being equivalent to circuit to disconnect, resistance is infinitely great.And when voltage reaches certain value (setting value), diode Z1, resistance R 11, light emitting diode UA1, Zener diode Z4 and piezo-resistance RT12 form loop, high pressure punctures formation electric current piezo-resistance RT12 and Zener diode Z4, electric current makes light emitting diode UA1 luminous, make optocoupler U1B moved by light, the grid potential of FET Q4 is dragged down, Q4 cut-off, like this, relay J B1 just can not adhesive, high-tension current just can only pass through high voltage bearing RT11, RT14 loop and Z1, R11, UA1, the loop that Z4 and RT12 form, and can not damage circuit below, thereby protected circuit.And this protection is recoverable, reduced cost.Deng the normal rear field-discharge resistance temperature of voltage, fall, just can normally work again.Avoid the maintenance damaging because of overvoltage, improved operating efficiency.
If input voltage is normal, voltage is through RT11, RT13, rectifying and wave-filtering, input accessory power supply, makes accessory power supply work, output 24V direct current of voltage regulation, 24V direct current makes a pipe Q4 conducting, thereby make relay J A1 running, JB1 adhesive, short circuit RT11, RT13, the direct input rectifying bridge of supply voltage, circuit is normally worked.
Specific embodiment described herein is only to the explanation for example of the utility model spirit.The utility model person of ordinary skill in the field can make various modifications or supplements or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present utility model or surmount the defined scope of appended claims.
Claims (2)
1.
a kind of overvoltage crowbar of electric welding machine, comprise holding circuit and drive circuit, it is characterized in that: described holding circuit comprises relay K 1 and the Zener diode Z4 being connected with extraneous power supply, field-discharge resistance RT11, field-discharge resistance RT13, the negative pole of diode Z1 is connected with the positive pole of light emitting diode UA1 by resistance R 11, the negative pole of light emitting diode UA1 is connected with the negative pole of Zener diode Z4, on light emitting diode UA1, be connected in parallel to capacitor C 11, the positive pole of Zener diode Z4 is connected with relay K 1 negative terminal by piezo-resistance RT12, described field-discharge resistance RT11 and field-discharge resistance RT13 wherein separately one end after being connected, by piezo-resistance RT14, connect relay K 1 negative terminal, separately the other end connect relay K 1 anode and between be provided with relay J B1, described holding circuit also comprises the drive circuit that can make relay J B1 disconnection or adhesive.
2.
the overvoltage crowbar of a kind of electric welding machine according to claim 1, it is characterized in that, described drive circuit comprises FET Q4 and optocoupler U1B, the drain electrode of FET Q4 is connected with 24V positive source by relay J A1, the source electrode of FET Q4 is connected with 24V positive source by resistance R 2 after being connected with one end of optocoupler U1B, the grounded-grid of FET Q4 and and its source electrode between be connected with capacitor C 5 and Zener diode Z6, after being connected with the positive pole of Zener diode Z6, the negative pole of capacitor C 5 is connected with the grid of FET Q4, after being connected with the negative pole of Zener diode Z6, the positive pole of capacitor C 5 is connected with the source electrode of FET Q4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420338956.8U CN203992757U (en) | 2014-06-24 | 2014-06-24 | A kind of overvoltage crowbar of electric welding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420338956.8U CN203992757U (en) | 2014-06-24 | 2014-06-24 | A kind of overvoltage crowbar of electric welding machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203992757U true CN203992757U (en) | 2014-12-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420338956.8U Expired - Fee Related CN203992757U (en) | 2014-06-24 | 2014-06-24 | A kind of overvoltage crowbar of electric welding machine |
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| CN (1) | CN203992757U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111308160A (en) * | 2020-03-02 | 2020-06-19 | 深圳固邦科技有限公司 | Voltage detection circuit with self-locking function for electric welding machine |
| CN112975059A (en) * | 2021-04-27 | 2021-06-18 | 浙江世为电器科技有限公司 | Electric welding machine current reinforcing circuit |
-
2014
- 2014-06-24 CN CN201420338956.8U patent/CN203992757U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111308160A (en) * | 2020-03-02 | 2020-06-19 | 深圳固邦科技有限公司 | Voltage detection circuit with self-locking function for electric welding machine |
| CN112975059A (en) * | 2021-04-27 | 2021-06-18 | 浙江世为电器科技有限公司 | Electric welding machine current reinforcing circuit |
| CN112975059B (en) * | 2021-04-27 | 2022-12-30 | 浙江世为电器科技有限公司 | Electric welding machine current reinforcing circuit |
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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: 20141210 Termination date: 20150624 |
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| EXPY | Termination of patent right or utility model |