CN203062056U - Over-voltage under-voltage detection-protection circuit of inverter welding machine - Google Patents
Over-voltage under-voltage detection-protection circuit of inverter welding machine Download PDFInfo
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- CN203062056U CN203062056U CN 201220755467 CN201220755467U CN203062056U CN 203062056 U CN203062056 U CN 203062056U CN 201220755467 CN201220755467 CN 201220755467 CN 201220755467 U CN201220755467 U CN 201220755467U CN 203062056 U CN203062056 U CN 203062056U
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Abstract
The utility model provides an over-voltage under-voltage detection-protection circuit of an inverter welding machine and belongs to the technical field of inverter welding machines. The problems that using places of an existing welding machine are not fixed, therefore the situation that supply voltage is within a normal working voltage range of the welding machine can not be ensured, and the welding machine is damaged due to the fact that network voltage is too high or too low are solved. The over-voltage under-voltage detection-protection circuit of the inverter welding machine comprises an input detection circuit, an under-voltage over-voltage decision circuit, an output driving circuit and a control switch. The input detection circuit is connected with a main power supply circuit of the welding machine and sequentially connected with the under-voltage over-voltage decision circuit, the output driving circuit and the control switch in series. The control switch is arranged on the main power supply circuit, and the control switch is soft switching. The over-voltage under-voltage detection-protection circuit of the inverter welding machine has the advantages of being capable of playing a role in over-voltage protection and under-voltage protection and meanwhile reducing impact on a one-time rectifier bridge and capacitance when the welding machine is started or the network voltage fluctuates, the failure rate is reduced, and service life of the welding machine is prolonged.
Description
Technical field
The utility model belongs to the inverter type welder technical field, relates to a kind of inverter type welder over-and under-voltage and detects holding circuit.
Background technology
Inversion and rectification are two opposite concepts, and rectification is that alternating current is transformed to galvanic process, and inversion then is the process of direct current being changed into alternating current, adopt the Arc Welding Power of inversion transformation technique to be called inverter type welder.
The course of work of inversion welding and cutting device, be to obtain a more level and smooth direct current after three-phase or single-phase 50Hz industrial frequency AC electric rectification, the filtering, the inverter circuit of being made up of IGBT or FET becomes this direct current in the alternating current of 15～100kHz, after the high frequency main transformer step-down, rectifying and wave-filtering obtains the output of direct current stably welding current (or the alternating current of required frequency is exported in inversion again) again.The control circuit of inversion welding and cutting device is made up of given circuit and drive circuit etc., by the feedback of voltage, current signal is handled, realize the complete machine closed-loop control, adopting the PWM pulse width modulator is the control core technology, thereby obtains constant-current characteristics and the excellent welding technological effect of quick pulsewidth modulation.
Because the field of employment of welding machine has not stationarity, the staff can't guarantee whether supply voltage is in the normal working voltage scope of welding machine, the thing of damaging welding machine because line voltage is too high or too low happens occasionally, and adopts specific purpose tool cumbersome to the words that line voltage detects before each welding.Though have in the prior art at welding machine and set up the over-and under-voltage defencive function; the hurtful problem of butt welding machine itself when being connected overtension or crossing on the low power supply to solve above-mentioned welding machine; but in the actual welding process; also have the fluctuation of extraneous line voltage or the generation of phase shortage situation; these situations also can be damaged welding equipment, and the over-and under-voltage defencive function of above-mentioned routine can not play the effect of normal protection.
Summary of the invention
The purpose of this utility model is at the existing the problems referred to above of conventional inversion welding machine; and a kind of over-and under-voltage protection of can playing has been proposed, can prevent the over-and under-voltage detection holding circuit that situations such as voltage pulsation or phase shortage impact and damage the inverter type welder circuit again.
The purpose of this utility model can realize by following technical proposal: a kind of inverter type welder over-and under-voltage detects holding circuit; it comprises input detecting circuit, under-voltage overvoltage decision circuit, output driving circuit and gauge tap; input detecting circuit is connected with the welding machine mains supply line and connects with under-voltage overvoltage decision circuit, output driving circuit and gauge tap successively; gauge tap is arranged on the mains supply line; it is characterized in that described gauge tap is soft switch.
Input detecting circuit detection of grid voltage when supply voltage is crossed when low or too high, can disconnect by driving gauge tap, prevents that welding machine from working under inappropriate voltage and causing damage.Adopt soft switch power supply mode, earlier to the slow charging of electric capacity, to the impact of rectifier bridge and electric capacity, improve electric capacity service life when reducing to start shooting.
Compared with prior art, this inverter type welder over-and under-voltage detects holding circuit can play overvoltage and under-voltage protection, can reduce simultaneously to start shooting or during voltage ripple of power network to the impact of rectifier bridge and electric capacity, reduce fault rate, improve the service life of electric capacity and welding machine.
Description of drawings
Fig. 1 is the circuit theory diagrams of inverter type welder.
The specific embodiment
Below be specific embodiment of the utility model and 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 shown in Figure 1; this inverter type welder over-and under-voltage detects holding circuit and comprises input detecting circuit, under-voltage overvoltage decision circuit, output driving circuit and gauge tap; input detecting circuit is connected with the welding machine mains supply line and connects with under-voltage overvoltage decision circuit, output driving circuit and gauge tap successively; gauge tap is soft switch, is arranged on the mains supply line.
China power supply is divided into the civilian electricity of 220V and the commercial power of 380V, and in the present embodiment, supply voltage is between 190V～240V the time, and welding machine can both operate as normal.Input detecting circuit detects supply voltage in real time, and change and judged by under-voltage overvoltage decision circuit, when virtual voltage is not in above-mentioned interval, output driving circuit does not have control signal output, soft switch is failure to actuate, and is in off-state, and machine is not powered, be in not open state, prevent when brownout, welding machine wrong on the 380V power supply or during voltage instability to the destructive damage of machine.Otherwise in the time of between detected virtual voltage is in for 190V～240V, output driving circuit output control signal is given soft switch, and soft switch work also is in closure state, and machine can normally start.
Claims (1)
1. an inverter type welder over-and under-voltage detects holding circuit; it comprises input detecting circuit, under-voltage overvoltage decision circuit, output driving circuit and gauge tap; input detecting circuit is connected with the welding machine mains supply line and connects with under-voltage overvoltage decision circuit, output driving circuit and gauge tap successively; gauge tap is arranged on the mains supply line; it is characterized in that described gauge tap is soft switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220755467 CN203062056U (en) | 2012-12-31 | 2012-12-31 | Over-voltage under-voltage detection-protection circuit of inverter welding machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220755467 CN203062056U (en) | 2012-12-31 | 2012-12-31 | Over-voltage under-voltage detection-protection circuit of inverter welding machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203062056U true CN203062056U (en) | 2013-07-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201220755467 Expired - Fee Related CN203062056U (en) | 2012-12-31 | 2012-12-31 | Over-voltage under-voltage detection-protection circuit of inverter welding machine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203062056U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105458460A (en) * | 2015-11-27 | 2016-04-06 | 深圳市瑞凌实业股份有限公司 | Digital inverter welding machine and power-on self-detection method thereof |
| CN110824323A (en) * | 2019-11-08 | 2020-02-21 | 陕西航空电气有限责任公司 | Aviation brushless DC generator rectifier tube fault detection device |
-
2012
- 2012-12-31 CN CN 201220755467 patent/CN203062056U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105458460A (en) * | 2015-11-27 | 2016-04-06 | 深圳市瑞凌实业股份有限公司 | Digital inverter welding machine and power-on self-detection method thereof |
| CN110824323A (en) * | 2019-11-08 | 2020-02-21 | 陕西航空电气有限责任公司 | Aviation brushless DC generator rectifier tube fault detection device |
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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 | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130717 Termination date: 20201231 |