CN209035669U - A kind of TIG weld isolated from power interface circuit - Google Patents
A kind of TIG weld isolated from power interface circuit Download PDFInfo
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- CN209035669U CN209035669U CN201821381308.5U CN201821381308U CN209035669U CN 209035669 U CN209035669 U CN 209035669U CN 201821381308 U CN201821381308 U CN 201821381308U CN 209035669 U CN209035669 U CN 209035669U
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- circuit
- tig weld
- isolated
- power interface
- power supply
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Abstract
The utility model discloses a kind of TIG weld isolated from power interface circuits; TIG weld isolated from power interface circuit includes High-tension Switch Devices; High-tension Switch Devices are made of multiple switching devices being serially connected; the packet routing device for carrying out overvoltage protection is parallel on each switching device; the side of High-tension Switch Devices is equipped with trigger control circuit, and the pulse transformer for playing buffer action is equipped between High-tension Switch Devices and trigger control circuit.The utility model increases a controlled on-off isolation circuit between TIG weld power supply and arc voltage measurement feed circuit.When TIG weld power supply, which is in, opens arcuation state, arc voltage measurement feed circuit is reliably isolated by the circuit of the utility model with TIG weld power supply.When TIG weld power supply is in striking success status, arc voltage measurement feed circuit is reliably connected by the circuit of the utility model with TIG weld power supply.
Description
Technical field
The utility model relates to a kind of TIG weld isolated from power interface circuits, belong to TIG weld power supply technology neck
Domain.(TIG, full name are tungsten inert gas, Chinese are as follows: tungsten inert gas；TIG weldering is that tungsten inert gas is protected
Shield weldering)
Background technique
In the automatic welder using TIG weld technique, need to measure the current value of feedback arc voltage, to realize electric arc
Voltage controls (AVC) and other control functions.TIG weld power supply opens arc mode and high-frequency and high-voltage is generally used to open arc, that is, is opening arc
When, the source of welding current can export the high-frequency and high-voltage of 2000-3000V, to puncture tungsten bar and workpiece the air gap, form electric arc.At this
In the case of kind, if having accessed arc voltage measurement feed circuit, it is on the one hand likely to result in striking failure, on the other hand meeting
Make arc voltage measurement feed circuit damage.
Summary of the invention
Technical problem to be solved by the utility model is: solving when TIG weld power supply opens arc using high-frequency and high-voltage, such as
What causes striking failure after preventing access arc voltage measurement feed circuit and makes arc voltage measurement feed circuit damage
Problem.
In order to solve the above-mentioned technical problem, there is provided a kind of TIG weld isolated from power for the technical solution of the utility model
Interface circuit, which is characterized in that be set between TIG weld power output end and arc voltage measurement feed circuit, the TIG
Source of welding current isolating interface circuit includes High-tension Switch Devices, and High-tension Switch Devices are by multiple switching device groups being serially connected
At, be parallel on each switching device carry out overvoltage protection packet routing device, the side of High-tension Switch Devices is set
There is trigger control circuit, the pulse transformer for playing buffer action is equipped between High-tension Switch Devices and trigger control circuit.
Preferably, each switching device includes a high-pressure thyristor being serially connected and a switch.
Preferably, the trigger control circuit includes oscillating circuit, and oscillating circuit is connect with triode, and triode passes through
Pulse transformer is connect with High-tension Switch Devices.
Preferably, the oscillating circuit is made of the resistance capacitance of 555 circuits and its periphery；One termination of 555 circuits
Ground, No. 2 feet and No. 6 feet on 555 circuits are connect with one end of one end of 3rd resistor and first capacitor, 7 on 555 circuits
The other end of number foot connection 3rd resistor and one end of second resistance, the other end of No. 8 feet connection second resistance on 555 circuits
With one end of the 4th resistance, No. 4 feet on 555 circuits connect the other end and control signal end of the 4th resistance, on 555 circuits
No. 5 feet connect one end of the second capacitor, and No. 3 feet on 555 circuits connect one end of the 5th resistance, the other end of the 5th resistance with
The base stage of triode connects, the other end of the emitter connection first capacitor of triode and the other end of the second capacitor, triode
Collector connect pulse transformer.
Preferably, the control signal of the control signal end is Uc, as Uc=0, oscillating circuit block failure of oscillation, and No. 3
Foot exports low level, triode cut-off, and pulse transformer is exported without trigger pulse；As Uc=1, oscillating circuit starts to vibrate, and 3
Number foot output pulse signal exports trigger pulse to High-tension Switch Devices through triode pulse transformer.
Preferably, when the TIG weld power supply, which is in, opens arcuation state, triggering arteries and veins is controlled by trigger control circuit
Punching, makes injectron be in off state, and TIG weld power supply is isolated with arc voltage measurement feed circuit；When described
When TIG weld power supply striking success, trigger pulse is controlled by trigger control circuit, keeps injectron in the conductive state,
The arc voltage of TIG weld power supply is connected to arc voltage measurement feed circuit.
Preferably, the switching device is divided into two groups, wherein one group of switching device is connected on positive circuit, another group is opened
Devices in series is closed in negative loop；The output end of the TIG weld isolated from power interface circuit is parallel with first resistor.
The utility model TIG weld power supply and arc voltage measurement feed circuit between increase a controlled on-off every
From circuit.When TIG weld power supply, which is in, opens arcuation state, arc voltage is reliably measured feedback electricity by the circuit of the utility model
Road is isolated with TIG weld power supply, not only ensure that arc voltage measures feed circuit from the infringement of high-frequency and high-voltage, but also provide
Sufficiently large impedance guarantees striking success.When TIG weld power supply is in striking success status, the circuit of the utility model can
Arc voltage measurement feed circuit is connected with TIG weld power supply by ground, arc voltage is defeated by the circuit of the utility model
Enter to arc voltage and measures feed circuit.
Detailed description of the invention
Fig. 1 is a kind of schematic diagram of TIG weld isolated from power interface circuit.
Specific embodiment
To be clearer and more comprehensible the utility model, hereby with preferred embodiment, and attached drawing is cooperated to be described in detail below.
The utility model is a kind of TIG weld isolated from power interface circuit, for surveying TIG weld power supply and arc voltage
It measures feed circuit isolation or connects, as shown in Figure 1, this is electrically connected to TIG weld power output end and arc voltage measurement is anti-
Between current feed circuit, when TIG weld opens arc, issues the high-frequency and high-voltage of 3000V or so, the circuit of the utility model is by arc voltage
Measurement feed circuit is isolated from it disconnection；After striking success, arc voltage is measured feed circuit by the circuit of the utility model
It is connected with it.
Isolation realizes that each switching device includes being serially connected using High-tension Switch Devices such as high-pressure thyristors with connection
One high-pressure thyristor and a switch；In order to make up the insufficient disadvantage of single switch device pressure resistance, High-tension Switch Devices are by 4
Switch is connected in series.In order to guarantee TIG striking high voltage will not switching device breakdown, on single switch device using transient state electricity
Suppression device is pressed to carry out overvoltage protection.
The side of High-tension Switch Devices is equipped with trigger control circuit, and High-tension Switch Devices and trigger control circuit use pulse
Transformer is isolated.
Trigger control circuit includes oscillating circuit, trigger pulse circuit is formed using oscillating circuit, after triode amplifies
High-tension Switch Devices are output to by pulse transformer, to control its on-off.
Oscillating circuit is made of the resistance capacitance of 555 circuits and its periphery；One end of 555 circuits is grounded, on 555 circuits
No. 2 feet and No. 6 feet are connect with one end of one end of 3rd resistor and first capacitor, and on 555 circuits No. 7 foot connects third electricity
The one of the other end of resistance and one end of second resistance, the other end of No. 8 feet connection second resistance on 555 circuits and the 4th resistance
It holds, No. 4 feet on 555 circuits connect the other end and control signal end of the 4th resistance, No. 5 feet connection second on 555 circuits
One end of capacitor, No. 3 feet on 555 circuits connect one end of the 5th resistance, the other end of the 5th resistance and the base stage of triode
Connection, the other end of the emitter connection first capacitor of triode and the other end of the second capacitor, the collector connection of triode
Pulse transformer.Wherein, triode V1 is NPN triode.The collector connection of triode is also connect with a diode.
When the circuit of the utility model is in isolation, input terminal can bear the high frequency voltage not less than 3000V and rush
It hits, and there is big input impedance, do not influence the foundation of TIG weld electric arc.When the circuit of the utility model is in the conductive state, tool
There is lesser conduction voltage drop, and can guarantee reliable conducting.
When TIG weld power supply, which is in, opens arcuation state, trigger pulse is controlled by trigger control circuit, makes injectron
In off state, TIG weld power supply is isolated with arc voltage measurement feed circuit；
When TIG weld power supply striking success, trigger pulse is controlled by trigger control circuit, is in injectron
The arc voltage of TIG weld power supply is connected to arc voltage measurement feed circuit by state.
The circuit devcie of the utility model installs the input of original signal and the output of processing result on a printed circuit
It is connected using electric terminal plate.
The utility model is used for the isolation and connection of TIG power supply, to realize arc voltage measurement and AVC control.
The design scheme principle of the utility model are as follows:
1, the first thyristor SCR1 and the second thyristor SCR2 is connected on positive circuit, and third thyristor SCR3 and the 4th is brilliant
Brake tube SCR4 is connected on negative loop, so that TIG weld power output end and arc voltage measurement feed circuit are completely isolated.
2, high frequency voltage value reaches 3000V when TIG power supply opens arc, and the highest pressure of general thyristor reaches 2000V.It considers
Pressure-resistant surplus uses 4 Thyristors in series to improve total pressure voltage to 8000V.
3, one group of Transient Voltage Suppressor series loop in parallel on each thyristor.The guarantor of each Transient Voltage Suppressor
Voltage is protected in 500V or so, the protection voltage for the protection circuit being connected in series by two Transient Voltage Suppressors is 1000V.These
Excess voltage protection, existing voltage protection effect, and have pressure effect.
4, output end parallel connection first resistor R1 provides conducting for thyristor SCR1-SCR4 and maintains electric current；Resistance R1 is set to
Between thyristor SCR2 and thyristor SCR3.
5, oscillating circuit is constituted by 555 circuits and peripheral resistance capacitance, trigger pulse is provided；Pulse signal is through triode V1
It is exported after amplification by pulse transformer T1 and T2, controls the conducting of thyristor SCR1-SCR4.Uc is control signal, works as Uc=0
When, oscillating circuit blocks failure of oscillation, and No. 3 feet export low level, triode V1 cut-off, and pulse transformer is exported without trigger pulse；When
When Uc=1, oscillating circuit starts to vibrate, No. 3 foot output pulse signals, exports triggering arteries and veins through triode V1 pulse transformer
It rushes to thyristor SCR1-SCR4 (i.e. High-tension Switch Devices).
Claims (7)
1. a kind of TIG weld isolated from power interface circuit, which is characterized in that be set to TIG weld power output end and arc voltage
Measure between feed circuit, the TIG weld isolated from power interface circuit includes High-tension Switch Devices, High-tension Switch Devices by
Multiple switching devices being serially connected form, and the Transient Voltage Suppressor for carrying out overvoltage protection is parallel on each switching device
The side of part, High-tension Switch Devices is equipped with trigger control circuit, is equipped with and plays between High-tension Switch Devices and trigger control circuit
The pulse transformer of buffer action.
2. a kind of TIG weld isolated from power interface circuit as described in claim 1, which is characterized in that each switch
Device includes a high-pressure thyristor being serially connected and a switch.
3. a kind of TIG weld isolated from power interface circuit as described in claim 1, which is characterized in that the triggering control
Circuit includes oscillating circuit, and oscillating circuit is connect with triode, and triode is connect by pulse transformer with High-tension Switch Devices.
4. a kind of TIG weld isolated from power interface circuit as claimed in claim 3, which is characterized in that the oscillating circuit
It is made of the resistance capacitance of 555 circuits and its periphery；One end of 555 circuits is grounded, No. 2 feet and No. 6 feet on 555 circuits with
One end of 3rd resistor is connected with one end of first capacitor, and on 555 circuits No. 7 foot connects the other end and second of 3rd resistor
One end of resistance, the other end of No. 8 feet connection second resistance on 555 circuits and one end of the 4th resistance, 4 on 555 circuits
Number foot connects the other end and control signal end of the 4th resistance, and No. 5 feet on 555 circuits connect one end of the second capacitor, 555 electricity
No. 3 feet of road connect one end of the 5th resistance, and the other end of the 5th resistance and the base stage of triode connect, the transmitting of triode
Pole connects the other end of first capacitor and the other end of the second capacitor, and the collector of triode connects pulse transformer.
5. a kind of TIG weld isolated from power interface circuit as claimed in claim 4, which is characterized in that the control signal
The control signal at end is Uc, and as Uc=0, oscillating circuit blocks failure of oscillation, and No. 3 feet export low level, triode cut-off, and pulse becomes
Depressor is exported without trigger pulse；As Uc=1, oscillating circuit starts to vibrate, and No. 3 foot output pulse signals drive through triode
Pulse transformer exports trigger pulse to High-tension Switch Devices.
6. a kind of TIG weld isolated from power interface circuit as described in claim 1, which is characterized in that when the TIG weld
Power supply controls trigger pulse by trigger control circuit, injectron is made to be in off state in when opening arcuation state, will
TIG weld power supply is isolated with arc voltage measurement feed circuit；When the TIG weld power supply striking success, pass through triggering
Control circuit controls trigger pulse, keeps injectron in the conductive state, the arc voltage of TIG weld power supply is connected to electricity
Arc voltage measures feed circuit.
7. a kind of TIG weld isolated from power interface circuit as described in claim 1, which is characterized in that the switching device
It is divided into two groups, wherein one group of switching device is connected on positive circuit, another group of switching device is connected on negative loop；Described
The output end of TIG weld isolated from power interface circuit is parallel with first resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821381308.5U CN209035669U (en) | 2018-08-27 | 2018-08-27 | A kind of TIG weld isolated from power interface circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821381308.5U CN209035669U (en) | 2018-08-27 | 2018-08-27 | A kind of TIG weld isolated from power interface circuit |
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| Publication Number | Publication Date |
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| CN209035669U true CN209035669U (en) | 2019-06-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201821381308.5U Active CN209035669U (en) | 2018-08-27 | 2018-08-27 | A kind of TIG weld isolated from power interface circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109079286A (en) * | 2018-08-27 | 2018-12-25 | 上海锅炉厂有限公司 | TIG weld isolated from power interface circuit |
-
2018
- 2018-08-27 CN CN201821381308.5U patent/CN209035669U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109079286A (en) * | 2018-08-27 | 2018-12-25 | 上海锅炉厂有限公司 | TIG weld isolated from power interface circuit |
| CN109079286B (en) * | 2018-08-27 | 2024-02-02 | 上海锅炉厂有限公司 | TIG welding power isolation interface circuit |
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