US2021051775A1PendingUtilityA1
Power supply for electric arc gas heater
Est. expiryOct 1, 2034(~8.2 yrs left)· nominal 20-yr term from priority
H05H 1/36H05B 7/185H05B 7/144B23K 9/073
58
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Claims
Abstract
Such a design ensures the stability of the current control loop, while also ensuring a sufficient amount of current ripple to spread out the erosion zone on the electrodes of the torch.
Claims
exact text as granted — not AI-modified1 . A switching converter for driving an electrode of a welding device, the switching converter comprising:
a pulse-width modulated chopper configured to operate at a switching frequency f s ; and a ballast inductor coupled to the pulse-width modulated chopper and configured to be coupled with the electrode, wherein:
the switching converter is configured to have a current control loop latency τ and an input voltage potential U 0 ; and
the ballast inductor has an inductance between
(
U
0
1
5
0
0
)
τ
and
1
f
s
(
U
0
2
0
0
)
.
2 . The switching converter of claim 1 , wherein the inductance has a minimum value to maintain a loop stability criterion under operation.
3 . The switching converter of claim 2 , wherein the inductance has a maximum value to produce a peak to peak current ripple to enhance wandering of electric arc roots on the electrode under operation.
4 . The switching converter of claim 1 , wherein the switching converter is a DC to DC buck converter.
5 . The switching converter of claim 1 , wherein U 0 >3000 volts.
6 . The switching converter of claim 1 , wherein the switching converter is configured to provide between 1 and 10 MW.
7 . The switching converter of claim 1 , wherein the welding device is a non-transferred electric arc gas heater is a non-transferred segmented plasma torch.
8 . The switching converter of claim 1 , wherein the electrode is a hollow electrode.
9 . The switching converter of claim 1 , wherein the switching converter is configured to produce a peak to peak current ripple of at least 50 amps over a duty cycle range of the pulse-width modulated chopper.
10 . The switching converter of claim 9 , wherein the duty cycle range is at least 20% to 80%.
11 . A method of operating a welding device having a switching converter coupled with an electrode, the method comprising:
providing a voltage potential U 0 to an input of the switching converter; and providing a current from an output of the switching converter to the electrode, wherein the switching converter comprises:
a pulse-width modulated chopper configured to operate at a switching frequency f s ; and
a ballast inductor coupled to the pulse-width modulated chopper and configured to be coupled with the electrode, wherein:
the switching converter is configured to have a current control loop latency τ and an input voltage potential U 0 ; and
the ballast inductor has an inductance between
(
U
0
1
5
0
0
)
τ
and
1
f
s
(
U
0
2
0
0
)
.
12 . The method of claim 11 , wherein the inductance has a minimum value to maintain a loop stability criterion under operation.
13 . The method of claim 12 , wherein the inductance has a maximum value to produce a peak to peak current ripple to enhance wandering of electric arc roots on the electrode under operation.
14 . The method of claim 11 , wherein the switching converter is a DC to DC buck converter.
15 . The method of claim 11 , wherein U 0 >3000 volts.
16 . The method of claim 11 , wherein the switching converter is configured to provide between 1 and 10 MW.
17 . The method of claim 11 , wherein the welding device is a non-transferred electric arc gas heater is a non-transferred segmented plasma torch.
18 . The method of claim 17 , wherein the electrode is a hollow electrode.
19 . The method of claim 11 , wherein the switching converter is configured to produce a peak to peak current ripple of at least 50 amps over a duty cycle range of the pulse-width modulated chopper.
20 . The method of claim 19 , wherein the duty cycle range is at least 20% to 80%.Join the waitlist — get patent alerts
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