US4970439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power supply circuit for a gaseous discharge tube device
Assignee: Global Traffic Technologies LLC
•
Filing: 1989-04-28
•
Granted: 1990-11-13
•
Expires: 2009-04-28
Abstract
Abstract An improved power supply circuit for supplying power to intermittently energized loads, such as gaseous discharge tube devices. Such power supply has a transformer wherein current flow in the primary winding is controlled by a first semiconductor device that in turn is controlled by a second semiconductor device. A feedback circuit coupled to the primary winding provides a signal for turn-off of the first semiconductor device when its turn-off is initiated by the second semiconductor device. A circuit portion connected between the primary winding and the second semiconductor device provides a signal to the second semiconductor device when it initiates a turn-off of the first semiconductor device. Such signal continues operation of the second semiconductor device until the turn-off signal from the feedback circuit is effective to turn-off the first semiconductor device serving to reduce power dissipated in the first semiconductor device.
Inventors
- 👤 James L. Stopa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:37
CPC Classifications
H; H03; H03K; H03K3/00; H03K3/02; H03K3/53; H03K3/57; H03K17/00; H03K17/04; H03K17/042; H03K17/04206; H03K17/51; H03K17/56; H03K17/687; H03K17/6877; H05; H05B; H05B41/00; H05B41/14; H05B41/30; H05B41/32; H03K2217/00; H03K2217/0036; Y; Y10; Y10S; Y10S315/00; Y10S315/07
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
184 words
An improved power supply circuit which includes a transformer having a primary winding, a first semiconductor device in series with the primary winding for controlling current flow in the primary winding, a second semiconductor device connected to the first semiconductive device for controlling the operation of the first semiconductive device and a feedback circuit including a winding coupled to the primary winding and connected to the first semiconductor device providing a signal for turn-off of the first semiconductor device following the initiation of the turn-off of the first semiconductor device by the second semiconductor device, the improvement including: a circuit portion connected between the primary winding of the transformer and the second semiconductive device for supplying a signal to the second semiconductor device when the second semiconductor device operates to initiate the turn-off of the first semiconductor device to continue such operation of the second semiconductor until the signal from the feedback circuit for turn-off of the first semiconductive device is effective, whereby the speed at which the first semiconductor device is turned-off is enhanced thereby reducing power dissipated in the first semiconductor device.
Claim 2
Dependent Claim
184 words
An improved power supply circuit which includes a transformer having a primary winding, a first semiconductor device in series with the primary winding for controlling current flow in the primary winding, a second semiconductor device connected to the first semiconductive device for controlling the operation of the first semiconductive device and a feedback circuit including a winding coupled to the primary winding and connected to the first semiconductor device providing a signal for turn-off of the first semiconductor device following the initiation of the turn-off of the first semiconductor device by the second semiconductor device, the improvement including: a circuit portion connected between the primary winding of the transformer and the second semiconductive device for supplying a signal to the second semiconductor device when the second semiconductor device operates to initiate the turn-off of the first semiconductor device to continue such operation of the second semiconductor until the signal from the feedback circuit for turn-off of the first semiconductive device is effective, whereby the speed at which the first semiconductor device is turned-off is enhanced thereby reducing power dissipated in the first semiconductor device.
Claim 3
Dependent Claim
22 words
An improved power supply circuit according to claim 1 wherein said circuit portion includes a resistor connected in series with a capacitor.
Claim 4
Dependent Claim
30 words
An improved power supply circuit according to claim 1 wherein said second semiconductor device is a transistor having a base electrode with said circuit portion connected to said base electrode.
Claim 5
Dependent Claim
22 words
An improved power supply circuit according to claim 3 wherein said circuit portion includes a resistor connected in series with a capacitor.
Claim 6
Dependent Claim
55 words
An improved power supply circuit according to claim 1 wherein said first semiconductor device is a field effect transistor having a gate electrode, said second semiconductor device is a transistor having a base electrode and a collection electrode, said gate electrode connected to said collector electrode and said circuit portion connected to said base electrode.
Claim 7
Dependent Claim
22 words
An improved power supply circuit according to claim 5 wherein said circuit portion includes a resistor connected in series with a capacitor.
References Cited (Backward Citations)
US4027199A
Cited
US4321507A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-11-12 | 1994-05-14 | 1994-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-11-12 | 1998-05-14 | 1998-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-11-12 | 2002-05-14 | 2002-11-13 | $7700.00 | Window Closed / Lapsed |