US3872374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power control timing circuits with power line compensation
Assignee: Ranco Inc of Delaware
•
Filing: 1970-07-28
•
Granted: 1975-03-18
•
Expires: 1990-07-28
Abstract
Abstract Line voltage compensation is provided by a power control timing circuit for gated power control devices, which utilizes a negative resistance impedance for establishing the timing capacitor charging voltage, thereby determining the conduction angle to maintain power applied to a load relatively constant, notwithstanding fluctuations in the power line voltage.
Inventors
- 👤 Clarence E Rasmussen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:44
CPC Classifications
H; H02; H02M; H02M5/00; H02M5/02; H02M5/04; H02M5/22; H02M5/25; H02M5/257; H02M5/2573; G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/40; G05F1/44; G05F1/445; G05F1/45; G05F1/455; H05; H05B; H05B39/00; H05B39/04; H05B39/08
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
113 words
In a power control circuit including a source of AC line voltage, and a load and grated power control device in series across the source of AC line voltage; a line voltage compensating timing network coupled across the source of AC line voltage comprising a charging potential network including a negative impedance device and a first resistor in series for establishing a charging potential from the source of AC line voltage and a capacitive timing network having a second resistor and timing capacitor in series shunting said negative impedance device whereby the charging potential is applied to said timing capacitor, and said timing capacItor coupled to the gate of said power control device.
Claim 2
Dependent Claim
113 words
In a power control circuit including a source of AC line voltage, and a load and grated power control device in series across the source of AC line voltage; a line voltage compensating timing network coupled across the source of AC line voltage comprising a charging potential network including a negative impedance device and a first resistor in series for establishing a charging potential from the source of AC line voltage and a capacitive timing network having a second resistor and timing capacitor in series shunting said negative impedance device whereby the charging potential is applied to said timing capacitor, and said timing capacItor coupled to the gate of said power control device.
Claim 3
Dependent Claim
35 words
The power control circuit of claim 1 wherein a trigger diode device couples said timing capacitor to the gate of said power control device and said negative impedance device is a bilateral breakback semiconductor diode.
Claim 4
Dependent Claim
26 words
The power control circuit of claim 1 wherein said power control device comprises a bilateral semiconductor device and said impedance device comprises a bilateral semiconductor element.
Claim 5
Dependent Claim
27 words
The power control circuit of claim 3 wherein said timing capacitor is coupled to the gate of said power control device by a bilateral semiconductor trigger diode.
Claim 6
Dependent Claim
144 words
An AC power control circuit for connection in series circuit relationship with a load across an AC line voltage source comprising a power control semiconductor device having a pair of power electrodes and a control electrode, said pair of power electrodes providing the AC power control circuit connection in series circuit relationship with the load across the AC line voltage source, and a line voltage compensating timing network coupled across the pair of power electrodes comprising a charging potential network including a negative impedance device and a first resistor in series for establishing a charging potential from the AC line voltage source and a capacitive timing network having a second resistor and timing capacitor in series connected in shunt across the negative impedance device whereby the charging potential is coupled to said timing capacitor, said timing capacitor output being coupled to the control electrode.
Claim 7
Dependent Claim
144 words
An AC power control circuit for connection in series circuit relationship with a load across an AC line voltage source comprising a power control semiconductor device having a pair of power electrodes and a control electrode, said pair of power electrodes providing the AC power control circuit connection in series circuit relationship with the load across the AC line voltage source, and a line voltage compensating timing network coupled across the pair of power electrodes comprising a charging potential network including a negative impedance device and a first resistor in series for establishing a charging potential from the AC line voltage source and a capacitive timing network having a second resistor and timing capacitor in series connected in shunt across the negative impedance device whereby the charging potential is coupled to said timing capacitor, said timing capacitor output being coupled to the control electrode.
Claim 8
Dependent Claim
104 words
A power control circuit for the maintenance of relatively constant load power irrespective of line voltage variations about a normal value including a source of AC line voltage, a load and a gated semiconductor power control device in series across the source of AC line voltage, a charging potential network having a first resistor and a negative impedance device in series coupled across said source of AC line voltage, and a capacitive timing network having a second resistor and timing capacitor in series shunting said negative impedance device, the output of said timing capacitor network coupled to the gate of said power control device.
Claim 9
Dependent Claim
104 words
A power control circuit for the maintenance of relatively constant load power irrespective of line voltage variations about a normal value including a source of AC line voltage, a load and a gated semiconductor power control device in series across the source of AC line voltage, a charging potential network having a first resistor and a negative impedance device in series coupled across said source of AC line voltage, and a capacitive timing network having a second resistor and timing capacitor in series shunting said negative impedance device, the output of said timing capacitor network coupled to the gate of said power control device.
Claim 10
Dependent Claim
46 words
The power control circuit of claim 6 wherein said power control device is a bilateral semiconductor device, said negative impedance device comprises a bilateral semiconductor element and said timing capacitor being coupled to said gate of said power control device by a bilateral semiconductor trigger diode.
Claim 11
Dependent Claim
151 words
An AC power control circuit for connection in series circuit relationship with a load across an AC line voltage source comprising a power control semiconductor device having a pair of power electrodes and a control electrode, said pair of power electrodes providing the AC power control circuit connection in series circuit relationship with the load across the AC line voltage source, and a line voltage compensating timing network coupled across the series circuit of the pair of power electrodes and the load comprising a charging potential network including a negative impedance device and a first resistor in series for establishing a charging potential from the AC line voltage source and a capacitive timing network having a second resistor and timing capacitor in series connected in shunt across the negative impedance device whereby the charging potential is coupled to said timing capacitor, said timing capacitor output being coupled to the control electrode.
Claim 12
Dependent Claim
151 words
An AC power control circuit for connection in series circuit relationship with a load across an AC line voltage source comprising a power control semiconductor device having a pair of power electrodes and a control electrode, said pair of power electrodes providing the AC power control circuit connection in series circuit relationship with the load across the AC line voltage source, and a line voltage compensating timing network coupled across the series circuit of the pair of power electrodes and the load comprising a charging potential network including a negative impedance device and a first resistor in series for establishing a charging potential from the AC line voltage source and a capacitive timing network having a second resistor and timing capacitor in series connected in shunt across the negative impedance device whereby the charging potential is coupled to said timing capacitor, said timing capacitor output being coupled to the control electrode.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |