US3783369A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage compensated electrical control system
Assignee: Robertshaw Controls Co
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Filing: 1971-11-05
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Granted: 1974-01-01
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Expires: 1991-11-05
Abstract
Abstract A voltage compensated electrical control system for connection to an AC source and including a gate controlled rectifier, compensating resistor connected with the source and cathode of the rectifier and voltage control means responsive to a selected voltage to be rendered conductive to initiate current flow through the resistor in proportion to the magnitude by which the selected voltage is exceeded to modify the signal imposed between the gate and cathode to compensate for the source voltage changes to prevent erratic triggering of the SCR as a result of voltage changes.
Inventors
- 👤 W Chambers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:53
CPC Classifications
G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/40; G05F1/44; G05F1/45; G05F1/455; G05D; G05D23/00; G05D23/19; G05D23/1906; G05D23/1909; G05D23/20; G05D23/24; H; H02; H02M; H02M1/00; H02M1/08; H02M1/081
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
254 words
A voltage compensated electrical control system comprising: a voltage source for producing a pulsating wave; gate controlled rectifier means for connection with said voltage source and responsive to a signal in its triggering circuit of a predetermined voltage to have its switch circuit rendered conductive; a first actuator connected with the switch circuit of said rectifier means; sensing means connected with the gate of said rectifier means and responsive to a selected condition to impose said perdetermined voltage on said gate; compensating resistor means connected in the triggering circuit of said rectifier means; voltage control means for connection with said voltage source and connected with said compensating resistor means and operative upon the attainment thereacross of a selected voltage to be rendered conductive in proportion in the magnitude by which said selected voltage is exceeded to provide for current flow through said compensating resistor means in proportion to said magnitude whereby when the triggering signal on said triggering circuit as modified by said compensating resistor exceeds said rectifier triggering voltage said controlled rectifier will be rendered conductive to initiate current flow through said actuator and when voltage changes are imposed by said source, the current flow through said compensating resistor means will be altered in proportion to said voltage changes to produce a corresponding compensating voltage differential across said resistance means to alter the triggering voltage imposed on said triggering circuit accordingly to thereby compensate for said voltage changes and prevent erratic triggering of said rectifier means as a result of said voltage changes.
Claim 2
Dependent Claim
254 words
A voltage compensated electrical control system comprising: a voltage source for producing a pulsating wave; gate controlled rectifier means for connection with said voltage source and responsive to a signal in its triggering circuit of a predetermined voltage to have its switch circuit rendered conductive; a first actuator connected with the switch circuit of said rectifier means; sensing means connected with the gate of said rectifier means and responsive to a selected condition to impose said perdetermined voltage on said gate; compensating resistor means connected in the triggering circuit of said rectifier means; voltage control means for connection with said voltage source and connected with said compensating resistor means and operative upon the attainment thereacross of a selected voltage to be rendered conductive in proportion in the magnitude by which said selected voltage is exceeded to provide for current flow through said compensating resistor means in proportion to said magnitude whereby when the triggering signal on said triggering circuit as modified by said compensating resistor exceeds said rectifier triggering voltage said controlled rectifier will be rendered conductive to initiate current flow through said actuator and when voltage changes are imposed by said source, the current flow through said compensating resistor means will be altered in proportion to said voltage changes to produce a corresponding compensating voltage differential across said resistance means to alter the triggering voltage imposed on said triggering circuit accordingly to thereby compensate for said voltage changes and prevent erratic triggering of said rectifier means as a result of said voltage changes.
Claim 3
Dependent Claim
25 words
A voltage compensated electrical control system as set forth in claim 1 wherein: said voltage control means is in the form of a zener diode.
Claim 4
Dependent Claim
25 words
A voltage compensated electrical control system as set forth in claim 1 that includes: current blocking means connected in series with said voltage control means.
Claim 5
Dependent Claim
41 words
A voltage compensated electrical control system as set forth in clAim 1 wherein: said sensing means is in the form of a temperature sensor; and said actuator is responsive to triggering of said rectifier means to actuate a temperature change unit.
Claim 6
Dependent Claim
114 words
A voltage compensated electrical control system as set forth in claim 1 wherein: said voltage is in the form of a center tapped coil having said power circuit connected between one side of said coil and said center tap and said system includes: a second actuator connected between the side of said coil opposite said one side and said switch circuit; and lead means connecting the opposite sides of said coil with one side of said voltage control means whereby said first actuator may be operated by the voltage received from one half of said coil and said second actuator may be operated by the voltage received from the other half of said coil.
Claim 7
Dependent Claim
63 words
A voltage compensated electrical control system as set forth in claim 1 wherein: said voltage source produces a cyclic wave having rounded peaks; and said compensating circuit means includes sufficient resistance to draw sufficient current therethrough to produce a sufficient voltage differential across te compensating resistor to reduce the amplitude of said peaks sufficiently to provide a resulting triggering signal having concave apexes.
Claim 8
Dependent Claim
63 words
A voltage compensated electrical control system as set forth in claim 1 wherein: said voltage source produces a rounded wave having rounded peaks and said system includes; dividing resistance means in series with said current control means for limiting the current through said compensating resistance means sufficiently to slightly flatten the cyclic peaks of said triggering voltage while maintaining said peaks convex upwardly.
Claim 9
Dependent Claim
41 words
A voltage compensating electrical control system as set forth in claim 1 wherein: said rectifier means is in the form of an SCR having its cathode-anode circuit connected with said operator and its gate-cathode circuit connected with said current control means.
Claim 10
Dependent Claim
59 words
A voltage compensating electrical control system as set forth in claim 1 wherein: said power source is in the form of a center tapped coil; said actuator is in the form of a temperature responsive resistor; and said circuit means includes a bridge responsive to a selected change in temperature of said temperature responsive resistor to actuate said actuator.
Claim 11
Dependent Claim
113 words
A voltage compensating electrical control system as set forth in claim 5 wherein: said first actuator is in the form of a heating system actuating element; said second actuator is in the form of a cooling system actuating element; said sensing means is in the form of a temperature sensing element; and system means includes a temperature responsive bridge that is responsive to cooling of said temperature sensing element below a selected temperature range to trigger said rectifier means and initiate current flow through said first actuator and is responsive to heating of said temperatures sensor above said temperature range to trigger said rectifier means and initiate current flow through said second actuator.
Claim 12
Dependent Claim
33 words
A voltage compensating temperature system as set forth in claim 1 wherein: said voltage control means is responsive to a selected voltage at least equal to said predetermined voltage to be rendered conductive.
Claim 13
Dependent Claim
70 words
A voltage compensated electrical control system as set forth in claim 1 wherein: said voltage source produces a cyclic wave having rounded peaks; and said compensating resistor means includes sufficient resistance to conduct sufficient current therethrough at voltages above said predetermined voltage to produce a sufficient voltage differential across the compensating resistor means to reduce the amplitude of said peaks sufficiently to provide a resulting triggering signal having concave apexes.
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) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |