US3783361A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Triac motor speed control
Assignee: MINARIK ELECTRIC CO
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Filing: 1972-04-24
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Granted: 1974-01-01
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Expires: 1992-04-24
Abstract
Abstract A motor speed control including a full wave diode bridge rectifier for rectifying alternating current received from a supply circuit, a triac coupled in a series loop circuit with the bridge rectifier and the supply line for controlling the flow of current through the bridge rectifier during both positive and negative half-cycles of the supply line voltage, a control circuit including a diac coupled in series with a timing capacitor for controlling the firing of the triac, and a feed back loop coupled between the junction of the diac and timing capacitor and the negative output terminal of the bridge circuit.
Inventors
- 👤 R Mason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:38
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/292; H02P7/293; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/917; Y10S388/919
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
260 words
A triac motor speed control circuit comprising: a pair of supply line terminals; a triac; a diode bridge rectifier, the input terminals of said bridge rectifier being coupled in a series loop with the main current path of said triac across said pair of supply line terminals; a diac having one terminal coupled to the control gate of said triac; a speed potentiometer and a timing capacitor coupled together in series, said timing capacitor being connected between the othEr terminal of said diac and one main current terminal of said triac, said bridge rectifier being also coupled to said one main current terminal of said triac; means for coupling a motor armature to the output terminals of said bridge rectifier; a reset circuit including a resistor and a first diode coupled in series with each other and in parallel with the main current path of said triac, and a second diode having one terminal connected to the juncture of said resistor and said first diode in polarity opposite to that of said first diode, and its other terminal connected to the other terminal of said diac; a line voltage compensation circuit having a resistor and a back-to-back pair of Zener diodes connected in series, the series combination thereof being coupled in parallel with the main current terminals of said triac, the series combination of said speed potentiometer and said timing capacitor being connected in parallel with said Zener diodes; and a feedback loop connected between said other terminal of said diac and the negative output terminal of said bridge rectifier.
Claim 2
Dependent Claim
260 words
A triac motor speed control circuit comprising: a pair of supply line terminals; a triac; a diode bridge rectifier, the input terminals of said bridge rectifier being coupled in a series loop with the main current path of said triac across said pair of supply line terminals; a diac having one terminal coupled to the control gate of said triac; a speed potentiometer and a timing capacitor coupled together in series, said timing capacitor being connected between the othEr terminal of said diac and one main current terminal of said triac, said bridge rectifier being also coupled to said one main current terminal of said triac; means for coupling a motor armature to the output terminals of said bridge rectifier; a reset circuit including a resistor and a first diode coupled in series with each other and in parallel with the main current path of said triac, and a second diode having one terminal connected to the juncture of said resistor and said first diode in polarity opposite to that of said first diode, and its other terminal connected to the other terminal of said diac; a line voltage compensation circuit having a resistor and a back-to-back pair of Zener diodes connected in series, the series combination thereof being coupled in parallel with the main current terminals of said triac, the series combination of said speed potentiometer and said timing capacitor being connected in parallel with said Zener diodes; and a feedback loop connected between said other terminal of said diac and the negative output terminal of said bridge rectifier.
Claim 3
Dependent Claim
36 words
A motor speed control circuit as claimed in claim 1 wherein said feedback loop includes a fixed resistor, a capacitor in parallel with said fixed resistor, and a variable resistor in series with said fixed resistor.
Claim 4
Dependent Claim
263 words
A triac motor speed control circuit comprising: a pair of supply line terminals; a triac; a diode bridge rectifier having its input terminals coupled in series with the main current path of said triac, the series combination of said bridge rectifier and said triac being coupled across said pair of supply line terminals; a diac having one terminal coupled to the control gate of said triac; a speed potentiometer and a timing capacitor coupled together in series, the series combination thereof being coupled in parallel to said triac, said timing capacitor being also connected between the other terminal of said diac and one main current terminal of said triac; a reset circuit including a resistor and a first diode coupled in series with each other and in parallel with the main current path of said triac, and a second diode having one terminal connected to the juncture of said resistor and said first diode in polarity opposite to that of said first diode, and its other terminal connected to the other terminal of said diac; a motor of a type such that it acts as a generator when current is not being supplied to its armature armature, the motor armature being coupled to the output terminals of said bridge rectifier; and a feedback loop coupled between said other terminal of said diac and the negative output terminal of said bridge rectifier; the operation being such that the counter electromotive force generated by said motor when said triac is nonconductive diminishes with increasing load on the motor thus tending to stabilize the motor speed.
Claim 5
Dependent Claim
263 words
A triac motor speed control circuit comprising: a pair of supply line terminals; a triac; a diode bridge rectifier having its input terminals coupled in series with the main current path of said triac, the series combination of said bridge rectifier and said triac being coupled across said pair of supply line terminals; a diac having one terminal coupled to the control gate of said triac; a speed potentiometer and a timing capacitor coupled together in series, the series combination thereof being coupled in parallel to said triac, said timing capacitor being also connected between the other terminal of said diac and one main current terminal of said triac; a reset circuit including a resistor and a first diode coupled in series with each other and in parallel with the main current path of said triac, and a second diode having one terminal connected to the juncture of said resistor and said first diode in polarity opposite to that of said first diode, and its other terminal connected to the other terminal of said diac; a motor of a type such that it acts as a generator when current is not being supplied to its armature armature, the motor armature being coupled to the output terminals of said bridge rectifier; and a feedback loop coupled between said other terminal of said diac and the negative output terminal of said bridge rectifier; the operation being such that the counter electromotive force generated by said motor when said triac is nonconductive diminishes with increasing load on the motor thus tending to stabilize the motor speed.
Claim 6
Dependent Claim
51 words
A motor speed control circuit as claimed in claim 3 wherein said feedback loop includes a fixed resistor, a capacitor in parallel with said fixed resistor, and a variable resistor in series with said fixed resistor, said diode bridge rectifier being coupled to said one main current terminal of said triac.
Claim 7
Dependent Claim
66 words
A motor speed control circuit as claimed in claim 4 which further includes a line voltage compensation circuit having a resistor and a back-to-back pair of Zener diodes connected in series, the series combination thereof being coupled in parallel with the main current terminals of said triac, the series combination of said speed potentiometer and said timing capacitor being connected in parallel with said Zener diodes.
Claim 8
Dependent Claim
122 words
In a motor speed control circuit: a diode bridge rectifier having input terminals and output terminals; means for coupling a motor armature to the output terminals of said bridge rectifier; a triac having its main current path coupled in series with the input terminals of said bridge rectifier; a control circuit means for controlling the firing of said triac including a diac having one terminal connected to the control gate of said triac and another terminal, and a timing capacitor connected between the other terminal of said diac and the juncture of said bridge circuit and said triac main current path; and a feedback loop coupled between said other terminal of said diac and the negative output terminal of said bridge circuit.
Claim 9
Dependent Claim
122 words
In a motor speed control circuit: a diode bridge rectifier having input terminals and output terminals; means for coupling a motor armature to the output terminals of said bridge rectifier; a triac having its main current path coupled in series with the input terminals of said bridge rectifier; a control circuit means for controlling the firing of said triac including a diac having one terminal connected to the control gate of said triac and another terminal, and a timing capacitor connected between the other terminal of said diac and the juncture of said bridge circuit and said triac main current path; and a feedback loop coupled between said other terminal of said diac and the negative output terminal of said bridge circuit.
Claim 10
Dependent Claim
36 words
A motor speed control circuit as claimed in claim 6 wherein said feedback loop includes a fixed resistor, a capacitor in parallel with said fixed resistor, and a variable resistor in series with said fixed resistor.
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 |