Patent US3146937A successfully refreshed from Google Patents.
Patent US3678360A successfully refreshed from Google Patents.
US3678360A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Motor speed control with transformer feedback means
Assignee: MINARIK ELECTRIC CO
•
Filing: 1970-02-02
•
Granted: 1972-07-18
•
Expires: 1990-02-02
Abstract
Abstract A power supply circuit including a Triac for controlling the initiation of current flow to the load during each half-cycle. Firing of the Triac is directly controlled by a diac, and during each half-cycle the firing of the diac is controlled by a timing capacitor which is charged first in one direction and then in the other by current flowing from the alternating current source. In one form of the circuit the exact firing point of the diac (and hence of the Triac) is also influenced by a feedback transformer which derives a regenerative feedback voltage from the current flowing through the Triac, and which operates when the Triac current increases to advance the point at which the Triac fires. In another form of the circuit a regenerative feedback voltage is achieved without the use of a transformer, using Zener diodes for line voltage regulation and a number of resistors and capacitors suitably connected in the circuit. The circuits are illustrated as supplying current to an electric motor, which requires an increase in operating voltage in order to maintain the motor speed constant when the mechanical load on the motor increases. The purpose of the above abstract is to provide a non-legal technical statement of the disclosure of the contents of the instant patent application and thus serve as a searching-scanning tool for scientists, engineers and researchers. Accordingly, this abstract is not intended to be used in understanding or otherwise comprehending the principles of the present invention hereinafter described in detail, nor is it intended to be used in interpreting or in any way limiting the scope or fair meaning of the claims appended hereto.
Inventors
- 👤 William J Minarik
- 👤 Raymond J Mason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:59
CPC Classifications
H; H02; H02P; H02P25/00; H02P25/02; H02P25/10; H02P25/14; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/917
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
167 words
A triac voltage control circuit comprising: a triac; a triggering device; a timing capacitor coupled between one terminal of said triggering device and one power electrode of said triac; a transformer having a primary winding coupled to the other power electrode of said triac, and a secondary winding coupled between the other terminal of said triggering device and the gate terminal of said triac; a voltage source coupled in a series loop with said primary winding and the main current path of said triac; and means for charging said capacitor so as to raise the voltage across said triggering device to its breakover level; the polarity of said secondary winding being such that after the triggering device fires and said capacitor commences to discharge through the gate terminal of said triac, the initiation of current flow through the main current path of said triac and said primary winding induces a voltage in said secondary winding in such a direction as to accelerate the discharge of said capacitor.
Claim 2
Dependent Claim
167 words
A triac voltage control circuit comprising: a triac; a triggering device; a timing capacitor coupled between one terminal of said triggering device and one power electrode of said triac; a transformer having a primary winding coupled to the other power electrode of said triac, and a secondary winding coupled between the other terminal of said triggering device and the gate terminal of said triac; a voltage source coupled in a series loop with said primary winding and the main current path of said triac; and means for charging said capacitor so as to raise the voltage across said triggering device to its breakover level; the polarity of said secondary winding being such that after the triggering device fires and said capacitor commences to discharge through the gate terminal of said triac, the initiation of current flow through the main current path of said triac and said primary winding induces a voltage in said secondary winding in such a direction as to accelerate the discharge of said capacitor.
Claim 3
Dependent Claim
12 words
The circuit of claim 1 wherein said transformer is a step-up transformer.
Claim 4
Dependent Claim
17 words
The circuit of claim 1 which further includes a resistor connected in parallel with said secondary winding.
Claim 5
Dependent Claim
17 words
The circuit of claim 3 which further includes a by-pass capacitor coupled in parallel with said resistor.
Claim 6
Dependent Claim
33 words
The circuit of claim 1 wherein said transformer is a step-up transformer; and which further includes a resistor and a bypass capacitor both of which are coupled in parallel with said secondary wiNding.
Claim 7
Dependent Claim
55 words
The circuit of claim 5 wherein said resistor is a potentiometer connected between said other terminal of said triggering device and the gate terminal of said triac, said bypass capacitor being connected between the two ends of said potentiometer, and said secondary winding being connected between one end and the movable top of said potentiometer.
Claim 8
Dependent Claim
17 words
The circuit of claim 1 which further includes a resistor connected in parallel with said primary winding.
Claim 9
Dependent Claim
46 words
The circuit of claim 1 wherein said primary winding is directly connected to said other power electrode of said triac, and which further includes a load coupled in said series loop between said voltage source and the series combination of said primary winding and said triac.
Claim 10
Dependent Claim
33 words
The circuit of claim 8 wherein said charging means includes a potentiometer having one of its ends connected to the juncture of said timing capacitor and said one terminal of said triggering device.
Claim 11
Dependent Claim
22 words
The circuit of claim 8 wherein said load is connected between said voltage source and said one power electrode of said triac.
Claim 12
Dependent Claim
270 words
A triac motor speed control circuit comprising; a triac; a triggering device; a timing capacitor connected between one terminal of said triggering device and one power electrode of said triac; a transformer having a primary winding of which one end is coupled to the other power electrode of said triac, and a secondary winding couple between the other terminal of said triggering device and the gate terminal of said triac; an alternating voltage source coupled to the other end of said primary winding; means for coupling the motor between said voltage source and said one power electrode of said triac; a first resistor, a second resistor, and a first diode connected in a series circuit, the remote end of said first resistor being connected to said other end of said primary winding and the remote end of said first diode being connected to said one power electrode of said triac; a speed potentiometer connected between the juncture of said first and second resistors and said one terminal of said triggering device; and a second diode connected to the juncture of said second resistor and first diode, in opposite polarity to said first diode, its remote end being connected to the juncture of said potentiometer and timing capacitor; the polarity of said secondary winding being such that after the triggering device fires and said capacitor commences to discharge through the gate terminal of said triac, the initiation of current flow through the main current path of said triac and said primary winding induces a voltage in said secondary winding in such a direction as to accelerate the discharge of said capacitor.
Claim 13
Dependent Claim
270 words
A triac motor speed control circuit comprising; a triac; a triggering device; a timing capacitor connected between one terminal of said triggering device and one power electrode of said triac; a transformer having a primary winding of which one end is coupled to the other power electrode of said triac, and a secondary winding couple between the other terminal of said triggering device and the gate terminal of said triac; an alternating voltage source coupled to the other end of said primary winding; means for coupling the motor between said voltage source and said one power electrode of said triac; a first resistor, a second resistor, and a first diode connected in a series circuit, the remote end of said first resistor being connected to said other end of said primary winding and the remote end of said first diode being connected to said one power electrode of said triac; a speed potentiometer connected between the juncture of said first and second resistors and said one terminal of said triggering device; and a second diode connected to the juncture of said second resistor and first diode, in opposite polarity to said first diode, its remote end being connected to the juncture of said potentiometer and timing capacitor; the polarity of said secondary winding being such that after the triggering device fires and said capacitor commences to discharge through the gate terminal of said triac, the initiation of current flow through the main current path of said triac and said primary winding induces a voltage in said secondary winding in such a direction as to accelerate the discharge of said capacitor.
Claim 14
Dependent Claim
62 words
A motor speed control circuit as claimed in claim 11 which further includes a back-to-back pair of Zener diodes connected to the juncture of said first and second resistors and forming a series loop with said first resistor and said voltage source, the motor being coupled between the remote end of said first diode and the other terminal of said Zener diodes.
Claim 15
Dependent Claim
38 words
A motor speed control circuit as claimed in claim 11 wherein said transformer is a step-up transformer; and which further includes a resistor and a bypass capacitor both of which are coupled in parallel with said secondary winding.
Claim 16
Dependent Claim
60 words
A motor speed control circuit as claimed in claim 13 wherein said resistor is a potentiometer connected between said other terminal of said triggering device and the gate terminal of said triac, said bypass capacitor being connected between the two ends of said potentiometer, and said secondary winding being connected between one end and the movable tap of said potentiometer.
Claim 17
Dependent Claim
62 words
A motor speed control circuit as claimed in claim 13 which further includes a back-to-back pair of Zener diodes connected to the juncture of said first and second resistors and forming a series loop with said first resistor and said voltage source, the motor being coupled between the remote end of said first diode and the other terminal of said Zener diodes.
Claim 18
Dependent Claim
60 words
A motor speed control circuit as claimed in claim 15 wherein said resistor is a potentiometer connected between said other terminal of said triggering device and the gate terminal of said triac, said bypass capacitor being connected between the two ends of said potentiometer, and said secondary winding being connected between one end and the movable tap of said potentiometer.
Claim 19
Dependent Claim
104 words
In a motor speed control circuit, the combination comprising: a transformer having a primary winding coupled in a series loop with the motor and with a source of full-wave alternating voltage; a triac coupled into said series loop circuit to control current flow through the motor; a diac coupled to said triac for triggering same; and means for triggering the diac, including a timing capacitor, and a secondary winding of said transformer coupled between said diac and said triac and operable in response to current flowing through said primary winding to selectively add to or subtract from the voltage developed across said timing capacitor.
Claim 20
Dependent Claim
104 words
In a motor speed control circuit, the combination comprising: a transformer having a primary winding coupled in a series loop with the motor and with a source of full-wave alternating voltage; a triac coupled into said series loop circuit to control current flow through the motor; a diac coupled to said triac for triggering same; and means for triggering the diac, including a timing capacitor, and a secondary winding of said transformer coupled between said diac and said triac and operable in response to current flowing through said primary winding to selectively add to or subtract from the voltage developed across said timing capacitor.
References Cited (Backward Citations)
US3242410A
Cited
US3336517A
Cited
US3508134A
Cited
US3284688A
Cited
US3403314A
Cited
US3477003A
Cited
US3450941A
Cited
US3443189A
Cited
US3513373A
Cited
US3582745A
Cited
US3473101A
Cited
US3539892A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |