US3935522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control device for the electric fan
Assignee: Individual
•
Filing: 1974-01-08
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Granted: 1976-01-27
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Expires: 1994-01-08
Abstract
Abstract A control device for an electric fan comprising a power supply, a control means, a trigger pulse generator and a switch means, all connected in circuit with the motor of the electric fan, wherein the trigger pulse output of said trigger pulse generator is connected to trigger said switch means and is controlled through said control means to thereby achieve a stepless, variable speed control for the electric fan. Other forms of the device may further comprise a delay means, and/or delay reverse means, and/or wave generator means and/or any combination thereof, connected in the above circuit to accomplish stepless speed reduction and/or delay speed-down reverse and/or various kinds of imitative natural wind rotational speeds for the electric fan.
Inventors
- 👤 Peter Wen-Tien Tsay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:40
CPC Classifications
H; H02; H02P; H02P25/00; H02P25/02; H02P25/04; F; F04; F04D; F04D27/00; F04D27/004; Y; Y02; Y02B; Y02B30/00; Y02B30/70; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/909; Y10S388/917
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
259 words
A motor speed control circuit for an electric fan motor to control the speed of operation of the fan motor, said circuit comprising: a. a power supply means; b. speed control circuit means connected with said power supply means, said speed control circuit means comprising a control means and a delay speed reduction means which includes a charge-discharge circuit, a large capacitor, and a first switch means which is connected between said power supply means and said charge-discharge circuit; c. trigger pulse generator means connected with said speed control circuit means and with said power supply means, whereby pulses generated by said trigger pulse generator means are controlled through said speed control circuit means to accomplish variable speed control of said fan motor; d. and output switch means connected with said trigger pulse generator means and with said fan motor, which is in turn connected to an AC source, to receive trigger pulses from said trigger pulse generator means and to supply power to said fan motor, whereby when said first switch means is on, said large capacitor is quickly charged to enable said charge-discharge circuit to charge up to the full range of output signal so that said fan motor performs a normal operation and through the control of said control means the speed control of said normal operation of said fan motor is thus obtained, and when said first switch means is off, said large capacitor is discharged and said fan motor speed is gradually reduced from said normal operation speed to a predetermined relatively low speed.
Claim 2
Dependent Claim
259 words
A motor speed control circuit for an electric fan motor to control the speed of operation of the fan motor, said circuit comprising: a. a power supply means; b. speed control circuit means connected with said power supply means, said speed control circuit means comprising a control means and a delay speed reduction means which includes a charge-discharge circuit, a large capacitor, and a first switch means which is connected between said power supply means and said charge-discharge circuit; c. trigger pulse generator means connected with said speed control circuit means and with said power supply means, whereby pulses generated by said trigger pulse generator means are controlled through said speed control circuit means to accomplish variable speed control of said fan motor; d. and output switch means connected with said trigger pulse generator means and with said fan motor, which is in turn connected to an AC source, to receive trigger pulses from said trigger pulse generator means and to supply power to said fan motor, whereby when said first switch means is on, said large capacitor is quickly charged to enable said charge-discharge circuit to charge up to the full range of output signal so that said fan motor performs a normal operation and through the control of said control means the speed control of said normal operation of said fan motor is thus obtained, and when said first switch means is off, said large capacitor is discharged and said fan motor speed is gradually reduced from said normal operation speed to a predetermined relatively low speed.
Claim 3
Dependent Claim
39 words
The motor speed control circuit according to claim 1 further comprising a high input impedance means connected between said delay speed reduction means and said control means to provide a further delay of speed reduction for said fan motor.
Claim 4
Dependent Claim
47 words
The motor speed control circuit according to claim 36 further comprising wave generator means connected between said power supply means and said control means which produces a predetermined wave output to control the speed of rotation of said motor to obtain a simulation of natural wind conditions.
Claim 5
Dependent Claim
16 words
The motor speed control circuit of claim 1, wherein the control means includes a variable resistor.
Claim 6
Dependent Claim
29 words
The motor speed control circuit of claim 1, wherein indicating lamp means is connected across the terminals of the fan motor to indicate the speed of the fan motor.
Claim 7
Dependent Claim
18 words
The motor speed control ciruit according to claim 2, wherein the high input impedance means comprises a FET.
Claim 8
Dependent Claim
17 words
The motor speed control circuit according to claim 1, wherein said output switch means comprises a TRIAC.
Claim 9
Dependent Claim
134 words
The motor speed control circuit according to claim 1 wherein said trigger pulse generator means further comprises a resistor connected between said power supply means and said trigger pulse generator means, and a second switch means connected in parallel with said resistor, and when said first switch means is on, the circuit is operable to effect normal operation for said fan motor; and when said first switch means is off and said second switch means is on, said delay speed reduction means of the circuit is gradually operable to reduce the fan motor to a breezy speed operation; and when the first switch means is off and said second switch means is off, said delay speed reduction means of the circuit is gradually operable to reduce the speed of said fan motor to zero.
Claim 10
Dependent Claim
49 words
The motor speed control circuit according to claim 1 wherein said delay speed reduction means of said speed control circuit means further comprises a high input impedance means connected to an output terminal of said charge-discharge circuit to provide a further delay of speed reduction for said fan motor.
Claim 11
Dependent Claim
49 words
The motor speed control circuit according to claim 8 wherein said delay speed reduction means of said speed control circuit means further comprises a high input impedance means connected to an output terminal of said charge-discharge circuit to provide a further delay of speed reduction for said fan motor.
Claim 12
Dependent Claim
77 words
The motor speed control circuit according to claim 1 wherein said speed control circuit means further comprises a delay-reverse means connected to an output of said charge-discharge circuit and with said power supply means, wherein said delay-reverse means includes relay circuit means, and when the rotational speed of said motor reduces to a predetermined speed, said relay selectively operates to control said fan motor by selectively connecting a winding in said motor to provide a reverse rotation.
Claim 13
Dependent Claim
77 words
The motor speed control circuit according to claim 8 wherein said speed control circuit means further comprises a delay-reverse means connected to an output of said charge-discharge circuit and with said power supply means, wherein said delay-reverse means includes relay circuit means, and when the rotational speed of said motor reduces to a predetermined speed, said relay selectively operates to control said fan motor by selectively connecting a winding in said motor to provide a reverse rotation.
Claim 14
Dependent Claim
63 words
The motor speed control circuit according to claim 1 wherein said speed control circuit means comprises a wave generator means selectively operated through a third switch means connected to said power supply means and said trigger pulse generator means which produces a predetermined wave output to control the speed of rotation of said fan motor to obtain a simulation of natural wind conditions.
Claim 15
Dependent Claim
63 words
The motor speed control circuit according to claim 8 wherein said speed control circuit means comprises a wave generator means selectively operated through a third switch means connected to said power supply means and said trigger pulse generator means which produces a predetermined wave output to control the speed of rotation of said fan motor to obtain a simulation of natural wind conditions.
Claim 16
Dependent Claim
63 words
The motor speed control circuit according to claim 10 wherein said speed control circuit means comprises a wave generator means selectively operated through a third switch means connected to said power supply means and said trigger pulse generator means which produces a predetermined wave output to control the speed of rotation of said fan motor to obtain a simulation of natural wind conditions.
Claim 17
Dependent Claim
48 words
The motor speed control circuit of claim 1 wherein said power supply means further comprises a voltagevariation compensation circuit means connected to an output of said power supply means and operable to prevent variations in line voltage from causing undesired variations in rotational speed of said fan motor.
Claim 18
Dependent Claim
31 words
The motor speed control circuit according to claim 9, wherein said high input impedance means comprises one of an FET, MOSFET, SCR, CSCR, PUT, SCS, Darlington's pair transistors, and equivalent means.
Claim 19
Dependent Claim
35 words
The motor speed control circuit according to claim 1 further comprising a sudden stop switch means connected in series with the power supply circuit so that the termination of delay speed reduction is selectively obtained.
Claim 20
Dependent Claim
29 words
The motor speed control circuit of claim 1, wherein indicating lamp means is connected across the terminals of the fan motor to indicate the speed of the fan motor.
Claim 21
Dependent Claim
170 words
A motor speed control circuit for an electric fan comprising: a. a power supply means; b. speed control circuit means connected with said power supply means, said speed control means including a wave generator means which comprises one of an oscillator and counter; c. trigger pulse generator means connected with said speed control circuit means and with said power supply means, whereby pulses generated from said trigger pulse generator means are controlled by said speed control circuit means; d. and output switch means connected with said trigger pulse generator means and with said fan motor, which is in turn connected to an AC source, to receive trigger pulses from said trigger pulse generator means and to supply power to said fan motor; whereby e. when said wave generator means is energized, it produces a predetermined wave output to said trigger pulse generator means to thereby control the speed of rotation of said fan motor to obtain a simulation of natural wind conditions by fluctuating the speed of said fan motor.
Claim 22
Dependent Claim
170 words
A motor speed control circuit for an electric fan comprising: a. a power supply means; b. speed control circuit means connected with said power supply means, said speed control means including a wave generator means which comprises one of an oscillator and counter; c. trigger pulse generator means connected with said speed control circuit means and with said power supply means, whereby pulses generated from said trigger pulse generator means are controlled by said speed control circuit means; d. and output switch means connected with said trigger pulse generator means and with said fan motor, which is in turn connected to an AC source, to receive trigger pulses from said trigger pulse generator means and to supply power to said fan motor; whereby e. when said wave generator means is energized, it produces a predetermined wave output to said trigger pulse generator means to thereby control the speed of rotation of said fan motor to obtain a simulation of natural wind conditions by fluctuating the speed of said fan motor.
Claim 23
Dependent Claim
29 words
The motor speed control circuit according to claim 20 wherein said speed control circuit means further comprises a control means to control the variable speed of said fan motor.
Claim 24
Dependent Claim
23 words
The motor speed control circuit according to claim 20 wherein said output switch means comprises one of TRIAC, SCR, SSS, and equivalent means.
Claim 25
Dependent Claim
45 words
The motor speed control circuit according to claim 20 wherein the wave generated by said wave generator means is selectively regular or irregular and said wave is generated by one of a PUT, UJT, SCS, SUS, SBS, DIAC, multi-oscillator, extreme low frequency oscillator, and counter.
Claim 26
Dependent Claim
45 words
The motor speed control circuit according to claim 21 wherein the wave generated by said wave generator means is selectively regular or irregular and said wave is generated by one of a PUT, UJT, SCS, SUS, SBS, DIAC, multi-oscillator, extreme low frequency oscillator and counter.
Claim 27
Dependent Claim
22 words
The motor speed control circuit according to claim 23 wherein said regular wave is generated by one of an oscillator and counter.
Claim 28
Dependent Claim
24 words
The motor speed control circuit according to claim 23 wherein said irregular wave is generated by the resultant wave of at least two oscillators.
Claim 29
Dependent Claim
29 words
The motor speed control circuit of claim 20, wherein indicating lamp means is connected across the terminals of the fan motor to indicate the speed of the fan motor.
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) | 1979-01-26 | 1979-07-28 | 1980-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-26 | 1983-07-28 | 1984-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-26 | 1987-07-28 | 1988-01-27 | $7700.00 | Window Closed / Lapsed |