US5225972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power source
Assignee: Individual
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Filing: 1992-03-10
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Granted: 1993-07-06
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Expires: 2012-03-10
Abstract
Abstract A power source driving an electrical device includes a DC power supply providing a rectified and smoothed DC voltage from an AC main power, a self-oscillator energized by the DC power supply to generate a high frequency voltage, and a transformer which provides an output voltage from the high frequency voltage for driving a load circuit of the device. The characterizing feature of the power source resides in that the self-oscillator comprises a class C amplifier and includes a bias stabilizing circuit which provides a stabilized bias to the class C amplifier for assuring constant and optimum operation irrespective of possible variations in the supply voltage as well as load variations.
Inventors
- 👤 Hiroshi Sakamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:54
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/338; H02M3/3385; H02M7/00; H02M7/42; H02M7/44; H02M7/48; H02M7/53; H02M7/537; H02M7/5383; H02M7/53832
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
145 words
A power source for driving an electrical device comprising: a DC supply providing a rectified and smoothed DC voltage from an AC power supply; a self-excited oscillator comprising an FET transistor energized by said DC power supply to generate a high frequency voltage; and a transformer providing an output AC voltage to a load circuit of said device from said high frequency voltage, wherein said self-excited oscillator comprises a Class-C amplifier and includes a bias stabilizing circuit comprising a diode and a resistor connected in series between a first end of a feedback winding of said transformer and a drain terminal of said FET transistor, wherein a second end of said feedback winding is connected to a gate terminal of said FET transistor, wherein said bias stabilizing circuit provides a stabilized bias to said Class-C amplifier for assuring constant Class-C operation at an optimum efficiency.
Claim 2
Dependent Claim
145 words
A power source for driving an electrical device comprising: a DC supply providing a rectified and smoothed DC voltage from an AC power supply; a self-excited oscillator comprising an FET transistor energized by said DC power supply to generate a high frequency voltage; and a transformer providing an output AC voltage to a load circuit of said device from said high frequency voltage, wherein said self-excited oscillator comprises a Class-C amplifier and includes a bias stabilizing circuit comprising a diode and a resistor connected in series between a first end of a feedback winding of said transformer and a drain terminal of said FET transistor, wherein a second end of said feedback winding is connected to a gate terminal of said FET transistor, wherein said bias stabilizing circuit provides a stabilized bias to said Class-C amplifier for assuring constant Class-C operation at an optimum efficiency.
Claim 3
Dependent Claim
58 words
A power source as recited in claim 1, including means for monitoring one of an output voltage of said self-excited oscillator and a load current flowing through said load circuit to produce a monitored condition, and an output control circuit for varying said bias in accordance with said monitored condition of said output voltage or said load current.
Claim 4
Dependent Claim
81 words
A power source as set forth in claim 1, wherein said transformer includes a primary winding and a load winding electromagnetically and physically detachable from said primary winding, said primary winding disposed within a main housing together with said self-oscillator and said load winding included in said load circuit of said device, said device being detachable from said main housing such that said load winding is electromagnetically coupled to said primary winding when said device is attached to said main housing.
Claim 5
Dependent Claim
47 words
A power source as set forth in claim 3, wherein said load circuit includes a charge circuit which rectifies said lowered AC voltage generated at said load winding to provide a corresponding DC voltage for charging a secondary battery such as Ni-Cd battery incorporated in said device.
Claim 6
Dependent Claim
27 words
A power source as set forth in claim 4, including impedance means for controlling to vary an impedance connected to said load winding for changing charging conditions.
Claim 7
Dependent Claim
27 words
A power source as recited in claim 1, wherein said bias stabilization circuit further includes a capacitor for providing a stabilize bias voltage to said Class-C amplifier.
Claim 8
Dependent Claim
99 words
A power source for driving an electrical device, comprising: a DC power supply providing a rectified and smoothed DC voltage from an AC power source; a self-excited oscillator energized by said DC power supply to generate a high frequency voltage; and a transformer providing an output AC voltage to a load circuit of said device from said high frequency voltage, wherein said self-excited oscillator comprises a Class-C amplifier and includes a capacitor providing a bias voltage in a bias stabilizing circuit, which provides a stabilized bias to said Class-C amplifier for assuring constant Class-C operation at an optimum efficiency.
Claim 9
Dependent Claim
99 words
A power source for driving an electrical device, comprising: a DC power supply providing a rectified and smoothed DC voltage from an AC power source; a self-excited oscillator energized by said DC power supply to generate a high frequency voltage; and a transformer providing an output AC voltage to a load circuit of said device from said high frequency voltage, wherein said self-excited oscillator comprises a Class-C amplifier and includes a capacitor providing a bias voltage in a bias stabilizing circuit, which provides a stabilized bias to said Class-C amplifier for assuring constant Class-C operation at an optimum efficiency.
Claim 10
Dependent Claim
58 words
A power source as recited in claim 7, including means for monitoring one of an output voltage of said self-excited oscillator and a load current flowing through said load circuit to produce a monitored condition, and an output control circuit for varying said bias in accordance with said monitored condition of said output voltage or said load current.
Claim 11
Dependent Claim
81 words
A power source as set forth in claim 7, wherein said transformer includes a primary winding and a load winding electromagnetically and physically detachable from said primary winding, said primary winding disposed within a main housing together with said self-oscillator and said load winding included in said load circuit of said device, said device being detachable from said main housing such that said load winding is electromagnetically coupled to said primary winding when said device is attached to said main housing.
Claim 12
Dependent Claim
47 words
A power source as set forth in claim 9, wherein said load circuit includes a charge circuit which rectifies said lowered AC voltage generated at said load winding to provide a corresponding DC voltage for charging a secondary battery such as Ni-Cd battery incorporated in said device.
Claim 13
Dependent Claim
26 words
A power source as set forth in claim 10, including impedance meas for variably controlling an impedance connected to said load winding for changing charging conditions.
Claim 14
Dependent Claim
116 words
A power source for driving an electrical device, comprising: a DC power supply providing a rectified and smoothed DC voltage from an AC power source; a self-excited oscillator comprising an amplifier element energized by said DC power supply to generate a high frequency voltage; and a transformer providing an output AC voltage to a load circuit of said device from said high frequency voltage, wherein said self-excited oscillator comprises a Class-C amplifier and includes a bias stabilization circuit comprising a resistor and a diode connected in series between one end of a feedback winding of said transformer and an output end of said amplifier element in order to provide a stabilized bias voltage for Class-C amplification.
Claim 15
Dependent Claim
116 words
A power source for driving an electrical device, comprising: a DC power supply providing a rectified and smoothed DC voltage from an AC power source; a self-excited oscillator comprising an amplifier element energized by said DC power supply to generate a high frequency voltage; and a transformer providing an output AC voltage to a load circuit of said device from said high frequency voltage, wherein said self-excited oscillator comprises a Class-C amplifier and includes a bias stabilization circuit comprising a resistor and a diode connected in series between one end of a feedback winding of said transformer and an output end of said amplifier element in order to provide a stabilized bias voltage for Class-C amplification.
Claim 16
Dependent Claim
58 words
A power source as recited in claim 12, including means for monitoring one of an output voltage of said self-excited oscillator and a load current flowing through said load circuit to produce a monitored condition, and an output control circuit for varying said bias in accordance with said monitored condition of said output voltage or said load current.
Claim 17
Dependent Claim
81 words
A power source as set forth in claim 12, wherein said transformer includes a primary winding and a load winding electromagnetically and physically detachable from said primary winding, said primary winding disposed within a main housing together with said self-oscillator and said load winding included in said load circuit of said device, said device being detachable from said main housing such that said load winding is electromagnetically coupled to said primary winding when said device is attached to said main housing.
Claim 18
Dependent Claim
47 words
A power source as set forth in claim 14, wherein said load circuit includes a charge circuit which rectifies said lowered AC voltage generated at said load winding to provide a corresponding DC voltage for charging a secondary battery such as Ni-Cd battery incorporated in said device.
Claim 19
Dependent Claim
26 words
A power source as set forth in claim 15, including impedance means for variably controlling an impedance connected to said load winding for changing charging conditions.
Claim 20
Dependent Claim
26 words
A power source as recited in claim 12, wherein a second end of said feedback winding is connected to an input end of said amplifier element.
Claim 21
Dependent Claim
15 words
A power source as recited in claim 12, wherein said amplifier element comprises a transistor.
Claim 22
Dependent Claim
34 words
A power source as recited in claim 18, wherein said transistor consists of an FET transistor, and wherein said output end of said amplifier element consists of a drain terminal of said FET transistor.
Claim 23
Dependent Claim
26 words
A power source as recited in claim 19, wherein a second end of said feedback winding is connected to a gate terminal of said FET transistor.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-07-05 | 1997-01-04 | 1997-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-07-05 | 2001-01-04 | 2001-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-07-05 | 2005-01-04 | 2005-07-06 | $7700.00 | Window Closed / Lapsed |