US3573595A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Constant current feedback regulator with adjustable impedance for maintaining constant current
Assignee: VENUS SCIENTIFIC Inc
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Filing: 1969-05-28
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Granted: 1971-04-06
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Expires: 1989-05-28
Abstract
Abstract A high-voltage power supply has a controlled output oscillator operated from a low-voltage DC source. The output voltage of the oscillator is increased by a voltage multiplier. A series circuit comprising a high ohmic resistor, a transistor device and an adjustable low ohmic resistor is connected in parallel with the oscillator output, and the transistor impedance is varied to maintain a constant current in the parallel path. The voltage developed at the transistor for maintaining a constant current is then used to control the oscillator in order to maintain constant output voltage.
Inventors
- 👤 Filippo B Galluppi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:57
CPC Classifications
H; H02; H02M; H02M3/00; H02M3/22; H02M3/24; H02M3/28; H02M3/325; H02M3/335; H02M3/338; H02M3/3385; H02M3/3387; H02M3/3388; G; G05; G05F; G05F1/00; G05F1/10; G05F1/12; G05F1/40; G05F1/44
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
219 words
A high voltage power supply comprising, in combination: a. an input voltage source; b. an oscillator circuit connected to said input voltage source and having an output voltage control means; c. voltage increasing circuit means connected to the output of said oscillator and having an output voltage; d. a constant current circuit means connected in parallel with the output voltage of said voltage increasing circuit means; said constant current circuit means comprising a relatively high ohmic resistor, a variable impedance means having a control electrode for varying the impedance thereof, and a relatively low ohmic resistor; e. a feedback circuit including an amplifier means having an input circuit and an output circuit; said input circuit connected across said relatively low ohmic resistor; said output circuit connected to said control electrode of said variable impedance means; said amplifier means varying the impedance of said adjustable impedance means to maintain a constant current in said parallel circuit; and f. control circuit means having an input and an output circuit; said input circuit of said control circuit means connected across said variable impedance means; said output circuit of said control circuit means connected to said output control circuit means of said oscillator circuit thereby to vary the output voltage of said power supply to maintain a constant current in said parallel circuit.
Claim 2
Dependent Claim
219 words
A high voltage power supply comprising, in combination: a. an input voltage source; b. an oscillator circuit connected to said input voltage source and having an output voltage control means; c. voltage increasing circuit means connected to the output of said oscillator and having an output voltage; d. a constant current circuit means connected in parallel with the output voltage of said voltage increasing circuit means; said constant current circuit means comprising a relatively high ohmic resistor, a variable impedance means having a control electrode for varying the impedance thereof, and a relatively low ohmic resistor; e. a feedback circuit including an amplifier means having an input circuit and an output circuit; said input circuit connected across said relatively low ohmic resistor; said output circuit connected to said control electrode of said variable impedance means; said amplifier means varying the impedance of said adjustable impedance means to maintain a constant current in said parallel circuit; and f. control circuit means having an input and an output circuit; said input circuit of said control circuit means connected across said variable impedance means; said output circuit of said control circuit means connected to said output control circuit means of said oscillator circuit thereby to vary the output voltage of said power supply to maintain a constant current in said parallel circuit.
Claim 3
Dependent Claim
14 words
The power supply of claim 1 wherein said relatively low ohmic resistor is adjustable.
Claim 4
Dependent Claim
49 words
The power supply of claim 1 wherein said relatively high ohmic resistor has a resistance which is of the order of 1,000 times as large as said relatively low ohmic resistor and wherein the current in said parallel circuit is of the order of several hundred microamperes or less.
Claim 5
Dependent Claim
17 words
The power supply of claim 1 wherein said variable impedance means said control circuit means are transistors.
Claim 6
Dependent Claim
31 words
The power supply of claim 1 wherein said amplifier means includes a reference voltage input circuit connected to a fixed voltage source for comparison to the voltage of said input circuit.
Claim 7
Dependent Claim
149 words
In a high-voltage power supply comprising an input DC voltage conversion means having a voltage varying control circuit connected to said input DC voltage for converting said DC voltage to an AC voltage of a magnitude dependent upon the voltage applied to said control circuit, and an output voltage control circuit for applying a voltage to said control circuit to maintain a constant output voltage; said output voltage control circuit comprising an output voltage measuring circuit in parallel with said output voltage of said power supply, a variable impedance means in said voltage measuring circuit for maintaining a constant current therethrough regardless of variations in said output voltage of said power supply and circuit means connecting a voltage related to the voltage drop across said variable impedance means to said voltage varying control circuit; and said variable impedance including the series connection of a transistor and an adjustable resistor.
Claim 8
Dependent Claim
149 words
In a high-voltage power supply comprising an input DC voltage conversion means having a voltage varying control circuit connected to said input DC voltage for converting said DC voltage to an AC voltage of a magnitude dependent upon the voltage applied to said control circuit, and an output voltage control circuit for applying a voltage to said control circuit to maintain a constant output voltage; said output voltage control circuit comprising an output voltage measuring circuit in parallel with said output voltage of said power supply, a variable impedance means in said voltage measuring circuit for maintaining a constant current therethrough regardless of variations in said output voltage of said power supply and circuit means connecting a voltage related to the voltage drop across said variable impedance means to said voltage varying control circuit; and said variable impedance including the series connection of a transistor and an adjustable resistor.
Claim 9
Dependent Claim
26 words
The device of claim 6 wherein said constant current circuit includes a series resistor having a resistance substantially greater than the impedance of said variable impedance.
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) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |