US3772583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Power supply circuit
Assignee: Sony Corp
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Filing: 1972-10-24
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Granted: 1973-11-13
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Expires: 1992-10-24
Abstract
Abstract Alternating current at one of a plurality of different voltages is converted to a predetermined direct current voltage by a rectifying circuit which includes a plurality of capacitors and a rectifier connected in series with a pair of AC input terminals to charge the capacitors in such a manner as to divide the voltage between the capacitors. One of the capacitors has a pair of output terminals connected across it and a transistor switch is connected in parallel with the rectifier and the remaining capacitor to cause the current charge from the remaining capacitor to be delivered to the capacitor connected between the output terminals. A detecting circuit detects the voltage value of the input AC voltage and produces a detected output response which causes a control circuit connected to the transistor switch to change the manner of the rectifying operation of the rectifying circuit.
Inventors
- 👤 H Sahara
- 👤 T Nagai
- 👤 H Yamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:16
CPC Classifications
H; H02; H02M; H02M7/00; H02M7/02; H02M7/04; H02M7/12; H02M7/21; H02M7/217; H02M1/00; H02M1/10; H02M7/25
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
295 words
A direct current power supply circuit comprising: a. a pair of input terminals for receiving alternating current voltage, b. a pair of output terminals for delivering direct current voltage, c. a rectifying circuit connected between the input and output terminals for converting the alternating current voltage to the direct current voltage, the rectifying circuit including a series connection of at least a first capacitor, a first unidirectional device and a second capacitor connected between the input terminals, the second capacitor being connected across the output terminals, the first unidirectional device providing a unidirectional current flow to charge the first and second capacitors in such a manner as to divide the voltage between the first and second capacitors and first switching means connected across the series connection of the first capacitor and the first unidirectional device to selectively supply the current charge from the first capacitor to the second capacitor, d. detecting means for detecting the voltage value of the alternating current voltage received by the input terminals and for generating a detected output signal representative of that voltage value, e. control means connected to the rectifying circuit for changing the rectifying operation thereof by controlling the switching cycle of the first switching means, the control means including means for supplying an alternating current control signal from an external source, and second switching means responsive to the detected output signal from the detecting means and connected between the alternating current control signal supply means and the first switching means, the switching operation of the second switching means being thereby controlled by the detected output from the detecting means to transmit the alternating current control signal to the first switching means in response to the voltage value of the alternating current voltage received at the input terminals.
Claim 2
Dependent Claim
295 words
A direct current power supply circuit comprising: a. a pair of input terminals for receiving alternating current voltage, b. a pair of output terminals for delivering direct current voltage, c. a rectifying circuit connected between the input and output terminals for converting the alternating current voltage to the direct current voltage, the rectifying circuit including a series connection of at least a first capacitor, a first unidirectional device and a second capacitor connected between the input terminals, the second capacitor being connected across the output terminals, the first unidirectional device providing a unidirectional current flow to charge the first and second capacitors in such a manner as to divide the voltage between the first and second capacitors and first switching means connected across the series connection of the first capacitor and the first unidirectional device to selectively supply the current charge from the first capacitor to the second capacitor, d. detecting means for detecting the voltage value of the alternating current voltage received by the input terminals and for generating a detected output signal representative of that voltage value, e. control means connected to the rectifying circuit for changing the rectifying operation thereof by controlling the switching cycle of the first switching means, the control means including means for supplying an alternating current control signal from an external source, and second switching means responsive to the detected output signal from the detecting means and connected between the alternating current control signal supply means and the first switching means, the switching operation of the second switching means being thereby controlled by the detected output from the detecting means to transmit the alternating current control signal to the first switching means in response to the voltage value of the alternating current voltage received at the input terminals.
Claim 3
Dependent Claim
96 words
A direct current power supply as recited in claim 1 wherein the control means causes the first switching means to operate as a unidirectional device to provide half wave rectification for a first alternating current input voltage applied to the input terminals and causes the first switching means to pass current to charge the second capacitor from the first capacitor during half cycles of a given polarity of a second alternating current input voltaGe applied to the input terminals, the second input alternating current input being of a greater voltage than the first alternating current input.
Claim 4
Dependent Claim
41 words
A direct current power supply circuit as recited in claim 10, wherein the first switching means comprises a transistor having collector and emitter electrodes connected to the ends of the series connection of the first capacitor and the first unidirectional device.
Claim 5
Dependent Claim
31 words
A direct current power supply circuit as recited in claim 3, wherein the base electrode of the transistor is connected to one of the input terminals through a second unidirectional device.
Claim 6
Dependent Claim
197 words
A power supply circuit for converting alternating current at one of a plurality of predetermined voltages from an external source to direct current voltage comprising: a. a pair of input terminals for receiving the alternating current voltage, b. at least first and second capacitors connected in series with the input terminals, c. rectifier means connected in series and between the first and second capacitors, d. first switching means connected in parallel to the series connection of the first capacitor and the rectifier means for forming a conductive path in parallel with the series connection when the switching means is in its conductive state, e. a pair of output terminals to deliver a direct current voltage connected to each end of the second capacitor, f. means for detecting the voltage value of the alternating current voltage applied to the input terminals and for producing a detected output varying in response to the alternating current voltage value, and g. control means connected to the switching means and supplied both with a control signal from an external source and the detected output, the control means controlling the first switching means with the control signal in response to the detected output.
Claim 7
Dependent Claim
197 words
A power supply circuit for converting alternating current at one of a plurality of predetermined voltages from an external source to direct current voltage comprising: a. a pair of input terminals for receiving the alternating current voltage, b. at least first and second capacitors connected in series with the input terminals, c. rectifier means connected in series and between the first and second capacitors, d. first switching means connected in parallel to the series connection of the first capacitor and the rectifier means for forming a conductive path in parallel with the series connection when the switching means is in its conductive state, e. a pair of output terminals to deliver a direct current voltage connected to each end of the second capacitor, f. means for detecting the voltage value of the alternating current voltage applied to the input terminals and for producing a detected output varying in response to the alternating current voltage value, and g. control means connected to the switching means and supplied both with a control signal from an external source and the detected output, the control means controlling the first switching means with the control signal in response to the detected output.
Claim 8
Dependent Claim
56 words
A power supply circuit as recited in claim 5, wherein the control means comprises a transformer and second switching means controlled by the detected output, a primary winding of the transformer being supplied with the control signal through the second switching means and a secondary winding of the transformer being connected to the first switching means.
Claim 9
Dependent Claim
69 words
A power supply circuit as recited in claim 6, wherein the control means further includes a diode and the first switching means includes a transistor having its emitter and collector electrodes connected to the opposite ends of the series connection of the first capacitor and the rectifier means and the secondary winding of the transformer is connected between the base and emitter electrodes of the transistor through the diode.
Claim 10
Dependent Claim
29 words
A power supply circuit as recited in claim 7, wherein a third capacitor is connected across the series connection of the diode and the secondary winding of the transformer.
References Cited (Backward Citations)
US3478258A
Cited
US3713018A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |