Patent EP0652631A2 successfully refreshed from Google Patents.
EP0652631A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
AC/DC power supply
Assignee: Individual
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Filing: 1994-11-03
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Granted: —
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Expires: 2014-11-03
Abstract
Abstract An AC/DC power supply is connectable to either AC or DC and includes a power transformer (PTR) circuit, a rectifier circuit, and a switching circuit having first (Q1) and second switching devices (Q2) effective when the voltage input is AC and DC, respectively, to output pulses to the power transformer circuit (PTR). A control circuit (PWMC), when sensing an AC voltage input, enables the rectifier to rectify the voltage input before applied to the power transformer circuit (PTR), and also enables the first switching device (Q1) to output pulses to the power transformer circuit (PTR). The control circuit (ISC), when sensing a DC voltage input, disables the rectifier and enables the second switching (Q2) device to output pulses to the power transformer circuit (PTR). A duty-cycle control circuit (PWMC) controls both the first (Q1) and second switching devices (Q2) to control the duty cycle of the pulses supplied thereby to the power transformer (PTR) circuit.
Inventors
- 👤 Carmeli Adahan
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-31 16:08
CPC Classifications
H; H02; H02M; H02M1/00; H02M1/10; G; G05; G05F; G05F1/00; G05F1/10; G05F1/625
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
179 words
An AC/DC power supply, comprising: an input connector for connection to a voltage input of either AC or DC; a power transformer circuit; a rectifier circuit between said input connector and said power transformer circuit; a switching circuit including a first switching device effective when the voltage input is AC to output pulses to the power transformer circuit, and a second switching device effective when the voltage input is DC to output pulses to the power transformer circuit; a control circuit effective, when sensing an AC voltage input, to enable said rectifier to rectify the voltage input before applied to said power transformer circuit, and also to enable said first switching device to output pulses to the power transformer circuit; said control circuit being effective when sensing a DC voltage input, to disable said rectifier and to enable said second switching device to output pulses to the power transformer circuit; and a duty-cycle control circuit for controlling both said first and second switching devices to control the duty cycle of the pulses supplied thereby to said power transformer circuit.
Claim 2
Dependent Claim
60 words
The power supply according to claim 1, wherein said power transformer circuit includes a plurality of primary and secondary windings, and a transformer control circuit effective to connect said windings in one manner when the input connector is connected to an AC voltage input, and in a different manner when the input connector is connected to a DC voltage input.
Claim 3
Dependent Claim
56 words
The power supply according to Claim 1, wherein said power transformer circuit includes at least two transformer sections; said control circuit being effective to connect the two transformer sections in boosting relation when the input voltage is AC, and to bypass at least part of one of said transformer sections when the input voltage is DC.
Claim 4
Dependent Claim
21 words
The power supply according to claim 1, wherein the power transformer circuit is connected according to a flyback mode of operation.
Claim 5
Dependent Claim
36 words
The power supply according to claim 1, wherein said duty-cycle control circuit includes a pulse-width modulator circuit operating in the current mode and receiving an input corresponding to the input current to the power transformer circuit.
Claim 6
Dependent Claim
35 words
The power supply according to claim 5, wherein said pulse-width modulator circuit includes a further input corresponding to the output voltage of the power transformer circuit and controls the pulse-width modulator circuit in response thereto.
Claim 7
Dependent Claim
73 words
The power supply according to claim 5, further including: a starter circuit for supplying power to the switching circuit; and an input voltage sensing circuit for sensing the input voltage and effective when the input voltage reaches a first predetermined magnitude to supply power to the starter circuit, and when it reaches a second predetermined magnitude to supply power to the pulse-width modulator circuit and to disconnect the power to the starter circuit.
Claim 8
Dependent Claim
106 words
The power supply according to claim 7, wherein said input voltage sensing circuit includes: a first comparator which receives the input voltage, compares it with a first reference corresponding to said first predetermined voltage magnitude, and produces an output to said starter circuit; and a second comparator which receives the input voltage, compares wit with a second reference corresponding to said second predetermined voltage magnitude, and produces an output to said pulse width modulator circuit; said power supply further including a local shut-down circuit controlled by said pulse width modulator circuit, upon being energized by the output of said second comparator, to deenergize said starter circuit.
Claim 9
Dependent Claim
53 words
The power supply according to claim 8, wherein said control circuit includes: a relay which, when actuated, bypasses said input rectifier with respect to said power transformer circuit; and a transistor for deactuating said relay when one of said comparators of the input sensing circuit senses an input above a third predetermined voltage.
Claim 10
Dependent Claim
53 words
The power supply according to claim 7, wherein said input voltage sensing circuit includes a capacitor which is charged by an AC input voltage, and a transistor controlled by the charge on said capacitor and effective to deenergize the starter circuit when the charge on the capacitor is insufficient to energize said transistor.
References Cited (Backward Citations)
No citation records indexed.
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