The patent's assignee for patent number 8508959 is
News editors obtained the following quote from the background information supplied by the inventors: "The present general inventive concept relates to a multi-voltage power supply, and more particularly, to a multi-voltage power supply to independently control multiple voltages using a simple structure.
"In general, devices, such as personal computers (PCs), printers, photocopiers, monitors, and communication terminals, require a heavy-duty power supply system having a simple structure, a small size, and consistent power supply capability. Current source type power supplies are generally used for this required heavy-duty power supply system.
"FIG. 1 is a circuit diagram illustrating the basic operation of a current source type power supply called a 'flyback converter,' which is a type of direct current (DC)/DC converter.
"Referring to FIG. 1, the flyback converter includes a transformer T having a predetermined winding ratio, a primary circuit 10 connected to the primary coil, i.e., the input coil, of the transformer T, and a secondary circuit 20 connected to the secondary coil, i.e., the output coil, of the transformer T. The primary circuit 10 and the secondary circuit 20 are isolated from each other by the transformer T.
"The primary circuit 10 includes a control switch S connected in series between the primary coil of the transformer T and ground. The control switch S controls a stored energy or a transfer operation of the transformer T by switching an input voltage in response to a control signal input from an output voltage controller 30.
"The secondary circuit 20 includes a rectifier 21 which is used to rectify a current transferred from the transformer T. The rectifier 21 includes a diode D and a capacitor C, which are connected in series, and together are connected in parallel to the secondary coil of the transformer T. An output terminal is formed at the both ends of the capacitor C. That is, an external load can be connected in parallel to the capacitor C. The secondary circuit 20 also can include a filter (not illustrated) for filtering high frequency noise and Electro Magnetic Interference (EMI) and an output voltage control circuit (not illustrated).
"If the control switch S included in the primary circuit 10 is in an ON state (closed), a voltage having a polarity opposite to that of the primary coil of the transformer T is induced in the secondary coil, resulting in an inverse bias state of the diode D of the rectifier 21. Thus, a current flowing through the secondary circuit 20 is blocked, and energy is stored in the form of a magnetization inductance of the transformer T. That is, in an ON state (closed) of the control switch S, a current transfer by the transformer T is not performed, and the entire energy supplied to the primary coil is stored in the form of the magnetization inductance of the transformer T.
Most Popular Stories
- Boehner Lashes Out Against Ted Cruz, Far Right
- TFA Recruiting DACA Recipients
- Bitcoin or Bad Coin? Warnings Mount Against Virtual Currency
- Cheap Gas Drives Down U.S. Wholesale Prices Again
- Expanding Medicaid Creates Jobs: Study
- Producer Price Index Dropped in November
- Robert Levinson Was on CIA Mission
- Hawaii Official Who Release Obama Certificate Only Victim of Plane Crash
- Beyonce Releases New Album With No Marketing
- 'Dreamers' Hope for Permanent Immigration Status