The assignee for this patent, patent number 8508157, is
Reporters obtained the following quote from the background information supplied by the inventors: "The present invention relates to a power supply device and, more particularly, to a power supply device for driving a light emitting diode (LED) capable of controlling the switching of multiple output powers, in synchronization with the frequency of one of the multiple output powers and simplifying a power conversion stage in supplying power for driving an LED.
"A power supply device has been widely used for information devices such as a personal computer, and the like, and home appliances such as an air-conditioner, an audio system, a visual device, and the like.
"The power supply device may provide a plurality of output powers depending on the electronic devices to which the power supply device is applied.
"A general multi-power source supply device converts an input DC power into an AC power through a single transformer and then rectifies the converted AC power, respectively, to output a plurality of DC powers. However, the general multi-power source supply device has a problem in that when a voltage level of a single DC power, among the plurality of DC powers, is changed by the single transformer, the remaining DC powers are affected, so cross-regulation is therefore not maintained. To solve this problem, a step-down chopper circuit (or a buck chopper circuit) is employed at an output stage, but re-conversion of power by the step-down chopper circuit after a primary power conversion degrades power conversion efficiency and the presence of the step-down chopper circuit increases the number of components, resulting in an increase in fabrication costs.
"In addition, when the power supply device is employed to drive LEDs, a boost circuit (or a voltage step-up circuit) or a buck circuit (or a voltage step-down circuit) is required to compensate for a voltage deviation among the LEDs after the primary power conversion, which also degrades power conversion efficiency and increases the number of required components, thereby increasing fabrication costs."
In addition to obtaining background information on this patent, VerticalNews editors also obtained the inventors' summary information for this patent: "An aspect of the present invention provides a power supply device for driving a light emitting diode (LED) capable of controlling the switching of multiple output powers, in synchronization with the frequency of one of the multiple output powers and simplifying a power conversion stage in supplying power for driving an LED.
"According to an aspect of the present invention, there is provided a power supply device for driving a light emitting diode (LED), including: a power conversion unit converting an input power into a plurality of first powers according to a pre-set first conversion scheme and converting the input power into a second power according to a second conversion scheme set to be different from the first conversion scheme; a current balancing unit maintaining current balancing of the plurality of first powers from the power conversion unit; an LED driving unit supplying the plurality of first powers maintained in current balancing by the current balancing unit to a plurality of LED units, respectively, and detecting a power and a current supplied to the LED units; an operating unit performing a pre-set operation upon receiving the second power from the power conversion unit; a feedback unit having a first feedback unit feeding back a detection signal from the LED driving unit and a second feedback unit feeding back a detection signal detecting the voltage of the second power supplied to the operating unit; and a power conversion controller controlling a power conversion switching frequency of the plurality of first powers of the power conversion unit according to the detection signal from the feedback unit and controlling the duty of the second power of the power conversion unit, in synchronization with the power conversion switching frequency.
Most Popular Stories
- AIG to Create 230 Jobs in Charlotte
- 15 Myths That Could Ruin Your Hispanic Ad Campaign
- Russia Says Nyet to Canada North Pole Claim
- Bipartisan Negotiators Reach Modest Budget Agreement
- Justin Bieber Visits Typhoon Victims, Plays Concert
- Senate Dems Move Forward With Obama Nominees
- Obama Nominee Confirmed for D.C. Appeals Court
- New Obama Aide to Focus on Climate Change
- MasterCard to Split Shares, Raise Dividend
- GOP, Dems Strain to Unearth a Modest Budget Pact