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Patent Issued for Supply Device, and LED Lighting Equipment Using the Same

March 5, 2014



By a News Reporter-Staff News Editor at Electronics Newsweekly -- According to news reporting originating from Alexandria, Virginia, by VerticalNews journalists, a patent by the inventors Sase, Takashi (Hitachi, JP); Kanouda, Akihiko (Hitachinaka, JP); Tsuyuki, Yosuke (Odawara, JP), filed on August 22, 2011, was published online on February 18, 2014.

The assignee for this patent, patent number 8654551, is Hitachi, Ltd. (Tokyo, JP).

Reporters obtained the following quote from the background information supplied by the inventors: "The conventionally-known power-supply device of the AC-DC converter generally comprises a PFC (power factor correction) converter composed of a rectifier using a diode bridge, and a boost converter.

"In addition, US 2009-0303762A1 discloses a technology of the power-supply device using two buck converters, comprising the first buck converter and the second buck converter each composed of a diode, a switch, an inductor and an output capacitor, wherein the first buck converter is operated during a positive half-cycle period of an AC input voltage, and the second buck converter is operated during a negative half-cycle period of the AC input voltage, and obtaining a sum voltage of both ends voltage of each of the output capacitor as a DC output voltage."

In addition to obtaining background information on this patent, VerticalNews editors also obtained the inventors' summary information for this patent: "However, the method using the diode bridge as the PFC converter requires a lot of elements which increases the production cost.

"In addition, the power-supply device using the buck converter according to US 2009-0303762A1 forms a path coming back to the AC input voltage through a body diode incidental to the switch of the buck converter during the positive half-cycle period of the AC input voltage, therefore elements could be broken by an over-current. To prevent this element failure, two input diodes are required. Further, this method has a problem that two inductors, two sets of current senses which respectively control two buck converters, and two output capacitors are required as well, thereby the number of components doubled. Therefore, the number of components is not reduced adequately to reduce the cost.

"The present invention has been invented to solve such a problem and an object of the present invention is to provide the power-supply device for the AC-DC converter using the buck converter, which is able to reduce the number of components and the production cost.

"In order to solve the aforementioned problem and achieve the object, the present invention is characterized as follows.

"That is to say, the present invention is characterized in comprising the AC-DC converter composed of the two buck converters having a coupling inductor composed of the two mutually-coupled inductors, and the output capacitor.

"The present invention can provide the power-supply device for the AC-DC converter using the buck converter, wherein the power-supply device can be reduced in the number of components and produced in a low cost."

For more information, see this patent: Sase, Takashi; Kanouda, Akihiko; Tsuyuki, Yosuke. Supply Device, and LED Lighting Equipment Using the Same. U.S. Patent Number 8654551, filed August 22, 2011, and published online on February 18, 2014. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&p=50&u=%2Fnetahtml%2FPTO%2Fsearch-bool.html&r=2466&f=G&l=50&co1=AND&d=PTXT&s1=20140218.PD.&OS=ISD/20140218&RS=ISD/20140218

Keywords for this news article include: Electronics, Hitachi Ltd, Diode Bridges.

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Source: Electronics Newsweekly


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