FreshPatents.com Logo
stats FreshPatents Stats
n/a views for this patent on FreshPatents.com
Updated: April 14 2014
newTOP 200 Companies filing patents this week


    Free Services  

  • MONITOR KEYWORDS
  • Enter keywords & we'll notify you when a new patent matches your request (weekly update).

  • ORGANIZER
  • Save & organize patents so you can view them later.

  • RSS rss
  • Create custom RSS feeds. Track keywords without receiving email.

  • ARCHIVE
  • View the last few months of your Keyword emails.

  • COMPANY DIRECTORY
  • Patents sorted by company.

AdPromo(14K)

Follow us on Twitter
twitter icon@FreshPatents

Multi-output dc-to-dc conversion apparatus with voltage-stabilizing function

last patentdownload pdfdownload imgimage previewnext patent


20120292996 patent thumbnailZoom

Multi-output dc-to-dc conversion apparatus with voltage-stabilizing function


A multi-output DC-to-DC conversion apparatus with a voltage-stabilizing function includes a center-tapped main transformer, a semiconductor component group, and a triggering controller. The DC-to-DC conversion apparatus provides at least two output voltages which are a main output voltage and an auxiliary output voltage, respectively. The auxiliary output voltage is functioned as an input voltage of a buck converter; and, as a result, the auxiliary output voltage can be adjusted to obtain a lower variable DC voltage. The triggering controller is used to stabilize the main output voltage and the auxiliary output voltage. Therefore, the main transformer provides one or two secondary windings to step down the auxiliary output voltage so as to increase efficiency of the buck converter.

Inventors: Cheng-Yi LO, Chang-Chieh Yu
USPTO Applicaton #: #20120292996 - Class: 307 31 (USPTO) - 11/22/12 - Class 307 


view organizer monitor keywords


The Patent Description & Claims data below is from USPTO Patent Application 20120292996, Multi-output dc-to-dc conversion apparatus with voltage-stabilizing function.

last patentpdficondownload pdfimage previewnext patent

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a divisional application of U.S. application Ser. No. 12/824,871 filed on Jun. 28, 2010. The entire disclosure is incorporated herein by reference.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a DC-to-DC conversion apparatus, and more particularly to a multi-output DC-to-DC conversion apparatus with a voltage-stabilizing function.

2. Description of Prior Art

For a variety of electronic products, providing the most suitable DC voltage level for themselves has become a necessary trend. Thus, a useful method of converting the standard supply voltage into a required voltage for load is necessary, and which should satisfy general-purpose, high-efficiency, and high-reliability requirements. Because most electronic products, such as televisions, audios, computers, are supplied with DC-voltage electricity, the utility-line AC voltage has to be converted into DC voltages of various levels to make the electronic products perform properly.

Reference is made to FIG. 1 which is an architecture block diagram of a prior art power supply. The power supply mainly includes an EMI filter 10A, a rectifier 20A, a power factor corrector 30A, a DC-to-DC converter 40A, and a buck converter 70A. The DC-to-DC converter 40A has a plurality of power switches (not shown) and a main transformer (not shown). The EMI filter 10A is electrically connected to an AC source Vs to eliminate the conducted EMI noises in the AC lines. Therefore, in case of possible interference for different apparatuses connected to the power supply in the same distribution system could be restrained. The rectifier 20A is electrically connected to the EMI filter 10A to convert AC supply outputted form the EMI filter 10A to DC supply. The power factor corrector 30A is electrically connected to the rectifier 20A to improve the power factor of the power supply. The DC-to-DC converter 40A is electrically connected to the power factor corrector 30A to provide a voltage for the main transformer by controlling the power switches though a PWM control scheme. Therefore, the outputted DC supply of the power factor corrector 30A can be provided from the primary winding of the main transformer to the secondary winding thereof for energy conversion. The buck converter 70A is electrically connected to an output terminal Vo1 of the DC-to-DC converter 40A to provide a lower DC voltage.

The most popular power supplies provide +12V, +5Vsb, +5V, and +3.3V output voltages, which are supplied to desktop computers. For high-efficiency applications, the +12V output voltage (labeled as Vo1 in FIG. 1) is converted from the main transformer; whereas, the +5V output voltage (labeled as Vb1) and the +3.3V output voltage (labeled as Vb2) are obtained by converting the +12V voltage by the buck converter 70A. More particularly, the +12V voltage is more than two times as higher as the +5V (and even more than three times as higher as the +3.3V). Accordingly, a large voltage difference between the input voltage and the output voltage of the buck converter 70A would increase core losses of the internal magnetic components and switching losses of the power switches. Therefore, the efficiency of the buck converter 70A is reduced, particularly in much higher frequency operations.

Accordingly, it is desirable to provide, a multi-output DC-to-DC conversion apparatus with a voltage-stabilizing function to provide lower-level voltage functioned as an input voltage to the buck converter, thus increasing efficiency of the buck converter.

SUMMARY

OF THE INVENTION

In order to solve above-mentioned problems, a multi-output DC-to-DC conversion apparatus with a voltage-stabilizing function is disclosed. The multi-output DC-to-DC conversion apparatus generates a main output voltage and an auxiliary output voltage. The auxiliary output voltage is lower than the main output voltage and is functioned as an input voltage of a buck converter, and the buck converter is provided to convert the auxiliary output voltage into at least one lower adjustable DC voltage. The multi-output DC-to-DC conversion apparatus includes a main transformer, a semiconductor component group, and a triggering controller.

The main transformer has a primary winding and a secondary winding, and the secondary winding has a dotted terminal, a non-dotted terminal, and a medium terminal. The semiconductor component group is electrically connected to the dotted terminal and the non-dotted terminal of the secondary winding of the main transformer. One output terminal of the semiconductor component group is the ground, and the other output terminal is a main output terminal, which provides the main output voltage to the ground. The medium terminal is an auxiliary output terminal, which provides the auxiliary output voltage to the ground.

The triggering controller is electrically connected to the main output terminal and the auxiliary output terminal and generates a plurality of control signals to control switching frequency of the semiconductor component group for stabilizing the main output voltage and the auxiliary output voltage.

Therefore, a center-tapped of the main transformer with the secondary winding provides a lower-level voltage, which is functioned as the input voltage of the buck converter to increase efficiency of the buck converter.

It is to be understood that both the foregoing general description and the following detailed description are exemplary, and are intended to provide further explanation of the invention as claimed. Other advantages and features of the invention will be apparent from the following description, drawings and claims.

BRIEF DESCRIPTION OF DRAWING

The features of the invention believed to be novel are set forth with particularity in the appended claims. The invention itself, however, may be best understood by reference to the following detailed description of the invention, which describes an exemplary embodiment of the invention, taken in conjunction with the accompanying drawings, in which:

FIG. 1 is an architecture block diagram of a prior art power supply;

FIG. 2 is an architecture block diagram of a power supply according to the present invention;

FIG. 3A is a circuit diagram of a first embodiment of a multi-output DC-to-DC conversion apparatus with a voltage-stabilizing function according to the present invention;

FIG. 3B is a circuit diagram of the first embodiment that the multi-output DC-to-DC conversion apparatus is operated with current in a positive half-cycle;

FIG. 3C is a circuit diagram of the first embodiment that the multi-output DC-to-DC conversion apparatus is operated with current in a negative half-cycle;



Download full PDF for full patent description/claims.

Advertise on FreshPatents.com - Rates & Info


You can also Monitor Keywords and Search for tracking patents relating to this Multi-output dc-to-dc conversion apparatus with voltage-stabilizing function patent application.
###
monitor keywords



Keyword Monitor How KEYWORD MONITOR works... a FREE service from FreshPatents
1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored.
3. Each week you receive an email with patent applications related to your keywords.  
Start now! - Receive info on patent apps like Multi-output dc-to-dc conversion apparatus with voltage-stabilizing function or other areas of interest.
###


Previous Patent Application:
Demand response management system and method with var support
Next Patent Application:
Synchronous switching power supply
Industry Class:
Electrical transmission or interconnection systems
Thank you for viewing the Multi-output dc-to-dc conversion apparatus with voltage-stabilizing function patent info.
- - - Apple patents, Boeing patents, Google patents, IBM patents, Jabil patents, Coca Cola patents, Motorola patents

Results in 1.09134 seconds


Other interesting Freshpatents.com categories:
Nokia , SAP , Intel , NIKE , -g2-0.8088
     SHARE
  
           

FreshNews promo


stats Patent Info
Application #
US 20120292996 A1
Publish Date
11/22/2012
Document #
13565068
File Date
08/02/2012
USPTO Class
307 31
Other USPTO Classes
International Class
02M7/04
Drawings
6



Follow us on Twitter
twitter icon@FreshPatents