Resonant DC-DC converter of multi-output type

• US 20060170288A1
• Filed: 01/25/2006
• Published: 08/03/2006
• Est. Priority Date: 01/28/2005
• Status: Abandoned Application

• Current Assignee: Sanken Electric Company Limited
• Original Assignee: Sanken Electric Company Limited
• Inventors: Usui, Hiroshi
• Application Number:
  US11/339,967
• Publication Number:
  US 20060170288A1
• Time in Patent Office: Days
• US Class Current: 307/17
• CPC Class Codes: H02M 3/01 Resonant DC/DC converters
• CPC Class Codes: H02M 3/33523 with galvanic isolation between input and output of both the power stage and the feedback loop
• CPC Class Codes: H02M 3/33571 Half-bridge at primary side of an isolation transformer
• CPC Class Codes: Y02B 70/10 Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

A DC-DC converter of multi-output type is provided wherein first and second MOS-FETs 1 and 2 are alternately turned on and off to take a plurality of DC outputs out of a plurality of secondary windings 4b, 4c and 4d of a transformer 4 through related rectifying smoothers 12, 22 and 32. A first DC output from first secondary winding 4b is controlled by adjusting a duty ratio of first and second MOS-FETs 1 and 2. At least one magnetic amplifier 21, 31 is connected in series between each of second or more secondary windings 4c and 4d and related rectifying smoother 22 and 32 to adjust reset current to the magnetic amplifier 21, 31, thereby generating stabilized DC-outputs V_O2 and V_O3 from the second or more secondary windings 4c, 4d.

Claims

1. A DC-DC converter of multi-output type, comprising:

first and second switching elements connected in series to a DC power source,

a series circuit of a capacitor, a current resonance inductance and a primary winding of a transformer connected in series between a junction of the first and second switching elements and DC power source,

a control circuit for alternately turning said first and second switching elements on and off to produce a plurality of DC outputs from plural secondary windings of the transformer each through rectifying smoother, and

at least one magnetic amplifier connected in series between each of second or more secondary windings and related rectifying smoothers,

wherein the first DC output produced from the first secondary winding is controlled by adjusting a duty ratio of said first and second switching elements, and

adjustment of reset current to the magnetic amplifier causes to control the DC-outputs from the second or more secondary windings.

2. The DC-DC converter of multi-output type of claim 1, wherein polarity of half-wave rectification is different between at least one of second or more secondary windings and first secondary winding of the transformer.

3. The DC-DC converter of multi-output type of claim 1 or 2, wherein a plurality of DC outputs are produced from said rectifying smoothers in the form of half-wave rectification.

4. The DC-DC converter of multi-output type of claim 1, wherein said first and second switching elements are alternately turned on and off with the drive signals inclusive of predetermined pauses from said control circuit.

5. A DC-DC converter of multi-output type, comprising:

first and second switching elements connected in series to a DC power source,

a first series circuit of first and second current resonance capacitors connected in parallel to said first and second switching elements,

a second series circuit of a current resonance inductance and a primary winding of a transformer connected between a junction of said first and second switching elements and a junction of said first and second current resonance capacitors,

a control circuit for alternately turning said first and second switching elements on and off to produce a plurality of DC outputs from plural secondary windings of the transformer each through rectifying smoother, and

at least one magnetic amplifier connected in series between each of second or more secondary windings and related rectifying smoother,

wherein a first DC output from said first secondary winding is controlled by adjusting a duty ratio of said first and second switching elements, and

adjustment of reset current to the magnetic amplifier causes to control the DC-outputs from the second or more secondary windings.