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Switching power supply circuit

A technology of switching power supply circuits and switching elements, which is applied in the direction of electrical components, output power conversion devices, irreversible DC power input conversion to AC power output, etc., can solve problems such as difficult to reach saturation state, and achieve cost reduction and size reduction Effect

Inactive Publication Date: 2007-04-04
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the coupling coefficient k has such a value, the degree of coupling between the primary and secondary sides can be regarded as weak coupling, making it difficult to reach a saturated state

Method used

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Examples

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no. 1 example

[0107] As one of the power supply circuits of the embodiment, a configuration example of the power supply circuit according to the first embodiment of the present invention is shown in FIG. 4 . Components in FIG. 4 that are the same as those in FIG. 3 are given the same reference numerals and descriptions thereof will be omitted.

[0108] In the power supply circuit shown in FIG. 4, a choke coil PCC (inductor L10) having a choke coil winding N10 is added to the primary side of the voltage resonant converter, thereby realizing class E switching operation. The coupling coefficient between the primary winding N1 and the secondary winding N2 in the isolation converter transformer PIT is set to 0.8 or less, which corresponds to weak coupling. On the secondary side, a secondary side partial voltage resonance capacitor C4 is connected in parallel to the secondary winding N2, thereby constructing a multiple resonant converter deriving a DC output voltage from a full-wave bridge. In a...

no. 2 example

[0163] FIG. 12 illustrates a configuration example of a power supply circuit according to a second embodiment of the present invention. Components in FIG. 12 that are the same as those in FIG. 4 are given the same reference numerals and descriptions thereof will be omitted.

[0164] In the power supply circuit shown in FIG. 12, a choke coil PCC (inductor L10) having a choke coil winding N10 is added to the primary side of the voltage resonant converter to realize class E switching operation. The coupling coefficient between the primary winding N1 and the secondary winding N2 in the isolation converter transformer PIT is set to 0.8 or less, which corresponds to weak coupling. On the secondary side, a secondary-side series resonant capacitor C4 is connected in series to the secondary winding N2 to construct a multiple resonant converter deriving a DC output voltage from the full-wave bridge. In addition, a series circuit of clamp capacitor C3 and auxiliary switching element Q2 ...

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Abstract

A switching power supply circuit includes a switching element, a converter transformer, a secondary-side rectifying and smoothing circuit, a switching element control unit, a choke coil, a primary-side series resonant circuit, a primary-side parallel resonant circuit, and a series circuit. The switching element implements switching for a direct-current (DC) voltage to convert the voltage into an alternating-current (AC) voltage. The choke coil is supplied with the voltage and is connected to one winding end of the primary winding and one terminal of the switching element. The primary-side series resonant circuit connects a primary-side series resonant capacitor, having a resonant frequency dominated by a leakage inductance. The primary-side parallel resonant circuit connects a primary-side parallel resonant capacitor in parallel to the switching element, having a resonant frequency. The series circuit is formed of a clamp capacitor and an auxiliary switch element which conducts in a non-conducting period of the switching element.

Description

technical field [0001] The present invention relates to switching power supply circuits. Background technique [0002] As types of so-called soft-switching power supplies using a resonant converter, a current resonance type and a voltage resonance type have been widely known. Currently, a half-bridge type current resonant converter formed of two transistor switching elements has been widely used because it can be easily put into practical use. [0003] However, since the characteristics of, for example, high breakdown voltage switching elements are currently being improved, problems related to breakdown voltage associated with putting voltage resonant converters into practical use are also being solved. Furthermore, it is known that a single-ended voltage resonant converter formed by a switching element of one transistor is superior to a current resonant forward converter of one transistor in terms of noise components of the DC output voltage line and input feedback noise. ...

Claims

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Application Information

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IPC IPC(8): H02M7/48H02M7/537
Inventor 安村昌之
Owner SONY CORP
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