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Switching power supply circuit

Inactive Publication Date: 2009-09-16
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 in Figure 4 is shown in . Figure 4 neutralize image 3 The same components are given the same reference numerals and descriptions thereof will be omitted.

[0108] exist Figure 4 In the power supply circuit shown, 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 bri...

no. 2 example

[0163] Figure 12 A configuration example of a power supply circuit according to the second embodiment of the present invention is illustrated. Figure 12 neutralize Figure 4 The same components are given the same reference numerals and descriptions thereof will be omitted.

[0164] exist Figure 12 In the power supply circuit shown, 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 e...

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PUM

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Abstract

The invention discloses a switching power supply circuit comprising a switch element, a converter transformer, a secondary side rectification and smoothing circuit, a switch 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 enables switching of a direct current (DC) voltage to transform the voltage into an alternating current (AC) voltage. The choke coil is supplied with voltage and connected to one winding end of the primary winding and one terminal of the switching element. The primary side series resonant circuit connects the primary side series resonant capacitor and has a resonant frequency dominated by leakage inductance. The primary side parallel resonance circuit connects the primary side parallel resonance capacitor to the switching element in parallel and has a resonance frequency. A series circuit is formed by a clamping capacitor and an auxiliary switching element that is conductive during the 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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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/48H02M7/537
Inventor 安村昌之
Owner SONY CORP
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