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Switching power supply circuit

A switching power supply circuit and switching element technology, applied in high-efficiency power electronic conversion, climate sustainability, irreversible DC power input conversion to AC power output and other directions, can solve problems such as difficulty in reaching saturation, and reduce the amount of current , Power loss reduction, the effect of eliminating abnormal operation

Inactive Publication Date: 2007-03-07
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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Embodiment Construction

[0069] Before describing the best mode for realizing the present invention (hereinafter referred to as an embodiment), a switching converter for implementing class E resonant switching operation (hereinafter also referred to as an embodiment) is described as a background technology of an embodiment with reference to FIG. 8 and FIG. 9 . It is called the basic configuration of Class E switching converter).

[0070] Figure 8 illustrates the basic configuration of a Class E switching converter. The Class E switching converter in the figure has a configuration such as a DC-AC converter operating in a Class E resonant mode.

[0071] The class E switching converter includes a transistor switching element Q1. In this converter, switching element Q1 is a MOS-FET. Body diode DD is connected in parallel with the channel between the drain and source of MOS-FET switching element Q1. The forward direction of the body diode DD is the same as the direction from the source to the drain of t...

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Abstract

In the switching power supply circuit disclosed in an embodiment of the present invention, the DC voltage is supplied to the primary winding in the converter transformer and the AC voltage is generated. First and second series resonant circuit are formed, and the resonant frequency of the first and second series resonant circuits are set to be substantially equal to each other. A parallel resonant circuit is formed, and the resonant frequency of the parallel resonant circuit is set higher than the resonant frequencies of the first and second series resonant circuits. The secondary winding includes first and second secondary windings so that currents are extracted from the first and second secondary windings, respectively, and a ratio of the number of turns of the first secondary winding to that of the second secondary winding is defined so that magnitudes of the currents are substantially equal to each other.

Description

[0001] Cross References to Related Applications [0002] The present invention contains subject matter related to Japanese Patent Application JP2005-255182 filed in Japan Patent Office on September 2, 2005, and Japanese Patent Applications JP2005-256576 and JP2005-256577 filed in Japan Patent Office on September 5, 2005, all of which The contents are hereby incorporated by reference. technical field [0003] The present invention relates to switching power supply circuits. Background technique [0004] 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. [0005] However, since the characteristics of, for example, high breakdown voltage switching elements are currently being improved, problems related ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/42H02M7/48
CPCY02B70/1433Y02B70/1491
Inventor 安村昌之
Owner SONY CORP
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