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Switching power supply circuit

A technology of switching power supply circuit and series resonant circuit, which is applied in the direction of high-efficiency power electronic conversion, electrical components, and adjustment of electrical variables, etc., which can solve the problems of power conversion efficiency (reduced overall efficiency, etc.), achieve easy circuit board pattern design, and reduce withstand voltage , The effect of reducing switching noise

Inactive Publication Date: 2007-09-19
SONY CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0024] First, as shown in Figure 25, the power conversion efficiency (overall efficiency) decreases when the load power Po increases

Method used

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  • Switching power supply circuit
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Examples

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no. 1 example

[0079]As this embodiment, a modification of the class E switching converter described above is applied to a power supply circuit. The structure of the switching power supply circuit according to the first embodiment shown in FIG. 1 will be described below. The switching power supply circuit according to the first embodiment includes: a rectification smoothing section, a converter section, and a power factor improving section. The rectification smoothing section converts the input AC voltage from the AC power supply AC into a primary side DC voltage. The converter section converts the primary-side DC voltage from the rectification smoothing section into an AC voltage, and then also converts the AC voltage into a secondary-side DC voltage. The power factor improvement section improves power factor. The rectification smoothing section includes a primary side rectification element Di supplied with an input AC voltage from an AC power source AC and rectifies the input AC voltage,...

no. 2 example

[0134] In the switching power supply circuit according to the second embodiment shown in FIG. 6, the same components as those of the first embodiment are denoted by the same reference numerals, and redundant description thereof will be omitted. The switching power supply circuit according to the second embodiment employs many components of the same structure as the first embodiment. The difference between the second embodiment and the first embodiment is that a slow rectifying element is used as the primary side rectifying element Di, wherein the slow rectifying element can rectify the mains AC voltage with a frequency of 50 or 60 Hz. Furthermore, let the fast rectification element D1 be a rectification element for making the resonance current flowing through the primary-side first series resonance circuit and the primary-side second series resonance circuit flow in one direction. In order to make the resonant current flowing through the fast rectification element D1 with a fr...

no. 3 example

[0137]In the switching power supply circuit according to the third embodiment shown in FIG. 7, the same components as those of the first embodiment are denoted by the same reference numerals, and redundant description thereof will be omitted. The switching power supply circuit according to the third embodiment employs many of the same structural components as those of the first embodiment. The third embodiment differs from the first embodiment in that the power factor improving portion flows a current corresponding to the voltage generated in the primary side series resonance capacitor from the AC power source via the primary side rectifying element. As for the converter section, the third embodiment differs from the first embodiment in that the choke coil PCC is provided between the primary side rectifying element Di and the smoothing capacitor Ci instead of the power factor improving inductor Lo. Furthermore, the primary winding N1 of the inverter transformer PIT is connecte...

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Abstract

The present invention provides a switching power supply circuit which may include a rectifying and smoothing section, a converter section, and a power factor improving section. The rectifying and smoothing section may include a primary side rectifying element and a smoothing capacitor. The converter section may include a choke coil, a converter transformer, a main switching element, an oscillating and driving circuit, a primary side series resonant capacitor, a primary side parallel resonant capacitor, and an active clamping circuit. The power factor improving section may add and pass a current corresponding to a voltage generated in the primary side series resonant capacitor to the smoothing capacitor via the primary side rectifying element.

Description

[0001] Cross References to Related Applications [0002] The subject matter contained in the present invention is related to Japanese Patent Application JP 2006-067730 filed in the Japan Patent Office on Mar. 13, 2006, the entire contents of which are hereby incorporated by reference. technical field [0003] The present invention relates to switching power supply circuits used as power supplies for various electronic devices. Background technique [0004] Most power circuits that rectify mains AC power and provide the required DC voltage are now switched mode power circuits. Switching power supply circuits have transformers and other devices miniaturized by increasing the switching frequency, and are used as power sources for various electronic devices such as high-power DC-DC converters. [0005] Mains AC power is a sinusoidal AC voltage. When the smooth rectification circuit of the rectifier element and smoothing capacitor is used to rectify and smooth the AC power of t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/00H02M1/14H02M1/42H02M3/28H02M3/338H02M7/48H02M7/537H02M7/5383
CPCY02B70/126H02M1/4241H02M1/4258Y02B70/10H02M3/28
Inventor 安村昌之
Owner SONY CORP
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