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Switch power source device

A switching power supply, switching technology, applied in the output power conversion device, electrical components, adjusting electrical variables and other directions, can solve problems such as the deterioration of the power factor, the inability to adjust the DC voltage, etc., to improve the power factor, high-frequency noise suppression, The effect of reducing switching loss

Inactive Publication Date: 2005-02-02
SANKEN ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the rectification smoothing circuit makes the charging current flow to the smoothing capacitor only in the peak area of ​​the sine wave AC voltage, and its disadvantages are that the power factor deteriorates and the DC voltage cannot be adjusted

Method used

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Examples

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no. 1 Embodiment

[0037] The switching power supply device of the first embodiment shown in FIG. 1 includes a pair of AC power terminals 1 and 2, a noise removal filter 3, a bridge rectifier circuit 4 composed of diodes D1, D2, D3 and D4, an inductor L1, A bypass capacitor C1, a capacitor C2 for removing high frequency components, a diode D5 for blocking reverse current, a smoothing capacitor Cdc, a transformer 5, a switch Q1, a rectifying and smoothing circuit 6 and a control circuit 7 are constituted.

[0038] A pair of AC input electronics 1, 2 is connected to, for example, a 50 Hz commercial AC power source. The noise removal filter 3 is, for example, as figure 2 As shown, the capacitors Ca and Cb connected between the pair of AC input terminals 1 and 2 and the ground, respectively, and the capacitor Cc connected between the input terminals 1 and 2 are connected in series on the pair of AC lines 1a and 1b, respectively. The inductors La and Lb are composed of , and the capacitors Cd connec...

no. 2 Embodiment

[0064] Next, a switching power supply device according to a second embodiment of the present invention will be described with reference to FIG. 5 . However, in FIG. 5, the parts that are substantially the same as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

[0065] In FIG. 5 , the inductor L1 is the same as that in FIG. 1 except that the inductor L1 is connected to the lower end of the primary coil N1 of the transformer 5 , that is, the drain of the switch Q1 , through a reverse current prevention diode D5 .

[0066] As shown in FIG. 5, if the connection point of the diode D5 for preventing reverse current is moved to the lower end of the primary coil N1, since a part of the primary coil N1 is not inserted between the inductor L1 and the switch Q1, the switch Q1 leads The current I1 flowing through the inductor increases during the conduction period, and the improvement effect of the power factor is enhanced. In additio...

no. 3 Embodiment

[0068] A switching power supply device according to a second embodiment of the present invention will be described below with reference to FIG. 6 . However, in FIG. 6, parts substantially the same as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

[0069] The circuit of FIG. 6 has a bias power supply capacitor C3 and a diode D6 added to the circuit of FIG. 1 , and the other structures are the same as those of FIG. 1 . The bias power supply capacitor C3 is connected between the reverse current blocking diode D5 and the drain of the switch Q1 which is the lower end of the primary coil N1. The diode D6 is connected between one end of the capacitor 3 and the tap 8 of the primary coil N1, and has directivity to charge the capacitor C3 so that the other end of the capacitor C3 is positive. Capacitor C3 is charged by the decaying voltage of primary winding N1 developed by switch Q1 during the OFF period. That is, the capacitor C...

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Abstract

The invention meets demands for noise reduction in a switching power supply unit wherein the improvement of power factor is feasible. A rectifying circuit 4 is connected with a smoothing capacitor Cdc through an inductor L1, a diode D5 for reverse current prevention, and the first part N1a of the primary winding N1 of a transformer 5. A series circuit of the primary winding N1 of the transformer 5 and a switch Q1 is connected in parallel with the capacitor Cdc. The secondary winding N2 of the transformer 5 is connected with a rectifying and smoothing circuit 6. A capacitor C1 for bypassing is connected between the output terminals 4c and 4 of the rectifying circuit 4. A capacitor C2 for high-frequency component removal is connected in parallel with a series circuit of the diode D5 for reverse current prevention, the second part N1b of the primary winding N1, and the switch Q1.

Description

technical field [0001] The present invention relates to a switching power supply device capable of reducing noise. Background technique [0002] A rectifier circuit composed of a diode rectifier circuit connected to an AC power source and a smoothing capacitor connected to the rectifier circuit can perform DC-AC conversion. However, the rectifying and smoothing circuit causes the charging current to flow to the smoothing capacitor only in the peak region of the sine wave AC voltage, which has the disadvantage that the power factor is deteriorated and the DC voltage cannot be adjusted. [0003] A switching power supply device for solving the disadvantages of the above-mentioned rectifying and smoothing circuit has been disclosed in Japanese Patent Laid-Open No. 8-154379. The switching power supply device disclosed here includes a rectifier circuit, a smoothing capacitor, a DC-DC conversion circuit, and an inductor for improving the power factor, that is, a reactor. When the...

Claims

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Application Information

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IPC IPC(8): H02M7/12H02M1/12H02M1/14H02M3/28H02M3/335H02M7/06
CPCH02M1/14H02M1/44H02M1/126H02M3/335H02M3/33569H02M3/01H02M7/06
Inventor 森田浩一李明濬辛昊俊安俊英
Owner SANKEN ELECTRIC CO LTD
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