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Switching power supply

A switching power supply and switching circuit technology, which is applied in the direction of output power conversion devices, electrical components, and adjustment of electrical variables, can solve problems such as difficulty in setting and preventing resonance from deviating from Fmin, achieve magnetic flux amplitude suppression, excitation current suppression, and reduce magnetic flux. The effect of core loss

Active Publication Date: 2009-07-29
FUJI ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if Figure 10 As shown, the point at which M is the maximum varies with the load, so it is very difficult to set Fmin to prevent resonance deviation under all conditions such as sudden changes in DC power supply voltage, sudden changes in load, and overload.

Method used

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Examples

Experimental program
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Embodiment Construction

[0072] figure 1 A circuit diagram showing a switching power supply device according to a first embodiment of the first aspect of the present invention.

[0073] and Figure 5 The difference of the circuit is that a series resonant circuit is formed between the inductance components of the transformers T1 and T2, the inductance element Lz and the capacitor Cr, and the control circuit Cont1 is made to perform frequency control with an on-duty ratio of 0.5. That is, although on the circuit with Figure 5 same, but in Figure 5 There is no series resonant circuit formed in it. Additionally, usually with figure 1 and Figure 5 The elements Q1 and Q2 are connected in parallel with parasitic capacitance and internal inductance, but the illustration is omitted here.

[0074] Below, refer to figure 2 waveform diagram of the figure 1 The circuit operation will be described.

[0075] When Q1 and Q2 are switched, the inductance element Lz performs a partial resonant operation wit...

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PUM

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Abstract

The present invention provides a switching power supply with high conversion efficiency and facilitates reducing the size thereof. The switching power supply includes a half-bridge circuit including a first series circuit formed of switching devices Q1 and Q2 and connected between the output terminals of a DC power supply; and a second series circuit connecting primary inductance Lr1 of transformer T1, primary inductance Lr2 of transformer T2 and capacitor Cr in series. The second series circuit is connected between the output terminals of the half-bridge circuit, and is made to conduct a series resonance operation. The switching devices Q1 and Q2 is controlled at the ON-duties of 0.5 for reducing the breakdown voltages of rectifying diodes D1 and D2 on the secondary side of transformers T1 and T2 and for improving the conversion efficiency of the switching device.

Description

technical field [0001] The present invention relates to a switching power supply device, and more particularly to an isolated DC-DC converter (converter) for obtaining a DC output isolated from a commercial AC power supply. Background technique [0002] In order to obtain a DC output isolated from a commercial AC power supply, a DC output is generally obtained from a DC intermediate voltage obtained by rectifying and smoothing an AC voltage by an isolated DC-DC converter. In addition, in the power supply device that adopts the high harmonic standard of the input current, the DC intermediate voltage is obtained from the AC power supply through the step-up chopper circuit. [0003] Switching power supply devices are required to have high efficiency, low noise, small size, low cost, and high reliability, and various circuit systems have been proposed to realize these. [0004] Figure 5 This is an example of such a switching power supply device, and has substantially the same ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/337H02M1/08
CPCY02B70/1433H02M2007/4815Y02B70/1441H02M3/337Y02B70/1491H02M2001/0058Y02B70/10H02M1/0058H02M3/33571H02M3/01
Inventor 西川幸广
Owner FUJI ELECTRIC CO LTD
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