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Control method for switching power supply circuit

A switching power supply and control system technology, applied in control/regulation systems, high-efficiency power electronic conversion, electrical components, etc., can solve problems such as low output voltage, energy shortage, etc., to prevent output voltage from decreasing, reduce transformer excitation sound, The effect of reducing power consumption

Active Publication Date: 2006-09-13
FUJI ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the load becomes heavier than assumed, insufficient energy is fed to the secondary side of the transformer, resulting in a low output voltage

Method used

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  • Control method for switching power supply circuit
  • Control method for switching power supply circuit
  • Control method for switching power supply circuit

Examples

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Embodiment Construction

[0043] The present invention will now be explained in detail with reference to the accompanying drawings showing preferred embodiments of the present invention.

[0044] figure 1 It is a block diagram of the switching power supply circuit according to the first embodiment of the present invention.

[0045] See now figure 1 , The switching power supply circuit according to the first embodiment and Picture 10 The difference of the conventional switching power supply circuit shown in is that the current detection circuit 4 replaces the current detection resistor 10 in the conventional switching power supply circuit in the switching power supply circuit according to the first embodiment of the present invention. Because the operation of the switching power supply circuit according to the first embodiment is also Picture 10 The operation of the conventional switching power supply circuit shown in is the same, and the repeated description is omitted.

[0046] figure 2 for figure ...

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Abstract

A control system for controlling a switching power supply circuit includes a setting device that limits the exciting current of a transformer at the time of changeover from a switching delay to a switching period. The setting value set by the setting device is changed slowly to prevent the exciting current of transformer from changing rapidly and to reduce the excitation noise of transformer, and the setting value is changed gradually to prevent the output voltage from lowering even when the load becomes heavier than a certain value during the light load operation. The control method facilitates reducing the electric power consumption of the switching power supply circuit under a light load, reducing the transformer excitation noise and preventing the output voltage from lowering when the load is light.

Description

Technical field [0001] The present invention relates to a control system for controlling a switching power supply circuit that is suspended during periods of no switching to reduce its power consumption when the load is light. In particular, the present invention relates to a control system that facilitates reducing the excitation sound of a transformer and stabilizing its switching operation. Background technique [0002] Some traditional switching power supply circuits set a switching pause to stop the switching operation of their switching device, which is used to reduce the power consumption when the load is light. However, the excitation current flowing through the transformer changes greatly when switching between the switching period and the switching pause. During the switching pause, the switching stops, causing the transformer excitation sound. [0003] The following Patent Document 1 discloses a switching power supply circuit that eliminates the above-mentioned problem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/28H02M3/335
CPCY02B70/16H02M2001/0032H02M3/33523H02M1/0032Y02B70/10H02M3/28
Inventor 藤田宪司西川幸广
Owner FUJI ELECTRIC CO LTD