Switching power device

A switching power supply, main switch technology, applied in the output power conversion device, electrical components, adjusting electrical variables and other directions, can solve the problems of complex circuit structure, increase in size and weight, increase in production cost, etc., to reduce costs, reduce The effect of size, quantity reduction

Inactive Publication Date: 2004-02-25
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to this method, when ICs, pulse transformers, etc. are used, the circuit structure is complicated and the production cost increases
Also, and perhaps more importantly, this increase in part count can also increase size and weight

Method used

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Examples

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Embodiment Construction

[0047] Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0048] exist figure 1 Among them, the label number 1 represents a switching power supply device, which is an application circuit generally known as a fast return to zero converter. The switching power supply device 1 includes a DC power supply E, a transformer T, a capacitor 10 , a main switching element SW1 , an auxiliary switching element SW2 , a main switching element control circuit 2 , and a differential circuit 3 .

[0049] The transformer T has a primary winding N1, a secondary winding N2, a main switching element driving winding N3, and an auxiliary switching element driving winding N4. In addition, on the secondary side of the transformer T, a rectifying diode D1 and a smoothing capacitor C4 are provided.

[0050] In addition, it is possible to use the entire part or a part of the inductive element of the primary winding and ...

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PUM

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Abstract

A switching power supply unit providing a DC output comprises a DC power supply; a transformer having a primary winding; a main switching element for connecting in series to the primary winding; and an auxiliary switching element for performing ON / OFF operations in synchronism with or opposite to ON / OFF operations performed by the main switching element; wherein an auxiliary switching element drive winding for generating a voltage turning on / off the auxiliary switching element is disposed in the transformer; and a first impedance circuit including a first resistor, a first capacitor being connected in series with the first impedance circuit, and a differentiating circuit for determining the timing for turning on the auxiliary switching element and the ON time thereof is connected to the auxiliary switching element drive winding.

Description

technical field [0001] The present invention relates to a switching power supply device having a main switching element and a single or a plurality of auxiliary switching elements which perform ON / OFF operations synchronously with or contrary to the ON / OFF operation of the main switching element. Background technique [0002] Generally, switching power supply devices have been widely used to provide stable power from AC mains in electronic equipment such as electronic computers and communication equipment. As a switching power supply device, there is provided a switching power supply device having a different circuit system such as a forward converter or a fast return converter in which a main switching element connected in series to a primary winding of a transformer is repeatedly turned on / off to The input voltage is intermittently supplied to the transformer to obtain a DC output through a rectification and smoothing circuit connected to the secondary winding of the trans...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M3/28H02M3/338
CPCH02M3/3385
Inventor 细谷达也
Owner MURATA MFG CO LTD
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