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Switching Power Supply Apparatus

A switching power supply and switching element technology, which is applied to emergency protection circuit devices, output power conversion devices, electrical components, etc., can solve the problems of larger size and rising cost of switching power supply devices, and achieve low cost effects

Active Publication Date: 2014-10-22
FUJI ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the case where an overload detection circuit is provided on the secondary side of the above-mentioned insulating transformer, the size of the structure becomes large, and it cannot be denied that this will cause an increase in the cost of the switching power supply device.

Method used

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  • Switching Power Supply Apparatus
  • Switching Power Supply Apparatus
  • Switching Power Supply Apparatus

Examples

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Embodiment Construction

[0035] Hereinafter, a current resonance type switching power supply device according to an embodiment of the present invention will be described with reference to the drawings.

[0036] figure 2 It is a schematic configuration diagram of a current resonance type switching power supply device (DC-DC rectifier) ​​according to Embodiment 1 of the present invention. This switching power supply device 1 connects the primary coil P1 of the insulating transformer T to a DC voltage source via a capacitor C5, and is mainly composed of a series resonant circuit formed by the leakage inductance of the insulating transformer T and the capacitor C5. The first switching element Q1 connected in series with the primary coil P1 of the insulating transformer T is turned on and driven by the drive control circuit (power supply IC) 2 that performs an excitation oscillation operation, and applies the input voltage Vin from the DC input voltage source. in the series resonant circuit. In addition...

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Abstract

A switching power supply apparatus, including a power converting device body configured to switch DC input power through a first switching element to thereby store the DC input power in an inductor, and to transfer the stored power to an output capacitor through a second switching element by use of resonance of the inductor, a control circuit configured to drive the first and second switching elements to alternately turn ON or OFF the two switching elements, to thereby resonate the inductor, and an overload detecting circuit configured to detect a load state of the power converting device body based on a peak value or an effective value of a resonance voltage generated from the resonance of the inductor, to thereby control operation of the control circuit.

Description

technical field [0001] The invention relates to a light-on power supply device with an overload detection circuit with high detection accuracy and simple structure. Background technique [0002] A current resonance type switching power supply device represented by a resonant DC-DC rectifier or a synchronous rectification step-up rectifier is used as a power supply device for various electronic devices because of its high efficiency and suitability for thinning. In addition, such a switching power supply device is usually provided with a protection function, which protects the load by detecting the overload state of the switching power supply device and stopping the conduction drive of switching elements such as IGBTs or MOS-FETs. And the above-mentioned switching elements, etc. [0003] Incidentally, conventionally, the above-mentioned overload has been detected by monitoring the output power of the secondary side of the switching power supply device, for example, an isolat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/335H02H7/12
CPCH02M1/32H02M3/33523H02M3/3376H02M1/0058Y02B70/10H02M1/0019
Inventor 陈建
Owner FUJI ELECTRIC CO LTD
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