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Power supply switching device with sudden wave buffer circuit

A technology of power conversion and electronic devices, which is applied in the direction of conversion equipment without intermediate conversion to AC, and can solve problems such as the inability to absorb surges and increase capacitance

Active Publication Date: 2008-02-20
QISDA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the power conversion device works in the heavy load mode, since the energy absorbed by the parallel combination of the capacitor C11 and the resistor R11 is low, the surge cannot be absorbed, and the electromagnetic interference (EMI) becomes serious.
On the contrary, if you want to effectively absorb the surge, you must increase the energy that can be absorbed by the parallel combination of capacitor C11 and resistor R11, but the noise problem cannot be solved

Method used

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  • Power supply switching device with sudden wave buffer circuit
  • Power supply switching device with sudden wave buffer circuit
  • Power supply switching device with sudden wave buffer circuit

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Embodiment Construction

[0032] Referring to FIG. 2 , FIG. 2 is a schematic diagram of a power conversion device 200 provided by the present invention. The power conversion device 200 includes: a capacitor C21 (in a preferred embodiment of the present invention, its capacitance value may be 680-1000pF), a capacitor C22 (in a preferred embodiment of the present invention, its capacitance value may be 10KpF), a resistor R21 (in a preferred embodiment of the present invention, its resistance value can be 68K ohms), resistor R22 (in a preferred embodiment of the present invention, its resistance value can be 68K ohms), resistor R23, the first switch unit D21, the second Two switch unit TVS2 (in a preferred embodiment of the present invention, it can be a diode, and the breakdown voltage to make it conduction is 110-130V), the third switch element Q21, switch node A2, voltage source node B2+, ground Node F2 and transformer element TF2. The capacitor C21 and the resistor R21 are combined in parallel to for...

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Abstract

The utility model relates to a power supply conversion device with low noise surge buffer circuits, which is able to reduce noises under light-load mode and avoid electromagnetic interference under heavy-load mode. The utility model comprises a voltage source pitch point, a switching pitch point, a grounding pitch point, a transformer element, a third switching element, a first surge buffer cell, a first switch unit, a second surge buffer cell, and a second switching unit. Under the light-load mode, only the first surge buffer is used to absorb the energy stored in the transformer element to reduce noises. While under the heavy-load mode, the first and second suffer buffers are both switched into conduction to absorb higher energy and reduce electromagnetic interference.

Description

technical field [0001] The invention relates to a power conversion device, in particular to a power conversion device with a low-noise surge buffer circuit. Background technique [0002] Electronic devices usually contain different components, and the operating voltage required by each component may be different. Therefore, in an electronic device, it is necessary to use a power conversion device to realize level adjustment (boosting or bucking) and stabilize it at a set voltage value. In the prior art, the control mode of the power conversion device is usually designed according to the Pulse Width Modulation (PWM) technology or the Pulse Frequency Modulation (PFM) technology, so as to achieve the purpose of switching the power supply. [0003] Referring to FIG. 1 , FIG. 1 is a schematic diagram of a power conversion device 100 in the prior art. The power conversion device 100 includes: a capacitor C11 , a resistor R11 , a resistor R21 , a first switch unit D11 , a second ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/07
Inventor 王博文叶佳翅黄建锟
Owner QISDA CORP