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power conversion device

A technology of power conversion and power supply side, which is applied in the direction of output power conversion device, high-efficiency power electronic conversion, electrical components, etc. It can solve the problem of reducing voltage conversion efficiency circuit design and other problems, and achieve the effect of preventing voltage surge

Active Publication Date: 2021-10-22
ACER INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above method will reduce the voltage conversion efficiency or increase the difficulty of circuit design

Method used

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Embodiment Construction

[0043] Please refer to figure 1 , figure 1 is a schematic diagram of a power conversion device according to the first embodiment of the present invention. In this embodiment, the power conversion device 100 of the present invention includes a main transformer circuit 110 , a power switch 120 , an auxiliary transformer 130 , a resonant circuit 140 and a switch circuit 150 . The main transformer circuit 110 includes a main transformer TR, a main leakage inductance Lr coupled between a primary side of the main transformer TR and a power supply Vin, an output capacitor Co coupled to a secondary side of the main transformer TR, and an output diode Do. The power conversion device 100 is applicable to an adapter (Adapter). The anode of the output diode Do is coupled to the secondary side of the main transformer TR, and the cathode of the output diode Do is coupled to the output capacitor Co. Specifically, the primary side of the main transformer TR has nodes n11 and n12 of the mai...

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Abstract

The invention provides a power conversion device. The power conversion device includes a main transformer circuit, a power switch, an auxiliary transformer, a resonant circuit and a switch circuit. When the power switch is turned on, the switching circuit is enabled according to the energy stored in the output capacitance of the main transformer circuit, so that the energy associated with the secondary side of the main transformer is coupled to the resonant circuit via the auxiliary transformer, so that the resonant circuit Get coupled energy. When the power switch is turned off, the resonant circuit and the parasitic capacitance of the power switch form a resonant circuit coupled to the ground terminal of the power supply side according to the coupling energy.

Description

technical field [0001] The invention relates to a power conversion device, in particular to a power conversion device for preventing voltage surges from being generated on a power switch. Background technique [0002] Common voltage conversion circuits, such as the flyback (flyback) voltage conversion circuit, mostly switch the power switch in hard-cut mode, which will cause high-frequency ringing on the power switch due to the inductance of the transformer inside the voltage conversion circuit. (Ring) voltage spike (voltage spike). Voltage surges increase the chance of damage to the power switch. Furthermore, when a voltage surge occurs, the power switch may be broken down by the high voltage of the voltage surge. Therefore, it is necessary to use a power switch that is more resistant to high voltage. In addition, high-frequency ringing can also cause problems such as circuit noise, electromagnetic interference (EMI), and even misoperation of voltage conversion circuits ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/34H02M3/335
CPCH02M1/34H02M3/33523H02M3/33592H02M1/344Y02B70/10
Inventor 詹子增
Owner ACER INC