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Synchronous rectification device

A technology of synchronous rectification and DC voltage value, applied in the direction of output power conversion device, conversion of AC power input to DC power output, electrical components, etc., can solve the problem that it is difficult to detect the drain of N-channel metal oxide half field effect transistor 20 Voltage, loss and other issues

Active Publication Date: 2020-01-14
MEANWELL GUANGZHOU ELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the power supply outputs hundreds of volts, the high voltage across the first resistor 22 will cause great loss
If the resistance value of the first resistor 22 is increased, it will be difficult for the integrated circuit 32 to detect the drain voltage of the N-channel MOSFET 20

Method used

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Embodiment Construction

[0023] Embodiments of the present invention will be further explained in conjunction with related figures below. Wherever possible, the same reference numerals have been used in the drawings and description to refer to the same or similar components. In the drawings, the shape and thickness may be exaggerated for the sake of simplification and convenient labeling. It can be understood that components not particularly shown in the drawings or described in the specification are forms known to those skilled in the art. Those skilled in the art can make various changes and modifications according to the content of the present invention.

[0024] Please Figure 4. The first embodiment of the synchronous rectification device 34 provided by the present invention is introduced below. The synchronous rectification device 34 is connected to the secondary side of a transformer 36 of a power supply and an output capacitor 38, and the output capacitor 38 is connected in parallel with a ...

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Abstract

The invention discloses a synchronous rectification device. The synchronous rectification device is connected to a secondary side of a transformer of a power supply and an output capacitor, and the synchronous rectification device comprises a rectification switch, a voltage control switch and a rectification controller. The rectification switch is connected between the secondary side and the output capacitor. The voltage control switch is provided with a voltage dividing capacitor, and the voltage control switch is connected to the secondary side to receive a secondary side voltage generated at the secondary side. The rectification controller is connected to the voltage control switch and the rectification switch. When the value of the secondary side voltage rises to a switching voltage value lower than a first voltage value, the rectification controller controls the rectification switch to be non-conductive, and, after the rectification switch is non-conductive, the voltage control switch is non-conductive, so the secondary side voltage is received by the voltage dividing capacitor, and synchronous rectification is smoothly achieved.

Description

technical field [0001] The invention relates to a synchronous rectification device, and in particular to a synchronous rectification device for a power supply. Background technique [0002] In the market, power supplies can output high voltage and constant current. Because the required power of the power supply is small, the output current is also small, and the synchronous rectifier on the secondary side of the transformer is implemented with a diode. The wider the application range of the lamp, the higher the power requirement. If the diode is still used on the secondary side to realize the synchronous rectifier, it will cause excessive loss, poor efficiency, difficult heat dissipation, shortened life of the output capacitor and shortened warranty period of the power supply. [0003] Such as figure 1 As shown, it illustrates the connection relationship between the load 10 and the diode 12 in the power supply, the secondary side of the transformer 14 and the output capac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/217
CPCH02M7/217
Inventor 邱致翔庄清闵
Owner MEANWELL GUANGZHOU ELECTRONICS
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