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Power conversion apparatus with low power consumption and low cost

A technology for power conversion and power supply, which is used in output power conversion devices, high-efficiency power electronic conversion, conversion of DC power input to DC power output, etc. It can solve problems such as increasing power consumption, increasing transformer cost, and increasing transformer winding difficulty. , to reduce the cost and difficulty of winding, and avoid power consumption.

Active Publication Date: 2020-01-07
POWER FOREST TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The first is to power the synchronous rectification controller through the auxiliary coil of the transformer, but this method will increase the cost of the transformer and increase the difficulty of winding the transformer
The second is to use the main coil on the secondary side of the transformer to supply power to the synchronous rectification controller through the rectifier diode and the voltage regulator circuit. However, this method will increase the voltage of the main coil on the secondary side when the voltage is high. Power consumption

Method used

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  • Power conversion apparatus with low power consumption and low cost
  • Power conversion apparatus with low power consumption and low cost
  • Power conversion apparatus with low power consumption and low cost

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Embodiment Construction

[0053] In order to make the content of the present invention more comprehensible, the following specific embodiments are taken as examples in which the present invention can be implemented. In addition, wherever possible, elements / members / steps with the same reference numerals are used in the drawings and embodiments to represent the same or similar parts. In addition, the term "coupled" used in the specification may be "indirectly coupled" or "directly coupled".

[0054] The architecture of the power conversion device of the present invention may be flyback, push-pull, forward, half-bridge, or full-bridge Or other types of structures, the present invention does not limit the structure of the power conversion device. However, for the convenience of description, the following will take the power conversion device with a flyback structure as an example for illustration, and the power conversion device with other structures can be deduced by analogy.

[0055] figure 1 It is a ...

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Abstract

The invention provides a power conversion apparatus with low power consumption and low cost. The power conversion apparatus including a synchronous rectification (SR) transistor, a SR controller and asnubber circuit is provided. The SR controller is coupled to the SR transistor to control the SR transistor. A ground terminal of the SR controller is coupled to a source terminal of the SR transistor, and a power terminal of the SR controller is coupled to a system voltage. A first terminal of the snubber circuit is coupled to a drain terminal of the SR transistor. A second terminal of the snubber circuit is coupled to the power terminal of the SR controller. The snubber circuit obtains power from the drain terminal of the SR transistor and provides the system voltage accordingly.

Description

technical field [0001] The invention relates to a power conversion device, in particular to a power conversion device with low power consumption and low cost. Background technique [0002] Power conversion devices are indispensable components in modern electronic devices. In a power conversion device based on pulse width modulation (PWM) control, the secondary side of the power conversion device usually has a rectifier diode. Since the power consumption of the rectifier diode in the conduction state is large, a synchronous rectifier transistor with a lower on-resistance can be used to replace the rectifier diode. Under such an architecture, a synchronous rectification controller is still required to control the on-off of the synchronous rectification transistor on the secondary side. [0003] Generally speaking, the synchronous rectification transistor can usually be arranged at the upper end or the lower end of the secondary side of the transformer of the power conversion...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/217
CPCH02M7/217H02M1/0006H02M1/0038H02M1/0048H02M3/33592H02M1/34Y02B70/10H02M1/346H02M3/1584H02M7/219H02M1/0032
Inventor 柯柏任
Owner POWER FOREST TECH