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Resonant converter

a resonant converter and converter technology, applied in the field of electronic circuits, can solve the problems of large switching loss, inability to increase the control frequency of the switch, and inability to increase the so as to improve the dynamic response and power density of the resonant converter, and effectively reduce the switching loss.

Pending Publication Date: 2022-01-27
SHENZHEN HUNTKEY ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The resonant converter described in the patent text has several technical effects. First, it uses a transformer in a way that reduces switching loss and allows it to work at high frequencies. Second, a frequency controller is used to control each switching device, which simplifies the feedback circuit and improves the dynamic response of the converter. Third, a flexible control system is used that allows for the output of energy to the secondary side as needed, improving the power density and efficiency of the converter. Overall, the resonant converter described in the patent text offers improved performance and simplified control over current output.

Problems solved by technology

This leads to large switching losses on the primary side, and the control frequency of the switch cannot be increased, and the higher the control frequency of the switch, the larger the power loss, resulting in the power density of the resonant converter also cannot be increased.

Method used

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Experimental program
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Effect test

first embodiment

The First Embodiment

[0029]As shown in FIG. 1, this embodiment provides a resonant converter including an input terminal M1, an output terminal M2, a first switch Q1, a second switch Q2, a frequency controller 10, a resonant capacitor C1, a first transformer TX1, a second transformer TX2, a feedback circuit, a third switch Q3, and a fourth switch Q4. The input terminal M1 is connected to an external power supply V1 and the output terminal M2 is connected to an external load R1. The first switch Q1 and the second switch Q2 are connected in series between the input terminal M1 and ground, the control terminal of the first switch Q1 and the control terminal of the second switch Q2 are both connected to the frequency controller 10. The common terminal connected to the first switch Q1 and the second switch Q2 is connected to one terminal of resonant capacitor C1. The primary side of the first transformer TX1 is connected in series with the primary side of the second transformer TX2. The f...

second embodiment

The Second Embodiment

[0052]As shown in FIG. 2, this embodiment provides a resonant converter including an input terminal M1, an output terminal M2, a first switch Q1, a second switch Q2, a frequency controller 10, a resonant capacitor C1, a first transformer TX1, a second transformer TX2, a feedback circuit 30, a third switch Q3, and a fourth switch Q4. The input terminal M1 is connected to an external power supply V1 and the output terminal M2 is connected to an external load R1. The first switch Q1 and the second switch Q2 are connected in series between the input terminal M1 and ground. The control terminal of the first switch Q1 and the control terminal of the second switch Q2 are both connected to the frequency controller 10. The common terminal connected to the first switch Q1 and the second switch Q2 is connected to one terminal of resonant capacitor C1. The primary side of the first transformer TX1 is connected in series with the primary side of the second transformer TX2. T...

third embodiment

The Third Embodiment

[0073]As shown in FIG. 3, the difference between the structure of this embodiment and the second embodiment is that: on the secondary side of the transformer, the sources of the control signals of the third switch and the fourth switch are different. In this embodiment, the synchronous rectification controller 40 is used to output the third control signal of the third switch and the fourth control signal of the fourth switch, instead of using the two NOT gates and the two isolation driver modules in FIG. 2.

[0074]The first input terminal of the synchronous rectification controller 40 is connected to the first terminal of the secondary side of the first transformer TX1, and the second input terminal of the synchronous rectification controller 40 is connected to the second terminal of the secondary side of the second transformer TX2. The synchronous rectification controller 40 is used to output the fourth control signal of the fourth switch Q4 according to the volta...

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PUM

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Abstract

A resonant converter includes an input terminal, an output terminal, a first switch, a second switch, a third switch, a fourth switch, a frequency controller, a resonant capacitor, a first transformer, a second transformer and a feedback circuit. The input terminal is connected to an external power supply and the output terminal is connected to an external load. The frequency controller is located on the same side as the secondary side of the first transformer and the second transformer, and the frequency controller is configured to output a first control signal to control the first switch, a second control signal to control the second switch, a third control signal to control the third switch and a fourth control signal to control the fourth switch.

Description

FIELD OF THE INVENTION[0001]The present invention relates to the field of electronic circuits, and more particularly, to resonant converters.BACKGROUND OF THE INVENTION[0002]Resonant converters usually take an unstable DC current as an input and convert it to a stable DC voltage. The voltage level and current level vary depending on the application requirements. Resonant converters are usually used as a constant voltage source for power integrated circuits. In the past decades, many circuit topologies have been applied to various converters. The main types can be classified as fixed frequency pulse width modulation (PWM) converters and variable frequency resonant converters.[0003]LLC half-bridge resonant converter has higher efficiency, narrower operating voltage range and slower dynamic response. The forward / flyback converter controlled by fixed frequency pulse width modulation has lower efficiency, wider operating voltage range and faster dynamic response, and is widely used in in...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): H02M3/335H02M1/00
CPCH02M3/33576H02M3/33571H02M1/0054H02M3/33507Y02B70/10H02M3/01H02M3/33592H02M3/33573Y02P80/10H02M1/0006
Inventor DUAN, WEIYIN
Owner SHENZHEN HUNTKEY ELECTRIC