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Method and device for controlling resonant transformer

A technology of resonant converter and control device, which can be applied to conversion equipment with intermediate conversion to AC, irreversible DC power input to AC power output, sustainable manufacturing/processing, etc. question

Active Publication Date: 2006-10-11
SHINRY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can meet the requirements of voltage stabilization and reduce the problem of excessive circuit loss, the circuit is relatively complicated and the cost is high

Method used

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  • Method and device for controlling resonant transformer
  • Method and device for controlling resonant transformer
  • Method and device for controlling resonant transformer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The application of the resonant converter and its control method of the present invention on UC3525, as attached Figure 11 As shown, the resonant converter device of the present invention is applied on UC3525, and its control process is as follows:

[0045] While the feedback output is connected to the feedback comparison terminal through R4, it is also connected to the oscillation frequency setting terminal RT of UC3525 through a resistor Rf, thereby changing the oscillation frequency of UC3525. In this way, when the feedback output is greater than a certain value, its control is frequency conversion control with PWM pulse width as the maximum duty cycle. When the feedback output is less than a certain value, its control is PWM pulse width control. In this way, through the control device of the present invention, we can simultaneously realize two kinds of comprehensive control of frequency conversion and PWM through a PWM control chip.

Embodiment 2

[0047] The application of the resonant converter and its control method of the present invention on UC28025, as attached Figure 12 As shown, the resonant converter device of the present invention is applied to UC28025, and its control process is similar to Embodiment 1.

Embodiment 3

[0049] The application of the resonant converter and its control method of the present invention on TL494, as attached Figure 13 As shown, the resonant converter device of the present invention is applied to TL494, and its control process is similar to Embodiment 1.

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Abstract

The disclosed control method for a resonant converter comprises: in simple RV circuit way, connecting a resistance R1 on RT end of PWM chip with another end grounding, as well as another resistance Rf with another end connecting to output of feedback regulation; or there may be resistances R3 with ends connected to Vref end and Vcpwm end of PWM chip respectively and R4 with ends connected to Vcpwm end and output of feedback regulation respectively. Compared with prior art, this invention is simple and low cost.

Description

[technical field] [0001] The invention relates to a power conversion technology, in particular to a control method and device for a resonant converter. [Background technique] [0002] Series resonant circuit and LLC series resonant circuit are circuits that have attracted the attention and research of the industry in recent years. They are relatively mature in theory, and have obvious advantages compared with phase-shifted full bridge in industrial applications, such as in variable frequency Realize the ZVS turn-on and turn-off of the primary side MOSFET (field effect transistor) within a certain range; the ZCS turn-off of the secondary side diode, and eliminate the voltage spike and turn-off loss of the secondary side; it can make the circuit have higher efficiency and lower EMI characteristics; and can work at a higher switching frequency, which can reduce the size and cost of the switching power supply; and its primary current is a sine wave, and the conduction and radiat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M3/28H02M7/48
CPCY02P80/10
Inventor 李英
Owner SHINRY TECH