![]() ![]() Followed by the output filter and snubber circuit design. This design allows the LM2577 IC to be used in step-downvoltage. Figure 1: Secondary catch diode voltage waveform, V D, with 100 VAC applied and no snubber.įorward converter topology. If this is not controlled, the secondary rectifiers will fail when full voltage is applied. A peak voltage of 175 V is seen at the leading edge of the waveform, more than three times higher than the anticipated square wave voltage of 50 V. This ringing must be suppressed before higher voltages can be applied to the converter. ![]() Kyushu Universityįigure 1 shows the ringing across the catch diode with 100 VAC applied to the primary of the converter (maximum voltage rating is 280 VAC). Voltage spikes and ringing can also be seen on the secondary of the converter. This greatly improved the ruggedness of the converter. Secondary Catch Diode Ringing Voltage In Part IV of this series of articles, the primary voltage spikes on the switching FETs were properly controlled with improved layout and high-frequency bypass capacitors. In part V, attention is turned to the secondary side of the converter, where snubbers and clamps are added to protect the output rectifiers. Ridley documents the processes involved in taking a power supply from the initial design to the full-power prototype. Introduction This article continues the series in which Dr. Forward Converter Design - Part V Snubber and Clamp Circuits Snubber and clamp design for a forward converter. Electronics And Communications In Japan Part I-communications. ![]()
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