Flyback power converter

Abstract

A power converter (500) is described which provides multiple independently regulated outputs (T<1>, T<2>, T<3>). Zero-volt primary side switching is achieved at a resonance minimum which occurs at the end of each energy cycle as result of a resonant condition between a switch capacitor (C<5>) and a primary winding (514) of an isolation transformer (T).

Description

technical field [0001] The present invention relates generally to power conversion and, more particularly, to multiple output flyback converters. Background technique [0002] Power converters are widely used to provide the required voltage and load current, especially in more concentrated environments of communication or computer equipment. These power converters often need to provide high levels of output power in a small physical size, since space is often at a premium. This requirement indicates that the power converter is a high power density device. These higher power density concentrations also indicate that the power converter is operating as efficiently as possible in order to minimize the heating of the converter and thereby minimize its operating temperature rise. [0003] By using switching regulator technology, higher power converter efficiencies can be obtained than using linear regulation technology. However, these switching regulator technologies introduce...

AI Technical Summary

Problems solved by technology

This effect cannot be achieved using the circuit configurations of Figures 2 and 3, because those outputs that do not include the secondary switch cannot be disabled without disabling all outputs

[0012] Another disadvantage related to the circuit of Figure 4 is that the regulation method described here increases the peak output current, which results in increased ripple compared to the method of continuously supplying current to multiple outputs

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