Electric power conversion systems – Current conversion – With means to introduce or eliminate frequency components
Reexamination Certificate
2006-07-11
2006-07-11
Han, Jessica (Department: 2838)
Electric power conversion systems
Current conversion
With means to introduce or eliminate frequency components
C331S17700V
Reexamination Certificate
active
07075803
ABSTRACT:
With self oscillating pulse width modulators, using a hysteretic comparator to change the output duty cycle according to the input signal, as often used for example for Class-D amplifiers or switching regulators, the frequency varies with output power and supply voltage. The disclosed invention presents a method to drastically reduce the frequency variation by introducing the combination of an analog and a digital feedback loop to shift the hysteretic threshold, ideally by providing a single absolute value, which is proportional to the pulse frequency and by alternating the polarity of shifting the hysteretic threshold, based on the actual output pulse phase.
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Ackerman Stephen B.
Dialog Semiconductor GmbH
Han Jessica
Saile Ackerman LLC
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