Pulse modulated power converter
First Claim
1. A pulse modulation power converter comprising:
- a forward path including a forward block, a switching stage for amplifying an output from the forward block, and an output filter for low pass filtering an output signal from the switching stage,a global feedback path, connected to the low pass filtered output signal, comprising a global feedback block for generating a feedback signal,means for subtracting said feedback signal from an input signal, and feeding the result to said forward path,wherein said global feedback block and/or forward block includes;
means for compensating at least a portion of a phase lag of said output filter, andmeans for obtaining a 180 degrees phase lag at a switching frequency, thereby achieving conditions for a controlled oscillation at said switching frequency.
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Abstract
A pulse modulation power converter comprising a forward path including a forward block (15), a switching stage (11) for amplifying an output from the forward block, and an output filter (12) for low pass filtering an output signal from the switching stage, a global feedback path (13), connected to the low pass filtered output signal, comprising a global feedback block (18, 19) for generating a feedback signal, and means (14) for subtracting said feedback signal from an input signal, and feeding the result to said forward path. The global feedback block and/or forward block includes means for compensating at least a portion of a phase lag of said output filter, and means for obtaining a 180 degrees phase lag at a switching frequency, thereby achieving conditions for a controlled oscillation at said switching frequency. The control system combines the advantages of the self-oscillation technology with a high gain, wide-band control loop for suppressing non-linearities. This will lead to a better performing system in terms of total harmonic distortion and noise.
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Citations
9 Claims
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1. A pulse modulation power converter comprising:
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a forward path including a forward block, a switching stage for amplifying an output from the forward block, and an output filter for low pass filtering an output signal from the switching stage, a global feedback path, connected to the low pass filtered output signal, comprising a global feedback block for generating a feedback signal, means for subtracting said feedback signal from an input signal, and feeding the result to said forward path, wherein said global feedback block and/or forward block includes; means for compensating at least a portion of a phase lag of said output filter, and means for obtaining a 180 degrees phase lag at a switching frequency, thereby achieving conditions for a controlled oscillation at said switching frequency. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification