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, and means 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