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US 2017/0324382 A1Published application
Self-oscillating amplifier with high order loop filter
AssigneeICEpower a/s
InventorKennet Skov Andersen
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Abstract
A self-oscillating amplifier system is disclosed. The system comprises a pulse modulator, a switching power amplification stage and a demodulation filter. Moreover, the system comprises a compensator including a forward filter which is a high order filter including a second order pole pair and a second order zero pair. Hereby it is possible to decrease the phase turn at low frequencies for better stability and increasing the gain of the control loop within the desired bandwidth.
Claims9
A self-oscillating amplifier system having an input and an output, said system comprising:
- a pulse modulator for modulating an input signal to form a pulse modulated signal;
- a switching power amplification stage having switching output for amplification of the pulse modulated signal to form a switching output signal;
- a demodulation filter including a second order pole pair, to demodulate the switching output signal;
- wherein the system further comprises a compensator including a forward filter which is a high order filter including a second order pole pair and a second order zero pair thereby enabling a decrease of a phase turn at low frequencies for better stability and increasing a gain of a control loop within the bandwidth.
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Dependencies are inferred from the claim text.