Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Rectangular or pulse waveform width control
Patent
1998-02-13
2000-07-04
Lam, Tuan T.
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Rectangular or pulse waveform width control
327176, H03K 708
Patent
active
060844507
ABSTRACT:
A new nonlinear control technique that has one cycle response, does not need a resettable integrator in the control path, and has nearly constant switching frequency. It obtains one cycle response by forcing the error between the switched-variable and the control reference to zero each cycle, while the on-pulse of the controller is adjusted each cycle to ensure near constant switching frequency. The small switching frequency variation due to variations in the reference signal and supply voltage and delays in the circuit are quantified. Using double-edge modulation, the switching frequency variation is further reduced, thus the associated signal distortion is minimized. An experimental 0-20 kHz bandwidth, 95 Watt RMS power audio amplifier using the control method demonstrates the applicability of this control technique for high fidelity audio applications. The amplifier has a power supply ripple rejection (PSRR) of 63 dB at 120 Hz. Additionally, the total harmonic distortion plus noise (THD+N) is less is than 0.07% measured with a power supply ripple of 15%.
REFERENCES:
patent: 3659184 (1972-04-01), Schwarz
patent: 4577154 (1986-03-01), Takagi et al.
patent: 4843339 (1989-06-01), Burt
patent: 5278490 (1994-01-01), Smedley
patent: 5617306 (1997-04-01), Lai et al.
patent: 5877637 (1999-03-01), Trofimenkoff et al.
Lai Zheren
Smedley Keyue M.
Smith K. Mark
Lam Tuan T.
O'Banion John P.
The Regents of the University of California
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