Miscellaneous active electrical nonlinear devices – circuits – and – Signal converting – shaping – or generating – Rectangular or pulse waveform width control
Reexamination Certificate
2008-04-01
2008-04-01
Vu, Bao Q. (Department: 2838)
Miscellaneous active electrical nonlinear devices, circuits, and
Signal converting, shaping, or generating
Rectangular or pulse waveform width control
C327S172000, C327S176000, C363S137000
Reexamination Certificate
active
11350933
ABSTRACT:
A method and arrangement for determining the effective time of a voltage pulse of phase voltage generated by a frequency converter provided with an intermediate voltage circuit, the voltage pulses of the phase voltage being generated from the upper and lower voltage levels (UDC, 0) of the intermediate voltage circuit, the voltage levels showing a difference in potential (UDC). The method includes generating a first reference voltage (Uref1) and a second reference voltage (Uref2); scaling the phase output voltage by the scaling coefficient (k); comparing the low-pass filtered phase output voltage with the first reference voltage (Uref1); detecting a time instant (t1) when the low-pass filtered phase output voltage exceeds the first reference voltage (Uref1); comparing the low-pass filtered phase output voltage with the second reference voltage (Uref2); detecting a time instant (t2) when the low-pass filtered phase output voltage is lower than the second reference voltage (Uref2); and calculating the effective time of the voltage pulse on the basis of the time between the first and the second time instants and a constant term.
REFERENCES:
patent: 4547719 (1985-10-01), Sakamoto et al.
patent: 5045800 (1991-09-01), Kung
patent: 6288595 (2001-09-01), Hirakata et al.
patent: 2001/0050540 (2001-12-01), Takayama et al.
patent: 02307369 (1990-12-01), None
patent: 05103473 (1993-04-01), None
patent: 09 154294 (1997-06-01), None
patent: 10075586 (1998-03-01), None
patent: 2004 173360 (2004-06-01), None
Frede Blaabjerg, Improved Modulation Techniques for PWM—VSI Drives, IEEE Transactions on Industrial Electronics, Feb. 1997, pp. 87-95, vol. 44, No. 1.
Finnish Search Report.
ABB Oy
Buchanan & Ingersoll & Rooney PC
Ruiz Johali A Torres
Vu Bao Q.
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