Abstract: A method and system for compensating for line imbalances in line commutated converters. The controller includes a phase-locked loop (PLL) synchronizing tool which receives the line to line voltage signals and generates firing angle and frequency signals used for synchronizing the two input signals. The PLL controller, in addition to the firing angle and frequency signals, also generates signals representative of filtered values of amplitudes for each of the line to line voltage signals. A voltage imbalance compensation processor associated with the bridge firing controller receives the filtered amplitude signals and also a signal representative of the firing sector of the bridge. The voltage imbalance compensation processor generates, based upon the sector signal and the received filtered amplitude signals a amplitude signal used by a current regulator which is compensated for line imbalances present in the line voltage.

Abstract: A mimic filter which can be implemented in analog or digital circuitry, and which removes dc offset or other noise from an input signal using a pseudo-differentiation technique. The input signal is adjusted by a feedback value, and the adjusted signal is amplified by a proportional gain factor to generate an output signal. The feedback value is determined by integrating the output signal and multiplying the integration by an integration gain factor. The mimic filter avoids the generation of false signal spikes.

Abstract: A method and system for tracking, over a computer network, orders placed with a supplier and shipped by any of a variety of different carriers, the tracking taking place entirely within the confines of the supplier's web site. By providing for electronic communication of delivery status information between a variety of different carriers and the supplier's server, the supplier is able to provide online tracking information to a customer regardless of the individual manner of delivery.

Abstract: A method and system for enabling commercial web site users to monitor and display a consumption forecast for an established stocking program, wherein a stocking program is an agreement between a supplier and a customer that guarantees availability and consumption of a stocking program item based upon an established consumption forecast for the item. The user can review the current consumption forecast and additional details of an established stocking program and request modification of the forecast as desired.