A control unit for a food waste disposer has a controller that determines operational status of the food waste disposer based on motor loading of an induction motor of the food waste disposer.

A method and a system for determining a phase shift between a phase current and a phase voltage in an AC phase line of a converter. A method and a system for determining a phase shift between a phase current (I.sub.u, I.sub.v, I.sub.w) and a phase voltage (U.sub.u, U.sub.v, U.sub.w) in an AC phase line (U, V, W) of a converter (5), in particular a converter (5) of a system for inductive power transfer, wherein a phase current change dependent quantity is determined, wherein a voltage-specific reference time point is determined depending on the phase current change dependent quantity, wherein the phase current (I.sub.u, I.sub.v, I.sub.w) is determined, wherein a current-specific reference time point is determined depending on the phase current (I.sub.u, I.sub.v, I.sub.w), wherein the phase shift is determined depending on the time difference between the voltage-specific reference time point and the current-specific reference time point.

Techniques for estimating a phase relation between a first binary signal and a second binary signal, in particular to a clock-to-data phase detection in double-data-rate signals. The binary signals may include both rising and falling signal edges. Techniques may include determining a first and second signal edge for the first binary signal and comparing the signal edges of the first binary signal to one or more signal edges of the second binary signal, then performing one or more calculations based on the comparisons. The phase relation between the first binary signal and the second binary signal may be determined based on the one or more calculations.

A timing difference detection circuit includes a first channel, a second channel, a third channel, a waveform conversion unit, a sampling unit and a comparison unit. The first channel to the third channel generate three signals according to a first reference signal. The waveform conversion unit generates three control signals according to the three signals. The sampling unit samples a second reference signal according to the three control signals to generate three sampling signals. The comparison unit generates three comparison signals according to the three sampling signals. A phase difference between the first channel and the second channel is calculated according to the three comparison signals.

A control unit for a food waste disposer has a controller that determines operational status of the food waste disposer based on motor loading of an induction motor of the food waste disposer.

The subject matter of this specification can be embodied in, among other things, an apparatus having a housing, a first electrical input port, a second electrical input port, at least one trigger output port, and a synchronization check relay arranged at least partly within the housing and in electrical communication with the first electrical input port, the second electrical input ports, and the at least one trigger output port.

The invention involves a multimeter with a meter probe module and phasing probe module capable of wireless communication, proximity measurements, and accurately reading phase degrees. The meter probe module and the phasing probe module can communicate wirelessly, via a wired cable interface, or any combination thereof. The meter probe module and phasing probe module have unique radio frequency serial numbers that allow the probe modules to only communicate with its paired partner probe module while ignoring all other probe modules. The multimeter has a measurement point capable of taking direct contact measurements. The multimeter also has a measurement point capable of taking a voltage measurement without directly contacting the object to be measured. This is accomplished by taking voltage readings from the electric field of the air surrounding said object. The improved multimeter may allow an operator to more safely gather accurate information about an object being measured.

Methods and systems are disclosed for determining active and/or reactive power flows in a distribution line of a distribution network. The determined power flows may be linear in nature, and they may further be used to determine an overall network power flow for the distribution network. Further, the network power flow can be used to determine a voltage magnitude for any distribution bus in the distribution network. The methods and systems are capable of considering a plurality of sensitivity factors that may affect one or more distribution buses.

The present invention belongs to the technical field of aviation electrics and electric power, and provides an aircraft grid phase angle tracker based on nonlinear active disturbance rejection, which is used to estimate the grid phase angle on AC side of an aircraft grid. A embedded generator in the aircraft grid is arranged inside a compressor of an aviation gas turbine engine, and the embedded generator is directly coupled with the aviation gas turbine engine so that the AC frequency of the embedded generator varies with the speed of the aviation gas turbine engine. The present invention applies the nonlinear active disturbance rejection technology to the phase angle tracking of the more electric aircraft grid, is simple in operation and high in accuracy, and can realize high-accuracy tracking of the grid phase angle. The method has certain extensibility and can be extended to other fields.

A method, system, and computer program product for detecting and monitoring a signal is provided. The method includes detecting an alignment point for a periodic signal segment of a periodic signal generated by an apparatus being monitored for standard functionality In response, the apparatus is activated from a period prior to the alignment point to an end point of the periodic signal segment and a first point of the periodic signal segment is located. Likewise, a second point of an additional periodic signal segment of the periodic signal is located. The periodic signal is normalized based on results of locating the first point and the second point.