Abstract: An alternating current (AC) zero-crossing indicator apparatus including a current adjusting circuit for adjusting a DC signal current for a duration of time the same as the duration of a received zero-crossing detection signal. The zero-crossing indicator apparatus additionally includes a voltage retainer for maintaining a constant DC voltage applied to a connected load during the adjusting of the DC signal current. Also included is a zero-crossing sensor for generating a zero-crossing indication signal responsive to sensing of the adjusting of the DC signal current.

Abstract: A zero-crossing detection circuit includes a comparator and circuitry. The comparator produces an output signal that is indicative of zero-crossing events in an input Alternating Current (AC) waveform. The circuitry may be configured to feed the comparator with first and second rails voltages, and to progressively increase the rails voltages during time intervals derived from the input AC waveform, so as to feed the comparator with target values of the rails voltages in time-proximity to the zero-crossing events. The circuitry may be configured to compensate for an error in detecting the zero crossing events caused by differences in amplitude of the input AC waveform, by correcting the input AC waveform provided to the comparator. The circuitry may be configured to activate the comparator during time intervals preceding respective anticipated times of the zero-crossing events, and to deactivate the comparator at least once during time periods other than the time intervals.

Abstract: An alternating current (AC) zero-crossing indicator apparatus including a current adjusting circuit for adjusting a DC signal current for a duration of time the same as the duration of a received zero-crossing detection signal. The zero-crossing indicator apparatus additionally includes a voltage retainer for maintaining a constant DC voltage applied to a connected load during the adjusting of the DC signal current. Also included is a zero-crossing sensor for generating a zero-crossing indication signal responsive to sensing of the adjusting of the DC signal current.

Abstract: A device that enables “smart” dimmers comprising electronic circuits beyond those found in traditional dimmers to be installed in existing houses with no need for any new electrical wires. In particular, for smart dimmers comprising PLC (power line communication) modems, the device overcomes the large attenuation imposed on power-line communication (PLC) transmissions, introduced by a load electrically connected in series with the smart dimmer, and eliminates the large noise and ringing otherwise introduced by the switching device, found in dimmers. The device enables a fair amount of sustained current to feed a smart dimmer's internal circuitry, and low PLC signal attenuation, in conjunction with undisturbed dimming functionality, with no need for any new wires.

Abstract: A device that enables “smart” dimmers comprising electronic circuits beyond those found in traditional rotary dimmers to be installed in existing houses with no need for any new electrical wires. In addition, for smart dimmers comprising PLC (power line communication) modems, the device overcomes the large attenuation imposed on power-line communication (PLC) transmissions, introduced by a lamp in series with the smart dimmer, and eliminates the large noise and ringing otherwise introduced by the switching device, inside dimmers. As opposed to prior art, that compromises either the amount of current for the electronic circuits, or the PLC attenuation or both, this disclosure overcomes both.

Abstract: A zero-crossing detection circuit includes a comparator and circuitry. The comparator produces an output signal that is indicative of zero-crossing events in an input Alternating Current (AC) waveform. The circuitry may be configured to feed the comparator with first and second rails voltages, and to progressively increase the rails voltages during time intervals derived from the input AC waveform, so as to feed the comparator with target values of the rails voltages in time-proximity to the zero-crossing events. The circuitry may be configured to compensate for an error in detecting the zero crossing events caused by differences in amplitude of the input AC waveform, by correcting the input AC waveform provided to the comparator. The circuitry may be configured to activate the comparator during time intervals preceding respective anticipated times of the zero-crossing events, and to deactivate the comparator at least once during time periods other than the time intervals.

Abstract: A device that enables “smart” dimmers comprising electronic circuits beyond those found in traditional dimmers to be installed in existing houses with no need for any new electrical wires. In particular, for smart dimmers comprising PLC (power line communication) modems, the device overcomes the large attenuation imposed on power-line communication (PLC) transmissions, introduced by a load electrically connected in series with the smart dimmer, and eliminates the large noise and ringing otherwise introduced by the switching device, found in dimmers. The device enables a fair amount of sustained current to feed a smart dimmer's internal circuitry, and low PLC signal attenuation, in conjunction with undisturbed dimming functionality, with no need for any new wires.

Abstract: A device that enables “smart” dimmers comprising electronic circuits beyond those found in traditional rotary dimmers to be installed in existing houses with no need for any new electrical wires. In addition, for smart dimmers comprising PLC (power line communication) modems, the device overcomes the large attenuation imposed on power-line communication (PLC) transmissions, introduced by a lamp in series with the smart dimmer, and eliminates the large noise and ringing otherwise introduced by the switching device, inside dimmers. As opposed to prior art, that compromises either the amount of current for the electronic circuits, or the PLC attenuation or both, this disclosure overcomes both.