Zero crossing indicator device
AssigneeSigma Designs Israel S.D.I. Ltd.
InventorsDanny BRAUNSHTEIN, Alex AKSELROD
Life of this patent
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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.
Claims26
An alternating current (AC) zero-crossing indicator apparatus comprising:
- a current adjusting circuit for adjusting a DC signal current for a duration of time at least the same as the duration of a received zero-crossing detection signal;
- a voltage retainer for maintaining a substantially constant DC voltage applied to a connected load during the adjusting of the DC signal current;
- and
- a zero-crossing sensor for generating a zero-crossing indication signal responsive to sensing of the adjusting of the DC signal current.
A method for indicating an alternating current (AC) zero-crossing comprising:
- detecting a change in polarity in an AC signal current;
- generating a zero-crossing detection signal responsive to said detecting;
- adjusting a DC signal current for a duration of time of at least a duration of said zero-crossing detection signal;
- sensing said adjusting;
- and
- generating a zero-crossing indication signal responsive to said sensing.
A direct current (DC) power supply for supplying a DC current to a powerline communication (PLC) device comprising:
- an AC/DC converter to convert an AC signal current to DC signal current;
- an AC zero-crossing detector for generating a zero-crossing detection signal upon detecting a change of polarity in the AC signal;
- and
- a current adjusting circuit for adjusting the DC signal current for a duration of time at least the same as the duration of a received zero-crossing detection signal.
A powerline communication (PLC) device comprising:
- a voltage retainer for maintaining a substantially constant DC voltage applied during an adjusting of an input DC signal current to the PLC device;
- and
- a zero-crossing sensor for generating a zero-crossing indication signal responsive to sensing of the adjusting of said input DC signal current.
Dependencies are inferred from the claim text.