Phase sequence indicator circuit
AssigneeLeviton Manufacturing Co., Inc.
InventorsJohn Garbarino, Constantin Diac
Life of this patent
Estimating the term…
Abstract
A phase sequence indicator circuit includes first, second, and third phase inputs to receive first, second, and third alternating current (AC) phases of an input multiphase AC voltage. The phase sequence indicator circuit further includes a sequence detection circuit that includes phase sequence detection circuits. Each phase sequence detection circuit determines an order of the AC phases based on timing of one of the AC phases, and outputs a respective sequence indication signal. The phase sequence indicator circuit also includes an output circuit to determine whether the output sequence indication signals indicate a selected phase sequence for the input multiphase AC voltage.
Claims25
A phase sequence indicator circuit comprising:
- a first phase input, a second phase input, and a third phase input to receive a first alternating current (AC) phase, a second AC phase, and a third AC phase, respectively, of an input multiphase AC voltage;
- a sequence detection circuit comprising:
- a first phase sequence detection circuit to determine an order of the second AC phase and the third AC phase based on timing of the first AC phase, and to output a first sequence indication signal;
- a second phase sequence detection circuit to determine an order of the first AC phase and the third AC phase based on timing of the second AC phase, and to output a second sequence indication signal;
- and
- a third phase sequence detection circuit to determine an order of the first AC phase and the second AC phase based on timing of the third AC phase, and to output a third sequence indication signal;
- and
- an output circuit to determine whether the first sequence indication signal, the second sequence indication signal, and the third sequence indication signal, indicate a selected phase sequence for the input multiphase AC voltage.
A method for indicating a phase sequence for an input multiphase alternating current (AC) voltage, the method comprising:
- receiving a first AC phase, a second AC phase, and a third AC phase of the input multiphase AC voltage;
- determining, by a first phase sequence detection circuit, an order of the second AC phase and the third AC phase based on timing of the first AC phase, and outputting a first sequence indication signal;
- determining, by a second phase sequence detection circuit, an order of the first AC phase and the third AC phase based on timing of the second AC phase, and outputting a second sequence indication signal;
- determining, by a third phase sequence detection circuit, an order of the first AC phase and the second AC phase based on timing of the third AC phase, and outputting a third sequence indication signal;
- and
- determining whether the first sequence indication signal, the second sequence indication signal, and the third sequence indication signal indicate a selected phase sequence for the input multiphase AC voltage.
A wiring device comprising:
- a phase sequence indicator circuit comprising:
- a first phase input, a second phase input, and a third phase input to receive a first alternating current (AC) phase, a second AC phase, and a third AC phase, respectively, of an input multiphase AC voltage;
- a sequence detection circuit comprising:
- a first phase sequence detection circuit to determine an order of the second AC phase and the third AC phase based on timing of the first AC phase, and to output a first sequence indication signal;
- a second phase sequence detection circuit to determine an order of the first AC phase and the third AC phase based on timing of the second AC phase, and to output a second sequence indication signal;
- and
- a third phase sequence detection circuit to determine an order of the first AC phase and the second AC phase based on timing of the third AC phase, and to output a third sequence indication signal;
- and
- an output circuit to determine whether the first sequence indication signal, the second sequence indication signal, and the third sequence indication signal, indicate a selected phase sequence for the input multiphase AC voltage.
Dependencies are inferred from the claim text.