Bridge type phase detection device

Details Bridge type phase detection device Bridge type phase detection device

2006-09-19

2006-09-19

Benson, Walter (Department: 2858)

Electricity: measuring and testing

Impedance, admittance or other quantities representative of...

With auxiliary means to condition stimulus/response signals

C324S701000

Reexamination Certificate

active

07109723

ABSTRACT:
A bridge type phase detection device comprises one or more than one transformer, a plurality of tubes, a voltage-detecting protection circuit and a first, second and third impedance, wherein a first tube of said plurality of tubes has a phase opposite to that of a second tube of said plurality of tubes, and a first end of said first impedance coupling with a secondary side of said transformer and a first end of said first tube, a first end of said second impedance coupling with said secondary side of said transformer and a first end of said second tube, then a second end of said first impedance connecting to a second end of said second impedance to form a detection point, said detection point coupling with said third impedance and said voltage-detecting protection circuit; said detection point having a voltage value derived from calculating a sum of said phase of said first impedance and that of said second impedance, then an output voltage divided among said first, two and third impedance, resulting in approximately zero voltage at said detection point during normal operation, if said voltage-detecting protection circuit detecting a non-zero voltage, it is concluded that a tube anomaly is present.

REFERENCES:
patent: 4798988 (1989-01-01), Mitsutsuka
patent: 6494587 (2002-12-01), Shaw et al.
patent: 6636190 (2003-10-01), Hirakata et al.

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