Fan system and power monitoring apparatus thereof

Details Fan system and power monitoring apparatus thereof Fan system and power monitoring apparatus thereof

2007-03-15

2010-02-23

Benson, Walter (Department: 2837)

Electricity: motive power systems

Induction motor systems

Primary circuit control

C318S599000, C318S811000, C318S059000

Reexamination Certificate

active

07667428

ABSTRACT:
A power monitoring apparatus for receiving an external input signal includes a first modulating unit, a second modulating unit and a comparing unit. The first modulating unit receives and modulates an input signal into a first signal. The second modulating unit receives and modulates the input signal into a second signal. The comparing unit is electrically connected with the first modulating unit and the second modulating unit and has a first input terminal, a second input terminal and an output terminal. The first input terminal receives the first signal and the second input terminal receives the second signal. When a difference between the first signal and the second signal is higher or lower than a predetermined range, the output terminal outputs a control signal.

REFERENCES:
patent: 5777897 (1998-07-01), Giorgio
patent: 6368064 (2002-04-01), Bendikas et al.
patent: 2005/0007041 (2005-01-01), Liu

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