Electricity: motive power systems – Automatic and/or with time-delay means
Reexamination Certificate
2005-08-24
2009-11-10
Duda, Rina I (Department: 2837)
Electricity: motive power systems
Automatic and/or with time-delay means
C318S432000, C318S366000
Reexamination Certificate
active
07615952
ABSTRACT:
Disclosed is a motor-driving device capable of protecting an inverter from breakdown. First current-protecting section retains reference voltage value Vref1as a preset value. If the current to be fed into inverter exceeds value Vref1, first current-protecting section shuts off the output of driver and outputs a first warning to driving-signal generator to shut off generating driving signals. This protects inverter from breakdown. Second current-protection section retains reference voltage value Vref2that is smaller than value Vref1. If the detected current exceeds value Vref2, second current-protecting section outputs a second warning. Receiving the second warning, driving-signal generator immediately stops generating driving signals; however, it resumes output of driving signals after no longer receiving second warning. The structure above protects inverter from breakdown without frequent stops of brushless motor.
REFERENCES:
patent: 4897630 (1990-01-01), Nykerk
patent: 5260684 (1993-11-01), Metzmaker
patent: 2005/0241883 (2005-11-01), Zuzuly et al.
patent: 7-284289 (1995-10-01), None
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Harada Kazuhiro
Harada, legal representative Chisumi
Duda Rina I
Panasonic Corporation
Pearne & Gordon LLP
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