Electricity: motive power systems – Braking – Automatic and/or with time-delay means
Reexamination Certificate
2006-04-04
2006-04-04
Masih, Karen (Department: 2837)
Electricity: motive power systems
Braking
Automatic and/or with time-delay means
C318S599000, C318S801000, C318S685000, C318S696000
Reexamination Certificate
active
07023157
ABSTRACT:
The reference signal generation unit110aintegrates, in the integration circuit3, a staircase signal generated by the staircase generation unit2, and thereby generates a reference signal VCTA whose signal level changes continuously over time, and which represents a limit value for the supply current. According to the control of the PWM control unit120a, the bridge rectification circuit130amaintains the coil supply current at the limit value, using a current chopper method. Additionally, when the current supply is stopped, the bridge rectification circuit130aperforms synchronous rectification, where the transistors10and12are brought into conduction, and a regenerative current is circulated in a closed circuit formed with the coil19a. When the reference signal VCTA decreases relatively fast, the synchronous rectification prohibition unit115aprohibits one of the transistors10and12from being brought into conduction when the current supply is stopped.
REFERENCES:
patent: 2004/0000884 (2004-01-01), Inao et al.
patent: 2004/0080333 (2004-04-01), Klein
patent: 6-343295 (1994-12-01), None
Fukamizu Shingo
Onishi Katsuhiro
Masih Karen
Matsushita Electric - Industrial Co., Ltd.
McDermott Will & Emery LLP
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