Electricity: power supply or regulation systems – Self-regulating – Using a three or more terminal semiconductive device as the...
Reexamination Certificate
2007-07-17
2007-07-17
Patel, Rajnikant B. (Department: 2838)
Electricity: power supply or regulation systems
Self-regulating
Using a three or more terminal semiconductive device as the...
C323S314000, C324S1540PB
Reexamination Certificate
active
11100407
ABSTRACT:
In a driver circuit constructing a switching power supply device that switches power transistors passing a current through a coil by a PWM mode, a current detection transistor, which is smaller in size than the low-potential side power transistor and a current detection resistor are provided in parallel to the low-potential side power transistor. The same control voltage as the power transistor is applied to the control terminal of the current detection transistor. An operational amplifier is formed, that has the potential of the connection node between the current detection transistor and the current detection resistor applied to its inverse input terminal and a feedback loop, so as to make a pair of input terminals of the operational amplifier be at the same potential. A signal produced by the current detection resistor is thus outputted as a current detection signal.
REFERENCES:
patent: 4553084 (1985-11-01), Wrathall
patent: 5982160 (1999-11-01), Walters et al.
patent: 6534960 (2003-03-01), Wells et al.
patent: 4093188 (1992-03-01), None
patent: 6180332 (1994-06-01), None
Chiba Shin
Hosokawa Kyoichi
Kudo Ryotaro
Nagasawa Toshio
Tateno Koji
Mattingly ,Stanger ,Malur & Brundidge, P.C.
Patel Rajnikant B.
Renesas Technology Corp.
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