Batteries: thermoelectric and photoelectric – Applications – Circuits
Reexamination Certificate
2002-11-09
2004-10-05
Diamond, Alan (Department: 1753)
Batteries: thermoelectric and photoelectric
Applications
Circuits
C136S244000, C307S127000, C307S051000, C307S116000, C361S082000, C361S084000, C320S101000, C323S906000, C323S221000
Reexamination Certificate
active
06800802
ABSTRACT:
FIELD OF THE INVENTION
This invention relates generally to a circuit device, particularly to an improved circuit device for solar energy application, in which a MOSFET (Metal-oxide-semiconductor-field-effect-transistor) is adopted to serve for a current-blocking device.
BACKGROUND OF THE INVENTION
FIG. 1
shows am embodiment of a current-blocking device in mechanical style, in which the current of a rechargeable cell pack
20
could be prevented from flowing back to a solar panel
10
when a switch
30
is switched “OFF” manipulatively. However, charging of the cell pack
20
can not be made automatically. It can be done only when the switch
30
is switched “ON” by hand.
Similarly, a diode
40
shown in
FIG. 2
is another example for blocking current, in which the current of the cell pack
20
is prohibited from flowing back to the solar panel
10
through the diode
40
. However, the solar panel
10
might not be able to transfer full energy to the cell pack
20
because of the considerable energy consumption of this diode
40
.
In view of the above drawbacks in the conventional current blocking devices this invention is intended to propose an improved current-blocking device working between the rechargeable cell pack and the solar panel with infinitesimal power consumption.
SUMMARY OF THE INVENTION
The primary objective of this invention is to provide a current-blocking device between a solar panel and a rechargeable cell pack to serve for a current choker with little power consumption.
In order to achieve the above goal, an improved circuit device for solar energy application of this invention is comprised of a solar panel as power supply and a rechargeable cell pack for receiving the power transferred from that solar panel. Such an architecture has the characteristics that the Drain and the Source of a MOSFET are conductively connected with the solar panel and the cell pack respectively so that the body diode of the MOSFET Is forward interposed between the solar panel and the cell pack for prevention of a reverse current when charging is stopped.
For more detailed information regarding advantages or features of this invention, at least an example of preferred embodiment will be fully described below with reference to the annexed drawings.
REFERENCES:
patent: 5500055 (1996-03-01), Toyama et al.
patent: 5714869 (1998-02-01), Tamechika et al.
patent: 5726505 (1998-03-01), Yamada et al.
patent: 6014077 (2000-01-01), Beaumont et al.
patent: 2001/0004198 (2001-06-01), Matsuyama
patent: 2004/0051145 (2004-03-01), Nobe et al.
patent: 891038 (1999-01-01), None
patent: 8-84442 (1996-03-01), None
Diamond Alan
Novaest Optitronix Inc.
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