Converting available electrical power to desirable...

Details Converting available electrical power to desirable... Converting available electrical power to desirable...

2000-10-20

2001-06-05

Han, Jessica (Department: 2838)

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

C323S225000, C323S284000, C323S299000

Reexamination Certificate

active

06242896

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates generally to electrical power and, more specifically, to converting available power to desirable power.
BACKGROUND OF THE INVENTION
Electrical power supplies are widely used in daily activities. Each of a refrigerator, a television, a VCR, a computer, a computer peripheral, etc., requires electrical power supplies. Depending on the needs of each of these appliances, the consumed power varies in different modes of operation. For example, a computer in a “power saved” mode or a camcorder in a “standby” mode does not draw as much current as in an operational mode. Similarly, a computer disk drive generally demands a current higher than normal to spin up its motor in a startup mode. To properly manage the power, many approaches require that an operating system include information and intelligence to determine the startup time so that the system power may then be rationed to other devices and thus reserved for the disk drive. Such approaches may also require an additional power supply to be used when the high power is needed. However, a power management system both by itself and with additional power supplies is costly and adds undesirable complexity to the system. Consequently, it is clearly desirable that mechanisms be provided to solve the above deficiencies.
SUMMARY OF THE INVENTION
Techniques are disclosed for converting available electrical power to desirable electrical power. One embodiment of the techniques calls for a boost circuit to convert low input power W
in
at a terminal T
Vin
to high output power W
out
at a terminal T
Vout
. Those skilled in the art will recognize that the electrical power at a terminal is the product of the voltage and the current at that same terminal. The boost circuit comprises a voltage generation circuit, a capacitor C
store
, a timing-control generator, and a boost regulator. The voltage generation circuit converts voltage V
in
at terminal T
Vin
to voltage V
store
at a terminal T
Vstore
wherein, in one embodiment, V
store
is less than V
in
. Further, the current I
charge
provided by the voltage generation circuit at terminal T
Vstore
is less than the input current I
in
available at terminal T
Vin
. In one embodiment, capacitor C
store
, being charged by current I
charge
, stores necessary charge to provide appropriate currents and voltages to the boost regulator.
The timing-control generator uses voltages V
in
and V
store
to provide a timing-control signal T
control
, which controls the timing operation of the boost regulator. In one embodiment, T
control
sets and resets the boost regulator. Resetting the boost regulator prevents it from performing its operation while setting it allows its normal function. In one embodiment, T
control
resets the boost regulator until capacitor C
store
accumulates enough charge to provide appropriate power to the load at terminal T
Vout
. The boost regulator, when in operation, converts voltage V
store
to voltage V
out
. In one embodiment, the boost circuit converts V
in
at 3.3V and I
in
at 1.2A to V
out
at 5.0V and I
out
at 2.A, for a predefined period.


REFERENCES:
patent: 4631470 (1986-12-01), Bingley
patent: 5929615 (1999-07-01), D'Angelo et al.

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