Electricity: power supply or regulation systems – In shunt with source or load – Using choke and switch across source
Reexamination Certificate
2000-07-07
2001-11-13
Patel, Rajnikant B. (Department: 2838)
Electricity: power supply or regulation systems
In shunt with source or load
Using choke and switch across source
C323S285000
Reexamination Certificate
active
06316921
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a power supply control system having a voltage sensor section.
2. Description of the Related Art
A voltage sensor section used in voltage control which is designed to operate at a low level of power consumption has the drawback of having a slow response speed. Therefore, in the conventional technology, it has been necessary to temporarily increase the current and quicken the response speed when high speed operation is required. As a result, it has been difficult to operate at a constantly low level of power consumption.
Accordingly, because of the operating delays in the voltage sensor section, excessive rises and falls in the voltage are generated during the startup of the circuit for causing the voltage to be abruptly increased or decreased in the voltage sensor section which operates at a constantly low level of power consumption.
SUMMARY OF THE INVENTION
It is an aim of the present invention to provide a power supply control system capable of achieving an improvement in the response speed of a voltage sensor section at low power consumption.
The aspects described below are proposed in order to achieve the above aim.
[1] The present invention is a power supply control system comprising: (a) a voltage booster circuit for boosting voltage; (b) a voltage sensor section which operates on the basis of voltage output from the voltage booster circuit; and (c) a threshold value altering circuit for lowering a threshold value of the voltage sensor section when a first level signal for operating the voltage booster circuit is output (namely, when the controlling voltage falls below the threshold value and the output from the voltage sensor section changes to “H”), and raising a threshold value of the voltage sensor section when a second level signal for halting the voltage booster circuit is output (namely, when the controlling voltage rises above the threshold value and the output from the voltage sensor section changes to “L”).
[2] In the power supply control system according to [
1
] above, the voltage sensor section performs high sensitivity operations at a low level of power consumption used in a memory LSI.
[3] A power supply control system comprising: a voltage stepdown circuit for lowering voltage; a voltage sensor section which operates on the basis of voltage output from the voltage step-down circuit; and a threshold value altering circuit for raising a threshold value of the voltage sensor section when a first level signal for operating the voltage step-down circuit is output, and lowering a threshold value of the voltage sensor section when a second level signal for halting the voltage step-down circuit is output.
[4] In the power supply control system according to [3] above, the voltage sensor section performs high sensitivity operations at a low level of power consumption used in a memory LSI.
[5] In the power supply control system according to either [1] or [3] above, a clipping circuit is connected to the voltage sensor section.
[6] A power supply control system comprising: a regulating circuit for regulating voltage; a voltage sensor section which operates on the basis of voltage output from the regulating circuit; and a threshold value altering circuit for altering the threshold value of the voltage sensor section in accordance with a plurality of level signals output to operate the regulating circuit.
REFERENCES:
patent: 5532894 (1996-07-01), Sweaton
patent: 5670865 (1997-09-01), Farwell
Kuramori Bunsho
Noguchi Mineo
OKI Electric Industry Co., Ltd.
Patel Rajnikant B.
Rabin & Berdo P.C.
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