Reset signal generation circuit
AssigneeMitsumi Electric Co., Ltd.
InventorHiroshi Nagaoka
Life of this patent
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Abstract
When a voltage of a voltage source increases higher than a predetermined value, a reset signal generation circuit generates a power-on reset signal for a battery charger. In the reset signal generation circuit, power for an output circuit is supplied from a divided point between a voltage source and a ground, which power is stabilized by a voltage stabilizer circuit. Since the power for the output circuit is supplied from the divided point, a fluctuation of the voltage of the power for the output circuit is reduced compared to that of the voltage source. Moreover, the voltage stabilizer circuit prevents an erroneous reset signal for the battery charger from being generated due to the voltage fluctuation of the voltage source.
Claims6
A reset signal generation circuit which generates a power-on reset signal when a voltage of a voltage source has increased higher than a predetermined value, the reset signal generation circuit comprising:
- a power-on reset signal output circuit which is supplied with power from a divided point between said voltage source and a ground;
- and
- a voltage stabilizer which stabilizes a voltage of said divided point comprises;
- a capacitor;
- a first element which turns on when said voltage of said divided point decrease lower than a charged voltage of said capacitor and carries a current from said capacitor to said divided point;
- and
- a second element which turns on when said voltage of said divided point increases higher than said charged voltage of said capacitor and carries a current from said divided point to said capacitor.
A reset signal generation circuit which generates a power-on reset signal when a voltage of a voltage source has increased higher than a predetermined value, the reset signal generation circuit comprising:
- first means, which is supplied with power from a divided point between said voltage source and a ground, for outputting the power-on reset signal;
- and
- second means for stabilizing a voltage of said divided point comprises:
- a capacitor;
- a first element which turns on when said voltage of said divided point decreases lower than a charged voltage of said capacitor and carries a current from said capacitor to said divided point;
- and
- a second element which turns on when said voltage of said divided point increases higher than said charged voltage of said capacitor and carries a current from said divided point to said capacitor.
Dependencies are inferred from the claim text.