Smoothing circuit employing charging circuit intermittently charging when input voltage is higher relatively than terminal voltage and discharging circuit intermittently releasing discharging current when terminal voltage is higher relatively than input voltage
First Claim
Patent Images
1. A smoothing circuit comprising:
- a capacitor;
a voltage comparator which compares a terminal voltage of said capacitor and an input voltage;
a charging circuit which intermittently charges said capacitor when said input voltage is higher relatively than said terminal voltage; and
a discharging circuit which intermittently releases a discharging current from said capacitor when said terminal voltage is lower higher relatively than said input voltage,wherein said charging circuit comprises a current supply section which supplies a predetermined charging current to said capacitor, and a first timing control section which controls the timing of the operation to intermittently supply the charging current by said current supply section.
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Abstract
A smoothing circuit for realizing the miniaturization and the increase of integration scale of a circuit and for easily varying attack time and release time. This smoothing circuit comprises a capacitor, voltage comparator, charging circuit, and discharging circuit. The voltage comparator compares the terminal voltage of the capacitor with its input voltage and actuates the charging circuit or the discharging circuit according to a comparison result. The charging circuit charges the capacitor by intermittently supplying charging current. The discharging circuit discharges the capacitor by allowing discharging current to flow intermittently.
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Citations
15 Claims
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1. A smoothing circuit comprising:
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a capacitor; a voltage comparator which compares a terminal voltage of said capacitor and an input voltage; a charging circuit which intermittently charges said capacitor when said input voltage is higher relatively than said terminal voltage; and a discharging circuit which intermittently releases a discharging current from said capacitor when said terminal voltage is lower higher relatively than said input voltage, wherein said charging circuit comprises a current supply section which supplies a predetermined charging current to said capacitor, and a first timing control section which controls the timing of the operation to intermittently supply the charging current by said current supply section. - View Dependent Claims (2, 3, 4)
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5. A smoothing circuit comprising:
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a capacitor; a voltage comparator which compares a terminal voltage of said capacitor and an input voltage; a charging circuit which intermittently charges said capacitor when said input voltage is higher relatively than said terminal voltage; and a discharging circuit which intermittently releases a discharging current from said capacitor when said terminal voltage is lower higher relatively than said input voltage, wherein said discharging circuit comprises a current release section which releases the predetermined discharging current from said capacitor, and a second timing control section which controls the timing of the operation to intermittently release the discharging current by said current release section. - View Dependent Claims (6, 7, 8)
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9. A smoothing circuit comprising:
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a capacitor; a voltage comparator which compares a terminal voltage of said capacitor and an input voltages; a charging circuit which intermittently charges said capacitor when said input voltage is higher relatively than said terminal voltage; and a discharging circuit which intermittently releases a discharging current from said capacitor when said terminal voltage is lower higher relatively than said input voltage, wherein said charging circuit comprises a current supply section which supplies a predetermined charging current to said capacitor, and a first timing control section which controls the timing of the operation to intermittently supply the charging current by said current supply section; said discharging circuit comprises a current release section which releases the predetermined discharging current from said capacitor, and a second timing control section which controls the timing of the operation to intermittently release the discharging current by said current release section; and the timing of supply of the charging current controlled by said first timing control section and the timing of discharging by the discharging current controlled by said second timing control section do not overlap each other.
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10. A smoothing circuit comprising:
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a capacitor; a voltage comparator which compares a terminal voltage of said capacitor and an input voltage; a charging circuit which intermittently charges said capacitor when said input voltage is higher relatively than said terminal voltage; and a discharging circuit which intermittently releases a discharging current from said capacitor when said terminal voltage is lower relatively than said input voltage, further comprising charging/discharging speed setting unit for setting the speed of charging by said charging circuit and the speed of discharging by said discharging circuit to different values. - View Dependent Claims (11, 12, 13, 14, 15)
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Specification