Voltage quadrupler comprising a second charging capacitor charged using a first charging capacitor
First Claim
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1. A voltage booster comprising:
- an input for receiving an input voltage Vin;
a first charging capacitor C1;
a second charging capacitor C2;
an output capacitor Cout; and
control circuitry operable to charge the output capacitor Cout to four times Vin by;
connecting C1 in parallel with Vin to charge C1 to Vin;
after charging C1 to Vin, connecting C2 in parallel with Vin plus C1 to charge C2 to twice Vin;
after charging C2 to twice Vin, connecting C1 in parallel with Vin to recharge C1 to Vin; and
after recharging C1, connecting Cout in parallel with Vin plus C1 plus C2 to charge Cout to four times Vin.
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Abstract
A voltage booster is disclosed comprising an input for receiving an input voltage Vin, a first charging capacitor C1, a second charging capacitor C2, and an output capacitor Cout. The output capacitor Cout is charged to four times Vin by connecting C1 in parallel with Vin to charge C1 to Vin, after charging C1 to Vin, connecting C2 in parallel with Vin plus C1 to charge C2 to twice Vin, after charging C2 to twice Vin, connecting C1 in parallel with Vin to recharge C1 to Vin, and after recharging C1, connecting Cout in parallel with Vin plus C1 plus C2 to charge Cout to four times Vin.
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Citations
22 Claims
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1. A voltage booster comprising:
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an input for receiving an input voltage Vin; a first charging capacitor C1; a second charging capacitor C2; an output capacitor Cout; and control circuitry operable to charge the output capacitor Cout to four times Vin by; connecting C1 in parallel with Vin to charge C1 to Vin; after charging C1 to Vin, connecting C2 in parallel with Vin plus C1 to charge C2 to twice Vin; after charging C2 to twice Vin, connecting C1 in parallel with Vin to recharge C1 to Vin; and after recharging C1, connecting Cout in parallel with Vin plus C1 plus C2 to charge Cout to four times Vin. - View Dependent Claims (2, 3, 4)
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5. A disk drive comprising:
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a disk; a head actuated over the disk; and a voltage booster configurable into a first mode to boost a supply voltage (SV) by N and configurable into a second mode to boost a backup voltage (BV) by M greater than N; and control circuitry operable to; configure the voltage booster into the first mode during normal operation; and configure the voltage booster into the second mode during a power failure. - View Dependent Claims (6, 7, 8, 9, 10, 11)
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12. A method of operating a voltage booster, the voltage booster comprising an input for receiving an input voltage Vin, a first charging capacitor C1, a second charging capacitor C2, and an output capacitor Cout, the method comprising charging the output capacitor Cout to four times Vin by:
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connecting C1 in parallel with Vin to charge C1 to Vin; after charging C1 to Vin, connecting C2 in parallel with Vin plus C1 to charge C2 to twice Vin; after charging C2 to twice Vin, connecting C1 in parallel with Vin to recharge C1 to Vin; and after recharging C1, connecting Cout in parallel with Vin plus C1 plus C2 to charge Cout to four times Vin. - View Dependent Claims (13, 14, 15)
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16. A method of operating a disk drive comprising, the disk drive comprising a disk, a head actuated over the disk, and a voltage booster configurable into a first mode to boost a supply voltage (SV) by N and configurable into a second mode to boost a backup voltage (BV) by M greater than N, the method comprising:
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configuring the voltage booster into the first mode during normal operation; and configuring the voltage booster into the second mode during a power failure. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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Specification