POWERING DEVICES HAVING LOW AND HIGH VOLTAGE CIRCUITS
First Claim
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1. A device comprising:
- a battery having an output of a battery voltage;
a step-up voltage converter having an input coupled to the battery voltage and configured to produce a high supply voltage at an output;
a high voltage circuit coupled to the output of the step-up voltage converter;
a low voltage circuit; and
a controller selectively powering the low voltage circuit using one of the output from the step-up voltage converter and the battery voltage.
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Abstract
Embodiments of the invention are directed to a device that includes a battery having an output of a battery voltage, a step-up voltage converter, a high voltage circuit, a low voltage circuit and a controller. The step-up voltage converter includes an input that is coupled to the battery voltage. The step-up voltage converter is configured to produce a high supply voltage at an output. The high voltage circuit is coupled to the output of the step-up voltage converter. The controller selectively powers the low voltage circuit using either the output from the step-up voltage converter or the battery voltage.
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Citations
20 Claims
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1. A device comprising:
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a battery having an output of a battery voltage; a step-up voltage converter having an input coupled to the battery voltage and configured to produce a high supply voltage at an output; a high voltage circuit coupled to the output of the step-up voltage converter; a low voltage circuit; and a controller selectively powering the low voltage circuit using one of the output from the step-up voltage converter and the battery voltage. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A device comprising:
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a battery having an output of a battery voltage; a high voltage circuit powered by a high voltage holding capacitor; a step-up voltage converter having an input coupled to the battery voltage, the step-up voltage converter having an activated state, in which the step-up voltage converter charges the high voltage holding capacitor; a low voltage holding capacitor powered by the battery voltage when the battery voltage exceeds a threshold value, the low voltage holding capacitor powered by the voltage on the high voltage holding capacitor when the battery voltage drops below the threshold value during charging of the high voltage holding capacitor by the step-up voltage converter; and a low voltage circuit powered by the low voltage holding capacitor. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A method of operating a device powered by a battery, which produces a battery voltage, the device comprising a low voltage circuit powered by a low voltage holding capacitor and a high voltage circuit powered by a high voltage holding capacitor, the method comprising:
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charging the high voltage holding capacitor using the battery voltage; charging the low voltage holding capacitor using the battery voltage when the battery voltage exceeds a threshold value; and charging the low voltage holding capacitor using the voltage on the high voltage holding capacitor when the battery voltage falls below the threshold value. - View Dependent Claims (20)
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Specification