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;
a voltage regulator having an input coupled to the output of the step-up voltage converter, the voltage regulator having an activated state, in which a low supply voltage is produced at an output of the voltage regulator that is coupled to the low voltage circuit, and a deactivated state, in which the low supply voltage is not produced at the output of the voltage regulator;
a first diode including an anode side coupled to the battery voltage and a cathode side coupled to the low voltage circuit;
a bypass circuit having an input coupled to the anode side of the first diode and an output coupled to the cathode side of the first diode, wherein power is delivered to the low voltage circuit through the bypass circuit when the bypass circuit is activated and power is blocked from being delivered to the low voltage circuit through the bypass circuit when the bypass circuit is deactivated; and
a controller selectively couples the low voltage circuit to one of the output from the step-up voltage converter and the battery voltage, deactivates the bypass circuit when the voltage regulator is activated and activates the bypass circuit when the voltage regulator is deactivated.
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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.
987 Citations
18 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; a voltage regulator having an input coupled to the output of the step-up voltage converter, the voltage regulator having an activated state, in which a low supply voltage is produced at an output of the voltage regulator that is coupled to the low voltage circuit, and a deactivated state, in which the low supply voltage is not produced at the output of the voltage regulator; a first diode including an anode side coupled to the battery voltage and a cathode side coupled to the low voltage circuit; a bypass circuit having an input coupled to the anode side of the first diode and an output coupled to the cathode side of the first diode, wherein power is delivered to the low voltage circuit through the bypass circuit when the bypass circuit is activated and power is blocked from being delivered to the low voltage circuit through the bypass circuit when the bypass circuit is deactivated; and a controller selectively couples the low voltage circuit to one of the output from the step-up voltage converter and the battery voltage, deactivates the bypass circuit when the voltage regulator is activated and activates the bypass circuit when the voltage regulator is deactivated. - View Dependent Claims (2, 3, 4, 5, 6)
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7. 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 (8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. 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, a high voltage circuit powered by a high voltage holding capacitor and a step-up voltage converter, the method comprising:
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charging the high voltage holding capacitor using the battery voltage and the step-up voltage converter; 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 (18)
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Specification