Power control for a low power display
First Claim
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1. A method, comprising:
- periodically sampling, by a processing circuit, a voltage of a power storage device;
determining, by the processing circuit and at a first time, that the voltage is less than a turn on voltage; and
in response to determining that the voltage is less than the turn on voltage;
causing the power storage device to enter a charging state, the power storage device being charged by an environmental energy source while in the charging state;
periodically sampling the voltage of the power storage device while the power storage device is in the charging state, the periodic sampling having a first sampling period that is less than an amount of time required for the voltage of the power storage device to increase from a turn off voltage to a maximum rated voltage of the power storage device, the turn off voltage being a voltage at which the power storage device is transitioned out of the charging state; and
while in the charging state, causing the processing circuit to transition to a low power state between each periodic sample of the voltage.
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Abstract
A low power display device including a power control circuit for controlling power from an environmental energy source to a power storage device that is charged by the environmental energy source, is described.
25 Citations
24 Claims
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1. A method, comprising:
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periodically sampling, by a processing circuit, a voltage of a power storage device; determining, by the processing circuit and at a first time, that the voltage is less than a turn on voltage; and in response to determining that the voltage is less than the turn on voltage; causing the power storage device to enter a charging state, the power storage device being charged by an environmental energy source while in the charging state; periodically sampling the voltage of the power storage device while the power storage device is in the charging state, the periodic sampling having a first sampling period that is less than an amount of time required for the voltage of the power storage device to increase from a turn off voltage to a maximum rated voltage of the power storage device, the turn off voltage being a voltage at which the power storage device is transitioned out of the charging state; and while in the charging state, causing the processing circuit to transition to a low power state between each periodic sample of the voltage. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A power control circuit, comprising:
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a capacitor; and a processing circuit configured to; periodically sample a voltage across the capacitor; determine, at a first time, that the voltage across the capacitor is greater than a turn off voltage; and in response to determining that the voltage is greater than the turn off voltage; cause the capacitor to transition to a discharging state; periodically sample the voltage across the capacitor while the capacitor is in the discharging state, the periodic sampling having a first a sampling period that is less than an amount of time required for the capacitor to discharge from a turn on voltage to a minimum input voltage, the minimum input voltage being a voltage required for operation of a power supply drawing power from the capacitor, the turn on voltage being a voltage at which the capacitor is transitioned to a charging state; and while the capacitor is in the discharging state, transition to a low power state between each periodic sample of the voltage across the capacitor. - View Dependent Claims (8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A power control circuit, comprising:
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a capacitor; and a processing circuit configured to; periodically sample a voltage across the capacitor; determine, at a first time, that the voltage across the capacitor is less than a turn on voltage; and in response to determining that the voltage across the capacitor is less than the turn on voltage; cause the capacitor to transition to a charging state, the capacitor being charged by an environmental energy source while in the charging state; periodically sample the voltage across the capacitor while the capacitor is in the charging state, the periodic sampling having a first a sampling period that less than an amount of time required for current from the environmental energy source to charge the capacitor from a turn off voltage to a rated voltage capacity of the capacitor, the turn off voltage being a voltage at which the capacitor is transitioned out of the charging state; and while the capacitor is in the charging state, transition to a low power state between each periodic sample of the voltage across the capacitor. - View Dependent Claims (20, 21, 22, 23, 24)
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Specification