Power supply devices and control method thereof
First Claim
1. A power supply device for providing a maintenance voltage at an output terminal to a system chip of a system comprising:
- a first battery for providing a battery voltage;
a capacitor for storing a capacitor voltage;
a charging circuit coupled to the capacitor; and
a monitoring circuit for detecting the battery voltage and the capacitor voltage,wherein the monitoring circuit detects whether the battery voltage is less than a first threshold and whether the capacitor voltage is larger than a second threshold and generates a control signal according to the determination result, andwherein when the monitoring circuit detects that the battery voltage is less than the first threshold and the capacitor voltage is not larger than the second threshold, the monitoring circuit asserts the control signal to control the charging circuit to charge the capacitor;
wherein when the monitoring circuit detects that the battery voltage is less than the first threshold and the capacitor voltage is larger than the second threshold, the monitoring circuit de-asserts the control signal to control the charging circuit not to charge the capacitor.
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Accused Products
Abstract
A power supply device is provided. The power supply device provides a maintenance voltage at an output terminal to a system chip of a system and includes a first battery, a capacitor, a charging circuit, and a monitoring circuit. The first battery provides a battery voltage. The capacitor stores a capacitor voltage. The charging circuit is coupled to the capacitor. The monitoring circuit detects whether the battery voltage is less than a first threshold and whether the capacitor voltage is larger than a second threshold and generates a control signal according to the determination result. When the monitoring circuit detects that the battery voltage is less than the first threshold and the capacitor voltage is not larger than the second threshold, the monitoring circuit asserts the control signal to control the charging circuit to charge the capacitor.
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Citations
22 Claims
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1. A power supply device for providing a maintenance voltage at an output terminal to a system chip of a system comprising:
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a first battery for providing a battery voltage; a capacitor for storing a capacitor voltage; a charging circuit coupled to the capacitor; and a monitoring circuit for detecting the battery voltage and the capacitor voltage, wherein the monitoring circuit detects whether the battery voltage is less than a first threshold and whether the capacitor voltage is larger than a second threshold and generates a control signal according to the determination result, and wherein when the monitoring circuit detects that the battery voltage is less than the first threshold and the capacitor voltage is not larger than the second threshold, the monitoring circuit asserts the control signal to control the charging circuit to charge the capacitor; wherein when the monitoring circuit detects that the battery voltage is less than the first threshold and the capacitor voltage is larger than the second threshold, the monitoring circuit de-asserts the control signal to control the charging circuit not to charge the capacitor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 21, 22)
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19. A control method for a power supply device, wherein the power supply device provides a maintenance voltage to a system chip of a system and comprises a first battery and a capacitor, the control method comprises:
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determining whether a battery voltage of the first battery is less than a first threshold when the system is at an operation state; when the battery voltage is less than the first threshold, determining whether a capacitor voltage of the capacitor is larger than a second threshold; when the capacitor voltage is not larger than the second threshold, charging the capacitor, so that the capacitor voltage becomes larger than the second threshold; when the capacitor voltage is larger than the second threshold, switching the system to be at an inaction state; and at the inaction state, providing the capacitor voltage which is larger than the second threshold to serve as the maintenance voltage and replacing the first battery with a second battery. - View Dependent Claims (20)
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Specification