POWER MANAGEMENT SYSTEM
First Claim
1. A power management system, comprising:
- an error amplifier, operable for comparing a first output voltage delivered to a load with a first voltage reference indicative of an operating voltage of the load and for accordingly generating a first error signal;
a DC/DC converter, coupled to a battery, that is operable for adjusting the first output voltage and a second output voltage delivered to the battery, by adjusting a duty cycle of the DC/DC converter; and
an error generator, coupled between the error amplifier and the DC/DC converter, that is operable for controlling the duty cycle of the DC/DC converter based on the first error signal,wherein if the first output voltage is lower than the first voltage reference, the error generator reduces the duty cycle of the DC/DC converter and a charging current of the battery based on the first error signal so that the first output voltage increases to the first voltage reference.
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Accused Products
Abstract
A power management system adjusts a first output voltage delivered to a load and adjusts a second output voltage delivered to a battery. The power management system includes an error amplifier for comparing the first output voltage with a first voltage reference indicative of an operating voltage of the load and for accordingly generating a first error signal. The power management system further includes a DC/DC converter for adjusting the first output voltage and the second output voltage by adjusting a duty cycle of the DC/DC converter and an error generator for controlling the duty cycle based on the first error signal. If the first output voltage is lower than the first voltage reference, the error generator reduces the duty cycle and a charging current of the battery based on the first error signal.
26 Citations
20 Claims
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1. A power management system, comprising:
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an error amplifier, operable for comparing a first output voltage delivered to a load with a first voltage reference indicative of an operating voltage of the load and for accordingly generating a first error signal; a DC/DC converter, coupled to a battery, that is operable for adjusting the first output voltage and a second output voltage delivered to the battery, by adjusting a duty cycle of the DC/DC converter; and an error generator, coupled between the error amplifier and the DC/DC converter, that is operable for controlling the duty cycle of the DC/DC converter based on the first error signal, wherein if the first output voltage is lower than the first voltage reference, the error generator reduces the duty cycle of the DC/DC converter and a charging current of the battery based on the first error signal so that the first output voltage increases to the first voltage reference. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A power management method, comprising:
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comparing a first output voltage delivered to a load, with a first voltage reference indicative of an operating voltage of the load and accordingly generating a first error signal; controlling a duty cycle of a DC/DC converter based on the first error signal; and adjusting the first output voltage and a second output voltage delivered to a battery, by adjusting the duty cycle of the DC/DC converter, wherein if the first output voltage is lower than the first voltage reference, the duty cycle of the DC/DC converter and a charging current of the battery are reduced based on the first error signal so that the first output voltage increases to the first voltage reference. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification