| CPC G06F 1/3212 (2013.01) [G06F 1/3287 (2013.01)] | 15 Claims |
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1. A power saving system of a battery charger, comprising:
a first transistor, wherein a control terminal of the first transistor is connected to an external power circuit and receives a wake-up signal from the external power circuit, and a first terminal of the first transistor is coupled to an input voltage;
a second transistor, wherein a first terminal and a control terminal of the second transistor are connected to a second terminal of the first transistor, and a second terminal of the second transistor is grounded;
a counter, wherein a trigger terminal of the counter is connected to the first terminal of the first transistor, and when the counter receives the wake-up signal and is woken up by the wake-up signal in a power saving mode, the counter determines whether or not a working period of the wake-up signal is larger than a time threshold to output a counting signal; and
an operation management circuit connected to the counter and an electronic device, wherein the electronic device is coupled to a battery, and the operation management circuit is configured to receive the counting signal from the counter;
wherein, when the counting signal received by the operation management circuit in the power saving mode indicates that the working period of the wake-up signal is not larger than the time threshold, the operation management circuit turns off the counter and a plurality of electronic components included in the electronic device;
wherein, when the counting signal received by the operation management circuit in the power saving mode indicates that the working period of the wake-up signal is larger than the time threshold, the operation management circuit determines whether or not the battery is switched from the power saving mode to a normal operation mode, and triggers the electronic device to be turned on and to receive power from the external power circuit or the battery.
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