Patent ID: 8867297

Claim:
A charge/discharge control circuit, comprising: a capacitor, having a first terminal electrically coupled to ground; a discharge circuit, having a first terminal electrically coupled to a second terminal of the capacitor, having a second terminal electrically coupled to ground, and having a third terminal electrically coupled to a power source and a storage system, the discharge circuit configured to discharge a voltage level at the first terminal of the discharge circuit when a voltage level at the third terminal of the discharge circuit is lower than a threshold voltage level of the storage system; and a switch module, having a first terminal electrically coupled to the third terminal of the discharge circuit and having a second terminal electrically coupled to the first terminal of the discharge circuit, the switch module configured to electrically allow only a first current to flow from the power source to the second terminal of the capacitor when a voltage level of the power source is higher than an activate voltage level of the storage system and configured to allow only a second current to flow from the second terminal of the capacitor to the storage system when the voltage level of the power source is lower than the activate voltage level of the storage system; wherein the activate voltage level of the storage system is higher than the threshold voltage level of the storage system.