| 摘要 |
The present invention provides a circuit and method for charging a capacitor with a power source. The circuit includes a capacitor, a power source, and at least two binary-controlled current sources. Each of these current sources is energized by the power source and provides either no current or a predetermined current to the capacitor. Importantly, the two predetermined currents are distinct. The circuit also includes a voltage comparator, which senses changes in the voltage of the power source. In addition, the circuit includes a logic device, which is electrically connected to the current sources and to the voltage comparator. The logic device selects one of the current sources to charge the capacitor based on information obtained by the voltage comparator, i.e. changes in voltage of the power source. Thus, this circuit allows a selectable charging current to be provided to the capacitor based on the voltage of the power source.
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