| 摘要 |
A valley-fill circuit with active conduction angle control allows use of a single storage capacitor instead of two. The capacitor is charged to the maximum voltage of the AC cycle, which makes possible use of low-capacitance high-voltage low ESR capacitors, increases energy storage density and decreases circuit footprint. This makes it feasible to use ceramic capacitors, such as a multilayer ceramic (MLCC), polyethylene, polypropylene, or any suitable capacitor type in addition to electrolytic capacitors. This improves the operational longevity and reduces the footprint of the circuitry. |
| 主权项 |
1. A circuit, which charges a storage capacitor to a peak-to-peak voltage of AC cycle and has means for initiating discharge, which can comprise:
a transistor, comprises gate, drain, source, or body electrodes, or any combination of these electrodes; a storage capacitor, coupled between a first node and ground, wherein the storage capacitor is implemented using a ceramic, polyethylene, polypropylene, or any other suitable capacitor type, other than a electrolytic type capacitor, that may be needed for high-reliability operation; a pair of a first diode and a resistance, connected in parallel to each other and in series to a storage capacitor, to control peak charging current of a capacitor and dampen input current oscillations; a second diode switch, which isolates storage capacitor from external power input while output circuit is supplied by the storage capacitor; and a body diode of the transistor, coupled between the drain and source electrodes of the transistor. |
