| 摘要 |
The present invention provides a balance apparatus for line input capacitors. A programmable N-current-sink is connected in parallel to a high-side capacitor, and a programmable P-current-sink is connected in parallel to a low-side capacitor. A resistor network is coupled between the high-side capacitor and the low-side capacitor to generate a differential voltage. The differential voltage is the voltage difference of the high side capacitor and the low side capacitor. When the voltage of the high-side capacitor is higher than the voltage of the low-side capacitor, the programmable N-current-sink will sink an N-current that is proportional to the differential voltage. If the voltage of the low-side capacitor is higher than the voltage of the high-side capacitor, the programmable P-current-sink will sink a P-current that is also proportional to the differential voltage. When the differential voltage is small, both the N-current-sink and the P-current-sink will be turned off to reduce power consumption.
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