| 摘要 |
An electrical conversion apparatus is described which comprises a bridge rectifier 10 having an input side and an output side, and a switched capacitor line 16 arranged in parallel with the output side of the bridge rectifier 10, the switched capacitor line 16 comprising a capacitance 18 and a switch 20 arranged in series with one another so that the switch 20 can control charging and discharging of the capacitance 18. A method of electrical conversion is also disclosed wherein when the output voltage of the bridge rectifier is above a threshold level 26 and is rising the switch is closed so that the capacitance charges and a load is satisfied from the output of the bridge rectifier, when the output of the bridge rectifier is above the threshold level 26 and is falling the switch is opened so that the capacitance is isolated from the load, the load still being satisfied by the output of the bridge rectifier, and when the output of the bridge rectifier is below the threshold level 26, the switch is closed so that the load is served by discharge of the capacitance. The threshold level 26 may be dynamically controlled, for example in response to the output of a monitor circuit 32. |
