| 摘要 |
Power perfector (power factor correction) apparatus for coupling to a domestic electrical mains supply, and supplying mains power to a variety of electrical appliances. The mains supply includes a reactive power component (Q), an apparent power component (S), a real power component (P) and a load component, whilst the invention is reported to reduce all three components, including the real component. The apparatus comprises mains coupling means, for example a two or three pin plug (figure 7) and at least one parallel capacitor C604. In one embodiment the capacitor has a large bleed resistor 605 of 1 MQ placed across the capacitor to discharge the capacitor when removed from the mains. In addition the apparatus has a voltage dependent resistor 606 which is included for protection against high voltage transients on the mains supply. The voltage dependent resistor 606 can be a metal oxide resistor. The apparatus may also include a series fuse to protect the circuit from an over current transient. The apparatus may also include a light or LED 802 for illumination, and an adjustable series resistor 1002. Alternatively the device may be placed in a domestic appliance. The mains coupling means and the at least one capacitor 604 are connected to one another in parallel and, in use, the apparatus reduces the real power (R) of the mains supply component by reducing both the reactive power (Q) and the apparent power (S) components.
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