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Solar power system

IP.com Disclosure Number: IPCOM000008373D
Publication Date: 2002-Jun-11
Document File: 1 page(s) / 60K

Publishing Venue

The IP.com Prior Art Database

Abstract

ID609025

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 94% of the total text.

Solar power system

A solar power system that is coupled to the mains supply consumes some standby

power from the mains supply in the dusk to dawn period. Since during the night there

is little or no sun light to be converted into electrical power, this standby power

consumed by the system can cause a negative efficacy of the system during the night.

This negative efficacy can be prevented by equipping the solar power system with a

dusk to dawn switch, such as often used in outdoor lamps. The dusk to dawn switch

switches the solar power system off when the (sun) light level drops below a

predetermined value at dusk. When the light level increases again at dawn, the dusk to

dawn switch switches the solar power system on. In this way the solar power system

is prevented from consuming standby power when there is little or no sun light and

the overall efficacy of the solar power system is increased. The same dusk to dawn

switch that switches the solar power system on and off can be used to also switch a

safety light on when the solar power system is switched off and vice versa. A dusk to

dawn switch is often equipped with a light sensor (and some electronics if necessary)

for generating a signal that represents the (sun) light level and a circuit for generating

a reference signal that represents the level of the sun light below which the solar

power converter needs to be switched off. The signal that represents the (sun) light

level is compared with the reference signal and the o...