Electric lamp and discharge devices: systems – Current and/or voltage regulation – Plural load device regulation
Reexamination Certificate
2000-11-22
2001-12-11
Vu, David (Department: 2821)
Electric lamp and discharge devices: systems
Current and/or voltage regulation
Plural load device regulation
C315S315000, C315S316000
Reexamination Certificate
active
06329766
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an illumination adjusting circuit, and more especially to a digital illumination adjusting circuit which can adjust the output to a power level of an alternating load via a digital setting manner.
2. Description of the Prior Art
Traditional illumination adjusting circuit controls the illumination level of a light or bulb by a TRIAC cooperating with a conductive angle controlling circuit and a variable resistor. However, this traditional illumination adjusting circuit can only adjust the illumination of the light while not able to perform varieties of illumination pattern setting and programming. Therefore, this traditional illumination adjusting circuit can only be applied in illumination adjusting function, neither applied for other fields nor combined with other digital circuit for more flexible use.
Moreover, the adjusting of the conductive angle of the traditional illumination adjusting circuit is achieved by adjusting a variable resistor. Since the adjusting work is done manually, the precision of the adjusting is not satisfactory and the user can only estimate by eye vision for the output power level. This may be satisfactory in a normal illumination adjusting, but it can not meet the more precise illumination adjusting or cooperate with other digital circuit to achieve other purposes.
It is requisite and valuable to design an illumination adjusting circuit which can be optionally set by the user's intention with very high precision.
SUMMARY OF THE INVENTION
Therefore, the primary purpose of the present invention is to provide a digital illumination adjusting circuit which can adjust illumination with very high precision by digital adjusting.
Another purpose of the present invention is to provide a digital illumination adjusting circuit which cooperates with a microprocessor to provide varieties of applications by digital adjusting and predetermined programs.
Further another purpose of the present invention is to provide a digital illumination adjusting circuit for setting varieties of functions such as setting the on/off timing for a light, setting the illumination level in advance, setting the on/off pattern of a light, setting the illumination levels at different time periods.
One aspect of the present invention is to provide a digital illumination adjusting circuit comprising a microprocessor unit, a power phase detecting circuit, a time base signal generating circuit, a display, and an input pad. In operation, the microprocessor unit receives a phase synchronization signal from the power phase detecting circuit, utilizing half cycle of the alternating current power as a counting period, utilizing a time base signal generated from the time base signal generating circuit as counting pulses for the counting period. The microprocessor generates a switch control signal for controlling a conductive angle of the switch circuit which in turn controls the power outputted to the load.
REFERENCES:
patent: 5530322 (1996-06-01), Ference et al.
Chang Dragon
Liu Daniel
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