AC voltage control circuit
First Claim
1. An AC voltage control circuit for use in a power saving device for a discharge lamp, wherein the AC voltage control circuit comprises:
- a first voltage terminal supplied with the voltage of an output stage of the power saving device;
a current terminal supplied with the current of the power saving device;
a first comparator for comparing the input voltage of the first voltage terminal and a predetermined target output voltage;
a second comparator for comparing the input voltage of the first voltage terminal and a predetermined permissible voltage;
a third comparator for comparing the input current of the current terminal and a predetermined permissible current;
a central processing unit connected to the first, second and third comparators, so that the central processing unit controls the output voltage of the power saving device according to the result of voltage comparison of the first comparator and controls the power saving device to be protected from abnormal voltage and current according to the results of the voltage comparison of the second comparator and the current comparison of the third comparator;
a switching means for converting the output voltage of the power saving device under the control of the central processing unit; and
a timer connected to the central processing unit.
1 Assignment
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Accused Products
Abstract
The inventive control circuit 40 serves to render the output voltage to be the output value of any one of the outputs OUT1 to OUT5 when both the main power source A of the power saving device 100 and the control circuit'"'"'s switch B are in ON state, and to maintain the output value to be constant by the operations of the comparator, CPU or the like in the control circuit 40. In addition, if the input voltage or input current is excessively high or low, the control circuit 40 can cut off the voltage or current, so that the protection device 100 can be protected from abnormal voltage or abnormal current.
10 Citations
2 Claims
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1. An AC voltage control circuit for use in a power saving device for a discharge lamp, wherein the AC voltage control circuit comprises:
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a first voltage terminal supplied with the voltage of an output stage of the power saving device; a current terminal supplied with the current of the power saving device; a first comparator for comparing the input voltage of the first voltage terminal and a predetermined target output voltage; a second comparator for comparing the input voltage of the first voltage terminal and a predetermined permissible voltage; a third comparator for comparing the input current of the current terminal and a predetermined permissible current; a central processing unit connected to the first, second and third comparators, so that the central processing unit controls the output voltage of the power saving device according to the result of voltage comparison of the first comparator and controls the power saving device to be protected from abnormal voltage and current according to the results of the voltage comparison of the second comparator and the current comparison of the third comparator; a switching means for converting the output voltage of the power saving device under the control of the central processing unit; and a timer connected to the central processing unit. - View Dependent Claims (2)
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Specification