Fault protection methods and apparatus for cold cathode fluorescent lamps
OwnerBairen Liu, Lei Du +1inventors
InventorsBairen Liu, Lei Du, Yuancheng Ren
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Abstract
The present disclosure provides methods and apparatus for fault protection for electronic devices (e.g., cold cathode fluorescent lamps). In one embodiment, a fault signal is detected and compared with a threshold to output a comparison signal. The comparison signal is then processed to generate a trigger signal, which triggers a fault control block once it satisfies certain fault conditions.
Claims46
A fault protection method for a CCFL driving system, comprising:
- detecting a fault signal;
- comparing the fault signal with its corresponding threshold voltage to obtain a comparison signal;
- and
- processing the comparison signal to generate a trigger signal and triggering a fault control block when the trigger signal satisfies certain fault conditions.
A fault protection circuit for a CCFL driving system, comprising:
- a comparator configured to receive a negative logic fault signal, compare the negative logic fault signal with a corresponding threshold voltage to output a comparison signal;
- an “AND” gate logic configured to receive the comparison signal and a pulse dimming signal to generate a control signal;
- a delay timer configured to receive and process the control signal to generate a trigger signal;
- and
- a fault control block configured to receive the trigger signal, and is triggered when the trigger signal satisfies a predetermined fault condition.
A fault protection circuit for a CCFL driving system, comprising:
- a comparator configured to receive a positive logic fault signal and to compare the positive logic fault signal with a corresponding threshold voltage to output a comparison signal;
- a pulse prolong block configured to receive the comparison signal and prolong the pulse period of the comparison signal to generate a trigger signal;
- and
- a fault control block configured to receive the trigger signal, and is triggered when the trigger signal satisfies a predetermined fault condition.
A fault protection circuit for CCFL driving system, comprising a fault control block, a first circuit unit and a second circuit unit coupled in parallel to the fault control block;
- wherein
- the first circuit unit comprises:
- a first comparator configured to receive a negative logic fault signal, comparing the negative logic fault signal with a first threshold voltage to output a first comparison signal;
- an “AND” gate logic configured to receive the first comparison signal and a pulse dimming signal to generate a control signal;
- and
- a delay timer configured to receive and processing the control signal to generate a first trigger signal;
- and
- the second circuit unit comprises:
- a second comparator configured to receive a positive logic fault signal, comparing the positive logic fault signal with a second threshold voltage to output a comparison signal;
- a pulse prolong block configured to receive the comparison signal and prolong the pulse period of the comparison signal to generate a second trigger signal;
- and
- the fault control block receives the first trigger signal and the second trigger signal, and when the first and/or the second trigger signal satisfies certain fault conditions, the fault control block is triggered.
Dependencies are inferred from the claim text.