Low Energy Protection Circuit for LED Backlight Driving
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Solution Overview
Problem
Existing LED backlight driving circuits experience energy consumption in peripheral small-signal circuits and voltage-dividing resistors due to input voltage persistence during protection states, leading to inefficiencies and component lifespan reduction.
Innovation Solution
A protection circuit with a detection circuit and a switch circuit, where the switch circuit is disposed between the power supply and peripheral step-down shunt, utilizing a PNP or PMOS transistor to control the flow of input voltage, reducing energy consumption without affecting response time or circuit lifespan.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the protection mechanism is activated to stop outputting driving signals to the MOS transistor, then the LED string is turned off and abnormal current is prevented, but the input voltage still exists causing energy consumption in peripheral small-signal circuit and voltage-dividing resistors
Solution Approach 1:
The patent extracts the input voltage from the peripheral small-signal circuit and voltage-dividing resistors by introducing a switching circuit that disconnects the power supply during protection state. This separates the power supply function from the protection function, allowing the protection mechanism to activate without maintaining unnecessary voltage in non-critical circuit portions, thereby eliminating the energy consumption problem while preserving the protection capability.
2Use of energy by moving object
If the entire power supply is cut off to achieve protection control, then energy consumption is reduced, but the response delay of the overall power supply circuit increases and component lifespan is reduced
Solution Approach 1:
The patent applies local quality by selectively disconnecting only the power supply to peripheral small-signal circuits and voltage-dividing resistors through the switching circuit, while maintaining power supply to critical components including the detection circuit and control logic. This localized power management approach reduces energy consumption in non-essential areas without causing overall system response delay or component lifespan reduction, as the critical protection function remains powered and responsive.
3Use of energy by moving object
If the power supply is cut off during protection state, then energy consumption is reduced, but the lifespan of circuit components is reduced due to repeated on-off cycling
Solution Approach 1:
The patent extracts and isolates the power supply disconnection action to only affect peripheral components (small-signal circuits and voltage-dividing resistors) through the switching circuit, while the main protection circuitry remains powered. This selective extraction prevents the harmful effect of complete power cycling on all components, reducing energy consumption without subjecting critical components to repeated on-off stress that would reduce their lifespan.
Data Source
AI summary
The present invention provides a protection circuit with low energy-consumption and a driving circuit thereof. The protection circuit includes a detection circuit and a switch circuit. The switch circuit is disposed between a power supply circuit and a peripheral step-down shunt. The detection circuit and the switch circuit are connected for controlling. The switch circuit includes a PNP triode or a P MOS transistor connected between the power supply circuit and the peripheral step-down shunt. A base of the PNP triode or the P MOS transistor is connected to a drain of another N MOS transistor through a resistor, and a gate of the N MOS transistor is connected to a status pin of the detection circuit. The present invention solves drawbacks of existent input voltage after the circuit entering a protection state causing unnecessary energy-consumption in peripheral small-signal circuit and voltage-dividing resistors.