IR Standby Wake-Up Circuit for Low-Power Display Power Supply
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Solution Overview
Problem
Existing display devices face significant power consumption issues in standby mode due to continuous switching operations by components like flyback controllers and LLC structures, necessitating a method to minimize power usage during this state.
Innovation Solution
The implementation of a first integrated circuit (IC) that consumes less power in standby mode, utilizing a relay to physically disconnect power supply, and a second IC that is turned on only when needed, along with a capacitor management system to optimize power usage, reducing power consumption by limiting operations to half cycles and employing a voltage detector to manage current flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the second IC is kept in a turned-on state to supply power to the FET, then the device can respond quickly to control commands, but power consumption increases during standby mode
Solution Approach 1:
The first IC is activated in advance during standby mode to monitor for control commands. This preliminary action allows the system to quickly transition from standby to active state without keeping the power-intensive second IC running continuously, thus maintaining fast response while reducing standby power consumption.
Solution Approach 2:
The system alternates between standby mode (with first IC only) and active mode (with second IC turned on). This periodic switching allows the high-power second IC to remain off during standby periods while still enabling quick activation when needed, balancing response speed with power savings.
2Use of energy by moving object
If the relay is used to physically disconnect power supply in standby mode, then power consumption is reduced, but the complexity of the power supply system increases
Solution Approach 1:
The relay acts as an intermediary component that physically disconnects the power supply from the second IC during standby mode. This mediator enables clean power isolation to reduce standby consumption while keeping the control logic simple, as the relay automatically switches based on the state of the second IC.
3Use of energy by moving object
If capacitors are continuously charged and discharged to manage power, then power distribution is optimized, but the lifespan of capacitors decreases
Solution Approach 1:
The capacitors are charged and discharged periodically only when the second IC is activated, rather than continuously. This periodic operation reduces the total number of charge-discharge cycles, thereby extending capacitor lifespan while still maintaining efficient power distribution during active periods.
Solution Approach 2:
During standby mode, the power supply remains connected and ready, maintaining the potential for immediate power delivery without requiring continuous capacitor cycling. The system sustains readiness state without the mechanical stress of repeated charging/discharging, preserving capacitor life while ensuring continuous power availability when needed.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly reduces power consumption in standby mode by minimizing unnecessary power usage, extending the lifespan of capacitors through periodic activation of the second IC, and reducing overall energy loss.
Implementation Method 1
a first capacitor charged during a half cycle of alternating current power and discharged during a remaining half cycle
Implementation Method 2
a second capacitor discharged during the half cycle and charged during the remaining half cycle
Implementation Method 3
a current limiter configured to cut off the AC power during the remaining half cycle
Implementation Method 4
a voltage detector to operate based on magnitude of power supplied to the first IC
Data Source
AI summary
An electronic device comprising: a power supply to supply power; an infrared rays (IR) receiver; a first integrated circuit (IC) to drive the IR receiver based on the power supplied from the supply; and a second IC to supply power to a field-effect transistor (FET), wherein, when a preset control command is received through the IR receiver, the first IC turns on the second IC to drive the FET, which is connected to the second IC and is in a stopped state while the second IC is in a turned-off state, by turning on the second IC to thereby supply power to the electronic device.