Remote Light-Receiving Circuit With Periodic Power Switching
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Solution Overview
Problem
Conventional remote control signal receiving circuits in electronic devices, such as TVs and air conditioners, experience high power consumption due to the continuous operation of light-receiving devices and microcomputers that control them.
Innovation Solution
A microcomputer with a drive circuit that intermittently powers a light-receiving device using a switching device, allowing the system to enter a standby state to reduce power consumption, and switches to active mode only when a remote control signal is detected, optimizing power usage by alternating between standby and operational states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the light-receiving device operates continuously to receive remote control signals, then the signal reception reliability is improved, but the power consumption increases
Solution Approach 1:
The light-receiving device alternates between active and standby states in periodic cycles. During active periods, the device receives remote control signals; during standby periods, power supply is interrupted to reduce consumption. This periodic operation resolves the contradiction by maintaining signal reception capability while significantly reducing average power consumption.
2Reliability
If the microcomputer operates continuously to process remote control signals, then the signal processing reliability is improved, but the power consumption increases
Solution Approach 1:
The microcomputer operates in periodic cycles, being activated only during periods when remote control signal processing is required and remaining in low-power standby mode during intervals without signals. This periodic operation maintains signal processing reliability while reducing overall power consumption.
3Loss of energy
If the light-receiving device is powered off for extended periods to reduce power consumption, then the power saving is improved, but the response time to receive signals increases
Solution Approach 1:
The system dynamically adjusts the light-receiving device's operational state based on real-time conditions. The device transitions between active and standby states according to the presence of remote control signals, optimizing the balance between power saving and response time by being ready to activate when signals are detected.
Data Source
AI summary
A power consumption of a light-receiving device is reduced while a power consumption of a microcomputer that controls the light-receiving device is reduced as well. The microcomputer is structured to include a drive circuit, a sampling/detection circuit, a timer, a system clock generation circuit, a CPU, a ROM and a RAM. The CPU stops providing the light-receiving device with a power supply by turning off a P channel type MOS transistor with the drive circuit and sets the microcomputer in a standby state for a predetermined period of time. When the microcomputer is released from the standby state, the CPU starts providing the light receiving device with the power supply by turning the P channel type MOS transistor on with the drive circuit.