Remote Controller IR Signal Stability with Parallel Ceramic Capacitors
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Solution Overview
Problem
Remote controllers using lithium-ion batteries face interruptions in infrared signal transmission due to increased internal resistance of the battery, which causes a decrease in power supply voltage and resets the microcomputer, leading to disrupted signal transmission.
Innovation Solution
The remote controller includes a lithium-ion battery connected in parallel with an infrared signal transmission unit, a microcomputer, and a series of capacitors, including ceramic capacitors, to maintain power supply voltage and prevent microcomputer resets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a lithium-ion battery is used in a small remote controller, then the remote can be made compact and cost-effective, but the battery's internal resistance increases over time causing power supply voltage to drop below the microcomputer's reset voltage, resulting in interruption of infrared signal transmission
Solution Approach 1:
The patent applies preliminary action by introducing a capacitor connected in parallel with the microcomputer before the power supply voltage drops below the reset voltage. The capacitor stores electrical energy and releases it when the voltage drops, preventing the microcomputer from resetting and ensuring continuous infrared signal transmission. This proactive measure counteracts the inevitable voltage drop caused by battery internal resistance increases over time.
2Reliability
If capacitors are added to maintain power supply voltage, then infrared signal transmission continuity is improved, but the device complexity and mounting space requirements increase
Solution Approach 1:
The patent applies local quality by placing the capacitor specifically in parallel with the microcomputer rather than adding it to the entire power supply circuit. This localized approach provides voltage stabilization exactly where needed (at the microcomputer) without unnecessarily complicating the entire circuit. The capacitor is strategically positioned to prevent microcomputer resets while minimizing added complexity.
3Reliability
If higher-capacitance capacitors are used to maintain power supply voltage, then power supply stability is improved, but the mounting space and cost increase
Solution Approach 1:
The patent applies partial action by using a capacitor with sufficient capacitance to prevent microcomputer resets during normal battery aging, without over-engineering the solution with excessively large capacitors. The capacitor value is optimized to provide just enough voltage stabilization to maintain reliable infrared signal transmission throughout the battery's service life, avoiding unnecessary space consumption and cost.
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 configuration effectively prevents interruptions in infrared signal transmission even when the lithium-ion battery's internal resistance increases, ensuring continuous operation of the remote controller.
Implementation Method 1
a plurality of capacitors connected in parallel with the microcomputer and including at least two ceramic capacitors
Implementation Method 2
capacitors connected in parallel with the microcomputer and including at least two ceramic capacitors, to maintain power supply voltage
Implementation Method 3
A lithium-ion battery experiences increasing internal resistance due to aging degradation caused by an air environment
Data Source
AI summary
A remote that refers to a remote controller includes a lithium-ion battery; an infrared signal transmission unit and a resistor that are connected in parallel with the lithium-ion battery, with the resistor being a first resistor connected in series with the infrared signal transmission unit; a micro as a microcomputer that controls transmission of an infrared signal from the infrared signal transmission unit and is connected in parallel with the lithium-ion battery; and a plurality of capacitors that are connected in parallel with the micro and include at least two ceramic capacitors.