Remote Controller Voltage Drop Mitigation via Slew Rate Control

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Solution Overview

Problem

Bluetooth remote controllers with voice functions experience frequent voltage drops during standby mode, leading to increased probability of system resets when the voice function is activated, negatively impacting user experience.

Innovation Solution

Implement a method to sample the battery voltage at regular intervals in standby mode, determine the internal resistance of the battery, and adjust the slew rate of the switch starting the voice function to minimize voltage drops, thereby reducing the likelihood of system resets.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If the voice function is activated in standby mode, then the voice function can be used, but the voltage drops significantly causing system resets

Engineering Contradiction:

Improvevoice function activationVSAvoidsystem stability

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The system performs preliminary voltage sampling and internal resistance measurement during standby mode before voice function activation. Based on these pre-measured values, the slew rate of the power switch is adjusted in advance to prevent voltage drops that would cause system resets, thereby maintaining reliability while enabling voice function operation.

Inventive Principle:

Principle #10Preliminary action

2Adaptability or versatility

If the battery voltage is low, then the remote controller can still operate, but the probability of system reset increases

Engineering Contradiction:

Improveoperation at low voltageVSAvoidsystem reset probability

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The system measures the battery's internal resistance during standby mode and uses this parameter to dynamically adjust the slew rate of the power switch. By changing the slew rate parameter based on the measured internal resistance, the system can operate reliably at low battery voltages without increasing reset probability, thus maintaining both adaptability and reliability.

Inventive Principle:

Principle #35Parameter changes

3Speed

If the slew rate of the power switch is high, then the voice function starts quickly, but the voltage drop becomes greater

Engineering Contradiction:

Improvevoice function startup speedVSAvoidvoltage drop

Core Design Contradiction:

SpeedVSLoss of energy

Solution Approach 1:

The system dynamically adjusts the slew rate parameter of the power switch based on the measured battery internal resistance. By optimizing the slew rate to match the battery's characteristics, the system achieves a balance between startup speed and voltage stability, minimizing voltage drops while maintaining acceptable voice function activation speed.

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS12283275B2Method for controlling remote controller to avoid loss of function through a low voltage condition, remote controller device, and non-transitory storage medium

Publication Date: 2025.04.22 NANNING FUGUI PRECISION IND CO LTD

AI summary

A method of controlling a battery-powered remote controller to decrease a duty cycle to allow continued operations despite the quantity of the battery is bad. The method determines a drop in voltage of the battery in standby mode as voltage of the battery is being read. When receiving a command to activate a voice function, determining whether the drop in voltage in the standby mode is greater than or equal to a preset value. If the drop is greater than or equal to the preset value, the method then determines whether the drop in voltage falls in a preset range. If the drop falls in the preset range, the method regulates a duty cycle of the pulse signal activating the voice function, and activates the voice function as required. A remote controller and a non-transitory storage medium are also provided.