Image Capture Power Supply Dynamic Current Limiting
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Solution Overview
Problem
Existing image capturing apparatuses face issues with peak current increases during high-speed pixel data readout, leading to potential system failures due to battery voltage drops and increased equivalent series resistance (ESR) in power storage devices like electric double layer capacitors.
Innovation Solution
The apparatus employs a control unit that dynamically manages power supply to the load circuit by obtaining the resistance value of the storage device and adjusting current limitations based on this value. In a first state, power is supplied solely from the main power source, while in a second state with higher power consumption, power is supplied from both the main power source and the storage device, optimizing current distribution to reduce peak currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If high-speed pixel data readout is performed to reduce rolling shutter distortion, then image quality and readout speed are improved, but peak current increases causing battery voltage drop and system failure
Solution Approach 1:
The patent implements dynamic power supply management by switching between different power sources (battery and power storage device) based on real-time current consumption levels. The control unit monitors current draw and dynamically adjusts power source contribution, allowing high-speed readout when power is sufficient while preventing voltage drop when peak current exceeds battery tolerance.
Solution Approach 2:
The patent introduces a power storage device as an intermediary between the battery and the image capturing sensor. This intermediary absorbs peak current demands during high-speed readout operations, preventing direct excessive current draw from the battery and maintaining system stability while enabling high-speed operation.
2Reliability
If current from battery is reduced by using power storage device to handle peak current, then battery voltage stability is improved, but equivalent series resistance of power storage device increases especially in low-temperature environments
Solution Approach 1:
The patent monitors the equivalent series resistance of the power storage device and dynamically adjusts its usage based on temperature and resistance conditions. When ESR exceeds a threshold (indicating low-temperature or degraded conditions), the system reduces reliance on the power storage device and increases battery contribution, optimizing performance across varying environmental conditions.
Solution Approach 2:
The patent implements feedback control by continuously monitoring the equivalent series resistance of the power storage device and adjusting power source allocation accordingly. The control unit uses ESR measurements to determine optimal power source mixing ratios, reducing power storage device usage when ESR is high and maximizing its contribution when ESR is low, thereby maintaining system efficiency across different operating conditions.
3Reliability
If frequent charging and discharging of power storage device is performed to supply peak current, then peak current reduction is achieved, but power loss increases due to equivalent series resistance
Solution Approach 1:
The patent dynamically changes the operating parameters of the power storage device based on its ESR condition. When ESR is low, the system allows frequent charging/discharging cycles to manage peak current. When ESR increases, the system reduces the frequency and magnitude of charging/discharging operations, accepting greater battery contribution to minimize energy loss while still maintaining peak current management.
Solution Approach 2:
The patent implements dynamic adjustment of power storage device utilization based on real-time ESR monitoring. The control unit continuously optimizes the balance between using the power storage device for peak current management and minimizing energy loss, adjusting its strategy based on current ESR levels, temperature conditions, and power consumption requirements.
4Reliability
If power is supplied solely from power storage device during high power consumption states, then peak current is reduced, but charging and discharging frequency increases causing increased ESR loss
Solution Approach 1:
The patent applies different power supply strategies to different operational contexts. Instead of uniformly relying on the power storage device for all high-power states, the system evaluates local conditions (ESR level, temperature, power consumption duration) and selects the optimal power source mix for each specific situation, minimizing ESR loss while maintaining peak current management where needed.
Solution Approach 2:
The patent uses partial action by having the power storage device contribute only to the extent necessary for peak current management rather than supplying all power during high consumption states. The control unit calculates the optimal contribution level based on ESR conditions, using the power storage device partially to reduce peak current while avoiding excessive charging/discharging that would increase energy loss.
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 solution effectively reduces peak currents and minimizes power losses by dynamically adjusting power supply based on the storage device's resistance, thereby preventing system failures and improving battery retention.
Implementation Method 1
a power storage device (202) configured to supply power to the load circuit (1072)
Implementation Method 2
obtains a value of a resistance of the power storage device (202)
Data Source
AI summary
An apparatus includes a load circuit, a power source, a storage device, an obtaining unit that obtains a value of a resistance of the storage device, and a control unit. The control unit, in a first state, performs control so that power is supplied from the power source to the load circuit without power being supplied from the storage device to the load circuit and, in a second state of the apparatus, performs control so that power is supplied from the power source and the storage device to the load circuit, and the control unit changes limitation of a current value of a current supplied from the power source to the load circuit depending on the value of the resistance.