Dual Charging Circuit Power Source Device Heat Noise Control
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Solution Overview
Problem
Existing power source device charging methods face challenges in suppressing heat and noise generation, with resistance-based methods experiencing high heat at low voltages and switching-based methods generating noise.
Innovation Solution
A power source device with dual charging circuits, a switch unit, and a control unit that dynamically switches between resistive and switching-based charging based on the output voltage state of the power storage unit to optimize current flow and minimize heat and noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a resistance unit is used to limit charging current, then heat generation is suppressed, but charging speed decreases
Solution Approach 1:
The patent applies dynamics by making the resistance value variable rather than fixed. The switching element dynamically adjusts the effective resistance in the charging circuit based on real-time voltage detection. When voltage is low, resistance is kept low to enable fast charging; when voltage rises, resistance increases to suppress heat generation. This dynamic adaptation resolves the contradiction between charging speed and heat suppression.
Solution Approach 2:
The patent changes the resistance parameter dynamically during the charging process. By detecting voltage levels and adjusting the resistance value accordingly, the system transitions from a fixed resistance approach to a variable resistance approach. This parameter change allows the system to optimize both charging speed and heat management at different stages of the charging process.
2Productivity
If a low resistance value is used to increase charging speed, then charging efficiency improves, but heat generation increases
Solution Approach 1:
The system uses dynamic resistance adjustment where the resistance value changes over time based on voltage conditions. During early charging when voltage is low, low resistance maintains high charging efficiency. As voltage increases and heat becomes a concern, the resistance automatically increases to reduce power dissipation. This temporal variation in resistance resolves the contradiction between efficiency and heat management.
Solution Approach 2:
The patent implements feedback control by continuously detecting the voltage across the power storage unit and using this information to adjust the resistance. The detection unit monitors voltage levels, and based on this feedback, the switching element modifies the resistance value. This closed-loop feedback mechanism ensures that resistance is optimized for both charging efficiency and heat suppression at each moment during charging.
3Productivity
If switching operations are used to control charging current, then charging speed increases, but noise generation occurs
Solution Approach 1:
The patent introduces an intermediate approach by using a switching element not for direct on-off control, but for dynamic resistance adjustment. Instead of abrupt switching that causes noise, the system uses the switching element to smoothly vary the resistance value in response to voltage conditions. This intermediary function of the switching element maintains fast charging capability while eliminating the harmful noise associated with conventional switching operations.
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
The solution effectively reduces heat generation by using the resistive circuit at high voltages and noise reduction by using the switching circuit at low voltages, while maintaining efficient charging.
Implementation Method 1
a resistance unit 24, a charging current based on power from the power source unit 91 flowing in the resistance unit 24
Implementation Method 2
a switching element 32 provided in a second energizing path 72 between the power source unit 91 and the power storage unit 92, that through on-off operations of the switching element 32 converts an input voltage applied to an input-side conduction path
Data Source
AI summary
A power source device, capable of charging a power storage device using power from a power source, is realized with a configuration capable of suppressing the generation of heat and noise. The power source includes a controller that determines an output state of a power storage device on the basis of a detection value detected by a voltage detection circuit. When the output state of the power storage device corresponds to a prescribed high-voltage state when prescribed charging conditions are satisfied, the controller causes only a first charging circuit, among the first charging circuit and a second charging circuit, to operate. When the output state corresponds to a prescribed low-voltage state, the controller causes only the second charging circuit to operate.