EDLC Backup Power Discharge Control for Longer Service Life
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Solution Overview
Problem
The characteristic degradation of electrical double layer capacitors in backup power supplies leads to reduced usability and potential hindrances in current supply to loads, necessitating a solution to extend their operational time and maintain effectiveness.
Innovation Solution
A power supply device incorporating an electrical double layer capacitor, a discharge circuit with a discharging resistor, and a power supply controller that measures voltage and controls the discharge process to reduce degradation by managing the discharge and equalization of the capacitor, thereby extending its usable time as a backup power source.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrical double layer capacitor is continuously discharged during suspended state, then the voltage is maintained, but the characteristic degradation accelerates and usable time shortens
Solution Approach 1:
The discharge circuit operates periodically rather than continuously - it discharges the capacitor when voltage exceeds the threshold voltage during suspended state, then stops discharging when voltage drops below the threshold. This periodic discharge maintains voltage within acceptable ranges while avoiding continuous degradation from constant discharge current
Solution Approach 2:
The control method dynamically adjusts the discharge operation based on voltage parameter changes. When voltage rises above threshold during suspended state, discharge is activated; when voltage falls below threshold, discharge is stopped. This parameter-based control optimizes the balance between maintaining reliability and extending usable time
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 characteristic degradation of electrical double layer capacitors, ensuring a longer operational time and reliable backup power supply by monitoring and managing the capacitor's voltage and resistance values.
Implementation Method 1
an electrical double layer capacitor between the first node and the second node
Implementation Method 2
a discharging resistor connected between the first node and the ground
Data Source
AI summary
A power supply device includes a storage circuit including a first node connected to a power supply, a second node connected to a ground, and an electrical double layer capacitor between the first node and the second node; a discharge circuit including a discharging resistor connected between the first node and the ground; and a power supply controller configured to measure a voltage at the first node and control the discharge circuit. The power supply controller is configured to perform a procedure of starting discharge of the storage circuit by the discharge circuit in response to detecting transfer to a suspended state, and stopping the discharge by the discharge circuit in a case in which the voltage at the first node is lower than a first standard voltage value.