Low-Voltage Capacitor Power Loss Protection With Controlled Charging
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Solution Overview
Problem
Conventional auxiliary power supplies using high voltage capacitors result in large chip sizes and complex designs due to their high voltage and low capacitance per unit area, necessitating a simpler structure for power loss protection integrated circuits.
Innovation Solution
A power loss protection integrated circuit using a low voltage capacitor with a buck/boost converter and current control unit, where a current switching unit and interrupt device manage current flow to stabilize output voltage and enable energy storage in a low voltage capacitor for emergency power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If high voltage capacitors are used in auxiliary power supplies, then the voltage is maximized to increase total energy, but the chip size increases and design becomes complex
Solution Approach 1:
The patent changes the voltage parameter from high voltage to low voltage operation. By using a low voltage capacitor instead of a high voltage capacitor, the system achieves sufficient energy storage with a smaller capacitance value, which directly reduces the chip area required while maintaining the necessary energy supply capability for power loss protection
2Use of energy by moving object
If high voltage capacitors are used in auxiliary power supplies, then the voltage is maximized to increase total energy, but the design complexity increases
Solution Approach 1:
The patent simplifies the design by changing the operating voltage parameter to low voltage. This eliminates the need for complex high voltage device design, reduces the number of design constraints, and allows for a simpler circuit topology while still achieving the required energy storage through the low voltage capacitor
Solution Approach 2:
The patent uses a low voltage capacitor which is a simpler, more readily available component compared to high voltage capacitors. This substitution reduces design complexity and allows for easier integration into the power loss protection circuit without requiring specialized high voltage handling techniques
3Stability of the object's composition
If current is limited upon initial operation to ensure buck converter output voltage stability, then voltage stability is improved, but charging speed of the capacitor is reduced
Solution Approach 1:
The patent implements dynamic current control through the interrupt device, which adjusts the current limit based on the charging state of the capacitor. As the capacitor voltage approaches the buck converter output voltage, the current limit is gradually increased or removed, allowing the system to maintain voltage stability during initial charging while achieving faster charging speeds as the capacitor nears full charge
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 integrated circuit reduces chip area, simplifies design, and avoids defects from high voltages by using low voltage capacitors, enabling efficient energy storage and emergency power supply without a buck/boost converter and high current inductor.
Implementation Method 1
a power loss protection integrated circuit using a low voltage capacitor... an auxiliary power supply that stores energy in a capacitor when power is normally supplied... uses the energy pre-charged in the capacitor to supply emergency power
Data Source
AI summary
Disclosed is a power loss protection integrated circuit. In the power loss protection integrated circuit, an interrupt device is arranged on an electrical path between an output terminal of a buck converter and a low voltage capacitor such that a flow of current to the low voltage capacitor is limited upon initial operation to ensure stability of an output voltage of the buck converter, and after the passage of a predetermined time, the interrupt device is fully turned on when a voltage of the low voltage capacitor is almost the same as the output voltage of the buck converter such that the voltage of the low voltage capacitor is electrically connected to the output voltage of the buck converter.