Non-Linear Capacitor Circuit for Asymmetric Charge-Discharge Timing
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Solution Overview
Problem
Power-on delay circuits face challenges with non-linear capacitors, where the discharging time is often significantly longer than the delay time, making it difficult to reduce the turned on delay time without adverse impacts.
Innovation Solution
A non-linear capacitor design featuring a capacitor connected through first and second amplifier devices, allowing for varying effective charging and discharging capacitance by altering the conduction of these devices, resulting in opposite trends for charging and discharging currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the power cycle is rapidly shortened to reduce turned on delay time, then the turned on delay time is reduced, but this method is difficult to implement and may cause very disadvantageous impact in some cases
Solution Approach 1:
The patent applies dynamics by making the capacitor's effective capacitance value changeable during different operational phases. The capacitor transitions between different capacitance states (first capacitance value during charging, second capacitance value during discharging) controlled by switching devices, enabling flexible adjustment of charging and discharging times without physically modifying the capacitor structure.
Solution Approach 2:
The patent changes the electrical parameter (capacitance value) of the capacitor dynamically based on operational phase. By controlling the switching devices to connect different portions of the capacitor or change its effective capacitance, the system achieves different time constants for charging and discharging, resolving the contradiction between delay time reduction and implementation feasibility.
2Reliability
If the discharging time is made at least as long as the turned on delay time for non-linear capacitors, then the capacitor maintains stable operation, but the discharging time becomes much longer than necessary, reducing circuit efficiency
Solution Approach 1:
The patent makes the capacitor's effective capacitance dynamic rather than fixed. During discharging phase, the switching devices reconfigure the circuit to present a different effective capacitance value than during charging, enabling independent control of discharging time to be shorter while maintaining stability during charging.
Solution Approach 2:
The patent segments the capacitor's functionality by using switching devices to selectively connect different portions of the capacitor or change its effective capacitance based on operational phase. This segmentation allows the capacitor to exhibit different electrical characteristics during charging versus discharging, resolving the contradiction between stability and time efficiency.
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 design enables flexible configuration of charging and discharging times, allowing for efficient power management by varying the effective capacitance in response to charging and discharging needs.
Implementation Method 1
a first amplifier device and a second amplifier device, and an input and output node N1. The capacitor C1 connects to the input and output node N1 through the first amplifier device 10 and the second amplifier device 20
Data Source
AI summary
A non-linear capacitor includes a capacitor, a first and a second amplifier devices, and an input and output node for providing a charging current and a discharging current. The capacitor connects to the input and output node through the first and the second amplifier devices. When the capacitor is charging, one of the first and the second amplifier devices is conducted to vary the charging current, and the capacitor is charged by the varied charging current. When the capacitor is discharging, the other of the first and the second amplifier devices is conducted to vary the discharging current, and the capacitor is discharged by the varied discharging current. A variation trend of the charging current is opposite to a variation trend of the discharging current.