Capacitor Charging Circuit With Dynamic Bus-Voltage Tracking
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Solution Overview
Problem
Existing optical alarm devices face energy waste and alarm delay due to inefficient charging of capacitors, which are charged to high voltages exceeding the requirements of the light-emitting unit, leading to excessive current draw and prolonged charging times.
Innovation Solution
A charging circuit and method that dynamically adjusts the capacitor voltage to a level equal to the sum of the line voltage and a predetermined difference, ensuring the capacitor maintains a voltage greater than the line voltage without exceeding the maximum, using a line voltage detection circuit, boost circuit, and controller to manage charging based on real-time line voltage fluctuations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the capacitor voltage is charged to a high level to ensure sufficient energy for the light-emitting unit, then the light-emitting unit can operate reliably, but energy waste increases and charging time is prolonged
Solution Approach 1:
The patent implements dynamic voltage adjustment by detecting the actual line voltage and dynamically setting the capacitor charging voltage accordingly. The controller adjusts the charging voltage to be line voltage plus a predetermined difference, making the charging process adaptive rather than static. This resolves the contradiction by charging to the minimum necessary voltage level rather than a fixed high voltage, reducing energy waste while ensuring reliable operation.
Solution Approach 2:
The patent introduces a line voltage detection circuit that provides feedback about the actual line voltage to the controller. This feedback mechanism allows the system to adjust the capacitor charging voltage in real-time based on the detected line voltage, ensuring the capacitor is charged to the optimal voltage level rather than a fixed high voltage, thereby reducing energy waste while maintaining reliability.
2Reliability
If the capacitor voltage is charged to a high level to ensure sufficient energy for the light-emitting unit, then the light-emitting unit can operate reliably, but alarm delay increases
Solution Approach 1:
The dynamic voltage adjustment mechanism allows the capacitor to be charged to the minimum necessary voltage level rather than a fixed high voltage. This reduces the charging time significantly while ensuring the capacitor has sufficient energy for the light-emitting unit to operate reliably during the alarm, thereby resolving the time-reliability contradiction.
Solution Approach 2:
The patent changes the charging voltage parameter from a fixed high voltage to a variable voltage that adapts to the line voltage conditions. By adjusting this parameter dynamically, the system achieves faster charging times while maintaining the reliability required for proper light-emitting unit operation during alarm conditions.
3Power
If the capacitor voltage is charged to a high level, then the charging current during light-emitting unit operation can be controlled, but the capacitor voltage exceeds the light-emitting unit requirements causing energy waste
Solution Approach 1:
The patent applies partial action by charging the capacitor to only the necessary voltage level (line voltage plus predetermined difference) rather than an excessively high voltage. This provides just enough voltage headroom to control the charging current during light-emitting unit operation without the excessive energy waste associated with charging to a much higher voltage level.
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
Reduces energy waste and alarm delay by optimizing capacitor charging, ensuring efficient operation and preventing large currents, while maintaining the required light intensity of the light-emitting unit.
Implementation Method 1
a boost circuit, which is electrically connected to the charging bus and performs voltage boosting, so as to charge the capacitor with the boosted voltage
Data Source
AI summary
Various embodiments of the teachings herein include a charging circuit to charge a capacitor of an optical alarm device, connected between the capacitor and a charging bus. The capacitor supplies power to a light-emitting unit. The charging circuit comprising: a voltage detection circuit to detect a first voltage of the charging bus; a boost circuit connected to the charging bus to perform voltage boosting, to charge the capacitor with the boosted voltage; and a controller. The controller controls charging the boost circuit to the capacitor, so the voltage of the capacitor is equal to a second voltage after the light-emitting unit emits light at a target light intensity. The second voltage is equal to the sum of the first voltage and a predetermined difference.