Switching Power Source Current Calibration Apparatus
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Solution Overview
Problem
Conventional switching power source circuits experience sub-harmonic oscillations and increased errors due to variations in manufacturing conditions, temperature, and voltage, which affect the accuracy of current feedback control.
Innovation Solution
An adjusting apparatus that includes a capacitor, a current source circuit, a switch, and control units to measure and set a designated current value, ensuring the capacitor is charged and discharged to maintain a constant current addition, thereby stabilizing the output current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current is added to the output current supplied from the switching power source circuit to prevent sub-harmonic oscillation, then sub-harmonic oscillation is prevented, but errors increase due to variations in manufacturing conditions, device temperature, and voltages during use
Solution Approach 1:
The patent changes the parameter of current addition by introducing a calibration process that measures the actual charging time of a capacitor with the added current and adjusts the current amount accordingly. This compensates for variations in manufacturing conditions, temperature, and voltage by dynamically adjusting the current parameter based on actual measurements rather than using fixed predetermined values
Solution Approach 2:
The patent implements feedback by measuring the charging time of a capacitor when current is added and using this measurement to calculate and adjust the designated value for current addition. The measured charging time is fed back to the calculating unit, which then adjusts the current amount to achieve a predetermined charging time, creating a closed-loop control system that compensates for environmental variations
2Stability of the object's composition
If predetermined current is added to prevent sub-harmonic oscillation, then oscillation is suppressed, but the accuracy of output current control decreases due to environmental variations
Solution Approach 1:
The patent performs preliminary calibration by measuring the charging time of a capacitor with the added current before normal operation. This preliminary measurement allows the system to calculate and store the corrected designated value for current addition, which is then used during actual operation to maintain both stability and accuracy under varying environmental conditions
Solution Approach 2:
The system performs self-calibration by automatically measuring its own current addition characteristics using the capacitor charging method and adjusting its own parameters without external intervention. The calculating unit uses the measured charging time to self-correct the designated current value, enabling the system to compensate for manufacturing variations and environmental changes autonomously
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 apparatus reduces errors in current addition and stabilizes the operation of the switching power source circuit by maintaining a constant current, even with variations in manufacturing, temperature, and voltage, preventing sub-harmonic oscillations.
Implementation Method 1
a capacitor that is charged by output current output from a switching power source circuit
Implementation Method 2
a measuring unit that measures a time period from a time when the second control unit switches the switch to the charging side until a time when an electric potential difference of the capacitor exceeds a threshold value
Data Source
AI summary
An adjusting apparatus sets a designated value of a current source circuit to be a predetermined value, and causes discharging of a capacitor to end by switching a switch to a discharging side when the capacitor is not being charged by current output from a switching power source circuit. After the discharging of the capacitor ends and the designated value is set, the adjusting apparatus causes the capacitor to be charged by switching the switch to a charging side. The adjusting apparatus further measures a time period from the time when the switch is switched to the charging side until an electric potential difference of the capacitor exceeds a threshold value. Based on the measured time period and the predetermined value, the adjusting apparatus calculates the designated value such that the measured time period is a predetermined time period.