Switching Power Converter Peak Charge Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Control in 'peak charge' mode for switching power converters faces challenges such as power limitation issues, compatibility with impedance networks, and instability due to varying reference signals, particularly when dealing with high-voltage spikes and rapid current changes.
Innovation Solution
Incorporating a conversion unit within the control device that divides the reference power by the input voltage to derive a reference charge, along with a power limiter and charge limiter, and using a diode and low-pass filter to manage voltage spikes, allowing for a dynamic reference charge that adjusts to input voltage conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If peak charge control mode is used to enable unidirectional operation and simplify control, then ease of operation is improved, but power limitation precision and stability deteriorate due to varying reference signals and high-voltage spikes
Solution Approach 1:
The patent transforms the reference signal from a charge reference to a power reference that varies with input voltage. The conversion unit divides the power reference by the input voltage to generate an adaptive charge reference, changing the control parameter from fixed to dynamic based on operating conditions
Solution Approach 2:
The patent implements feedback through the conversion unit that continuously monitors input voltage and adjusts the charge reference accordingly. The power limiter receives feedback from the divider output and adjusts the reference power to maintain precise limitation despite voltage variations
2Device complexity
If a fixed reference charge is used in peak charge control, then device complexity is reduced, but adaptability to varying input voltage conditions deteriorates
Solution Approach 1:
The patent introduces dynamics into the control system by making the reference charge variable rather than fixed. The conversion unit dynamically adjusts the reference charge based on real-time input voltage measurements, allowing the system to adapt to varying operating conditions
Solution Approach 2:
The patent performs preliminary action by pre-calculating the appropriate reference charge before the switching cycle begins. The conversion unit computes the scaled reference charge based on current input voltage, preparing the adaptive reference in advance for the control cycle
3Speed
If high-voltage spikes are allowed to pass through the control circuit, then response speed is improved, but reliability deteriorates due to overvoltage conditions
Solution Approach 1:
The patent applies beforehand cushioning by placing the low-pass filter in the voltage spike detection path before the spikes can cause damage. The filter attenuates high-frequency voltage spikes in advance, protecting downstream components while maintaining the ability to respond to legitimate voltage changes
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 approach enables precise power and current limitation, improves impedance matching with the grid, and stabilizes the converter operation by filtering high-voltage spikes, preventing overvoltage and ensuring consistent power delivery.
Implementation Method 1
using a diode and low-pass filter to manage voltage spikes, allowing for a dynamic reference charge that adjusts to input voltage conditions
Data Source
AI summary
A converter comprising a switch and a control device in “peak charge” mode for generating a command of the switch, and which comprises an error corrector between an output voltage and a reference voltage, a comparison means between a reference charge and a measured charge resulting from the time integration of the current circulating in the switch to develop the command signal, the error signal at the output of the error corrector being a reference power, the control device comprising a conversion unit comprising a divider dividing the reference power by the input voltage to obtain the reference charge.