Power Conversion Controller Dynamic Ramping Slope Adjustment
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Solution Overview
Problem
Conventional power conversion systems for LED lighting struggle to achieve high efficiency, power factor, and low total harmonic distortion, often failing to meet the requirements of >90% efficiency, >0.9 power factor, and <10% total harmonic distortion.
Innovation Solution
A system and method for current regulation in power conversion systems, involving a controller with terminals configured to receive input signals and adjust the on-time period and ramping slope of drive signals to the power switch, based on feedback and compensation signals, to optimize current flow through the primary winding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If conventional power conversion systems are used for LED lighting, then the system structure is simple, but the efficiency is low and cannot achieve >90% efficiency requirement
Solution Approach 1:
The patent implements dynamic adjustment of the ramping slope in the controller based on real-time detection of primary current and bulk voltage. The ramping slope is not fixed but varies dynamically to optimize the on-time period calculation, enabling the system to achieve high efficiency across different operating conditions while maintaining adaptive control.
Solution Approach 2:
The controller changes the ramping slope parameter according to the detected primary current and bulk voltage conditions. By adjusting this parameter dynamically, the system optimizes the PWM duty cycle calculation to maximize efficiency while adapting to varying input voltages and load conditions.
2Adaptability or versatility
If conventional power conversion systems are used, then the device structure is simple, but the power factor is low and cannot achieve >0.9 power factor requirement
Solution Approach 1:
The system employs feedback mechanisms where the controller continuously detects the primary current through a sensing resistor and the bulk voltage through a voltage divider. This feedback information is used to dynamically adjust the ramping slope and optimize the on-time period, enabling power factor correction to achieve >0.9 while adapting to varying operating conditions.
Solution Approach 2:
The controller dynamically adjusts the ramping slope based on real-time feedback of primary current and bulk voltage. This dynamic adaptation enables the system to maintain high power factor across different operating points by optimizing the switching timing and duty cycle in response to changing conditions.
3Manufacturing precision
If conventional power conversion systems are used, then the system is simple, but the total harmonic distortion is high and cannot achieve <10% THD requirement
Solution Approach 1:
The controller uses feedback from primary current detection and bulk voltage sensing to continuously optimize the ramping slope. This closed-loop control enables precise regulation of the output current to LEDs, ensuring accurate current control and low total harmonic distortion by adapting to variations in input voltage and load conditions.
Solution Approach 2:
The system changes the ramping slope parameter dynamically based on detected operating conditions. This parameter adjustment enables precise control of the PWM duty cycle, improving current regulation accuracy and reducing harmonic distortion while adapting to different input voltages and LED forward voltage variations.
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 enhances the regulation of output currents, improving efficiency, power factor, and reducing total harmonic distortion, thereby meeting the desired performance standards for LED lighting applications.
Implementation Method 1
The auxiliary winding 116 charges the capacitor 106 through the diode 108 when the switch 128 is opened (e.g., being turned off) in response to the drive signal 156
Implementation Method 2
a transformer 110 including a primary winding 112, a secondary winding 114 and an auxiliary winding 116
Data Source
AI summary
Systems and methods are provided for regulating a power conversion system. An example system controller includes a first controller terminal and a second controller terminal. The first controller terminal is configured to receive a first signal associated with an input signal for a primary winding of a power conversation system. The second controller terminal is configured to output a drive signal to a switch to affect a first current flowing through the primary winding of the power conversion system, the drive signal being associated with an on-time period, the switch being closed during the on-time period. The system controller is configured to adjust a duration of the on-time period based on at least information associated with the first signal.