Wireless Charging Pulse Generator Controller
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Solution Overview
Problem
Existing power converter control systems using pulse width modulation (PWM) signals face limitations in dynamically adjusting power output to suit varying loads, as they rely on fixed frequency and amplitude PWM signals, which do not efficiently adapt to changing load conditions.
Innovation Solution
A controller system that includes multiple PWM modules, memory tables, and direct memory access (DMA) modules to generate and adjust PWM sequences in real-time, using feedback loops and analog-to-digital converters to modify PWM values based on load conditions, enabling dynamic power output adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If fixed frequency and amplitude PWM signals are used, then the control system is simple, but the system cannot efficiently adapt to changing load conditions
Solution Approach 1:
The patent implements dynamic PWM signal generation where the pulse width, frequency, and duty cycle are continuously adjusted based on real-time load conditions. The controller modifies PWM parameters dynamically rather than using fixed values, allowing the system to adapt to varying power demands while maintaining manageable complexity through systematic control architecture.
Solution Approach 2:
The system incorporates feedback mechanisms that monitor load conditions and use this information to adjust PWM signal parameters. The controller receives feedback about actual power consumption and load status, then modifies the PWM duty cycle and frequency accordingly, enabling adaptive control without requiring overly complex predictive modeling.
2Productivity
If PWM parameters are adjusted in real-time, then power output can match load demands, but the control system complexity increases
Solution Approach 1:
The controller is divided into functional modules including PWM generation units, feedback processing units, and parameter adjustment units. Each module handles specific aspects of real-time control, allowing independent optimization and simplifying the overall system architecture while maintaining high-speed real-time responsiveness for power adjustment.
Solution Approach 2:
The system pre-calculates and stores optimal PWM parameter sets for different load conditions in lookup tables. When a specific load condition is detected, the controller quickly retrieves the corresponding pre-computed parameters rather than calculating them in real-time, significantly reducing computation time and controller complexity while maintaining fast response capability.
3Adaptability or versatility
If multiple PWM sequences are generated, then different load conditions can be controlled, but the memory and processing requirements increase
Solution Approach 1:
The patent implements a universal PWM generation framework where a single set of base PWM sequences can be transformed into multiple specialized sequences through parameter modification. Rather than storing completely separate PWM tables for each load condition, the system uses a core set of sequences that can be adaptively adjusted via duty cycle and frequency modulation, reducing memory requirements while maintaining versatility.
Solution Approach 2:
The PWM control structure uses nested organization where general-purpose PWM sequences contain within them the capability to generate specific load-condition sequences through parameter nesting. Base sequences are stored in memory, and specific sequences are generated by nesting additional parameter layers (duty cycle modifiers, frequency scalers) onto the base sequences, reducing overall storage requirements through hierarchical organization.
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 system effectively adjusts power output to match varying load demands by modifying PWM sequences, improving efficiency and adaptability in powering electric motors, batteries, and other loads, including wireless charging applications.
Implementation Method 1
The feedback loop includes an analog to digital converter (ADC) to convert an analog signal to a digital data
Data Source
AI summary
A controller for generating a sequence of pulse is disclosed. The controller includes a plurality of pulse width modulation (PWM) modules. Each PWM Module configured to generate a first sequence of pulses and a second sequence of pulses each having a width that is modulated by a PWM value stored in a PWM register of the PWM module. Each PWM module includes two outputs. The first sequence of pulses is outputted on the first output and the second sequence of pulses is outputted on the second output. The controller also includes a memory having a plurality of memory tables and a plurality of direct memory access (DMA) modules. Each memory table configured to store PWM values to be written into the PWM register and each DMA module is coupled to a respective PWM module in the plurality of PWM modules and to a respective memory table in the plurality of memory tables and configured to write a PWM value from the memory table into the PWM register in response to a DMA trigger. The controller further includes a core coupled to the plurality of memory tables and configured to write the PWM values into the plurality of memory tables.