Multiple Output Rectifier Using Comparator-Based Active Control
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Solution Overview
Problem
Existing wireless charging receivers require additional inductive DC-DC converters and discrete components, which increase cost and complexity, and linear DC-DC converters have low power conversion efficiency, especially in high conversion ratios.
Innovation Solution
A multiple output rectifier using a comparator-based active rectification circuit that generates stable output voltages without additional DC-DC converters or discrete components, by controlling the turning-on times of transistors to stabilize output voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an inductive DC-DC converter is used to stabilize DC voltage, then output voltage stability is improved, but device complexity and cost increase due to requiring several discrete inductor or capacitor components
Solution Approach 1:
The patent merges the rectification function and voltage stabilization function into a single integrated circuit. The comparator-based active rectification circuit directly generates multiple stable output voltages without requiring separate inductive DC-DC converter stages, thereby combining multiple functions into one unified structure and eliminating the need for discrete inductors and capacitors.
Solution Approach 2:
The comparator-based active rectification circuit is designed to provide multiple output voltages simultaneously (e.g., 5V, 3.3V, 1.8V) through a single circuit structure. This multi-functional approach allows the circuit to serve as both a rectifier and a voltage regulator, eliminating the need for separate DC-DC converter components for each voltage level.
2Device complexity
If a linear DC-DC converter is used to avoid discrete components, then device complexity is reduced, but power conversion efficiency deteriorates especially in high conversion ratio
Solution Approach 1:
The patent replaces the traditional linear DC-DC conversion mechanism with a comparator-based active rectification mechanism. Instead of using linear regulators that dissipate excess voltage as heat, the invention uses comparators to actively control the rectification process, achieving both component integration and high efficiency by switching between discrete conduction states rather than linear operation.
Solution Approach 2:
The invention changes the operating parameters of the rectification process by using comparator-based voltage comparison and control. The circuit dynamically adjusts its operation based on voltage threshold comparisons, enabling efficient voltage conversion without the energy losses inherent in linear conversion methods, while maintaining integration without discrete components.
3Reliability
If additional DC-DC converter and discrete components are used, then output voltage stability is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines multiple voltage stabilization functions into a single integrated comparator-based active rectification circuit. By merging the rectification and voltage regulation functions that would traditionally require separate DC-DC converters and discrete components, the invention reduces component count and assembly complexity, thereby lowering manufacturing costs while maintaining stable multi-voltage outputs.
Data Source
AI summary
A multiple output rectifier includes a comparator-based active rectification circuit and a controller, wherein the controller is coupled to the comparator-based active rectification circuit. The comparator-based active rectification circuit is used for generating and outputting each output voltage of a plurality of output voltages according to an input voltage, the each output voltage, and a control signal corresponding to the each output voltage. The controller is used for generating the control signal according to the each output voltage and a reference voltage corresponding to the each output voltage.