Isolated Voltage Conversion Circuit Using Capacitive Coupling
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Solution Overview
Problem
Current electronic devices face limitations in efficiently delivering power due to challenges in isolated voltage conversion, particularly in isolating voltage conversion within electronic devices, which affects the reliability and efficiency of power delivery.
Innovation Solution
A system comprising a boost circuit, capacitive circuit, and converter circuit that generates isolated AC and DC signals, eliminating the need for large components and step-down/isolation transformers, thereby enhancing circuit efficiency and footprint reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional step-down/isolation transformers are used for isolated voltage conversion, then voltage isolation and conversion are achieved, but the device footprint and component size increase significantly
Solution Approach 1:
The patent replaces the mechanical/physical transformer system with an electronic switching system consisting of MOSFETs, diodes, and capacitors that perform voltage conversion through capacitive coupling rather than magnetic transformation, thereby eliminating the need for large transformer components
Solution Approach 2:
The invention changes the operating parameters by using high-frequency switching of MOSFETs to generate AC signals from DC inputs, enabling voltage conversion through capacitive reactance rather than transformer turns ratio, which allows for compact component sizing
2Adaptability or versatility
If multiple voltage conversion stages are implemented, then multiple isolated DC voltages are generated, but the circuit complexity increases
Solution Approach 1:
The patent designs a universal voltage conversion module that can be replicated to generate multiple isolated DC voltages. Each module uses the same topology (MOSFET, diode, capacitor configuration) but with different capacitor values and switching parameters to produce different output voltages, reducing design complexity through standardization
Solution Approach 2:
The voltage conversion system is divided into independent modular stages, where each stage processes one DC input to one isolated DC output through separate AC coupling paths. This segmentation allows each module to be designed and analyzed independently while maintaining overall system functionality
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 achieves efficient isolated voltage conversion by generating isolated AC and DC signals, improving power delivery to electronic devices while reducing the need for large components and simplifying the circuit design.
Implementation Method 1
The capacitive circuit may be electrically coupled to the boost circuit and may receive the intermediate AC signal
Implementation Method 2
The capacitive circuit may also generate an isolated AC signal at the first AC voltage based on the intermediate AC signal at the first AC voltage
Data Source
AI summary
A system includes a boost circuit, a capacitive circuit, and a converter circuit. The boost circuit receives a DC signal at a first DC voltage and generates an intermediate AC signal at a first AC voltage based on the DC signal. The capacitive circuit receives the intermediate AC signal at the first AC voltage and generates an isolated AC signal at the first AC voltage based on the intermediate AC signal at the first AC voltage. The converter circuit receives the isolated AC signal at the first AC voltage; generates a first isolated DC signal at a second DC voltage based on the isolated AC signal at the first AC voltage; and generates a second isolated DC signal at a third DC voltage based on the first isolated DC signal at the second DC voltage. The third DC voltage may be less than the second DC voltage.