Boost Converter Floating Capacitor Impedance Control
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Solution Overview
Problem
Existing boost converters face challenges in reducing common-mode current due to difficulties in maintaining balanced conditions between inductance values of inductors and capacitance values of floating capacitors, leading to insufficient reduction of common-mode current, especially in mass production scenarios.
Innovation Solution
A boost converter configuration that includes a switching element connected to inductors, a controller to manage the switching, and a thermally and electrically conductive mounting member with insulating capacitors formed between the mounting member and a reference potential member, increasing impedance and reducing common-mode current flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If balanced conditions between inductance values and capacitance values are maintained, then common-mode current is reduced, but manufacturing difficulty increases due to precision requirements
Solution Approach 1:
The patent extracts the harmful floating capacitors from the circuit by providing a dedicated discharge path through resistors connected to the reference potential member. This allows the floating capacitors to be discharged without requiring balanced conditions, thereby eliminating common-mode current while avoiding stringent manufacturing precision requirements.
Solution Approach 2:
The patent introduces resistors as intermediary components that provide a discharge path for the floating capacitors. These resistors act as mediators between the floating capacitors and the reference potential member, enabling controlled discharge and eliminating the need for precise balancing of inductance and capacitance values.
2Object-generated harmful factors
If floating capacitors are discharged through switching element voltage variation, then common-mode current flows to casing, but adding discharge path increases device complexity
Solution Approach 1:
The patent introduces resistors as intermediary components that provide a discharge path for the floating capacitors. These resistors act as mediators between the floating capacitors and the reference potential member, enabling controlled discharge and eliminating the need for precise balancing of inductance and capacitance values.
Solution Approach 2:
The patent merges the discharge path function with the existing circuit structure by connecting the resistors to the reference potential member, which is already part of the circuit. This integration approach adds minimal complexity while effectively providing a discharge path for the floating capacitors.
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 configuration effectively reduces common-mode current by increasing impedance in the electrical paths, minimizing interference with external devices, even when balanced conditions are not met, and maintaining efficient heat dissipation.
Implementation Method 1
the first and second floating capacitors are thereby formed between the mounting member and the reference potential member, which leads to an increased impedance of each electrical path from the boost circuit to the reference potential member
Implementation Method 2
A thermally and electrically conductive mounting member is provided for mounting the at least one switching element thereon
Data Source
AI summary
A boost converter capable of reducing a common-mode current that flows to the outside of a casing. In the converter, a boost circuit includes first and second inductors and at least one switching element electrically connected therebetween. A controller turns on and off the at least one switching element to boost an input voltage of the boost circuit. A first floating capacitor is formed between a first electrical path, which is at the same potential as a junction between the at least one switching element and the first inductor, and a mounting member coupled to a reference potential member with an insulator therebetween. A second floating capacitor is formed between a second electrical path, which is at the same potential as a junction between the at least one switching element and the second inductor, and the mounting member.