Voltage Converter Reactor Segmentation for Resonance Suppression
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Solution Overview
Problem
Conventional voltage converters for electric vehicles face issues with resonant frequency matching voltage fluctuations, leading to potential destruction of switching elements and reduced vehicle driving force due to excessive voltage application.
Innovation Solution
A voltage converter system with multiple reactors and switching elements, where the reactors are charged and discharged in a specific circuit configuration to separate the resonant frequency from voltage fluctuations, allowing independent phase control and reduced ripple in output power, thereby preventing excessive voltage application and maintaining efficient power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If the resonant frequency of the boost circuit matches the frequency of voltage fluctuation in the drive section, then the voltage converter operates efficiently, but excessive voltage is applied to the switching element causing potential destruction
Solution Approach 1:
The patent divides the single reactor into multiple reactors (first reactor and second reactor) connected in parallel. This segmentation allows independent control of each reactor's switching elements, enabling the system to avoid resonant frequency matching by adjusting individual reactor switching timing, thus preventing excessive voltage while maintaining power conversion efficiency.
Solution Approach 2:
The patent implements periodic switching control where the switching elements are turned on and off at specific timing intervals. By controlling the switching timing to coincide with or avoid the resonant frequency periods, the system maintains efficient operation while preventing dangerous voltage buildup that would occur at resonant frequency matching.
2Reliability
If the inverter power supply voltage is reduced when the frequency of voltage fluctuation approaches the resonant frequency, then the switching element is protected, but vehicle driving force is reduced
Solution Approach 1:
By segmenting the reactor into multiple parallel reactors with independently controllable switching elements, the system can selectively control which reactors are active. This allows the system to maintain full power output by distributing the load across multiple reactors rather than reducing overall voltage, while still protecting individual switching elements from excessive voltage stress.
Solution Approach 2:
The patent changes the switching timing parameters of the switching elements to avoid resonant frequency matching. By adjusting the switching frequency and timing parameters rather than reducing voltage amplitude, the system maintains full driving force while preventing the resonant conditions that would damage switching elements.
3Reliability
If multiple reactors are used in parallel, then the resonant frequency is separated from voltage fluctuation frequency, but the circuit complexity increases
Solution Approach 1:
The patent segments the reactor into multiple parallel reactors, which naturally separates the resonant frequency from the voltage fluctuation frequency. While this increases component count, the modular parallel configuration is simpler to implement and control than complex series or transformer-based solutions, as each reactor can be controlled independently with standard switching circuits.
Solution Approach 2:
The multiple reactors serve dual functions: they provide the necessary inductance for voltage conversion while simultaneously acting as frequency separation elements to avoid resonance. This multi-functionality reduces the need for additional dedicated resonance suppression components, thereby limiting the increase in overall circuit complexity.
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 stabilizes DC power supply voltage, suppresses resonance phenomena, reduces magnetic noise, and avoids efficiency losses during low output conditions by independently controlling reactor phases and timing of peak current, ensuring stable and efficient power delivery to electric vehicles.
Implementation Method 1
The first circuit is connected such that the direct-current power supply charges the N reactors when the at least one switching element is turned ON. The second circuit is connected such that the N reactors discharge power to the electrical load when the at least one switching element is turned OFF.
Data Source
AI summary
A voltage converter includes a first circuit and a second circuit. The first circuit includes two or more reactors and at least one switching element. One terminal of each of the reactors is connected in parallel with respect to a power source. The at least one switching element is connected to the other terminal of each of the reactors. The second circuit includes at least one rectifier of which one terminal is connected to the electrical load. The second circuit shares with the first circuit the at least one switching element connected to the at least one rectifier. The first circuit is connected such that the power source charges the respective reactors when the at least one switching element is turned ON. The second circuit is connected such that the reactors discharge power to the electrical load when the at least one switching element is turned OFF.