DC-DC Converter Snubber Circuit for Overvoltage Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Vehicles using fossil fuels emit harmful pollutants and contribute to global warming, necessitating the development of clean energy alternatives like hybrid electric and electric vehicles, which require efficient DC-DC converters to manage voltage between high-voltage and low-voltage batteries.
Innovation Solution
A DC-DC converter design incorporating a transformer, switches, rectifying diodes, and a snubber circuit to prevent overvoltage damage, featuring a series-connected diode and inductor configuration with parallel capacitors to manage voltage transitions effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a DC-DC converter is used to convert high-voltage battery power to low-voltage battery power, then power conversion efficiency is improved, but overvoltage may damage the rectifying diodes
Solution Approach 1:
The patent applies beforehand cushioning by introducing a snubber circuit connected in parallel with the rectifying diodes before overvoltage can occur. This snubber circuit includes capacitors and resistors that absorb voltage spikes and protect the diodes from damage during the power conversion process, allowing efficient operation without compromising reliability.
2Reliability
If multiple capacitors are connected in parallel with diodes in the snubber circuit, then overvoltage protection is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the snubber circuit into multiple independent RC branches, with each capacitor-resistor pair connected in parallel with specific diodes. This segmentation allows targeted protection for different diodes while maintaining modular simplicity, balancing protection effectiveness with circuit manageability.
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 solution effectively converts high-voltage battery power to low-voltage battery power, enhancing the reliability and efficiency of electric vehicle power systems while minimizing damage to components.
Implementation Method 1
a transformer configured to transform the first voltage to the second voltage
Implementation Method 2
The secondary coil is configured to induce second current according to a magnetic field produced by the primary coil
Implementation Method 3
at least one rectifying diode configured to rectify alternate current (AC) output from the transformer
Data Source
AI summary
A direct current (DC)-DC converter is for a vehicle for converting a first voltage output of a first battery to a second voltage output of a second battery. The DC-DC converter includes a transformer, at least one switch, at least one rectifying diode, and a snubber circuit. The transformer is configured to transform the first voltage to the second voltage. The at least one switch is configured to control a first current input to the transformer from the first battery. The at least one rectifying diode is configured to rectify an alternate current (AC) output from the transformer. The snubber circuit is configured to prevent overvoltage from being applied to the at least one rectifying diode.