Inverter module and electric compressor comprising same
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Solution Overview
Problem
Noise coupling between high voltage and low voltage parts in inverter modules degrades electromagnetic compatibility, leading to inefficiencies in motor control and power conversion.
Innovation Solution
The inverter module is designed with a high voltage circuit unit generating DC voltages for motor driving and control, and a low voltage circuit unit for communication, with distinct circuit patterns on a board to prevent noise coupling, using switching mode power supplies and gate drivers to manage voltage levels and separate components to avoid electrical overlap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high voltage circuit pattern and low voltage circuit pattern are disposed to cross each other, then electrical connection is achieved, but noise coupling occurs between high voltage and low voltage parts
Solution Approach 1:
The circuit board is divided into distinct high voltage and low voltage regions with separate circuit patterns. The high voltage circuit unit and low voltage circuit unit are spatially segmented to prevent noise coupling, with each region handling only its designated voltage level and connected through isolated interfaces.
Solution Approach 2:
The harmful high voltage noise is extracted and isolated from the low voltage communication circuits. By separating the high voltage circuit pattern from the low voltage circuit pattern and using isolated connectors, the noise source is removed from the sensitive communication paths.
2Ease of manufacture
If low voltage connector and low voltage circuit part are disposed close to each other, then electrical connection is simplified, but electromagnetic compatibility is degraded
Solution Approach 1:
An isolated connector serves as an intermediary between the low voltage circuit unit and external devices. This connector is specifically designed with electrical isolation to prevent noise transmission while maintaining communication functionality, acting as a buffer between potential noise sources and sensitive circuits.
3Device complexity
If elements using different voltages are disposed close to each other, then device complexity is reduced, but noise coupling occurs between elements of different voltages
Solution Approach 1:
Different regions of the circuit board are assigned different voltage levels and circuit functions. The high voltage region contains only high voltage circuit units while the low voltage region contains only low voltage circuit units, creating localized functional zones that prevent cross-voltage noise coupling.
Data Source
AI summary
An inverter module according to an embodiment of the present invention comprises: a high voltage circuit unit which generates an inverter control voltage and a motor driving voltage by using a first DC voltage; a high voltage circuit pattern which electrically connects the high voltage circuit unit; a low voltage circuit unit which communicates with an external device by using a second DC voltage having a smaller magnitude than the first DC voltage; and a low voltage circuit pattern which electrically connects the low voltage circuit unit. The high voltage circuit pattern and the low voltage circuit pattern are spaced apart from each other.