Parallel Switching Inverter Modules for Air Conditioner Motor Drive
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Solution Overview
Problem
Conventional motor drive apparatuses face challenges in reducing costs while increasing current capacity, as reducing chip area to improve yield leads to decreased current capacity, making it difficult to achieve both cost reduction and current increase simultaneously.
Innovation Solution
The motor drive apparatus employs inverter modules with multiple switching element pairs connected in parallel, each pair consisting of two switching elements in series, and a control unit generating PWM signals to drive these modules, allowing for high current capacity and cost-effective manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the chip area of switching elements is reduced to improve yield and reduce cost, then the manufacturing cost decreases, but the current capacity of the switching elements decreases
Solution Approach 1:
The patent divides the switching element function into multiple smaller switching elements connected in parallel. Instead of using a single large switching element with high current capacity, the invention uses multiple smaller switching elements (e.g., three switching elements in parallel) that each have lower individual current capacity but collectively provide the required total current capacity. This segmentation allows each chip to be smaller and more manufacturable while achieving the same overall electrical performance.
Solution Approach 2:
The patent combines multiple switching elements in parallel to achieve the required current capacity. By merging the electrical functions of multiple smaller switching elements, the system achieves the same total current handling capability as a single large switching element would provide, while benefiting from the smaller individual chip sizes that improve yield and reduce manufacturing cost.
2Quantity of substance
If multiple switching elements are connected in parallel to increase current capacity, then the current capacity increases, but the device complexity increases
Solution Approach 1:
The patent makes the switching elements and their supporting components (such as diodes and capacitors) multi-functional by having them serve both as individual switching elements and as part of the overall parallel configuration. The same physical components are used for both individual switching functions and for achieving the combined current capacity, reducing the need for additional specialized components and simplifying the overall device structure.
Data Source
AI summary
A motor drive apparatus driving a motor as a three-phase motor converting direct power into three-phase alternating power, includes: inverter modules equivalent in number to phases of the motor; and a control unit generating PWM signals used to drive the inverter modules with PWM. The inverter modules each include a plurality of switching element pairs connected in parallel, each of the switching element pairs including two switching elements connected in series.