Asymmetric DC/AC Inverter Capacitance for Partial Load Efficiency
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Solution Overview
Problem
Existing alternating current power supply devices with multiple DC/AC inverters are inefficient under partial loads, leading to increased complexity, cost, and reduced power conversion efficiency, as they require numerous inverters to handle varying loads, making them uneconomical and complex.
Innovation Solution
A power supply system with a direct current power source and multiple parallel DC/AC converters of varying capacities, controlled by a controller to optimize inverter usage based on detected load power, allowing for efficient operation across a wide range of loads by selecting the appropriate combination of converters to operate, thereby increasing power conversion efficiency and reducing the number of inverters needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple DC/AC inverters are used to handle varying loads, then the power supply can operate under different load conditions, but the device complexity and cost increase
Solution Approach 1:
The patent divides the inverter system into multiple independent DC/AC inverters with different rated capacities. Each inverter operates independently and can be selectively activated based on the load demand. This segmentation allows the system to handle varying loads efficiently without requiring a single complex inverter, thereby resolving the contradiction between adaptability and device complexity.
2Loss of energy
If multiple DC/AC inverters are used to maintain efficiency under partial loads, then the power conversion efficiency improves, but the number of components and cost increase
Solution Approach 1:
The patent assigns different rated capacities to different inverters, creating local quality variations in the system. Each inverter is optimized for specific load ranges based on its capacity. The control unit selects which inverter to operate based on the current load demand, ensuring that the operating inverter works within its optimal efficiency range. This resolves the contradiction by maintaining high power conversion efficiency across partial loads without requiring an excessive number of inverters.
3Ease of manufacture
If the same capacity inverters are used in parallel, then the system is simpler to design, but the power conversion efficiency drops under partial loads
Solution Approach 1:
The patent employs asymmetric inverter capacities rather than identical capacities for all inverters. By configuring inverters with different rated capacities (e.g., one inverter with capacity W/2, another with W/6, etc.), the system can more precisely match the load demand. This asymmetric configuration allows better efficiency under partial loads compared to symmetric configurations, while the control unit manages the complexity of selecting the appropriate inverter based on load conditions.
Data Source
AI summary
An alternating current power supply device comprises a DC power supply for generating direct current power, a plurality of, e.g., three first DC/AC inverter to third DC/AC inverter which are arranged in parallel and electrically connected to the DC power supply, for converting the direct current power generated by the DC power supply into alternating current power and supplying the alternating current power to a load, and a control unit for controlling the driving of the first DC/AC inverter to the third DC/AC inverter. The capacitance A of the first DC/AC inverter is set to W/6, the capacitance A of the second DC/AC inverter is set to W/3, and the capacitance A of the third DC/AC inverter is set to W/2.