Three-Phase Inverter Switch Control for Lower Power Loss
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Solution Overview
Problem
Existing three-phase inverters face inefficiencies due to high power losses in switch modules, particularly at high rotational speeds, which affect overall motor performance.
Innovation Solution
A device and method for controlling switch modules in three-phase inverters that determine the optimal number of switches to turn on based on total expected current, minimizing power losses through a current acquisition module, power loss determination, and turn-on switch number determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If all switches in the switch module are turned on to handle high current, then the current carrying capacity is improved, but the power loss increases
Solution Approach 1:
The patent applies dynamics by making the number of turned-on switches variable rather than fixed. The control device dynamically adjusts the number of switches to turn on based on the magnitude of the target current, using different switching patterns for different current ranges. This resolves the contradiction by adapting the system configuration to match the actual load requirements, ensuring high current carrying capacity when needed while minimizing power loss during normal operation.
2Loss of energy
If multiple switches are turned on in parallel, then the power loss is reduced through current distribution, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the switching control into distinct segments or stages based on current ranges. Different numbers of switches are turned on corresponding to different target current magnitudes, creating a segmented control strategy. This reduces complexity compared to continuous control while still achieving effective current distribution and power loss reduction through selective activation of switches.
3Productivity
If the number of turned on switches is increased, then the efficiency is improved, but the control complexity increases
Solution Approach 1:
The patent applies parameter changes by varying the number of active switches as a discrete parameter based on the target current magnitude. Instead of continuously adjusting switch parameters, the system changes the fundamental parameter of switch count in predefined steps corresponding to different current ranges. This simplifies control while maintaining efficiency improvements, as the control device only needs to select from a finite set of switching configurations rather than manage continuous adjustments.
Data Source
AI summary
A device and method for controlling a switch module, a three-phase inverter, and a program product are disclosed. The switch module includes a plurality of switches in parallel. The device for controlling the switch module includes (i) a current acquisition module configured to acquire a total expected current flowing through a plurality of switches of the switch module, (ii) a power loss determination module configured to determine a plurality of power losses of a plurality of switch combinations when at least one switch of the plurality of switches is turned on based on the total expected current acquired, and (iii) a turn-on switch number determination module configured to determine a target number of the switches turned on for the total expected current based on the plurality of power losses determined. The device for controlling the switch module according to the present disclosure is capable of changing the number of switches turned on in the plurality of switches according to the total expected current to achieve a lower switch power loss.