AC Motor Drive Bidirectional Chopper Circuit Voltage Adaptation
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Solution Overview
Problem
Existing AC motor drive devices with bidirectional step-up/step-down chopper circuits face inefficiencies in charge and discharge operations due to voltage limitations, leading to suboptimal energy use and potential damage from abnormal conditions.
Innovation Solution
An AC motor drive device with a power storage system that includes a step-up/step-down bidirectional chopper circuit with two switching elements and a choke coil, where a circuit switching element dynamically switches between first and second chopper circuits to perform charge and discharge operations regardless of bus voltages, improving energy efficiency and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a bidirectional step-up/step-down chopper circuit is used for charge and discharge control, then charge and discharge operations can be performed, but the operation is limited by bus voltage conditions and energy efficiency deteriorates
Solution Approach 1:
The patent applies dynamics by making the circuit configuration changeable through a circuit switching element that dynamically switches between first and second chopper circuits based on voltage conditions. This dynamic reconfiguration allows the system to adapt to different bus voltage conditions and maintain optimal energy efficiency during charge and discharge operations.
Solution Approach 2:
The patent changes the circuit configuration parameter by switching between two different chopper circuit arrangements. The circuit switching element alters the connection topology between the switching elements and choke coils, thereby changing the electrical parameters of the system to match different operating conditions and improve energy efficiency.
2Adaptability or versatility
If two switching circuits are connected in series to perform charge and discharge regardless of bus voltages, then charge and discharge operations can be performed under any voltage conditions, but the circuit configuration becomes complicated and control becomes complicated
Solution Approach 1:
The patent achieves universality by designing a circuit switching element that can configure the same two switching elements and choke coils into two different functional arrangements (first and second chopper circuits). This multi-functional approach allows the system to handle various voltage conditions using a single unified circuit structure rather than requiring separate circuits for different operations.
Solution Approach 2:
The patent uses dynamic switching to reconfigure the circuit topology based on operating conditions. The circuit switching element dynamically changes the connection arrangement of the switching elements and choke coils, allowing the system to adapt to different voltage conditions without requiring multiple fixed circuit configurations, thereby simplifying the overall design.
3Adaptability or versatility
If two switching circuits are connected in series to perform charge and discharge regardless of bus voltages, then charge and discharge operations can be performed under any voltage conditions, but power loss occurs in each switching circuit and energy conversion efficiency decreases
Solution Approach 1:
The patent dynamically switches between two different circuit configurations to minimize power loss. By selecting the appropriate chopper circuit arrangement based on voltage conditions, the system optimizes the current path and reduces unnecessary power dissipation in the switching elements and choke coils, thereby improving energy conversion efficiency.
Solution Approach 2:
The patent changes the circuit configuration parameter to optimize energy efficiency. By switching between first and second chopper circuits, the system adjusts the electrical parameters such as current flow paths and voltage distribution, thereby minimizing power loss in the switching elements and improving overall energy conversion efficiency.
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 enables efficient charge and discharge operations across varying bus voltages, enhancing energy use efficiency and ensuring safe operation by preventing damage from abnormal conditions.
Implementation Method 1
a step-up/step-down bidirectional chopper circuit including two switching elements in series and a choke coil whose one end is connected to a series connection terminal of the two switching elements
Data Source
AI summary
A circuit switching element is provided that switches a step-up/step-down bidirectional chopper circuit, arranged between a DC bus and a power storage element, to a first chopper circuit or to a second chopper circuit, whose step-up and step-down characteristics are in a complementary relation. The first and second chopper circuits are used together at a time of charge and discharge. Accordingly, an AC motor drive device having mounted therein a power storage system is obtained, in which the power storage system can perform charge and discharge to and from the power storage element, regardless of a bus voltage and can increase energy use efficiency.