Power Conversion Equipment for High-Speed Motor Operation
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Solution Overview
Problem
Conventional power conversion equipment for hybrid and electric vehicles faces challenges in driving motors at high speeds without flux-weakening control, leading to increased converter capacity costs and tradeoffs between motor speed and converter capacity, as well as high charging times for DC power supplies due to inverse proportionality with charging current.
Innovation Solution
The power conversion equipment incorporates a first DC power supply with an electric power feeding section and a DC electric power converting section, including a multiphase AC generator and boost circuit, along with a second DC power supply and smoothing circuit, utilizing switches and switching arms to prevent simultaneous closure and optimize power conversion between DC and AC, allowing for high-speed motor driving and charging without flux-weakening control and reducing converter capacity needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the converter capacity of the inverter is increased to drive the motor at higher speed without flux-weakening control, then the maximum revolution speed of the motor is improved, but the manufacturing costs of the electric power converter will soar
Solution Approach 1:
The patent applies dynamics by making the converter capacity adjustable rather than fixed. The inverter can dynamically change its converter capacity according to operating conditions, allowing it to operate at higher speeds without requiring a permanently oversized converter, thus avoiding increased manufacturing costs while achieving higher motor speeds when needed.
Solution Approach 2:
The patent changes the parameter of converter capacity from a static value to a variable parameter. By controlling the converter capacity to be adjustable, the system can optimize performance for different operating conditions, achieving high-speed motor operation without permanently increasing the converter's rated capacity, thereby maintaining cost-effectiveness.
2Loss of time
If the charging current is increased to shorten the charging time of the DC power supply, then the charging speed is improved, but the converter capacity of the boost converter should be large and the costs for increasing the converter capacity will soar
Solution Approach 1:
The patent applies dynamics by making the charging current adjustable rather than fixed. The boost converter can dynamically increase charging current when fast charging is needed, without requiring a permanently oversized converter. This allows short charging times to be achieved on demand without permanently increasing converter capacity and associated manufacturing costs.
Solution Approach 2:
The patent changes the parameter of charging current from a constant value to a variable parameter. By controlling the charging current to be adjustable, the system can provide fast charging when needed while maintaining a smaller, more cost-effective converter design for normal operating conditions.
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
This configuration enables high-speed motor operation and rapid DC power supply charging while maintaining lower manufacturing costs by optimizing power conversion efficiency and reducing the need for increased converter capacity, thus overcoming the limitations of conventional systems.
Implementation Method 1
a multiphase AC generator and boost circuit
Implementation Method 2
multiphase AC generator and boost circuit
Implementation Method 3
a second DC power supply including capacitor C0 connected in parallel to the electric power converter
Data Source
AI summary
Power conversion equipment includes an electric power converting section that converts DC electric power to multiphase AC electric power and feeds the converted multiphase AC electric power to a multiphase AC motor. A first short-circuit section includes a first switch disposed between a first DC power supply and the electric power converting section. A second short-circuit section includes a second switch disposed between at least one of an electric power feeding section and the electric power input section in the first DC power supply, or between a multiphase AC output point of the electric power converting section and the multiphase AC motor. A switch control section controls the first switch and the second switch such that the first and second switches are prevented from being brought into the closed-state simultaneously.