Motor Controller Reverse-Bias Protection Mechanism
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Solution Overview
Problem
Existing motor controller reverse-bias preventing mechanisms are inefficient due to high current requirements, leading to increased costs and reduced power conversion efficiency, especially in high-current environments.
Innovation Solution
A motor controller with a reverse-bias preventing mechanism that includes a pre-charging unit, protection unit, conversion unit, and control unit, where the protection unit determines the polarity of the power signal to decide whether to output it, reducing the current through the second electric conduction path and minimizing the volume and cost of the protection unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a Schottky diode or field effect transistor is used as the reverse-bias preventing unit in the main loop, then the reverse-bias protection function is achieved, but the volume and cost of the protection unit increase due to high current requirements
Solution Approach 1:
The patent divides the power signal processing into two separate paths: a first electric conduction path for pre-charging and a second electric conduction path for protection. By segmenting the current flow, the protection unit in the second path only needs to handle small control currents rather than the full power current, significantly reducing its volume while maintaining protection functionality.
Solution Approach 2:
The patent introduces an intermediary control mechanism where the protection unit outputs a control signal based on power signal polarity detection. This control signal then regulates the pre-charging unit in the first path. The intermediary approach allows the protection unit to control high-power flow without directly carrying it, reducing its size requirements.
2Reliability
If a Schottky diode or field effect transistor with larger volume is used for reverse-bias prevention, then the protection function is achieved, but the power consumption increases and power conversion efficiency decreases
Solution Approach 1:
By segmenting the power processing into separate pre-charging and protection paths, the protection unit only consumes power for polarity detection and control signal generation, rather than dissipating power while carrying full load current. This significantly reduces energy loss.
Solution Approach 2:
The control signal acts as an intermediary that enables the protection unit to regulate power flow without directly handling high currents. This intermediary mechanism minimizes resistive losses and improves overall power conversion efficiency while maintaining protection capability.
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 design reduces the volume and cost of the protection unit while optimizing power conversion efficiency by minimizing current through the second electric conduction path, effectively preventing reverse-bias damage without compromising performance.
Implementation Method 1
The protection unit is adapted for receiving the power signal through a second electric conduction path, and for determining whether to output the power signal according to the polarity of the power signal
Data Source
AI summary
A motor controller with a reverse-bias preventing mechanism includes a pre-charging unit, a protection unit, a conversion unit and a control unit. The pre-charging unit receives a power signal through a first electric-conduction path, and converts the power signal into a pre-charging signal according to a control signal. The protection unit receives the power signal through a second electric-conduction path, and determines whether to output the power signal, according to the polarity of the power signal. The conversion unit, coupled to the protection unit, receives the power signal outputted by the protection unit, and converts the power signal into a work voltage. The control unit, coupled to the conversion unit and the pre-charging unit, receives the work voltage to generate the control signal. The current of the power signal flowing through second electric-conduction path is smaller than the current flowing through first electric-conduction path.