Galvanic Isolation in Power-Steering Motor Control Units
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Solution Overview
Problem
Existing power steering motor control units suffer from significant heating due to charge pump and internal regulator losses, leakage currents, and the need for protection against battery reversal, which contribute to increased fuel consumption and operational inefficiencies.
Innovation Solution
A control unit for a power steering motor that employs a voltage converter with galvanic isolation, eliminating the need for a charge pump and internal regulator, thereby reducing losses and leakage currents, and providing protection against battery reversal through galvanic isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a charge pump and internal regulator are used to power the logic circuit and control circuits, then the control unit can operate, but significant heating occurs due to voltage drop losses
Solution Approach 1:
The patent removes the charge pump and internal regulator from the control unit architecture. Instead, it uses a voltage converter with galvanic isolation that directly powers the logic circuit and control circuits, eliminating the sources of voltage drop losses and associated heating while maintaining reliable operation.
Solution Approach 2:
The patent introduces a voltage converter with galvanic isolation as an intermediary between the vehicle battery and the control circuits. This mediator provides both voltage conversion and galvanic isolation in a single component, replacing the previous two-component solution (charge pump + regulator) and eliminating the heating problem.
2Use of energy by moving object
If the control unit is directly connected to the vehicle battery, then it can be powered, but leakage current increases fuel consumption
Solution Approach 1:
The voltage converter with galvanic isolation acts as an intermediary that breaks the direct electrical connection between the vehicle battery and the control unit. This galvanic isolation eliminates leakage currents while maintaining power supply functionality, thereby reducing energy loss and fuel consumption during parking.
3Use of energy by moving object
If the control unit is directly connected to the vehicle battery, then power is supplied, but protection against battery reversal is required
Solution Approach 1:
The voltage converter with galvanic isolation serves as a protective intermediary that inherently protects the control unit from battery reversal damage. The galvanic isolation barrier prevents reverse voltage from reaching the sensitive control circuits, eliminating the need for additional protection devices and reducing system complexity.
4Adaptability or versatility
If a charge pump and internal regulator are used, then voltage conversion is achieved, but the assembly becomes complex and generates heat
Solution Approach 1:
The patent merges the voltage conversion function and galvanic isolation function into a single voltage converter component. This integration replaces the previous separate charge pump and regulator assembly, reducing component count and complexity while maintaining voltage adaptability from 3V to 36V.
Solution Approach 2:
The patent extracts and eliminates the charge pump and internal regulator from the system, replacing them with a single voltage converter that provides both voltage conversion and galvanic isolation, thereby simplifying the overall assembly while maintaining functional versatility.
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 use of a voltage converter with galvanic isolation reduces heating, eliminates leakage currents, and protects the control unit from battery-related risks, improving efficiency and reducing fuel consumption.
Implementation Method 1
a voltage converter having galvanic isolation, the voltage converter supplying the logic circuit and the control circuits
Implementation Method 2
the use of a voltage converter having galvanic isolation, for example a voltage converter of the flyback type
Data Source
Figure 1~2
Figure 3~4
AI summary
Control unit (10) for a power-steering motor of a motor vehicle, comprising: a plurality of control circuits (12a, 12b, 12c, 12d, 12e, 12f) which are intended to control the electric relays of the power-steering motor, a logic circuit (14) controlling the various control circuits, the control unit (10) further comprising a voltage converter (16) with galvanic insulation (17), the voltage converter (16) powering the logic circuit and the control circuits and being intended to be connected to an electric power supply battery (18).