Wireless Isolation Interface for HV Motor Drive ICs
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Solution Overview
Problem
Conventional isolation methods between low voltage (LV) and high voltage (HV) circuits in automotive systems are costly, space-consuming, and unreliable, particularly in harsh environments, as they require multiple opto-couplers, capacitive couplers, or transformers to achieve sufficient isolation, which are prone to degradation and increase complexity.
Innovation Solution
A wireless transmission interface using antenna structures on separate LV and HV driver ICs, where the LV signal transmitter and HV driver ICs are physically isolated and communicate wirelessly, eliminating the need for on-silicon isolation and reducing component count, with adjustable isolation values and robust mechanical separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional isolation methods (opto-couplers, capacitive couplers, transformers) are used between LV and HV circuits, then electrical isolation is achieved, but device complexity and component count increase
Solution Approach 1:
The patent combines the isolation function and signal transmission function into a single wireless communication interface. The LV circuit and HV circuit each have integrated antennas that communicate wirelessly, merging multiple isolation components into one unified wireless transmission system, thereby reducing component count while maintaining isolation reliability
Solution Approach 2:
The patent introduces wireless electromagnetic waves as an intermediary medium to transfer signals between LV and HV circuits. Instead of direct electrical connection through multiple isolation components, the signal is transmitted through air space via wireless communication, eliminating the need for physical isolation components while maintaining electrical isolation
2Reliability
If conventional isolation methods are used, then electrical isolation is provided, but space requirements increase
Solution Approach 1:
The patent integrates the antenna structures directly into the LV and HV driver ICs, combining the isolation function with the existing circuit layout. This eliminates the need for separate isolation components and reduces the overall space required for isolation implementation
Solution Approach 2:
By using wireless electromagnetic waves as the intermediary for signal transmission, the patent eliminates the need for physical isolation components that would occupy space. The air space between LV and HV circuits serves as the transmission medium, requiring minimal additional space while maintaining effective isolation
3Loss of information
If conventional isolation methods are used, then signal transmission is achieved, but cost increases
Solution Approach 1:
The patent combines multiple isolation components into a single wireless communication interface implemented in standard CMOS technology. This integration reduces the bill of materials and assembly costs associated with multiple discrete isolation components while maintaining signal transmission integrity
Solution Approach 2:
The patent uses standard CMOS process to implement the wireless communication interface, replacing expensive specialized isolation components with readily available semiconductor fabrication processes. This approach significantly reduces manufacturing cost while achieving the required isolation and signal transmission functions
4Reliability
If conventional isolation methods are used, then isolation is provided, but reliability in harsh environments decreases due to degradation
Solution Approach 1:
By using wireless electromagnetic waves as the intermediary for signal transmission, the patent eliminates physical isolation components that are susceptible to degradation from environmental factors such as temperature, humidity, and vibration. The wireless interface has no moving parts or degradable materials, providing stable isolation performance throughout the component lifespan
Solution Approach 2:
The patent replaces the mechanical/physical isolation system (opto-couplers, capacitive couplers, transformers) with an electromagnetic field-based wireless communication system. This substitution eliminates the mechanical degradation issues associated with physical components while maintaining effective electrical isolation in harsh automotive environments
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 solution provides reliable, cost-effective, and compact high voltage isolation with reduced component count, increased reliability, and flexibility in isolation values, while minimizing electromagnetic interference and environmental noise impact, enabling efficient communication between LV and HV circuits.
Implementation Method 1
a wireless transmission interface using antenna structures on separate LV and HV driver ICs, where the LV signal transmitter and HV driver ICs are physically isolated and communicate wirelessly
Data Source
AI summary
An automotive drive system for a high voltage electric motor comprises a microcontroller and ECU powered by a low voltage (12 volt) bus net which controls the drives of a high voltage inverter powered by a 100 volt or higher source, which, in turn, drives the motor. To provide good electrical insulation between the low voltage and high voltage systems, the low voltage control signals are produced by a low voltage signal transmitter chip which has a small integral antenna which wirelessly communicates with the antenna of a high voltage driver IC which drives the power devices of the high voltage inverter. The two IC chips are separated by a suitable isolation distance and may be bare chips, individually packaged chips or co-packed chips. Plural control IC chips and driver IC chips can communicate with one another for adverse control functions, including “smart” functions.