Isolated Gate Driver Signal Encoding for Single-Channel Isolation
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Solution Overview
Problem
High-voltage and high-current applications require efficient signal transmission across isolation barriers in isolated gate drivers, but existing methods often use multiple channels, increasing silicon die area and costs, and complicating the design.
Innovation Solution
The use of a single transmission channel for both control and sensing signals, encoded with multiple characteristics using frequency, pulse counting, and voltage levels, facilitated by edge detectors, clock counters, signal selectors, multiplexers, and modulators, ensures efficient signal transmission while maintaining isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple transmission channels are used for control and sensing signals, then signal transmission reliability is improved, but silicon die area increases and design complexity increases
Solution Approach 1:
The patent combines control and sensing signal transmission into a single transmission channel by encoding both types of signals using the same physical infrastructure. The encoder modulates both control signals (from low-voltage side) and sensing signals (from high-voltage side) onto a common transmission medium, eliminating the need for separate dedicated channels and thereby reducing silicon die area while maintaining signal integrity through proper encoding schemes.
Solution Approach 2:
The transmission channel is designed to serve multiple functions simultaneously: it carries both control signals from the low-voltage side to the high-voltage side and sensing signals from the high-voltage side back to the low-voltage side. This multi-functional channel uses encoding techniques to distinguish between different signal types, allowing a single channel to replace what would traditionally require multiple separate channels.
2Reliability
If multiple transmission channels are used for control and sensing signals, then signal transmission reliability is improved, but device complexity increases
Solution Approach 1:
The patent merges control and sensing signal paths into a unified transmission system. By combining these functions into a single channel with integrated encoding and decoding logic, the overall device complexity is reduced compared to maintaining separate independent channels for each signal type, while still achieving reliable bidirectional communication.
Solution Approach 2:
The transmission channel is designed as a universal interface that handles both control and sensing functions. This multi-functional approach simplifies the device architecture by eliminating the need for multiple specialized channels and their associated control logic, thereby reducing design complexity while maintaining full functionality.
3Area of stationary object
If a single transmission channel is used for both control and sensing signals, then silicon die area is reduced and design is simplified, but signal transmission reliability may be compromised
Solution Approach 1:
The patent employs encoding schemes that modify signal parameters (such as frequency, amplitude, or temporal patterns) to distinguish between control and sensing signals within the single channel. By changing signal parameters rather than using separate physical channels, the system maintains reliable signal differentiation and transmission while utilizing minimal silicon die area.
Data Source
AI summary
Methods, apparatus, systems and articles of manufacture are disclosed to transmit signal in isolated gate drivers. An example apparatus includes a first encoder including: an edge detector coupled to a first sensor; a first clock counter coupled to the edge detector; a first signal selector coupled to the first clock counter; and a first multiplexer including coupled to a signal generator, the first clock counter, and the first signal selector; and a second encoder including: a level detector coupled to a second sensor; a second clock counter coupled to the level detector; a second signal selector coupled to the level detector and the second clock counter; and a second multiplexer coupled to the first multiplexer, a reference voltage, the second signal selector, and a modulator.