Pulse Counting Registers for Power Switch Signal Mismatch Detection
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Solution Overview
Problem
Existing power switch control systems face challenges in identifying and addressing potential issues with control signals, leading to circuit failures due to undetected errors or signaling problems, which can be caused by various factors including circuit noise, poor design, or environmental exposure.
Innovation Solution
The implementation of registers within driver circuits to count rising and falling edges of pulse modulation signals, allowing for the identification of counter mismatch between control and drive signals, which indicates potential problems, enabling proactive measures such as disabling operation or sending alerts to prevent future failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pulse modulation control signals are used to control power switches, then power delivery control is achieved, but potential signaling problems and circuit failures occur undetected
Solution Approach 1:
The patent implements feedback by counting pulses in the control signal and comparing the count to expected values. The register stores the counted pulses and enables comparison to detect mismatches between control signals and actual power switch operation, providing a feedback mechanism to identify signaling problems.
Solution Approach 2:
The patent introduces an intermediary counting mechanism between the control signal source and the power switch. The pulse counter and register act as intermediaries to monitor and verify the control signals, detecting errors without directly interfering with the primary control function.
2Reliability
If galvanic isolation barrier is used to isolate low-voltage and high-voltage domains, then safety is improved, but signal transmission and monitoring become more difficult
Solution Approach 1:
The patent uses the galvanic isolation barrier as an intermediary that safely separates voltage domains while allowing controlled signal transmission. The isolation barrier enables safe signal transfer from low-voltage control domain to high-voltage power domain without direct electrical connection, maintaining safety while enabling monitoring.
Solution Approach 2:
The patent replaces direct electrical connection with optical or magnetic coupling through the galvanic isolation barrier. This substitution allows signal transmission across the isolation barrier without galvanic connection, enabling monitoring while maintaining safety through non-contact signal transfer.
3Measurement precision
If pulse counting registers are added to monitor control signals, then detection capability is improved, but device complexity increases
Solution Approach 1:
The patent implements multi-functionality by integrating pulse counting and error detection capabilities into the existing driver circuit. The register serves multiple purposes: storing control signal counts, enabling comparison with expected values, and providing error detection, thereby achieving enhanced monitoring without proportionally increasing complexity.
Solution Approach 2:
The patent merges the pulse counting function with the existing driver circuit architecture. The counter and register are integrated into the driver circuit, combining monitoring functions with the control signal generation and power switch driving functions, reducing overall system complexity compared to separate monitoring systems.
Data Source
AI summary
This disclosure describes circuits and techniques for identifying potential problems with control signals for power switches. More specifically, this disclosure describes the use of registers, e.g., volatile or non-volatile storage elements, configured to count the rising and/or falling edges of pulse modulation (PM) signals within driver circuits or other control circuits. By counting the edges of PM signals within driver circuits, signaling problems can be identified based on mismatch between different counters. The techniques may be used by a driver circuit to detect circuit problems, or readout of the registers can be done after device failure, in order to help identify whether signaling problems may have caused the device failure.