Shared RC Network for Redundant Amplifier Safety Circuit
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Solution Overview
Problem
Existing pyrotechnical safety switch systems for high voltage electrical currents in vehicles lack efficient redundancy and area optimization, leading to potential short circuits and increased layout area due to separate resistor-capacitor networks for primary and secondary amplifiers.
Innovation Solution
A circuit architecture that shares a single resistor-capacitor network between primary and secondary amplifiers, with switches coupling the active amplifier to the RC network, providing redundancy and reducing layout area by up to 20%.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate resistor-capacitor networks are used for primary and secondary amplifiers, then reliability through redundancy is improved, but layout area increases
Solution Approach 1:
The patent merges the resistor-capacitor networks of the primary and secondary amplifiers into a single shared network. The RC network is designed to compensate for both amplifiers simultaneously, eliminating the need for separate compensation networks while maintaining the redundancy required for safety operation. This merging reduces the overall layout area by up to 20% while preserving reliability.
Solution Approach 2:
The shared resistor-capacitor network is designed to serve multiple functions: it compensates for both the primary amplifier and the secondary amplifier, making it a universal compensation network. This multi-functionality allows a single RC network to provide the stability and frequency response compensation that would traditionally require separate networks for each amplifier channel.
2Reliability
If redundant current limit architecture is implemented, then safety and reliability are improved, but device complexity increases
Solution Approach 1:
The patent combines the compensation networks of the redundant primary and secondary amplifiers into a single shared RC network. This merging reduces the total number of components and interconnections required, thereby lowering device complexity while maintaining the redundant architecture necessary for safety-critical operation.
3Stability of the object's composition
If separate RC networks are used for each amplifier, then amplifier stability is improved, but area consumption increases
Solution Approach 1:
The patent merges separate RC compensation networks into a single shared network that stabilizes both the primary and secondary amplifiers. The RC network is configured with resistors and capacitors connected to compensation inputs of both amplifiers, providing the necessary frequency response compensation and stability for both channels simultaneously.
Solution Approach 2:
The shared RC network performs universal compensation for both amplifiers, providing stability and frequency response control to both the primary and secondary amplifier channels. This multi-functional design ensures that both amplifiers maintain stable operation while sharing common compensation components, thereby reducing area consumption.
Data Source
AI summary
In an example, a circuit includes a transistor and a first amplifier having an output coupled to a control terminal of the transistor. The circuit includes a second amplifier having a second amplifier output coupled to the control terminal of the transistor. The circuit includes a resistor-capacitor network. The circuit also includes a first switch coupled to the first amplifier output, the transistor, and the resistor-capacitor network. The circuit includes a second switch coupled to the second amplifier output, the transistor, and the resistor-capacitor network, where the first switch is configured to couple the first amplifier output to the resistor-capacitor network, and the second switch is configured to couple the second amplifier output to the resistor-capacitor network.