Floating Switch Drive Circuit With Gate-Source Voltage Clamping
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Solution Overview
Problem
Floating switches in high-voltage applications, such as multiplexers and amplifiers, face accuracy issues due to current flow from the drive circuit to the switch nodes, affecting voltage regulation and overall circuit accuracy.
Innovation Solution
A drive circuit configuration with transistors and a clamp circuit that maintains gate-source voltages to prevent current flow from the drive circuit to the switch nodes, ensuring accurate switching states without influencing the voltage at the switch nodes, using a control circuit and clamp circuit to manage the on and off states of transistors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a drive circuit is used to control the floating switch, then the switching function is achieved, but current flows from the drive circuit to the switch nodes affecting voltage regulation and accuracy
Solution Approach 1:
The patent introduces an isolation circuit as an intermediary between the drive circuit and the floating switch nodes. This isolation circuit blocks the harmful current flow from the drive circuit to the switch nodes while still allowing the drive signal to control the switch properly. The intermediary structure resolves the contradiction by separating the control function from the voltage node, preventing accuracy degradation.
Solution Approach 2:
The patent divides the drive circuit into separate functional stages: a control stage that generates switching signals and an isolation stage that prevents current leakage to the voltage nodes. By segmenting the drive circuit architecture, the control function is maintained while the harmful current path is eliminated, resolving the accuracy issue.
2Extent of automation
If the drive circuit directly controls the switch nodes, then switching control is achieved, but the voltage accuracy at switch nodes is degraded due to current injection
Solution Approach 1:
An isolation circuit is introduced as a mediator between the automated drive circuit and the voltage-critical switch nodes. This intermediary component allows the drive circuit to maintain full automation and control capability while preventing current injection that would degrade voltage accuracy. The mediator translates the control signal without allowing harmful current flow.
Solution Approach 2:
The control system is segmented into a high-level control circuit that generates switching commands and a low-level isolation circuit that executes switching while blocking current leakage. This segmentation allows automated control to be maintained at the command level while the execution level preserves voltage accuracy through the isolation structure.
Data Source
AI summary
An apparatus can include: a drive circuit for a floating switch having first and second transistors coupled in series, where gate terminals of the first and second transistors are coupled together, and source terminals of the first and second transistors are coupled together; a control circuit coupled to the gate terminals of the first and second transistors, and being configured to control on and off states of the first and second transistors; and a clamp circuit configured to clamp gate-source voltages of the first and second transistors to maintain current switching states of the first and second transistors.