Power Switch Driver Circuit for In-Line Characterization
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Solution Overview
Problem
Existing power switch characterization methods are limited to offline testing, which does not accurately reflect in-field operating conditions, and lack efficient integration of characterization with control functions.
Innovation Solution
A driver circuit with a multi-functional pin and a state machine that enables in-line characterization of power switches, combining soft turn-off, clamping, and characterization modes using a shared current source, allowing measurements during the power switch's operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If offline testing methods are used for power switch characterization, then device complexity is reduced, but measurement precision and reliability of in-field characterization deteriorate
Solution Approach 1:
The patent applies multi-functionality by enabling the multi-function pin to serve dual purposes: controlling power switch turn-off and performing in-line characterization measurements. The state machine orchestrates these different functions, allowing the same hardware resources to be used for both control and measurement, thereby improving measurement precision without proportionally increasing device complexity.
2Measurement precision
If additional current sources are added for characterization measurements, then measurement precision improves, but device complexity and cost increase
Solution Approach 1:
The patent reuses the existing current source that is already part of the driver circuit for soft turn-off functionality. This same current source is leveraged to perform in-line characterization measurements during the power switch turn-off process. By making the current source multi-functional, the patent achieves accurate characterization without adding extra current sources, thereby avoiding increased device complexity and cost.
Solution Approach 2:
The driver circuit performs self-characterization by using its own internal current source and control mechanisms to measure power switch parameters. The state machine coordinates the reuse of existing circuit elements for dual purposes, allowing the system to characterize itself without requiring external or additional dedicated measurement hardware.
3Reliability
If in-line characterization is implemented during power switch operation, then reliability and predictive maintenance improve, but device complexity increases
Solution Approach 1:
The patent implements in-line characterization by making the driver circuit's multi-function pin and state machine serve dual roles: controlling power switch operation and performing real-time measurements during turn-off events. This approach enables reliability monitoring and predictive maintenance capabilities while leveraging existing control infrastructure, thereby minimizing the increase in device complexity.
Data Source
AI summary
This disclosure is directed to a driver circuit configured to control a power switch. The driver circuit may comprise an output pin, wherein the driver circuit is configured to deliver drive signals from the output pin to the power switch to control turn ON of the power switch; a multi-function pin; and a state machine configured to define operation of the driver circuit using the multi-function pin, wherein the state machine is configured to select among a soft turn OFF mode, a clamping mode, and an in-line characterization mode.