Fault Protected Output Driver IC for Independent Switch Isolation
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Solution Overview
Problem
Conventional half-bridge circuit driver ICs fail to identify and isolate individual switching elements with faults, leading to significant time and power losses as all drivers must be stopped upon detection of a failure.
Innovation Solution
A fault and short-circuit protected output driver IC is designed with logic control and level shifter, high and low side driver and protection circuits that detect discrepancies and short circuits, allowing individual drivers to be shut down independently, while other drivers continue operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional driver IC stops all drivers upon detecting a failure, then system safety is ensured, but productivity and time efficiency deteriorate due to complete system shutdown
Solution Approach 1:
The driver IC is divided into multiple independent driver modules (first driver, second driver, etc.), each capable of independent operation. When a failure is detected in one driver, only that specific driver is shut down while other drivers continue to operate, achieving localized fault isolation rather than complete system shutdown.
2Reliability
If conventional driver IC shuts down all drivers to protect against failures, then component damage is prevented, but energy consumption increases due to repeated full-system restarts
Solution Approach 1:
The protection mechanism is segmented to affect only the faulty driver module. The first driver can be shut down independently when its associated switching element fails, while the second driver remains operational, thereby preventing unnecessary energy loss from complete system shutdown and restart cycles.
3Device complexity
If conventional driver IC cannot identify specific faulty switching elements, then diagnostic capability is limited, but device complexity increases with additional detection circuits
Solution Approach 1:
The detection system is segmented with each driver module having its own failure detection capability. The control circuit can identify which specific driver (first or second) has failed by monitoring individual driver status, providing precise fault identification without requiring complex centralized detection circuits.
Data Source
AI summary
A driver and protection circuit for driving a power switch is disclosed. The driver and protection circuit includes a fault detection block configured to detect a discrepancy between a reference drive signal and a measured voltage at a gate of the power switch. The driver and protection circuit also includes a short circuit detection block configured to detect a gate-to-source short circuit or a gate-to-drain short circuit of the power switch. The driver and protection circuit further includes a latch coupled to the fault detection block and the short circuit detection block to selectively turn off an output driver coupled to the gate of the power switch when a fault or a short circuit is detected, and wherein the latch is configured to send a diagnostic signal when the fault or the short circuit is detected.