Semiconductor Drive Device Error Protection Circuit
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Solution Overview
Problem
Conventional drive devices for semiconductor elements cannot perform error protection operations independently of identification signals and cannot accurately identify error modes due to mixed identification signals from different phases, leading to confusion in error discrimination on the MCU side.
Innovation Solution
A drive device with an identification signal generating circuit and a protection operation signal generating circuit, where the protection operation signal has a pulse width equal to that of the error signal or identification signal with a longer pulse width, allowing independent error protection operations and distinct identification signal outputs for different error types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the pulse width of the identification signal is made equal to the length of the error signal, then the error protection operation can cope with error signals having longer pulse widths, but the MCU side cannot identify the error mode
Solution Approach 1:
The patent segments the signal processing into two independent parts: identification signal output for error mode recognition and protection operation signal output for error response. The identification signal terminal (FO) and protection operation signal terminal (FO_T) are separated, allowing each to serve its specific function without interference. This segmentation enables the MCU to identify error modes through the FO terminal while the FO_T terminal provides appropriate protection operations.
Solution Approach 2:
The patent introduces a protection operation signal as an intermediary between the error signal and the protection circuit. This intermediary signal is generated based on both the error signal and identification signal characteristics, and it mediates the activation of protection operations. The protection operation signal terminal acts as a mediator that receives signals from multiple sources and coordinates the protection response independently of the identification signal output.
2Reliability
If multiple error signals occur continuously, then comprehensive error protection is achieved, but identification signals mix with each other making error discrimination impossible
Solution Approach 1:
The patent segments the signal transmission paths by providing separate terminals: FO terminal for identification signals and FO_T terminal for protection operation signals. This segmentation prevents signal mixing even when multiple errors occur continuously. Each terminal maintains its signal integrity independently, allowing the MCU to distinguish error modes through the FO terminal while the FO_T terminal ensures comprehensive protection operations are executed.
Solution Approach 2:
The patent implements preliminary action by generating the protection operation signal based on the characteristics of the error signal and identification signal before actual protection is needed. The protection operation signal is prepared in advance with appropriate pulse widths that account for potential continuous errors, ensuring that protection operations are activated correctly without waiting for signal mixing to occur.
3Device complexity
If one FO terminal is used for both identification signal and protection operation, then device complexity is reduced, but both functions cannot be performed independently
Solution Approach 1:
The patent divides the single FO terminal into two separate terminals: FO for identification signals and FO_T for protection operation signals. This segmentation allows each terminal to be optimized for its specific function. The FO terminal outputs identification signals with pulse widths corresponding to error types for MCU recognition, while the FO_T terminal outputs protection operation signals that independently control protection circuit activation, achieving functional independence without excessive complexity.
Solution Approach 2:
While segmenting terminals, the patent maintains universality by having both terminals derive their signals from the same error signal input and internal logic circuits. The FO and FO_T terminals serve different functions but are universally connected to the same error detection and signal generation infrastructure, providing multi-functionality without requiring completely separate signal paths for each terminal.
Data Source
AI summary
A drive device to drive a semiconductor element includes: an identification signal generating circuit generating an identification signal depending on a type of an input error signal; a protection operation signal generating circuit generating a protection operation signal having a pulse width equal to that of one of the error signal and the identification signal having a longer pulse width; an identification signal terminal inputting and outputting the identification signal; a protection operation signal terminal inputting and outputting the protection operation signal; and a protection circuit performing an error protection operation depending on an own-phase protection operation signal generated by the protection operation signal generating circuit and an other-phase protection operation signal input through the protection operation signal terminal.