Driver Circuit Deduces Device Parameters for Monolithic Integration
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Solution Overview
Problem
Conventional approaches to integrating driver and driven semiconductor devices into a single package or substrate result in complex chip assemblies, reliability issues, increased costs, and inefficient use of semiconductor technology due to the need for temperature and current sense structures for feedback, leading to high packaging and wafer costs.
Innovation Solution
A driver circuit that deduces device parameters from terminal parameters, eliminating the need for direct sensing of current and temperature, allowing for simpler feedback and more efficient use of semiconductor technologies, enabling monolithic integration and reduced costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If temperature and current sense structures are integrated into the base-chip for feedback, then device protection functionality is improved, but device complexity and manufacturing costs increase
Solution Approach 1:
The patent extracts the temperature and current sensing functionality from the base-chip and relocates it to the control-chip. This allows the base-chip to be manufactured using simpler, cheaper semiconductor technology without the complexity of integrated sense structures, while the control-chip handles all sensing and protection functions through its processor and memory units.
Solution Approach 2:
The control-chip is designed as a multi-functional unit that not only controls the switching device but also performs all sensing, measurement, and protection functions. The processor executes stored characteristics and algorithms to monitor device parameters, adapt driving signals, and provide protection, consolidating multiple functions into a single universal control unit.
2Device complexity
If control-chip and base-chip are integrated into a single package, then system complexity is reduced, but packaging costs and reliability issues increase
Solution Approach 1:
The patent uses electrical connection means (bond wires or conductive structures) as intermediaries to connect the control-chip and base-chip within the same package. This allows the chips to remain electrically isolated yet functionally connected, maintaining reliability while enabling integration. The connection means serve as a mediator that transfers control and feedback signals without requiring direct physical integration of the chips.
3Reliability
If conventional semiconductor technology is used for base-chip with sense structures, then device protection is enabled, but wafer costs and production costs increase
Solution Approach 1:
The patent segments the functionality into two separate chips: the control-chip manufactured with advanced semiconductor technology containing the processor, memory, and sensing circuits; and the base-chip manufactured with simpler, cheaper technology containing only the power switching device. This segmentation allows each chip to be optimized for its specific function and manufactured at appropriate cost levels.
Solution Approach 2:
The control-chip contains stored characteristics and lookup tables that represent the sensing and protection functionality. Instead of physically implementing sense structures in the base-chip, the system uses digital copies of device characteristics stored in memory, which are processed by the processor to provide protection functionality at lower manufacturing cost.
4Reliability
If multiple MOSFET devices are driven by separate control-chips, then device control is precise, but area efficiency and cost decrease due to redundancy
Solution Approach 1:
The control-chip is designed as a universal controller that can drive multiple MOSFET devices using shared control circuits and memory resources. The processor and stored characteristics can be reused for each device, eliminating the need for separate control-chips for each MOSFET. This multi-functionality maintains precise control while significantly reducing the total area and cost compared to dedicated control-chips for each device.
Data Source
AI summary
Embodiments of the invention relate to drivers and methods for driving devices, comprising at least one functional unit at least one of which is adapted to deduce a device parameter of an electronic device from a terminal parameter of the electronic device.