Integrated Freewheeling Transistor Circuit for Load Drive
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Solution Overview
Problem
Existing circuit arrangements for driving loads with transistor components require an additional external diode as a freewheeling element, increasing production costs and complexity.
Innovation Solution
Integration of a freewheeling element, realized as a transistor of a second conduction type, within a common semiconductor body with the transistor component, eliminating the need for an external diode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an external diode is connected in parallel with the load to act as a freewheeling element, then the voltage loading on the transistor component is reduced, but the production costs and circuit complexity increase
Solution Approach 1:
The patent merges the freewheeling diode function with the transistor component by integrating a second transistor (T2) configured as a diode within the same semiconductor body. This integration eliminates the need for external discrete diode components while maintaining the voltage protection function during load commutation.
Solution Approach 2:
The semiconductor device achieves multi-functionality by incorporating the freewheeling capability directly into the transistor structure. The second transistor T2, connected with its gate and source shorted, serves as an integrated freewheeling element that operates automatically during load commutation without requiring external components.
2Reliability
If an external diode is connected in parallel with the load to act as a freewheeling element, then the voltage loading on the transistor component is reduced, but the production costs increase
Solution Approach 1:
The patent merges the freewheeling diode function with the transistor component by integrating a second transistor (T2) configured as a diode within the same semiconductor body. This integration eliminates the need for external discrete diode components while maintaining the voltage protection function during load commutation.
3Productivity
If a transistor component is used to drive an inductive load, then the load can be switched on and off, but voltage spikes occur when the transistor is turned off
Solution Approach 1:
The patent implements beforehand cushioning by providing a freewheeling path through transistor T2 configured as a diode. This path is prepared in advance and automatically activates during load commutation to cushion the voltage spike that occurs when the main transistor T1 is turned off, protecting the semiconductor device from voltage damage.
Data Source
AI summary
A circuit arrangement configured to drive a load is disclosed herein. The circuit arrangement comprises a first and a second supply potential terminal for application of a first supply potential and a second supply potential. A load terminal is provided between the first and second supply potential for connection of the load. The circuit arrangement further comprises a first transistor component of a first conduction type. The first transistor component includes a load path and a control terminal, with the load path connected between the first supply potential terminal and the load terminal. The circuit arrangement also comprises a freewheeling element. The freewheeling element is provided as a second transistor of a second conduction type connected up as a diode. The second transistor is connected between the load terminal and the second supply potential terminal. The first transistor component and the freewheeling element are integrated in a common semiconductor body.