Semiconductor Device High-Side Driver Surge Protection Circuit
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Solution Overview
Problem
Conventional semiconductor devices with half-bridge circuits face challenges in effectively protecting high-side drivers from surge voltages and overcurrents, leading to potential malfunction or destruction due to delayed interruption of high-side switching devices and increased counter-electromotive forces from parasitic inductances.
Innovation Solution
Incorporating a protection circuit section with a reverse blocking Zener diode and dynamic clamp circuit configurations, which absorb surge voltages and prevent destruction of high-side drivers by clamping voltages and managing surge currents, thereby protecting the high-side drivers and reducing the risk of malfunction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If high-side switching device interruption is delayed, then control flexibility is maintained, but counter-electromotive forces from parasitic inductances increase and may destroy the high-side driver
Solution Approach 1:
The patent implements protection circuits with Zener diodes and clamp circuits before the harmful counter-electromotive forces can damage the high-side driver. These circuits are pre-configured to activate when surge voltages exceed safe levels, providing beforehand cushioning that clamps the voltage and diverts current away from the high-side driver during delayed interruption events.
Solution Approach 2:
The protection circuits convert the harmful effect of delayed interruption and resulting surge voltages into a controlled event. The Zener diodes and clamp circuits deliberately break down or activate at predetermined voltage levels, transforming the potentially destructive surge into a controlled current path that protects the high-side driver while maintaining the delayed interruption benefit.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively absorbs surge voltages and prevents destruction of high-side drivers, ensuring reliable operation by quickly reacting to overvoltage conditions and reducing the risk of counter-electromotive forces, thus enhancing the semiconductor device's reliability and reducing the need for additional external countermeasures.
Implementation Method 1
a protection circuit section 60 which has a terminal a that is connected to a node extension unit 80 of high-side power supply potential, and a terminal b that is connected to a node extension unit 90 of reference potential of each phase
Implementation Method 2
Incorporating a protection circuit section with a reverse blocking Zener diode and dynamic clamp circuit configurations, which absorb surge voltages and prevent destruction of high-side drivers by clamping voltages and managing surge currents
Data Source
AI summary
Provided is a semiconductor device comprising a high-side switching device, a low-side switching device, a high-side driver configured to turn on/off the high-side switching device, a low-side driver configured to turn on/off the low-side switching device, a high-side driving external terminal configured to supply a power supply voltage for driving the high-side driver, and a protection circuit section connected to the high-side driving external terminal. The high-side driver may include a reference potential terminal set to a reference potential of the high-side driver. The protection circuit section may be connected between the high-side driving external terminal and the reference potential terminal.