High Side Drive Circuit Regeneration for Noise Immunity
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Solution Overview
Problem
Existing drive circuits for high side power devices in totem pole configurations face malfunctions due to external noise and parasitic inductance, leading to overshooting or undershooting at the totem pole midpoint, which prevents normal signal transmission and maintains the high side power device in an incorrect state.
Innovation Solution
A drive circuit with a high side drive circuit, pulse generator circuit, level shift circuit, high side potential detector circuit, and high side potential determination circuit that regenerates reset signals based on detected changes in high side potential, ensuring reliable switching of the high side power device to its correct state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a second turn-off or turn-on pulse signal is mechanically output after a predetermined time from the first pulse signal, then the high side power device can be forced to switch states, but new external noise may occur at the predetermined time point, causing malfunction to persist
Solution Approach 1:
The patent implements feedback by detecting the actual switching state of the high side power device and using this information to control the timing of regeneration pulses. The control circuit monitors whether the device has successfully switched and only regenerates the pulse when needed, creating a closed-loop system that adapts to real-time conditions rather than using fixed timing.
Solution Approach 2:
The patent makes the pulse regeneration timing dynamic by linking it to the actual switching state of the power device. Instead of using a predetermined fixed time interval, the system adjusts the regeneration timing based on real-time detection of the device's on/off state, making the system flexible and adaptive to varying operating conditions.
2Reliability
If the totem pole midpoint potential overshoots or undershoots due to external noise and parasitic inductance, then the potential reaches extreme values, but the level shift circuit cannot transmit signals normally, causing the high side power device to remain in incorrect states
Solution Approach 1:
The patent introduces an intermediary control circuit between the pulse generator and the high side power device. This control circuit detects the actual switching state and mediates the signal transmission by conditionally regenerating pulses, preventing signal transmission errors during voltage overshoot or undershoot conditions caused by noise and parasitic inductance.
Solution Approach 2:
The system uses self-service by having the control circuit automatically detect the switching state of the high side power device and autonomously decide when to regenerate pulses. The system monitors itself and takes corrective action without external intervention, ensuring reliable operation even when noise affects the totem pole midpoint potential.
Data Source
AI summary
Malfunction can be reliably avoided even when a signal that drives a high side power device is not normally transmitted in a level shift circuit. In a drive circuit, a pulse generator circuit generates a set signal and reset signal that causes a high side power device to be turned on or off. The pulse generator circuit provides set and reset signals, via a level shift circuit, to a high side drive circuit. A high side potential (a high side reference potential or a high side power supply potential) is detected by a high side potential detector circuit. A high side potential determination circuit determines a change in potential that impedes the transmission of the set signal or reset signal in the level shift circuit, and causes the pulse generator circuit to regenerate the set signal or reset signal when the timing of the detection coincides with the timing at which the set signal or reset signal is generated.