Level-Shift Driving Circuit for Soft Shutdown Surge Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing driving circuits face issues with voltage surge during switch element shutdown, leading to potential damage and operational errors due to hard shutdowns, which existing technologies have not adequately addressed.
Innovation Solution
A driving circuit with a level shift circuit and controller that enables soft shutdown of switch elements based on signals from an abnormality detecting circuit, using a latch circuit and anti-error circuit to manage set and reset signals, and determining the shutdown type based on detected abnormalities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If hard shutdown is performed by turning off the switch element, then the switch element can be quickly disconnected, but voltage surge occurs that may damage elements in the driving circuit
Solution Approach 1:
The patent introduces a level shift circuit that converts the control signal voltage level before it reaches the switch element. This circuit acts as a cushioning mechanism that prevents direct voltage surge transmission to other circuit elements when the switch element is turned off, thereby protecting against damage while maintaining quick shutdown capability
Solution Approach 2:
The level shift circuit serves as an intermediary component between the control signal source and the switch element. It mediates the voltage transition, allowing the switch element to be turned off quickly while the level shift circuit absorbs and transforms the voltage surge, preventing it from reaching other sensitive elements in the driving circuit
2Object-affected harmful factors
If soft shutdown is implemented to reduce voltage surge, then element damage risk is reduced, but shutdown response time increases
Solution Approach 1:
The patent employs dynamic control of the switch element through a controller that adjusts the shutdown process based on real-time circuit conditions. The controller can transition the switch element from on-state to off-state in a controlled manner, optimizing the balance between reducing voltage surge and maintaining acceptable shutdown response time
3Reliability
If abnormality detecting circuit is added to determine shutdown type, then circuit reliability is improved, but device complexity increases
Solution Approach 1:
The level shift circuit is designed to perform multiple functions: it not only converts voltage levels for normal operation but also works in conjunction with the abnormality detecting circuit to determine shutdown types (hard or soft). This multi-functionality reduces the need for separate dedicated circuits for each function, thereby limiting the increase in overall device complexity while improving reliability
Data Source
AI summary
Voltage surge is prevented when the output from a driver of a driving circuit performs a hard shutdown. In this manner, the elements in the driving circuit are prevented from being damaged by the voltage surge. A driving circuit includes a level shift circuit configured to convert an input signal from a preceding-stage circuit into an output signal having a higher voltage than the input signal, and a controller configured to determine whether a switch element is to perform a soft shutdown based on a state signal indicating a state of the preceding-stage circuit. Here, the driving circuit is configured to drive the switch element.