Switching Element Drive Circuit with Segmented Gate Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing switching element drive circuits face challenges in improving switching characteristics and suppressing short circuit current while maintaining a small mounting area, leading to increased chip size, heating, and manufacturing costs due to the need for multiple gate drive elements, and issues with discrete semiconductor elements increasing the mounting area.
Innovation Solution
A switching element drive circuit with a voltage output unit configured as an amplifier circuit having a voltage amplification factor of 1, where the voltage switching unit provides a turn-on voltage higher than the threshold voltage but lower than the power supply voltage, and switches to the power supply voltage after a maintenance period, allowing for efficient switching and reduced short circuit current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple gate drive elements are integrated into a single IC to improve switching characteristics and suppress short circuit current, then switching performance is improved, but chip size increases leading to heating and increased manufacturing cost
Solution Approach 1:
The gate drive circuit is divided into two independent circuits: an on-side circuit with a first gate drive element for turn-on operation, and an off-side circuit with a second gate drive element for turn-off operation. This segmentation allows each element to be optimized for its specific function while reducing the overall complexity and size compared to using multiple elements in a single integrated circuit.
Solution Approach 2:
The patent extracts the gate drive elements from a single integrated circuit and implements them as separate discrete semiconductor elements. This extraction reduces the chip size requirement while still achieving the desired switching characteristics and short circuit current suppression through the coordinated operation of the on-side and off-side circuits.
2Reliability
If multiple gate drive elements are used to improve switching characteristics, then switching performance is improved, but the mounting area increases
Solution Approach 1:
The gate drive function is segmented into two independent circuits mounted on separate semiconductor elements. The on-side circuit handles turn-on operations while the off-side circuit handles turn-off operations, allowing for compact mounting arrangements while maintaining improved switching characteristics through coordinated operation.
3Weight of stationary object
If a single gate drive element is used to reduce chip size, then manufacturing cost is reduced, but the ability to suppress short circuit current and improve switching characteristics is compromised
Solution Approach 1:
The gate drive functionality is segmented into two specialized circuits: an on-side circuit optimized for turn-on operations and an off-side circuit optimized for turn-off operations including short circuit current suppression. This segmentation enables each circuit to be minimally sized for its specific function while collectively achieving comprehensive protection and improved switching characteristics.
Solution Approach 2:
The gate drive elements are extracted from a single integrated circuit and implemented as separate discrete semiconductor elements, allowing each element to be optimized for its specific function with minimal size requirements, thereby maintaining short circuit current suppression capability without requiring a large single chip.
Data Source
AI summary
A switching element drive circuit of the present invention outputs a voltage to the switching element by use of a voltage output unit configured as an amplifier circuit having a voltage amplification factor of 1 to drive the switching element. When the switching element is turned on, a turn-on voltage having a value higher than a threshold voltage of the switching element and lower than a value of a voltage of a power supply of the switching element drive circuit is provided to the voltage output unit. After elapse of a turn-on voltage maintenance period, a voltage provided to the voltage output unit is switched by a voltage switching unit to the voltage of the power supply of the switching element drive circuit.