Parallel Switch Driving Apparatus Temperature Control
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Solution Overview
Problem
Switches connected in parallel experience increased conduction loss due to rising temperature, which is exacerbated by frequent switching operations, leading to higher on-resistance and heat buildup.
Innovation Solution
A driving apparatus that includes temperature sensors to monitor switch temperatures, adjusting the number of switches turned on or off in each switching cycle based on temperature thresholds to prevent excessive heat buildup, thereby reducing conduction loss. This apparatus uses multiple drivers and power supply circuits to manage switching durations and overlap to distribute current efficiently across switches.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the switching frequency of a specified switch is increased, then the productivity is improved, but the temperature of the switch increases resulting in increased conduction loss
Solution Approach 1:
The patent divides the switching operations among multiple parallel switches (first switch, second switch, third switch, fourth switch). Instead of intensively switching a single specified switch, the control device distributes switching tasks across these parallel switches, reducing the switching frequency burden on each individual switch while maintaining overall productivity.
Solution Approach 2:
The control device dynamically adjusts the switching frequency of individual switches based on their temperature parameters. When a switch's temperature exceeds a threshold, its switching frequency is reduced or it is taken out of service, while other switches compensate by increasing their switching frequency. This adaptive parameter adjustment prevents any single switch from overheating and excessive conduction loss.
2Productivity
If the switching operations of a specified switch are intensified, then the productivity is improved, but the temperature of the switch increases resulting in increased on resistance
Solution Approach 1:
The patent segments the switching workload across multiple parallel switches. The control device monitors each switch's temperature and dynamically assigns switching tasks to maintain all switches within safe operating temperature ranges, preventing any single switch from experiencing excessive on-resistance due to overheating.
Solution Approach 2:
The control device implements feedback control by continuously monitoring temperature parameters of each switch and adjusting switching frequency assignments accordingly. This closed-loop control ensures that switches operating at higher temperatures have reduced switching frequencies, maintaining their on-resistance within acceptable limits while preserving overall system productivity.
3Productivity
If the switching operations of a specified switch are intensified, then the productivity is improved, but the temperature of the switch increases
Solution Approach 1:
The patent divides the intensive switching operations across multiple parallel switches. The control device monitors temperature parameters and dynamically distributes switching tasks to prevent any single switch from experiencing excessive temperature rise, while maintaining the required overall switching frequency for productivity.
Data Source
AI summary
In a driving apparatus for switches connected in parallel to each other, drivers respectively turn on or off the switches. A temperature obtainer obtains a value of a temperature parameter correlating with a temperature of at least one of the first and second switches. A selector selects at least one of the switches as at least one drive target switch. A driver causes at least one of the drivers to turn on the at least one drive target switch during an on duration and thereafter turn off the at least one drive target switch in each target switching cycle. The selector adjusts the number of the selected at least one drive target switch based on the value of the temperature parameter.