Power Switching Circuit Dead Time Elimination
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Solution Overview
Problem
Power switching circuits experience dead time issues during transitions between power switches, leading to sudden voltage drops and potential damage to loads or low voltage power supply terminals.
Innovation Solution
A power switching circuit incorporating a driving circuit, determining circuit, first power switch, and second power switch, with a sensing circuit and dead time control circuit to manage the switching process, ensuring stable voltage transitions by controlling the switching states based on driving signal levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If power switches are switched between different voltage levels, then multiple voltage levels can be supplied, but dead time occurs causing voltage drop or shoot through
Solution Approach 1:
The determining circuit detects the rising edge of the driving signal in advance and generates a control signal to turn off the first power switch before the second power switch is fully turned on. This preliminary action eliminates the dead time gap between switch transitions, preventing voltage drops and shoot-through currents while maintaining stable power switching between different voltage levels.
2Reliability
If dead time is reduced to eliminate voltage drop, then power switching stability improves, but switch transition control becomes more difficult
Solution Approach 1:
The determining circuit continuously monitors the driving signal level and provides feedback control. When the driving signal rises from the first level to the preset level, the determining circuit automatically generates a control signal to turn off the first power switch. This feedback mechanism simplifies the control logic by using the driving signal itself as the trigger, eliminating the need for complex external timing circuits while achieving precise dead time elimination.
Data Source
AI summary
The disclosure provides a power switching circuit. The power switching circuit includes a driving circuit, a determining circuit, a first power switch, and a second power switch. The driving circuit outputs a first driving signal and a second driving signal. The determining circuit is coupled to the driving circuit and outputs a control signal to the driving circuit. The first power switch is coupled to a first input voltage and receives the first driving signal. The second power switch is coupled to a second input voltage and receives the second driving signal. When the first power switch and the second power switch are switched, the second driving signal rises from a first level to a preset level, and the determining circuit controls the driving circuit to utilize the first driving signal to turn off the first power switch.