Adaptive Non-Overlap Time Control for Power Switches
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Solution Overview
Problem
The non-overlap time (NOT) in switched-mode power converters is typically long, leading to increased power dissipation due to current flow through body diodes of transistor-based switches, which reduces power efficiency and poses safety risks of short circuits.
Innovation Solution
A control circuitry system that uses auxiliary switches and adaptive control signals to precisely manage the non-overlap time between high side and low side switches, employing detection resistors and storage units to monitor current flow and adjust the delay between control signals to minimize power dissipation and prevent short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the non-overlap time (NOT) is increased to prevent short circuits between HS and LS switches, then safety is improved, but power dissipation increases and power efficiency decreases
Solution Approach 1:
The patent implements dynamic adaptation of the non-overlap time (NOT) parameter. The control circuitry continuously monitors the actual NOT period and adjusts the delay between control signals in real-time to optimize the balance between safety and power efficiency. This transforms the static, fixed NOT into a dynamic parameter that adapts to operating conditions, resolving the contradiction by finding the optimal NOT value that prevents short circuits while minimizing body diode conduction losses.
Solution Approach 2:
The patent employs feedback mechanisms where the control circuitry measures the actual non-overlap time and uses this information to adjust the delay between control signals. The feedback loop compares the desired NOT with the actual NOT and modifies the control signal timing accordingly. This closed-loop control enables the system to maintain safety margins while minimizing excessive NOT periods that cause power dissipation, directly addressing the technical contradiction.
2Loss of energy
If the non-overlap time (NOT) is reduced to increase power efficiency, then power dissipation decreases, but the risk of short circuits increases
Solution Approach 1:
The system dynamically adjusts the NOT parameter based on real-time monitoring of switch states and timing. Rather than using a fixed conservative NOT value that sacrifices efficiency, the control circuitry adapts the NOT to the minimum safe value required, allowing the system to operate efficiently while maintaining safety. This dynamic approach resolves the contradiction by eliminating excessive NOT margins that cause power loss.
Solution Approach 2:
The feedback mechanism continuously monitors the timing between control signals and adjusts the delay to achieve the optimal NOT. The control circuitry uses feedback to ensure that the NOT is reduced to the minimum necessary to prevent short circuits, rather than maintaining a fixed large margin. This enables the system to maximize power efficiency while preserving safety through intelligent, real-time control adjustments.
3Reliability
If the delay between control signals is increased to ensure safe operation, then short circuit prevention is improved, but the precision of NOT control deteriorates
Solution Approach 1:
The patent implements dynamic control of the delay between control signals, adjusting it in real-time based on monitored conditions. Rather than using a fixed large delay that ensures safety but reduces precision, the system adapts the delay to achieve precise NOT control. The dynamic adjustment allows the control circuitry to maintain safety margins while minimizing the delay to achieve better timing precision and reduced power dissipation.
Solution Approach 2:
The control circuitry changes the delay parameter dynamically based on operating conditions and monitored NOT periods. By adjusting the delay parameter rather than fixing it at a conservative value, the system achieves both safety and precision. The parameter change approach allows fine-tuning of the NOT to optimal values that prevent short circuits while enabling precise control for minimizing power loss.
4Loss of energy
If the delay between control signals is decreased to reduce power dissipation, then power efficiency is improved, but the precision and safety of NOT control deteriorates
Solution Approach 1:
The system uses dynamic adjustment of the control signal delay to achieve the minimum necessary NOT for safety while maximizing power efficiency. The control circuitry monitors the actual NOT and adjusts the delay dynamically, allowing the system to operate with precise timing control at optimal efficiency points rather than using fixed conservative delays that waste energy.
Solution Approach 2:
The feedback mechanism enables precise control of the NOT by continuously monitoring the timing and adjusting the delay accordingly. The feedback loop ensures that the delay is reduced to the minimum necessary to maintain safety, thereby maximizing power efficiency without sacrificing control precision. This intelligent control resolves the contradiction by using information feedback to optimize the delay parameter.
Data Source
AI summary
Circuitry for controlling a non-overlap time for a first switch and a second switch is described. Within a first state, the first switch is closed and the second switch is open, and within a second state, the first switch is open and the second switch is closed. The control circuitry has a first auxiliary switch and a second auxiliary switch. The control circuitry determines whether during a transition from the first state to the second state a current has flown through the serial arrangement of the first and second auxiliary switches. The control means adapts a non-overlap time between the first and second control signals for controlling a following transition from the first state to the second state, dependent on whether during said transition between the first and second states a current has flown through the serial arrangement of the first and second auxiliary switches.