Power Converter On-Time Extension for Transient Response
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Solution Overview
Problem
Conventional power converters with constant on-time systems face challenges in maintaining high-frequency pulse width modulation signals due to minimum off-time, leading to longer energy delivery times, under shoots, and poor output voltage stability, especially under heavy loads, and existing solutions increase circuit complexity and costs.
Innovation Solution
A power converter with a comparator and timing generator that uses multi-step on-time calculation and multi-phase overlapping operations to generate pulse width modulation signals, allowing for automatic on-time extension and improved transient response without additional circuit complexity or cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional constant on-time system is used with minimum off-time, then circuit structure remains simple, but transient response becomes slow and output voltage stability deteriorates under heavy loads
Solution Approach 1:
The patent applies preliminary action by extending the on-time period in advance before the off-time period. The timing generator extends the on-time of the pulse width modulation signal to ensure sufficient energy is delivered to the output before the off-time begins, preventing voltage drops and improving transient response without adding complex circuitry
Solution Approach 2:
The patent implements dynamics by making the on-time period variable rather than fixed. The timing generator dynamically adjusts the on-time based on operating conditions, allowing the system to optimize energy delivery timing for different load conditions while maintaining a simple constant on-time control structure
2Stability of the object's composition
If minimum off-time is enforced in output duty cycle, then circuit operation remains stable, but energy delivery time increases causing under shoot and poor output voltage stability
Solution Approach 1:
The timing generator performs preliminary action by extending the on-time to deliver sufficient energy to the output before the mandatory off-time begins. This ensures the output voltage is adequately charged in advance, preventing under-shoot and voltage instability during the off-time period while maintaining stable circuit operation
3Speed
If pulse width modulation signal frequency is increased for faster transient response, then transient response improves, but minimum off-time prevents continuous high-level maintenance
Solution Approach 1:
The patent applies preliminary action by extending the on-time period to ensure the pulse width modulation signal maintains high-level for sufficient duration to deliver adequate energy. This allows the system to achieve faster transient response by ensuring continuous energy delivery capability without being limited by the minimum off-time constraint
Data Source
AI summary
A power converter is disclosed. The power converter includes a comparator and a timing generator. The comparator compares a first input signal with a second input signal to provide a control signal. The timing generator is coupled to the comparator. The timing generator includes a plurality of timing generating units, a logic unit, and a calculation unit. The timing generator generates a plurality of timing signals through the timing generating units and the logic unit according to the control signal, and the calculation unit forms a pulse width modulation (PWM) signal according to the timing signals. At least a part of the timing signals are overlapped.