Power Converter Timing Generator Transient Response
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Solution Overview
Problem
Conventional DC-DC power converters with constant on time or adjustable on time mechanisms experience poor performance during load transient periods, leading to unstable output voltage and oscillation due to fixed frequency energy delivery.
Innovation Solution
A timing generator and method that utilizes an error signal and a delay circuit to generate an adjusting signal, which is used to adjust the timing signal for the power converter, allowing the width of the timing signal to change with the error signal and control signal, effectively stabilizing the output voltage during load transients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a constant on time mechanism is used, then the frequency is fixed, but the output voltage becomes unstable during load transients
Solution Approach 1:
The patent implements a dynamic on-time adjustment mechanism where the on-time period is no longer fixed but varies according to the error signal from the feedback loop. The timing generator receives the error signal and dynamically adjusts the pulse width modulation signal duration, allowing the system to adapt to load changes while maintaining stability.
Solution Approach 2:
The patent employs feedback control by using the error signal (derived from comparing output voltage with reference voltage) to adjust the on-time period. The feedback loop continuously monitors output voltage and modifies the timing signal accordingly, ensuring stable output voltage during load transients.
2Adaptability or versatility
If an adjustable on time mechanism is used, then the load transient response improves, but output voltage oscillation increases
Solution Approach 1:
The patent applies preliminary action by anticipating load changes through the feedback error signal and adjusting the on-time period before significant voltage deviations occur. The timing generator proactively modifies the PWM signal duration based on error signal magnitude, preventing oscillations rather than reacting to them.
Solution Approach 2:
The patent changes the timing parameter (on-time period) dynamically based on the error signal magnitude. By varying the pulse width according to feedback information, the system achieves both fast load transient response and stable output voltage without oscillation.
3Power
If the on-time is extended continuously to compensate for insufficient output voltage energy, then the output voltage increases, but the oscillation duration increases
Solution Approach 1:
The patent uses feedback control to precisely regulate on-time extension based on actual voltage needs. The error signal provides real-time information about voltage deficiency, allowing the timing generator to extend on-time only as much as necessary to correct the voltage error, preventing prolonged oscillation.
Solution Approach 2:
The patent dynamically adjusts the on-time parameter proportionally to the error signal magnitude. This ensures that power delivery is increased only to the extent needed to correct voltage deviations, minimizing oscillation duration while maintaining output voltage stability.
Data Source
AI summary
A timing generator and a timing signal generation method for a power converter are provided. The timing generator includes an adjusting circuit and a timing generation unit. The adjusting circuit receives an error signal related to an output voltage of the power converter. The adjusting circuit generates an adjusting signal according to the error signal and a delay circuit. The timing generation unit generates a timing signal according to the error signal, the adjusting signal and a control signal. A width of the timing signal is changed with the error signal and the adjusting signal. Accordingly, the timing generator adjusts On-time/Off-time in response to a transient response.