Adaptive TCO Compensation for SMPS Startup Voltage Control
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Solution Overview
Problem
Switched mode power supplies (SMPS) face challenges in achieving a smoothly rising voltage during startup while avoiding negative voltage slope and overshoot, which is crucial for applications like computer power supplies, as existing technologies often require tuning for specific loads and can lead to inefficient operation across a wide power range.
Innovation Solution
Incorporating an adaptive loading time controlled oscillator (TCO) compensation circuit that adjusts the TCO frequency based on the drop rate slope of the feedback voltage from the half-bridge and the load, ensuring a linear regulation of the voltage feedback signal, thereby smoothing the output voltage rise and preventing overshoot and negative slope.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a time controlled oscillator (TCO) is used during initial startup period, then the PSU can provide controlled frequency operation during startup, but voltage overshoot and negative voltage slope may occur during startup
Solution Approach 1:
The patent implements a feedback mechanism where the TCO frequency is dynamically adjusted based on the detected slope of the voltage feedback signal (VHBFB). The controller monitors the rate of change of VHBFB and modifies TCO frequency in real-time to maintain a predetermined slope, preventing both overshoot and negative slope conditions during startup transition to steady state operation
Solution Approach 2:
The patent changes the operating parameters of the TCO by dynamically adjusting its frequency based on the voltage feedback signal slope. This parameter modification allows the system to adapt the startup characteristics to prevent harmful voltage transitions while maintaining reliable controlled operation throughout the startup period
2Adaptability or versatility
If the PSU is configured to supply a wide power range, then the PSU can operate efficiently across different loads, but performance factors such as startup time and voltage stability are impacted
Solution Approach 1:
The patent introduces dynamic adjustment of the TCO frequency based on real-time detection of the voltage feedback signal slope. This dynamic control mechanism allows the PSU to adapt its startup behavior to different load conditions within the wide power range, maintaining voltage stability regardless of whether the load is light or heavy, thus resolving the conflict between adaptability and reliability
3Reliability
If the TCO frequency is adjusted to prevent voltage overshoot, then voltage stability improves, but the time to reach steady state output voltage increases
Solution Approach 1:
The patent uses feedback control where the TCO frequency is continuously adjusted based on the detected slope of VHBFB. This allows the system to optimize the balance between stability and speed by dynamically modifying the frequency to maintain the predetermined slope, preventing both overshoot and excessive startup time that would result from static frequency adjustment
Solution Approach 2:
By dynamically changing the TCO frequency parameter based on real-time slope detection, the system optimizes the startup trajectory to reach steady state efficiently while maintaining voltage stability, avoiding the time penalty that would result from conservative fixed frequency adjustment
Data Source
AI summary
A switched mode power supply (SMPS) to output a smoothly rising voltage (VOUT) during startup and still operate efficiently during steady state. A smoothly rising VOUT that avoids a negative voltage slope and voltage overshoot may be desirable in some applications. The techniques of this disclosure include an adaptive loading time controlled oscillator (TCO) compensation circuit that adjusts the TCO frequency to linearly regulate the feedback voltage from the half-bridge (VHBFB). The TCO compensation circuit adapts to the startup loading and self-adjusts the regulation speed for the handover point between the TCO and the voltage controlled oscillator (VCO).