Ripple Suppressor Circuit for Power Supply Stability
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Solution Overview
Problem
Power supply controllers experience undesirable ripple voltage and beat frequencies due to variations in control signals, leading to instability in output voltage.
Innovation Solution
A ripple suppressor circuit is configured to receive digital and analog signals, determine peak and valley values, and form an average signal to stabilize the output voltage, using storage elements and edge detectors to minimize variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional power supply controllers are used to regulate output voltage, then the output voltage can be controlled to a desired value, but ripple voltage appears around the desired value due to control signal variations
Solution Approach 1:
The harmful ripple component is extracted and removed from the control signal path by detecting the edges of the PWM signal and using storage elements to capture only the stable peak and valley values, excluding the transient ripple variations from affecting the reference voltage
Solution Approach 2:
Storage elements (capacitors) are introduced as intermediary components between the PWM signal and the reference voltage generation, acting as mediators that filter out ripple while preserving the essential control information through edge-triggered sampling
2Adaptability or versatility
If control signal variations are present, then the power supply controller can respond to load changes, but timing signal beat frequencies are generated
Solution Approach 1:
The circuit uses periodic edge detection synchronized with the PWM signal frequency to sample the control signal at regular intervals, converting the continuous varying control signal into discrete periodic samples that eliminate beat frequency generation while maintaining load response capability
Solution Approach 2:
Instead of directly using the varying control signal, the circuit creates a clean copy of the essential control information by detecting edge transitions and storing peak/valley values, producing a stabilized reference signal that copies the necessary control data without the harmful timing variations
3Object-generated harmful factors
If ripple suppression is implemented using traditional filtering methods, then ripple voltage is reduced, but control loop bandwidth is limited
Solution Approach 1:
Traditional passive RC filtering mechanisms are replaced with an active digital-edge-triggered sampling system that uses logic circuits and storage elements to suppress ripple, eliminating the need for large time constants that would limit control loop bandwidth
4Stability of the object's composition
If traditional ripple filtering is applied, then output voltage stability is improved, but dynamic performance deteriorates
Solution Approach 1:
The circuit dynamically adapts to changing load conditions by continuously detecting edge transitions and updating stored peak/valley values in real-time, maintaining output voltage stability while preserving fast dynamic response capability through active rather than passive filtering
Data Source
AI summary
In one embodiment, a method of forming a ripple suppressor circuit includes a configuring the ripple suppressor circuit to receive a first signal that is representative of a requested voltage and a second signal that is a filtered value of the first signal. The method also includes configuring the ripple suppressor circuit to determine a peak value of the second signal responsively to the first signal and to determine a minimum value of the second signal responsively to the first signal. The method may also include configuring the ripple suppressor circuit to form an average value of the peak value and the minimum value.