Adaptive Gain and Bandwidth Ramp Generator Circuit
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Solution Overview
Problem
Conventional power converter implementations using feedback resistor networks suffer from reduced broadband gain and bandwidth, which limits transient performance and hinders their use in markets requiring larger input and output voltage ranges, and conventional mitigations like feedforward capacitors increase costs and size without real-time adaptability.
Innovation Solution
A circuit that modifies the effective slope of the ramp signal used in power converter control based on real-time feedback, using a filter to extract direct-current information from the power converter output and a current generator to provide a ramp current, thereby mitigating the gain and bandwidth losses associated with feedback resistor networks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a feedback resistor network is used to provide feedback voltage, then feedback is achieved for power converter operation, but broadband gain and bandwidth are reduced
Solution Approach 1:
The patent introduces an intermediary circuit comprising a filter, current generator, and capacitor that generates a ramp signal to compensate for the bandwidth-limiting effect of the feedback resistor network. This intermediary system mediates between the feedback requirement and the bandwidth preservation need by adding a compensating ramp signal that restores the high-frequency response without eliminating the feedback function.
2Speed
If feedforward capacitors are used to mitigate gain and bandwidth loss, then some performance recovery is achieved, but device size and cost increase
Solution Approach 1:
The patent employs dynamic elements including a filter that extracts real-time output voltage information, a current generator that dynamically adjusts ramp current based on filtered feedback, and a capacitor that generates a time-varying ramp signal. This dynamic approach allows the circuit to adaptively compensate for bandwidth loss without requiring large static capacitors, achieving performance recovery with smaller component sizes.
3Reliability
If conventional feedback resistor networks are used, then feedback is provided, but transient performance is limited
Solution Approach 1:
The patent implements a feedback mechanism where the filter continuously monitors the power converter output, extracts relevant information, and feeds this back to the current generator. The current generator uses this feedback to dynamically adjust the ramp signal, creating a closed-loop system that maintains optimal transient performance while preserving the fundamental feedback function of the resistor network.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces the reduction in gain and bandwidth compared to conventional methods, improving power converter performance without the cost and size issues of larger capacitors, and allows for real-time adaptation to changing output voltages.
Implementation Method 1
The filter is configured to receive a signal representative of an output of a power converter and extract direct-current information from the signal representative of the output of the power converter to provide a filtered signal
Implementation Method 2
The capacitor is configured to provide a ramp voltage based on charging and discharging according to the ramp current
Data Source
AI summary
In some examples, a circuit includes a resistor network, a filter, a current generator, and a capacitor. The resistor network has a resistor network output and is adapted to be coupled between a switch terminal of a power converter (104) and a ground terminal. The filter has a filter input and a filter output, the filter input coupled to the resistor network output. The current generator has a current generator output and first and second current generator inputs, the first current generator input configured to receive an input voltage and the second current generator input coupled to the filter output. The capacitor is coupled between the current generator output and the ground terminal.