Divider-less DC-DC Converter Adaptive Filter
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Solution Overview
Problem
Conventional power converters, such as DC-DC converters, face inefficiencies and stability issues due to the use of regulation loop dividers, leading to static power loss, thermal noise sensitivity, reduced signal fidelity, and bandwidth stability problems, especially at low load conditions and high frequencies.
Innovation Solution
A power converter design that employs a feedback factor of unity and an adaptive active filter loop compensator with a bias current redistribution circuit, allowing for wide-range, high-frequency operation without gain programming, thereby avoiding the need for dividers and maintaining stable gain and bandwidth.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a feedback divider is used in the regulation loop, then the active filter amplifier input voltage range is reduced, but static power loss increases due to divider static current consumption
Solution Approach 1:
The patent removes the feedback divider from the regulation loop entirely, extracting the problematic component that caused both the input voltage range limitation and static power loss. By operating with a feedback factor of unity (no division), the system eliminates the divider's static current consumption while maintaining full input voltage range capability.
2Adaptability or versatility
If a feedback divider is used in the regulation loop, then the active filter amplifier input voltage range is reduced, but thermal noise sensitivity increases
Solution Approach 1:
By removing the feedback divider from the signal path, the patent eliminates the source of thermal noise generated by the divider resistors. The active filter amplifier now receives the full-scale feedback signal directly, improving signal-to-noise ratio and reducing thermal noise sensitivity while maintaining wide input voltage range.
3Adaptability or versatility
If a feedback divider is used in the regulation loop, then the active filter amplifier input voltage range is reduced, but the number of passive components increases
Solution Approach 1:
The patent eliminates the feedback divider network (resistors R1 and R2) from the circuit, directly reducing the passive component count. This extraction simplifies the overall circuit architecture while preserving the full input voltage range capability that would otherwise require the divider to function properly.
4Loss of energy
If loop compensators without feedback division are used, then divider-related problems are avoided, but error amplifier input signal-level correlated gain variation occurs
Solution Approach 1:
The patent implements dynamic bias current redistribution that adapts to the operating conditions. The bias current is adjusted based on the error amplifier input signal level, maintaining constant transconductance and stable gain across the wide input voltage range. This dynamic adjustment prevents gain variation while avoiding the static power loss of dividers.
Solution Approach 2:
The patent changes the bias current parameter dynamically to compensate for signal-level variations. By adjusting the bias current based on the operating point, the transconductance of the error amplifier is kept constant, ensuring stable gain without requiring a feedback divider.
5Productivity
If high switching frequencies are used, then dynamic voltage scaling performance improves, but divider static current consumption becomes significant
Solution Approach 1:
The patent removes the feedback divider that was consuming significant static current, especially problematic at high switching frequencies where fast dynamic voltage scaling is required. The extraction of this component enables efficient high-frequency operation without the penalty of divider current consumption.
Data Source
AI summary
A circuit and a method for power conversion and for generating an output voltage in accordance with a reference voltage are presented. The power converter has a circuit for filtering the output voltage, an error amplifier circuit that compares the reference voltage and the filtered output voltage for generating an error voltage as a result of the comparison. There is a circuit for driving one or more switching devices in dependence on the error voltage. The error amplifier circuit has a first differential circuit and a first bias current generation circuit for generating a first bias current for the first differential circuit, a second differential circuit and a second bias current generation circuit for generating a second bias current for the second differential circuit, and a circuit for redistributing the first bias current to the second differential circuit or redistributing the second bias current to the first differential circuit.