Multiphase Voltage Regulator With Non-Linear Load Line Control
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Solution Overview
Problem
Conventional power management systems with active voltage positioning (AVP) face challenges in minimizing voltage deviation during load steps, especially in systems with wide output current ranges, leading to excessive voltage deviation and power loss.
Innovation Solution
A multi-phase voltage regulator with a load line modifier circuit that implements a non-linear load line with a zero slope for low output currents and a constant non-zero slope for higher output currents, ensuring output voltage remains within a desired range by modifying the droop resistance based on sensed current levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a constant non-zero droop resistance is used in AVP, then transient response is improved, but power loss increases at low current levels
Solution Approach 1:
The patent implements a dynamic droop resistance that changes based on load current levels. At low current levels, the droop resistance is reduced or set to zero to minimize power loss. At high current levels, the droop resistance is increased to improve transient response. This dynamic adjustment resolves the contradiction by adapting the droop resistance value to operating conditions rather than using a fixed value.
Solution Approach 2:
The patent changes the droop resistance parameter based on output current levels. A load line modifier circuit dynamically adjusts the droop resistance value, setting it to a first value (lower or zero) when output current is below a threshold and to a second value (higher) when output current exceeds the threshold. This parameter change strategy resolves the contradiction between transient response and power loss.
2Speed
If output filter capacitance is increased to reduce voltage deviation, then transient response is improved, but device complexity and size increase
Solution Approach 1:
The patent changes the droop resistance parameter dynamically to achieve better transient response without increasing output filter capacitance. By adjusting the droop resistance based on load conditions, the system achieves improved voltage regulation during transients while maintaining the same or reduced filter capacitance, thus resolving the contradiction between transient response and device complexity.
3Stability of the object's composition
If droop resistance is increased to reduce voltage deviation during load steps, then output voltage stability is improved, but voltage deviation at low currents worsens
Solution Approach 1:
The patent implements dynamic adjustment of droop resistance based on operating conditions. At low current levels, the droop resistance is reduced to minimize voltage deviation. At high current levels, the droop resistance is increased to improve output voltage stability during load transients. This dynamic approach resolves the contradiction by optimizing droop resistance for different operating regions.
Solution Approach 2:
The patent applies different droop resistance values for different operating regions (low current vs. high current). The load line modifier circuit detects the operating region and applies the appropriate droop resistance value locally, ensuring optimal performance in each region rather than using a uniform value across all conditions.
Data Source
AI summary
One or more embodiments relate to a multi-phase voltage regulator with AVP or droop configured to implement a non-linear load line. According to certain aspects, the non-linear load line can have a non-linear or zero slope in a first current/voltage region and a constant non-zero slope in second current/voltage region. In embodiments, the non-linear or zero slope region can specify that for any value of output current in that region, the output voltage will be the same predetermined value. The non-zero slope region can specify that for any value of the output current in that region, output current will be multiplied by a constant non-zero droop resistance value.