TLVR Nonlinear Compensation Inductor for Fast Transient Response
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Solution Overview
Problem
Conventional trans-inductor voltage regulators face challenges in achieving fast dynamic response and minimizing current ripple while maintaining accurate current reporting and efficiency, due to magnetic coupling and inductor characteristics that either slow down transient response or increase steady-state current ripple.
Innovation Solution
A trans-inductor voltage regulator with a nonlinear compensation inductor that exhibits varying inductance levels based on current, providing high inductance at low currents for accurate signal reporting and low inductance at higher currents for fast transient performance, thereby optimizing dynamic response and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a conventional linear compensation inductor is used in a trans-inductor voltage regulator, then the circuit structure is simple, but the dynamic response is slow and current ripple increases at higher current levels
Solution Approach 1:
The patent applies the dynamics principle by using a nonlinear compensation inductor whose inductance value changes dynamically with current level. At low current levels, the inductor maintains high inductance for accurate current reporting and low ripple. At high current levels, the inductance decreases automatically to enable fast transient response. This dynamic characteristic resolution directly addresses the contradiction between slow dynamic response and increased current ripple without requiring complex external control circuits.
Solution Approach 2:
The patent applies parameter changes by utilizing an inductor with current-dependent inductance parameters. The nonlinear inductor's inductance parameter naturally varies with operating conditions, providing high inductance at low currents for precision and low inductance at high currents for speed. This parameter variation resolves the technical contradiction by allowing the same component to optimize both dynamic response and current ripple performance across different operating ranges.
2Reliability
If high inductance is used in the compensation inductor, then current ripple is reduced and current reporting is accurate, but transient response becomes slow
Solution Approach 1:
The nonlinear compensation inductor implements dynamics by allowing its inductance to vary with current operating point. During steady-state low-current operation, high inductance ensures accurate current reporting and minimal ripple. During transient high-current events, the inductance automatically decreases to enable fast response. This dynamic behavior resolves the contradiction between reliability for accurate reporting and speed for transient response.
Solution Approach 2:
The patent uses parameter changes through a nonlinear inductor whose inductance parameter is a function of current magnitude. The inductance parameter transitions from high values at low currents (prioritizing accuracy) to low values at high currents (prioritizing speed). This natural parameter adaptation eliminates the need to choose between conflicting performance requirements.
3Speed
If low inductance is used in the compensation inductor, then fast transient response is achieved, but current ripple increases and current reporting accuracy deteriorates
Solution Approach 1:
The nonlinear compensation inductor applies dynamics by reversing the inductance behavior at different operating points. At high current levels during transients, low inductance enables fast response. At low current levels during steady state, high inductance restores accurate current reporting and low ripple. This dynamic adaptation resolves the contradiction between speed and reliability.
4Loss of energy
If conventional linear inductors are used in voltage converter phases, then the circuit is simple to implement, but efficiency decreases during transient conditions
Solution Approach 1:
The patent applies parameter changes by using nonlinear inductors whose inductance parameters adapt to operating conditions. During transient high-current conditions, the reduced inductance minimizes energy losses and improves efficiency. During steady-state low-current operation, the higher inductance maintains low losses through reduced ripple. This natural parameter adaptation improves efficiency across all operating conditions without adding complex control circuitry.
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
The nonlinear compensation inductor enables a fast dynamic response with reduced current ripple and improved efficiency by adjusting inductance according to current levels, addressing the limitations of conventional designs.
Implementation Method 1
Each coupled inductor may include a primary winding magnetically coupled to a secondary winding
Data Source
AI summary
A trans-inductor voltage regulator (TLVR) includes at least two voltage converter phases configured to receive a common input voltage and to provide an output voltage on an output of the voltage converter, an associated coupled inductor, and a compensation inductor. Each coupled inductor includes a primary winding magnetically coupled to a secondary winding. For each primary winding, a first terminal is coupled to the output of the associated voltage converter, and a second terminal of the primary winding is coupled to a load. A first terminal of the compensation inductor is coupled to a ground plane, and each secondary winding is coupled in series with the compensation inductor, with a last secondary being coupled to the ground plane. The compensation inductor is a nonlinear inductor exhibiting a first inductance level at a first current level, and a second inductance level different from the first inductance level at a second current level different from the first current level.