Techniques for sensing current in multiphase trans-inductor voltage regulators
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Solution Overview
Problem
Conventional multiphase voltage regulators struggle to accurately sense current flow, leading to unreliable over-current protection and inaccurate current and voltage regulation due to the inability to measure current on the secondary side of transformers, which affects the performance of high-performance computing systems.
Innovation Solution
A trans-inductor voltage regulator that includes a first current sensing circuit to measure current through the primary winding of a transformer and a second current sensing circuit to measure current through a compensation inductor, with a filter modifying the secondary measurement to generate an accurate total current measurement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If DCR sensing circuit is used to sense current through primary winding, then current sensing is simplified, but measurement precision deteriorates due to inability to sense secondary side current
Solution Approach 1:
The patent introduces a compensation inductor as an intermediary element connected to the secondary winding. This inductor carries the secondary current and provides a measurable voltage drop that serves as a mediator to indirectly sense the secondary side current, which cannot be directly measured by the primary-side DCR sensing circuit alone.
Solution Approach 2:
The patent implements feedback by measuring the voltage across the compensation inductor and using this measurement to correct or supplement the primary winding current sensing. This feedback mechanism allows the system to account for secondary side current effects, improving overall measurement precision without significantly increasing circuit complexity.
2Speed
If high switching frequencies are used to meet transient performance requirements, then transient response is improved, but operating efficiency deteriorates
Solution Approach 1:
The patent applies preliminary action by pre-configuring the compensation inductor with specific inductance values and selecting appropriate switching frequencies before operation. This pre-optimization allows the system to achieve good transient response while minimizing switching losses, as the components are sized and configured to balance speed and efficiency requirements in advance.
3Speed
If large output capacitors are used to meet transient performance requirements, then transient response is improved, but device complexity and cost deteriorate
Solution Approach 1:
The patent extracts the transient response enhancement function from the output capacitor and relocates it to the compensation inductor and control circuitry. By taking out the transient performance requirement from the capacitor domain and implementing it through inductive compensation and active control, the system achieves fast transient response without requiring large or complex capacitor configurations.
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
Accurate sensing of phase and total current in multiphase voltage regulators, enhancing current and voltage regulation and over-current protection, thereby improving the performance of high-performance computing systems.
Implementation Method 1
the DCR sensing circuit 120 that is configured to sense the current flowing out of the switching module 105-1 and through the primary winding of the transformer 110-1
Implementation Method 2
a second current sensing circuit that generates a second measurement associated with a current flowing through a compensation inductor coupled to a secondary winding of the transformer
Implementation Method 3
a filter that is coupled to the second current sensing circuit and modifies the second measurement to generate a modified second measurement
Data Source
AI summary
Disclosed is a trans-inductor voltage regulator that includes a first current sensing circuit, a second current sensing circuit, a filter, and a voltage regulator. The first current sensing circuit generates a first measurement associated with a current flowing through a primary winding of a transformer and the second current sensing circuit generates a second measurement associated with a current flowing through a compensation inductor coupled to a secondary winding of the transformer. The filter is coupled to the second current sensing and modifies the second measurement to generate a modified second measurement. In operation, the voltage regulator controls the switching module based on the first measurement and the measurement second measurement.