Sensor Circuit for Multiphase Power Supply Phase Current
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional sensor circuits in multiphase power supplies struggle to accurately represent phase currents due to magnetic couplings between phase paths, leading to suboptimal regulation of output voltage.
Innovation Solution
The implementation of sensor circuits that are magnetically coupled to multiple phase paths, allowing them to account for induced currents and generate more accurate sense signals, which are then fed back to the power-supply controller to regulate the output voltage effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional sensor circuits are used in multiphase power supplies, then the device complexity is reduced, but the measurement precision of phase currents deteriorates due to magnetic couplings between phase paths
Solution Approach 1:
The patent introduces an intermediary processing stage in the sensor circuit that accounts for magnetic coupling effects. The sensor circuit includes additional components that measure and compensate for the induced currents from magnetically coupled phase paths, acting as a mediator between the actual phase current and the measured value to eliminate measurement errors.
Solution Approach 2:
The sensor circuit incorporates feedback mechanisms where the measured phase currents and their induced components are fed back through additional circuitry that subtracts or compensates for the coupling effects. This feedback loop allows the system to continuously correct measurement errors caused by magnetic coupling between phases.
2Measurement precision
If sensor circuits account for magnetic couplings between phase paths, then the measurement precision of phase currents is improved, but the device complexity of sensor circuits increases
Solution Approach 1:
The sensor circuit is segmented into distinct functional blocks: one block measures the primary phase current, while separate blocks measure the induced currents from each magnetically coupled phase path. This segmentation allows each block to be optimized independently and simplifies the overall design by breaking down the complex measurement task into manageable components.
Solution Approach 2:
The sensor circuit design uses universal measurement techniques that can be applied to each phase path independently. The same circuit topology and compensation method are reused across multiple phases, allowing the system to handle magnetic couplings in a systematic way without requiring unique complex circuitry for each phase.
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 enables more precise representation of phase currents, enhancing the accuracy of output voltage regulation and improving the overall performance of multiphase power supplies.
Implementation Method 1
where the phase paths are magnetically coupled to one another (e.g., the phase paths include magnetically coupled windings), the sensor circuits are able to account for the portions of the phase currents induced by the magnetic couplings between phase paths
Data Source
AI summary
An embodiment of a power supply includes a supply output node, phase paths, and sensor circuits. The supply output node is operable to carry a regulated output voltage, and each phase path has a respective phase-path non-output node, has a respective phase-path output node coupled to the supply output node, and is operable to carry a respective phase current. And each sensor circuit has a respective sensor node coupled to the phase-path non-output nodes and is operable to generate a respective sense signal that represents the phase current flowing through a respective one of the phase paths. For example, where the phase paths are magnetically coupled to one another, the sensor circuits take into account the portions of the phase currents induced by the magnetic couplings to generate sense signals that more accurately represent the phase currents as compared to conventional sensor circuits.