Power Management IC Inductor Simulation for Test Efficiency
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Solution Overview
Problem
Conventional methods for testing power management integrated circuits (PMICs) require an inductor-based test device, leading to increased costs, high power consumption, and longer test times, limiting the number of concurrently testable PMICs.
Innovation Solution
A PMIC with a feedback control unit, simulation voltage formation unit, and simulation voltage output terminal that simulates inductor behavior using capacitors and current sources, allowing for testing without an inductor-based device, reducing power consumption and enabling simultaneous testing of multiple PMICs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a test device including an inductor is used to test power management integrated circuits, then the PMIC can be tested for proper control according to feedback voltage, but test costs increase and the test device becomes more complex
Solution Approach 1:
The patent creates an internal simulation model within the PMIC that copies the essential electrical characteristics of an inductor circuit. This simulation model generates simulated inductor current and voltage signals that mimic the behavior of a real inductor, allowing the feedback control unit to be tested without connecting external inductor-based test equipment. The simulation unit includes capacitors and controlled current sources that replicate inductor dynamics through mathematical modeling.
Solution Approach 2:
The patent introduces a simulation voltage formation unit as an intermediary component that bridges the gap between the PMIC's feedback control unit and the external test environment. This unit generates simulated voltage signals that represent the voltage across an inductor, allowing external testers to interact with the PMIC as if a real inductor were present, thereby simplifying external test equipment while maintaining testing validity.
2Reliability
If high current is flowed to the inductor during testing, then the PMIC control function can be properly tested, but power consumption increases
Solution Approach 1:
The patent transforms the testing approach by changing the electrical parameters from high current through a real inductor to low current through simulated signals. The simulation unit generates voltage signals that represent inductor behavior without requiring actual high current flow. The test device measures these simulated voltage signals using minimal current, thereby maintaining testing accuracy while dramatically reducing power consumption during the test process.
3Reliability
If an inductor-based test device is used, then proper PMIC control can be verified, but the number of concurrently testable PMICs is limited and test time increases
Solution Approach 1:
By implementing the simulation unit within each PMIC, the patent enables each device to generate its own test signals internally. This eliminates the need for external inductor components and complex test fixtures, allowing multiple PMICs to be tested simultaneously using simple voltage measurement equipment. The simulation model replicates inductor behavior through software/mathematical modeling, enabling parallel testing of multiple devices without requiring proportional increases in test equipment complexity.
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 enhances test efficiency, reduces costs, and shortens test time by allowing low-power testing of multiple PMICs without the need for an inductor-based test device.
Implementation Method 1
a first capacitor that simulates the inductor and generates the simulation voltage by controlling current input into or output from the first capacitor
Data Source
AI summary
An embodiment provides a power management integrated circuit including, inside thereof, a capacitor configured to simulate an inductor and multiple current sources configured to simulate an inductor voltage, wherein the power management integrated circuit is capable of testing whether an internal element normally operates without a separate test device including an inductor.