Online Inductance Monitoring Based on Dynamic Characteristics and ESR Effect Compensation for Buck Converter Without
Chen Chen1, Liang Wang2, Wanyang Wang3
1School of Electronic Information, Wuhan University of Science and Technology, Wuhan 430081, China.
Sensors (Basel, Switzerland)
|June 27, 2025
Summary
This study introduces a cost-effective online inductance monitoring method for digital current mode-controlled buck converters. It accurately estimates inductance without current sensors, even with high capacitor ESR, improving control performance.
Area of Science:
- Electrical Engineering
- Power Electronics
- Control Systems
Background:
- Accurate modeling of buck converters is crucial for digital current mode (CM) control performance.
- Traditional inductance monitoring methods using current sensors increase system cost and complexity.
Purpose of the Study:
- To propose a novel online inductance monitoring method for buck converters that eliminates the need for current sensors.
- To enhance the robustness of inductance monitoring against output capacitor equivalent series resistance (ESR).
Main Methods:
- Derived an inductance calculation model based on buck converter dynamic characteristics, including inductor volt-second and capacitor charge balance principles.
- Incorporated inductor current switching ripple characteristics to ensure model accuracy.
- Investigated and addressed the impact of capacitor ESR on inductance monitoring accuracy through an ESR estimation method.
Main Results:
- Developed a sensorless online inductance monitoring technique for digital CM-controlled buck converters.
- Achieved reliable inductance monitoring accuracy, even in the presence of significant output capacitor ESR.
- Validated the proposed method through simulations and experimental results on a digital sensorless current mode (SCM) controlled buck converter.
Conclusions:
- The proposed method offers a cost-effective solution for accurate online inductance monitoring in buck converters.
- The technique improves the tolerance to capacitor ESR, making it suitable for a wider range of applications.
- Sensorless current mode control with accurate inductance estimation enhances overall converter performance and reliability.
More Related Videos
05:11High-precision Electromagnetic Flowmeter with Empty Pipe Detection via Complex Programmable Logic Device-based Waveform Recognition
Published on: June 27, 2025
223
11:44Real-Time DC-dynamic Biasing Method for Switching Time Improvement in Severely Underdamped Fringing-field Electrostatic MEMS Actuators
Published on: August 15, 2014
10.4K
Related Concept Videos
01:29Calculation of Self-inductance
463
The self-inductance of a circuit, often simply called the inductance, is a purely geometric factor that depends only on the circuit component's structure. More specifically, it depends on the shape and size of the component that lets the flux pass through it, thus inducing an electric field that opposes any current passing through it.
Since the effect of the induced electric field and the back EMF generated depends on the rate of change of current and the self-inductance, the inductance...
Since the effect of the induced electric field and the back EMF generated depends on the rate of change of current and the self-inductance, the inductance...
463
01:11Inductors
512
An inductor is a passive component built to store energy within its magnetic field. It can be fabricated by coiling a wire around a magnetic core. When current is permitted to flow through this inductor, it is observed that the voltage across the inductor is directly proportional to the time rate of change of the current. Mathematically,
512
01:16Energy Stored in Inductors
564
An inductor is ingeniously crafted to accumulate energy within its magnetic field. This field is a direct result of the current that meanders through its coiled structure. When this current maintains a steady state, there is no detectable voltage across the inductor, prompting it to mimic the behavior of a short circuit when faced with direct current.
In terms of gauging the energy stored within an inductor, it is equivalent to the integral of the power delivered at every individual moment, all...
In terms of gauging the energy stored within an inductor, it is equivalent to the integral of the power delivered at every individual moment, all...
564
01:24Self-Inductance
2.5K
Mutual inductance arises when a current in one circuit produces a changing magnetic field that induces an emf in another circuit. On the other hand, self-inductance arises when the current passing through the circuit changes, creating a changing magnetic flux, resulting in inductance in the same circuit.
Consider a circuit connected to an AC source. As the current varies with time, the magnetic flux through the circuit correspondingly changes. Faraday's law tells us that an emf would...
Consider a circuit connected to an AC source. As the current varies with time, the magnetic flux through the circuit correspondingly changes. Faraday's law tells us that an emf would...
2.5K
01:22Series R—L Circuit Transients
156
In a series resistor-inductor (R-L) circuit, closing the switch at the start of the time period simulates a three-phase short circuit, a fault condition where all three phases of an unloaded synchronous machine are short-circuited. When there is no fault impedance and no initial current, the initial voltage is determined by the phase angle of the source voltage.
Using Kirchhoff's Voltage Law (KVL) to analyze this circuit helps determine the total asymmetrical fault current, which consists...
Using Kirchhoff's Voltage Law (KVL) to analyze this circuit helps determine the total asymmetrical fault current, which consists...
156
01:17Magnetic Damping
564
Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
564