Introduction

This interactive simulation allows you to explore the behavior of a boost converter, a DC-DC power converter that steps up voltage from its input to its output. Unlike a buck converter, the boost converter produces an output voltage higher than the input voltage.

Boost Converter Basics

The boost converter operates on the principle of energy storage and release:

• Switch ON: Energy is stored in the inductor from the input source
• Switch OFF: Stored energy is released to the output through the diode
• Output Voltage: Vout = Vin / (1 - D), where D is the duty cycle
• Voltage Gain: Higher duty cycle = higher voltage gain

Getting Started

1. Set your circuit parameters (input voltage, inductor, capacitor, load resistor)
2. Adjust the duty cycle (10-85% for stable operation)
3. Set the switching frequency and simulation time
4. Click "Run Simulation" to see the results
5. Use the waveform visualization tools to analyze the behavior

Key Differences from Buck Converter

• Voltage Relationship: Vout > Vin (step-up operation)
• Current Relationship: Iin > Iout (current step-down)
• Energy Flow: Energy stored during switch ON, released during switch OFF
• Right Half Plane Zero: Makes control more challenging than buck converters

Circuit Parameters

• Input Voltage: The DC voltage source (typically lower than desired output)
• Inductor: Energy storage element, critical for boost operation
• Capacitor: Smooths output voltage ripple
• Load Resistor: Represents the load connected to the converter output

Operation Modes

• CCM (Continuous Conduction Mode): Inductor current never reaches zero
• DCM (Discontinuous Conduction Mode): Inductor current reaches zero during switching cycle
• Boundary: Critical inductance value determines the boundary between CCM and DCM

Design Considerations

• Duty Cycle Limit: Practical limit around 80-85% due to parasitic losses
• Inductor Selection: Larger inductance reduces current ripple but increases size
• Right Half Plane Zero: Affects stability, requires careful compensation
• Diode Selection: Fast recovery diode recommended for high frequency operation

Waveform Analysis

Key waveforms to observe:

• Inductor Current: Triangular waveform, increases during switch ON
• Switch Voltage: High when switch is OFF (Vout level)
• Diode Current: Conducts only when switch is OFF
• Output Voltage: Should be Vin/(1-D) with some ripple

Tips for Best Results

• Start with moderate duty cycles (50-70%) for stable operation
• Use sufficient output capacitance to minimize voltage ripple
• Consider inductor current ripple when selecting components
• Higher switching frequency reduces component size but increases switching losses
• Monitor component stress levels to ensure reliable operation