4A Adjustable Buck Boost Converter Module with LCD Display (HW-140)

The HW-140 4A Adjustable Buck-Boost Converter Module is a versatile DC-DC voltage regulator capable of both stepping up (boost) and stepping down (buck) input voltage. It features a built-in LCD display that shows real-time voltage, current, power, and capacity data, making it an ideal solution for lab power supplies, battery projects, and precision electronics applications.

This module automatically maintains a stable output voltage regardless of whether the input voltage is higher or lower than the desired output.

Key Features

• Buck-Boost Functionality: Step-up or step-down voltage automatically
• Wide Input Voltage Range: 5V to 30V DC
• Adjustable Output Voltage: 0.5V to 30V DC
• High Output Current: Up to 4A (3A recommended)
• LCD Display: Real-time monitoring of voltage, current, power, and capacity
• High Efficiency: Up to ~90–95%
• Multiple Display Modes: Switch between parameters easily
• Compact & Integrated Design

Technical Specifications

• Model: HW-140
• Input Voltage: 5V – 30V DC
• Output Voltage: 0.5V – 30V DC (adjustable)
• Output Current:
  • Max: 4A
  • Recommended: ≤3A continuous
• Output Power: Up to ~35W
• Efficiency: Up to 95%
• Display: LCD (Voltage, Current, Power, Capacity)
• Control Interface: Buttons + Potentiometer
• Conversion Type: Buck-Boost (automatic switching)

Working Principle

This module uses a buck-boost switching regulator topology:

• If input voltage > output voltage → works in buck mode
• If input voltage < output voltage → works in boost mode
• A feedback loop continuously adjusts the duty cycle
• LCD displays real-time electrical parameters

Result: Stable output regardless of input variations

Applications

• Adjustable DC power supply
• Battery charging and testing
• DIY lab bench power supply
• Solar power systems
• Portable electronics projects
• Voltage regulation for embedded systems

Advantages

• Handles both step-up and step-down in one module
• Real-time monitoring via LCD
• High efficiency and stable output
• Easy to use and configure
• Compact and multifunctional

Usage Tips

• Always set output voltage before connecting load
• Use proper cooling for currents above 3A
• Ensure input power source can supply required current
• Use thick wires for higher current loads
• Avoid short circuits during operation

Typical Use Case

• Input: 7.4V Li-ion battery
• Output: 12V regulated supply
• Used for powering routers, LEDs, or embedded systems

Note: Images are for Illustration Purposes Only.