SG3525 LM358 Inverter Driver Board 12V 24V

SG3525 LM358 Inverter Driver Board is a specialized control module designed to create pure sine wave or modified sine wave power inverters, converting low-voltage DC (12V or 24V) into high-voltage AC (220V/110V). This board utilizes the robust SG3525 Pulse Width Modulation (PWM) controller chip to generate precise switching signals and the versatile LM358 operational amplifier for error feedback and voltage regulation. You can easily adjust the output frequency and voltage feedback, giving you fine-tuned control over the inverter’s performance. This module simplifies the complex task of designing the control stage for a high-power inverter, allowing you to focus on selecting the power MOSFETs and output transformer. It is an essential component for DIY solar inverters, backup power supplies, and portable AC power sources.

Key Features:

• Dual Voltage Compatibility: Supports wide input voltage operation from 12V to 24V DC, adapting to various battery configurations.
• SG3525 PWM Controller: Features the industry-standard SG3525 for reliable, high-frequency, push-pull PWM signal generation.
• LM358 Error Amplifier: Integrates the LM358 op-amp to handle voltage feedback, ensuring stable and regulated AC output.
• Adjustable Frequency and Voltage: Includes onboard potentiometers that let you precisely set the output frequency (typically 50Hz/60Hz) and output voltage amplitude.
• Drive Protection: Incorporates robust output stage components to drive external high-power MOSFETs or IGBTs reliably.

Technical Specifications:

• Input DC Voltage Range: 12 V / 24 V DC (User selectable via jumper/wiring)
• Output AC Waveform: Modified Sine Wave or Pure Sine Wave (Requires additional filtering/components)
• PWM Control Chip: SG3525
• Error Feedback Chip: LM358
• Output Frequency: Adjustable, typically 50 Hz to 60 Hz
• Output Drive Current: Sufficient to drive external MOSFET gates (Low power signal only)

Mechanical Specifications:

• Mounting: Four mounting holes allow you to securely fix the PCB within an enclosure.
• Indicators: Includes an LED indicator for power or operational status.
• Connections: Utilizes screw terminals for robust and secure input and output wiring.

Dimensions:

• Length: ≈ 40 mm to 50 mm
• Width: ≈ 30 mm to 40 mm
• Height: ≈ 15 mm
• Weight: ≈ 15 g to 25 g

Pinout and Wiring:

• DC Input (+V / GND): Connect these terminals to your 12V or 24V DC battery supply.
• PWM Outputs (OUT A / OUT B): These terminals deliver the complementary square wave signals. You will connect them directly to the gates of your external N-channel power MOSFETs (via suitable gate resistors).
• Feedback Input (VFB): Connect this pin to a divided and rectified version of the high-voltage AC output for regulation.
• Frequency Adjust (Potentiometer): Adjust this component to set the desired output frequency (e.g., 50Hz or 60Hz).

Datasheet Reference:

• Download SG3525/LM358 Control Board Manual

Commonly Used in:

• DIY Power Inverters: The primary control stage for custom high-power DC-to-AC conversion projects.
• Solar Power Systems: Forming the intelligent heart of off-grid solar inverters.
• Uninterruptible Power Supplies (UPS): Providing the regulated AC signal in backup battery systems.

Applications:

• Portable AC Power: Building inverters for use in vehicles, camping, or remote locations.
• Benchtop Power Supplies: Creating regulated low-frequency AC sources for testing or small motors.
• Educational Electronics Projects: Teaching the principles of PWM and closed-loop control in power electronics.

Equivalent Models:

• TL494 Driver Boards: A common, slightly simpler alternative PWM controller board for power supplies and inverters.
• Dedicated Sine Wave Inverter Modules: Higher-cost, integrated modules that include the sine wave shaping circuitry on the board.
• EG8010 Driver Boards: Specialized boards that natively generate a pure sine wave signal using a digital controller.

Package Includes:

• 1 x SG3525 LM358 Inverter Driver Board