How to Use AC-DC power converter: Examples, Pinouts, and Specs

The AC-DC Power Converter (Manufacturer Part ID: 120V-AC to 5V-DC) by AliExpress is a compact and efficient device designed to convert alternating current (AC) from a standard power outlet into direct current (DC) suitable for powering electronic devices. This component is widely used in power supply circuits for microcontrollers, sensors, and other low-power electronic systems.

• Powering microcontroller boards (e.g., Arduino, Raspberry Pi)
• Supplying DC voltage to sensors, relays, and other peripherals
• Charging USB-powered devices
• Embedded systems and IoT applications
• General-purpose DC power supplies for small electronic projects

The following table outlines the key technical details of the AC-DC Power Converter:

The AC-DC Power Converter typically has four pins or terminals for input and output connections. The table below describes each pin:

1. Input Connection:

   • Connect the AC-L terminal to the live wire of the AC power source.
   • Connect the AC-N terminal to the neutral wire of the AC power source.
   • Ensure proper insulation and secure connections to avoid electrical hazards.

2. Output Connection:

   • Connect the DC+ terminal to the positive input of your load (e.g., microcontroller, sensor).
   • Connect the DC- terminal to the ground of your load.

3. Power On:

   • Once all connections are secure, plug the AC source into a power outlet.
   • The converter will output a stable 5V DC to power your device.

• Safety First: Always handle AC connections with care. Ensure the power is turned off before making connections.
• Load Compatibility: Verify that the connected load does not exceed the maximum output current (1A).
• Heat Dissipation: If the converter operates near its maximum power rating, ensure adequate ventilation to prevent overheating.
• Polarity: Double-check the polarity of the DC output connections to avoid damaging your components.
• Testing: Use a multimeter to confirm the output voltage before connecting sensitive devices.

The AC-DC Power Converter can be used to power an Arduino UNO. Below is an example circuit and code:

1. Connect the DC+ terminal of the converter to the Arduino's 5V pin.
2. Connect the DC- terminal of the converter to the Arduino's GND pin.
3. Ensure the AC input is properly connected to a power outlet.

// Example code to blink an LED connected to pin 13 of the Arduino UNO
// Ensure the AC-DC converter is providing stable 5V DC to the Arduino

void setup() {
  pinMode(13, OUTPUT); // Set pin 13 as an output pin
}

void loop() {
  digitalWrite(13, HIGH); // Turn the LED on
  delay(1000);            // Wait for 1 second
  digitalWrite(13, LOW);  // Turn the LED off
  delay(1000);            // Wait for 1 second
}

1. No Output Voltage:

   • Cause: Loose or incorrect connections.
   • Solution: Double-check all input and output connections. Ensure the AC source is active.

2. Overheating:

   • Cause: Operating near or beyond the maximum power rating.
   • Solution: Reduce the load or improve ventilation around the converter.

3. Output Voltage Fluctuations:

   • Cause: Unstable AC input or excessive load.
   • Solution: Use a stable AC power source and ensure the load does not exceed 1A.

4. Device Not Powering On:

   • Cause: Incorrect polarity or insufficient current.
   • Solution: Verify the polarity of the DC output and ensure the load's current requirements are within the converter's limits.

Q1: Can this converter be used outdoors?
A1: No, this converter is not weatherproof. Use it only in dry, indoor environments.

Q2: Can I use this to charge a smartphone?
A2: Yes, if the smartphone's charging current requirement is 1A or less. However, ensure proper connections and safety precautions.

Q3: What happens if I connect a load requiring more than 1A?
A3: The converter may overheat, shut down, or fail. Always ensure the load does not exceed the specified current rating.

Q4: Is the output voltage adjustable?
A4: No, this converter provides a fixed 5V DC output.

By following this documentation, you can safely and effectively use the AC-DC Power Converter in your electronic projects.