Cirkit Designer
Your all-in-one circuit design IDE
Home /
Component Documentation
How to Use PoE PSU 48V DC: Examples, Pinouts, and Specs
Design with PoE PSU 48V DC in Cirkit DesignerIntroduction
The Power over Ethernet (PoE) Power Supply Unit (PSU) 48V DC is an electronic component designed to deliver power to PoE-enabled devices through Ethernet cabling. This allows for the transmission of both power and data over a single network cable, simplifying wiring and reducing installation costs. Common applications include powering IP cameras, wireless access points, VoIP phones, and other network devices that support PoE.
Explore Projects Built with PoE PSU 48V DC
Optiplex Micro and PoE Camera Surveillance System with Ethernet Switching
This circuit describes a networked system where an Optiplex Micro computer is powered by a PC Power Supply and connected to a PC Screen via HDMI for display output. The computer is networked through an Ethernet Switch, which also connects to two PoE Cameras and a Toyopuc PLC. The Ethernet Switch is powered by a PoE PSU 48V DC, and all AC-powered devices are connected to a common 220V AC source.
Open Project in Cirkit Designer24V Pushbutton Control Interface with 40-Pin Connector
This circuit consists of a 24V power supply unit (PSU) connected to four pushbuttons. Each pushbutton is wired such that pressing it will send a 24V signal to a corresponding general-purpose input (GP In) on a 40-pin connector. The common return path for the pushbuttons is connected to the 0V of the PSU, which is also connected to the common (Com) for input pins on the 40-pin connector, completing the circuit for each button press.
Open Project in Cirkit DesignerBattery-Powered UPS with Step-Down Buck Converter and BMS
This circuit is a power management system that steps down a 240V AC input to a lower DC voltage using a buck converter, which then powers a 40W UPS. The UPS is controlled by a rocker switch and is backed up by a battery management system (BMS) connected to three 3.7V batteries in series, ensuring continuous power supply.
Open Project in Cirkit DesignerESP32-Based Wi-Fi Controlled 24V Input/Output Interface Module
This circuit uses an ESP32 microcontroller to interface with a 3.3V PNP to 24V NPN photoelectric isolation module, which in turn connects to a 40-pin connector for general-purpose input and output. The 24V power supply provides the necessary voltage for the isolation module and the 40-pin connector, enabling the ESP32 to control and monitor high-voltage signals safely.
Open Project in Cirkit DesignerExplore Projects Built with PoE PSU 48V DC
Optiplex Micro and PoE Camera Surveillance System with Ethernet Switching
This circuit describes a networked system where an Optiplex Micro computer is powered by a PC Power Supply and connected to a PC Screen via HDMI for display output. The computer is networked through an Ethernet Switch, which also connects to two PoE Cameras and a Toyopuc PLC. The Ethernet Switch is powered by a PoE PSU 48V DC, and all AC-powered devices are connected to a common 220V AC source.
Open Project in Cirkit Designer24V Pushbutton Control Interface with 40-Pin Connector
This circuit consists of a 24V power supply unit (PSU) connected to four pushbuttons. Each pushbutton is wired such that pressing it will send a 24V signal to a corresponding general-purpose input (GP In) on a 40-pin connector. The common return path for the pushbuttons is connected to the 0V of the PSU, which is also connected to the common (Com) for input pins on the 40-pin connector, completing the circuit for each button press.
Open Project in Cirkit DesignerBattery-Powered UPS with Step-Down Buck Converter and BMS
This circuit is a power management system that steps down a 240V AC input to a lower DC voltage using a buck converter, which then powers a 40W UPS. The UPS is controlled by a rocker switch and is backed up by a battery management system (BMS) connected to three 3.7V batteries in series, ensuring continuous power supply.
Open Project in Cirkit DesignerESP32-Based Wi-Fi Controlled 24V Input/Output Interface Module
This circuit uses an ESP32 microcontroller to interface with a 3.3V PNP to 24V NPN photoelectric isolation module, which in turn connects to a 40-pin connector for general-purpose input and output. The 24V power supply provides the necessary voltage for the isolation module and the 40-pin connector, enabling the ESP32 to control and monitor high-voltage signals safely.
Open Project in Cirkit DesignerTechnical Specifications
General Specifications
| Parameter | Value | Description |
|---|---|---|
| Output Voltage | 48V DC | The DC voltage supplied to the device. |
| Output Current | Varies | Maximum current the PSU can provide. |
| Power Rating | Varies | Total power output capacity. |
| PoE Standard | IEEE 802.3af/at | Compatibility with PoE standards. |
| Operating Temperature | -10°C to +45°C | Suitable temperature range for operation. |
Pin Configuration and Descriptions
| Pin Number | Name | Description |
|---|---|---|
| 1 | V+ | Positive voltage output (48V DC) |
| 2 | V- | Ground reference for the voltage output |
| 3 | DATA+ | Data pair positive (if applicable) |
| 4 | DATA- | Data pair negative (if applicable) |
| 5 | LED+ | Anode for status LED (if present) |
| 6 | LED- | Cathode for status LED (if present) |
Note: The actual pinout may vary depending on the specific model and manufacturer. Always refer to the manufacturer's datasheet for exact pin configuration.
Usage Instructions
Integration into a Circuit
- Connection to PoE Device: Connect the V+ and V- pins to the power input of the PoE-enabled device, ensuring correct polarity.
- Data Connection (if applicable): If the PSU also carries data, connect DATA+ and DATA- to the respective data input pins on the device.
- Status LED (if present): Connect LED+ and LED- to the status LED pins if you wish to have a visual indicator of the PSU status.
Best Practices
- Cable Quality: Use high-quality Ethernet cables to ensure reliable power and data transmission.
- Overload Protection: Ensure the connected device does not exceed the PSU's current and power ratings.
- Ventilation: Provide adequate ventilation around the PSU to prevent overheating.
- Compliance: Use the PSU with devices that comply with the same PoE standards (IEEE 802.3af/at).
Troubleshooting and FAQs
Common Issues
- No Power to Device: Check connections for proper polarity and ensure the cable is not damaged.
- Intermittent Power: Verify that the PSU and device are not overheating and that the cable quality is adequate.
- Device Not Recognizing Power: Ensure the device is PoE-compatible and that the PSU meets the required PoE standard.
FAQs
Q: Can I use this PSU with non-PoE devices? A: No, this PSU is designed for PoE-enabled devices only.
Q: What is the maximum cable length I can use with this PSU? A: The maximum recommended length for Ethernet cables with PoE is 100 meters.
Q: Can I daisy-chain multiple PoE devices with this PSU? A: Daisy-chaining is not recommended as it may exceed the PSU's power capacity and violate PoE standards.
Q: Is this PSU compatible with all PoE standards? A: This PSU is compatible with IEEE 802.3af/at standards. Check your device's specifications to ensure compatibility.
Example Code for Arduino UNO
This section provides an example of how to control a PoE-powered device with an Arduino UNO. The code demonstrates a simple on/off toggle for a PoE-powered LED light.
// Define the control pin for the PoE PSU
const int poeControlPin = 2;
void setup() {
// Initialize the control pin as an output
pinMode(poeControlPin, OUTPUT);
}
void loop() {
// Turn on the PoE-powered device
digitalWrite(poeControlPin, HIGH);
delay(1000); // Wait for 1 second
// Turn off the PoE-powered device
digitalWrite(poeControlPin, LOW);
delay(1000); // Wait for 1 second
}
Note: This example assumes that the Arduino UNO controls a relay or similar device that switches the PoE PSU on and off. The Arduino itself cannot directly switch the 48V DC power.
Remember to consult the datasheet and technical resources provided by the manufacturer for the most accurate and specific information regarding the PoE PSU 48V DC component.