1. Introduction
This manual provides detailed instructions for the EGBO 2S 24W 1A UPS DC12V/15V Power Supply Module. This module is designed to provide uninterruptible power, featuring charging, boost conversion, and comprehensive protection functionalities for 2S lithium battery applications. It is suitable for various electronic projects requiring stable power with battery backup, such as security cameras and routers.
2. Safety Precautions
- Wiring: Ensure all connections are correct before applying power. Incorrect wiring can damage the module or connected devices.
- Cable Thickness: Power input cables should be less than 20AWG (max 1 meter length). Battery cables should be 18-20AWG (max 20 cm length) and sufficiently thick to prevent interference and ensure adequate power delivery.
- Power Source: Do not connect the module to unstable or interfering power sources.
- Load Type: Avoid connecting motors or other high electromagnetic interference (EMI) negative loads directly without proper filtering.
- Overload Protection: The module has integrated chip protection that will shut down or restart if the chip temperature exceeds 120°C due to overload. Repeated overloading can damage the chip. Do not exceed the rated power of 24W for continuous use.
- Inductive Loads: For inductive loads or environments with significant interference, consider adding solid-state or tantalum capacitors as filters at both input and output ends for enhanced stability.
- LED Connection: If connecting an external LED, ensure its leads do not short-circuit or touch other power supply components.
3. Specifications
| Feature | Specification |
|---|---|
| Model | 2S V4.0CN |
| Input Voltage | DC9V/12V (up to 16V), Input current > 3A |
| Output Voltage | DC12V / DC15V (Adjustable via JP1) |
| Rated Output Power | 24W (continuous) |
| Peak Output Power | 30W (for 3-5 seconds) |
| Valley Output Power | 18W (long-term continuous load with heat dissipation) |
| Applicable Battery | 7.4V-8.4V Lithium Battery (2S configuration, 18650 supported) |
| Battery Capacity Range | 4-6AH (slow charge), 4-12AH (fast charge), up to 15AH (capacity limit) |
| Charging Current | Approx. 0.9A-1A (Fast Charge Mode) |
| Charging Voltage Range | 8.2V-8.4V (Average 8.3V) |
| Discharge Cut-off Voltage | 6.0V-6.4V (automatic disconnection) |
| Power Switching Time | < 1 millisecond |
| No-load Power Consumption | 0.2-0.3mA (< 0.5mA) |
| Operating Temperature | -40°C to 80°C |
| Dimensions | 50mm x 20mm x 0.5mm |
| Weight | 3g |
| Protection Features | Input reverse protection, Output short-circuit protection, Battery overcharge/overdischarge/short-circuit protection, Chip over-temperature protection, IN surge protection. |
4. Setup and Wiring
Before connecting, ensure the module is intact and undamaged. Follow the wiring diagram carefully.
4.1 Connection Steps
- Initial Test: Before welding, test the motherboard to ensure it functions correctly and was not damaged during transport.
- External LED (Optional): If using an external two-color LED indicator, weld its leads to the designated LED pads. Ensure the leads do not touch other components.
- Input Power: Connect your DC12V/15V power source to the IN+ and IN- terminals. Ensure the input current is greater than 3A.
- Battery Connection: Connect your 2S (7.4V-8.4V) lithium battery pack. The battery requires three cables for proper connection:
- Connect the positive terminal of the battery pack to B+.
- Connect the negative terminal of the battery pack to B-.
- Connect the middle tap (between the two cells) of the battery pack to BM.
Note: For slow charging, use batteries with 4-6AH capacity. For fast charging, use 4-12AH. The charging chip can handle up to 20-30AH for fast charge if battery quality is good.
- Output Load: Connect your device (e.g., router, camera) to the OUT+ and OUT- terminals.
- Final Power Test: After all connections are securely made, apply power and perform a functional test.
4.2 Voltage and Charging Mode Settings
- Output Voltage Adjustment (JP1): The module defaults to 12V output mode. If a short circuit occurs on JP1, it will switch to 15V output mode. This jumper is used to set the operating voltage.
- Charging Mode Adjustment (JP2): JP2 defaults to fast charge mode. This can be changed to slow charge mode by modifying the resistance (removing a resistor will halve the charging current).
5. Operation
5.1 Power Switching
The module provides seamless power switching. When the input voltage drops by 0.8V (indicating input power loss), the module automatically switches to battery power supply within less than 1 millisecond, ensuring uninterruptible operation for the connected load.
5.2 LED Indicator (External)
If an external two-color LED is connected, it provides status indications:
- Fast Blinking: No battery detected.
- LED Off: Input power is not supplied.
- Red Light On: Battery is charging.
- Green Light On: Battery is fully charged.
- Red/Green Flashing Rapidly (when battery not connected): Indicates no battery is connected.
6. Maintenance
- Regular Inspection: Periodically check all wiring connections for looseness or corrosion.
- Cleanliness: Keep the module free from dust and debris to ensure proper heat dissipation.
- Heat Management: For continuous loads near the rated 24W, ensure adequate air cooling or heat dissipation to prevent the chip from overheating. If the motherboard feels hot (70-80°C at 18W load, 70-80°C at 24W load), consider improving ventilation.
- Battery Health: Monitor the health of your connected lithium batteries. Replace them if they show signs of degradation.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| External LED blinking fast | No battery detected or battery not properly connected. | Check battery connections (B+, B-, BM). Ensure battery is a 2S lithium type. |
| External LED is off, no output | Input power not supplied or faulty. | Verify input power source (DC12V/15V) and connections to IN+ / IN-. |
| Module repeatedly restarts or shuts down | Overload condition, chip over-temperature protection triggered. | Reduce the load connected to the output. Ensure adequate heat dissipation. Check if the load exceeds 24W continuously. |
| Insufficient output power | Battery line too thin or poor connection. | Ensure battery cables are 18-20AWG and connections are solid. |
| Module gets excessively hot | High load, insufficient heat dissipation. | Ensure proper ventilation. Consider adding a heatsink or fan for sustained high loads. |
8. User Tips
- For optimal performance and longevity, avoid consistently running the module at its maximum rated power without additional cooling.
- When adjusting charging current via JP2, ensure you understand the implications for battery health and charging time. Consult battery specifications for recommended charging rates.
- Always double-check the polarity of all connections (IN+, IN-, OUT+, OUT-, B+, B-, BM) to prevent damage.
9. Warranty and Support
For warranty information, technical support, or service inquiries, please contact your original point of purchase or the EGBO customer service directly. Keep your purchase receipt as proof of purchase.
