SK120X DC DC Buck Boost Converter User Manual

1. Introduction

The SK120X is a versatile DC-DC buck-boost converter power module designed for laboratory and general-purpose applications. It features constant voltage (CV), constant current (CC), and constant power (CW) modes, an all-viewing-angle VA color LCD display, and various protection mechanisms. This manual provides detailed instructions for its safe and effective use.

2. Safety Precautions

• Always ensure correct polarity when connecting input and output. Reversing output polarity, especially with batteries, will damage the device.
• Battery charging requires professional knowledge. Non-professionals should not charge batteries directly to prevent fire and explosion hazards.
• Do not exceed the specified input voltage (6.0-36V) or output current (6.000A) and power (120W, up to 150W with optimal cooling).
• Ensure adequate ventilation to prevent overheating, especially when operating at higher power outputs.
• Keep the device away from moisture, dust, and corrosive environments.
• Do not attempt to disassemble or modify the device beyond what is described in this manual.

3. Technical Specifications

Protection Mechanisms:

• Input Anti-Reverse Connection: Yes
• Output Anti-Reverse: Yes
• Input Undervoltage Protection (LVP): 5.5-36V adjustable, default 5.5V
• Output Over-Voltage Protection (OVP): 0-38V adjustable, default 38V
• Output Overcurrent Protection (OCP): 0-6.2A adjustable, default 6.2A
• Output Over Power Protection (OPP): 0-150W adjustable, default 125W
• Over-Temperature Protection (OTP): 0-110°C adjustable, default 95°C
• Timeout Protection (OHP): 0-100H adjustable, default off
• Over Capacity Protection (OAP): 0-9999AH adjustable, default off
• Super Energy Protection (OPH): 0-4200KWH adjustable, default off

4. Setup and Installation

4.1 Physical Installation

1. **Mounting**: The module can be integrated into a panel. Refer to Figure 4 for recommended opening dimensions (81.6mm x 40.6mm).
2. **Ventilation**: Ensure sufficient airflow around the module, especially if operating at higher power levels (above 120W, up to 150W). The device includes an intelligent temperature-controlled fan and large-area heat sinks.

4.2 Electrical Connections

The module features plug-and-pull terminals for easy disassembly and replacement.

• **Input Power**: Connect your DC input power source (6.0V to 36V) to the IN+ and IN- terminals. Observe polarity.
• **Output Load**: Connect your load to the OUT+ and OUT- terminals. Observe polarity.
• **NTC Temperature Probe**: For over-temperature protection, connect an external 10k NTC 3950B temperature sensor to the dedicated interface. The battery icon will appear on the display once connected.
• **Optional Modules**:
  • **RS485 Module**: Connect an XY-K485X module for 485 bus control.
  • **WiFi Module**: Connect a WiFi module to enable remote control via APP and web-based networking.
  • **Infrared (IR) Receiver Module**: Connect an IR receiver module for remote control using a dedicated IR remote controller.

5. Operating Instructions

The SK120X features an all-viewing-angle VA color LCD display (over 1.8 inches) and silicone buttons with indicators for intuitive operation.

5.1 Button Functions

• **VSET Button**:
  • Short Press: Set voltage (CV).
  • Long Press: Enter or exit the data group UI.
• **SW Button**:
  • Short Press: Switch between input/output voltage display or shift cursor during setting.
  • Long Press: Enter or exit the system settings UI.
• **I-SET Button**:
  • Short Press: Set current (CC).
  • Long Press: Enter or exit the data group settings UI.
• **Encoder Button**:
  • Short Press: Switch between output power (W), capacity (Ah), energy (Wh), time (h), and temperature (°C) display in rotation.
  • Long Press: Turn on/off the key lock.
• **Power Button (ON/OFF)**:
  • Short Press: Turn on/off the power output.
  • Long Press: Reset the capacity (Ah) and energy (Wh) by long pressing.

5.2 Setting Voltage and Current

1. On the main UI, short press the VSET button to set the voltage. The LCD will display "SET" in the lower row, and "CV" will flash to indicate that the voltage setting position is selected and blinking.
2. Then, short press the SW button or rotate the encoder button to switch the voltage setting position. Adjust the value by rotating the encoder.
3. After setting is complete, short press the VSET button to exit and save.
4. To set the current, short press the I-SET button, and the setting steps are the same as for voltage.

5.3 Quick Setting of Voltage or Current (FET)

In the system parameter settings UI, set the parameter FET to CV or CC. Rotate the encoder on the main UI to enter the voltage or current setting UI. Rotate the encoder to quickly set the voltage or current.

5.4 Display Modes

• **Input/Output Voltage Display**: On the main UI, short press the SW button briefly to switch between input and output voltage displays.
• **Power/Capacity/Energy/Time/Temperature Display**: On the main UI, short press the encoder button briefly to switch between displaying power (W), capacity (Ah), energy (Wh), time (h), and temperature (°C) in rotation.

5.5 Key Lock Function

On the main UI, press and hold the encoder button for 2 seconds to lock the set voltage and current to prevent accidental modification. Press and hold the encoder button for another 2 seconds after locking to unlock.

5.6 Data Group Function

The product has 10 data groups (Cd0 to Cd9). Press and hold the VSET button on the main UI to access the data group UI. You can press VSET/I-SET briefly to switch between constant voltage (CV) and constant current (CC) settings within a data group. It supports quick viewing and modification of voltage and current, as well as SW shift operation. After confirming the data group, press and hold the VSET/SW button or press the encoder button briefly to select the desired data group.

5.7 System Parameter Settings

Press and hold the SW button on the main interface to enter the system settings menu. The first parameter is the buzzer setting (bEP). Press VSET briefly to select the next parameter, and press I-SET briefly to select the previous parameter. After completing the settings, press and hold the SW/encoder button to exit the settings.

5.8 CV/CC/CW Functions

• **Constant Voltage (CV)**: When the load current is less than the set constant current value, the power supply operates in constant voltage mode, with adaptive output current.
• **Constant Current (CC)**: When the load current exceeds the set constant current value, the power supply automatically enters constant current mode, with adaptive output voltage.
• **Constant Power (CW)**: When enabled, the power supply maintains a constant output power. The corresponding voltage is calculated based on Ohm's law and the constant power algorithm.

**To enable/disable Constant Power**: Press and hold SW on the main UI to enter system settings. Press I-SET/VSET briefly to switch to the "CP" constant power switch option. Press ON to enable constant power and OFF to disable it. After enabling, press I-SET briefly on the main interface to modify the value of constant power.

5.9 MPPT Solar Charging

The SK120X supports MPPT (Maximum Power Point Tracking) solar charging. When an external temperature probe is connected, it also supports over-temperature protection, automatically stopping charging if the temperature exceeds the set limit.

5.10 Remote Control and Software

The SK120X can be controlled remotely via optional modules:

• **IR Remote**: Use the dedicated Sinilink infrared remote controller with an IR receiver probe for quick voltage/current setting and recalling data sets.
• **WiFi/Network Control**: With a WiFi module, the device can be controlled via the Sinilink mobile APP (Android/iOS) or PC host computer software, enabling LAN penetration and real-time communication.
• **Multi-Serial Port Host Computer Software**: The software supports multi-serial port communication, allowing control of up to 247 devices on a single serial port or over a thousand in a clustered environment. It also offers batch control and administrative accounts for secure parameter management.

6. Maintenance

6.1 Firmware Upgrade

The product supports firmware upgrades to obtain new functions. Currently, it supports firmware upgrades through the WiFi module. Future upgrades via multi-serial port host computer software are under development.

**Important**: Do not power off during the product upgrade process. If the product upgrade fails, you can press and hold the power button to power on the product and force it into the upgrade mode.

6.2 Cleaning

Ensure the device is powered off and disconnected from all power sources before cleaning. Use a soft, dry cloth to wipe the exterior. Do not use liquid cleaners or solvents.

6.3 Component Replacement

The plug-and-pull terminals are designed for easy disassembly and replacement, facilitating maintenance if needed.

7. Troubleshooting

8. User Tips

• **Buck-Boost Capability**: The SK120X is a true buck-boost converter, meaning it can both step down (buck) and step up (boost) the voltage, making it highly versatile for various applications.
• **Safety First for Batteries**: When charging batteries, always double-check the polarity. The device lacks output reverse connection protection, and incorrect connection can cause damage. Ensure you have the necessary professional knowledge for battery charging.
• **Optimal Power Output**: While rated at 120W, the SK120X can achieve up to 150W under optimal cooling conditions. Consider enhancing cooling if you plan to consistently operate at higher power levels.
• **Utilize Data Groups**: The 10 data groups (Cd0-Cd9) are excellent for saving frequently used voltage and current settings, allowing for quick recall and switching between different configurations.
• **Remote Control Convenience**: If your application requires frequent adjustments or monitoring from a distance, consider adding the optional WiFi or IR remote control modules for enhanced convenience.

9. Warranty and Support

For technical support, troubleshooting assistance, or inquiries regarding your SK120X DC DC Buck Boost Converter, please contact your retailer or the manufacturer's customer service. Keep your purchase receipt for any warranty claims.

The product supports firmware upgrades to introduce new features and improvements. Please refer to the official Sinilink website or contact support for the latest firmware versions and upgrade procedures.

The device supports the standard Modbus protocol for serial communication, allowing for integration into various control systems.