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product manual
It is a high-efficiency DC UPS power module, specially designed for applications that require DC backup power. The module has a wide input voltage range, supports lead-acid batteries, lithium-ion, lithium polymer, and lithium iron phosphate batteries as backup batteries. It has a complete charge management function. At the same time, the on-board automatic voltage regulator circuit can directly provide voltage regulation After the DC power supply to the device. When switching between the input power supply and the battery, the output voltage is stable and the load is not affected in any way.
When the input power is on, the module will charge the battery and at the same time output the regulated power to the device. When the input power is cut off, the module automatically switches to battery power supply and provides a regulated power supply to the device. The switching time is zero and the load operation is not affected. When powered by a battery, the on-board MCU will monitor the battery voltage in real time. When the battery is discharged to the set under-voltage threshold voltage, the power supply will automatically turn off the output and enter a low-power sleep mode. The power supply can only be started when the input is re-powered or the battery voltage returns to the start-up threshold voltage.
Please note that the charging part of this module is for step-down charging, and the input power supply voltage must be 1V higher than the charging cut-off voltage of the battery to be charged. For example, if the battery uses a 12V lead-acid battery, and its charge cut-off voltage is 13.8V, the input power must be a DC power supply between 14.8V and 28V. We can choose a common 19V or 24V power adapter as the input power supply.
The module comes with a voltage stabilizing circuit with automatic buck-boosting. Regardless of the input power or battery voltage, the output voltage can be adjusted between 3V and 28V.
Scope of application
Provide backup power for a single 12V power supply computer
Access control, security backup power supply
Industrial control system backup power supply
Features
Wide input voltage range: 10～28V
High-power regulated output 100W (output 12V, 8.3A)
The output is seamlessly switched, and the input is automatically switched to battery power when the input is powered off, the output voltage is uninterrupted, and the switching time is zero.
Output voltage: It can be adjusted arbitrarily between 2～28V, or fixed output voltage type (any choice between 2～28V), please specify when purchasing. The default delivery is adjustable
Output current: 8.3A, peak value 10A
Input current: 15A max
Output over-current and short-circuit protection, even if the output terminal is short-circuited, the circuit will automatically protect
Support lead-acid batteries, lithium ion, lithium polymer, lithium iron phosphate batteries
Adjustable charging voltage (4-23V)
Adjustable charging current (0.5-5A)
3-stage high-efficiency trickle-current, constant-current, and constant-voltage charging, auto-stop when fully charged, to prevent overcharging
4 LED status indicators to realize the status indication of input power, charging, discharging and battery undervoltage
Real-time battery voltage monitoring, automatically cut off the output when over-discharged to protect the battery
Adjustable battery undervoltage protection threshold voltage
Adjustable battery start threshold voltage
Specification
Working conditions are: input voltage 16V, 12V lead-acid battery, output 12V@8A, ambient temperature 25℃
Input voltage range: 10-28V
Maximum input current (input fuse limit): 15A
Standby current: 95%
Output voltage regulation characteristics
Output voltage: 2-28V continuously adjustable
Output current: 8.3A
Output power: 100W
Conversion efficiency: >95%
Output ripple: 
J1: battery interface (battery positive and negative) 5557-2P
J2: Input power interface 5557-4P
J3: Output power interface 5557-4P
J4: Mainboard on/off control output. When used as a backup power supply for the computer, the module can control the mainboard switch through J4, and send instructions to the mainboard to shut down when the battery is undervoltage.
J5, J7:
J7 open circuit: J5 is closed to start the power supply, disconnected to close the power supply, each time the power is turned on, J5 must be disconnected and closed again to turn on the power.
J7 short circuit: J5 is closed to start the power supply, and when it is disconnected, the power supply is turned off. When the power is turned on, the power supply is automatically turned on as long as J5 is closed. J7 is open by default
Users can choose a suitable starting method according to actual practical requirements
J6: Delay setting jumper (this jumper is only used when the load is the computer motherboard, and it is not set in other situations (ie mode 0)
J8: The external lead-out terminals of LED1-LED3, lead from this socket when external LEDs are required.
VR1: Charging current adjustment potentiometer
VR2: charging voltage adjustment potentiometer
VR3: Battery start threshold voltage adjustment potentiometer
VR4: Battery undervoltage protection threshold voltage adjustment potentiometer
VR5: Output voltage adjustment potentiometer
LED1: Input power indicator, blue. On when the input power is normal
LED2: After the charging is completed, the light is on, red, and it goes out during charging
LED3: This light is on during charging, green, and goes out after charging. When the battery is discharged and the battery voltage drops below the start threshold voltage VSTART, this light flashes. When the battery voltage is lower than the undervoltage protection threshold voltage VUVP, when the power is turned on, the power cannot be started, and the light flashes twice, indicating that the battery is undervoltage.
LED4: Output voltage indicator, red, on when there is output voltage, and off when the output is off
Instructions for use
Before using this module, please do not read the following instructions carefully to avoid unnecessary losses. Setting the wrong charging voltage, charging current, and output voltage will damage the module, battery, and even the load. Before wiring, please do not confirm the positive and negative polarity of the battery and power supply, wrong or reverse connection will cause damage to the module or battery
1. Connect the input power
The voltage of the input power supply should be at least 1V higher than the charging cut-off voltage of the battery, otherwise it will not be charged. For example, the charge cut-off voltage of a 12V lead-acid battery is 13.8V. At this time, the input power supply must be 14.8V or more. 16V, 19V, 24V are all acceptable.
2. Adjust the charging voltage
Without connecting the battery, use a multimeter to monitor the voltage at the battery end of the module, and adjust the potentiometer VR2 on the board to make the charging voltage meet the requirements of the battery used. Turn down the charging voltage clockwise and turn it up counterclockwise.
Note that when adjusting the charging voltage, the charging voltage is constantly jumping, which is a pulse voltage output by the charger automatically detecting the battery. Just adjust the highest voltage of the jump to an appropriate value. Never connect the battery to adjust the charging voltage, otherwise the module or battery will be burned out.
Different batteries have different charging cut-off voltages, please adjust according to battery specifications. The charge cut-off voltage of a typical battery is as follows:
When the input power voltage is lower than the voltage recommended in the table, it will not be able to charge.
3. Adjust the charging current (the battery must be completely discharged and then adjust, otherwise the adjustment is inaccurate or the current is not large. If the battery capacity is too small, the current may not be adjusted)
After the charging voltage is adjusted, connect the battery, use an ammeter to connect the positive electrode of the electrode, turn the charging current adjustment potentiometer VR1, observe the ammeter, and adjust the charging current to an appropriate value. Turn down the charging current clockwise and turn it up counterclockwise.
Different capacity batteries have different charging currents. Generally, the charging current for fast charging is 0.3-0.4 times the battery capacity, and the slow charging is about 0.2 times the battery capacity. For example, my lithium battery is 10aH, and the charging current for fast charging can be set as: 10aH×0.4=4A, and the charging time is about 2.5 hours. The slow charge charging current can be set as: 10aH×0.2=2A, and the charging time is about 5 hours. Please refer to the specification provided by the battery manufacturer for the specific charging current.
4. Adjust the battery start threshold voltage VSTART
The battery start threshold voltage VSTART is 4 times the voltage of the test point TP3, and the following formula is used for trial calculation:
VSTART=VTP3×4 (V)
Adjust VR3, and monitor the voltage of test point TP3 with a voltmeter, and adjust it to an appropriate value.
The typical values of different battery under-voltage protection threshold voltage VUVP and startup threshold voltage VSTART are as follows:
Users can adjust themselves according to the actual situation
5. Adjust the battery undervoltage protection threshold voltage VUVP
The battery undervoltage protection threshold voltage VUVP is 4 times the voltage of the test point TP4, and the following formula is used for trial calculation:
VUVP=VTP4×4 (V)
Adjust VR4, and monitor the voltage of test point TP4 with a voltmeter, and adjust it to an appropriate value.
6. Adjust the output voltage
Short-circuit the start switch J5, the voltage regulator module works, and the output power indicator light is on. According to the power requirements of the load, adjust VR5 to adjust the output voltage to an appropriate value. Turn down the output voltage clockwise and turn it up counterclockwise.
The default factory parameter settings of this module are as follows:
Lithium battery, 3 strings, 11.1V, 3AH
Charging voltage: 12.6V
Charging current: 1A slow charge
Output voltage: 12V@8.3A
Battery start threshold voltage: 9.6V
Battery undervoltage protection threshold voltage: 9V
The adapter can be 16V, 19V, 24V and other common ones. The power of the adapter depends on the load power. If the output is to reach 12V/8.3A 100W, the adapter must be at least 130W
