DC UPS Power Supply Module Uninterruptible Power Supply Computer Access Guard Security Industrial Control DC Backup Power Supply

Product modeL: UPS-1228-12

Product description

UPS-1228-12It is a high efficiency DC UPS power module designed for applications requiring DC backup power supply. The module has a wide input voltage range and supports lead-acid batteries, lithium ion batteries, lithium polymer batteries and lithium iron phosphate batteries as backup batteries. It has perfect charging management functions. At the same time, the on-board voltage-stabilizing circuit can directly provide DC power supply to the equipment after stabilization. When switching between the input power supply and the battery, the output voltage is stable and the load work is not affected.

When the input power supply is electrified, the module charges the battery and outputs the regulated power supply to the equipment. When the input power is cut off, the module is automatically switched to the battery power supply, and the regulated power supply is provided to the equipment. The switching time is zero, which does not affect the load work. When the battery is powered, the on-board MCU monitors the battery voltage in real time. When the battery discharges to the set undervoltage threshold voltage, the power automatically closes the output and enters the low-power sleep mode. The power supply can be started only when the input is re-energized or the battery voltage is restored to the starting threshold voltage.

Please note that the charging part of this module is step-down charging. The input voltage must be 1V higher than the charging cut-off voltage of the charged battery before charging. For example, the battery uses 12 V lead-acid batteries, whose charging cut-off voltage is 1Three8V, so the input power supply should choose the DC power supply between 14.8V and 28V. We can choose the common 19V or 24V power adapter as the input power supply.

The module has its own voltage stabilization circuit with automatic boost and buck. No matter how many volts the input power supply or battery voltage is, the output voltage can be arbitrarily adjusted between 3V and 28V.

Unless otherwise specified, the working conditions are: input voltage 16V, 12V lead-acid battery, output 12V8A, ambient temperature 25Temperature

Charging characteristics

Output Voltage Stabilization Characteristic

Product pictures

block diagram

Wiring diagram:

J1Battery interface (positive and negative) 5557-2P

J2Input power interface 5557-4P

J3Output power interface 5557-4P

J4Main board on/off control output. As the backup power supply of the computer, the module can control the motherboard switch through J4, and send instructions to the motherboard to shut down when the battery is under-voltage.

J5J7:
J7 Open Circuit: J5 closes the start power supply, and when it is disconnected, it closes the power supply. Every time the power is turned on, it needs to be disconnected and closed again to turn on the power supply.
J7 Short Circuit: J5 closes the starting power supply, disconnects the power supply, and automatically starts the power supply as long as J5 closes. J7 default open

Users can choose appropriate startup mode according to practical requirements.

J6Delay setting jumper (this jumper is only used when the load is the computer motherboard, other cases are not set (mode 0)

J8: External lead-out terminal of LED 1-LED 3. When external LED is needed, it is drawn from the socket.

VR1Charging Current Regulating Potentiometer

VR2Charging Voltage Regulating Potentiometer

VR3Battery Start Threshold Voltage Regulating Potentiometer

VR4Battery undervoltage protection threshold voltage regulator potentiometer

VR5Output Voltage Regulating Potentiometer

LED1Input power indicator, blue. Bright when input power is normal

LED2When the charge is completed, the lamp will turn on, red, and the charge will go out.

LED3When charging, the light is on, green and goes out after charging. When the battery discharges, the battery voltage drops to start threshold voltage V_STARTThe light flickers below. Battery voltage below undervoltage protection threshold voltage V_UVPWhen the power supply is started, the power supply cannot start. The lamp flickers twice, indicating that the battery is under-voltage.

LED4Output Voltage Indicator, red, when the output voltage is on, when the output is off.

Instructions

Before using this module, do not read the following instructions carefully to avoid unnecessary losses. The incorrect charging voltage, charging current and output voltage will damage modules, batteries and even loads. Do not confirm the positive and negative polarity of batteries and power sources before wiring. Misconnection or reverse wiring will cause damage to modules or batteries.

1. Connect the input power
The voltage of the input power supply should be at least 1V higher than the charge cut-off voltage of the battery, otherwise the battery will not be charged. For example, the cut-off voltage of 12 V lead-acid batteries is 13.8 V. When the input power supply is above 14.8 V, 16V, 19V and 24V can be used.

2. Adjusting Charging Voltage
Without batteries, the multimeter is used to monitor the voltage at the battery end of the module, and the potentiometer VR2 on the board is adjusted to make the charging voltage meet the requirements of the batteries used.Adjust charging voltage clockwise and increase counterclockwise.
When adjusting the charging voltage, the charging voltage keeps jumping, which is a pulse voltage output by the charger when it detects the battery automatically. Just adjust the maximum voltage of the jump to the appropriate value.Never connect the battery to adjust the charging voltage, otherwise it will burn the module or battery.
Different batteries have different charging cut-off voltages. Please adjust them according to battery specifications.The cut-off voltage of typical batteries is as follows:

When the input power supply voltage is lower than the recommended voltage in the meter, it will not be charged.

3. Adjusting Charging Current(Batteries should be completely discharged and re-adjusted, otherwise the adjustment is not allowed or the current regulation is not large. Battery capacity is too small and may cause the current to be out of tune.
After charging voltage is adjustedThen connect the battery, use the ammeter string in the positive electrode, turn the charging current regulator VR1, observe the ammeter, and adjust the charging current to the appropriate value. Reduce the charging current clockwise and increase it counterclockwise.
The charging current of batteries with different capacities is different. Generally, the fast charging current is 0.3-0.4 times of the battery capacity and the slow charging current is about 0.2 times of the battery capacity. For example, my lithium-ion battery is 10aH. At this time, the fast charging current can be set to 10aH * 0.4 = 4A, and the charging time is about 2.5 hours. The slow charging current can be set to 10 aH *0.2=2A, and the charging time is about 5 hours. Specific charging current should also be based on specifications provided by battery manufacturers.

4. adjustBattery Start Threshold VoltageV_START

Battery Start Threshold VoltageV_STARTTest pointTP3Voltage4timesPress the following formula for trial calculation:
V_START=V_TP3X4 (V)
adjustVR3At the same time, monitoring test points with voltmeterTP3Adjust the voltage to the right value.

Threshold Voltage of Undervoltage Protection for Different BatteriesV_UVPAnd start threshold voltageV_STARTTypical values are as follows:

6. Adjust the output voltage

Short-circuit the start switch J5, the voltage regulator module works, and the output power indicator 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 factory parameters of this module are set 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

Adapters can be more commonly used, such as 16V, 19V, 24V. The power of the adapter depends on the power of the load. If the output is to reach 12V / 8.3A 100W, the adapter must be at least 130W.

 

structure size: