DIY UPS-1228-16

Input Voltage: 10-28V

Output voltage:  5V - 24V (2v-28v in test)

Output current: 0-16.7A (peak value 20A)

output power:  0-200W (output 12V, 16.7A), a peak value of 240W.

Input current:  0-20A (20A fuse)

Charging voltage: 4-23V

Charging current: 1-8A

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UPS-1228-16 is an efficient DC UPS power module designed specifically for applications that require a DC backup power supply. The module has a wide input voltage range and supports lead-acid batteries, lithium-ion batteries, lithium polymers, and lithium iron phosphate batteries as backup batteries. It has complete charging management functions and an onboard automatic voltage regulation circuit that can directly provide regulated DC power to the equipment. When switching between the input power supply and the battery, the output voltage remains stable and unchanged, and the load operation is unaffected.

When the input power supply has power, the module charges the battery and outputs a regulated power supply to the device. When the input power is cut off, the module automatically switches to battery power and stabilizes the device. The switching time is zero and does not affect the load operation. When powered by the battery, the onboard MCU will monitor the battery voltage in real-time. When the battery discharges to the set under-voltage threshold voltage, the power supply automatically turns off the output and enters a low-power sleep mode. The power supply can only be started when the input is powered on again or the battery voltage is restored to the starting threshold voltage.

Please note that the charging part of this module is step-down charging, and the input power voltage must be 1V higher than the charging cut-off voltage of the charged battery in order to charge. For example, if a 12V lead-acid battery is used and its charging cut-off voltage is 13.8V, then the input power supply should 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 an automatic voltage regulator circuit, which can adjust the output voltage between 5V and 24V regardless of the input power or battery voltage.

Application scope:

• Provide backup power for computers with a single 12V power supply
• Access control and security backup power supply
• Backup power supply for industrial control system

Product Features:

• Wide input voltage range: 10-28V
• Dual LTC3780 parallel stabilized output, a continuous output power of 200W (output 12V, 16.7A), a peak value of 240W.
• Seamless output switching, automatically switches to a battery power supply when the input loses power, uninterrupted output voltage, and zero switching time.
• Output voltage: can be adjusted freely between 5-24V. The default shipment is adjustable with 12V output.
• Output current: 16.7A, peak value 20A
• Input current: maximum 20A
• Output overcurrent and short circuit protection, even if the output terminal is short-circuited, the circuit will automatically protect.
• Support lead-acid batteries (Pb), lithium-ion batteries (Li-Ion), lithium polymers (Li-Pol), and lithium iron phosphate (LiFePo4) batteries
• Adjustable charging voltage (4-23V)
• Adjustable charging current (1-8A)
• 3-stage high-efficiency trickle, constant current (CC), and constant voltage (CV) charging, self-stopping when fully charged to prevent overcharging
• 4 LED status indicator lights to indicate the status of input power, charging, discharging, and battery Undervoltage
• Real-time battery voltage monitoring, automatically cutting off output in case of over-discharge, protecting the battery
• Adjustable battery under voltage protection threshold voltage
• Adjustable battery start-up threshold voltage
• All solid state capacitors, output LC filter, low ripple output.
• 4-layer PCB design

Input/output pins:

Left side

• Bat +: Positive pole of battery
• Bat +: Positive pole of battery
• Bat -: Negative pole/ground
• Input -: Negative pole/ground
• Input +: Input positive pole
• Input +: Input positive pole

Right side

• FAN: External output power interface, can be connected to a fan or other loads. The voltage and output voltage are the same output. Weldable XH2.54 socket.
• Output +: Output positive pole
• Output -: Negative pole/ground
• Output -: Negative pole/ground
• Output +: Output positive pole

Bottom

• Vbus: Bus power supply external output interface, VBUS is the bus voltage output without voltage regulation, EN is the 5V enable signal output. Weldable XH2.54 socket.

Upper side

• I Chrg: Charging current adjustment potentiometer
• V Chrg: Charging Voltage Regulating Potentiometer
• V Start: Battery start-up threshold voltage adjustment potentiometer
• V under: Battery undervoltage protection threshold voltage adjustment potentiometer
• (for PC settings jumpers/connection part see UPS-1228-12 datasheet)

Center

• Vout: Output voltage adjustment potentiometer

Voltage Control Points

• TP3 - V Start divided by 4 (for 10.4v TP3 measurement should be 2.6v)
• TP4 - V under divided by 4 (for 9.6v TP4 measurement should be 2.4v)
• Vout, Vbat control points is outputs itself

LEDs

LED3: Input power indicator light, blue. When the input power is normal, it lights up

LED2: After charging is complete, this light will turn on in red and turn off during charging

LED1: This light is on during charging, green, and turns off after charging is complete. When the battery is discharged and the battery voltage drops below the starting threshold voltage VSTART, this light flashes. When starting the power supply when the battery voltage is below the undervoltage protection threshold voltage VUVP, the power supply cannot be started, and this light flashes twice to indicate battery undervoltage.

LED4: Output voltage indicator light, red, on when there is output voltage, off when output is turned off

LED5/LED6: Voltage stabilizing output fault indicator (PG) light, red, turns off when the output is working normally, and lights up when the output is faulty

Some other photos