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Access Control Power Supply

Access control power adapter with 12V2A low power for electrical products application

Description

Switching power supply 12V 30A from Eahunt group,It has obtained UL 62368 certification, including output 5V to 30VDC, maximum power 120W, such as 12V 5a, 24V 3a, 24V 5a, 12V 10a, etc.

Our company also has UL1310 class 2 Power Supply Certificate. The provisions of UL1310 standard are that the current does not exceed 5A and the power does not exceed 100W.

Techinical parameters

Input Specification	Electrical	Tests Environmental
Voltage: 100-240VAC	Voltage Accuracy: ±3%	Hi-pot Test: 3750VAC, 60S, 5mA max
Frequency: 50-60Hz	Current Accuracy: ±3%	Lightning surge: up to 1000V (accept 3000V)
Output Specification	Efficiency:ERP	Leakage Current: 0.25mA max
Voltage:12V	Securityprotection: SCP,OVP,OCP,OTP	Burn-in Test: rate load, 40±3℃, 4 hours
Current:1A-30V	Turn On Time:15-30mS	Operating Temperature:0-40℃
Power:customized	Burn-In Test：100% Full Load	Storage Humidity 5%-95%RH

usb to dc power adapter

Common circuits of switching power supply:

1. Lightning protection circuit: when there is lightning strike and high voltage is introduced into the power supply through the power grid, the circuit composed of Mov1, Mov2, mov3: F1, F2, F3 and fdg1 shall be protected for Access control power supply.

When the voltage applied to both ends of the varistor exceeds its working voltage, its resistance value decreases, so that the high-voltage energy is consumed on the varistor. If the current is too large, F1, F2 and F3 will burn the post protection circuit

2. Input filter circuit: the double π filter network composed of C1, L1, C2 and C3 is mainly used to suppress the electromagnetic noise and clutter signal of the input power supply to prevent interference to the power supply and high-frequency clutter generated by the power supply itself to the power grid.

At the moment of power on, C5 should be charged. Due to the large instantaneous current, adding RT1 (thermistor) can effectively prevent surge current.

Because all the instantaneous energy is consumed on the RT1 resistance, the RT1 resistance decreases after the temperature increases after a certain time (RT1 is a negative temperature coefficient element). At this time, the energy consumed is very small, and the subsequent circuit can work normally.

Rectifier and filter circuit: AC voltage is rectified by BRG1 and filtered by C5 to obtain relatively pure DC voltage. If the capacity of C5 becomes smaller, the output AC ripple will increase.

12v adapter 1a