Introduction

In this teardown, we take a closer look at the ASPOWER 75W 12V internal power supply—a custom-built solution tailored for Hikvision’s NVR network hard disk recorders. Built around a flyback PWM architecture and featuring a unique 10-pin private output header, this unit is far from your average power supply.

Teardown of the ASPOWER U1A-G10075-S-A1 75W 12V Power Supply-Chargerlab

Designed for high-reliability industrial environments, this power supply is built to run 24/7 without a break. But what does it take to maintain performance in a server room under conditions like power grid instability and the high-surge load of spinning hard drives? We dive into the internal design and high-spec hardware that make this reliability possible.

Product Appearance

Encased in a durable metal chassis, this 75W internal power supply from ASPOWER utilizes a proprietary 10-pin connector. Its precision design is built to support the rigorous, non-stop demands of professional-grade security infrastructure.

The chassis is secured with screws, and the power supply nameplate is affixed to the bottom.

Power Supply Nameplate Specs:

Model: U1A-G10075-S-A1

Input: 100-240VAC, 47-63Hz, 2A

Output: +12V/6.25A, 75W MAX

Manufacturer: Shenzhen EDAC Electronics Co., Ltd.

Certifications: CCC, UKCA, CE, KC

The input end is equipped with an IEC C14 power inlet, an integrated power switch, and a cooling fan.

The cooling fan is secured in place using screws.

The opposite end is designed with a louvered ventilation grille.

The output cable harness is bundled and secured with cable ties.

The proprietary 10-pin power connector, specifically customized for Hikvision NVR security equipment.

The length of the PSU is about 101.26mm (3.987 inches).

The width of the PSU is about 125.06mm (4.924 inches).

The height of the PSU is about 63.48mm (2.499 inches).

That's how big it is in the hand.

The weight is about 465g (16.40 oz).

Teardown

Remove the screws to open the chassis.

The yellow-green grounding wire is connected to the metallic chassis, providing effective leakage protection.

The live and neutral lines are connected via a pluggable connector design.

The internal PCBA module is secured in place with screws.

The cooling fan also utilizes a pluggable connector, while the output wire harness is sleeved with protective tubing.

Remove the screws to extract the PCBA; the interior of the opposing chassis half is lined with a Mylar sheet for electrical insulation.

The cooling fan is from Protechnic, model MGA6012MR-A15, spec DC 12V and 0.18A.

The primary side of the single-sided PCB features components such as the fuse, common-mode choke, filtering caps, and transformer. The layout allows for ample clearance, and both the primary-side switching MOSFET and secondary-side synchronous rectifier MOSFET are equipped with dedicated heatsinks for thermal management.

The back of the PCB features the master control chip, operational amplifiers, transistors, and other components. The isolation between the primary and secondary stages is clearly delineated.

The time-delay fuse, 5A, 250V.

The varistor, model VDR10D561K, is incorporated to provide effective overvoltage surge protection.

The common-mode choke, designed for effective EMI interference suppression.

The two blue Y-caps are from SHM.

Here is the safety X2 cap.

The other common-mode choke.

The rectifier bridge is from HY, model GBU406, spec 4A 600V.

The NTC thermistor is from SHIHENG, belongs to the MF72 series, model 3D11.

The high-voltage electrolytic filter cap is from Acon, spec 150μF/450V.

The power supply caps for the master control chip are from Acon, specs 22μF/50V.

The master control chip is from On-Bright, model OB5282CP, which is a high-voltage, green-mode current-mode PWM flyback power control IC. Packaged in an SOP8 format, it is specifically engineered for offline AC-DC flyback switching power supplies, suitable for applications including power adapters, open-frame power supplies, and dummy load equipment.

The primary switching MOSFET is from JSMC, model JCS10N80FC, NMOS, 800V and 1Ω, and housed in a TO-220F package.

The color-coded resistor.

Here is the other color-coded resistor.

The high-voltage ceramic cap, 1kV.

Here is the another one.

This is the transformer.

The optocoupler, model CT 817C, used for output voltage feedback and protection.

The blue Y-cap is from STE.

The Schottky rectifier diode is from LIPTAI, model M30T100CT, spec 100V/30A, housed in a TO-220 package.

The thermistor, used for temperature sensing.

The three output filtering caps are from SAMXON, with two of them spec 3300μF/16V.

The other one, spec 1500μF16V.

The operational amplifier is from UTC, model LM358G. This is a dual-channel general-purpose operational amplifier featuring a wide single-supply operating range of 3V to 32V, housed in an SOP-8 surface-mount package.

The transistor, marked BCR, is employed for cooling fan control.

The cooling fan power supply filter cap is from Acon, spec 47μF/35V.

Well, those are all components of the ASPOWER U1A-G10075-S-A1 75W 12V Power Supply.

Summary of ChargerLAB

Engineered as a custom powerhouse for Hikvision NVRs, this ASPOWER 75W internal power supply features a heavy-duty, all-metal chassis that exudes a strong industrial feel. However, cross-compatibility is highly restricted by its specialized, non-standard 10-pin output terminal, making standard PC modifications out of the question. On the cooling front, side intake grilles team up with a built-in smart thermal fan to create an optimized airflow duct, guaranteeing rock-solid temperature management even under extended full-load conditions.

Our teardown confirms that this unit pulls no punches regarding safety and EMC filtering. Built on a time-tested flyback PWM topology with an RCD snubber circuit to suppress voltage spikes, it delivers an all-around defense system—from lightning strikes and high-voltage insulation to stable regulation and fault-latching safeguards. It is tailor-made to endure the grueling demands of 24/7 continuous operation in security environments, making it a stellar example of a purpose-built industrial supply.