Guangdong Kingwood Electronic Co., Ltd.
Main products:HID Automatic Headlight (HID Conversion Kits, All-In-One HID), Communication Power Supply
Contact Us
  • Contact Person : Ms. Nee Rachel
  • Company Name : Guangdong Kingwood Electronic Co., Ltd.
  • Tel : 86-20-61031498
  • Fax : 86-20-61031486
  • Address : Guangdong,Guangzhou,5/f, Block C, Dadi Industrial Park, Yongdong Road, Tangxia, Guangzhou City, Guangdong Province. China
  • Country/Region : China
  • Zip : 510630

48V20A Switching Power Supply

48V20A Switching Power Supply
Product Detailed
1.Wide range of input voltage 2.Strong protection function 3.High reliability, safety and credibility

DC48V20A High Frequency Switching Power Supply 

Model: AD4820


The 48V series high frequency switching power supply / telecom switching power supply, which is a high efficient, high performance and high reliable communication power supply. switching power supply specially designed for all kinds of communication and electronic equipments such as electronic program-controlled exchanger, microwave equipment, optical fiber communication equipment, etc. switching power supply adopts the most advanced international PWM technique and stable & reliable circuit topological structure. The switching power supply has many good points, including small volume, light weight, high efficiency, wide working temperature range, strong capacity of resisting disturbance, strong electric fence adaptive faculty, fast dynamic response, high stability, low noise and ripple, strong protection function, etc.

The 48V series high frequency switching power supply / telecom switching power supply still should be applied to NC machine tool, data processing and other equipments; they also can be used as the charge/discharge equipment of storage battery and automatically implement the protection to the storage battery.

The AD4820 is with N+1 combination of modules structure, which can be used in parallel.


N+1 combination of modules structureWide range of input voltageContinuously adjustable DC output voltageHigh precision of voltage stabilizingLow output noise rippleWith Intelligent fanStrong protection (Limiting protection of output power; Overcurrent and shortcircuit protection; Input overvoltage and low-voltage protection; Input overvoltage and low-voltage protection; Overtemperature protection)

Technical Parameter:

Technical Index

Performance Parameter

Test Conditions

Input Voltage (optional)


220Vac / 160V-290V

Output half load


220Vdc / 180V-280V

Output half load

Module Start up Surge


Output half load

Module Input Current


Output half load

Output Floating Charge Voltage


Factory settings

Modules Equalized Charge Voltage


Factory settings

Output Voltage Range

48V: 40-59VDC (adjustable)

If locking 59.0V overvoltage protection, need to restart

Output Current


Output Current-limiting (101%-105%)

Power Grid Regulation


Output from no-load to full load

Modules Load Regulation


Output from no-load to full load

Dynamic Response


20%~100% load

Output Phone Weighted Noise


Noise meter

Output Peak Noise






Working Frequency



Start up Delay Time



Equalized-current Deviation



Temperature Coefficien



Working Temperature


Radiator will shut off when temperature is  over 85°C, and which can restore.

Storage Temperature



Working Humidity



Insulation Strength

Leakage Current <10mA,1min

I    Input —output       1500 Vac

Input—Shell(Ground) 1500 Vac

Output—Shell(Ground) 500Vac

Insulation Resistance


DC: 1000V



Net Weight

Dimension (W×H×D)


Rack-mounted (19inch, 2U )

48V20A Switching Power Supply

Verified Information This information is Verified by Bureau Veritas and validity period is 2012/06/28 --- 2013/06/28 All the information below may covers both Gold Supplier and its related companies , Their Relationship will be affirmed according to china laws and regulations , also it will be clearly display in the full report >> Production Capacity: Product line name Production Line Capacity Actual Units Produced(Previous Year)
Communication Power Supply Communication Power Supply: 100,000pcs Communication Power Supply: 45,000pcs
Export Market Distribution: Market Revenue(Previous Year) Total Revenue (%)
Domestic Market confidential 81.27
North America confidential 0.38
South America confidential 0.08
Eastern Europe confidential 0.51
Southeast Asia confidential 0.38
Oceania confidential 1.54
Eastern Asia confidential 15.38
Western Europe confidential 0.23
Northern Europe confidential 0.23
Production Machinery: Machine Name Brand & Model No. Quantity Number of Year(s) Used Condition
Four-Point Welding Machine PW500J 2 5.0 Acceptable
Electric Oven 101-4 4 8.0 Acceptable
Pressure Needle Machine TD1500 5 6.0 Acceptable
ABB Robot ZRCS 1 3.0 Acceptable
Testing Machinery: Machine Name Brand & Model No. Quantity Number of Year(s) Used Condition
Digital Power Meter YOKOGAWA/2531 9 8.0 Acceptable
Dual Trace Oscilloscope 2215 60MHZ , 2215 20MHZ 18 6.0 Acceptable
Leakage Current Tester 3182, 3185 5 6.0 Acceptable
Production Flow: 1.Four-point welding 2.Proofreading focal length 3.Xenon bulb aging 4.Color temperature inspection 5.HID finished product inspection 6.Packaging production line Certification: Certified Picture Certification Name Certified By Certificate No. Product Name & Model No. Available Date-Expired Date
ISO9001:2008 WIT Assessment 15/09Q6534R31 Design and Manufacture of DA Inverter Power Supply Series, DAXDKE HID Power Series, DAX HID Power Series, AD and DD High-Frequency Switching Power Supply Series, etc 2009/12/04 --- 2012/12/03
Testing Report: Report Picture Report Name Report By Product Name & Model No. Report Date
Test Report Guangdong Meizhou Quality Supervision and Testing Xenon Lamp Power Supply & DAXDKE-35P9D 2012/06/04

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