Instruction Manual
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
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Instruction Manual
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Model 1550 Switching DC Power Supply with USB Charger Output 1-36V, 0-3A
Keep this manual in a safe place for quick reference at all times.
This manual contains important safety and operation instructions for correct use of the power
supply. Read through the manual and pay special attention to the markings and labels of this unit
and equipment to be connected.
Pay special attention to these notices used in this manual:
WARNING:
Failure to observe this warning may cause injury to persons and damage to power supply
or connected equipment.
CAUTION:
Failure to observe this warning may result in damage to equipment
and Improper functioning of the power supply.
WARNING:
1. Do not use this power supply near water.
2. Do not operate or touch this power supply with wet hands.
3. Do not open the casing of the power supply when it is connected to ac mains.
4. Refer all servicing to qualified service personnel only.
5. Before replacing the AC fuse at AC socket, find out and clear up the cause first.
6. Replace the AC fuse with the same type and rating as the original fuse.
CAUTION:
1. Use a grounded 3 pin AC source.
2. This unit is for indoor use only.
3. Do not operate or place this unit in a humid, dusty, in direct sunlight location or near any heat
source.
4. Before plugging into local AC mains, check with the rating label at the back of the unit.
5. Do not block any ventilation openings of the unit.
6. This unit must be used within the specified rating; regular excessive continuous loading may
cause damage to the power supply.
2
7. The gauge size of input power cable must be at least 0.75 mm and the total length of power
cable must not exceed 3 m.
OPERATION ENVIRONMENTAL CONDITION
 10-80% R.H.
 Maximum relative humidity 80% for temperature up to 31°C decreasing linearly to 50%
relative humidity at 40°C.
 Altitude up to 2000 m
 Installation category : CAT 2
 Pollution degree: 2
 Mains supply voltage fluctuation up to ±10% of the normal voltage
INTRODUCTIONS
I.
Using the 1550 switching mode power supply
The unit is a Micro-controller based DC power supply with a total supply capability of 108
watt. By using a digital + / - keypad operation control, you can set the output voltage and
current easily. It is a clean supply with quiet operation making it ideal for laboratory, work
shop or educational applications where work bench space is limited.
The 1550 has a USB charger output, constant current operation, overvoltage
protection, floating ground design, output on/off push button and a small form factor.
II. Using the USB power output
The USB output is rated at 5 VDC and 0.4 A, according to the USB 1.1 standard. You can
power up or charge your portables such as an I-Pod, MP3 Player or Cell Phone* which
have USB power connectors for getting dc power from a PC (Personal Computer).
* - REMARKS:
NOT ALL USB DEVICES CAN BE CHARGED BY THE USB 1.1 CHARGING PORT.
SOME NEW MODELS COMPLYING WITH USB 2.0 ONLY, REQUIRE MORE POWER THAN
THE 5 V/0.4 A. PLEASE REFFERE TO THE MANUFACTURES DOCUMENTATION OF THE
DEVICE TO BE CONNECTED FOR COMPATABILITY ISSUES.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
13.
Power Switch :
Turns the power supply on–off, when it is on the front display lights up
AC Input Socket with Fuse
Concealed Fuse box ( please open the cover to get to the fuse)
V: Output Voltage Setting keypad
A: Output Current Setting keypad
“+” Increase Setting keypad.
Press to increase the numerical values
“-” Decrease Setting keypad.
Press to decrease the numerical values
Output On/Off push button.
USB Output Socket
Standard USB DC power 5V, 400mA
To charge or to power portables and cell phones
Output Terminal Positive (+) Red color
GND Terminal (:) Green color
Chassis ground terminal, normally this is to be shorted to (+) or (-) as required by user
Output Terminal Negative (-) Black color
LCD Display panel showing:
3 digit voltage, current meter, (CV) constant voltage mode, (CC) constant current
mode, Output Terminal on/off state
OPERATIONS
Ground Connection
Depending on the application, the power supply output terminals can be grounded in any one of
the following grounding conditions:
Negative ground – black (-) negative terminal is shorted to green GND terminal.
Positive ground – red (+) positive terminal is shorted to green GND terminal.
Floating ground – green terminal is not shorted to any of the output terminals.
Remarks:
When operating this power supply as a floating ground, high impedance leakage can exist
between the power supply circuitry and the chassis ground.
Basic Mode of Operation
This power supply is designed to operate as a constant voltage source or as a constant current
source. Automatic crossover to either mode of operation occurs when the load condition changes
as following:
Voltage value setting: at first, you must press the (4) keypad, then you can adjust the voltage
value to your desired value by (6) and (7) keypad.
Current value setting: at first, you must press the (5) keypad, then you can adjust the current
value to your desired value by (6) and (7) keypad.
Constant Voltage (CV), Automatic crossover & Constant Current (CC)
The power supply functions as a constant voltage source (CV) as long as the load current is less
than the preset current limiting value. When the load current is equal to or greater than the preset
current limiting value, the power supply will automatically cross over to the constant current
mode, voltage will drop, (CC) will show on the LCD display panel and it will operate as a constant
current source.
When the load current drops below the preset current limiting value, the supply returns to
constant voltage (CV) mode.
Presetting Current Limiting Value (CC)
Switch on the power supply, adjust the output voltage to about 3 V, turn off the output terminal
with push button (8), icon displays
.
Short the black and red output terminals and turn on the output terminal by (8), icon displays
, adjust the current limiting value to your desired value say x Amp by (6) and (7)
keypad. Turn off the output terminal and take out the shorting connection.
The current limiting of power supply has been preset to x Amp for the whole range of output
voltage.
Connection and Operation Procedure
1.
2.
3.
4.
After checking with the rating label plug in to AC mains.
Switch on the power supply and the LCD display should be on at the same time.
The (CV) icon should be shown on the display.
Set the current value to maximum by pressing (6) keypad if you do not require a lower
Current limiting value, otherwise do the (CC) preset limiting procedure.
5. Set your desired output voltage and then turn off the output terminal by push button (8) .
6. Connect to your load positive to positive and negative to negative.
7. Turn on the output terminal again and check if display shows (CV).
8. If display shows (CC), either your preset current limiting value is too low or your load requires
more voltage and current. You need to re-examine the voltage and current requirement of your
load and increase the voltage or current accordingly until (CV) appears.
Tracking Output Over Voltage Protection (OVP)
This is to protect the connected load in the event that the output voltage control circuit malfunctions, the maximum output voltage will not exceed 40% of the adjusted voltage value at the
time of the operation.
Over Temperature Protection
When the temperature inside the power supply becomes higher than a pre-determined value, the
output voltage and current of the power supply will automatically decrease to zero to prevent
damage to power supply. When the temperature inside the power supply returns to about 65°C
then the power supply will automatically return to operation again.
Specifications
MAIN OUTPUT:
Output Voltage Adjustable Range
Output Current Adjustable Range
Voltage Regulation
Load from 10% to 100%
Line from min to max
Ripple (rms)
Noise (Peak to Peak)
Current Regulation
Load from 10% to 100%
Line from min to max
Switching Operation Frequency
Efficiency at Max Power
Voltmeter and Ammmeter Display
Voltmeter Accuracy
Ammmeter Accuracy
1.0 – 36 VDC
0– 3A
+50 mV
+20 mV
+5 mV
+50 mV
+20 mA
+20 mA
80 kHz to 120 kHz
83% (+10%)
3 Digit
+1% rdg + 5 digits
+1% rdg + 5 digits
USB OUTPUT:
Output Voltage
Output Current
Load Voltage Regulation
Ripple & Noise (no load)
5 V (+10%)
400 mA (+10%)
80 mV (+10%)
8 mV (+10%)
Input Voltage
Full Load Input Current at 120Vac
LCD Indication
Protection
Cooling System
Dimensions (WxHxD)
Weight
100 – 120 Vac (50~60 Hz)
1.8 A (+10%)
CC, CV, Amp, Volt, Output ON-OFF
Short Circuit, Overload, Over Temperature, Over Voltage
Natural Convection
2.8 x 6.0 x 9.8 inches (70 x 150 x 250 mm)
4.4 lbs. (2 kgs)
Limited One-Year Warranty
B&K Precision warrants to the original purchaser that its products and the component parts
thereof, will be free from defects in workmanship and materials for a period of one year from date
of purchase from an authorized B&K Precision distributor.
B&K Precision will, without charge, repair or replace, at its option, defective product or component
parts. Returned product must be accompanied by proof of the purchase date in the form of a
sales receipt.
To obtain warranty coverage in the U.S.A., this product must be registered by completing the
warranty registration form on www.bkprecision.com within fifteen (15) days of purchase.
Exclusions: This warranty does not apply in the event of misuse or abuse of the product
or as a result of unauthorized alterations or repairs. The warranty is void if the serial
number is altered, defaced or removed.
B&K Precision shall not be liable for any consequential damages, including without limitation
damages resulting from loss of use. Some states do not allow limitations of incidental or
consequential damages. So the above limitation or exclusion may not apply to you.
This warranty gives you specific rights and you may have other rights, which vary from state-tostate.
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