BICRON
Could your product fail prematurely due to the effects of corona?
See page four for one of the major advantages Bicron can offer!
"Excellence Through Teamwork"
BICRON
Electronics Company
50 Barlow Street Canaan, CT 06018
Tel: 860 824-5125 Fax: 860 824-1137
e-mail: info@BicronUSA.com
www.BicronUSA.com
INDUCTORS SWITCHMODE TRANSFORMERS GATE DRIVERS CURRENT SENSORS
Bicron High Isolation
Voltage Magnetics offer:
Superior insulation design and
testing for stringent partial
discharge (corona) levels.
Results: Long product life
Automatic Test Equipment (ATE)
for fast, efficient, documented
testing with SPC data.
Results: 100% assured perfor-
mance to specifications
Over 30 years experience in
designing High Isolation Voltage
Systems
The Bicron Advantage
High Efficiency
High Performance
Isolation Potentials up to 40KV
Corona-free up to 20KV
High Reliability
Superior Insulation system
Applications:
Special Switchmode Power
Supplies (SMPS) for capital equip-
ment, medical systems
Gate Drives for capital equipment
The Bicron Benefits
Our engineers work with you
to optimize your circuit or
total system
ISO 9001 Certified
U.S. Design and Manufacture
with Global Sourcing Partners
Value Added Capabilities
Standard product designs easily
and economically modified for
special requirements
2497-5602
High Isolation Voltage
Magnetics
Isolated Gate Driver
Part No. B2811-01
A high fidelity SCR firing pulse transformer
used in sophisticated heavy equipment.
This transformer is designed to produce
pulses with very short rise times. It is PC
board mountable and can be secured to the
printed circuit board using a #6 screw, nut
and washer.
Isolated Gate Driver
Part No. B3521-01
A specialized Bicron transformer used in the
driving gate circuit (capacitance) of a power
MOSFET.
Under specified applications, the core will
not saturate or become non-linear. The
normal working voltage between primary
and secondary is 250Vrms.
Typical Specifications:
Turns Ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1:1:1
Primary V
sec . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500
Primary Inductance . . . . . . . . . . . . . . . . . . . . . 38mH min.
Excitation Current . . . . . . . . . . . . . . . . . . . 10mArms max
Output Requirements . . 8.5V(1000
parallel 1000pF)
Duty Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25%
Operating Frequency . . . . . . . . . . . . . . . . . . . . . . . . 10Khz
Leakage Inductance . . . . . . . . . . . . . 12H/sec shorted
Interwind Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . 130pF
Corona Inception . . . . . . . . . . . . . . . . . . . . . . . . . >300 Vac
Hi-Pot . . . . . . . . . . . . . . . . . . . . . . . . 1500Vrms for 60 sec.
Size:
Diameter . . . . . . . . . . . . . . . . . . . . 1.5-inches (38mm)
Height . . . . . . . . . . . . . . . . . . . . 0.625-inches(16mm)
Feedback Current Sensors
Part Nos. B7077-01, -02, -03
A specialized series of current sensors ideal
for isolated feedback control circuitry. These
sensors are fully encapsulated and PC board
mountable.
Typical Specifications:
Rise Time into Shorted
Secondary Winding . . . . . . . . . . . . . . . . . . . . . . . <1msec.
Output Pulse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . >6A
Drive Source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Secondary Load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 525
Turns Ratio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1:1.333
Primary V sec . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180
Primary Current . . . . 1.5Arms 60Hz fault 6Adc @85C
Primary Inductance . . . . . . . . . . . . . . . . . . . . . 0.91.4mH
Secondary Current . . . . . . . . . . . . . . . . . . . . . . . . 1.5Arms
Secondary Inductance . . . . . . . . . . . . . . . . . . . . 12.5mH
Output Requirements . . . . . . . . . . 6A Peak, 2A @1sec
Duty Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12%
Operating Frequency . . . . . . . . . . . . . . . . . . . . . 12.5KHz
Leakage Inductance . . . . . . . . . . . . . . . 8H/sec shorted
Interwind Capacity . . . . . . . . . . . . . . . . . . . . . . . . . . . 50pF
Corona Inception . . . . . . . . . . . . . . . . . . . . . . . . >1000Vac
Size:
Diameter . . . . . . . . . . . . . . . . . . . . 1.5-inches (38mm)
Height . . . . . . . . . . . . . . . . . . . . . . 0.75-inches(19mm)
Typical Specifications:
B7077-01
Number of turns . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1003
DCR
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.4
Inductance @1KHz . . . . . . . . . . . . . . . . 20mH minimum
B7077-02
Number of turns . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2005
DCR
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.5
Inductance @1KHz . . . . . . . . . . . . . . . . 80mH minimum
B7077-03
Number of turns . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 501
DCR
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.5
Inductance @1KHz . . . . . . . . . . . . . . . . . 5mH minimum
Size (All Models):
Diameter . . . . . . . . . . . . . . . . . . 0.67 inches (17mm)
Height . . . . . . . . . . . . . . . . . . . 0.80 inches (20.3mm)
Thickness . . . . . . . . . . . . . . . . . 0.38 inches (9.7mm)
High Endurance Custom Magnetics
Applied To Isolated Full Wave Power Switch
BICRON
Solid State
Driver
Solid State
Driver
Gate Driver
Current Sensor
Load
Gate Driver
Gate Driver
Isolation
Barrier
Isolation
Barrier
Gate Driver
Solid State
Driver
Solid State
Driver
HV
+HV
BICRON
High Endurance Custom Magnetics
Applied To Isolated DC-DC Converters
Switchmode Transformer
Part No. B8494-01
An example of a switchmode isolation trans-
former designed for Hi-Rel and long life.
Note the specification defining Corona and
Hi-Pot. The transformer is environmentally
sealed and cast in epoxy and contains an
electrostatic shield.
Input Inductor
Part No. B3111-01
An example of a toroidal inductor with excel-
lent energy storage capacity designed for
use as an input filter inductor in a switching
power supply.
Environmentally sealed and shock resistant,
this inductor may be bolted onto a printed
circuit board through a center mounting hole.
Typical Specifications:
Nominal Inductance . . . . . . . . . . . . . . . . . . 450H@3.6A
Operating Frequency . . . . . . . . . . . . . . . . . . . . . . 100KHz
Waveshape:
Voltage across inductor:100KHz squarewave
Positive value equal to input voltage, 4090V.
Negative value equal to output voltage,
95115V, minus input voltage.
Duty Cycle . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.56.1sec.
Input Current . . . . . . . . . . . . . . . . . . . . . . . . . . 3.6Adc max.
Output Current . . . . . . . . . . . . . . . . . . . . . . . . 1.8Adc max.
Inductance . . . . . . . . . . . . . . . . . . . 450H10%@3.6Adc
DC Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.33
Hi-Pot (Leakage Current>500A) . . . . . . 300V, 60 sec.
Overload . . . . 112% max rated current load for 8 hrs.
Thermal Shock . . . . . . . . . . . . 1 hr @-55C, 1 hr @+85C
Size:
Diameter . . . . . . . . . . . . . . . . . . . . 1.5-inches (38mm)
Height . . . . . . . . . . . . . . . . . . . . . . . . 1-inch (25.4 mm)
Output Inductor
Part No. B3414-01
A second example of a toroidal inductor, this
time designed for use as an output filter
inductor in a switching power supply.
Typical Specifications:
Nominal Inductance . . . . . . . . . . . . . . . . . . . 2.3mH @5A
Operating Frequency . . . . . . . . . . . . . . . . . . . . . . . . 20KHz
Input Current . . . . . . . . . . . . . . . . . . . . . . . 5Adc (average)
Output Current . . . . . . . . . . . . . . . . . . . . . . . . . . 5Adc max.
Inductance . . . . . . . . . . . . . . . . . . . . 2.3mH10% @5Adc
DC Resistance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.08
Hi-Pot . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300V for 60 sec.
Overload . . . . 112% max. rated current load for 8 hrs
Thermal Shock . . . . . . . . . . . . . . . . 1hr,-55C, 1hr +85C
Size:
Width . . . . . . . . . . . . . . . . . . . . . 2.5-inches (63.5mm)
Length . . . . . . . . . . . . . . . . . . . . 2.5-inches (63.5mm)
Height . . . . . . . . . . . . . . . . . . . 1.87-inches (47.6mm)
Mounting:
Four 6-32 threaded inserts, 1.62-inches (41.3mm)
square pattern
Typical Specifications
Nominal Peak to Peak Input . . . . . . . . . . . . . . . . 200Vdc
Secondary Windings(CenterTapped): . . .+5Vdc, 22Vdc
Winding Currents @50% . . . . . . . . . . . . . . . . . . . 6A, 3.5A
Output Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70W
Operating Frequency . . . . . . . . . . . . . . . . . 25KHz 10%
Inductance:
Primary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.6H
Leakage . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115H max.
Magnetizing Current @ 20Vrms, 25KHz . . 27mA max.
Regulation . . . . . . . . . User circuit/system dependant
DC Resistance:
Primary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 0.166
Secondaries . . . . . . . . . . . . . . . . . . . 0.041
, 0.014
Interwinding Capacitance . . . . . . . . . . . . . . . . . . . . 25pF
Corona:
Inception . . . . . . . . . . . . . . . . . . . . . . . . . . . . >2300Vac
Extinction . . . . . . . . . . . . . . . . . . . . . . . . . . . > 2000Vac
Hi-Pot (Leakage Current<750A)
Primary . . . . . . . . . . . . . . . . . . . . . . . 4700V for 60 sec.
Secondary . . . . . . . . . . . . . . . . . . . . . 300V for 60 sec.
Size:
Width . . . . . . . . . . . . . . . . . . . . . . . 2-inches (50.8mm)
Length . . . . . . . . . . . . . . . . . . . . . . 2-inches (50.8mm)
Height . . . . . . . . . . . . . . . . . . . 1.39-inches (35.3mm)
Data Subject to Change
Input Inductor
DC Supply
Input
PWM Controller
Solid State
Switching
Switchmode
Transformer
Isolated
Feedbacks
Isolation Barrier
Rectifiers
Output
Inductor
Isolated
DC Supply
Output
Here are three of the most
important tests Bicron
commonly applies to
verify high performance
in magnetic components:
1) Applied Voltage or Dielectric Test
A high voltage AC or DC test voltage
is applied between the windings,
and from the windings to ground.
The test is designed to verify the
adequacy of the system in terms
of coupling capacitance (AC) or
resistance (DC).
2) Induced Voltage Test
The Induced Voltage Test reveals
defects that might eventually result
in a shor ted turn and excessive
excitation current. This test is
important when winding layers are
not insulated.
3) Partial Discharge (Corona) Test
The partial discharge test is a nonde-
structive method of identifying the
potential for premature insulation
breakdown. The test is capable of
detecting small defects in the insula-
tion system that could lead to cata-
strophic transformer failure. (See
Partial Discharge (Corona) Testing).
BICRON
Electronics Company
5 0 B a r l o w S t r e e t C a n a a n , C T 0 6 0 1 8
Tel: 860 824-5125 Fax: 860 824-1137 e-mail: info@BicronUSA.com Web: www.BicronUSA.com
Long Term Reliability by Design
Corona testing requires specialized
equipment and cannot be
performed with standard dielectric
or induced voltage testers.
Bicron has over 30 years of
experience in assuring
product reliability
through a combination
of advanced design,
carefully controlled
manufacturing methods,
and state-of-the-art
product testing.
Partial discharge (Corona) can be
minimized by choosing a supplier
skilled in Corona abatement that has
ver y extensive design experi-
ence, repeatable manufacturing
processes, and the proper test
equipment and procedures to
measure Corona inception and
extinction levels.
Have your High Isolation
Voltage Magnetics been
designed with Corona
in mind?
Will your products see
premature failure
due to Corona?
Do you know your supplier's
capability to supply
reliable transformers?
Bicron's High Isolation Voltage
Magnetics are designed, manufac-
tured and tested to ensure moisture
and vibration resistance, heat dissipa-
tion, and insulation integrity.
However, it is Bicron's Corona testing
experience that clearly distinguishes
Bicron's capability from others.
Partial Discharge (Corona)
Testing:
Par tial discharge, as defined by
ASTM, is a "type of localized
discharge resulting from transient
gaseous ionization in an insulation
system when the voltage stress
exceeds a critical value."
The partial discharge (Corona) level
has a pronounced effect on the life
of the transformer.
As the voltage stress is increased,
anomalies in the insulation system
will result in partial discharge or
Corona inception. As the voltage
stress is reduced, Corona extinction
will occur.
The partial discharge cycle repeats
rapidly during the operation of the
coil. The excess energy dissipated
during these repeating cycles causes
deterioration of the insulation
system resulting in premature failure
of the coil.
0
Voltage Across
Circuit
Voltage Across
Possible Anomaly
Corona Inception
Voltage (If Anomaly)
Corona Extinguish
Voltage
Vo
ltage
+
Time
A graphical depiction of corona phenomena
PDF 
ZIP