BY MICROPAC

TM

Industrial Power Controller

Micropac Industries

cannot assume any responsibility for any circuits shown, or represent that they are free from patent infringement.

Micropac

reserves the right to make changes at any time in order to improve design and to supply the best product possible.

Micropac Industries, Inc.

 905 E. Walnut St., Garland, TX 75040  (972) 272-3571  Fax (972) 494-2281

©March 2013

www.micropac.com

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Pg. 8 of 9

ISOLATION

GND

3

1

6

2

4

5

TRIP

STATUS

CONTROL

CENTRAL

DIGITAL

CONTROL

UNIT

I²t

&

OVERCURRENT

PROTECTION

CIRCUIT

TRANSFORMER

ISOLATED

CONTROL

CIRCUIT

OPTOCOUPLER

OPTOCOUPLER

LOW SIDE

SWITCH

DC or AC

BUS V+

LOAD

6

5

DC

CIRCUIT

SNUBBER

DC

CIRCUIT

SNUBBER

LOAD

HIGH SIDE

SWITCH

6

5

DC or AC

BUS V+

FIGURE 5: Block Diagram and Function.

High side (5) or low side (6) switch connections are facilitated by full isolation between Input Logic, Base Plate and Output

Switch Connects.

Logic level Control input circuit drives an Opto-Coupler across the isolation to the switch circuits and a second Opto-Coupler

make up the Input isolation group.

The Output circuit consists of Output MOSFETs connected at their sources through a current sense resistor and their Drains

offered as the output switch.

In the DC version, the sense resistor is monitored by the I

detection circuit, the power supply and the control Opto-Coupler. Based on these inputs the Gates of the output MOSFETs

are controlled. The Fault Latch also provides the Status signal.

In the AC version, an absolute amplifier rectifies the output current (voltage) of the sense resistor by the I

As in the case of the DC version, a Fault Latch receives inputs from the I

Opto-Coupler. Based on these inputs the Gates of the output MOSFETs are controlled. The Fault Latch also provides the

Status signal.