IC3600EPSA1B1B - Voltage Regulator Board

SPECIFICATIONS

Part No: IC3600EPSA1B1B
Manufacturer: General Electric
Function: Voltage Regulator Board
Series: Mark I and II
Voltage regulation: 100V.
Input voltage range: 105V – 250V DC.
Current limit: 13A, automatic shutdown above limit
Availability: In Stock
Country of Manufacturer: United States (USA)

Functional Description

IC3600EPSA1B1B is a Voltage Regulator Board developed by GE. It is a part of the Mark I and II control system. This voltage regulator board is designed to operate from any DC input voltage ranging between 105V and 250V. It regulates the output to a preset value of 100V ±15%, provided the input source voltage exceeds the regulated output voltage.

Operational Features

The system offers 1% voltage regulation accuracy and typically maintains ripple under 200 mV, making it suitable for sensitive turbine control applications. The board provides a 350 mA (or higher) drive current to the output power transistors as long as:

• The feedback voltage is below the 100V setpoint.
• The output current (monitored via a current shunt) remains under the preset limit of 13A.

When the output voltage reaches its upper limit (100V), the system:

• Ceases drive to the output transistor.
• Applies a 100 mA reverse drive to ensure fast transistor switch-off.

Once the voltage drops just 10 mV below the upper limit, the system re-engages the output (350 mA drive) if the current remains below 13A. If the output current exceeds the preset 13A limit, the board opens the output switch, keeping it open until current drops to two-thirds (≈8.7A) of the limit. Both overvoltage and overcurrent conditions independently trigger a shutdown of the output switch.

Isolation and Protection

One of the key design features of the board is the electrical isolation of:

• Output drive.
• Current limit sensing.
• Voltage regulation.

These components are AC and DC isolated from the output and voltage regulator commons, using transformer coupling to maintain signal integrity and system safety.

Circuit Components and Internal Operation

Internally, the board incorporates a free-running multivibrator formed using a pair of micro logic gates (D30), operating at approximately 100 kHz. This signal is passed through a flip-flop circuit (D45), which divides the frequency by two to produce a 50 kHz symmetrical drive signal delivered to the signal-isolating transformer (T1).

The regulation circuitry includes:

• A precision resistor divider chain (R36, R47, R48).
• A 6.2V reference Zener diode (CR22).
• A sync switch comparator (IC3) with ~10 mV hysteresis.
• An output amplifier (Q3).

The comparator evaluates the voltage from potentiometer R62 against the Zener reference. When the sensed voltage exceeds the reference threshold, Q3 is activated, cutting off drive to power transistors Q1 and Q2. The transformer T1 stops supplying AC, causing the full-wave rectifier and filter network (CR8, CR9, R15, C5) to drop output voltage to near zero, which in turn deactivates transistors Q8, Q5, and Q6, effectively halting the drive to the output.

WOC is happy to assist you with any of your GE requirements. Please contact us by phone or email for pricing and availability on any parts and repairs.

FREQUENTLY ASKED QUESTIONS

What is IC3600EPSA1B1B?
It is a Voltage Regulator Board developed by GE.

What is the operating input voltage range?
The board operates from a DC voltage source between 105V and 250V.

What is the maximum output current the board supports?
The board is designed to regulate up to 10A, with a current limit of 13A. If the current exceeds this limit, the output is cut off until the load returns to safe levels.

How accurate is the voltage regulation?
The voltage regulation is accurate to within 1% of the set output voltage.