SECTION 5
5.1 Introduction
5.2
THEORY OF OPERATION
This section describes the internal operation of the DCS (3kW) Series power supply.
Section 5.2 Basic Functional Blocks
provides an explanation of the main functions within
each functional block of the supply.
Section 5.3 Detailed Circuit Descriptions
in-depth descriptions of the supply's circuitry, including remote programming and monitoring
circuits not covered in Section 5.2.
are intended as a reference for when you are configuring
new applications or for when you are troubleshooting. They assume that you are familiar with
the operation of logic gates and with the functioning of active and passive components such as
op amps, transistors, resistors, capacitors, diodes, transformers, and inductors.
Basic Functional Blocks
The DCS (3kW) Series supply is a single isolated output, switch mode power supply which
utilizes a 30 kHz pulse width-modulated, full bridge converter. The supply is composed of
seven (7) main functional blocks:
1. AC Input and RFI Filter (A5 PCB)
2. AC Input Rectifier and Inrush Limiting Circuit (A6 PCB)
3. PWM (Pulse Width Modulator), Sync Circuit, Power Transformer Drive Circuit, and
Power Transistor Bridge (A3 PCB)
4. Power Transformer, Output Rectifiers, Output Inductor, Output Filter Capacitors, and
Sense Connections (Power Stage Assembly, A7 PCB, and A8 PCB)
5. Output Current Shunt, Shunt Amplifier, and Down Programmer Circuits (A4 PCB)
6. Control, Programming, OVP, Shutdown, Monitoring, and Auxiliary Supply Circuits
(A2 PCB)
7. Front Panel Displays and Local Controls (A1 PCB)
Operation Manual
5-1
