Output Regulation; Theory Of Operation; Figure 2-1. Mdxii Unit Functional Block Diagram - Advanced Energy MDX II User Manual

Output Regulation

You can use the MDXII unit as a power, current, or voltage source, depending on the method
of output regulation you select using the REGULATION switch on the control panel.
Because setpoint levels are stored in nonvolatile memory, you can use them to recover from
input power interruptions and to ensure repeatability from run to run.

Theory of Operation

Figure 2-1 on page 2-5 and the following paragraphs outline the theory of operation.

Figure 2-1. MDXII unit functional block diagram

Input
In the input section, ac line voltage is applied through the circuit breaker to a three-phase
contactor. The contactor, when closed, delivers the line voltage to a rectifier bridge, where it is
converted to dc. The dc voltage is applied to bus capacitors through soft-start circuitry. This
bus provides dc voltage to the inverter section. The input section also supplies ac voltage to the
housekeeping supply.
Housekeeping Supply
The housekeeping supply section provides various low-voltage dc power levels to the inverter,
card cage, and control panel.
Inverter
The inverter section converts dc to high-frequency voltage by alternating the current through
four sets of switching transistors (see Figure 2-2 on page 2-6 and Figure 2-3 on page 2-6).
Output
In the output section, an isolation transformer steps up the high-frequency voltage from the
inverter section and sends it to a full-wave rectifier bridge. The rectified dc power then passes
out through a filter network and through the output measurement section.
5700262-R Product Overview
MDXII Power Supplies
2-5