ILX Lightwave LDC-3700 Series User Manual

This chapter explains the general function of each board and each circuit in the block diagram. The TEC theory of
operation is explained in Section
5.2, the LASER side is explained in Section 5.3, and the theory,of operation of
the Main Processor board, which is common to both TEC and LASER operation, is explained in Section
5.4. The
Front Panel Display and Switch Boards are discussed in Section
5.5, while the Power Supply Board is discussed in
Section
5.6.
5.2 TEC Board Theory of Operation
The
TEC Board is mounted on its side, directly behind the TEC display section of the front panel. Figure 5.2
shows the functionality of the TEC Board. The following sections detail the theory of operation for each of the
blocks in Fipre
3.2.
OPTICALLY ISOLATED SERIAL BUS
(TO MICROPROCESSOR BOARD)
DIGITAL-ANALOG
LIMIT SET POINT
INTERFACE
L- , I
SET TEMPERATURE
ACTUAL TEMPERATURE
\I
A/ D
CONVERTER
DIFFERENTIAL
AMP
SENSOR
PROPORTIONAL
-Dl,
4w INTEGRAL
BIPOLAR
OUTPUT
STAGE
ITE MEASUREMENT
I
Figure 5.2 TEC Board Block Diagram
5.2.1 TEC Digital-Analog Interface
The TEC interface provides optically isolated serial communications between the TEC board and the
n~icroprocessor. Control signals are passed to the TEC board to set the TEC board status, current limit, and
temperature
set points. Instructions and data are sent over the serial interface to the optical barrier, U207 - U213
(see Figure 7 19). Status and analog TEC control data are serially passed back to the microprocessor via U206 and
U207.
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ILX Lightwave LDC-3700 Series Specifications

General

Brand	ILX Lightwave
Model	LDC-3700 Series
Category	Controller
Language	English