Bi-directional, Thermo-Electric (TE), Temperature-Range Controller with
Plate Heat Sink,
Serial LCD Port, and with an RS232 Data-Logging/Programming Port
Bi-directional Temperature- Range Controller
in the -550C to +1250C Range with 0.0650C steps.
The word "Bi-directional" implies that no wire
reversal is required on the TE cell to accomplish the heating and
Efficient H-Bridge with PWM: 750Hz Pulse-Width Modulation (PWM) is used to perform
the heating and
cooling function (at the same time) on a Peltier type (TE) cell,
functioning as a bidirectional heat-pump.
One Digital Temperature Sensor:
Digital Temperature Sensor with 0.06250C
and 1/20C Accuracy
-100C to +800C Range, and approx.
-550C to +1250C Range.
Temperature Sampling Rate:
The temperature is sampled at approximately 1Hz rate and the
control-loop/display is updated with this same rate.
An LCD Port:
For Parameter and for Measured-Temperature Display
An RS232 Data Port:
For Programming and for Data Logging.
The control parameters can be changed with Up, Down, Next Keys or with
the RS232 Data Port.
Switch on J1:
open switch (or an Open Collector npn Transistor) can be connected
to jumper port J1 (as shown below), J1 Open=Normal operation, J1
Short=Load (TE Cell) is open.
VP (from pin +P to pin - P):
8V to 30V DC, unregulated DC voltage.
98.5% typical, at 30V and 20A
Max Load Power: 600W at 30V, 20A.
Max Operating Temperature:
with the Integrated
Aluminum Plate Heat Sink Heat Sink, as shown.
Power Semiconductors: Four 90A Hex-MOSFETs
Overall Dimensions: 4.0" x 3.3" x 1.4" (102 x
84 x 34mm).
Components Type: 100% Solid State, NO
Isolated Control Signals
Filter Capacitors, Voltage Transient Suppression (VTS)
Bicolor LED Indicator, (Red=Hot, Green=Cold)
board is protected by a fast-acting 20A Mini Fuse (DigiKey Part#:
is a 30V, 20A,
microprocessor based, Field Programmable, Bi-directional, Thermo-Electric,
Temperature-Range Controller that heats or cools a thermal-zone (using an
H-bridge and one Thermo-Electric (TE) cell) whenever the measured temperature (MT)
is outside of the user-selectable temperature Limit Ranges (L,
l, h, H). An efficient onboard
high-power H-bridge controls the current (in the 0 to +/- 20A range) to a
Peltier type Thermo-Electric (TE) cell, functioning as a bi-directional
The word "Bi-directional" implies
that no wire
reversal is required on the TE cell to accomplish the heating and cooling task.
temperature is measured with a 12-bit digital sensor and controlled with 0.06250C
steps in the -550C to +1250C range. This controller
has two operating modes: Program-Mode and Run-Mode. In the “Program-Mode”
with Jumper J2 pins open circuited (J2=Open), seven control
parameters are interactively selected and saved in nonvolatile memory. In the
“Run–Mode”, with Jumper J2 pins short circuited (J2=Short),
the board functions as a Bi-directional Temperature-Range Controller as directed
by the seven programmed parameters. The control action is defined on Figure1.
Note that there are 4 Field Programmable Temperature
Limit Values (L, l, h, H) used to control the heating/cooling action of
the thermo-electric (TE) cell. The control action includes a low-side (L
to l) region and a high-side (h to H) region. These are
Hysteresis regions, preventing excessive temperature-control chatter. An
LCD port (with 9600 Baud RS232 Interface Standard) is provided to display the
Temperature-Limit values and the Measured Temperature data. In addition, a
Full-Duplex, 9600 Baud, RS232 Data Port (on CN5) is also provided, used
in both operating modes.
Control Action of
Application Drawing of the
In this 12-bit,
temperature-range control application (diagram shown below), this controller
heats or cools a thermal-zone (using one Thermo-Electric (TE) cell) whenever the
measured temperature (MT) is outside of a user-selectable temperature Limit
Range (specified by L,.. H). The Peltier type Thermo-Electric (TE) cell
is functioning as a bi-directional heat-pump. It can be purchased from:
www.customthermoelectric.com/. The temperature of the enclosed
and insolated Hot/Cold Environment is measured with the Dallas Semi. DS18B20
Digital Thermometer (in TO-92 casing). This sensor can be purchased from Signal
Consulting, LLC as
Si24DTsens-12B (DS18B20 with 12” leads and connector). The optional
LCD module can be ordered from Signal using the part number of
Si14LCD2L16CH-4PC (2-Line by16-Character display with 16” cable and
4-pin connectors, and with back-light). A wide variety of unregulated linear and
switching power supplies can also be used with this controller. Consult the most
recent catalog on
www.mpja.com to purchase these power supplies.
Warning: The connecting wires to the Load and the Power
Supply must be heavy gauge copper wire (#12 AWG or heavier) to handle the rated
current level. In addition, these heavy gauge wires act as a heat sink,
protecting the board from overheating.
can be operated in different applications. You need to order
different accessories depending on your application. The
Digital Thermometer is always required but the other
accessories are optional. In each of the applications, the
board can be programmed; and the current data can be displayed or
PC Application: The
board is connected to a 9600 Baud full-duplex ASCII controller
(typically a PC or laptop computer, using a HyperTerminal or Putty
type program); you only need to order the
Si24DB9cable-3FM RS232 cable.
board is connected to the
16-Character Serial LCD) and programmed with the
board is connected to the
that includes a 2-line by 16-character, transflective, serial
with back lighting,
a 5k Ohm 10 Turn Potentiometer and 3-push buttons (Up, Down and
Next) mounted on a 3 by 4 inch PCB board.
Si24DTsens-12B 12-bit Digital Thermometer (
-550C to +1250C Range, in 0.0650C
Steps ) with
12" leads and 3pin Molex Connector.
2 Line by 16 Character Serial LCD with 12" long cable and 4-pin
Two Push-Buttons with 12" lead and
3-pin FM Molex Connector.
includes a 12 inch long ribbon cable with 8-pin connectors.
We usually ship in 2-3 business
All Products Are Proudly Made in the USA