Field-Programmable, Thermo-Electric (TE), Proportional and Integral (PI),
12-Bit, Temperature Controller (1 Load used for
Heating and Cooling at the same time) with
Analog or Digital
Control Inputs, Centigrade or Fahrenheit LCD Port, RS232 Data-Logging Port, Integrated
Heat-Sink, 750Hz PWM
Analog and Digital
User can select between analog
(Potentiometer) or Digital (Up/Down Keys) Control Inputs.
PI Temperature Control:
Proportional and Integral (PI) Temperature Controller
in the -550C to +1250C Range with 0.0650C steps
on 1 Load. The word "Bi-directional" implies
that no wire reversal is required on the TE cell to accomplish the
heating and cooling task.
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 Set and Measured Temperature Display
or Fahrenheit scales.
An RS232 Data Port:
For Data Logging.
The PI 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#:
Si24BdTEPITC1-12BSD-30V-20A is a 30V 20A,
microprocessor based, closed-loop, Bidirectional, Thermo-Electric,
Proportional-Integral (PI) Temperature Controller board that heats and
cools a thermal-zone. An efficient high-power H-bridge controls the current (in
the 0 to +/- 20A range) to a Peltier type Thermo-Electric (TE) cell (or a bank
of cells, connected in parallel), functioning as a bidirectional heat-pump.
The word "Bi-directional" implies
that no wire reversal is required on the TE cell to accomplish the heating and
PI control, we mean that the amount of correction used in the
control-loop is proportional to the difference and the Integral of the
difference between the set and measured temperature values.
In a properly tuned PI controller, the temperature overshoots and oscillations
(“hunting”) are limited to approximately + or - 0. 50C.
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. An
onboard microprocessor measures and controls the temperature; monitors the user
inputs; and drives a 2 line x 16 character LCD. The temperature is sampled at
approximately 1Hz rate and the control-loop/display is updated with the same
rate. A small 12-bit digital temperature sensor, Signal’s part number
Si24DTsens-12B , (connected to port CN3) is used to measure and
control the temperature in the -500C to +1250C range, with
10 C accuracy and with 0.0650 C precision. Because this
sensor is digital, it is virtually immune to noise and loading; ideally suited
for remote sensing. This sensor uses a unique “1-wire interface” (with parasite
power mode) that requires only 2-conductors for reliable remote (typical length
of 20 meters) temperature sensing. In the Analog Mode (ModePar=2
or 3), the desired set-temperature is linearly adjusted (in
the -250C=0V to +1020C=+5V range, with ½0
C=19.68mV steps) with the
(connected to pin I1 of Port CN6). In the Digital Mode (ModePar=0
or 1), the desired set-temperature is adjusted with the
Up/Down Keys (two
Normally-Open Push Buttons, connected to Port k0) in the -500C
to +1250C range, with 0.0650 C steps. An LCD port (with
9600 Baud RS232 Interface Standard) is provided for display of the Set and
Measured temperature data. The LCD can be ordered from Signal under part number
Si14LCD2L16CH-4PC (2-Line by 16-Char display with 12” cable and 4-pin
connectors, and with back-light). In addition, a Full-Duplex, 9600 Baud, RS232
Data-Logging Port (on CN5) is also provided. A bicolor LED is used to monitor the TE cell
(or load) voltage (Red = Heat, Green = Cold). This board operates with a single
unregulated voltage source (8V to 30V range). A small Aluminum Plate
(3.3”x4.0”x0.065”) is required to operate at 1000W power level. Higher
power-levels can be achieved with more efficient heat-sinks. Typical
applications are: Peltier Effect TE Coolers, Heat Pumps, etc. This board can be
configured and programmed to perform efficiently in many customized
A Typical Application of the
In this 12-bit, closed-loop,
PI temperature control application, and in the Analog Mode, the Set-Temperature
is linearly adjusted with the
(connected to port CN6). In the Digital Mode, the Set-Temperature is
adjusted with the
(on port k0). The Set and Measured ASCII values are presented on the
Data-Logging pin CN5-Tx (connected to a PC using the
when prompted by one ASCII character on pin CN5-Rx.
The Peltier type
Thermo-Electric (TE) cell is functioning as a bidirectional heat-pump; operating
with any 20A unregulated DC power supply. The TE cells can be purchased from:
www.customthermoelectric.com/. The temperature of the thermal
zone is measured with the
Si24DTsens-12B Digital Sensor (Si24DTsens-Spec1-DS18B20)
with 12” leads and connector. The optional LCD can be ordered from Signal as
Si14LCD2L16CH-4PC (2x16 display with 12” cable and 4-pin connectors,
and with back-light). A wide variety of Linear and Switching-Type Power Supplies
can be purchased from:
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
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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