Field Configurable, Bidirectional, Thermo-Electric (TE), Proportional-Integral
(PI), Temperature Controller with RS232 LCD Port, Centigrade or Fahrenheit
Display Scales and with Analog or Digital Control Inputs for
Heating or Cooling Applications
Analog and Digital Control Ports:
User can select between analog
(Potentiometer) or Digital (Up/Down Keys) Control Inputs.
PI Temperature Control:
Proportional and Integral (PI) Temperature Controller
in the -500C to +1200C Range with 0.0650C steps
on 1 Load.
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 Optional RS232 LCD Port:
For Set and Measured Temperature Display.
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):
9V to 26V DC, unregulated DC voltage.
98.5% typical, at 26V and 16A
Max Load Power: 416W at 26V, 16A.
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)
Si23BdTEPITC1-12BSD-26V-16A is a 26V 16A,
microprocessor based, closed-loop, Field-Configurable, Bidirectional,
Thermo-Electric, Proportional-Integral (PI) Temperature Controller board
that heats and cools a thermal-zone (lead reversal on TE cell is NOT required).
An efficient high-power H-bridge controls the current (in the 0 to +/- 16A
range) to a Peltier type Thermo-Electric (TE) cell (or a bank of cells,
connected in parallel), functioning as a bidirectional heat-pump. By 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). 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
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.
The jumper J3 is used
to select the Configuration Mode (J3 Open) or the Running Mode
(J3 Short). In the Configuration Mode, a set of control-parameters are
selected (or the Board is Configured); and in the Running Mode, the
configured parameters are executed. In the Analog Configuration, 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 Configuration,
the desired set-temperature is adjusted with the
Up/Down Keys (two
Normally-Open Push Buttons, connected to Port CN4) 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
16-Char display with 12” cable and 4-pin connectors, and with back-light). 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 (9V to 26V
range). A small Aluminum Plate (3.3”x4.0”x0.065”) is required to operate at 416W
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
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
(connected to port CN4). The Peltier type Thermo-Electric (TE) cell is
functioning as a bidirectional heat-pump; operating with 24VDC (unregulated) at
20A max. The temperature of the enclosed and insolated Hot/Cold Environment is
measured with the
Si24DTsens-12B Digital Sensor (Si24DTsens-Spec1-DS18B20)
with 12” leads and connector. The LCD module can be ordered from Signal with
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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BUY these Accessories
Si23BdTEPITC1-12BSD-26V-16A, it is recommended to buy one
Digital Thermometer, one
2 Line by
16 Character Serial LCD with
12" long cable and 4-pin Connector, one
with 12" leads.
Up and Down Push-Buttons with 12" lead and connector.
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.
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