Signal Consulting, LLC  Model Si24DiTEPTC1-12BSD-50V-20A

12-Bit, Digital, Thermo-Electric (TE), Proportional, Temperature Controller with Integrated Heat Sink, with 4-Pin RS232 Serial LCD Port, and with PWM, Y-Chip

Si24DiTEPTC1-12BSD-50V-20A Features: Fully Programmed Proportional Temperature Controller Efficient H-Bridge for Bidirectional Current Control 12-Bit Temperature Control with 0.0650C Steps, in the  -250C to +1020C Range Digital Set-Temperature Adjust with Up and Down Keys with 0.06250C Steps Digital Thermometer with 1/20C Accuracy and with 0.06250C Resolution   12-Bit Proportional Temperature Control:  Four User Selectable Proportional Temperature Control Grids G0,..,G3 are Used: Grid G0 is used for small thermal loads and G3 is used for large loads. Each control grid uses sixteen non-uniformly spaced temperature levels with eight PWM duty-cycle values. The temperature overshoots and oscillations (“hunting”) are limited to approximately + or - 0. 50 C. The grid selection is defined by Table 1, given below.      RS232 LCD Port: For Set and Measured Temperature Display Alarm Kill Switch: A normally open switch (or an Open Collector npn Transistor) can be connected to jumper J1 (as shown below), J1 Open=Normal operation, J1 Short=Load (TE Cell) is open. The active pin on J1 is pulled to +5V through a 4.7k Ohm resistor, while the other pin (G) is at ground. With AP1 Aluminum Plate as  Heat Sink 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 Relays On Board: Filter Capacitors VTS diodes Bicolor LED Indicator,  (Red=Hot, Green=Cold) Voltage Requirement: A single DC Source Voltage (unregulated ) with any voltage value from 9V to 50V (for Vp)   Si24DiTEPTC1-12BSD-50V-20A-5Y1, Spec Sheet  (PDF)

The Si24DiTEPTC1-12BSD-50V-20A is a 50V 20A, microprocessor based, closed-loop, Digital, Thermo-Electric, Proportional Temperature Controller board that heats or cools a thermal-zone. The temperature is measured with a 12-bit digital sensor and proportionally controlled with 0.0625⁰C steps in the -25⁰C to +102⁰C range.  An efficient high-power H-bridge controls the current (in the 0 to +/- 20A range) to Peltier type Thermo-Electric (TE) cells, functioning as a bidirectional heat-pump. By proportional control, we mean that the amount of correction used in the closed-loop is proportional to the difference between the set and measured temperature values. Four user selectable proportional control grids G0,..,G3 are used to control a wide range of thermal loads. Grid G0 is used for small loads (typically: 10cm x 10cm x 10cm Aluminum block), and G3 is for large thermal loads. The grid selection is defined by Table 1, given below. Each control grid consists of sixteen non-uniformly spaced temperature levels (centered at the set-temperature value) with eight PWM duty-cycle values are used to control the temperature in 0.0625⁰ C steps. The temperature overshoots and oscillations (“hunting”) are limited to approximately + or - 0. 5⁰C. The temperature is sampled at approximately 1Hz rate and the control-loop/display is updated with the same rate.  An onboard microprocessor measures and controls the temperature; monitors the user inputs; and drives a 2 line x 16 character LCD. A small 12-bit digital thermometer, Signal’s part number Si24DTsens-12B  (connected to port CN3 and uses the Dallas Semi., DS18B20 sensor) is used to measure and control the temperature in the -25⁰C to +102⁰C range, with ½⁰ C accuracy. 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. As the name digital (Di) implies the desired set-temperature is adjusted with the Si24PB2-MC3 Up and Down push-buttons in 0.0625⁰ 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 order Signal under the part number of Si14LCD2L16CH  (2-Line by 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 50V 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 applications.

Grid Selection, Table 1

Note that each jumper defines two heating and two cooling ranges centered at the Set Temperature. Heating and Cooling Pulse Width Modulation (PWM) starts when the measured temperature is within this user selected range; otherwise the PWM is 100%. This table controls the amount of power is applied to the TE cell as the measured temperature approaches the Set Temperature. Note this table is not uniform; because the TE cells are more efficient in heating mode than in cooling mode. The user can control temperature overshoots and oscillations (“hunting”) by choosing the proper Grid Number for his application.

2-Line by 16-Character LCD Display Format:

An optional 2-Line by 16-Character serial LCD (Si14LCD2L16CH-4SP) can be connected to port CN2.

This +5V, RS232 serial LCD operate at 9600 Baud rate with: 1 Start-Bit, 8 Data-Bits, 1 Stop-Bit, No Parity-Bit.  A typical LCD display is given below:

 Line 1:    ST=+025.00 C  Pxy    

Line 2:    MT=+025.00 C Bzz

 Where:  ST=Set-Temperature, Pxy, where x=PWM value in use, x=0=0%, x=1=12.5%, x=2=25.0%,… x=7=100%, and y=Grid value in use, y=0=Grid 0, … y=3=Grid 3.

A Typical Application of the Si24DiTEPTC1-12BSD-50V-20A

In this 12-bit, closed-loop, proportional temperature control application, the Set-Temperature (in the, -25⁰C to +102⁰C Range with 0.0625⁰C steps) is adjusted with the Si24PB2-MC3 UP and Down push-buttons, connected to port CN6. The Peltier type Thermo-Electric (TE) cell is functioning as a bidirectional heat-pump; operating with 12VDC (unregulated) at 20A max. The TE cells can be purchased from: www.customthermoelectric.com/.  The temperature of the enclosed and insolated Hot/Cold Environment is measured with the Dallas Semi. DS18B20 (in TO-92 casing) Digital Thermometer, Si24DTsens-Spec1-DS18B20.This sensor can be purchased from Signal Consulting, LLC as Si24DTsens-12B (DS18B20 with 12” leads and connector). The LCD module can be ordered from Signal with the part number of Si14LCD2L16CH-4SP  (2x16 display with 12” cable and 4-pin connectors, and with back-light). A wide variety of Linear and Switching Type of Power Supplies can be purchased from: http://www.mpja.com/powersupply.asp.

Warning:  The connecting wires to the Load and the Power Supply must be heavy gage copper wire (#12 AWG or heavier) to handle the rated current level. In addition, these heavy gage wires act as a heat sink, protecting the board from overheating.

Availability: We usually ship in 2-3 business days.

All Products Are Proudly Made in the USA