Signal Consulting, LLC  Model Si24HyTEPTC1-12B-50V-20A

12-Bit, 50V 20A, Hybrid, Thermo-Electric, Proportional, Temperature Controller with Integrated Heat Sink, LCD Port and with PWM,Y-Chip

Si24HyTEPTC1-12B-50V-20A Features: Two User Selectable Proportional Temperature Controller Grids are used  to accommodate a wide range of Thermal Loads (G8 for small loads and G9 for large loads). Efficient H-Bridge is used for Bidirectional Current Control. 12-Bit Temperature Control in the -250C to +1020C Range with 0.0650C Steps. Set-Temperature is Adjusted with a Potentiometer in 0.50C Steps. Digital Thermometer with 1/20C Accuracy   12-Bit Proportional Temperature Control:  Each Control Grid (G8 or G9) uses Sixteen non-uniformly spaced temperature levels (centered at the set-temperature value) with eight PWM duty-cycle values to control the temperature in 0.06250 C steps. Alarm Kill Switch: A normally open switch (or an Open Collector npn Transistor) can be connected to jumper J2 (as shown below), J2 Open=Normal operation, J2 Short=Load (TE Cell) is open. The active pin on J2 is pulled to +5V through a 4.7k Ohm resistor, while the other pin (G) is at ground.    LCD Port: For Set and Measured Temperature Display High Power-Efficiency: 98.5% typical, at 50V and 20A Optically Isolated Control Signals On Board: Filter Capacitors VTS diodes Four 60A Power MOSFETs 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)   Si24HyTEPTC1-12B-50V-20A-4Y4, Spec Sheet  (PDF)

The Si24HyTEPTC1-12B-50V-20A is a 50V 20A microprocessor based, closed-loop, Hybrid, 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. Two user selectable proportional control grids G8 or G9 are used to control a wide range of thermal loads. Grid G8 is used for small loads (selected when J3 is installed) and G9 is used for large loads (selected when J3 is open). 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 20 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 Hybrid (Hy) implies, the desired set-temperature is linearly adjusted with the Si5Pot1-5k  potentiometer in the -25⁰C=0V to +102⁰C=+5V range, with ½⁰ C=19.68mV steps. An LCD port (with HITACHI HD44780 Interface Standard) is provided for display of the Set and Measured temperature data. The 2 line x 20 character LCD can be ordered from Signal under the part number of Si24LCD2L20CH  (2x20 display with 8” ribbon cable and 14-pin connector 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.

A Typical Application of the Si24HyTEPTC1-12B-50V-20A

In this 12-bit, closed-loop, proportional temperature control application, the Set-Temperature is linearly adjusted (in the -25⁰C=0V to +102⁰C=+5V range, with 0. 5⁰C=19.68mV steps) with the Si5Pot1-5k  potentiometer, 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. TE cells can be purchased from Melcor Corp. Trenton, NJ 08648 USA, WEB: www.melcor.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 Si24LCD2L20CH  (2x20 display with 8” ribbon cable and 14-pin connectors).  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.

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