Signal Consulting, LLC  Model Si14HyUdPTC1-50V-20A

Hybrid, Unidirectional, Proportional, Temperature Controller with LCD Port and with 9-Bit Digital Temperature Sensor, Y-Chip

Si14HyUdPTC1-50V-20A Features: Power Semiconductors: Two 60A MOSFET Max. Continuous Current: 20A with Heat Sink (as Shown) Max. Current for 5sec: 40A with Heat Sink (as Shown) Overall Dimensions: 61mm x 57mm x 44mm Integrated Finned Heat Sink with 4-40 Standoffs and Screws Component Type: 100% Solid State,   RoHS Compliant   Closed-Loop Temperature Control in 1/20C Steps, -250C to +1020C Range   Factory Calibrated 9-Bit Digital Temperature Sensor is Immune to Additive Noise   LCD Port for Set and Measured Temperature Display   High Power-Efficiency: 98.0% typical, at 50V and 20A  On Board: Filter Capacitors VTS diodes Snubber Circuit Ready Load-Voltage Indicator, LED (red) Voltage Requirement: A single DC Source Voltage (unregulated and Unfiltered) with any voltage value from 9V to 50V (for Vp)    Si14HyUdPTC1-50V-20A-1Y Spec Sheet  (PDF)

The Si14HyUdPTC1-50V-20A is a microprocessor based, Hybrid, Unidirectional, Proportional Temperature Controller board that uses pulse-width modulation (PWM) to efficiently control average power to a resistive heater or Thermo-Electric (TE) cooler cell in the 0 to 1000W power range. An onboard microprocessor controls the load-power, monitors the sensor input and drives the LCD port. The temperature is sampled at 1Hz rate and it is measured with a small, 9-bit digital thermometer ( Si18DTsens). This sensor uses a unique “1-wire interface” (with parasite power mode) that requires only 2-conductors for reliable remote (long as 20 meters) temperature sensing. The term proportional controller implies that the value of the average load current used is proportional to the difference between the actual and desired temperature. Five PWM duty-cycle values are used depending on the absolute-value of the difference between the set and measured temperature values (|Td|). The duty-cycle is 0% when |Td|=0⁰C; 25% when 0⁰C< |Td|<0.5⁰C; 50% when 0.5⁰C< |Td|<1⁰C; 75% when 1⁰C< |Td|<1.5⁰C; 100% when |Td|>1.5⁰C. This method allows a even temperature control in the -25⁰C to +102⁰C Range, with 1/2⁰C accuracy. The desired temperature value (or load current) is set by an external analog voltage (0 to 5V range) or by an external potentiometer.  As the name hybrid (Hy) implies, the required temperature value (or load current) is derived from a variable analog-voltage (V_I1,G), while all other control-signals are digital. This analog (V_I1,G) input is zener-diode protected and includes an integrator with time-constant of 10mSec. This board requires a single 9V to 50V DC unregulated power source at a 0A to 20A current range to operate normally. An onboard LED (red) is used to monitor the load-voltage. A small Finned Heat Sink (2.4”x2.3”x0.9”, included with the unit) is required to operate at 20A current level (or at 1000W power levels). Higher current levels (30A) or 1500W power-levels can be achieved with more efficient heat-sinks. Please click on this link and read the Board Mounting Instructions and Heat Sink Selection Guide. Typical applications are: DC Resistive Heater Controller, Thermo-Electric Cooler Controller, etc. This board can be configured and programmed to perform efficiently in many customized applications.

 A Typical Application of the Si14HyUdPTC1-50V-20A

In this heating application, the temperature (load- current) is proportionally controlled (in the 0 to 1000W power range) by the Si14 board and the desired temperature (or load current) is linearly adjusted by the Si5Pot1-5k external 1-turn 5k pot -25⁰C to +102⁰C Range, in 1/2⁰C Steps. The 9-bit digital temperature sensor can be purchased from us (see Si18DTsens) or you can wire up your own using the Dallas Semi. www.dalsemi.com Digital Thermometer chip DS18S20, in TO-92 casing (order from www.digikey.com as part number DS18S20-ND). A 2 line by 16 characters LCD (with 5V, 9600bps, RS232 Interface Standard) is used for Set-Temperature and Measured-Temperature data display. The LCD with back-light (with12” cable) can be ordered from Signal with part number of Si14LCD2L16CH-3PC. The TE cells can be purchased from:   www.customthermoelectric.com/ .  A wide variety of Linear and Switching Type of Power Supplies can be purchased from: http://www.mpja.com/powersupply.asp.

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

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