CB3LP chip temperature control system.

<P> CB3LP Introduction and internal block diagram of the chip </ P> <P> CB3LP chip pan in Beijing Intelligent Control Technology Co., Ltd. based on analysis of proprietary research "intuitive intelligent control technology" (Sensorial Intelligence Control, referred to as "SIC" .), and developed a chip products. .The product is difficult to control the controlled object to improve the control performance of automatic closed-loop platform technology, enabling engineers to easily and fast to design a variety of all intelligent fuzzy controller. .</ P> <P> CB3LP with the nature of anti-interference ability, any structure of the fuzzy controller with microcontroller can not match. .For the time-varying parameters, time-varying large delay difficult to control the controlled object, CB3LP control of fluctuation is less than 0.2%; for easy to control the controlled object, CB3LP control of fluctuation is less than 0.1 ‰. .CB3LP external capacitor and two diodes and a circuit configuration within the intelligent integration operation, to achieve control of static error; online automatically adjust (the implementation of embedded microcontroller) or off-line manual adjustments CB3LP external resistor, the dynamic performance of the control response optimization; CB3LP Activity .static control quality better than the fuzzy control; online (or offline) to adjust the control performance is simple; anti-interference ability. .Because there are so many obvious technical advantages, the wide range of applications, commonly used in high-precision control of time-varying parameters, time-varying large delay and other difficult to control object; PID controller can be replaced easily controlled high-precision control of the controlled object. .</ P> <P sizset="0" sizcache="3"> CB3LP is a function of fuzzy control chip that integrates a function of the fuzzy reasoning, intelligent control function that is intuitive, a <NOBR id = nobr61 style = "CURSOR .: pointer; COLOR: # cb4bfc; BORDER-BOTTOM: rgb (102,0,255) 1px dotted; BACKGROUND-COLOR: transparent; TEXT-DECORATION: underline "jQuery1276083640671 =" 52 "> operator <NOBR id = nobr74 style =" CURSOR: .pointer; COLOR: # cb4bfc; BORDER-BOTTOM: rgb (102,0,255) 1px dotted; BACKGROUND-COLOR: transparent; TEXT-DECORATION: underline "jQuery1276083640671 =" 53 "> amp </ NOBR> </ NOBR> and a PWM .generator used to construct the intelligent controller. .CB3LP control of a given input and feedback inputs are <NOBR id = nobr93 style = "CURSOR: pointer; COLOR: # cb4bfc; BORDER-BOTTOM: rgb (102,0,255) 1px dotted; BACKGROUND-COLOR: transparent; TEXT-DECORATION .: underline "jQuery1276083640671 =" 54 "> Analog </ NOBR> voltage signal; control output is divided into two analog and PWM outputs, customer choice; by changing the external circuit devices can be added to dual-mode control and intelligent integration operations. .The pin functions shown in Figure 1. .</ P> <P align=center> </ P> <P align=center> internal block diagram of Figure 1 CB3LP </ P> <P> CB3LP fluorescence quantitative PCR chip temperature control system design ideas </ P> .<P> fluorescence quantitative PCR system consists of the basic PCR, fluorescence detection, and host computer components. .PCR is a basic foundation of this instrument, including the semiconductor chip cooling, temperature collection and treatment, etc, must have precise temperature control, rapid heating and cooling, the temperature uniform PCR instrument such as the basic requirements to ensure the smooth completion of PCR process. .Fluorescence excitation light source section includes, photomultiplier tubes, signal acquisition and processing section. .PC parts including data collection and system analysis software, is mainly responsible from under the crew collecting data, the formation of real-time graphics and data processing and graphical analysis, the target DNA fragment content, and other test reports and information; same time, the host computer in ., according to the samples of the PCR reaction conditions, set the corresponding temperature parameters, time and temperature cycles, etc., then the system into the fast heat up, constant temperature, rapid cooling, temperature and other PCR cycle, until all of the loop ends. .</ P> <P sizset="3" sizcache="3"> Figure 2 shows CB3LP chip temperature control system block diagram. .PC via the serial port to issue a given temperature signal to the microcontroller, the <NOBR id = nobr67 style = "CURSOR: pointer; COLOR: # cb4bfc; BORDER-BOTTOM: rgb (102,0,255) 1px dotted; BACKGROUND-COLOR: transparent; TEXT .-DECORATION: underline "jQuery1276083640671 =" 55 "> DAC </ NOBR> chip (AD667) into analog signals, amplified by the LM358 dual op amp, the added CB3LP chip control for a given input; same time, the temperature measurement bridge .PT100 platinum resistance will be weak into a voltage signal, after three and two-stage amplifier INA118 amplified single op amp 3140, two routes out, all the way to CB3LP chips, another way to <NOBR id = nobr65 style = "CURSOR: pointer .; COLOR: # cb4bfc; BORDER-BOTTOM: rgb (102,0,255) 1px dotted; BACKGROUND-COLOR: transparent; TEXT-DECORATION: underline "jQuery1276083640671 =" 56 "> ADC </ NOBR> chip AD574, converted into digital signals .sent to the microcontroller and set the temperature compared to control microcontroller output heating, cooling control signal. .Finally, the chip through the output coupler and CB3LP PID control signal mixed PID regulator output has good heating and cooling control signal to the semiconductor chip's power supply for the cooling circuit, cooling film accurate temperature control heating and cooling. .</ P> <P align=center> </ P> <P align=center> Figure 2 CB3LP chip temperature control system block diagram </ P> <P> CB3LP chip temperature control system in the design of specific applications .</ P> <P> 1. thermometry bridge and signal amplifier </ P> <P sizset="5" sizcache="3"> temperature bridge and signal amplifier circuit shown in Figure 3, the R5 ., R7, R8, R9, PT1 platinum resistor temperature bridge, will be weak PT100 platinum resistance into a voltage signal. .PT100 at 0 ℃, when the resistance is 100Ω, then the temperature is increased by one degree increase in resistance 0.385Ω. .Condition at 0 ℃, the PT1 resistance is 100Ω, adjust R9, so that the bridge B, D equal potential at both ends, when the bridge is balanced. .When the outside temperature changes, <NOBR id = nobr77 style = "CURSOR: pointer; COLOR: # cb4bfc; BORDER-BOTTOM: rgb (102,0,255) 1px dotted; BACKGROUND-COLOR: transparent; TEXT-DECORATION: underline" jQuery1276083640671 = ."57"> sensor </ NOBR> PT100 resistance there will be corresponding changes, B, D potential are no longer equal at both ends, when the bridge is in non-equilibrium state. .B, D between the load resistor R10, R11, the output voltage VBD. .If the R5, R7 and R8 remain unchanged, then changes VBD PT1 will change. .</ P> <P sizset="6" sizcache="3"> VBD accordance with the function of PT1, by detecting the unbalanced bridge voltage VBD, to reflect the bridge arm resistance PT1 small changes, this non-equilibrium .the basic principles of bridge work. .To make temperature more accurately, do not use external power supply +5 V power supply, but the use of the <NOBR id = nobr144 style = "CURSOR: pointer; COLOR: # cb4bfc; BORDER-BOTTOM: rgb (102,0,255) 1px dotted .; BACKGROUND-COLOR: transparent; TEXT-DECORATION: underline "jQuery1276083640671 =" 58 "> Voltage Regulator </ NOBR> TL431, the VOUT = (1 + R3/R4) · Vref = 2 × 2.5V = 5V. .</ P> <P align=center> </ P> <P align=center> Figure 3 Temperature bridge and signal amplifier </ P> <P> by a PT100 platinum resistance into a voltage signal was weak, the .three op amp IC INA118 about 10 times magnification. .INA118 Internal block diagram shown in Figure 4. .Magnification G = 1 +50 kΩ/R12 = 1 +50 / 5.1 = 10.8. .After three op amp voltage signal and then amplified by two 3140 single-chip op amp amplifier amplify the same name added to CB3LP input 1 foot, but also added to the AD converter chip U11 (AD574) 13 feet, converted into digital signals .gave microcontroller 89C52, and set the temperature compared to control SCM P13, P14 output heating, cooling control signal. .<P> </ P> <P align=center> </ P> <P align=center> Figure 4 INA118 Internal Block Diagram </ P> <P> PT100 platinum resistance sensors, the platinum resistance temperature by small voltage .measure is vulnerable to interference, and the platinum resistance is very small, easily broken along the bad, so be careful when installing, and as far away from sources of interference. .Signal amplification circuit using operational amplifiers, op amp to carefully adjust the zero resistance, the op amp zero. .</ P>.