Analysis of 320X240 uncooled microbolometer focal plane array ...

48The controller configuration was first used as a linear power supply TEC controller atInframetrics. With the use of the root locus plots and the circuit response simulation,modification was made to the resistor and the capacitor values of the controller circuit tooptimize it for the TEC pump model and the switching power supply circuit.The first three op-amps represent the controller, and the dependent voltage sourcein the circuit is placed after the controller to drive, in the place of switching powersupply, the TEC pump model circuit. The pulse source is placed in the feedback path tosimulate the TEC temperature fluctuation, and the pulse is fed to the negative terminal ofthe differential amplifier. The reference voltage is fed to the positive terminal.Root locus of the circuit was plotted to predict stability and response of the circuitusing Matlab. The following equations are the open loop transfer function of the eachamplifier stage of the controller. H 1(s), H2(s), and H3(s) refer to the differential amplifierstage, the second amplifier stage, and the third amplifier stage transfer functions,rrxcru.•ti ,tirxl-tx T1i rUfft.rartfial amplifier ninly Ilae a TIC train