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SJSU EE 136 - STABILITY AND CONTROL LOOP COMPENSATION

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EE136STABILITY AND CONTROL LOOP COMPENSATION IN SWITCH MODE POWER SUPPLYMethods of stabilizing the loopMethods of stabilizing the loopSlide 5Methods of stabilizing the loopStability testing methodsSet up the transient load testAnalysis for transient testAnalysis for transient testMeasurement procedure for the closed- loop power supply systemsMeasurement procedure for the closed- loop power supply systemsA typical Bode plotDesign exampleDesign exampleSlide 16Slide 17Slide 18Slide 19EE136STABILITY AND CONTROL LOOP COMPENSATION IN SWITCH MODE POWER SUPPLYPresent By Huyen TranSTABILITY AND CONTROL LOOP COMPENSATION IN SWITCH MODE POWER SUPPLYpotential risk for oscillation in a closed loop control system methods of stabilizing the loopMethods of stabilizing the loop • By Circuit and Mathematical Analysis-Required “fine tuning”• Interrogative Methods of Loop Stabilization-A “difference techniques” can be used to establish the required characteristics of the compensated control amplifier.Methods of stabilizing the loop Type 1 Compensation+-OUTR1C1ViVREF0Vo111CsRVVIOMethods of stabilizing the loop •Type 2 Compensation +-.R1C1ViVREF0VoR2C2 PZIOCsssCRVVH211Methods of stabilizing the loop•Type 3 Compensation+-.R1C1ViVREF0VoR2C2R3C3      2121233211331121111CCCCsRCRCCsRCRRsCsRVVFIOCStability testing methods•One of these method is transient load testing -the transfer function changes under different loading conditions.Set up the transient load testAnalysis for transient testAnalysis for transient test•For an under damped response, it will have a poor gain and phase margins and maybe only conditional stable. With this performance, the oscillation may occur. •For an over damped response, it is very stable, but does not give the best transient recovery performance.•For waveform c, it is stable transient response, and it will provide enough gain and phase margin for most application.Measurement procedure for the closed- loop power supply systemsMeasurement procedure for the closed- loop power supply systems•voltmeter V1 is used to measure the ac input of control amplifier•voltmeter V2 is used to measure the ac output voltage of power supply for each time changing the frequencyA typical Bode plotDesign example Stabilizing a Forward Converter Feedback Loop with a Type 2 Error Amplifier•V0 = 5V•I0(nom) =10A•Minimum I0 = 1A•Switching frequency = 100 kHz•Minimum out put ripple = 50mVDesign example•calculate Lo and Co onITVL003H661015101053orOVdIC61065F2600 0.05210656-And the cutoff frequency of the output LC filter Is HzCLOO80610260010152121f 66oDesign example•the frequency of the ESR zero isHzCROesr250010652121f6esrThen the modulator gain :dBVGSPm5.467.13)111(5.03)1(5.0DVTDTVTTVSPonSPonSP)1()1()1(VODesign example•Then the total open loop gain Gt = Glc + Gm +Gs is draw in fig.1Design example•At very low frequency, it is a straight line with -1.5dB and then it hit 2 poles at the frequency which is 806 Hz and start rolling down with slope of -40dB/dec until it hit a zero at 2500 Hz, and the line still rolling down but the slope only -20dB/dec.Design exampleU 1O P A M P+-O U TR 11 kR 21 0 0 kC 13 1 8 p0V 11 V a c0 V d cC 32 0 pfz = 5kHz, fp =80 kHz, gain


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