What can you tell of the circuit operation and powerįlow when the inductor current changes direction? Inductor current especially the change of current direction. Simulate the buck converter using the parameters in Table 1. Compare and explain if there is any difference of critical frequency obtained between calculation and simulation. The upper switch and lower switch, and output voltage waveforms to verify the calculation in (iii). Plot and capture the PWM signal, inductor current, mid-point voltage (with respect to ground) between Use the critical frequencyfs,minfound in part ii) to simulate in LTSpice a synchronous buck converter to operate Note that the waveforms should be captured only after the circuit has reached steady-state. Table 1: Circuit and operation parameters for a buck converter.įigure 1: LTSpice simulation of a synchronous buck converter using a voltage-controlled voltage source (E1) as aįloating gate driver. Vi) Give an explanation to the need of deadtime for M1 and M2 switching actions. source of upper switch/drain of lower switch w.r. V) Capture the following waveforms from the simulation results:input voltage, input current, inductor current, Use the pulse function of a voltage source to generate the correct signals to drive the free-wheeling diode is replaced by a MOSFET as shown inġ ) in LTSpice and simulate the converter using the parameters and values in Table 1. Iv) Construct a synchronous buck converter (i. Pulsating? What would you recommend to smooth out the current if it is pulsating? Iii) Observe the waveshapes of the input current and output current of the buck converter. Use the corresponding formula, which you have derived in Section 2, to calculate the duty Ii) Construct a non-synchronous buck converter in LTSpice and simulate the converter using the parameters and I) Based on the circuit parameters and operating conditions in Table 1, can we determine if the converter operates 3 Non-synchronous and synchronous buck converters Will be experimentally verified on the breadboard during the lab sessions in the power systems lab (see Section 4 ). In thisĮxercise, you will simulate both non-synchronous buck converter and synchronous buck converter. This simulation exercise is to provide an in depth study of two different versions of the buck converter. Output load is light, i., for non-synchronous buck converter it would enter DCM operation at light load. Sketch and describe the inductor waveform of a synchronous buck converter when the Iii) A synchronous buck converter is the same buck converter structure but has replaced the free-wheeling diode Parametric relationships of those two formulas? Other semiconductor is a diode (so-called non-synchronous buck converter). This is based on the buck converter circuit with only one power transistor and the Ii) Derive the relationships between input and output voltages, i.e/Vin, for a buck converter operation at DCMĪnd CCM of operations. I) Sketch and describe briefly the inductor waveforms that make them operate in these three modes, i., DCM, Refer to the lecture videos, notes, tutorials and reference books, please do the following: The keyĬomponent in the buck converter that creates these three modes is the inductor. Mode (DCM), boundary (or critical) conduction mode (BCM) and continuous conduction mode (CCM). Similar to most power converters, buck converter can operate in three distinctive modes: discontinuous conduction Successful completion of this lab willīuild a solid foundation for the subsequent labs and group project. Uous conduction mode (CCM) and discontinuous conduction mode (DCM). We will use the DPWM to study the step-down (buck) converter in contin. The purpose of the lab section is to explore digital pulse-width modulation (DPWM) for power converters through It is well suited for integration of renewable energy systems (RES) into theĮlectricity network or even standalone RES. It facilitates complex mathematical calculations, decision making and In this assignment, we will introduce you to several aspects of the buck converter, namely, theoretical analysis,Ĭircuit simulation, power converter control and experimental investigation.ĭigital control of switching power converters has become increasingly important due to the advancements andĪffordability of micro-controller technology. Output voltage and high current capability, power audio amplifiers, power inverters, and motor drives. It is widely used in various applications such as computer systems (as point-of-load converter) due to its low ANALYSIS, SIMULATION AND EXPERIMENTATION OF BUCK DC/DC CONVERTER 1 Purposeīuck converter, or step-down converter, is one of the most popular switching converter topologies for power conver.
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