Question

Power electronics question

2) Consider that you have a single-phase H-Bridge inverter Using this triangle waveform as your guide, sketch the output voltage of a single phase H-bridge inverter with an input voltage of 200 V dc and an output voltage with the following characteristics: - Peak voltage = 170 V - Frequency=1/15 that of the triangle Indicate in the figures all important values. Assume that there is not filter at the inverter output. Relative Amplitude Amplitude

Answer 1

S4

An H bridge is an electronic circuit that switches the polarity of a voltage applied to a load. These circuits are often used in robotics and other applications to allow DC motors to run forwards or backwards.

Most DC-to-AC converters (power inverters), most AC/AC converters, the DC-to-DC push–pull converter, most motor controllers, and many other kinds of power electronics use H bridges. In particular, a bipolar stepper motor is almost invariably driven by a motor controller containing two H bridges.

when switches s1 and s4 the motor turns in one direction and when s2 and s3 is on the motor turns in opposite direction.

H bridge inverter converts dc power to ac power at desired output voltage and frequency. The dc power input to the inverter is obtained from an existing power supply network or from a rotating alternator through a rectifier or a battery, fuel cell, photovoltaic array or magneto hydrodynamic generator. The filter capacitor across the input terminals of the inverter provides a constant dc link voltage. The inverter therefore is an adjustable-frequency voltage source.

Asked that,taking triangular waveform as guide,skecth the output waveform.that means from the amplitude 1 in the triangular waveform, it implies 200v. and frequncy of output waveform is 1/15th of the given triangle implies that 15 full traingles of the reference waveform constitutes of one full waveform of the output waveform.

V(tre) a ndre inpud voltage = te 7 Peak voltage 200V DC 75 triangles frequency of output wow eforms is ligth of the reference guide waveforma & 15 full triangles of ref.guide equals to due eyle ogole warefom ando 1 auplitude = 200 voce 7 and peaks output voltage = How -