A High-Performance Pulsewidth Modulator for an Inverter-Fed Drive System Using a Microcomputer

Doing Research In Power Electronics [My View]

“…Gradually, the IPM synchronous motor for EV/HEV drives was accepted all over the world. My other important projects in GE were control development of a linear inductor machine for railroad propulsion, a microcomputer-based hybrid (SPWM-SHE) PWM controller [22] of an inverter, scalar decoupled control of induction motors, control of SRM drives, sliding mode control of induction motors, maximum power point tracking (MPPT) control of residential PV systems [26], etc. I noticed that my manager strongly discouraged simulation studies, which he thought were a waste of time.…”

“…The first microprocessor-controlled fully functional commercial motor drive system paper for EV applications was published in 1979 [21] after Intel 8080 was introduced in 1970. I also introduced microprocessor (Intel 8086)-based SPWM (hybrid with SHE) of fully functional voltage-fed inverter VFI for IM drives [22]. Microprocessors and DSPs are now universally used in the control of power electronic systems.…”

Mathematical modelling of sinusoidal pulse width modulated signal and its implementation on microcontroller based embedded system

“…A flexible and robust microcontroller-based technique for generating the control signals of any sinusoidal pulse width modulation (SPWM) scheme for variable voltage/frequency output is described in [4], where controller's clock was used for generation of PWM control signals. An Intel 8086 microcomputer-based pulse width modulator (PWM) is described in [5], which receives digital voltage and frequency commands independently at the input, generates precision three phase PWM waves at the output. Separate techniques are used for high and low frequency regions.…”

Analysis Design and Simulation of a Three-Phase Three-Level Nine Switches Inverter Using Space Vector Modulation

“…Many different PWM methods have been developed to achieve less THD, easy implementation and less computation time. With the development of microprocessors, space-vector modulation has become one of the most important PWM methods for three-phase converters [2]- [5]. It uses the space-vector concept to compute the duty cycle of the switches and it is simply the digital implementation of PWM modulators.…”

“…all the switching vectors of a three-level (n = 3) multilevel inverter labeled with the position of the equivalent phase switches defined by the first part of equation(5). Note that the reference voltage vector VREF is represented by a circle; the radius of this circ le is First step is the normalization of the reference line-to-line space vector voltage as follows [depends on the number of levels of the multilevel inverter n and the voltage level value of the dc bus capacitors Vd,.-Locating the region of the reference line-to-line refernce space vector, calculating the three nearest line-)-line switching voltages Vab, V,, and V/1, and their switchin4 times are the second step[7].-By inserting switching line-to-line voltages Vb, Vb,, and Vca in equation(2), switches states ka, kh, and k, of V01, /bW,…”