Innovative measuring instruments are needed to be able to test and optimize the drive train of an electric vehicle. They must enable both highly accurate power measurements and calculation of various intermediate values. A pulse width modulated inverter converts a DC voltage into an AC voltage with variable frequency and amplitude.
The currents and voltages are measured in all three lines. Despite the pulsed voltage of the pulse width modulated inverter, the current is still approximately sinusoidal. Therefore, the current signal is used to derive the cycle time for mean-value calculation in the power measurement.
The fundamental magnitude of the output voltage from an inverter can be external control circuitry is required. The most efficient method of doing this is by Pulse Width Modulation (PWM) control used within the inverter. In this scheme the
The inverter essentially converts the input DC voltage into voltage pulses through pulse width modulation (PWM) such that the average voltage during a given switching period equals the desired voltage command . The motor then generates current and torque which are applied to the mechanical system within which the electric motor drive is used.
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The inverter input voltage at the bulk capacitor differs from the battery voltage due to the power input filtering circuit that precedes it [16]–[18]. Sensors for motor currents [19]–[26] …
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In battery-fed pulse width modulated inverters, a high battery current ripple can cause electromagnetic interference problems or increased losses. A proper battery, cable and …
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The mathematical model of a cascaded three-phase bridge inverter is established in this paper. Based on the voltage and current equations of a multilevel inverter, a new …
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Power Measurements on a Pulse Width Modulated Inverter with Perception Software Accurate and highly dynamic power measurements are required for assessing and testing electric drives …
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The mathematical model of a cascaded three-phase bridge inverter is established in this paper. Based on the voltage and current equations of a multilevel inverter, a new …
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The internal resistance (IR) value of the battery, which can predict the lifetime characteristics, increases owing to harmonics, ambient temperature, and chemical reactions …
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An inverter is connected between a source of DC power and a three-phase AC induction motor, and a microprocessor-based circuit controls the inverter using pulse width modulation …
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