High Voltage Switchgear And Breaker Products Hitachi

Why is a high voltage measurement necessary for power efficiency measurement?

Therefore, the power efficiency measurement requires a high voltage measurement. Since WPT transfers power through coils, the transmit/receive part has a very low power factor. When the power factor is low, the phase error greatly affects the measured value, so power measurement with a low phase error is essential. Figure 5.

How to analyze high frequency switching behavior of a high-power full-bridge inverter?

To analyze high frequency switching behavior of an inverter accurately, an accurate IGBT model is essential. In this study, an insulated gate bipolar transistor (IGBT) is modeled using datasheet and measurement data to analyze the high frequency characteristics of a high-power full-bridge inverter.

What is the difference between a converter and an inverter?

Since different machines have different frequency and voltage requirements, a circuit known as a converter is used to convert AC current from the power grid to a DC current, and then an inverter is used to convert the DC current to an AC current with the frequency and voltage required by the machinery being driven.

Do you need a volt meter for an inverter?

Consequently, it's necessary to use a true RMS voltmeter (digital multimeter) and current meter (clamp meter). On the secondary side of an inverter, the voltage and current's fundamental wave includes harmonic components.

Why is inverter testing necessary?

Inverter testing is necessary in order to check for malfunctions of the inverter. This section introduces insulation resistance testing and voltage/current measurement, two tasks that are sometimes used in inverter testing. Insulation resistance testing is used to check for degradation in wire insulation.

Is a power inverter a source of EMI?

Consequently, a power inverter composed of several switching devices has been a source of EMI in the power electronic system. In medium power industry, the insulated gate bipolar transistor (IGBT), which has the capability of high switching speed and high current flowing, has been widely used as switching device in power converters.