变频器原理1(国外英文资料).doc

变频器原理1(国外英文资料) The converter principle knowledge is the basic principle of the 04-15 16:34 converter The frequency converter foundation VVF is the abbreviation for Variable Voltage and Variable Frequency, meaning to change the Voltage and change Frequency, which is what people refer to as variable-voltage Frequency. 2: CVCF is the abbreviation for Constant Voltage and Constant Frequency, meaning Constant Voltage and Constant Frequency, which is what people call Constant Voltage Constant Frequency. We use the power of the divided into ac power and dc power supply, dc power supply are mostly general by ac power through a transformer transformer, rectifier after filtering. Ac power supply is about 95 percent of the total power supply. Whether for home or used in factories, single-phase ac power supply and three-phase ac power supply, the voltage and frequency according to the provisions of the countries have certain standards, as specified on the Chinese mainland, direct user single phase alternating current (ac) is 220 v, three-phase ac voltage is 380 v, 50 hz, power supply voltage and frequency of other countries may be in different voltage and frequency in our country, such as a single-phase 100 v / 60 hz, three-phase 200 v / 60 hz, etc., the standard of the voltage and frequency of the ac power supply ac power frequency. In general, the device that sets the voltage and frequency constant to the alternating current of alternating current to voltage or frequency is called a frequency changer. In order to produce a variable voltage and frequency, the device first changes the alternating current of the power supply to direct current (DC), a process called rectifier. A device that transforms DC to AC (AC), whose scientific term is inverter (inverter). The general inverter is the inverter power source that inverses dc power supply to certain fixed frequency and voltage. In the case of inverters, the inverters that are adjustable and voltage adjustable are called inverte