SPWM/ SVPWM Filters and Magnetics
SPWM filtering Sine wave inverter filter
A Sine PWM inverter needs an output filter for elimination of the carrier frequency components.
The output of the Sine PWM inverter consists of the fundamental frequency and harmonics at carrier frequency and / or as side-bands around multiples of the carrier frequency. Filtering is needed to eliminate the harmonics and only pass the fundamental to the load. Various schemes for filtering exist using L, LC, LCL and higher order combinations. [1] LC is selected due to it’s relative simplicity, reasonably high attenuation -40db/decade is needed as the difference between the pass band ( cut-off frequency of 100Hz ) and the nearest frequency to be attenuated (1000Hz) is only one decade.
SPWM/SVPWM Inverter 1Ph LC filter
15A three-phase LC low-pass filter, filter inductance xxmH/15A, filter capacitance xxuF/800V, theoretical filter cut-off frequency 796Hz, can be used for output filtering of three-phase SPWM inverter or three-phase SVPWM inverter, input uvw, output ABCN, where N is the neutral point of three-phase star connected filter capacitor. The filter capacitor of the filter uses high voltage and high frequency turn off step less capacitor, and uses high current terminal blocks. The PCB circuit is wider, and the routing design is more convenient to add solder, thus improving the current carrying capacity! A single phase can also be used as a single-phase LC filter independently. At this time, the input is connected to U and N, and the output is connected to A and N.
SPWM/SVPWM Inverter 3PHASE LC filter
5A three-phase LC low-pass filter, filter inductance 2xxH/5A, filter capacitance xxuF/630V, theoretical filter cut-off frequency 1642Hz, can be used for output filtering of three-phase SPWM inverter or three-phase SVPWM inverter, input UVW, output ABCN, where N is the neutral point of three-phase star connected filter capacitor. A single phase can also be used as a single-phase LC filter independently. At this time,the input is connected to U and N, and the output is connected to A and N.
1kW TO 5kW(4A to 25A) Sendust SPWM Filtering Sine Wave Inverter Filter and PFC Inductor
When saturable inductors are employed as output filters, the flux increment (δλ) per current increment (δi) rapidly decreases as the operating current (i0) magnitude increases. This phenomenon is called the saturation of the magnetic core. The phenomenon and corresponding inductance-current characteristics for the practical inductor which is made of sendust material as powder alloy are shown.
Iron Silicon Aluminum Sine Wave Inverter Filter Inductor
The iron-silicon-aluminum magnetic core is one of the magnetic cores with higher usage. In simple terms, the iron-silicon-aluminum is composed of aluminum-silicon-iron, which has a relatively high B max (1050tM), and its core loss is much lower than that of iron. Powder core and high magnetic flux, low magnetostriction (low noise), low-cost energy storage material, no heat aging, can be used to replace iron powder core, and its performance is very stable at high temperature.
The main characteristic of iron-silicon-aluminum is that it has lower DC loss than iron powder core and has good DC bias current characteristics. The price is not the highest, but not the lowest, compared to the iron powder core and iron nickel molybdenum.but not the lowest, compared to the iron powder core and iron.
Planar Magnetics
Basically this is a construction method of inductive components whose windings are created from multi-layer printed circuit boards. These windings are then placed in low profile, E/E or E/I ferrite core combinations. Planar devices can be constructed as stand-alone components or integrated into multi-layer printed circuit boards, with slots cut to accept the ferrite E core.
300 to 1000W planar transformers
power capacity 300 to 1000w medium power Low profile High effieciency excellent repeatabily size 200.
500 to 2.6kW planar transformers
power capacity 500 to 2.6w medium power Low profile High unique insulationsolution size 250.
500 to 5kw planar transformers
500 to 5kw planar transformers.
1kw to 10kW planar transformers
power capacity 500 to 2.6w medium power Low profile High unique insulationsolution size 270.
Ferrite Core Transformers and Inductors
Ferrite cores are an oxide created with Iron, Manganese, and Zinc. Ferrite Cores are commonly referred to as manganese zinc ferrites. Due to their low losses at high frequencies, ferrite cores are regularly used in switched-mode power supply and radio frequency. Ferrite cores are available in many shapes and sizes for inductors and feature many excellent characteristics.
