By: Engr.Zeeshan Haider Bangash
Some renewable energy power generation systems, such as solar, produce Direct Current (DC). Inverters, convert DC current into AC current allowing us to use these renewable energy sources for powering our homes and businesses.Over the past century, inverters have evolved from basic electrical concepts to complex combinations of power electronics and digital controls.
Inverters began in the late 19th century as electromechanical devices in the form of rotary converters or motor-generator sets (MG-Set).-If you invert the connections to a MG-set (converter) and you put DC in, you get AC out. Hence an inverter is an inverted converter. Early twentieth century -vacuum tubes and gas filled tubes 1947 -transistor-Low voltage thresholds restricted use in power conversion 1957 -Silicon Controlled Rectifier (SCR’s or Thyristors)-Initiated the transition to high power solid state inverter circuits-Of particular interest was the Gate Turn Off Thyristor (GTO).
1979 -Insulated Gate Bipolar Transistor (IGBT)-Three-terminal power semiconductor device, noted for high efficiency and fast switching -Combines best characteristics of several types of transistors in a single device -Base technology for today’s inverters-Much more efficient and faster now Today -Digital technology (Pulse-width modulation -PWM) combined with IGBT’s-Modulates the duty cycle of a power source to control the amount of power sent to a load -Rapid switching and PWM cancels harmonics making the output look like a pure sine wave-Digital control provides increased reliability, accuracy and performance.
By: Engr.Zeeshan Haider Bangash
Some renewable energy power generation systems, such as solar, produce Direct Current (DC). Inverters, convert DC current into AC current allowing us to use these renewable energy sources for powering our homes and businesses.Over the past century, inverters have evolved from basic electrical concepts to complex combinations of power electronics and digital controls.
Inverters began in the late 19th century as electromechanical devices in the form of rotary converters or motor-generator sets (MG-Set).-If you invert the connections to a MG-set (converter) and you put DC in, you get AC out. Hence an inverter is an inverted converter. Early twentieth century -vacuum tubes and gas filled tubes 1947 -transistor-Low voltage thresholds restricted use in power conversion 1957 -Silicon Controlled Rectifier (SCR’s or Thyristors)-Initiated the transition to high power solid state inverter circuits-Of particular interest was the Gate Turn Off Thyristor (GTO).
1979 -Insulated Gate Bipolar Transistor (IGBT)-Three-terminal power semiconductor device, noted for high efficiency and fast switching -Combines best characteristics of several types of transistors in a single device -Base technology for today’s inverters-Much more efficient and faster now Today -Digital technology (Pulse-width modulation -PWM) combined with IGBT’s-Modulates the duty cycle of a power source to control the amount of power sent to a load -Rapid switching and PWM cancels harmonics making the output look like a pure sine wave-Digital control provides increased reliability, accuracy and performance.
By: Engr.Zeeshan Haider Bangash
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