* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Download closedloo
Spark-gap transmitter wikipedia , lookup
Power engineering wikipedia , lookup
Control system wikipedia , lookup
Transmission line loudspeaker wikipedia , lookup
Electrical ballast wikipedia , lookup
Electrical substation wikipedia , lookup
History of electric power transmission wikipedia , lookup
Solar micro-inverter wikipedia , lookup
Three-phase electric power wikipedia , lookup
Stray voltage wikipedia , lookup
Power inverter wikipedia , lookup
Integrating ADC wikipedia , lookup
Current source wikipedia , lookup
Surge protector wikipedia , lookup
Schmitt trigger wikipedia , lookup
Mains electricity wikipedia , lookup
Variable-frequency drive wikipedia , lookup
Pulse-width modulation wikipedia , lookup
Alternating current wikipedia , lookup
Voltage optimisation wikipedia , lookup
Resistive opto-isolator wikipedia , lookup
Voltage regulator wikipedia , lookup
Current mirror wikipedia , lookup
Switched-mode power supply wikipedia , lookup
All figures used in the slides are from National Semiconductor Analog University http://webench.national.com/en/power/analogu.html In a real converter, when the load current steps down, the excessive energy of an output inductor has to be delivered to the output capacitor, causing the output voltage spikes. When the load current steps up, the inductor restores its energy while the output capacitor supplies the load, causing the output voltage sags. fc = 27 kHz m= 8 deg. 100mv/Div 400mA 200mA Transient response A is slower than B because its crossover frequency is lower than B's. Transient response C and D have rings because of the small phase margin. The hysteretic regulator does not have compensation circuitry that requires an accurate design in the whole input-voltage, output-voltage, temperature, and load-current range. This compensation can be further complicated if additional capacitors are added to the output of the voltage regulator around the microprocessor package. The main problem associated with the hysteretic type regulator relates to the ability to predict its switching frequency due to the dependence of this parameter on the output filter characteristics and circuit operation. Hysteretic controllers have excellent load current transient-response characteristics compared to the other types of controllers (such as PWM voltage and current mode) with slow feedback loops. The controllers react to transients within the same cycle in which the transient occurs and keep the corresponding FET in an on-state until the output voltage returns to the required dc level. Thus a minimum number of bulk output capacitors are required, saving total system cost.