REGULATOR_CIRCUIT_FOR_BILATERAL_SOURCE_LOAD_POWER_SYSTEM

Published:2009/6/23 4:10:00 Author:May | From:SeekIC

The figure shows a circuit that regulates an output voltage, regardless of the direction of flow of output current. More specifically, it regulates the voltage at the left source or load, which can either supply power to or receive power from the right load or source, depending on the voltages and the direction of flow of current at the load/source terminals.The overall system can be characterized as a voltage-controlled current source with bilateral current capability. The current flowing between the two source/loads, averaged over a power-switching cycle, is made to depend on the pulse-width modulation that governs the operation of the two power-switching devices, and this pulse-width modulation is, in turn, a function of amplified currenterror and voltage-error signals. The voltage error is the difference between the actual output voltage and the output-reference voltage, which is the nominal output voltage at zero current. The pulsewidth modulation is varied to increase or decrease the current, as needed, to limit the excursion of output voltage from the reference value.An additional feature of this control circuit is that the maximum current in either direction can be limited by limiting the excursion of the output voltage from the zero-current value. Thus, external current-limiting circuitry is not necessary.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Basic_Circuit/Analog_Circuit/REGULATOR_CIRCUIT_FOR_BILATERAL_SOURCE_LOAD_POWER_SYSTEM.html

Print this Page | Comments | Reading(3)