The electric power is not normally used in a form in which it is produced or
distributed. Practically all electronic systems require some form of power conversion.A device that transfers electric energy from a given source to a given load using electronic circuits is referred to as power supply (although ”Power converter” is a more accurate term for such a
device).
2.1 UnderstandingWhen the output voltage set point is less than the input voltage, such regulator is
called a Buck converter. When the output voltage set point is higher, it is a Boost converter. A feedback input is necessary for the regulator to know the state of the output voltage so that it can be kept with in the tolerances required by the power supply design requirements. The converters control the output voltage to the specifications by comparing the output voltage (or current or (both) to an internal reference.
In case of a Linear regulator the power is transferred continuously from Vin to
Vout. In case of a Switching regulator the power is transferred from Vin to Vout in bursts. There are two main types of the switching regulators - inductive and charge pump (capacitive). Not every electronic system needs a regulator. The electronics in a typical system can operate within a narrow band (5% or 10%) around their rated voltage. The battery output voltage declines as the battery discharges. To prolong the usable life of the system, one could use electronics that operate at voltages toward the low end of the battery discharge. But, then the fresh battery
voltage would far exceed the upper tolerance of the electronics. If the electronics were to be chosen for the upper end of battery voltage, then the battery would soon discharge to the lower tolerance of the electronics.
One way to address this issue is wider range electronics, but this could be an
expensive proposition. Another way is to use a regulator. If the battery voltage range is narrow
(e.g. from NiCd cells), a low-dropout linear regulator may be suitable to produce a regulated lower output voltage. If the system voltage is higher than the battery voltage range, or within the range, then a switching regulator in a boost or buck-boost configuration can be used. Direct current-to-direct current (DC/DC) converters with faster switching frequencies are becoming popular due to their ability to decrease the size of the output capacitor and inductor to save board
space. On the other hand, the demands from the point-of-load (POL) power supply increase as processor core voltage drops below 1V, making lower voltages difficult to achieve at faster frequencies due to the lower duty cycle.
Many power IC suppliers are aggressively marketing faster DC/DC converters
that claim to save space. A DC/DC converter switching at 1 or 2 MHz sounds like a great idea,but there is more to understand about the impact to the power supply system than size and efficiency. Several design examples will be shown revealing the benefits and obstacles when switching at faster frequencies.
distributed. Practically all electronic systems require some form of power conversion.A device that transfers electric energy from a given source to a given load using electronic circuits is referred to as power supply (although ”Power converter” is a more accurate term for such a
device).
2.1 UnderstandingWhen the output voltage set point is less than the input voltage, such regulator is
called a Buck converter. When the output voltage set point is higher, it is a Boost converter. A feedback input is necessary for the regulator to know the state of the output voltage so that it can be kept with in the tolerances required by the power supply design requirements. The converters control the output voltage to the specifications by comparing the output voltage (or current or (both) to an internal reference.
In case of a Linear regulator the power is transferred continuously from Vin to
Vout. In case of a Switching regulator the power is transferred from Vin to Vout in bursts. There are two main types of the switching regulators - inductive and charge pump (capacitive). Not every electronic system needs a regulator. The electronics in a typical system can operate within a narrow band (5% or 10%) around their rated voltage. The battery output voltage declines as the battery discharges. To prolong the usable life of the system, one could use electronics that operate at voltages toward the low end of the battery discharge. But, then the fresh battery
voltage would far exceed the upper tolerance of the electronics. If the electronics were to be chosen for the upper end of battery voltage, then the battery would soon discharge to the lower tolerance of the electronics.
One way to address this issue is wider range electronics, but this could be an
expensive proposition. Another way is to use a regulator. If the battery voltage range is narrow
(e.g. from NiCd cells), a low-dropout linear regulator may be suitable to produce a regulated lower output voltage. If the system voltage is higher than the battery voltage range, or within the range, then a switching regulator in a boost or buck-boost configuration can be used. Direct current-to-direct current (DC/DC) converters with faster switching frequencies are becoming popular due to their ability to decrease the size of the output capacitor and inductor to save board
space. On the other hand, the demands from the point-of-load (POL) power supply increase as processor core voltage drops below 1V, making lower voltages difficult to achieve at faster frequencies due to the lower duty cycle.
Many power IC suppliers are aggressively marketing faster DC/DC converters
that claim to save space. A DC/DC converter switching at 1 or 2 MHz sounds like a great idea,but there is more to understand about the impact to the power supply system than size and efficiency. Several design examples will be shown revealing the benefits and obstacles when switching at faster frequencies.
Nice one. Hope this helps many! Also don't forget to see this DC DC Converter in Mumbai
ReplyDelete