Ads
related to: power supply current limiter circuit
Search results
Results From The WOW.Com Content Network
A foldback current limiter may also employ a transient delay to avoid lockout and limit localized heating at the short circuit. A switched-mode power supply operating at the current limit with the output short-circuited does not have increased power dissipation in the power transistor(s), so foldback current limiting is an application feature ...
An inrush current limiter is a component used to limit inrush current to avoid gradual damage to components and avoid blowing fuses or tripping circuit breakers. Negative temperature coefficient (NTC) thermistors and fixed resistors are often used to limit inrush current. NTC thermistors can be used as inrush-current limiting devices in power ...
Its resistance begins to drop, and a relatively small current flow charges the input capacitors. After the capacitors in the power supply become charged, the self-heated inrush current limiter offers little resistance in the circuit, with a low voltage drop with respect to the total voltage drop of the circuit.
In addition to the current limiting function, the device serves to filter out spikes of current and may also reduce injection of harmonic currents into the power supply. The most common type is designed for three-phase electric power , in which three isolated inductors are each wired in series with one of the three line phases. [8]
Upon completion of pre-charging, the pre-charge resistance is switched out of the power supply circuit and returns to a low impedance power source for normal mode. The high voltage loads are then powered up sequentially. The simplest inrush-current limiting system, used in many consumer electronics devices, is a NTC resistor.
As an inrush current limiter device in power supply circuits, they present a higher resistance initially, which prevents large currents from flowing at turn-on, and then heat up and become much lower resistance to allow higher current flow during normal operation.
Ads
related to: power supply current limiter circuit