Power consumption of the inductor in the switching power supply

As we all know, the inductance loss includes two aspects: one is the loss associated with the core, that is, the traditional iron loss; the other is the loss associated with the inductor winding, which is commonly called copper loss.

The power inductor acts as an energy storage component in the switching power supply. The magnetic energy is stored during the on-time of the switch, and the stored energy is transferred to the load during the disconnection of the switch. Hysteresis is a typical property of magnetic core materials, which is the loss of the inductive core. The larger the magnetic permeability, the narrower the hysteresis curve and the smaller the core power consumption.

The energy loss due to the change in magnetic field strength of the inductor during one switching cycle is the difference between the magnetic energy of the input inductor during the on-time of the switch and the output magnetic energy during the opening of the switch.

In addition to the hysteresis loss of the inductor core, the second major loss is the eddy current loss. Inductive eddy currents flowing in the core will produce I2 x R (or V2/R) power dissipation. Due to the high resistance properties of magnetic core materials, eddy current losses are typically much less than hysteresis losses, and the core losses typically given in the data sheet include eddy current losses and hysteresis losses.

Measuring the loss of the core is difficult because it includes cumbersome magnetic induction measurements and hysteresis loop area estimation, which are not available from most inductor manufacturers.

SCSI-180Â°DIP Section

Small computer system interface (SCSI) is an independent processor standard for system level interfaces between computers and intelligent devices (hard disks, floppy drives, optical drives, printers, scanners, etc.). SCSI is an intelligent universal interface standard.

1. SCSI can support multiple devices, SCSI-2 (fastscsi) can connect up to 7 SCSI devices, and widescsi-2 can connect 15 SCSI devices. In other words, all devices only need to occupy one IRQ. At the same time, SCSI also supports a wide range of devices, such as CD-ROM, DVD, CDR, hard disk, tape drive, scanner, etc.

2. SCSI also allows one device to transfer data and another device to look up its data. This can achieve higher performance in multitasking operating systems such as Linux and windows NT.

3. SCSI occupies a very low CPU, so it has obvious advantages in multitask system. Since the SCSI card itself has a CPU, it can handle all the transactions of SCSI devices. When the host CPU sends work instructions to the SCSI card, the SCSI card will work by itself. After the work is finished, the work results will be returned to the CPU. In the whole process, the CPU can carry out its own work.

4. The SCSI device is also intelligent. The SCSI card can queue CPU instructions by itself, which improves the work efficiency. In multitasking, the hard disk will be in the current head position, and the adjacent tasks will be completed first and then processed one by one.

5. The fastest SCSI bus has a bandwidth of 160MB / s, which requires the use of a 64 bit 66MHz PCI slot. Therefore, the maximum speed that can be achieved in the PCI-X bus standard is 80mb / s. if it is used with a dedicated hard disk with 10000rpm or 15000rpm, it will bring obvious performance improvement.

SCSI-180Â°DIP Section

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