CN104598003A - Design method for restraining surge current of hard disk by soft start of chip - Google Patents

Abstract

The invention discloses a design method for suppressing the surge current of a hard disk by using the soft start of the chip. Firstly, the circuit of the hot-swappable chip is controlled to work through the power-on signal, and then the soft-start function of the hot-swappable chip is used to make the chip generate a driving signal to slowly Turn on the load switch on the power supply link. The hot-swapping line adjusted by the method of the invention can output a drive signal to control the load switch tube to slowly open, thereby reducing the instantaneous large current when the load switch tube is turned on.

Description

A Design Method of Using Chip Soft-Start to Suppress Hard Disk Surge Current

technical field

The invention relates to the field of cloud server power supply, in particular to a design method for suppressing hard disk surge current by using chip soft start.

Background technique

With the rapid development of the Internet and the continuous rise of cloud computing technology, the online business volume continues to increase. Higher requirements are put forward for the data processing capability and storage capacity of the server in the computer room. The general large-scale data center computer room costs every inch of land. Whether it is a rented computer room or a self-built computer room, the rent and cost are very expensive. In order to save floor space and make full use of space, RACK cabinet products for high-density deployment came into being. Such products generally have three characteristics: centralized power supply, centralized heat dissipation, and centralized management. In order to improve the data processing capability and storage capacity of server nodes in the unit space as much as possible, it is generally deployed in the cabinet according to the actual application situation: 20 or 32 server nodes, each node is drawn from the cabinet in the form of a 1U tray Pull out for easy operation and maintenance.

A high-density rack cabinet server system is generally composed of many server nodes, and each node is generally composed of four parts: a node tray, a main board, a hard disk, and a power board. Usually, the motherboard and hard disks of the nodes in the RACK cabinet are fixed in a 1U tray. The current node is deployed in a 1U chassis tray according to the configuration of 1 node and 8 hard disks. Since the main board, hard disk, and power board are deployed in the 1U tray; the main board and hard disk are both powered from the power board. During the actual debugging process, when the number of hard disks deployed on the node is At the moment of starting up, the +12V and +5V on the power board supplying power to the hard disk will both have a phenomenon of excessive instantaneous surge current. When the +12V power supply to the hard disk has a large surge current, if the node frequently starts up, it will cause damage to the motor of the hard disk; when the +5V power supply to the hard disk has an excessive surge current, the +5V power supply line triggers OCP (Over Current Protection) will eventually lead to system downtime.

As shown in FIG. 1 , it is a schematic structural diagram of a single node in a RACK cabinet server system. The node supports eight 3.5-inch hard disks. The upper part of the node takes power from the 12V busbar (busbar) through two power-taking terminals. Hard disk 12V and 5V power supply and motherboard power supply: P12V power supply for the motherboard, P12V_EDD and P5V_HDD power supply for the hard disk. The power supply board and the power adapter board are interconnected through power supply adapter wires.

As shown in Figure 2, it is a structural diagram of the hard disk power supply before improvement. The P12V_HDD and P5V_HDD used by the hard disk are controlled through the load switch circuit. When the node is turned on, because the signal PSON controlling the load switch directly drives the load switch tube without processing, the switch tube is quickly opened, so that the P12V_HDD and P5V_HDD powered by the hard disk will generate a large surge current at the moment of power-on, and the instantaneous large current will cause The service life of the hard disk is reduced, and even the hard disk is damaged.

Contents of the invention

The technical problem to be solved by the present invention is: In order to overcome this problem, this paper proposes a design method of using chip soft start to suppress the surge current of the hard disk, which is used to suppress the large current at the moment of starting up and prevent the system from going down.

The technical scheme adopted in the present invention is:

A design method that uses chip soft start to suppress the inrush current of the hard disk. First, the circuit of the hot-swappable chip is controlled to work through the power-on signal, and then the soft-start function of the hot-swap chip is used to make the chip generate a driving signal to slowly open the power supply link. On the load switch tube, thereby reducing the surge current generated during the opening process of the load switch tube, and protecting the hard disk device.

When the hot-swap line is powered on, the hot-swap chip is enabled by the ENABLE signal, the hot-swap chip starts to work, and performs a soft start action; at the same time, the hot-swap chip outputs a driving signal, which slowly climbs from a low level To a high level, control the load switch to open slowly.

One end of the hot-swappable chip is connected to an enabling signal (PSON signal), one end is connected to VDD, one end outputs a driving signal GATE to control a load switch tube, and one end is grounded through a Css capacitor connected in series.

Adjust the rise time of the driving signal GATE by adjusting the capacitor value of Css.

The capacitance of Css is set according to the SOA (ie: safe operating area, safe operating area) curve of the load switch tube.

Beneficial effects of the present invention: the hot-swappable line adjusted by the method of the present invention can output a driving signal to control the slow opening of the load switch tube, thereby reducing the instantaneous large current when the load switch tube is turned on.

Description of drawings

Figure 1 is a schematic diagram of a single node of the RACK cabinet system;

Figure 2 is a structure diagram of hard disk power supply before improvement;

Figure 3 is a schematic diagram of the improved hard disk power supply structure;

FIG. 4 is a schematic diagram of the principle of a hot-swappable chip controlling a load switch tube.

Detailed ways

Below according to accompanying drawing of description, in conjunction with specific embodiment, the present invention is further described:

A design method that uses chip soft start to suppress the inrush current of the hard disk. First, the circuit of the hot-swappable chip is controlled to work through the power-on signal, and then the soft-start function of the hot-swap chip is used to make the chip generate a driving signal to slowly open the power supply link. On the load switch tube, thereby reducing the surge current generated during the opening process of the load switch tube, and protecting the hard disk device.

When the hot-swap line is powered on, the hot-swap chip is enabled by the ENABLE signal, the hot-swap chip starts to work, and performs a soft start action; at the same time, the hot-swap chip outputs a driving signal, which slowly climbs from a low level To a high level, control the load switch to open slowly.

As shown in FIG. 4 , one end of the hot-swappable chip is connected to an enabling signal (PSON signal), one end is connected to VDD, one end outputs a driving signal GATE to control a load switch tube, and one end is grounded through a Css capacitor connected in series.

Adjust the rise time of the driving signal GATE by adjusting the capacitor value of Css.

The capacitance of Css is set according to the SOA (ie: safe operating area, safe operating area) curve of the load switch tube.

As shown in Figure 3, the VR is controlled by the control signal PSON: the P12V to P5V line works, because the VR line has a soft start function. Therefore, the VR chip is enabled through the control signal PSON to ensure that the surge current of P5V_HDD is greatly reduced at the moment of power-on;

At the same time, on the P12V_HDD line that supplies power to the hard disk, add a hot-swappable chip separately, use the control signal PSON to enable the chip, and then the chip will generate a slowly rising drive signal to slowly turn on the load switch tube. Therefore, it is ensured that the surge current of P12V_HDD is greatly reduced at the moment of starting up.

The implementation steps are as follows:

1) According to the structure diagram in Figure 3, add the P12V/P5V_HDD voltage conversion circuit in the schematic diagram of the power adapter board, and use the power-on trigger signal PSON as the enable control signal of the VR chip; to realize the power supply of the hard disk P5V_HDD ;

2) On the basis of the 1) line, add the P12V switching P12V_HDD line. Specifically, in the schematic diagram of the power adapter board, add a hot-swappable chip (eg: ISL6115) control switch circuit, use the PSON boot trigger signal in 1) to enable the hot-swappable chip to switch the hard disk P12V_HDD voltage, for Hard disk power supply 12V;

3) Through 1) and 2), the power supply design of the hard disk 12V and 5V can be completed, ensuring that the surge current of the hard disk 12V and 5V is greatly suppressed at the moment of starting up, so as to achieve the purpose of protecting the hard disk device.

The above embodiments are only used to illustrate the present invention, but not to limit the present invention. Those of ordinary skill in the relevant technical field can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, all Equivalent technical solutions also belong to the category of the present invention, and the scope of patent protection of the present invention should be defined by the claims.

Claims (4)

1. A design method that utilizes chip soft start to suppress hard disk surge current, is characterized in that: at first control hot-swappable chip line work by power-on signal, then utilize the soft-start function of hot-swappable chip, make chip produce driving signal To slowly open the load switch tube on the power supply link. 2. A design method for suppressing hard disk surge current by using chip soft start according to claim 1, characterized in that: one end of the hot-swappable chip is connected to the enable signal, one end is connected to VDD, and one end outputs the drive signal GATE Control the load switch tube, and one end is grounded through a Css capacitor connected in series. 3. A design method for suppressing hard disk surge current by using chip soft start according to claim 2, characterized in that: the ramp-up time of the drive signal GATE is adjusted by adjusting the capacitance value of Css. 4. A design method for suppressing hard disk surge current by using chip soft start according to claim 3, characterized in that: the capacitance of Css is set according to the SOA curve of the load switch tube.