JPH0739150A - Power supply apparatus - Google Patents

Abstract

PURPOSE:To prevent an inrush current from flowing into a power supply part without providing an inrush prevention part when the power-supply part is connected by insertion of a hot line by a method wherein a capacitor is separated from a secondary smoothing part and the power supply part can be inserted into, and pulled out from, a load in a state that the separated capacitor has been connected to the load. CONSTITUTION:An output from a secondary smoothing part 12 in a power- supply part 14 for a power supply device 15 is input to a tertiary smoothing part 13 via a connection part 8, and it is smoothed by a capacitor C2. Then, when the power supply part 14 is connected, by a hot-line connection, to feeding buses 9, 10 which supply a power supply to a load 11 by power supply devices 17, 19, the capacitor C2 in the tertiary smoothing part 13 is charged via the feeding buses 9, 10 by the power supply devices 17, 19. Consequently, even when an inrush prevention part provided with a diode is not installed, it is possible to prevent an inrush current from flowing into the power supply part 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply device, and more particularly to a hot-swap power supply device.

[0002]

2. Description of the Related Art In an information processing device or the like, in order to make the device non-stop, a plurality of power supply devices are connected in parallel,
When a failure occurs in one of the multiple power supplies, only the failed power supply is stopped,
A power supply unit that supports so-called hot-plugging and unplugging (power supply that supports hot-plugging and unplugging) that can replace a power supply unit that has failed while power is being supplied to the load by another power-supply unit. Device) is often used.

FIG. 2 is a circuit diagram showing an example of a conventional hot-swap power supply device.

As shown in FIG. 2, such a conventional hot-swap power supply device is configured so that power supplies 22 and 23 and 24 are connected in parallel to supply power to the load 11. There is.

The power supply unit 22 rectifies and smoothes the commercial power supply 1 supplied from the connection point 4 via the power supply buses 2 and 3 by the rectification stack BD1 and the capacitor C1 and the primary rectification smoothing unit 5. A switching unit 6 that outputs the output of the unit 5 to the secondary side of the transformer T1 by switching the transistor Q1, and an output of the secondary side of the transformer T1 of the switching unit 6 by the diode D3 and the diode D4, the choke coil L2, and the capacitor C3. The secondary smoothing unit 20 for smoothing and the capacitor C3 from the connection point 8 via the power feeding buses 9 and 10.
And a rush prevention unit 21 having a diode D5 provided to prevent a rush current flowing into the. The power supply devices 23 and 24 have the same configuration as the power supply device 22.

The operation of the power supply device configured as described above will be described.

The commercial power supply 1 supplied from the connection point 4 to the primary rectifying / smoothing unit 5 is full-wave rectified by the rectifying stack BD1 and smoothed by the capacitor C1. The output of the switching control unit 7 is controlled by the switching control unit 7. 6
Is output to the secondary side of the transformer T1 by switching of the transistor Q1. That is, the transistor Q
When 1 is on, a current flows through the primary side of the transformer T1, so an electromotive force is generated on the secondary side of the transformer T1.

The electromotive force generated on the secondary side of the transformer T1 is input to the secondary smoothing section 20 and smoothed by the diodes D3 and D4, the choke coil L2 and the capacitor C3, and the diode D5 of the inrush prevention section 21 is connected. It is output through.

When the transistor Q1 of the switching section 6 is off, the choke coil L2 is turned on by the transistor Q1.
When the power is on, the stored energy is discharged, the energy is smoothed by the capacitor C3, and is output through the diode D5 of the rush prevention unit 21.

The load 11 is supplied by the power supplies 23 and 24.
To the power supply buses 9 and 10 that supply power to
When the power supply device 22 is connected by hot-swap, the capacitor C3 of the secondary smoothing unit 20 is connected until the commercial power supply 1 is connected to the power supply device 22 and the switching unit 6 starts switching. Will not charge. If the power supply device 22 is connected to the power supply buses 9 and 10 before the capacitor C3 is charged, an inrush current will try to flow from the power supply devices 23 and 24 into the capacitor C3 of the secondary smoothing unit 20 of the power supply device 22. Diode D5 of prevention unit 21
Prevent it.

[0011]

In the conventional hot-swap power supply device as described above, when the power is supplied to the load, the diode of the rush prevention unit is frequently damaged, so that the power supply It has the disadvantage that the efficiency of the device is low.

[0012]

SUMMARY OF THE INVENTION A power supply device according to the present invention comprises a primary rectifying / smoothing section for rectifying and smoothing a commercial power source, and a secondary side of a transformer by switching the output of the primary rectifying / smoothing section by a transistor. A switching section for outputting the output of the transformer, a secondary smoothing section for outputting the output of the secondary side of the transformer of the switching section via a diode and a choke coil, and an output of the secondary smoothing section at a connection point. And a third-order smoothing unit for smoothing by a capacitor.

[0013]

Embodiments of the present invention will now be described with reference to the drawings.

FIG. 1 is a circuit diagram showing an embodiment of the present invention.

In FIG. 1, power supply devices 15, 17 and 19 are connected in parallel to supply power to load 11.

The power supply device 15 rectifies and smoothes the commercial power supply 1 supplied from the connection point 4 via the power supply buses 2 and 3 by the rectification stack BD1 and the capacitor C1, and the primary rectification smoothing unit 5. A switching unit 6 that outputs the output of the unit 5 to the secondary side of the transformer T1 by switching the transistor Q1, and outputs the output of the secondary side of the transformer T1 of the switching unit 6 via the diode D1 and the diode D2 and the choke coil L1. A power source unit 14 having a secondary smoothing unit 12 and a third smoothing unit 13 connected to the power source unit 14 by a connection point 8 and smoothing its output by a capacitor C2. The power supply devices 17 and 19 have the same configuration as the power supply device 15.

Next, the operation of the power supply device configured as described above will be described.

The commercial power source 1 supplied from the connection point 4 to the primary rectifying / smoothing unit 5 of the power source unit 14 is full-wave rectified by the rectifying stack BD1 and smoothed by the capacitor C1. The output is controlled by the switching control unit 7. It is output to the secondary side of the transformer T1 by the switching of the transistor Q1 of the switching unit 6. That is, when the transistor Q1 is on, a current flows in the primary side of the transformer T1, and therefore an electromotive force is generated in the secondary side of the transformer T1.

The electromotive force generated on the secondary side of the transformer T1 is input to the secondary smoothing unit 12 and output from the connection point 8 via the diodes D1 and D2 and the choke coil L1. The output from the secondary smoothing unit 12 is input to the tertiary smoothing unit 13 via the connection point 8 and the capacitor C2
Smoothed by

When the transistor Q1 of the switching section 6 is off, the choke coil L1 operates as a transistor Q1.
When the power is on, the stored energy is released, and the energy is smoothed by the capacitor C2 of the third-order smoothing unit 13 and output.

The load 11 is supplied by the power supplies 17 and 19.
To the power supply buses 9 and 10 that supply power to
When the power supply unit 14 is connected by hot plugging and unplugging, the capacitor C2 of the tertiary smoothing unit 13 is charged by the power supply devices 17 and 19 via the power feeding buses 9 and 10. Therefore, inrush current does not flow into the power supply unit 14 from the capacitor C2.

[0022]

As described above, in the power supply device of the present invention, the capacitor is separated from the secondary smoothing section, a connection point is provided between the separated capacitor and the secondary smoothing section, and the separated capacitor is loaded. By allowing the power supply unit to be inserted into and removed from the load at this connection point while being connected to the power supply, it is possible to prevent inrush current from flowing into the power supply unit even without the inrush prevention unit having a diode. Therefore, there is an effect that it is possible to prevent a decrease in efficiency of the power supply device due to damage to the diode of the rush prevention unit.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention.

FIG. 2 is a circuit diagram showing an example of a conventional power supply device compatible with hot-plugging and unplugging.

[Explanation of symbols]

 1 Commercial power supply 2/3/9/10 Power supply bus 4.8 Connection point 5 Primary rectifying / smoothing part 6 Switching part 7 Switching control part 11 Load 12/20 Secondary smoothing part 13 Tertiary smoothing part 14 Power supply part 15/17/19・ 22 ・ 23 ・ 24 Power supply device 21 Inrush prevention part

Claims (2)

[Claims] 1. A primary rectifying / smoothing unit for rectifying and smoothing a commercial power source, a switching unit for outputting an output of the primary rectifying / smoothing unit to a secondary side of a transformer by switching a transistor, and the switch. Secondary smoothing unit that outputs the secondary side output of the transformer through the diode and choke coil, and a tertiary smoothing unit that inputs the output of the secondary smoothing unit through a connection point and smoothes it with a capacitor A power supply device comprising: a smoothing unit. 2. A primary rectifying / smoothing unit for rectifying and smoothing a commercial power source, a switching unit for outputting an output of the primary rectifying / smoothing unit to a secondary side of a transformer by switching a transistor, and the switch. A switching control unit that controls the operation of the switching unit, and a power supply unit that has a secondary smoothing unit that outputs the secondary side output of the transformer of the switching unit via a diode and a choke coil, A third-order smoothing unit, which receives the output of the second-order smoothing unit of the power supply unit via a connection point and smoothes it by a capacitor.