JPH10322899A - Power supply - Google Patents

Abstract

(57) [PROBLEMS] To reduce the cost of a power supply device by turning off the power supply of a computer with a minimum circuit configuration. SOLUTION: An AC voltage / DC voltage converter 11 for converting an input AC voltage into a DC voltage, and a first DC as a main power supply for converting a DC voltage from the AC voltage / DC voltage converter 11 into a predetermined DC voltage. The emergency power-off switch 4 includes a voltage-to-DC voltage converter 14 and a second DC-to-DC voltage converter 17 as an auxiliary power supply for converting the DC voltage from the AC-to-DC voltage converter 11 to a predetermined DC voltage. Is operated, the second DC voltage-DC voltage converter 17 outputs the first DC voltage-
Disconnecting means 27 for disconnecting the supply of operating power to the DC voltage converter is provided.

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 mounted on a computer and for turning off the power by operating an emergency power-off switch of the computer. Power supply devices for computers include an AC voltage-DC voltage converter, a DC voltage-DC voltage converter as a main power supply, a DC voltage-DC voltage converter as an auxiliary power supply, and an AC voltage-DC as a power supply for emergency power-off. A voltage converter and the like are provided. In recent years, such power supply devices for computers have been required to be reduced in size and cost. For this reason,
By turning off the emergency power off switch in case of emergency,
There is a demand for a power supply device that can realize a circuit that realizes a function of immediately turning off all power supplies of a computer at a small size and at low cost.

[0002]

2. Description of the Related Art Conventional power supply devices for computers include:
For example, there is one shown in FIGS. 4 and 5, reference numeral 101 denotes a computer.
1 includes a load 102 such as a logic circuit or a fan and a load 10
A power supply unit (PSU) 103 for supplying power to the power supply 2;
An emergency power-off switch 104 is provided for turning off the power to the load 102 in an emergency such as a fire.

[0005] Reference numeral 105 denotes an AC voltage-DC voltage converter provided in the power supply device 103. The AC voltage-DC voltage converter 105 receives commercial AC (AC) input through a relay contact 106, The AC voltage is converted into a predetermined DC voltage and a first DC voltage
DC voltage converter 107 and a second
To the DC voltage-DC voltage converter 108.

[0004] Second DC voltage-DC voltage converter 10
8 converts the DC voltage received from the AC voltage-DC voltage converter 105 into a predetermined DC voltage, outputs the DC voltage to the control unit 107A of the first DC voltage-DC voltage converter 107, and outputs the first DC voltage-DC The voltage converter 107 is driven. The first DC voltage-DC voltage converter 107 converts the DC voltage from the AC voltage-DC voltage converter 105 into a predetermined DC voltage under the control of the control unit 107A, and outputs the predetermined DC voltage to the load 102.

An AC voltage-DC voltage converter 109 is provided on the AC input side of the power supply device 103 as an emergency power-off power supply (UEPO power supply). A relay coil 110 is provided, and the emergency power-off switch 104 is connected to the relay coil 110. When the emergency power-off switch 104 is closed, the relay coil 110 is excited and the relay contact 106 is closed. When the emergency power-off switch 104 is opened, the relay coil 110 is de-energized and the relay contact 106 is opened.

Normally, as shown in FIG. 4, the emergency power-off switch 104 is closed, and the commercial AC input by the AC voltage-DC voltage converter 109 is converted into a predetermined DC voltage, and the converted predetermined DC voltage is converted. With relay coil 11
0 is energized to close the relay contact 106. In an emergency such as a fire, as shown in FIG. 5, when the emergency power-off switch 104 is manually opened, the DC voltage from the AC voltage-DC voltage converter 109 is applied to the relay coil 11.
0, and the relay coil 110 is de-energized, and the relay contact 106 is opened. Relay contact 106
Is open, the commercial AC is no longer supplied to the AC voltage-DC voltage converter 105, and the first and second DC voltages
The DC voltage converters 107 and 108 stop operating, the power is not supplied to the load 102, and the computer 101 stops operating.

[0007]

However, in such a conventional power supply device, since the commercial AC input when the emergency power supply of the computer is cut off is cut off, the AC voltage-the DC voltage is cut off. In order to provide a relay contact on the input side of the converter and operate a relay coil that opens and closes the relay contact, an AC voltage-DC voltage converter (UEPO power supply) was required as a dedicated power supply. For this reason, there was a problem that cost increased.

The present invention has been made in view of such a conventional problem, and has as its object to provide a power supply apparatus which does not require a power supply for emergency power-off and can reduce the cost. And

[0009]

In order to achieve this object, the present invention is configured as shown in FIG. The present invention
An AC voltage-DC voltage converter 11 for converting an input AC voltage into a predetermined DC voltage, and a first DC voltage as a main power supply for converting a DC voltage from the AC voltage-DC voltage converter 11 into a predetermined DC voltage. DC voltage converter 1
4, and a second DC voltage-DC voltage as an auxiliary power supply for converting the DC voltage from the AC voltage-DC voltage converter 11 into a predetermined DC voltage and supplying operating power to the first DC voltage-DC voltage converter In the power supply device having the converter 17 and turning off the power to the load 2 by operating the emergency power-off switch of the computer, by operating the emergency power-off switch 4, the second DC voltage-DC voltage Disconnecting means for disconnecting the supply of operating power from the converter to the first DC voltage-DC voltage converter is provided.

The disconnecting means 27 of the present invention comprises a relay contact 22 provided between the second DC voltage-DC voltage converter 17 and the first DC voltage-DC voltage converter 14,
A relay coil 25 that opens the relay contact 22 as non-excitation by opening the emergency power-off switch 4. According to the power supply apparatus of the present invention having such a configuration, the DC voltage-DC voltage converter 17 as the auxiliary power supply is disconnected by operating the emergency power supply disconnection switch 4, so that the This eliminates the need for an AC voltage-DC voltage converter as a dedicated power supply for operating a relay coil that opens a relay contact that disconnects an input, simplifies the circuit configuration, and reduces costs.

The disconnecting means 27 includes a relay contact 22 provided between the DC voltage-DC voltage converter 17 as an auxiliary power supply and the DC voltage-DC voltage converter 14 as a main power supply, and an emergency power disconnection switch 4. Is opened, the relay coil 22 opens the relay contact 22 for non-excitation, so that the number of parts does not increase and the configuration is simple.

[0012]

FIG. 2 and FIG. 3 are views showing an embodiment of the present invention. 2 and 3, reference numeral 1 denotes a computer for processing information, and the computer 1 has a load 2 such as a logic circuit or a fan. A power supply unit (PSU) 3 is provided in the computer 1, and the power supply unit 3 supplies power to the load 2.

The computer 1 is provided with an emergency power-off switch 4 for an emergency such as a fire. When the emergency power-off switch 4 is pressed, the power supply to the load 2 is cut off. ing. The computer 1 is provided with a line terminal 5, a neutral terminal 6, and a frame ground terminal 7, and the line terminal 8, the neutral terminal 9, and the frame connected to the line terminal 5, the neutral terminal 6, and the frame ground terminal 7, respectively. The ground terminals 10 are provided in the power supply device 3 respectively.

An AC voltage-DC voltage converter 11 is connected to the line terminal 8 and the neutral terminal 9. 100 to 1 for the AC voltage-DC voltage converter 11
A commercial AC of 20 V or a commercial AC of 200 to 240 V is input, and the AC voltage-DC voltage converter 11 converts the commercial AC into a DC, for example, a DC voltage of +370 V, and outputs it. Note that the frame ground terminal 10 is grounded in the power supply device 3.

A first DC voltage-DC voltage converter 14 as a main power supply is connected to the AC voltage-DC voltage converter 11 via power lines 12 and 13, and an auxiliary power supply DC-DC voltage converter 17 is connected. The second DC voltage-DC voltage converter 17 is connected to power lines 18 and 19.
Is connected to the control unit 14A of the first DC voltage-DC voltage converter 14 via the DC / DC voltage converter 14, receives DC voltage of, for example, + 370V from the AC voltage-DC voltage converter 11, converts the voltage to DC voltage of, for example, + 24V, and controls the voltage. Output to the unit 14A.

First DC voltage-DC voltage converter 14
Is connected to the load 2 via the power supply lines 20 and 21,
When the control unit 14A receives a DC voltage of, for example, +24 V as an operating power supply from the second DC voltage-DC voltage converter 17, it converts a DC voltage of, for example, +370 V from the AC voltage-DC voltage converter 11 to a DC voltage of, for example, +5 V. And outputs it to the load 2.

Second DC voltage-DC voltage converter 17
And control unit 1 of first DC voltage-DC voltage converter 14
4A is connected to a relay contact 22
And one end of a control line 23 is connected to the power supply line 18, and the other end of the control line 23 is connected to one end of the emergency power-off switch 4. The control line 23 is provided with a relay coil 25 for opening and closing the relay contact 22.
Is connected to a diode 26 in parallel. The diode 26 is provided to prevent the circuit from being damaged or malfunctioning due to the induced electromotive force of the relay coil 25.

The other end of the emergency power-off switch 4 is connected to one end of a control line 24. The other end of the control line 24 is connected to a second DC voltage-DC voltage converter 17 and a first DC voltage-DC voltage converter 14. Is connected to the power supply line 19 connected to the control unit 14A. When the emergency power-off switch 4 is closed, the DC voltage of, for example, +24 V is supplied from the second DC voltage-DC voltage converter 17 to the relay coil 2.
5 and is energized by the relay coil 25, and the relay contact 22 is closed.

When the emergency power-off switch 4 is opened, the DC voltage (+24 V) from the second DC voltage-DC voltage converter 17 is not supplied to the relay coil 25, and the relay coil 25 is de-energized and Contact 2
2 opens. The relay coil 25 and the relay contact 22 constitute a disconnecting means 27 for disconnecting power to the load 2 as a whole.

Next, the operation will be described. Normally, Figure 2
As shown in, the emergency power off switch 4 is closed,
From the second DC voltage-DC voltage converter 17, for example, +
Since a DC voltage of 24 V is supplied to the relay coil 25 and the relay coil 25 is excited, the relay contact 22 is closed.

100 to 120 V commercial AC or 200
~ 240V commercial AC is supplied to the AC voltage-DC voltage converter 11, and the AC voltage-DC voltage converter 11 is a 100-120V commercial AC or 200 ~ 2V.
The commercial AC of 40V is converted into a DC voltage, for example, a DC voltage of + 370V, and supplied to the first DC voltage-DC voltage converter 14 and the second DC voltage-DC voltage converter 17, respectively.

Second DC voltage-DC voltage converter 17
From the AC voltage-DC voltage converter 11, for example, +
Upon receiving a DC voltage of 370 V, the DC voltage is converted into a DC voltage of +24 V, for example, and the control unit 1 of the first DC voltage-DC voltage converter 14 is connected via the relay contact 22.
4A. When the first DC voltage-DC voltage converter 14 receives a DC voltage of +24 V as an operation power supply in the control unit 14A, the internal switching element is turned on, the transformer connected to the switching element is operated, and the AC voltage is changed. The DC voltage from the voltage-DC voltage converter 11 is converted into a predetermined DC voltage. Thus, the control unit 14
By the operation of A, DC voltage-AC voltage conversion is performed.

In this manner, the first DC voltage-DC voltage converter 14 converts the DC voltage of, for example, +370 V from the AC voltage-DC voltage converter 11 into a DC voltage of, for example, +5 V, under the control of the control unit 14A, and loads the DC voltage. Feed to 2. In an emergency such as when a fire occurs, as shown in FIG. 3, when the emergency power-off switch 4 is opened, the DC voltage (+2) from the second DC voltage-DC voltage converter 17 is released.
4V) does not flow through the relay coil 25, and the relay coil 25 is de-energized, so that the relay contact 22 opens.

Input commercial AC, for example, 100 to 120
The VAC or 200 to 240 VAC is converted into a DC voltage of, for example, +370 V by the AC voltage-DC voltage converter 11 and output to the first DC voltage-DC voltage converter 14 and the second DC voltage-DC voltage converter 17, respectively. , The second DC voltage-DC voltage converter 17
Is not supplied to the control unit 14A of the first DC voltage-DC voltage converter 14 because the relay contact 22 is open.

When the operating power (+24 V DC voltage) from the second DC voltage-DC voltage converter 17 is not supplied to the control unit 14A, the first DC voltage-DC voltage converter 14 constitutes the control unit 14A. The switching element is turned off, the transformer connected to the switching element stops operating, and the DC voltage-DC voltage conversion is stopped. As described above, when the control unit 14A does not operate, the DC voltage-DC voltage conversion is not performed.

Accordingly, the first DC voltage-DC voltage converter 14 stops operating, the power is not supplied to the load 2, and the computer 1 stops operating. In this way, when the emergency power supply is cut off, the power supply to the load 2 is immediately cut off by cutting off the second DC-DC converter 17 as the auxiliary power supply without cutting off the AC input. Unlike the related art, an AC-DC converter as an emergency power-off power supply is not required, so that the circuit configuration is simplified and the cost can be reduced.

[0027]

As described above, according to the present invention, the auxiliary power supply is cut off when the computer is emergencyly turned off, so that the first DC voltage for supplying power to the load can be reduced.
Since the operation of the DC voltage converter is stopped, a dedicated power supply for operating a relay coil for opening the relay contact of the AC input is not required, and the circuit configuration is simplified and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating the principle of the present invention.

FIG. 2 is an explanatory diagram of a normal state showing an embodiment of the present invention.

FIG. 3 is an explanatory diagram in an emergency showing an embodiment of the present invention.

FIG. 4 is an explanatory diagram of a conventional example at a normal time.

FIG. 5 is an explanatory diagram in an emergency showing a conventional example.

[Explanation of symbols]

1: Computer 2: Load 3: Power supply device 4: Emergency power-off switch 5, 8: Line terminal 6, 9: Neutral terminal 7, 10: Frame ground terminal 11: AC-DC converter 12, 13, 15, 16 , 18, 19, 20, 21: power supply line 14: first DC-DC converter 14A: control unit 17: second DC-DC converter 22: relay contact 23, 24: control line 25: relay coil 26: diode 27: cutting means

Claims (2)

[Claims] An AC voltage-DC voltage converter for converting an input AC voltage into a predetermined DC voltage, and a first power supply as a main power supply for converting a DC voltage from the AC voltage-DC voltage converter into a predetermined DC voltage. And a second auxiliary power supply as an auxiliary power supply for converting the DC voltage from the AC voltage to DC voltage converter to a predetermined DC voltage and supplying operating power to the first DC voltage to DC voltage converter. A power supply device having a DC voltage-to-DC voltage converter for turning off the power to the load by operating an emergency power-off switch of a computer, by operating the emergency power-off switch, Disconnecting means for disconnecting the supply of operating power from the DC voltage-DC voltage converter to the first DC voltage-DC voltage converter; Power supply. 2. The power supply device according to claim 1, wherein said disconnecting means includes a relay contact provided between said second DC voltage-DC voltage converter and said first DC voltage-DC voltage converter. And a relay coil that opens the relay contact as non-excited by opening the emergency power-off switch.