JPH0783552B2 - Power supply - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a power supply device configured to receive power from either a three-phase three-wire power source or a three-phase four-wire power source, In particular, the present invention relates to a power supply device suitable for preventing an erroneous selection of a power source.

[Background of the Invention]

There are the following methods for finding electronic devices that match the world's power source situation.

(1) When the power consumption of the electronic device is small, the three-phase three-wire system, that is, the line power when the line voltage is 200 VAC to 230 VAC, and the three-phase four-line system are created by making it operate in a single phase.
When the line type, that is, the line voltage is 380 VAC to 415 VAC, the power between the line and the neutral is received.

(2) When the power consumption of the electronic device is large, the electronic device is designed to operate in three phases, and by modifying and switching some of the units in the device, a three-phase three-wire three-phase three-phase system is provided.
Make it possible to receive it even with a wire system.

Among these, in the case of an electronic device that operates in three phases, the AC load in the device, such as a stabilized DC power supply unit and a cooling fan, generally operates in a 200 VAC system. If the selection of the switching unit that plays the role of switching the connection in the device depending on whether it is a 3-phase 4-wire type makes an error such as receiving a 3-phase 4-wire type power source while the 3-phase 3-wire type is being used, This causes the inconvenience of destroying the AC load.

[Object of the Invention]

An object of the present invention is to provide a power supply device capable of preventing the destruction of the electronic device caused by the type of power source received and the connection mismatch in the electronic device.

[Outline of Invention]

In order to achieve such an object, the present invention provides a synchronization unit for checking whether or not a combination is matched with one or more existing wire connection switching units, using a unit that is changed in the power supply device as a key, depending on the type of power source received. It is characterized in that the electronic device can be turned on only when the change unit and the connection of the switching unit form a serial net.

Example of Invention

 An embodiment of the present invention will be described below with reference to FIG.

First, the device of the present invention is mainly composed of the following three components. That is, the power input unit 1 or 3 for the three-phase three-wire system
A phase 4-wire type power input unit 11, an AC power ON / OFF unit 21, and a power-on control unit 31. The input unit 1 and the input unit 11 are
They are used interchangeably depending on the type of power source received.

Further, among the above-mentioned components, 2 and 12 are input terminal units, 3 and 13 that serve to receive respective power sources in the electronic device.
Are the output plugs of the three-phase three-wire power supply input unit 1 and the three-phase four-wire power supply input unit 11, respectively, and 4 and 14 are the power supply discrimination plugs that are the keys for discriminating the type of the power source, respectively. Part, 22
Is an input plug portion of the AC power on / off portion 21, to which a cable from either the output plug portion 3 or 13 is connected. Also, 23 is the AC power on / off unit 21.
Is an output plug unit, which supplies AC power to a load, 24 is a relay plug unit to which a cable of only one of the power source discrimination plug unit 4 and 14 is connected, and 25 is a switching plug unit, It makes it possible to switch the AC power supplied to the load depending on the type of source, and to synchronize with the three-phase three-wire power supply input section 1 or the three-phase four-wire power supply input section 11. is there.

26 is a relay plug unit that transmits signals of the relay plug unit 24 and the switching plug unit 25 to the power-on control unit 31, and 27 is an ON-OF of AC power.
The F switch, 28 operates at an interphase voltage regardless of the type of power source received, and is a stabilizing auxiliary power supply unit for supplying the DC voltage E to the power-on control unit 31 via the relay plug unit 26,
29 and 30 are switching adapters, one of which is selectively used according to the type of power source, and are connected to the switching connector 25. When these adapters 29 and 30 are in the correct combination, they form a serial net with the power source discrimination plug portions 4 and 14, respectively. The plug 29 is of the three-phase, three-wire type.
30 is used for 3 phase 4 wire type respectively. Reference numeral 32 is a relay plug portion that receives the relay plug portion 26, 33 is a NAND gate circuit that receives a synchronization signal with the power supply discrimination plug portion 4 or the switching adapter 29 or 30, 34 is a power-on command switch, 35 is an invertor circuit, 36 Receives the power-on command switch 34, the NAND gate circuit and the output, and sends the ON command signal S to the ON-OFF switch 27.
It is an AND gate circuit that operates to output 1.

In the above configuration, the power supply unit is now equipped with the 3-phase 4-wire type input section 11, and the switching adapter 30 is connected to the switching plug section 25 to receive a 3-phase 4-wire type power source. The auxiliary power supply 28 is activated to supply the DC voltage E to the power-on control unit 31. At this time, the input A1 of the NAND gate circuit 33 is open or high, the input A2 is in the form of a serial net and becomes the ground potential or low, and the output of the NAND gate circuit 33 becomes high and is transmitted to the AND gate circuit 36. When the power-on command switch 34 is turned on here, the inverter circuit
The input of 35 becomes low, the output S1 of the AND gate circuit 36 appears, and this S1 turns on the ON-OFF switch 27,
The normal single-phase electric power of the output plug unit 23 glue UN, VN, W-N is supplied to the load.

If a wrong selection is made and 29 is connected instead of the changeover adapter 30, both inputs A1 and A2 of the NAND gate circuit 33 become high and the output becomes low to be transmitted to the AND gate circuit 36. Is turned on, the output of the AND gate circuit 36 is not output, and the ON-OFF switch 27 is not operated.

Next, the 3-phase 3-wire input unit 1 is mounted on the power supply device,
A normal switching adapter when receiving a three-phase three-wire power source
The same operation as described above is performed when the switch adapter 30 is connected or when the switching adapter 30 is accidentally connected.

[Effects of the Invention] According to the power supply device of the present invention, both the three-phase three-wire power source and the three-phase four-wire power source can be received by changing some units in the power supply device and changing the connection of the switching unit. In an electronic device that can be operated as a product, even if the wiring of the switching unit is not expected, it is possible to prevent the electronic device from being destroyed, and the malfunction is detected by a method that is simple and inexpensive. Therefore, there is an effect that safety can be secured.

[Brief description of drawings]

FIG. 1 is a block diagram of the device of the present invention. 1 ... 3-phase 3-wire type input section, 11 ... 3-phase 4-wire type input section, 4, 14 ... Discrimination plug section, 21 ... AC power on / off section, 25 ... Switching plug Part, 27 ... ON / OFF switch, 2
9,30 …… Switching adapter, 31 …… Power-on control unit, 33 ……
Nand gate circuit, 34 ... power-on instruction switch, 36 ...
… And gate circuit.

Claims (1)

[Claims] 1. A power supply device that receives different types of power supplies and sends them to a load side through a switch, and a determination connector unit having a determination unit depending on the type of power supply to be received, and a type of power supply to be received. A control for switching the connection in a dependent manner and monitoring the connection of the switching connection unit that forms a serial net with the determination connection unit and the connection of the serial net, and turning on the switch only when a predetermined serial net is formed. A power supply device comprising: