TWI586065B - Power distribution device with selectable output voltage - Google Patents

Description

Power distribution device with selectable output voltage

The present invention relates to a power distribution device, and more particularly to a power distribution device that can select an output voltage.

In the field of network services and data transmission, in order to provide more services or applications, the market demand for data centers consisting of multiple computers or servers is rapidly increasing. In order to solve the problems of power supply and distribution, the data center uses a power distribution unit (PDU) to allocate the power required by each computer or server. In fact, due to the different countries or regions set up in this data center, the power supply specifications provided to this data center may not be the same. Therefore, each power distribution unit is designed according to the power supply specifications of the country or region in which it is located, for example, according to the three-phase five-wire phase voltage of 120 volts or the line voltage of 208 volts in North America.

However, the existing power distribution unit has three types of output power supply modes such as providing only a fixed phase voltage, providing only a fixed line voltage, and providing a specific number of partial phase voltages and another specific number of line voltages. . Thus, for most computers using, for example, 120 volts and only one or two computers using 208 volts, the data center may have to use both power supply distribution units that provide fixed 120 volts and fixed 208 volts, or Part of the 120/208 volt type power distribution unit. In this case, it is feared that most of the 208 volt output power is not used, so that the output power of the power distribution unit is not efficient. Therefore, how to develop a power distribution unit that can improve the above-mentioned prior art is a problem that is urgently needed in the related art.

Accordingly, it is an object of the present invention to provide a power distribution device that selects an output voltage.

Therefore, the power distribution device of the present invention is adapted to receive three input voltages from a three-phase power source respectively corresponding to different phases, and includes at least one branch unit and at least one switch unit.

The at least one branch unit includes at least one socket and has a first input and a second input adapted to receive one of the input voltages.

The at least one switch unit includes a first switch having a first end adapted to receive the other of the input voltages, a second end adapted to electrically connect a neutral point, and a first end Electrically connecting the third end of the second input end of the at least one branch unit.

The first switch of the at least one switch unit is operable to selectively establish an electrical connection between the third end and one of the first and second ends such that the power distribution device selectively relates to the three One of a corresponding phase voltage of the phase power source and a corresponding line voltage is used as an output voltage, and the output voltage is output via the at least one socket of the at least one branch unit.

The effect of the present invention is that, by operating the at least one switch unit, the output voltage output by the power distribution device via the at least one socket is selectively one of the corresponding phase voltage and the corresponding line voltage. Therefore, not only can the load of different voltage requirements be satisfied, but also the output voltage can be changed according to the actual needs of the user, thereby improving the use efficiency of the power distribution device.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same reference numerals.

Referring to FIG. 1, FIG. 1 illustrates a first embodiment of a power distribution unit (PDU) of the present invention. The power distribution device includes three branch units 11, 12, 13, and three switch units. 21, 22, 23 (shown in Figure 2), three output voltage indicators 51, 52, 53, and a user input interface 6. The three branch units 11, 12, 13 respectively include a plurality of sockets.

The three output voltage indicators 51, 52, 53 respectively correspond to the three branch units 11, 12, 13 and indicate the output of each socket of each of the corresponding branch units 11, 12, 13 in a specific color. An output voltage, in this example, each output voltage indicator is an LED indicator. As shown in FIG. 1, for example, in the case of the output voltage indicator 51, when the output voltage of each socket of the branch unit 11 corresponding thereto is a high voltage, the LED indicator is displayed in red when the When the output voltage of each socket of the branch unit 11 is a low voltage, the LED indicator is displayed in green.

Referring to FIG. 2, the power distribution device is adapted to receive three input voltages from a three-phase power source 100 respectively corresponding to different phases. The three-phase power source 100 is a three-phase five-wire type and provides an input voltage Va and an input. The voltage Vb, an input voltage Vc, a neutral point n, and a ground GND, for convenience, FIG. 2 is only for the example of one of each of the branch units 11, 12, 13 as an example, There is a first input terminal adapted to receive one of the input voltages Va, Vb, Vc, a second input terminal, and a third input terminal adapted to electrically connect the ground GND of the three-phase power source 100. In the branch unit 11, the socket 111 of the branch unit 11 has the first input terminal 112 receiving the input voltage Va, the second input terminal 113, and the ground GND electrically connected to the three-phase power source 100. The third input 114.

The three switch units 21, 22, 23 respectively correspond to the three branch units 11, 12, 13 and respectively comprise a first switch 211, 221, 231, the first switch 211, 221, 231 having a suitable for receiving the a first end of the other of the input voltages Va, Vb, Vc, a second end adapted to electrically connect a neutral point n, and the branch unit 11, 12, 13 corresponding to an electrical connection The third end of the second input. As shown in FIG. 2, in the case of the switch unit 21, the switch unit 21 includes the first switch 211, and the first switch 211 has the first end 212 receiving the input voltage Vb, and the electrical connection is neutral. The second end 213 of the point n and the third end 214 of the second input end 113 electrically connected to the branch unit 11. In this embodiment, the first switch 211, 221, 231 of each of the switch units 21, 22, 23 is a manual mechanical switch, and the manual mechanical switch is a single pole double throw switch, a rotary switch and a dip switch One of them.

The output voltage selection technique of the power distribution device of the present invention is implemented such that the first switch 211, 221, 231 of each of the switch units 21, 22, 23 is operable to selectively establish the third end and the first end Electrical connection of one of the second ends, such that the power distribution device selectively uses one of a corresponding phase voltage and a corresponding line voltage of the three-phase power source 100 as the output voltage, and via each branch The sockets of units 11, 12, 13 output the output voltage. Taking the branch unit 11 and the switch unit 21 as an example, when the user operates the user input interface 6 of FIG. 1 to operate the first switch 211 of the switch unit 21 by way of toggle, rotation, etc., When the first switch 211 establishes the electrical connection between the third end 214 and the first end 212, the second input end 113 of the branching unit 11 receives the input voltage Vb, so that the input voltage of the socket 111 of the branching unit 11 For the corresponding line voltage Vab, for example, in North America, it is 208 volts. When the first switch 211 is operated to establish the electrical connection between the third end 214 and the second end 213, the input voltage output by the socket 111 of the branching unit 11 is the corresponding phase voltage Van, in North America. For example, it is 120 volts. Therefore, by the operation of the first switch 211, the socket 111 of the branch unit 11 can be changed to output one of the corresponding line voltage Vab and the corresponding phase voltage Van, and the output voltage indicator 51 is also The output voltage outputted by the socket 111 is the corresponding line voltage Vab (high voltage) or the corresponding phase voltage Van (low voltage), and the corresponding display is red or green.

Although the above description is only for the branch unit 11 and the switch unit 21, similarly, the socket of the branch unit 12 can output the corresponding line voltage Vbc and the corresponding phase via the operation of the first switch 221 of the switch unit 22. One of the voltages Vbn, and the socket of the branching unit 13 can also output one of the corresponding line voltage Vca and the corresponding phase voltage Vcn via the operation of the first switch 231 of the switching unit 23. Therefore, the output voltages output by the sockets of the three branching units 11, 12, and 13 may be different according to user selection. For example, the sockets of the three branching units 11, 12, and 13 output the corresponding line voltage Vab. , Vbc, Vca, or both output the corresponding phase voltages Van, Vbn, Vcn, or the sockets of the branching units 11, 12 output the corresponding line voltages Vab, Vbc, and the socket of the branching unit 13 outputs the corresponding phase voltage Vcn and many more.

It should be noted that although in the present embodiment, the number of the switch units 21, 22, 23 and the branch units 11, 12, 13 are respectively described by three, the number of the two is not limited thereto. And can be increased or decreased depending on actual demand, become one, two, four...etc. The number of sockets of each of the branch units 11, 12, and 13 is not limited to one, and may be expanded to two, three, four, etc. in parallel with the three-phase power source 100 according to actual needs. In addition, in the present embodiment, the corresponding line voltages Vab, Vbc, Vca, and the corresponding phase voltages Van, Vbn, and Vcn are 208 volts/120 volts, but they may also be based on the local power specifications of the region. Designed at 480 volts / 277 volts, or 400 volts / 230 volts, etc., without limitation.

Referring to FIG. 3 and FIG. 4, FIG. 3 illustrates a second embodiment of the power distribution device of the present invention. The difference between the second embodiment and the first embodiment is that each of the switch units 21, 22, The first switch 211, 221, 231 of the second switch 211, 221, 231 further has a first control terminal 215, 225, 235 for receiving a first drive signal S1, S1 ', S1", and according to the received first drive The signals S1, S1', S1" are used to establish an electrical connection between the third end of the first switch 211, 221, 231 and one of the first and second ends. As shown in FIG. 4, in the case of the switch unit 21, the first control end 215 of the first switch 211 of the switch unit 21 can be used to receive the first drive signal S1, and the third end 214 is established accordingly. Electrical connection with one of the first end 212 and the second end 213. In addition, the power distribution device further includes a processing unit 3 (shown in FIG. 5), a port 4, and a user input interface 6, and in the embodiment, the user input interface 6 includes a The mechanical keyboard 61 and a touch module 62 are an LCD touch module capable of displaying an input selection corresponding to the input signal. The following is explained one by one.

Referring to FIG. 5 and in conjunction with FIG. 4, the user input interface 6 is electrically coupled to the processing unit 3 and is operable to generate an input signal associated with the desired output voltage and output the input signal to the processing unit 3. The processing unit 3 is electrically connected to the first control ends 215, 225, and 235 of the first switches 211, 221, and 231, respectively, and is configured to generate the first driving signals S1, S1', and S1 according to the input signals. And the first driving signals S1, S1', S1'' are output to the first control terminals 215, 225, 235 of the first switches 21, 22, 23. In the case of the switch unit 21, the processing unit 3 is electrically connected to the first control terminal 215 of the first switch 211, and according to the input signal, the first driving signal S1 is outputted to the first control terminal 215. In detail, the processing unit 3 includes a controller 31 and a driver 32.

The controller 31 is electrically connected to the user input interface 6 to receive the input signal, and generates a first control signal C1, C1', C1'' according to the input signal, and the controller 31 is electrically connected to each branch. The first input and the second input of the socket of the unit 11, 12, 13 to detect voltage drops Vb1, Vb2 between the first and second inputs of the socket of each of the branch units 11, 12, 13 Vb3, and the controller 31 is electrically connected to the three output voltage indicators 51, 52, 53 to control each of the output voltage indicators 51, 52, 53 according to the detected voltage drops Vb1, Vb2, Vb3 This particular color indicates the output voltage output by the socket of the corresponding branching unit 11, 12, 13.

In the embodiment, the controller 31 is electrically connected to the three-phase power source 100 to detect the input of the input voltages Va, Vb, and Vc to learn all the corresponding line voltages from the three-phase power source 100. What are the options for the corresponding phase voltage, for example, in this example, all of the corresponding line voltage options are Vab, Vbc, Vca, all of the corresponding phase voltage options are Van, Vbn, Vcn, and the controller 31 can receive The input signal indicates, according to the input signal, that the desired output voltage is the corresponding line voltage Vab, Vbc, Vca or the corresponding phase voltages Van, Vbn, Vcn, to perform an analysis operation to generate the corresponding first control signal C1. , C1 ', C1'' to the driver 32.

The driver 32 is electrically connected to the first control terminals 215, 225, 235 of the first switch 211, 221, 231 and the controller 31, and receives the first control signals C1, C1', C1 from the controller 31. '', and in response to the first control signals C1, C1', C1'', generate the first driving signals S1, S1', S1" to output the first driving signals S1, S1', S1" The first control terminals 215, 225, 235 to the first switches 211, 221, 231.

Therefore, for example, when the user operates the user input interface 6, that is, operates the mechanical keyboard 61 and the touch module 62, the input signal is generated to indicate the branch unit 11 When the socket 111 outputs the corresponding line voltage Vab (that is, for example, 208 volts), the controller 31 receives the input signal and accordingly generates the first control signal C1 to the driver 32. The driver 32 generates the first driving signal S1 in response to the first control signal C1, and outputs the first driving signal S1 to the first control terminal 215 of the first switch 211 of the switching unit 21 to drive the first The three ends 214 are electrically connected to the first end 212. At this time, the controller 31 also detects a voltage drop Vb1 between the first input terminal 112 and the second input terminal 113 of the socket 111 of the branch unit 11 to learn that the socket 111 outputs the voltage according to the voltage drop Vb1. Corresponding to the line voltage Vab, the corresponding output voltage indicator 51 is controlled, that is, the LED indicator is displayed in red.

Referring to FIG. 6 and in conjunction with FIG. 4, the port 4 of the power distribution device is electrically coupled to the controller 31 and is adapted to connect an external device 200 that provides the input signal to transmit the input signal to the controller 31. The external device 200 is, for example, a computer that can be connected to the port 4 via a wireless connection or a wired connection to transmit the input signal to the controller 31 through the port 4. The user can, for example, pre-install a specific driver software distributed by the power distribution device manufacturer to the computer, so that the user can know the output voltage that can be provided by the sockets of the three branch units 11, 12, and 13 The input signal is generated by operating the computer to indicate that the output voltage output by the socket 111 of the branch unit 11 is the corresponding line voltage Vab, and the controller 31 controls the driver 32 to output the first driving signal. S1 to the first control end 215 to drive the third end 214 of the first switch 211 to be electrically connected to the first end 212. In this way, the user can not only operate the user input interface 6 of the power distribution device, but also select the output voltage at the remote computer, thereby increasing user convenience.

Although the above description is only for the branch unit 11 and the switch unit 21, similarly, as shown in FIG. 4, the first switch 221 of the switch unit 22 further has the first unit for receiving the first drive signal S1'. A control terminal 225, the first switch 231 of the switch unit 23 further has the first control terminal 235 for receiving the first drive signal S1". Moreover, as shown in FIG. 5, the driver 32 of the processing unit 3 is also electrically connected to the first control terminal 225 of the first switch 221 of the switch unit 22, and the first of the first switch 231 of the switch unit 23 The control terminal 235 generates an input signal to the controller 31 when the user operates according to any one of the mechanical keyboard 61, the LCD touch module 62 and the external device 200 according to the desired output voltage. The controller 31 generates the control signals C1 ′, C1 ′′ respectively to control the driver 32 to generate the first driving signals S1 ′, S1 ′′ respectively, and output to the first control terminals 225 and 235 correspondingly. Through the automatic control of the processing unit 3 of the power distribution device, the user can more flexibly and conveniently select the required output voltage through manual, touch, remote computer operation and the like.

Referring to FIG. 7, FIG. 7 is a third embodiment of the power distribution device of the present invention. The difference from the second embodiment is that the first switches 211, 221, and 231 of each of the switch units 21, 22, and 23 are one. The relay switches, and each of the switch units 21, 22, 23 further includes a second relay switch 218, 228, 238 and a third switch 216, 226, 236 connected in parallel. In this embodiment, the third switches 216, 226, and 236 are implemented by two step-controlled rectifiers, but in other implementations, the two metal oxide semiconductor field effect transistors may be implemented. .

The third switch 216, 226, 236 of each of the switching units 21, 22, 23 is adapted to receive the one of the input voltages Va, Vb, Vc and electrically connect the sockets of the branching units 11, 12, 13 corresponding thereto a first input end, and the third switch 216, 226, 236 respectively has a third control end 217, 227, 237 for receiving a third driving signal S3, S3', S3", and the third The switches 216, 226, and 236 are respectively turned on in response to the third driving signals S3, S3', and S3'' after receiving the one of the input voltages Va, Vb, and Vc. Taking the third switch 216 of the switch unit 21 as an example, the third switch 216 receives the input voltage Va and is electrically connected to the first input end 112 of the socket 111 of the branch unit 11 and has the third input terminal for receiving The third control terminal 217 of the driving signal S3 is turned on in response to the third driving signal S3 being received by the input voltage Va.

The second relay switch 218, 228, 238 is adapted to receive the first input of the socket of the branch unit 11, 12, 13 corresponding to the one of the input voltages Va, Vb, Vc and the electrical connection The second relay switches 218, 228, 238 respectively have a second control terminal 219, 229, 239 for receiving a second drive signal S2, S2', S2", and the second relay switch 218, 228, 238 It is in response to the second driving signal S2, S2', S2'' until the corresponding outlet outputs the output voltage to remain conductive. In the second relay switch 218 of the switch unit 21, the second relay switch 218 is connected in parallel with the third switch 216, receives the input voltage Va and is electrically connected to the first input end 112 of the socket 111 of the branch unit 11. And having the second control terminal 219 for receiving the second driving signal S2, and the second relay switch 218 is turned on in response to the second driving signal S2 until the outlet voltage is outputted by the socket 111.

Referring to FIG. 8 , the controller 31 is adapted to electrically connect the three-phase power supply 100 to detect the input of the input voltages Va, Vb, and Vc to obtain the corresponding line voltages Vab, Vbc, Vca and the corresponding phase voltage Van respectively. Vbn, Vcn, and the controller 31 is also electrically connected to the first input end and the second input end of the socket of each branch unit 11, 12, 13 to detect the socket of each branch unit 11, 12, 13 The voltage drop Vb1, Vb2, Vb3 between the first input terminal and the second input terminal generates the first control signals C1, C1', C1'' according to the inputs of the input voltages Va, Vb, Vc, Then, third control signals C3, C3', C3'' are generated, and a second control signal C2, C2', C2'' is generated according to the detection results of the voltage drops Vb1, Vb2, Vb3.

The driver 32 is also electrically connected to the second control terminals 219, 229, 239 of the second relay switches 218, 228, 238 and the third control terminals 217, 227, 237 of the third switches 216, 226, 236, and Receiving the second control signals C2, C2', C2" and the third control signals C3, C3', C3" from the controller 31 to respectively according to the second control signals C2, C2', C2'' And generating, by the third control signals C3, C3', C3'', the second driving signals S2, S2', S2" and the third driving signals S3, S3', S3", and the second driving signal S2 And S3', S2'' and the third driving signals S3, S3', S3" are respectively output to the second control terminals 219, 229, 239 of the second relay switches 218, 228, 238 and the third switch The third control terminals 217, 227, 237 of 216, 226, 236.

Referring to FIG. 9 and FIG. 8 , for example, when the user operates the user input interface 6 , the input signal is generated to indicate that the socket 111 of the branch unit 11 outputs the corresponding line voltage Vab (that is, for example, 208 volts, the controller 31 receives the input signal and generates an corresponding first control signal C1 to the driver 32 according to an analysis operation, and the driver 32 generates the first driving signal S1 in response to the first control signal C1. The first control terminal 215 of the first switch 211 is output to drive the third terminal 214 to be electrically connected to the first terminal 212. Moreover, the controller 31 generates the first control signal when detecting the input of the input voltage Va, and delays a period of time (ie, time of flight) to generate the third control signal C3, and the driver 32 responds to The third control signal generates the third driving signal S3, and is input to the third control terminal 217 of the third switch 216, so that the third switch 216 remains conductive in response to the third driving signal. At this time, the first input terminal 112 of the socket 111 of the branching unit 11 receives the input voltage Va, and the second input terminal 113 receives the input voltage Vb to generate the voltage drop Vb1, so that the socket 111 outputs the corresponding line. The voltage Vab is used as the output voltage.

The controller 31 then generates the second control signal C2 when detecting the voltage drop Vb1 of the first input terminal 112 and the second input terminal 113. The driver 32 receives the second control signal C2, and generates the second driving signal S2, and outputs the second driving signal S2 to the second control terminal 219 of the second relay switch 218, so that the second relay switch 218 responds to the second driving Signal S2 remains on.

In this way, by using the third switch 216 as a static switch, the transient switching moment of the third end 214 and the first end 212 of the first switch 211 (relay switch) can be avoided due to sparking or The arc is pulled, causing the first switch 211 (relay switch) to stick to the end point and cause an abnormality. Moreover, the third switch 216 uses two butt-controlled rectifier rectifiers (or two docked metal-oxide-semiconductor field-effect transistors) to ensure that the input voltage Va can have either a positive half-cycle or a negative half-cycle signal. One remains on. In addition, the second relay switch 218 remains conductive after the outlet 111 outputs the corresponding line voltage Vab, and receives the input voltage Va to the first input terminal 112 of the socket 111, thereby replacing the controlled rectifier to avoid such a semiconductor switch. The conduction energy loss that occurs.

Referring to FIG. 10, FIG. 10 is a modification of the third embodiment. The difference from the third embodiment is that the third switch 216, 226, 236 is responsive to the third driving signal S3, S3', S3. '' Further changes from conduction to non-conduction after the second relay switches 218, 228, 238 are turned on. In the following example, the third switch 216 is converted from non-conducting to non-conducting after the second driving signal S3 is turned on, thereby saving energy consumed by driving the third switch 216. More energy efficient.

It should be noted that although the above description is only for the branch unit 11 and the switch unit 21, similarly, the switch unit 22 further includes the third switch 226, and the second relay switch 228, and the third switch 226 The third control terminal 227 is configured to receive the third driving signal S3 ′, and the second relay switch 228 has the second control terminal 229 for receiving the second driving signal S2 ′. The switch unit 23 further includes the third switch 236 and the second relay switch 238, and the third switch 236 has the third control end 237 for receiving the third drive signal S3 ′′, the second The relay switch 238 has the second control terminal 239 for receiving the second drive signal S2".

Thereby, when the controller 31 receives the input signal indicating the desired output voltage, the driver 32 can control the third driving signal S3' when it controls the switching of the first switch 221, 231. And the third control terminals 227, 237 of the third switch 226, 236 are turned on to prevent the first switch 221, 231 from being caused by the transient moment of the switching. Sparks, arcs, etc. Then, until the corresponding outlet outputs the output voltage, the controller 31 controls the driver 32 to send the second driving signal S2', S2" to the second control end 229 of the second relay switch 228, 238, 239, the second relay switches 228, 238 are turned on to further avoid the conduction energy loss of the semiconductor switch.

In summary, the power distribution device of the present invention is added to the switch units 21, 22, 23, and the first switch 211, 221, 231 of each of the switch units 21, 22, 23 causes the power distribution device to be The output voltage outputted by the corresponding socket of each branch unit 11, 12, 13 is selectively one of the corresponding phase voltages Van, Vbn, Vcn and the corresponding line voltages Vab, Vbc, Vca, not only The equipment can meet the requirements of different voltage requirements, and the same power distribution device can meet the requirements of different equipments, can reduce the number of power distribution devices, and is closer to the actual needs of users, thereby improving the use efficiency of the power distribution device. In addition, the automatic control function of the first switch 211, 221, 231 is achieved by adding the processing unit 3, and the user can also manually or touch the user input interface 6, or use the computer to transmit the connection. For remote operation, etc., it increases the flexibility and convenience of use. Furthermore, in combination with the use of the third switches 216, 226, 236 and the second relay switches 218, 228, 238, it is possible to reduce the possibility of sparking and arcing at the moment of transient switching of the first switches 211, 221, and 231. Abnormal phenomena, thereby improving the stability of the operation of the power distribution device, can indeed achieve the object of the present invention.

However, the above is only the embodiment of the present invention, and the scope of the invention is not limited thereto, and all the equivalent equivalent changes and modifications according to the scope of the patent application and the patent specification of the present invention are still The scope of the invention is covered.

11‧‧‧Branch unit
6‧‧‧User input interface
111‧‧‧ socket
61‧‧‧Mechanical keyboard
112‧‧‧ first input
62‧‧‧Touch Module
113‧‧‧second input
100‧‧‧Three-phase power supply
114‧‧‧ third input
200‧‧‧External devices
12‧‧‧ branch unit
Va‧‧‧ input voltage
13‧‧‧Branch unit
Vb‧‧‧ input voltage
21‧‧‧Switch unit
Vc‧‧‧ input voltage
211‧‧‧ first switch
n‧‧‧Neutral point
212‧‧‧ first end
GND‧‧‧
213‧‧‧ second end
Vb1‧‧‧ voltage drop
214‧‧‧ third end
Vb2‧‧‧ voltage drop
215‧‧‧First control terminal
Vb3‧‧‧ voltage drop
216‧‧‧ third switch
Vab‧‧‧ line voltage
217‧‧‧ third control end
Vbc‧‧‧ line voltage
218‧‧‧Second relay switch
Vca‧‧‧ line voltage
219‧‧‧second control end
Van‧‧‧ phase voltage
22‧‧‧Switch unit
Vbn‧‧‧ phase voltage
221‧‧‧First switch
Vcn‧‧‧ phase voltage
225‧‧‧First control terminal
C1‧‧‧ first control signal
226‧‧‧ third switch
C1'‧‧‧ first control signal
227‧‧‧ third control end
C1''‧‧‧ first control signal
228‧‧‧Second relay switch
C2‧‧‧second control signal
229‧‧‧second control terminal
C2'‧‧‧ second control signal
23‧‧‧Switch unit
C2''‧‧‧ second control signal
231‧‧‧First switch
C3‧‧‧ third control signal
235‧‧‧ third control end
C3'‧‧‧ third control signal
236‧‧‧third switch
C3''‧‧‧ third control signal
237‧‧‧ third control end
S1‧‧‧First drive signal
238‧‧‧Second relay switch
S1'‧‧‧ first drive signal
239‧‧‧second control end
S1''‧‧‧ first drive signal
3‧‧‧Processing unit
S2‧‧‧second drive signal
31‧‧‧ Controller
S2'‧‧‧second drive signal
32‧‧‧ drive
S2''‧‧‧second drive signal
4‧‧‧Connected
S3‧‧‧ third drive signal
51‧‧‧Output voltage indicator
S3'‧‧‧ third drive signal
52‧‧‧Output voltage indicator
S3''‧‧‧ third drive signal
53‧‧‧Output voltage indicator

Other features and advantages of the present invention will be apparent from the embodiments of the present invention, wherein: Figure 1 is a schematic view showing a first embodiment of a power distribution device of the present invention; 1 is a schematic view showing the first embodiment; FIG. 3 is a schematic view showing a second embodiment of a power distribution device according to the present invention; FIG. 4 is a schematic view, and FIG. Figure 5 is a block diagram, the second embodiment is illustrated in Figure 4; Figure 6 is a block diagram, and Figure 4 is a schematic view of the second embodiment; Figure 7 is a schematic view of a power distribution device of the present invention FIG. 8 is a block diagram, and FIG. 9 is a timing chart. FIG. 9 is a timing chart showing the driving outputs of a processing unit of the third embodiment with reference to FIG. 7 and FIG. The timing relationship between the signal and the input voltage and the output voltage; and FIG. 10 is a timing diagram, and the timing relationship between the driving signals outputted by a processing unit of the third embodiment and the input voltage and the output voltage is described with reference to FIG. 7 and FIG. .

100‧‧‧Three-phase power supply

11‧‧‧Branch unit

111‧‧‧ socket

112‧‧‧ first input

113‧‧‧second input

114‧‧‧ third input

12‧‧‧ branch unit

13‧‧‧Branch unit

21‧‧‧Switch unit

211‧‧‧ first switch

212‧‧‧ first end

213‧‧‧ second end

214‧‧‧ third end

22‧‧‧Switch unit

23‧‧‧Switch unit

Va‧‧‧ input voltage

Vb‧‧‧ input voltage

Vc‧‧‧ input voltage

n‧‧‧Neutral point

GND‧‧‧

Claims (15)

A power distribution device capable of selecting an output voltage, adapted to receive three input voltages corresponding to different phases from a three-phase power source, and comprising: at least one branch unit, including at least one socket, and having a suitable for receiving the a first input end and a second input end of the input voltage; and at least one switch unit comprising a first switch having a first switch adapted to receive the other of the input voltages a first end, a second end adapted to electrically connect to a neutral point, and a third end electrically connected to the second input end of the at least one branch unit; wherein the first switch of the at least one switch unit is Operating to selectively establish an electrical connection between the third end and one of the first and second ends such that the power distribution device selectively correlates a corresponding phase voltage associated with the three phase power supply with a corresponding line voltage One of the outputs is an output voltage and the output voltage is output via the at least one socket of the at least one branch unit. The power distribution device of claim 1, wherein the first switch is a manual mechanical switch. The power distribution device of claim 2, wherein the manual mechanical switch is one of a single pole double throw switch, a rotary switch and a dip switch. The power distribution device of claim 1, wherein the first switch further has a first control end for receiving a first driving signal, and establishing the third end according to the received first driving signal And the power distribution device further includes: a processing unit, at least electrically connecting the first control end of the first switch, and assembling according to a related The input signal for outputting a voltage generates at least the first driving signal and outputs the first driving signal to the first control end of the first switch. The power distribution device of claim 4, wherein the processing unit comprises a controller for receiving the input signal and generating at least a first control signal according to the input signal, and a driver electrically connecting at least the first The first control end of the switch and the controller receive the first control signal from the controller, generate the first driving signal in response to the first control signal, and output the first driving signal to the The first control end of the first switch. The power distribution device of claim 5, further comprising: a port electrically coupled to the controller and adapted to connect to an external device providing the input signal to transmit the input signal to the controller. The power distribution device of claim 5, further comprising: a user input interface electrically coupled to the controller and operative to generate the input signal and output the input signal to the controller. The power distribution device of claim 7, wherein the user input interface comprises at least one of a mechanical keyboard and a touch module. The power distribution device of claim 8, wherein the touch module is an LCD touch module capable of displaying an input selection corresponding to the input signal. The power distribution device of claim 5, wherein the controller is further electrically connected to the first and second inputs of the at least one branch unit to detect the first and second inputs of the at least one branch unit The voltage distribution device further includes: at least one output voltage indicator electrically connected to and controlled by the controller of the processing unit, such that the controller controls the at least one according to the detected voltage drop The output voltage indicator indicates the output voltage output by the at least one socket of the at least one branch unit. The power distribution device of claim 10, wherein the at least one output voltage indicator is an LED indicator and the output voltage is indicated by a particular color. The power distribution device of claim 5, wherein: the first switch is a relay switch; the at least one switch unit further includes a second relay switch and a third switch connected in parallel, the second relay switch The third switch is adapted to receive the one of the input voltages and electrically connect the first input end of the at least one branch unit, the second relay switch has a second control end for receiving a second driving signal, The third switch has a third control terminal for receiving a third driving signal, and the third switch is kept in conduction after receiving the one of the input voltages in response to the third driving signal, the third switch The second relay switch is responsive to the second drive signal until the outlet outputs the output voltage to remain conductive; the controller is adapted to electrically connect the three-phase power supply to detect the input of the input voltage, and further electrically connect the at least one The first and second inputs of the at least one socket of the branch unit to detect a voltage drop between the first and second inputs of the at least one socket of the at least one branch unit, and Generating the first control signal and a third control signal according to the input of the input voltage, and generating a second control signal according to the detection result of the voltage drop; and the driver is further electrically connected to the second relay switch a second control end and the third control end of the third switch, and receiving the second and third control signals from the controller to generate the second and third driving signals according to the second and third control signals, respectively And outputting the second and third driving signals to the second control end of the second relay switch and the third control end of the third switch, respectively. The power distribution device of claim 12, wherein the third switch is responsive to the third drive signal to transition from conductive to non-conductive after the second relay switch is turned on. The power distribution device of claim 12, wherein the third switch comprises two step-controlled rectifiers. The power distribution device of claim 12, wherein the third switch comprises two metal oxide semiconductor field effect transistors.