JP6886848B2 - Power supply and control device - Google Patents

Description

The present invention relates to a power supply device and a control device.

In recent years, there is known a power supply device capable of switching between an inverter power supply that supplies AC power converted by an inverter unit and a bypass power supply that supplies AC power supplied from the outside (see, for example, Patent Document 1). ). In such a power supply device, for example, an open / close switch that mechanically opens and closes contacts such as a relay and a semiconductor switch connected in parallel to the open / close switch are used to switch between inverter power supply and bypass power supply. ..

Japanese Unexamined Patent Publication No. 2016-49011

By the way, in the above-mentioned conventional power supply device, since it takes time to make the open / close switch conductive, semiconductor switches that become conductive in a shorter time than the open / close switch are connected and used in parallel. Therefore, for example, when switching from bypass power supply to inverter power supply, the conventional power supply device needs to be provided with a semiconductor switch for inverter power supply so that the output of AC power is not interrupted.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a power supply device and a control device capable of simplifying the configuration while appropriately switching from bypass power supply to inverter power supply. It is in.

In order to solve the above problem, one aspect of the present invention is to use a first switch for conducting a bypass power supply line to which AC power is supplied from the outside and an output line of an AC output, and the supplied DC power to be AC power. An inverter unit that converts to the above, a second switch that mechanically opens and closes the contacts, and a second switch that conducts the output line of the inverter unit and the output line of the AC output, and the AC output from the bypass feeding line. When switching from the bypass power supply that supplies power to the output line of the above to the inverter power supply that supplies power to the output line of the AC output from the AC power converted by the inverter unit, the second switch is conducted in a conductive state. Before the inverter unit outputs AC power, a voltage is supplied to the conversion unit that converts DC power to AC power, and the period for synchronization processing with the AC power by the bypass power supply elapses. after output preparation of the inverter unit is completed is state, and the first switch non-conductive, and a control unit to start the conversion of the inverter unit, wherein the control unit, the second Before making the switch conductive, a command to start the preparation for the operation of the inverter unit, a command to supply a voltage to the conversion unit, and to start a synchronization process with the AC power by the bypass power supply is transmitted. , Information output indicating that the AC signal output from the bypass feeding line has reached the output line inside the inverter section, and is connected between the output line inside the inverter section and the bypass feeding line. The power supply device is characterized in that it is determined that the output preparation of the inverter unit is completed based on the information output that outputs the state of the output relay switch.
Further, one aspect of the present invention includes a first switch that conducts a bypass power supply line to which AC power is supplied from the outside and an AC output output line, and an inverter unit that converts the supplied DC power into AC power. , An open / close switch that mechanically opens and closes the contacts, a second switch that conducts the output line of the inverter unit and the output line of the AC output, and power is supplied from the bypass power supply line to the output line of the AC output. When switching from bypass power supply to inverter power supply that supplies AC power converted by the inverter section to the output line of the AC output, the second switch is made conductive while the first switch is conducting. After the output preparation of the inverter unit is completed, the first switch is brought into a non-conducting state, and a control unit for starting conversion of the inverter unit is provided. Before outputting the AC power, a voltage is supplied to the conversion unit that converts the DC power into the AC power, and the synchronization process with the AC power output from the bypass power supply line is included, and the output preparation of the inverter unit is included. After completion, the power supply device is characterized in that the period for the synchronous processing with the AC power by the bypass power supply has elapsed.

Further, one aspect of the present invention includes a third switch, which is an open / close switch that is connected in parallel to the first switch and mechanically opens and closes contacts in the power supply device. The control unit is a semiconductor switch, and when switching from the bypass power supply to the inverter power supply, the first switch is in a conductive state and the third switch is in a non-conducting state. The second switch is brought into a conductive state, and after the output preparation of the inverter section is completed, the first switch is brought into a non-conducting state to start conversion of the inverter section.

Further, in one aspect of the present invention, in the power supply device, when the control unit switches from the bypass power supply to the inverter power supply, the first switch is made conductive by the bypass power supply. The second switch is brought into a conductive state, and after the output preparation of the inverter section is completed, the first switch is brought into a non-conducting state to start conversion of the inverter section.

Further, one aspect of the present invention includes a first switch that conducts a bypass power supply line to which AC power is supplied from the outside and an AC output output line, and an inverter unit that converts the supplied DC power into AC power. An open / close switch that mechanically opens and closes contacts, and is a control device that controls a power supply device including a second switch that conducts an output line of the inverter unit and an output line of the AC output. When switching from the bypass power supply that supplies power from the bypass power supply line to the output line of the AC output to the inverter power supply that supplies power to the output line of the AC output from the AC power converted by the inverter unit, the first switch is conducted. In this state, the second switch is brought into a conductive state, and before the inverter unit outputs the AC power, a voltage is supplied to the conversion unit that converts the DC power into the AC power, and the AC power generated by the bypass power supply is used. after output preparation of the inverter unit is completed a period of synchronization component of a state elapses, and the first switch non-conductive, and a control unit to start the conversion of the inverter, the control The unit is a command to start the preparation for the operation of the inverter unit before the second switch is brought into the conductive state, and supplies a voltage to the conversion unit and synchronizes with the AC power by the bypass power supply. Is an information output indicating that the AC signal output from the bypass feeding line has reached the output line inside the inverter unit by transmitting a command to start the inverter unit, and the output line inside the inverter unit and the bypass. The control device is characterized in that it determines that the output preparation of the inverter unit is completed based on the information output that outputs the state of the output relay switch connected to the power supply line.
Further, one aspect of the present invention includes a first switch that conducts a bypass power supply line to which AC power is supplied from the outside and an AC output output line, and an inverter unit that converts the supplied DC power into AC power. A control device that controls a power supply device including an open / close switch that mechanically opens and closes contacts, and a second switch that conducts an output line of the inverter unit and an output line of the AC output. When switching from the bypass power supply that supplies power from the bypass power supply line to the output line of the AC output to the inverter power supply that supplies power to the output line of the AC output from the AC power converted by the inverter unit, the first switch is made conductive. In this state, the second switch is brought into a conductive state, and after the output preparation of the inverter section is completed, the first switch is brought into a non-conducting state and a control unit for starting conversion of the inverter section is provided. To prepare the output of the inverter unit, before outputting the AC power in the inverter unit, a voltage is supplied to the conversion unit that converts the DC power into the AC power, and the voltage is synchronized with the AC power output from the bypass power supply line. The control device includes the processing, and after the output preparation of the inverter unit is completed, the control device is in a state in which the period for the synchronization processing with the AC power by the bypass power supply has elapsed.

According to the present invention, when the control unit switches from the bypass feed line to the inverter power supply, the output line of the inverter unit and the output line of the inverter unit are connected with the first switch that conducts the bypass feed line and the AC output output line. The second switch that conducts with the output line of the AC output is made conductive. Then, after the output preparation of the inverter unit is completed, the control unit puts the first switch in the non-conducting state and starts the conversion of the inverter unit. As a result, the power supply device starts the conversion of the inverter section after the output preparation of the inverter section, which can confirm that the second switch is in the conductive state, is completed, so that the output of the AC power is not interrupted. The semiconductor switch for power supply to the inverter can be deleted. Therefore, the configuration of the power supply device can be simplified while appropriately switching from bypass power supply to inverter power supply.

It is a functional block diagram which shows an example of the power supply device by 1st Embodiment. It is a functional block diagram which shows an example of the inverter part by 1st Embodiment. It is a flowchart which shows an example of the switching process of the power supply device by 1st Embodiment. It is a timing chart which shows an example of the switching process of the power supply device by 1st Embodiment. It is a functional block diagram which shows an example of the power supply device by 2nd Embodiment. It is a flowchart which shows an example of the switching process of the power supply device by 2nd Embodiment. It is a timing chart which shows an example of the switching process of the power supply device by 2nd Embodiment.

Hereinafter, the power supply device and the control device according to the embodiment of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a functional block diagram showing an example of the power supply device 1 according to the first embodiment.
As shown in FIG. 1, the power supply device 1 includes a control device 10, an open / close switch 11, a semiconductor switch 12, an output switch 13, and an inverter unit 20. The power supply device 1 is a power supply device capable of switching between AC power obtained by converting the DC power supplied from the DC power supply 3 by the inverter unit 20 and AC power supplied from the commercial power supply 2. Here, the commercial power supply 2 is, for example, an AC power supply of 100 V (volt).

In the following description, supplying the AC power supplied from the commercial power supply 2 to the output line of the power supply device 1 is called bypass power supply, and the AC power converted by the inverter unit 20 is used as the output line of the power supply device 1. Supplying is called inverter power supply. Further, the power supply line to which AC power is supplied from the commercial power supply 2 (external) is called a bypass feed line L1, and the AC output output line which is the output line of the power supply device 1 is called an AC output line L3.

The control device 10 is a device that controls the power supply device 1 and includes a control unit 30. The control device 10 controls, for example, the operation of the inverter unit 20 and controls switching between bypass power supply and inverter power supply. The details of the control unit 30 will be described later.

The open / close switch 11 (an example of a third switch) is, for example, a switch that mechanically opens and closes contacts such as a relay switch and a switch, and is a switch for bypass power supply. The open / close switch 11 is connected between the bypass feed line L1 to which AC power is supplied from the commercial power supply 2 (outside) and the AC output line L3. The open / close switch 11 is switched between an off state (non-conducting state) and an on state (conducting state) based on a control signal supplied from the control unit 30. Since the open / close switch 11 mechanically opens and closes the contacts, when it is controlled to the off state or the on state by the control signal, a delay time (time lag) occurs until the actual controlled state is reached.

The semiconductor switch 12 (an example of the first switch) is, for example, a switch such as a thyristor, a triac, or a field effect transistor, and is connected in parallel with the open / close switch 11. That is, the semiconductor switch 12 is connected between the bypass feed line L1 and the AC output line L3, and is a switch for bypass power supply that conducts the bypass feed line L1 and the AC output line L3. The semiconductor switch 12 is switched between an off state and an on state based on a control signal supplied from the control unit 30.

Since the semiconductor switch 12 has a shorter delay time (time lag) than the open / close switch 11 when it is controlled to be in a conductive state by a control signal, the semiconductor switch 12 and the open / close switch 11 are used so that the power supply to the AC output line L3 is not interrupted. They are connected in parallel. Further, when the semiconductor switch 12 is controlled to the off state by the control signal, the period until the alternating current becomes 0 (zero) (the period until the alternating current is inverted) before the off state is reached. A delay time (time lag) shall occur. That is, the semiconductor switch 12 is a switch that, when controlled to the off state, takes a predetermined time to turn off, and does not output a state signal indicating whether or not the state has been turned off.

The output switch 13 (an example of the second switch) is, for example, an open / close switch that mechanically opens and closes contacts such as a relay switch and a switch, and is a switch for supplying power to an inverter. The output switch 13 is connected between the output line L2 of the inverter unit 20 and the AC output line L3, and conducts the output line L2 of the inverter unit 20 and the AC output line L3. The output switch 13 is switched between an off state and an on state based on the control signal supplied from the control unit 30.

The inverter unit 20 is an inverter unit that converts DC power supplied from the DC power supply 3 into AC power. The inverter unit 20 is controlled based on the control information (including, for example, an operation preparation command) transmitted by the control unit 30 and the control signal (including, for example, an output permission signal), and converts the converted AC power into an output line. Output to L2. The inverter unit 20 may communicate with the control unit 30 and be controlled by the control unit 30. Here, the configuration of the inverter unit 20 will be described with reference to FIG.

FIG. 2 is a functional block diagram showing an example of the inverter unit 20 according to the present embodiment.
As shown in FIG. 2, the inverter unit 20 includes a DC / DC conversion unit 21 (DC / DC conversion unit), a DC filter unit 22, a DC / AC conversion unit 23 (DC / AC conversion unit), and an AC filter. A unit 24, an output relay 25, and an inverter control unit 26 are provided.

The DC / DC converter 21 is, for example, an isolated DC / DC converter that converts the DC voltage Vdc supplied from the DC power supply 3 into a predetermined DC voltage.
The DC filter unit 22 is, for example, an LC filter, and removes ripples from the DC voltage converted by the DC / DC converter 21.

The DC / AC converter 23 is an inverter circuit that converts the DC voltage converted by the DC / DC converter 21 into, for example, an AC voltage Vac of 100 V, 50 Hz (hertz) (or 60 Hz). The DC / AC conversion unit 23 includes a switching element (not shown), and converts a DC voltage (DC power) into an AC voltage (AC power) by switching the switching element under the control of the inverter control unit 26.

The AC filter unit 24 is, for example, an LC filter, and removes ripples from the AC voltage converted by the DC / AC conversion unit 23.
The output relay 25 is, for example, a relay switch, and is connected between the output line of the AC filter unit 24 and the output line L2 of the AC voltage Vac. The output relay 25 is switched between an off state and an on state based on the control signal supplied from the inverter control unit 26.

The inverter control unit 26 is, for example, a processor including a CPU (Central Processing Unit) and the like, and controls the inverter unit 20 in an integrated manner. The inverter control unit 26 detects, for example, the output voltage of the DC filter unit 22, and controls the DC / DC conversion unit 21 so that the detected voltage becomes a target DC voltage. Further, the inverter control unit 26 detects, for example, the output voltage (AC voltage Vac) of the AC filter unit 24, and DC / AC conversion so that the detected voltage (AC voltage Vac) becomes the target AC voltage. Controls the switching of unit 23.

Further, the inverter control unit 26 is based on, for example, control information received from the control device 10 (control unit 30) by CAN (Controller Area Network) and a control signal (including, for example, an output permission signal). 20 controls are performed. For example, the inverter control unit 26 starts the operation of the DC / DC converter 21 based on the operation preparation command of the inverter unit 20 received from the control unit 30, conducts the output relay 25, synchronizes the AC power, and the like. Execute. Further, the inverter control unit 26 starts the operation (switching operation) of the DC / AC conversion unit 23 based on the output permission signal (control signal) of the inverter unit 20 received from the control unit 30.

Further, the inverter control unit 26 transmits various states inside the inverter unit 20 to the control unit 30 by CAN. For example, when an abnormality occurs in the inverter unit 20, the inverter control unit 26 stops the conversion in the inverter unit 20 and transmits the abnormality detection output information of the inverter unit 20 to the control unit 30. Further, for example, the inverter control unit 26 transmits the state of the output relay 25 to the control unit 30 as state output information.

Returning to the description of FIG. 1, the control unit 30 is a processor including, for example, a CPU, and controls the power supply device 1 in an integrated manner. For example, when switching from bypass power supply to inverter power supply, the control unit 30 turns on the output switch 13 with the semiconductor switch 12 conducting, and turns off the semiconductor switch 12 after the output preparation of the inverter unit 20 is completed. In this state, the conversion of the inverter unit 20 is started.

For example, when switching from bypass power supply to inverter power supply, the control unit 30 turns on the semiconductor switch 12 and turns on the output switch 13 with the open / close switch 11 turned off. Then, after the output preparation of the inverter unit 20 is completed, the control unit 30 turns off the semiconductor switch 12 and starts the conversion of the inverter unit 20. Here, the output preparation of the inverter unit 20 includes a synchronization process with the AC power (commercial voltage) output from the bypass feeder line L1.

Next, the operation of the power supply device 1 according to the present embodiment will be described with reference to the drawings.
FIG. 3 is a flowchart showing an example of the switching process of the power supply device 1 according to the present embodiment. Here, the switching process of the power supply device 1 in the case of switching from the bypass power supply to the inverter power supply will be described. Further, in the initial state, it is assumed that the open / close switch 11 is on, the inverter unit 20 is stopped, and the output switch 13 and the semiconductor switch 12 are off.

As shown in FIG. 3, the control unit 30 of the power supply device 1 first starts the output preparation of the inverter unit 20 (step S101). The control unit 30 transmits, for example, an operation preparation command of the inverter unit 20 to the inverter unit 20 by CAN. As a result, the inverter control unit 26 of the inverter unit 20 starts the operation of the DC / DC conversion unit 21 and turns on the output relay 25.

Next, the control unit 30 turns on the semiconductor switch 12 and turns on the output switch 13 (step S102). In the present embodiment, since the power supply device 1 has the open / close switch 11, the control unit 30 first turns on the semiconductor switch 12 and turns off the open / close switch 11. Then, the control unit 30 turns on the output switch 13.

Next, the control unit 30 determines whether or not the output preparation of the inverter unit 20 is completed (step S103). The control unit 30 determines, for example, whether or not the output preparation of the inverter unit 20 is completed based on the state output information of the output relay 25 output from the inverter unit 20 by the CAN. That is, the control unit 30 receives the state output information indicating that the output relay 25 is in the ON state, and further, the period for the synchronization processing with the AC power (commercial voltage) output from the bypass feeder line L1 is set. With the lapse of time, it is determined that the output preparation of the inverter unit 20 is completed.

In this way, the control unit 30 transmits a command (operation preparation command) for starting the preparation for the operation of the inverter unit 20 before turning on the output switch 13, and bypasses the output line inside the inverter unit 20. Based on the information output (state output information of the output relay 25) indicating that the AC signal output from the feeder line L1 has arrived, it is determined that the output preparation of the inverter unit 20 is completed. When the output preparation of the inverter unit 20 is completed (step S103: YES), the control unit 30 advances the process to step S104. Further, when the output preparation of the inverter unit 20 is not completed (step S103: NO), the control unit 30 returns the process to step S103.

In step S104, the control unit 30 turns off the semiconductor switch 12.
Next, the control unit 30 starts the conversion of the inverter unit 20 (step S105). The control unit 30 transmits an output permission signal to the inverter unit 20. With this output permission signal, the inverter control unit 26 of the inverter unit 20 starts the operation (switching operation) of the DC / AC conversion unit 23. This completes the switching from bypass power supply to inverter power supply. After the process of step S105, the control unit 30 ends the process.

Next, the process of switching from the bypass power supply to the inverter power supply will be described in detail with reference to FIG.
FIG. 4 is a timing chart showing an example of the switching process of the power supply device 1 according to the present embodiment. Here, as in the case of FIG. 3 described above, the switching process of the power supply device 1 in the case of switching from the bypass power supply to the inverter power supply is shown. Further, the initial state in this figure is the same as that in FIG. 3 described above.

In FIG. 4, each graph shows, in order from the top, the commercial voltage (waveform W1), the voltage of the output line of the inverter unit 20 (waveform W2), the voltage of the AC output line L3 (waveform W3), and the current of the AC output line L3 (waveform W3). Waveform W4), power supply switching state ST1, abnormality detection output information of inverter unit 20 (state ST2), operation preparation command of inverter unit 20 (waveform W5), control signal of semiconductor switch 12 (waveform W6), open / close switch 11 Control signal (waveform W7), open / close switch 11 state ST3, output switch 13 control signal (waveform W8), output switch 13 state ST4, output relay 25 state output information (state ST5), and inverter unit 20 output. The permission command (waveform W9) is shown. The horizontal axis of each graph indicates time.

At time T1, when the abnormality of the inverter unit 20 is resolved and the inverter control unit 26 of the inverter unit 20 stops the output of the abnormality detection in the abnormality detection output information (state ST2), the control unit 30 uses the CAN to display the inverter unit. The operation preparation command of 20 is transmitted to the inverter unit 20 (waveform W5). Here, it is assumed that the operation preparation of the inverter unit 20 is started when the waveform W5 is in the H state. As a result, the inverter control unit 26 starts the operation of the DC / DC conversion unit 21 in preparation for the output of the inverter unit 20.

Next, at time T2, the control unit 30 turns on the semiconductor switch 12 (waveform W6) and turns off the open / close switch 11 (waveform W7). Further, the control unit 30 turns on the output switch 13 (waveform W8).

Next, at time T3, the open / close switch 11 is delayed and turned off (state ST3), and the output switch 13 is turned on (state ST4). Since the operation delay of the semiconductor switch 12 is shorter than that of the open / close switch 11 and the output switch 13, the semiconductor switch 12 is already in the ON state at time T3 (waveform W6).

Further, at time T4, when the DC / DC conversion unit 21 is activated, the inverter control unit 26 sets the DC / AC conversion unit 23 to TR1 (for example, for one cycle) for a predetermined period in preparation for output of the inverter unit 20. After the operation (switching operation) is performed and stopped, the output relay 25 is turned on.

Next, at time T5, when the inverter control unit 26 confirms that the AC signal output from the bypass feeder line L1 has reached the output line inside the inverter unit 20, the output relay 25 is turned on. The state output information indicating that is transmitted to the control unit 30 by the CAN (state ST5). Further, the inverter control unit 26 starts synchronization processing with the AC power output from the bypass feeder line L1.

Further, at time T5, when the control unit 30 receives the state output information indicating that the output relay 25 is in the ON state, the control unit 30 secures the synchronization processing period TR2 of the inverter unit 20 and secures the semiconductor switch at time T6. 12 is turned off (waveform W6).

Next, at time T7, the control unit 30 confirms that the semiconductor switch 12 has been turned off, and transmits an output permission signal of the inverter unit 20 to the inverter control unit 26 (waveform W9). As a result, the inverter power supply is started, and the bypass power supply is switched to the inverter power supply (state ST1, waveform W2). The control unit 30 confirms that the semiconductor switch 12 has been turned off, for example, based on the voltage difference between both ends of the semiconductor switch 12.

As described above, the power supply device 1 according to the present embodiment includes a semiconductor switch 12 (first switch), an inverter unit 20, an output switch 13 (second switch), and a control unit 30. The semiconductor switch 12 conducts the bypass feed line L1 to which AC power is supplied from the outside and the AC output line L3 (AC output output line). The inverter unit 20 converts the supplied DC power into AC power. The output switch 13 is an open / close switch that mechanically opens and closes the contacts, and conducts the output line L2 of the inverter unit 20 and the AC output line L3. The control unit 30 conducts the semiconductor switch 12 when switching from the bypass power supply that supplies power from the bypass feed line L1 to the AC output line L3 to the inverter power supply that supplies the AC power converted by the inverter unit 20 to the AC output line L3. In this state, the output switch 13 is turned on (conducting state). Then, the control unit 30 turns off the semiconductor switch 12 (non-conducting state) after the output preparation of the inverter unit 20 is completed, and starts the conversion of the inverter unit 20. That is, when switching from bypass power supply to inverter power supply, the control unit 30 turns on the output switch 13 while the semiconductor switch 12 is conducting by bypass power supply, and after the output preparation of the inverter unit 20 is completed, the semiconductor The switch 12 is turned off to start the conversion of the inverter unit 20.

As a result, the power supply device 1 according to the present embodiment starts the conversion of the inverter unit 20 after the output preparation of the inverter unit 20 that can confirm that the output switch 13 is in the ON state is completed. Therefore, the power supply device 1 according to the present embodiment can delete (reduce) the semiconductor switch (semiconductor switch connected in parallel with the output switch 13) for supplying power to the inverter while keeping the output of AC power uninterrupted. .. Therefore, the power supply device 1 according to the present embodiment can be simplified in configuration while appropriately switching from bypass power supply to inverter power supply.

Further, the power supply device 1 according to the present embodiment includes an open / close switch 11 (third switch) which is connected in parallel to the semiconductor switch 12 and mechanically opens and closes the contacts. Further, the first switch described above corresponds to the semiconductor switch 12. Then, when switching from the bypass power supply to the inverter power supply, the control unit 30 turns on the semiconductor switch 12 and turns on the output switch 13 with the open / close switch 11 turned off, and causes the inverter unit 20 to turn on the output switch 13. After the output preparation of the above is completed, the semiconductor switch 12 is turned off to start the conversion of the inverter unit 20.

As a result, the power supply device 1 according to the present embodiment is used for inverter power supply while shortening the switching time from bypass power supply to inverter power supply by arranging the bypass power supply switch in parallel with the semiconductor switch 12 and the open / close switch 11. Semiconductor switches can be deleted (reduced).

Further, in the present embodiment, the control unit 30 transmits a command for starting the preparation for the operation of the inverter unit 20 (for example, an operation preparation command for the inverter unit 20) before turning on the output switch 13. Then, the control unit 30 determines the inverter based on the information output (for example, the state output information of the output relay 25) indicating that the AC signal output from the bypass feeder line L1 has reached the output line inside the inverter unit 20. It is determined that the output preparation of unit 20 is completed.
As a result, the power supply device 1 according to the present embodiment can appropriately switch from the bypass power supply to the inverter power supply while shortening the switching time from the bypass power supply to the inverter power supply in consideration of the start-up time of the inverter unit 20. ..

Further, in the present embodiment, the output preparation of the inverter unit 20 includes a synchronization process with the AC power output from the bypass feeder line L1.
As a result, the power supply device 1 according to the present embodiment switches from the bypass power supply to the inverter power supply after synchronizing with the AC power output from the bypass power supply line L1, so that the bypass power supply can be changed to the inverter power supply more safely (appropriately). You can switch.

Further, the control device 10 according to the present embodiment is a control device that controls a power supply device 1 including a semiconductor switch 12 (first switch), an inverter unit 20, and an output switch 13 (second switch). The control unit 30 is provided. When switching from bypass power supply to inverter power supply, the control unit 30 turns on the output switch 13 with the semiconductor switch 12 conducting, and turns off the semiconductor switch 12 after the output preparation of the inverter unit 20 is completed. Then, the conversion of the inverter unit 20 is started.
As a result, the configuration of the control device 10 according to the present embodiment can be simplified while appropriately switching from the bypass power supply to the inverter power supply, similarly to the power supply device 1 described above.

[Second Embodiment]
Next, the power supply device 1a and the control device 10a according to the second embodiment will be described with reference to the drawings.
In this embodiment, an example will be described in which the open / close switch 11 is used as the first switch without the semiconductor switch 12.

FIG. 5 is a functional block diagram showing an example of the power supply device 1a according to the present embodiment.
As shown in FIG. 5, the power supply device 1a includes a control device 10a, an open / close switch 11, an output switch 13, and an inverter unit 20. Further, the control device 10a is a device that controls the power supply device 1a, and includes a control unit 30a.

In this figure, the same reference numerals are given to the same configurations as those in FIG. 1, and the description thereof will be omitted. Further, since the configuration of the inverter unit 20 in this embodiment is the same as that of the inverter unit 20 in the first embodiment shown in FIG. 2 described above, the description thereof will be omitted here.
In the present embodiment, the switch for bypass power supply is only the open / close switch 11, and the open / close switch 11 functions as the first switch.

The control unit 30a is a processor including, for example, a CPU, and controls the power supply device 1a in an integrated manner. For example, when switching from bypass power supply to inverter power supply, the control unit 30a turns on the output switch 13 with the open / close switch 11 conducting, and turns off the open / close switch 11 after the output preparation of the inverter unit 20 is completed. In this state, the conversion of the inverter unit 20 is started.

Next, the operation of the power supply device 1a according to the present embodiment will be described with reference to the drawings.
FIG. 6 is a flowchart showing an example of the switching process of the power supply device 1a according to the present embodiment. Here, the switching process of the power supply device 1a when switching from the bypass power supply to the inverter power supply will be described. Further, in the initial state, it is assumed that the open / close switch 11 is on, the inverter unit 20 is stopped, and the output switch 13 is off.

As shown in FIG. 6, the control unit 30a of the power supply device 1a first starts the output preparation of the inverter unit 20 (step S201). The control unit 30a transmits, for example, an operation preparation command of the inverter unit 20 to the inverter unit 20 by CAN. As a result, the inverter control unit 26 of the inverter unit 20 starts the operation of the DC / DC conversion unit 21 and turns on the output relay 25.

Next, the control unit 30a turns on the open / close switch 11 and turns on the output switch 13 (step S202).
Next, the control unit 30a determines whether or not the output preparation of the inverter unit 20 is completed (step S203). The process of determining whether or not the output preparation of the inverter unit 20 is completed here is the same as the process of step S103 shown in FIG. 3 described above. When the output preparation of the inverter unit 20 is completed (step S203: YES), the control unit 30a advances the process to step S204. Further, when the output preparation of the inverter unit 20 is not completed (step S203: NO), the control unit 30a returns the process to step S203.

In step S204, the control unit 30a turns off the open / close switch 11.
Next, the control unit 30a starts the conversion of the inverter unit 20 (step S205). The control unit 30a transmits an output permission signal to the inverter unit 20. With this output permission signal, the inverter control unit 26 of the inverter unit 20 starts the operation (switching operation) of the DC / AC conversion unit 23. This completes the switching from bypass power supply to inverter power supply. After the process of step S205, the control unit 30a ends the process.

Next, the process of switching from the bypass power supply to the inverter power supply will be described in detail with reference to FIG. 7.
FIG. 7 is a timing chart showing an example of the switching process of the power supply device 1a according to the present embodiment. Here, as in the case of FIG. 6 described above, the switching process of the power supply device 1a in the case of switching from the bypass power supply to the inverter power supply is shown. Further, the initial state in this figure is the same as that in FIG. 6 described above.

In FIG. 7, each graph shows, in order from the top, the commercial voltage (waveform W11), the voltage of the output line of the inverter unit 20 (waveform W12), the voltage of the AC output line L3 (waveform W13), and the current of the AC output line L3 (waveform W13). Waveform W14), power supply switching state ST11, abnormality detection output information of inverter unit 20 (state ST12), operation preparation command of inverter unit 20 (waveform W15), control signal of open / close switch 11 (waveform W16), open / close switch 11. The state ST13, the control signal of the output switch 13 (waveform W17), the state ST14 of the output switch 13, the state output information of the output relay 25 (state ST15), and the output permission command (waveform W18) of the inverter unit 20 are shown. The horizontal axis of each graph indicates time.

At time T11, when the abnormality of the inverter unit 20 is resolved and the inverter control unit 26 of the inverter unit 20 stops the output of the abnormality detection in the abnormality detection output information (state ST12), the control unit 30a is subjected to the inverter unit by CAN. The operation preparation command of 20 is transmitted to the inverter unit 20 (waveform W15). Here, it is assumed that the operation preparation of the inverter unit 20 is started when the waveform W15 is in the H state. As a result, the inverter control unit 26 starts the operation of the DC / DC conversion unit 21 in preparation for the output of the inverter unit 20.

Next, at time T12, the control unit 30a turns on the output switch 13 (waveform W17). Further, at time T13, the output switch 13 is delayed and turned on (state ST14).

Next, at time T14, when the DC / DC conversion unit 21 is activated, the inverter control unit 26 sets the DC / AC conversion unit 23 to TR1 (for example, for one cycle) for a predetermined period in preparation for output of the inverter unit 20. After the operation (switching operation) is performed and stopped, the output relay 25 is turned on.

Next, at time T15, when the inverter control unit 26 confirms that the AC signal output from the bypass feeder line L1 has reached the output line inside the inverter unit 20, the output relay 25 is turned on. The state output information indicating that is transmitted to the control unit 30a by the CAN (state ST15). Further, the inverter control unit 26 starts synchronization processing with the AC power output from the bypass feeder line L1.

Further, at the time T15, when the control unit 30a receives the state output information indicating that the output relay 25 is in the ON state, the control unit 30a secures the synchronization processing period TR2 of the inverter unit 20 and secures the open / close switch at the time T16. 11 is turned off (waveform W16).

Next, at time T17, when the open / close switch 11 is turned off (ST13), the control unit 30a transmits an output permission signal of the inverter unit 20 to the inverter control unit 26 (waveform W18). As a result, the inverter power supply is started, and the bypass power supply is switched to the inverter power supply (state ST11, waveform W12).

As described above, the power supply device 1a according to the present embodiment includes an open / close switch 11 (first switch), an inverter unit 20, an output switch 13 (second switch), and a control unit 30a. The open / close switch 11 conducts the bypass feed line L1 to which AC power is supplied from the outside and the AC output line L3 (AC output output line). The inverter unit 20 converts the supplied DC power into AC power. The output switch 13 is a switch that mechanically opens and closes the contacts, and makes the output line L2 of the inverter unit 20 and the AC output line L3 conductive. When switching from bypass power supply to inverter power supply, the control unit 30a turns on the output switch 13 (conducting state) with the open / close switch 11 conducting. Then, the control unit 30a turns off the open / close switch 11 (non-conducting state) after the output preparation of the inverter unit 20 is completed, and starts the conversion of the inverter unit 20. That is, when switching from bypass power supply to inverter power supply, the control unit 30a turns on the output switch 13 while the open / close switch 11 is conducting by bypass power supply, and opens and closes after the output preparation of the inverter unit 20 is completed. The switch 11 is turned off to start the conversion of the inverter unit 20.

As a result, the power supply device 1a according to the present embodiment is a semiconductor switch for supplying inverter power (a semiconductor switch connected in parallel to the output switch 13) while keeping the output of AC power uninterrupted, as in the first embodiment. ) Can be deleted (reduced). Therefore, the power supply device 1a according to the present embodiment can be simplified in configuration while appropriately switching from bypass power supply to inverter power supply.
Further, since the number of semiconductor switches 12 in the power supply device 1a according to the present embodiment is reduced as compared with the first embodiment, the configuration can be further simplified.

The present invention is not limited to each of the above embodiments, and can be modified without departing from the spirit of the present invention.
For example, in each of the above embodiments, the power supply device 1 (1a) has been described as having one inverter unit 20, but the present invention is not limited to this. The power supply device 1 (1a) may include a plurality of inverter units 20 and each inverter unit 20 may be connected in parallel. As a result, the power supply device 1 (1a) can increase the AC power that can be supplied to the inverter.

Further, in each of the above embodiments, the power supply device 1 (1a) has described an example in which a commercial power supply of 100 V is directly supplied as a bypass power supply, but an AC voltage such as 200 V may be supplied as a bypass power supply.
Further, in each of the above embodiments, an example of communicating between the control unit 30 (30a) and the inverter control unit 26 by CAN has been described, but instead of communication by CAN, a control signal such as an output permission signal has been described. May be used.

Further, in the second embodiment described above, an example in which the open / close switch 11 is used as the first switch has been described, but the present invention is not limited to this. For example, when the semiconductor switch can conduct sufficient electric power, the power supply device 1a may include the semiconductor switch 12 instead of the open / close switch 11, and the semiconductor switch 12 may be used as the first switch. In this case, the power supply device 1a can shorten the switching time from the bypass power supply to the inverter power supply by the semiconductor switch 12.

Further, in the first embodiment described above, at the time T2 shown in FIG. 4, the control unit 30 controls the semiconductor switch 12 and the output switch 13 to be turned on and the open / close switch 11 to be turned off. An example of performing at the same timing has been described, but the present invention is not limited to this. The control unit 30 may control the control timing of each switch in this case by shifting the control timing so that the bypass power supply is not interrupted.

The control unit 30 (30a) of the power supply device 1 (1a) described above has a computer system inside. The processing process by the control unit 30 (30a) of the power supply device 1 (1a) described above is stored in a computer-readable recording medium in the form of a program, and the computer reads and executes this program. The above processing is performed. Here, the computer-readable recording medium refers to a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like. Further, this computer program may be distributed to a computer via a communication line, and the computer receiving the distribution may execute the program.

Further, a part or all of the functions provided by the control unit 30 (30a) of 1 (1a) described above may be realized as an integrated circuit such as an LSI (Large Scale Integration). Each of the above-mentioned functions may be made into a processor individually, or a part or all of them may be integrated into a processor. Further, the method of making an integrated circuit is not limited to LSI, and may be realized by a dedicated circuit or a general-purpose processor. Further, when an integrated circuit technology that replaces an LSI appears due to advances in semiconductor technology, an integrated circuit based on this technology may be used.

1, 1a power supply 2 Commercial power supply 3 DC power supply 10, 10a Control device 11 Open / close switch 12 Semiconductor switch 13 Output switch 20 Inverter unit 21 DC / DC conversion unit 22 DC filter unit 23 DC / AC conversion unit 24 AC filter unit 25 Output Relay 26 Inverter control unit 30, 30a Control unit

Claims (6)

A first switch that conducts the bypass feed line to which AC power is supplied from the outside and the output line of the AC output,
Inverter section that converts the supplied DC power to AC power,
An open / close switch that mechanically opens and closes contacts, and a second switch that conducts the output line of the inverter section and the output line of the AC output.
When switching from the bypass power supply that supplies power from the bypass power supply line to the output line of the AC output to the inverter power supply that supplies power to the output line of the AC output from the AC power converted by the inverter unit, the first switch is conducted. In this state, the second switch is brought into a conductive state, and before the inverter unit outputs AC power, a voltage is supplied to the conversion unit that converts DC power into AC power, and the AC power generated by the bypass power supply is used. After the output preparation of the inverter unit, which is in a state where the period for the synchronization processing of the above, has elapsed, the first switch is brought into a non-conducting state, and a control unit for starting the conversion of the inverter unit is provided .
The control unit
It is a command to start the preparation for the operation of the inverter unit before making the second switch conductive, and supplies a voltage to the conversion unit to start the synchronization process with the AC power by the bypass power supply. It is an information output indicating that an AC signal output from the bypass feeder has reached the output line inside the inverter unit by transmitting a command, and the output line inside the inverter unit and the bypass feeder Based on the information output that outputs the state of the output relay switch connected between, it is determined that the output preparation of the inverter unit is completed.
The power supply device comprising a call. A first switch that conducts the bypass feed line to which AC power is supplied from the outside and the output line of the AC output,
Inverter section that converts the supplied DC power to AC power,
An open / close switch that mechanically opens and closes contacts, and a second switch that conducts the output line of the inverter section and the output line of the AC output.
When switching from the bypass power supply that supplies power from the bypass feed line to the output line of the AC output to the inverter power supply that supplies the AC power converted by the inverter unit to the output line of the AC output, the first switch is conducted. In this state, the second switch is brought into a conductive state, and after the output preparation of the inverter section is completed, the first switch is brought into a non-conducting state and the conversion of the inverter section is started.
With
To prepare the output of the inverter unit, before outputting the AC power in the inverter unit, a voltage is supplied to the conversion unit that converts the DC power into the AC power, and the voltage is synchronized with the AC power output from the bypass power supply line. Processing is included,
After the output preparation of the inverter unit is completed, the period for the synchronization processing with the AC power by the bypass power supply has elapsed.
A power supply that is characterized by that. A third switch, which is an open / close switch that is connected in parallel to the first switch and mechanically opens and closes contacts, is provided.
The first switch is a semiconductor switch.
When switching from the bypass power supply to the inverter power supply, the control unit makes the first switch conductive and conducts the second switch in a non-conducting state. is the state, after the output preparation of the inverter unit is completed, the first switch is non-conductive, according to claim 1 or claim 2, characterized in that to start the conversion of the inverter Power supply. The first switch is an open / close switch that mechanically opens and closes contacts.
When switching from the bypass power supply to the inverter power supply, the control unit makes the second switch conductive while the first switch is conducting by the bypass power supply, and outputs the inverter unit. The power supply device according to claim 1 or 2 , wherein after the preparation is completed, the first switch is brought into a non-conducting state to start conversion of the inverter unit. The first switch that conducts the bypass power supply line to which AC power is supplied from the outside and the output line of the AC output, the inverter unit that converts the supplied DC power to AC power, and the opening and closing that mechanically opens and closes the contacts. A control device that controls a power supply device including a second switch that conducts the output line of the inverter unit and the output line of the AC output.
When switching from the bypass power supply that supplies power from the bypass power supply line to the output line of the AC output to the inverter power supply that supplies power to the output line of the AC output from the AC power converted by the inverter unit, the first switch is conducted. In this state, the second switch is brought into a conductive state, and before the inverter unit outputs AC power, a voltage is supplied to the conversion unit that converts DC power into AC power, and the AC power generated by the bypass power supply is used. After the output preparation of the inverter unit, which is in a state where the period for the synchronization processing of the above, has elapsed, the first switch is brought into a non-conducting state, and a control unit for starting the conversion of the inverter unit is provided .
The control unit
It is a command to start the preparation for the operation of the inverter unit before making the second switch conductive, and supplies a voltage to the conversion unit to start the synchronization process with the AC power by the bypass power supply. It is an information output indicating that an AC signal output from the bypass feeder has reached the output line inside the inverter unit by transmitting a command, and the output line inside the inverter unit and the bypass feeder A control device characterized in that it is determined that the output preparation of the inverter unit is completed based on the information output that outputs the state of the output relay switch connected between the two. The first switch that conducts the bypass power supply line to which AC power is supplied from the outside and the output line of the AC output, the inverter unit that converts the supplied DC power to AC power, and the opening and closing that mechanically opens and closes the contacts. A control device that controls a power supply device including a second switch that conducts the output line of the inverter unit and the output line of the AC output.
When switching from the bypass power supply that supplies power from the bypass feed line to the output line of the AC output to the inverter power supply that supplies the AC power converted by the inverter unit to the output line of the AC output, the first switch is conducted. In this state, the second switch is brought into a conductive state, and after the output preparation of the inverter section is completed, the first switch is brought into a non-conducting state to start conversion of the inverter section. ,
To prepare the output of the inverter unit, before outputting the AC power in the inverter unit, a voltage is supplied to the conversion unit that converts the DC power into the AC power, and the voltage is synchronized with the AC power output from the bypass power supply line. Processing is included,
After the output preparation of the inverter unit is completed, the period for the synchronization processing with the AC power by the bypass power supply has elapsed.
A control device characterized by that.

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