Power supply device

Abstract

To restrict instantaneous power required to turn on a plurality of electromagnetic contactors.SOLUTION: A power supply device includes: a first electromagnetic contactor for receiving first power supplied from a first power source; a second electromagnetic contactor for receiving second power supplied from a second power source; a power supply circuit for generating third power; a control device driven by the third power for transmitting a first signal for turning on the first electromagnetic contactor to the first electromagnetic contactor, and transmitting a second signal for turning on the second electromagnetic contactor to the second electromagnetic contactor after the first electromagnetic contactor becomes stable in on-state; a first power conversion system for converting received first power by receiving the first power through the first electromagnetic contactor in on-state; and a second power conversion system for converting received second power by receiving the second power through the second electromagnetic contactor in on-state.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a power supply device.

Background Art

[0002] Conventionally, there is a power supply device including a plurality of power conversion systems to which power from independent power sources is input. Such a power supply device can generate high-output power by synthesizing the power output from the plurality of power conversion systems.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the above-described power supply device, electromagnetic contactors are individually provided on the input sides of the plurality of power conversion systems.

[0005] An object of the present invention is to suppress the instantaneous power required to turn on a plurality of electromagnetic contactors provided in a power supply device.

Means for Solving the Problems

[0006] The power supply device according to the present invention includes a first electromagnetic contactor that receives first power supplied from a first power source, a second electromagnetic contactor that receives second power supplied from a second power source, a power supply circuit that generates third power, and a control device that is driven by the third power, transmits a first signal for turning on the first electromagnetic contactor to the first electromagnetic contactor, and after the first electromagnetic contactor is stably in the on state, transmits a second signal for turning on the second electromagnetic contactor to the second electromagnetic contactor; a first power conversion system that receives the first power via the first electromagnetic contactor in the on state and converts the received first power; and a second power conversion system that receives the second power via the second electromagnetic contactor in the on state and converts the received second power, and includes a power conversion block that synthesizes and outputs the first power converted by the first power conversion system and the second power converted by the second power conversion system.

Advantages of the Invention

[0007] According to the present invention, it is possible to suppress the instantaneous power required to turn on a plurality of electromagnetic contactors provided in the power supply device.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

DETAILED DESCRIPTION OF THE INVENTION

[0009] The power supply device according to the embodiment can be applied to any power supply device as long as it generates power to be supplied to a load using input power from a plurality of power sources. Here, as an example of the power supply device according to the embodiment, a power supply device 1 that generates high-voltage DC power using AC power input from two power sources will be described.

[0010] FIG. 1 is a diagram showing the power supply device 1 according to the embodiment connected to the load 2.

[0011] The power supply device 1 receives AC power input from two AC power sources (in other words, AC power supplies). Here, as an example, the voltage, current, and frequency of the AC power input from the two AC power sources are common between the two AC power sources. Note that the voltage, current, or frequency of the AC power input from the two AC power sources does not necessarily have to be common between the two AC power sources.

[0012] Based on the AC power input from the two AC power sources, the power supply device 1 generates high-voltage DC power to be supplied to the load. As a configuration for that, the power supply device 1 includes two AC power connectors 11a and 11b, two electromagnetic contactors 12a and 12b, two power conversion systems 13a and 13b, a power supply circuit 14, and a control device 15. The two power conversion systems 13a and 13b constitute a power conversion block 16.

[0013] The AC power connector 11a receives AC power from one of the two AC power sources. The AC power received by the AC power connector 11a is input to the power conversion system 13a via the electromagnetic contactor 12a.

[0014] The AC power connector 11b receives AC power from the other of the two AC power supplies. The AC power received by the AC power connector 11b is input to the power conversion system 13b via the electromagnetic contactor 12b.

[0015] The electromagnetic contactor 12a includes a fixed contact (not shown), a movable contact (not shown) that is moved by a coil, and a holding circuit (not shown). The coil is excited by the power of the signal SIG1a input from the control device 15. When the coil is excited, the movable contact and the fixed contact come into contact, whereby the electromagnetic contactor 12a is turned on. That is, a power path connecting the AC power connector 11a and the power conversion system 13a is formed, and the AC power received by the AC power connector 11a flows through this power path to the power conversion system 13a.

[0016] When the coil is not excited, the movable contact is separated from the fixed contact, and the electromagnetic contactor 12a is turned off. That is, since the movable contact is separated from the fixed contact, the power path connecting the AC power connector 11a and the power conversion system 13a is interrupted, and the AC power received by the AC power connector 11a does not flow to the power conversion system 13a.

[0017] The holding circuit includes a capacitor. The capacitor is charged by the power of the signal SIG1a input from the control device 15. The power stored in the capacitor is used to continue exciting the coil for a while even if the power input from the control device 15 temporarily decreases or is interrupted.

[0018] The electromagnetic contactor 12b has the same configuration as the electromagnetic contactor 12b. The electromagnetic contactor 12b is turned on by the power of the signal SIG1b input from the control device 15. When the electromagnetic contactor 12b is turned on, a power path connecting the AC power connector 11b and the power conversion system 13b is formed, and the AC power received by the AC power connector 11b flows through this power path to the power conversion system 13b. When the electromagnetic contactor 12b is turned off, the power path connecting the AC power connector 11b and the power conversion system 13b is interrupted, and the AC power received by the AC power connector 11b does not flow to the power conversion system 13b.

[0019] The details of the behavior of the electromagnetic contactors 12a and 12b will be described later.

[0020] The power conversion system 13a performs power conversion on the AC power received via the ON-state electromagnetic contactor 12a to generate high-voltage DC power. The power conversion system 13b performs power conversion on the AC power received via the ON-state electromagnetic contactor 12b to generate high-voltage DC power.

[0021] The power conversion block 16 combines the power generated by the power conversion system 13a and the power generated by the power conversion system 13b to generate DC power with a higher voltage than the power generated by each of the power conversion systems 13a and 13b. The power conversion block 16 outputs the high-voltage DC power generated by the combination. The high-voltage DC power output by the power conversion block 16 is supplied to the load 2.

[0022] The power conversion system 13a includes a rectifier circuit 101a, a boost circuit 102a, a buck circuit 103a, an inverter circuit 104a, four transformers 105a-1, 105a-2, 105a-3, 105a-4, and four boost rectifier circuits 106a-1, 106a-2, 106a-3, 106a-4.

[0023] The rectifier circuit 101a rectifies and smoothes the AC power input via the electromagnetic contactor 12a and outputs DC power.

[0024] The boost circuit 102a is a circuit that boosts DC power by a ratio corresponding to the on-duty ratio of a schematic switching element provided in the boost circuit 102a. The buck circuit 103a is a circuit that buck-boosts DC power by a ratio corresponding to the on-duty ratio of a schematic switching element provided in the buck circuit 103a. The DC power output from the rectifier circuit 101a is converted into DC power with a predetermined voltage by being boosted by the boost circuit 102a and buck-boosted by the buck circuit 103a.

[0025] The inverter circuit 104a converts the DC power output from the step-down circuit 103a into AC power by means of a schematic switching element provided in the inverter circuit 104a.

[0026] The AC power generated by the inverter circuit 104a is input in parallel to the primary sides of four transformers 105a-1, 105a-2, 105a-3, and 105a-4. To the secondary side of each of the four transformers 105a-1, 105a-2, 105a-3, and 105a-4, one of four boost rectifier circuits 106a-1, 106a-2, 106a-3, and 106a-4 is connected one-to-one. The AC power whose voltage has been converted by the four transformers 105a-1, 105a-2, 105a-3, and 105a-4 at a predetermined ratio is rectified to DC and boosted by the four boost rectifier circuits 106a-1, 106a-2, 106a-3, and 106a-4.

[0027] The power conversion system 13b includes a rectifier circuit 101b, a boost circuit 102b, a step-down circuit 103b, an inverter circuit 104b, four transformers 105b-1, 105b-2, 105b-3, and 105b-4, and four boost rectifier circuits 106b-1, 106b-2, 106b-3, and 106b-4.

[0028] The rectifier circuit 101b rectifies and smoothes the AC power input via the electromagnetic contactor 12b and outputs DC power.

[0029] The boost circuit 102b is a circuit that boosts DC power at a ratio corresponding to the on-duty ratio of a schematic switching element provided in the boost circuit 102b. The step-down circuit 103b is a circuit that steps down DC power at a ratio corresponding to the on-duty ratio of a schematic switching element provided in the step-down circuit 103b. The DC power output by the rectifier circuit 101b is boosted by the boost circuit 102b and stepped down by the step-down circuit 103b, thereby being converted into DC power at a predetermined voltage.

[0030] The inverter circuit 104b converts the DC power output from the step-down circuit 103b into AC power by means of a schematic switching element provided in the inverter circuit 104b.

[0031] The AC power generated by the inverter circuit 104b is input in parallel to the primary sides of the four transformers 105b-1, 105b-2, 105b-3, and 105b-4. To the secondary side of each of the four transformers 105b-1, 105b-2, 105b-3, and 105b-4, any one of the four step-up rectifier circuits 106b-1, 106b-2, 106b-3, and 106b-4 is connected one-to-one. The AC power whose voltage has been converted at a predetermined ratio by the four transformers 105b-1, 105b-2, 105b-3, and 105b-4 is rectified to DC and stepped up by the four step-up rectifier circuits 106b-1, 106b-2, 106b-3, and 106b-4.

[0032] The output sides of a total of eight step-up rectifier circuits 106 including the four step-up rectifier circuits 106a-1, 106a-2, 106a-3, 106a-4 and the four step-up rectifier circuits 106b-1, 106b-2, 106b-3, 106b-4 are connected in series. Thereby, the DC power output from the eight step-up rectifier circuits 106 is combined to generate high-voltage DC power. The high-voltage DC power generated from the DC power output from the eight step-up rectifier circuits 106 is supplied to the load 2.

[0033] The power supply circuit 14 generates the power for driving various components including the control device 15. As the power supply circuit 14, for example, a switching power supply can be used. Note that the power supply circuit 14 does not have to be a switching power supply.

[0034] The control device 15 controls some of the components provided in the power supply device 1 using the power generated by the power supply circuit 14.

[0035] Specifically, the control device 15 generates a signal SIG1a for turning on / off the electromagnetic contactor 12a and inputs it to the electromagnetic contactor 12a, and generates a signal SIG1b for turning on / off the electromagnetic contactor 12b and inputs it to the electromagnetic contactor 12b. The signals SIG1a and SIG1b are binary signals that transition between two voltage values. Here, as an example, it is assumed that the high-voltage level of the signals SIG1a and SIG1b is 24V and the low-voltage level is 0V.

[0036] Hereinafter, each of the signals SIG1a and SIG1b may be referred to as signal SIG1. Also, each of the electromagnetic contactors 12a and 12b may be referred to as electromagnetic contactor 12.

[0037] Furthermore, each of the AC power connectors 11a and 11b may be referred to as AC power connector 11. Each of the power conversion systems 13a and 13b may be referred to as power conversion system 13.

[0038] In addition, the control device 15 can generate a signal SIG2a for turning on / off the switching element included in the boost circuit 102a, a signal SIG2b for turning on / off the switching element included in the boost circuit 102b, a signal SIG3a for turning on / off the switching element included in the buck circuit 103a, a signal SIG3b for turning on / off the switching element included in the buck circuit 103b, a signal SIG104a for turning on / off the switching element included in the inverter circuit 104a, and a signal SIG104b for turning on / off the switching element included in the inverter circuit 104b, and transmit each generated signal to each circuit.

[0039] Subsequently, the behavior of the electromagnetic contactor 12 will be described. FIG. 2 is a diagram showing the time evolution of the output voltage and output current of the power supply circuit 14 with respect to the control device 15, and the state of the electromagnetic contactor 12, when one electromagnetic contactor 12 according to the embodiment is turned on alone.

[0040] The power supply circuit 14 is configured to supply power with a voltage value V1 to the control device 15. During the period when the control device 15 maintains the signal SIG1 at 0 V (i.e., the period from time t0 to t1), the current flowing through the signal line of the signal SIG1 is zero, and thereby, the output current of the control device 15 is zero.

[0041] When the control device 15 inputs 24 V of power as the signal SIG1 (at time t1), a current corresponding to the current flowing as the signal SIG1 flows from the power supply circuit 14 to the control device 15. Here, the maximum value of the current value of the current flowing from the power supply circuit 14 to the control device 15 is denoted as A1.

[0042] After some time from time t1, the excitation of the coil is completed, and thereby the electromagnetic contactor 12 becomes in the on state (at time t2).

[0043] As described above, the electromagnetic contactor 12 includes a holding circuit having a capacitor. Until the charging of this capacitor is completed, a current continues to flow as the signal SIG1. In the example of FIG. 2, at time t2, the charging of the capacitor is not completed, and a current continues to flow as the signal SIG1 even after time t2. More precisely, as the signal SIG1, in addition to the current for continuing the excitation of the coil, a current for charging the capacitor continues to flow. Therefore, even after time t2, a current corresponding to the current flowing as the signal SIG1 flows from the power supply circuit 14 to the control device 15.

[0044] At time t3, the charging of the capacitor is completed, and the current that has been flowing as the signal SIG1 for charging the capacitor until then stops. After time t3, a current for continuing the excitation of the coil flows as the signal SIG1. The current for continuing the excitation of the coil is significantly smaller than the current for charging the capacitor. Therefore, the amount of current flowing from the power supply circuit 14 to the control device 15 becomes significantly smaller. The state where the charging of the capacitor provided in the holding circuit is completed is denoted as the holding state. When the electromagnetic contactor 12 becomes in the holding state, the electromagnetic contactor 12 stabilizes in the on state.

[0045] Thus, when turning on one electromagnetic contactor 12, a large instantaneous power (power of current value A1 according to the example of FIG. 2) is required.

[0046] Here, the technology to be compared with the embodiment will be described. The technology to be compared with the embodiment is denoted as a comparative example. The power supply device according to the comparative example includes a power supply circuit similar to the power supply circuit 14, a control device similar to the control device 15, and two electromagnetic contactors #1 and #2 each having a configuration similar to that of the electromagnetic contactor 12. Then, the control device turns on the two electromagnetic contactors #1 and #2 simultaneously. The signal for the control device to turn on the electromagnetic contactors #1 and #2 is denoted as signal SIG.

[0047] FIG. 3 is a diagram showing the time transition of the output voltage and output current of the power supply circuit with respect to the control device, and the states of the electromagnetic contactors #1 and #2, in the power supply device according to the comparative example.

[0048] The power supply circuit supplies power with a voltage value of V1 to the control device. During the period when the control device maintains the signal SIG at 0V (i.e., the period from time t10 to t11), the current flowing through the signal line of the signal SIG is zero, and thereby, the output current of the control device is zero.

[0049] When the control device applies 24V power as the signal SIG to the two electromagnetic contactors #1 and #2 (at time t11), a current corresponding to the current flowing as the signal SIG flows from the power supply circuit to the control device.

[0050] After a while from time t11, the excitation of the coil is completed, and thereby, the two electromagnetic contactors #1 and #2 are simultaneously in the on state (at time t12). After that, as the signal SIG, a current continues to flow to charge the capacitors of the holding circuits provided in the two electromagnetic contactors #1 and #2, and thereby, the current value of the current flowing from the power supply circuit to the control device has reached approximately twice that of A1.

[0051] The power supply circuit may have a protection function that limits the power output to a predetermined level in order to prevent a current exceeding the capacity of the power supply circuit from flowing. In the comparative example, the protection function activates after time t12, and as a result, the voltage value of the output voltage of the power supply circuit gradually decreases from V1.

[0052] While the voltage value of the output voltage of the power supply circuit continues to decrease, at time t13, one of the electromagnetic contactors #1 and #2 enters the held state, and at time t14, the other electromagnetic contactor of electromagnetic contactors #1 and #2 enters the held state. However, it is difficult to maintain the excitation of the coil with the decreased output voltage of the power supply circuit, and at time t15, electromagnetic contactor #2 is turned off.

[0053] Thus, according to the comparative example, in order to turn on a plurality of electromagnetic contactors, an instantaneous power greater than the instantaneous power required to turn on each individual electromagnetic contactor (power with a current value of 2*A1 according to the example of FIG. 3) is required. Therefore, when the capacity of the power supply circuit is not sufficient, as shown in FIG. 3, when turning on a plurality of electromagnetic contactors, the protection function of the power supply circuit may activate and it may not be possible to turn on some or all of the plurality of electromagnetic contactors. And in order to surely turn on all of the plurality of electromagnetic contactors, it is necessary to prepare a power supply circuit with a large capacity.

[0054] In the embodiment, in order to suppress the instantaneous power required when turning on all of the plurality of electromagnetic contactors, in the power supply device 1, one electromagnetic contactor 12 is turned on, and after the electromagnetic contactor 12 is stable in the on state, the next electromagnetic contactor 12 is turned on.

[0055] FIG. 4 is a diagram showing the time transitions of the output voltage and output current of the power supply circuit 1 with respect to the control device 15, and the states of the two electromagnetic contactors 12 in the power supply device 1 according to the embodiment.

[0056] The power supply circuit 14 supplies power with a voltage value V1 to the control device 15. During the period when the control device 15 maintains the signals SIG1a and SIG1b at 0 V (i.e., the period from time t20 to t21), the current flowing through the signal lines of the signals SIG1a and SIG1b is zero, and thereby, the output current of the control device 15 is zero.

[0057] When the control device 15 starts to apply a 24 V signal SIG1a to the electromagnetic contactor 12a at time t21, a current corresponding to the current flowing as the signal SIG1a starts to flow from the power supply circuit 14 to the control device 15 (time t21).

[0058] After some time from time t21, the excitation of the coil of the electromagnetic contactor 12a is completed, and thereby the electromagnetic contactor 12a becomes on state (time t22). Thereafter, also as the signal SIG1a, a current for charging the capacitor of the holding circuit provided in the electromagnetic contactor 12a continues to flow, and thereby, a current with a maximum current value A1 flows from the power supply circuit 14 to the control device 15.

[0059] At time t23, the electromagnetic contactor 12a becomes in a holding state, and the electromagnetic contactor 12a stabilizes in the on state. Then, the amount of current flowing from the power supply circuit 14 to the control device 15 becomes significantly small.

[0060] At time t24 after the electromagnetic contactor 12a becomes in the holding state, the control device 15 starts to apply a 24 V signal SIG1b to the electromagnetic contactor 12b. Then, a current corresponding to the current flowing as the signal SIG1b starts to flow from the power supply circuit 14 to the control device 15.

[0061] After some time from time t24, the excitation of the coil of the electromagnetic contactor 12b is completed, and thereby the electromagnetic contactor 12b becomes on state (time t25). Thereafter, also as the signal SIG1b, a current for charging the capacitor of the holding circuit provided in the electromagnetic contactor 12b continues to flow, and thereby, a current with a maximum current value A1 flows from the power supply circuit 14 to the control device 15.

[0062] At time t26, the electromagnetic contactor 12b enters the holding state and stabilizes in the on state. Then, the amount of current flowing from the power supply circuit 14 to the control device 15 becomes extremely small. Thus, both the electromagnetic contactors 12a and 12b stabilize in the on state.

[0063] In this way, after stabilizing one electromagnetic contactor 12 in the on state, the control device 15 turns on the next electromagnetic contactor 12. As a result, the maximum value of the current value of the current flowing from the power supply circuit 14 to the control device 15 becomes approximately equal to the maximum value of the current value of the current flowing from the power supply circuit 14 to the control device 15 when turning on one electromagnetic contactor 12. That is, compared with the power supply device according to the comparative example, it is possible to suppress the instantaneous power required when turning on a plurality of electromagnetic contactors 12.

[0064] In the embodiment, as an example, the interval between the timings at which the application of the 24V signal SIG1 to the two electromagnetic contactors 12 is started is set in advance. If the time from starting the application of the 24V signal SIG1 to a single electromagnetic contactor 12 until the single electromagnetic contactor 12 is turned on and enters the holding state is T0, a value T1 larger than T0 is set in the control device 15 in advance. The control device 15 sequentially applies the 24V signal SIG1 to the two electromagnetic contactors 12 at intervals of the set time T1.

[0065] FIG. 5 is a flowchart showing the operation of turning on the electromagnetic contactors 12a and 12b by the control device 15 according to the embodiment.

[0066] First, the control device 15 applies a 24V signal SIG1a as a signal SIG1a for turning on the electromagnetic contactor 12a to the electromagnetic contactor 12a (S101). Then, when the set time T1 has elapsed since starting the application of the 24V signal SIG1a to the electromagnetic contactor 12a (S102), the control device 15 applies a 24V signal SIG1b as a signal SIG1b for turning on the electromagnetic contactor 12b to the electromagnetic contactor 12b (S103). Then, the operation of turning on the electromagnetic contactors 12a and 12b ends.

[0067] As described above, according to the embodiment, the control device 15 transmits a 24V signal SIG1a as a signal SIG1a for turning on the electromagnetic contactor 12a to the electromagnetic contactor 12a, and after the electromagnetic contactor 12a is stably turned on, transmits a 24V signal SIG1b as a signal SIG1b for turning on the electromagnetic contactor 12b to the electromagnetic contactor 12b.

[0068] Therefore, it is possible to suppress the instantaneous power required to turn on a plurality of electromagnetic contactors provided in the power supply device as compared with the comparative example.

[0069] In addition, the control device 15 starts transmitting the 24V signal SIG1b to the electromagnetic contactor 12b as the elapsed time of the set time T1 after the start of transmission of the 24V signal SIG1a to the electromagnetic contactor 12a.

[0070] A time longer than the time T0 from the start of the input of the 24V signal SIG1 to the single electromagnetic contactor 12 until it is stably turned on is set as the set time T1. Thereby, after the electromagnetic contactor 12a is stably turned on, it becomes possible to transmit a 24V signal SIG1b as a signal SIG1b for turning on the electromagnetic contactor 12b to the electromagnetic contactor 12b.

[0071] In the above, it has been described that the power received by the electromagnetic contactor 12 from an external power source is AC power. The power received by the electromagnetic contactor 12 may be DC power. When the power received by the electromagnetic contactor 12 is DC power, the power conversion system 13 is configured to convert the DC power received via the electromagnetic contactor 12.

[0072] In addition, the power supply device 1 has been described as including two electromagnetic contactors 12 and two power conversion systems 13. The power supply device 1 may include three or more pairs of the electromagnetic contactor 12 and the power conversion system 13. When the power supply device 1 includes three or more pairs of the electromagnetic contactor 12 and the power conversion system 13, if the control device 15 executes the processes of S101 to S103 in FIG. 5 for at least two of the three or more electromagnetic contactors 12, it is possible to suppress the instantaneous power required when turning on all the electromagnetic contactors 12.

[0073] In addition, when the power supply device 1 includes three or more pairs of the electromagnetic contactor 12 and the power conversion system 13, the control device 15 may be configured to turn on the three or more electromagnetic contactors 12 one by one with a shifted timing, and to turn on the next electromagnetic contactor 12 after one electromagnetic contactor 12 has been stably turned on.

[0074] Also, it has been described that the level on the high voltage side of the signal SIG1 is 24V. The level on the high voltage side of the signal SIG1 is not limited to 24V.

[0075] Further, the control device 15 may be configured to be able to confirm that the electromagnetic contactor 12 has been stably turned on. After the control device 15 starts transmitting the signal SIG1 for turning on a certain electromagnetic contactor 12, it holds off on transmitting the signal SIG1 for turning on the next electromagnetic contactor 12 until it can confirm that the electromagnetic contactor 12 has been stably turned on. Then, when it is confirmed that the electromagnetic contactor 12 that started transmitting the signal SIG1 first has been stably turned on, the control device 15 may start transmitting the signal SIG1 for turning on the next electromagnetic contactor 12.

[0076] The method for confirming that the electromagnetic contactor 12 has been stably turned on is not limited to a specific method. In one example, a sensor for measuring the value of the current flowing through the signal line of the signal SIG1 is provided in the power supply device 1. A value of the current (referred to as a set current value) for continuing the excitation of the coil is preset in the control device 15. The control device 15 determines whether the electromagnetic contactor 12 has been stably turned on based on whether the current value obtained by the sensor has dropped to the set current value.

[0077] As described above, the embodiments of the present invention have been described, but these embodiments are presented as examples and are not intended to limit the scope of the invention. The embodiments can be variously modified.

Explanation of Reference Numerals

[0078] 1 Power supply device, 2 Load, 11, 11a, 11b AC power connectors, 12, 12a, 12b Electromagnetic contactors, 13, 13a, 13b Power conversion systems, 14 Power supply circuit, 15 Control device, 16 Power conversion block, 101a, 101b Rectifier circuits, 102a, 102b Boost circuits, 103a, 103b Buck circuits, 104a, 104b Inverter circuits, 105a-1, 105a-2, 105a-3, 105a-4, 105b-1, 105b-2, 105b-3, 105b-4 Transformers, 106, 106a-1, 106a-2, 106a-3, 106a-4, 106b-1, 106b-2, 106b-3, 106b-4 Boost rectifier circuits.

Claims

1. A first electromagnetic contactor that receives first power supplied from a first power source; A second electromagnetic contactor that receives second power supplied from a second power source; A power supply circuit that generates third power; A control device that is driven by the third power, transmits a first signal for turning on the first electromagnetic contactor to the first electromagnetic contactor, and after the first electromagnetic contactor is stably in the on state, transmits a second signal for turning on the second electromagnetic contactor to the second electromagnetic contactor; A first power conversion system that receives the first power via the first electromagnetic contactor in the on state and converts the received first power, and a second power conversion system that receives the second power via the second electromagnetic contactor in the on state and converts the received second power, and a power conversion block that synthesizes and outputs the first power converted by the first power conversion system and the second power converted by the second power conversion system; A power supply device comprising the same.

2. The control device starts transmitting the second signal in response to the elapse of a set time after the start of transmission of the first signal. The power supply device according to Claim 1.

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