JP2012039791A - Power supply inspection device, power supply inspection method, and power supply device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply inspection device capable of inspecting a power supply device without halting the power supply device.SOLUTION: The power supply inspection device includes: an AC detection part which detects an AC component of a charging current to a storage battery of a power supply device equipped with a rectification circuit that rectifies an inputted three-phase AC voltage, a capacitor which smooths an output of the rectification circuit, and the storage battery which is charged with a current from the capacitor; and a determination part which, based on the detection result of the AC detection part, determines at least whether the rectification circuit operates at a predetermined timing according to a level of the three-phase AC voltage, or whether a capacitance value of the capacitor is a predetermined value.

Description

  The present invention relates to a power supply inspection device, a power supply inspection method, and a power supply device.

  Some DC power supply devices that generate DC voltage by rectifying and smoothing input AC voltage include a storage battery. Such a DC power supply device is generally called an uninterruptible power supply device, and generates a DC voltage using a storage battery as a power source when no AC voltage is input (see, for example, Patent Document 1).

JP 2002-101571 A

  In the above-described DC power supply device, if a storage battery, a rectifier circuit that rectifies an AC voltage, or the like is deteriorated, a desired DC voltage may not be generated. For this reason, the storage battery is diagnosed by a technique disclosed in Patent Document 1, for example, while the DC power supply device is operating. On the other hand, the inspection of whether or not there is an abnormality in the rectifier circuit or the like is generally performed while the operation of the DC power supply device is stopped. As a result, when the rectifier circuit or the like is inspected, it is necessary to stop not only the DC power supply device but also the equipment to which the power of the DC power supply device is supplied.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a power supply inspection apparatus capable of inspecting a power supply apparatus without stopping the power supply apparatus.

  In order to achieve the above object, a power supply inspection apparatus according to one aspect of the present invention includes a rectifier circuit that rectifies an input three-phase AC voltage, a capacitor that smoothes the output of the rectifier circuit, and a An AC detector that detects an AC component of a charging current of the storage battery of a power supply device that includes a storage battery that is charged with current, and the rectifier circuit is configured to detect the level of the three-phase AC voltage based on the detection result of the AC detector And a determination unit that determines at least one of whether the capacitor operates at a predetermined timing or the capacitance value of the capacitor is a predetermined value.

  ADVANTAGE OF THE INVENTION According to this invention, the power supply inspection apparatus which can test | inspect a power supply device, without stopping a power supply device can be provided.

It is a figure which shows the structure of the direct-current power supply device 10 and the test | inspection apparatus 11 which is one Embodiment of this invention. It is a figure which shows the main waveforms of the power supply device 21 when a rectifier is normal. It is a figure which shows the main waveforms of the power supply device 21 when the thyristor 51 has an open failure. It is a figure which shows the waveform of the charging current Ibat when the capacitance value of the capacitor | condenser 31 falls. It is a figure which shows the functional block which the microcomputer 82 implement | achieves. 4 is a flowchart illustrating an example of a process in which the inspection device 11 inspects whether or not there is an abnormality in the DC power supply device 10. It is a flowchart which shows an example of determination process S106. It is a figure which shows the structure of the DC power supply device 15 which is one Embodiment of this invention.

At least the following matters will become apparent from the description of this specification and the accompanying drawings.
FIG. 1 is a diagram illustrating a configuration of a DC power supply device 10 and an inspection device 11 according to an embodiment of the present invention. The DC power supply device 10 is a device that is provided in, for example, an electric station (not shown) and generates a power supply for operating a load 12 such as a relay from an input three-phase AC voltage. The device 21 is configured to include an ammeter 22 and a current transformer 23.

  The transformer 20 transforms the input three-phase AC voltages Vr, Vs, and Vt, and outputs the three-phase AC voltages Vu, Vv, and Vw.

  The power supply device 21 is a device that generates a desired output voltage Vout from the three-phase AC voltages Vu, Vv, and Vw, and includes a rectifier circuit 30, capacitors 31, 32, an inductor 33, a storage battery 34, a control device 35, and a power line 36. , 37 and distribution circuit breakers 40-45.

  The rectifier circuit 30 is a circuit that rectifies and outputs input three-phase AC voltages Vu, Vv, and Vw, and includes thyristors 50 to 52 and diodes 60 to 62. The thyristors 50 to 52 and the diodes 60 to 62 constitute a so-called bridge circuit.

  The capacitor 31 smoothes the voltage rectified by the rectifier circuit 30. The capacitor 32 and the inductor 33 constitute a so-called LC filter. For this reason, the capacitor 32 outputs a voltage in which noise components included in the charging voltage of the capacitor 31 are suppressed. Note that a charging voltage of the capacitor 32 is an output voltage Vout, and a current output from the capacitor 32 is an output current Iout. One end of the capacitor 32 is connected to the power supply line 36 via the power distribution breaker 40 and the ammeter 22, and the other end of the capacitor 32 is connected to the power supply line 37 via the power distribution breaker 41.

  The storage battery 34 is connected between the power lines 36 and 37. For example, when the three-phase AC voltages Vr, Vs, and Vt are not input to the transformer 20 due to a power failure or the like, a load connected to the power lines 36 and 37 is used. Supply DC power. The storage battery 34 is charged so that the battery voltage Vbat of the storage battery 34 matches the DC level of the output voltage Vout.

  The control device 35 is a device that controls the firing angles of the thyristors 50 to 52 so that the DC level of the output voltage Vout becomes a predetermined level based on the DC level of the output voltage Vout. Although details will be described later, for example, when increasing the level of the output voltage Vout, the control device 35 increases the firing angle of the thyristors 50 to 52 and extends the ON period (operation period) of the thyristors 50 to 52. On the other hand, when lowering the level of the output voltage Vout, the control device 35 reduces the firing angle of the thyristors 50 to 52 and shortens the ON period of the thyristors 50 to 52. Moreover, the control apparatus 35 controls the thyristors 50-52 based on the instruction | indication from the test | inspection apparatus 11, for example. Specifically, when an instruction to evenly charge the storage battery 34 is input from the inspection device 11, the firing angle of the thyristors 50 to 52 is increased so that the DC level of the output voltage Vout increases from the voltage V1 to the voltage V2. To do. As a result, the battery voltage Vbat of the storage battery 34 also increases from the voltage V1 to the voltage V2, so that the storage battery 34 is uniformly charged.

  The distribution circuit breakers 40 and 41 are circuit breakers for protecting the rectifier circuit 30, the capacitors 31 and 32, and the inductor 33 from overcurrent. Each of the power distribution circuit breakers 42 to 45 is a circuit breaker for protecting a connected load from overcurrent. Note that the load 12 is connected between, for example, the power distribution breakers 42 and 43 to be supplied with power of the output voltage Vout.

  The ammeter 22 (DC detection unit) is provided between the power distribution breaker 40 and the power line 36 and measures the output current Iout. The measured current value is output to the inspection apparatus 11 as an analog signal, for example. The ammeter 22 includes a display panel (not shown) that displays the measured current. Note that the direct current component of the current of the capacitor 31 does not flow to the capacitor 32. Therefore, the direct current component of the current of the capacitor 31 matches the direct current component of the output current Iout.

  The current transformer 23 (AC detection unit) detects the AC component of the charging current Ibat of the storage battery 34. The current transformer 23 is an AC current transformer that measures a general AC current. Note that the current transformer 23 is also provided with a display panel (not shown) for displaying the detected AC component, similarly to the ammeter 22.

  The inspection device 11 is an inspection device for inspecting the presence or absence of an abnormality in the DC power supply device 10. The inspection device 11 inspects the presence / absence of an abnormality in the rectifier circuit 30, the capacitor 31, and the control device 35 based on the detection results of the ammeter 22 and the current transformer 23. Although details will be described later, for example, when the rectifier circuit 30 or the capacitor 31 fails, the AC components of the output current Iout and the charging current Ibat increase. Based on such a phenomenon, the inspection device 11 inspects whether the rectifier circuit 30 or the capacitor 31 is abnormal.

  The DC power supply device 10 corresponds to the power supply device, and the inspection device 11, the ammeter 22, and the current transformer 23 correspond to the power supply inspection device.

== Operation of the power supply device 21 ==
Here, when the firing angles of the thyristors 50 to 52 are 180 degrees, when all of the rectifying elements included in the rectifying circuit 30 are normal, and when any one of the rectifying elements has an open failure, for example. The operation of the power supply device 21 will be described. Here, the power supply device 21 supplies power to a resistor (not shown) included in the load 12. That is, in this embodiment, a resistance load is equivalently connected between the distribution circuit breakers 42 and 43.

<< When rectifying element is normal >>
FIG. 2 is a diagram for explaining main waveforms of the power supply device 21 when the firing angles of the thyristors 50 to 52 are 180 degrees and all of the rectifier elements included in the rectifier circuit 30 are normal. . Note that the period from time t0 to t6 is one period of each of the three-phase AC voltages Vu, Vv, and Vw.

  First, at time t0, since the three-phase AC voltage Vu is the highest and the three-phase AC voltage Vv is the lowest, the thyristor 50 and the diode 61 are turned on. Between time t0 and time t1, the difference between the three-phase AC voltages Vu and Vv increases and then decreases. For this reason, the voltage Vc of the capacitor 31 rises from time t0 to the time when the difference between the three-phase AC voltages Vu and Vv becomes the largest, and then falls. At time t1, since the three-phase AC voltage Vw becomes lower than the three-phase AC voltage Vv, the thyristor 50 and the diode 62 are turned on. Between the times t1 and t2, the difference between the three-phase AC voltages Vu and Vw increases and then decreases. For this reason, the voltage Vc rises from time t1 to the time when the difference between the three-phase AC voltages Vu and Vw becomes the largest, and then falls.

  At time t2, since the three-phase AC voltage Vv becomes higher than the three-phase AC voltage Vu, the thyristor 51 and the diode 62 are turned on. Further, the voltage Vc between time t2 and time t3 changes in the same manner as time t0 to time t1. At time t3, the three-phase AC voltage Vu becomes lower than the three-phase AC voltage Vw, so that the thyristor 51 and the diode 60 are turned on. In addition, the voltage Vc from time t3 to t4 changes in the same way as from time t1 to t2.

  At time t4, since the three-phase AC voltage Vw becomes higher than the three-phase AC voltage Vv, the thyristor 52 and the diode 60 are turned on. Further, the voltage Vc between time t4 and t5 changes in the same manner as time t0 to t1. At time t5, since the three-phase AC voltage Vv is the lowest than the three-phase AC voltage Vu, the thyristor 52 and the diode 61 are turned on. In addition, the voltage Vc from time t5 to t6 changes in the same manner as time t0 to t1. Then, after time t6, the operation from time t0 to time t6 is repeated. Thus, when all of the rectifying elements included in the rectifying circuit 30 are normal, the voltage Vc has a waveform obtained by full-wave rectifying the three-phase AC voltages Vu, Vv, and Vw.

  The LC filter composed of the capacitor 32 and the inductor 33 suppresses the noise component of the voltage Vc and is output as the output voltage Vout. For this reason, although the magnitude | size of the alternating current component of the output voltage Vout falls compared with the alternating current component of the voltage Vc, the output voltage Vout changes similarly to the voltage Vc.

  As described above, the load 12 is, for example, a resistance load, and the storage battery 34 can be equivalently approximated as a capacitive load connected between the power supply lines 36 and 37. Therefore, the AC components of the output current Iout and the charging current Ibat change in the same manner as the output voltage Vout.

<< When any one of rectifying elements (thyristor 51) is abnormal >>
FIG. 3 is a diagram for explaining main waveforms of the power supply device 21 when the firing angle of the thyristors 50 to 52 is 180 degrees, and the thyristor 51 has an open failure, for example. The thyristors 50 and 52 operate in the same manner as described with reference to FIG. That is, the voltage Vc during the period from time t0 to t2 when the three-phase AC voltage Vu is highest and the period from time t4 to t6 when the three-phase AC voltage Vw is highest change in the same manner as in FIG. Detailed description is omitted.

  When the thyristor 51 is in an open failure, the three-phase AC voltage Vv becomes the highest, and the thyristor 51 remains off during the time t2 to t4 when the thyristor 51 should be turned on. That is, the thyristor 51 does not operate (turns on) at a predetermined timing according to the levels of the three-phase AC voltages Vu, Vv, Vw. As a result, the voltage Vc decreases between times t2 and t4, and the output voltage Vout similarly decreases. Therefore, the AC components of the output current Iout and the charging current Ibat increase as compared with the case where the rectifying element is normal.

  Here, the case where an open failure occurs in the thyristor 51 has been described, but the same applies to the case where another rectifier element (for example, the thyristor 50, the diode 60, or the like) has an open failure. Further, the output current Iout and the charging current Ibat when the control device 35 breaks down and the thyristor 51 cannot be turned on also change as in the case shown in FIG. That is, when the rectifying element fails to open or the control device 35 fails and the thyristors 50 to 52 cannot be turned on, the AC components of the output current Iout and the charging current Ibat increase.

  Although the case where the firing angle is 180 degrees has been described here, the AC components of the output current Iout and the charging current Ibat increase even when the firing angle is not 180 degrees.

<< When the capacitance of the capacitor 31 decreases >>
In addition, changes in the output current Iout and the charging current Ibat when the capacitance value of the capacitor 31 decreases due to secular change or the like will be described with reference to FIGS. 1 and 4.

  When the capacitance value of the capacitor 31 decreases from a predetermined value due to aging or the like, the impedance of the capacitor 31 increases, so that the ripple current generated in the rectifier circuit 30 is difficult to flow through the capacitor 31. Therefore, when the capacitance value of the capacitor 31 decreases, the AC components of the output current Iout and the charging current Ibat increase as a result. Note that the magnitudes of the AC components of the output current Iout and the charging current Ibat increase as the capacitance value of the capacitor 31 decreases.

  Thus, in the DC power supply device 10, for example, when an open circuit failure occurs in the capacitor 31 or an open circuit failure occurs in the rectifier element, the magnitudes of the AC components of the output current Iout and the charging current Ibat increase. .

== Details of Inspection Device 11 ==
Here, details of the inspection apparatus 11 shown in FIG. 1 will be described. The inspection device 11 inspects whether the rectifier circuit 30, the capacitor 31, and the control device 35 are abnormal based on the output current Iout and the charging current Ibat.

  The inspection device 11 includes an AD converter (ADC) 80, a storage device 81, a microcomputer 82, an interface circuit (IF) 83, a display 84, and an input device 85.

  The AD converter 80 converts the analog output current Iout measured by the ammeter 22 and the AC component of the analog charging current Ibat detected by the current transformer 23 into a digital value. The storage device 81 stores program data executed by the microcomputer 82 and various data.

  The microcomputer 82 implements various functions by executing the program data stored in the storage device 81. Specifically, the microcomputer 82 implements the functions of a calculation unit 90, a determination unit 91, and a processing unit 92 as shown in FIG.

  The calculating unit 90 performs a predetermined calculation based on the digitized output current Iout and charging current Ibat. Specifically, the calculation unit 90 calculates the ratio between the direct current component of the output current Iout and the alternating current component of the charging current Ibat. Here, the ratio of the DC component to the AC component is, for example, the average value of the output current Iout in the period per cycle of the three-phase AC voltage Vu and the charge in the period per cycle of the three-phase AC voltage Vu. It is a ratio with the effective value of the ripple component of the current Ibat. Then, the calculation unit 90 calculates the ratio between the two by dividing the AC component of the charging current Ibat by the DC component of the output current Iout. Therefore, when only the magnitude of the AC component increases, the ratio (AC component / DC component) increases.

  The determination unit 91 determines whether or not there is an abnormality in the rectifier circuit 30, the capacitor 31, and the control device 35 based on the ratio calculated by the calculation unit 90. By the way, the magnitude of the AC component of the charging current Ibat differs depending on the failure location as shown in FIGS. In the present embodiment, a ratio obtained experimentally in each case where only the capacitor 31 has an open failure and when any one of the rectifying elements of the rectifier circuit 30 has an open failure is stored in the storage device 81, for example. I will do it. Then, the determination unit 91 determines an abnormality in the rectifier circuit 30 or the like by comparing the experimentally obtained ratio stored in the storage device 81 with the ratio calculated by the calculation unit 90. Here, the ratio obtained when only the capacitor 31 has an open failure is, for example, “0.1” (10%), and the ratio obtained when any one of the rectifying elements of the rectifier circuit 30 has an open failure. Is, for example, “0.6” (60%). For this reason, when the ratio calculated by the calculation unit 90 is higher than “0.1” (predetermined value), for example, the capacity of the capacitor 31 is not a predetermined value but lower than a predetermined value, or It can be specified that the rectifier circuit 30 is not operating at a predetermined timing. For this reason, the determination unit 91 determines that at least one of the capacitor 31, the rectifier circuit 30, and the control device 35 is abnormal. Further, when the ratio calculated by the calculation unit 90 is higher than “0.6”, for example, the rectifying element of the rectifying circuit 30 is not operating at a predetermined timing according to the three-phase AC voltages Vu, Vv, and Vw. Can be identified. In such a case, the determination unit 91 determines that the rectifier circuit 30 is not operating at a predetermined timing and the rectifier circuit 30 or the control device 35 is abnormal.

  The processing unit 92 (signal output unit) acquires the measurement result of the output current Iout, and when the level of the direct current component of the output current Iout is lower than a predetermined value, the processing unit 92 (signal output unit) issues an equal charge instruction for starting the equal charge of the storage battery 34. And output to the control device 35 via the interface circuit 83. In addition, when the equal charge of the storage battery 34 is started, the firing angle of the thyristors 50 to 52 is increased as described above, so that the DC component of the output current Iout is increased. Further, the processing unit 92 causes the display 84 to display the waveform of the output current Iout, the waveform of the AC component of the charging current Ibat, and the ratio calculated by the calculation unit 90. When the determination unit 91 determines that there is an abnormality in the rectifier circuit 30 or the like, the processing unit 92 records the waveform of the output current Iout, the ratio calculated by the calculation unit 90, the determined time, and the like in the storage device 81, Information indicating that the DC power supply device 10 is abnormal is displayed on the display 84. Further, when the determination unit 91 determines that there is an abnormality in the rectifier circuit 30 or the like, the processing unit 92 outputs an alarm indicating that there is an abnormality to the interface circuit 83.

  The interface circuit 83 exchanges various data between the microcomputer 82, the display device 84, and the input device 85. Further, the interface circuit 83 outputs an equal charge instruction to the control device 35 based on an instruction from the processing unit 92 and outputs an alarm to the outside.

  The indicator 84 is a display panel that displays a waveform of the output current Iout, a ratio calculated by the calculation unit 90, and alarm information indicating that the DC power supply device 10 is not normal. For this reason, for example, the user can determine the presence or absence of abnormality of the DC power supply device 10 by confirming the output current Iout waveform of the panel of the display 84 and the alarm information.

  The input device 85 is, for example, a keyboard for setting a measurement result displayed on the ammeter 22 and a detection result displayed on the current transformer 23 to the detection device 11 by the user. The detection result and the like set via the input device 85 are transmitted to the microcomputer 82 via the interface circuit 83. For this reason, for example, even when there is no signal output from the ammeter 22 or the current transformer 23, the microcomputer 82 can acquire the measurement result of the ammeter 22 and the like.

== Example of processing of inspection apparatus 11 ==
Here, an example of a process in which the inspection apparatus 11 inspects whether or not the DC power supply apparatus 10 has an abnormality will be described with reference to FIG. For example, the inspection apparatus 11 performs the process illustrated in FIG. 6 at predetermined intervals. 6 is a functional block realized by the microcomputer 82. In the flowchart of FIG.

  First, the processing unit 92 acquires the measurement result of the output current Iout (S100). Then, the processing unit 92 determines whether or not the level of the direct current component of the output current Iout is greater than or equal to a predetermined level (S101). Note that the level of the DC component corresponds to, for example, the average value of the output current Iout in the period per cycle of the three-phase AC voltage Vu described above. When the level of the DC component is equal to or higher than the predetermined level (S101: YES), the calculation unit 90 calculates the ratio between the DC component of the output current Iout output from the AD converter 80 and the AC component of the charging current Ibat. (S104).

  On the other hand, when the level of the DC component of the output current Iout is not equal to or higher than the predetermined level (S101: NO), the processing unit 92 outputs an equal charge instruction to start equal charge of the storage battery 34 (S102). When the process S102 is executed, since the equal charge of the storage battery 34 is started, the output current Iout and the charging current Ibat start to increase. Then, when a certain time (for example, 5 to 10 seconds) required for the output current Iout to sufficiently increase has elapsed (S103: YES), the processing unit 92 causes the calculation unit 90 to store the DC component of the output current Iout and the charge. The ratio of the current Ibat to the AC component is calculated (S104).

  When the process S104 is executed, the processing unit 92 causes the display 84 to display the waveforms of the output current Iout and the charging current Ibat and the ratio of the direct current component to the alternating current component calculated by the calculation unit 90 (S105). ). And the determination part 91 performs the determination process whether the rectifier circuit 30, the capacitor | condenser 31, and the control apparatus 35 have abnormality based on the ratio which the calculation part 90 calculated (S106).

  Here, the determination process S106 is, for example, a process as shown in FIG. Details of the determination process will be described below. First, the determination unit 91 determines whether or not the ratio calculated by the calculation unit 90 is higher than “0.1”, which is a ratio when only the capacitor 31 has an open failure (S200). When the calculated ratio is lower than “0.1” (S200: NO), the determination unit 91 determines that there is no abnormality in the DC power supply device 10 (S201). On the other hand, when the calculated ratio is higher than “0.1” (S200: YES), the determination unit 91 determines that the calculated ratio is a ratio when any one of the rectifying elements has an open failure “0. It is determined whether it is higher than 6 ″ (S202). When the calculated ratio is higher than “0.6” (S202: YES), the determination unit 91 determines that there is an abnormality in the rectifier circuit 30 or the control device 35 (S203). In this way, in the DC power supply device 10, it is possible to specify a location where there is an abnormality. On the other hand, when the calculated ratio is lower than “0.6” (S202: NO), the determination unit 91 determines that the capacitor 31 is abnormal (S204).

  Then, as shown in FIG. 6, when the determination unit 91 determines that there is an abnormality (S107: YES), the processing unit 92 displays the waveform of the output current Iout and the charging current Ibat, the determined time, the calculated ratio, and the like. Record in the storage device 81. Further, the processing unit 92 displays an alarm indicating that there is an abnormality on the display device 84 and outputs the alarm (S108). On the other hand, when the determination unit 91 determines that there is no abnormality (S107: NO), the process ends.

== About DC Power Supply Device 15 ==
Here, with reference to FIG. 8, a DC power supply device 15 according to an embodiment of the present invention will be described. The DC power supply device 15 is a device that is provided in, for example, an electric station (not shown) and generates a power supply for operating a load 12 such as a relay from an input three-phase AC voltage. A device 21, a current transformer 100, and an inspection device 110 are included. In addition, the block to which the same code | symbol is attached | subjected with the DC power supply device 15 and the DC power supply device 10 shown in FIG. 1 is the same. In the DC power supply device 15, a current transformer 100 is provided instead of the ammeter 22 and the current transformer 23 included in the DC power supply device 10. Further, the DC power supply device 15 includes an inspection device 110 inside. Here, the current transformer 100 and the inspection device 110 will be described.

  The current transformer 100 is a so-called DC current transformer that detects a DC component and an AC component of the charging current Ibat. The current transformer 100 corresponds to an AC detection unit and a DC detection unit.

  The inspection device 110 is a device that inspects whether the power supply device 21 is abnormal based on the detection result of the current transformer 100. Each block included in the inspection apparatus 110 is the same as each block included in the inspection apparatus 11. For this reason, the microcomputer 82 of the inspection apparatus 110 executes processing as shown in FIGS. 6 and 7 based on the direct current component and the alternating current component of the charging current Ibat. At this time, the DC component of the charging current Ibat is used instead of the DC component of the output current Iout. As a result, even when the inspection device 110 is configured to be provided inside the DC power supply device 15, the inspection device 110 can determine the presence / absence of an abnormality in the rectifier circuit 30, the capacitor 31, and the like. .

  The inspection apparatuses 11 and 110 of the present embodiment have been described above. In the present embodiment, for example, it is determined whether or not there is an abnormality in the rectifier circuit 30 or the like based on the ratio of the output current Iout DC component and the AC component of the charging current Ibat. However, for example, as shown in FIG. 3, when the rectifier circuit 30 does not operate at a predetermined timing corresponding to the three-phase AC voltages Vr, Vs, and Vt, the AC component (ripple component) of the charging current Ibat increases. . Further, as shown in FIG. 4, when the capacitance value of the capacitor 31 is reduced from a predetermined value (for example, a value at the time of shipment), the AC component of the charging current Ibat increases. For this reason, for example, the inspection apparatus 11 may determine the presence or absence of abnormality based only on the magnitude of the AC component of the charging current Ibat. Specifically, for this reason, if the magnitude of the alternating current component of the charging current Ibat becomes higher than a predetermined value when the rectifier circuit 30 or the like is normal, the rectifier circuit 30 or the like is not operating at a predetermined timing. Can be determined. As described above, in the present embodiment, it is possible to detect an abnormality of the DC power supply device 10 without stopping the DC power supply device 10. When an abnormality is detected, the user can stop the DC power supply device 10 and replace a failed element or the like. Thus, since it is possible to prevent the DC power supply device 10 from operating in a broken state, the burden on the DC power supply device 10 can be reduced. Furthermore, when the failed element is replaced, the ripple current in the output current Iout becomes small. For this reason, the influence on the load driven by the DC power supply device 10 is also reduced.

  Generally, when the load of the DC power supply device 10 is small, the change in the AC component of the charging current Ibat is small. For this reason, it may be difficult to detect an abnormality in the rectifier circuit 30 or the like based only on the AC component of the charging current Ibat. The calculation unit 90 of the present embodiment determines an abnormality in the rectifier circuit 30 and the like based on the ratio of the direct current component of the output current Iout and the alternating current component of the charging current Ibat (for example, processing S200). Therefore, for example, the determination can be made with higher accuracy than in the case of determining abnormality based only on the AC component of the charging current Ibat.

  Further, the AC component of the charging current Ibat increases due to an open failure of the capacitor 31 or an open failure of the rectifier element of the rectifier circuit 30. Furthermore, the alternating current component of the charging current Ibat is larger when the rectifying element has an open failure than when the capacitor 31 has an open failure.

Based on such a phenomenon, the determination unit 91 determines that the capacitance value of the capacitor 31 is higher when the ratio calculated by the calculation unit 90 is higher than “0.1”, which is a ratio when the capacitor 31 has an open failure. Or whether the rectifier circuit 30 is not operating at a predetermined timing (for example, S200: YES).

  Further, the calculation unit 90 calculates the ratio between the direct current component of the output current Iout and the alternating current component of the charging current Ibat while the storage battery 34 is charged uniformly and rises from the voltage V1 to the voltage V2 (for example, , Processing S102 to S104). For this reason, in this embodiment, for example, the output current Iout can be increased regardless of the load driven by the DC power supply device 10. And the determination part 91 determines abnormality of the rectifier circuit 30 grade | etc., Based on the output current Iout when the output current Iout increases, and the charging current Ibat. For this reason, in this embodiment, determination accuracy can be improved compared with the case where it does not charge equally, for example.

  For example, in a state where the storage battery 34 is charged, the DC component of the charging current Ibat changes in the same manner as the output current Iout. For this reason, the inspection apparatus 110 can also determine the presence or absence of an abnormality in the rectifier circuit 30 or the like based on, for example, the ratio of the direct current component to the alternating current component of the charging current Ibat.

  Further, the determination unit 91 of the inspection apparatus 110 compares the ratio of the direct current component to the alternating current component of the charging current Ibat with, for example, the above-described “0.1” or “0.6”, thereby making the direct current power supply device 15 It becomes possible to specify the failure location in.

  Further, the direct current component of the charging current Ibat may be very small during a period when the storage battery 34 is not charged. However, the calculation unit 90 of the inspection device 110 calculates the ratio of the charging current Ibat while the storage battery 34 is being charged uniformly. For this reason, the determination unit 91 of the inspection apparatus 110 can accurately determine whether there is an abnormality in the rectifier circuit 30 or the like.

  Further, when the determination unit 91 determines that the rectifier circuit 30 or the like is abnormal, the processing unit 92 outputs an alarm indicating that the DC power supply device 10 is not normal. Further, when the determination unit 91 determines that the rectifier circuit 30 or the like is abnormal, the display device 84 displays alarm information indicating that the DC power supply device 10 is not normal. For this reason, the user can immediately know that the DC power supply device 10 is abnormal.

  In the inspection apparatus 11, the result from the ammeter 22 or the like is input to the AD converter 80, but is not limited thereto. For example, the user reads the value of the current transformer 23 and based on the result of the AC component of the charging current Ibat, the rectifier circuit 30 is operating at a predetermined timing, or the capacitance value of the capacitor 31 is a predetermined value. It may be determined whether or not.

  The inspection apparatus 11 is a so-called portable inspection apparatus. However, for example, as illustrated in FIG. 8, the inspection apparatus 11 may be configured to be provided inside the DC power supply apparatus 15, such as a DC power supply apparatus 15.

  The above-described embodiment is intended to facilitate understanding of the present invention, and is not intended to limit the present invention. The present invention is changed and improved without departing from the gist thereof, and the present invention includes equivalents thereof.

  For example, the rectifier circuit 30 may be configured entirely with diodes or may be configured with all thyristors. The rectifier circuit 30 may be a half-wave rectifier circuit.

  Further, in the present embodiment, the calculation unit 90 calculates the ratio between the direct current component and the alternating current component after a predetermined time has elapsed (for example, after 5 to 10) from the start of the uniform charging, but is not limited thereto. For example, the calculation unit 90 may calculate the ratio when the charging current Ibat at the time of uniform charging exceeds a predetermined current. Further, when the battery is evenly charged, the charging current Ibat increases and then decreases. For this reason, the calculation unit 90 may store, for example, data on the charging current Ibat in the storage device 81, obtain the current value before the charging current Ibat starts to decrease, and calculate the ratio.

  In addition, for example, when the control device 35 capable of starting the equal charge manually is used, the process corresponding to the processes S104 to S106 is executed after the user appropriately starts the equal charge. Also good.

  In the present embodiment, the value such as “0.1”, which is a ratio when the capacitor 31 has an open failure, is an experimentally obtained value. Also good.

  Further, for example, the processing unit 92 outputs different alarms when it is determined that the capacitor 31 is abnormal (S204) and when it is determined that the rectifier circuit 30 is abnormal (S203). May be.

10, 15 DC power supply device 11, 110 Inspection device 12 Load 20 Transformer 21 Power supply device 22 Ammeter 23,100 Current transformer
DESCRIPTION OF SYMBOLS 30 Rectifier circuit 31,32 Capacitor 33 Inductor 34 Storage battery 35 Control apparatus 36,37 Power supply line 40-45 Power distribution breaker 50-52 Thyristor 60-62 Diode 80 AD converter 81 Memory | storage device 82 Microcomputer 83 Interface circuit 84 Display 85 Input Device 90 Calculation unit 91 Determination unit 92 Processing unit

Claims (11)

An AC component of the charging current of the storage battery of the power supply device comprising: a rectifying circuit that rectifies an input three-phase AC voltage; a capacitor that smoothes the output of the rectifying circuit; and a storage battery that is charged with a current from the capacitor. An AC detector for detecting
Based on the detection result of the AC detection unit, at least any of whether the rectifier circuit operates at a predetermined timing according to the level of the three-phase AC voltage, or the capacitance value of the capacitor is a predetermined value. A determination unit for determining one of them;
A power supply inspection device comprising: The power supply inspection device according to claim 1,
A direct current detector for detecting a direct current component of the current from the capacitor;
A calculation unit that calculates a ratio between the DC component of the charging current detected by the DC detection unit and the AC component of the charging current detected by the AC detection unit;
Further comprising
The determination unit
Based on the calculation result of the calculation unit, the rectifier circuit operates at a predetermined timing according to the level of the three-phase AC voltage, or at least one of the capacitance value of the capacitor is a predetermined value. Judging one,
Power supply inspection device characterized by The power supply inspection device according to claim 2,
The calculation unit includes:
Calculate the ratio that increases as the magnitude of the AC component increases,
The determination unit
When the ratio calculated by the calculation unit is higher than a predetermined value, the rectifier circuit is not operating at a predetermined timing according to the level of the three-phase AC voltage, or the capacitance value of the capacitor is not a predetermined value. Or at least one of them,
Power supply inspection device characterized by The power supply inspection device according to claim 2 or claim 3,
The calculation unit includes:
Calculating the ratio of the DC component of the charging current and the AC component of the charging current while the charging voltage of the storage battery is rising from the first level to the second level;
Power supply inspection device characterized by The power supply inspection device according to claim 1,
A direct current detector for detecting a direct current component of the charging current;
A calculation unit that calculates a ratio between the DC component of the charging current detected by the DC detection unit and the AC component of the charging current detected by the AC detection unit;
Further comprising
The determination unit
Based on the calculation result of the calculation unit, the rectifier circuit operates at a predetermined timing according to the level of the three-phase AC voltage, or at least one of the capacitance value of the capacitor is a predetermined value. Judging one,
Power supply inspection device characterized by The power supply inspection device according to claim 5,
The calculation unit includes:
Calculate the ratio that increases as the magnitude of the AC component increases,
The determination unit
When the ratio calculated by the calculation unit is higher than a predetermined value, the rectifier circuit is not operating at a predetermined timing according to the level of the three-phase AC voltage, or the capacitance value of the capacitor is not a predetermined value. Or at least one of them,
Power supply inspection device characterized by The power supply inspection device according to claim 5 or 6,
The calculation unit includes:
Calculating the ratio of the DC component of the charging current and the AC component of the charging current while the charging voltage of the storage battery is rising from the first level to the second level;
Power supply inspection device characterized by It is a power supply inspection device as described in any one of Claims 1-7,
When the determination unit is at least one of the rectifier circuit not operating at a predetermined timing according to the level of the three-phase AC voltage, or the capacitance value of the capacitor is not a predetermined value. And determining, further comprising a signal output unit for outputting a signal indicating that the power supply device is not normal,
Power supply inspection device characterized by The power supply inspection device according to claim 1,
When the determination unit is at least one of the rectifier circuit not operating at a predetermined timing according to the level of the three-phase AC voltage, or the capacitance value of the capacitor is not a predetermined value. And determining, further comprising a display device for displaying information indicating that the power supply device is not normal,
Power supply inspection device characterized by An AC component of the charging current of the storage battery of the power supply device comprising: a rectifying circuit that rectifies an input three-phase AC voltage; a capacitor that smoothes the output of the rectifying circuit; and a storage battery that is charged with a current from the capacitor. Detect
Based on the detection result of the AC detection unit, at least any of whether the rectifier circuit operates at a predetermined timing according to the level of the three-phase AC voltage, or the capacitance value of the capacitor is a predetermined value. Judging either
Power supply inspection method characterized by. A rectifier circuit for rectifying the input three-phase AC voltage;
A capacitor for smoothing the output of the rectifier circuit;
A storage battery charged with current from the capacitor;
Based on the charging current of the storage battery, the rectifier circuit operates at a predetermined timing corresponding to the level of the three-phase AC voltage, or at least one of the capacitance value of the capacitor is a predetermined value. An inspection device for determining
With
The inspection device includes:
An AC detector for detecting an AC component of the charging current;
Based on the detection result of the AC detection unit, at least any of whether the rectifier circuit operates at a predetermined timing according to the level of the three-phase AC voltage, or the capacitance value of the capacitor is a predetermined value. A determination unit for determining one of them;
A power supply device comprising:

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