Power supply device and power supply device test method

Abstract

To provide a power source device and a power source device testing method in which cost is not increased.SOLUTION: A power source device 1 includes: a power source unit 10 that outputs power to a power source line 13 formed of a positive electrode 13P and a negative electrode 13N; and a casing 30 that houses the power source unit 10 and is a ground potential. The power source unit 10 includes: Y capacitors 14B and 14C that are disposed between the positive and negative electrodes and the casing; a connection terminal 40 that is connected to the Y capacitors 14B and 14C and is disposed with a non-conductive gap provided relative to the casing 30; and conduction means 44 that is attachable / detachable to / from the outside of the casing 30 and provides electrical conduction between the casing 30 and the connection terminal 40 while being mounted on the casing 30 and connecting to the gap.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a power supply device that supplies power and a method for testing a power supply device. [Background technology]

[0002] A common noise countermeasure for power supply devices that supply power to a load is to install a Y capacitor in the power supply line. When a dielectric strength test is performed on such a power supply device, the test results may not be normal because current flows from the power supply line through the Y capacitor to the earth potential of the housing, etc.

[0003] Patent Document 1 discloses a configuration in which a switching relay and a positive temperature coefficient thermistor are provided between the Y capacitor and the earth, thereby suppressing the current flowing through the Y capacitor. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2020-156139 Summary of the Invention [Problem to be solved by the invention]

[0005] In the above-mentioned conventional technology, current flows through the Y capacitor via the thermistor, so the Y capacitor must be selected in consideration of its withstand voltage in preparation for testing, which increases costs. Furthermore, there was also the problem of increased costs due to the increased number of components, such as thermistors and relays.

[0006] The present invention has been made in view of the above problems, and has as its object to provide a power supply device and a method for testing a power supply device that does not increase costs. [Means for solving the problem]

[0007] According to one embodiment of the present invention, the present invention is applied to a power supply device that supplies power to a load. The power supply device includes a power supply unit that outputs power to a power line consisting of a positive electrode and a negative electrode, and a housing that houses the power supply unit and is at ground potential. The power supply unit includes a set of Y capacitors interposed between the positive electrode and the negative electrode and the housing, connection terminals connected to the Y capacitors and disposed with a non-conductive gap relative to the housing, and conductive means that is detachable from the outside of the housing and that fills the gap when attached to the housing to electrically connect the housing and the connection terminals. The gap is formed as a gap capable of holding an insulator, and the conductive means is attached with the insulator removed to the outside of the housing. [Effects of the Invention]

[0008] According to the present invention, the connection terminal disposed between the Y capacitor and the housing can be switched between a state insulated from the ground potential by having a gap therebetween and a state in which the conductive means is fixed and conductive to the ground potential. With this configuration, for example, when conducting a dielectric strength voltage test, the connection terminal can be kept in a state insulated from the ground potential, and the Y capacitor can be connected to the ground potential after the test. This eliminates the need to significantly increase the number of components or increase the resistance of the Y capacitor for the test, thereby suppressing increases in costs. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is an explanatory diagram of a power supply device according to an embodiment of the present invention. [Figure 2] FIG. 2 is an explanatory diagram showing a dielectric strength test of a power supply device. [Figure 3] FIG. 3 is a perspective view of the power supply device. [Figure 4] FIG. 4 is an exploded perspective view of the power supply device as viewed from the bottom side. [Figure 5] FIG. 5 is a cross-sectional view of the power supply device. [Figure 6A] FIG. 6A is an explanatory diagram of a connection terminal. [Figure 6B] FIG. 6B is an explanatory diagram of the connection terminal. [Figure 6C] FIG. 6C is an explanatory diagram of a connection terminal. [Figure 7]FIG. 7 is a flowchart of the dielectric strength test. [Figure 8] FIG. 8 is an explanatory diagram of a power supply device according to a modified example of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0011] FIG. 1 is an explanatory diagram of a power supply device 1 according to an embodiment of the present invention.

[0012] The power supply device 1 is configured to include a power supply section 10, a load 20, and a housing 30.

[0013] The power supply unit 10 is composed of a power supply circuit 11 and a filter circuit 14 .

[0014] The power supply circuit 11 includes a battery 12 and a power supply line 13 consisting of a positive electrode 13P and a negative electrode 13N. The power supply circuit 11 outputs DC power supplied from the battery 12 to a load 20 via the power supply line 13.

[0015] The filter circuit 14 reduces normal mode noise and common mode noise contained in the direct current output from the power supply circuit 11 to the load 20.

[0016] The filter circuit 14 includes an X capacitor 14A arranged between the positive electrode 13P and the negative electrode 13N, and a Y capacitor 14B and a Y capacitor 14C arranged between the positive electrode 13P and the housing 30 and between the negative electrode 13N and the housing 30, respectively.

[0017] The X capacitor 14A reduces normal mode noise superimposed between the positive electrode 13P and the negative electrode 13N of the power supply line 13.

[0018] Y capacitor 14B has a positive electrode connected to positive electrode 13P and a ground electrode connected to connection terminal 40, and Y capacitor 14C has a positive electrode connected to negative electrode 13N and a ground electrode connected to connection terminal 40. As will be described in detail later, connection terminal 40 has the same potential as housing 30, i.e., ground potential, when connected to housing 30. Y capacitors 14B and 14C reduce common mode noise on power supply line 13 relative to the ground potential.

[0019] The X capacitor 14A, the Y capacitor 14B, and the Y capacitor 14C are housed in the housing 30 as an integrally molded capacitor module 14M.

[0020] The load 20 includes a motor 2 and an inverter circuit 21 that supplies power to the motor 2.

[0021] The inverter circuit 21 converts the DC current supplied from the power supply circuit 11 into AC power and outputs it to the motor 2. The inverter circuit 21 also converts the regenerative power of the motor 2 into DC current and outputs it to the power supply circuit 11.

[0022] The inverter circuit 21 includes switching elements 21u1 and 21u2 corresponding to the U phase of the motor 2, switching elements 21v1 and 21v2 corresponding to the V phase, and switching elements 21w1 and 21w2 corresponding to the W phase.

[0023] The inverter circuit 21 is housed in the housing 30 as an inverter module 21M in which these switching elements are integrally molded.

[0024] In this embodiment, the load 20 is described as being configured by the inverter circuit 21 and the motor 2, but is not limited to this. Any load may be used as long as it is supplied with direct current from the power supply circuit 11.

[0025] The housing 30 houses the power supply unit 10 and the load 20. The housing 30 serves as a reference potential (earth potential) for the power supply unit 10 and the load 20.

[0026] In this embodiment, as will be described later with reference to Fig. 3, a configuration will be described in which the filter circuit 14 and the inverter circuit 21 of the power supply unit 10 are housed in a housing 30. That is, the power supply circuit 11 is configured so that DC power is supplied to a power supply line 13 inside the housing 30 from a battery provided outside the housing 30 via cables, connectors, etc. Furthermore, the power output from the inverter circuit 21 is supplied to a motor 2 arranged outside the housing 30 via cables, connectors, etc.

[0027] However, this configuration is not necessarily required, and the battery 12 may be arranged inside the housing 30, or the inverter circuit 21 (that is, the load) may be arranged outside the housing 30.

[0028] Next, the dielectric strength test will be described.

[0029] FIG. 2 is an explanatory diagram for carrying out a dielectric strength voltage test.

[0030] The dielectric strength test is a test to measure whether an electrical device has sufficient insulation from the ground potential. As shown in Fig. 2, the dielectric strength test involves shorting the positive and negative terminals of a power supply line 13, connecting probes of a test device 100 to the power supply line 13 and the ground potential, respectively, applying an AC current (e.g., 50 Hz, 2000 V) from the test device 100 for a predetermined time (e.g., 60 seconds), detecting the current flowing during that time, and measuring the electrical characteristics. Based on the measurement results, the dielectric strength test is evaluated.

[0031] Here, a case where connection terminal 40 described in this embodiment is connected to housing 30 (ground potential) as in a conventional general power supply device during a dielectric strength test will be described with reference to Fig. 2. In this case, the ground side electrode of the Y capacitor is electrically connected to the ground potential of the housing, so that during the test, a current applied from the test equipment flows from the power line via the Y capacitor to the ground potential, as shown by the dotted line in Fig. 2. This current may be several hundred mA depending on the capacitance of the Y capacitor, and if the test equipment detects this, it may diagnose the test result as being bad.

[0032] Furthermore, the withstand voltage (e.g., 600 V) of the Y capacitor is generally set based on the voltage (e.g., 450 V) of the power supply circuit 11. Therefore, if a current of several thousand volts is applied during testing, the withstand voltage of the Y capacitor may be exceeded, causing the Y capacitor to fail. To prevent this, the withstand voltage of the Y capacitor can be set higher, but this increases the size and cost of the Y capacitor.

[0033] Therefore, in this embodiment, as explained in Figure 1, the connection terminal 40 is arranged with a non-conductive gap from the housing 30 so that it is not affected by the Y capacitors 14B and 14C during the dielectric strength voltage test.

[0034] 3 to 5 are explanatory diagrams of the power supply circuit 11 of this embodiment. Fig. 3 is a perspective view of the power supply circuit 11, Fig. 4 is an exploded perspective view of the power supply circuit 11 as viewed from the bottom side, and Fig. 5 is a VV cross-sectional view of Fig. 3.

[0035] 3 and 4, the housing 30 is composed of a box-shaped main body 32 with an open bottom side, and a bottom 33 configured to close the open portion on the bottom side of the main body 32. The bottom 33 and the main body 32 have a plurality of fixing holes 31 on their outer edges, and are fixed by fastening fixing members (e.g., bolts) into the fixing holes 31. The main body 32 and the bottom 33 are made of a conductive metal material such as an aluminum alloy.

[0036] A cooling water inlet 35 that introduces cooling water into a cooling water flow path 38 inside the housing 30 and a cooling water outlet 36 that discharges cooling water from the cooling water flow path 38 are protruded from the bottom surface of the housing 30. Cutouts 35A and 36A are formed in the bottom 33 to avoid the cooling water inlet 35 and the cooling water outlet 36, respectively.

[0037] 4, a resin plate 37, a capacitor module 14M, an inverter module 21M, etc. are housed in a main body 32 of a housing 30. The capacitor module 14M and the inverter module 21M are fixed onto the resin plate 37 and housed in the main body 32. A cooling water flow path 38 is formed inside the resin plate 37, and the capacitor module 14M and the inverter module 21M are cooled by cooling water.

[0038] A connection terminal 40 is provided standing on the bottom surface of the capacitor module 14M.

[0039] As shown in the cross-sectional view of Fig. 5, one end of connection terminal 40 is fixed to bus bar 140 extending from capacitor module 14M. Bus bar 140 is connected to the ground electrodes of Y capacitors 14B and 14C inside capacitor module 14M. The other end of connection terminal 40 on the bottom side is disposed with a non-conductive gap (e.g., 1 mm) between it and bottom 33. As shown in Fig. 4, connection terminal 40 is disposed on the outer edge of housing 30, for example, adjacent to fixing hole 31 that fixes main body 32 and bottom 33.

[0040] An insulator 200 is sandwiched in the gap between the connection terminal 40 and the bottom 33. The insulator 200 has a flexible tape-like shape. The insulator 200 is made of an electrically insulating sheet-like material, such as Kapton tape ("Kapton" is a registered trademark of DuPont) or motor insulating paper. By sandwiching the insulator 200 in the gap between the connection terminal 40 and the bottom 33 in this way, the degree of insulation between the connection terminal 40 and the bottom 33 is increased. Note that even in a dielectric strength test, if the connection terminal 40 and the bottom 33 have a sufficient degree of insulation, it is not necessary to place the insulator 200 inside the housing 30.

[0041] The insulator 200 is sandwiched in the gap between the connection terminal 40 and the bottom 33, and one end thereof extends to the outside of the housing 30 through a gap between the notch 36A of the bottom 33 and the cooling water outlet 36. A slight gap is left between the notch 36A (or notch 35A) of the bottom 33 and the cooling water outlet 36 (or cooling water inlet 35) even when the bottom 33 is fixed to the main body 32. Therefore, by utilizing this gap, the insulator 200 can be extended to the outside of the housing 30 without providing a new structure.

[0042] Since the insulator 200 is extended to the outside of the housing 30 in this manner, as will be described later, the insulator 200 can be easily removed from between the connection terminal 40 and the bottom 33 by pulling out the insulator 200 after the dielectric strength voltage test is completed.

[0043] The bottom portion 33 has a hole 33A formed therethrough at a position where the connection terminal 40 will be located when the bottom portion 33 is fixed to the main body portion 32.

[0044] A screw hole 41 is formed in the connection terminal 40. The connection terminal 40 is configured so that, with the bottom portion 33 fixed to the main body portion 32, the fastening bolt 44 can be fastened to the connection terminal 40 by inserting the fastening bolt 44 from the outside of the bottom portion 33 through the hole portion 33A.

[0045] 6A, 6B, and 6C are explanatory diagrams illustrating the change from an insulating state to a conductive state between the connection terminal 40 and the bottom part 33 of the housing 30. FIG.

[0046] In the fully assembled state of power supply device 1, as shown in FIG. 6A, insulator 200 is sandwiched between connection terminal 40 and bottom 33. Insulator 200 extends from the gap between cutout 36A in bottom 33 and cooling water outlet 36 to the outside of housing 30. Fastening bolt 44 is not connected to connection terminal 40. In this state, connection terminal 40, i.e., the ground side of Y capacitors 14B and 14C, is insulated from housing 30, i.e., the ground potential. A dielectric strength test is performed in this state.

[0047] After the dielectric strength test is completed, in order to connect the connection terminal 40 to the ground potential, the insulator 200 is first pulled out to the outside of the housing 30 as shown in FIG. 6B.

[0048] Next, as shown in FIG. 6C, fastening bolt 44 is inserted from the outside of bottom portion 33 through hole portion 33A, and fastened to screw hole 41 of connection terminal 40.

[0049] When the fastening bolt 44 is fastened into the screw hole 41, the bottom 33 and the fastening bolt 44, and the fastening bolt 44 and the connection terminal 40 come into contact with each other. This electrically connects the connection terminal 40 to the bottom 33, so that the ground electrodes of the Y capacitors 14B and 14C are at ground potential via the connection terminal 40. With this configuration, the fastening bolt 44 serves as a conductive means.

[0050] In this way, the connection terminals 40 provided on the ground side of the Y capacitors 14B and 14C are configured to be detachably connected to the ground potential by the fastening bolts 44 configured to be detachable from the outside of the housing 30.

[0051] By utilizing this, when a dielectric strength test is performed, the fastening bolts 44 can be removed, and after the dielectric strength test is completed, the fastening bolts 44 can be tightened to connect the ground side electrodes of the Y capacitors 14B and 14C to the ground potential.

[0052] FIG. 7 is a flowchart showing a method for a dielectric strength voltage test according to this embodiment.

[0053] In step S10, an operator attaches the test device 100 to the power supply circuit 11. More specifically, the positive electrode 13P and the negative electrode 13N of the power supply line 13 of the power supply circuit 11 are short-circuited, and the positive electrode probe of the test device 100 is connected to this. At the same time, the negative electrode probe of the test device 100 is connected to the housing 30 of the power supply circuit 11.

[0054] At this time, the connection terminal 40 is insulated from the ground potential as shown in FIG. 6A.

[0055] In step S20, a test procedure for performing a dielectric strength test is executed by the test device 100. The test device 100 applies an AC current (50 Hz, 2000 V) for 60 seconds. During this time, the test device 100 measures the electrical characteristics between the power line 13 and the housing 30, and evaluates the dielectric strength test based on the measurement results (step S30).

[0056] After the dielectric strength test is completed, in step S40, the probe of the test device 100 is removed from the power supply circuit 11, and the short circuit between the positive electrode 13P and the negative electrode 13N of the power supply line 13 is restored.

[0057] Next, in step S50, as shown in Fig. 6B, insulator 200 is removed from the gap between connection terminal 40 and bottom 33. Insulator 200 is removed from the gap between connection terminal 40 and bottom 33 by holding the portion of insulator 200 that extends outside housing 30 and pulling it out.

[0058] Next, in step S60, as shown in Fig. 6C, a connection procedure is performed in which fastening bolts 44 are fastened to connection terminals 40 through holes 33A in bottom 33. As a result, the gap between connection terminal 40 and bottom 33 is connected by fastening bolts 44, and connection terminal 40 is electrically connected to ground potential. In this state, the ground-side electrodes of Y capacitors 14B, 14C are at ground potential, and they function as filter circuit 14 of power supply unit 10. Because connection terminal 40 is located on the outer edge of housing 30, the operation of fastening bolts 44 allows for greater freedom of tool handling and shorter operation time than when the connection terminal is located near the center of housing 30.

[0059] The embodiment of the present invention configured as described above is applied to a power supply device 1 that supplies power to a load 20 (inverter circuit 21 and motor 2). The power supply device 1 includes a power supply unit 10 that outputs power to a power supply line 13 consisting of a positive electrode 13P and a negative electrode 13N, and a housing 30 that houses the power supply unit 10 and is at ground potential. The power supply unit 10 includes a pair of Y capacitors 14B, 14C that are interposed between the positive electrode 13P and the negative electrode 13N and the housing 30. The power supply unit 10 also includes a connection terminal 40 that is connected to the Y capacitors 14B, 14C and that is disposed with a non-conductive gap relative to the housing 30, and a conductive means (fastening bolt 44) that is detachable from the outside of the housing 30 and that fills the gap when attached to the housing 30 to electrically connect the housing 30 and the connection terminal 40.

[0060] By such control, connection terminal 40, which is disposed between Y capacitors 14B, 14C and housing 30, can be switched between a state insulated from ground potential by having a gap therebetween and a state in which it is connected to ground potential by fastening bolt 44 being fixed. With such a configuration, for example, connection terminal 40 can be insulated from ground potential when conducting a dielectric strength voltage test, and Y capacitors 14B, 14C can be connected to ground potential after the test. This eliminates the need to significantly increase the number of parts for testing or to increase the resistance of Y capacitors 14B, 14C, thereby suppressing increases in costs.

[0061] Furthermore, in this embodiment, the gap is formed as a gap capable of holding the insulator 200, and the conductive means is attached when the insulator 200 is removed to the outside of the housing 30, so that when the conductive means is not attached, the degree of insulation between the connection terminal 40 and the housing 30 is increased.

[0062] Furthermore, in this embodiment, the conductive means is a fastening bolt 44 that is fastened to the connection terminal 40 from outside the housing 30 through a hole 33A formed in the housing 30, so that the connection terminal 40 can be made conductive to the ground potential by the simple operation of fastening the fastening bolt 44.

[0063] Furthermore, in this embodiment, the connection terminals 40 are disposed on the outer edge of the housing 30, which facilitates the work of fastening the fastening bolts 44 to the connection terminals 40, thereby reducing the work time.

[0064] In this embodiment, the housing 30 is made up of a box-shaped main body 32 with an open bottom and a bottom 33 that covers the open portion of the main body 32, and the conductive means is fastened to the connection terminal 40 from the outside of the bottom 33 through a hole 33A formed in the bottom 33. With this configuration, the connection terminal 40 can be electrically connected to the ground potential by the simple operation of fastening the fastening bolt 44 through the hole 33A in the bottom 33.

[0065] Furthermore, in this embodiment, the insulator 200 extends from the gap formed between the main body 32 and the bottom 33 to the outside of the housing 30, and is configured so that the insulator 200 can be removed to the outside of the housing 30 by pulling out the extended portion. This allows the insulator 200, which is sandwiched between the connection terminal 40 and the housing 30, to be removed to the outside of the housing 30 without disassembling the power supply device 1.

[0066] Furthermore, this embodiment includes a test procedure in which an AC current is applied between the positive electrode 13P and the negative electrode 13N of the power supply unit 10 and the housing 30 while the connection terminal 40 is insulated from the housing 30 to perform a dielectric strength test, and a connection procedure in which, after the test procedure, a conductive means is attached from the outside of the housing 30 to electrically connect the connection terminal 40 to the housing 30. This prevents a test current from flowing through the Y capacitors 14B and 14C during the dielectric strength test, allowing them to function as Y capacitors after the test. Therefore, the dielectric strength test can be performed without increasing costs.

[0067] Furthermore, in this embodiment, prior to the test procedure, the insulator 200 is sandwiched in the gap between the connection terminal 40 and the housing 30, and after the test procedure, prior to the connection procedure, the insulator 200 is removed from the gap between the connection terminal 40 and the housing 30. This makes it possible to increase the degree of insulation between the connection terminal 40 and the housing 30 during the dielectric strength voltage test.

[0068] The above describes embodiments of the present invention and their modifications. However, the above embodiments and modifications merely illustrate some of the application examples of the present invention, and are not intended to limit the technical scope of the present invention to the specific configurations of the above embodiments.

[0069] In the above-described embodiment, the insulator 200 is configured to extend outside the housing 30 from the gap between the notch 36A of the bottom 33 and the cooling water outlet 36, but this is not limited to this. In a configuration in which no gap is generated anywhere when the bottom 33 and the main body 32 are fixed by the fixing portion, as in the modified example shown in Fig. 8, only one fixing hole 31 adjacent to the connection terminal 40 may be configured so that no fixing member is fastened in advance. With this configuration, the insulator 200 can be configured to extend outside the housing 30 from the gap generated near this fixing hole 31.

[0070] In such a configuration, after the test is completed, the insulator 200 is removed to the outside of the housing 30, and then the fastening bolt 44 is fixed to the connection terminal 40 and a fixing member is fastened to the fixing hole 31 to close the gap at this location.

[0071] In the above-described embodiment, the connection terminal 40 is configured to be disposed between the cooling water inlet 35 and the cooling water outlet 36 inside the housing 30, but this is not limitative. The connection terminal 40 may be disposed anywhere as long as it can be disposed on the outer edge of the housing 30. [Explanation of symbols]

[0072] 1: power supply device, 10: power supply unit, 11: power supply circuit, 13: power line, 13N: negative pole, 13P: positive pole, 14: filter circuit, 14A: X capacitor, 14B: Y capacitor, 14C: Y capacitor, 20: load, 21: inverter circuit, 30: housing, 32: main body, 33: bottom, 33A: hole, 35: cooling water inlet, 35A: notch, 36: cooling water outlet, 36A: notch, 38: cooling water flow path, 40: connection terminal, 44: fastening bolt (conductive means), 200: insulator

Claims

1. A power supply device for supplying power to a load, comprising: a power supply unit that outputs power to a power supply line having a positive electrode and a negative electrode; a housing that houses the power supply unit and is at ground potential; Equipped with The power supply unit a pair of Y capacitors interposed between the positive and negative electrodes and the housing; a connection terminal connected to the Y capacitor and disposed with a non-conductive gap relative to the housing; a conductive means that is detachable from the outside of the housing and that connects the gap when attached to the housing to electrically connect the housing and the connection terminal; Equipped with The gap is formed as a gap capable of holding an insulator therebetween, The conductive means is attached with the insulator removed to the outside of the housing. power supply.

2. A power supply device according to claim 1, the conducting means is a bolt that is fastened to the connection terminal from the outside of the housing through a hole formed in the housing. power supply.

3. A power supply device according to claim 1 or 2, The conducting means is disposed on the outer edge portion of the housing. power supply.

4. A power supply device according to any one of claims 1 to 3, The housing includes a box-shaped main body portion having an open bottom side and a bottom portion that closes the open portion of the main body portion, the conductive means is fastened to the connection terminal from the outside of the bottom portion through a hole formed in the bottom portion; power supply.

5. A power supply device according to claim 4, The insulator sandwiched in the gap extends from the gap formed between the main body and the bottom to the outside of the housing, and is configured to be removable to the outside of the housing by pulling out the extended portion of the insulator from outside the housing. power supply.

6. A method for testing a power supply device that supplies power to a load, comprising: The power supply device a power supply unit that outputs power to a power supply line having a positive electrode and a negative electrode; a housing that houses the power supply unit and is at ground potential; Equipped with The power supply unit a pair of Y capacitors interposed between the positive and negative electrodes and the housing; a connection terminal connected to the Y capacitor and disposed with a non-conductive gap relative to the housing; a conductive means that is detachable from the outside of the housing and that connects the gap when attached to the housing to electrically connect the housing and the connection terminal; Equipped with a test procedure for conducting a dielectric strength test by applying an AC current between the positive and negative electrodes of the power supply unit and the case while the connection terminals and the case are insulated from each other; a connecting step of attaching the conducting means from the outside of the housing after the testing step to electrically connect the connection terminal and the housing; having Test methods for power supplies.

7. A method for testing the power supply device according to claim 6, comprising: Prior to the test procedure, an insulator is sandwiched between the connection terminal and the housing; After the test procedure, the insulator is removed from the gap between the connection terminal and the housing before the connection procedure. Test methods for power supplies.

Images