JP2018191400A - Power supply apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate repair when a failure is caused by abnormal overvoltage at an AC power supply.SOLUTION: A power supply apparatus 1 comprises a power supply apparatus main body 30 which supplies power from an AC power supply to an electric apparatus, and a protection device 20 which is separated from the power supply apparatus main body 30 and which is attachable to and detachable from the power supply apparatus main body 30. The protection device 20 comprises a power supply input unit 21 which receives power from the AC power supply, a power supply output unit 26 which is attachable to and detachable from the power supply apparatus main body 30 and which supplies the power received at power supply input means to the power supply apparatus main body 30, and a fuse 22 which, when voltage equal to or higher than predetermined voltage is supplied from the AC power supply, blocks the current flow between the power supply input unit 21 and the power supply output unit 26.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power supply device.

  The electric device operates with electric power supplied from an AC power source (commercial AC power source). In emerging countries, the AC power supply is not stable, so that a phenomenon such as a power failure or unstable power supply occurs. If the AC power supply is unstable, the electric device cannot operate stably. In particular, the AC power supply may be in an abnormal overvoltage state that exceeds a predetermined voltage. An abnormal overvoltage of the AC power supply causes a failure of the power supply device in the electrical equipment. A failed power supply must be repaired or replaced.

  The power supply device generates a DC voltage from an AC voltage by a smoothing circuit including a smoothing capacitor that is an electrolytic capacitor. The smoothing capacitor breaks and opens when the AC power supply becomes an abnormal overvoltage. When the smoothing capacitor is opened, electrolyte leakage occurs. Other components inside the electrical equipment may be damaged by the leaked electrolyte. In that case, it is necessary not only to repair or replace the power supply device but also to repair the electric device itself.

  Patent Document 1 discloses a power supply apparatus that blows a fuse and stops power supply before an AC power supply becomes overvoltage and liquid leakage of a smoothing capacitor occurs. FIG. 8 is a circuit diagram of such a power supply device. The power supply device 5 includes a protection circuit 40 in the power supply device main body 70 for protecting the power supply device main body 70 from an overvoltage of the AC power supply. When the AC power supply becomes an abnormal overvoltage, the DC voltage smoothed by the diode bridge 34 and the smoothing capacitor 35 rises and is applied to both ends of the smoothing capacitor 35. As a result, the potential across the smoothing capacitor 35 rises. When the potential at both ends of the smoothing capacitor 35 exceeds the breakdown voltage of the varistor 41 constituting the protection circuit 40, the varistor 41 becomes conductive. When the varistor 41 becomes conductive, charging of the electrolytic capacitor 44 is started. As the charged voltage rises, a switching FET (Field Effect Transistor) 36 is forcibly turned on. When the switching FET 36 is turned on, the fuse 32 is blown. As a result, the power supply path from the AC power supply is cut off, and the power supply to the power supply main body 70 is stopped.

JP 2006-288155 A

As described above, the power supply device including the protection circuit can prevent the smoothing capacitor from being opened due to an abnormal overvoltage of the AC power supply. However, the power supply device is damaged by the operation of the fuse. The power supply device needs to be repaired (replaced) for restarting. In addition, an abnormal overvoltage of the AC power supply may cause a short circuit failure in the varistors constituting the protection circuit. When the varistor is short-circuited, the power supply cannot be restored even if only the fuse is repaired (replaced), and the power supply itself needs to be replaced.
Especially in emerging markets, such power supply failures frequently occur. This increases the cost of replacing the power supply. In addition, due to a failure or replacement of the power supply device, downtime is generated in which the electrical equipment that houses the power supply device cannot be used.

  In view of the above problems, it is a main object of the present invention to provide a power supply device that can be easily restored and can reduce replacement costs when a failure occurs.

  The power supply device of the present invention includes a power supply device main body that supplies the supplied power to a predetermined electric device, and a protection device that is separate from the power supply device main body and can be attached to and detached from the power supply device main body. A power input unit that receives power from a power source, a power output unit that can be inserted into and removed from the power source body, and that supplies the power received by the power source unit to the power source body, and a predetermined amount from the power source. And a shut-off means for shutting off the energization between the power input means and the power output means when a voltage higher than the voltage is supplied.

  According to the present invention, the protection device provided separately from the power supply device main body cuts off the power supply when a voltage higher than a predetermined voltage is supplied from the power supply, so that the power supply device can be easily and inexpensively only by replacing the protection device. Can be recovered.

The block diagram of a power supply device. Explanatory drawing of the state which used the power supply device for the electric equipment. The block diagram of the power supply device which excluded the protective device. Explanatory drawing of the state which used the power supply device for the electric equipment. The block diagram of the power supply device which made the output cable unnecessary. Explanatory drawing of the state which used the power supply device for the electric equipment. The block diagram of the power supply device which provided the protection circuit also in the power supply device main body side. The block diagram of a power supply device.

  The power supply device of the present invention will be described with reference to the drawings.

(Configuration of power supply)
FIG. 1 is a configuration diagram of a power supply device. The power supply device 1 includes a power supply device main body 30 and a protection device 20 that is separate from the power supply device main body 30. The protection device 20 supplies power supplied from an AC power source, which is a commercial power source, via the input cable 10 to the power source device body 30 via the output cable 25. The power supply main body 30 supplies power corresponding to the supplied power to a predetermined electrical device.

  The protection device 20 includes a power input unit 21 that is an input connector, a fuse 22 for cutting off current, a varistor 23 that is a voltage breakdown element, and an output cable 25. The output cable 25 includes a power output unit 26 as an output connector at the tip. The power input unit 21 receives power supplied from an AC power source. When the power input from the AC power supply is normal, the protection device 20 supplies the power received by the power supply input unit 21 to the power supply device body 30 through the output cable 25 as it is. When the AC power supply is in an abnormal overvoltage state equal to or higher than a predetermined voltage, the protection device 20 functions as an overvoltage protection circuit that protects the power supply device body 30.

  The power supply main body 30 is a flyback switching power supply. The power supply device main body 30 includes a power input unit 31 that is an input connector, a fuse 32, a varistor 33, a diode bridge 34, a smoothing capacitor 35, a switching FET 36, a switching transformer 37, and a rectifier circuit 38. The power supply main body 30 generates a secondary output voltage, for example, a DC voltage of +24 [V], using the power supplied from the power input unit 31.

  By connecting the power supply output unit 26 of the output cable 25 of the protection device 20 and the power supply input unit 31 of the power supply device main body 30, the protection device 20 and the power supply device main body 30 are connected. The input cable 10 includes a power input unit 11 that is an input connector and a power output unit 12 that is an output connector. The power supply input unit 11 is connected to the AC power supply, and the power supply output unit 12 is connected to the power supply input unit 21 of the protection device 20, whereby the protection device 20 and the AC power supply are connected. The protection device 20 is configured to be detachably attached to the input cable 10 and the power supply device main body 30 by the power supply input unit 21 and the power supply output unit 26.

  FIG. 2 is an explanatory diagram of a state in which the power supply device 1 is used for an electrical device. The electric device 50 incorporates a power supply device main body 30. A power input unit 31 of the power supply main body 30 is disposed in an opening provided in a part of the casing of the electric device 50. The power output unit 26 of the output cable 25 of the protection device 20 can be inserted into and removed from the power input unit 31. By inserting the power output unit 26 into the power input unit 31, the protection device 20 and the power device main body 30 are electrically connected.

  An opening is provided in a part of the housing of the protection device 20. A power input unit 21 is disposed in this opening. The power output unit 12 of the input cable 10 can be inserted into and removed from the power input unit 21. By inserting the power output unit 12 into the power input unit 21, the protection device 20 and the input cable 10 are electrically connected. The power output unit 12 of the input cable 10 and the power output unit 26 of the protection device 20 have the same shape and structure. The power input unit 21 of the protection device 20 and the power input unit 31 of the power device main body 30 have the same shape and structure.

(Operation of power supply 1)
By connecting the power output unit 12 of the input cable 10 to an AC power supply and connecting the input cable 10, the protection device 20, and the power supply main body 30, power (AC voltage) is supplied to the power supply main body 30. The power supply main body 30 converts the supplied AC voltage into a DC voltage by the diode bridge 34 and the smoothing capacitor 35. When the switching FET 36 is controlled to be opened and closed by a power supply controller (not shown), an output voltage is output from the rectifier circuit 38 via the switching transformer 37. By feeding back the output voltage to the power supply controller, the output voltage of the power supply device main body 30 is controlled to be constant.

  The smoothing capacitor 35 is an electrolytic capacitor and has a withstand voltage of, for example, 400 [V]. The electrolytic capacitor is in a so-called valve open state in which the internal pressure increases and the valve opens when a voltage equal to or higher than the rated voltage is continuously applied. When the electrolytic capacitor is in a valve open state, the internal electrolytic solution is ejected. Therefore, generally, the valve opening voltage at which the valve of the electrolytic capacitor operates has a margin with respect to the rated voltage of the electrolytic capacitor. In the present embodiment, the valve opening voltage of the smoothing capacitor 35 is, for example, 520 [V].

  The protection device 20 includes a varistor 23, and the power supply main body 30 includes a varistor 33. The breakdown voltage of the varistor 23 of the protection device 20 is set lower than the breakdown voltage of the varistor 33 of the power supply device body 30. For example, the breakdown voltage of the varistor 23 is 470 [V], and the breakdown voltage of the varistor 33 is 510 [V].

  The varistor 23 becomes conductive when a surge voltage exceeding the breakdown voltage is applied, and clamps the surge voltage with the breakdown voltage. Therefore, when the AC voltage input to the power supply input unit 21 of the protection device 20 becomes an abnormal overvoltage exceeding the breakdown voltage of the varistor 23, the varistor 23 becomes conductive. When an abnormal overvoltage of the AC power source continues for a predetermined time, the varistor 23 is damaged due to a short mode failure. As a result, the hot pole and the neutral pole of the AC power supply are short-circuited, and the fuse 22 is melted. By blowing the fuse 22, the power supply path from the AC power source to the power supply main body 30 is interrupted. The same applies to the varistor 33. When a voltage exceeding the breakdown voltage is supplied to the power input unit 31, the varistor 33 becomes conductive, and a short mode failure occurs when this state continues for a predetermined time.

  In the present embodiment, as described above, the breakdown voltage of the varistor 23 is set to a value lower than the breakdown voltage of the varistor 33. Therefore, when the AC power supply becomes an abnormal overvoltage, the varistor 23 fails in the short mode before the short mode failure of the varistor 33 occurs. In addition, the fuse 22 is melted and the power supply to the power supply main body 30 is cut off. Thereby, component failure of the varistor 33 can be avoided. Further, since the smoothing capacitor 35 does not open, a failure of the smoothing capacitor 35 to open can be prevented.

  In the power supply device 1 configured as described above, when the AC power supply becomes an abnormal overvoltage of a predetermined voltage or higher, only the protection device 20 fails and the power supply device main body 30 does not fail. The protection device 20 and the power supply main body 30 are separate bodies, and the protection device 20 can be easily attached to and detached from the power supply main body 30. Therefore, the power supply device 1 is easily restored by replacing the protection device 20. Since the protection device 20 has a simple configuration and can be manufactured at a lower cost than the power supply device main body 30, the repair cost can be greatly reduced as compared with the case where the entire power supply device 1 is replaced as in the prior art. Such a power supply device 1 is suitable for use in an electric device 50 used in an area where commercial power is not stably supplied.

(Example in which the protective device 20 is not used)
In an area where commercial power is stably supplied, the power supply device 1 does not require the protection device 20. In this case, the power supply device 1 has a configuration in which the protection device 20 is omitted. FIG. 3 is a configuration diagram of the power supply device 2 without the protection device 20, and FIG. 4 is an explanatory diagram of a state in which the power supply device 2 is used in the electric device 50.

  As shown in FIG. 3, the power output unit 12 of the input cable 10 is connected to the power input unit 31 of the power supply main body 30. That is, as shown in FIG. 4, when the power output unit 12 of the input cable 10 is inserted into the power input unit 31, the input cable 10 and the power supply main body 30 are electrically connected. In the power supply device 2, there is no overvoltage protection function of the power supply main body 30 by the protection device 20. However, the varistor 33 and the fuse 32 provided in the power supply device body 30 provide overvoltage protection for the power supply device body 30.

  Which of the power supply devices 1 and 2 is used, that is, whether the protection device 20 is used / not used is determined depending on, for example, the country or region where the electrical device 50 is shipped. When the protection device 20 is used, the power output unit 26 of the protection device 20 is connected to the power input unit 31 provided on the outer surface of the electric device 50. When the protection device 20 is not used, the power output unit 12 of the input cable 10 is directly connected to the power input unit 31.

  As described above, since the power supply input unit 21 of the protection device 20 and the power supply input unit 31 of the power supply device main body 30 have the same connector structure, the configuration of the power supply device 2 that directly connects the input cable 10 to the power supply device main body 30 is provided. Selectable. Therefore, the same power supply device body 30 can be used for a country or region where the protection device 20 is required and for a country or region where the protection device 20 is not required. As a result, the design and manufacture of the power supply devices 1 and 2 can be shared, and the cost of the power supply device can be prevented from increasing.

(Modification 1 of a power supply device)
FIG. 5 is a configuration diagram of a power supply apparatus that does not require the output cable 25. The power supply device 3 is configured by connecting the protection device 60 and the power supply device main body 30 directly to each other. FIG. 6 is an explanatory diagram of a state in which the power supply device 3 is used for an electrical device. The protection device 60 is configured to be incorporated in the electric device 51.

  The configuration of the power supply device main body 30 is the same as that used for the power supply devices 1 and 2 and thus will not be described. The protection device 60 does not include the output cable 25. The protection device 60 has a configuration in which a light emitting diode 28 and a current limiting resistor 29 are added to the protection device 20 of the power supply device 1. The power output unit 24 that is an output connector of the protection device 60 is directly inserted into the power input unit 31 that is an input connector of the power device main body 30. As a result, the protection device 60 is connected to the power supply device main body 30. The power output unit 24 is inserted into the power input unit 31 when the protection device 60 is incorporated into the electric device 51.

  The protection device 60 includes a light emitting diode 28 and a current limiting resistor 29 connected in series on the output side of the fuse 22 and in parallel with the varistor 23. When the protection device 60 is connected to an AC power source and the fuse 22 is not blown, the light emitting diode 28 emits light. When the fuse 22 is blown, the light emitting diode 28 does not emit light. Therefore, the user can determine whether or not the fuse 22 is blown (that is, whether or not the fuse is broken) based on whether or not the light emitting diode 28 emits light in a state where the protective device 60 is connected to the AC power source.

  A fixing unit 63 is provided in the housing of the protection device 60. The housing of the electric device 51 containing the power supply main body 30 is provided with a storage portion 48 for incorporating the housing of the protection device 60 and a fixing portion 49. In such a configuration, after the protection device 60 is inserted into the storage portion 48 of the electric device 51, the fixing portion 63 is fixed to the fixing portion 49 of the electric device 51 with the screws 62. The protective device 60 is frame grounded, and the ground potential is shared with the casing of the electric device 51 through the two screws 62.

  The power output unit 24 of the protection device 60 is configured to be fitted with the power input unit 31 of the power device main body 30 by slide-in. By inserting the protective device 60 into the storage portion 48 of the electrical device 51, the connectors are fitted together, and the electrical connection between them is completed. Wiring to the electrical device 51 is completed by inserting the input cable 10 into the power supply input unit 21 of the protection device 60 incorporated in the electrical device 51.

  The power supply device 3 is repaired according to the following procedure when the AC power supply becomes an abnormal overvoltage and the protection device 60 fails. First, the screw 62 is removed, and the protection device 60 is pulled out from the storage portion 48 of the electric device 51. Next, the protection device 60 for replacement is inserted into the storage portion 48 and fixed with the screws 62. The repair is completed by replacing the failed protection device 60 in this way.

  The power supply device 3 configured as described above has the same effects as the power supply device 1. Further, the power supply device 3 has a configuration in which the protection device 60 is incorporated in the electric device 51. Therefore, the power supply device 3 does not require the output cable 25 for connecting the protection device 20 such as the power supply device 1 and the power supply device main body 30, and accordingly, the cost is reduced and the wiring is simplified. Moreover, the installation space for the protection device 60 is not required around the electric device 51 during use.

(Modification 2 of the power supply device)
FIG. 7 is a configuration diagram of a power supply apparatus in which a protection circuit is also provided on the power supply apparatus main body side. The power supply device 4 includes a protection circuit 40 in the power supply device main body 70. Further, the protection device 61 does not include the varistor 23. Since the other configuration of the power supply device 4 is the same as that of the power supply device 1, the description thereof is omitted.

  The protection circuit 40 of the power supply main body 70 includes a varistor 41, resistors 42 and 43, an electrolytic capacitor 44, and a diode 45. The input of the protection circuit 40 is connected to both ends of the smoothing capacitor 35, and the output is connected to the gate of the switching FET 36 which is a semiconductor element.

  The AC voltage supplied to the power supply device main body 70 is rectified by the diode bridge 34 and the smoothing capacitor 35 and converted to a DC voltage (Vdc). The AC power supply becomes an abnormal overvoltage, and the converted DC voltage (Vdc) increases. The DC voltage (Vdc) is applied to both ends of the smoothing capacitor 35, and the potential across the smoothing capacitor 35 rises due to the rise of the DC voltage (Vdc). When the DC voltage (Vdc), which is the potential across the smoothing capacitor 35, exceeds the breakdown voltage (Vd) of the varistor 41, the varistor 41 becomes conductive and current begins to flow through the resistors 42 and 43. When the current starts to flow, the voltage (Vdc−Vd) is divided by the resistors 42 and 43, and charging of the electrolytic capacitor 44 is started by the divided voltage. As the voltage charged in the electrolytic capacitor 44 rises, the gate signal of the switching FET 36 is forced to go high via the diode 45. The switching FET 36 is an N-channel switching FET and is turned on when the gate signal is high. Therefore, the voltage charged in the electrolytic capacitor 44 rises, and the switching FET 36 is forcibly turned on.

  The power supply device main body 70 feeds back the output voltage of the power supply device main body 70 and controls the duty ratio of the drive signal of the switching FET 36 to thereby control the output voltage to be constant. The gate signal of the switching FET 36 is, for example, a rectangular wave of 60 [kHz] and a duty ratio of about 40%. When the overvoltage of the AC power supply is detected by the protection circuit 40, the gate signal of the switching FET 36 is fixed to high. As a result, the power supply main body 70 enters the overcurrent state because the switching FET 36 is forcibly turned on.

The rated current of the fuse 22 of the protection device 61 is set smaller than the rated current of the fuse 32 of the power supply device main body 70. For example, the fuse 22 has a rated current of 4.5 [A], and the fuse 32 has a rated current of 6.3 [A].
When the AC power supply becomes an abnormal overvoltage, the protection circuit 40 operates and the switching FET 36 is forcibly turned on. As a result, an overcurrent flows through both the fuse 22 and the fuse 32. Since the fuse 22 has a smaller rated current than the fuse 32, the fuse 22 is blown before the fuse 32 is blown. As a result, the power supply path to the power supply device main body 70 is interrupted, and the fuse 32 is not blown. As a result, the power supply main body 70 is not damaged even if the AC power supply is abnormal overvoltage, and only the protective device 61 fails.

The power supply main body 70 is configured such that when the switching FET 36 is forcibly turned on, the fuse 22 is blown before the switching FET 36 is damaged. That is, when the AC power supply becomes an abnormal overvoltage, the time until the switching FET 36 breaks down due to the overcurrent is set longer than the time until the fuse 22 is blown. For example, the element destruction time when the switching FET 36 is forcibly turned on is set to 0.7 seconds, and the cutoff time of the fuse 22 is set to 0.2 seconds.
In such a configuration, when the AC power supply becomes an abnormal overvoltage, the fuse 22 of the protection device 61 is cut off before the switching FET 36 is damaged. Thereby, the failure of the power supply device main body 70 due to the breakage of the switching FET 36 is avoided. Note that the time until the switching FET 36 breaks down can be increased by increasing the maximum current rating of the switching FET 36, or increasing the size of the heat sink fixed to the switching FET 36.

  The breakdown voltage of the varistor 41 of the protection circuit 40 is set lower than the valve opening voltage of the smoothing capacitor 35. For example, when the smoothing capacitor 35 has a withstand voltage of 400 [V] and the valve opening voltage is 520 [V], the breakdown voltage of the varistor 41 is set to a voltage lower than the valve opening voltage 520 [V], for example, 470 [V]. The In such a configuration, when the AC power supply becomes an abnormal overvoltage, the breakdown operation of the varistor 41 of the protection circuit 40 is started before the smoothing capacitor 35 is opened. Then, the switching FET 36 is forcibly turned on, and the fuse 22 is blown.

  The power supply device 4 configured as described above has the same effects as the power supply device 1. That is, when the AC power supply becomes an abnormal overvoltage, the power supply device 4 can prevent only the protective device 61 from being broken and prevent the power supply device main body 70 from being broken. Therefore, the repair is completed by exchanging only the protection device 61, and the power supply device 4 is easily restored. Similarly to the power supply device 3, the power supply device 4 may not be provided with the output cable 25, and the protection device 61 and the power supply device main body 70 may be directly connected by connectors.

(Example in which the protective device 61 is not used)
The power supply device 4 can be used as a configuration in which the protection device 61 is not used in the region where the commercial power supply is not stable, like the power supply device 1. In FIG. 8, the input cable 10 is directly connected to the power supply main body 70 in this case. When the protective device 61 is not used, the fuse 32 is blown in the power supply main body 70 when the AC power supply becomes an abnormal overvoltage and the switching FET 36 is forcibly turned on. As a result, the power supply path from the AC power supply is cut off, the power supply to the power supply main body 70 is stopped, and the smoothing capacitor 35 can be prevented from opening.

  In the power supply apparatuses 1 to 5 described above, the configurations of the power supply main bodies 30 and 70 are the same regardless of the stability of the commercial power supply. The configuration of the power supply main bodies 30 and 70 may be different depending on the stability of the commercial power source, that is, for emerging countries and for countries other than emerging countries.

  In the case of the power supply devices 1 and 3, the protection devices 20 and 60 and the power supply device main body 30 are respectively provided with fuses to be redundant. Further, the protection devices 20 and 60 and the power supply device main body 30 are provided with varistors to be redundant. Therefore, the power supply devices 1 and 3 using the protection devices 20 and 60 may have a configuration in which the fuse 32 and the varistor 33 of the power supply device body 30 are removed. Similarly, the power supply device 4 may have a configuration in which the fuse 32 and the varistor 33 of the power supply device main body 70 are removed.

  In the power supply devices 1 to 5, a varistor is used as the voltage breakdown element, but a Zener diode can also be used. Further, although a fuse is used for overcurrent interruption, a fuse resistor (fuse resistor), a current breaker, or the like may be used.

Claims (10)

A power supply device main body for supplying the supplied power to a predetermined electrical device, and a protection device that is separate from the power supply device main body and detachable from the power supply device main body,
The protective device is
Power input means for receiving power from the power source;
A power output means that can be inserted into and removed from the power supply body, and that supplies the power received by the power input means to the power supply body;
When the voltage higher than a predetermined voltage is supplied from the power supply, the power supply input means and the power supply output means is provided with a cutoff means for cutting off the energization,
Power supply. The protection device further includes a voltage breakdown element that is turned on when a voltage equal to or higher than the predetermined voltage is supplied from the power source, and the blocking means is connected to the power supply input means when the voltage breakdown element is turned on. The power supply with the power output means is cut off,
The power supply device according to claim 1. The power supply device body includes a smoothing capacitor that smoothes the power supplied from the protection device,
The voltage breakdown element of the protection device is characterized in that the breakdown voltage is set lower than the valve opening voltage of the smoothing capacitor,
The power supply device according to claim 2. The power supply body is
A second blocking means capable of blocking the power supply path from the protection device;
A second voltage breakdown element that conducts when a voltage equal to or higher than the predetermined voltage is supplied from the power source via the protection device, and causes the second cutoff means to shut off the power supply path. ,
The second voltage breakdown element is characterized in that a breakdown voltage is lower than a breakdown voltage of the voltage breakdown element of the protection device.
The power supply device according to claim 2 or 3. The protective device and the power supply body are electrically connected via a cable,
The power supply device of any one of Claims 1-4. The power supply main body is built in the electric device,
The electrical device includes a storage unit into which the protection device is inserted.
The power supply device of any one of Claims 1-4. The storage unit is provided with a connector of the power supply body to which the power output means is inserted and removed,
In the protection device, the power output means is inserted into the connector in a state of being stored in the storage portion.
The power supply device according to claim 6. The structure of the power supply input means of the protection device is the same as the structure of the connector into which the power supply output means of the power supply device body is inserted and removed.
The power supply device according to claim 1. The blocking means is any one of a fuse, a fuse resistor, and a current breaker,
The power supply device according to claim 1. The power supply body includes a second shut-off means for shutting off the energization in the power supply body when a voltage equal to or higher than a predetermined voltage is supplied from the power supply.
The power supply device according to claim 1.

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