JP2015039463A - Vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely stop an electric blower even at the time of abnormality of a circuit element, relating to an AC/DC vacuum cleaner in which a power supply route to the electric blower is switched depending on DC or AC.SOLUTION: A power source supply route from a secondary battery 6 to an electric blower 2 and a part of a power source supply route from a power source cord 13 to the electric blower 2, are shared. And further, as opening/closing means for reach route, a semiconductor switching element and an electromagnetic relay are provided in series. When switching on/off of the opening/closing means, control is made so that turning on/off of the semiconductor switching element is performed before switching between on and off of the electromagnetic relay. In a case where a current is not entirely zero when the electromagnetic relay on the power source supply route is on and the semiconductor switching element on the same route is off, it is determined that the semiconductor switching element is abnormal. The power source relay on the route is turned off, and on and after, regardless of connected/not connected of a commercial power source 1 and regardless of instruction/no instruction from operation means 9, none of opening/closing means is turned on.

Description

  The present invention relates to an AC / DC vacuum cleaner that can be operated with either a commercial power source or a secondary battery in a general household.

  Many AC / DC vacuum cleaners that can be used with either an AC commercial power supply or a DC power supply such as a secondary battery have been considered for the power supply of the electric blower built in the vacuum cleaner. One of the issues is related to switching between AC power supply and DC power supply. Broadly speaking, the power supply itself can be converted into AC and DC by using an inverter circuit, etc. A power supply path shared between alternating current and direct current (for example, see Patent Document 1), and a power supply path to the electric blower that is switched between alternating current and direct current without converting power (for example, see Patent Document 2) There is.

JP 2003-93298 A JP 2001-321307 A

  Not only in vacuum cleaners, but in AC / DC dual-purpose equipment, since the motor to be driven is shared between AC power and DC power, part or all of the power supply path to the motor is shared between AC and DC It will be. Further, apart from the power supply path to the electric motor or the power supply path to the power circuit, the path switching means is indispensable.

  Here, in the system represented by Patent Document 1, a power supply circuit such as an inverter circuit is required, and there is a problem that the control circuit becomes expensive and complicated.

  The method represented by Patent Document 2 can be realized with a relatively simple circuit configuration, but requires a device for switching the power supply path with certainty. For example, as proposed in Patent Document 2, in order to reliably turn off the AC switching element, after switching to DC, the DC switching element is turned on for a predetermined time.

  However, this is true only on the assumption that the AC switching element is normal. For example, when the AC switching element is short-circuited for some reason, the DC switching element is turned on. However, the AC switching element continues to be energized, and therefore there is no means to stop the electric blower until the secondary battery is empty. Even if the AC switching element is turned on even once due to external noise or the like, the electric blower may continue to move until the secondary battery becomes empty. It is done.

  Furthermore, when the switching element is short-circuited, depending on the circuit configuration, there is a possibility that this may lead to a short circuit between the commercial power supply (AC 100V) and the secondary battery, welding of electrical contacts of the path switching means, etc. In this case, it is presumed that various problems such as deterioration of the secondary battery and destruction of the circuit element occur.

  The present invention solves the above-mentioned conventional problems, and even when the switching element for driving the electric blower is short-circuited, the electric blower can be stopped reliably, and the secondary battery is deteriorated or the circuit element is destroyed. Therefore, the present invention provides a highly reliable vacuum cleaner that prevents secondary disasters.

  In order to solve the conventional problems, the present invention detects at least an electric blower in a cleaner body, a power cord connectable to a commercial power source, a secondary battery, and whether or not the power cord is connected to a commercial power source. Built-in connection detection means and current detection means for detecting the current flowing through the electric blower, and further provided with a grip portion that is gripped by a user during cleaning, and operated to operate the vacuum cleaner Operating means for sharing the power supply path from the secondary battery to the electric blower and a part of the power supply path from the power cord to the electric blower, and opening / closing means for each path individually The semiconductor switching element and the electromagnetic relay are respectively provided in series. When the operation is stopped, all of the opening / closing means are turned off. During operation, the opening / closing means on the commercial power supply path is turned on if a commercial power source is connected. In If not connected, the opening / closing means on the secondary battery path is turned on so that the electric blower is supplied with power from the commercial power source when connected to the commercial power source and from the secondary battery when not connected, When the switching means is switched on and off, the semiconductor switching element is controlled to be turned on and off before the electromagnetic relay is turned on and off, and the electromagnetic relay on the power supply path is turned on and on the same path. If the current when the semiconductor switching element is off is not substantially zero, it is determined that the semiconductor switching element is abnormal, and the power supply relay on the same path is turned off. Regardless of whether or not there is an instruction from the means, all the opening and closing means are not turned on.

  As a result, short-circuit breakdown of the electronic semiconductor switching element is detected by current detection in a state where the electromagnetic relay is on and the semiconductor switching element is off, and all the switching means are not turned on thereafter. The number of cases where the electric blower keeps moving unintentionally can be dramatically reduced.

  In addition, an electromagnetic relay, which is an electrical contact type switch, and a semiconductor switching element are placed in series on each power supply path, so even if the semiconductor switching element is unintentionally turned on due to external noise, the power supply path If a bidirectional thyristor is used for the semiconductor switching element on the AC power supply path, the current will continue to flow through the same path even if the electrical contacts of the electromagnetic relay are welded. There is no. In addition, even if the contact of the electromagnetic relay is unintentionally closed due to an impact when stepping over the floor, no current flows through the power supply path, so the contact of the electromagnetic relay contacts by current sparks. Does not occur.

  Accordingly, the probability of occurrence of a short circuit between the commercial power source (AC 100 V) and the secondary battery, welding of electrical contacts of the path switching means, and the like can be dramatically reduced.

  According to the present invention, even when a switching element for driving an electric blower is broken short-circuited, the electric blower can be stopped reliably, and secondary disasters such as secondary battery deterioration and circuit element destruction are prevented. A highly reliable vacuum cleaner can be provided.

The circuit block diagram of the vacuum cleaner in embodiment of this invention Overall perspective view of the vacuum cleaner Control flowchart of the vacuum cleaner Control flowchart of the vacuum cleaner Control flowchart of the vacuum cleaner

  The first invention includes at least an electric blower, a power cord connectable to a commercial power source, a secondary battery, a connection detection means for detecting whether the power cord is connected to a commercial power source, and the electric motor. A current detection means for detecting the current flowing through the blower, and a handle portion that is gripped by the user during cleaning, and an operation means for operating the vacuum cleaner provided on the handle portion. The power supply path from the secondary battery to the electric blower and a part of the power supply path from the power cord to the electric blower are shared, and a semiconductor switching element and an electromagnetic Each relay is provided in series, and when the operation is stopped, all of the open / close means are turned off. During operation, if the commercial power supply is connected, the open / close means on the commercial power supply path is turned on, and if not connected 2 By turning on the opening / closing means on the battery path, power is supplied to the electric blower from the commercial power supply when the commercial power supply is connected, and from the secondary battery when the commercial power supply is not connected. In this case, control is performed so that the semiconductor switching element is turned on and off before switching the electromagnetic relay on and off, and the electromagnetic relay on the power supply path is turned on and the semiconductor switching element on the same path is turned off. If the current is not substantially zero, it is determined that the semiconductor switching element is abnormal, the power supply relay on the same path is turned off, and thereafter, regardless of whether the commercial power supply is connected and whether there is an instruction from the operating means This is an AC / DC vacuum cleaner that prevents all the opening / closing means from being turned on.

  As a result, short-circuit breakdown of the semiconductor switching element is detected by current detection in a state where the electromagnetic relay is on and the semiconductor switching element is off, and thereafter all the switching means are not turned on. The case where the blower keeps moving unintentionally can be dramatically reduced.

  In addition, an electromagnetic relay, which is an electrical contact type switch, and a semiconductor switching element are placed in series on each power supply path, so even if the semiconductor switching element is unintentionally turned on due to external noise, the power supply path If a bidirectional thyristor is used for the semiconductor switching element on the AC power supply path, the current will continue to flow through the same path even if the electrical contacts of the electromagnetic relay are welded. There is no. In addition, even if the contact of the electromagnetic relay is unintentionally closed due to an impact when stepping over the floor, no current flows through the power supply path, so the contact of the electromagnetic relay contacts by current sparks. Does not occur.

  Accordingly, the probability of occurrence of a short circuit between the commercial power source (AC 100 V) and the secondary battery, welding of electrical contacts of the path switching means, and the like can be dramatically reduced.

  The second invention is characterized in that, in the first invention, the operation is stopped when the power cord is connected to the commercial power supply during operation with at least the secondary battery.

  As a result, it is known that the operation is stopped when the power supply path is switched between the DC power supply and the AC power supply. However, the present invention additionally adds a short circuit of the semiconductor switching element at the time of the stop as in the first invention. Since the breakage is detected and all the opening / closing means can be prevented from being turned on thereafter, the electric blower can be reliably stopped even when the power cord is connected to the commercial power supply without being instructed to stop the operation by the operating means, and the commercial power supply ( The probability of occurrence of a short circuit between the AC 100V) and the secondary battery, welding of electrical contacts of the path switching means, etc. can be dramatically reduced. Note that the operation stop condition is limited to when the power cord is connected during the operation of the secondary battery when the connection with the commercial power source is disconnected during the operation with the commercial power source as in the embodiment described later. This is because even if the semiconductor switching element on the commercial power supply path is short-circuited, a circuit configuration in which no current flows on the path can be considered.

  The third invention is characterized in that, in particular, in the first or second invention, during operation, the electromagnetic relay on the power supply path remains on, and the semiconductor switching element on the same path is periodically turned off for a short period of time. It is what. This makes it possible to detect a short circuit failure of the semiconductor switching element even during operation, so that even if the connection with the commercial power source is disconnected during operation with the commercial power source as described in the second invention, the semiconductor on the commercial power source path is surely Can detect short circuit failure of switching elements.

  According to a fourth aspect of the invention, in particular, in any one of the first to third aspects, the semiconductor switching element on the power supply path is turned on for a short period of time with all the electromagnetic relays turned off during operation stop. When it is not substantially zero, it is determined that the electromagnetic relay is abnormal, and thereafter, at least the opening / closing means on the other path is not turned on regardless of whether the commercial power supply is connected or not, and whether there is an instruction from the operating means. It is what. Thereby, since contact welding of an electromagnetic relay can be detected, a more reliable vacuum cleaner can be provided.

  According to a fifth aspect of the invention, in particular, in any one of the first to fourth aspects of the invention, a nonvolatile storage unit is provided, and abnormality information of electromagnetic relays and semiconductor switching elements on each path is stored in the storage unit. The opening / closing means is controlled in accordance with the abnormality information stored in the storage means. As a result, the abnormality information is stored in the non-volatile storage means, so even if the connection with the commercial power source is disconnected and the secondary battery is emptied, that is, the power supply to the control circuit is cut off. The abnormality information is not reset, and therefore, control equivalent to that of any one of the first to fourth inventions can be reliably performed when the power is turned on again.

  The sixth aspect of the invention relates to a display means for displaying an abnormality or a notification for notifying when an abnormality of the opening / closing means is detected or when there is abnormality information in the storage means in any one of the first to fifth inventions. At least one of the means is provided. Thereby, since the abnormality of the opening / closing means can be transmitted to the user, an appropriate response can be promoted.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
The vacuum cleaner in embodiment of this invention is demonstrated using FIGS. 1-4. FIG. 2 is an overall perspective view of the electric vacuum cleaner according to the present embodiment.

  In FIG. 2, the vacuum cleaner main body 21 is provided with an electric blower chamber 22 incorporating the electric blower 2 at the rear, and a secondary battery 6 and a power cord 13 are arranged on both sides thereof. A dust collection chamber 23 for collecting dust is disposed at the front of the cleaner body 21, and an intake port 26 to which a connection pipe 25 provided at one end of the hose 24 is detachably connected is provided at the front side thereof. Is provided.

  At the other end of the hose 24, there is a tip pipe 28 provided with a handle 27 having an operation lamp 9 which is an operation means 9 for operating the cleaner main body 21 and operating the cleaner body 21 and an abnormality information display means. Is provided. The operation means 9 is composed of an “OFF” button (not shown) and an “RUN” button (not shown).

  Reference numeral 29 denotes a telescopic extension pipe. The downstream end is detachably connected to the tip pipe 28, and the other end is detachably connected to a suction tool 30 having a suction port on the bottom surface. The power cord 13 is normally housed in the rear part of the cleaner body 21, but can be pulled out and connected to an outlet (commercial power source 1).

  Next, the configuration of the control circuit will be described with reference to FIG. Both the secondary battery 6 and the power cord 13 are connected to a power supply circuit 7 for supplying power to the signal control means 14, and the power supply circuit 7 is connected when the power cord 13 is connected to the commercial power supply 1. A power source is created from a commercial power source, and when not connected to the commercial power source 1, the power source is constructed from the secondary battery 6.

  The power cord 13 is further connected to a zero-crossing detection circuit 8 for detecting a zero-crossing point (timing when the voltage becomes zero) of the commercial power supply waveform, and the electromagnetic relay A3a and the semiconductor switching element A connected in series. The electric blower 2 is connected through an opening / closing means A3 composed of 3b (hereinafter referred to as a bidirectional thyristor).

  On the other hand, the secondary battery 6 is also connected to the electric blower 2 through an opening / closing means B4 including an electromagnetic relay B4a and a semiconductor switching element B (hereinafter referred to as MOSFET) 4b connected in series. Has been.

  A path from one side of the power cord 13 and the secondary battery 6 to the opening / closing means A3 and the opening / closing means B4 via the electric blower 2 is a power source shared by the commercial power source 1 and the secondary battery 6 A current detection means 5 for detecting a current flowing through the electric blower 2 is arranged on the supply path.

  The electromagnetic relay A3a, the bidirectional thyristor 3b, the electromagnetic relay B4a, and the MOSFET 4b are connected to the signal control means via the electromagnetic relay A drive circuit 11, the drive circuit A15, the electromagnetic relay B drive circuit 12, and the drive circuit B16, respectively. 14, the electric blower 2 is driven and controlled.

  Further, the zero cross detection circuit 8, the non-volatile storage means 19, the operation means 9 and the abnormal lamp 18 are also connected to the signal control means 14 and controlled.

  The operation of the vacuum cleaner is performed as follows.

  When the “operation” button of the operation means 9 is operated, the electric blower 2 starts rotating, the vacuum cleaner starts operation, and conversely, when the “off” button of the operation means 9 is operated during operation, the electric blower 2 stops. At this time, if the power cord 13 is connected to the commercial power source 1 (outlet), the power supply source to the control circuit board 32 and the electric blower 2 is the commercial power source 1, and the power cord 13 is connected to the commercial power source 1. If not, the power supply source to the control circuit board 32 and the electric blower 2 is the secondary battery 6. The electric blower 2 also stops when the power cord 13 is removed / inserted during operation.

  The drive control of the electric blower 2 is performed by phase control when the power supply source is the commercial power supply 1, and is performed by PWM control when the secondary battery 6 is used. The phase control and PWM control are general controls, and the details thereof are omitted. However, in brief, phase control is one of methods for controlling the amount of current supplied to a load using an AC power supply. Therefore, by turning off some of the AC half cycle using a thyristor and changing the off rate, the PWM control is a method of changing the energization amount to the load using a DC power supply. One of the control methods is a control for changing the energization amount by repeatedly turning on / off the energization at a constant cycle and changing the ratio of the off period.

  During operation, the current flowing through the electric blower 2 is input to the A / D terminal of the signal control means 14 via the current detection means 5 and is calculated in the signal control means 14. The phase control angle (energization amount) and the PWM duty (energization amount) of the electric blower 2 are determined based on the calculation result, but are not related to the present invention, and details thereof are omitted.

  About the vacuum cleaner comprised as mentioned above, the operation | movement and an effect | action are demonstrated below using the control flowchart shown in FIG.3 and FIG.4 and FIG.5.

  When the control circuit board 32 is not turned on, that is, when the secondary battery 6 is empty and the power cord 13 is not connected to the commercial power supply 1, the signal control is first performed when the power is turned on for the first time. The means 14 reads the data stored in the storage means 19. Thereafter, the contents from step 10 are always processed while the control circuit board 32 is powered on.

  First, as shown in FIG. 3, in step 10, it is determined whether there is abnormality information. If there is abnormality, it is determined in step 15 whether the vehicle is operating. If the vehicle is in operation, a stop instruction is issued (without determining operation means 9), and the process proceeds to step 12. If it is not in operation, the abnormal information is stored and the abnormal lamp 18 is lit to notify the user that there is an abnormality.

  If there is no abnormality in step 10, the process proceeds to step 11 and the operation means 9 is determined. In step 11, a stop instruction is issued when the “OFF” button 9 a is pressed during operation, and an operation start instruction is issued if the “RUN” button 9 b is pressed during stop.

  Next, in step 12, it is determined whether the power cord 13 is connected to the commercial power source 1. The zero cross detection circuit 8 determines whether or not the commercial power source 1 is connected. That is, it is determined that the commercial power source 1 is connected if the zero cross has occurred at a predetermined cycle, and is not connected to the commercial power source 1 if the zero cross has not occurred for a predetermined time. If it is connected to the commercial power source 1, the AC connection flag is set, and if not connected, the flag is cleared. This flag is used for judging the abnormality of the opening / closing means described later.

  Next, in step 13, it is determined whether or not the power cord 13 is connected to the commercial power source 1 during operation with the secondary battery 6. In step 14, conversely, the operation is performed with the commercial power source 1. It is determined whether or not the power cord 13 is disconnected from the commercial power source 1. That is, if the commercial power supply 1 is connected and operating in step 12 but the power supply path opening / closing means B4 of the secondary battery 6 is on, the secondary battery 6 is operated. It can be determined that the power cord 13 is connected to the commercial power source 1 during the operation, and conversely, the commercial power source 1 is not connected and is operating, but the commercial power source 1 is opened and closed for the power supply path. If the means A3 is turned on, it can be determined that the power cord 13 is disconnected from the commercial power source 1 while the commercial power source 1 is operating. Here, in either case, that is, when the power cord 13 is attached / detached during operation, a stop instruction is issued.

  As shown in FIG. 4, in the next step 20 and subsequent steps, the opening / closing means is controlled according to the operation start instruction and the stop instruction, and the abnormality of the opening / closing means is detected.

  In step 20, if there is a stop instruction, if there is an operation start instruction, and if neither instruction is present, the processing contents are branched accordingly.

  If there is a stop instruction, the process proceeds to step 21; if there is a driving instruction, the process proceeds to step 25; otherwise, the process proceeds to step 30 shown in FIG.

In step 21, that is, when there is a stop instruction, first, in step 21, the bidirectional thyristor 3b and the MOSFET 4b are turned off. One second later, in step 22, it is determined that the output of the current detection means 5 at that time is substantially zero, that is, normal if no current flows through the electric blower 2, and abnormal if it does flow, and the process proceeds to step 23.

  In step 23, an abnormality flag is set according to the presence or absence of the AC connection flag set in step 12. If the commercial power source 1 is connected, the bidirectional thyristor 3b which is a semiconductor switching element on the commercial power source 1 side is abnormal. If the commercial power source 1 is not connected, the MOSFET 4b which is a semiconductor switching element on the secondary battery 6 side. Is determined to be abnormal. Regardless of the presence or absence of abnormality, the stop control is completed by turning off the electromagnetic relay A3a and the electromagnetic relay B4a in step 24.

  In step 25, that is, when there is an operation start instruction, almost the reverse control to the aforementioned stop process is performed. First, the electromagnetic relay is turned on, and after 1 second, the current is measured to determine abnormality, and if normal, the semiconductor switching element is turned on and the operation start control is completed. If there is an error, set the error flag. At this time, the abnormality flag is set according to the presence or absence of the AC connection flag as in the stop process, and the electromagnetic relay and the semiconductor switching element are turned on when the commercial power source 1 is connected according to the presence or absence of the AC connection flag. The commercial power source 1 is turned on, and the secondary battery 6 is turned on when the commercial power source 1 is not connected.

  Finally, step 30 shown in FIG. 5, that is, processing when there is neither a stop instruction nor an operation start instruction, that is, complete stop or steady operation will be described. The process proceeds to step 33 during a complete stop, and to step 31 during steady operation.

  In step 31, that is, during steady operation, the output value of the current detection means 5 is captured in the phase control off period when the commercial power source 1 is connected and in the PWM control off period when the commercial power source 1 is not connected. If the value at that time is substantially zero, that is, if current does not flow through the electric blower 2, it is determined to be normal, and if it is flowing, it is determined to be abnormal, and the process proceeds to step 32. In step 32, the abnormality flag is set according to the presence or absence of the AC connection flag set in step 12. Since the setting method is the same as step 23 described above, the description is omitted.

  In step 33, that is, during complete stop, abnormality determination of the electromagnetic relay is performed at a cycle of 1 second. The measurement timer of the abnormality determination cycle is always counting up. When the timer reaches 0.9 seconds, in step 37, the semiconductor switching element is turned on. Also at this time, according to the AC connection flag, if the commercial power source 1 is connected, the bidirectional thyristor 3b which is an element on the commercial power source 1 side is turned on, and if not connected, the MOSFET 4b which is an element on the secondary battery 6 side. Turn on.

  0.1 seconds after that, that is, when the timer reaches 1 second, the output value of the current detection means 5 is taken in. The value at that time is substantially zero, that is, if the current does not flow through the electric blower 2, it is normal and flows. If so, the process proceeds to step 35.

  If the commercial power source 1 is connected, it is determined that the electromagnetic relay A3a on the commercial power source 1 side is abnormal, and if not connected, it is determined that the electromagnetic relay B4a on the secondary battery 6 side is abnormal. Thereafter, in step 36, the semiconductor switching element is turned off and the timer is reset regardless of whether there is an abnormality.

  When all the above processes are completed, the process returns to step 10 and the same process is performed.

As described above, according to the present embodiment, the electromagnetic relay is turned on at any time when the operation is started, during operation, during stoppage, when the power cord 13 is attached or detached, that is, when the power supply path is switched. Short-circuit breakdown of the semiconductor switching element is detected by current detection when the semiconductor switching element is off, and short-circuit breakdown of the electromagnetic relay is detected by current detection when the electromagnetic relay is off and the semiconductor switching element is on. If any short-circuit breakage is detected, since all the opening / closing means are not turned on thereafter, the number of cases where the electric blower 2 continues to move unintentionally as in the conventional case can be reduced.

  Further, since the abnormality information is stored in the nonvolatile storage means 19, even after the connection with the commercial power source 1 is disconnected and the secondary battery 6 is emptied, that is, the power supply to the control circuit board 32 Even if it is cut off, abnormal information is not reset, and a highly reliable vacuum cleaner can be provided.

  As described above, the vacuum cleaner according to the present invention is effective for both AC and DC vacuum cleaners, and not only for home use but also for business use and built-in type (central cleaner). It can be applied to various types of vacuum cleaners.

1 Commercial power supply 2 Electric blower 3 Opening / closing means A
3a Electromagnetic relay A
3b Semiconductor switching element A (bidirectional thyristor)
4 Opening / closing means B
4a Electromagnetic relay B
4b Semiconductor switching element B (MOSFET)
5 Current detection means 6 Secondary battery 7 Power supply circuit 8 Zero cross detection circuit (commercial power supply connection detection means)
9 Operation means 9a "Off" button 9b "Run" button 11 Electromagnetic relay A drive circuit 12 Electromagnetic relay B drive circuit 13 Power cord 14 Signal control means 15 Drive circuit A
16 Drive circuit B
18 Abnormal lamp (display)
DESCRIPTION OF SYMBOLS 19 Memory | storage means 21 Vacuum cleaner main body 22 Electric blower chamber 23 Dust collection chamber 24 Hose 25 Connection pipe 26 Intake port 27 Handle 28 Tip pipe 30 Suction tool 32 Control circuit board

Claims (6)

At least an electric blower, a power cord connectable to a commercial power source, a secondary battery, connection detection means for detecting whether or not the power cord is connected to the commercial power source, and a current flowing through the electric blower are detected in the vacuum cleaner body And a current gripping unit that is gripped by a user during cleaning, and an operating unit that is provided in the gripping unit for operating the vacuum cleaner. A power supply path from the power supply to the electric blower and a part of the power supply path from the power cord to the electric blower, and a semiconductor switching element and an electromagnetic relay are connected in series as individual opening / closing means. When the operation is stopped, all of the opening / closing means are turned off. During operation, the opening / closing means on the commercial power supply path is turned on if the commercial power supply is connected, and on the secondary battery path if not connected. By turning on the closing means, power is supplied to the electric blower from the commercial power supply when the commercial power supply is connected, and from the secondary battery when the commercial power supply is disconnected, and when the opening / closing means is switched on and off. The current when the electromagnetic switching on / off of the semiconductor switching element is controlled before the electromagnetic relay is switched on / off, and the electromagnetic relay on the power supply path is on and the semiconductor switching element on the same path is off If it is not substantially zero, it is determined that the semiconductor switching element is abnormal, the power relay on the same path is turned off, and all the open / close operations are performed regardless of whether or not commercial power is connected and whether or not there is an instruction from the operating means. AC / DC dual-use vacuum cleaner that prevents the device from turning on. 2. The electric vacuum cleaner according to claim 1, wherein the operation is stopped when the power cord is connected to a commercial power source during operation with at least the secondary battery. 3. The vacuum cleaner according to claim 1, wherein during operation, the electromagnetic relay on the power supply path remains on, and the semiconductor switching element on the path is periodically turned off for a short period of time. While the operation is stopped, with all the electromagnetic relays turned off, the semiconductor switching elements on the power supply path are turned on for a short period of time, and when the current at that time is not substantially zero, it is determined that the electromagnetic relay is abnormal. The vacuum cleaner according to any one of claims 1 to 3, wherein the opening / closing means on at least the other path is not turned on regardless of whether or not a commercial power supply is connected and whether or not there is an instruction from the operation means. Non-volatile storage means is provided, and abnormality information of electromagnetic relays and semiconductor switching elements on each path is stored in the storage means, and the opening / closing means is controlled according to the abnormality information stored in the storage means. The electric vacuum cleaner according to any one of claims 1 to 4, wherein the electric vacuum cleaner is characterized. 6. A display means for displaying an abnormality when an abnormality of the opening / closing means is detected or when there is abnormality information in the storage means, or at least one of a notifying means for notifying is provided. The vacuum cleaner of any one of.

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