Patent Publication Number: US-2016241169-A1

Title: Power control device

Description:
TECHNICAL FIELD 
     The present invention relates to a power control device. 
     BACKGROUND ART 
     Electrical devices are known that are, for example, provided inside a home, and are operated with supplied power (for example, see Patent Literature 1). 
     CITATION LIST 
     [Patent Literature]. 
     [PTL 1] Japanese Patent Application Laid-Open No. 2011-160608 
     SUMMARY OF INVENTION 
     Technical Problem 
     For example, in electrical devices, including the electrical device in Patent Literature  1 , power is supplied as standby power even when the electrical devices are not operating. It could therefore be difficult to reduce the amount of power consumption in a home provided with the electrical device to below the amount of power supplied as standby power. 
     Solution to Problem 
     Mainly in order to address the above issue, the present invention is a power control device including a first detection device that detects that a knob provided on a room interior side of a door has turned to a first turn position when the door is locked, and a cutoff device that cuts off power supply to an electrical device provided in the room interior when the first detection device has detected that the knob has turned to the first turn position. 
     Other features of the present invention are made clear by the appended drawings and description of the present specification. 
     Advantageous Effects of Invention 
     The present invention enables power supply to be cut off to an electrical device. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a diagram illustrating a residence in an embodiment of the present invention. 
         FIG. 2  is an exploded perspective view illustrating a door and a control device of an embodiment of the present invention. 
         FIG. 3  is a side view illustrating a door and a control device of an embodiment of the present invention. 
         FIG. 4  is a front view illustrating a control device in a state in which a knob of an embodiment of the present invention has been turned to a first turn position. 
         FIG. 5  is a front view illustrating a control device in a state in which a knob of an embodiment of the present invention has been turned to a second turn position. 
         FIG. 6  is a diagram illustrating a control circuit and the like of an embodiment of the present invention. 
         FIG. 7  is a table illustrating relationships between ON and OFF states of switches, detection signals, and control signals in an embodiment of the present invention. 
     
    
    
     Description of Embodiments 
     At least the following matters are made clear from the appended drawings and description of the present specification. 
     ===Residence=== 
     Explanation follows regarding a residence according to a present embodiment, with reference to  FIG. 1 .  FIG. 1  illustrates a residence of the present embodiment. Note that  FIG. 1  illustrates a state of a residence  100  as viewed from a ceiling side (+Z) toward a floor side (−Z). 
     The residence  100  is, for example, one unit of a building with multiple residents, such as an apartment building for single occupants or the like. The residence  100  may also be, for example, one room of a detached house, or one room of an office. 
     The residence  100  includes a door  2 , a control device  3 , walls  11 , an outlet device  12  (cutoff device, supply device), and an electrical device  16 . Note that, for example, plural doors  2 , control devices  3 , outlet devices  12 , and electrical devices  16  may be respectively provided. The control device  3  and the outlet device  12  correspond to a power control device. 
     The walls  11  partition a room interior  101  from a room exterior  102  of the residence  100 . 
     The door  2  is a hinged door provided at a specific position in the walls  11 . 
     The electrical device  16  is an electrical device such as a television, an air conditioner, a printer, or a personal computer provided in the room interior  101 . The electrical device  16  operates using power supplied from an alternating current source G 1  via the outlet device  12 . The electrical device  16  includes a power cable  15 . 
     One end of the power cable  15  is connected to the electrical device  16 , and the other end of the power cable  15  is provided with a plug  15 A. The plug  15 A is connected to the outlet device  12 . 
     The outlet device  12  supplies power, or cuts off power supply, to the electrical device  16  connected to the outlet device  12  with the plug  15 A. The outlet device  12  includes a switch  14  and a switch control device  13 . 
     The switch  14 , between the alternating current source G 1  and the electrical device  16 , switches ON or OFF. For example, when the switch  14  is switched ON, the alternating current source G 1  and the electrical device  16  are electrically connected, and power is supplied from the alternating current source G 1  to the electrical device  16 . However, for example when the switch  14  is switched OFF, the alternating current source G 1  and the electrical device  16  are electrically isolated from each other, and power is no longer supplied from the alternating current source G 1  to the electrical device  16 . 
     The switch control device  13  receives first and second control signals output from the control device  3 , and controls ON and OFF switching of the switch  14  based on the received control signals. 
     The control device  3  outputs the first control signal or the second control signal that control the switch control device  13  based on a turn position of a knob  22  of a thumb turn  20  ( FIG. 2 ). 
     ===Door=== 
     Explanation follows regarding the door of the present embodiment, with reference to  FIG. 2 .  FIG. 2  is an exploded perspective view illustrating the door and the control device of the present embodiment. Note that for ease of explanation, an “at home” switch  35  ( FIG. 4 ), a motion sensor  36  (detection device) and a wireless communication section  34 , which are provided on the front face of a main body  33  (housing), are omitted from illustration in  FIG. 2 . Although first piezoelectric elements  43 ,  44 , second piezoelectric elements  41 ,  42 , a hollow portion  33 B, and engagement holes  331 ,  332  are in a state not normally visible, for ease of explanation they are indicated in  FIG. 2  by dashed lines. 
     The door  2  includes the thumb turn  20  and a deadbolt  211 . 
     The thumb turn  20  is provided on the room interior  101  side of the door  2 . The thumb turn  20  includes a body  21  and the knob  22 . 
     A Z-axis is an axis running along a vertical direction. A direction running from a lower side toward an upper side is denoted by +Z, and a direction running from the upper side toward the lower side is denoted by −Z. A Y-axis is an axis running along a turn axis of the knob  22  of the thumb turn  20 . A direction running from the room interior  101  side toward the room exterior  102  side is denoted by +Y, and a direction running from the room exterior  102  side toward the room interior  101  side is denoted by −Y. An X-axis is an axis orthogonal to the Y-axis and the Z-axis, and runs along a direction of movement of the deadbolt  211 . A direction in which the deadbolt  211  projects out from the door  2  is denoted by +X, and a direction in which the deadbolt  211  retracts into the door  2  is denoted by −X. 
     The body  21  is provided at a specific position on the door  2 . 
     The knob  22  is provided to the body  21 . The knob  22  is attached to the door  2  through the body  21  so as to be capable of turning about a turn axis along the Y-axis that is orthogonal to the door  2 . The knob  22  is capable of turning about approximately 90° in a clockwise direction as viewed from −Y toward +Y when in a state aligned with the vertical direction (Z-axis) ( FIG. 2 ). The knob  22  is then capable of turning about approximately 90° in a counterclockwise direction as viewed from −Y toward +Y when in a state aligned with the horizontal direction (X-axis) (not illustrated in the drawings). Note that the state in which the knob  22  is aligned with the vertical direction is a state in which the length direction of the knob  22  is aligned with the Z-axis, as illustrated in  FIG. 2 . Moreover, the state in which the knob  22  is aligned with the horizontal direction is a state in which the length direction of the knob  22  is aligned with the X-axis. 
     The position of the knob  22  when the knob  22  is aligned with the X-axis is denoted as the first turn position of the knob  22 . The position of the knob  22  when the knob  22  is aligned with the Z-axis is denoted as the second turn position of the knob  22 . The knob  22  is turned to the first turn position or turned to the second turn position. 
     Note that the knob  22  is also turned to either the first or the second turn position by turn operation of a key inserted into a keyhole provided on the room exterior  102  side of the door  2 . Namely, the knob  22  is turnable from both the room interior  101  side, and from the room exterior  102  side. 
     The deadbolt  211  projects out from the door  2  and retracts into the door  2  according to turning of the knob  22 . For example, the deadbolt  211  projects out from the door  2  when the knob  22  is turned to the first turn position. The knob  22  retracts inside the door  2  when the knob  22  is turned to the second turn position. The door  2  is therefore locked when the knob  22  is turned toward the first turn position in a closed state of the door  2 . The door  2  is then unlocked when the knob  22  is turned toward the second turn position. 
     ===Control Device Structure=== 
     Explanation follows regarding the control device of the present embodiment, with reference to  FIG. 2  and  FIG. 3 .  FIG. 3  is a side view illustrating the door and the control device of the present embodiment. 
     The control device  3  is detachably attached to the door  2  on the room interior  101  side. The control device  3  includes an attachment plate  31 , a cover  32 , and a main body  33 . 
     =Attachment Plate= 
     The attachment plate  31  is a plate member attached to a room interior side face of the door  2 . For example, the attachment plate  31  has a substantially rectangular shape, and is formed using an insulating resin or the like. The attachment plate  31  is provided with an insertion hole  31 A and engagement tabs  311 ,  312 . 
     The thumb turn  20  is inserted through the insertion hole  31 A. The diameter of the insertion hole  31 A is set larger than the diameter of the body  21  so as to allow insertion of the body  21 . 
     The engagement tabs  311 ,  312  respectively project out toward −Y from both X-axis direction ends so as to engage with the main body  33  in a state in which the engagement tabs  311 ,  312  are inserted into the engagement holes  331 ,  332  of the main body  33 . 
     =Main Body= 
     The main body  33  is a main body of the control device  3 , and is attached to the door  2  using the attachment plate  31 . The main body  33  has, for example, a substantially rectangular column shape, and is formed from an insulating resin or the like. The main body  33  is provided with an exposure hole  33 A, the engagement holes  331 ,  332 , the first piezoelectric elements  43 ,  44 , the second piezoelectric elements  41 ,  42 , and the hollow portion  33 B. 
     The engagement holes  331 ,  332  are holes with which the engagement tabs  311 ,  312  detachably engage, and are provided at positions facing the engagement tabs  311 ,  312 . Namely, the main body  33  is detachable with respect to the attachment plate  31 . 
     The exposure hole  33 A is, for example, a circular hole that exposes the cover  32 . The exposure hole  33 A is provided at a position facing the thumb turn  21 . A ridge portion  333  is formed inside the exposure hole  33 A of the main body  33 . The ridge portion  333  is a protrusion employed during attachment of the cover  32  to the main body  33 , and is provided around the entire circumference of the exposure hole  33 A. The ridge portion  333  has a shape so as to be inserted into a groove  323  of the cover  32 . The exposure hole  33 A also functions as an attachment hole for attaching the cover  32  to the main body  33  so as to be capable of turning. The diameter of the exposure hole  33 A is set larger than the diameter of the cover  32 , such that the cover  32  can be provided inside the exposure hole  33 A. The cover  32  that is exposed from the exposure hole  33 A when the cover  32  is attached to the main body  33  is turnably operated. 
     The hollow portion  33 B is a cavity that houses the cover  32  attached to the main body  33  such that the cover  32  is capable of turning. The hollow portion  33 B is open on the +Y side, and is in communication with the exposure hole  33 A on the −Y side. 
     The first piezoelectric elements  43 ,  44  and the second piezoelectric elements  41 ,  42  are elements that generate power when pressed by projection tabs  321 ,  322  of the cover  32 . The first piezoelectric elements  43 ,  44  and the second piezoelectric elements  41 ,  42  are provided in the hollow portion  33 B of the main body  33 . Note that the first piezoelectric elements  43 ,  44  and the projection tabs  321 ,  322  correspond to a first detection device. The second piezoelectric elements  41 ,  42  and the projection tabs  321 ,  322  correspond to a second detection device. 
     The respective first piezoelectric elements  43 ,  44  are provided at positions that are pressed by the projection tabs  321 ,  322  when the knob  22  is turned to the first turn position when the control device  3  is attached to the door  2 . The first piezoelectric elements  43 ,  44  are, for example, provided on either side of the exposure hole  33 A in the vertical direction. 
     The second piezoelectric elements  41 ,  42  are respectively provided at positions that are pressed by the projection tabs  321 ,  322  when the knob  22  is turned to the second turn position with the control device  3  attached to the door  2 . The second piezoelectric elements  41 ,  42  are, for example, provided on either side of the exposure hole  33 A in the horizontal direction. 
     =Cover= 
     The cover  32  is attached to the thumb turn  20 , and turns together with the knob  22 . The cover  32  is, for example, formed from an insulating resin or the like. The cover  32  includes a main body  324 , the projection tabs  321 ,  322 , and a knob  325 . Note that the main body  324 , the projection tabs  321 ,  322 , and the knob  325  may be integrally formed to one another. 
     The main body  324  has a tube shape, for example, so as to enable insertion of the thumb turn  20 . An opening (not illustrated in the drawings) where the thumb turn  20  is inserted inside the main body  324  is provided on the +Y side of the main body  324 . The knob  325  is provided on the −Y side of the main body  324 . The groove  323  into which the ridge portion  333  of the main body  33  is inserted is provided at an outer peripheral face of the main body  324 . The groove  323  is a groove employed to attach the cover  32  to the main body  33 , and is provided around the entire circumference of the cover  32 . 
     The knob  22  fits into the knob  325 , thereby fixing the knob  325  to the knob  22 . The knob  325  has a hollow shape. The inside of the knob  325  is in communication with the inside of the main body  324 . Accordingly, when the thumb turn  20  is inserted into the cover  32 , the knob  22  fits into the knob  325  at the inside of the cover  32 . The knob  325  is thereby fixed to the knob  22 . 
     The projecting tabs  321 ,  322  have substantially rectangular column shapes, for example, and are tabs that are pressed against the first piezoelectric elements  43 ,  44  and the second piezoelectric elements  41 ,  42 . The projecting tabs  321 ,  322  project out from the outer peripheral face of the main body  324 . The projecting tabs  321 ,  322  project out in a direction away from the main body  324  in an XZ plane. The projecting tabs  321 ,  322  are provided on both sides of the main body  324  such that the length direction of the projecting tabs  321 ,  322  is substantially orthogonal to the length direction of the knob  325 . Note that, for example, the projecting tabs  321 ,  322  may each have a substantially circular column shape, or may have a polygonal column shape other than a rectangular column shape. 
     =Attachment of Control device to Door= 
     The attachment plate  31  is attached to the door  2  in a state in which the thumb turn  20  is inserted into the insertion hole  31 A. The attachment plate  31  may be fixed using screws, or may be fixed using double-sided adhesive tape, adhesive, hook-and-loop fasteners, or the like. 
     The cover  32  is attached to the exposure hole  33 A of the main body  33 . When this is performed, a leading end of the ridge portion  333  is inserted into the groove  323 , such that the ridge portion  333  catches in the groove  323 , thereby preventing the cover  32  from coming away from the main body  33 , for example under its own weight. Moreover, when this has been performed, the cover  32  is capable of turning about a turn shaft  32 B ( FIG. 4 ) passing through the center of the cover  32  and running along the Y-axis. 
     The main body  33  is attached to the attachment plate  31  in an attached state of the cover  23  to the main body  33 . The engagement tabs  311 ,  312  engage with the main body  33  in an inserted state of the engagement tabs  311 ,  312  into the engagement holes  331 ,  332 , thereby fixing the main body  33  to the attachment plate  31 . The control device  3  is attached to the door  2  in this manner. 
     =Control Circuit, etc. = 
     Explanation follows regarding a control circuit and the like of the present embodiment, with reference to  FIG. 4  to  FIG. 6 .  FIG. 4  is a front view illustrating the control device of the present embodiment in a state in which the knob has been turned to the first turn position.  FIG. 5  is a front view illustrating the control device of the present embodiment in a state in which the knob has been turned to the second turn position.  FIG. 6  is a diagram illustrating a control circuit and the like of the present embodiment. 
     Note that although the second piezoelectric elements  41 ,  42 , the first piezoelectric elements  43 ,  44 , and the projecting tabs  321 ,  322  are in a state not normally visible, they are indicated in  FIG. 4  and  FIG. 5  by dashed lines for ease of explanation. 
     The control device  3  includes the wireless communication section  34 , the “at home” switch  35 , the motion sensor  36 , a switch device  350  ( FIG. 6 ), and a control circuit  51 . 
     An antenna  52  of the control circuit  51  is provided to the wireless communication section  34  for communicating wirelessly with the switch control device  13 . 
     The “at home” switch  35  is a mechanical position-holding push-button switch that is employed to switch switches  351  to  354  of the switch device  350  (disabling device) ON or OFF. Each time the “at home” switch  35  is pushed, the “at home” switch  35  is held at a first position projecting out from the main body  33 , or at a second position retracted inside the main body  33 . 
     The switches  351  to  354  are respectively switched ON or OFF in synchronization with each other each time the “at home” switch  35  is pushed. For example, when the “at home” switch  35  is held at the first position, all of the switches  351  to  354  are switched ON. However, for example, when the “at home” switch  35  is held at the second position, all of the switches  351  to  354  are switched OFF. Note that since the “at home” switch  35  is a mechanical switch, power is not required in order to switch the switches  351  to  354  ON and OFF. 
     The motion sensor  36  is, for example, an infrared sensor that detects whether or not a person is present in the room. interior  101 . For example, when the motion sensor  36  detects the presence of a person in the room interior  101 , the motion sensor  36  outputs a detection signal to the control circuit  51 . However, when the motion sensor  36  detects that nobody is present in the room interior  101 , for example, the motion sensor  36  does not output a detection signal. The motion sensor  36  operates when supplied with power generated by at least one of the first piezoelectric elements  43 ,  44  or the second piezoelectric elements  41 ,  42  (also referred to as the “respective piezoelectric elements”). This thereby enables a reduction in the power consumption in the room interior  101 , including that of the control device  3 . 
     The control circuit  51  is supplied with power generated by the respective piezoelectric elements, as well as with detection signals output from the motion sensor  36 . The control circuit  51  outputs the first or second control signals as wireless signals through the antenna  52  according to which piezoelectric elements out of the respective piezoelectric elements are supplying power, and whether or not a detection signal has been supplied. The control circuit  51  operates when supplied with power generated by at least one piezoelectric element out of the respective piezoelectric elements. This thereby enables a reduction in the power consumption in the room interior  101 , including that of the control device  3 . 
     For example, when a detection signal is supplied to the control circuit  51 , the control circuit  51  does not output the first or second control signals, regardless of whether or not power is being supplied to the control circuit  51  from the respective piezoelectric elements. 
     For example, when power generated by either one of the first piezoelectric elements  43 ,  44  is supplied to the control circuit  51  when a detection signal is not being supplied to the control circuit  51 , the control circuit  51  outputs the first control signal to switch OFF the switch  14 . For example, when power generated by either one of the second piezoelectric elements  41 ,  42  is supplied to the control circuit  51  when a detection signal is not being supplied to the control circuit  51 , the control circuit  51  outputs the second control signal to switch ON the switch  14 . 
     For example, when the switches  351  to  354  are all switched ON, connections are made between each of the respective piezoelectric elements and the control circuit  51  such that power is supplied from the respective piezoelectric elements to the control circuit  51 . For example, when the switches  351  to  354  are all switched OFF, each of the respective piezoelectric elements is isolated from the control circuit  51  such that the respective piezoelectric elements do not supply power to the control circuit  51 . Namely, when the switches  351  to  354  are all switched OFF, the control circuit  51  does not operate, and is in a state in which the first and second control signals are not output. 
     ===Control Device Operation=== 
     Explanation follows regarding the control circuit and the like of the present embodiment, with reference to  FIG. 4 ,  FIG. 5 , and  FIG. 7 .  FIG. 7  is a table illustrating relationships between ON and OFF states of the switches, detection signals, and control signals in the present embodiment. 
     =Case 1= 
     For example, when the occupant of the residence  100  is present in the room interior  101 , the “at home” switch  35  is pressed so as to hold the “at home” switch  35  at the second position to prevent control by the control device  3 . When this is performed, the switches  351  to  354  are all switched OFF. The control device  3  accordingly does not output the first or second control signals, regardless of whether or not the projecting tabs  321 ,  322  press the respective piezoelectric elements. 
     =Case 2= 
     For example, if the occupant of the residence  100  goes out in a state in which a friend of the occupant is present in the room interior  101 , the “at home” switch  35  is pressed so as to hold the “at home” switch  35  at the first position. When this is performed, the switches  351  to  354  are all switched ON. The occupant uses a key to turn the knob  22  to the first turn position in order to lock the door  2  from the room exterior  102  side. When this is performed, the cover  32  turns in an A 1  direction about the turn shaft  32 B ( FIG. 4 ), together with the knob  22 . Then, when the knob  22  has been turned to the first turn position, end portions of the projecting tabs  321 ,  322  press against the respective first piezoelectric elements  43 ,  44 . Power generated by the first piezoelectric elements  43 ,  44  is supplied to the motion sensor  36  and the control circuit  51 . 
     The motion sensor  36  detects that there is a person (the friend of the occupant of the residence  100 ) present in the room interior  101 , and transmits a detection signal to the control circuit  51 . The control circuit  51  operates with power supplied from the first piezoelectric elements  43 ,  44 ; however the control circuit  51  does not output the first or second control signals due to being input with the detection signal. 
     =Case 3= 
     &lt;Going Out&gt; 
     For example, when the occupant of the residence  100  goes out, the “at home” switch  35  is pressed so as to hold the “at home” switch  35  at the first position. When this is performed, the switches  351  to  354  are all switched ON. The occupant uses the key to turn the knob  22  to the first turn position so as to lock the door  2  from the room exterior  102  side. When this is performed, as described above, power generated by the first piezoelectric elements  43 ,  44  is supplied to the motion sensor  36  and the control circuit  51 . Note that when this is performed, the first piezoelectric elements  43 ,  44  and the projecting tabs  321 ,  322  detect that the knob  22  has been turned to the first turn position. 
     The motion sensor  36  detects that there is nobody present in the room interior  101 , and adopts a state in which the motion sensor  36  does not output a detection signal. The control circuit  51  operates with power supplied from the first piezoelectric elements  43 ,  44 , and outputs the first control signal. The switch control device  13  receives the first control signal and switches OFF the switch  14 . This thereby creates a state in which the electrical device  16  is not supplied with power from the alternating current source G 1 . This thereby enables a reduction in standby power consumption by the electrical device  16 . 
     &lt;Returning Home&gt; 
     Later, for example when the occupant of the residence  100  returns home, the occupant uses the key to turn the knob  22  to the second turn position so as to unlock the door  2  from the room exterior  102  side. 
     When this is performed, the cover  32  turns in an A 2  direction about the turn shaft  32 B ( FIG. 5 ), together with the knob  22 . Then, when the knob  22  has been turned to the second turn position, the end portions of the projecting tabs  321 ,  322  press against the respective second piezoelectric elements  41 ,  42 . Power generated by the second piezoelectric elements  41 ,  42  is supplied to the motion sensor  36  and the control circuit  51 . Note that when this is performed, the second piezoelectric elements  41 ,  42  and the projecting tabs  321 ,  322  detect that the knob  22  has turned to the second turn position. 
     The motion sensor  36  detects that there is nobody present in the room interior  101 , and adopts a state in which the motion sensor  36  does not output a detection signal. The control circuit  51  operates with power supplied from the second piezoelectric elements  41 ,  42 , and outputs the second control signal. The switch control device  13  receives the second control signal and switches ON the switch  14 . The electrical device  16  is thereby supplied with power from the alternating current source G 1 . 
     As described above, when the door  2  is locked, the first piezoelectric elements  43 ,  44  and the projecting tabs  321 ,  322  detect that the knob  22  provided on the room interior  101  side of the door  2  has turned to the first turn position. When the first piezoelectric elements  43 ,  44  and the projecting tabs  321 ,  322  have detected that the knob  22  has turned to the first turn position, the control device  3  and the outlet device  12  cut off the power supply to the electrical device  16  provided in the room interior  101 . This thereby enables power supplied to the electrical device  16  as standby power of the electrical device  16  to be cut off when the occupant of the residence  100  locks the door  2  when going out, for example. This thereby enables a reduction in the power consumption of the residence  100 . 
     Moreover, the projecting tabs  321 ,  322  turn together with the knob  22 . The first piezoelectric elements  43 ,  44  generate power when pressed by the projecting tabs  321 ,  322  when the knob  22  is turned to the first turn position. The first control signal is output based on the power generated by the first piezoelectric elements  43 ,  44 . On receipt of the first control signal, the outlet device  12  switches OFF the switch  14  so as to cutoff the power supply to the electrical device  16 . Note that the first control signal can be output utilizing the power generated by the first piezoelectric elements  43 ,  44 . A power supply to the control device  3  from the alternating current source G 1 , for example, in order to output the first control signal is thus rendered unnecessary. This thereby enables a further reduction in the power consumption of the residence  100 . 
     Moreover, a plurality of the projecting tabs  321 ,  322  and a plurality of the first piezoelectric elements  43 ,  44  are provided. The first control signal is output when at least one out of the first piezoelectric elements  43 ,  44  generates power. When this is performed, the outlet device  12  switches OFF the switch  14  so as to cut off the power supply to the electrical device  16 . This thereby enables the power supply to the electrical device  16  to be reliably cut off, even if, for example, one out of the first piezoelectric elements  43 ,  44  is not working. 
     Moreover, when the door  2  is unlocked, the second piezoelectric elements  41 ,  42  and the projecting tabs  321 ,  322  detect that the knob  22  provided on the room interior  101  side of the door  2  has turned to the second turn position. When the second piezoelectric elements  41 ,  42  and the projecting tabs  321 ,  322  detect that the knob  22  has turned to the second turn position, the control device  3  and the outlet device  12  supply power to the electrical device  16  provided in the room interior  101 . This, for example, enables power to be supplied to the electrical device  16  when the occupant of the residence  100  returns home and unlocks the door  2 . This enables the electrical device  16  to be placed in an operable state when the occupant of the residence  100  returns home, thereby enabling convenience to be raised for the occupant. 
     Moreover, the second piezoelectric elements  41 ,  42  generate power when pressed by the projecting tabs  321 ,  322  when the knob  22  is turned to the second turn position. The second control signal is output based on the power generated by the second piezoelectric elements  41 ,  42 . On receipt of the second control signal, the outlet device  12  switches ON the switch  14  so as to supply power to the electrical device  16 . The second control signal can be output utilizing the power generated by the second piezoelectric elements  41 ,  42 . A power supply to the control device  3  from the alternating current source G 1 , for example, in order to output the second control signal is thus rendered unnecessary. This thereby enables a reduction in the power consumption of the residence  100 . 
     Moreover, a plurality of the projecting tabs  321 ,  322  and a plurality of the second piezoelectric elements  41 ,  42  are provided. The second control signal is output when at least one out of the second piezoelectric elements  41 ,  42  generates power. When this is performed, the outlet device  12  switches ON the switch  14  so as to supply power to the electrical device  16 . This thereby enables power to be reliably supplied to the electrical device  16 , even if, for example, one out of the second piezoelectric elements  41 ,  42  is not working. 
     Moreover, the motion sensor  36  detects whether or not a person is present in the room interior  101 . When the motion sensor  36  detects that there is nobody present in the room interior  101 , and the first piezoelectric elements  43 ,  44  and the projecting tabs  321 ,  322  detect that the knob  22  has turned to the first turn position, the outlet device  12  cuts off the power supply to the electrical device  16 . Moreover, when the motion sensor  36  detects that a person is present in the room interior  101 , and the first piezoelectric elements  43 ,  44  and the projecting tabs  321 ,  322  detect that that the knob  22  has turned to the first turn position, the outlet device  12  does not cut off the power supply to the electrical device  16 . This thereby enables a reduction in the power consumption of the residence  100 , while maintaining convenience in the residence  100 . 
     Moreover, when the switches  351  to  354  of the switch device  350  are all switched OFF, the outlet device  12  is disabled from cutting off the power supply to the electrical device  16  regardless of whether or not the first piezoelectric elements  43 ,  44  and the projecting tabs  321 ,  322  have detected turning of the knob  22 . This, for example, enables the power supply to the electrical device  16  to be prevented from being cut off when the occupant of the residence  100  is present in the room interior  101  Namely, this enables convenience to be raised for the occupant of the residence  100 . 
     Moreover, the cover  32  has a shape that conforms to the external profile of the knob  22  and covers the knob  22 , and the projecting tabs  321 ,  322  are fixed to the cover  32 . The cover  32  turns together with the knob  22 . The main body  33  includes the exposure hole  33 A that exposes the cover  33  such that the cover  33  can be turnably operated. The main body  33  houses the cover  32 , the projecting tabs  321 ,  322 , the second piezoelectric elements  41 ,  42 , and the first piezoelectric elements  43 ,  44 . 
     Moreover, the main body  33  is detachably provided to the room interior  101  side of the door  2 . Thus, maintenance of the main body  33 , for example, is comparatively easy. 
     The foregoing embodiment is for facilitating the understanding of the present invention, and is not to be construed as to limit the present invention. The present invention may be modified and/or improved without departing from the gist thereof, and the present invention encompasses equivalents thereof. 
     In the foregoing embodiment, explanation has been given in which two of each of the first piezoelectric elements  43 ,  44 , the second piezoelectric elements  41 ,  42 , and the projecting tabs  321 ,  322  are provided; however there is no limitation thereto. For example, three or more of each may be provided, or a single one of each may be provided. 
     Moreover, explanation has been given in which the motion sensor  36  operates using power output from the respective piezoelectric elements. However, there is no limitation thereto. For example, the motion sensor  36  may operate using power supplied by a battery or the like that supplies the motion sensor  36  with power. 
     REFERENCE SIGNS LIST 
       2 : door 
       3 : control device 
       12 : outlet device 
       16 : electrical device 
       22 : knob 
       41 ,  42 : second piezoelectric elements 
       43 ,  44 : first piezoelectric elements 
       321 ,  322 : projecting tabs