JP2014223161A - Toilet seat/toilet lid opening/closing device - Google Patents

Abstract

In a toilet seat / toilet lid opening / closing device that can be automatically opened and closed by a motor, current caused by an electromotive force generated when a manual opening / closing operation is performed is prevented from propagating to a device outside a motor drive circuit. To provide a toilet seat and toilet lid opening and closing device. When a position detecting means detects that an opening / closing member selected from at least one of a toilet seat and a toilet lid is in a fully open position or a fully closed position, a protection circuit is formed in the motor drive circuit or the motor drive circuit Connected to. The protection circuit circulates or releases the electromotive force generated in the motor when the opening / closing member is opened / closed by an external force regardless of the driving force of the motor to the circulation or ground potential. The motor drive circuit is an H-bridge circuit, and the protection circuit is preferably formed in the H-bridge circuit by turning on a part of the switching elements of the H-bridge circuit. [Selection] Figure 3

Description

  The present invention relates to a toilet seat / toilet lid opening / closing device, and more particularly to a toilet seat / toilet lid opening / closing device that can be automatically opened and closed by a motor.

  A toilet seat device is generally known in which a toilet seat and a toilet lid attached to a toilet bowl are automatically opened and closed by being driven by a motor. In this type of toilet seat / toilet lid opening / closing device, an H-bridge circuit is often used for driving the motor so that a single motor can drive the movement in the closing direction and the movement in the opening direction. FIG. 10 shows an example of an H bridge circuit. In the H-bridge circuit 100, by turning on one of the pair of closed control switching elements Sc1 and Sc2 or the pair of open control switching elements So1 and So2, the direction of driving the closing motion or the direction of driving the opening motion The motor M can be rotated. Protection diodes Dc1, Dc2, Do1, and Do2 are connected between the terminals of the switching elements Sc1, Sc2, So1, and So2 to protect the switching elements from the back electromotive force generated when the motor M is started or stopped. It is common to be done.

  Even when a toilet seat and toilet lid that can be automatically opened and closed by a motor are provided, the user may manually open and close the toilet seat and toilet lid regardless of the driving force of the motor. When such a manual opening / closing operation is performed, an electromotive force is generated in the motor. FIG. 10 shows the manually closed electromotive force Ec generated during the manual closing operation and the manually disclosed electromotive force Eo generated during the manual opening operation. When such a manual closing electromotive force Ec is generated in a state in which all the switching elements Sc1, Sc2, So1, So2 are in the OFF state, the first opening connected to the high potential side of the motor M in the forward direction. Current flows through the control protection diode Do1 (manual closing current Cc). Further, when the electromotive force Eo at the time of manual opening is generated, a current flows through the first closed control protection diode Dc1 connected in the forward direction to the high potential side of the motor M (manual opening current Co). The manual closing current Cc and the manual opening current Co propagate to the upstream side of the H-bridge circuit 100, and there is a risk of damaging the equipment provided upstream such as the power supply P.

  By the way, Patent Document 1 discloses that when a toilet seat and / or a toilet lid driven by a motor is manually opened and closed, the toilet seat and / or the toilet lid are used for the purpose of suppressing electric power consumption and impact caused by a collision with a toilet bowl or the like. A configuration of a brake circuit that short-circuits between terminals of a coil constituting the motor when the opening / closing angular velocity of the motor becomes a predetermined value or more is shown.

JP-A-2004-525

  The brake circuit disclosed in Patent Document 1 is considered to also have a function of preventing the electromotive force generated when the toilet seat and / or the toilet lid are manually opened and closed from propagating upstream of the H bridge circuit. . However, since the opening / closing angular velocity of the toilet seat and / or toilet lid is monitored and the brake circuit is connected after this angular velocity reaches a predetermined value, the predetermined angular velocity is detected after the user starts a manual opening / closing operation. Until then, the brake circuit does not function. Then, the electric current generated by the electromotive force generated in the motor during this period propagates to the upstream side of the H bridge circuit, and there is a risk of damaging the upstream equipment such as the power supply.

  The problem to be solved by the present invention is that in a toilet seat / toilet lid opening / closing apparatus that can be automatically opened and closed by a motor, a current caused by an electromotive force generated when a manual opening / closing operation is performed is a device external to the motor drive circuit. An object of the present invention is to provide a toilet seat / toilet lid opening / closing device that is prevented from propagating to the toilet.

  In order to solve the above problems, a toilet seat / toilet lid opening / closing device according to the present invention includes an opening / closing member selected from at least one of a toilet seat and a toilet lid, a motor for driving an opening / closing movement of the opening / closing member, and the opening / closing member. Position detecting means for detecting the opening / closing position of the motor, a motor driving circuit for supplying driving power to the motor, and an electromotive force generated in the motor when the opening / closing member is opened / closed by an external force regardless of the driving force of the motor. A protection circuit that circulates or discharges to a ground potential in a closed circuit, and the protection circuit detects the motor drive circuit when the position detecting unit detects that the opening / closing member is in the fully open position or the fully closed position. It is formed inside or connected to the motor driving circuit.

  Here, the motor drive circuit includes a pair of closed control switching elements that can drive the opening and closing member in the closing direction by turning on and a pair that can drive the opening and closing member by turning on. H switching circuit having four switching elements of the open control switching element, and a protection diode connected to each of the switching elements, the protection circuit by turning on a part of the switching element, Preferably, it is formed in the H-bridge circuit.

  Furthermore, the protection circuit may be formed by turning on at least one of the pair of closed control switching elements when the opening / closing member is in a fully open position.

  The protection circuit may be formed by turning on at least one of the pair of open control switching elements when the opening / closing member is in a fully closed position.

  Alternatively, in the protection circuit, when the opening / closing member is in the fully open position and in the fully closed position, the closed control switching element on the low potential side of the pair of closed control switching elements is turned on, Of the pair of open control switching elements, the open control switching element on the low potential side is preferably turned on.

  Further, the protection circuit is configured such that when the opening / closing member is in the fully open position and in the fully closed position, the close control switching element on the high potential side of the pair of close control switching elements is turned on, The pair of open control switching elements is preferably formed by turning on the high potential side open control switching element.

  In the toilet seat / toilet lid opening / closing device according to the present invention, when the opening / closing member selected from at least one of the toilet seat and the toilet lid is in the fully open position or the fully closed position, the protection circuit is formed in the motor drive circuit or Since it is connected to the motor drive circuit, is the current caused by the generated electromotive force circulated in the protection circuit when a manual closing operation from the fully open position or a manual opening operation from the fully closed position is performed? Or open to ground potential by a protection circuit. As a result, the current caused by the electromotive force is prevented from propagating to the outside of the motor drive circuit and affecting devices outside the motor drive circuit. Since the position of the opening / closing member when manual operation is started is almost limited to the fully open position or the fully closed position, a protection circuit is always formed in the motor drive circuit while the opening / closing member is in the fully closed position or the fully open position. Alternatively, by connecting to the motor drive circuit, such a protection function by the protection circuit can be used from the initial stage of manual operation, and current propagation to the outside of the motor drive circuit can be prevented.

  Here, the motor drive circuit is an H-bridge circuit, and the protection circuit is formed in the H-bridge circuit by turning on a part of its switching elements, so that the conventional motor drive circuit By using the H bridge circuit used in the toilet seat / toilet lid automatic opening / closing device and its control system, a protection circuit can be configured without using other members or circuits. Therefore, in a conventional general toilet seat / toilet lid automatic opening / closing device, it is possible to construct a protection circuit that does not propagate the current caused by the electromotive force by manual operation to the outside of the H bridge circuit in a simple and inexpensive manner.

  Further, according to the configuration in which the protection circuit is formed by turning on at least one of the pair of closing control switching elements when the opening / closing member is in the fully open position, the manual closing operation is performed. The current caused by the generated electromotive force can be circulated in the H bridge circuit from the initial stage of the manual closing operation without being propagated outside the H bridge circuit.

  Further, according to the configuration in which the protection circuit is formed by turning on at least one of the pair of opening control switching elements when the opening / closing member is in the fully closed position, the manual opening operation is performed. The current caused by the electromotive force generated in the circuit can be circulated in the H bridge circuit from the initial stage of the manual opening operation without being propagated outside the H bridge circuit.

  Alternatively, when the protection circuit is in the fully open position and in the fully closed position, the low potential side closed control switching element of the pair of closed control switching elements is turned on, and the pair of open controls Among the switching elements, according to the configuration formed by turning on the open control switching element on the low potential side, it is caused by the electromotive force generated when any of the manual opening operation and the closing operation is performed. The current to be circulated can be circulated in the H bridge circuit without being propagated outside the H bridge circuit from the initial stage of the manual opening / closing operation. Since it is not necessary to change the on / off state of the switching element between the fully open state and the fully closed state, the control mode of the switching element is simplified.

  In addition, when the open / close member is in the fully open position and in the fully closed position, the high-potential side close control switching element of the pair of close control switching elements is turned on and the protection circuit is turned on. Of the switching elements, the configuration is formed by turning on the open control switching element on the high potential side, and it is caused by the electromotive force generated when either the manual opening operation or the closing operation is performed. The current can be circulated in the H bridge circuit from the initial stage of the manual opening / closing operation without being propagated outside the H bridge circuit. Also in this case, since it is not necessary to change the on / off state of the switching element between the fully open state and the fully closed state, the control mode of the switching element is simplified.

It is a perspective view showing an example of a toilet seat and a toilet lid provided with a toilet seat / toilet lid opening / closing device according to an embodiment of the present invention. It is a circuit diagram which shows an example of the motor drive circuit of the toilet seat opening / closing apparatus concerning 1st embodiment of this invention. In the said motor drive circuit, it is a circuit diagram which shows the state at the time of toilet seat full open. In the said motor drive circuit, it is a circuit diagram which shows the state at the time of toilet seat full closure. It is a flowchart which shows the control method of the said toilet seat opening / closing apparatus. In the motor drive circuit of the toilet seat opening / closing apparatus concerning 2nd embodiment of this invention, it is a circuit diagram which shows the structure at the time of toilet seat full open and full close. It is a circuit diagram which shows the structure at the time of toilet seat full open in the motor drive circuit of the toilet seat opening / closing apparatus concerning 3rd embodiment of this invention. It is a circuit diagram which shows the state at the time of toilet seat full closure in the motor drive circuit of the toilet seat opening / closing apparatus concerning the said 3rd embodiment. In the motor drive circuit of the toilet seat opening / closing apparatus concerning 4th embodiment of this invention, it is a circuit diagram which shows the state at the time of toilet seat full open and full close. It is a circuit diagram which shows the motor drive circuit of the conventional general toilet seat and toilet lid opening / closing apparatus.

  Hereinafter, a toilet seat / toilet lid opening / closing device according to an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1, a toilet seat / toilet lid device according to an embodiment of the present invention is a drive device for opening and closing a toilet seat 2 and / or a toilet lid 3 provided on the upper surface of a toilet 1 so as to be opened and closed by rotation. It is. The toilet lid 3 is attached to the back of the toilet 1 via a rotation shaft 4. The toilet seat 2 is also attached to the back of the toilet 1 via a similar rotation shaft. In the state of FIG. 1, a motor is connected to the rotation shaft of the toilet seat 2 and / or the toilet lid 3, and the toilet seat 2 and / or the toilet lid 3 are automatically operated by the rotation of the motor regardless of the user's hand. It can be opened and closed. The opening / closing operation of the toilet seat 2 and / or the toilet lid 3 by the motor is performed by the user operating input means such as a remote control switch. Alternatively, the opening / closing operation of the toilet seat 2 and / or the toilet lid 3 by the motor may be performed based on a signal from a sensor or the like that detects the presence of the user. The toilet seat 2 and / or the toilet lid 3 can be manually opened and closed by the user in addition to automatic opening and closing by the driving force of the motor.

  Further, the toilet seat / toilet lid opening / closing device according to the present embodiment includes position detection means (not shown) for detecting the opening / closing positions of the toilet seat 2 and / or the toilet lid 3. The open / close position refers to a position in which the toilet seat 2 and / or the toilet lid 3 can be rotated, and in the state of FIG. 1, the toilet seat 2 rotates completely in the closing direction. The toilet lid 3 is in a fully opened state in which the toilet lid 3 is fully rotated in the opening direction. The position detection means is realized by a rotary encoder, for example. The opening / closing position of the toilet seat 2 and / or the toilet lid 3 detected by the position detection means is transmitted to a control unit (not shown) such as a microcomputer that is common to controlling a motor drive circuit described later.

  The toilet seat / toilet lid opening / closing device according to the present embodiment is characterized by controlling a motor drive circuit that performs an opening / closing operation of the toilet seat 2 and / or the toilet lid 3 based on information on the opening / closing position detected by the position detecting means. Have Hereinafter, although the motor drive circuit of the toilet seat opening and closing device that opens and closes the toilet seat 2 will be described as an example, the same configuration can be applied to the toilet lid opening and closing device that opens and closes the toilet lid 3. That is, in the toilet seat / toilet lid opening / closing apparatus that performs opening / closing movements of the opening / closing member selected from at least one of the toilet seat 2 and the toilet lid 3, the following configuration can be applied to the drive circuit that drives the motor.

  FIG. 2 shows the configuration of the motor drive circuit 10 provided in the toilet seat opening and closing device according to the first embodiment of the present invention. The motor drive circuit 10 has the same circuit configuration as the conventional general H bridge circuit as shown in FIG. That is, the first closed control switch Sc1 and the second open control switch So2 are connected in series, and the first open control switch So1 and the second closed control switch Sc2 are connected in series, and these are the output part of the power supply P. And in parallel between the ground potential. And, connecting the potential between the first closed control switch Sc1 and the second open control switch So2, and the potential between the first open control switch So1 and the second closed control switch Sc2, A motor M is connected. The first closed control switch Sc1 and the first open control switch So1 disposed on the higher potential side than the motor M are P-type field effect transistors (FETs), and are disposed on the lower potential side than the motor M. The second open control switch So2 and the second close control switch Sc2 are N-type FETs.

  Protection diodes Dc1, Do1, Do2, and Dc2 are connected between the source terminal and the drain terminal of each of the switches Sc1, So1, So2, and Sc2, each made of an FET. The protection diode (freewheeling diode) is for preventing the back electromotive force generated when the motor M is started and stopped from damaging the FET. The MOS-FET normally includes a parasitic diode, and in this case, the parasitic diode becomes the protection diodes Dc1, Do1, Do2, and Dc2.

  An output port of a common control unit (microcomputer or the like) that receives input of information on the opening / closing position of the toilet seat 2 from the position detection means at the gate terminal of each of the switches Sc1, So1, So2, Sc2 made of FETs. Pc1, Po1, Po2, and Pc2 are connected. And the ON / OFF state of each switch Sc1, So1, So2, Sc2 is controlled by the control unit via these output ports. Hereinafter, a state where conduction is formed between the source and drain of the FET is referred to as an on state of the switch, and a state where conduction is not formed is referred to as an off state.

  When driving the closing movement of the toilet seat 2, the control unit turns on the two closing control switches Sc1 and Sc2 and turns off the opening control switches So1 and So2. On the other hand, when the opening movement of the toilet seat 2 is driven, the two open control switches So1 and So2 are turned on, and the two closed control switches Sc1 and Sc2 are turned off.

  While the position detection means detects that the toilet seat 2 is in the fully open state, the control unit maintains the motor drive circuit 10 in the state shown in FIG. At this time, only the second closed control switch Sc2 is turned on, and the other switches Sc1, So1, So2 are turned off. In the circuit diagrams of FIGS. 3 to 9, each switch made of an FET is represented as a simple switch so that the on / off state can be easily understood.

  When the toilet seat 2 is in the fully open state, an electromotive force is generated in the motor M when the toilet seat 2 is rotated in the closing direction by an external force such as manual operation or gravity, regardless of the rotation of the motor M. The manual closing electromotive force Ec generates a manual closing current Cc. At this time, since the second closing control switch Sc2 is in the ON state, the manual closing current Cc is a path of motor M → second closing control switch Sc2 → second opening control protection diode Do2 → motor M. It circulates through the protection circuit formed as a closed circuit and is consumed as heat. By forming such a protection circuit, the manual closing current Cc is prevented from being propagated outside the motor drive circuit 10 such as the power supply P via the first open control protection diode Do1. . This prevents components such as the power supply P from being damaged by the manual closing current Cc. Although the current flowing through the first open control protection diode Do1 is not strictly zero, the internal resistance of the diode is generally much larger than the internal resistance of the FET. The propagation of the manual closing current Cc via the motor driving circuit 10 through the motor is reduced to a negligible level. In this specification, such a state is referred to as a state in which current propagation is prevented.

  If all the switches including the second closing control switch Sc2 are kept in the OFF state in the fully open state of the toilet seat, the manual closing current Cc is connected in the forward direction as shown in FIG. It flows through the first open control protection diode Do1 and propagates to the power source P. If the manual closing current Cc exceeds the ratings of the components constituting the power supply P, the power supply P may be damaged.

  On the other hand, while the position detecting unit detects that the toilet seat 2 is in the fully closed state, the control unit maintains the motor driving circuit 10 in the state shown in FIG. At this time, only the second open control switch So2 is turned on, and the other switches Sc1, So1, Sc2 are turned off.

  When the toilet seat 2 is in the fully closed state, an electromotive force is generated in the motor M when the toilet seat 2 is rotated in the opening direction by an external force such as a manual operation regardless of the rotation of the motor M. The manual opening electromotive force Eo generates a manual opening current Co. At this time, since the second open control switch So2 is in the ON state, the manual open-time current Co is a path of motor M → second open control switch So2 → second closed control protection diode Dc2 → motor M. It circulates through the protection circuit formed as a closed circuit and is consumed as heat. By forming such a protection circuit, the manual opening current Co is prevented from being propagated to the outside of the motor drive circuit 10 such as the power source P via the first closed control protection diode Dc1. . This prevents components such as the power source P from being damaged by the manual opening current Co.

  If all the switches including the second opening control switch So2 are maintained in the OFF state in the fully closed state of the toilet seat, the manual opening current Co is connected in the forward direction as shown in FIG. It flows through the first closed control protection diode Dc1 and propagates to the power source P. If the manual opening current Co exceeds the ratings of the components constituting the power supply P, the power supply P may be damaged.

  FIG. 5 shows a specific control method as a flowchart. In step S0, when the control unit is activated and the operation of the toilet seat opening / closing device is started, in step S1, the position detecting unit confirms the open / closed position of the toilet seat 2 and transmits it to the control unit.

  If the toilet seat 2 is in the fully open position, in step S2, the control unit turns on the second closing control switch Sc2, and sets the motor drive circuit 10 in the state shown in FIG. At this time, if any switches other than the second closed control switch Sc2 are in the on state, they are turned off.

  If the toilet seat 2 is in the fully closed position, in step S3, the control unit turns on the second open control switch So2, and sets the motor drive circuit 10 in the state shown in FIG. At this time, if switches other than the second open control switch So2 are in the on state, they are turned off.

  After a predetermined switch is turned on in step S2 or step S3, in step S4, the control unit determines whether the manual operation is continued by the user. If a manual operation is being performed, control specialized for the manual operation is performed in step S5. This is, for example, control such that the rotating shaft of the motor M is separated from the rotating shaft of the toilet seat 2 to allow free manual operation.

  On the other hand, if it is determined in step S4 that no manual operation is performed, it is checked in step S6 whether a remote control signal for automatically opening and closing the toilet seat 2 with the driving force of the motor M is input. If no remote control signal is input, that is, if the user has not instructed automatic opening / closing of the toilet seat 2, the process returns to step S1.

  If it is determined in step S6 that a remote control signal is input, automatic opening / closing control of the toilet seat 2 is performed in step S7. That is, according to the input remote control signal, the two open control switches So1 and So2 are turned on to automatically open the toilet seat 2, or the two closed control switches Sc1 and Sc2 are turned on and the toilet seat 2 is automatically turned on. Control such as closing is performed. When the automatic opening / closing control is completed, the process returns to step S1.

  In the control mode shown in FIG. 5, whether or not manual operation is performed is monitored in parallel with step S1 or alternately with step S1.

  As described above, in the toilet seat opening and closing device according to the present embodiment, when the toilet seat 2 is in the fully open state, the second close control switch Sc2 is always on, and when the toilet seat 2 is in the fully closed state, it is always The second open control switch So2 is turned on. Thereby, when the toilet seat 2 is manually opened and closed, the manual closing current Cc and the manual opening current Co due to the generation of the manual closing electromotive force Ec and the manual opening electromotive force Eo are driven by the motor from the initial stage of the opening and closing movement. Propagation outside the circuit 10 can be prevented, and damage to the power supply P or the like can be avoided.

  Even if the second closing control switch Sc2 or the second opening control switch So2 is turned on after detecting that the toilet seat 2 is manually operated based on the moving speed of the toilet seat 2 or the like, a manual closing current generated thereafter Propagation of Cc and manual opening current Co can be prevented. However, in this case, it is detected that the manual operation is performed, and the currents Cc and Co that are actually generated until the switch of the motor drive circuit 10 is completed are propagated to the outside of the motor drive circuit 10. As a result, the power supply P may be damaged. In contrast, in the present embodiment, the motor drive circuit 10 is always maintained in the above state while the toilet seat 2 is in the fully open state and in the fully closed state, so that any time a manual opening / closing operation is started. From the beginning, the currents Cc and Co can be prevented from propagating outside the motor drive circuit 10. The toilet seat 2 is fully open before the manual closing operation is started, and the toilet seat 2 is almost fully closed before the manual opening operation is started. Considering the propagation of the currents Cc and Co caused by the electromotive forces Ec and Eo by the manual operation in this way in the fully closed state, it is sufficient to effectively prevent the current propagation by the manual opening and closing operation. .

  The toilet seat opening and closing device according to the present embodiment can be configured by using a conventional general motor driving H-bridge circuit as it is and simply controlling the switch according to the opening and closing state of the toilet seat 2. Therefore, it is possible to easily and inexpensively manufacture a toilet seat opening and closing device in which damage to the power source P and the like due to generation of electromotive forces Ec and Eo due to manual opening and closing operations is prevented based on a conventional general H-bridge circuit. it can.

  By turning on a specific switch of the H bridge circuit that drives the motor M, a protection circuit that circulates the currents Cc and Co flowing by the electromotive forces Ec and Eo generated when the toilet seat 2 is manually opened and closed in the closed circuit is configured. However, the configuration for preventing the currents Cc and Co from propagating to the outside of the H-bridge circuit can be considered other than the first embodiment. Examples thereof are shown below. Description of points common to the first embodiment is omitted.

  FIG. 6 shows a configuration of the toilet seat opening / closing apparatus according to the second embodiment of the present invention when the toilet seat is fully opened and when the toilet seat is fully closed. Here, both when the toilet seat is fully opened and when it is fully closed, the second opening control switch So2 and the second closing control switch Sc2 provided on the low potential side of the motor M are turned on, and the first closing control switch Sc1. Then, the first open control switch So1 is turned off. Then, when the manual closing electromotive force Ec is generated by the manual closing operation when the toilet seat is fully opened, the manual closing current Cc passes through the motor M → the second closing control switch Sc2 → the second opening control switch So2 → the motor M. It circulates through a protection circuit formed as a closed circuit. On the other hand, when the manual opening electromotive force Eo is generated by the manual opening operation when the toilet seat is fully closed, the manual opening current Co is passed through the motor M → second opening control switch So2 → second closing control switch Sc2 → motor M. Circulates in a protection circuit formed as a closed circuit. As described above, regardless of whether the manual closing operation or the manual opening operation is performed, the currents Cc and Co generated by the generation of the electromotive forces Ec and Eo are circulated in the protection circuit as the closed circuit, As a result, the currents Cc and Co are prevented from propagating outside the motor drive circuit 20 and damaging the power source P and the like.

  In the motor drive circuit 20 in the second embodiment, the on / off state of the switch is the same both when the toilet seat is fully closed and when the toilet seat is fully opened. That is, the mode of switch control by the control unit is simpler than that of the motor drive circuit 10 in the first embodiment.

  FIG. 7 shows the motor drive circuit 30 in the toilet seat fully opened state for the toilet seat opening and closing device according to the third embodiment of the present invention. At this time, only the first closed control switch Sc1 is turned on, and the other switches So1, So2, Sc2 are turned off. Then, the manual closing current Cc that flows when the manual closing electromotive force Ec is generated by the manual closing operation of the toilet seat 2 is the motor M → the first opening control protection diode Do1 → the first closing control switch Sc1 → the motor M. It circulates in the protection circuit formed as a closed circuit via. The manual closing current Cc circulates through the protection circuit and is converted into heat, so that the manual closing current Cc is hardly transmitted to the outside of the motor drive circuit 30 such as the power supply P. Therefore, parts such as the power source P are prevented from being damaged by the manual closing current Cc.

  On the other hand, in the toilet seat opening and closing device according to the third embodiment, when the toilet seat 2 is in the fully closed state, the motor drive circuit 30 is in the state of FIG. At this time, only the first open control switch So1 is turned on, and the other switches Sc1, So2, Sc2 are turned off. Then, the manual opening current Co that flows when the manual opening electromotive force Eo is generated by the manual opening operation of the toilet seat 2 is expressed as follows: motor M → first closing control protection diode Dc1 → first opening control switch So1 → motor M. It circulates in the protection circuit formed as a closed circuit via. The manual closing current Co is circulated through the protection circuit and converted into heat, so that it hardly propagates outside the motor drive circuit 30 such as the power supply P. Therefore, it is possible to prevent parts such as the power source P from being damaged by the manual opening current Co.

  In the motor drive circuit 10 of the first embodiment and the motor drive circuit 30 of the third embodiment, one of the close control switches is turned on when the toilet seat is fully opened, and one of the open control switches when the toilet seat is fully closed. Is common in that one is turned on. In the motor drive circuit 10 of the first embodiment, the switch on the lower potential side than the motor M is turned on, and in the motor drive circuit 30 of the third embodiment, the switch on the higher potential side than the motor M is turned on. It is different in that it is turned on. Whichever form is adopted, it is possible to circulate the currents Cc and Co due to the electromotive forces Ec and Eo generated at the time of manual opening and closing in the closed circuit and prevent them from propagating to the outside.

  FIG. 9 shows a state of the motor drive circuit 40 when the toilet seat is fully opened and when the toilet seat is fully closed in the toilet seat opening and closing device according to the fourth embodiment as a modification of the toilet seat opening and closing device according to the third embodiment. When the toilet seat is fully opened and fully closed, the first closing control switch Sc1 and the first opening control switch So1 provided on the high potential side of the motor M are turned on, and the second opening control switch So2 and the second opening control switch So2 The closed control switch Sc2 is turned off. Then, when the manual closing electromotive force Ec is generated by the manual closing operation when the toilet seat is fully opened, the manual closing current Cc passes through the motor M → the first opening control switch So1 → the first closing control switch Sc1 → the motor M. It circulates through a protection circuit formed as a closed circuit. On the other hand, when the manual opening electromotive force Eo is generated by the manual opening operation when the toilet seat is fully closed, the manual opening current Co is passed through the motor M → the first closing control switch Sc1 → the first opening control switch So1 → the motor M. Circulates in a protection circuit formed as a closed circuit. As described above, regardless of whether the manual closing operation or the manual opening operation is performed, the currents Cc and Co generated by the generation of the electromotive forces Ec and Eo are circulated in the protection circuit as the closed circuit, As a result, the currents Cc and Co are prevented from propagating outside the motor drive circuit 40 and damaging the power supply P and the like.

  In the motor drive circuit 40 according to the fourth embodiment, as in the motor drive circuit 20 according to the second embodiment, the on / off state of the switch is the same both when the toilet seat is fully closed and when the toilet seat is fully opened. Yes. That is, the mode of switch control by the control unit is simpler than that of the motor drive circuit 30 in the third embodiment.

  As mentioned above, although embodiment of this invention was described in detail, this invention is not limited to the said Example at all, A various change is possible in the range which does not deviate from the summary of this invention. In the above-described embodiment, each switch is configured by an FET, but may be configured by another switching element such as a transistor.

  Further, in each of the above embodiments, a protection circuit as a closed circuit is included in the motor drive circuit by turning on a specific switch among the four switches of the motor drive circuit configured by the H bridge circuit. Formed. Then, the current caused by the electromotive force generated by the manual opening / closing operation of the toilet seat is circulated in this protection circuit and converted into heat, thereby preventing the current from propagating to the outside of the motor drive circuit. In this way, current propagation to the outside of the motor drive circuit can be prevented even by a configuration other than forming a protection circuit in the motor drive circuit using the components of the motor drive circuit. For example, a protection circuit may be formed as a closed circuit independent of the motor drive circuit, and the protection circuit may be connected to the motor drive circuit by an appropriate switching element when the toilet seat is fully opened and fully closed. Alternatively, a configuration of a protection circuit that uses a switching element to directly connect the terminal of the motor on the low potential side due to generation of electromotive force to the ground potential when the toilet seat is fully opened and fully closed can be exemplified. In this case, the current resulting from the electromotive force generated by the manual opening / closing operation of the toilet seat is released to the ground potential.

  Further, as in the above-described embodiment, the configuration in which a specific part of the switch of the H bridge circuit that drives the motor is turned on in the standby state is not limited to the toilet seat / toilet lid opening / closing device, and an H bridge circuit is used. Applied to various devices that can be operated by external force such as manual rotation by controlling forward / reverse rotation of the motor for the purpose of preventing the electromotive force generated by the rotation of the motor due to the external force from propagating to the outside. be able to.

DESCRIPTION OF SYMBOLS 1 Toilet 2 Toilet seat 3 Toilet lid 4 (Toilet lid) Rotating shaft 10, 20, 30, 40 Motor drive circuit M Motor P Power source Sc1 First close control switch Sc2 Second close control switch So1 First open control switch So2 second open control switch Dc1 first closed control protection diode Dc2 second closed control protection diode Do1 first open control protection diode Do2 second open control protection diode

Claims (6)

An opening / closing member selected from at least one of a toilet seat and a toilet lid, a motor for driving an opening / closing movement of the opening / closing member, a position detecting means for detecting an opening / closing position of the opening / closing member, and a motor for supplying driving power to the motor A driving circuit, and a protection circuit that circulates or releases the electromotive force generated in the motor to the ground potential in a closed circuit when the opening / closing member is opened / closed by an external force regardless of the driving force of the motor,
The toilet seat is formed in the motor drive circuit or connected to the motor drive circuit when the position detecting means detects that the opening / closing member is in the fully open position or the fully closed position. -Toilet lid opening / closing device. The motor drive circuit includes a pair of closing control switching elements that can drive the opening / closing member in a closing direction by turning on the state and a pair of opening controls that can drive the opening / closing member in an opening direction by turning on the state. An H-bridge circuit having four switching elements of the switching element and a protection diode connected to each of the switching elements;
2. The toilet seat / toilet lid opening / closing device according to claim 1, wherein the protection circuit is formed in the H bridge circuit by turning on a part of the switching element. 3.   The toilet seat according to claim 2, wherein the protection circuit is formed by turning on at least one of the pair of closed control switching elements when the opening / closing member is in a fully open position. -Toilet lid opening / closing device.   4. The protection circuit according to claim 2, wherein the protection circuit is formed by turning on at least one of the pair of open control switching elements when the opening / closing member is in a fully closed position. The toilet seat / toilet lid opening / closing device described.   The protection circuit is configured such that, when the opening / closing member is in a fully open position and in a fully closed position, of the pair of close control switching elements, a close control switching element on a low potential side is turned on, and the pair of close control switching elements The toilet seat / toilet lid opening / closing device according to any one of claims 2 to 4, wherein the opening control switching device on the low potential side among the open control switching devices is turned on. .   In the protection circuit, when the opening / closing member is in the fully open position and in the fully closed position, the close control switching element on the high potential side of the pair of close control switching elements is turned on, and the pair of close control switching elements The toilet seat / toilet lid opening / closing device according to any one of claims 2 to 4, wherein the opening control switching device on the high potential side is turned on among the open control switching devices. .

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