JP2020185095A - Toilet seat device - Google Patents

Abstract

To provide a toilet seat device capable of inhibiting seating detection from malfunctioning.SOLUTION: A toilet seat device includes a toilet seat, a heater 43, a heat diffusion part 41 for diffusing heat of the heater, a detection circuit 54 for detecting seating on the toilet seat by change in electrostatic capacity of the heat diffusion part, and a power supply circuit 50 for supplying power to the detection circuit. The power supply circuit includes a rectification circuit 60 for rectifying AC voltage supplied from an AC power source, a smoothing capacitor 62 for smoothing the rectified voltage rectified by the rectification circuit, and converting the same into DC voltage, and a conversion circuit 64 for converting the DC voltage generated by the conversion by the smoothing capacitor into DC voltage corresponding to the detection circuit. The conversion circuit include a transformer 66 that electrically isolate a primary side and a secondary side, and a primary side and secondary side coupling capacitor 71 that couples a primary side with the secondary side. The rectification circuit includes a rectifier diode 610 and a stabilization capacitor 620 which is connected to the rectifier diode in parallel and stabilizes electrostatic capacity of the heat diffusion part.SELECTED DRAWING: Figure 5

Description

Aspects of the present invention generally relate to toilet seat devices.

There is known a toilet seat device in which a heater is provided inside a hollow toilet seat so that the seating surface of the toilet seat can be warmed. In such a toilet seat device, a seating sensor for detecting the seating of a user or the like on the toilet seat is provided. For example, when the seating sensor does not detect seating, the temperature of the toilet seat is kept lower than the set temperature, and the temperature is warmed up to the set temperature according to the detection of seating. As a result, the power consumption of the toilet seat device can be suppressed.

The seating sensor includes a switch type and a capacitance type. The switch-type seating sensor detects the seating on the toilet seat by making the rotation shaft portion of the toilet seat movable in the vertical direction and detecting the downward movement of the rotation shaft portion due to seating with the switch. The capacitance type seating sensor is provided with a conductive detection electrode on the toilet seat, and detects seating by utilizing the fact that the capacitance of the detection electrode increases when the human body sits down. Therefore, in the capacitance type seating sensor, it is not necessary to move the toilet seat up and down, and it is possible to make the toilet seat device thinner as compared with the case where the switch type seating sensor is used.

In the capacitance type seating sensor, for example, as in Patent Document 1, the heat diffusion portion that diffuses the heat of the heater is used as a detection electrode, and the seating is detected by the change in capacitance between the detection electrode and the ground. There is a method. In this method, since the heat diffusion part is widely arranged over the entire toilet seat, the capacitance signal itself detected when the user sits down is large, and it is further affected by variations in the sitting style and physique of the person. There is a feature that it is rarely done. Further, since the existing heat diffusion portion is used as the detection electrode, there is an advantage that it is not necessary to newly provide a detection electrode for seating detection.

In a capacitance type seating sensor that uses a heat diffusion part as a detection electrode, the potential (GND) of the detection circuit (secondary side) that measures the capacitance is measured in order to measure the capacitance between the detection electrode and the ground. Must be stable to the earth in principle. However, the potential of the detection circuit (secondary side) does not have to be completely the same as that of the ground, and it is sufficient that the potential is coupled to the ground with an appropriate impedance so as not to interfere with the detection accuracy of the capacitance. In Patent Document 1, a capacitor is used to electrostatically couple the signal ground of the oscillation circuit, which is the detection circuit, and the AC power supply line, which is the ground ground.

Further, here, the primary side and the secondary side of the power supply circuit are DC-insulated by a transformer (isolation transformer) in order to avoid electric shock. Further, in order to suppress noise generated from the primary side of the power supply circuit, a capacitor (primary secondary coupling capacitor) is provided between the primary side and the secondary side.

However, the ratio of the ON-OFF period of the rectifying diode that rectifies the commercial power supply of the product controller varies depending on the operating state of the warm water washing toilet seat (washing the toilet, washing the toilet bowl, electric opening / closing operation, etc.). As a result, the change in the electrostatic coupling of the rectifier diode due to the fluctuation of ON-OFF of the rectifier diode is transmitted to the secondary side (detection circuit) via the primary secondary coupling capacitor, and the electrostatic seating signal loop is not generated. There was a problem that it became stable, the capacitance was not stable, and the seating determination was not stable.

As in Patent Document 1, there is a method of connecting the primary / secondary coupling capacitor directly to the AC power supply line in order to prevent it from being affected by the rectifier diode, but since it is also a coupling capacitor for safety standards, it is a component. There are concerns about increased costs and larger sizes.

Japanese Unexamined Patent Publication No. 6-138247

The present invention has been made based on the recognition of such a problem, and an object of the present invention is to provide a toilet seat device capable of suppressing malfunction of seating detection.

The first invention is provided with a toilet seat having an internal space and a seating surface, an inner surface facing the opposite side of the seating surface in the internal space, and an AC voltage from the outside provided in the internal space. A heater that warms the seating surface from the inside via the inner surface, and a conductivity that is provided on the inner surface and has a larger area than the heater and diffuses the heat of the heater to the inner surface. The heat diffusion unit is electrically connected to the heat diffusion unit, and the detection circuit that detects the seating on the toilet seat by the change in the capacitance of the heat diffusion unit is electrically connected to the AC power supply. The power supply circuit includes a power supply circuit that supplies power to the detection circuit, and the power supply circuit smoothes a rectifier circuit that rectifies the AC voltage supplied from the AC power supply and a rectifier voltage that is rectified by the rectifier circuit to obtain a DC voltage. It has a smoothing capacitor that converts to, and a conversion circuit that converts the DC voltage converted by the smoothing capacitor into a DC voltage corresponding to the detection circuit, and the conversion circuit has a primary side and a secondary side. It has a transformer that is electrically isolated and a primary / secondary coupling capacitor that couples the primary side and the secondary side, and the rectifier circuit is connected to the rectifier diode in parallel with the rectifier diode. It is a toilet seat device characterized by having a stabilizing capacitor for stabilizing the capacitance of the heat diffusion portion.

According to this toilet seat device, by providing a stabilizing capacitor in parallel with the rectifier diode, the rectifier circuit is capacitively coupled by the stabilizing capacitor even during the OFF period of the rectifier diode. Therefore, it is possible to suppress changes in electrostatic coupling due to fluctuations in ON-OFF of the rectifier diode. As a result, the ground potential on the secondary side can be stabilized, and it is possible to suppress the malfunction of the seating detection.

The second invention is the first invention, wherein the rectifier circuit is a full bridge circuit having four arms, and the stabilizing capacitor is provided only in one of the four arms. It is a characteristic toilet seat device.

According to this toilet seat device, the cost can be reduced and the size can be reduced by providing the stabilizing capacitor on only one of the four arms of the rectifier circuit.

A third aspect of the invention is the second invention, wherein the smoothing capacitor has a first terminal and a second terminal, and the primary and secondary coupling capacitor is one of the first terminal and the second terminal. The stabilizing capacitor is a toilet seat device connected to one of the first terminals and the other of the second terminals.

According to this toilet seat device, by connecting a stabilizing capacitor to the terminal on the opposite side of the pair of terminals of the smoothing capacitor to which the primary and secondary coupling capacitors are connected, the primary and secondary sides can be stabilized capacitors. Even when a loop is formed through the loop, noise from the primary side to the secondary side or from the secondary side to the primary side can be reduced because the smoothing capacitor is always used. Further, for example, when a lightning surge invades from the primary side, the surge wraps around through the stabilizing capacitor, which may cause a malfunction or damage the circuit. On the other hand, according to this toilet seat device, the invasion of surge can be suppressed by the smoothing capacitor.

According to the aspect of the present invention, there is provided a toilet seat device capable of suppressing malfunction of seating detection.

It is a perspective view which shows typically the toilet device provided with the toilet seat device which concerns on embodiment. It is sectional drawing which represents a part of the toilet seat which concerns on embodiment. It is a top view which shows typically the heating part which concerns on embodiment. It is a partial cross-sectional view schematically showing a part of a heating part which concerns on embodiment. It is a block diagram which shows typically the electric structure of the toilet seat device which concerns on embodiment. It is a block diagram which shows typically the modification of the electric structure of the toilet seat device which concerns on embodiment. It is a block diagram which shows typically the modification of the electric structure of the toilet seat device which concerns on embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In each drawing, similar components are designated by the same reference numerals and detailed description thereof will be omitted as appropriate.
FIG. 1 is a perspective view schematically showing a toilet device including the toilet seat device according to the embodiment.
As shown in FIG. 1, the toilet device 2 includes a Western-style sitting toilet (hereinafter simply referred to as a “toilet bowl” for convenience of explanation) 4 and a toilet seat device 10 provided on the toilet device 2. The toilet seat device 10 has a main body portion 12, a toilet seat 14, and a toilet lid 16.

In the description of the following embodiments, "upper", "lower", "front", "rear", "right side", and "left side" are used, but these directions are as shown in FIG. This is the direction seen from the user sitting on the toilet seat 14.

The toilet bowl 4 has a bowl portion 4a that is recessed downward. The toilet bowl 4 receives excrement such as urine and stool of the user in the bowl portion 4a. The main body 12 of the toilet seat device 10 is provided in the upper part behind the bowl portion 4a of the toilet bowl 4. The main body 12 pivotally supports the toilet seat 14 and the toilet lid 16 so as to be openable and closable.

The toilet seat 14 has an opening 14a. The toilet seat 14 is provided on the toilet bowl 4 so as to surround the outer edge of the bowl portion 4a, and exposes the bowl portion 4a through the opening 14a. As a result, the user can excrete in the bowl portion 4a while sitting on the toilet seat 14. In this example, a so-called O-shaped toilet seat 14 in which a through-hole-shaped opening 14a is formed is shown. The toilet seat 14 is not limited to the O-shape, but may be a U-shape or the like.

The toilet seat device 10 has a heating function of the toilet seat 14 for warming the seating surface of the toilet seat 14. In addition, the toilet seat device 10 has a hygienic cleaning function for cleaning local areas such as the "buttocks" of the user sitting on the toilet seat 14. The toilet seat device 10 is, in other words, a sanitary cleaning device. However, the toilet seat device 10 does not necessarily have to have a hygienic cleaning function. The toilet seat device 10 may have at least a heating function for the toilet seat 14. In other words, the toilet seat device 10 may be a heated toilet seat device.

The toilet seat device 10 has a nozzle 20 for cleaning a local part of the human body. The nozzle 20 is provided in the main body portion 12 and moves back and forth between a position where the nozzle 20 is housed in the main body portion 12 and a position where the nozzle 20 advances from the main body portion 12 into the bowl portion 4a. Note that FIG. 1 shows a state in which the nozzle 20 has advanced into the bowl portion 4a.

The main body 12 is configured to be able to communicate with an operation unit 6 such as a remote controller. The communication between the main body unit 12 and the operation unit 6 may be wired communication or wireless communication. The main body portion 12 advances the nozzle 20 into the bowl portion 4a in response to an input of an operation instruction from the operation unit 6, for example.

The nozzle 20 discharges water toward the local part of the human body to clean the local part of the human body. A bidet cleaning spout 20a and a buttocks cleaning spout 20b are provided at the tip of the nozzle 20. The nozzle 20 can inject water from the bidet washing spout 20a provided at the tip thereof to wash a female local part of a woman sitting on the toilet seat 14. Alternatively, the nozzle 20 can inject water from the buttocks washing spout 20b provided at the tip thereof to wash the "buttocks" of the user sitting on the toilet seat 14. The term "water" in the specification of the present application includes not only cold water but also heated hot water.

The mode for washing the "buttocks" includes, for example, "buttock washing" and "soft washing" in which the "buttocks washing" is gently washed with a softer stream of water than the "buttocks washing". The nozzle 20 can perform, for example, "bidet cleaning", "buttock cleaning", and "soft cleaning".

In the nozzle 20 shown in FIG. 1, the bidet cleaning spout 20a is provided on the tip side of the nozzle 20 with respect to the buttocks cleaning spout 20b, but the installation positions of the bidet cleaning spout 20a and the buttocks cleaning spout 20b are provided. Is not limited to this. The bidet cleaning spout 20a may be provided on the rear end side of the nozzle 20 with respect to the buttocks cleaning spout 20b. Further, although the nozzle 20 shown in FIG. 1 is provided with two spouts, three or more spouts may be provided.

FIG. 2 is a cross-sectional view schematically showing a part of the toilet seat according to the embodiment.
FIG. 2 schematically shows the cross section of the A1-A2 line of FIG.
As shown in FIG. 2, the toilet seat 14 has an internal space SP. In other words, the toilet seat 14 is hollow. The toilet seat 14 has, for example, an upper plate 30 and a lower plate 32, and by joining the upper plate 30 and the lower plate 32, an internal space SP is formed between the upper plate 30 and the lower plate 32. The upper plate 30 has a seating surface 30a on which the user is seated and an inner surface 30b facing the lower plate 32. In other words, the inner surface 30b is a surface facing the seating surface 30a in the internal space SP. The upper plate 30 and the lower plate 32 may be bonded by using an adhesive or by using vibration welding or the like. However, the configuration of the toilet seat 14 is not limited to the above, and may be any configuration having at least an internal space SP, a seating surface 30a, and an inner surface 30b.

The toilet seat 14 has a heating unit 34. The heating unit 34 warms the seating surface 30a of the upper plate 30. The heating unit 34 is provided on the inner surface 30b in the internal space SP, for example. The heating unit 34 is attached to, for example, the inner surface 30b. As a result, the heating unit 34 warms the seating surface 30a from the inside.

FIG. 3 is a plan view schematically showing the heating unit according to the embodiment.
FIG. 4 is a partial cross-sectional view schematically showing a part of the heating portion according to the embodiment.
As shown in FIGS. 3 and 4, the heating unit 34 includes a heat diffusion unit 41 and a heater 43. The heater 43 generates heat by passing an electric current. The heater 43 is, for example, a heating wire. The heater 43 is provided in the internal space SP, and by applying an AC voltage from the outside, the seating surface 30a is warmed from the inside via the inner surface 30b.

The heat diffusion portion 41 is provided on the inner surface 30b. The heat diffusion unit 41 is, for example, in the form of a sheet. In other words, the heat diffusion unit 41 is a heat diffusion sheet. The heater 43 has, for example, a cord shape. The area of the heat diffusion portion 41 is larger than the area of the heater 43. As a result, the heat diffusion unit 41 diffuses the heat of the heater 43 onto the inner surface 30b.

A first adhesive 44 is provided between the heat diffusion portion 41 and the heater 43. The first adhesive 44 joins the heat diffusion portion 41 and the heater 43.

A second adhesive 45 is provided between the heat diffusion portion 41 and the inner surface 30b of the upper plate 30. The second adhesive 45 joins the heat diffusion portion 41 and the inner surface 30b of the upper plate 30. As a result, the heat diffusion portion 41 is provided on the inner surface 30b of the upper plate 30.

The heat diffusion unit 41 is a conductor. The heat diffusion unit 41 is, for example, a metal foil. The thermal conductivity of the metal foil is higher than the thermal conductivity of the upper plate 30. Examples of the heat diffusion unit 41 include an aluminum foil and a copper foil.

As shown in FIG. 3, the heater 43 meanders in the heat diffusion unit 41 and is arranged over substantially the entire heat diffusion unit 41. Further, as shown in FIG. 2, the heating portion 34 is provided over substantially the entire inner surface 30b of the upper plate 30. In other words, the heat diffusion portion 41 is provided on substantially the entire inner surface 30b of the upper plate 30. The heater 43 meanders under the inner surface 30b of the upper plate 30 and is arranged over substantially the entire inner surface 30b. In this way, the cord-shaped heater 43 is provided on the inner surface 30b while being bent. The heater 43 is not limited to the cord shape, but may be a sheet shape or the like. The structure of the heater 43 may be any structure capable of warming the seating surface 30a from the inside.

FIG. 5 is a block diagram schematically showing the electrical configuration of the toilet seat device according to the embodiment.
As shown in FIG. 5, the toilet seat device 10 includes a power supply circuit 50, a control unit 52, a detection circuit 54, and a control load 56.

The power supply circuit 50 is electrically connected to the AC power supply PS. The power supply circuit 50 converts the AC voltage supplied from the AC power supply PS into a DC voltage, and supplies the converted DC voltage to the control unit 52, the detection circuit 54, and the control load 56. The power supply circuit 50 is a so-called AC-DC converter. The control unit 52, the detection circuit 54, and the control load 56 operate in response to the supply of DC voltage from the power supply circuit 50.

The control unit 52 comprehensively controls the operation of each unit of the toilet seat device 10. The control unit 52 is electrically connected to the detection circuit 54 and the control load 56, and controls the operation of the detection circuit 54 and the control load 56.

The toilet seat device 10 has, for example, a plurality of control loads 56. The control load 56 is, for example, a motor for moving the nozzle 20 forward and backward, an electromagnetic valve for switching between supplying water to the nozzle 20 (water discharge from the nozzle 20) and stopping the supply of water to the nozzle 20. is there. The control load 56 sucks, for example, a heat exchanger that heats the water supplied to the nozzle 20, a switching valve that switches the paths of the bidet washing spout 20a and the buttocks washing spout 20b, and the air in the bowl portion 4a. It may further include a deodorizing device for deodorizing. The control load 56 may be any device that operates by the DC voltage supplied from the power supply circuit 50 and whose operation is controlled by the control unit 52.

The control unit 52 is communicably connected to the operation unit 6 via, for example, a communication circuit (not shown). Various operation instructions according to the operation of the operation unit 6, such as execution of local cleaning by the nozzle 20 and stop of local cleaning, are input to the control unit 52. The control unit 52 controls the operation of the control load 56 in response to an operation instruction input from the operation unit 6. As a result, the control unit 52 controls the execution of local cleaning by the nozzle 20 and the stop of local cleaning according to the operation of the operation unit 6.

The detection circuit 54 detects that the user or the like is seated on the toilet seat 14. The detection circuit 54 detects the seating on the toilet seat 14 based on the control of the control unit 52, and inputs the detection result to the control unit 52. The control unit 52 controls the detection of seating by the detection circuit 54, and determines whether or not a person is seated on the toilet seat 14 based on the detection result of the detection circuit 54. The control unit 52 controls the operation of the plurality of control loads 56 based on the operation instruction input from the operation unit 6 and the detection result of the detection circuit 54.

When the detection circuit 54 detects seating on the toilet seat 14, the control unit 52 operates a predetermined control load 56 in response to an operation instruction from the operation unit 6. On the other hand, when the detection circuit 54 does not detect the seating on the toilet seat 14, the control unit 52 does not operate the predetermined control load 56 even if the operation instruction is input from the operation unit 6. For example, when the seating is not detected, the control unit 52 prevents the nozzle 20 from performing local cleaning. As a result, it is possible to prevent water from being discharged from the nozzle 20 when the user or the like is not seated on the toilet seat 14.

Further, for example, when the deodorizing device is a control load 56, the control unit 52 operates the control load 56 in response to the detection of seating on the toilet seat 14 by the detection circuit 54. In this way, the control unit 52 changes the operation state of the control load 56 based on the detection result of the detection circuit 54 according to the type of the control load 56. The control unit 52 operates the control load 56 or prohibits the operation of the control load 56 according to the detection result of the detection circuit 54.

The detection circuit 54 is electrically connected to the heat diffusion unit 41 of the heating unit 34 provided in the internal space SP of the toilet seat 14. The detection circuit 54 uses the heat diffusion unit 41 of the heating unit 34 as a detection electrode, and changes in the capacitance of the heat diffusion unit 41 between the state of being seated on the toilet seat 14 and the state of not being seated on the toilet seat 14. Detects sitting on the toilet seat 14.

The power supply circuit 50 is electrically connected to, for example, the power supply terminal 58. The power supply circuit 50 is electrically connected to the AC power supply PS via the power supply terminal 58. The AC power supply PS is, for example, a commercial power supply of AC100V (effective value). The power supply terminal 58 is, for example, an outlet plug.

The power supply circuit 50 includes, for example, a rectifier circuit 60, a smoothing capacitor 62, and a conversion circuit 64. The rectifier circuit 60 rectifies the AC voltage supplied from the AC power supply PS and converts it into a pulsating rectified voltage. The rectifier circuit 60 is, for example, a full-wave rectifier using a diode bridge, and converts an AC voltage into a full-wave rectified rectifier voltage. The rectifier circuit 60 may be, for example, a half-wave rectifier.

The rectifier circuit 60 is, for example, a full bridge circuit having four arms 600 (600a to 600d). Each arm 600 has one or more rectifier diodes 610. The rectifier circuit 60 further includes a stabilizing capacitor 620. The stabilizing capacitor 620 is connected in parallel to the rectifying diode 610 and is a capacitor for stabilizing the capacitance of the heat diffusion unit 41. The stabilizing capacitor 620 is provided, for example, only in one of the four arms 600. In this example, the stabilizing capacitor 620 is provided only on the arm 600a.

The smoothing capacitor 62 smoothes the rectified voltage rectified by the rectifier circuit 60 and converts the rectified voltage into a DC voltage. The smoothing capacitor 62 has a first terminal 62a and a second terminal 62b. For example, the first terminal 62a is a terminal on the high potential side, and the second terminal 62b is a terminal on the low potential side.

The conversion circuit 64 converts the DC voltage converted by the smoothing capacitor 62 into a DC voltage corresponding to the control unit 52, the detection circuit 54, and the control load 56. The conversion circuit 64 is a so-called DC-DC converter. The conversion circuit 64 converts, for example, a DC voltage of 100V into a DC voltage of about 5V to 24V. The conversion circuit 64 is, in other words, a buck converter. The conversion circuit 64 supplies the converted DC voltage to each part of the toilet seat device 10 such as the control unit 52, the detection circuit 54, and the control load 56. As a result, each of the control unit 52, the detection circuit 54, and the control load 56 can operate according to the supply of the DC voltage from the conversion circuit 64 (power supply circuit 50).

The conversion circuit 64 has a transformer 66 that electrically insulates the primary side (AC power supply PS side) and the secondary side (load side). The conversion circuit 64 is an isolated converter. The conversion circuit 64 is, for example, a flyback converter. As a result, for example, it is possible to prevent an operator who works on the control load 56 from receiving an electric shock with a relatively high primary power.

The conversion circuit 64 further includes a primary secondary coupling capacitor 71 that couples the primary side and the secondary side. The primary and secondary coupling capacitor 71 is connected to one of the first terminal 62a and the second terminal 62b of the smoothing capacitor 62. In this example, the primary / secondary coupling capacitor 71 is connected to the second terminal 62b. Further, the primary / secondary coupling capacitor 71 is connected to the low potential side on the secondary side. That is, in this example, one end of the primary secondary coupling capacitor 71 is connected to the second terminal 62b of the smoothing capacitor 62, and the other end of the primary secondary coupling capacitor 71 is connected to the low potential side of the secondary side. Has been done.

The stabilizing capacitor 620 is connected to, for example, the other of the first terminal 62a and the second terminal 62b of the smoothing capacitor 62. That is, the stabilizing capacitor 620 is connected to, for example, the side of the first terminal 62a and the second terminal 62b to which the primary secondary coupling capacitor 71 is not connected. In this example, the stabilizing capacitor 620 is connected to the first terminal 62a. More specifically, in this example, the stabilizing capacitor 620 is connected in parallel to the rectifier diode 610 of the arm 600a connected to the first terminal 62a.

The capacitance of the stabilizing capacitor 620 is, for example, larger than the parasitic capacitance of the rectifier diode 610 and equal to or less than the capacitance of the primary / secondary coupling capacitor 71. The capacitance of the stabilizing capacitor 620 is, for example, 1000 pF or more and 4700 pF or less, preferably about 2000 pF.

The power supply circuit 50 further includes, for example, capacitors 68 and 70 for suppressing common mode noise. The capacitors 68 and 70 are provided between the power supply terminal 58 and the rectifier circuit 60. One end of the capacitor 68 is electrically connected to one input terminal of the rectifier circuit 60. The other end of the capacitor 68 is set to the common potential GND. One end of the capacitor 70 is electrically connected to the other input terminal of the rectifier circuit 60. The other end of the capacitor 70 is set to the common potential GND. The common potential GND is, for example, the potential of the earth (so-called earth). The common potential GND may be, for example, the potential of the conductive frame or chassis of the toilet seat device 10 (so-called frame ground or chassis ground).

The heater 43 of the heating unit 34 is connected to the power supply terminal 58 (rectifier circuit 60). As a result, the AC voltage supplied from the AC power supply PS is applied to the heater 43. Further, a switching element 72 for switching between applying the AC voltage to the heater 43 and stopping the application is provided between the heater 43 and the power supply terminal 58. The switching element 72 is connected to the control unit 52. The control unit 52 controls on / off switching of the switching element 72. In other words, the control unit 52 controls the energization of the heater 43 (application of AC voltage and stop of application). The switching element 72 is, for example, a bidirectional optical thyristor. As a result, the control unit 52 connected to the secondary side of the power supply circuit 50 can be appropriately electrically insulated from the AC power on the primary side.

The control unit 52 controls the energization of the heater 43 so that, for example, the temperature of the seating surface 30a of the toilet seat 14 becomes a predetermined set temperature set by the operation of the operation unit 6. Further, for example, when the seating is not detected by the detection circuit 54, the control unit 52 lowers the temperature of the seating surface 30a of the toilet seat 14 to be lower than the set temperature. Then, when seating is detected by the detection circuit 54, the control unit 52 raises the temperature of the seating surface 30a of the toilet seat 14 to a set temperature. As a result, unnecessary power consumption can be suppressed when not in use, and power consumption of the toilet seat device 10 can be suppressed.

FIG. 6 is a block diagram schematically showing a modified example of the electrical configuration of the toilet seat device according to the embodiment.
As shown in FIG. 6, in this example, the primary secondary coupling capacitor 71 is connected to the first terminal 62a of the smoothing capacitor 62 on the primary side and the low potential side on the secondary side. That is, in this example, one end of the primary secondary coupling capacitor 71 is connected to the first terminal 62a of the smoothing capacitor 62, and the other end of the primary secondary coupling capacitor 71 is connected to the low potential side of the secondary side. Has been done.

In this example, the stabilizing capacitor 620 is connected to the second terminal 62b, which is the terminal on the side of the pair of terminals of the smoothing capacitor 62 where the primary secondary coupling capacitor 71 is not coupled. More specifically, in this example, the stabilizing capacitor 620 is connected in parallel to the rectifier diode 610 of the arm 600d connected to the second terminal 62b. In this way, the position where the stabilizing capacitor 620 is provided may be changed according to the connection destination of the primary / secondary coupling capacitor 71.

FIG. 7 is a block diagram schematically showing a modified example of the electrical configuration of the toilet seat device according to the embodiment.
As shown in FIG. 7, in this example, as in the example shown in FIG. 5, the primary secondary coupling capacitor 71 is located on the second terminal 62b of the smoothing capacitor 62 on the primary side and on the low potential side on the secondary side. It is connected. That is, in this example, one end of the primary secondary coupling capacitor 71 is connected to the second terminal 62b of the smoothing capacitor 62, and the other end of the primary secondary coupling capacitor 71 is connected to the low potential side of the secondary side. Has been done.

In this example, the stabilizing capacitor 620 is connected to the second terminal 62b. More specifically, in this example, the stabilizing capacitor 620 is connected in parallel to the rectifier diode 610 of the arm 600d connected to the second terminal 62b. As described above, the stabilizing capacitor 620 may be connected to the side of the smoothing capacitor 62, the first terminal 62a and the second terminal 62b, to which the primary secondary coupling capacitor 71 is connected.

As described above, in the toilet seat device 10 according to the present embodiment, by providing the stabilizing capacitor 620 in parallel with the rectifier diode 610 in the rectifier circuit 60, the stabilizing capacitor is provided even during the OFF period of the rectifier diode 610. The rectifier circuit 60 is capacitively coupled. Therefore, it is possible to suppress the change in electrostatic coupling due to the fluctuation of ON-OFF of the rectifier diode 610. As a result, the ground potential on the secondary side can be stabilized, and it is possible to suppress the malfunction of the seating detection.

Further, in the toilet seat device 10, the cost can be reduced and the size can be reduced by providing the stabilizing capacitor 620 only on one of the four arms 600 (600a to 600d) of the rectifier circuit 60.

Further, in the toilet seat device 10, the primary side and the secondary side are stabilized by connecting the stabilizing capacitor 620 to the terminal opposite to the terminal to which the primary secondary coupling capacitor 71 is connected among the pair of terminals of the smoothing capacitor 62. Even when the loop is formed via the capacitor 620, the noise from the primary side to the secondary side or from the secondary side to the primary side can be reduced because the smoothing capacitor 62 is always used. Further, for example, when a lightning surge enters from the primary side, the surge wraps around through the stabilizing capacitor 620, which may cause a malfunction or damage to the circuit. On the other hand, according to the toilet seat device 10, the smoothing capacitor 62 can also suppress the intrusion of surge.

The embodiments of the present invention have been described above. However, the present invention is not limited to these descriptions. With respect to the above-described embodiment, those skilled in the art with appropriate design changes are also included in the scope of the present invention as long as they have the features of the present invention. For example, the shape, size, material, arrangement, etc. of each element included in the toilet device 2 and the toilet seat device 10 are not limited to those illustrated, and can be changed as appropriate.
In addition, the elements included in each of the above-described embodiments can be combined as much as technically possible, and the combination thereof is also included in the scope of the present invention as long as the features of the present invention are included.

2 Toilet device, 4 Toilet bowl, 6 Operation unit, 10 Toilet seat device, 12 Main body, 14 Toilet seat, 16 Toilet lid, 20 Nozzle, 30 Upper plate, 32 Lower plate, 34 Heating part, 41 Heat diffusion part, 43 Heater, 44 1st adhesive, 45 2nd adhesive, 50 power supply circuit, 52 control unit, 54 detection circuit, 56 control load, 58 power supply terminal, 60 rectifier circuit, 62 smoothing capacitor, 64 conversion circuit, 66 transformer, 68 capacitor, 70 Capacitor, 71 primary secondary coupling capacitor, 72 switching element, 600, 600a to 600d arm, 610 rectifying diode, 620 stabilizing capacitor

Claims (3)

A toilet seat that has an internal space and has a seating surface and an inner surface that faces the opposite side of the seating surface in the internal space.
A heater provided in the internal space that warms the seating surface from the inside through the inner surface by applying an AC voltage from the outside.
A conductive heat diffusing portion provided on the inner surface, having an area larger than that of the heater, and diffusing the heat of the heater to the inner surface.
A detection circuit that is electrically connected to the heat diffusion unit and detects seating on the toilet seat by changing the capacitance of the heat diffusion unit.
A power supply circuit that is electrically connected to an AC power supply and supplies power to the detection circuit,
With
The power supply circuit is converted by a rectifying circuit that rectifies an AC voltage supplied from the AC power supply, a smoothing capacitor that smoothes the rectified voltage rectified by the rectifying circuit and converts it into a DC voltage, and the smoothing capacitor. It has a conversion circuit that converts the DC voltage into a DC voltage corresponding to the detection circuit.
The conversion circuit includes a transformer that electrically insulates the primary side and the secondary side, and a primary secondary coupling capacitor that couples the primary side and the secondary side.
The rectifier circuit is a toilet seat device including a rectifier diode and a stabilizing capacitor connected in parallel to the rectifier diode to stabilize the capacitance of the heat diffusion unit. The rectifier circuit is a full bridge circuit having four arms.
The toilet seat device according to claim 1, wherein the stabilizing capacitor is provided only on one of the four arms. The smoothing capacitor has a first terminal and a second terminal.
The primary / secondary coupling capacitor is connected to one of the first terminal and the second terminal.
The toilet seat device according to claim 2, wherein the stabilizing capacitor is connected to the other of the first terminal and the second terminal.

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