JP5176785B2 - Toilet seat device - Google Patents

Description

  The present invention relates to a toilet seat device.

  In the field of sanitary washing devices for washing the local part of the human body, in order to avoid discomfort to the human body, for example, a heating device for adjusting washing water used for washing to an appropriate temperature or a contact portion with the human body. Devices having various functions such as a toilet seat device for adjusting the temperature to an appropriate temperature have been devised. Above all, for the heating of the seating part of the toilet seat, in the case of the immediate heating type heating toilet seat different from the conventional heat insulation heating, the output of the heating element is 1 KW or more, which is much higher than before, It has been studied to detect an abnormality in toilet seat temperature by a method different from the temperature control method used so far (see, for example, Patent Document 1).

In such a configuration, it has a plurality of temperature sensors for measuring the temperature of the seating portion of the toilet seat, detects the temperature of a plurality of parts of the toilet seat, detects variations above a predetermined temperature, and supplies power to the heater that heats the toilet seat Was supposed to stop immediately.
JP 2007-75599 A

  By the way, in the conventional sanitary washing apparatus as described above, an abnormality is detected by measuring the temperature of the seating portion of the toilet seat, and power supply to the toilet seat heater is stopped. This is a toilet seat with a large heat sink, a small heat capacity, and a high heating rate, so that the configuration for detecting the state of overheating as quickly as possible and performing reliable power supply stop control is further improved. There was room.

An object of the present invention, when overtemperature of the seating section temperature heating toilet seat Sokunetsuta type, surely stopped fast and safe, is to increase the usability of the sanitary washing device.

In order to solve the above conventional problems, the toilet seat apparatus according, a toilet seat having a seating surface, and the heat generating portion that is provided on the back side of the seating surface of the toilet seat, a heater driving unit for driving the heat generating portion, A heater drive detection unit that detects a drive state of the heater drive unit, an AC voltage detection unit that detects an AC voltage, an output of the heater drive detection unit, and an output of the AC voltage detection unit, an abnormality of the heater drive unit And a control unit that detects disconnection of the heat generating unit, and the control unit shuts off both poles of the AC power supplied to the heat generating unit when detecting an abnormality of the heater driving unit or at least one disconnection of the heat generating unit. And a section.

Thereby, the abnormality of the heater drive unit and the disconnection of the heat generation unit are detected from the output of the heater drive detection unit and the output of the AC voltage detection unit, and both poles of the AC power supply supplied to the heat generation unit are cut off. Yes, it is possible to reliably stop the energization of the heating element by blocking both poles, and to detect an abnormality without measuring the toilet seat temperature and suppress an overtemperature. That is, when the temperature of the heat generating unit rises abnormally, both poles of the alternating current supplied to the heat generating unit are cut off, and the power supply to the heat generating unit is quickly stopped, so that an excessive rise in the toilet seat temperature is suppressed. Even if the insulation is broken, the toilet seat can be kept safe .

The toilet seat device of the present invention can quickly and surely stop energization of the toilet seat heater when an abnormal rise in the toilet seat temperature occurs, thereby realizing a safe and easy-to-use toilet seat device.

Toilet seat apparatus according to the first invention comprises a toilet seat having a seating surface, and the heat generating portion that is provided on the back side of the seating surface of the toilet seat, a heater driving unit for driving the heat generating portion, of the heater driving unit From the heater drive detection unit that detects the drive state, the AC voltage detection unit that detects the AC voltage, the output of the heater drive detection unit, and the output of the AC voltage detection unit, the abnormality of the heater drive unit and the heat generation unit The controller includes a controller that detects disconnection, and the controller includes an interrupter that shuts off both poles of the AC power supplied to the heat generator when detecting an abnormality of the heater driving unit or a disconnection of the heat generator. It is characterized by that.

Thereby, the abnormality of the heater drive unit and the disconnection of the heat generation unit are detected from the output of the heater drive detection unit and the output of the AC voltage detection unit, and both poles of the AC power supply supplied to the heat generation unit are cut off. Yes, it is possible to reliably stop the energization of the heating element by blocking both poles, and to detect an abnormality without measuring the toilet seat temperature and suppress an overtemperature. That is, when the temperature of the heat generating unit rises abnormally, both poles of the alternating current supplied to the heat generating unit are cut off, and the power supply to the heat generating unit is quickly stopped, so that an excessive rise in the toilet seat temperature is suppressed. Even if the insulation is broken, the circuit to the power supply section to the heater is cut off, so that the toilet seat can be kept in a safe state.

The second aspect of the present invention further includes a temperature measurement unit and an excessive rise detection unit that detects an excessive increase in the toilet seat temperature from the output of the temperature measurement unit. When it is detected that the temperature rises excessively, both the poles of the AC power supplied to the heat generating part are cut off by the cut-off part.

  Thereby, the output of the temperature measuring unit is received, and the toilet seat temperature is prevented from being excessively raised by the interruption of the AC power supply to the heating element. At this time, since the power supply is cut off without using the control unit, it is ensured that the heating element is energized even when the heater drive unit fails or the control unit malfunctions due to noise or when it fails. It can be stopped.

The third invention further includes a dielectric breakdown detection unit for detecting a dielectric breakdown of the heat generating part, and when the insulation breakdown detection part detects a dielectric failure or a dielectric breakdown, the signal is received to supply the blocking part to the heat generating part. This is to cut off both poles of the AC power supply.

  Thereby, the insulation breakdown of the heat generating portion is detected, and the toilet seat temperature is prevented from rising due to the interruption of the AC power supply to the heating element by the blocking portion. At this time, since the configuration is such that the energization is cut off without using the control unit, disconnection of the heat generating unit occurs, for example, a large heat capacity heater for rapid temperature rise is provided in the heat generating unit, and the toilet seat has a small heat capacity and a low thermal conductivity. When a good metal toilet seat is used, when the heater is disconnected, local heat is generated, causing dielectric breakdown, and there is a possibility that the cross section contacts the metal toilet seat. In such a case, even when the control unit abnormally operates due to noise or when it fails, it is possible to reliably cut off the power supply to the heat generating unit without going through the control unit.

Furthermore, a fourth aspect of the invention includes a leakage detection unit that operates when the toilet seat device has a leakage, and the blocking unit blocks both poles of the AC power supplied to the heating unit when the leakage detection unit detects a leakage. It is.

Thus, by using the same breaker as the leakage breaker circuit that operates when the toilet seat device leaks, a toilet seat device to which a leakage breaker function is added can be realized without a separate leakage breaker circuit. The fifth aspect of the invention further includes a display unit that displays an abnormality, and performs display based on the abnormality determined by the control unit.

  Thereby, it is possible to notify the user of what kind of abnormality the toilet seat is in parallel with the operation of shutting off the power from the shut-off unit.

(A) Configuration of Toilet Seat Device FIG. 1 is a schematic diagram showing the configuration of the toilet seat device 100. The toilet seat device 100 includes a main body 200 and a toilet seat 400.

  As shown in FIG. 1, the main body 200 drives a control unit 90 made of, for example, a microcomputer, a temperature measurement unit 401 that measures the temperature of the toilet seat, an excessive elevation detection unit 405 that detects excessive elevation of the toilet seat, and a toilet seat heater. A heater drive unit 402 having a triac, a heater drive detection unit 407 that detects a state of the heater drive unit and outputs a signal to the control unit 90 according to the detected state, a dielectric breakdown detection unit 403 that detects dielectric breakdown of the toilet seat, A shut-off circuit 406 that is a shut-off unit that shuts off the power supply to the toilet seat heater from both poles, a display unit 514 that performs settings and a control unit 90 to determine and notify the user according to an abnormal state, Insulation type DC power supply unit 408 that generates a DC voltage from an AC power supply for the operation unit 515 that operates when the setting is changed, a circuit such as a control unit, and the leakage of the toilet seat device are detected. Phase current transformer (ZCT) 409, leakage current is detected according to the output of ZCT, leakage detection unit 510 for disconnecting the both-cut contact, double-cut contact 511 consisting of a relay, etc., AC voltage arranged on the toilet seat heater side of the double-cut contact AC voltage detection circuit A512 to detect, AC voltage detection circuit B513 arrange | positioned at the commercial power supply 404 side of the both-ends contact 511 is included.

  The toilet seat 400 includes a toilet seat heater 450 and a thermistor 401a. The temperature measurement unit 401 converts the toilet seat temperature into a voltage based on the temperature signal output from the thermistor 401 a and inputs the voltage to the control unit 90.

The control unit 90 inputs an energization rate switching signal to the heater drive unit 402 or displays the toilet seat set temperature and the like on the display unit 514 in accordance with the preset toilet seat temperature set and stored and the input from the operation unit 515. Or The heater drive unit 402 controls the current supplied from the commercial power supply 404 in accordance with the energization rate switching signal to control the energization to the toilet seat heater 450. FIG. 2 is a partial exploded perspective view of the toilet seat 400 .

  As shown in FIG. 2, the toilet seat 400 has a structure in which a substantially horseshoe-shaped toilet seat heater 450 is attached to the inner surface side of a substantially elliptical upper toilet seat casing 410 formed mainly of aluminum, and a thermistor 401a is further attached. And a substantially elliptical lower toilet seat casing 420 formed of synthetic resin.

  3 is a view of the toilet seat heater 450 attached to the toilet seat casing 410 and viewed from the inside. FIG. 4A is a cross-sectional view taken along line AA ′ of FIG. 3, and FIG. FIG. 5 and FIG. 5 are sectional views taken along the line BB ′ of FIG.

  Hereinafter, the front side viewed from the seated user is defined as the front portion of the toilet seat 400, and the rear side viewed from the seated user is defined as the rear of the toilet seat 400.

  As shown in FIGS. 2 and 3, the toilet seat heater 450 is formed in a substantially horseshoe shape in which a part of the front portion is cut off. The toilet seat heater 450 may have a substantially oval shape. The toilet seat heater 450 has a configuration in which a linear heater 460 is sandwiched between metal foils 451 and 453 made of, for example, aluminum.

  The linear heater 460 is disposed in a meandering shape in accordance with the shape of the upper toilet seat casing 410. The interval between the linear heaters 460 is about 5 mm.

  The heater start end portion 460 a and the heater end portion 460 b of the linear heater 460 are respectively connected to lead wires 470 drawn from one side of the rear portion of the toilet seat 400.

  Furthermore, as shown in FIG. 3, a plurality of bent portions serving as thermal stress buffering portions are provided in the path of the meandering linear heater 460.

  Furthermore, as shown in FIG. 4, the upper toilet seat casing 410 is formed of, for example, an aluminum plate 413 having a thickness of 1 mm. A surface decorative layer 411 is formed on the upper surface of the aluminum plate 413. A coating film 414 is formed on the lower surface of the aluminum plate 413. The coating film 414 is, for example, a polyester powder coating film having a film thickness of 40 μm and heat resistance of 150 ° C., and can sufficiently secure an electrical withstand voltage performance of 1 minute or more at 1000 V, which is an electrical equipment technical standard.

  Instead of the aluminum plate 413, one or more of a copper plate, a stainless steel plate, an aluminum plated steel plate, and a zinc aluminum plated steel plate may be used.

  A metal foil 451 made of, for example, aluminum is attached to the lower surface of the coating film 414 via an adhesive layer 452a. The film thickness of the metal foil 451 is, for example, 50 μm. The metal foil 451 is composed of a PET layer 495a 25 μm and an aluminum foil layer 451a 25 μm, and has a structure in which strength is increased by the PET layer 451a.

  The linear heater 460 includes a heating wire 463a having a circular cross section, an enamel layer 463b, and an insulating coating layer 462. The outer peripheral surface of the heating wire 463a having a circular cross section is sequentially covered with the enamel layer 463b and the insulating coating layer 462. The enamel wire 463 is constituted by the heating wire 463a and the enamel layer 463b.

  The heating wire 463a has a diameter of 0.16 to 0.25 mm, for example, and is made of copper or a copper alloy. In this example, as the heating wire 463a, a high tensile strength linear heater made of a 4% Ag—Cu alloy having a diameter of 0.176 mm is used. The resistance value is 0.833 Ω / m.

  The enamel layer 463b is made of, for example, polyesterimide (PEI) having heat resistance of 180 to 300 ° C. The film thickness of the enamel layer 463b is 20 μm or less, and is 12 to 13 μm in this example. Alternatively, polyimide (PI) or polyamideimide (PAI) may be used as the material for the enamel layer 463b.

  The insulating coating layer 462 is made of a fluororesin such as a perfluoroalkoxy mixture (hereinafter referred to as PFA) having heat resistance of 260 ° C., for example. The thickness of the insulating coating layer 462 is, for example, 0.1 to 0.15 mm. The insulating coating layer 462 made of PFA can be formed by extrusion. Note that polyimide (PI) or polyamideimide (PAI) may be used as the material of the insulating coating layer 462.

  The outer diameter of the linear heater 460 is, for example, 0.46 to 0.50 mm. The power density of the linear heater 460 is, for example, 0.95 W / cm 2.

  The linear heater 460 is attached to the metal foil 451 so as to be covered with an adhesive layer 452b and a metal foil 453 made of, for example, aluminum. The film thickness of the metal foil 453 is, for example, 50 μm. The metal foil 453 includes a PET layer 495b of 25 μm and a 453a aluminum foil layer of 25 μm, and has a structure in which strength is increased by the PET layer 495b.

  In addition, by coating the entire circumference of the end surface to which the metal foil 453 and the metal foil 451 are attached with the coating material 490, the inner surface side of the toilet seat can cover the charging part with the PET layer 495b and the coating material, and the toilet seat has water inside. Even if a spills, the structure will not cause leakage.

  In FIG. 5, a connection terminal 477 is connected to the end of the dielectric breakdown detection lead 476 and is fixed between the metal foils 451 and 453. The connection terminal 477 is made of metal and is in contact with the aluminum layer 451 and is conductive.

(B) Configuration of heater drive detection unit and abnormality detection method (b) -1. Toilet Seat Heater Control Method FIG. 6 shows a detailed configuration of each block related to the control of the toilet seat device 100 of FIG. When the conduction signal is output, the heater driving unit 402 is configured by a triac that is an element that maintains conduction until the next zero cross point, and the AC voltage detection circuit A 512 outputs a signal synchronized with the zero cross of the AC voltage. When a control signal for the toilet seat heater 450 is output from the control unit 90, the linear heater 460 is switching-controlled via a triac, and an AC voltage is applied from the commercial power supply 404.

  FIG. 7 is a time chart showing the relationship between the triac control pulse of the heater drive unit 402 and the applied voltage waveform of the toilet seat heater 450 in the heating toilet seat control according to the embodiment of the present invention. The toilet seat heater 450 is energized by receiving a zero-cross signal and energizing the AC voltage for the entire period (1) full-wave control, and energizing the half-section (2) half-wave control. (3) Three control methods of phase control are performed. The shaded portion of the toilet seat heater applied voltage waveform during each control is a portion to which a voltage is applied in each control state. In (1) full-wave control and (2) half-wave control, when one gate pulse to the triac is output at the zero cross point of the AC voltage, a half-cycle voltage up to the next zero point is applied to the toilet seat heater 450 Is done. If no pulse is applied, no voltage is applied to the toilet seat heater 450. (3) In phase control, the gate pulse is output with a delay from the zero cross point, and a part of the AC voltage from the gate pulse output to the next zero point is applied. Here, if the pulse is output after the maximum value of the voltage, a low voltage is applied and the application time is shortened.

  (1) Full-wave control and (2) Half-wave control are control methods suitable for rapidly heating the toilet seat because the amount of power supplied to the toilet seat heater 450 is large. (3) Phase control is the application of voltage. Since the time is short, the control method is suitable for a state where a large amount of power is not required, that is, when the temperature of the toilet seat is in the vicinity of the target temperature and the toilet seat temperature is kept warm.

  By using these control methods, the toilet seat device of the present embodiment includes a human body detection sensor (not shown) that detects that the user has entered the room, and when the human body detection sensor detects that the user has entered the toilet seat, The amount of power supplied to the heater 450 is large (1) Full-wave control and (2) Half-wave control rapidly heats the toilet seat. Then, when heated to an appropriate temperature or when the user is seated, instead of rapid heating, (3) the temperature of the seating section is gently raised to the appropriate temperature by phase control, or kept at the appropriate temperature.

(B) -2. Heater Drive Detection Unit Configuration FIG. 8 shows an output signal of the heater drive detection unit 407 in each toilet seat heater control state. Similarly to FIG. 7, the hatched portion indicates voltage application to the toilet seat heater 450. The heater drive detection unit 407 is connected to both ends of the triac of the heater drive unit 402, converts the conduction state of the triac into a DC power supply signal, and outputs the signal to the control unit 90. The solid line in the figure is the output signal of the heater drive detection unit 407 in each control state of the toilet seat. The left side of FIG. 8 is a waveform when the triac and the toilet seat heater 450 are normal, the center is a waveform when the triac short-circuit failure and the toilet seat heater disconnection failure, and the right side is a waveform when the triac is open. Each stage indicates a control state of each toilet seat heater 450.

  As can be seen from the diagrams at each stage, abnormality detection is performed only when the waveform is clearly different from the normal state. Triac short-circuit failure and toilet seat heater disconnection failure detection are performed when the toilet seat heater 450 is not energized and during phase control. Triac open failure detection is performed during full-wave control. During half-wave control, abnormal output is not detected because the normal output differs depending on whether the applied voltage is positive or negative.

(B) -3. Triac Short-Circuit Fault and Toilet Seat Heater Disconnection Fault Detection Method FIG. 9A illustrates the details of the triac short-circuit fault and the toilet seat heater disconnection fault detection method. (B) shows the level detection timing at each frequency set in the present embodiment. The controller 90 inputs the output signal of the heater drive detector 407. As shown in FIG. 9A, the level of the output signal of the heater drive detector 407 is detected after elapse of T1, T2, and T3 times (set within the time of one half wave) from the zero cross signal, and T1, T2 When the level detection values at the time of each of T3 coincide with each other three times, the input final value of the level of the output signal for one half wave is set. The reason for performing level detection three times at different timings is to prevent erroneous determination when noise is periodically generated with respect to the AC voltage.

  Here, the number of times is three, but the number is not limited to this, and a plurality of times is desirable. By setting the values of T1, T2, and T3 to different values between 50 Hz and 60 Hz, in both cases, the transient state of the output signal of the heater drive detection unit 407 is avoided, and the level detection in a stable state is performed. It can be performed.

  Then, the level determination values for two half-waves are set as one set to be the determination values for all waves. Since the combination of HL or LH is continuous when the upper part is normal, it is determined that there is an abnormality if there is a combination of LL or HH within a certain sampling rate within a certain ratio. The determination is performed by a movement determination method in which the oldest determined value is discarded for each set. The determination cycle is every AC cycle.

  In this embodiment, it is determined that there is an abnormality in the case of 42 sets of 70% out of 60 sets. In the case of 60 Hz, it takes 0.7 seconds (42 cycles) from the occurrence of abnormality to the determination of abnormality. In this way, it is possible to determine an abnormality fast and robust against noise.

When the controller 90 determines that the triac short-circuit failure and the toilet seat heater disconnection failure are established, the controller 90 causes the display unit 514 to display a predetermined abnormality. Further, the control unit 90 activates the shut-off circuit 406 to shut off both poles of the AC power supplied to the toilet seat heater 450 .

When the TRIAC is short-circuited, energization to 5460 is not stopped and the temperature of the toilet seat rises excessively. Therefore, when used together with the excessive rise detection unit 405, the safety is further increased. Overheat sensing unit 405 energizes blocking stool seat heater 450 by the blocking circuit 406 without passing through the control unit 90. Therefore, even when one of the control unit 90 and the excessive rise detection unit 405 fails, the energization to the toilet seat heater 450 can be reliably stopped. Even if there is no failure, it can be stopped at the one where the abnormality is confirmed earlier. In addition, in order to prevent erroneous determination due to noise, it is possible to set the abnormality determination time in the control unit 90 to be sufficiently long, to perform only the abnormality display, and to stop the toilet seat heater 450 by the excessive rise detection unit 405.

Similarly, when the linear heater 460 of the toilet seat heater 450 is disconnected , local heat is generated, thereby causing a local abnormal temperature rise and breaking the insulation. Then, the cross section of the linear heater 460 may contact the metal part of the toilet seat and the insulation may be broken. For this reason, when used in combination with the dielectric breakdown detector 403, the safety is further increased. Since the insulation breakdown detection unit 403 interrupts the energization of the toilet seat heater 450 by the interruption circuit 406 without passing through the control unit, the control unit 90 and the insulation breakdown detection unit 4
Even when either one of 03 fails, the energization to the toilet seat heater 450 can be reliably stopped. Even if there is no failure, it can be stopped at the one where the abnormality is confirmed earlier. In addition, in order to prevent erroneous determination due to noise, it is possible to set the abnormality determination time in the control unit 90 to be sufficiently long, perform only abnormality display, and stop the toilet seat heater 450 in the dielectric breakdown detection unit 403.

(B) -4. Triac Open Failure Detection Method FIG. 10 shows details of the triac open failure detection method. The level detection method and level determination method of the output signal of the heater drive detection unit 407 are the same as the above-described triac short circuit failure and toilet seat heater disconnection failure detection methods.

  Since the level determination value for two half-waves is one set and the combination of LL is continuous at normal time, if there is a combination of HL or LH more than a certain ratio within a certain sampling time, it is determined as abnormal. The determination is performed by a movement determination method in which the oldest determined value is discarded for each set. The determination cycle is every AC cycle.

  In this embodiment, it is determined that there is an abnormality in the case of 42 sets of 70% out of 60 sets. In the case of 60 Hz, it takes 0.7 seconds (42 cycles) from the occurrence of abnormality to the determination of abnormality.

When the triac open failure is confirmed, the control unit 90 causes the display unit 514 to display a predetermined abnormality. In the case of a TRIAC opening failure, the toilet seat heater 450 is not energized when it should be energized, so the toilet seat does not warm, but there is no unsafety such as excessive rise of the toilet seat or dielectric breakdown. Therefore, the control unit 90 does not operate the cutoff circuit 406 and does not cut off both poles of the AC power supply. Only the specified abnormality is displayed. Accordingly, the user can sit on the toilet seat and use various functions other than toilet seat heating, such as human body washing, drying, and deodorizing.

(C) Configuration of each safety circuit (c) -1. Dielectric breakdown detection circuit As shown in FIG. 6, the dielectric breakdown detection unit 403 is connected from a commercial power supply 404 to both poles via a double-cut contact 511 and a zero-phase current transformer (ZCT) 409. It is connected to the anode side of a rectifying diode 492 of about 600 V, the cathode side of these diodes is connected via current limiting resistors 493a and 493b, and the connection point of the resistors is on the anode side of the LED of the Darlington type photocoupler 494 Connected. And this cathode side of the LED is connected to the breakdown detection lead wire 476 of the toilet seat 400. By being connected via two rectifying diodes, a current flows to the detection line 476 when the toilet seat insulation is broken from either side of the commercial power supply 404. This is to ensure that the detection current always flows from one of the AC poles regardless of the portion of the linear heater 460 where the insulation is broken.

If the insulation of the insulating layer 463a and 462 of the linear heater 460 of the toilet seat heater 450 is broken somewhere in the toilet seat heater 450 due to secular change, local heat generation, etc., the toilet seat heater and the detection line become conductive. The detection current flows and the photocoupler 494 is turned on. The output of the photocoupler 494 is input to the base of a PNP transistor provided with an emitter, the PNP transistor is turned on, and the collector output becomes a power supply voltage. Then, the NPN transistor 1 and the NPN transistor 1 constituting the latch circuit in the cutoff circuit 406 connected to the collector via a resistor are turned on, and the base voltage of the NPN transistor 1 is latched to the power supply voltage. Then, the NPN output stage transistor 1 of the cutoff circuit 406 is turned on, and a current flows from the constant voltage source to the NPN output stage transistor 1 via the ZCT. As a result, an imbalance occurs as in the case where a leakage occurs between the two wires passing through the ZCT, a voltage is generated at the output of the ZCT, and the leakage detection unit 510 blocks the double cut contact 511. Then, energization to the toilet seat heater 450 is stopped.

If the result is used while the dielectric breakdown, to break up the insulating layer of the insulating layer and the toilet seat surface of powder paint of the toilet seat, but the seat is likely to become the charging unit, the toilet seat heater 450 early before that Stop energizing the.

Furthermore, when the insulation of the paint film 414 inside the toilet seat, not the insulating layer of the linear heater 460, is broken due to aging or external force, the dielectric breakdown detection current is supplied from the commercial power supply 404 to the diode 492, the limiting resistance, as shown in FIG. 493a or limiting resistor 493b, photocoupler 494 LED, dielectric breakdown detection lead wire 476, metal foil 451, and toilet seat 410 flow to the ground via the ground wire when the toilet seat 410 is grounded and grounded If not, it will flow to the ground through a person in contact with the toilet seat surface or through a waterway. Also in this case, the relay circuit works by the output of the photocoupler 494, and it can be safely stopped without continuing the current flow. Even when the toilet seat surface can be a charged part, the current value can be restricted to a non-hazardous range of 0.5 mA or less by setting the limiting resistors 493a and 493b to 200 kΩ or more. In the figure, the limiting resistor is between the diode 492 and the photocoupler 494, but may be in the middle of the dielectric breakdown detection lead 476.

  Further, the output of the NPN output stage transistor 2 is input to the control unit 90, and the control unit displays on the display unit 514 that the cutoff circuit has been operated, so that the user can know the abnormality of the toilet seat device. In addition, the current limiting resistors 493a and 493b have a very small resistance value of the linear heater 460, so that the current flowing through the linear heater 460 directly flows to the LED of the photocoupler 464 at the time of dielectric breakdown, so that the photocoupler 494 is broken. Is a value of 10 kΩ or more. The same effect can be obtained by connecting a protective resistor of about 1 kΩ in parallel with the LED of the photocoupler 494. Further, since the limiting resistors 493a and 493b are provided between the two diodes 492, even when one of the diodes 492 is short-circuited, a large current does not flow in the dielectric breakdown detection unit 403. Here, in FIG. 6, the polarity of the LEDs of the two diodes 492 and the photocoupler 494 is the anode on the AC power supply side, but the AC power supply side may be connected to the cathode side so that current flows to the AC power supply side.

By setting the time constant of RC connected to the collector output of the PNP transistor to 3 seconds or more, a voltage exceeding the withstand voltage of the diode 492 is obtained in a test in which 1200 V is applied for 3 seconds under the conditions of the withstand voltage test of the electric toilet seat. When applied, an avalanche is generated in the diode 492, and a reverse current flows through the diode 492, so that a detection current flows even if the insulation between the toilet seat heater = detection lines is not broken, and even if the photocoupler 494 is turned on, 3 Since the interruption operation is not performed for a second, the dielectric breakdown detection unit 403 does not malfunction. Furthermore, if the time constant is extended to 1 minute or more, malfunction does not occur even in a dielectric strength test in which a voltage of 1000 V is applied for 1 minute. Further, by connecting a diode in parallel with the LED of the photocoupler, the reverse voltage applied to the LED can be reduced to Vf of the diode, and the LED of the photocoupler is not destroyed.

(C) -2. Over-rise detection circuit Next, the over-rise detection circuit will be described. The resistance value of the thermistor 401a attached to the inner surface of the toilet seat changes due to the change in the toilet seat temperature. The change of the resistance value is converted into a voltage signal by a temperature measuring unit 401 having a constant voltage source and a resistor. The converted signal voltage is input to the comparator of the excessive rise detection unit 405. A reference voltage corresponding to 47 ° C. is input to the other input of the comparator. When the signal voltage from the temperature measurement unit 401 falls below the reference voltage, a signal is output from the over-rise detection unit 405.

The signal output from the excessive rise detection unit 405 is input to the cutoff circuit 406. The cutoff circuit 406 constitutes a latch circuit in which two transistors are combined.
It latches that the output of 5 switched, and hold | maintains until the power supply of a toilet seat apparatus turns off.
Then, the NPN output stage transistor 1 of the cutoff circuit 406 is turned on, and a current flows from the constant voltage source to the NPN output stage transistor 1 via the ZCT. As a result, an imbalance occurs as in the case where a leakage occurs between the two wires passing through the ZCT, a voltage is generated at the output of the ZCT, and the leakage detection unit 510 blocks the double cut contact 511. Then, energization to the toilet seat heater 450 is stopped.

(C) -3. Next, the leakage detection circuit will be described. The ZCT 409 amplifies the difference between the alternating currents passing therethrough and outputs it as a voltage, and the leakage detection unit 510 turns off the double-contact 411 when the output of the ZCT exceeds the threshold value. Further, the operation unit 515 has a test switch for a leakage detection circuit. When the test switch is pressed, the control unit 90 outputs a voltage to the cutoff circuit 406. Further, when the control unit 90 detects an abnormality of the heater driving unit 402 and disconnection of the toilet seat heater 450 based on the outputs of the heater drive detection unit 407 and the AC voltage detection circuit A 512, a voltage is similarly output to the cutoff circuit 406.

  The shut-off circuit 406 constitutes a latch circuit combining two transistors, and latches that the output of the over-rise detection unit 405 has been switched even for a moment and holds it until the toilet seat device is turned off.

  Then, the NPN output stage transistor 1 of the cutoff circuit 406 is turned on, and a current flows from the constant voltage source to the NPN output stage transistor 1 via the ZCT. As a result, an imbalance occurs as in the case where a leakage occurs between the two wires passing through the ZCT, a voltage is generated at the output of the ZCT, and the leakage detection unit 510 blocks the double cut contact 511.

(C) -4. Display of Safety Circuit The control unit 90 displays on the display unit 514 what kind of abnormality has occurred to the user when the dielectric breakdown detection circuit, the overheating detection circuit, and the leakage detection circuit are operated. In order to determine which safety circuit has been operated by the control unit 90, an AC voltage detection circuit A512 having a bi-directional photocoupler, an insulated photocoupler, an LED connected in parallel with the LED, and a diode having a reverse polarity are connected. The output of the AC voltage detection circuit B 513 , the cutoff circuit 406, and the output of the temperature measurement unit 401 are input to the control unit.

  The outputs of the AC voltage detection circuit 1 (412) and the AC voltage detection circuit B 513 are shown in FIG. 11 (1) when the double-cut contact 511 is turned on, FIG. 11 (2) when the electric toilet seat is disconnected from the AC power source, and the double-cut contact 511 When it is off, it changes as shown in FIG.

Based on this change, the control unit determines that the double contact 511 is off and determines that the safety circuit has been operated. Next, which safety circuit is working is determined as follows. When the output of the cutoff circuit 406 is output, the output voltage of the dielectric breakdown detection unit 403 and the temperature measurement unit 401 is 47 ° C. or higher, and when the output of the cutoff circuit 406 is present, the over-rise detection circuit, the cutoff circuit 406 and When the output voltage of the temperature measuring unit 401 is 47 ° C. or lower, it is determined that the leakage detection circuit is present, and each abnormality is displayed. In addition, even if the leakage test fails and the leakage test output is output, if the leakage detection circuit is not operating, the failure indication of the leakage detection circuit is displayed and the operation of the toilet seat device can be stopped. Will not continue to be used with the safety device broken.

Further, in this configuration, the waveform obtained by connecting the outputs of the AC voltage detection circuit A 512 and the AC voltage detection circuit B 513 with a wired OR circuit is as shown in FIG. 12, and the commercial power supply is disconnected by one input of the microcomputer of the control unit 90. Whether the double-cut contact 511 is disconnected,
Whether it is normal can be determined. As a result, the fact that the double-cut contact 511 is disconnected is compared to the case where a separate contact on the normally open side is prepared separately from the normal contact side of the double-cut contact 511 and it is detected that the contact has switched to that contact. Since the number of contacts is small and abnormality is displayed on the control unit and the display unit that are insulated from the commercial power supply, it is safer.

  Further, since the output signal of the AC voltage detection circuit A 512 configured as shown in FIG. 13A has a waveform synchronized with the zero cross of the AC voltage, the control unit synchronizes with the zero cross and performs the triac with an arbitrary phase. By turning it on, the power of the toilet seat heater can be adjusted frequently.

In this embodiment, a bidirectional photocoupler is used for the AC voltage detection circuit A512. However, basic insulation is not required between the input-side LED and the output-side phototransistor of the photocoupler. A circuit configuration such as the AC voltage detection circuit A 512 of b) may be used. This is because the DC power source is an insulated power source, and if the double-cut contact 511 is disconnected, the basic insulation between the double-cut contact 511 and the DC power supply is secured between the toilet seat heater and the commercial power supply.

  In this embodiment, the AC voltage detection circuit B513 is provided. Even when the AC voltage detection circuit B513 is not provided, the control unit 90 outputs the output voltage after the DC voltage source is disconnected from the commercial power source. Count the predetermined time until the voltage drops so that it can no longer operate. If the output voltage does not drop, it can be seen that the commercial power supply is not disconnected. If the voltage drops, it is determined that the double-cut contact 511 is disconnected. You can also.

  INDUSTRIAL APPLICABILITY The present invention can be used for a sanitary washing device for washing a local part of a human body.

The schematic diagram which shows the structure of the toilet seat apparatus of embodiment at the time of this invention The schematic diagram which shows the exploded perspective view structure of the toilet seat of the toilet seat apparatus of embodiment at the time of this invention The figure which stuck the toilet seat heater on the toilet seat casing of the toilet seat apparatus of embodiment at the time of this invention, and was seen from the inner side (A) A sectional view taken along line A-A 'of FIG. 3 of the toilet seat device according to the embodiment of the present invention, and (b) an enlarged view of portion A of FIG. 4 (a). Sectional drawing in FIG. 3B-B 'of the toilet seat apparatus of embodiment at the time of this invention Detailed configuration diagram of toilet seat apparatus according to the embodiment of the present invention The figure explaining the time chart of the control pulse of the triac in the heating toilet seat control of the toilet seat apparatus of embodiment at the time of this invention, and a toilet seat heater applied voltage waveform The figure explaining the output signal of the heater drive detection part in the toilet seat heater each control state of the toilet seat apparatus of embodiment at the time of this invention (A) Detailed explanatory drawing of the triac short circuit fault and the toilet seat heater disconnection fault detection method in the toilet seat device of the embodiment at the time of the present invention, (b) A diagram explaining the level detection timing for each power supply frequency Detailed explanatory diagram of the triac opening failure detection method in the toilet seat device of the embodiment at the time of the present invention The figure which showed the output of AC voltage detection circuit 1 (412) and AC voltage detection circuit B513 of the toilet seat apparatus of embodiment at the time of this invention The waveform diagram which connected the output of AC voltage detection circuit A512 of the toilet seat apparatus of embodiment at the time of this invention, and AC voltage detection circuit B513 with the wired OR circuit The circuit block diagram of AC voltage detection circuit A512 of the toilet seat apparatus of embodiment at the time of this invention

DESCRIPTION OF SYMBOLS 100 Toilet seat apparatus 200 Main body part 400 Toilet seat part 90 Control part 401 Temperature measurement part 405 Over-rise detection part 402 Heater drive part 406 Cutoff circuit (cutoff part)
407 Heater drive detection unit 403 Dielectric breakdown detection unit 514 Display unit 515 Operation unit 408 DC power supply unit 409 Zero-phase current transformer (ZCT)
510 Leakage detection unit 511 Double cut contact 512 AC voltage detection circuit A
513 AC voltage detection circuit B
450 Toilet seat heater 401a Thermistor 404 Commercial power supply 460 Linear heater

Claims (5)

A toilet seat having a seating surface;
A heat generating part provided on the back side of the seating surface of the toilet seat;
A heater driving unit for driving the heat generating unit;
A heater drive detection unit that detects a drive state of the heater drive unit, an AC voltage detection unit that detects an AC voltage, an output of the heater drive detection unit, and an output of the AC voltage detection unit, an abnormality of the heater drive unit And a control unit that detects disconnection of the heat generating unit,
The toilet seat device according to claim 1, wherein the controller includes a shut-off unit that shuts off both poles of the AC power supplied to the heat generating unit when detecting at least one of an abnormality of the heater driving unit and a disconnection of the heat generating unit. A temperature measurement unit, and an excessive rise detection unit that detects an excessive increase in the toilet seat temperature from the output of the temperature measurement unit, and the blocking unit detects that the temperature of the toilet seat is excessively increased from the output of the temperature measurement unit. The toilet seat device according to claim 1 , wherein both the poles of the AC power supplied to the heat generating part are cut off by the shut-off part. Includes a breakdown detecting unit for detecting the breakdown of the heat generating portion, wherein when detecting a breakdown in insulation breakdown detecting unit, blocking part to claim 1 or 2 and to block the poles of the AC power supplied to the heating unit The toilet seat device described. Any one of Claims 1 to 3 provided with a leakage detecting unit that operates when the toilet seat device has a leakage, and the blocking unit cuts off both poles of the AC power supplied to the heat generating unit when the leakage detecting unit detects a leakage. The toilet seat device according to item. A display unit for displaying an abnormality, the display unit toilet seat apparatus according to claims 1 to perform a display based on abnormality determined by the control unit in any one of 4.