JP2939610B2 - Heating toilet seat controller - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heating toilet seat control device having improved safety when a sensor of a heating toilet seat installed in a toilet is out of order.

[0002]

2. Description of the Related Art In a conventional configuration of a heating toilet seat, a heater and a temperature detection sensor are generally provided in a portion of a toilet seat to be raised and lowered, and a control device is provided in a portion fixed to the toilet. Because of this separate configuration, the lead wire connecting the temperature detection sensor side and the control device side is wired through frequently bent parts, so when used for many years, the temperature detection sensor and the lead wire May be partially disconnected or disconnected.

[0003] Therefore, a circuit for maintaining safety corresponding to the semi-disconnection or disconnection state is required. Conventionally, when the temperature detection sensor or the lead wire is completely disconnected, a comparison circuit is provided and the temperature detection sensor is provided. A circuit that detects that the resistance value has become an abnormal value and turns off the heater is used.

[0004]

In the above-mentioned conventional circuit configuration, a temperature detection sensor or a half-break of a broken lead wire cannot be detected, and the circuit may be used in an unstable failure state for a long time. Therefore, there is a circuit as shown in FIG. 2 as a circuit for maintaining safety at the time of this half-break or break.

In FIG. 2, two comparison circuits are provided.
On the other hand, the comparison circuit IC1 compares the change in the resistance value of the temperature detection sensor RT with the temperature set by the variable resistor VR.
S is turned on and off, and the heater H is turned on and off to perform temperature control. The other comparison circuit IC2 detects a change in the resistance value of the temperature detection sensor RT and detects a predetermined abnormal change such as an open circuit. In such a case, a circuit for turning off the triac FLS and turning off the heater H with the transistor Q2 is provided, and even when a failure such as a half-break occurs, the instantaneous break is immediately detected by the comparison circuit IC2. ,
This is a heating toilet seat control device in which the heater is turned off and the system is locked.

However, in such a case, even if there is no disconnection, even if there is a slight power supply noise from the outside, an instantaneous disconnection signal is generated and a malfunction such as locking of the system occurs frequently.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and comprises a first comparison circuit for comparing a detected temperature of a temperature detection sensor with a set temperature and performing temperature control; In a heating toilet seat control device including two comparison circuits, that is, a second comparison circuit that performs disconnection detection by comparing and detecting an abnormal resistance value on the sensor side, a power supply reset circuit is provided next to the comparison circuit that performs disconnection detection. , Priority circuit and RS
A flip-flop circuit is provided, and the priority circuit gives priority to the power supply reset signal.

Further, the priority circuit and the RS flip-flop circuit are constituted by four NAND logic circuits.

[0009]

According to the configuration of the present invention, when a failure such as a partial disconnection or disconnection of a temperature detection sensor or a lead wire occurs, the second comparison circuit immediately detects an instantaneous disconnection, The system is securely locked to the heater OFF state via the priority circuit and the RS flip-flop circuit. In addition, even if the priority circuit receives external power noise and erroneously generates a disconnection signal, the power is reset by the power reset circuit. The signal is prioritized, the error signal is canceled, the power is reset, and the output is initialized to a normal state.

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a circuit diagram of a control device for a heated toilet seat showing one embodiment of the present invention.

In FIG. 1, a set temperature divided voltage by a variable resistor VR is inputted to an input second terminal of a first control circuit IC1, 1/2 for temperature control, and a temperature detection sensor RT is inputted to an input third terminal. Detected temperature partial pressure is input and output 1
The No. 1 terminal is input to the driving transistor Q1, the output of the driving transistor Q1 is input to the triac FLS, and the output of the triac FLS is connected to the heater H.

Power supply reset circuit 1 including transistor Q3
And NAND logic circuits IC2, 1/4 and IC
2, 2/4 constitute the priority circuit 2, and the NAND logical circuits IC2, 3/4 and IC2, 4/4 constitute the RS flip-flop circuit 3.

A second comparison circuit IC1, 2 /
2 is a priority circuit 2 in which a resistance partial pressure on the temperature detection sensor RT side is input to an input No. 6 terminal, a disconnection determination reference partial pressure is input to an input No. 5 terminal, and an output from an output No. 7 terminal is connected.
The output of the power reset circuit 1 is input to the terminals 12 and 13 of the IC2, 1/4, and the output of the 11th terminal of the IC2, 1/4 is
2, 2/4 second terminal and RS flip-flop circuit 3
Is input to the ninth terminal of IC2, 4/4. Further IC
The output No. 4 terminal of 2, 3/4 is input to the No. 8 terminal of IC2, 4/4, and the output No. 10 terminal of IC2, 4/4 is input to the transistor Q2.

Here, the operation of the circuit diagram of one embodiment will be described.

First, when the temperature of the heating toilet seat is higher than the set temperature set by the variable resistor VR during normal operation, the resistance value of the temperature detection sensor RT attached to the toilet seat portion decreases, and the temperature for the temperature control is reduced. 1 comparison circuit IC1,1 /
2, the voltage of the input terminal 3 becomes larger than the voltage of the input terminal 2, the output terminals 1 and 2 of the ICs 1 and 2 become H, and the drive transistor Q1 is turned off.
Is turned off and the heater H is turned off.

Next, when the temperature of the heating toilet seat falls below the set temperature, the resistance value of the temperature detection sensor RT increases,
The voltage of the third input terminal of the first comparison circuit IC1, 1/2 becomes smaller than the voltage of the second input terminal, the output of IC1, 1/2 becomes L, the drive transistor Q1 is turned on, and the transistor Q2 is turned on. If the triac FLS is O
N and the heater H are turned on.

Next, when the temperature detection sensor RT and the lead wires are disconnected or semi-disconnected when the heater H is normally energized, if the input No. 6 terminal of the second comparison circuits IC1, 2/2 for disconnection detection is used. The voltage becomes 0, which is lower than the voltage of the input No. 5 terminal which sets the disconnection determination criterion.
Is at H level.

On the other hand, during normal operation, the transistor Q3 of the power reset circuit 1 is off, so that the output signal from the power reset circuit 1 is L, and the input terminals of the ICs 2 and 1/4 constituting the priority circuit 2 L is input to 12,13. Therefore, the 11th output terminal of IC2, 1/4 is at H level.

Therefore, the second input terminal of the ICs 2 and 2/4 constituting the priority circuit 2 connected in series is H, and the seventh output terminal of the second comparison circuits IC1 and 2/2 is H
Therefore, the input terminal 1 of the ICs 2 and 2/4 connected in series is also H
Therefore, the output third terminal of IC2, 2/4 becomes L. ICs 2 and 4 constituting RS flip-flop circuit 3
Since the ninth input terminal of / 4 is H and the fifth input terminal of IC2, 3/4 is L, the tenth output terminal of IC2, 4/4, which is the output of the RS flip-flop circuit 3, becomes L,
The transistor Q2 is turned off and the triac FLS is turned off.
FF is performed to lock the system of the heater H to a safe OFF state.

When power supply noise is input during normal operation, the power supply reset circuit 1 operates at that moment and Q3 becomes O
N, the inputs 12, 1 of the ICs 2, 1/4 of the priority circuit 2
3 becomes H, the output terminal 11 of IC2, 1/4 becomes L, and the input terminal 2 of IC2, 2/4 also becomes L. Accordingly, the output terminal No. 3 of the ICs 2 and 2/4 is connected to the input terminal No. 1 regardless of the level of the other input terminal. H.

As a result, the RS flip-flop circuit 3 (IC2, 3/4, IC2, 4/4) is reset to the initial value. As a result, the tenth terminal of the output IC2, 4/4 of the RS flip-flop circuit 3 is inverted to H, and the transistor Q2 is turned on. Therefore, only by the normal temperature control signal, the driving transistor Q1 and the triac FL
S is controlled, and the heater H is controlled normally.

As described above, even when the power supply noise is simultaneously output as the disconnection signal and output from the second comparison circuits IC1, 2/2, the priority circuit 2 operates to determine whether or not there is a disconnection side output. Irrespective of this, the temperature control circuit by the first comparison circuits IC1 and 1/2 can maintain the normal operation.

Here, when the temperature detection sensor RT fails in the short-circuit mode, the first comparison circuit IC1,1 / 2
Of the input terminal 3 becomes larger than the voltage of the input terminal 2, and the output terminal 1 of the IC1, 1/2 becomes H. Hereinafter, the same circuit operation as when the temperature of the temperature detection sensor RT rises is performed. Then, the heater H is turned off.

[0024]

As described above, according to the present invention, a disconnection is detected by comparing and detecting an abnormal resistance value on the temperature detecting sensor side with a first comparing circuit for comparing the detected temperature of the temperature detecting sensor with the set temperature and controlling the temperature. In a heating toilet seat control device including two comparison circuits with a second comparison circuit, a power supply reset circuit, a priority circuit, and an RS flip-flop circuit are provided in a stage next to the second comparison circuit that performs disconnection detection, It is assumed that the priority circuit gives priority to the power reset signal over the disconnection detection signal, and the priority circuit and the RS flip-flop circuit have four NAs.
The effect of providing a safe and secure control device for a heated toilet seat that is configured with an ND theoretical circuit, prevents a malfunction due to power supply noise or the like when a temperature detection sensor or a lead wire is disconnected or partially disconnected, and can securely lock the system. There is.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a control device for a heated toilet seat according to an embodiment of the present invention.

FIG. 2 is a circuit diagram of a conventional heating toilet seat control device.

[Explanation of symbols]

 1 power supply reset circuit 2 priority circuit 3 RS flip-flop circuit

──────────────────────────────────────────────────続 き Continued on the front page (58) Fields surveyed (Int.Cl. ⁶ , DB name) A47K 13/30 E03D 9/08

Claims (2)

(57) [Claims] 1. A first comparison circuit for comparing a detection temperature of a temperature detection sensor with respect to a set temperature and performing temperature control, and a second comparison circuit for comparing and detecting an abnormal resistance value on the temperature detection sensor side and detecting disconnection. In the heating toilet seat control device provided with the two comparison circuits, a power supply reset circuit, a priority circuit, and an RS flip-flop circuit are provided at a stage next to the second comparison circuit that performs the disconnection detection. A control device for a heated toilet seat, wherein a reset signal is prioritized. 2. The heating toilet seat control device according to claim 1, wherein the priority circuit and the RS flip-flop circuit are constituted by four NAND logic circuits.