JP2581488Y2 - Safety device for heating toilet seat - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for a heated toilet seat heated by a heater.

[0002]

2. Description of the Related Art As a safety device for a heating toilet seat, a fuse or a bimetal that opens an energizing circuit by detecting an excessive temperature rise is used. A safety device that detects an excessive current and stops energization of the electrical components of the toilet bowl is known from Japanese Patent Publication No. 5-48338.

[0003]

When a heater or a cord is about to be disconnected, a current significantly lower than a steady current flows to the heater continuously or intermittently. An object of the present invention is to provide a safety device that detects such an undercurrent and stops energizing the heater.

[0004]

SUMMARY OF THE INVENTION A safety device for a heated toilet seat according to the present invention is provided with a detector for detecting a current supplied to the heated toilet seat and a detector for detecting the current when the heated toilet seat is in an energized state. A comparator for comparing whether the current value is in a range between a preset lower limit value and an upper limit value, and a comparator capable of outputting a signal indicating that the detected current value is out of the range. And an energization stop holder for stopping energization to the heating toilet seat in response to the signal from the comparator and holding the energization stop state.

[0005]

When the current supplied to the heater of the heating toilet seat is excessively large or small, the current supply stop holder operates to stop the current supply to the heater, and this state is maintained.

[0006]

FIG. 1 is a circuit diagram of a safety device for a heated toilet seat according to an embodiment. The commercial power supply 1 is connected to a heater 5 via a solid state relay 2, a temperature fuse 3 and a fuse 4.

A current detection coil 6 is provided in the middle of a circuit for supplying electricity to the heater 5, and a detection current value of the coil 6 is input to a current value comparison circuit 7. The current value comparison circuit 7 compares whether the current value detected by the coil 6 falls within a range between a preset lower limit value and an upper limit value, and when the detected current value falls outside this range. An H level signal is output to the AND circuit 8.

A temperature-sensitive thermistor 9 is provided near the heater 5, and a temperature signal detected by the thermistor 9 is input to a temperature control circuit 10. Temperature control circuit 1
0 indicates that the power supply to the heater 5 is stopped when the temperature detected by the thermistor 9 reaches the set temperature, and the power is supplied to the heater 5 when the detected temperature of the thermistor 9 becomes lower than the set temperature.
The control is performed. The output current of the temperature control circuit 10 is supplied to the solid state relay 2 via a resistor R.
Is supplied to the photodiode 2a which constitutes a part of.
The output of the temperature control circuit 10 is also input to the AND circuit 9.

The output of the AND circuit 9 is input to a holding circuit 11. The holding circuit 11 is configured to output an H signal when the output signal of the AND circuit 9 becomes H level until the entire safety device is turned off.

The output signal of the holding circuit 11 is input to the base of an NPN transistor 12. The transistor 12 is provided in parallel with the photodiode 2a.

The current value comparison circuit 7, the temperature control circuit 10 and the holding circuit 11 are supplied with DC power obtained by transforming and rectifying AC power from a commercial power supply.

In the safety device for a heating toilet seat configured as described above, when a main switch (not shown) is turned on,
The temperature control circuit 10 outputs an H signal, the solid state relay 2 is turned on, and the heater 5 is energized. Then, based on the detected temperature signal of the thermistor 9, the current supplied to the heater 5 is turned ON and OFF, and the toilet seat is maintained at an appropriate temperature.

If there is no abnormality in the heating toilet seat device, the detected current value of the coil 6 is 0 or in a steady range.

When the current value is 0, the output of the comparison circuit is H, but the output of the temperature control circuit 10 is L.
The output of the circuit 8 is L, the output of the holding circuit 11 is also L, and the transistor 12 is OFF.

On the other hand, when the current value is in the steady range, the output of the temperature control circuit 10 is H, but the output of the comparison circuit 7 is L. Is OFF.

When the detected current value of the coil 6 becomes excessively large or small, the output of the comparison circuit 7 becomes H. And
At this time, if the output of the temperature control circuit 10 is H, AND
The output of the circuit 8 becomes H, and the output of the holding circuit 11 also becomes H. As a result, the transistor 12 is turned on, the photodiode 2a is turned off, and the power supply to the heater 5 is stopped. This energization stop state is continued until the entire safety device is turned off.

As described above, not only when the current supplied to the heater 5 becomes excessively large, but also when the current supplied to the heater 5 becomes excessively small,
Since the power supply to the heating toilet seat is stopped and this power supply stopped state is maintained, the safety of the heating toilet seat can be further enhanced.

In this embodiment, the fuse 4 is used. However, as described above, when an excessive current flows through the heater 5, the state in which the power supply to the heater 5 is stopped is maintained. You can use bimetal instead.

Incidentally, the capacity of the heater of a normal heating toilet seat is 5
It is about 0 W, and the normal energizing current is about 0.5 A. In the present invention, it is preferable that the power supply to the heater is stopped when the current supplied to the heater is out of the range of 50 to 300%, particularly 70 to 150% of the steady current.

[0020]

[Effect of the Invention] As described above, the safety device for a heated toilet seat of the present invention immediately stops the power supply to the heater not only when the current supplied to the heater of the toilet seat becomes excessively large but also when the current becomes too small. In addition, the power supply stop state is maintained. Therefore, even in the case of a rare open or a rare short, the power supply can be stopped accurately and the safety is extremely excellent.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a safety device for a heated toilet seat according to an embodiment.

[Explanation of symbols]

 2 Solid state relay 5 Heater 6 Current detection coil 7 Current value comparison circuit 8 AND circuit 9 Thermistor 10 Temperature control circuit 11 Holding circuit

Claims (1)

(57) [Scope of request for utility model registration] 1. A detector for detecting a current supplied to a heating toilet seat, wherein a current value detected by the detector when the heating toilet seat is in an energized state is a predetermined lower limit value and an upper limit value. A comparator capable of outputting a signal indicating that the detected current value is out of the range; and a heating toilet seat according to the signal from the comparator. And an energization stop retainer for stopping energization of the heating toilet and maintaining the energization stop state.