Matsushita Electric Industrial Co., Ltd.

The High Pressure Gas Safety Institute of Japan

Kunio Kimata

Hiroshi Horii

Hideho Shinoda

Shinichi Endo

Hidenobu Hasegawa

Yasukiyo Ueda

Mitsuo Namba

Shinichi Nakane

Hirofumi Aoyagi

Shunichiro Mori

Hirofumi Aoygi

Kunio Ogita

Shun'ichiro Mori

Piping leakage detecting apparatus

A warming apparatus for use during sleep includes at least one of a temperature-up timer circuit for raising a temperature of an electric heater by an amount in the range of 2.degree. C. to 6.degree. C. for a predetermined time and thereafter restoring the temperature of the electric heater to a preset ordinary temperature, and a temperature-dowm timer circuit for lowering the temperature of the electric heater by an amount in the range of 2.degree. C. to 6.degree. C. for a predetermined time and thereafter restoring the temperature of the electric heater to the preset ordinary temperature, each of the temperature-up timer circuit and the temperature-down timer circuit being actuated while the warming apparatus is in operation.

Warming apparatus for use during sleep

In a bed warmer such as an electric blanket initially subject to a preparatory high temperature set value, the supply of power to a heater is controlled such that a warmer temperature is automatically recovered to a preset temperature value provided by a temperature setter from the preparatory high temperature set value when a bodily temperature detector detects that the user has goes to bed.

Bed warmer with a body temperature sensor for stopping a higher preset

A system comprising a heat generating load, a power control element for controlling power supply to the heat generating load, a temperature detecting circuit for producing an ON signal when the temperature of the load detected by a temperature sensor is lower than a set temperature and an OFF signal when the temperature has reached the set temperature, and a control circuit for feeding on ON or OFF signal to the power control element in response to the signal from the temperature detecting circuit. The control circuit includes a hysteresis control circuit which, once the temperature detecting circuit detects that the temperature has reached the set temperature, permits the power control element to receive OFF signals for a suitable period of time even after the temperature has subsequently lowered to a level at which the signal from the temperature detecting circuit changes to an ON signal. Under the electronic temperature control, the temperature of the article to be heated swings over a predetermined range, giving stimulating and comfortable warmth to the human body.

Temperature control system for electric heating apparatus

A system comprising a heat generating load such as a heater, a power control element for directly or indirectly supplying current to the heat generating load, a temperature detecting circuit for producing an ON signal when the temperature of the heat generating load is lower than a set temperature and an OFF signal when the temperature is higher than the setting, and a control circuit for feeding an ON or OFF signal to the power control element in response to the ON or OFF signal from the temperature detecting circuit. The control circuit includes a failure detecting circuit for logically comparing the signal from the temperature detecting circuit with the terminal voltage across the power control element to produce output when the power control element is in conduction although the signal from the temperature detecting circuit is an OFF signal. Upon the failure of the power control element, for example, due to self-triggering, the failure is detected directly by the failure detecting circuit and, in response to the resulting output therefrom, the power supply to the heat generating load is stopped to assure safety.

Temperature control system for electric heating appliance

Growing community of inventors

Kyoto, Japan

Kunio Kimata