Electric heating – Heating devices – Combined with container – enclosure – or support for material...
Patent
1976-08-24
1978-09-26
Bartis, A.
Electric heating
Heating devices
Combined with container, enclosure, or support for material...
165 18, 219378, 219491, 219493, 219497, H05B 102, F24H 704, F24D 1100
Patent
active
041173074
ABSTRACT:
A charging apparatus for an electric storage heater includes a resistance heater in series with a low tariff time switch and a charging switch. While the low tariff time switch is closed, usually at night, an integrator controlled by a differential amplifier controls the charging switch in accordance with the total charge accumulated by the integrator which reflects the use of energy during the preceding day. The charge of the integrator at the end of the day is the result of it being intermittently charged and discharged by a voltage divider circuit which has one or more temperature responsive resistances and transmits a voltage to one input of a differential amplifier for the integrator which can be above or below a reference voltage on the other input of the amplifier. The relay of a fan which drives heat from the storage heater may be actuated by an amplifier which has negative and positive feedback means which produces a trigger dead zone for delaying the actuation of the relay for both the starting and the stopping of the fan.
REFERENCES:
patent: 3975620 (1976-08-01), Hallgreen et al.
patent: 4039773 (1977-08-01), Iversen
Hanson Borge Bernhard
Iversen Poul Christian Carlos
Thorsoe Flemming
Bartis A.
Danfoss A/S
Easton Wayne B.
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