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    • 9. 发明授权
    • SCHALTUNGSANORDNUNG ZUM SCHUTZ EINES HEIZELEMENTS VOR ÜBERHITZUNG, HEIZVORRICHTUNG UND VERFAHREN ZUM ABSICHERN DER HEIZVORRICHTUNG
    • 电路用于保护加热元件上热,加热装置和方法,用于固定加热器
    • EP1700177B1
    • 2009-08-05
    • EP04804770.8
    • 2004-12-10
    • BSH Bosch und Siemens Hausgeräte GmbH
    • OTTO, ManuelSCHWEIER, PeterSTICKEL, MartinWAGNER, Franz-Josef
    • G05D23/24
    • H05B1/0283G05D23/2401
    • The invention relates to a circuit arrangement, for the protection of a heating element (1) from overheating, the resistance value of which is a function of the temperature thereof, whereby the resistance arrangement has the following features: a power supply, connected to the heating element (1), for supply of a current to the heating element (1), by means of a switch (2), a switch control circuit (3) with an output (34), for control of the switching means (2), the switching means (2) being switched into a conducting state when the switch control circuit (10) is in a first state and switched into a non-conducting state when the switch control circuit (3) is in a second state, a current sensor means (4), coupled to the heating element (1), the output (41) of which provides a signal proportional to the current flowing through the heating element (1), a first scaling means (5), the output (51) of which provides a signal proportional to the supply voltage of the heating element (1), a first detector means (6), with inputs (62, 63) each coupled to the outputs (41, 51) of the current sensor means (4) and the first scaling means (5), the output (66) of which provides a difference voltage from the signals from the current sensor means (4) and the scaling means (5) and an analytical circuit (7;8;9;10), by means of which the difference voltage, determined by the first detector means (6) may be compared with a reference signal and, depending on the result of which, the switch control circuit (3) may be taken from the first state to the second state by the analytical circuit (3).