The present invention relates to a circuit and a method for performing an alternating heating operation and a capacitance measurement operation by means of a common heating line, comprising the steps of: performing a heating operation in which a pair of first switching elements and a pair of second switching elements, which are connected in series with a heating line, are in a conductive state by switching of a control circuit; the heating wire is conductively connected to one of different heating potentials via the first and second switching elements, respectively, such that a heating current is applied to the heating wire; the control circuit triggers the first and second switching elements to switch to a measuring operation, so that the two conductive connections are interrupted multiple times in the measuring operation; performing a measurement operation in which the detection circuit applies an AC voltage of the AC voltage source to the heating wire to determine a measurement capacitance of the heating wire with respect to the reference potential; a test phase is performed, the control circuit switches the test circuit such that the test impedance is connected to the measurement capacitance, and the detection circuit detects at least an associated change in the measurement capacitance and/or determines the total impedance.
本发明涉及一种借助公共加热线执行交替加热运行和电容测量运行的电路和方法,包括步骤:执行加热运行,通过控制电路的切换,一对第一开关元件和一对第二开关元件处于导电状态,所述第一和第二开关元件与加热线串联连接;加热线分别经由第一和第二开关元件导电连接至不同的加热电势中的一个,使得向加热线施加加热电流;控制电路触发第一和第二开关元件切换到测量运行,使得两个导电连接在测量运行中被多次中断;执行测量运行,其中检测电路向加热线施加交流电压源的交流电压来确定加热线相对于参考电势的测量电容;执行测试阶段,控制电路将测试电路切换成使得测试阻抗连接测量电容,并且检测电路至少检测测量电容的相关变化,和/或确定总阻抗。
Circuitry for alternating heating operation and capacitance measurement operation and related methods
用于交替加热运行和电容测量运行的电路系统及相关方法
2023-07-28
Patent
Electronic Resource
Chinese
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