The invention relates to a method for alternating a heating mode of operation and a capacitive measurement mode of operation by means of a common heating wire (2), comprising: performing the heating mode of operation, during which a plurality of switching elements (3a, 3b, 4a, 4b) are in a conducting state by switching on a control circuit (6a, 6b), the switching elements (3a, 3b, 4a, 4b) being connected in series, such that the heating wire (2) is supplied with a heating current from two different heating potentials (VH +, VH-); switching to a detection mode is triggered by the control circuit (6a, 6b), such that the switching element (3a, 3b, 4a, 4b) is switched from a heating mode to a measuring mode, during which the switching element (3a, 3b, 4a, 4b) is in an off state, such that in the heating mode, the heating wire (2) differs from two different heating potentials (VH +, VH +, VH +, VH +, VH +, VH +, VH +, VH +, VH +, VH +, VH +, VH +, VH +, VH +, VH +, VH +, VH +, VH +, VH +, VH +, VH +). VH-) in the measurement mode of operation, each of the two electrically conductive connections being interrupted a plurality of times; performing a measurement mode of operation in which the capacitance of the heating wire (2) relative to a reference potential is determined by applying an alternating voltage (VAC) of an alternating voltage source (12) to the heating wire (2) by the detection circuit (9); the invention also relates to an associated circuit arrangement (1).
本发明涉及一种用于通过共用的加热金属丝(2)来使加热工作方式和电容式测量工作方式交替操作的方法,包括:执行加热工作方式,在加热工作方式期间通过控制电路(6a,6b)接通使得多个开关元件(3a,3b,4a,4b)处于导通状态,开关元件(3a,3b,4a,4b)串联连接,使得加热金属丝(2)被供给来自两个不同的加热电势(VH+,VH‑)的加热电流;通过控制电路(6a,6b)触发切换到检测工作方式,使得开关元件(3a,3b,4a,4b)从加热工作方式切换到测量工作方式,在测量工作方式期间开关元件(3a,3b,4a,4b)处于截止状态,使得在加热工作方式中加热金属丝(2)与两个不同的加热电势(VH+,VH‑)的这两个导电连接在测量工作方式中分别多次中断;执行测量工作方式,其中通过由检测电路(9)将交流电压源(12)的交流电压(VAC)施加至加热金属丝(2)来测定加热金属丝(2)相对于参考电势的电容;本发明还涉及一种相关的电路构造(1)。
Circuit arrangement for alternating operation of heating mode of operation and capacitive measurement mode of operation, and associated method
用于交替操作加热工作方式和电容式测量工作方式的电路构造以及相关的方法
2023-04-07
Patent
Electronic Resource
Chinese
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