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Method for detecting and monitoring electrical alternating voltage in furnace of heating system, involves determining level of voltage based on cycle of pulse-width modulated signal, and comparing level with limit value
Method for detecting and monitoring electrical alternating voltage in furnace of heating system, involves determining level of voltage based on cycle of pulse-width modulated signal, and comparing level with limit value
The method involves rectifying a half wave of electrical alternating voltage (Ue), and applying the voltage to an input of a comparator (V) over voltage dividers (Rx, Ry). The voltage is compared with a reference voltage (Uref) lying at another input of the comparator, such that a pulse-width modulated signal is produced. The pulse-width modulated signal is transmitted to a signal evaluation device i.e. microprocessor, over an opto-coupler. Level of the voltage is determined by the evaluation device based on a duty cycle of the pulse-width modulated signal and compared with a limit value. An independent claim is also included for a circuit for detecting and monitoring electrical alternating voltage.
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