MUMBAI, India, Oct. 26 -- Intellectual Property India has published a patent application (202617091609 A) filed by Danfoss As on July 28, 2026, for Method And Circuit For Measuring Properties Of An Alternating Primary Voltage Through A Galvanic Isolation Barrier.
Inventors include Havn, Torben Boye; and Dinoi, Umberto.
The application for the patent was published on October 23, 2026, under issue no. 43/2026.
Abstract: The invention relates to a method for measuring properties of an alternating primary voltage (PRV) with a primary frequency (PRf) at a first side of a galvanic isolation barrier (GAB) at a second side of the latter. It includes generating a primary signal (PRS) from the primary voltage (PRV) with at least partial rectification, and generating, using an operational amplifier (25) of a modulator (20), a pulse width modulated signal (PWMS) from the primary signal (PRS) using a carrier signal (CAS). A duty cycle ratio of the pulse width modulated signal (PWMS) varies in accordance with a time-varying voltage value (PRS(t)) of the primary signal (PRS). An optocoupler (44) transmits the pulse width modulated signal (PWMS) to the second side. The method includes a zero cross signal generation step (S60) and/or an amplitude signal generation step (S70). For reliability and cost-efficiency, a pulse width modulation switching frequency (PWMf) of the pulse width modulated signal (PWMS) exceeds 10 times the primary frequency (PRf). The modulator (20) uses an oscillating circuit for generating the carrier signal (CAS). The operational amplifier (25) forms part of the oscillating circuit. The invention further relates to an electric circuit (1, 1A, 100) and a control unit (200) for a refrigerant compressor (300).
Disclaimer: Curated by HT Syndication.
