Method and apparatus for electric arc detection
AssigneeSMA Solar Technology AG
InventorMartin Putz
Life of this patent
Estimating the term…
Abstract
A method for detecting high-frequency AC currents in a DC circuit including a common mode choke with two partial windings includes tapping voltages dropping across the two partial windings due to the AC current, superposing the tapped voltages, and obtaining a superposed AC voltage wherein differential mode portions of the tapped voltages are summed constructively and common mode portions of the voltages are summed destructively; and measuring the superposed AC voltage.
Claims20
A method for detecting high-frequency AC currents in a DC circuit comprising a common mode choke with two partial windings, comprising:
- tapping voltages dropping across the two partial windings due to the AC current;
- superposing the tapped voltages and obtaining a superposed AC voltage using a superposition circuit, wherein differential mode portions of the tapped voltages are summed constructively and common mode portions of the tapped voltages are summed destructively;
- and
- measuring the superposed AC voltage using a voltage sensing device.
An apparatus for detecting high-frequency AC currents in a DC circuit comprising a common mode choke with two partial windings, the apparatus comprising:
- tapping circuits configured to tap voltages dropping across the two partial windings;
- a superposition circuit configured to superpose the tapped voltages, wherein differential mode portions of the tapped voltages are summed constructively and common mode portions of the voltages are summed destructively, and a superposed AC voltage is obtained at an output thereof;
- and
- a measurement device coupled to the output of the superposition circuit and configured to measure the superposed AC voltage.
Dependencies are inferred from the claim text.