EMC filter, for connection between a mains supply network and a mains-operated appliance to reduce conduction noise between said supply network and said appliance, comprising a voltage divider connected to said mains network, for generating a voltage lower than a voltage of said mains network; recti
EMC filter, for connection between a mains supply network and a mains-operated appliance to reduce conduction noise between said supply network and said appliance, comprising a voltage divider connected to said mains network, for generating a voltage lower than a voltage of said mains network; rectifying means, connected to an output of said voltage divider, for generating a DC voltage; and an electronic active circuit, supplied by said DC voltage, for absorbing a noise current transmitted between said supply network and said appliance.
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The invention claimed is: 1. An EMC filter, for connection between a supply network having phase conductors and an electric operated appliance to reduce conduction noise between said supply network and said appliance, said filter comprising: a rectifier, for converting an AC voltage supplied by the
The invention claimed is: 1. An EMC filter, for connection between a supply network having phase conductors and an electric operated appliance to reduce conduction noise between said supply network and said appliance, said filter comprising: a rectifier, for converting an AC voltage supplied by the supply network into a DC voltage, a voltage reducing circuit, for reducing said DC voltage, wherein said voltage reducing circuit comprises a voltage divider having a first set of capacitors and a second set of capacitors in a delta arrangement. each of the first set of capacitors directly connected to a respective one of the phase conductors of the supply network and each of the second set of capacitors connected between the first set of capacitors and the rectifier; and an electronic active circuit, supplied by said reduced DC voltage, for absorbing a noise current transmitted between said supply network and said appliance. 2. The filter of claim 1, wherein said voltage reducing circuit is connected to said supply network and supplies to said rectifier an AC voltage lower than a voltage of said supply network. 3. The filter of claim 1, wherein said voltage reducing circuit is made up of delta-connected passive elements. 4. The filter of claim 1, wherein said rectifier comprises a bridge of diodes. 5. The filter of claim 1, wherein said rectifier comprises an AC-DC converter. 6. The filter of claim 1, wherein said active electronic circuit comprises an integrated operational amplifier. 7. The filter of claim 6, wherein said operational amplifier is a MOSFET amplifier. 8. The filter of claim 6, further comprising security elements for protecting the amplifier against overvoltages, fast or important du/dt or di/dt variations, and/or for detecting and transmitting anomaly conditions. 9. The filter of claim 1, further comprising monitoring means for detecting a malfunctioning of said filter. 10. The filter of claim 9, wherein said monitoring means are arranged to detect a variation in said DC voltage. 11. The filter of claim 9, wherein said monitoring means are arranged for detecting a variation in an output terminal of an amplifier comprised in said active circuit. 12. The filter of claim 9, wherein said monitoring means generate a status signal and wherein said status signal is connected to the input of an acoustic or an optical transducer of said filter. 13. The filter of claim 9, wherein said monitoring means generate a status signal and further comprising a status output connection, for transmitting said status signal to external components. 14. The filter of claim 6, wherein said operational amplifier is a MOSFET amplifier, further comprising a supply output connector, connected to said DC voltage. 15. The filter of claim 14, further comprising an isolated DC-DC converter, said supply output connector being connected to an output of said DC-DC converter. 16. The filter of claim 1, wherein said operational amplifier is a MOSFET amplifier, further comprising at least one inductor, connected between said supply network and said electric operated appliance, wherein said inductor comprises an essentially straight conductor section in a magnetic core. 17. The filter of claim 1, wherein said operational amplifier is a MOSFET amplifier, further comprising at least one inductive means, connected between said supply network and said electric-operated appliance, wherein said inductor comprises one or two turns, around a magnetic element. 18. The filter of claim 1, further Comprising a star-point circuit including passive elements connected between each power supply line of said supply network and a star-point, wherein the current flowing through said electronic active circuit depends on the potential on said star-point circuit. 19. The filter of claim 1, comprising at least one inductive device connected to the power supply lines in a manner to transfer inductively the noise current to the electronic circuit. 20. The filter of claim 19, in which said inductive device comprises secondary windings, inductively coupled to the power lines. 21. The filter of claim 20, in which said inductive device comprises a common magnetic circuit coupled to all phases of the power line, for coupling a common mode noise current. 22. The filter of claim 20, in which said inductive device comprises independent magnetic circuits individually coupled to each phase of the power line, for coupling a differential mode noise current. 23. The filter of claim 1, wherein the electronic circuit is connected to a virtual shunt node inductively associated to a node of the conductors lines of the supply network. 24. The filter of claim 1, wherein each of the capacitors of the second set of capacitors is connected to two capacitors of the first set of capacitors. 25. An EMC filter, for connection between a supply network and an electric operated appliance to reduce conduction noise between said supply network and said appliance, said filter comprising: a rectifier, for converting an AC voltage supplied by the supply network into a DC voltage, a voltage reducing circuit, for reducing said DC voltage, wherein said voltage reducing circuit comprises a voltage divider having a first set of capacitors and a second set of capacitors in a delta arrangement, each of the first set of capacitors directly connected to a respective one of the phase conductors of the supply network and each of the second set of capacitors connected between the first set of capacitors and the rectifier; an electronic active circuit, supplied by said reduced DC voltage, for absorbing a noise current transmitted between said supply network and said appliance; and, at least one inductive device connected to the power supply lines in a manner to transfer inductively the noise current to the electronic circuit, wherein said at least one inductive device comprises secondary windings, inductively coupled to the power lines.
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이 특허에 인용된 특허 (6)
Kalman, Gabor; Huggett, Colin, AC-to-ac power converter without a dc link capacitor.
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