| 摘要 |
FIELD: physics; radio. ^ SUBSTANCE: present invention pertains to transformation technology and can be used in power-line filters of radio interference. The technical outcome of the invention is the profound suppression of non-symmetrical electromagnetic interference with simultaneous meeting of electrical safety requirements on limiting capacitive leakage currents. Proposal is given of a method of reducing capacitive leakage currents on power-line radio interference filters, comprising one or more nodes, each of which is connected through a capacitor to the power-line filter lines and the case. The potential of one of the nodes is varied such that, the potential difference at low frequency between the given node and the case approaches zero. Potential of similar nodes of other sections of the filter are simultaneously controlled through chokes, decoupling at high frequency. As a result of reducing the potential difference at low frequency between the node and the case down to zero, all leakage currents on the case are practically eliminated. In particular, to implement the method, a signal is generated, proportional to the voltage between one of the indicated nodes and the case. That signal is applied to the input of a duo-directional amplifier, at the positive supply input of which a more positive voltage is applied through rectification, acting on the lines of the power-line filter at points of connection to capacitors of the given node. At the negative supply input of the duo-directional amplifier, a more negative voltage is applied through rectification from the same points of the lines of the power-line filter. Capacitors are re-charged by the output current of duo-directional amplifier and as a result, voltage between the given node and the case of the filter at low frequency is practically reduced to zero and consequently, all leakage currents on the case are eliminated. ^ EFFECT: reduced capacitive leakage currents of power-line filters of radio-interference. ^ 2 cl, 3 dwg |
