Electronic ring trip circuit专利检索-去振铃图形技术专利检索查询-专利查询网

Electronic ring trip circuit

阅读：221发布：2021-09-08

专利汇可以提供Electronic ring trip circuit专利检索，专利查询，专利分析的服务。并且A circuit to detect the off-hook condition of a telephone subscriber station after the application of ringing current to operate the station signaling device. The circuit employs a pair of light emitting diodes, connected in an inverse parallel configuration, in series with one of the line conductors and light coupled to a pair of associated photo transistors. The photo transistors operate to alternately charge and discharge an RC circuit in response to the passage of an A.C. ringing current through the line, but upon detecting a direct current flow in the line conductor bring the RC circuit to a fully charged state to trip a load circuit to remove the ringing current from the line.，下面是Electronic ring trip circuit专利的具体信息内容。

权利要求

1. In a ring cut-off arrangement of the type comprising switching means interposed in the ringing circuit to operate in response to said circuit being traversed by direct current, but to remain unoperated when said circuit is traversed by alternating ringing current alone, the improvement being that said switching means comprises: first and second light emitting diodes connected in inverse parallel in series in said ringing circuit to alternately glow as they alternately conduct the ringing signal, and only one of them glow during the flow of a direct current in said circuit, a source of operating potential having a first and a second terminal, a first and a second resistor in series and connected across said operating potential terminals, a capacitor connected at one end to said first one of said operating potential terminals, and means connecting the other end of said capacitor intermediate said first and second resistors whereby said capacitor is maintained at a first nominal charge level by said resistors, first and second two terminal light sensitive switch means of the type adapted to be rendered conductive when illuminated, respectively operatively associated with said light emitting diodes and connected in series across said operating potential terminals, other means connecting the junction of said two light sensitive switch means to the other end of said capacitor, said light sensitive switches responding to the glow from said associated diodes to alternately raise and lower the nominal charge state of said capacitor during the flow of an alternating current in said circuit, only one of them remaining conductive to increase the charge of said capacitor during the flow of a direct current in said circuit, and switch means responsive to the increased charge of said capacitor to remove said ringing current from said circuit.

2. In a ring cut-off arrangement according to claim 1 further including a resistor in parallel with said light emitting diodes to increase the current carrying capabilities of said circuit.

3. In a ring cut-off arrangement according to claim 2 including a variable resistor in series with each said light emitting diode to compensate for inequalities in their characteristics.

4. In a ring cut-off arrangement according to claim 3 wherein said switch means includes an amplifier operatively connected to said capacitor other terminal responding to said increased charge on said capacitor to increase its output, a relay having break contacts in said circuit and operated in response to said amplifier increased output to remove said ringing current from said circuit.

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Electronic ring trip circuit

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