发明名称 |
Ringer power generator circuit for carrier subscriber station terminal |
摘要 |
A ringer-power generator circuit is provided in which ring pulses cause positive and negative output voltages of a swinging choke regulator to be alternately connected to one of the tip and ring lines of a handset; and cause a control circuit to be alternately connected to and disconnected from a supply voltage. The control circuit has an RC timing circuit which delays initial turn on of the regulator to prevent bell tapping, and includes a transistor, diodes and timing circuit which control maximum output power and maximum output voltage of the regulator for causing the latter to essentially operate as a voltage limited high impedance source.
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申请公布号 |
US4152546(A) |
申请公布日期 |
1979.05.01 |
申请号 |
US19770827529 |
申请日期 |
1977.08.25 |
申请人 |
GTE AUTOMATIC ELECTRIC LABORATORIES INC |
发明人 |
STEWART, JAMES A |
分类号 |
H04J1/14;(IPC1-7):H04J1/00;H04M1/26 |
主分类号 |
H04J1/14 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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