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    Temperature compensated, regulated power supply and battery charger for railroad signal use
    1.
    发明授权
    Temperature compensated, regulated power supply and battery charger for railroad signal use 失效
    温度补偿，稳压电源和电池充电器用于铁路信号使用

    公开(公告)号：US5451857A

    公开(公告)日：1995-09-19

    申请号：US945236

    申请日：1992-09-15

    申请人： James E. Moe

    发明人： James E. Moe

    IPC分类号： H02J7/00 ,  H02J7/10

    CPC分类号： H02J7/008 ,  Y10S320/36

    摘要： A temperature compensated, regulated power supply and battery charger for supplying power to railroad warning lights and crossing gates utilizes a ferroresonant transformer having a primary winding, a secondary winding, and a resonant circuit in magnetic circuit therewith. Voltage regulation is accomplished at essentially no load conditions by the use of a temperature sensing element and a shunt regulator connected in circuit with the output terminals of the secondary winding. The shunt regulator varies the output voltage at the output terminals in response to temperature sensed by the temperature sensing element during essentially no load conditions.

    摘要翻译： 用于向铁路警示灯和交叉门供电的温度补偿调节电源和电池充电器利用具有初级绕组，次级绕组和与其磁路中的谐振电路的铁磁共振变压器。 通过使用与次级绕组的输出端子电路连接的温度感测元件和分流调节器，在基本上无负载条件下实现电压调节。 分流调节器响应于在基本无负载条件下由温度感测元件感测到的温度，来改变输出端子处的输出电压。

    Power supply control circuit for subscriber carrier telephone system
    2.
    发明授权
    Power supply control circuit for subscriber carrier telephone system 失效
    用户电话系统的电源控制电路

    公开(公告)号：US4380687A

    公开(公告)日：1983-04-19

    申请号：US248129

    申请日：1981-03-27

    申请人： James A. Stewart

    发明人： James A. Stewart

    IPC分类号： H04M19/08 ,  H04M19/06

    CPC分类号： H04M19/08 ,  Y10S320/13 ,  Y10S320/36

    摘要： A control circuit 16 that is responsive to voltage conditions on a cable pair transmission line for selectively disabling a battey charging circuit 12 operating off of line current comprises a resistor R5 and storage capacitor C2 connected in series across the line; a timing capacitor C1 connected between the cathode of a PUT (programmable unijunction transistor) and one wire 32 of the line; and a zener diode D1 between the PUT anode and one wire 32 for establishing a conduction threshold for the PUT. The resistor R5 and primary conduction path of a first bipolar transistor Q2, having its base connected to the PUT anode, are connected in series between the other wire 33 of the line and the charging circuit so that startup current for the charging circuit may be used for charging C2 when the charging circuit is disabled. Means is also included for driving the PUT gate voltage low and turning on the PUT in response to both high and low voltage conditions on the line. This dumps the C2 charge into C1, the latter discharing slowly for holding the charging circuit diasabled. A second bipolar transistor Q4 senses the charge voltage on C1 for decreasing the PUT gate voltage when the PUT conducts and for increasing the PUT gate voltage immediately prior to the control circuit enabling the charging circuit to draw line current in order to prevent on-off cycling of the latter on a long cable pair.

    摘要翻译： 响应于电缆对传输线上的电压条件的控制电路16，用于选择性地禁用线路电流运行的电池充电电路12包括串联连接的电阻器R5和存储电容器C2; 连接在PUT（可编程单结晶体管）的阴极和线路的一根线32之间的定时电容器C1; 以及PUT阳极和一根导线32之间的齐纳二极管D1，用于建立PUT的导通阈值。 电阻器R5和其基极连接到PUT阳极的第一双极晶体管Q2的一次导通路径串联连接在线路的另一导线33和充电电路之间，使得可以使用充电电路的启动电流 用于对充电电路进行充电C2。 还包括用于将PUT栅极电压驱动为低电平并且响应于线路上的高电压和低电压条件而导通PUT的装置。 这将C2电荷转化为C1，后者缓慢地将充电电路保持在正常状态。 第二双极晶体管Q4感测C1上的充电电压，用于当PUT导通时降低PUT栅极电压，并且在控制电路之前立即增加PUT栅极电压，使得充电电路能够绘制线电流，以防止开关循环 后者在长电缆对上。