jime@tekig3.LEN.TEK.COM (James W. Edwards) (06/16/89)
I have a problem for you electronics wizards. I would like to control the DC power being supplied to two loads as shown in the following diagram: +--[Load 1]-------------[CP1]-------------+-------+ | | | | | DC +--[Load 2]-------------[CP2]-------------+ POWER | | | | | | +-------------------------------------------------+ | GND CP1/2 = Control Points 1/2 I would like to be able to turn on/off the power to either of the loads through CP1/CP2. CP1/CP2 are simply whatever electrical component(s) that you feel would be necessary to achieve this objective. The switching action of CP1/2 must be controllable through a digital signal. CP1/2 must each be able to switch 15A @ 12/24 V to their loads. The switching action is actually more complicated than just switching on/off: In the off position, the associated load must still recieve some power (say 10%), and in the on position it will recieve full power. Furthermore, when switching from off to on or from on to off, the rise or fall in current/voltage to a load must be controlled (for example, it could rise/fall exponentially to the final voltage/current). The intended circuit must be very reliable and operate in a harsh environment (-70F to 150F and high, non-condensing humidity). If it matters, the power source is regulated, but probably fairly noisy due to the surrounding environment. Finally, it is very desirable that the most likely failure mode will result in both loads recieving full power (i.e. CP1/2 switched on). Thanks in advance! Jim Edwards