Very regularly we omit to change off the peripherals like screen, scanner, and printer while switching off our PC. The problem is that there are separate power switches to show the peripherals off. Normally, the peripherals are related to a single of these four-way trailing sockets that are plugged into a single wall socket. If that socket is obtainable, all the tools may be swaped off from there and none of the equipment used will require any change.
Here is a majors supervisor circuit that lets you flip all of the tools on or off via just running the swap on any probably the most softwares; as an instance, whilst you switch off your PC, the monitor in addition to different gear will get powered down automatically. You could select the primary tools to keep watch over different devices.
The main gear is to be straight away plugged into the grasp socket, while all other equipment are to be related via the slave socket. The primarys provide from the wall socket is to be linked to the input of the mains manager circuit. The unit functions by sensing the current drawn through the control tools/load from the master socket. On sensing that the keep a watch on equipment is on, it powers up the opposite (slave) sockets.
The load on the master socket can be anyplace between 20 VA and 500 VA, whereas the burden on the slave sockets can be 60 VA to 1200 VA. During the positive half of cycle of the primarys AC supply, diodes D4, D5, and D6 have a voltage drop of about 1.8 volts when present is drawn from the master socket. Diode D7 carries the current all the way in which through negative 1 of 2 cycles. Capacitor C3, in series with diode D3, is hooked up throughout the diode mixture of D4 thru D6, along with diode D7 in addition to resistor R10. Thus current pulses all the highest way thru constructive 1 of 2-cycles, charge up the capacitor to 1.8 volts by implys of diode D3.
This voltage is enough to carry transistor T2 in forward biased situation for about 200 ms even after the controlling load on the grasp socket is swaped off. When transistor T2 is ‘on’, transistor T1 gets ahead biased and that is swaped on. This, in turn, triggers Triac 1, which then energys the slave hundreds. Capacitor C4 and resistor R9 kind a snubber community to ensure that the triac flips off cleanly with an inductive load.
Mains Manager Circuit Diagram
LED1 point outs that the unit is working. Capacitor C1 and zener ZD1 are successfully in collection across the principles. The resulting 15V pulses across ZD1 are rectified through diode D2 and smoothened via capacitor C2 to present the essential DC provide for the circuit round transistors T1 and T2. Resistor R3 is used to restrict the changeing-on surge current, while resistor R1 serves as a bleeder for unexpectedly discharging capacitor C1 when the unit is unplugged. LED1 glows whenever the unit is plugged into the primarys. Diode D1, in anti-parallel to LED1, carries the current throughout the opposite half of cycles. Don’t plug the rest into the grasp or slave sockets with out testing the unit.
If that that you may simply assume of, plug the unit into the principles via an earth leakage circuit breaker. The mains LED1 will have to glow and the slave LED2 must stay off. Now join a desk lamp to the grasp socket and switch it ‘on’. The lamp should operate as common. The slave LED must flip ‘on’ each time the lamp plugged into slave socket is changeed on. Both lamps should be at full brightness with none flicker. If so, the unit is working appropriately and may additionally be put into use.
Note:
- The device linked to the master socket should have its energy swap on the first facet of the inner transformer. Some electronic tools have the ability swap on the secondary facet and hence these softwares continue to draw a small present from the primarys even when swaped off. Thus such instruments, if connected because the master, is no longer going to control the slave devices appropriately.
- Though this unit put offs the energy from the tools being keep a watch onled, it doesn’t provide isolation from the primarys. So, before working inside any equipment related to this unit, it should be unplugged from the socket.
http://www.ecircuitslab.com/2011/05/mains-manager.html
