hey guys, i need some help. i need a blinker LED scheme. but scheme parameters must be high as 220V and current is high at least 5 A. is there any way to solve this problem?
Hello dodgydave, i have 220V DC power supply. it is supplied by batteries. so i need blinker for Automatic transfer switch signal. if Automatic transfer switch worked, led ,must be blinking. problem is our circuit load is very high. blinker circuit must withstand least 5A there is any way to solve this problem buddy?do you have a dc power supply, also what is the blinker for?
it needs for transfer switches signal. if it is worked led will blink. just what details do you need?feed us more details..
we are starving here...
schematic?
led specs Vf/current?
etc...
LED Specs? (Vf and rated current mostly)it needs for transfer switches signal. if it is worked led will blink. just what details do you need?
If you can find a scrap TV with a flyback SMPSU (old CRT type) the MOSFET is probably rated 600V 6A - as long as its switched between fully on and fully off (no linear region dissipation) and has a decent heatsink, you should be able to do that.Hello dodgydave, i have 220V DC power supply. it is supplied by batteries. so i need blinker for Automatic transfer switch signal. if Automatic transfer switch worked, led ,must be blinking. problem is our circuit load is very high. blinker circuit must withstand least 5A there is any way to solve this problem buddy?
I am taking it that all you really need is a indicator LED to blink not the whole power supply load.Hello dodgydave, i have 220V DC power supply. it is supplied by batteries. so i need blinker for Automatic transfer switch signal. if Automatic transfer switch worked, led ,must be blinking. problem is our circuit load is very high. blinker circuit must withstand least 5A there is any way to solve this problem buddy?
Actually - come to think of it: A typical flat screen TV or monitor will probably have a half-bridge SMPSU, The MOSFETs will probably only be rated at 500V, but that won't be a problem with a 250V battery supply. Probably depends on screen size, but I'd expect the MOSFETs to be at least 6A.If you can find a scrap TV with a flyback SMPSU (old CRT type) the MOSFET is probably rated 600V 6A - as long as its switched between fully on and fully off (no linear region dissipation) and has a decent heatsink, you should be able to do that.
Also CRT PC monitors, anything over 15" should have an adequately rated MOSFET - some of the bigger monitors have a chunky TO3P rated upto 900V and 8 or 9A.
Shouldn't be any difficulty driving the MOSFET with a simple 555 pulse generator - but do look at the MOSFET datasheet and confirm how much gate voltage is required to achieve the headline RDSon/Id-max. You probably need to aim in the general direction of 8 - 10V, most MOSFETS have a maximum gate voltage around 18 - 20V - anything over that and the life expectancy takes a hit.
it is an inter sectional transfer switch. For example if sectional power supply damaged or fallen, reserve power supply must be switched on. then if transfer switch worked LED must blinking and give us signal. our signal system works on 220 or 110 V DC power supply. then signal load is too high as 5 A least. i ll sent you schematic soon.like what is a transfer switch?, have you got pictures!
Slowly we're getting there (I think) . Do you already have a signal to control the transfer switch to cause it to operate? We really do need a schematic of the system, to put an end to this guessing game.it is an inter sectional transfer switch. For example if sectional power supply damaged or fallen, reserve power supply must be switched on.
If you simply want a current draw indicator at around 5A-ish, you can put a series chain of power rectifiers in series with the load to provide a clamped volt-drop to feed an indicator LED. Obviously the rectifiers must handle the maximum current draw with a decent safety margin. About 3 series silicon junctions will do for a red LED Vf, you can adjust the number of junctions to suit the LED type, its not a bad idea to include a safety resistor in series with the LED to absorb any spikes; about 33 - 56R should do. You can get blinking LEDs with a built in flasher chip, but they need at least 5V - quite a few Si junction forward drops to get enough!it is an inter sectional transfer switch. For example if sectional power supply damaged or fallen, reserve power supply must be switched on. then if transfer switch worked LED must blinking and give us signal. our signal system works on 220 or 110 V DC power supply. then signal load is too high as 5 A least. i ll sent you schematic soon.
by Jake Hertz
by Jake Hertz
by Jake Hertz