Second Stage Joule Thief Circuits

[Thaelin]

   Just remember that using a SS Relay meant for AC,
you have to use AC. It will not shut off unless the zero
crossing happens. Made that mistake and it cost me 6
relays to find out. Still have them here some where.

thaelin

[innovation_station]

   Just remember that using a SS Relay meant for AC,
you have to use AC. It will not shut off unless the zero
crossing happens. Made that mistake and it cost me 6
relays to find out. Still have them here some where.

thaelin

thank you for the fore warning ...  i have not ran them ..  i may have to redesign a unit .. to allow for this .. hummmmm...  no problem ... it will just cost more ... but it wont blow up ... and still runn from a i cube unit ...   i will use a smal 12vdc to 110 ac sine wave invertor ..  then step it down through a variac... to 5 vac a few amps.. to power the big relays..  then indiviguall rectify them .. then 3 phase them on a core ... thease w material cores .. can handle a few amps i would think .. as a transformer .. i bet there is 1 heck of a flux made with a few amps ... 123 123 thats a lot of movement in the core ...

w

i can draw this if you like ...  basically a 3 phase reconnect transformer rotating about a w material core ..  it in my mind would be best to put the secondsries on the core first then wind over that the 3 5 turn primaries...  power this too from a jt power can if you want ... but you need the ac ... for the ss 3 phase relay ... so invertor and variac  inverter 75 watt 15 bucks .. and its small ...

[gravityblock]

Thank you for educating me on the Wiegan sensor . Do you have any idea what they are made of ? Something like a tape recorder head ? I know it senses minuet magnetic wires but its beyond me as to how one could apply this or what output the wiegan sensor  outputs .

The Wiegand effect is a nonlinear magnetic effect, produced in specially annealled and hardened wire called Wiegand wire.  In the Wiegand Sensor, the polarity will switch direction only after the magnetic field reaches a certain strength and a rapid magnetic field change will increase the output voltage by several orders of magnitude. 

Since the strength of the magnetic field is proportional to both the number of turns in the winding and the current in the wire, I assume the Wiegand Sensor can be made to switch polarity after reaching a certain voltage threshold, especially by varying the distance between an electromagnet and the sensor.  The output of the sensor will be either a negative or positive pulse according to the polarity of the magnetic field.  These pulses will let you know you've reached a certain voltage threshold and allow you to trigger other components in the one volt switching circuit according to the pulse itself or the polarity of the pulse.  The sensor won't send out another pulse until a magnetic field of the opposite polarity with a certain strength triggers the sensor again.  This pulse will be opposite in polarity to the previous pulse. 

There are two modes of magnetic excitation of the Wiegand effect, symmetric switching and asymmetric switching.  In the asymmetrical switching mode, the Wiegand wire is magnetized and triggered by magnetic fields of opposite polarity but unequal strength.  In symmetric switching, alternating positive and negative magnetic fields of equal strength are used to magnetize and trigger the Wiegand wire.  Below is two illustrations showing the different switching modes. 

We would probably use the asymmetrical switching mode for our task.  We would have 2 electromagnets placed at different distances from the sensor.  The electromagnet closer to the sensor can trigger the sensor at a lower voltage, and the electromagnet farther away can trigger the sensor after reaching a higher voltage.  Each electromagnet will be of opposite polarity but unequal strength.  With a little logic in the circuit, we can control the behavior according to the different polarity in the pulses we receive based on the voltage, assuming I have this all correct and I believe I do.

Heinrich Barkhausen discovered that a slow, smooth increase of a magnetic field applied to a piece of ferromagnetic material, such as iron, causes it to become magnetized, not continuously but in minute steps.  These magnetization jumps are interpreted as discrete changes in the size or rotation of ferromagnetic domains.

A coil of wire wound on the ferromagnetic material can demonstrate the sudden, discontinuous jumps in magnetization. The sudden transitions in the magnetization of the material produce current pulses in the coil.

The Wiegand effect is a macroscopic extension of the Barkhausen effect as the special treatment of the Wiegand wire causes the wire to act macroscopically as a single large magnetic domain.  The small high-coercivity domains in the Wiegand wire outer shell switch in an avalanche, generating the Wiegand effect's rapid magnetic field change.

Because the voltage induced by a changing magnetic field is proportional to the rate of change of the field, a Wiegand-wire core can increase the output voltage by several orders of magnitude as compared to a similar coil with a non-Wiegand core.

http://en.wikipedia.org/wiki/Wiegand_effect
http://en.wikipedia.org/wiki/Barkhausen_effect


GB

[gravityblock]

@gadgetmall:

Why can't an IC be used to generate a signal after reaching a maximum voltage and generate another signal after reaching a minimum voltage?

http://www.interfacebus.com/voltage_threshold.html

VCC: The voltage applied to the power pin(s). In most cases the voltage the device needs to operate at.

VIH: [Voltage Input High] The minimum positive voltage applied to the input which will be accepted by the device as a logic high.

VIL: [Voltage Input Low] The maximum positive voltage applied to the input which will be accepted by the device as a logic low.

VOL: [Voltage Output Low] The maximum positive voltage from an output which the device considers will be accepted as the maximum positive low level.

VOH: [Voltage Output High] The maximum positive voltage from an output which the device considers will be accepted as the minimum positive high level.

VT: [Threshold Voltage] The voltage applied to a device which is "transition-Operated", which cause the device to switch. May also be listed as a '+' or '-' value.

[gadgetmall]

@gadgetmall:

Why can't an IC be used to generate a signal after reaching a maximum voltage and generate another signal after reaching a minimum voltage?

http://www.interfacebus.com/voltage_threshold.html

VCC: The voltage applied to the power pin(s). In most cases the voltage the device needs to operate at.

VIH: [Voltage Input High] The minimum positive voltage applied to the input which will be accepted by the device as a logic high.

VIL: [Voltage Input Low] The maximum positive voltage applied to the input which will be accepted by the device as a logic low.

VOL: [Voltage Output Low] The maximum positive voltage from an output which the device considers will be accepted as the maximum positive low level.

VOH: [Voltage Output High] The maximum positive voltage from an output which the device considers will be accepted as the minimum positive high level.

VT: [Threshold Voltage] The voltage applied to a device which is "transition-Operated", which cause the device to switch. May also be listed as a '+' or '-' value.

Gravityblock , I believe this is where we are at the present . Alex(Groundloop) trying a comparator to do just that . the one parameter  is that the IC must operate at very volt voltages .1.4 and a bit higher . I don't want to take any power from the Bcap because the time it takes to charge up is long, and power everything circuit wise from the AA battery which can be replenishment once the BCap reaches over the unity of the battery . I have mentioned a tiny dc to dc step up converter that will step up 1,4 volts to 5.5 and Also maybe we could make another secondary and tap.rectify and filter that winding for the chip power . I have been working on a new coil to speed up the charging effect . I just got some big TIP3055's in yesterday  and see if i can boost  it up a bit higher.

Gadget