how do dc-dc converters work?
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Generally you take the starting DC voltage, modulate it into a square wave by "switching" it with a pulse width modulation circuit, then pass it through a high frequency transformer.  This will allow you to increase or decrease the voltage level.  After that, you pass it through another circuit to rectify it back to DC again.  This can be either a standard type of rectifier, or another PWM system if you need higher precision control.
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Power electronics is the technology associated with the efficient conversion, control and conditioning of electric power by static means from its available input form into the desired electrical output form.
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Here is a place to start but the best place is a good library. Many great books have been written by drive engineers with different approaches to old problems. http://www.joliettech.com/dc_drives_principles_of_operatrion.htm\n\nAs you probably know dual converter drives are simply 4 quadrant drives capable of controlling hauling and overhauling loads in both directions of rotation. \nThe latest technology in Thyristor drives uses what is called a 12 pulse system that creates an output the equivalent of six separate phases. It boasts operation as quiet as a 12 SCR dual converter system without the use of a ripple filter in the armature circuit. It uses a combination of 17 high power diodes and SCR's along with a multiple winding transformer in the output.
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DC generator would have a rectifier built in to convert the AC to DC.
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Here are some sites that may help.  Both have circuit examples utilizing LVDT's.  Hope this helps.
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AC (alternating current) can be transformed into a DC (direct current) by means of a rectifier or bridge rectifier circuit depending on the AC circuit.\n\nA single AC line to ground or common an be rectified by the use of a single diode. This is a crude dc circuit.\n\nUsing a dual AC line, not grounded, where there are two lines, both above ground, then a full wave bridge rectifier can be used. Four diodes are used which rectify both the positive half as well as the negative half of the AC waveform.\n\nThen there is the 3phase rectifier bridge which uses 6 diodes, converting 3 AC lines, they are 120^deg outof phase of each other. Most industrial machines are using 3 phase power.\n\nMachines using this 3 phase power usually have a Motor Control Center which house a AC Drive (AC to DC to AC) inverter. This drive uses devices called IGBT which are active diode devices providing controlled amounts of power at variable frequency to run a machine.\n\nTo smooth out the DC waveform a capacitor bank is attached to the output of the DC bridge rectifier. \n\nAs you drive by an industrial park you will notice three power lines usually connected to each building. This is the 3 phase power. \n\nLarge Hybrid electric vehicles use such machines.
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Capacitors are built with a gap between the two conductors, or sides of the component.  So it is not completely accurate to say that they block direct current, because enough direct current applied to one side will jump the gap (think of a spark plug).\n\nHowever, applied in a circuit correctly, that is why it is said they block dc current.  Make sense?
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Inverter: DC to AC\n\nRectifier: AC to DC.\n\nthey do opposite functions.
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Hope you find this helpful read through it its pretty basic but it will a good idea of how they work\n\nhttp://www.howstuffworks.com/fuel-cell.htm
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Try these sites. Some have better explanations than others.\n\nSwitching and inverters: http://www.kpsec.freeuk.com/trancirc.htm\nAmplifiers: http://www.tpub.com/neets/book7/25c.htm\nLogic gates: http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/trangate.html
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Are you trying to convert AC to DC?  If it is, you want to use a rectifier.
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your question is not clear enough to answer. do you need to plug them in now? in which case you need any power converter that fits them. if you want to make them portable, that's a different problem.
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what is your question?\n\nA 220 Volt Circuit works the same as any other voltage.  Voltage pushes electrons and work is done.
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An automobile has a DC (direct current) battery and therefore uses a DC starter.  Current flows in only one direction just as in a flashlight with batteries.\n\nMany snowblowers can be plugged into an AC (alternating current) outlet in the garage and use AC starters.  Current flows in opposite directions through the starter completing 60 cycles every second.  The voltage rises from zero to a peak drops to zero and continues to a negative peak before returning back to zero once each cycle.  The graph of voltage with respect to time forms a sinusoid.
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dc is direct current. ac is alternating current.\nac current's voltage varies constantly in a sinusoidal manner, while DC has a constant, flat-line voltage
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AC & DC of the same voltage can push the same amount of current through a wire.  In regular use however, we never see them at the same voltage.  There is no DC power transmission, and no one makes AC batteries.\n\nYour portable stereo either has an adapter to lower the 120VAC house voltage & convert it to DC, or has circuitry to raise your 12VDC car voltage & convert it to AC.  The former is more likely.  Since homes have 120VAC power, most appliances that use lower voltage DC have adapters, either built-in or external.
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Hi! A transformer works on the principle of mutual induction which is valid only when the voltage (or EMF, to be more appropriate) on one of the coils of the transformer is changing with time, as in the case of A.C. voltage. As the magnitude of the voltage changes on one of the coils, the corresponding flux on the other coil also changes, thus giving rise to a voltage on the other side.\n\nAn AA battery provides a constant voltage, as a result of which there is no change in flux and no voltage on the other coil (120 V side, in this case).\n\nHowever, there will be a flux change for a very short duration of time as the current in the 24 V side rises from 0 to its full value after the battery has been connected. During this time, a voltage will be induced in the 120 V side and you'll get an A.C voltage on this side. But this would be for a very short time duration.\n\nSo, the answer: After some time, there is no voltage (A.C. or D.C.) on the 120 V side.