Electric power conversion systems – Current conversion – With voltage multiplication means
Patent
1984-11-01
1986-07-08
Salce, Patrick R.
Electric power conversion systems
Current conversion
With voltage multiplication means
363 37, 320 1, H02M 702
Patent
active
045996873
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an electrical power supply and particularly to an electrical power supply which is adapted to be connected to the electrical system of a motor vehicle.
It has heretofore been known to employ an electrical power supply on a motor vehicle in conjunction with the conventional electrical system thereof, to provide a power source for the operation of extaneous electrical appliances characterized by requiring a higher or an alternative source of power than that provided by the conventional system.
Indicative of prior art systems of this kind are U.S. Pat. Nos. 3,456,119, 3,614,459, 3,676,694, 4,100,474, 4,214,198 and U.K. Pat. No. 2071367.
As can be readily appreciated from the foregoing devices, the voltage output of an electrical power supply derived from the alternator of a motor vehicle can be controlled in several ways. Firstly, as there is a directly proportional relationship between the angular speed of the rotor field winding of the alternator and the generated e.m.f., the speed of the rotor can be increased or decreased by directly controlling the idling r.p.m. of the vehicle. Accordingly such control is normally provided by adjusting the vehicle throttle until the desired level of output voltage is attained. As exemplified by the prior art, many elaborate electro-mechanical devices have been devised which utilize this technique, however, the cumbersome and complex nature of such devices has always been a major drawback in their implementation.
A second technique utilizes the proportional relationship between the field winding current and the generated e.m.f., whereby the output voltage of the alternator may be increased by correspondingly increasing the current in the field winding thereof. This popular technique usually employs a regulator which controls the current supplied to the field winding by feedback in accordance with the load demands on the system. A problem with this technique resides in the difficulty of providing sufficient power for appliances which operate at a rated high voltage such as 240 volts and, in addition to which, draw high current.
It is an object of this invention to provide an improved electrical power supply which employs circuit means to supply power to an external load which has a relatively high power demand.
In one form the invention resides in an electrical power supply comprising a first input adapted to be connected to an essentially direct current (D.C.) voltage source, a second input adapted to be connected to an essentially alternating current (A.C.) voltage source, a capacitor bridge circuit including an input capacitor, an output capacitor in parallel with said input capacitor, and diodes, and an output connected across said output capacitor; wherein said first input is provided across the capacitor bridge circuit, said diodes are biased to oppose discharge current flow from said capacitors to said first input, and said second input is provided in series with said input capacitor such that the effective charge stored in the input capacitor in conjunction with the A.C. voltage to be applied to the second input raise the effective level of charge stored in the output capacitor to provide a higher level of D.C. voltage at the said output.
According to a preferred feature of the invention the capacitor bridge circuit includes a pair of serially connected input capacitors, a first junction between the input capacitors, a pair of serially connected output capacitors and a second junction between the output capacitors, whereby said second input is provided across said first and second junctions, such that both positive and negative cycles of the A.C. voltage to be applied thereto in conjunction with the charge stored in said input capacitors may be alternatively applied to the corresponding output capacitors.
According to another preferred feature, the capacitor bridge circuit includes a plurality of input capacitors or input capacitor pairs in parallel, having respective second inputs connected respectively in series therewith or across said
REFERENCES:
patent: 3259830 (1966-07-01), jelid
patent: 3456119 (1967-07-01), Schneider
patent: 3614459 (1971-10-01), Watson
patent: 3676694 (1972-07-01), Schneider et al.
patent: 3723850 (1973-03-01), Daniels et al.
patent: 3731179 (1973-05-01), Rademaker
patent: 3911292 (1975-10-01), Petrick et al.
patent: 3943428 (1976-03-01), Whidden
patent: 4100474 (1978-07-01), Pfeffer et al.
patent: 4214198 (1980-07-01), Schneider
Ault Anita M.
Ayr Pty. Ltd.
Salce Patrick R.
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