Electricity: single generator systems – Combined control of generating means and load circuit – Including load circuit-making and breaking
Patent
1986-08-07
1988-06-07
Beha, Jr., William H.
Electricity: single generator systems
Combined control of generating means and load circuit
Including load circuit-making and breaking
219133, 307 10R, 307 16, 322 90, 363 36, 363129, H02P 1316, H02M 7155
Patent
active
047499354
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
The present invention relates to a regulated chopped DC power supply apparatus.
FIELD OF THE INVENTION
It is generally known that a vehicular alternator can be made with windings suitable to produce a power output capable of operating arc welding equipment. However, the current available from such windings is usually restricted by the size of the windings and the available space within a housing of the alternator and the battery potential used to excite a stator field winding of the alternator.
It is also generally known that certain AC powered appliances may be operated from DC power. However, switches used in AC appliances are usually not capable of switching DC power used to supply the AC appliance. Generally, if AC appliances are operated from DC power the switches in the appliances are quickly destroyed by arcing produced as the switch is operated. The destruction of AC switches by DC power is particularly prevalent where the AC appliance represents an inductive load to the supply of DC power.
SUMMARY OF THE INVENTION
The present invention provides a power supply apparatus which produces a relatively larger power output for a given size of winding and battery potential.
Also the present invention provides a regulated chopped DC power supply which results in substantially no arcing when loads are applied and/or removed from it.
In accordance with one aspect of the present invention there is provided a regulated chopped DC power supply apparatus characterised in that it comprises an alternator with a stator and a rotor, the alternator being wired to give a low voltage output and a high voltage output, a control means to commutate a rectifier means arranged to rectify the high voltage output from a high voltage winding of the alternator to produce a substantially direct current output at the high voltage output, wherein the high voltage direct current output is arranged to be interrupted periodically.
In accordance with a further aspect of the present invention there is provided a power supply apparatus, characterised in that it comprises an alternator with a stator and a rotor, the alternator being wired to comprise a star configuration winding arranged to give a low voltage output, the stator comprising a field winding arranged to be excited by power derived from a star point of the low voltage output star configuration winding.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will now be described by way of example with reference to the accompanying drawings which constitute a circuit diagram of a regulated chopped DC power supply apparatus in accordance with the present invention, and in which:
FIG. 1 is a circuit diagram of a rectifier means and a supply of power of the regulated chopped DC power supply apparatus of the present invention;
FIG. 2 is a circuit diagram of a control means of the regulated chopped DC power supply apparatus of the present invention; and
FIG. 3 is a circuit diagram of a regulator means of the regulated chopped DC power supply apparatus of the present invention.
DESCRIPTION OF THE INVENTION
In the drawings there is shown a regulated chopped DC power supply apparatus comprising a rectifier means 12, a control means 14 and a regulator means 15. The rectifier means 12 comprises a conventional full wave high voltage bridge rectifier having half of the rectifier diodes replaced by a retriggerable switch means such as SCR's 16, 18 and 20 (silicon controlled rectifiers).
The rectifier means 12 has a three phase input comprising phase inputs .phi..sub.1 .phi..sub.2 and .phi..sub.3. The inputs .phi..sub.1, .phi..sub.2, and .phi..sub.3 are from a high voltage winding 21 of an alternator 23 in accordance with the present invention.
The SCR's 16, 18 and 20 are arranged in the rectifier means 12 to switch each of the phase inputs .phi..sub.1, .phi..sub.2 and .phi..sub.3 respectively.
Each of the SCR's 16, 18 and 20 has a gate terminal, respectively assigned reference numerals 22, 24 and 26. Each of the gate terminals 22, 24 and 26 is biased by a voltage d
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Beha Jr. William H.
Unipower International Pty. Ltd.
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