| 摘要 |
A power supply comprising a DC input 46, a plurality of batteries 22, a DC output 54 and switch gear for operatively connecting the DC input 46, to the plurality of the batteries 22 in parallel; or for operatively connecting the DC input 46 to the plurality of the batteries 22 in series to the DC output 46. The DC input preferably comprises a 12V DC power supply, such as four 12V batteries connectable in parallel to a 12V DC input and in series to a 48V DC output. Alternatively the batteries may comprise a first plurality of batteries connected in series, and connected in parallel with a second plurality of batteries connected in series. Similarly the first plurality of batteries may be connected in parallel, but connected in series with a second plurality of batteries connected in parallel. The power supply may further comprise a means for detecting the voltage at the DC input and for detecting the demand or load at the DC output. The switch gear may comprise electromechanical switches, such as relays 52, which may be controlled by a PLC (programmable logic controller). The invention may be suitable for use in conjunction with a fluid compressor (figure 1) such as an air compressor (16, figure 1) for inflating vehicle tyres.
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