| 摘要 |
A power supplying loop is comprised of a load assembly, which is included at least one load R and a normal-closed switch K in parallel with it, and a capacitor C connected the load assembly in series so as to supply power to the load R when open the switch K. This power supplying loop has the feature of supplying quasi-constant current or quasi-constant voltage, that is, for maintaining varying magnitude of the current through the load or the voltage across the load not exceeding predetermined percentage. The apparatus or method of the invention supplies power with simple structre, no harmonic pollution. It reduces loss and gain multiple functions with lower cost, these functions include short circuit or overload protection; running low-voltage electric appliances on high-voltage electric network; preventing impacting current from damaging electric applications and extending the lifetime of them; compensating a power factor for electric network in situ; turning on/off loads without sparking to ensure safety and blast-prool etc.
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