Plural inverter synchronizer and control apparatus
AssigneeKabushiki Kaisha Toshiba
InventorYoshiaki Miyazawa
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Abstract
An inverter control apparatus contains digital phase-locked loop oscillators, in order to achieve a synchronization with a reference frequency of a commercial power supply. The inverters are activated by outputs from programmable dividers for frequency-dividing the output pulses from the digital phase-locked loop oscillators. The frequency-dividing ratio of each of the programmable dividers is changed in accordance with the deviation of the active output powers of the inverters.
Claims9
A control apparatus for controlling an inverter circuit, so that the inverter circuit is operated in synchronism with a predetermined reference frequency, and in a parallel mode with respect to an other power supply, said control apparatus comprising:
- phase-locked loop means, coupled to said inverter circuit, for varying an output frequency of said inverter circuit, so that an output phase of said inverter circuit matches a phase of said predetermined reference frequency;
- first control means, coupled to said inverter circuit, for detecting an active power deviation between an output of said inverter circuit and that of said an other power;
- and
- programmable divider means, coupled to said control means, said phase-locked loop means, and said inverter circuit, for frequency-dividing an output of said phaselocked loop means with a ratio of the frequency dividing depending on said active power deviation is reduced, thereby controlling the share of active power between the output of said inverter circuit and that of said an other power supply.
Dependencies are inferred from the claim text.