A sine wave power supply and its method for satisfying frequent on-off of inductive loads

Abstract

The invention discloses a sine wave power source satisfying inductive load frequent connection and disconnection. The sine wave power source comprises a sine wave generating module, the sine wave signal conditioning circuit and a D type power amplifier circuit, a DDS numerical frequency compounding technology is adopted to generate a sine wave signal with a needed frequency, and the sine wave signal is sent to a sine wave signal conditioning circuit; the sine wave signal conditioning circuit removes a direct current component in the sine wave signal generated by the sine wave generating module, amplifies the amplitude value of the sine wave signal and conducts change to obtain two sets of sine wave signals of which the amplitude value is the same and the phase difference is 180 degrees, then two sets of sine wave signals are transferred to a subsequent first D type power amplifier circuit and second D type power amplifier circuit in sequence to be processed; the D type amplifier circuit is used for amplifying power, processing a signal of each of the two sets of sine wave signals of which the amplitude value is the same and the phase difference is 180 degrees and then transferringthe processed signal to a power source and an inductive load. Through the principle, the sine wave power source can be utilized in the environment in which it is required that the output load of the inductive load is large, and a sine wave power source is continuously connected and disconnected.

Description

technical field

[0001] The invention relates to a sine wave power supply, in particular to a sine wave power supply that satisfies the frequent on-off of inductive loads. Background technique

[0002] In the prior art, when a large inductive load is required to be frequently turned on and off in the application occasion, due to the existence of the inductive back electromotive force, the sine wave waveform output by the sine wave inverter power supply will be seriously distorted at the moment of turning off and on, making the conventional The sine wave inverter power supply cannot be used in this kind of environment. The output of the square wave inverter power supply contains a large number of high-order harmonics, which will generate additional losses in load appliances with iron core inductors or transformers, which will cause interference and damage to the equipment. However, high-end precision inductive equipment requires an inverter power supply with a sine wave power...

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