Inverter, inverter circuit and construction method of inverter circuit
An inverter circuit, inverter technology, applied in electrical components, conversion of AC power input to DC power output, automatic power control, etc., can solve problems such as increased loss of switching devices
Inactive Publication Date: 2020-07-24
HUNAN UNIV
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Problems solved by technology
[0005] The purpose of this application is to provide an inverter, an inverter circuit and its construction method to solve the problem that the frequency of the sinusoidal alternating current output by the inverter in the related art is limited by the switching frequency of the switching device and the frequency increase of the switching device will cause The problem of increased switching device losses
Method used
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Embodiment
[0073] see Figure 4 , Figure 4 It is a structural schematic diagram of an inverter circuit provided by an embodiment of the present application.
[0074] Such as Figure 4 As shown, an inverter circuit provided in this embodiment includes: a connected inverter circuit 41 and a frequency division circuit 42;
[0075] The inverter circuit 41 is used to convert the input direct current dc into a step wave wave1 by controlling the switch device and output it to the frequency division circuit; the step wave includes a plurality of sine waves with different frequencies, and the frequency of each sine wave is the switching frequency of the switch device multiples of
[0076] Frequency division circuit 42, used to filter out the sine wave contained in the step wave that does not meet the target frequency, and extract the sine wave wave2 contained in the step wave that meets the target frequency as the output alternating current;
[0077] The switching frequency of the switching ...
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The invention discloses an inverter, an inverter circuit and a construction method of the inverter circuit. The inverter circuit comprises: an inversion circuit and a frequency dividing circuit whichare connected with each other, wherein the inversion circuit is used for converting input direct current into step waves by controlling a switching device and outputting the step waves to the frequency dividing circuit, the step waves comprise a plurality of sine waves with different frequencies, the frequency of each sine wave is the multiple of the switching frequency of the switching device, the frequency division circuit is used for filtering out the sine waves which do not accord with a target frequency and are contained in the step waves, and extracting the sine waves which accord with the target frequency and are contained in the step waves as output alternating current, the switching frequency of the switching device is 1 / N of the target frequency, and N is a positive integer greater than 1. According to the invention, a high alternating current frequency can be obtained through a low switching frequency; and compared with the prior art, the restriction of the highest switchingfrequency of the switching device is broken through, and the loss of the switching device is reduced.
Description
technical field [0001] The present application relates to the technical field of inverters, in particular to an inverter, an inverter circuit and a construction method thereof. Background technique [0002] An inverter is a converter that converts input direct current into alternating current. [0003] In the related art, the inverter mainly uses sinusoidal pulse width modulation (Sinusoidal Pulse Width Modulation, SPWM) based on the principle of pulse equivalent to realize the conversion from direct current to alternating current. SPWM is a PWM waveform that uses the pulse width to change according to the sine law and is equivalent to a sine wave, that is, the SPWM waveform, which controls the on-off of the switching device in the inverter, so that the area of the output pulse voltage is in line with the desired output sine wave. The areas in the corresponding intervals are equal, and by changing the frequency and amplitude of the modulation wave, the frequency and ampli...
Claims
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IPC IPC(8): H02M7/5387H03L7/18
CPCH02M7/5387H03L7/18
Inventor 汪洪亮邱晓东岳秀梅罗安
Owner HUNAN UNIV