Drive carrier frequency control method, device and drive for effectively reducing interference
A technology of carrier frequency and control method, which is applied in the field of drivers, can solve problems such as carrier electromagnetic interference, achieve the effects of reducing interference, reducing interference spectrum energy, and solving serious electromagnetic interference
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Embodiment 1
[0024] attached figure 1 It shows the basic principle of SPWM. In order to obtain the set modulated sine wave, it is realized by using pulses with equal impulse. The effect of the area of the impulse narrow pulse is the same as that of the modulation waveform, that is, the principle of area equivalent, such as figure 1 shown. In the process, it is necessary to introduce a fixed frequency carrier, the frequency is 1 / T0, compare the amplitude of the carrier and the modulation wave, if the modulation system is greater than the carrier, Vge is greater than 0, the switching tube is turned on; the modulation system is smaller than the carrier, Vge is equal to 0, the switching tube is off.
[0025] In SPWM technology, the interference signal comes from the turn-on Tr and turn-off Tf of the switch tube, and appears at intervals with the carrier cycle. The interfering signal will be repeatedly superimposed on the carrier cycle, thus causing the amplitude of the interfering signal ...
Embodiment 2
[0049] Based on the method for controlling the carrier frequency of the driver provided in the above embodiment 1, a device for controlling the carrier frequency of the driver is also provided in the preferred embodiment 2 of the present invention, specifically, Figure 4 shows an optional structural block diagram of the device, such as Figure 4 As shown, the device includes:
[0050] An acquisition module 402, configured to acquire an available carrier frequency;
[0051] The determination module 404 is connected to the acquisition module 402, and is used to determine the carrier frequency sequence used in each carrier frequency change period; wherein the carrier frequency sequence includes one or more carrier frequencies in the available carrier frequencies;
[0052] The control module 406 is connected with the determination module 404 and is used for controlling the operation of the driver according to the corresponding carrier frequency sequence in each carrier frequency...
Embodiment 3
[0061] Based on the device for controlling the carrier frequency of the driver provided in the above-mentioned embodiment 2, a driver is further provided in the preferred embodiment 3 of the present invention, including the device for controlling the carrier frequency of the driver as described above.
[0062] In the above embodiment, a driver carrier frequency control scheme that effectively reduces interference is provided, and a carrier frequency sequence is determined in each carrier frequency change cycle, so that the carrier frequency is constantly changing, thereby effectively avoiding some specific frequencies from being too concentrated In the field, the peak value of the interference spectrum is too high, which effectively solves the problem of serious electromagnetic interference of the fixed-frequency carrier in the prior art, effectively reduces the energy of the interference spectrum, and improves the effect of electromagnetic compatibility.
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