Driver carrier frequency control method and device capable of effectively reducing interference and driver
A technology of carrier frequency and control method, which is applied in the field of drives, can solve problems such as carrier electromagnetic interference, achieve the effects of reducing interference, improving electromagnetic compatibility, and solving serious electromagnetic interference
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Embodiment 1
[0024] attached figure 1 The basic principle of SPWM is shown. In order to obtain a set modulation sine wave, pulses with equal impulses are used to achieve it. The area effect of the impulse narrow pulse is the same as that of the modulation waveform, that is, the area equivalent principle, 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 wave and the modulation wave, the modulation wave system is greater than the carrier wave, Vge is greater than 0, the switch tube is turned on; the wave modulation system is less than the carrier wave, Vge is equal to 0, the switch tube off.
[0025] In the SPWM technology, the interference signal comes from the turn-on Tr and turn-off Tf of the switch, and it appears at intervals from the carrier cycle. The interfering signal will be repeatedly superimposed with the carrier cycle, thus resulting in an excessively high amplitude on t...
Embodiment 2
[0049] Based on the driver carrier frequency control method provided in the above embodiment 1, a driver carrier frequency control device is also provided in a preferred embodiment 2 of the present invention, specifically, Figure 4 An optional structural block diagram of the device is shown, such as Figure 4 As shown, the device includes:
[0050] an obtaining module 402, used for obtaining an available carrier frequency;
[0051] A determination module 404, connected with the acquisition module 402, is used for determining the carrier frequency sequence adopted in each carrier frequency variation period; wherein, the carrier frequency sequence includes one or more carrier frequencies in the available carrier frequencies;
[0052] The control module 406, connected with the determination module 404, is configured to control the operation of the driver according to the corresponding carrier frequency sequence in each carrier frequency variation period.
[0053] In the above ...
Embodiment 3
[0061] Based on the device for controlling the carrier frequency of the driver provided in Embodiment 2 above, a preferred embodiment 3 of the present invention also provides a driver, 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 variation cycle, so that the carrier frequency is continuously changed, thereby effectively avoiding some specific frequencies 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 fixed-frequency carrier waves in the prior art, effectively reduces the energy of the interference spectrum, and improves the electromagnetic compatibility effect.
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