Double-tube independent interleaving control method for electromagnetic attraction suspension system
A control method and technology of electromagnetic attraction, applied in the direction of holding device with magnetic attraction or thrust, electric traction, electric vehicle, etc., to achieve the effect of increasing the number of adjustments, speeding up the response, and increasing the control and switching frequency
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Embodiment 1
[0017] The two switching tubes T1 and T3 are controlled with the same cycle and the same control algorithm. Assume that the switching periods of T1 and T3 are both T, but the turn-on time and the duty cycle are not consistent, and the difference between the turn-on time is t 3 , the duty cycle is d 1 and d 2 . where U i is the input voltage, i o is the output current, I 0 To output the DC component, the inductance of the current electromagnet is L and the resistance is R.
[0018] by attaching image 3 , we can see that in each switching cycle, there may be three levels of positive, zero and negative.
[0019] Table 1 Working status of the chopper (where 1 stands for on and 0 stands for off)
[0020]
negative level
Positive level
zero level
zero level
T1 state
0
1
1
0
T3 state
0
1
0
1
Conduction ratio
d -1
d 12
d 10
d 20
[0021] where d 12 Ind...
Embodiment 2
[0030] The two switching tubes T1 and T3 are controlled with the same period and different control algorithms, and the interleaving time of sampling and PWM implementation is fixed.
Embodiment 3
[0032] The two switching tubes T1 and T3 are controlled with different cycles and the same control algorithm, and the interleaving time of sampling and PWM implementation will show periodic changes.
[0033] The invention can be used in the current control link of the electromagnetic suction levitation system, for example, can be used in the current control of the magnetic levitation vehicle, which is beneficial to reducing the static disturbance of the system and increasing the system frequency equivalently.
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