Frequency doubling single-resistor current sampling method and device
A current sampling and single-resistor technology, applied in the field of single-resistor current sampling, can solve the problem of low sampling accuracy of current signals, and achieve the effect of improving the accuracy of current sampling
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[0016] Please refer to figure 1 . According to the frequency-multiplied single-resistor current sampling method of the embodiment of the present invention, sampling the bus current through the sampling resistor set on the bus of the three-phase inverter circuit includes the following steps:
[0017] a. Adjust the three-phase duty cycle D[a], D[b], and D[c] calculated by the PWM control algorithm, and obtain the adjusted three-phase duty cycle as D 1 [a], D 1 [b], D 1 [c], and D 2 [a], D 2 [b], D 2 [c]; where D 1 [a], D 1 [b], D 1 [c] is the three-phase duty cycle of one of the first half cycle or the second half cycle of the carrier cycle, D 2 [a], D 2 [b], D 2 [c] is the other three-phase duty cycle of the first half cycle or the second half cycle of the carrier cycle;
[0018] b. Calculate the current sampling time t according to the adjusted three-phase duty ratio s1 , t s2 , t s3 and t s4 ;
[0019] c. Output the three-phase voltage according to the adjust...
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