An apparatus for controlling a three-phase autonomous inverter using vector PWM

摘要

An apparatus for controlling a three-phase inverter using self vector PWM converter relates to the art and can be used for controlling the autonomous inverter voltage by "vector" PWM, which is realized by using digital technologies.; Target Utility Model - creating digital control device via PWM vector without using a microprocessor or digital signal processor with software instructions, and thereby, increase productivity, flexibility and reliability of the device while reducing the size and cost.; The claimed device for digital control of three-phase autonomous inverter via vector PWM at which the generated coefficients modulation, and digital defining coefficients phase scans PWM intervals on state of upper passive phases keys and give the coefficients of the phase sweeps PWM intervals energized state lower passive phases of keys, includes an analog-to-digital converter 8 adapted to convert the error voltage in the m-bit digital control code vyho dnymi linear voltage inverter (code modulation factor), the device for supplying control signals to the inverter keys, digital sawtooth sweep generator (TSGPR) 13, a comparator, and programmable logic circuits forming the control signals, implemented by programmable logic devices. The comparator is in the form 2n digital comparison circuit (SSC), ₁₁ January -11n, and January ₁₂ -12n setpoints which are 2n codes defining coefficients scans PWM active phases formed by the two groups of logic arrays, of which a first group of n logic arrays (for among the PWM intervals partition of an interval fundamental frequency) 9 ₁ -9n contains pre-computed values of the coefficients A phase _B phase PWM active scans at intervals - the output frequency of the on-state inverter row keys passive phases corresponding to each value of the m-bit ADC code and a second group of n logic arrays January ₁₀ -10n contains precalculated coefficient values A _N of sweeps of the phase PWM active phases at intervals (Output frequency) of the energized state of the lower keys passive phases of the inverter corresponding to each value of the m-bit ADC code. In the apparatus introduced serially connected high-frequency (HF) 17 and a low-frequency (LF) 19, shift registers, pulse distributor 18, and two logic devices 15 and 16, switching the resultant pulses of said SSC to respective inputs of pulses of RF shift register command distributor autonomous defining generator 14 and the external synchronization device 20 connected to TSGPR, as well as HF and LF shift registers. The outputs of these two logic arrays groups are connected to first inputs of SSC, the second inputs of which the signals with TSGPR receives and outputs SSC connected to the first inputs of the two logic units, the second inputs of which receives a sequence of pulses with high frequency shift register, the outputs of the two logic units connected to corresponding inputs of pulse distributor, the other inputs of which are connected to the outputs of the low shift register group 21, and through NAND gates - the three-phase inverter with the keys 1a and the output of the master autonomous n connected to a generator of TSGPR whose output is connected to the RF shift register.; The technical result of the decision is possible to realize the function of each of said devices except the device external clock and auxiliary oscillator, in a programmable logic integrated circuit, thus forming for PWM conversion coefficients phase sweep is not performed by calculating a function of a predetermined modulation factor, and using a pre-programmed logic arrays, thereby increasing the performance under the conditions in sokochastotnogo PWM conversion, and hence an adequate and quick reaction to closed systems disturbance, reduced distortion autonomous inverter output voltage.