| 摘要 |
FIELD: electricity. ^ SUBSTANCE: input voltage and current of single-phase circuit are measured, voltage signal is multiplied by control signal and compared to signal of circuit current sensor. Produced difference signal is used to control pulse-width modulator of power channel of conditioner. Power channel of conditioner is two-cycle inverter with bipolar supply, which is connected to electric circuit in parallel between primary source of voltage and load. The first output of inverter is connected to phase conductor of circuit in point between current sensor and load. Other output of inverter is connected to neutral line. Between point of connection of inverter with phase conductor and load, the second current sensor is connected (circuit of positive feedback by load current), output signal of which is rectified and integrated and then used for multiplication by signal of circuit voltage. Result of multiplication is compared to signal of the first current sensor (negative feedback), and produced difference signal is used to control pulse-width modulator, generating two control signals for pulse switches of inverter in antiphase. Each of switches commutes voltage of appropriate polarity to load, which is then filtered with the help of L-shaped filter. Maximum output current of inverter is limited by limitation of instantaneous value of current of each inverter switch. Initial value of efficient value of output current of conditioner is specified by setting a division ratio for value of voltage sensor output signal. Conditioner is supplied from the same circuit, connecting it to points of phase conductor and neutral line or from other circuit. ^ EFFECT: improved efficiency and electromagnetic compatibility of power conversion by recovery of circuit current form to form of voltage. ^ 3 cl, 3 dwg |
