3 results about "Power modulation" patented technology

The invention relates to electronic circuit technologies, in particular to a frequency modulation method for a full-bridge inverter circuit. According to the frequency modulation method for the full-bridge inverter circuit, a reverse conducting type IGBT switching tube S1, a reverse conducting type IGBT switching tube S2, a reverse conducting type IGBT switching tube S3 and a reverse conducting type IGBT switching tube S4 are used for forming the full-bridge inverter circuit, a full-bridge modulation mode is adopted when the output power of the full-bridge inverter circuit ranges from 56% to 100%, an asymmetric frequency modulation mode is adopted when the output power of the full-bridge inverter circuit ranges from 25% to 56%, a half-bridge modulation mode is adopted when the output power of the full-bridge inverter circuit is smaller than 25%. The frequency modulation method for the full-bridge inverter circuit has the advantages that through a segmented power modulation mode, the power factor and efficiency of devices are greatly improved. The frequency modulation method is especially applicable to full-bridge inverter circuit frequency modulation.

The invention belongs to the technical field of an electric system and electric system automation, and provides a voltage control method based on direct current power modulation. The method comprises the main steps of: (1) confirming to-be-controlled nodes and direct current involved in the voltage control; (2) confirming a voltage control zone curve of the controlled nodes; (3) setting a voltage control target value; (4) actually measuring the voltage of the controlled nodes; (4) comparing a voltage track of the nodes with the voltage control zone curve; and trigging the voltage control in case of meeting the conditions; (5) calculating the voltage offset value of the controlled nodes; (6) calculating the sensitivity of the direct current power changes in response to the voltage changes of the controlled nodes to form a sensitivity matrix; and (7) calculating and optimizing a control strategy based on a target of minimum direct current power adjustment amount.