2results about How to "Avoid harmonic interference" patented technology

The invention discloses a power supply circuit, a power supply method and a power supply system of a refrigerator car, and relates to the field of power supplies. If alternating current output by an alternating current power supply is received, direct current obtained by rectifying the alternating current through a rectifying circuit is used for supplying power to target equipment; and when no alternating current output by the alternating current power supply exists, the original power supply of the target equipment is used for supplying power. Meanwhile, the alternating current power supply is input into the rectifying circuit after passing through the reactor, so that harmonic interference in a power grid can be effectively avoided, stable operation of target equipment is facilitated, and the utilization rate of electric energy is improved; the original power supply serves as the main power supply, the alternating current output by the alternating current power supply serves as the standby power supply, automatic switching of the main power mode and the standby power mode is achieved, and the new energy refrigerator car can directly use the mains supply to supply power to the refrigerating unit under the condition that the mains supply is connected. The situation that the original power supply of the new energy refrigerator car needs to supply power to the refrigerating unit while being charged is avoided, and the charging rate of the original power supply in the new energy refrigerator car is increased.

This application discloses a control method and related apparatus for a charging and discharging system, relating to the technical field of new energy vehicles. The charging and discharging system includes a charging pile circuit and an on-board charger. The charging pile circuit is used to connect to an external power grid, and the on-board charger is used to connect to a battery. The control method includes: when the on-board charger and the charging pile circuit are electrically connected, determining a target operating mode; if the current mode is determined to be AC ​​charging, controlling the charging pile circuit to draw power from the external power grid and transmit AC power to the on-board charger, so that the on-board charger converts the received AC power into DC power according to a drive signal and outputs it to the battery; if the current mode is determined to be DC discharging, controlling the on-board charger to be in a direct-on state, so that the DC power output from the battery is output to the charging pile circuit via the on-board charger, and then controlling the charging pile circuit to transmit the received DC power to the external power grid. This application can reduce the discharge load on the power grid during peak electricity consumption periods.