The concept of inverter comes from three-port and online interactive UPS. Because the separate input rectifier/charger has been eliminated in the structure of these UPSs. All functions of the rectifier/charger and inverter are completed by the bidirectional converter. #5000w off grid solar inverter The dashed box shown in Figure 11 is the electrical schematic diagram of the bidirectional converter constituting the three-port UPS. It can be seen from the figure that it is a common inverter bridge circuit structure used in all UPSs. #mppt hybrid solar inverters But the role here has given new meaning and functions. When the mains fails and the battery is discharged, the role of the bidirectional converter is the inverter. #soler inverter solar home system Its working process is exactly the same as that of other UPS inverters. The diode The function of VD1~VD4 is: when the power tube turns from on to off, there will be a back EMF on the transformer winding, and the diode is to discharge the back EMF back to the battery. For example, when V1 and V4 are turned on, the potential polarity of the winding AB of the transformer Tr is A"-", B"+", and the polarity of the back EMF excited in the winding becomes A" at the moment when V1 and V4 are turned off. +", B"-", this back EMF will affect the normal operation of the circuit and the safety of the device. However, due to the existence of diodes VD1~VD4, this potential can form a bleeder loop through A"+"→VD2→UB→VD3→B"-", and the energy stored in the winding is fed back to the battery, thus ensuring the next Cycles V2 and V3 are opened smoothly. The processes when V2 and V3 are turned on and off are exactly the same, and will not be repeated.

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