Water heater transformers are widely used, but when the transformer works, it will produce different temperatures. Don't underestimate this temperature, it's exquisite. And with the daily work of the transformer, if the temperature is too high, it will be harmful to the transformer core, which will affect the combustion of the transformer core to a certain extent, but if the temperature is too low, the power output The transformer will also show a lower voltage. Therefore, everyone must control this temperature. How to control the temperature of the transformer?
First of all, how is the current of the equipment transformer loaded?
1.Accurate load current balancing of parallel basic units is provided by additionalPWMCorrection control. through synchronizationPWMrunning multiple units in parallel and using otherPWMcontrol to eliminate circulating current. Each base unit uses electrical load isolation. Each basic unit has its own controller, which supplies power to the load through insulated windings.
2. PWMis an independent, non-synchronous, free-running signal, and each base unit has its own independent DC link. On the grid side, each basic unit has its own sineLCFilter. If the outputs are also electrically isolated, there is no circulating current between the different DC buses.
3.This is the easiest way to connect a standard standalone base unit in parallel with a standard standalone controller. A simple design based on electrical isolation on the generator side is shown. Three parallel, independent four-quadrant drives with discrete motor windings. The driver can be operated in parallel with one or both drivers.
Secondly, how does the temperature of the transformer control system of household appliances change?
1.The whole system consists of the controller and itsPWMSignal control. All three-phase transformers are connected to the common DC bus voltage. For each independent base unit driver, the parallel connection is implemented using a driver parallel board. Small changes in the working time of the drive (less100ns) Can be passed through a smaller AC output choke (inductance<5μH) to compensate.
2.All three-phase transformers work at the same time, but the delay is small, which can be compensated by additional AC reactors.IGBTThe symmetrical layout of the saturation voltage drop and the positive temperature coefficient are used to ensure proper load current balancing. Each basic unit of the system is accompaniedPWMAdditional correction of the signal.