Device for measuring reflecting voltage of transformer

The utility model provides a voltage-reflecting device to measure transformers. Through orderly sampling of the reflecting voltage of transformers, multiple sampling signals can be used to produce a plurality of maintaining voltages. A buffering electric circuit can produce a buffering signal from the relatively higher voltage of the plurality of the maintaining voltages. A sampling switch can produce feedback signal from the exporting periodical buffering signal. The feedback signal is in proportion to the output voltage of the transformer. A reflecting voltage signal plus a threshold signal can produce an offset signal of electricity level. Once the switch signal is forbidden, the signal for discharging time is turned on. Once the offset signal of electricity level is lower than the export of the buffering electric circuit, the signal for discharging time is forbidden. The impulse width of the signal for discharging time is related to the discharging time of the transformer. When the signal for discharging time is in use, a plurality of sampling signals are turned on for producing multiple maintaining voltages.