Shenyang Xinyuanweiye Science and Technology Co

. Shenyang prepaid electric meter magnetic card prepaid electric meter supply
.
. Prepaid single-phase electric energy meter
. It is used to measure power frequency AC single-phase electric energy and can realize power consumption. Pre-purchase electric energy meter with functions such as current-limiting protection and anti-stealing and creeping protection. It adopts large-scale application-specific integrated circuits and applies new technologies such as computer technology, surface mounting technology and electromagnetic compatibility technology. The circuit is highly integrated, has a reasonable structure, is reliable in performance and is suitable for industry. and civil circuits.
. Shenyang prepaid electric meter magnetic card prepaid electric meter supply
.
Introduction:
Prepaid single-phase electric energy meter is a new charging method. After the electric energy meter user pays the electricity bill, The electricity bill paid is credited to the electricity card. The electricity card is inserted into the energy meter and stored in the energy meter memory. When the user's electricity consumption reaches the allowable electricity consumption corresponding to the prepaid amount, the energy meter immediately cuts off the power supply. Therefore, the user must store the electricity bill. Pay the electricity bill again before the end so that the electricity will not be suddenly cut off.
The special electricity card can realize automatic alarm when the remaining power in the paid electricity meter is insufficient, automatic power-off when the remaining power is zero, and can realize programmable rated power limit. Automatic power-off alarm when the user load exceeds the rated power limit, etc. The unique confidentiality measures that can measure electric energy in both directions ensure the high security of users' electric energy meters and electric cards.
. Shenyang prepaid electric meter magnetic card prepaid electric meter supply
.
Working principle:
The current of the current loop is sampled by the shunt and the voltage signal obtained is then passed through the special integrated block D for electric energy. The digital signal from the digital phase correction, high-pass filter and /D converter enters one input of the digital multiplier.

The voltage signal of the voltage loop is sampled by the resistor divider and then enters the other input end of the digital multiplier through the digital signal obtained inside the power dedicated integrated block D.

The above two signals are multiplied by a digital multiplier to obtain the instantaneous power measurement of the measured electrical energy. The instantaneous power output by the multiplier is integrated through a low-pass filter and then enters the digital frequency converter to be converted into a frequency pulse signal proportional to the average power of the measured electric energy
The high-frequency pulse signal is output to the test pulse output and used To drive the pulse indicator light, the high-frequency pulse signal is output to the microprocessor interface to realize the measurement of electric energy. D can clearly display the electric energy value and its related contents. Electric energy can still be accurately measured when the power is reversed. The electricity sales department initializes the electricity card through the electricity sales management system and issues the electricity card to the user. At the same time, a file is created in the management system. The user must purchase electricity from the power supply department before using the electricity user's < br/> Rated
Power limits are set by the point of sale department.

-d:. The microcontroller can read the prepaid electricity card into the memory and then gradually deduct it during the electricity consumption process. When the electricity bill is used up, the power supply will be cut off through the microcontroller. The memory must use r so that the stored contents will not be lost due to power outage.