Accompanied
by the development of science and technology, the development of the
pre-paid meter based on the electronic meter has been very different
from that of the traditional meter.Professional
pre-paid electricity meters through the measurement of energy,
microprocessors and other parts of the work in the function of great
progress, more convenient to use, science, so how does the various parts
of the prepaid meter works?
1,The working principle of the energy metering section The
electric energy metering part of the prepaid meter uses the energy
metering module. The voltage divider is used to complete the voltage
sampling. The sampling resistor completes the current sampling. The
sampled voltage and current signals are converted into power signals by
the multiplier, How
many pulse series, among them the high-frequency electric energy pulse
represents the instantaneous active power, after the light couple is
isolated and exported, the light-emitting diode which is used as the
check pulse and the optical couple series can be used as the electric
energy to measure the indication. After sixteen frequency and drive to become low-frequency electrical
energy pulse, accumulate this pulse to calculate active energy for
energy measurement.
2, The microprocessor part of the working principle Users
pay the electricity supply department, the purchase of electricity is
written into the user IC card and then passed to the power meter through
the IC card interface and encrypted IC card to pass data, pre-paid
meter microprocessor to provide status display and alarm operation Signal and so on.
3, Non-volatile memory part of the working principle In
order to be able to permanently save important data in the case of AC
power loss and restore data on power up, the microprocessor of the
prepaid meter expands the nonvolatile memory through the serial
peripheral interface. Nonvolatile memory using serial electrically erasable and programmable
read and write memory, the use of electrically erasable and
programmable read and write memory online fast read and write functions
for data storage.
Through the above three points you can understand the working principle of three important parts of the prepaid meter. The
appearance and popularization and application of this unique pre-paid
meter not only solve a series of troublesome problems such as difficulty
in meter reading, difficulty in calculating accounts and difficulty in
charging, but also achieve the dual effects of control and economy.