The utility model discloses a novel
electric energy meter or collection terminal is with intelligent charging circuit, including
voltage reducing module U4 and load VCAP,
voltage reducing module U4 is provided with input terminal pin VIN, output terminal pin SW and feedback terminal pin FB, output terminal pin SW electric connection has
energy storage inductance L5,
energy storage inductance L5 is connected with access point VCC through the conducting wire,
energy storage inductance L5 and access point VCC between have
filter capacitor C30,
filter capacitor C16 and
filter capacitor EC8 in proper order, be provided with
diode D25 between charging resistance and load VCAP. The utility model is provided with
triode Q5, forms the clamping circuit through, and utilizes the VEB
constant voltage difference of
triode when power on, makes U4 output
voltage be clamped and always exist fixed voltage difference with
farad capacitor, and the power supply circuit is protected in the power-on instant, prevents charging current overload, guarantees the stable reliable normal operation of product, reduces the instantaneous
impact to
power grid simultaneously, makes the product effectively restrain the interference or influence to
power grid.