Isolation load switching circuit based on HPLC communication control

Abstract

The invention discloses an isolation load switching circuit based on HPLC communication control, which belongs to the field of low-voltage power line carrier communication and characteristic current transmission and mainly comprises an isolation driving power supply circuit and a load switching circuit. The isolation driving power supply circuit is used for realizing electric energy meter rear residual voltage suppression by utilizing a three-terminal composite thermosensitive characteristic on the basis of providing a stable driving power supply for a rear-stage power switch tube; the load switching circuit fully utilizes totem pole driving and high-voltage power MOS characteristics to realize isolation negative feedback control, designs power MOS grid driving voltage and source power resistance, and controls circuit load impedance change through an HPLC PWM carrier switching signal, so that a current signal with a constant set rule is generated in a power grid; and the whole circuit is easy to realize, can be highly integrated in an HPLC communication unit, is controllable in cost, is matched with identification equipment, does not need manual intervention, and can accurately divide the affiliation relationship between the transformer and the intelligent electric meter.

Description

technical field [0001] The invention relates to the field of low-voltage power line carrier communication and characteristic current transmission, specifically refers to an isolated load switching circuit based on HPLC communication control, which is a key technology for the construction of smart grid high-quality stations, and especially relates to the characteristic current in the power system topology identification process send technology. Background technique [0002] At present, the frequent changes of power grid user information, the replacement of power meter failures, and the upgrading and transformation of high-quality station areas make the current station area topology frequently change. The existing mainstream HPLC carrier, micro-power wireless and other communication methods can realize cross-area meter reading Function, which undoubtedly brings greater difficulties to sort out the topological relationship of the station area. Even now, the overhead lines and g...

AI Technical Summary

Problems solved by technology

[0002] At present, the frequent changes of power grid user information, the replacement of power meter failures, and the upgrading and transformation of high-quality station areas make the current station area topology frequently change. The existing mainstream HPLC carrier, micro-power wireless and other communication methods can realize cross-area meter reading Function, which undoubtedly brings greater difficulties to sort out the topological relationship of the station area. Even now, the overhead lines and ground cables of the rural power grid and the urban network are shared, and the lines in the station area are complicated. Manual line inspection is not used to cooperate with the power outage of the station area. It is difficult to accurately distinguish the affiliation relationship between the user's power consumption phase and the transformer in the station area, which makes the refined line loss calculation impossible

[0003] The characteristic current transmission is the prerequisite for the realization of the topology identification technology in the station area. The traditional characteristic current transmission circuit uses the power frequency voltage to control the switch at the zero-crossing moment to realize the short-circuit of the zero and live wires in a short time, so that a large-value short-circuit current is generated on the power line instantaneously. The characteristic current transmission circuit has the disadvantage of affecting the reliability of power supply and making it impossible to miniaturize

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