CN202009226U - Three-phase power distribution carrier monitoring device for low-voltage cabinet - Google Patents

Abstract

The utility model relates to a three-phase power distribution carrier monitoring device for a low-voltage cabinet, which comprises a voltage detection circuit consisting of a voltage transformer BL, a diode D1, a capacitor1C1, and a resistor 1R1. When an L1 and an N form an AC220V loop, output 2.2V AC voltage signals are connected to the voltage transformer BL, the output signals of the voltage transformer BL are input into the input end of an A/D (Analog to Digital) conversion chip IC1 after being subjected to rectification of the diode D1, filtering of the capacitor1C1, and current limitation of the resistor 1R1, and the signals receiving A/D conversion are transmitted to a singlechip IC2. The device adopts high-precision transformation ratio output of a voltage transformer, is controlled by the singlechip after signal processing, and has a self-restoring function. An alarm is given out and the power is cut off in case of over-high voltage and the power supply is automatically recovered when the voltage becomes normal again, and the alarm is sent to a mainframe through carrier wave, solving the problem of complicated wiring and ensuring reliability and safety of a system.

Description

Low-voltage cabinet three-phase distribution carrier monitoring device

Technical field

The utility model relates to field of monitoring devices, is specifically related to a kind of low-voltage cabinet three-phase distribution carrier monitoring device.

Background technology

The low-voltage cabinet distribution system is for whether operate as normal is concerning the power supply quality quality, the low-voltage distribution remote transmission is mainly transmitted in wired mode, and because of low power distribution system is to use forceful electric power, and system bus is a weak electricity system, forceful electric power often taking place seal in the weak electricity system, causes burning out The whole control system.

The utility model content

The purpose of this utility model is to overcome above-mentioned deficiency, and a kind of low-voltage cabinet three-phase distribution carrier monitoring device is provided.

The technical scheme that the utility model adopted is such: low-voltage cabinet three-phase distribution carrier monitoring device, comprise by voltage transformer BL, diode D1, electric capacity 1C1, the voltage detecting circuit that resistance 1R1 forms, 2.2V ac voltage signal by the output of AC220V loop is connected to voltage transformer BL, by the output signal of voltage transformer BL through diode D1 rectification, electric capacity 1C1 filtering, after the resistance 1R1 current limliting, be input to the input of A/D conversion chip IC1, signal conveys after the A/D conversion is to single-chip microcomputer IC2, single-chip microcomputer IC2 divides three tunnel outputs, the first via is connected to the base stage of triode Q1 through resistance 1R3 by the level of single-chip microcomputer IC2 output, the emitter of triode Q1 connects relay J 2, by the switch J2-1 control promotion contactor KM of relay J 2; Secondary route is connected to loud speaker BY by the level of single-chip microcomputer IC2 output after resistance 1R4 current limliting; Third Road is connected to the base stage of triode Q2 through resistance 1R2 by the current potential of single-chip microcomputer IC2 output, the emitter of triode Q2 connects relay J 1, is exported by the switch J1-1 control of relay J 1 to connect the carrier transmit circuit of being made up of the one 555 time-base circuit U1, the 2 555 time-base circuit U2, transformer BT.

By adopting the aforementioned techniques scheme, the beneficial effects of the utility model are: this device adopts high-precision voltage transformer no-load voltage ratio output, after signal processing, export by Single-chip Controlling, send alarm signal and cut off the electricity supply when the voltage superelevation, voltage recovers automatic recovery of power supply just often, simultaneously alarm signal is reported to the police to main frame by carrier system, solved the many difficult problems of wiring, and the reliability and the fail safe of the system of assurance.

Description of drawings

Fig. 1 is the circuit theory diagrams of the utility model embodiment.

Embodiment

Further specify the utility model below in conjunction with the drawings and specific embodiments.

As shown in Figure 1, low-voltage cabinet three-phase distribution carrier monitoring device, comprise by voltage transformer BL, diode D1, electric capacity 1C1, the voltage detecting circuit that resistance 1R1 forms, work as L1, when N constitutes the AC220V loop, be connected to voltage transformer BL with 100: 1 output 2.2V ac voltage signals, by the output signal of voltage transformer BL through diode D1 rectification, electric capacity 1C1 filtering, after the resistance 1R1 current limliting, be input to the 2nd pin input of A/D conversion chip IC1, signal after the A/D conversion is input to the 36th of single chip machine controlling circuit IC4,37,38 pin, read the data of A/D conversion chip IC1 through single-chip microcomputer IC2 after, when handling above set point by single-chip microcomputer IC4 internal processes, divide three tunnel outputs, first via output makes triode Q3 conducting by the 28th pin output high level of single-chip microcomputer IC4 through resistance R 6 current limlitings, relay J 2 adhesives, switch J2-1 also transfers normally closed point to, promotes contactor KM adhesive.The 2nd pin output low level of secondary route single-chip microcomputer IC4 makes BY send the alarm sound that ticks through the 1R4 current limliting, the expression electric voltage exception; Third Road is formed the carrier transmit circuit by the one 555 time-base circuit U1, the 2 555 time-base circuit U2, transformer BT, export high potential when the 32nd pin of single-chip microcomputer IC4 and make triode Q2 conducting through resistance 1R2 current limliting, relay J 1 adhesive, switch J1-1 makes M and M1 point be in on-state by transferring normally closed point normal battle to.The one 555 time-base circuit U1 and the 2 555 time-base circuit U2 are the oscillating circuit of different frequency, (short-circuit type alarm probe signal) the one 555 time-base circuit U1 constitutes low-frequency oscillatory network when M and M1 two terminal shortcircuits, mainly by capacitor C 1, resistance R 2 decisions, its 3rd pin output frequency is the low frequency signal of F1 to frequency F1.When the 3rd pin of the one 555 time-base circuit U1 is exported high level, the high-frequency oscillating circuits work that the 2 555 time-base circuit U2 constitutes, its frequency of oscillation F2 is mainly by capacitor C 3, resistance R 4 decisions, and F2 is output as the pulse-modulated signal of F2 like this much larger than F1 at the 3rd pin of the 2 555 time-base circuit U2.This modulation signal produces the high frequency modulated pulse by the drive circuit of being made up of triode Q1, transformer BT, capacitor C 5, capacitor C 6 on power line, the high frequency modulated pulse voltage sends the carrier wave alarm signal to the carrier wave main frame.

When the potential value of the output voltage signal of resistance 1R1 current limliting is lower than single-chip microcomputer IC2 internal processes set point, after inter-process, divide two-way output, first via output ends triode Q1 by IC2 the 28th pin output low level through resistance 1R3 current limliting, relay J 2 discharges, switch J2-1 is normally closed to transfer normal battle to, promotes contactor KM and discharges.The second tunnel output is exported high level through resistance 1R4 current limliting by the 2nd pin of single-chip microcomputer IC, makes loud speaker BY stop to send the alarm sound that ticks, and expression voltage has recovered normal.

More than show and described basic principle of the present utility model and principal character and advantage thereof; the technical staff of the industry should understand; the utility model is not restricted to the described embodiments; that describes in the foregoing description and the explanation just illustrates principle of the present utility model; under the prerequisite that does not break away from the utility model spirit and scope; the utility model also has various changes and modifications; these changes and improvements all fall in claimed the utility model scope, and the claimed scope of the utility model is defined by appending claims and equivalent thereof.

Claims (1)

1. low-voltage cabinet three-phase distribution carrier monitoring device, it is characterized in that: comprise by voltage transformer BL, diode D1, electric capacity 1C1, the voltage detecting circuit that resistance 1R1 forms, 2.2V ac voltage signal by the output of AC220V loop is connected to voltage transformer BL, by the output signal of voltage transformer BL through diode D1 rectification, electric capacity 1C1 filtering, after the resistance 1R1 current limliting, be input to the input of A/D conversion chip IC1, signal conveys after the A/D conversion is to single-chip microcomputer IC2, single-chip microcomputer IC2 divides three tunnel outputs, the first via is connected to the base stage of triode Q1 through resistance 1R3 by the level of single-chip microcomputer IC2 output, the emitter of triode Q1 connects relay J 2, by the switch J2-1 control promotion contactor KM of relay J 2; Secondary route is connected to loud speaker BY by the level of single-chip microcomputer IC2 output after resistance 1R4 current limliting; Third Road is connected to the base stage of triode Q2 through resistance 1R2 by the current potential of single-chip microcomputer IC2 output, the emitter of triode Q2 connects relay J 1, is exported by the switch J1-1 control of relay J 1 to connect the carrier transmit circuit of being made up of the one 555 time-base circuit U1, the 2 555 time-base circuit U2, transformer BT.