CN2372815Y

CN2372815Y - Multifunctional protector for ac motor

Info

Publication number: CN2372815Y
Application number: CN 99231614
Authority: CN
Inventors: 罗治云
Original assignee: Individual
Current assignee: Individual
Priority date: 1999-05-12
Filing date: 1999-05-12
Publication date: 2000-04-05
Anticipated expiration: 2009-05-12

Abstract

The utility model relates to a motor protector, power supply circuit provide the power for the current sampling circuit that mains voltage sampling circuit, singlechip, dial, linear hall integrated circuit constitute, the current sampling circuit output hookup singlechip AD port input that mains voltage sampling circuit and linear hall integrated circuit constitute, dial output hookup singlechip RB port input, the RC port output hookup of singlechip supervision result indicating circuit and motor protection stop control circuit input and singlechip. The utility model discloses circuit structure is simple, and protective properties is good, and the electric current is set for conveniently and working range is big, easy maintenance.

Description

The alternating current machine multi-function protector

The utility model relates to motor protecter, is specifically related to a kind of alternating current machine multi-function protector.

In power network, alternating current machine is the maximum load of electrical network, generally is equiped with protective device so insert the motor of electrical network.The electric motor protective device that uses has relay system now, the electronic type that resolution element is formed, ic-type, these protective device protective values are poor, and function is few, and is coarse to the protection of motor.The monolithic processor controlled protector of existing use, owing to adopt single-chip microcomputer to separate with A/D converter, memory, current sampling adopts current transformer, and the protector volume is bigger, and maintenanceability is relatively poor.

The purpose of this utility model is to provide a kind of circuit structure simple, and protective value is good, the alternating current machine multi-function protector that sensitivity and reliability are high.

Technical solutions of the utility model are: it is by power circuit; the supply voltage sample circuit; the current sampling circuit that linear Hall integrated circuit (UGN-3501M) is formed; the single-chip microcomputer (PIC16C7X) of band A/D converter; dial; single-chip microcomputer monitors indicating circuit as a result; electric motor protecting stops control circuit and forms; its connection is; power circuit is the supply voltage sample circuit; single-chip microcomputer (PIC16C7X); dial; the current sampling circuit that linear Hall integrated circuit (UGN-3501M) is formed provides power supply; the current sampling circuit output that supply voltage sample circuit and linear Hall integrated circuit (UGN-3501M) are formed connects the A/D port input of single-chip microcomputer (PIC16C7X); the dial output connects the RB port input of single-chip microcomputer (PIC16C7X), and single-chip microcomputer monitors that as a result indicating circuit and electric motor protecting stop the control circuit input and connect with the RC port output of single-chip microcomputer (PIC16C7X).

Major advantage of the present utility model: circuit structure is simple, and protective value is good, and power consumption is few, and volume is little, and function is many, sensitivity, reliability height, and current settings is convenient and working range is big, easy to maintenance.

Accompanying drawing is the circuit structure schematic diagram of the utility model alternating current machine multi-function protector.

This circuit is by power circuit; the supply voltage sample circuit; the current sampling circuit that linear Hall integrated circuit (UGN-3501M) is formed; the single-chip microcomputer (PIC16C73) of band A/D converter; dial; single-chip microcomputer monitors indicating circuit as a result; electric motor protecting stops control circuit and forms; its connection is: power circuit is the supply voltage sample circuit; single-chip microcomputer (PIC16C73); dial; the current sampling circuit that linear Hall integrated circuit (UGN-3501M) is formed provides power supply; the current sampling circuit output that linear Hall integrated circuit (UGN-3501M) is formed and the AN0 of single-chip microcomputer (PIC16C73) A/D port; AN1; AN2 port input connects; supply voltage sample circuit output connects with the AN3 port input of single-chip microcomputer (PIC16C73) A/D port; the dial output connects with the RB port input of single-chip microcomputer (PIC16C73); the RC port output of single-chip microcomputer (PIC16C73) and single-chip microcomputer operation and monitor that the input that result's indication and electric motor protecting stop control circuit connecting; the electric motor protecting stopping signal is provided by the RC0 port of single-chip microcomputer (PIC16C73), and electric motor protecting stops control circuit by triode (9013); photoelectrical coupler (4N25); ac solid relay (CG3C; 5A/400V) form.

The operation principle of this alternating current machine multi-function protector is: dial is set the alternating current machine rated current and is converted to the RB port that digital quantity is delivered to single-chip microcomputer (PIC16C73); the current sampling circuit that linear Hall integrated circuit (UGN-3501M) is formed is taken a sample the three phase alternating current motor running current and is delivered to AN0, AN1, the AN2 port of single-chip microcomputer (PIC16C73) A/D port, and the supply voltage sample circuit is delivered to the sampling of main circuit alternating voltage the AN3 port of single-chip microcomputer (PIC16C73) A/D port.Single-chip microcomputer (PIC16C73) is analyzed the input data under program control; the protected mode of selecting the motor operation to follow; stop at the RC port of single-chip microcomputer (PIC16C73) and RA4 port output fault, overcurrent or short circuit, underload, overload, overvoltage, under voltage, phase shortage or the phase failure, current imbalance etc. monitor results, indicate by lumination of light emitting diode.RC0 port output motor disorderly closedown signal at single-chip microcomputer (PIC16C73) RC port; the electric motor protecting that this signal is formed through triode (9013), photoelectrical coupler (4N25), ac solid relay (CG3C, 5A/400V) stops control circuit K1, K2 and holds output; make electric motor protecting stop the ac contactor coil outage of control circuit control alternating current machine, motor power is disconnected and motor is protected.

Claims

A kind of alternating current machine multi-function protector; it is characterized in that: it is by power circuit; the supply voltage sample circuit; the current sampling circuit that linear Hall integrated circuit (UGN-3501M) is formed; the single-chip microcomputer (PIC16C7X) of band A/D converter; dial; single-chip microcomputer monitors indicating circuit as a result; electric motor protecting stops control circuit and forms; its connection is; power circuit is the supply voltage sample circuit; single-chip microcomputer (PIC16C7X); dial; the current sampling circuit that linear Hall integrated circuit (UGN-3501M) is formed provides power supply; the current sampling circuit output that supply voltage sample circuit and linear Hall integrated circuit (UGN-3501M) are formed connects single-chip microcomputer (PIC16C7X) A/D port input; the dial output connects single-chip microcomputer (PIC16C7X) RB port input, and single-chip microcomputer monitors that as a result indicating circuit and electric motor protecting stop the control circuit input and connect with single-chip microcomputer (PIC16C7X) RC port output.