CN201138746Y

CN201138746Y - Current sampling adjustment module of motor protector

Info

Publication number: CN201138746Y
Application number: CNU2008200819056U
Authority: CN
Inventors: 蔡甫寒; 周挺巧; 介国安
Original assignee: Individual
Current assignee: Individual
Priority date: 2008-01-06
Filing date: 2008-01-06
Publication date: 2008-10-22
Anticipated expiration: 2018-01-06

Abstract

The utility model relates to a motor protection equipment, in particular to a current sampling adjusting module for motor protector, and belongs to one part of the electronic components of the motor protector. The current sampling adjusting module for motor protector is characterized in that an electronic component board is equipped with a current sampling adjusting module, the module comprises a detection line of current transformer which is electrically connected with a bridge rectifier, the output terminal of the bridge rectifier is accessed to the negative input terminal of an operational amplifier, and the positive input terminal of the operational amplifier is accessed to the movable terminal of a variable potentiometer; one terminal of the fixed terminals of the variable potentiometer is accessed to the output terminal of the operational amplifier, the other terminal is accessed to the bridge rectifier, a signal taking resistance and a filter capacitor and earthed, the signal taking resistance and the other terminal of the filter capacitor are accessed to the negative input terminal of the operational amplifier, a diode is also accessed to the negative input terminal of the operational amplifier, the diode is electrically connected with a power supply VDC, and the operational amplifier is connected with a power supply VDC and VCC. The current sampling adjusting module for motor protector has the advantages of the simple, compact and reasonable structure and the small volume.

Description

The current sampling regulation module of electric motor protector

Technical field

The utility model relates to motor protection equipment, particularly a kind of The current sampling regulation module of electric motor protector.

Background technology

Motor protector current sampling in the past mostly is the three-phase current setting current of taking a sample respectively.Circuit design gets more complicated, and components and parts are many, and precision is low etc.

The utility model content

The purpose of this utility model is at above-mentioned defective, and a kind of The current sampling regulation module of electric motor protector is provided.

The technical solution of the utility model is a The current sampling regulation module of electric motor protector; comprise housing (1); housing (2) and electric sub-member plate; electronic circuit component is installed on the electric sub-member plate; it is characterized in that being equipped with on the said electric sub-member plate electronic circuit component is the current sampling adjustment module; this module comprises that the current transformer detection line is electrically connected with bridge rectifier; the bridge rectifier output inserts the transport and placing device negative input end; the transport and placing device positive input terminal inserts the variable potentiometer mobile terminal; variable potentiometer stiff end one termination is gone into the transport and placing device output; the other end inserts bridge rectifier; the number of winning the confidence resistance and filtering capacitor are to ground connection; the number of the winning the confidence resistance and the filtering capacitor other end insert the transport and placing device negative input end; the transport and placing device negative input end also inserts diode; diode is electrically connected with power vd C, inserts power vd C and VCC on the transport and placing device.

Said current transformer detection line is three-phase detection circuit or two-phase detection line, its A inserts 1 pin of bridge rectifier D B1 mutually, its B inserts 1,3 pin of bridge rectifier D B2, DB1 mutually, C inserts 3 pin of bridge rectifier D B2 mutually, the 4 pin ground connection of bridge rectifier D B1, DB2,2 pin insert the negative input end of transport and placing device U1; Be connected to capacitor C 2 in parallel between the positive pole of transport and placing device U1 and the output and be connected with variable potentiometer W1 mobile terminal.

Said bridge rectifier D B1, DB2 model are MB6S; The model of said transport and placing device U1 is LM224; Said diode D1 model is 4148, and capacitor C1 is 2.2 μ F, and C2 is 473.

The utility model has the advantages that the simple compact and reasonable of circuit structure, volume is little, also just makes overall structure seem exquisite.

Description of drawings

Fig. 1 is the utility model overall structure schematic diagram.

Fig. 2 is the utility model circuit theory diagrams.

Embodiment

Further specify embodiment below in conjunction with accompanying drawing.

Referring to Fig. 1, Fig. 2,1-housing, 2-housing.As shown in Figure 2, on the current sampling adjustment module circuit, mainly contain current transformer detection line L1, L2, L3, be provided with when detecting three phase mains, L1 represents that A inserts 1 pin on the bridge rectifier D B1 mutually, L2 represents that B inserts 3 pin and 1 pin of DB1 and DB2 mutually, and L3 represents that C inserts 3 pin of DB2 mutually; 2 pin of DB1 and the series connection of 2 pin of DB2 insert the negative output terminal of transport and placing device U1, and 4 pin of DB1 are connected with 4 pin of DB2, insert earth terminal, and capacitor C1, resistance R A, RB, a RC termination in parallel are gone into the negative input end of transport and placing device, other end ground connection; Between the positive input terminal of transport and placing device U1 and the output and be connected to capacitor C2, an end output current signal, an end is connected with the variable potentiometer mobile terminal, and variable potentiometer stiff end one end is connected with transport and placing device U1 output, and the other end is connected to resistance R W1, RW2; Resistance R W1, the RW2 earth terminal that inserts in parallel; Be connected with diode D1 between U1 negative input end and bridge rectifier D B1, DB2 the 2nd pin, the D1 other end inserts power vd C, is connected to power vd C and VCC on the transport and placing device U1.Herein, the bridge rectifier model is MB6S, and the model of transport and placing device U1 is that LM224, diode D1 model are 4148, and capacitor C1 model is 2.2 μ F, and C2 is 473.

The complete machine operation principle is that instrument transformer L1, L2, the detected three-phase current signal of L3 are through three-phase bridge rectifier DB1, DB2 rectification, and connecting resistance RA, RB, RC power taking stream signal and electrolytic capacitor C1 filtering, amplify through transport and placing device U1 negative feedback amplifier again, variable potentiometer W1 setting current, transposing resistance R W1, RW2 determine ull-scale value.The scope of setting current is divided into four specification 0.3-1.2A, 1-4A, 3-12A, 10-40A, change resistance R A RB the RC resistance, change again RW1 RW2 determine each specification ull-scale value, four specifications are the same in the ull-scale value of U1 output.This module is a part in the motor protector electronic building brick.

Claims

1; The current sampling regulation module of electric motor protector; comprise housing (1); housing (2) and electric sub-member plate; electronic circuit component is installed on the electric sub-member plate; it is characterized in that being equipped with on the said electric sub-member plate electronic circuit component is the current sampling adjustment module; this module comprises that the current transformer detection line is electrically connected with bridge rectifier; the bridge rectifier output inserts the transport and placing device negative input end; the transport and placing device positive input terminal inserts the variable potentiometer mobile terminal; variable potentiometer stiff end one termination is gone into the transport and placing device output; the other end inserts bridge rectifier; the number of winning the confidence resistance and filtering capacitor are to ground connection; the number of the winning the confidence resistance and the filtering capacitor other end insert the transport and placing device negative input end; the transport and placing device negative input end also inserts diode; diode is electrically connected with power vd C, inserts power vd C and VCC on the transport and placing device.

2, according to the said The current sampling regulation module of electric motor protector of claim 1, it is characterized in that said current transformer detection line is three-phase detection circuit or two-phase detection line, its A inserts 1 pin of bridge rectifier D B1 mutually, its B inserts 1,3 pin of bridge rectifier D B2, DB1 mutually, C inserts 3 pin of bridge rectifier D B2 mutually, the 4 pin ground connection of bridge rectifier D B1, DB2,2 pin insert the negative input end of transport and placing device U1; Be connected to capacitor C 2 in parallel between the positive pole of transport and placing device U1 and the output and be connected with variable potentiometer W1 mobile terminal.

3,, it is characterized in that said bridge rectifier D B1, DB2 model are MB6S according to claim 1 or 2 said The current sampling regulation module of electric motor protector; The model of said transport and placing device U1 is LM224; Said diode D1 model is 4148, and capacitor C1 is 2.2 μ F, and C2 is 473.