CN205300716U - Weighting meter - Google Patents

Abstract

The utility model provides a weighting meter, includes: power supply circuit, the signal acquisition circuit that weighs, singlechip peripheral circuit, LED show modular unit circuit, communication interface circuit, switch button and external memory, weigh signal acquisition circuit LED demonstration modular unit circuit communication interface circuit the switch button and the equal electricity of external memory connect in singlechip in the singlechip peripheral circuit, power supply circuit holds power source and is used for connecting including the preceding stage power input that is used for inserting the vehicle mounted power in the singlechip peripheral circuit the back level output power source of singlechip.

Description

Weighing instrument

Technical field

This utility model relates to electronic technology field, particularly to a kind of weighing instrument.

Background technology

The appearance of electronic weighing technology, has been greatly facilitated animal husbandry scientific culture and the development of industry manufacturing technology. Particularly weigh automatic blending technology and product, in the application of animal husbandry scientific culture, industrial processes, both improve the quality of product, and improve again production efficiency. The application of weighing instrument gets more and more, and weighing instrument technology have also been obtained and develops quickly.

Weighing instrument on the market is used in fixed-site mostly at present, as platform balance, on-ground weigher, container claim, truck scale etc., instrument power supply also more adopts mains 220V to power, if it is desired to all cannot be able to use because of power issue when being used on the equipment that a class such as feed-stuff mixer or automatic blending car moves.

Summary of the invention

In view of this, it is necessary to a kind of weighing instrument is provided.

This utility model embodiment provides a kind of weighing instrument, including: power circuit, weighing-up wave Acquisition Circuit, SCM peripheral circuit, LED display module element circuit, communication interface circuit, switch key and external memory storage, described weighing-up wave Acquisition Circuit, described LED display module element circuit, described communication interface circuit, described switch key and described external memory storage are electrically connected to the single-chip microcomputer in described SCM peripheral circuit, described power circuit includes the prime power input power interface for accessing vehicle power, and for connecting the rear class output end power interface of the described single-chip microcomputer in described SCM peripheral circuit.

More preferably, described power circuit includes NMOS tube Q3, NMOS tube Q4, PMOS Q5, overvoltage protection chip U5, switch access point SW1, switch access point SW2, diode D2, diode D3, Zener diode D4, electric capacity C11, electrochemical capacitor C16, electrochemical capacitor C17, electric capacity C18, electrochemical capacitor C19, audion Q1, resistance R8, resistance R9, resistance R10, resistance R14, resistance R15, resistance R16, resistance R17, resistance R18, resistance R19, electric fuse F1, three terminal integrated voltage stabilizer forms, the drain electrode of described NMOS tube Q3 connects the negative pole of described vehicle power, described electric fuse F1 and described resistance R8 is parallel to the positive pole of described vehicle power, and the grid of described NMOS tube Q3 connects described resistance R8, the positive pole of described electrochemical capacitor C19, described resistance R9, the IN pin of described overvoltage protection chip U5, the SHDN pin of described overvoltage protection chip U5, and the drain electrode of described NMOS tube Q4 be connected to described electric fuse F1, described resistance R9 and described resistance R10 is parallel to the OVSET pin of described overvoltage protection chip U5, the grid of described NMOS tube Q4 and described electric capacity C18 are also connected to the GATE pin of described overvoltage protection chip U5, the source electrode of described NMOS tube Q4, the positive pole of described electrochemical capacitor C17, described resistance R14, the sources connected in parallel of described resistance R17 and described PMOS Q5 is in the OUTFB pin of described overvoltage protection chip U5, and described switch access point SW1 is connected with described resistance R17, described resistance R14, described resistance R15 is parallel to the grid of described PMOS Q5, and the colelctor electrode c of described audion Q1 is connected to described resistance R15, described resistance R19, described resistance R16 is parallel to the base stage of described audion Q1, described diode D2, described diode D3 is parallel to described resistance R16, described diode D2, described Zener diode D4 is parallel to described switch access point SW2, and described resistance R18 is connected with described diode D3, the positive pole of described electrochemical capacitor C16, described electric capacity C11, the Vin pins in parallel of described three terminal integrated voltage stabilizer is in the drain electrode of described PMOS Q5, and the Vout pin of described three terminal integrated voltage stabilizer accesses the described single-chip microcomputer in described single chip circuit, the source electrode of described NMOS tube Q3, described electrochemical capacitor C19, described resistance R10, the GND pin of described overvoltage protection chip U5, described electric capacity C18, the negative pole of described electrochemical capacitor C17, the emitting stage of described audion Q1, described resistance R19, described Zener diode D4, described resistance R18, the negative pole of described electrochemical capacitor C16, described electric capacity C11, the GND pin ground connection of described three terminal integrated voltage stabilizer.

More preferably, described weighing-up wave Acquisition Circuit includes TVS diode D16, TVS diode D17, inducer L1, inducer L2, resistance R30, resistance R31, electric capacity C30, electric capacity C31, electric capacity C32, resistance R32, resistance R33, electric capacity C33, audion Q8, A/D conversion chip U7, resistance R4, electrochemical capacitor C6, electric capacity C7, for connecting the transducing signal receiving interface J3 of weighing-up wave harvester, and for connecting the interface microcontroller J2 of described single-chip microcomputer, described TVS diode D16 and described inducer L1 are also connected to 3 feet of described transducing signal receiving interface J3, described TVS diode D17 and described inducer L2 are also connected to 2 feet of described transducing signal receiving interface J3, described resistance R30 connects with described inducer L1, described resistance R31 connects with described inducer L2, described resistance R30 and described electric capacity C30 is parallel to the INNA pin of described A/D conversion chip U7, described resistance R31 and described electric capacity C30 is parallel to the INPA pin of described A/D conversion chip U7, described electric capacity C31, described resistance R32, the colelctor electrode of described audion Q8 and 6 feet of described transducing signal receiving interface J6 are parallel to the AVDD pin of described A/D conversion chip U7, described resistance R32 and described resistance R33 is parallel to the VFEB pin of described A/D conversion chip U7, described electric capacity C31 and described resistance R33 is parallel to the AGND pin of described A/D conversion chip U7, described electric capacity C31 and described electric capacity C32 is parallel to the VBG pin of described A/D conversion chip U7, the base stage of described audion Q8 is connected with the BASE pin of described A/D conversion chip U7, described electric capacity C33, the emitter stage of described audion Q8, described resistance R4, described electrochemical capacitor C6, described electric capacity C7, 1 foot of described interface microcontroller J2, the DVDD pins in parallel of described A/D conversion chip U7 is in the VSUP pin of described A/D conversion chip U7, and the RATE pin of described A/D conversion chip U7 is connected to described resistance R4, described electrochemical capacitor C6, described electric capacity C7 is parallel to 1 foot of described interface microcontroller J2, the DOUT pin of described A/D conversion chip U7 is serially connected with 2 feet of described interface microcontroller J2, the PD_SCK pin of described A/D conversion chip U7 is serially connected with 3 feet of described interface microcontroller J2, the INPB pin of described A/D conversion chip U7 is serially connected with the INNB pin of described A/D conversion chip U7,1 foot of described transducing signal receiving interface J3, described TVS diode D16, described TVS diode D17, described electric capacity C31, described resistance R33, described electric capacity C32, the AGND pin of described A/D conversion chip U7, described electric capacity C33, described electrochemical capacitor C6, described electric capacity C7, described resistance R4, 4 feet of described interface microcontroller J2.

More preferably, described LED display module element circuit includes LED drive chip U2, LED charactron DS1, LED charactron DS2, LED charactron DS3, LED charactron DS4, LED charactron DS5, LED charactron DS6, light emitting diode D11, light emitting diode D12, light emitting diode D13, light emitting diode D14, light emitting diode D15, resistance R5, resistance R6, resistance R7, electric capacity C5, and for being connected to the interface microcontroller J8, described resistance R5 of described single-chip microcomputer, described resistance R6, described resistance R7, described electric capacity C5 is parallel to the VDD pin of described LED drive chip U2, and the VDD pin of described LED drive chip U2 and 5 feet of described interface microcontroller J8 access the voltage VCC, described resistance R5 that described power circuit provides, 4 feet of described interface microcontroller J8 are parallel to the DIO pin of described LED drive chip U2, described resistance R6, 3 feet of described interface microcontroller J8 are parallel to the CLK pin of described LED drive chip U2, described resistance R7, 2 feet of described interface microcontroller J8 are parallel to the STB pin of described LED drive chip U2, described light emitting diode D11, described light emitting diode D12, described light emitting diode D13, described light emitting diode D14, described light emitting diode D15 also ties the GR7 pin receiving described LED drive chip U2, described light emitting diode D11, the a pin of described LED charactron DS1, the a pin of described LED charactron DS2, the a pin of described LED charactron DS3, the a pin of described LED charactron DS4, the a pin of described LED charactron DS5, the a pins in parallel of LED charactron DS6 is in the SEG1 pin of described LED drive chip U2, described light emitting diode D12, the b pin of described LED charactron DS1, the b pin of described LED charactron DS2, the b pin of described LED charactron DS3, the b pin of described LED charactron DS4, the b pin of described LED charactron DS5, the b pins in parallel of LED charactron DS6 is in the SEG2 pin of described LED drive chip U2, described light emitting diode D13, the c pin of described LED charactron DS1, the c pin of described LED charactron DS2, the c pin of described LED charactron DS3, the c pin of described LED charactron DS4, the c pin of described LED charactron DS5, the c pins in parallel of LED charactron DS6 is in the SEG3 pin of described LED drive chip U2, described light emitting diode D14, the d pin of described LED charactron DS1, the d pin of described LED charactron DS2, the d pin of described LED charactron DS3, the d pin of described LED charactron DS4, the d pin of described LED charactron DS5, the d pins in parallel of LED charactron DS6 is in the SEG4 pin of described LED drive chip U2, described light emitting diode D15, the e pin of described LED charactron DS1, the e pin of described LED charactron DS2, the e pin of described LED charactron DS3, the e pin of described LED charactron DS4, the e pin of described LED charactron DS5, the e pins in parallel of LED charactron DS6 is in the SEG5 pin of described LED drive chip U2, the f pin of described LED charactron DS1, the f pin of described LED charactron DS2, the f pin of described LED charactron DS3, the f pin of described LED charactron DS4, the f pin of described LED charactron DS5, the f pins in parallel of LED charactron DS6 is in the SEG6 pin of described LED drive chip U2, the g pin of described LED charactron DS1, the g pin of described LED charactron DS2, the g pin of described LED charactron DS3, the g pin of described LED charactron DS4, the g pin of described LED charactron DS5, the g pins in parallel of LED charactron DS6 is in the SEG8 pin of described LED drive chip U2, the dp pin of described LED charactron DS1, the dp pin of described LED charactron DS2, the dp pin of described LED charactron DS3, the dp pin of described LED charactron DS4, the dp pin of described LED charactron DS5, the dp pins in parallel of LED charactron DS6 is in the SEG7 pin of described LED drive chip U2, described LED charactron DS1 is connected to the GR6 foot of described LED drive chip U2, described LED charactron DS2 is connected to the GR5 foot of described LED drive chip U2, described LED charactron DS3 is connected to the GR4 foot of described LED drive chip U2, described LED charactron DS4 is connected to the GR3 foot of described LED drive chip U2, described LED charactron DS5 is connected to the GR2 foot of described LED drive chip U2, described LED charactron DS6 is connected to the GR1 foot of described LED drive chip U2, described electric capacity C5, the GND pin of described LED drive chip U2, the 1 foot ground connection of described interface microcontroller J8.

More preferably, described communication interface circuit includes electrical level transferring chip U3, bidirectional protective diode TVS4, bidirectional protective diode TVS5, electric capacity C24, electric capacity C23, electric capacity C22, electric capacity C21, electric capacity C20, inducer L3, inducer L5, resistance R24, resistance R25 and signal output interface J11, described inducer L3 for outer signal reception equipment, described resistance R24 is concatenated into 3 feet of described signal output interface J11, and described inducer L3 and described bidirectional protective diode TVS4 is parallel to the R2IN pin of described electrical level transferring chip U3, described inducer L5, described resistance R25 is concatenated into 2 feet of described signal output interface J11, described inducer L5 and described bidirectional protective diode TVS5 is parallel to the T2OUT pin of described electrical level transferring chip U3, described electric capacity C20 is series between the C1+ pin of described electrical level transferring chip U3 and the C1-pin of described electrical level transferring chip U3, described electric capacity C21 is series between the C2+ pin of described electrical level transferring chip U3 and the C2-pin of described electrical level transferring chip U3, described electric capacity C22 is series at the V-pin of described electrical level transferring chip U3, described electric capacity C23 is series between the V+ pin of described electrical level transferring chip U3 and the VCC pin of described electrical level transferring chip U3, the VCC pin of described electric capacity C23 and described electrical level transferring chip U3 is parallel to described electric capacity C24,5 feet of described signal output interface J11, described bidirectional protective diode TVS4, described bidirectional protective diode TVS5, described electric capacity C22, the GND pin of described electrical level transferring chip U3, described electric capacity C24 ground connection.

More preferably, described signal output interface J11 is positioned in a kind of waterproof construction, and described waterproof construction includes waterproof case and sealing ring, and described waterproof case is provided with the water joint fixing hole for placing described signal output interface J11.

More preferably, described SCM peripheral circuit includes single-chip microcomputer U1, storage chip U4, electric capacity C1, electric capacity C2, electric capacity C3, electrochemical capacitor C4, electric capacity C25, electric capacity C100, electric capacity C101, electric capacity C102, electric capacity C103, electric capacity C104, weighing-up wave Acquisition Circuit interface J14, LED display module element circuit interface J4, keyboard and switch interface JP for external connection keyboard and switch, resistance R1, resistance R2, resistance R3, audion Q2, resistance R100, resistance R101, resistance R102, resistance R103, resistance R104, button access point KEY1, button access point KEY2, button access point KEY3, button access point KEY4, button access point KEY5, buzzer BZ1 and crystal oscillator Y1, the emitter stage of described audion Q2 connects the described power circuit providing voltage VCC, the base stage of described audion Q2 is connected to the P1.0 pin of described single-chip microcomputer U1 by described resistance R3, the colelctor electrode of described audion Q2 is connected to described buzzer BZ1, the A0 pin of described storage chip U4, the A1 pin of described storage chip U4, the A2 pin of described storage chip U4, the VSS pin of described storage chip U4 and the WP pins in parallel of described storage chip U4 are in described electric capacity C25, described electric capacity C25 is serially connected with the VDD pin of described storage chip U4, the VDD pin of described storage chip U4 connects the described power circuit providing voltage VCC, the P0.4 pins in parallel of described resistance R1 and described single-chip microcomputer U1 is in the SDA pin of described storage chip U4, the P0.3 pins in parallel of described resistance R2 and described single-chip microcomputer U1 is in the SCL pin of described storage chip U4, described resistance R1 and described resistance R2 is parallel to the described power circuit providing voltage VCC, described electric capacity C1, described crystal oscillator Y1 is parallel to the XTAL2 pin of described single-chip microcomputer U1, described electric capacity C2, described crystal oscillator Y1 is parallel to the XTAL1 pin of described single-chip microcomputer U1, and described electric capacity C3 and described electrochemical capacitor C4 is parallel to the VCC pin of described single-chip microcomputer U1, and the VCC pin of described single-chip microcomputer U1 connects the described power circuit providing voltage VCC, described resistance R100, described resistance R101, described resistance R102, described resistance R103 and described resistance R104 is parallel to the described power circuit providing voltage VCC, described electric capacity C100 and described resistance R100 is parallel to described button access point KEY1, described electric capacity C101 and described resistance R101 is parallel to described button access point KEY2, described electric capacity C102 and described resistance R102 is parallel to described button access point KEY3, described electric capacity C103 and described resistance R103 is parallel to described button access point KEY4, described electric capacity C104 and described resistance R104 is parallel to described button access point KEY5, described electric capacity C100, described electric capacity C101, described electric capacity C102, parallel connection between described electric capacity C103 and described electric capacity C104, described switch access point SW1 is connected to 1 foot of described keyboard and switch interface JP, described switch access point SW2 is connected to 2 feet of described keyboard and switch interface JP, described button access point KEY1 is connected to 3 feet of described keyboard and switch interface JP and the P1.3 pin of described single-chip microcomputer U1, described button access point KEY2 is connected to 4 feet of described keyboard and switch interface JP and the P1.4 pin of described single-chip microcomputer U1, described button access point KEY3 is connected to 5 feet of described keyboard and switch interface JP and the P1.5 pin of described single-chip microcomputer U1, described button access point KEY4 is connected to 6 feet of described keyboard and switch interface JP and the P1.6 pin of described single-chip microcomputer U1, described button access point KEY5 is connected to 7 feet of described keyboard and switch interface JP and the P1.7 pin of described single-chip microcomputer U1, 5 feet of described LED display module element circuit interface J4 and 4 feet of described weighing-up wave Acquisition Circuit interface J14 are connected to the described power circuit providing voltage VCC, 4 feet of described LED display module element circuit interface J4 are connected to the P0.0 pin of described single-chip microcomputer U1, 3 feet of described LED display module element circuit interface J4 are connected to the P0.1 pin of described single-chip microcomputer U1, 2 feet of described LED display module element circuit interface J4 are connected to the P0.2 pin of described single-chip microcomputer U1, 3 feet of described weighing-up wave Acquisition Circuit interface J14 are connected to the P1.2 pin of described single-chip microcomputer U1, 2 feet of described weighing-up wave Acquisition Circuit interface J14 are connected to the P1.1 pin of described single-chip microcomputer U1, described buzzer BZ1, the A0 pin of described storage chip U4, the A1 pin of described storage chip U4, the A2 pin of described storage chip U4, the VSS pin of described storage chip U4, the WP pin of described storage chip U4, described electric capacity C25, described electric capacity C100, described electric capacity C101, described electric capacity C102, described electric capacity C103, described electric capacity C104, 8 feet of described keyboard and switch interface JP, 1 foot of described weighing-up wave Acquisition Circuit interface J14, 1 foot of described LED display module element circuit interface J4, described electric capacity C1, described electric capacity C2, described electric capacity C3, described electrochemical capacitor C4, and the GND pin ground connection of described single-chip microcomputer U1.

Resistance strain weighing transducer signal can be carried out high precision collecting, filtering, conversion, shows, upload by the weighing instrument that this utility model embodiment provides, capacity of resisting disturbance is strong, improve the stability of measurement system, reliability and certainty of measurement, adapt to industry spot strong electromagnetic environment. Input on power supply input, hardware, output channel have all designed protection circuit, thus not only increasing the safety of host computer system, and improve the jamproof ability of input channel. Properties of product are reliable, and weighing precision is high, good stability, and fault is few, compact conformation, and area occupied is few, it is easy to install and safeguard, have more washability to select for user. Be applicable to platform balance, the fixed-site such as on-ground weigher, container claim, truck scale, it is possible to use under the mobile environment such as feed-stuff mixer or automatic blending car.

Accompanying drawing explanation

In order to be illustrated more clearly that the technical scheme of this utility model embodiment, the accompanying drawing used required in embodiment will be briefly described below, apparently, accompanying drawing in the following describes is some embodiments of this utility model embodiment, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.

Accompanying drawing 1 is the schematic diagram of the weighing instrument of a better embodiment.

Accompanying drawing 2 be a better embodiment weighing instrument in the schematic diagram of power circuit.

Accompanying drawing 3 be a better embodiment weighing instrument in the schematic diagram of weighing-up wave Acquisition Circuit.

Accompanying drawing 4 be a better embodiment weighing instrument in the schematic diagram of SCM peripheral circuit.

Accompanying drawing 5 be a better embodiment weighing instrument in the schematic diagram of LED display module element circuit.

Accompanying drawing 6 be a better embodiment weighing instrument in the schematic diagram of communication interface circuit.

Accompanying drawing 7 be a better embodiment weighing instrument in waterproof construction schematic diagram.

Detailed description of the invention

Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is clearly and completely described, it is clear that described embodiment is a part of embodiment of this utility model, rather than whole embodiments. Based on the embodiment in this utility model, the every other embodiment that those of ordinary skill in the art obtain under not making creative work premise, broadly fall into the scope of this utility model protection.

Please with reference to Fig. 1-Fig. 6, this utility model embodiment provides a kind of weighing instrument, it comprises the steps that power circuit 10, weighing-up wave Acquisition Circuit 11, SCM peripheral circuit 12, LED display module element circuit 13, communication interface circuit 14, external memory storage 15 and switch key 16, weighing-up wave Acquisition Circuit, LED display module element circuit, communication interface circuit, switch key and external memory storage are electrically connected to the single-chip microcomputer in SCM peripheral circuit, power circuit includes the prime power input power interface for accessing vehicle power, and for connecting the rear class output end power interface of the single-chip microcomputer in SCM peripheral circuit.

In this utility model embodiment, power circuit 10 includes NMOS tube Q3, NMOS tube Q4, PMOS Q5, overvoltage protection chip U5, switch access point SW1, switch access point SW2, diode D2, diode D3, Zener diode D4, electric capacity C11, electrochemical capacitor C16, electrochemical capacitor C17, electric capacity C18, electrochemical capacitor C19, audion Q1, resistance R8, resistance R9, resistance R10, resistance R14, resistance R15, resistance R16, resistance R17, resistance R18, resistance R19, electric fuse F1, three terminal integrated voltage stabilizer forms, and the drain electrode of NMOS tube Q3 meets the negative pole of vehicle power, electric fuse F1 and resistance R8 and is parallel to the positive pole of vehicle power, and the grid of NMOS tube Q3 connects resistance R8, the positive pole of electrochemical capacitor C19, resistance R9, the IN pin of overvoltage protection chip U5, the SHDN pin of overvoltage protection chip U5, and the drain electrode of NMOS tube Q4 be connected to electric fuse F1, resistance R9 and resistance R10 is parallel to the OVSET pin of overvoltage protection chip U5, and the grid of NMOS tube Q4 and electric capacity C18 are also connected to the GATE pin of overvoltage protection chip U5, the source electrode of NMOS tube Q4, the positive pole of electrochemical capacitor C17, resistance R14, the sources connected in parallel of resistance R17 and PMOS Q5 is in the OUTFB pin of overvoltage protection chip U5, and switch access point SW1 is connected with resistance R17, resistance R14, resistance R15 is parallel to the grid of PMOS Q5, and the colelctor electrode c of audion Q1 is connected to resistance R15, resistance R19, resistance R16 is parallel to the base stage of audion Q1, diode D2, diode D3 is parallel to resistance R16, diode D2, Zener diode D4 is parallel to switch access point SW2, and resistance R18 is connected with diode D3, the positive pole of electrochemical capacitor C16, electric capacity C11, the Vin pins in parallel of three terminal integrated voltage stabilizer is in the drain electrode of PMOS Q5, and the Vout pin of three terminal integrated voltage stabilizer accesses the single-chip microcomputer in single chip circuit, the source electrode of NMOS tube Q3, electrochemical capacitor C19, resistance R10, the GND pin of overvoltage protection chip U5, electric capacity C18, the negative pole of electrochemical capacitor C17, the emitting stage of audion Q1, resistance R19, Zener diode D4, resistance R18, the negative pole of electrochemical capacitor C16, electric capacity C11, the GND pin ground connection of three terminal integrated voltage stabilizer.

Power circuit can by externally input 12V DC source, and gauge internal first passes through NMOS tube Q3 to identify whether power supply connects correctly, the NMOS tube Q3 cut-off when reverse power connection, to play the effect of protection back-end circuit. Outside easily changeable electric fuse F1 is adopted to prevent the excessive permanent damage that inside chip is caused of electric current; it is input to the 3rd foot of U5 by outer portion piezoresistance and determines the scope of overvoltage protection; such as; when voltage is more than 30V, end, by the NMOS tube Q3 controlling to be connected on U5 the 5th foot, the purpose realizing overvoltage protection. Adopt 78L05 to realize the conversion of 12V to 5V, it is provided that to the internal circuit of instrument simultaneously. The indirect button of SW1 and SW2 can realize key startup and shutdown, when push button SW1 or SW2 time, audion Q1 conducting makes system power supply, and single-chip microcomputer exports high level at PE15 and maintains the constant conduction of audion and realize start simultaneously; When again push button SW1 or SW2 time, single-chip microcomputer detects that PE14 is high level, drags down PE15 and makes audion end, and system is thus power-off.

In this utility model embodiment, weighing-up wave Acquisition Circuit 11 includes TVS diode D16, TVS diode D17, inducer L1, inducer L2, resistance R30, resistance R31, electric capacity C30, electric capacity C31, electric capacity C32, resistance R32, resistance R33, electric capacity C33, audion Q8, A/D conversion chip U7, resistance R4, electrochemical capacitor C6, electric capacity C7, for connecting the transducing signal receiving interface J3 of weighing-up wave harvester, and for connecting the interface microcontroller J2 of single-chip microcomputer, TVS diode D16 and inducer L1 are also connected to 3 feet of transducing signal receiving interface J3, TVS diode D17 and inducer L2 are also connected to 2 feet of transducing signal receiving interface J3, resistance R30 connects with inducer L1, resistance R31 connects with inducer L2, resistance R30 and electric capacity C30 is parallel to the INNA pin of A/D conversion chip U7, and resistance R31 and electric capacity C30 is parallel to the INPA pin of A/D conversion chip U7, electric capacity C31, resistance R32, the colelctor electrode of audion Q8 and 6 feet of transducing signal receiving interface J6 are parallel to the AVDD pin of A/D conversion chip U7, resistance R32 and resistance R33 is parallel to the VFEB pin of A/D conversion chip U7, electric capacity C31 and resistance R33 is parallel to the AGND pin of A/D conversion chip U7, electric capacity C31 and electric capacity C32 is parallel to the VBG pin of A/D conversion chip U7, the base stage of audion Q8 is connected with the BASE pin of A/D conversion chip U7, electric capacity C33, the emitter stage of audion Q8, resistance R4, electrochemical capacitor C6, electric capacity C7, 1 foot of interface microcontroller J2, the DVDD pins in parallel of A/D conversion chip U7 is in the VSUP pin of A/D conversion chip U7, and the RATE pin of A/D conversion chip U7 is connected to resistance R4, electrochemical capacitor C6, electric capacity C7 is parallel to 1 foot of interface microcontroller J2, the DOUT pin of A/D conversion chip U7 is serially connected with 2 feet of interface microcontroller J2, the PD_SCK pin of A/D conversion chip U7 is serially connected with 3 feet of interface microcontroller J2, the INPB pin of A/D conversion chip U7 is serially connected with the INNB pin of A/D conversion chip U7,1 foot of transducing signal receiving interface J3, TVS diode D16, TVS diode D17, electric capacity C31, resistance R33, electric capacity C32, the AGND pin of A/D conversion chip U7, electric capacity C33, electrochemical capacitor C6, electric capacity C7, resistance R4, 4 feet of interface microcontroller J2.

In this utility model embodiment, load cell signal first passes through TVS diode and restrains electrostatic and surge interference, then pass through magnetic bead and RC filters the passage A input entering high-precision A/D conversion chip U7 after signal is filtered process, single-chip microcomputer and A/D chip adopt serial communication, carry out corresponding computing after 24 bit data carry out limit filtration, average value filtering.

In this utility model embodiment, LED display module element circuit 13 includes LED drive chip U2, LED charactron DS1, LED charactron DS2, LED charactron DS3, LED charactron DS4, LED charactron DS5, LED charactron DS6, light emitting diode D11, light emitting diode D12, light emitting diode D13, light emitting diode D14, light emitting diode D15, resistance R5, resistance R6, resistance R7, electric capacity C5, and for being connected to the interface microcontroller J8, resistance R5 of single-chip microcomputer, resistance R6, resistance R7, electric capacity C5 is parallel to the VDD pin of LED drive chip U2, and the VDD pin of LED drive chip U2 and 5 feet of interface microcontroller J8 access the voltage VCC, resistance R5 that power circuit provides, 4 feet of interface microcontroller J8 are parallel to the DIO pin of LED drive chip U2, resistance R6, 3 feet of interface microcontroller J8 are parallel to the CLK pin of LED drive chip U2, resistance R7, 2 feet of interface microcontroller J8 are parallel to the STB pin of LED drive chip U2, light emitting diode D11, light emitting diode D12, light emitting diode D13, light emitting diode D14, light emitting diode D15 also ties the GR7 pin receiving LED drive chip U2, light emitting diode D11, the a pin of LED charactron DS1, the a pin of LED charactron DS2, the a pin of LED charactron DS3, the a pin of LED charactron DS4, the a pin of LED charactron DS5, the a pins in parallel of LED charactron DS6 is in the SEG1 pin of LED drive chip U2, light emitting diode D12, the b pin of LED charactron DS1, the b pin of LED charactron DS2, the b pin of LED charactron DS3, the b pin of LED charactron DS4, the b pin of LED charactron DS5, the b pins in parallel of LED charactron DS6 is in the SEG2 pin of LED drive chip U2, light emitting diode D13, the c pin of LED charactron DS1, the c pin of LED charactron DS2, the c pin of LED charactron DS3, the c pin of LED charactron DS4, the c pin of LED charactron DS5, the c pins in parallel of LED charactron DS6 is in the SEG3 pin of LED drive chip U2, light emitting diode D14, the d pin of LED charactron DS1, the d pin of LED charactron DS2, the d pin of LED charactron DS3, the d pin of LED charactron DS4, the d pin of LED charactron DS5, the d pins in parallel of LED charactron DS6 is in the SEG4 pin of LED drive chip U2, light emitting diode D15, the e pin of LED charactron DS1, the e pin of LED charactron DS2, the e pin of LED charactron DS3, the e pin of LED charactron DS4, the e pin of LED charactron DS5, the e pins in parallel of LED charactron DS6 is in the SEG5 pin of LED drive chip U2, the f pin of LED charactron DS1, the f pin of LED charactron DS2, the f pin of LED charactron DS3, the f pin of LED charactron DS4, the f pin of LED charactron DS5, the f pins in parallel of LED charactron DS6 is in the SEG6 pin of LED drive chip U2, the g pin of LED charactron DS1, the g pin of LED charactron DS2, the g pin of LED charactron DS3, the g pin of LED charactron DS4, the g pin of LED charactron DS5, the g pins in parallel of LED charactron DS6 is in the SEG8 pin of LED drive chip U2, the dp pin of LED charactron DS1, the dp pin of LED charactron DS2, the dp pin of LED charactron DS3, the dp pin of LED charactron DS4, the dp pin of LED charactron DS5, the dp pins in parallel of LED charactron DS6 is in the SEG7 pin of LED drive chip U2, LED charactron DS1 is connected to the GR6 foot of LED drive chip U2, LED charactron DS2 is connected to the GR5 foot of LED drive chip U2, LED charactron DS3 is connected to the GR4 foot of LED drive chip U2, LED charactron DS4 is connected to the GR3 foot of LED drive chip U2, LED charactron DS5 is connected to the GR2 foot of LED drive chip U2, and LED charactron DS6 is connected to the GR1 foot of LED drive chip U2, electric capacity C5, the GND pin of LED drive chip U2, the 1 foot ground connection of interface microcontroller J8.

In this utility model embodiment, LED display module circuit is received, by LED special driving chip U1, the digital signal that single-chip microcomputer sends over, carrying out decoding rear drive LED charactron and carry out the display of weight and parameter information, display lamp is used for indicating zero point, peeling, demarcation, stable, communication state.

In this utility model embodiment, communication interface circuit 14 includes electrical level transferring chip U3, bidirectional protective diode TVS4, bidirectional protective diode TVS5, electric capacity C24, electric capacity C23, electric capacity C22, electric capacity C21, electric capacity C20, inducer L3, inducer L5, resistance R24, resistance R25 and signal output interface J11, inducer L3 for outer signal reception equipment, resistance R24 is concatenated into 3 feet of signal output interface J11, and inducer L3 and bidirectional protective diode TVS4 is parallel to the R2IN pin of electrical level transferring chip U3, inducer L5, resistance R25 is concatenated into 2 feet of signal output interface J11, inducer L5 and bidirectional protective diode TVS5 is parallel to the T2OUT pin of electrical level transferring chip U3, electric capacity C20 is series between the C1+ pin of electrical level transferring chip U3 and the C1-pin of electrical level transferring chip U3, electric capacity C21 is series between the C2+ pin of electrical level transferring chip U3 and the C2-pin of electrical level transferring chip U3, electric capacity C22 is series at the V-pin of electrical level transferring chip U3, electric capacity C23 is series between V+ pin and the VCC pin of electrical level transferring chip U3 of electrical level transferring chip U3, the VCC pin of electric capacity C23 and electrical level transferring chip U3 is parallel to 5 feet of electric capacity C24, signal output interface J11, bidirectional protective diode TVS4, bidirectional protective diode TVS5, electric capacity C22, the GND pin of electrical level transferring chip U3, electric capacity C24 ground connection.

In this utility model embodiment, RS232 communication interface circuit is with electrical level transferring chip U3 for core, it is achieved Transistor-Transistor Logic level to the conversion of RS232 level, completes single-chip data uploading to PC or other equipment. Interface realizes warm swap, overvoltage, the surge protection of overcurrent by TVS diode.

In this utility model embodiment, SCM peripheral circuit 12 includes single-chip microcomputer U1, storage chip U4, electric capacity C1, electric capacity C2, electric capacity C3, electrochemical capacitor C4, electric capacity C25, electric capacity C100, electric capacity C101, electric capacity C102, electric capacity C103, electric capacity C104, weighing-up wave Acquisition Circuit interface J14, LED display module element circuit interface J4, keyboard and switch interface JP for external connection keyboard and switch, resistance R1, resistance R2, resistance R3, audion Q2, resistance R100, resistance R101, resistance R102, resistance R103, resistance R104, button access point KEY1, button access point KEY2, button access point KEY3, button access point KEY4, button access point KEY5, buzzer BZ1 and crystal oscillator Y1, the emitter stage of audion Q2 connects the power circuit providing voltage VCC, the base stage of audion Q2 is connected to the P1.0 pin of single-chip microcomputer U1 by resistance R3, and the colelctor electrode of audion Q2 is connected to the A0 pin of buzzer BZ1, storage chip U4, the A1 pin of storage chip U4, the A2 pin of storage chip U4, the VSS pin of storage chip U4 and the WP pins in parallel of storage chip U4 are in electric capacity C25, electric capacity C25 is serially connected with the VDD pin of storage chip U4, the VDD pin of storage chip U4 connects the power circuit providing voltage VCC, the P0.4 pins in parallel of resistance R1 and single-chip microcomputer U1 is in the SDA pin of storage chip U4, the P0.3 pins in parallel of resistance R2 and single-chip microcomputer U1 is in the SCL pin of storage chip U4, resistance R1 and resistance R2 is parallel to the power circuit providing voltage VCC, electric capacity C1, crystal oscillator Y1 is parallel to the XTAL2 pin of single-chip microcomputer U1, electric capacity C2, crystal oscillator Y1 is parallel to the XTAL1 pin of single-chip microcomputer U1, and electric capacity C3 and electrochemical capacitor C4 is parallel to the VCC pin of single-chip microcomputer U1, and the VCC pin of single-chip microcomputer U1 connects the power circuit providing voltage VCC, resistance R100, resistance R101, resistance R102, resistance R103 and resistance R104 is parallel to the power circuit providing voltage VCC, electric capacity C100 and resistance R100 is parallel to button access point KEY1, electric capacity C101 and resistance R101 is parallel to button access point KEY2, electric capacity C102 and resistance R102 is parallel to button access point KEY3, electric capacity C103 and resistance R103 is parallel to button access point KEY4, electric capacity C104 and resistance R104 is parallel to button access point KEY5, electric capacity C100, electric capacity C101, electric capacity C102, parallel connection between electric capacity C103 and electric capacity C104, switch access point SW1 is connected to 1 foot of keyboard and switch interface JP, switch access point SW2 is connected to 2 feet of keyboard and switch interface JP, button access point KEY1 is connected to 3 feet of keyboard and switch interface JP and the P1.3 pin of single-chip microcomputer U1, button access point KEY2 is connected to 4 feet of keyboard and switch interface JP and the P1.4 pin of single-chip microcomputer U1, button access point KEY3 is connected to 5 feet of keyboard and switch interface JP and the P1.5 pin of single-chip microcomputer U1, button access point KEY4 is connected to 6 feet of keyboard and switch interface JP and the P1.6 pin of single-chip microcomputer U1, button access point KEY5 is connected to 7 feet of keyboard and switch interface JP and the P1.7 pin of single-chip microcomputer U1, 5 feet of LED display module element circuit interface J4 and 4 feet of weighing-up wave Acquisition Circuit interface J14 are connected to the power circuit providing voltage VCC, 4 feet of LED display module element circuit interface J4 are connected to the P0.0 pin of single-chip microcomputer U1, 3 feet of LED display module element circuit interface J4 are connected to the P0.1 pin of single-chip microcomputer U1, 2 feet of LED display module element circuit interface J4 are connected to the P0.2 pin of single-chip microcomputer U1, 3 feet of weighing-up wave Acquisition Circuit interface J14 are connected to the P1.2 pin of single-chip microcomputer U1, 2 feet of weighing-up wave Acquisition Circuit interface J14 are connected to the P1.1 pin of single-chip microcomputer U1, buzzer BZ1, the A0 pin of storage chip U4, the A1 pin of storage chip U4, the A2 pin of storage chip U4, the VSS pin of storage chip U4, the WP pin of storage chip U4, electric capacity C25, electric capacity C100, electric capacity C101, electric capacity C102, electric capacity C103, electric capacity C104, 8 feet of keyboard and switch interface JP, 1 foot of weighing-up wave Acquisition Circuit interface J14, 1 foot of LED display module element circuit interface J4, electric capacity C1, electric capacity C2, electric capacity C3, electrochemical capacitor C4, and the GND pin ground connection of single-chip microcomputer U1.

In this utility model embodiment, single-chip microcomputer U1 can be selected for STC12C5A32S2, and its peripheral circuit comprises crystal oscillator, keyboard, EEPROM, buzzer. Realize single-chip microcomputer to work normally, reception simultaneously processes A/D chip and returns the digital signal of coming, calculating is delivered to LED drive chip and is carried out decoding and showing after completing, the operation of response external switch key simultaneously, realize switching on and shutting down, demarcate weight and the parameter such as scale division value, decimal place is set, can realize resetting, removing the peel simultaneously. Outside EEPROM is used for preserving button and arranges parameter and demarcate weight data. It addition, buzzer BZ1 is for outranging alarm prompting.

In this utility model embodiment, as shown in Figure 7, signal output interface J11 is positioned in a kind of waterproof construction, waterproof construction includes waterproof case 01 and sealing ring 02, waterproof case 01 is provided with the water joint fixing hole 03 for placing signal output interface J11, classification of waterproof can be IP65, take into full account water-proof function, sealing ring is placed at the position being connected with upper cover, on the jack of wiring, also select water joint simultaneously, effectively solve the inaccurate problem of weighing owing to water inlet causes.

Resistance strain weighing transducer signal can be carried out high precision collecting, filtering, conversion, shows, upload by the weighing instrument that this utility model embodiment provides, capacity of resisting disturbance is strong, improve the stability of measurement system, reliability and certainty of measurement, adapt to industry spot strong electromagnetic environment. Input on power supply input, hardware, output channel have all designed protection circuit, thus not only increasing the safety of host computer system, and improve the jamproof ability of input channel. Properties of product are reliable, and weighing precision is high, good stability, and fault is few, compact conformation, and area occupied is few, it is easy to install and safeguard, have more washability to select for user. Be applicable to platform balance, the fixed-site such as on-ground weigher, container claim, truck scale, can be used under the mobile environment such as feed-stuff mixer or automatic blending car, this utility model embodiment, in power input, the power-supply fluctuation having fully taken into account vehicular power-bottle, devises reversal connection, overvoltage, current foldback circuit; Increase TVS diode in load cell signal input and restrain electrostatic and surge interference; RS232 interface is prevented from warm swap, overvoltage, and overcurrent etc. is impacted.

Module or unit in this utility model embodiment device can merge according to actual needs, divide and delete.

Above disclosed it is only this utility model preferred embodiment, certainly the interest field of this utility model can not be limited with this, one of ordinary skill in the art will appreciate that all or part of flow process realizing above-described embodiment, and according to the equivalent variations that this utility model claim is made, still fall within the scope that utility model contains.

Claims (7)

1. a weighing instrument, it is characterized in that, including: power circuit, weighing-up wave Acquisition Circuit, SCM peripheral circuit, LED display module element circuit, communication interface circuit, switch key and external memory storage, described weighing-up wave Acquisition Circuit, described LED display module element circuit, described communication interface circuit, described switch key and described external memory storage are electrically connected to the single-chip microcomputer in described SCM peripheral circuit, described power circuit includes the prime power input power interface for accessing vehicle power, and for connecting the rear class output end power interface of the described single-chip microcomputer in described SCM peripheral circuit.

2. weighing instrument as claimed in claim 1, it is characterised in that described power circuit includes NMOS tube Q3, NMOS tube Q4, PMOS Q5, overvoltage protection chip U5, switch access point SW1, switch access point SW2, diode D2, diode D3, Zener diode D4, electric capacity C11, electrochemical capacitor C16, electrochemical capacitor C17, electric capacity C18, electrochemical capacitor C19, audion Q1, resistance R8, resistance R9, resistance R10, resistance R14, resistance R15, resistance R16, resistance R17, resistance R18, resistance R19, electric fuse F1, three terminal integrated voltage stabilizer forms, the drain electrode of described NMOS tube Q3 connects the negative pole of described vehicle power, described electric fuse F1 and described resistance R8 is parallel to the positive pole of described vehicle power, and the grid of described NMOS tube Q3 connects described resistance R8, the positive pole of described electrochemical capacitor C19, described resistance R9, the IN pin of described overvoltage protection chip U5, the SHDN pin of described overvoltage protection chip U5, and the drain electrode of described NMOS tube Q4 be connected to described electric fuse F1, described resistance R9 and described resistance R10 is parallel to the OVSET pin of described overvoltage protection chip U5, the grid of described NMOS tube Q4 and described electric capacity C18 are also connected to the GATE pin of described overvoltage protection chip U5, the source electrode of described NMOS tube Q4, the positive pole of described electrochemical capacitor C17, described resistance R14, the sources connected in parallel of described resistance R17 and described PMOS Q5 is in the OUTFB pin of described overvoltage protection chip U5, and described switch access point SW1 is connected with described resistance R17, described resistance R14, described resistance R15 is parallel to the grid of described PMOS Q5, and the colelctor electrode c of described audion Q1 is connected to described resistance R15, described resistance R19, described resistance R16 is parallel to the base stage of described audion Q1, described diode D2, described diode D3 is parallel to described resistance R16, described diode D2, described Zener diode D4 is parallel to described switch access point SW2, and described resistance R18 is connected with described diode D3, the positive pole of described electrochemical capacitor C16, described electric capacity C11, the Vin pins in parallel of described three terminal integrated voltage stabilizer is in the drain electrode of described PMOS Q5, and the Vout pin of described three terminal integrated voltage stabilizer accesses the described single-chip microcomputer in described single chip circuit, the source electrode of described NMOS tube Q3, described electrochemical capacitor C19, described resistance R10, the GND pin of described overvoltage protection chip U5, described electric capacity C18, the negative pole of described electrochemical capacitor C17, the emitting stage of described audion Q1, described resistance R19, described Zener diode D4, described resistance R18, the negative pole of described electrochemical capacitor C16, described electric capacity C11, the GND pin ground connection of described three terminal integrated voltage stabilizer.

3. weighing instrument as claimed in claim 1, it is characterised in that described weighing-up wave Acquisition Circuit includes TVS diode D16, TVS diode D17, inducer L1, inducer L2, resistance R30, resistance R31, electric capacity C30, electric capacity C31, electric capacity C32, resistance R32, resistance R33, electric capacity C33, audion Q8, A/D conversion chip U7, resistance R4, electrochemical capacitor C6, electric capacity C7, for connecting the transducing signal receiving interface J3 of weighing-up wave harvester, and for connecting the interface microcontroller J2 of described single-chip microcomputer, described TVS diode D16 and described inducer L1 are also connected to 3 feet of described transducing signal receiving interface J3, described TVS diode D17 and described inducer L2 are also connected to 2 feet of described transducing signal receiving interface J3, described resistance R30 connects with described inducer L1, described resistance R31 connects with described inducer L2, described resistance R30 and described electric capacity C30 is parallel to the INNA pin of described A/D conversion chip U7, described resistance R31 and described electric capacity C30 is parallel to the INPA pin of described A/D conversion chip U7, described electric capacity C31, described resistance R32, the colelctor electrode of described audion Q8 and 6 feet of described transducing signal receiving interface J6 are parallel to the AVDD pin of described A/D conversion chip U7, described resistance R32 and described resistance R33 is parallel to the VFEB pin of described A/D conversion chip U7, described electric capacity C31 and described resistance R33 is parallel to the AGND pin of described A/D conversion chip U7, described electric capacity C31 and described electric capacity C32 is parallel to the VBG pin of described A/D conversion chip U7, the base stage of described audion Q8 is connected with the BASE pin of described A/D conversion chip U7, described electric capacity C33, the emitter stage of described audion Q8, described resistance R4, described electrochemical capacitor C6, described electric capacity C7, 1 foot of described interface microcontroller J2, the DVDD pins in parallel of described A/D conversion chip U7 is in the VSUP pin of described A/D conversion chip U7, and the RATE pin of described A/D conversion chip U7 is connected to described resistance R4, described electrochemical capacitor C6, described electric capacity C7 is parallel to 1 foot of described interface microcontroller J2, the DOUT pin of described A/D conversion chip U7 is serially connected with 2 feet of described interface microcontroller J2, the PD_SCK pin of described A/D conversion chip U7 is serially connected with 3 feet of described interface microcontroller J2, the INPB pin of described A/D conversion chip U7 is serially connected with the INNB pin of described A/D conversion chip U7,1 foot of described transducing signal receiving interface J3, described TVS diode D16, described TVS diode D17, described electric capacity C31, described resistance R33, described electric capacity C32, the AGND pin of described A/D conversion chip U7, described electric capacity C33, described electrochemical capacitor C6, described electric capacity C7, described resistance R4, 4 feet of described interface microcontroller J2.

4. weighing instrument as claimed in claim 1, it is characterised in that described LED display module element circuit includes LED drive chip U2, LED charactron DS1, LED charactron DS2, LED charactron DS3, LED charactron DS4, LED charactron DS5, LED charactron DS6, light emitting diode D11, light emitting diode D12, light emitting diode D13, light emitting diode D14, light emitting diode D15, resistance R5, resistance R6, resistance R7, electric capacity C5, and for being connected to the interface microcontroller J8, described resistance R5 of described single-chip microcomputer, described resistance R6, described resistance R7, described electric capacity C5 is parallel to the VDD pin of described LED drive chip U2, and the VDD pin of described LED drive chip U2 and 5 feet of described interface microcontroller J8 access the voltage VCC, described resistance R5 that described power circuit provides, 4 feet of described interface microcontroller J8 are parallel to the DIO pin of described LED drive chip U2, described resistance R6, 3 feet of described interface microcontroller J8 are parallel to the CLK pin of described LED drive chip U2, described resistance R7, 2 feet of described interface microcontroller J8 are parallel to the STB pin of described LED drive chip U2, described light emitting diode D11, described light emitting diode D12, described light emitting diode D13, described light emitting diode D14, described light emitting diode D15 also ties the GR7 pin receiving described LED drive chip U2, described light emitting diode D11, the a pin of described LED charactron DS1, the a pin of described LED charactron DS2, the a pin of described LED charactron DS3, the a pin of described LED charactron DS4, the a pin of described LED charactron DS5, the a pins in parallel of LED charactron DS6 is in the SEG1 pin of described LED drive chip U2, described light emitting diode D12, the b pin of described LED charactron DS1, the b pin of described LED charactron DS2, the b pin of described LED charactron DS3, the b pin of described LED charactron DS4, the b pin of described LED charactron DS5, the b pins in parallel of LED charactron DS6 is in the SEG2 pin of described LED drive chip U2, described light emitting diode D13, the c pin of described LED charactron DS1, the c pin of described LED charactron DS2, the c pin of described LED charactron DS3, the c pin of described LED charactron DS4, the c pin of described LED charactron DS5, the c pins in parallel of LED charactron DS6 is in the SEG3 pin of described LED drive chip U2, described light emitting diode D14, the d pin of described LED charactron DS1, the d pin of described LED charactron DS2, the d pin of described LED charactron DS3, the d pin of described LED charactron DS4, the d pin of described LED charactron DS5, the d pins in parallel of LED charactron DS6 is in the SEG4 pin of described LED drive chip U2, described light emitting diode D15, the e pin of described LED charactron DS1, the e pin of described LED charactron DS2, the e pin of described LED charactron DS3, the e pin of described LED charactron DS4, the e pin of described LED charactron DS5, the e pins in parallel of LED charactron DS6 is in the SEG5 pin of described LED drive chip U2, the f pin of described LED charactron DS1, the f pin of described LED charactron DS2, the f pin of described LED charactron DS3, the f pin of described LED charactron DS4, the f pin of described LED charactron DS5, the f pins in parallel of LED charactron DS6 is in the SEG6 pin of described LED drive chip U2, the g pin of described LED charactron DS1, the g pin of described LED charactron DS2, the g pin of described LED charactron DS3, the g pin of described LED charactron DS4, the g pin of described LED charactron DS5, the g pins in parallel of LED charactron DS6 is in the SEG8 pin of described LED drive chip U2, the dp pin of described LED charactron DS1, the dp pin of described LED charactron DS2, the dp pin of described LED charactron DS3, the dp pin of described LED charactron DS4, the dp pin of described LED charactron DS5, the dp pins in parallel of LED charactron DS6 is in the SEG7 pin of described LED drive chip U2, described LED charactron DS1 is connected to the GR6 foot of described LED drive chip U2, described LED charactron DS2 is connected to the GR5 foot of described LED drive chip U2, described LED charactron DS3 is connected to the GR4 foot of described LED drive chip U2, described LED charactron DS4 is connected to the GR3 foot of described LED drive chip U2, described LED charactron DS5 is connected to the GR2 foot of described LED drive chip U2, described LED charactron DS6 is connected to the GR1 foot of described LED drive chip U2, described electric capacity C5, the GND pin of described LED drive chip U2, the 1 foot ground connection of described interface microcontroller J8.

5. weighing instrument as claimed in claim 1, it is characterised in that described communication interface circuit includes electrical level transferring chip U3, bidirectional protective diode TVS4, bidirectional protective diode TVS5, electric capacity C24, electric capacity C23, electric capacity C22, electric capacity C21, electric capacity C20, inducer L3, inducer L5, resistance R24, resistance R25 and signal output interface J11, described inducer L3 for outer signal reception equipment, described resistance R24 is concatenated into 3 feet of described signal output interface J11, and described inducer L3 and described bidirectional protective diode TVS4 is parallel to the R2IN pin of described electrical level transferring chip U3, described inducer L5, described resistance R25 is concatenated into 2 feet of described signal output interface J11, described inducer L5 and described bidirectional protective diode TVS5 is parallel to the T2OUT pin of described electrical level transferring chip U3, described electric capacity C20 is series between the C1+ pin of described electrical level transferring chip U3 and the C1-pin of described electrical level transferring chip U3, described electric capacity C21 is series between the C2+ pin of described electrical level transferring chip U3 and the C2-pin of described electrical level transferring chip U3, described electric capacity C22 is series at the V-pin of described electrical level transferring chip U3, described electric capacity C23 is series between the V+ pin of described electrical level transferring chip U3 and the VCC pin of described electrical level transferring chip U3, the VCC pin of described electric capacity C23 and described electrical level transferring chip U3 is parallel to described electric capacity C24,5 feet of described signal output interface J11, described bidirectional protective diode TVS4, described bidirectional protective diode TVS5, described electric capacity C22, the GND pin of described electrical level transferring chip U3, described electric capacity C24 ground connection.

6. weighing instrument as claimed in claim 5, it is characterized in that, described signal output interface J11 is positioned in a kind of waterproof construction, and described waterproof construction includes waterproof case and sealing ring, and described waterproof case is provided with the water joint fixing hole for placing described signal output interface J11.

7. the weighing instrument as described in any one of claim 1-5, it is characterised in that described SCM peripheral circuit includes single-chip microcomputer U1, storage chip U4, electric capacity C1, electric capacity C2, electric capacity C3, electric capacity C4, electric capacity C25, electric capacity C100, electric capacity C101, electric capacity C102, electric capacity C103, electric capacity C104, weighing-up wave Acquisition Circuit interface J14, LED display module element circuit interface J4, keyboard and switch interface JP for external connection keyboard and switch, resistance R1, resistance R2, resistance R3, audion Q2, resistance R100, resistance R101, resistance R102, resistance R103, resistance R104, button access point KEY1, button access point KEY2, button access point KEY3, button access point KEY4, button access point KEY5, buzzer BZ1 and crystal oscillator Y1, the emitter stage of described audion Q2 connects the described power circuit providing voltage VCC, the base stage of described audion Q2 is connected to the P1.0 pin of described single-chip microcomputer U1 by described resistance R3, the colelctor electrode of described audion Q2 is connected to described buzzer BZ1, the A0 pin of described storage chip U4, the A1 pin of described storage chip U4, the A2 pin of described storage chip U4, the VSS pin of described storage chip U4 and the WP pins in parallel of described storage chip U4 are in described electric capacity C25, described electric capacity C25 is serially connected with the VDD pin of described storage chip U4, the VDD pin of described storage chip U4 connects the described power circuit providing voltage VCC, the P0.4 pins in parallel of described resistance R1 and described single-chip microcomputer U1 is in the SDA pin of described storage chip U4, the P0.3 pins in parallel of described resistance R2 and described single-chip microcomputer U1 is in the SCL pin of described storage chip U4, described resistance R1 and described resistance R2 is parallel to the described power circuit providing voltage VCC, described electric capacity C1, described crystal oscillator Y1 is parallel to the XTAL2 pin of described single-chip microcomputer U1, described electric capacity C2, described crystal oscillator Y1 is parallel to the XTAL1 pin of described single-chip microcomputer U1, and described electric capacity C3 and described electric capacity C4 is parallel to the VCC pin of described single-chip microcomputer U1, and the VCC pin of described single-chip microcomputer U1 connects the described power circuit providing voltage VCC, described resistance R100, described resistance R101, described resistance R102, described resistance R103 and described resistance R104 is parallel to the described power circuit providing voltage VCC, described electric capacity C100 and described resistance R100 is parallel to described button access point KEY1, described electric capacity C101 and described resistance R101 is parallel to described button access point KEY2, described electric capacity C102 and described resistance R102 is parallel to described button access point KEY3, described electric capacity C103 and described resistance R103 is parallel to described button access point KEY4, described electric capacity C104 and described resistance R104 is parallel to described button access point KEY5, described electric capacity C100, described electric capacity C101, described electric capacity C102, parallel connection between described electric capacity C103 and described electric capacity C104, described switch access point SW1 is connected to 1 foot of described keyboard and switch interface JP, described switch access point SW2 is connected to 2 feet of described keyboard and switch interface JP, described button access point KEY1 is connected to 3 feet of described keyboard and switch interface JP and the P1.3 pin of described single-chip microcomputer U1, described button access point KEY2 is connected to 4 feet of described keyboard and switch interface JP and the P1.4 pin of described single-chip microcomputer U1, described button access point KEY3 is connected to 5 feet of described keyboard and switch interface JP and the P1.5 pin of described single-chip microcomputer U1, described button access point KEY4 is connected to 6 feet of described keyboard and switch interface JP and the P1.6 pin of described single-chip microcomputer U1, described button access point KEY5 is connected to 7 feet of described keyboard and switch interface JP and the P1.7 pin of described single-chip microcomputer U1, 5 feet of described LED display module element circuit interface J4 and 4 feet of described weighing-up wave Acquisition Circuit interface J14 are connected to the described power circuit providing voltage VCC, 4 feet of described LED display module element circuit interface J4 are connected to the P0.0 pin of described single-chip microcomputer U1, 3 feet of described LED display module element circuit interface J4 are connected to the P0.1 pin of described single-chip microcomputer U1, 2 feet of described LED display module element circuit interface J4 are connected to the P0.2 pin of described single-chip microcomputer U1, 3 feet of described weighing-up wave Acquisition Circuit interface J14 are connected to the P1.2 pin of described single-chip microcomputer U1, 2 feet of described weighing-up wave Acquisition Circuit interface J14 are connected to the P1.1 pin of described single-chip microcomputer U1, described buzzer BZ1, the A0 pin of described storage chip U4, the A1 pin of described storage chip U4, the A2 pin of described storage chip U4, the VSS pin of described storage chip U4, the WP pin of described storage chip U4, described electric capacity C25, described electric capacity C100, described electric capacity C101, described electric capacity C102, described electric capacity C103, described electric capacity C104, 8 feet of described keyboard and switch interface JP, 1 foot of described weighing-up wave Acquisition Circuit interface J14, 1 foot of described LED display module element circuit interface J4, described electric capacity C1, described electric capacity C2, described electric capacity C3, described electric capacity C4, and the GND pin ground connection of described single-chip microcomputer U1.