CN201527304U - Electronic weighing instrument anti-cheating device - Google Patents
Electronic weighing instrument anti-cheating device Download PDFInfo
- Publication number
- CN201527304U CN201527304U CN2009201280042U CN200920128004U CN201527304U CN 201527304 U CN201527304 U CN 201527304U CN 2009201280042 U CN2009201280042 U CN 2009201280042U CN 200920128004 U CN200920128004 U CN 200920128004U CN 201527304 U CN201527304 U CN 201527304U
- Authority
- CN
- China
- Prior art keywords
- signal
- chip
- output terminal
- input
- main control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Emergency Protection Circuit Devices (AREA)
Abstract
An electronic weighing instrument anti-cheating device comprises an amplifying circuit, an analog-to-digital conversion chip, a master control chip, a memory and an alarm, wherein the amplifying circuit is provided with a first detecting end a and a second detecting end b, the output end of the amplifying circuit is connected with the input end of the analog-to-digital conversion chip; the output end of the analog-to-digital conversion chip is connected with the input end of the master control chip; the input end/output end of the master control chip is connected with the input end/output end of the memory; and the output end of the master control chip is connected with the input end of the alarm. The electronic weighing instrument anti-cheating device is characterized by being also provided with a first power-off switch and a second power-off switch, and has following obvious effects: quickly and accurately detecting if the anti-cheating device is installed in the electronic weighing instrument and also quickly detecting the newly generated anti-cheating mode that a power supply or an adjustable resistor is bridged between the two input cables.
Description
Technical field
The utility model belongs to the electronic scale pick-up unit, specifically, relates to a kind of electronic scale anti-cheating device of judging whether electronic scale practises fraud.
Background technology
Electronic scale is made up of LOAD CELLS and electronic-weighing instrument two parts, and LOAD CELLS detects tested weight, and the electronic-weighing instrument shows weighing results.Electrical measurement formula electronic scale is divided into two kinds: analog and digital.As shown in Figure 3, the LOAD CELLS of analog electronic scale is the electronic scale resistance bridge (R) that is made of resistance R 1, R2, R3, R4, during electronic scale work, provide constant voltage to LOAD CELLS, during bridge balancing, LOAD CELLS provides constant electric current by two input cables to the electronic-weighing instrument;
At present, for analog electronic scale, the cribber adds voltage-regulation resistance usually between the input stube cable of electronic-weighing instrument and LOAD CELLS, the resistance R 0 of promptly practising fraud, perhaps on any resistance of bridge circuit and connect cheating resistance,, change original balanced structure of LOAD CELLS bridge circuit by the resistance of remote control cheating resistance, the displayed value of electronic-weighing instrument and the actual weight of object are not inconsistent, reach the cheating effect; For digital electronic weighing apparatus, the cribber is installed cheating device additional usually between the I/O cable between electronic-weighing instrument and LOAD CELLS, changes the weight data that sends to the electronic-weighing instrument, reaches the effect of cheating.At these two kinds of fraudulent meanses, the anti-remote control cheating device (patent No.: ZL200820097567.5) of existing a kind of electrical measurement formula electronic scale, this anti-cheating device comprises amplifying circuit, modulus conversion chip, main control chip, storer and alarm, wherein amplifying circuit is provided with first test side and second test side, amplifying circuit amplifies the signal of input, the output terminal of this amplifying circuit is connected with the input end of modulus conversion chip, modulus conversion chip becomes digital signal to the analog signal conversion of input, and be transferred to main control chip, main control chip reads initialize data from storer, and to the input digital signal data and initialize data compare, if cheating, main control chip output terminal output alarm signal drives alarm and reports to the police, thereby reaches the purpose of prevention cheating.
The new mode of cheating that has occurred cross-over connection power supply or adjustable resistance between two input cables at present, shown in Fig. 4,5, the voltage of input end reduces to weigh, regulate adjustable resistance resistance or supply voltage value, just can change the weight data that sends to the electronic-weighing instrument, the size when but the size of current of the input cable between electronic-weighing instrument and LOAD CELLS can be adjusted to no cheating device is not detected by anti-cheating pick-up unit, thereby reaches the purpose of cheating.
The defective of prior art is: can not the cheating mode of cross-over connection power supply or adjustable resistance between two input cables be detected.
The utility model content
The purpose of this utility model provides a kind of electronic scale anti-cheating device, can detect quickly and accurately whether cheating device has been installed in the electronic scale, to emerging between two input cables the cheating mode of cross-over connection power supply or adjustable resistance also can detect.
For achieving the above object, the utility model is explained a kind of electronic scale anti-cheating device, comprise amplifying circuit, modulus conversion chip, main control chip, storer and alarm, wherein amplifying circuit is provided with the first test side a and the second test side b, the output terminal of this amplifying circuit is connected with the input end of modulus conversion chip, the output terminal of this modulus conversion chip is connected with the input end of main control chip, the I/O end of this main control chip is connected with the I/O end of storer, the output terminal of this main control chip is connected with the input end of alarm, it is characterized in that: also be provided with first cut-off switch and second cut-off switch.
Described first cut-off switch is connected across electronic scale resistance bridge first output terminal and first and weighs between the input end, and described second cut-off switch is connected across second output terminal and second of electronic scale resistance bridge and weighs between the input end.
The first test side a and the second test side b are connected on the input cable between electronic scale resistance bridge and the electronic-weighing instrument, if two input cable spans are connected to the cheating power supply, first cut-off switch and second cut-off switch have disconnected the power supply of LOAD CELLS, under the normal condition, between the two input cables is not have power supply, if but the first test side a and the second test side b have detected electric signal, just prove that two input cable spans are connected to the cheating power supply.
Also be provided with the 3rd power switch and the 4th power switch.
Cross-over connection the 3rd power switch between the first input end of described electronic scale resistance bridge and the direct supply high-pressure side, cross-over connection the 4th power switch between second input end of electronic scale resistance bridge and the ground wire of direct supply.
After the power supply that has disconnected LOAD CELLS, connect the 3rd power switch and the 4th power switch, the 3rd power switch and the 4th power switch provide a reliable and stable direct supply for the electronic scale resistance bridge, whether the electronic scale anti-cheating device is accurate by the current signal that the first test side a and the second test side b detect this electronic scale resistance bridge, if between the first test side a and the second test side b except that the electronic scale resistance bridge, the resistance of practising fraud in addition, then influence the first test side a and the detected signal of the second test side b, just can be judged as cross-over connection has cheating resistance.
This electronic scale anti-cheating device, under the prerequisite that does not influence the electronic scale operate as normal, can detect quickly and accurately whether cheating device has been installed in the electronic scale, to emerging between two input cables the cheating mode of cross-over connection power supply or adjustable resistance also can detect, cheating is in time reported to the police.
The signal input anode of described amplifying circuit is connected the described first test side a and the second test side b respectively with signal input negative terminal, and the amplifying signal output terminal of this amplifying circuit is connected with the signal input part of described modulus conversion chip.
Described modulus conversion chip is provided with input end of analog signal, oppositely sheet selects end, first digital signal output end and second digital signal output end, wherein input end of analog signal connects described amplifying circuit, and the reverse sheet choosing end of this modulus conversion chip, first digital signal output end all are connected with described main control chip with second digital signal output end.
Described main control chip is provided with the first I/O end group and the second I/O end group, and first signal input part of this main control chip, secondary signal input end, the 3rd signal input part are connected with chip selection signal end, first signal output part and the secondary signal output terminal of described modulus conversion chip respectively;
Described main control chip is provided with the first chip selection signal output terminal, clock signal output terminal, the first signal I/O end, secondary signal I/O end and is connected with chip selection signal end, clock signal terminal, the first data I/O end, the second data I/O end of described storer respectively;
Described main control chip also is provided with first signal output part and is connected with described alarm with the secondary signal output terminal.
Described alarm is provided with driver, relay and loudspeaker, first driving signal input of this driver and second driving signal input are connected first signal output part and the secondary signal output terminal of described main control chip respectively, and this first drive output is connected with loudspeaker with described relay respectively with second drive output.
Cheating device is installed in electronic scale, and when using electronic scale, main control chip first signal output part and secondary signal output terminal are all exported control signal, by driver, and control loudspeaker work, loudspeaker is reported to the police.
Described anti-cheating device also is provided with interface chip, display and keyboard, and the 3rd I/O end of described main control chip, the 3rd signal output part, the 4th signal output part, the second chip selection signal output terminal, the 5th signal output part, external interrupt end, address latch allow signal end, reset terminal to hold, read control end, ask bus access control end, clock signal terminal, reset terminal to be connected with input/output signal end, first signal input part, secondary signal input end, the sheet choosing of described interface chip respectively;
Described interface chip also is provided with first and shows that output terminal, second shows output terminal, shows that with described display first input end, second shows that input end is connected respectively;
If the electronic scale that detects is equipped with cheating device, described display is the luminous warning of LED digital display pipe, and the prompting electronic scale is equipped with cheating device, if the not cheating of this electronic scale, then this LED digital display pipe is not luminous.
Described keyboard is provided with first output terminal and second output terminal, and this first output terminal is connected with the second initialize data end with the first initialize data end of described interface chip respectively with second output terminal.
By described keyboard, can change default value in the described storer to described main control chip input default value, realize the cheating under the different situations is detected.
Remarkable result of the present utility model is: a kind of highly sensitive electronic scale anti-cheating device is provided, it can be under the prerequisite that does not influence the electronic scale operate as normal, detect quickly and accurately whether cheating device has been installed in the electronic scale, to emerging between two input cables the cheating mode of cross-over connection power supply or adjustable resistance can detect equally.If the electronic scale that detects cheating can disconnect the LOAD CELLS and the electronic-weighing instrument of this electronic scale simultaneously by acoustic alarm and light warning dual mode prompting tester, stop electronic scale work.
Description of drawings
Fig. 1 is a structured flowchart of the present utility model;
Fig. 2 is the circuit diagram of the utility model signal processing apparatus;
Fig. 3 is normal electronic scale circuit diagram;
Fig. 4 is the circuit diagram of cross-over connection power supply cheating;
Fig. 5 is the circuit diagram of cross-over connection cheating resistance.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
As shown in Figure 1, a kind of electronic scale anti-cheating device, comprise amplifying circuit 1, modulus conversion chip 2, main control chip 3, storer 4 and alarm 5, wherein amplifying circuit 1 is provided with the first test side a and the second test side b, the output terminal of this amplifying circuit 1 is connected with the input end of modulus conversion chip 2, the output terminal of this modulus conversion chip 2 is connected with the input end of main control chip 3, the I/O end of this main control chip 3 is connected with the I/O end of storer 4, the output terminal of this main control chip 3 is connected with the input end of alarm 5, it is characterized in that: also be provided with the first cut-off switch J1 and the second cut-off switch J2.
Also be provided with the 3rd power switch J3 and the 4th power switch J4.
As shown in Figure 2, the signal input anode RS+ of described amplifying circuit 1 is connected the described first test side a and the second test side b respectively with signal input negative terminal RS-, and the amplifying signal output terminal OUT of this amplifying circuit 1 is connected with the signal input part of described modulus conversion chip 2.
Described modulus conversion chip 2 is provided with input end of analog signal AIN1, oppositely CS, the first digital signal output end SDI and the second digital signal output end SDO are held in the sheet choosing, wherein input end of analog signal AIN1 connects described amplifying circuit 1, and reverse sheet choosing end CS, the first digital signal output end SDI of this modulus conversion chip 2 are connected with described main control chip 3 with the second digital signal output end SDO.
Described main control chip 3 is provided with first I/O end group P1.0～P1.7 and second I/O end group P2.0～P2.7, and the first signal input part P1.0 of this main control chip 3, secondary signal input end P1.1, the 3rd signal input part P1.2 are connected with secondary signal output terminal SDO with chip selection signal end CS, the first signal output part SDI of described modulus conversion chip 2 respectively;
Described main control chip 3 is provided with the first chip selection signal output terminal P1.5, clock signal output terminal P1.6, the first signal I/O end P1.7, secondary signal I/O end P2.0 and is connected with chip selection signal end CS, clock signal terminal SK, the first data I/O end DI, the second data I/O end DO of described storer 4 respectively;
Described main control chip 3 also is provided with the first signal output part P1.3 and is connected with described alarm 5 with secondary signal output terminal P1.4.
Described alarm 5 is provided with driver Q, relay J and loudspeaker B, the first driving signal input IN1 of this driver Q and the second driving signal input IN2 are connected the first signal output part P1.3 and the secondary signal output terminal P1.4 of described main control chip 3 respectively, and this first drive output OUT1 is connected with loudspeaker B with described relay J respectively with the second drive output OUT2.
Described anti-cheating device also is provided with interface chip F, display 6 and keyboard 7, the 3rd I/O end P0 of described main control chip 3, the 3rd signal output part P2.4, the 4th signal output part P2.3, the second chip selection signal output terminal P2.2, the 5th signal output part P2.1, external interrupt end INT0, address latch allows signal end ALE, reset terminal RST respectively with the input/output signal end DB0 of described interface chip F, the first signal input part A0, secondary signal input end A1, sheet choosing end CS, read control end RD, request bus access control end RQ, clock signal terminal CLK, reset terminal RST connects;
Described interface chip F also is provided with first and shows that output terminal DP, second shows output terminal DSL, shows that with described display 6 first input end, second shows that input end is connected respectively;
Described keyboard 7 is provided with first output terminal and second output terminal, and this first output terminal is connected with the second initialize data end KSL with the first initialize data end KRL of described interface chip F respectively with second output terminal.Its principle of work is as follows:
Before the detection, at first detect default value by keyboard 7 to main control chip 3 inputs, main control chip 3 these default value of control are stored in the storer 4.
The first test side a and the second test side b are connected on the input cable between electronic scale resistance bridge R and the electronic-weighing instrument, if two input cable spans are connected to the cheating power supply, the first cut-off switch J1 and the second cut-off switch J2 have disconnected the power supply of LOAD CELLS, under the normal condition, between the two input cables is not have power supply, if but the first test side a and the second test side b have detected electric signal, after this moment, electric signal amplified by amplifying circuit 1, be transferred to modulus conversion chip 2, modulus conversion chip 2 is after the analog signal conversion of input becomes digital signal, digital data transmission is arrived main control chip 3, main control chip 3 reads default value from storer 4, the numerical value and the default value of the digital signal of 3 pairs of inputs of main control chip compare, if the numerical value of digital signal and default value are not inconsistent, prove that so two input cable spans are connected to the cheating power supply, this moment, main control chip 3 output alarm signals driving alarm and display carried out sound and light alarm.
After the power supply that has disconnected LOAD CELLS, connect the 3rd power switch J3 and the 4th power switch J4, the 3rd power switch J3 and the 4th power switch J4 provide a reliable and stable direct supply for electronic scale resistance bridge R, whether the electronic scale anti-cheating device accurate by the current signal that the first test side a and the second test side b detect this electronic scale resistance bridge R, if this moment alarm 5 and display 6) carry out sound and light alarm.
Whether adopt this device to detect digital electronic weighing apparatus and practise fraud, principle and connected mode are identical with the analog electronic scale of detection.
Claims (7)
1. electronic scale anti-cheating device, comprise amplifying circuit (1), modulus conversion chip (2), main control chip (3), storer (4) and alarm (5), wherein amplifying circuit (1) is provided with the first test side a and the second test side b, the output terminal of this amplifying circuit (1) is connected with the input end of modulus conversion chip (2), the output terminal of this modulus conversion chip (2) is connected with the input end of main control chip (3), the I/O end of this main control chip (3) is connected with the I/O end of storer (4), the output terminal of this main control chip (3) is connected with the input end of alarm (5), it is characterized in that: also be provided with first cut-off switch (J1) and second cut-off switch (J2).
2. according to the described electronic scale anti-cheating device of claim 1, it is characterized in that: also be provided with the 3rd power switch (J3) and the 4th power switch (J4).
3. according to the described electronic scale anti-cheating device of claim 1, it is characterized in that: the signal input anode (RS+) of described amplifying circuit (1) is connected the described first test side a and the second test side b respectively with signal input negative terminal (RS-), and the amplifying signal output terminal (OUT) of this amplifying circuit (1) is connected with the signal input part of described modulus conversion chip (2).
4. according to the described electronic scale anti-cheating device of claim 1, it is characterized in that: described modulus conversion chip (2) is provided with input end of analog signal (AIN1), oppositely (CS), first digital signal output end (SDI) and second digital signal output end (SDO) are held in the sheet choosing, wherein input end of analog signal (AIN1) connects described amplifying circuit (1), and the reverse sheet choosing end (CS) of this modulus conversion chip (2), first digital signal output end (SDI) all are connected with described main control chip (3) with second digital signal output end (SDO).
5. according to the described electronic scale anti-cheating device of claim 4, it is characterized in that: described main control chip (3) is provided with the first I/O end group, and (P1.0～P1.7) (P2.0～P2.7), first signal input part (P1.0) of this main control chip (3), secondary signal input end (P1.1), the 3rd signal input part (P1.2) are connected with chip selection signal end (CS), first signal output part (SDI) and the secondary signal output terminal (SDO) of described modulus conversion chip (2) respectively with the second I/O end group;
Described main control chip (3) is provided with the first chip selection signal output terminal (P1.5), clock signal output terminal (P1.6), the first signal I/O end (P1.7), secondary signal I/O end (P2.0) and is connected with chip selection signal end (CS), clock signal terminal (SK), the first data I/O end (DI), the second data I/O end (DO) of described storer (4) respectively;
Described main control chip (3) also is provided with first signal output part (P1.3) and is connected with described alarm (5) with secondary signal output terminal (P1.4).
6. according to the described electronic scale anti-cheating device of claim 5, it is characterized in that: described alarm (5) is provided with driver (Q), relay (J) and loudspeaker (B), first driving signal input (IN1) of this driver (Q) and second driving signal input (IN2) are connected first signal output part (P1.3) and the secondary signal output terminal (P1.4) of described main control chip (3) respectively, and this first drive output (OUT1) is connected with loudspeaker (B) with described relay (J) respectively with second drive output (OUT2).
7. according to the described electronic scale anti-cheating device of claim 1, it is characterized in that: described anti-cheating device also is provided with interface chip (F), display (6) and keyboard (7), the 3rd I/O end (P0) of described main control chip (3), the 3rd signal output part (P2.4), the 4th signal output part (P2.3), the second chip selection signal output terminal (P2,2), the 5th signal output part (P2.1), external interrupt end (INT0), address latch allows signal end (ALE), reset terminal (RST) respectively with the input/output signal end (DB0) of described interface chip (F), first signal input part (A0), secondary signal input end (A1), sheet choosing end (CS), read control end (RD), request bus access control end (RQ), clock signal terminal (CLK), reset terminal (RST) connects;
Described interface chip (F) also is provided with first and shows that output terminal (DP), second shows output terminal (DSL), shows that with described display (6) first input end, second shows that input end is connected respectively;
Described keyboard (7) is provided with first output terminal and second output terminal, and this first output terminal is connected with the second initialize data end (KSL) with the first initialize data end (KRL) of described interface chip (F) respectively with second output terminal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201280042U CN201527304U (en) | 2009-07-10 | 2009-07-10 | Electronic weighing instrument anti-cheating device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009201280042U CN201527304U (en) | 2009-07-10 | 2009-07-10 | Electronic weighing instrument anti-cheating device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201527304U true CN201527304U (en) | 2010-07-14 |
Family
ID=42518589
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009201280042U Expired - Fee Related CN201527304U (en) | 2009-07-10 | 2009-07-10 | Electronic weighing instrument anti-cheating device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201527304U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112284504A (en) * | 2020-10-20 | 2021-01-29 | 上海耀华称重系统有限公司 | Anti-cheating detection method and system suitable for weighing apparatus |
-
2009
- 2009-07-10 CN CN2009201280042U patent/CN201527304U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112284504A (en) * | 2020-10-20 | 2021-01-29 | 上海耀华称重系统有限公司 | Anti-cheating detection method and system suitable for weighing apparatus |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103344913B (en) | A kind of electromagnetic relay checkout equipment and method | |
| CN101142493B (en) | Apparatus and method for measuring the amount of the current in battery cells using a plurality of sensing resistors | |
| CN201788265U (en) | Tester for battery protection board | |
| CN110261759B (en) | Chip pin damage detection system | |
| CN101750162B (en) | Method, device and terminal for detection of terminal abnormal heating | |
| CN104635102A (en) | Electronic component detection device and detection method thereof | |
| CN104777377B (en) | Lead-acid battery charger output characteristics detecting system and its detection method | |
| CN103022962A (en) | Circuit breaker and method for checking a rogowski converter in a circuit breaker | |
| CN102098368A (en) | Mobile phone | |
| CN201527304U (en) | Electronic weighing instrument anti-cheating device | |
| CN208433982U (en) | A kind of 1553B bus network test macro | |
| CN201152777Y (en) | Remote control preventing apparatus for electric measurement type electronic weighing instrument | |
| CN210603570U (en) | Be applied to and detect foil gage pressure sensor broken string circuit | |
| CN105891591B (en) | A kind of large power energy storage inverter current detecting and controlling system | |
| CN202022663U (en) | Torque limiting device with automatic sensor cable breakage detection function | |
| CN202171469U (en) | Sensor tester | |
| CN106461489B (en) | The break detection circuit of pressure-detecting device | |
| CN103308803A (en) | Adapter with self-checking circuit and system interface integrated structure | |
| CN110133402A (en) | A kind of position finding and detection method, system and the mobile terminal of circuit board screw | |
| CN217443499U (en) | Relay operating characteristic measuring device | |
| CN204422772U (en) | Be applicable to the pick-up unit whether detection electric energy meter is in place | |
| CN201130216Y (en) | Apparatus for automatically detecting voltage essential resistance | |
| CN205450201U (en) | Intelligent test circuit board | |
| US20120158345A1 (en) | Current balance testing system | |
| CN202502157U (en) | Apparatus for measuring resistance-type parameter and equipment voltage |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100714 Termination date: 20120710 |