CN210375385U

CN210375385U - Electronic scale circuit and electronic scale

Info

Publication number: CN210375385U
Application number: CN201921433326.8U
Authority: CN
Inventors: 黄乐
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-08-30
Filing date: 2019-08-30
Publication date: 2020-04-21
Anticipated expiration: 2029-08-30

Abstract

The utility model discloses an electronic scale circuit and electronic scale, this electronic scale circuit includes pressure sensor, first resistance and second resistance are established ties, pressure sensor's first end and first ohmic connection, pressure sensor's second end and second ohmic connection, wherein, pressure sensor still includes two first resistors of establishing ties and second resistor, the junction department when first resistor and second resistor is equipped with first measuring terminal, when first resistor and second resistance junction department are equipped with the second measuring terminal, the junction department of first resistor and first resistor is equipped with first power end, the junction department of second resistor and second resistor is equipped with the second power end. By means of the method, the electronic scale circuit structure is simplified, errors generated in the measuring process can be effectively reduced, the number of elements and wires can be reduced, and manufacturing cost and measuring power consumption are effectively reduced.

Description

Electronic scale circuit and electronic scale

Technical Field

The utility model relates to an electrical equipment technical field, in particular to electronic scale circuit and electronic scale.

Background

With the continuous improvement of the living standard of people, people begin to pay more and more attention to diet, in order to make nutrient and delicious food, multiple food raw materials are often needed to be matched, and at the moment, a kitchen scale is often needed to weigh various food raw materials so as to ensure the nutritive value and the taste of the cooked food.

The utility model discloses a researcher research discovery, some electronic scale circuits relate to a plurality of pressure sensor, for example a plurality of full-bridge sensors etc. pass through line connection with pressure sensor to with corresponding processing unit, the parts such as wire rod and the sensor that above-mentioned mode used are more, increase manufacturing cost easily to the line is too complicated to cause easily that the measurement appears the mistake, and the more sensor of on the other hand and wire rod also increase the energy consumption of later stage use easily.

SUMMERY OF THE UTILITY MODEL

The utility model provides an electronic scale circuit and electronic scale to solve the above-mentioned technical problem such as mistake appears with high costs and measurement that exists easily.

In order to solve the above technical problem, the utility model discloses a technical scheme provides an electronic scale circuit, including pressure sensor, first resistance and second resistance are established ties, and pressure sensor's first end and first resistance are connected, and pressure sensor's second end and second resistance are connected, and wherein, pressure sensor still includes two first resistors and second resistors of establishing ties, and when the junction of first resistor and second resistor was equipped with first measuring terminal, first resistor and the second resistance junction was equipped with the second measuring terminal, the junction of first resistor and the first resistor was equipped with the first power end, the junction of second resistor and the second resistor was equipped with the second power end; when a first power supply end is arranged at the junction of the first resistor and the second resistor and a second power supply end is arranged at the junction of the first resistor and the second resistor, a first measuring end is arranged at the junction of the first resistor and the first resistor, and a second measuring end is arranged at the junction of the second resistor and the second resistor.

For solving the technical problem, the utility model discloses a another technical scheme is: provided is an electronic scale including: casing and as above the utility model provides an electronic scale circuit.

The utility model has the advantages that: the pressure sensor comprises a first resistor, a second resistor, a first power supply end and a second power supply end, wherein the first end of the pressure sensor is connected with the first resistor, the second end of the pressure sensor is connected with the second resistor, the pressure sensor further comprises two first resistors and two second resistors which are connected in series, the first power supply end and the second power supply end are used for supplying power, and the first measuring end and the second measuring end are used for measuring detected current or voltage. By means of the method, the electronic scale circuit structure is simplified, errors generated in the measuring process can be effectively reduced, the number of elements and wires can be reduced, and manufacturing cost and measuring power consumption are effectively reduced.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive work, wherein:

FIG. 1 is a schematic diagram of an embodiment of an electronic scale circuit according to the present invention;

FIG. 2 is a schematic diagram of another embodiment of the electronic scale circuit of the present invention;

FIG. 3 is a schematic diagram of the electronic scale according to another embodiment of the present invention;

FIG. 4 is a schematic diagram of a circuit of an electronic scale according to another embodiment of the present invention;

fig. 5 is a schematic structural diagram of an embodiment of the electronic scale of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only one sub-embodiments of the present invention, rather than all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.

It should be noted that if the embodiments of the present invention are described with reference to "first", "second", etc., the description of "first", "second", etc. is only for descriptive purposes and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

Referring to fig. 1, an embodiment of the present invention provides an electronic scale circuit 100, where the electronic scale circuit 100 includes a pressure sensor 10, a first resistor R1, and a second resistor R2.

With continued reference to fig. 1, the first resistor R1 and the second resistor R2 are connected in series, and the resistances of the first resistor R1 and the second resistor R2 may be equal. The first end of the pressure sensor 10 is connected to the first resistor R1, and the second end of the pressure sensor 10 is connected to the second resistor R2, it being understood that the pressure sensor 10, the first resistor R1 and the second resistor R2 are connected in sequence to form a loop circuit. Wherein the pressure sensor 10 further comprises two series-connected first and

second resistors

11, 12. The first resistor 11 and the second resistor 12 may be the same, the first resistor 11 and the second resistor 12 may be a strain gauge, a pressure sensitive resistor, or the like, and the first resistor 11 and the second resistor 12 are used for detecting the pressure applied, and it is understood that the resistance values of the first resistor 11 and the second resistor 12 may be changed according to the pressure value applied.

The junction of the first resistor 11 and the second resistor 12 is provided with a first measuring terminal S +, and the junction of the first resistor R1 and the second resistor R2 is provided with a second measuring terminal S-. The first measuring terminal S + and the second measuring terminal S-are used for connecting with other circuits (such as a control circuit and the like). A first power source terminal S01 is provided at the junction of the first resistor R1 and the first resistor 11, and a second power source terminal S02 is provided at the junction of the second resistor R2 and the second resistor 12. The first power terminal S01 and the second power terminal S02 are used to connect to a power circuit to supply power to the pressure sensor 10.

It can be understood that the power source can be introduced into the circuit through the first power source terminal S01 and the second power source terminal S02, the first resistor R1 and the second resistor R2 perform a good voltage dividing function, the first resistor 11 and the second resistor 12 form a single half-bridge sensor, when the first resistor 11 and the second resistor 12 are subjected to pressure changes, the resistance values of the two resistors will change correspondingly, so as to cause corresponding current or voltage changes, that is, the current or voltage measured from the first measuring terminal S + and the second measuring terminal S-will change, and further, corresponding weighing data can be obtained through subsequent processing of a control circuit and the like.

Can make the electronic scale circuit structure retrench more through above-mentioned mode, for the electronic scale circuit of current full-bridge sensor electronic scale circuit or a plurality of sensor, the quantity of piezo-resistor or foil gage has effectively been reduced, and then can reduce the use of component and wire rod, thereby effectively reduced the cost of manufacture and measured power consumption, and owing to only set up single half-bridge sensor, so can effectively reduce the dish that a plurality of sensor sensitivity inconsistent brought poor, and then can promote measuring accuracy, can effectively reduce the error that produces in the measurement process.

In some embodiments, referring to fig. 1 and 2, electronic scale circuit 100 may also include temperature compensation element U2. The temperature compensation element U2 is connected to the first measurement terminal S +, the second measurement terminal S-. It can be understood that in some application scenarios, temperature is liable to affect the measurement result, when the ambient temperature increases, the resistance value of the temperature compensation element U2 increases, so that the voltage of the pressure sensor 10 may decrease, so that the first measurement terminal S +, the second measurement terminal S-output voltage may decrease, meanwhile, when the temperature increases, the elastic modulus of the pressure sensor 10 decreases, the deformation of the first resistor 11 and the second resistor 12 in the pressure sensor 10 increases, so that the resistance value increases, so that the first measurement terminal S +, the second measurement terminal S-output voltage increases, and the influence of the extreme temperature on the measurement result may be reduced by introducing the temperature compensation element.

Alternatively, with continued reference to FIG. 2, the temperature compensation element U2 may include two sets of compensation plates R connected in parallel_{Supplement device}And a temperature compensation adjusting resistor R_{Regulating device}. Compensation sheet R_{Supplement device}The resistance value of (A) may be sufficiently large and larger than the temperature compensation adjustment resistor R_{Regulating device}Temperature compensation adjusting resistor R_{Regulating device}May be a precision resistor.

In a modified embodiment, the temperature compensation element U2 is not directly connected to the first measurement terminal S +, the second measurement terminal S-, but directly connected to the first power supply terminal S01 and the second power supply terminal S02, so as to adjust the circuit temperature well and avoid burning out the element due to excessive temperature.

In some embodiments, electronic scale circuit 100 may also include power circuit U3, control circuit U4, keyboard input circuit U5, and display circuit U6. The power circuit U3, the keyboard input circuit U5 and the display circuit U6 are respectively connected with the control circuit U4. The power supply circuit U3 is used to supply power to the pressure sensor 10, the first resistor R1 and the second resistor R2, the control circuit U4, the display circuit U6, and the like. The keyboard input circuit U5 is used for controlling the control circuit U4 to realize switching or resetting and the like. The first measuring terminal S + and the second measuring terminal S-are respectively connected with the control circuit U4. The control circuit U4 is used for receiving the data transmitted by the first measuring terminal S + and the second measuring terminal S-and processing and analyzing the data. The display circuit U6 is used to display the data processed by the control circuit U4, such as specific weighing mass, etc., and of course, the display circuit may also display other information, such as electric quantity, etc.

Referring to fig. 3, the positions of the first measuring terminal S +, the second measuring terminal S-, the first power terminal and the second power terminal of the pressure sensor (or called retransmission sensor unit) of the present invention are adjusted as follows:

a first power supply terminal VS is arranged at the junction of the first resistor and the second resistor, a second power supply terminal (here, ground) is arranged at the junction of the first resistor R2 and the second resistor R3, a first measurement terminal S is arranged at the junction of the first resistor R2 and the first resistor, and a second measurement terminal S + is arranged at the junction of the second resistor R3 and the second resistor. Of course, the positions of the first measuring terminal S-and the second measuring terminal S + can also be exchanged, and the first resistor and the second resistor form a half-bridge sensor (pressure sensor) 10.

The utility model discloses an above-mentioned mode further makes the electronic scale circuit structure retrench more, for the electronic scale circuit of current full-bridge sensor electronic scale circuit or a plurality of sensor, the quantity of piezo-resistor or foil gage has effectively been reduced, and then can reduce the use of component and wire rod, thereby effectively reduced the cost of manufacture and measured the consumption, and owing to only set up single half-bridge sensor, so can effectively reduce the dish that a plurality of sensor sensitivity inconsistent brought poor, and then can promote the measuring accuracy, can effectively reduce the error that produces in the measurement process.

Alternatively, referring to fig. 4, the power circuit U3 may include the power supply 20 and a first capacitor C1. Pin 1 of the power supply 20 is connected to ground, and pin 2 of the power supply 20 is connected to the first capacitor C1 to ground. The power source 20 may be a battery or the like. The output voltage of the power supply 20 may be 5V or the like. The first capacitor C1 has functions of filtering, passing ac and blocking dc, and is connected to the first capacitor C1 through the power supply 20, so that the voltage output by the power supply circuit U3 is a dc voltage, and the output voltage is more stable.

In some embodiments, referring to fig. 4 in combination, the control circuit U4 may include a microcontroller 30, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, and a fifth capacitor C5. The microcontroller 30 may be an mcu (micro Controller unit), such as a single chip microcomputer or STM 32.

Pins

1, 3 and 6 of the microcontroller 30 are respectively and correspondingly connected to the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 to the ground. Pin 7 of the microcontroller 30 connects the fifth capacitor C5 to pin 8 of the microcontroller 30. Specific values of the second capacitor C2, the third capacitor C3, the fourth capacitor C4 and the fifth capacitor C5 may be set as required, and are not limited herein. It can be appreciated that the second capacitor C2, the third capacitor C3, the fourth capacitor C4 and the fifth capacitor C5 can perform a filtering function, so that a more stable dc power can be provided.

Pin 7 of the microcontroller 30 is connected to the first measurement terminal S +, and pin 8 of the microcontroller 30 is connected to the second measurement terminal S-. The signals of the first measuring terminal S + and the second measuring terminal S "can be introduced into the microcontroller 30 via pins 7 and 8 of the microcontroller 30. Pin 2 of the power supply 20 is connected to pin 1 and pin 5 of the microcontroller 30, respectively, pin 6 of the microcontroller 30 is also connected to the first power supply 20 terminal S01, the first power supply terminal S01 is the positive electrode of the power supply, and the second power supply terminal S02 is grounded. It will be appreciated that the power circuit U3 provides power to the control circuit U4, and then to the pressure sensor 10, the first resistor R1 and the second resistor R2 via the control circuit U4, and then the signals measured by the first measurement terminal S + and the second measurement terminal S-are returned to the microcontroller 30 for processing.

Optionally, with continued reference to fig. 4, the input circuit U5 may further include a button 40, and the pin 16 of the microcontroller 30 connects the button 40 to ground. The number of keys 40 may be one or more. The key 40 can be used to switch or reset the electronic scale circuit 100.

Of course, in other embodiments, a voltage dividing resistor (not shown) may be disposed between the microcontroller 30 and the key 40, and the voltage dividing resistor is connected in series with the key 40.

In some embodiments, referring to fig. 4, the display circuit U6 may include the display screen 50, a third resistor R3, and a light emitting diode D1. The Display 50 may be an LCD (Liquid Crystal Display) or the like. Pins 1-18 of the display screen 50 are correspondingly connected with pins 36-19 of the microcontroller 30, respectively, and pin 18 of the microcontroller 30 is connected with the third resistor R3 and the light emitting diode D1 to the ground terminal. The led D1 may provide backlighting to the display 50 or provide a notification, such as an excessive value, illuminated or flashing by the led D1. The pressure value obtained by the pressure sensor 10 can be displayed in the above manner.

In some embodiments, microcontroller 30 has a differential measurement circuit built in. The microcontroller 30 may also have an analog-to-digital conversion unit or the like built therein. It can be understood that when the pressure sensor 10 detects pressure or gravity, the first resistor R1 and the second resistor R2 are matched to obtain a measured value from the first measuring terminal S + and the second measuring terminal S-, and then send the signal to the differential measuring circuit, the analog-to-digital conversion unit, and the like of the microcontroller 30, and further send the signal to the display circuit U6, so that digital display of specific weight or pressure is realized through the display circuit U6. It can be understood that the use of wires can be effectively reduced by using the microcontroller 30 with built-in differential or analog-to-digital conversion, thereby facilitating the miniaturization design of the electronic scale circuit 100.

Referring to fig. 5, the present invention further provides an electronic scale 200, wherein the electronic scale 200 may include a housing 210 and an electronic scale circuit 100 as described in the above embodiments, and the electronic scale circuit 100 is disposed in the housing 210. For details of the electronic scale circuit 100, reference may be made to the description of the above embodiments, and details are not repeated herein.

The above only is the embodiment of the present invention, not limiting the patent scope of the present invention, all the equivalent structures or equivalent processes that are used in the specification and the attached drawings or directly or indirectly applied to other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An electronic scale circuit is characterized by comprising a pressure sensor, a first resistor and a second resistor, wherein the first resistor and the second resistor are connected in series, a first end of the pressure sensor is connected with the first resistor, a second end of the pressure sensor is connected with the second resistor, the pressure sensor further comprises two first resistors and two second resistors which are connected in series, when a first measuring end is arranged at the junction of the first resistor and the second resistor, and a second measuring end is arranged at the junction of the first resistor and the second resistor, a first power supply end is arranged at the junction of the first resistor and the first resistor, and a second power supply end is arranged at the junction of the second resistor and the second resistor; when a first power supply end is arranged at the junction of the first resistor and the second resistor and a second power supply end is arranged at the junction of the first resistor and the second resistor, a first measuring end is arranged at the junction of the first resistor and the first resistor, and a second measuring end is arranged at the junction of the second resistor and the second resistor.

2. The electronic scale circuit of claim 1, further comprising a temperature compensation element coupled to the first measurement terminal and the second measurement terminal.

3. The electronic scale circuit according to claim 1, wherein the electronic scale circuit further comprises a power supply circuit, a control circuit, a keyboard input circuit, and a display circuit, the power supply circuit, the keyboard input circuit, and the display circuit are respectively connected to the control circuit, and the first measurement terminal and the second measurement terminal are respectively connected to the control circuit.

4. The electronic scale circuit of claim 3, wherein the power circuit comprises a power source and a first capacitor, wherein a 1-pin of the power source is connected to ground, and a 2-pin of the power source is connected to the first capacitor to ground.

5. The electronic scale circuit according to claim 3, wherein the control circuit comprises a microcontroller, a second capacitor, a third capacitor, a fourth capacitor and a fifth capacitor, wherein pins 1, 3 and 6 of the microcontroller are respectively and correspondingly connected with the second capacitor, the third capacitor and the fourth capacitor to a ground terminal, pin 7 of the microcontroller is connected with the fifth capacitor to pin 8 of the microcontroller, pin 7 of the microcontroller is connected with the first measuring terminal, pin 8 of the microcontroller is connected with the second measuring terminal, pin 2 of the power supply is respectively connected with pins 1 and 5 of the microcontroller, pin 6 of the microcontroller is further connected with the first power supply terminal, the first power supply terminal is a positive power supply terminal, and the second power supply terminal is a ground terminal.

6. The electronic scale circuit of claim 5, wherein the keyboard input circuit comprises a key and a third resistor, and the 16-pin of the microcontroller connects the key and the third resistor to ground.

7. The electronic scale circuit according to claim 5, wherein the display circuit comprises a display screen, a fourth resistor and a light emitting diode, pins 1-18 of the display screen are correspondingly connected with pins 36-19 of the microcontroller, respectively, and pin 18 of the microcontroller is connected with the fourth resistor and the light emitting diode to ground.

8. The electronic scale circuit according to claim 5, wherein the microcontroller has a differential measurement circuit built in.

9. The electronic scale circuit of claim 2, wherein the temperature compensation element comprises two sets of compensation plates and a temperature compensation adjustment resistor R connected in parallel_{Regulating device}。

10. An electronic scale, characterized by comprising a housing and an electronic scale circuit according to any one of claims 1-9.