Electronic scales

Abstract

The embodiment of the present invention discloses an electronic scale, comprising first to fourth pressure sensors R4 connected in sequence to form a full-bridge network, wherein the output end of the first pressure sensor and the output end of the third pressure sensor R3 are connected between the positive and negative poles of a power supply; a reference voltage circuit, wherein the reference voltage circuit is connected between the positive and negative poles of the power supply, and the reference voltage circuit comprises a reference voltage output end; a microcontroller chip, wherein the microcontroller chip is connected to the second output end of the second pressure sensor R2 and the fourth output end of the fourth pressure sensor R4, and the microcontroller chip is also connected to the reference voltage output end, and the microcontroller chip calculates a weighing weight W and a weighing center of gravity offset parameter ΔW according to a reference signal provided by the reference voltage output end and a signal provided by the second output end of the second pressure sensor R2 and the fourth output end of the fourth pressure sensor R4; the electronic scale of the present invention can detect the center of gravity offset of a human body.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of weighing, and in particular to an electronic scale for weighing a human body. Background Art

[0002] With the improvement of people's living standards, weight has become a health data that people are more and more concerned about in life. At present, the measurement of weight is mainly collected and measured by resistive strain gauge pressure sensors, which are mechanical pointer type and electronic digital type. Electronic body scales usually use 4 pressure sensors connected by wiring to form a full bridge, namely the "Wheatstone bridge". Two sensors are connected to the power signal excitation end, and the output end of the other two sensors outputs a changing pressure electrical signal under the influence of the pressure of the weighing object, which is used to calculate the weight of the human body. However, the body scales of the prior art cannot detect the deviation of the center of gravity of the human body.

[0003] Therefore, an electronic scale capable of detecting the displacement of the center of gravity of the human body has become a technical problem that urgently needs to be solved in the prior art. Summary of the invention

[0004] An embodiment of the present invention provides an electronic scale capable of detecting the deviation of the center of gravity of a human body.

[0005] An electronic scale, comprising:

[0006] A first pressure sensor, a second pressure sensor, a third pressure sensor and a fourth pressure sensor, wherein the first to fourth pressure sensors are connected in sequence to form a full-bridge network, and an output end of the first pressure sensor and an output end of the third pressure sensor are connected between the positive and negative electrodes of a power supply;

[0007] A reference voltage circuit, the reference voltage circuit is connected between the positive and negative electrodes of the power supply, and the reference voltage circuit includes a reference voltage output terminal;

[0008] A microcontrol chip, the microcontrol chip is connected to the second output end of the second pressure sensor and the fourth output end of the fourth pressure sensor, the microcontrol chip is also connected to the reference voltage output end, and the microcontrol chip calculates the weighing weight W and the weighing center of gravity offset parameter ΔW according to the reference signal provided by the reference voltage output end and the signals provided by the second output end of the second pressure sensor and the fourth output end of the fourth pressure sensor;

[0009] A display device is connected to the microcontroller chip and is used to display the weighing weight W and the weighing center of gravity offset parameter ΔW.

[0010] Furthermore, the display includes a first display area and a second display area, the first display area is used to display the weighing weight W, and the second display area is used to display the weighing center of gravity offset parameter ΔW.

[0011] Furthermore, the second display area is used to display three text messages of "biased to the left", "biased to the right" and "balanced" to indicate different weighing center of gravity offset parameters.

[0012] Furthermore, the second display area is used to display one of three human body images of "leaning to the left", "leaning to the right" and "balanced" to represent different weighing center of gravity offset parameters.

[0013] Furthermore, the microcontrol chip includes a first comparison amplifier, the second output end of the second pressure sensor is connected to the first input end of the first comparison amplifier, the reference voltage output end is connected to the second input end of the first comparison amplifier, and when the electronic scale is unloaded, the first comparison amplifier is used to generate a first no-load output S1_V0_ADC, and when the electronic scale is loaded, the first comparison amplifier is used to generate a first loaded output S1_V1_ADC.

[0014] Furthermore, the microcontrol chip includes a second comparison amplifier, the fourth output terminal of the fourth pressure sensor is connected to the first input terminal of the second comparison amplifier, the reference voltage output terminal is connected to the second input terminal of the second comparison amplifier, and when the electronic scale is unloaded, the second comparison amplifier is used to generate a second no-load output S0_V0_ADC, and when the electronic scale is loaded, the second comparison amplifier is used to generate a second loaded output S0_V1_ADC.

[0015] Furthermore, the microcontroller chip further comprises a memory and a computing unit, and the output end of the first comparison amplifier and the output end of the second comparison amplifier are both connected to the memory.

[0016] The memory is used to store the first no-load output S1_V0_ADC=K*(S1_V0-V ref ), the first load-bearing output S1_V1_ADC = K*(S1_V1 – V ref ), the second no-load output S0_V0_ADC = K*(S0_V0-V ref ) and the second load-bearing output S0_V1_ADC=K*(S0_V1-V ref ), where K is the magnification, S1_V0 is the sensing signal of the second output end when the electronic scale is unloaded, S1_V1 is the sensing signal of the second output end when the electronic scale is loaded, V ref A reference voltage signal provided to a reference voltage output terminal;

[0017] The calculation unit calculates the first weighing change value ΔS1 between the first load-bearing output and the first no-load output according to the data stored in the memory. The calculation unit of the microcontrol chip is also used to calculate the second weighing change value ΔS0 between the second load-bearing output and the second no-load output. The calculation unit of the microcontrol chip is also used to calculate the total change ΔS between the first weighing change value ΔS1 and the second weighing change value ΔS0. The calculation unit of the microcontrol chip calculates the weighing center of gravity offset parameter ΔW according to the weighing weight W, the first weighing change value ΔS1, the second weighing change value ΔS0 and the total change ΔS.

[0018] Further, the microcontroller chip includes a multi-channel converter, a third comparison amplifier, a memory and a calculation unit, the second output end of the second pressure sensor, the fourth output end of the fourth pressure sensor and the reference voltage output end are connected to the input end of the multi-channel converter, the output end of the multi-channel converter is connected to two input ends of the third comparison amplifier, the output end of the third comparison amplifier is connected to the memory, and the multi-channel converter can switch the connection relationship between its input end and output end between the first mode and the second mode;

[0019] In the first mode, the multi-channel converter can connect the second output end of the second pressure sensor to the first input end of the third comparison amplifier, and the reference voltage output end is connected to the second input end of the third comparison amplifier; when the electronic scale is unloaded, the third comparison amplifier is used to generate a first unloaded output S1_V0_ADC=K*(S1_V0-V ref ), when the electronic scale is loaded, the third comparison amplifier is used to generate a first load-bearing output S1_V1_ADC=K*(S1_V1–V ref ), where K is the magnification, S1_V0 is the sensing signal of the second output end when the electronic scale is unloaded, S1_V1 is the sensing signal of the second output end when the electronic scale is loaded, V ref A reference voltage signal provided to a reference voltage output terminal Vref;

[0020] In the second mode, the fourth output terminal of the fourth pressure sensor is connected to the first input terminal of the third comparison amplifier, and the reference voltage output terminal is connected to the second input terminal of the third comparison amplifier. When the electronic scale is unloaded, the third comparison amplifier is used to generate a second unloaded output S0_V0_ADC=K*(S0_V0-V ref ), when the electronic scale is loaded, the third comparison amplifier is used to generate a second load-bearing output S0_V1_ADC=K*(S0_V1-V ref ), S0_V0 is the sensing signal of the fourth output terminal when the electronic scale is unloaded, and S0_V1 is the sensing signal of the fourth output terminal when the electronic scale is loaded;

[0021] The memory is used to store the first no-load output S1_V0_ADC, the first load-bearing output S1_V1_ADC, the second no-load output S0_V0_ADC and the second load-bearing output S0_V1_ADC respectively for calculation by the calculation unit.

[0022] Furthermore, the electronic scale also includes a Bluetooth module for receiving personal information parameters provided by the user from a mobile phone, and the microcontroller chip generates the user's physical exercise information based on the personal information parameters, weighing weight W, and weighing center of gravity offset parameter ΔW, and the display device is further used to display the personal information parameters and physical exercise information.

[0023] Furthermore, the electronic scale also includes a voice prompt module for providing voice prompts for one or more of the personal information parameters, the weighing weight W, the weighing center of gravity offset parameter ΔW and the physical exercise information.

[0024] Compared with the prior art, the electronic scale provided in the embodiment of the present invention adds a reference voltage circuit, thereby accurately measuring the weighing center of gravity offset parameter ΔW when the user is standing and weighing without changing the circuit structure of the existing electronic scale. The circuit structure is simple, practical and low in cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the circuit structure of an electronic scale provided in Embodiment 1 of the present invention;

[0026] Figure 2 A schematic diagram of the circuit structure of an electronic scale provided in Embodiment 2 of the present invention;

[0027] Figure 3 A schematic diagram of the circuit structure of an electronic scale provided in Embodiment 3 of the present invention;

[0028] Figure 4 It is a schematic diagram of multiple icons showing the weighing center of gravity offset parameter ΔW of the electronic scale according to the third embodiment of the present invention;

[0029] Figure 5 A schematic diagram of the circuit structure of an electronic scale provided in Embodiment 4 of the present invention;

[0030] Figure 6 This is a schematic diagram of the circuit structure of the microcontroller chip of the electronic scale provided in Embodiment 5 of the present invention. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0032] It should be mentioned before discussing the exemplary embodiments in more detail that some exemplary embodiments are described as processes or methods depicted as flow charts. Although the flow charts describe the steps as sequential processes, many of the steps therein can be implemented in parallel, concurrently or simultaneously. In addition, the order of the steps can be rearranged. The process can be terminated when its operation is completed, but can also have additional steps not included in the accompanying drawings. The process can correspond to a method, function, procedure, subroutine, subprogram, etc.

[0033] In addition, the terms "first", "second", etc. can be used in this article to describe various directions, actions, steps or elements, but these directions, actions, steps or elements are not limited by these terms. These terms are only used to distinguish a first direction, action, step or element from another direction, action, step or element. For example, without departing from the scope of the present application, the first speed difference can be referred to as the second speed difference, and similarly, the second speed difference can be referred to as the first speed difference. Both the first speed difference and the second speed difference are speed differences, but they are not the same speed difference. The terms "first", "second", etc. cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0034] Embodiment 1

[0035] refer to Figure 1, the present embodiment provides an electronic scale, and the electronic scale of the present embodiment includes a first pressure sensor R1, a second pressure sensor R2, a third pressure sensor R3 and a fourth pressure sensor R4. In the present embodiment, the four pressure sensors R1-R4 will be fixed on a weighing plane, and the fixed point positions of the four pressure sensors R1-R4 will form a rectangle or a square. In the present embodiment, the first to fourth pressure sensors R1-R4 are connected end to end in sequence to form a full-bridge network. In the present embodiment, the pressure sensing resistors of the four pressure sensors R1-R4 are connected in series end to end in sequence to form a Wheatstone bridge. The first pressure sensor R1 includes a first output terminal E1, the second pressure sensor R2 includes a second output terminal S1, the third pressure sensor R3 includes a third output terminal E0, and the fourth pressure sensor R4 includes a fourth output terminal S0. The first output terminal E1 of the first pressure sensor R1 and the third output terminal E0 of the third pressure sensor R3 of this embodiment are connected between the positive and negative electrodes V+ and V- of the power supply B1. For example, the first output terminal E1 of the first pressure sensor R1 is connected to the positive electrode V+ of the power supply, and the third output terminal E0 of the third pressure sensor R3 is connected to the negative electrode V- of the power supply. The second output terminal S1 of the second pressure sensor R2 and the fourth output terminal S0 of the fourth pressure sensor R4 are used to generate different sensing signals according to the weight of the human body to be measured. In this embodiment, the first pressure sensor R1, the second pressure sensor R2, the third pressure sensor R3 and the fourth pressure sensor R4 all use single-arm sensors.

[0036] In this embodiment, the electronic scale further includes a reference voltage circuit, which is connected between the positive and negative electrodes V+ and V- of the power supply B1, and includes a reference voltage output terminal Vref. Specifically, the reference voltage circuit of this embodiment includes a fifth resistor R5 and a sixth resistor R6 connected in series. One end of the fifth resistor R5 is connected to the first output terminal E1, the other end of the fifth resistor R5 is connected to one end of the sixth resistor R6, and the other end of the sixth resistor R6 is connected to the third output terminal E0. The resistance values ​​of the fifth resistor R5 and the sixth resistor R6 of this embodiment are equal, and the node between the fifth resistor R5 and the sixth resistor R6 is used as a reference voltage output terminal Vref to output half the power supply voltage.

[0037] The electronic scale of this embodiment further includes a microcontroller chip M1, which is connected to the second output terminal S1 of the second pressure sensor R2 and the fourth output terminal S0 of the fourth pressure sensor R4. The microcontroller chip M1 is also connected to the reference voltage output terminal Vref. When the user measures his weight, he stands directly on the weighing plane, and the pressure will be distributed to the four sensors R1-R4. The microcontroller chip M1 of this embodiment can calculate the weighing weight W and the weighing center of gravity offset parameter ΔW according to the reference signal provided by the reference voltage output terminal Vref and the weighing signal provided by the second output terminal S1 of the second pressure sensor R2 and the fourth output terminal S0 of the fourth pressure sensor R4, as described in detail below.

[0038] The microcontroller chip M1 includes a first comparison amplifier C1, a second output terminal S1 of the second pressure sensor R2 is connected to a first input terminal of the first comparison amplifier C1, and the reference voltage output terminal Vref is connected to a second input terminal of the first comparison amplifier C1. When the electronic scale is unloaded, the first comparison amplifier C1 is used to generate a first unloaded output S1_V0_ADC=K*(S1_V0-V ref ), when the electronic scale is loaded, the first comparison amplifier C1 is used to generate a first load-bearing output S1_V1_ADC=K*(S1_V1–V ref ), where K is the magnification factor, S1_V0 is the sensing signal of the second output terminal S1 when the electronic scale is unloaded, S1_V1 is the sensing signal of the second output terminal S1 when the electronic scale is loaded, V ref A reference voltage signal provided by the reference voltage output terminal Vref.

[0039] The microcontroller chip M1 further includes a second comparison amplifier C2, the fourth output terminal S0 of the fourth pressure sensor R4 is connected to the first input terminal of the second comparison amplifier C2, and the reference voltage output terminal Vref is connected to the second input terminal of the second comparison amplifier C2. When the electronic scale is unloaded, the second comparison amplifier C2 is used to generate a second unloaded output S0_V0_ADC=K*(S0_V0-V ref ), when the electronic scale is loaded, the second comparison amplifier C2 is used to generate a second load-bearing output S0_V1_ADC=K*(S0_V1-V ref ). Wherein, K is the magnification factor, S0_V0 is the sensing signal of the fourth output terminal S0 when the electronic scale is unloaded, S0_V1 is the sensing signal of the fourth output terminal S0 when the electronic scale is loaded, V ref A reference voltage signal provided by the reference voltage output terminal Vref.

[0040] In this embodiment, the microcontroller chip M1 further includes a memory RAM and a computing unit U1. The output end of the first comparison amplifier C1 and the output end of the second comparison amplifier C2 are both connected to the memory RAM, and the memory RAM is used to store the first no-load output S1_V0_ADC=K*(S1_V0-V ref ), the first load-bearing output S1_V1_ADC = K*(S1_V1 – V ref ), the second no-load output S0_V0_ADC = K*(S0_V0-V ref ) and the second load-bearing output S0_V1_ADC=K*(S0_V1-V ref ), where K is the magnification, S1_V0 is the sensing signal of the second output end when the electronic scale is unloaded, S1_V1 is the sensing signal of the second output end when the electronic scale is loaded, V ref A reference voltage signal provided by the reference voltage output terminal Vref.

[0041] The microcontrol chip connects the second output terminal S1 of the second pressure sensor R2 to the first input terminal of the fourth comparison amplifier C4, and the fourth output terminal S0 of the fourth pressure sensor R4 is connected to the second input terminal of the fourth comparison amplifier C4. When the electronic scale is unloaded, the fourth comparison amplifier C4 is used to generate a total no-load output S1_S0_V0_ADC. When the electronic scale is loaded, the fourth comparison amplifier C4 is used to generate a total load-bearing output S1_S0_V1_ADC. The calculation unit U1 converts the total weight W = S1_S0_V1_ADC-S1_S0_V0_ADC according to the difference between S1_S0_V1_ADC and S1_S0_V0_ADC.

[0042] The calculation unit U1 of the microcontrol chip M1 calculates the first weighing change value ΔS1=S1_V1_ADC-S1_V0_ADC between the first load-bearing output S1_V1_ADC and the first no-load output S1_V0_ADC according to the data stored in the memory. The calculation unit U1 of the microcontrol chip M1 is also used to calculate the second weighing change value ΔS0=S0_V1_ADC-S0_V0_ADC between the second load-bearing output S0_V1_ADC and the second no-load output S0_V0_ADC according to the data stored in the memory.

[0043] The calculation unit U1 of the microcontroller chip M1 is also used to calculate the total change ΔS=ΔS1-ΔS0 between the first weighing change value ΔS1 and the second weighing change value ΔS0 according to the data stored in the memory. The calculation unit U1 of the microcontroller chip M1 calculates the weighing center of gravity offset parameter ΔW according to the weighing weight W, the first weighing change value ΔS1, the second weighing change value ΔS0 and the total change ΔS. The weighing center of gravity offset parameter ΔW of this embodiment is calculated as follows:

[0044] W1=(ΔS1 / ΔS)*W,

[0045] W0=(ΔS0 / ΔS)*W,

[0046] ΔW=W1-W0

[0047] Compared with the prior art, the electronic scale of this embodiment adds a reference voltage circuit to achieve accurate measurement of the weighing center of gravity offset parameter ΔW when a human body is standing and weighing without changing the circuit structure of the existing electronic scale. The circuit structure is simple, practical and low-cost.

[0048] Embodiment 2

[0049] refer to Figure 2 , This embodiment provides another electronic scale, and the electronic scale of this embodiment includes a first pressure sensor R1, a second pressure sensor R2, a third pressure sensor R3 and a fourth pressure sensor R4. In this embodiment, the four pressure sensors R1-R4 will be fixed on a weighing plane, and the fixed point positions of the four pressure sensors R1-R4 will form a rectangle or a square. In this embodiment, the first to fourth pressure sensors R1-R4 are connected in sequence to form a full-bridge network, that is, a Wheatstone bridge. , In this embodiment, the pressure sensing resistors of the four pressure sensors R1-R4 are connected in series end to end to form a full-bridge network, and the first pressure sensor R1 includes a first output terminal E1, the second pressure sensor R2 includes a second output terminal S1, the third pressure sensor R3 includes a third output terminal E0, and the fourth pressure sensor R4 includes a fourth output terminal S0. The first output terminal E1 of the first pressure sensor R1 and the third output terminal E0 of the third pressure sensor R3 of this embodiment are connected between the positive and negative electrodes of the power supply B1. For example, the first output terminal E1 of the first pressure sensor R1 is connected to the positive electrode V+ of the power supply, and the third output terminal E0 of the third pressure sensor R3 is connected to the negative electrode V- of the power supply. The second output terminal S1 of the second pressure sensor R2 and the fourth output terminal S0 of the fourth pressure sensor R4 are used to generate different sensing signals according to the weight of the human body to be measured. In this embodiment, the first pressure sensor R1, the second pressure sensor R2, the third pressure sensor R3 and the fourth pressure sensor R4 use single-arm sensors.

[0050] In this embodiment, the electronic scale further includes a reference voltage circuit, which is connected between the positive and negative electrodes of the power supply B1, and includes a reference voltage output terminal Vref. Specifically, the reference voltage circuit in this embodiment includes a fifth resistor R5 and a sixth resistor R6 connected in series, one end of the fifth resistor R5 is connected to the first output terminal E1, the other end of the fifth resistor R5 is connected to one end of the sixth resistor R6, and the other end of the sixth resistor R6 is connected to the third output terminal E0. The resistance values ​​of the fifth resistor R5 and the sixth resistor R6 in this embodiment are equal, and the node between the fifth resistor R5 and the sixth resistor R6 is used as a reference voltage output terminal Vref for outputting half of the power supply voltage.

[0051] The electronic scale of this embodiment further includes a microcontroller chip M1, which is connected to the second output terminal S1 of the second pressure sensor R2 and the fourth output terminal S0 of the fourth pressure sensor R4. The microcontroller chip M1 is also connected to the reference voltage output terminal Vref. When the user measures his weight, he stands directly on the weighing plane, and the pressure will be distributed to the four sensors. The microcontroller chip M1 of this embodiment can calculate the weighing weight W and the weighing center of gravity offset parameter ΔW according to the reference signal provided by the reference voltage output terminal Vref and the weighing signal provided by the second output terminal S1 of the second pressure sensor R2 and the fourth output terminal S0 of the fourth pressure sensor R4.

[0052] The difference from the first embodiment is that the microcontroller chip M1 of this embodiment includes a multi-channel converter T1, a third comparison amplifier C3, a memory RAM and a calculation unit U1, the second output terminal S1 of the second pressure sensor R2, the fourth output terminal S0 of the fourth pressure sensor R4 and the reference voltage output terminal Vref are connected to the input terminal of the multi-channel converter T1, the output terminal of the multi-channel converter T1 is connected to the two input terminals of the third comparison amplifier C3, and the output terminal of the third comparison amplifier C3 is connected to the memory RAM. In this embodiment, the multi-channel converter T1 can switch the connection relationship between its input terminal and output terminal between the first mode and the second mode. In an alternative embodiment, the multi-channel converter T1 can be two, respectively connected to the two input terminals of the third comparison amplifier C3, for respectively controlling different signals input to the two input terminals of the third comparison amplifier C3 in each clock cycle.

[0053] In the first mode, the multi-channel converter T1 can connect the second output terminal S1 of the second pressure sensor R2 to the first input terminal of the third comparison amplifier C3, and the reference voltage output terminal Vref is connected to the second input terminal of the third comparison amplifier C3. When the electronic scale is unloaded, the third comparison amplifier C3 is used to generate a first unloaded output S1_V0_ADC=K*(S1_V0-V ref), when the electronic scale is loaded, the third comparison amplifier C3 is used to generate a first load-bearing output S1_V1_ADC=K*(S1_V1–V ref ). Where K is the magnification factor, S1_V0 is the sensing signal of the second output terminal S1 when the electronic scale is unloaded, S1_V1 is the sensing signal of the second output terminal S1 when the electronic scale is loaded, V ref A reference voltage signal provided by the reference voltage output terminal Vref.

[0054] In the second mode, the fourth output terminal S0 of the fourth pressure sensor R4 is connected to the first input terminal of the third comparison amplifier C3, and the reference voltage output terminal Vref is connected to the second input terminal of the third comparison amplifier C3. When the electronic scale is unloaded, the third comparison amplifier C3 is used to generate a second unloaded output S0_V0_ADC=K*(S0_V0-V ref ), when the electronic scale is loaded, the third comparison amplifier C3 is used to generate a second load-bearing output S0_V1_ADC=K*(S0_V1-V ref ). Wherein, K is the magnification factor, S0_V0 is the sensing signal of the fourth output terminal S0 when the electronic scale is unloaded, S0_V1 is the sensing signal of the fourth output terminal S0 when the electronic scale is loaded, V ref A reference voltage signal provided by the reference voltage output terminal Vref.

[0055] The memory is used to store the first no-load output S1_V0_ADC=K*(S1_V0-V ref ), the first load-bearing output S1_V1_ADC = K*(S1_V1 – V ref ), the second no-load output S0_V0_ADC = K*(S0_V0-V ref ) and the second load-bearing output S0_V1_ADC=K*(S0_V1-V ref ) is used by the computing unit U1 to perform calculations.

[0056] In the third mode, the second output terminal S1 and the fourth output terminal S0 are respectively connected to the two input terminals of the third comparison amplifier C3. When the electronic scale is unloaded, the output of the third comparison amplifier C3 is the unloaded weight W0. When the electronic scale is loaded, the output of the third comparison amplifier C3 is the loaded weight W1. When the electronic scale is unloaded, the third comparison amplifier C3 is used to generate a total unloaded output S1_S0_V0_ADC. When the electronic scale is loaded, the third comparison amplifier C3 is used to generate a total loaded output S1_S0_V1_ADC. The calculation unit U1 converts the difference between S1_S0_V1_ADC and S1_S0_V0_ADC to obtain the total weight W=S1_S0_V1_ADC-S1_S0_V0_ADC.

[0057] The calculation unit U1 of the microcontroller chip M1 is further used to calculate a first weighing change value ΔS1 = S1_V1_ADC - S1_V0_ADC between the first load-bearing output S1_V1_ADC and the first no-load output S1_V0_ADC.

[0058] The calculation unit U1 of the microcontroller chip M1 is also used to calculate the second weighing change value ΔS0=S0_V1_ADC-S0_V0_ADC. The calculation unit U1 of the microcontroller chip M1 is also used to calculate the total change ΔS=ΔS1-ΔS0 between the first weighing change value ΔS1 and the second weighing change value ΔS0. The calculation unit U1 of the microcontroller chip M1 calculates the weighing center of gravity offset parameter ΔW according to the weighing weight W, the first weighing change value ΔS1, the second weighing change value ΔS0 and the total change ΔS. The weighing center of gravity offset parameter ΔW of this embodiment is calculated as follows:

[0059] W1=(ΔS1 / ΔS)*W,

[0060] W0=(ΔS0 / ΔS)*W,

[0061] ΔW=W1-W0

[0062] Compared with the prior art, the microcontroller chip M1 of the electronic scale of this embodiment uses a multi-channel converter T1 to switch the signal input to the calculation unit U1, which simplifies the circuit structure and can further reduce the cost of using the chip.

[0063] Embodiment 3

[0064] refer to Figure 3-4 The electronic scale provided in this embodiment further includes a display device D1, which is connected to the microcontroller chip M1 and is used to display the weighing weight W and the weighing center of gravity offset parameter ΔW. Specifically, the display device D1 includes a first display area 31 and a second display area 32, the first display area is used to display the weighing weight W, and the second display area is used to display the weighing center of gravity offset parameter ΔW. In a preferred embodiment, the second display area is used to display three text messages of "left biased", "right biased", and "balanced" to indicate different weighing center of gravity offset parameters. In an alternative embodiment, the second display area is used to display Figure 4 One of the three human body images of "leftward" 41, "rightward" 42, and "balanced" 43 is shown to represent different weighing center of gravity offset parameters. The image displayed by the electronic scale of this embodiment is vivid, so that the user can have a better use experience.

[0065] Embodiment 4

[0066] refer to Figure 5The electronic scale provided in this embodiment further includes a Bluetooth module BT, which is used to receive personal information parameters provided by the user from the mobile phone, such as height, weight, age, etc. The microcontroller chip M1 generates the user's physical exercise information according to the personal information parameters, the weighing weight W, and the weighing center of gravity offset parameter ΔW. The display device D1 is further used to display the personal information parameters and physical exercise information. For example, the weighing user can exercise for 10 minutes a day or the weighing user does not need to perform high-intensity exercise at present. In this embodiment, the electronic scale further includes a voice prompt module SP, which is used to give voice prompts for the personal information parameters, the weighing weight W, the weighing center of gravity offset parameter ΔW, and the physical exercise information prompts. The voice prompt module of this embodiment facilitates the weighing user to understand the weighing results from multiple channels, facilitates the use experience of different users, and has wide adaptability.

[0067] Embodiment 5

[0068] refer to Figure 6 On the basis of the second embodiment, the microcontroller chip M1 of the electronic scale provided in this embodiment includes a multi-channel converter T1, a third comparison amplifier C3, an analog-to-digital converter ADC, a filter F, a memory RAM and a calculation unit U1. The connection relationship of the input end of the multi-channel converter T1 is the same as that of the second embodiment, the output end of the multi-channel converter T1 is connected to the two input ends of the third comparison amplifier C3, the output end of the third comparison amplifier C3 is connected to the input end of the analog-to-digital converter ADC, and the output end of the analog-to-digital converter ADC is connected to the memory RAM. In this embodiment, the analog signal output from the comparison amplifier C3 is converted into a digital signal by the digital converter ADC and stored in the memory RAM after denoising and filtering, so that the calculation unit U1 can read it for calculation as needed.

[0069] It is worth noting that in the embodiment of the above-mentioned instrument information display device, the various units and modules included are only divided according to functional logic, but are not limited to the above-mentioned division, as long as the corresponding functions can be achieved; in addition, the specific names of the functional units are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of the present invention.

[0070] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. An electronic scale, characterized in that include: A first pressure sensor, a second pressure sensor, a third pressure sensor and a fourth pressure sensor, wherein the first to fourth pressure sensors are connected in sequence to form a full-bridge network, and an output end of the first pressure sensor and an output end of the third pressure sensor are connected between the positive and negative electrodes of a power supply; a reference voltage circuit, wherein the reference voltage circuit is connected between the positive and negative electrodes of the power supply, and the reference voltage circuit includes a reference voltage output end; A microcontrol chip, the microcontrol chip is connected to the second output end of the second pressure sensor and the fourth output end of the fourth pressure sensor, the microcontrol chip is also connected to the reference voltage output end, and the microcontrol chip calculates the weighing weight W and the weighing center of gravity offset parameter ΔW according to the reference signal provided by the reference voltage output end and the signals provided by the second output end of the second pressure sensor and the fourth output end of the fourth pressure sensor; A display device, the display device is connected to the microcontroller chip and is used to display the weighing weight W and the weighing center of gravity offset parameter ΔW; The microcontrol chip includes a first comparison amplifier, the second output end of the second pressure sensor is connected to the first input end of the first comparison amplifier, the reference voltage output end is connected to the second input end of the first comparison amplifier, when the electronic scale is unloaded, the first comparison amplifier is used to generate a first unloaded output S1_V0_ADC, when the electronic scale is loaded, the first comparison amplifier is used to generate a first loaded output S1_V1_ADC; The display device includes a first display area and a second display area, the first display area is used to display the weighing weight W, and the second display area is used to display the weighing center of gravity offset parameter ΔW.

2. The electronic scale according to claim 1, characterized in that: The second display area is used to display three text messages of "left biased", "right biased" and "balanced" to indicate different weighing center of gravity offset parameters.

3. The electronic scale according to claim 1, characterized in that: The second display area is used to display one of three human body images of "left-leaning", "right-leaning" and "balanced" to represent different weighing center of gravity offset parameters.

4. The electronic scale according to claim 1, characterized in that: The microcontrol chip includes a second comparison amplifier, the fourth output end of the fourth pressure sensor is connected to the first input end of the second comparison amplifier, and the reference voltage output end is connected to the second input end of the second comparison amplifier. When the electronic scale is unloaded, the second comparison amplifier is used to generate a second no-load output S0_V0_ADC, and when the electronic scale is loaded, the second comparison amplifier is used to generate a second loaded output S0_V1_ADC.

5. The electronic scale according to claim 4, characterized in that: The microcontroller chip further includes a memory and a computing unit. The output end of the first comparison amplifier and the output end of the second comparison amplifier are both connected to the memory. The memory is used to store the first no-load output S1_V0_ADC=K*(S1_V0-V ref )、The first load-bearing output S1_V1_ADC=K*(S1_V1–V ref ), the second no-load output S0_V0_ADC=K*(S0_V0-V ref ) and the second load-bearing output S0_V1_ADC=K*(S0_V1-V ref ), where K is the magnification, S1_V0 is the sensing signal of the second output end when the electronic scale is unloaded, S1_V1 is the sensing signal of the second output end when the electronic scale is loaded, V ref A reference voltage signal provided to a reference voltage output terminal; The calculation unit calculates the first weighing change value ΔS1 between the first load-bearing output and the first no-load output according to the data stored in the memory. The calculation unit of the microcontrol chip is also used to calculate the second weighing change value ΔS0 between the second load-bearing output and the second no-load output. The calculation unit of the microcontrol chip is also used to calculate the total change ΔS between the first weighing change value ΔS1 and the second weighing change value ΔS0. The calculation unit of the microcontrol chip calculates the weighing center of gravity offset parameter ΔW according to the weighing weight W, the first weighing change value ΔS1, the second weighing change value ΔS0 and the total change ΔS.

6. An electronic scale, characterized in that include: A first pressure sensor, a second pressure sensor, a third pressure sensor and a fourth pressure sensor, wherein the first to fourth pressure sensors are connected in sequence to form a full-bridge network, and an output end of the first pressure sensor and an output end of the third pressure sensor are connected between the positive and negative electrodes of a power supply; A reference voltage circuit, the reference voltage circuit is connected between the positive and negative electrodes of the power supply, and the reference voltage circuit includes a reference voltage output terminal; A microcontrol chip, the microcontrol chip is connected to the second output end of the second pressure sensor and the fourth output end of the fourth pressure sensor, the microcontrol chip is also connected to the reference voltage output end, and the microcontrol chip calculates the weighing weight W and the weighing center of gravity offset parameter ΔW according to the reference signal provided by the reference voltage output end and the signals provided by the second output end of the second pressure sensor and the fourth output end of the fourth pressure sensor; A display device, the display device is connected to the microcontroller chip and is used to display the weighing weight W and the weighing center of gravity offset parameter ΔW; The display device comprises a first display area and a second display area, the first display area is used to display the weighing weight W, and the second display area is used to display the weighing center of gravity offset parameter ΔW; The microcontrol chip includes a multi-channel converter, a third comparison amplifier, a memory and a calculation unit, the second output end of the second pressure sensor, the fourth output end of the fourth pressure sensor and the reference voltage output end are connected to the input end of the multi-channel converter, the output end of the multi-channel converter is connected to the two input ends of the third comparison amplifier, the output end of the third comparison amplifier is connected to the memory, and the multi-channel converter can switch the connection relationship between its input end and output end between the first mode and the second mode; In the first mode, the multi-channel converter can connect the second output end of the second pressure sensor to the first input end of the third comparison amplifier, and the reference voltage output end is connected to the second input end of the third comparison amplifier; when the electronic scale is unloaded, the third comparison amplifier is used to generate a first unloaded output S1_V0_ADC=K*(S1_V0-V ref ), when the electronic scale is loaded, the third comparison amplifier is used to generate a first load-bearing output S1_V1_ADC=K*(S1_V1–V ref ), where K is the magnification, S1_V0 is the sensing signal of the second output end when the electronic scale is unloaded, S1_V1 is the sensing signal of the second output end when the electronic scale is loaded, V ref A reference voltage signal provided to a reference voltage output terminal Vref; In the second mode, the fourth output terminal of the fourth pressure sensor is connected to the first input terminal of the third comparison amplifier, and the reference voltage output terminal is connected to the second input terminal of the third comparison amplifier. When the electronic scale is unloaded, the third comparison amplifier is used to generate a second unloaded output S0_V0_ADC=K*(S0_V0-V ref ), when the electronic scale is loaded, the third comparison amplifier is used to generate a second load-bearing output S0_V1_ADC=K*(S0_V1-V ref ), S0_V0 is the sensing signal of the fourth output terminal when the electronic scale is unloaded, and S0_V1 is the sensing signal of the fourth output terminal when the electronic scale is loaded; The memory is used to store the first no-load output S1_V0_ADC, the first load-bearing output S1_V1_ADC, the second no-load output S0_V0_ADC and the second load-bearing output S0_V1_ADC respectively for calculation by the calculation unit.

7. The electronic scale according to any one of claims 1-6 further comprises a Bluetooth module for receiving personal information parameters provided by the user from a mobile phone, the microcontroller chip generates the user's physical exercise information according to the personal information parameters, weighing weight W and weighing center of gravity offset parameter ΔW, and the display device is further used to display the personal information parameters and physical exercise information.

8. The electronic scale according to claim 7, characterized in that: It further includes a voice prompt module for providing voice prompts for one or more of the personal information parameters, the weighing weight W, the weighing center of gravity offset parameter ΔW and the physical exercise information.

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