CN109655140B - Electronic scales - Google Patents
Electronic scales Download PDFInfo
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- CN109655140B CN109655140B CN201910088213.7A CN201910088213A CN109655140B CN 109655140 B CN109655140 B CN 109655140B CN 201910088213 A CN201910088213 A CN 201910088213A CN 109655140 B CN109655140 B CN 109655140B
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- pressure sensor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
- G01G19/44—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for weighing persons
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M1/00—Testing static or dynamic balance of machines or structures
- G01M1/12—Static balancing; Determining position of centre of gravity
- G01M1/122—Determining position of centre of gravity
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- Engineering & Computer Science (AREA)
- Aviation & Aerospace Engineering (AREA)
- Measuring Fluid Pressure (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
The embodiment of the invention discloses an electronic scale, which comprises a first pressure sensor R4, a reference voltage circuit, a micro-control chip and a micro-control chip, wherein the first pressure sensor R4 to the fourth pressure sensor R4 are sequentially connected to form a full-bridge network, the output end of the first pressure sensor and the output end of the third pressure sensor R3 are connected between the positive electrode and the negative electrode of a power supply, the reference voltage circuit is connected between the positive electrode and the negative electrode of the power supply and comprises a reference voltage output end, the micro-control 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, the micro-control chip is also connected to the reference voltage output end, and calculates weighing weight W and weighing gravity center offset parameter DeltaW 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 a signal provided by the fourth output end of the fourth pressure sensor R4.
Description
Technical Field
The embodiment of the invention relates to the field of weighing, in particular to an electronic scale for weighing a human body.
Background
With the improvement of the living standard of people, weight has become a health data of increasing concern in life. At present, the weight is mainly measured by a resistance strain type pressure sensor, and the weight is measured by a mechanical pointer type and an electronic digital type. The electronic body balance usually adopts 4 pressure sensors to form a full bridge through wiring, namely a 'Wheatstone bridge' in which two sensors are connected with a power signal excitation end, and the output ends of the other two sensors are influenced by the pressure of a weighing object to output a changed pressure electric signal for calculating the weight of a human body. However, the related art body scales cannot detect the shift of the center of gravity of the human body.
Therefore, an electronic scale capable of detecting the gravity center deviation of a human body becomes a technical problem which needs to be solved urgently in the prior art.
Disclosure of Invention
The embodiment of the invention provides an electronic scale capable of detecting the gravity center deviation of a human body.
An electronic scale, comprising:
The system comprises a first pressure sensor, a second pressure sensor, a third pressure sensor and a fourth pressure sensor, wherein the first pressure sensor, the second pressure sensor, the third pressure sensor and the fourth pressure sensor are sequentially connected to form a full-bridge network, and the output end of the first pressure sensor and the output end of the third pressure sensor are connected between the anode and the cathode of a power supply;
The reference voltage circuit is connected between the anode and the cathode of the power supply and comprises a reference voltage output end;
The micro-control chip is connected to the second output end of the second pressure sensor and the fourth output end of the fourth pressure sensor, and is also connected to the reference voltage output end, and the micro-control chip calculates weighing weight W and weighing gravity center offset parameters delta W according to the reference signals 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;
and the display device is connected to the micro-control chip and used for displaying the weighing weight W and the weighing gravity center offset parameter delta W.
Further, the display includes a first display area for displaying the weighing weight W and a second display area for displaying a weighing center of gravity shift parameter Δw.
Further, the second display area is used for displaying three text information of left deviation, right deviation and balance so as to represent different weighing gravity center offset parameters.
Further, the second display area is used for displaying one of three human body images of left side, right side and balance to represent different weighing gravity center offset parameters.
Further, the micro-control chip comprises a first comparison amplifier, a second output end of the second pressure sensor is connected to a first input end of the first comparison amplifier, the reference voltage output end is connected to a second input end of the first comparison amplifier, when the electronic scale is empty, the first comparison amplifier is used for generating a first empty load output S1_V0_ADC, and when the electronic scale is load-bearing, the first comparison amplifier is used for generating a first load output S1_V1_ADC.
Further, the micro-control chip comprises a second comparison amplifier, a fourth output end of the fourth pressure sensor is connected to a first input end of the second comparison amplifier, the reference voltage output end is connected to a second input end of the second comparison amplifier, the second comparison amplifier is used for generating a second no-load output S0_V0_ADC when the electronic scale is in no-load state, and the second comparison amplifier is used for generating a second load output S0_V1_ADC when the electronic scale is in load state.
Further, the micro-control chip also comprises a memory and a calculating 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 configured to store a first idle load output s1_v0_adc=k (s1_v0-V ref), a first load bearing output s1_v1_adc=k (s1_v1-V ref), a second idle load output s0_v0_adc=k (s0_v0-V ref), and a second load bearing output s0_v1_adc=k (s0_v1-V ref), respectively, where K is an amplification factor, s1_v0 is a sensing signal of the second output end when the electronic scale is idle, s1_v1 is a sensing signal of the second output end when the electronic scale is load bearing, and V ref is a reference voltage signal provided by the reference voltage output end;
The calculation unit calculates a first weighing change value delta S1 between the first bearing output and the first no-load output according to data stored in the memory, the calculation unit of the micro-control chip is further used for calculating a second weighing change value delta S0 between the second bearing output and the second no-load output, the calculation unit of the micro-control chip is further used for calculating a total change value delta S between the first weighing change value delta S1 and the second weighing change value delta S0, and the calculation unit of the micro-control chip calculates and obtains the weighing gravity center offset parameter delta W according to the weighing weight W, the first weighing change value delta S1, the second weighing change value delta S0 and the total change value delta S.
Further, the micro-control chip comprises a multi-channel converter, a third comparison amplifier, a memory and a calculation unit, wherein 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 enable the connection relation between the input end and the output end of the multi-channel converter to be converted between a first mode and a second mode;
In a first mode, the multichannel converter can enable the second output end of the second pressure sensor to be connected to the first input end of the third comparison amplifier, the reference voltage output end is connected to the second input end of the third comparison amplifier, when the electronic scale is in idle load, the third comparison amplifier is used for generating a first idle load output S1_V0_ADC=K (S1_V0-V ref), when the electronic scale is in load, the third comparison amplifier is used for generating a first load output S1_V1_ADC=K (S1_V1-V ref), wherein K is an amplification factor, S1_V0 is a sensing signal of the second output end when the electronic scale is in idle load, S1_V1 is a sensing signal of the second output end when the electronic scale is in idle load, and V ref is a reference voltage signal provided by the reference voltage output end Vref;
In a second mode, the fourth output end of the fourth pressure sensor is connected to the first input end of the third comparison amplifier, the reference voltage output end is connected to the second input end of the third comparison amplifier, the third comparison amplifier is used for generating a second idle load output s0_v0_adc=k (s0_v0-V ref) when the electronic scale is idle, the third comparison amplifier is used for generating a second load output s0_v1_adc=k (s0_v1-V ref) when the electronic scale is load-bearing, s0_v0 is a sensing signal of the fourth output end when the electronic scale is idle, and s0_v1 is a sensing signal of the fourth output end when the electronic scale is load-bearing;
The memory is used for respectively storing a first empty load output S1_V0_ADC, a first bearing output S1_V1_ADC, a second empty load output S0_V0_ADC and a second bearing output S0_V1_ADC for calculation by the calculation unit.
Further, the electronic scale further comprises a bluetooth module, the bluetooth module is used for receiving personal information parameters provided by a user from a mobile phone, the micro-control chip is used for generating physical exercise information of the user according to the personal information parameters, the weighing weight W and the weighing gravity center deviation parameter DeltaW, and the display device is further used for displaying the personal information parameters and the physical exercise information.
Further, the electronic scale further comprises a voice prompt module, which is used for carrying out voice prompt on one or more of the person information parameter, the weighing weight W and the weighing gravity center deviation parameter DeltaW physical exercise information.
Compared with the prior art, the electronic scale provided by the embodiment of the invention has the advantages that the reference voltage circuit is added, the weighing gravity center offset parameter delta W when a user stands for weighing is accurately measured on the basis of not changing the circuit structure of the existing electronic scale, the circuit is simple and practical in structure, and the cost is low.
Drawings
Fig. 1 is a schematic circuit diagram of an electronic scale according to an embodiment of the invention;
fig. 2 is a schematic circuit diagram of an electronic scale according to a second embodiment of the present invention;
fig. 3 is a schematic circuit diagram of an electronic scale according to a third embodiment of the present invention;
FIG. 4 is a schematic diagram of an electronic scale according to a third embodiment of the present invention showing a plurality of icons of the weighing center of gravity shift parameter ΔW;
fig. 5 is a schematic circuit diagram of an electronic scale according to a fourth embodiment of the present invention;
fig. 6 is a schematic circuit diagram of a micro-control chip of an electronic scale according to a fifth embodiment of the present invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
Before discussing exemplary embodiments in more detail, it should be mentioned that some exemplary embodiments are described as processes or methods depicted as flowcharts. Although a flowchart depicts steps as a sequential process, many of the steps may be implemented in parallel, concurrently, or with other steps. Furthermore, the order of the steps may be rearranged. The process may be terminated when its operations are completed, but may have additional steps not included in the figures. The processes may correspond to methods, functions, procedures, subroutines, and the like.
Furthermore, the terms "first," "second," and the like, may be used herein to describe various directions, acts, steps, or elements, etc., but these directions, acts, steps, or elements are not limited by these terms. These terms are only used to distinguish one direction, action, step or element from another direction, action, step or element. For example, the first speed difference may be referred to as a second speed difference, and similarly, the second speed difference may be referred to as the first speed difference, without departing from the scope of the present application. 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," and the like, are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
Example 1
Referring to fig. 1, the present embodiment provides an electronic scale, which 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 are fixed on a weighing plane, and the fixed point positions of the four pressure sensors R1-R4 form a rectangle or square. In this embodiment, the first to fourth pressure sensors R1 to R4 are sequentially connected end to form a full bridge network. In this embodiment, the pressure sensing resistors of the four pressure sensors R1-R4 are connected in series end to end in order to form a wheatstone bridge. The first pressure sensor R1 comprises a first output E1, the second pressure sensor R2 comprises a second output S1, the third pressure sensor R3 comprises a third output E0, and the fourth pressure sensor R4 comprises a fourth output S0. The first output end E1 of the first pressure sensor R1 and the third output end E0 of the third pressure sensor R3 of the present embodiment are connected between the positive and negative poles v+, V-of the power supply B1, for example, the first output end E1 of the first pressure sensor R1 is connected to the positive pole v+ of the power supply and the third output end E0 of the third pressure sensor R3 is connected to the negative pole V-of the power supply. The second output end S1 of the second pressure sensor R2 and the fourth output end S0 of the fourth pressure sensor R4 are used for generating different sensing signals according to the weight of the human body to be detected. 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.
In this embodiment, the electronic scale further includes a reference voltage circuit, the reference voltage circuit is connected between the positive and negative poles v+ and V-of the power supply B1, and the reference voltage circuit includes a reference voltage output terminal Vref. Specifically, the reference voltage circuit of the present 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 fifth resistor R5 and the sixth resistor R6 of the present embodiment have equal resistance values, and a node between the fifth resistor R5 and the sixth resistor R6 is used as the reference voltage output terminal Vref for outputting one half of the power supply voltage.
The electronic scale of the present embodiment further includes a micro-control chip M1, where the micro-control chip M1 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 micro-control chip M1 is also connected to the reference voltage output terminal Vref. When the user measures the body weight, the direct connection station is on the weighing plane, the pressure is distributed to the four sensors R1-R4, and the micro-control chip M1 of the embodiment can calculate the weighing weight W and the weighing center shift parameter Δw according to the reference signal provided by the reference voltage output terminal Vref and the weighing signals 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, which are described in detail below.
The micro-control chip M1 includes a first comparison amplifier C1, the second output terminal S1 of the second pressure sensor R2 is connected to the first input terminal of the first comparison amplifier C1, and the reference voltage output terminal Vref is connected to the second input terminal of the first comparison amplifier C1. When the electronic scale is in idle load, the first comparison amplifier C1 is configured to generate a first idle load output s1_v0_adc=k (s1_v0-V ref), and when the electronic scale is in load, the first comparison amplifier C1 is configured to generate a first load output s1_v1_adc=k (s1_v1-V ref), where K is an amplification factor, s1_v0 is a sensing signal of the second output terminal S1 when the electronic scale is in idle load, s1_v1 is a sensing signal of the second output terminal S1 when the electronic scale is in load, and V ref is a reference voltage signal provided by the reference voltage output terminal Vref.
The micro-control chip M1 further includes a second comparing amplifier C2, the fourth output terminal S0 of the fourth pressure sensor R4 is connected to the first input terminal of the second comparing amplifier C2, and the reference voltage output terminal Vref is connected to the second input terminal of the second comparing amplifier C2. When the electronic scale is empty, the second comparison amplifier C2 is configured to generate a second empty output s0_v0_adc=k (s0_v0-V ref), and when the electronic scale is load-bearing, the second comparison amplifier C2 is configured to generate a second load-bearing output s0_v1_adc=k (s0_v1-V ref). Wherein K is the amplification factor, S0_V0 is the sensing signal of the fourth output end S0 when the electronic scale is in no load, S0_V1 is the sensing signal of the fourth output end S0 when the electronic scale is in load bearing, and V ref is the reference voltage signal provided by the reference voltage output end Vref.
In this embodiment, the micro-control chip M1 further includes a memory RAM and a computing unit U1, where the output end of the first comparing amplifier C1 and the output end of the second comparing amplifier C2 are both connected to the memory RAM, and the memory RAM is configured to store a first idle load output s1_v0_adc=k (s1_v0-V ref), a first load bearing output s1_v1_adc=k (s1_v1-V ref), a second idle load output s0_v0_adc=k (s0_v0-V ref), and a second load bearing output s0_v1_adc=k (s0_v1-V ref), where K is an amplification factor, s1_v0 is a sensing signal of the second output end when the electronic scale is idle, s1_v1 is a sensing signal of the second output end when the electronic scale is idle, and V ref is a reference voltage signal provided by the reference voltage output Vref.
The micro-control chip connects the second output end S1 of the second pressure sensor R2 to the first input end of a fourth comparison amplifier C4, the fourth output end S0 of the fourth pressure sensor R4 is connected to the second input end of the fourth comparison amplifier C4, the fourth comparison amplifier C4 is used for generating a total empty load output S1_S0_V0_ADC when the electronic scale is empty, the fourth comparison amplifier C4 is used for generating a total bearing output S1_S0_V1_ADC when the electronic scale is bearing, and the calculating unit U1 is used for calculating the total bearing weight W=S1_S0_V1_ADC-S1_S0_S0_V0_ADC according to the difference between the S1_S0_V1_ADC and the S1_S0_V0_ADC.
The calculating unit U1 of the micro-control chip M1 calculates a first weighing variation value Δs1=s1_v1_adc-s1_v0_adc between the first load bearing output s1_v1_adc and the first idle output s1_v0_adc according to the data stored in the memory, and the calculating unit U1 of the micro-control chip M1 is further configured to calculate a second weighing variation value Δs0=s0_v1_adc-s0_v0_adc between the second load bearing output s0_v1_adc and the second idle output s0_v0_adc according to the data stored in the memory.
The calculating unit U1 of the micro-control chip M1 is further configured to calculate a total variation Δs=Δs1- Δs0 between the first weighing variation Δs1 and the second weighing variation Δs0 according to the data stored in the memory, where the calculating unit U1 of the micro-control chip M1 calculates the weighing center of gravity offset parameter Δw according to the weighing weight W, the first weighing variation Δs1, the second weighing variation Δs0, and the total variation Δs. The weighing center of gravity shift parameter Δw of the present embodiment is calculated as follows:
W1=(ΔS1/ΔS)*W,
W0=(ΔS0/ΔS)*W,
ΔW=W1-W0
Compared with the prior art, the electronic scale of the embodiment has the advantages that the reference voltage circuit is added, the weighing gravity center offset parameter delta W when a human body stands for weighing is accurately measured on the basis of not changing the circuit structure of the existing electronic scale, and the circuit is simple and practical in structure and low in cost.
Example two
Referring to fig. 2, the present embodiment provides another electronic scale, which 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 are fixed on a weighing plane, and the fixed points of the four pressure sensors R1-R4 form a rectangle or square, and in this embodiment, the first to fourth pressure sensors R1-R4 are sequentially connected to form a full bridge network, i.e. a wheatstone bridge. In this embodiment, the pressure sensing resistors of the four pressure sensors R1-R4 are serially connected end to end in order to form a full bridge network, the first pressure sensor R1 includes a first output end E1, the second pressure sensor R2 includes a second output end S1, the third pressure sensor R3 includes a third output end E0, and the fourth pressure sensor R4 includes a fourth output end S0. The first output end E1 of the first pressure sensor R1 and the third output end E0 of the third pressure sensor R3 of the present embodiment are connected between the positive and negative poles of the power supply B1, for example, the first output end E1 of the first pressure sensor R1 is connected to the positive pole v+ of the power supply and the third output end E0 of the third pressure sensor R3 is connected to the negative pole V-of the power supply. The second output end S1 of the second pressure sensor R2 and the fourth output end S0 of the fourth pressure sensor R4 are used for generating different sensing signals according to the weight of the human body to be detected. In this embodiment, the first pressure sensor R1, the second pressure sensor R2, the third pressure sensor R3, and the fourth pressure sensor R4 are single-arm sensors.
In this embodiment, the electronic scale further includes a reference voltage circuit, where the reference voltage circuit is connected between the positive and negative poles of the power supply B1, and the reference voltage circuit includes a reference voltage output terminal Vref. Specifically, the reference voltage circuit of the present 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 fifth resistor R5 and the sixth resistor R6 of the present embodiment have equal resistance values, and a node between the fifth resistor R5 and the sixth resistor R6 is used as the reference voltage output terminal Vref for outputting one half of the power supply voltage.
The electronic scale of the present embodiment further includes a micro-control chip M1, where the micro-control chip M1 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 micro-control chip M1 is also connected to the reference voltage output terminal Vref. When the user measures the body weight, the direct connection station is on the weighing plane, the pressure is distributed to the four sensors, and the micro-control chip M1 of the embodiment can calculate the weighing weight W and the weighing gravity center offset parameter Δw according to the reference signal provided by the reference voltage output end Vref and the weighing signals provided by the second output end S1 of the second pressure sensor R2 and the fourth output end S0 of the fourth pressure sensor R4.
The difference from the first embodiment is that the micro control chip M1 of the present embodiment includes a multi-channel converter T1, a third comparison amplifier C3, a memory RAM and a calculation unit U1, where 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 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 may switch the connection relationship between its input and output terminals between the first mode and the second mode. In an alternative embodiment, the number of the multi-channel converters T1 may be two, and the two input terminals of the third comparing amplifier C3 are respectively connected to control different signals input by the two input terminals of the third comparing amplifier C3 every clock cycle.
In the first mode, the multi-channel converter T1 may cause the second output terminal S1 of the second pressure sensor R2 to be connected to the first input terminal of the third comparison amplifier C3, and the reference voltage output terminal Vref to be connected to the second input terminal of the third comparison amplifier C3. The third comparison amplifier C3 is configured to generate a first no-load output s1_v0_adc=k (s1_v0-V ref) when the electronic scale is empty, and the third comparison amplifier C3 is configured to generate a first load output s1_v1_adc=k (s1_v1-V ref) when the electronic scale is load-bearing. Wherein K is the amplification factor, S1_V0 is the sensing signal of the second output end S1 when the electronic scale is in no load, S1_V1 is the sensing signal of the second output end S1 when the electronic scale is in load bearing, and V ref is the reference voltage signal provided by the reference voltage output end Vref.
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 empty, the third comparison amplifier C3 is configured to generate a second empty output s0_v0_adc=k (s0_v0-V ref), and when the electronic scale is load-bearing, the third comparison amplifier C3 is configured to generate a second load-bearing output s0_v1_adc=k (s0_v1-V ref). Wherein K is the amplification factor, S0_V0 is the sensing signal of the fourth output end S0 when the electronic scale is in no load, S0_V1 is the sensing signal of the fourth output end S0 when the electronic scale is in load bearing, and V ref is the reference voltage signal provided by the reference voltage output end Vref.
The memory is used for respectively storing a first idle load output s1_v0_adc=k (s1_v0-V ref), a first load bearing output s1_v1_adc=k (s1_v1-V ref), a second idle load output s0_v0_adc=k (s0_v0-V ref) and a second load bearing output s0_v1_adc=k (s0_v1-V ref) for calculation by the calculation unit U1.
In the third mode, the second output end S1 and the fourth output end S0 are respectively connected to two input ends of the third comparison amplifier C3, when the electronic scale is empty, the output of the third comparison amplifier C3 is empty weighing W0, and when the electronic scale is load-bearing, the output of the third comparison amplifier C3 is load weighing W1. When the electronic scale is in idle load, the third comparison amplifier C3 is used for generating a total idle load output S1_S0_V0_ADC, when the electronic scale is in load, the third comparison amplifier C3 is used for generating a total load output S1_S0_V1_ADC, and the calculation unit U1 is used for calculating the total load W=S1_S0_V1_ADC-S1_S0_V0_V0_ADC according to the difference between the S1_S0_V1_ADC and the S1_S0_V0_ADC.
The calculating unit U1 of the micro-control chip M1 is further configured to calculate a first weighing variation value Δs1=s1_v1_adc-s1_v0_adc between the first load-bearing output s1_v1_adc and the first idle output s1_v0_adc.
The calculating unit U1 of the micro-control chip M1 is further configured to calculate a second weighing variation value Δs0=s0_v1_adc-s0_v0_adc. The calculating unit U1 of the micro-control chip M1 is further configured to calculate a total variation Δs=Δs1- Δs0 between the first weighing variation Δs1 and the second weighing variation Δs0, and the calculating unit U1 of the micro-control chip M1 calculates the weighing center of gravity offset parameter Δw according to the weighing weight W, the first weighing variation Δs1, the second weighing variation Δs0, and the total variation Δs. The weighing center of gravity shift parameter Δw of the present embodiment is calculated as follows:
W1=(ΔS1/ΔS)*W,
W0=(ΔS0/ΔS)*W,
ΔW=W1-W0
compared with the prior art, the micro-control chip M1 multichannel converter T1 of the electronic scale switches signals input into the computing unit U1, so that the circuit structure is simplified, and the body cost of the chip can be further reduced.
Example III
Referring to fig. 3 to 4, the electronic scale provided in this embodiment further includes a display device D1, where the display device D1 is connected to the micro-control chip M1 for displaying the weighing weight W and the weighing center of gravity shift parameter Δw. Specifically, the display device D1 includes a first display area 31 for displaying the weighing weight W and a second display area 32 for displaying a weighing center of gravity shift parameter Δw. In a preferred embodiment, the second display area is used for displaying three text information of "left-shift", "right-shift" and "balance" to represent different weighing center of gravity shift parameters. In an alternative embodiment, the second display area is used to display one of three human body images, i.e. a "left" 41, a "right" 42, and a "balance" 43, as shown in fig. 4, so as to represent different weighing center of gravity shifting parameters. The displayed image of the electronic scale is vivid, so that a user can have better use experience.
Example IV
Referring to fig. 5, the electronic scale provided in this embodiment further includes a bluetooth module BT for receiving personal information parameters, such as height, weight, age, etc., provided by the user from the mobile phone, and the micro-control chip M1 generates physical exercise information of the user according to the personal information parameters, the weighing weight W, and the weighing center offset parameter Δw. The display device D1 is further used for displaying personal information parameters and physical exercise information, for example, the weighing user can exercise for 10 minutes per day or the weighing user does not need to exercise with great intensity at present. In this embodiment, the electronic scale further includes a voice prompt module SP configured to perform voice prompt on the person information parameter, the weighing weight W, the weighing center of gravity offset parameter Δw, and the physical exercise information prompt. The voice prompt module of this embodiment has made things convenient for weighing user to know the result of weighing from the multichannel, has made things convenient for different users' use experience, and adaptability is wide.
Example five
Referring to fig. 6, on the basis of the second embodiment, the micro-control chip M1 of the electronic scale provided in the present 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 computing unit U1. The connection relation of the input ends of the multi-channel converter T1 is the same as that of the embodiment, the output end of the multi-channel converter T1 is connected to 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. The analog signal output from the comparison amplifier C3 in the present embodiment is converted into a digital signal by the digital converter ADC and is stored in the memory RAM after noise removal filtering, so that the calculation unit U1 reads out for calculation as needed.
It should be noted that, in the embodiment of the instrument information display device, the units and modules included are only divided according to the functional logic, but not limited to the above-mentioned division, so long as the corresponding functions can be implemented, and the specific names of the functional units are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present invention.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (8)
1. An electronic scale, comprising:
The system comprises a first pressure sensor, a second pressure sensor, a third pressure sensor and a fourth pressure sensor, wherein the first pressure sensor, the second pressure sensor, the third pressure sensor and the fourth pressure sensor are sequentially connected to form a full-bridge network, and the output end of the first pressure sensor and the output end of the third pressure sensor are connected between the positive electrode and the negative electrode of a power supply;
The micro-control chip is connected to the second output end of the second pressure sensor and the fourth output end of the fourth pressure sensor, and is also connected to the reference voltage output end, and the micro-control chip calculates weighing weight W and weighing gravity center offset parameters delta W according to the reference signals 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;
the display device is connected to the micro-control chip and used for displaying the weighing weight W and the weighing gravity center offset parameter delta W;
The micro-control chip comprises a first comparison amplifier, a second output end of the second pressure sensor is connected to a first input end of the first comparison amplifier, the reference voltage output end is connected to a second input end of the first comparison amplifier, the first comparison amplifier is used for generating a first no-load output S1_V0_ADC when the electronic scale is in no-load state, and the first comparison amplifier is used for generating a first load output S1_V1_ADC when the electronic scale is in load state;
The display device comprises a first display area and a second display area, wherein the first display area is used for displaying the weighing weight W, and the second display area is used for displaying a weighing gravity center offset parameter delta W.
2. The electronic scale of claim 1, wherein the second display area is configured to display three text messages, "left-hand", "right-hand" and "balance" to indicate different weight center of gravity offset parameters.
3. The electronic scale of claim 1, wherein the second display area is configured to display one of three human images, "left-hand", "right-hand", "balance" to represent different weight center of gravity offset parameters.
4. The electronic scale of claim 1, wherein the micro-control chip comprises a second comparison amplifier, wherein the fourth output of the fourth pressure sensor is connected to the first input of the second comparison amplifier, wherein the reference voltage output is connected to the second input of the second comparison amplifier, wherein the second comparison amplifier is configured to generate a second no-load output s0_v0_adc when the electronic scale is empty, and wherein the second comparison amplifier is configured to generate a second load output s0_v1_adc when the electronic scale is loaded.
5. The electronic scale of claim 4, wherein the micro-control chip further comprises a memory and a computing unit, the output of the first comparison amplifier and the output of the second comparison amplifier are both connected to the memory,
The memory is configured to store a first idle load output s1_v0_adc=k (s1_v0-V ref), a first load bearing output s1_v1_adc=k (s1_v1-V ref), a second idle load output s0_v0_adc=k (s0_v0-V ref), and a second load bearing output s0_v1_adc=k (s0_v1-V ref), respectively, where K is an amplification factor, s1_v0 is a sensing signal of the second output end when the electronic scale is idle, s1_v1 is a sensing signal of the second output end when the electronic scale is load bearing, and V ref is a reference voltage signal provided by the reference voltage output end;
The calculation unit calculates a first weighing change value delta S1 between the first bearing output and the first no-load output according to data stored in the memory, the calculation unit of the micro-control chip is further used for calculating a second weighing change value delta S0 between the second bearing output and the second no-load output, the calculation unit of the micro-control chip is further used for calculating a total change value delta S between the first weighing change value delta S1 and the second weighing change value delta S0, and the calculation unit of the micro-control chip calculates and obtains the weighing gravity center offset parameter delta W according to the weighing weight W, the first weighing change value delta S1, the second weighing change value delta S0 and the total change value delta S.
6. An electronic scale, comprising:
The system comprises a first pressure sensor, a second pressure sensor, a third pressure sensor and a fourth pressure sensor, wherein the first pressure sensor, the second pressure sensor, the third pressure sensor and the fourth pressure sensor are sequentially connected to form a full-bridge network, and the output end of the first pressure sensor and the output end of the third pressure sensor are connected between the anode and the cathode of a power supply;
The reference voltage circuit is connected between the anode and the cathode of the power supply and comprises a reference voltage output end;
The micro-control chip is connected to the second output end of the second pressure sensor and the fourth output end of the fourth pressure sensor, and is also connected to the reference voltage output end, and the micro-control chip calculates weighing weight W and weighing gravity center offset parameters delta W according to the reference signals 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;
the display device is connected to the micro-control chip and used for displaying the weighing weight W and the weighing gravity center offset parameter delta W;
The display device comprises a first display area and a second display area, wherein the first display area is used for displaying the weighing weight W, and the second display area is used for displaying a weighing gravity center offset parameter delta W;
the micro-control chip comprises a multi-channel converter, a third comparison amplifier, a memory and a computing unit, wherein a second output end of the second pressure sensor, a fourth output end of the fourth pressure sensor and a reference voltage output end are connected to an input end of the multi-channel converter, an output end of the multi-channel converter is connected to two input ends of the third comparison amplifier, an output end of the third comparison amplifier is connected to the memory, and the multi-channel converter can enable the connection relation between the input end and the output end of the multi-channel converter to be converted between a first mode and a second mode;
In a first mode, the multichannel converter can enable the second output end of the second pressure sensor to be connected to the first input end of the third comparison amplifier, the reference voltage output end is connected to the second input end of the third comparison amplifier, when the electronic scale is in idle load, the third comparison amplifier is used for generating a first idle load output S1_V0_ADC=K (S1_V0-V ref), when the electronic scale is in load, the third comparison amplifier is used for generating a first load output S1_V1_ADC=K (S1_V1-V ref), wherein K is an amplification factor, S1_V0 is a sensing signal of the second output end when the electronic scale is in idle load, S1_V1 is a sensing signal of the second output end when the electronic scale is in idle load, and V ref is a reference voltage signal provided by the reference voltage output end Vref;
In a second mode, the fourth output end of the fourth pressure sensor is connected to the first input end of the third comparison amplifier, the reference voltage output end is connected to the second input end of the third comparison amplifier, the third comparison amplifier is used for generating a second idle load output s0_v0_adc=k (s0_v0-V ref) when the electronic scale is idle, the third comparison amplifier is used for generating a second load output s0_v1_adc=k (s0_v1-V ref) when the electronic scale is load-bearing, s0_v0 is a sensing signal of the fourth output end when the electronic scale is idle, and s0_v1 is a sensing signal of the fourth output end when the electronic scale is load-bearing;
The memory is used for respectively storing a first empty load output S1_V0_ADC, a first bearing output S1_V1_ADC, a second empty load output S0_V0_ADC and a second bearing output S0_V1_ADC for calculation by the calculation unit.
7. The electronic scale according to any one of claims 1-6, further comprising a bluetooth module for receiving personal information parameters provided by a user from a mobile phone, wherein the micro-control chip generates physical exercise information of the user according to the personal information parameters, the weighing weight W, and the weighing center of gravity offset parameter aw, and wherein the display device is further configured to display the personal information parameters and the physical exercise information.
8. The electronic scale of claim 7, further comprising a voice prompt module for voice prompting one or more of the person information parameter, the weight W, the weight center of gravity offset parameter aw physical exercise information.
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| CN111998921B (en) * | 2020-09-01 | 2024-09-17 | 芯海科技（深圳）股份有限公司 | Measuring circuit, measuring method and measuring equipment |
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| US5369226A (en) * | 1993-04-29 | 1994-11-29 | Mettler-Toledo, Inc. | Load shift compensation for weighing apparatus |
| WO2004059264A1 (en) * | 2002-11-14 | 2004-07-15 | Measurement Specialties, Inc. | Weighing scale adapted for allowing a user to find an optimal weighing position on the scale |
| JP2004275280A (en) * | 2003-03-13 | 2004-10-07 | Tanita Corp | Center of gravity position measurement device |
| JP2006313096A (en) * | 2005-05-06 | 2006-11-16 | Tanita Corp | Digital weighing scale |
| CN201397188Y (en) * | 2009-02-26 | 2010-02-03 | 杭州五强电子有限公司 | Anti-cheat electronic price computing scale |
| CN102472678B (en) * | 2009-07-24 | 2014-04-23 | 罗姆股份有限公司 | Semiconductor pressure sensor, pressure sensor device, electronic device, and manufacturing method of semiconductor pressure sensor |
| FR2993654B1 (en) * | 2012-07-19 | 2014-08-08 | Withings | WEIGHING DEVICE AND METHOD |
| KR101663933B1 (en) * | 2016-05-30 | 2016-10-14 | 동의대학교 산학협력단 | Luggage weight measuring system |
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