CN204154375U - Based on the electronic scale of electromagnetic induction - Google Patents

Based on the electronic scale of electromagnetic induction Download PDF

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Publication number
CN204154375U
CN204154375U CN201420678603.2U CN201420678603U CN204154375U CN 204154375 U CN204154375 U CN 204154375U CN 201420678603 U CN201420678603 U CN 201420678603U CN 204154375 U CN204154375 U CN 204154375U
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China
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circuit
coil
electronic scale
signal
electromagnetic induction
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Expired - Fee Related
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CN201420678603.2U
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韩逸冰
王赫楠
李彤
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韩逸冰
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Abstract

Based on the electronic scale of electromagnetic induction, belong to electronic scale field.In order to solve the high and problem that is that affect by temperature and humidity of existing electronic scale many employings piezoelectric sensor cost.It comprises base, ergograph, telemetry circuit, display, connecting link, iron core, telefault and spring; Ergograph is connected with iron core top by connecting link, and iron core bottom is connected with spring one end, and the spring other end is fixedly connected with base; Telefault comprises primary coil, the first secondary coil, second subprime coil and coil rack; First secondary coil, primary coil and second subprime coil are wrapped on coil rack successively, and coil rack is enclosed within core exterior surface; The differential series connection of two secondary coils together, primary coil connects the pumping signal that telemetry circuit exports, secondary coil output voltage signal after series connection inputs to telemetry circuit, and telemetry circuit obtains body weight according to voltage signal, and telemetry circuit controls the body weight that display display obtains.It is for weighing in.

Description

Based on the electronic scale of electromagnetic induction
Technical field
The utility model belongs to electronic scale field.
Background technology
Body weight, as the most basic health index of human body, is one of important test event of physique test.What require along with health of people improves constantly, and older generation's pointer-type body weight test instrumentation starts to step down from the stage of history gradually.Towards teenagers healthy growth test analysis, towards the daily Avoirdupois monitoring of the women that likes to be beautiful, health check-up towards middle and primary schools, college student is tested, daily health check-up etc. body weight test towards large hospital needs, portable, fast and to carry out designing and developing of the digital body weight testing tool of data storage extremely urgent, the technical research of this respect is also one of main development direction in this field present stage and following a period of time simultaneously.
Existing electronic scale many employings piezoelectric sensor realizes, but the DC response that piezoelectric sensor exports is poor, needs to adopt high input impedance circuit or charge amplifier to overcome this defect, increases cost, and also needs protection against the tide, the problem of easy temperature influence.
Utility model content
The purpose of this utility model is that the utility model provides a kind of electronic scale based on electromagnetic induction in order to solve existing electronic scale many employings piezoelectric sensor cost high and problem that is that affect by temperature and humidity.
Electronic scale based on electromagnetic induction of the present utility model,
Described electronic scale comprises base, ergograph, telemetry circuit and display; Described electronic scale also comprises connecting link, iron core, telefault and spring; Ergograph is connected with the top of iron core by connecting link, and the bottom of iron core is connected with one end of spring, and the other end of spring is fixedly connected with base;
Telefault comprises primary coil, the first secondary coil, second subprime coil and coil rack; First secondary coil, primary coil and second subprime coil are wrapped on coil rack successively, and coil rack is enclosed within the outside surface of iron core; First secondary coil and the differential installation of second subprime coil are also cascaded, primary coil connects the pumping signal that telemetry circuit exports, the first secondary coil after series connection and second subprime coil output voltage signal input to telemetry circuit, telemetry circuit obtains body weight according to voltage signal, and telemetry circuit controls the body weight that display display obtains.
Described ergograph is double-legged type ergograph.
Described electronic scale also comprises scale body support frame, and described scale body support frame comprises roof platform and four scale pillar bodies; Ergograph is embedded in roof platform, and display is arranged on the upper surface of roof platform, and four angles of roof platform lower surface are fixedly connected with base respectively by four scale pillar bodies, and described scale pillar body is screwed in the first connector by the second connector and is connected to form.Described electronic scale also comprises sleeve; Jacket casing is at the outside surface of telefault.
Described telemetry circuit is arranged on base, and described telemetry circuit comprises excitation signal circuit for generating, differential amplifier circuit, phase-sensitive detection circuit, low-pass filter circuit, A/D change-over circuit and single-chip computer control system; It is primary coil input signal that single-chip computer control system controls excitation signal circuit for generating, the voltage signal that secondary coil exports inputs to differential amplifier circuit, the amplifying signal that differential amplifier circuit exports inputs to phase-sensitive detection circuit, the rectified signal that phase-sensitive detection circuit exports inputs to low-pass filter circuit, the filtering signal that low-pass filter circuit exports inputs to A/D change-over circuit, the digital signal that A/D change-over circuit exports inputs to single-chip computer control system, single-chip computer control system converts the digital signal of reception to body weight signal, controls display display.
Described telemetry circuit comprises power circuit and power switch; Power circuit provides working power for described electronic scale, and power switch controls power circuit and powers.Described electronic scale also comprises power light; Control power light display power supply circuit by single-chip computer control system and whether have electricity.
The beneficial effects of the utility model are, the utility model provides a kind of differential transformer type electronic scale based on electromagnetic induction.Its method of testing is stable, precision is high, cost is low, numerical monitor, portable, affect by temperature and humidity little.
Accompanying drawing explanation
Fig. 1 is the structural representation of the electronic scale based on electromagnetic induction described in the utility model.
Fig. 2 is the vertical view of Fig. 1.
Fig. 3 is the principle schematic of the electronic scale based on electromagnetic induction described in the utility model.
Embodiment
Embodiment one: composition graphs 1 to Fig. 3 illustrates present embodiment, the electronic scale based on electromagnetic induction described in present embodiment, described electronic scale comprises base 1, ergograph 3, telemetry circuit 10 and display 11; Described electronic scale also comprises connecting link 14, iron core 4, telefault and spring 5;
Ergograph 3 is connected with the top of iron core 4 by connecting link 14, and the bottom of iron core 4 is connected with one end of spring 5, and the other end of spring 5 is fixedly connected with base 1;
Telefault comprises primary coil 6, first secondary coil 7, second subprime coil 8 and coil rack 27; First secondary coil 7, primary coil 6 and second subprime coil 8 are wrapped on coil rack 27 successively, and coil rack 27 is enclosed within the outside surface of iron core 4; First secondary coil 7 and the differential installation of second subprime coil 8 are also cascaded, primary coil 6 connects the pumping signal that telemetry circuit exports, the first secondary coil 7 after series connection and second subprime coil 8 output voltage signal input to telemetry circuit 10, telemetry circuit 10 obtains body weight according to voltage signal, and telemetry circuit 10 controls display 11 and shows the body weight obtained.
Primary coil 6 in present embodiment and two secondary coils are wound on coil rack 27 respectively, the differential installation of two secondary coils is also serially connected, draw 3 wires, two ends tap connects pumping signal, the centre tap connecting two coils makes check point, and all coils tap imports telemetry circuit 10 by lead-in wire cover 16.There is a rod core 4 moving up and down at coil rack 27 boring place.Iron core 4 is connected with ergograph 3 by connecting link 14.Move when position occurs iron core 4 in differential winding, tapped signal can corresponding change, reflection body weight change.
As shown in Figure 3, two secondary coils of open magnetic circuit connect into difference structure, and the effective value of differential transformer output voltage is
V o = ω ( M 1 - M 2 ) R 1 2 + ( ωL ) 2 V i - - - ( 1 )
In formula, M 1, M 2be respectively primary coil L 1with secondary coil L 21, L 22mutual inductance; R 1for the resistance of primary coil; V ifor the driving voltage of primary coil 6; V ofor the driving voltage of primary coil 6.
The driving voltage V of primary coil 6 ithe sine wave that the pumping signal exported by telemetry circuit 10 provides, under its excitatory effect, coil generation mutual inductance effect.Mutual inductance value is relevant with magnetic field interior change, and the position of iron core in open-flux path is depended in the change in magnetic field, and tested body weight is depended in iron core position.Therefore, within the specific limits, as long as scale loading, then iron core moves, output voltage V ojust produce corresponding change, complete body weight information acquisition thus.Scale is removed and is carried, and iron core 4, connecting link 14 and ergograph 3 reset under the restoring force effect of stage clip 5.When scale is unloaded, when iron core is positioned at the geometric center position of differential transformer, the parameter of two secondary coils is equal with magnetic circuit size, therefore, and M 1=M 2, according to formula (1), now output voltage V obe zero.
Measured presses scale pan positioning indicating station on the ergograph 3 of bearing plate, and body weight is applied on iron core 4 by connecting link 14 and causes iron core to move down.Under AC excitation signal function, iron core 4 change in location excites electromagnetic induction, and the mutual inductance between primary coil 6 and two secondary coils 7,8 will change.The change of the difference of the voltage responded between two secondary coils of the anti-phase series connection of Same Name of Ends, process in telemetry circuit 10, result both directly can show on digital indicator 11.
Embodiment two: composition graphs 2 illustrates present embodiment, present embodiment is the further restriction to the electronic scale based on electromagnetic induction described in embodiment one, and described ergograph 3 is double-legged type ergograph.
The double-legged position of described double-legged type ergograph is accurate measuring position for measured provides, and increases the accuracy of measuring.
Embodiment three: composition graphs 1 illustrates present embodiment, present embodiment is the further restriction to the electronic scale based on electromagnetic induction described in embodiment two, described electronic scale also comprises scale body support frame, and described scale body support frame comprises roof platform 2 and four scale pillar bodies; Ergograph 3 is embedded in roof platform 2, and display 11 is arranged on the upper surface of roof platform 2, and four angles of roof platform 2 lower surface are fixedly connected with base respectively by four scale pillar bodies, and described scale pillar body is screwed in the first connector 12 by the second connector 13 and is connected to form.
Embodiment four: composition graphs 1 illustrates present embodiment, present embodiment is the further restriction to the electronic scale based on electromagnetic induction described in embodiment two, and described electronic scale also comprises sleeve 9; Sleeve 9 is enclosed within the outside surface of telefault.
Embodiment five: composition graphs 3 illustrates present embodiment, present embodiment is the further restriction to the electronic scale based on electromagnetic induction described in embodiment two, described telemetry circuit 25 is arranged on base 1, and described telemetry circuit 25 comprises excitation signal circuit for generating 20, differential amplifier circuit 21, phase-sensitive detection circuit 22, low-pass filter circuit 23, A/D change-over circuit 24 and single-chip computer control system 25, single-chip computer control system 25 controls excitation signal circuit for generating 20 for primary coil 6 input signal, the voltage signal that secondary coil exports inputs to differential amplifier circuit 21, the amplifying signal that differential amplifier circuit 21 exports inputs to phase-sensitive detection circuit 22, the rectified signal that phase-sensitive detection circuit 22 exports inputs to low-pass filter circuit 23, the filtering signal that low-pass filter circuit 23 exports inputs to A/D change-over circuit 24, the digital signal that A/D change-over circuit 24 exports inputs to single-chip computer control system 25, single-chip computer control system 25 converts the digital signal of reception to body weight signal, control display 11 to show.
The body weight information interchange voltage signal gathered is conveyed into telemetry circuit 10 through drawing cover 16.The both-end of secondary coil exports and is converted to Single-end output, so that subsequent conditioning circuit processes further by differential amplifier circuit 21.Signal sends into phase-sensitive detection circuit 22 and low-pass filter circuit 23 after differential amplifier circuit 21 differential amplify, according to principles of modulation and demodulation, the first secondary coil 7 and second subprime coil 8 output voltage signal are in fact that iron core 4 position is moved and carried out to field voltage signal the amplitude-modulated signal that amplitude modulation obtains by electromagnetic method.So phase-sensitive detection circuit 22 and low-pass filter circuit 23 mainly complete the process of all-wave phase demodulation and low-pass filtering treatment.The phase discrimination function of phase-sensitive detection circuit 22 enough completes the identification of iron core direction of motion.Phase sensitive detection adds low-pass filtering and has extremely strong noise inhibiting ability, can fundamentally improve apparatus measures non-linear.Analog DC voltage signal after low-pass filtering converts to after digital signal through A/D change-over circuit 24 and is conveyed into single-chip computer control system 25, result after analyzing and processing both directly can show on digital indicator, was also conveyed into host computer by communication interface circuit 15 and carried out administrative analysis.
Embodiment six: composition graphs 1 and Fig. 3 illustrate present embodiment, present embodiment is the further restriction to the electronic scale based on electromagnetic induction described in embodiment one, and described telemetry circuit comprises power circuit 17 and power switch 18; Power circuit 17 provides working power for described electronic scale, and power switch 18 controls power circuit 17 and powers.On power circuit 17 arranges and is present, the installation site of power switch 18 should be in above the fold, as: the upper surface of roof platform or the side of electronic scale.
Embodiment seven: composition graphs 1 and Fig. 3 illustrate present embodiment, present embodiment is the further restriction to the electronic scale based on electromagnetic induction described in embodiment one, and described electronic scale also comprises power light 19; Control power light 19 display power supply circuit 17 by single-chip computer control system 25 and whether have electricity.
The installation site of power light 19 should be in above the fold, as: the upper surface of roof platform or the side of electronic scale.

Claims (7)

1., based on an electronic scale for electromagnetic induction, described electronic scale comprises base (1), ergograph (3), telemetry circuit (10) and display (11); It is characterized in that, described electronic scale also comprises connecting link (14), iron core (4), telefault and spring (5);
Ergograph (3) is connected by the top of connecting link (14) with iron core (4), the bottom of iron core (4) is connected with one end of spring (5), and the other end of spring (5) is fixedly connected with base (1);
Telefault comprises primary coil (6), the first secondary coil (7), second subprime coil (8) and coil rack (27); First secondary coil (7), primary coil (6) and second subprime coil (8) are wrapped on coil rack (27) successively, and coil rack (27) is enclosed within the outside surface of iron core (4); First secondary coil (7) and second subprime coil (8) differential installation are also cascaded, primary coil (6) connects the pumping signal that telemetry circuit exports, the first secondary coil (7) after series connection and second subprime coil (8) output voltage signal input to telemetry circuit (10), telemetry circuit (10) obtains body weight according to voltage signal, and telemetry circuit (10) controls the body weight that display (11) display obtains.
2. the electronic scale based on electromagnetic induction according to claim 1, is characterized in that, described ergograph (3) is double-legged type ergograph.
3. the electronic scale based on electromagnetic induction according to claim 2, is characterized in that, described electronic scale also comprises scale body support frame, and described scale body support frame comprises roof platform (2) and four scale pillar bodies; Ergograph (3) is embedded in roof platform (2), display (11) is arranged on the upper surface of roof platform (2), four angles of roof platform (2) lower surface are fixedly connected with base respectively by four scale pillar bodies, and described scale pillar body is screwed in the first connector (12) by the second connector 13 and is connected to form.
4. the electronic scale based on electromagnetic induction according to claim 2, is characterized in that, described electronic scale also comprises sleeve (9); Sleeve (9) is enclosed within the outside surface of telefault.
5. the electronic scale based on electromagnetic induction according to claim 2, is characterized in that, described telemetry circuit is arranged on base (1),
Described telemetry circuit comprises excitation signal circuit for generating (20), differential amplifier circuit (21), phase-sensitive detection circuit (22), low-pass filter circuit (23), A/D change-over circuit (24) and single-chip computer control system (25);
It is primary coil (6) input signal that single-chip computer control system (25) controls excitation signal circuit for generating (20), the voltage signal that secondary coil exports inputs to differential amplifier circuit (21), the amplifying signal that differential amplifier circuit (21) exports inputs to phase-sensitive detection circuit (22), the rectified signal that phase-sensitive detection circuit (22) exports inputs to low-pass filter circuit (23), the filtering signal that low-pass filter circuit (23) exports inputs to A/D change-over circuit (24), the digital signal that A/D change-over circuit (24) exports inputs to single-chip computer control system (25), single-chip computer control system (25) converts the digital signal of reception to body weight signal, control display (11) display.
6. the electronic scale based on electromagnetic induction according to claim 5, is characterized in that, described telemetry circuit comprises power circuit (17) and power switch (18); Power circuit (17) provides working power for described electronic scale, and power switch (18) controls power circuit (17) power supply.
7. the electronic scale based on electromagnetic induction according to claim 6, is characterized in that, described electronic scale also comprises power light (19); Control power light (19) display power supply circuit (17) by single-chip computer control system (25) and whether have electricity.
CN201420678603.2U 2014-11-13 2014-11-13 Based on the electronic scale of electromagnetic induction Expired - Fee Related CN204154375U (en)

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Application Number Priority Date Filing Date Title
CN201420678603.2U CN204154375U (en) 2014-11-13 2014-11-13 Based on the electronic scale of electromagnetic induction

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Application Number Priority Date Filing Date Title
CN201420678603.2U CN204154375U (en) 2014-11-13 2014-11-13 Based on the electronic scale of electromagnetic induction

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107305142A (en) * 2016-04-22 2017-10-31 深圳富泰宏精密工业有限公司 Weighing system, hand-held device and hand-held device component
CN109516036A (en) * 2019-01-08 2019-03-26 重庆千宏科技有限公司 Intelligent environmental sanitation management system

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107305142A (en) * 2016-04-22 2017-10-31 深圳富泰宏精密工业有限公司 Weighing system, hand-held device and hand-held device component
CN109516036A (en) * 2019-01-08 2019-03-26 重庆千宏科技有限公司 Intelligent environmental sanitation management system

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CF01 Termination of patent right due to non-payment of annual fee
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Granted publication date: 20150211

Termination date: 20201113