CN101093229A - Acceleration sensor in liquid type - Google Patents
Acceleration sensor in liquid type Download PDFInfo
- Publication number
- CN101093229A CN101093229A CN 200710016081 CN200710016081A CN101093229A CN 101093229 A CN101093229 A CN 101093229A CN 200710016081 CN200710016081 CN 200710016081 CN 200710016081 A CN200710016081 A CN 200710016081A CN 101093229 A CN101093229 A CN 101093229A
- Authority
- CN
- China
- Prior art keywords
- signal
- pipe ring
- output
- sensing capacitance
- glass pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 230000001133 acceleration Effects 0.000 title claims abstract description 23
- 239000007788 liquid Substances 0.000 title claims abstract description 16
- 239000011521 glass Substances 0.000 claims abstract description 19
- 238000012545 processing Methods 0.000 claims abstract description 14
- 229910000497 Amalgam Inorganic materials 0.000 claims abstract description 6
- 230000003139 buffering effect Effects 0.000 claims description 11
- 238000013461 design Methods 0.000 claims description 6
- 230000000694 effects Effects 0.000 claims description 6
- 239000004033 plastic Substances 0.000 claims description 5
- 229920003023 plastic Polymers 0.000 claims description 5
- 229910052716 thallium Inorganic materials 0.000 claims description 5
- BKVIYDNLLOSFOA-UHFFFAOYSA-N thallium Chemical compound [Tl] BKVIYDNLLOSFOA-UHFFFAOYSA-N 0.000 claims description 5
- 238000001914 filtration Methods 0.000 claims description 4
- 230000009467 reduction Effects 0.000 claims description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 230000010355 oscillation Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 9
- 230000008859 change Effects 0.000 description 8
- 239000005030 aluminium foil Substances 0.000 description 4
- 230000002093 peripheral effect Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000003860 storage Methods 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 238000005538 encapsulation Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 229910052710 silicon Inorganic materials 0.000 description 2
- 239000010703 silicon Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- -1 absorption Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000009931 harmful effect Effects 0.000 description 1
- 230000003137 locomotive effect Effects 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000003534 oscillatory effect Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 230000002277 temperature effect Effects 0.000 description 1
Images
Landscapes
- Air Bags (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
An acceleration transducer of liquid type is prepared for setting cross section of glass cup to be rectangular form, setting thallium-amalgam in partial tube ring of glass cup, fixing a sensing capacity electrode board separately and correspondingly on a haft end-surface at two side end-surfaces on glass cup then connecting said sensing capacity electrode board to signal processing circuit with signal oscillation component.
Description
Technical field
The present invention relates to a kind of locomotive sensor, relate in particular to a kind of acceleration sensor in liquid type.
Background technology
From material perpetual motion viewpoint, acceleration is a basic physical amount, and acceleration is carried out once and quadratic integral, can draw speed and displacement; The acceleration transducer of automobile, be mainly used in air bag, in order to suppress " secondary collision ", acceleration transducer is of a great variety, cost performance is different, typical products has the ADXL series of U.S. ADI company and the MMA series of products of motorola inc on the market, and they all belong to miniature silicon semiconductor capacitance acceleration transducer.Miniature silicon semiconductor capacitance acceleration transducer, the principle of work of this sensor is the capacitor type variable pitch type, the anti-damage of the excess of stroke is limited in one's ability, when range need change, need to change structure and functional module, also spring must be arranged, crash bar also needs, output result's processing also needs to prune, and machining and encapsulation all require harsh.
Summary of the invention
It is simple to the purpose of this invention is to provide a kind of manufacturing, acceleration sensor in liquid type easy to use.
For achieving the above object, the technical solution used in the present invention is:
A kind of acceleration sensor in liquid type comprises the glass pipe ring, it is characterized in that: a part is equipped with the thallium amalgam in the pipe ring of glass pipe ring; On half end face on the axial both sides end face of glass pipe ring respectively correspondence be fixed with a sensing capacitance pole plate, draw sensing capacitance lead-in wire on the sensing capacitance pole plate respectively, the sensing capacitance lead-in wire is connected with signal processing circuit; Signal processing circuit comprises: signal oscillating part, this signal have two-way output, and one the tunnel cushions through 1IC2, drives inverter, inversion output auxiliary signal u; Another road by the 1IC3 buffering, drives frequency divider, with frequency halving; Again through 1IC4 buffering output switching pulse signal A; Anti-phase through inverting amplifier 1IC5 again at the 1IC4 output terminal, output switching pulse signal B; Sensing capacitance 2C1 and reference capacitance 2C2 carry out dividing potential drop to auxiliary signal u, under the effect of switching pulse signal A and B, order is passed through alternating-current switch, and because the frequency division cause is the one-period switch, again through buffering, order enters electric capacity, electric capacity is connected on the electron discharge switch, and during absence of discharge, latch mode is unaffected; During discharge, lead the pressure reduction at two peaks to be derived mutually, obtain through 5IC1 and 5IC2, and through subsequently the two poles of the earth homophase separately amplify with setting value relatively, as surpassing setting value, then trigger monostable circuit output high level; Positive supply partly adopts a low-dropout regulator to receive on the accumulator; Negative supply has been adopted circuit output negative voltages such as vibration, inversion, rectification, filtering, voltage stabilizing.
According to described acceleration sensor in liquid type, it is characterized in that: the xsect of glass pipe ring is a rectangle.
According to described acceleration sensor in liquid type, the design of glass pipe ring outside has rubber sleeve, and the design of rubber sleeve outside has plastic wrapper.
The present invention compares the advantageous effect that has with the ADXL series acceleration transducer of U.S. ADI company and sees the following form:
The present invention is simple for structure, and signal processing circuit is simple, approaches the anti-damage ability of the infinitely-great excess of stroke.By the contrast of last table, can draw the present invention and make simply, easy to use.
Owing to adopt the processing packaged type of regular grade, volume, weight are all big than ADXL series.The surface tension of evaporation of liquid, absorption, liquid level, the temperature effect of liquid all can have influence on measuring accuracy slightly.Can come minimizing harmful effect by the measures such as doping vario-property that change its frequency of operation and hydraulic fluid as far as possible.Moreover say that for the automobile that enough installing spaces are arranged, volume is big slightly, be not any problem.
Description of drawings
Fig. 1 is a structural representation of the present invention;
Fig. 2 is the A-A cut-open view of Fig. 1;
Fig. 3 is the B-B cut-open view of Fig. 1;
Fig. 4 is the structural representation after the present invention encapsulation.
Fig. 5 is a circuit block diagram of the present invention;
Fig. 6 is one of part element circuit schematic diagram;
Fig. 7 is two of a part element circuit schematic diagram;
Fig. 8 is three of a part element circuit schematic diagram;
Fig. 9 is four of a part element circuit schematic diagram;
Figure 10 is five of a part element circuit schematic diagram;
Figure 11 is the way circuit schematic diagram.
Embodiment
Further specify embodiments of the present invention below in conjunction with embodiment:
A kind of liquid acceleration sensor comprises device part and signal processing circuit part.
The device part comprises glass pipe ring 1 as shown in Figure 1, 2, 3, and the xsect of glass pipe ring 1 is a rectangle.A part is equipped with thallium amalgam 2 in the pipe ring of glass pipe ring 1; On half end face on the axial both sides end face of glass pipe ring 1 respectively correspondence be fixed with a sensing capacitance pole plate 3, sensing capacitance pole plate 3 can be aluminium foil.Draw sensing capacitance lead-in wire 4 on the sensing capacitance pole plate 3 respectively, sensing capacitance lead-in wire 4 is connected with signal processing circuit, and sensing capacitance is 2C1 in signal processing circuit.
During use, as shown in Figure 4, sensing capacitance glass tube ring outer surface can design rubber sleeve, and the design of rubber sleeve outside surface has plastic wrapper, plays the packaging protection effect.
The signal processing circuit part comprises: 1IC1, resistance 1R1,1R2 shown in Fig. 5～11,1R3,1R4,1R5, electric capacity 1C1,1C2,1C3 forms the signal oscillating part, and this signal has two-way output, one the tunnel cushions through 1IC2, drives by resistance 1R6,1R7,1R8,1R9, triode 1VT1,1VT2, the inverter that transformer 1T1 forms, inversion output auxiliary signal u; Another road by the 1IC3 buffering, drives by resistance 1R10,1R11, and 1R12,1R13,1R14,1R15, electric capacity 1C4,1C5,1C6,1C7,1C8,1C9, diode 1VD1,1VD2, triode 1VT3, the frequency divider that 1VT4 formed is with frequency halving; Again through 1IC4 buffering output switching pulse signal A; Anti-phase through inverting amplifier 1IC5 again at the 1IC4 output terminal, output switching pulse signal B.Sensing capacitance 2C1 and reference capacitance 2C2 carry out dividing potential drop to auxiliary signal u, through buffering and the electric capacity 3C1 of 3IC1,3C2,3C3, the coupling of 3C4 is under the effect of switching pulse signal A and B, order is passed through by resistance 3R1,3R2,3R3,3R4,3R5,3R6, electric capacity 3C5,3C6,3C7,3C8, triode 3VT1, the alternating-current switch that 3VT2 formed, and because frequency division cause, be the one-period switch, through the buffering of 4IC1 and 4IC2, order enters electric capacity 4C1 again, 4C2 and 4C3,4C4, because diode 4VD1,4VD2, and 4VD3, the unilateral conduction of 4VD4, this signal is latched at electric capacity 4C1,4C2 and 4C3, on the 4C4, these 4 electric capacity connect respectively on 4 living electron discharge switches, because DC voltage is higher than the peak value of auxiliary signal, during absence of discharge, latch mode is unaffected; During discharge, owing to be cross-linked cause, lead the pressure reduction of two peak values to be derived mutually, obtain through 5IC1 and 5IC2, and amplify 5IC3,5IC5 and 5IC4,5IC6 and setting value comparison through subsequently the two poles of the earth homophase separately, 6IC1,6IC2 and peripheral cell are formed comparer, setting value is made up of resistance 6R1,6RP1 and 6R9,6RP3, regulate resistance 6RP1 and 6RP3 and can change setting value, as surpassing setting value, then trigger the monostable circuit of forming by 7IC1 and peripheral cell and 7IC2 and peripheral cell and export high level.6IC3 and 6IC4 are anti-error establishing, and the time constant of resistance 6R6 and 6C1 and 6R14 and electric capacity 6C2 is wanted suitably.
Positive supply partly adopts a low-dropout regulator to receive on the accumulator.Negative supply is complicated slightly, adopts circuit such as vibration, inversion, rectification, filtering, voltage stabilizing.9IC1 and resistance 9R1,9R2,9R3,9R4,9R5, electric capacity 1C1,1C5,1C6 forms oscillatory circuit; The 9IC2 buffering drives the inverter of being made up of resistance 9R6,9R7,9R8,9R9, triode 9VT1,9VT2, transformer 9T1, through diode 9VD1,9VD2,9VD3,9VD4 rectification, electric capacity 9C2 filtering, receives on the low-dropout regulator 9IC3 LM2931.Originally this voltage stabilizer is a positive output voltage, with its positive output end ground connection, and the then corresponding negative output voltage that becomes of its original earth terminal then, output-9v voltage.
Because this signal Processing principle of work is planted for two periodic signal peaks before and after comparing, and then draw difference, and certainly will cause the erroneous results of the 1st comparison, be faulty action preventing, be provided with the time-delay connection circuit control output result that 8IC1 and peripheral cell and accessory circuit are formed, to correct a mistake.11C1 is a self check electric capacity.
The concrete method for making of acceleration sensor in liquid type mechanical part of the present invention: be a wall thickness 1mm, xsect is that square and interior cross section is that 3mm * 3mm, middle footpath are the glass square tube ring of 6.5mm.In the pipe ring chamber, inject central angle then and be about 170 ° thallium amalgam, bleed, seal, the pipe ring end face half, stick the aluminium foil of semicircle homalographic with it, about the thick about 0.1mm of aluminium foil.Corresponding position on another plane is sticked aluminium foil equally.Play change Jie formula sensing capacitance of sensing effect and promptly make, in circuit diagram, become Jie's formula sensing capacitance and be 2C1.Draw lead at two-plate, diameter of wire is 0.5mm, and material is selected copper.Pipe ring with automobile-used rubber (rubber that any automobile an is used) Feng Chengyi flat square, about thick 5mm, is played buffer action.Use auto plastics (automotive plastic arbitrarily) front cover again, the individual flat square of some greatly of Feng Chengyi, thick 5mm plays protective action.Be fixed on the axis of fore-and-aft direction of automobile chassis as far as possible, and see in the car both sides, pipe ring is upright annulus.When automobile produced the acceleration of plus or minus, the thallium amalgam in the square tube ring was with movement therewith, and this has just caused the electric capacity of sensing capacitance to change.Change change in voltage into by capacitance variations, the voltage that changes is carried out (when waiting) sampling, the difference of adjacent two sampled values is proportional to the size of acceleration, just draws acceleration thus.
Signal Processing of the present invention: with reference capacitance and sensing capacitance series connection, to exchanging the auxiliary signal dividing potential drop, the one-period signal storage comparer that process charge switch+peak value maintenance+discharge switch is formed, draw difference, again through amplifying several times and setting value relatively, whether decision has high level output, thereby the action of decision air bag whether.To specify 3 points here:
1, auxiliary signal: the part of metering circuit, to establish for surveying changes in capacitance, function class is similar to the local oscillation circuit of radio receiver.
2, one-period peak value storage comparer: be to realize charging and discharging switching function by the pressure reduction of AC signal peak value and direct supply; Slowly realize what peak value kept by putting soon to fill; The one-period storage that the switching signal of controlling with frequency division by being cross-linked of discharge switch realizes; In discharge, obtained comparative result by discharge switch.Draw attention to especially a bit, the output result that this comparer is the 1st time is a mistake, therefore is provided with to prolong logical the correction.
3, startup self-detection: automatically output terminal is switched to the self check end during start, pass through the regular hour again, give sensing capacitance automatically and go up suitable electric capacity, have fault, then have the light indication as Circuits System.
Relevant data in the circuit diagram of the present invention:
1IC1＝1/4LM139 1IC2＝1/4LM124 1IC3＝1/4LM124
1IC4＝1/4LM124 1IC5＝1/4LM124
3IC1＝1/4LM124
4IC1＝1/4LM124 4IC2＝1/4LM124
5IC1＝1/4LM124 5IC2＝1/4LM124 5IC3＝1/4LM124
5IC4＝1/4LM124 5IC5＝1/4LM124 5IC6＝1/4LM124
6IC6＝1/4LM139 6IC2＝1/4LM139 6IC3＝1/4LM139
6IC4＝1/4LM139
7IC1＝1/4LM139 7IC2＝1/4LM139
8IC1＝1/4LM139
9IC1＝1/4LM139 9IC2＝1/4LM124 9IC3＝LM2931
10IC1＝LM2941
11IC1＝1/4LM139 11IC2＝1/4LM139 11IC3＝1/4LM124
11IC4＝1/4LM124
Claims (3)
1, a kind of acceleration sensor in liquid type comprises glass pipe ring (1), it is characterized in that: a part is equipped with thallium amalgam (2) in the pipe ring of glass pipe ring (1); On half end face on the axial both sides end face of glass pipe ring (1) respectively correspondence be fixed with a sensing capacitance pole plate (3), draw sensing capacitance lead-in wire (4) on the sensing capacitance pole plate (3) respectively, sensing capacitance lead-in wire (4) is connected with signal processing circuit; Signal processing circuit comprises: signal oscillating part, this signal have two-way output, and one the tunnel cushions through 1IC2, drives inverter, inversion output auxiliary signal u; Another road by the 1IC3 buffering, drives frequency divider, with frequency halving; Again through 1IC4 buffering output switching pulse signal A; Anti-phase through inverting amplifier 1IC5 again at the 1IC4 output terminal, output switching pulse signal B; Sensing capacitance 2C1 and reference capacitance 2C2 carry out dividing potential drop to auxiliary signal u, under the effect of switching pulse signal A and B, order is passed through alternating-current switch, and because the frequency division cause is the one-period switch, again through buffering, order enters electric capacity, electric capacity is connected on the electron discharge switch, and during absence of discharge, latch mode is unaffected; During discharge, lead the pressure reduction at two peaks to be derived mutually, obtain through 5IC1 and 5IC2, and through subsequently the two poles of the earth homophase separately amplify with setting value relatively, as surpassing setting value, then trigger monostable circuit output high level; Positive supply partly adopts a low-dropout regulator to receive on the accumulator; Negative supply adopts circuit output negative voltages such as vibration, inversion, rectification, filtering, voltage stabilizing.
2, acceleration sensor in liquid type according to claim 1 is characterized in that: the xsect of glass pipe ring (1) is a rectangle.
3, acceleration sensor in liquid type according to claim 1 and 2, the design of glass pipe ring (1) outside has rubber sleeve (5), and the design of rubber sleeve (5) outside has plastic wrapper (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710016081A CN101093229B (en) | 2007-06-15 | 2007-06-15 | Acceleration sensor in liquid type |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200710016081A CN101093229B (en) | 2007-06-15 | 2007-06-15 | Acceleration sensor in liquid type |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101093229A true CN101093229A (en) | 2007-12-26 |
| CN101093229B CN101093229B (en) | 2010-05-19 |
Family
ID=38991592
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200710016081A Expired - Fee Related CN101093229B (en) | 2007-06-15 | 2007-06-15 | Acceleration sensor in liquid type |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101093229B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102390342A (en) * | 2011-11-15 | 2012-03-28 | 北京工商大学 | High-voltage conversion circuit for electronic security |
| CN106033089A (en) * | 2015-03-17 | 2016-10-19 | 北京自动化控制设备研究所 | A Small Volume Digital Molecular Electronic Angular Accelerometer |
| CN106124802A (en) * | 2016-03-16 | 2016-11-16 | 英麦科（厦门）微电子科技有限公司 | A kind of acceleration measurement method and hydrargyrum acceleration transducer |
| CN106324281A (en) * | 2015-07-02 | 2017-01-11 | 北京自动化控制设备研究所 | Molecular electronic angle accelerometer electromagnetism conversion unit |
| WO2017049879A1 (en) * | 2015-09-24 | 2017-03-30 | 京东方科技集团股份有限公司 | Acceleration sensor, display apparatus, detection system, and detection method |
| CN106771363A (en) * | 2017-01-06 | 2017-05-31 | 云南科威液态金属谷研发有限公司 | Condenser type liquid metal acceleration transducer |
| CN107677848A (en) * | 2017-08-07 | 2018-02-09 | 云南靖创液态金属热控技术研发有限公司 | A kind of condenser type liquid metal accelerometer |
| CN113246126A (en) * | 2021-04-30 | 2021-08-13 | 上海擎朗智能科技有限公司 | Robot movement control method, robot movement control device and robot |
-
2007
- 2007-06-15 CN CN200710016081A patent/CN101093229B/en not_active Expired - Fee Related
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102390342A (en) * | 2011-11-15 | 2012-03-28 | 北京工商大学 | High-voltage conversion circuit for electronic security |
| CN106033089A (en) * | 2015-03-17 | 2016-10-19 | 北京自动化控制设备研究所 | A Small Volume Digital Molecular Electronic Angular Accelerometer |
| CN106324281A (en) * | 2015-07-02 | 2017-01-11 | 北京自动化控制设备研究所 | Molecular electronic angle accelerometer electromagnetism conversion unit |
| WO2017049879A1 (en) * | 2015-09-24 | 2017-03-30 | 京东方科技集团股份有限公司 | Acceleration sensor, display apparatus, detection system, and detection method |
| US9869693B2 (en) | 2015-09-24 | 2018-01-16 | Boe Technology Group Co., Ltd. | Acceleration sensor, display device, detecting system and detecting method |
| CN106124802A (en) * | 2016-03-16 | 2016-11-16 | 英麦科（厦门）微电子科技有限公司 | A kind of acceleration measurement method and hydrargyrum acceleration transducer |
| CN106771363A (en) * | 2017-01-06 | 2017-05-31 | 云南科威液态金属谷研发有限公司 | Condenser type liquid metal acceleration transducer |
| CN107677848A (en) * | 2017-08-07 | 2018-02-09 | 云南靖创液态金属热控技术研发有限公司 | A kind of condenser type liquid metal accelerometer |
| CN113246126A (en) * | 2021-04-30 | 2021-08-13 | 上海擎朗智能科技有限公司 | Robot movement control method, robot movement control device and robot |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101093229B (en) | 2010-05-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101093229B (en) | Acceleration sensor in liquid type | |
| CN106329987B (en) | Self-powered wireless vibration autonomous alarm system and method thereof | |
| US10031154B2 (en) | Inertial force sensor | |
| CN201935729U (en) | S-shaped weighing sensor | |
| CN103066989B (en) | Single power electric level shift circuit with digital filtering function | |
| CN212082519U (en) | Water level detection circuit, water level detector and electronic equipment | |
| CN201051107Y (en) | Liquid acceleration sensor | |
| CN105302018B (en) | Drive control circuit and industrial control equipment | |
| CN209766595U (en) | overlength standby device | |
| US10044219B2 (en) | Power supply apparatus | |
| Ikehashi et al. | An RF MEMS variable capacitor with intelligent bipolar actuation | |
| CN107782298B (en) | Triaxial MEMS gyroscope | |
| CN202563666U (en) | Wireless remote control coding chip and application circuit thereof | |
| CN206440659U (en) | A kind of CPLD humidity measuring circuits | |
| CN203460711U (en) | Electric vehicle meter | |
| CN202444417U (en) | Startup automatic starting circuit for long-distance meter reading communication module | |
| CN102420568B (en) | Oscillator with function of temperature compensation | |
| CN209730854U (en) | A kind of inexpensive automatic inflatable electric control circuit of battery | |
| CN213948272U (en) | Control circuit for touch type automobile reading lamp | |
| CN208569864U (en) | A kind of mining wireless velocity sensor | |
| CN207005186U (en) | A kind of damping device | |
| CN103633939A (en) | Oscillator | |
| CN208572053U (en) | Timing switch circuit and electronic equipment | |
| CN207184111U (en) | A kind of charging base | |
| CN202190255U (en) | High-precision oscillator |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100519 Termination date: 20120615 |