CN201286088Y - Microampere stage ultra-low power consumption finger-simulated inductive switch circuit - Google Patents
Microampere stage ultra-low power consumption finger-simulated inductive switch circuit Download PDFInfo
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- CN201286088Y CN201286088Y CNU2008200423557U CN200820042355U CN201286088Y CN 201286088 Y CN201286088 Y CN 201286088Y CN U2008200423557 U CNU2008200423557 U CN U2008200423557U CN 200820042355 U CN200820042355 U CN 200820042355U CN 201286088 Y CN201286088 Y CN 201286088Y
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- 230000001939 inductive effect Effects 0.000 title claims description 20
- 239000003990 capacitor Substances 0.000 claims description 30
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 230000010355 oscillation Effects 0.000 abstract description 10
- 238000004088 simulation Methods 0.000 abstract description 3
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 230000006698 induction Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 4
- 230000006641 stabilisation Effects 0.000 description 2
- 238000011105 stabilization Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000005622 photoelectricity Effects 0.000 description 1
- 230000036632 reaction speed Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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Abstract
The utility model relates to an inducted switch circuit, especially to a microampere level ultra-low power consumption simulation finger inducted switch circuit. The microampere level ultra-low power consumption simulation finger inducted switch circuit comprises a monotube oscillation unit, a rectifying unit and a voltage compare unit, the oscillation unit generates oscillation waveform, outputs direct current voltage after being rectified by the rectifying unit, and outputs judge signal after comparing the voltage of the voltage compare unit. The utility model is easy to start oscillation by changing the LC oscillation form into a capacity three-point mode from the original capacity-feedback mode, the oscillation is stable, and the low-power consumption can be realized by selecting a resistance with large resistance value in the emitter and matching bias regulated base.
Description
Technical field
The utility model relates to a kind of inductive switch circuit, especially a kind of microampere stage ultra-low power consumption finger-simulated inductive switch circuit.
Background technology
Have very early as inductive switch, and kind is a lot, have photoelectricity, electromagnetism, power is quick or the like, there have to be contact, that have induction type, have induction to cause frequency change, there is induction to make that vibration is left alone without help shakes, also have the AC field sensitivity ... but require operating period several years electronic equipment or instrument again for a powered battery, all have a problem that power consumption is too big.Those switches are wanted several milliamperes or tens milliamperes of operating currents mostly.
The ATA2508 as ATLAB company to have occurred be the IC of the touch chip of representative to development of computer in recent years, and performance is well, but during low-power consumption, still want 60 microamperes, and price is higher.
Recently also have a kind of capacitive induction switch, it is after adding induction, and with the variation that single-chip microcomputer is surveyed its frequency, analog circuit adds mcu programming, has both bothered and the cost height.
The utility model content
In order to solve the low-power consumption of above-mentioned inductive switch circuit, with the product requirement such as reliable and stable, economic cheap that advances to take into account circuit, the utility model provides a kind of microampere stage ultra-low power consumption finger-simulated inductive switch circuit.
The technical scheme that its technical problem that solves the utility model adopts is: a kind of microampere stage ultra-low power consumption finger-simulated inductive switch circuit, comprise single tube oscillating unit, rectification unit and voltage comparison unit, described oscillating unit produce waveform through rectification unit rectification output dc voltage after, compare back output with the voltage of voltage comparison unit and judge signal.
Particularly: comprise the sensing chip, triode T1, inductance L 1, capacitor C 3, capacitor C 4 and resistance R 3 compositions that are used for the finger sensing situation of movement in the described single tube oscillating unit; Sensing chip is connected with the collector electrode of triode T1, and inductance L 1 one ends also connect the collector electrode of triode T1, another termination power; Capacitor C 3, capacitor C 4 are drawn from inductance L 1 two ends, and the other end all is connected on the emitter of triode T1, constitute the capacitance three-point type vibration; The emitter of triode T1 is connected with resistance R 3, the other end ground connection of resistance R 3; Base terminal at triode T1 is provided with resistance R 1 and capacitor C 1, is provided with resistance R 2 and capacitor C 2 at the power end of inductance L 1.Described rectification unit is by capacitor C 5, capacitor C 6 and diode D1, diode D2, constitute voltage doubling rectifing circuit as the resistance R 4 of rectification load.Described voltage comparison unit is made of comparator IC and resistance R 6, resistance R 7, resistance R 5, capacitor C 7; Termination supply voltage on the resistance R 6, resistance R 7 lower end ground connection, its partial pressure value is a comparator IC input reference, the signal that resistance R 5 transmits is compared with benchmark and is determined whether comparator IC output overturns.
Wherein: described sensing chip is sheet metal or single face copperclad plate; Described T1 is 9018 high-frequency triodes; L1 is 47 microhenry colour coding inductance, and C3 is 22PF, and C4 is 39～68PF electric capacity; Resistance R 3 is 470K～1M ohm; Resistance R 1 is 4.7～6.8M ohm; Capacitor C 2 is 20～1000PF; Described resistance R 4 〉=10M ohm.Described resistance R 6 is 4.7～7.5M ohm; Resistance R 7 is 30～200K ohm.
Microampere stage ultra-low power consumption finger-simulated inductive switch circuit described in the utility model changes capacitance three-point type to the LC oscillation form into by original capacitive feedback mode, easier like this starting of oscillation, and vibrational stabilization.Used the big resistance in resistance hundreds of K Europe instead at emitter, the adjustment base bias of joining again and realized low-power consumption.Power consumption has reduced, but amplitude is with regard to electric current, output amplitude be full amplitude (with power supply than), if operating current is 5 microamperes, the width of cloth descends very fast.Test has confirmed this point, and several milliamperes or tens milliamperes workabilities of routine oscillator have only about 100 millivolts, if reduce to 3 microamperes again, oscillation amplitude has only tens millivolts.Certainly can not directly use and will do conversion for so little output.The voltage upset is carried out with the low power consumption voltage comparator in the back for this reason, for the working voltage comparator, oscillator signal must be become DC level again, and the centre adds rectifying device again.Such double pole triode, a comparator adds that several capacitance-resistances and an inductance just constitute all material cost, economical and practical, power consumption is very low again, meets the demands, and has realized low-power consumption simulation finger inductive switch.
Description of drawings
Below in conjunction with drawings and Examples the utility model is further specified.
Fig. 1 is the utility model circuit structure diagram.
Fig. 2 is the utility model oscillating unit circuit structure diagram.
Fig. 3 is the utility model rectification unit circuit structure diagram.
Fig. 4 is the utility model voltage comparison unit circuit structure diagram.
Embodiment
A kind of microampere stage ultra-low power consumption finger-simulated inductive switch circuit as shown in Figure 1, comprise single tube oscillating unit, rectification unit and voltage comparison unit, described oscillating unit produce waveform through rectification unit rectification output dc voltage after, compare back output with the voltage of voltage comparison unit and judge signal.
As shown in Figure 2, comprise sensing chip, triode T1, inductance L 1, capacitor C 3, capacitor C 4 and resistance R 3 compositions that are used for the finger sensing situation of movement in the described single tube oscillating unit; Sensing chip is connected with the collector electrode of triode T1, and inductance L 1 one ends also connect the collector electrode of triode T1, another termination power; Capacitor C 3, capacitor C 4 are drawn from inductance L 1 two ends, and the other end all is connected on the emitter of triode T1, constitute the capacitance three-point type vibration; The emitter of triode T1 is connected with resistance R 3, the other end ground connection of resistance R 3; Base terminal at triode T1 is provided with resistance R 1 and capacitor C 1, is provided with resistance R 2 and capacitor C 2 at the power end of inductance L 1.
Constitute capacitance three-point type common base oscillator with double pole triode.Frequency of oscillation can not be selected too lowly, and little because of the finger sensing chip, capacitance variations has only several ppF to tens ppF, and vibration be arranged at ordinary times, and after the finger induction, promptly increase small capacitance after, vibration stops.Frequency can not be selected De Taigao, because of power consumption and frequency are positive relation-changings.Therefore optional frequency is between 1～5MH.Frequency (wherein also has distribution grid mainly by the L1 decision.Check that this circuit will be with vibrational stabilization at ordinary times, add the finger induction after, vibration stops to be principle electric capacity), auxilliary C1, C2.Power consumption is by R3 and base bias R1 decision.R3 is a very big resistance of resistance.Power consumption conforms to requirement.When noting adding detecting instruments such as oscilloscope, the influence that the electric capacity of detecting instrument brings.
Wherein, sensing chip is sheet metal or single face copperclad plate; Described T1 is 9018 high-frequency triodes; L1 is 47 microhenry colour coding inductance, and C3 is 22PF, and C4 is 39～68PF electric capacity; Resistance R 3 is 470K～1M ohm; Resistance R 1 is 4.7～6.8M ohm; Capacitor C 2 is 20～1000PF.
As shown in Figure 3, described rectification unit is by capacitor C 5, capacitor C 6 and diode D1, diode D2, constitute voltage doubling rectifing circuit as the resistance R 4 of rectification load.Wherein, resistance R 4 〉=10M ohm.This is a universal circuit, but is voltage multiplying rectifier here, and components and parts are suitable, and D1D2 can not be with 4001 these class low-frequency tubes.C3 can not obtain too big, otherwise voltage can not fill, and resistance R 4 is that resistance is very big, even open circuit as the discharge usefulness of C3, and reaction speed is used.
As shown in Figure 4, described voltage comparison unit is made of comparator IC and resistance R 6, resistance R 7, resistance R 5, capacitor C 7; Termination supply voltage on the resistance R 6, resistance R 7 lower end ground connection, its partial pressure value is a comparator IC input reference, the signal that resistance R 5 transmits is compared with benchmark and is determined whether comparator IC output overturns.Wherein, resistance R 6 is 4.7～7.5M ohm; Resistance R 7 is 30～200K ohm.General connection.Signal voltage that one of them input termination front is come, another termination reference data VREF, this is required decide by the single-chip microcomputer input, if requirement is shown with sensor signal by low level to the high level change list, positive input termination reference data then.Output has added R8 resistance again, power consumption when at this moment adjusting the finger sense.Static about 1 microampere of comparator less than 3 microamperes, requires single-chip microcomputer input high impedance after having added R8, as being input as better with the A/D mouth during upset.As power consumption (increasing by 2～3 microamperes again) when not requiring work, can short circuit R8.
The utility model is highly suitable for battery and powers as unique energy, requires several years operating period, needs the electronic product of inductive switch again.For example at powered battery portable hand-held measuring instrument, game machine ... electronic product can be used well.
In battery powered game machine, because switch is induction type, need not contact, so sensing chip can be contained in the inside of panel, appearance does not have vestige, more seems mysterious, and outward appearance is also beautiful.
In embedded handheld instrument, only need two, three switches sometimes, at this moment save money, save trouble with this patent switch, save space, outward appearance is also totally attractive in appearance.
Example has obtained good application on Heat distribution meter again.Have only the 7-8 microampere during single-chip microcomputer standby, add 4～5 microamperes of finger inductive switch power consumptions, add single-chip microcomputer work power consumption, on average get off less than 20 microamperes yet, so for the lithium battery of a joint 1.2 ampere-hours, keeping work in 10 years has not had with regard to any problems.
Claims (7)
1. microampere stage ultra-low power consumption finger-simulated inductive switch circuit, it is characterized in that: comprise single tube oscillating unit, rectification unit and voltage comparison unit, described oscillating unit produce waveform through rectification unit rectification output dc voltage after, compare back output with the voltage of voltage comparison unit and judge signal.
2. microampere stage ultra-low power consumption finger-simulated inductive switch circuit according to claim 1 is characterized in that: comprise the sensing chip, triode T1, inductance L 1, capacitor C 3, capacitor C 4 and resistance R 3 compositions that are used for the finger sensing situation of movement in the described single tube oscillating unit; Sensing chip is connected with the collector electrode of triode T1, and inductance L 1 one ends also connect the collector electrode of triode T1, another termination power; Capacitor C 3, capacitor C 4 are drawn from inductance L 1 two ends, and the other end all is connected on the emitter of triode T1, constitute the capacitance three-point type vibration; The emitter of triode T1 is connected with resistance R 3, the other end ground connection of resistance R 3; Base terminal at triode T1 is provided with resistance R 1 and capacitor C 1, is provided with resistance R 2 and capacitor C 2 at the power end of inductance L 1.
3. microampere stage ultra-low power consumption finger-simulated inductive switch circuit according to claim 1 is characterized in that: described rectification unit is by capacitor C 5, capacitor C 6 and diode D1, diode D2, constitute voltage doubling rectifing circuit as the resistance R 4 of rectification load.
4. microampere stage ultra-low power consumption finger-simulated inductive switch circuit according to claim 1 is characterized in that: described voltage comparison unit is made of comparator IC and resistance R 6, resistance R 7, resistance R 5, capacitor C 7; Termination supply voltage on the resistance R 6, resistance R 7 lower end ground connection, its partial pressure value is a comparator IC input reference, the signal that resistance R 5 transmits is compared with benchmark and is determined whether comparator IC output overturns.
5. microampere stage ultra-low power consumption finger-simulated inductive switch circuit according to claim 2 is characterized in that: described sensing chip is sheet metal or single face copperclad plate; Described T1 is 9018 high-frequency triodes; L1 is 47 microhenry colour coding inductance, and C3 is 22PF, and C4 is 39～68PF electric capacity; Resistance R 3 is 470K～1M ohm; Resistance R 1 is 4.7～6.8M ohm; Capacitor C 2 is 20～1000P.
6. microampere stage ultra-low power consumption finger-simulated inductive switch circuit according to claim 3 is characterized in that: described resistance R 4 〉=10M ohm.
7. microampere stage ultra-low power consumption finger-simulated inductive switch circuit according to claim 4 is characterized in that: described resistance R 6 is 4.7～7.5M ohm; Resistance R 7 is 30～200K ohm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200423557U CN201286088Y (en) | 2008-07-31 | 2008-07-31 | Microampere stage ultra-low power consumption finger-simulated inductive switch circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008200423557U CN201286088Y (en) | 2008-07-31 | 2008-07-31 | Microampere stage ultra-low power consumption finger-simulated inductive switch circuit |
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| CN201286088Y true CN201286088Y (en) | 2009-08-05 |
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| CNU2008200423557U Expired - Lifetime CN201286088Y (en) | 2008-07-31 | 2008-07-31 | Microampere stage ultra-low power consumption finger-simulated inductive switch circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101968551A (en) * | 2010-08-26 | 2011-02-09 | 刘家发 | Portable metal detecting device |
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2008
- 2008-07-31 CN CNU2008200423557U patent/CN201286088Y/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101968551A (en) * | 2010-08-26 | 2011-02-09 | 刘家发 | Portable metal detecting device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20090805 |