CN205754257U - A kind of Hall switch offset voltage eliminates circuit - Google Patents
A kind of Hall switch offset voltage eliminates circuit Download PDFInfo
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- CN205754257U CN205754257U CN201620546786.1U CN201620546786U CN205754257U CN 205754257 U CN205754257 U CN 205754257U CN 201620546786 U CN201620546786 U CN 201620546786U CN 205754257 U CN205754257 U CN 205754257U
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Abstract
The utility model proposes a kind of Hall switch offset voltage and eliminate circuit, including hall sensing district, described hall sensing district accesses continuous current, described hall sensing district accesses four groups of non-overlapping switching signals at four direction respectively, and field signal is converted into the voltage signal of induction electromotive force, described voltage signal utilizes four groups of switch clock signal to control transmission gate and difference amplifier obtains the first amplification signal and second and amplifies signal, and by four groups of switching signals, the first amplification signal and the second amplification signal are averaged, eliminate the difference of the Hall voltage value of four direction, four direction 360 degree is fully eliminated the imbalance of all directions by this utility model, and utilize chopper amplifier to amplify, eliminate the imbalance that circuit brings, it is thus possible to really eliminate imbalance, obtain a stable magnetic field upset point.
Description
Technical field
This utility model belongs to galvanomagnetic-effect technical field, eliminates circuit particularly to a kind of Hall switch offset voltage.
Background technology
At present, Hall effect is the one of galvanomagnetic-effect, this phenomenon be American Physical scholar's Hall (A.H.Hall,
1855 1938) found when studying the conductive mechanism of metal in 1879.When electric current is perpendicular to external magnetic field by conductor,
The direction being perpendicular to electric current and magnetic field can produce an additional electric field, thus produce electric potential difference at the two ends of conductor, and this phenomenon is just
Being Hall effect, this electric potential difference is also referred to as Hull voltage.
Utilize the Hall switch that Hall effect designs, have contactless, low-power consumption, length in service life, response frequency high, can
By features such as property are good, it is widely used in various electronic equipment, has replaced traditional touch switch.
Conventional Hall switch is as it is shown in figure 1, include that hall sensing district, biased reference, voltage amplifier, sluggishness compare
The modules such as device, agitator, logic control circuit, latch.Biased reference provides bias current that whole on-off circuit needs, partially
Put voltage and reference voltage etc., after magnetic field is by hall sensing district, produce hall electromotive force at voltage amplifier two input
VH, is compared by the reference voltage produced with biased reference after the amplification of voltage amplifier, then by control circuit, and lock
The operation control of storage, finally obtains the output of 0 or 1.Wherein agitator is responsible for producing the clock signal of fixed frequency, available
Make internal switching signal and fixing wake-up signal.
Hall sensing district typically uses N or P-type semiconductor to design, during the generation of hall electromotive force, and electric current
Direction, lattice direction, lattice defect, the difference of hall sensing district graphics shape all can produce imbalance, in particular with system pair
The low-power consumption of Hall switch device, high sensitivity, high coherence request is more and more higher, and the design of Hall switch is to offset voltage
Eliminate circuit and propose new requirement.
Therefore, in view of such scheme is in place of the disappearance that actual fabrication and enforcement use, and is revised, improved, with
Time in line with the spirit asked and theory, and by the knowledge of specialty, the auxiliary of experience, and after clever thought in many ways, test, side is founded
Going out this utility model, spy reoffers a kind of Hall switch offset voltage and eliminates circuit.
Utility model content
The utility model proposes a kind of Hall switch offset voltage and eliminate circuit, solve Hall switch in prior art and lose
Adjust the problem that voltage can not thoroughly eliminate.
The technical solution of the utility model is achieved in that Hall switch offset voltage eliminates circuit, including Hall sense
Answering district, hall sensing district accesses continuous current, and hall sensing district accesses four groups of non-overlapping switch letters at four direction respectively
Number, the outfan in hall sensing district connects average circuit, and average circuit connects hysteresis comparator circuit.
As one preferred embodiment, four groups of non-overlapping switching signal input angle are followed successively by: 0 °, 90 °,
180°、270°。
As one preferred embodiment, average circuit includes a difference amplifier, two inputs of difference amplifier
End is connected to the first electric capacity and the second electric capacity.The imbalance that elimination itself brings.
As one preferred embodiment, hysteresis comparator circuit includes a hysteresis comparator, two of hysteresis comparator
Input is connected to the 3rd electric capacity and the 4th electric capacity respectively.
As one preferred embodiment, difference amplifier is chopper amplifier.
As one preferred embodiment, continuous current utilizes electric power bias circuit to provide, and it is unrelated with PVT.
As one preferred embodiment, hall sensing district is Hall switch based on CMOS technology.
After have employed technique scheme, the beneficial effects of the utility model are: by four groups of switching signals by first
Amplify signal and the second amplification signal is averaged, use and leave the first amplification signal and the second amplification signal in corresponding electric capacity
On, then amplify signal and second by first and amplify signal averaging to same electric capacity.By four groups of switching signals by
After one amplification signal and the second amplification signal are averaged, further with hysteresis comparator output comparison signal, thus according to
Magnetic field intensity obtains the high or low of output signal.Described four groups of non-overlapping switching signals by the conducting of switching capacity with
Disconnect conducting and the disconnection controlling switch.This utility model can substantially eliminate the individuality brought because of production, process deviation etc.
Difference and dysbiosis, by 4 groups of non-overlapping switching signals, by four direction 360 degree without dead angle, all detect and put down
All, so can fully eliminate the imbalance of all directions, and utilize chopper amplifier to amplify, eliminate the imbalance that circuit brings, from
And can really eliminate imbalance, obtain a stable magnetic field upset point.
Accompanying drawing explanation
In order to be illustrated more clearly that this utility model embodiment or technical scheme of the prior art, below will be to embodiment
Or the required accompanying drawing used is briefly described in description of the prior art, it should be apparent that, the accompanying drawing in describing below is only
It is embodiments more of the present utility model, for those of ordinary skill in the art, before not paying creative work
Put, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is that existing Hall switch offset voltage eliminates circuit diagram；
Fig. 2 a is the schematic diagram in hall sensing district；
Fig. 2 b is the circuit diagram of average circuit；
Fig. 2 c is the circuit diagram of hysteresis comparator circuit；
Fig. 3 is the period-luminosity relation figure of switching signal.
Detailed description of the invention
Below in conjunction with the accompanying drawing in this utility model embodiment, the technical scheme in this utility model embodiment is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of this utility model rather than whole
Embodiment.Based on the embodiment in this utility model, those of ordinary skill in the art are not under making creative work premise
The every other embodiment obtained, broadly falls into the scope of this utility model protection.
This Hall switch offset voltage eliminates circuit, and including hall sensing district, described hall sensing district accesses continuous current,
Described hall sensing district accesses four groups of non-overlapping switching signals at four direction respectively, and field signal is converted into sensing
The voltage signal of electromotive force, described voltage signal utilizes four groups of switch clock signal to control transmission gate and difference amplifier obtains four
Group the first amplification signal and second amplifies signal, and amplifies signal and the second amplification letter by four group first by four groups of switching signals
Number it is averaged, eliminates the difference of the Hall voltage value of four direction.
Concrete, refer to as shown in Figure 2 a, this hall sensing district 0 °, 90 °, 180 °, on 270 ° of four directions respectively
It is provided with signal access point A, B, C and D, and four signals access point A, B, C and D are respectively by P-channel metal-oxide-semiconductor and N-channel MOS
Pipe accesses continuous current and four groups of switching signals not overlapped, and then field signal is transformed into induction electric by hall sensing district
The voltage signal of gesture.
Refer to Fig. 2 b below, four signals access point A, B, C and D are connected to average circuit, average circuit, voltage the most respectively
Signal utilizes four groups of clock signals of switching to control transmission gates and difference amplifier obtains four group first and amplifies signal and second and put
Big signal, and by four groups of switching signals, four group first is amplified signal and second and amplify signal and be averaged, first put first
Signal and the second amplification signal greatly leaves on corresponding electric capacity, then amplifies signal and second by first and amplifies signal averaging to same
On one electric capacity.
Referring again to Fig. 2 c, average circuit is also associated with eliminating circuit, eliminates circuit and use sluggishness ratio in the present embodiment
Relatively circuit, hysteresis comparator circuit includes a hysteresis comparator, will amplify signal to four group first and the second amplification signal is put down
After all, recycling hysteresis comparator carries out sluggishness to the signal after average further and compares, and then exports comparison signal, thus root
The high or low of output signal is obtained according to magnetic field intensity.
Referring again to Fig. 3, four groups of switching signals are believed to average by first group of switching signal to the 4th group switching signal again
Number carry out successively, constitute a working cycle, circulate continuously.
It should be noted that in this utility model, difference amplifier uses chopper amplifier, can eliminate transformation effectively
The imbalance that device itself brings, cycle of switching signal as it is shown on figure 3, due to 0 °, 90 °, 180 °, on 270 ° of four directions point
Not arranging signal access point A, B, C and D, therefore the switching signal cycle of four signal access point receptions staggers successively, and time
Clock signal be positioned at four groups of switching signals after, the cycle staggered with the switching signal cycle.
This Hall switch offset voltage eliminates circuit, can substantially eliminate the individuality brought because of production, process deviation etc.
Difference and dysbiosis, by 4 groups of non-overlapping switching signals, by four direction 360 degree without dead angle, all detect and put down
All, so can fully eliminate the imbalance of all directions, and utilize chopper amplifier to amplify, eliminate the imbalance that circuit brings, from
And can really eliminate imbalance, obtain a stable magnetic field upset point, and compared with the design of prior art, Ben Huoer
The element that switch offset voltage removing method uses is less, and circuit structure is simpler, has saved cost.
The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model, all at this
Within the spirit of utility model and principle, any modification, equivalent substitution and improvement etc. made, should be included in this utility model
Protection domain within.
Claims (7)
1. Hall switch offset voltage eliminates a circuit, including hall sensing district, it is characterised in that described hall sensing district connects
Entering continuous current, described hall sensing district accesses four groups of non-overlapping switching signals, described Hall sense at four direction respectively
The outfan answering district connects average circuit, and described average circuit connects hysteresis comparator circuit.
Hall switch offset voltage the most according to claim 1 eliminate circuit, it is characterised in that described four groups non-overlapping
Switching signal input angle be followed successively by: 0 °, 90 °, 180 °, 270 °.
Hall switch offset voltage the most according to claim 1 eliminates circuit, it is characterised in that described average circuit includes
One difference amplifier, two inputs of described difference amplifier are connected to the first electric capacity and the second electric capacity.
Hall switch offset voltage the most according to claim 1 eliminates circuit, it is characterised in that described hysteresis comparator circuit
Including a hysteresis comparator, two inputs of described hysteresis comparator are connected to the 3rd electric capacity and the 4th electric capacity respectively.
Hall switch offset voltage the most according to claim 3 eliminates circuit, it is characterised in that described difference amplifier is
Chopper amplifier.
Hall switch offset voltage the most according to claim 1 eliminates circuit, it is characterised in that described continuous current utilizes
Electric power bias circuit provides.
Hall switch offset voltage the most according to claim 1 eliminates circuit, it is characterised in that described hall sensing district is
Hall switch based on CMOS technology.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620546786.1U CN205754257U (en) | 2016-06-07 | 2016-06-07 | A kind of Hall switch offset voltage eliminates circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620546786.1U CN205754257U (en) | 2016-06-07 | 2016-06-07 | A kind of Hall switch offset voltage eliminates circuit |
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| CN205754257U true CN205754257U (en) | 2016-11-30 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112526191A (en) * | 2020-11-20 | 2021-03-19 | 苏州纳芯微电子股份有限公司 | Hall sensing circuit |
| CN116973816A (en) * | 2023-09-21 | 2023-10-31 | 昂赛微电子（上海）有限公司 | Magnetic field zero-crossing detection control circuit and method and Hall magneto-dependent trigger chip |
-
2016
- 2016-06-07 CN CN201620546786.1U patent/CN205754257U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112526191A (en) * | 2020-11-20 | 2021-03-19 | 苏州纳芯微电子股份有限公司 | Hall sensing circuit |
| CN112526191B (en) * | 2020-11-20 | 2022-09-30 | 苏州纳芯微电子股份有限公司 | Hall sensing circuit |
| CN115598395A (en) * | 2020-11-20 | 2023-01-13 | 苏州纳芯微电子股份有限公司（Cn） | Hall sensing circuit |
| CN115598395B (en) * | 2020-11-20 | 2024-01-30 | 苏州纳芯微电子股份有限公司 | Hall sensing circuit |
| CN116973816A (en) * | 2023-09-21 | 2023-10-31 | 昂赛微电子（上海）有限公司 | Magnetic field zero-crossing detection control circuit and method and Hall magneto-dependent trigger chip |
| CN116973816B (en) * | 2023-09-21 | 2023-12-08 | 昂赛微电子（上海）有限公司 | Magnetic field zero-crossing detection control circuit and method and Hall magneto-dependent trigger chip |
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