CN208833258U - A kind of Hall circuit of adaptive differential input - Google Patents

Abstract

The utility model discloses a kind of Hall circuits of adaptive differential input, including sequentially connected double Hall circuits, amplifying circuit, comparison circuit, A/D conversion circuit and output circuit, the Hall circuit of the adaptive differential input further includes the first Hall sensor, the second Hall sensor and power circuit, and first Hall sensor and second Hall sensor are connect with double Hall circuits.The utility model is using pair difference of Hall difference circuit structure induced magnetic field variable quantities, the absolute change amount in single sensor sensing magnetic field is replaced, so that temperature drift, the fluctuation of manufacture craft, the influence to performance parameters such as discreteness of bias magnetic field are reduced to a minimum；The faint variable quantity in magnetic field is greatly detected simultaneously, to improve the corresponding detecting distance by induction gear of sensor, the application range to extend one's service.

Description

A kind of Hall circuit of adaptive differential input

Technical field

It is inputted the utility model relates to a kind of Hall gear sensor technical field more particularly to a kind of adaptive differential Hall circuit.

Background technique

Hall sensor is widely applied to industry, car industry, computer, mobile phone and emerging consumer electronics field.Hall effect Answering gear sensor is a kind of important automatic detection element, and the application especially on automobile increasingly increases, main to realize The detection of position, speed and direction.But existing Hall sensor by temperature drift, manufacture craft and bias magnetic field from It is very big to dissipate property hardness, testing result inaccuracy, in addition because detecting the faint variation in magnetic field, sensor needs are very close to being felt It answers gear just and can be carried out detection, because detection application range is by many limitations.

Utility model content

The technical problems to be solved in the utility model is in order to overcome the defects of the prior art, now to provide a kind of adaptive The Hall circuit of Differential Input, using the difference of double Hall difference circuit structure induced magnetic field variable quantities, to replace single sensor The absolute change amount of induced magnetic field so that temperature drift, the fluctuation of manufacture craft, bias magnetic field discreteness etc. to performance parameters Influence be reduced to a minimum；The faint variable quantity in magnetic field is greatly detected simultaneously, so that it is corresponding to improve sensor By the detecting distance of induction gear, the application range that extends one's service.

The utility model is to solve above-mentioned technical problem by following technical proposals:

A kind of Hall circuit of adaptive differential input of the utility model, it is characterized in that, the adaptive differential input Hall circuit include sequentially connected double Hall circuits, amplifying circuit, comparison circuit, A/D conversion circuit and output circuit, institute The Hall circuit for stating adaptive differential input further includes the first Hall sensor, the second Hall sensor and power circuit, described First Hall sensor and second Hall sensor are connect with double Hall circuits, and the power circuit is separately connected institute Double Hall circuits, the amplifying circuit, the comparison circuit, the A/D conversion circuit and the output circuit are stated, described pair suddenly Your circuit is used to incude by first Hall sensor and second Hall sensor external magnetic field variation and generates the One voltage signal and second voltage signal, the amplifying circuit are used for the first voltage signal and the second voltage signal Difference amplify and obtain amplified differential signal, the amplified differential signal is compared production by the comparison circuit It is born from adaptation comparison signal, the A/D conversion circuit is used to convert digital comparison signal, institute for the adaptive comparison signal It states power circuit and double Hall circuits, amplifying circuit, comparison circuit, A/D conversion circuit and output circuit offer power supply is provided Power.

Preferably, the power circuit includes sequentially connected internal electric source, biasing circuit and oscillating circuit, the inside Power supply is that the Hall circuit of adaptive differential input generates the DC voltage of 5V, and the biasing circuit is inclined for providing direct current Voltage is set, the oscillating circuit generates clock signal for providing frequency of oscillation.

The positive effect of the utility model is:

The utility model is using pair difference of Hall difference circuit structure induced magnetic field variable quantities, to replace single sensor sense Answer the absolute change amount in magnetic field so that temperature drift, the fluctuation of manufacture craft, bias magnetic field discreteness etc. to performance parameters Influence is reduced to a minimum；The faint variable quantity for greatly detecting magnetic field simultaneously, so that improving sensor corresponds to quilt The detecting distance of induction gear, the application range to extend one's service, the utility model have the symmetry of good magnetic field switching point And consistency, so for the target toothing for uniformly repeating distribution, in entire effectively detecting distance range and temperature range, It can guarantee to export an accurate duty ratio, for uneven duplicate target toothing, pulse width can automatically and target The width of tooth matches.

Detailed description of the invention

Fig. 1 is the electrical block diagram of the preferred embodiment of the utility model.

Fig. 2 is the structural schematic diagram of the utility model induction gear.

Fig. 3 is the waveform diagram of the utility model induction gear.

Specific embodiment

The utility model is further illustrated below by the mode of embodiment, but is not therefore limited in the utility model Among the embodiment described range.

Referring to Figure 1, a kind of Hall circuit of adaptive differential input of the utility model, is arranged in the signal such as Fig. 2 4 position of processing circuit, the utility model include sequentially connected double Hall circuits 4, amplifying circuit 5, comparison circuit 6, A/D conversion The Hall circuit of circuit 7 and output circuit 8, adaptive differential input further includes the first Hall sensor 2, the second Hall sensor 3 and power circuit, the first Hall sensor 2 and the second Hall sensor 3 connect with double Hall circuits 4, the first Hall sensor 2, the second Hall sensor 3 is arranged in 13 neighbouring position of lift magnet.Power circuit is separately connected double Hall circuits 4, amplification electricity Road 5, comparison circuit 6, A/D conversion circuit 7 and output circuit 8, double Hall circuits 4 are used for through the first Hall sensor 2 and the Two Hall sensors 3 induction external magnetic field changes and generates first voltage signal and second voltage signal, and amplifying circuit 5 is used for will The difference of first voltage signal and second voltage signal, which amplifies, obtains amplified differential signal, after comparison circuit 6 will amplify Differential signal be compared and generate adaptive comparison signal, A/D conversion circuit 7 is used to convert number for adaptive comparison signal Word comparison signal, power circuit provide double Hall circuits 4, amplifying circuit 5, comparison circuit 6, A/D conversion circuit 7 and output circuit 8 provide mains power.

Preferably, power circuit includes sequentially connected internal electric source 9, biasing circuit 11 and oscillating circuit 10, internal electricity Source 9 is that the Hall circuit of adaptive differential input generates the DC voltage of 5V, and biasing circuit 11 is used to provide DC offset voltage, Oscillating circuit 10 generates clock signal for providing frequency of oscillation.Comprising: double Hall Plate differential input structures, for feeling The voltage signal answered external magnetic field to change and generated；Amplifying circuit 5, the faint small signal for being used to sense Hall Plate carry out Amplification；Then convert digital signal according to required logic for input signal by comparing circuit 6, then by A/D conversion with it is defeated Circuit 8 out obtain the conversion that low and high level is exported as caused by input signal.In addition there are internal electric source 9, BIAS and oscillating circuit 10 provide stable operating condition for chip.The adaptive structure of chip can make operating point and point of release with external magnetic field Change and adjusts.The Differential Input for double Hall Plates that the utility model uses effectively improves single Hall Plate induction weak signal hardly possible Problem, so that the distance of chip induction gear be made to become larger.

The utility model is the working principle based on Hall effect, across Hall integrated circuit bias magnetic field intensity and Direction will change with the continuous variation of the tooth top of moving gear, tooth paddy position, thus the first Hall sensor of difference 2 and second the magnetic field signal difference that senses of Hall sensor 3 be transformed to differential voltage signal, this faint voltage signal warp After crossing amplification and adaptively comparing, the switch unit circuit gone inside trigger circuit carries out the movement of on and off, then in the electricity The output end on road just produces the low and high level digital signal corresponding to gear shape.

The magnetic line of force can deviate original direction near the permeability magnetic materials such as iron class and be distorted, thus magnetic line of force direction and Magnetic field strength can change with the movement of iron type gear.If a Hall Plate is facing to the tooth top of gear, another Hall Plate face against gear tooth paddy, then just produce a difference magnetic field signal, as gear becomes from the operating of tooth top, tooth paddy It changes, the polarity of this difference magnetic field signal can also be changed with identical speed, and corresponding changes of magnetic field amount passes through at internal signal Reason circuit is converted into voltage signal and goes to trigger and control output-stage circuit, keeps it (defeated in conducting (output low level) and cut-off High level out) it is converted between state.Maximum difference magnetic field signal is to occur in the edge of tooth, when difference magnetic field signal When more than BRP, the efferent duct of chip turns off (cut-off, VOUT is high level), this is the tooth of gear close to second Hall Plate senses later situation.As difference magnetic field signal is lower than BOP, the efferent duct of chip, which will be opened, (to be connected, VOUT is low Level), this is the tooth of gear by sensing later situation close to first Hall Plate.It should be pointed out that not having in static state There is magnetic field knots modification, so output signal is uncertain.

The utility model is using pair difference of Hall Plate differential configuration induced magnetic field variable quantities, to replace single sensor sensing The absolute change amount in magnetic field, this design scheme make temperature drift, the fluctuation of manufacture craft, bias magnetic field discreteness etc. pair The influence of performance parameters is reduced to a minimum；The faint variable quantity in magnetic field is greatly detected simultaneously, to improve biography The corresponding detecting distance by induction gear of sensor, the application range to extend one's service obtain the waveform diagram such as Fig. 3.

The utility model has the symmetry and consistency of good magnetic field switching point, so for uniformly repeating distribution Target toothing can guarantee to export an accurate duty ratio in entire effectively detecting distance range and temperature range, right In uneven duplicate target toothing, pulse width can be matched with the width of target teeth automatically.

Combine figure embodiment that the utility model is described in detail above, those skilled in the art can root Many variations example is made to the utility model according to above description.Within the spirit and principle of the utility model, made What modification, equivalent replacement, improvement etc., should be included within the scope of protection of this utility model.Thus, it is certain in embodiment Details should not constitute the restriction to the utility model, and the utility model will be using the range that the appended claims define as this reality With novel protection scope.

Claims (2)

1. a kind of Hall circuit of adaptive differential input, which is characterized in that the Hall circuit packet of the adaptive differential input Include sequentially connected double Hall circuits, amplifying circuit, comparison circuit, A/D conversion circuit and output circuit, the adaptive differential The Hall circuit of input further includes the first Hall sensor, the second Hall sensor and power circuit, first hall sensing Device and second Hall sensor are connect with double Hall circuits, and the power circuit is separately connected double Hall electricity Road, the amplifying circuit, the comparison circuit, the A/D conversion circuit and the output circuit, double Hall circuits are used for External magnetic field variation, which is incuded, by first Hall sensor and second Hall sensor generates first voltage signal With second voltage signal, the amplifying circuit is for putting the difference of the first voltage signal and the second voltage signal Amplified differential signal is obtained greatly, and the amplified differential signal is compared the adaptive ratio of generation by the comparison circuit Compared with signal, the A/D conversion circuit is used to convert digital comparison signal, the power circuit for the adaptive comparison signal Double Hall circuits, amplifying circuit, comparison circuit, A/D conversion circuit and output circuit are provided, mains power is provided.

2. the Hall circuit of adaptive differential according to claim 1 input, which is characterized in that the power circuit includes Sequentially connected internal electric source, biasing circuit and oscillating circuit, the internal electric source are the Hall of adaptive differential input Circuit generates the DC voltage of 5V, and the biasing circuit is for providing DC offset voltage, and the oscillating circuit is for providing vibration Frequency is swung to generate clock signal.