CN102565746A - Detection device for Hall device sensor - Google Patents
Detection device for Hall device sensor Download PDFInfo
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- CN102565746A CN102565746A CN2012100630308A CN201210063030A CN102565746A CN 102565746 A CN102565746 A CN 102565746A CN 2012100630308 A CN2012100630308 A CN 2012100630308A CN 201210063030 A CN201210063030 A CN 201210063030A CN 102565746 A CN102565746 A CN 102565746A
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Abstract
The invention provides a detection device for a Hall device sensor. The detection device comprises an external trigger device, the Hall device sensor, microprocessor units and a pulse width modulator, wherein the Hall device sensor is electrically connected to the external trigger device; the microprocessor units are connected to two ends of the Hall device sensor in parallel; and the pulse width modulator is electrically connected to the microprocessor units. By adoption of the detection device for the Hall device sensor, the signal effectiveness and accuracy of the Hall device sensor can be effectively determined.
Description
Technical field
The present invention relates to the Hall device sensor detection range, and be particularly related to a kind of Hall device sensor pick-up unit that utilizes pulse-width modulator.
Background technology
Hall element is a kind of magnetic field sensor of making according to Hall effect.Hall effect is a kind of of magnetoelectric effect, and this phenomenon is that Hall was found when studying the conductive mechanism of metal in 1879.Found afterwards that semiconductor, conductive fluid etc. also had this effect, and semi-conductive Hall effect is more much better than than metal, the various Hall elements that utilize this phenomenon to process are widely used in aspects such as industrial automation technology, detection technique and information processing.
Hall element is divided into lienar for Hall element and Hall switch sensor, and wherein Hall switch sensor is by voltage stabilizer, Hall element, differential amplifier, and this schmitt trigger and output stage are formed.When the magnetic induction density that adds surpasses operating point Bop, the sensor output low level, when magnetic induction density drops to operating point Bop when following, the sensor output level is constant, and in the time of will dropping to point of release BRP, sensor is a high level by low level transition just always.
The Hall device sensor output state generally is the high-low level signal; But during owing to sensor failure; Output state signal also is high level or low level, thereby can't judge the correctness of sensor output signal, just can't judge also whether Hall device sensor lost efficacy.
Common this type Hall element adopts two sensors to satisfy the correctness of exporting signal in the prior art, when first sensor output high level, and the second sensor output low level; Otherwise when the sensor normal variation, first sensor output low level, second sensor output high level; When one of them sensor failure; Failure sensor is only exported high level or low level, and signal output does not change, and makes the module of gathering this signal determine this sensor and loses efficacy.Yet this detection method need be used two Hall device sensors, and cost is higher.
Summary of the invention
The present invention proposes a kind of Hall device sensor pick-up unit, can effectively judge the signal validity and the correctness of Hall device sensor.
In order to achieve the above object, the present invention proposes a kind of Hall device sensor pick-up unit, comprising:
External trigger device;
Hall device sensor is electrically connected at said external trigger device;
Microprocessor unit is parallel to said Hall device sensor two ends;
Pulse-width modulator is electrically connected at said microprocessor unit.
Further, said pulse-width modulator output area is at the 10%-95% pulse width modulating signal.
Further, when said Hall device sensor was exported high level signal, said pulse-width modulator was exported 75% pulse width modulating signal.
Further, when said Hall device sensor output low level signal, said pulse-width modulator is exported 25% pulse width modulating signal.
Further, when said Hall device sensor lost efficacy, said pulse-width modulator output high level or low level.
The Hall device sensor pick-up unit that the present invention proposes adopts pulse-width modulator, and through the microprocessor unit control detection, can effectively judge the signal validity and the correctness of Hall device sensor, and cost is lower simultaneously.
Description of drawings
Shown in Figure 1 for the Hall device sensor pick-up unit synoptic diagram of preferred embodiment of the present invention.
Embodiment
In order more to understand technology contents of the present invention, special act specific embodiment also cooperates appended graphic explanation following.
Please refer to Fig. 1, shown in Figure 1 for the Hall device sensor pick-up unit synoptic diagram of preferred embodiment of the present invention.The present invention proposes a kind of Hall device sensor pick-up unit, comprising: external trigger device 100; Hall device sensor 200 is electrically connected at said external trigger device 100; Microprocessor unit 300 is parallel to said Hall device sensor 200 two ends; Pulse-width modulator 400 is electrically connected at said microprocessor unit 300.
Pulse-length modulation (Pulse Width Modulation; PWM); Being called for short width modulation, is to utilize the numeral of microprocessor to export a kind of very effective technology that mimic channel is controlled, and is widely used in from many fields of measurement, the power of communicating by letter control and conversion.
Pulse-length modulation is a kind of analog control mode; Its variation according to respective loads comes the biasing of modulation crystal tube grid or base stage; Realize switching power supply output transistor or the change of transistor turns time; This mode can make the output voltage of power supply when operation conditions change, keep constant, is to utilize the numeral of microprocessor to export a kind of very effective technology that mimic channel is controlled.
Pulse-length modulation (PWM) is a kind of analog signal level to be carried out digitally coded method.Through the use of high resolving power counter, modulated being used for of the dutycycle of square wave encoded to the level of a physical simulation signal.Pwm signal remains numeral, because in given any moment, expires the direct current supply of amplitude or (ON) arranged fully, or do not have (OFF) fully.Voltage or current source are to be added to fictitious load with a kind of repetition pulse sequence of leading to (ON) or disconnected (OFF) to get on.Promptly being direct current supply when being added in the load in the time of logical, promptly is that power supply is when being disconnected in the time of disconnected.The advantage of PWM all is digital form from processor to the controlled system signal, need not to carry out digital-to-analog conversion.Let signal remain digital form and can noise effect be dropped to minimum.Noise only by force when being enough to logical one changed into logical zero or logical zero changed into logical one, also could exert an influence to digital signal.
The preferred embodiment according to the present invention, said pulse-width modulator 400 output areas are at the 10%-95% pulse width modulating signal.When said Hall device sensor 200 is exported high level signals, said pulse-width modulator 400 outputs 75% pulse width modulating signal.When said Hall device sensor 200 output low level signals, said pulse-width modulator 400 outputs 25% pulse width modulating signal.When said Hall device sensor 200 lost efficacy, said pulse-width modulator 400 output high level or low levels, thus make signal acquisition module normally judge the signal validity and the correctness of Hall device sensor.
Though the present invention discloses as above with preferred embodiment, so it is not in order to limit the present invention.Have common knowledge the knowledgeable in the technical field under the present invention, do not breaking away from the spirit and scope of the present invention, when doing various changes and retouching.Therefore, protection scope of the present invention is as the criterion when looking claims person of defining.
Claims (5)
1. a Hall device sensor pick-up unit is characterized in that, comprising:
External trigger device;
Hall device sensor is electrically connected at said external trigger device;
Microprocessor unit is parallel to said Hall device sensor two ends;
Pulse-width modulator is electrically connected at said microprocessor unit.
2. Hall device sensor pick-up unit according to claim 1 is characterized in that, said pulse-width modulator output area is at the 10%-95% pulse width modulating signal.
3. Hall device sensor pick-up unit according to claim 1 is characterized in that, when said Hall device sensor was exported high level signal, said pulse-width modulator was exported 75% pulse width modulating signal.
4. Hall device sensor pick-up unit according to claim 1 is characterized in that, when said Hall device sensor output low level signal, said pulse-width modulator is exported 25% pulse width modulating signal.
5. Hall device sensor pick-up unit according to claim 1 is characterized in that, when said Hall device sensor lost efficacy, and said pulse-width modulator output high level or low level.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100630308A CN102565746A (en) | 2012-03-09 | 2012-03-09 | Detection device for Hall device sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012100630308A CN102565746A (en) | 2012-03-09 | 2012-03-09 | Detection device for Hall device sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102565746A true CN102565746A (en) | 2012-07-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012100630308A Pending CN102565746A (en) | 2012-03-09 | 2012-03-09 | Detection device for Hall device sensor |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106646316A (en) * | 2017-01-24 | 2017-05-10 | 上海麦歌恩微电子股份有限公司 | Method for testing noise of switching-type Hall sensor |
| CN109917317A (en) * | 2019-03-21 | 2019-06-21 | 河北申科电力股份有限公司 | Hall current sensor calibration detection apparatus and method |
-
2012
- 2012-03-09 CN CN2012100630308A patent/CN102565746A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106646316A (en) * | 2017-01-24 | 2017-05-10 | 上海麦歌恩微电子股份有限公司 | Method for testing noise of switching-type Hall sensor |
| CN106646316B (en) * | 2017-01-24 | 2019-06-14 | 上海麦歌恩微电子股份有限公司 | The test method of Hall switch sensor noise |
| CN109917317A (en) * | 2019-03-21 | 2019-06-21 | 河北申科电力股份有限公司 | Hall current sensor calibration detection apparatus and method |
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Application publication date: 20120711 |