CN101340186A - Magnet induction switching circuit and control method - Google Patents
Magnet induction switching circuit and control method Download PDFInfo
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- CN101340186A CN101340186A CNA200710123549XA CN200710123549A CN101340186A CN 101340186 A CN101340186 A CN 101340186A CN A200710123549X A CNA200710123549X A CN A200710123549XA CN 200710123549 A CN200710123549 A CN 200710123549A CN 101340186 A CN101340186 A CN 101340186A
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Abstract
The invention relates to a magnetic induction switching circuit and a control method thereof. The magnetic induction switching circuit comprises a magnetic south pole detection unit, a magnetic north pole detection unit and a detection and control unit; the magnetic south pole detection unit detects and judges magnetic field intensity of a magnetic south pole, the magnetic north pole detection unit detects and judges the magnetic field intensity of a magnetic north pole, the detection and control unit judges magnetic field polarity according to trigger signals of the magnetic south pole and the magnetic north pole detection units and selects the trigger signal which is corresponding to a magnetic field polarity detection unit as a switching signal of the magnetic induction switching circuit. The control method of the magnetic induction switching circuit comprises the steps as follows: a first trigger signal is generated by judging the magnetic field intensity of the magnetic south pole; a second trigger signal is generated by judging the magnetic field intensity of the magnetic north pole; the magnetic field polarity is judged according to the first and the second trigger signals within the set detection establishing time; the corresponding trigger signal is selected as the switching signal of the magnetic induction switching circuit according to the magnetic field polarity. The magnetic induction switching circuit and the control method can induce the magnetic field intensities of the magnetic south pole and the north pole, when in placement, the placement direction does not need to be paid attention, and the induction is carried out by selecting a magnetic field with one kind of polarity, thereby preventing misoperation caused by noise.
Description
Technical field
The present invention relates to a kind of magnet induction switching circuit and control method, particularly relate to a kind of magnetic field that can be applicable to two kinds of polarity simultaneously, but but not only induced magnetism antarctic magnetism field intensity but also induced magnetism arctic magnetic field intensity, when putting, need not note placing direction, and selected a kind of magnetic field intensity is responded to when using, and can prevent to cause because of noise the magnet induction switching circuit and the control method thereof of misoperation.
Background technology
In recent years, the magnet induction switching circuit based on magnetic inductor had been widely used in aspects such as location sensing or rotation sensing.For instance, in the loam cake (or lower cover) of clamshell phone, just be provided with magnet induction switching circuit with the distance of detecting between the upper and lower covers, and with the result that the sensed foundation as power supply control.
Seeing also shown in Figure 1ly, is a kind of schematic diagram of magnet induction switching circuit of previous prior art.This magnet induction switching circuit 10 comprises a magnetic induction part 100, an amplifier 110, a comparator 120 and a control unit 130.The operation of this kind magnet induction switching circuit 10 at first is to determine the potential difference that its two ends are exported with this magnetic induction part 100 according to the magnetic flux that passes through.And the potential difference of being exported by the two ends of this magnetic induction part 100 is through after the amplification of this amplifier 110, further judge that via this comparator 120 whether potential difference after amplifying is greater than a certain preset value, and the result that will judge gained sends this detecting and control unit 130 to as switching signal, with the switching of control switch.
Seeing also shown in Fig. 2 (a), Fig. 2 (b), is respectively the output voltage of magnet induction switching circuit of prior art and graph of a relation and the output voltage of magnet induction switching circuit and the graph of a relation of magnetic north pole magnetic field intensity of south magnetic pole magnetic field intensity.Yet, above-mentioned this kind magnet induction switching circuit is at the beginning of design, just only can produce reaction at the changes of magnetic field of a certain fixed polarity, its output is fixed as concern a kind of with the relation of magnetic field intensity shown in Fig. 2 (a) or Fig. 2 (b), so for system design manufacturer, when utilization, just must select the magnetic field of particular polarity, otherwise the system after having assembled can't operate normally.
In order to address the above problem, industry proposes a kind of new magnet induction switching circuit, sees also shown in Figure 3ly, is the schematic diagram of the magnet induction switching circuit of another kind of prior art.This magnet induction switching circuit 20 comprises a magnetic induction part 200, an amplifier 210, one first comparator 220, one second comparator 230 and a control unit 240.The operation of this magnet induction switching circuit 20 at first is to determine the potential difference that its two ends are exported with this magnetic induction part 200 according to the magnetic flux that passes through, the positive and negative polarity of this potential difference corresponding to magnetic field, and this current potential extent is corresponding to the size of magnetic field intensity.And the potential difference of being exported by the two ends of this magnetic induction part 100 is through after the amplification of this amplifier 110, further judge and judge through this second comparator 230 via this first comparator 220, to export to this control unit 240 according to the result who judges gained then, switch signal, the switching that comes control switch to produce one.
Seeing also shown in Figure 4ly, is the output voltage of magnet induction switching circuit 20 of prior art shown in Figure 3 and the graph of a relation of magnetic field intensity.This magnet induction switching circuit 20 is owing to have two comparators, can react according to the variation of the magnetic field intensity of two kinds of opposed polarities, so when product placement, nothing notes the direction that the magnetic thing is put.
Yet, after the magnetic thing is put, the pole orientation that this magnet induction switching circuit is sensed is determined, ought to not have the induction and the output of opposite polarity, this moment is if there is the appearance of the noise of opposite polarity, this magnet induction switching circuit may be operated according to the noise of this opposite polarity, thereby has caused having the generation of misoperation phenomenon.
This shows that above-mentioned existing magnet induction switching circuit and control method obviously still have inconvenience and defective, and demand urgently further being improved in product structure, control method and use.In order to solve the problem of above-mentioned existence, relevant manufacturer there's no one who doesn't or isn't seeks solution painstakingly, but do not see always that for a long time suitable design finished by development, and common product and method do not have appropriate structure and method to address the above problem, and this obviously is the problem that the anxious desire of relevant dealer solves.Therefore how to found a kind of new magnet induction switching circuit and control method, real one of the current important research and development problem that belongs to, also becoming the current industry utmost point needs improved target.
Because the defective that above-mentioned existing magnet induction switching circuit and control method exist, the inventor is based on being engaged in this type of product design manufacturing abundant for many years practical experience and professional knowledge, and the utilization of cooperation scientific principle, actively studied innovation, in the hope of founding a kind of new magnet induction switching circuit and control method, can improve existing magnet induction switching circuit and control method, make it have more practicality.Through constantly research, design, and after studying sample and improvement repeatedly, create the present invention who has practical value finally.
Summary of the invention
The objective of the invention is to, overcome the defective that existing magnet induction switching circuit exists, and provide a kind of magnet induction switching circuit of new structure, technical problem to be solved is to make it can be any suitable in the magnetic field environment of opposed polarity, and only required magnetic direction is produced reaction, be very suitable for practicality.
Another object of the present invention is to, overcome the defective of the control method existence of existing magnet induction switching circuit, and provide a kind of control method of new magnet induction switching circuit, technical problem to be solved is to make it can freely select the aitiogenic magnetic direction of institute's desire, the change of convenient environment and the design of hardware, thus be suitable for practicality more.
An also purpose of the present invention is that a kind of control method of magnet induction switching circuit more is provided, and technical problem to be solved is to make it can prevent from owing to the interference of noise the misoperation phenomenon to take place, thereby is suitable for practicality more.
The object of the invention to solve the technical problems realizes by the following technical solutions.A kind of magnet induction switching circuit according to the present invention's proposition, it is by a detecting and a control unit, with the magnetic field after this magnet induction switching circuit starts, and only the changes of magnetic field of this direction is made a response in the running after this time starts according to a selected direction in detecting settling time of setting.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Aforesaid magnet induction switching circuit, it comprises: a south magnetic pole detecting unit is used to detect and judge the magnetic field intensity of south magnetic pole, to produce one first triggering signal; One magnetic north pole detecting unit is used to detect and judge the magnetic field intensity of magnetic north pole, to produce one second triggering signal; And should detect and control unit, it is coupled to this south magnetic pole detecting unit and this magnetic north pole detecting unit, in the detecting settling time set after this magnet induction switching circuit starts, judge the switching signal of the triggering signal of the polarity in magnetic field and selected corresponding polarity of the magnetic field as this magnet induction switching circuit according to this first triggering signal and second triggering signal.
Aforesaid magnet induction switching circuit, it further comprises: one first switch element, be coupled between this south magnetic pole detecting unit and this detecting and the control unit, be used for this detecting and control unit the triggering signal of this south magnetic pole detecting unit is selected; And a second switch unit, be coupled between this magnetic north pole detecting unit and this detecting and the control unit, be used for this detecting and control unit the triggering signal of magnetic north pole detecting unit output is selected.
Aforesaid magnet induction switching circuit, it comprises: a magnetic induction part is used for the intensity of induced field and produces an induced voltage; One south magnetic pole detecting unit is used for the magnetic field intensity according to this induced voltage judgement south magnetic pole, to produce one first triggering signal; One magnetic north pole detecting unit is used for the magnetic field intensity according to this induced voltage judgement magnetic north pole, to produce one second triggering signal; And should detect and control unit, be coupled to this south magnetic pole detecting unit and this magnetic north pole detecting unit, in the detecting settling time set after this magnet induction switching circuit starts, judge the switching signal of the triggering signal of the polarity in magnetic field and selected corresponding polarity of the magnetic field as this magnet induction switching circuit according to this first triggering signal and second triggering signal.
Aforesaid magnet induction switching circuit, it comprises: a magnetic induction part is used for the intensity of induced field and produces an induced voltage; One first comparator is coupled to this magnetic induction part, is used for judging according to this induced voltage the magnetic field intensity of south magnetic pole, to produce this first triggering signal; One second comparator is coupled to this magnetic induction part, is used for judging according to this induced voltage the magnetic field intensity of magnetic north pole, to produce this second triggering signal; And should detect and control unit, be coupled to this first comparator and second comparator, in the detecting settling time set after this magnet induction switching circuit starts, judge the switching signal of the triggering signal of the polarity in magnetic field and selected corresponding polarity of the magnetic field as this magnet induction switching circuit according to this first triggering signal and second triggering signal.
Aforesaid magnet induction switching circuit, it further comprises: one first switch element, be coupled between this first comparator and this detecting and the control unit, be used for this detecting and control unit the triggering signal of this first comparator is selected; And a second switch unit, be coupled between this second comparator and this detecting and the control unit, be used for this detecting and control unit the triggering signal of this second comparator output is selected.
The object of the invention to solve the technical problems also realizes by the following technical solutions.The control method of a kind of magnet induction switching circuit that proposes according to the present invention, it may further comprise the steps: the magnetic field intensity of judging south magnetic pole also produces one first triggering signal; Judge the magnetic field intensity of magnetic north pole and produce one second triggering signal; In detecting settling time that one sets, judge the polarity in magnetic field according to this first triggering signal and second triggering signal; And according to the switching signal of the selected corresponding triggering signal of the polarity in magnetic field as this magnet induction switching circuit.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
The control method of aforesaid magnet induction switching circuit, the step of this first triggering signal of wherein said generation comprises: the magnetic field intensity in the induced magnetism South Pole also produces an induced voltage; This induced voltage is amplified; And judge the magnetic field intensity of south magnetic pole, and produce this first triggering signal according to the voltage after amplifying.
The control method of aforesaid magnet induction switching circuit, the step of this second triggering signal of wherein said generation comprises: the magnetic field intensity of the induced magnetism arctic also produces an induced voltage; This induced voltage is amplified; And judge the magnetic field intensity of magnetic north pole, and produce this second triggering signal according to the voltage after amplifying.
The object of the invention to solve the technical problems also realizes in addition by the following technical solutions.The control method of a kind of magnet induction switching circuit that proposes according to the present invention, it may further comprise the steps: the intensity of induced field also produces an induced voltage; This induced voltage is amplified; Judge the magnetic field intensity of south magnetic pole according to the voltage after amplifying, and produce one first triggering signal; Judge the magnetic field intensity of magnetic north pole according to the voltage after amplifying, and produce one second triggering signal; Polarity according to this first triggering signal and second triggering signal judgement magnetic field; And according to the switching signal of the selected corresponding triggering signal of the polarity in magnetic field as this magnet induction switching circuit.
The present invention compared with prior art has tangible advantage and beneficial effect.By above technical scheme as can be known, major technique of the present invention thes contents are as follows:
In order to reach aforementioned purpose, one aspect of the present invention proposes a kind of magnet induction switching circuit, it, and is only made a response to the changes of magnetic field of this direction in the running after this time starts with the magnetic field according to a selected direction in detecting settling time of setting after this magnet induction switching circuit starts by a detecting and control unit.
In one embodiment of the invention, aforesaid magnet induction switching circuit comprises: a south magnetic pole detecting unit is used to detect and judge the magnetic field intensity of south magnetic pole, to produce one first triggering signal; One magnetic north pole detecting unit is used to detect and judge the magnetic field intensity of magnetic north pole, to produce one second triggering signal; And aforesaid detecting and control unit, be coupled to this south magnetic pole detecting unit and this magnetic north pole detecting unit, in the detecting settling time set after this magnet induction switching circuit starts, judge the switching signal of the triggering signal of the polarity in magnetic field and selected corresponding polarity of the magnetic field as this magnet induction switching circuit according to this first triggering signal and second triggering signal.
In another embodiment of the present invention, aforesaid magnet induction switching circuit comprises: a kind of magnet induction switching circuit, and it comprises: a magnetic induction part is used for the intensity of induced field and produces an induced voltage; One south magnetic pole detecting unit is used for the magnetic field intensity according to this induced voltage judgement south magnetic pole, to produce one first triggering signal; One magnetic north pole detecting unit is used for the magnetic field intensity according to this induced voltage judgement magnetic north pole, to produce one second triggering signal; And aforesaid detecting and control unit, be coupled to this south magnetic pole detecting unit and this magnetic north pole detecting unit, in the detecting settling time set after this magnet induction switching circuit starts, judge the switching signal of the triggering signal of the polarity in magnetic field and selected corresponding polarity of the magnetic field as this magnet induction switching circuit according to this first triggering signal and second triggering signal.
In another embodiment of the present invention, aforesaid magnet induction switching circuit comprises: a magnetic induction part is used for the intensity of induced field and produces an induced voltage; One first comparator is coupled to this magnetic induction part, is used for judging according to this induced voltage the magnetic field intensity of south magnetic pole, to produce this first triggering signal; One second comparator is coupled to this magnetic induction part, is used for judging according to this induced voltage the magnetic field intensity of magnetic north pole, to produce this second triggering signal; And should detect and control unit, be coupled to this first comparator and second comparator, in the detecting settling time set after this magnet induction switching circuit starts, judge the switching signal of the triggering signal of the polarity in magnetic field and selected corresponding polarity of the magnetic field as this magnet induction switching circuit according to this first triggering signal and second triggering signal.
In addition, in order to achieve the above object, another aspect of the invention proposes a kind of control method of magnet induction switching circuit, and it may further comprise the steps: judge the magnetic field intensity of south magnetic pole and produce one first triggering signal; Judge the magnetic field intensity of magnetic north pole and produce one second triggering signal; In detecting settling time that one sets, judge the polarity in magnetic field according to this first triggering signal and second triggering signal; And according to the switching signal of the selected corresponding triggering signal of the polarity in magnetic field as this magnet induction switching circuit.
In addition, in order to achieve the above object, the present invention also proposes the control method of another kind of magnet induction switching circuit, and it may further comprise the steps: the intensity of induced field also produces an induced voltage; This induced voltage is amplified; Judge the magnetic field intensity of south magnetic pole according to the voltage after amplifying, and produce one first triggering signal; Judge the magnetic field intensity of magnetic north pole according to the voltage after amplifying, and produce one second triggering signal; Polarity according to this first triggering signal and second triggering signal judgement magnetic field; And according to the switching signal of the selected corresponding triggering signal of the polarity in magnetic field as this magnet induction switching circuit.
By technique scheme, magnet induction switching circuit of the present invention and control method have following advantage and beneficial effect at least: compare with previous prior art, above-mentioned magnet induction switching circuit of the present invention and control method thereof, its not only can the induced magnetism South Pole magnetic field intensity but also magnetic field intensity that can the induced magnetism arctic, when putting, need not note the direction of putting; And the magnetic field intensity of selected a kind of magnetic is responded to when using, and can effectively prevent from the misoperation that causes because of noise to be very suitable for practicality.
In sum, the present invention is relevant a kind of magnet induction switching circuit and control method.This magnet induction switching circuit, comprise a south magnetic pole detecting unit, a magnetic north pole detecting unit and a detecting and a control unit, this south magnetic pole detecting unit is used to detect and judge the magnetic field intensity of south magnetic pole, this magnetic north pole detecting unit is used to detect and judge the magnetic field intensity of magnetic north pole, and the triggering signal of detecting unit that this detecting is judged the polarity in magnetic field with control unit according to the triggering signal of this south magnetic pole detecting unit and this magnetic north pole detecting unit and selected corresponding polarity of the magnetic field is as the switching signal of this magnet induction switching circuit.The present invention also provides a kind of control method of this magnet induction switching circuit.Magnet induction switching circuit of the present invention can be any suitable in the magnetic field environment of opposed polarity, and only required magnetic direction is produced reaction, is very suitable for practicality.The control method of magnet induction switching circuit of the present invention can freely be selected institute's desire aitiogenic magnetic direction, the change of convenient environment and the design of hardware.The control method of magnet induction switching circuit of the present invention can prevent from owing to the interference of noise the misoperation phenomenon to take place.The present invention has above-mentioned plurality of advantages and practical value, no matter it all has bigger improvement on product structure, control method or function, marked improvement is arranged technically, and more existing magnet induction switching circuit and control method have the outstanding effect of enhancement, and have the extensive value of industry, really be a new and innovative, progressive, practical new design.
Above-mentioned explanation only is the general introduction of technical solution of the present invention, for can clearer understanding technological means of the present invention, and can be implemented according to the content of specification, and for above-mentioned and other purposes, feature and advantage of the present invention can be become apparent, below especially exemplified by preferred embodiment, and conjunction with figs., be described in detail as follows.
Description of drawings
Fig. 1 is a kind of schematic diagram of magnet induction switching circuit of prior art.
Fig. 2 (a) is the output voltage of magnet induction switching circuit of prior art and the graph of a relation of south magnetic pole magnetic field intensity.
Fig. 2 (b) is the output voltage of magnet induction switching circuit of prior art and the graph of a relation of magnetic north pole magnetic field intensity.
Fig. 3 is the schematic diagram of the magnet induction switching circuit of another kind of prior art.
Fig. 4 is the output voltage of magnet induction switching circuit of prior art shown in Figure 3 and the graph of a relation of magnetic field intensity.
Fig. 5 is the schematic diagram of the magnet induction switching circuit of first embodiment of the invention.
Fig. 6 is the schematic diagram of the magnet induction switching circuit of second embodiment of the invention.
Fig. 7 is the schematic diagram of the magnet induction switching circuit of third embodiment of the invention.
30,40,50: magnet induction switching circuit 300,411,421,500: magnetic induction part
310,412,422: 320: the first comparators of amplifier
Comparator 340,350,430,440 in 330: the second: switch element
360,450,550: detecting and 410: the first magnetic pole detecting units of control unit
413,423: comparator 430,520: magnetic north pole detecting unit
512,612: amplifier 513,523: comparator
420: the second magnetic pole detecting units (south magnetic pole detecting unit)
510: the first magnetic pole detecting units (south magnetic pole detecting unit)
520: the second magnetic pole detecting units (magnetic north pole detecting unit)
Embodiment
Reach technological means and the effect that predetermined goal of the invention is taked for further setting forth the present invention, below in conjunction with accompanying drawing and preferred embodiment, to magnet induction switching circuit and its embodiment of control method, structure, method step, feature and the effect that foundation the present invention proposes, describe in detail as after.
Relevant aforementioned and other technology contents, characteristics and effect of the present invention can clearly present in the following detailed description that cooperates with reference to graphic preferred embodiment.For convenience of description, in following embodiment, components identical is represented with identical numbering.
Seeing also shown in Figure 5ly, is the structural representation of the magnet induction switching circuit of first embodiment of the invention.This magnet induction switching circuit 30 comprises magnetic induction part 300, amplifier 310, first comparator 320, second comparator 330, switch element 340,350 and detecting and control unit 360.
This magnetic induction part 300, it determines the potential difference that export at its two ends according to the magnetic flux that passes through, the positive and negative polarity of this potential difference corresponding to magnetic field, this current potential extent is corresponding to the size of magnetic field intensity.
This amplifier 310, its two input is connected with two outputs of this magnetic induction part 300, amplifies with the voltage difference to its two ends.The output of amplifier 310 is connected with an input of this first comparator 320, an input of second comparator 330 respectively.
This first comparator 320 and second comparator 330, be used for the voltage swing after this amplification is judged, size with the magnetic field intensity of judging sensed magnetic thing, first comparator 320 is used to judge the size of the magnetic field intensity of south magnetic pole, and second comparator 330 is used to judge the size of the magnetic field intensity of magnetic north pole.
This switch element 340, it is arranged between this first comparator 320 and detecting and the control unit 360;
This switch element 350 is arranged between second comparator 330 and detecting and the control unit 360.
This detecting and control unit 360, controllable switch unit 340 and 350 state are to select to adopt the output signal of first comparator 320 or second comparator 330.In addition, this detecting and control unit 360 also can control first comparator 320 and whether second comparator 330 is operated, to block the generation of corresponding output signal by this.
It should be noted that switch element 340 and switch element 350 are not the necessary element in the present embodiment.The those skilled in the art that have the knack of this technology be when knowing, whether when being controlled first comparator 320 by detecting and control unit 360 and operate with second comparator 330, switch element 340 and switch element 350 just can be omitted need not.
Be provided with one in this detecting and the control unit 360 and detect settling time (Detect and SetupTime), when power supply is reset, this magnet induction switching circuit 30 starts, in this detected settling time, detecting can be judged the polarity in magnetic field according to the output signal of first comparator 320 and second comparator 330 with control unit 360.If the polarity in magnetic field is south magnetic pole, then turn off the switch element 350 that is connected with second comparator 330 before the end settling time in this detecting, and the output signal of selecting first comparator 320 is as switching signal, so, the output signal of this magnet induction switching circuit 30 is just only relevant with the magnetic field intensity of south magnetic pole, and the signal of its output and the relation of magnetic field intensity are shown in Fig. 2 (a); If the polarity in magnetic field is magnetic north pole, then before this detecting finishes settling time, turn off the switch element 340 that is connected with first comparator 320, and the output signal of selecting second comparator 330 is as switching signal.So, the output signal of this magnet induction switching circuit 30 is just only relevant with the magnetic field intensity of magnetic north pole, and the signal of its output and the relation of magnetic field intensity are shown in Fig. 2 (b).
Compare with previous prior art, this magnet induction switching circuit 30 comprises that two comparators are respectively applied for the magnetic field intensity of judging south magnetic pole and magnetic north pole, so need not note the direction of putting when putting; And detecting and control unit 360 are judged polarity of the magnetic field in settling time in detecting, and the selected comparator of judging magnetic field intensity, thereby can effectively prevent the misoperation that causes because of noise.
Seeing also shown in Figure 6ly, is the structural representation of the magnet induction switching circuit of second execution mode of the present invention.In the present embodiment, this magnet induction switching circuit 40 comprises the first magnetic pole detecting unit 410, the second magnetic pole detecting unit 420 and detecting and control unit 450.
This first magnetic pole detecting unit 410 is used to detect the magnetic field intensity of south magnetic pole, and it comprises magnetic induction part 411, amplifier 412, comparator 413 and switch element 430, and it is connected with control unit 450 with detecting by switch element 430.
This second magnetic pole detecting unit 420 is used to detect the magnetic field intensity of magnetic north pole, and it comprises magnetic induction part 421, amplifier 422, comparator 423 and switch element 440, and it is connected with control unit 450 with detecting by switch element 440.
Do real, this detecting and control unit 450, the operation that can select to make arbitrary element in the control first magnetic pole detecting unit 410 and the second magnetic pole detecting unit 420 is by this to control the generation of corresponding output signal.For instance, this detecting and control unit 450 can control switch unit 430 and the state of switch element 440, to select to use the output signal of the first magnetic pole detecting unit 410 or the second magnetic pole detecting unit 420.In another example, whether this detecting and control unit 450 then can be controlled magnetic induction part 411 and operate with magnetic induction part 421, by this to control the first magnetic pole detecting unit 410 and whether the second magnetic pole detecting unit 420 produces output signal.
With embodiment shown in Figure 5 similar reason is arranged, the those skilled in the art that have the knack of this technology do not repeat them here when the necessary element of knowing in the yet non-present embodiment of switch element 430 and 440.
Be provided with one in this detecting and the control unit 450 and detect settling time, when power supply is reset, magnet induction switching circuit 40 starts, in this detected settling time, this detecting and control unit 450 can be judged the polarity in magnetic field according to the output signal of the first magnetic pole detecting unit 410 and the second magnetic pole detecting unit 420.If the polarity in magnetic field is south magnetic pole, then turn off the switch element 440 that is connected with the second magnetic pole detecting unit 420 before the end settling time in this detecting, and the output signal of selecting the first magnetic pole detecting unit 410 is as switching signal, so, the output signal of this magnet induction switching circuit 40 is just only relevant with the magnetic field intensity of south magnetic pole, and the signal of its output and the relation of magnetic field intensity are shown in Fig. 2 (a); If the polarity in magnetic field is magnetic north pole, then turn off the switch element 430 that is connected with the first magnetic pole detecting unit 410 before the end settling time in this detecting, and the output signal of selecting the second magnetic pole detecting unit 420 is as switching signal, so, the output signal of this magnet induction switching circuit 40 is just only relevant with the magnetic field intensity of magnetic north pole, and the signal of its output and the relation of magnetic field intensity are shown in Fig. 2 (b).
Compare with previous prior art, the detecting of this magnet induction switching circuit 40 and control unit 450 comprise that two magnetic pole detecting units are respectively applied for the magnetic field intensity of detecting south magnetic pole and magnetic north pole, so need not note the direction of putting when putting; And detecting and control unit are judged polarity of the magnetic field driving in settling time, and the selected magnetic pole detecting unit of judging magnetic field intensity, can effectively prevent the misoperation that causes because of noise.
Seeing also shown in Figure 7ly, is the schematic diagram of the magnet induction switching circuit of the 3rd execution mode of the present invention.In the present embodiment, this magnet induction switching circuit 50 comprises magnetic induction part 500, the first magnetic pole detecting unit 510, the second magnetic pole detecting unit 520 and detecting and control unit 550.
This magnetic induction part 500 is used for the signal of induced field.
This first magnetic pole detecting unit 510 is used to detect the magnetic field intensity of south magnetic pole, and it is connected with control unit 550 with detecting, and it comprises amplifier 512 and comparator 513.
This second magnetic pole detecting unit 520 is used to detect the magnetic field intensity of magnetic north pole, and it is connected with control unit 550 with detecting, and it comprises amplifier 522 and comparator 523.
This detecting and control unit 550 can be controlled the output signal of the first magnetic pole detecting unit 510 and the second magnetic pole detecting unit 520, with the output signal of the selective reception first magnetic pole detecting unit 510 or the second magnetic pole detecting unit 520.May further include switch element in the first magnetic pole detecting unit 510 and the second magnetic pole detecting unit 520, so that this detecting and control unit 550 are controlled its output signal.
Be provided with one in this detecting and the control unit 550 and detect settling time, when power supply is reset, magnet induction switching circuit 50 starts, in this detected settling time, detecting can be judged the polarity in magnetic field according to the output signal of the first magnetic pole detecting unit 510 and the second magnetic pole detecting unit 520 with control unit.If the polarity in magnetic field is south magnetic pole, then stop to receive the output signal of the second magnetic pole detecting unit 520 settling time before the end in this detecting, and the output signal of selecting the first magnetic pole detecting unit 510 is as switching signal, so, the output signal of this magnet induction switching circuit 50 is just only relevant with the magnetic field intensity of south magnetic pole, and the signal of its output and the relation of magnetic field intensity are shown in Fig. 2 (a); If the polarity in magnetic field is magnetic north pole, then stop to receive the output signal of the first magnetic pole detecting unit 510 settling time before the end in this detecting, and the output signal of selecting the second magnetic pole detecting unit 520 is as switching signal, so, the output signal of this magnet induction switching circuit 50 is just only relevant with the magnetic field intensity of magnetic north pole, and the signal of its output and the relation of magnetic field intensity are shown in Fig. 2 (b).
Compare with previous prior art, the detecting of this magnet induction switching circuit 50 and control unit 550 comprise that two magnetic pole detecting units are respectively applied for the magnetic field intensity of detecting south magnetic pole and magnetic north pole, so need not note the direction of putting when putting; And detecting and control unit are judged polarity of the magnetic field driving in settling time, and the selected magnetic pole detecting unit of judging magnetic field intensity, and can effectively prevent the misoperation that causes because of noise.
The above, it only is preferred embodiment of the present invention, be not that the present invention is done any pro forma restriction, though the present invention discloses as above with preferred embodiment, yet be not in order to limit the present invention, any those skilled in the art, in not breaking away from the technical solution of the present invention scope, when the method that can utilize above-mentioned announcement and technology contents are made a little change or be modified to the equivalent embodiment of equivalent variations, in every case be the content that does not break away from technical solution of the present invention, according to technical spirit of the present invention to any simple modification that above embodiment did, equivalent variations and modification all still belong in the scope of technical solution of the present invention.
Claims (10)
1, a kind of magnet induction switching circuit, it is characterized in that it is by a detecting and a control unit, with the magnetic field after this magnet induction switching circuit starts, and only the changes of magnetic field of this direction is made a response in the running after this time starts according to a selected direction in detecting settling time of setting.
2, magnet induction switching circuit according to claim 1 is characterized in that it comprises:
One south magnetic pole detecting unit is used to detect and judge the magnetic field intensity of south magnetic pole, to produce one first triggering signal;
One magnetic north pole detecting unit is used to detect and judge the magnetic field intensity of magnetic north pole, to produce one second triggering signal; And
This detecting and control unit, it is coupled to this south magnetic pole detecting unit and this magnetic north pole detecting unit, in the detecting settling time set after this magnet induction switching circuit starts, judge the switching signal of the triggering signal of the polarity in magnetic field and selected corresponding polarity of the magnetic field as this magnet induction switching circuit according to this first triggering signal and second triggering signal.
3, magnet induction switching circuit according to claim 2 is characterized in that it further comprises:
One first switch element is coupled between this south magnetic pole detecting unit and this detecting and the control unit, is used for this detecting and control unit the triggering signal of this south magnetic pole detecting unit is selected; And
One second switch unit is coupled between this magnetic north pole detecting unit and this detecting and the control unit, is used for this detecting and control unit the triggering signal of magnetic north pole detecting unit output is selected.
4, magnet induction switching circuit according to claim 1 is characterized in that it comprises:
One magnetic induction part is used for the intensity of induced field and produces an induced voltage;
One south magnetic pole detecting unit is used for the magnetic field intensity according to this induced voltage judgement south magnetic pole, to produce one first triggering signal;
One magnetic north pole detecting unit is used for the magnetic field intensity according to this induced voltage judgement magnetic north pole, to produce one second triggering signal; And
This detecting and control unit, be coupled to this south magnetic pole detecting unit and this magnetic north pole detecting unit, in the detecting settling time set after this magnet induction switching circuit starts, judge the switching signal of the triggering signal of the polarity in magnetic field and selected corresponding polarity of the magnetic field as this magnet induction switching circuit according to this first triggering signal and second triggering signal.
5, magnet induction switching circuit according to claim 1 is characterized in that it comprises:
One magnetic induction part is used for the intensity of induced field and produces an induced voltage;
One first comparator is coupled to this magnetic induction part, is used for judging according to this induced voltage the magnetic field intensity of south magnetic pole, to produce this first triggering signal;
One second comparator is coupled to this magnetic induction part, is used for judging according to this induced voltage the magnetic field intensity of magnetic north pole, to produce this second triggering signal; And
This detecting and control unit, be coupled to this first comparator and second comparator, in the detecting settling time set after this magnet induction switching circuit starts, judge the switching signal of the triggering signal of the polarity in magnetic field and selected corresponding polarity of the magnetic field as this magnet induction switching circuit according to this first triggering signal and second triggering signal.
6, magnet induction switching circuit according to claim 5 is characterized in that it further comprises:
One first switch element is coupled between this first comparator and this detecting and the control unit, is used for this detecting and control unit the triggering signal of this first comparator is selected; And
One second switch unit is coupled between this second comparator and this detecting and the control unit, is used for this detecting and control unit the triggering signal of this second comparator output is selected.
7, a kind of control method of magnet induction switching circuit is characterized in that it may further comprise the steps:
Judge the magnetic field intensity of south magnetic pole and produce one first triggering signal;
Judge the magnetic field intensity of magnetic north pole and produce one second triggering signal;
In detecting settling time that one sets, judge the polarity in magnetic field according to this first triggering signal and second triggering signal; And
Select the switching signal of corresponding triggering signal according to the polarity in magnetic field as this magnet induction switching circuit.
8, the control method of magnet induction switching circuit according to claim 7 is characterized in that the step of this first triggering signal of wherein said generation comprises:
The magnetic field intensity in the induced magnetism South Pole also produces an induced voltage;
This induced voltage is amplified; And
Judge the magnetic field intensity of south magnetic pole according to the voltage after amplifying, and produce this first triggering signal.
9, the control method of magnet induction switching circuit according to claim 7 is characterized in that the step of this second triggering signal of wherein said generation comprises:
The magnetic field intensity of the induced magnetism arctic also produces an induced voltage;
This induced voltage is amplified; And
Judge the magnetic field intensity of magnetic north pole according to the voltage after amplifying, and produce this second triggering signal.
10, a kind of control method of magnet induction switching circuit is characterized in that it may further comprise the steps:
The intensity of induced field also produces an induced voltage;
This induced voltage is amplified;
Judge the magnetic field intensity of south magnetic pole according to the voltage after amplifying, and produce one first triggering signal;
Judge the magnetic field intensity of magnetic north pole according to the voltage after amplifying, and produce one second triggering signal;
Polarity according to this first triggering signal and second triggering signal judgement magnetic field; And
Select the switching signal of corresponding triggering signal according to the polarity in magnetic field as this magnet induction switching circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200710123549XA CN101340186A (en) | 2007-07-02 | 2007-07-02 | Magnet induction switching circuit and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA200710123549XA CN101340186A (en) | 2007-07-02 | 2007-07-02 | Magnet induction switching circuit and control method |
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| Publication Number | Publication Date |
|---|---|
| CN101340186A true CN101340186A (en) | 2009-01-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA200710123549XA Pending CN101340186A (en) | 2007-07-02 | 2007-07-02 | Magnet induction switching circuit and control method |
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| CN (1) | CN101340186A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106879112A (en) * | 2017-03-06 | 2017-06-20 | 深圳市茂捷半导体有限公司 | A kind of proximity magnetic induction switch control chip and its control method |
-
2007
- 2007-07-02 CN CNA200710123549XA patent/CN101340186A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106879112A (en) * | 2017-03-06 | 2017-06-20 | 深圳市茂捷半导体有限公司 | A kind of proximity magnetic induction switch control chip and its control method |
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