CN106443524A - Magnetic sensor integrated circuit, motor assembly and application device - Google Patents
Magnetic sensor integrated circuit, motor assembly and application device Download PDFInfo
- Publication number
- CN106443524A CN106443524A CN201610392144.5A CN201610392144A CN106443524A CN 106443524 A CN106443524 A CN 106443524A CN 201610392144 A CN201610392144 A CN 201610392144A CN 106443524 A CN106443524 A CN 106443524A
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- signal
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- amplifier
- magnetic field
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/02—Measuring direction or magnitude of magnetic fields or magnetic flux
- G01R33/06—Measuring direction or magnitude of magnetic fields or magnetic flux using galvano-magnetic devices
- G01R33/07—Hall effect devices
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R33/00—Arrangements or instruments for measuring magnetic variables
- G01R33/0023—Electronic aspects, e.g. circuits for stimulation, evaluation, control; Treating the measured signals; calibration
- G01R33/0029—Treating the measured signals, e.g. removing offset or noise
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P6/00—Arrangements for controlling synchronous motors or other dynamo-electric motors using electronic commutation dependent on the rotor position; Electronic commutators therefor
- H02P6/14—Electronic commutators
- H02P6/16—Circuit arrangements for detecting position
Abstract
The invention discloses a magnetic sensor integrated circuit, a motor assembly and an application device. The magnetic sensor integrated circuit comprises an input port used for connection with an external power source, an output port and a magnetic field detection circuit. The magnetic field detection circuit comprises a magnetic sensing element used for sensing an external magnetic field and outputting detection electric signals, a signal processing unit used for performing amplification de-noising processing on the detection electric signals and a conversion unit used for converting the detection electric signals processed by the signal processing circuit into magnetic field detection signals, wherein the signal processing unit is provided with an amplifier and a filtering circuit, and the gain of the amplifier is greater than the gain of the filtering circuit.
Description
Technical field
The present invention relates to field of circuit technology, more particularly to Magnetic Sensor integrated circuit.
Background technology
The action principle of Magnetic Sensor is Hall effect, and Hall effect refers to for electric current I to pass to a material, and with electric current
When becoming the direction of positive angle to apply magnetic field B, the phenomenon of potential difference V produced by right angle orientation in electric current I and magnetic field B.?
In practical application, Magnetic Sensor is frequently utilized for detecting the polarity of the magnetic field of rotor.
With continuous improvement of the Magnetic Sensor demand manufacturer to product requirement, at Magnetic Sensor internal circuit configuration and signal
The correlational study of reason process is also constantly deeply.Correspondingly, using the magnetic sensing of Magnetic Sensor detection rotor polarity of the magnetic field
Device process circuit, it is also desirable in terms of meeting Magnetic Sensor demand manufacturer to the testing result accuracy of Magnetic Sensor and reliability
Require.
Content of the invention
On the one hand the embodiment of the present invention provides a kind of Magnetic Sensor integrated circuit, including the input for connecting external power source
Port, magnetic field detection circuit, output port and output control circuit；
The magnetic field detection circuit include for perceive external magnetic field and export detection the signal of telecommunication magnetic induction element, for
The detection signal of telecommunication is amplified disturbing the signal processing unit for processing and for will be through the signal processing list
The detection signal of telecommunication that unit is processed is converted to the converting unit of magnetic field detection signal；
The signal processing unit has amplifier and filter circuit, and the gain of the amplifier is more than the filter circuit
Gain；
The output control circuit is used at least being based on the magnetic field detection signal, makes the Magnetic Sensor integrated circuit extremely
Few from the output port to the outside first state for flowing out electric current and from outside to the output port inflow current the
Run under the one of state of two-state.
Optionally, the detection signal of telecommunication includes field signal and deviation signal, and the amplifier is chopper-type amplifier,
The filter circuit is low-pass filter circuit, and the signal processing unit includes：
Deviation signal and field signal for exporting the magnetic induction element is separated to baseband frequency and chopping frequency
The first chopping switch；
Believe for being amplified to separated deviation signal and field signal and by amplified deviation signal and magnetic field
Number exchange to the chopper-type amplifier of the chopping frequency and the baseband frequency；And
For eliminating the low-pass filter circuit of the deviation signal for exchanging to the chopping frequency.
Optionally, the chopping frequency is less than 200 hertz more than 100K hertz and/or the baseband frequency.
Optionally, the chopper-type amplifier includes the first amplifier being sequentially connected and the second chopping switch；Wherein,
First amplifier includes folded-cascade amplifier, for the deviation letter exported by first chopping switch
Number and field signal carry out first order amplification；
Second chopping switch is used for carrying out deviation signal and the magnetic field of first order amplification through first amplifier
Signal exchange is to the chopping frequency and baseband frequency.
Optionally, the signal processing unit also include to be connected to the chopper-type amplifier and the low pass filter it
Between the second amplifier, second amplifier be used for through exchange deviation signal and field signal carry out the second level and put
Greatly.
Optionally, the gain of first amplifier is more than the gain of second amplifier.
Optionally, first amplifier exports a pair of differential signal, and second chopping switch is configured at each
This is exchanged output to differential signal by the later half cycle of clock cycle.
Optionally, the signal processing unit also includes：
The sampling hold circuit being connected between second chopping switch and the low pass filter, the sampling keeps
Circuit is used for each signal in the differential signal after exchange, distinguishes within former and later two half periods of each clock cycle
Gathered data is simultaneously divided into two-way sampled signal and each exports.
Optionally, the low-pass filter circuit includes the first wave filter, and first wave filter is used for protecting the sampling
Two pairs of sampled signals for holding circuit output carry out addition process respectively, eliminate deviation signal.
Optionally, the low-pass filter circuit also includes the second wave filter, and second wave filter is used for described first
The differential signal of wave filter output is filtered amplifying.
Optionally, the gain of first wave filter is less than the gain of second wave filter.
Optionally, the gain of first amplifier is more than the gain of second wave filter.
Optionally, the output control circuit includes first switch and second switch, the first switch and the output
Port is connected in the first current path, and the second switch is connected to and the first current path side with the output port
To the second contrary current path, the first switch and second switch selectivity under the control of the switching mode detection signal
Ground conducting.
Optionally, the magnetic field detection signal is that switching mode detection signal, the input port is used for connecting external communication
Power supply, the switches switching frequency of the switching mode detection signal is proportional to the frequency of the alternating current power supply or is equal to the exchange
The twice of the frequency of power supply.
Optionally, the output control circuit have from the output pin flow outwardly electric current the first current path,
The second current path of electric current is flowed inward into from the output pin and be connected to first current path and the second electric current
Switch in the one of path of path, the switch is controlled by the magnetic field detection information of the magnetic field detection circuit output, is made
Obtain the first current path and the conducting of the second current path selectivity.
On the other hand the embodiment of the present invention provides a kind of Magnetic Sensor integrated circuit, including for connecting the defeated of external power source
Inbound port, output port and magnetic field detection circuit, the magnetic field detection circuit is included for perceiving external magnetic field and exporting detection
The magnetic induction element of the signal of telecommunication, be used for described detection the signal of telecommunication be amplified disturb process signal processing unit and use
In the converting unit that the detection signal of telecommunication through the signal processing unit processes is converted to magnetic field detection signal；Wherein, institute
State signal processing unit and there is amplifier and filter circuit, the gain of the amplifier is more than the gain of the filter circuit.
Optionally, the signal processing unit has the feature of the signal processing unit described in any of the above-described kind.
Optionally, also include the rectification circuit being connected with the input port, the magnetic field detection circuit is by the rectification
The output voltage of circuit is powered.
Embodiment of the present invention another further aspect provides a kind of electric machine assembly, including motor and motor-drive circuit, the motor
Drive circuit has above-mentioned Magnetic Sensor integrated circuit.
Embodiment of the present invention another further aspect provides a kind of application apparatus with above-mentioned electric machine assembly.
Preferably, the application apparatus is pump, fan, household electrical appliance or vehicle.
Understand via above-mentioned technical scheme, compared with prior art, the embodiment of the invention discloses a kind of Magnetic Sensor
Integrated circuit and Magnetic Sensor, its internal magnetic field detection circuit effectively can carry out gain amplification, disappear to input voltage signal
Except offset voltage and filtering etc. are operated so that the detection signal accuracy of magnetic field detection circuit output greatly promotes high with comparison
Accuracy and reliability.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
Accompanying drawing to be used needed for technology description is had to be briefly described, it should be apparent that, drawings in the following description are only this
Inventive embodiment, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
The accompanying drawing of offer obtains other accompanying drawings.
Fig. 1 is the structural representation of Magnetic Sensor disclosed in the embodiment of the present invention；
Fig. 2 is the structural representation of signal processing unit disclosed in the embodiment of the present invention；
Fig. 3 A is the structural representation of chopper amplifier disclosed in the embodiment of the present invention；
Fig. 3 B is the structural representation of the embodiment of the present invention another chopper amplifier disclosed；
Fig. 4 is the structural representation of Magnetic Sensor integrated circuit disclosed in the embodiment of the present invention；
Fig. 5 is the circuit diagram of rectification circuit disclosed in the embodiment of the present invention；
Fig. 6 is the circuit diagram of Hall sensor and the first chopping switch disclosed in the embodiment of the present invention；
Fig. 7 is the signal schematic representation in circuit shown in Fig. 6；
Fig. 8 is the structural representation of filter circuit disclosed in the embodiment of the present invention；
Fig. 9 is the structural representation of comparison circuit disclosed in the embodiment of the present invention；
Figure 10 is the disclosed principle schematic for judging polarity of the magnetic field of the embodiment of the present invention；
Figure 11 is each signal output schematic diagram under cycle clock signal disclosed in the embodiment of the present invention；
Figure 12 is the circuit diagram of output control circuit disclosed in the embodiment of the present invention；
Figure 13 is the circuit diagram of the embodiment of the present invention another output control circuit disclosed；
Figure 14 is the circuit diagram of the embodiment of the present invention another output control circuit disclosed；
Figure 14 A is the circuit diagram of the embodiment of the present invention another output control circuit disclosed；
Figure 15 is the electrical block diagram of electric machine assembly disclosed in the embodiment of the present invention；
Figure 16 is the structural representation of synchronous motor disclosed in the embodiment of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Fig. 1 is the structural representation of Magnetic Sensor disclosed in the embodiment of the present invention, shown in Figure 1, the Magnetic Sensor
Including input port 1, magnetic field detection circuit 2, output port 3.
Input port is used for connecting external power source, provides power supply to magnetic field detection circuit 2.In the present embodiment, the external electrical
Source can be DC source.
The magnetic field detection circuit 2 include for perceive external magnetic field and export detection the signal of telecommunication magnetic induction element 21,
For being amplified disturbing the signal processing unit 22 for processing and for will be through the signal to the detection signal of telecommunication
The detection signal of telecommunication that processing unit 22 is processed is converted to the converting unit 23 of magnetic field detection signal；The magnetic field detection signal can be through
Output port 3 is outwards exported.Preferably, with folded-cascade amplifier 220 in the signal processing unit 22.Preferably,
The magnetic field detection signal is switching mode digital signal.
The detection signal of telecommunication can include field signal and deviation signal.Wherein, the field signal is the magnetic strength
Know the preferable field voltage signal for mating with external magnetic field that element testing is arrived, the deviation signal includes the magnetic induction element
DC shift.Include to eliminate the DC shift of the magnetic induction element to detecting that the signal of telecommunication carries out disturbing processing.
Fig. 2 shows the structural representation of the signal processing unit 22, shown in Figure 2, the signal processing unit
22 include：Baseband frequency and chopping frequency are separated to for the deviation signal that exports the magnetic induction element and field signal
First chopping switch Z1；For separated deviation signal and field signal are amplified and by amplified deviation signal and
Field signal exchanges to the chopper-type amplifier IA of the chopping frequency and the baseband frequency；Preferably, the chopping frequency
More than 100K hertz, the baseband frequency is less than 200 hertz.
In the present embodiment, the input port is used for connecting external ac power source, the baseband frequency and the alternating current
The frequency in source is directly proportional.Specifically, in an example that can realize, the changes of magnetic field of the baseband frequency and external magnetic field
The equal and twice equal to the ac power frequency of frequency.
Referring to Fig. 3 A, in a possible implementation, the chopper-type amplifier IA can include to be sequentially connected
First amplifier A1 and the second chopping switch Z2；Wherein, the first amplifier A1 includes folded-cascade amplifier, for right
The deviation signal of the first chopping switch Z1 output and field signal carry out first order amplification；The second chopping switch Z2 is used
In will carry out the deviation signal of first order amplification through the first amplifier A1 and field signal exchange to the chopping frequency and
Baseband frequency.
The signal processing unit 22 also includes the low pass filtered for eliminating the deviation signal for exchanging to the chopping frequency
Wave circuit LPF.
The low-pass filter circuit LPF can include the first wave filter for eliminating the deviation signal.
Further, in other examples, the low-pass filter circuit LPF is also wrapped in addition to above-mentioned first wave filter
The second wave filter is included, second wave filter is used for filtering the signal of first wave filter output further and putting
Greatly.The gain of first wave filter is less than the gain of second wave filter.The gain of the first amplifier A1 is more than institute
State the gain of the second wave filter.
Fig. 3 B is the structural representation of the embodiment of the present invention another chopper amplifier disclosed, as shown in Figure 3 B, described
Signal processing unit 22 is except the first chopping switch Z1, the chopper-type amplifier IA are (including the first amplifier A1 and
Two chopping switch Z2) and the low pass filter LPF outside, can also include to be connected to the chopper-type amplifier IA and described low
The second amplifier A2 between bandpass filter LPF, the second amplifier A2 are used for the deviation signal through exchanging and magnetic field
Signal carries out second level amplification.Preferably, the second amplifier A2 can be one-stage amplifier.The gain of the first amplifier A1
Gain more than the second amplifier A2.
In other examples, the second amplifier A2 may also be arranged on the circuit knot of the chopper-type amplifier IA
In structure, it is located between the first amplifier A1 and the second chopping switch Z2.
Magnetic Sensor disclosed in the embodiment of the present invention, its internal magnetic field detection circuit can be effectively to input voltage signal
Carry out gain amplification, eliminate the operation such as offset voltage and filtering so that Hall detection circuit output, for indication motor rotor
The hall signal accuracy of polarity of the magnetic field greatly promotes the accuracy high with comparison and reliability.
Fig. 4 shows the Magnetic Sensor integrated circuit according to another embodiment of the present invention, the Magnetic Sensor integrated circuit
Including input port 4, output port 5, rectification circuit 110, magnetic field detection circuit 120 and output control circuit 130.
The input port 4 can include 41 mouthfuls of the first input end of connection external ac power source and the second input port
42.In the present invention, input port connection external power source had both included the situation that input port is directly connected to external power source two ends,
The situation at external power source two ends is serially connected with including input port and external loading, the present invention is not limited to this, specifically regards feelings
Depending on condition.
In one particular embodiment of the present invention, the rectification circuit 110 includes full-wave rectification bridge and complete with described
The voltage regulation unit of the output connection of ripple rectifier bridge, wherein, the full-wave rectification bridge is used for the exchange of alternating current power supply output
Signal is converted into direct current signal, and the voltage regulation unit is used for stable for the direct current signal of full-wave rectification bridge output in preset value
In the range of.Magnetic field detection circuit 120 and output control circuit 130 can be directly or indirectly supplied by the output voltage of rectification circuit 110
Electricity.
Fig. 5 illustrates a kind of physical circuit of rectification circuit 60, and wherein, voltage regulation unit includes to be connected to full-wave rectification bridge 61
Zener diode 621 between two outfans, the full-wave rectification bridge 61 includes：First diode 611 and second of series connection
3rd diode 613 and the 4th diode 614 of diode 612 and series connection；First diode 611 and the described 2nd 2
The common port of pole pipe 612 is electrically connected with first input port VAC+；3rd diode 613 and the 4th diode
614 common port is electrically connected with the second input port VAC-.
Wherein, the input of first diode 611 is electrically connected to form with the input of the 3rd diode 613 entirely
The ground connection outfan of ripple rectifier bridge, the outfan of second diode 612 is electrically connected with the outfan of the 4th diode 614
The voltage output end VDD to form full-wave rectification bridge is met, Zener diode 621 is connected to second diode 612 and the 4th 2
Between the common port of the common port of pole pipe 614 and first diode 611 and the 3rd diode 613.
The magnetic field detection circuit 120 can include：(also referred to as magnetic strength knows unit to the Hall sensor 121 being sequentially connected
Part), the first chopping switch 122, amplifier 123, sampling hold circuit 124, filter circuit 125 and comparison circuit 126.
The outfan of the input connection rectification circuit 110 of the Hall sensor 121, accesses the rectification circuit 110
The DC voltage of output, for giving first chopping switch 122 according to direct voltage output magnetic field perceptual signal.
Fig. 6 is the Hall sensor of the embodiment of the present invention and a kind of physical circuit of the first chopping switch.Wherein, Hall sense
Survey device 121 is Hall Plate, and including two groups of binding posts 11,12,13 and 14 for setting relatively, the first chopping switch 122 includes can
Switching switch 16,18,19 and 20.Changeable switch 16 controls binding post 11 and 14 alternately to turn on power end VCC, can
Switching switch 18 controls binding post 12 and 13 alternately to turn on ground.Changeable switch 19 controls the friendship of binding post 11 and 14
Turn on outfan P1 for property, changeable switch 20 controls binding post 12 and 13 alternately to turn on outfan N1.Institute
State four changeable switches be configured as binding post 11 or 14 one of them with during VCC conducting, binding post 11 or 14
Wherein another and outfan P1 conducting, the binding post relative with the terminal for connecting VCC in 13 with this of binding post 12 and ground
Conducting, binding post 12 and the terminal not connected with ground in 13 are turned on outfan N1.Outfan P1 and N1 exports a pair of difference
Signal.
That is, when changeable switch 16 and 18 control Hall Plate binding post 11 and 13 respectively with power Vcc and
During ground conducting, changeable switch 19 and 20 controls binding post 12 and 14 to turn on as outfan；When changeable switch 16 and 18
Control binding post 14 and 12 is respectively with when power Vcc and ground conducting, and changeable switch 19 and 20 controls binding post 11 and 13
Turn on as outfan.
In alternatively possible scheme, terminals can also be made by configuring switching switch in the half period of clock
Son 11 and 13 is turned on power Vcc and ground respectively, so that binding post 12 and 14 is turned on as outfan；Other half in clock
Cycle switches to makes binding post 12 and 14 turn on power Vcc and ground respectively, so that binding post 13 and 11 is led as outfan
Logical.
Table 1 below illustrates a kind of possible connection side of each binding post in former and later two half periods of a clock cycle
Case.
Table 1
| Binding post | First half cycle | The later half cycle |
| 11 | Vcc | P1 |
| 12 | P1 | Vcc |
| 13 | Ground | N1 |
| 14 | N1 | Ground |
Table 2 below illustrate each binding post in another kind of instantiation a clock cycle former and later two half periods one
Plant possible connection scheme.
Table 2
| Binding post | First half cycle | The later half cycle |
| 11 | Vcc | N1 |
| 12 | P1 | Ground |
| 13 | Ground | P1 |
| 14 | N1 | VCC |
In above two connection scheme, in the later half cycle of a clock cycle, connect power Vcc and ground a pair connects
Connecting terminal is each converted to and ratates 90 degrees the connection terminal of rear corresponding position front along (or counterclockwise) direction clockwise
The connection status of half period, a pair of connection terminal for connecting outfan P1 and N1 is then converted to along (or clockwise) counterclockwise
Rightabout ratates 90 degrees the connection status of the connection terminal in first half cycle of rear corresponding position.In a next clock cycle
First half cycle, each connection terminal then switches back into the connection status of the first half cycle of a clock cycle, by that analogy.
Preferably, power Vcc can be the output to rectification circuit 110 carries out the constant pressure source after lowering and stabilizing blood pressure process.Can
To understand, power supply can also be constant-current source.
Preferably, each changeable switch is realized by a pair of switches, this is all high level conducting to switch or low level is led
Logical, and controlled by the clock signal of a pair of complementation.By providing two pairs of frequencies identical and complementary two-by-two clock to four pairs of switches
Signal can realize aforesaid conduction mode.In the embodiment of the present invention, the frequency of clock signal can be more than 100K hertz, preferably
Hundreds of K hertz.
Fig. 7 is the signal schematic representation in circuit shown in Fig. 6.Wherein, CK1 is clock signal；Vos is Hall sensor 121
Deviation voltage signal, the physical property of Hall Plate 121 determines, it can be assumed that its any moment in clock signal period is all
It is to maintain constant.Vin and-Vin are first half cycle and later half cycle output of the first chopping switch output in clock signal CK1
Preferable field voltage signal, the i.e. interference of 121 unbiased difference signal of Hall Plate preferable output.As previously described, in clock signal
One half period of CK1, binding post 11 and 13 is turned on power Vcc and ground respectively, and binding post 12 and 14 is used as outfan
Conducting；When another half period binding post 12 and 14 of clock signal CK1 is respectively with power Vcc and ground conducting, terminals
Son 11 and 13 is turned on as outfan.In former and later two half periods of clock signal CK1, the preferable magnetic of the first chopping switch output
Field voltage signal magnitude is equal, in opposite direction.Vout is the output signal of the first chopping switch, is deviation signal Vos and ideal
The superposition of field signal Vin.Through the first chopping switch, above-mentioned deviation voltage signal and preferable field voltage Signal separator are to base
Band frequency and chopping frequency.Wherein, chopping frequency is the frequency of clock signal, and baseband frequency is the outside magnetic detected by Hall Plate
The change in polarity frequency of field.
In one embodiment of the present invention, the preferable field voltage signal that the Hall sensor 121 is exported is very
Little, usual only several millivolts of zero point, deviation signal Vos is close to 10 millivolts, therefore the later stage need to eliminate deviation signal, and to ideal
Signal carries out high-gain process.
In the present embodiment, amplifier 123 can adopt the chopper amplifier shown in Fig. 3 B, including the first amplifier A1, the
Two chopping switch Z2 and the 3rd amplifier A2.First amplifier A1 and the second chopping switch be used for separated deviation signal and
Field signal is amplified and amplified deviation signal and field signal is exchanged to the chopping frequency and base band frequency
Rate.Second level amplifier A2 amplifies further to the signal after exchange.Wherein, the first amplifier A1 is collapsible amplifier,
Second amplifier A2 can be one-stage amplifier.
In the present embodiment, the output of the first amplifier A1 is also a pair of differential signal, and the second chopping switch Z2 is configured to
The later half cycle to differential signal in each clock cycle directly being exported in the first half cycle of each clock cycle, this is right
Differential signal exchanges output, and a pair of output signal of the second chopping switch is expressed as P2 and N2.
The sampling hold circuit 124 is used for gathering out each signal from the differential signal P2 and N2 when different
The signal value output of clock half period, i.e. former and later two half periods is simultaneously exported to the filter circuit 125, and wherein P2 is when different
The sampled signal of clock half period is P2A and P2B, N2 are N2A and N2B in the sampled signal of corresponding clock half cycle.
The filter circuit 125 is used for carrying out elimination deviation processing to P2A＆P2B the and N2A＆N2B signal, and can
Gain amplification is carried out to eliminating the differential signal that obtains after deviation, output gain amplify after differential signal P3 and N3 to the ratio
Compared with circuit 126.
In the present embodiment, the filter circuit 125 is low pass filter.With reference to shown in Fig. 8, preferably, filter circuit 125
The first wave filter F1 and the second wave filter F2 can be included.First wave filter F1 to two pairs of sampled signals P2A, P2B and
N2A, N2B carry out the process of addition two-by-two, to eliminate deviation signal, while gain amplification can be carried out to signal；Second wave filter
F2 is used for being filtered the differential signal of the first wave filter F1 output again and gain is amplified, a pair of differential signal P3 of output and
N3.
It is appreciated that in a further embodiment, filter circuit 125 only can also arrange a wave filter, now in which
Resistance value in portion's circuit needs very great talent to ensure that signal is obtained than larger gain.
The comparison circuit 126 is used for being compared the differential signal P3 and N3 with reference voltage, output switch type
Magnetic field detection signal；The magnetic field detection signal is used for the polarity of the external magnetic field for indicating that the Hall sensor 121 is detected；
The outfan connection output control circuit 130 of the comparison circuit 126.
Fig. 9 is the structural representation of AD conversion unit disclosed in the embodiment of the present invention (comparison circuit 126), and Figure 10 is this
The disclosed principle schematic for judging polarity of the magnetic field of inventive embodiments, referring to shown in Fig. 9 and Figure 10, the comparison circuit 126 is relatively
Good for hysteresis comparator, including：First comparator C1, the second comparator C2 and latching logic circuit S；The first comparator
C1 and the second comparator C2 connect differential signal P3, N3, and a pair of differential reference voltage Vh and tetra- road signal of Vl respectively, and first
This of comparator C1 and the second comparator C2 is to differential reference voltage reversal connection.First comparator C1 is used for filter circuit output
Voltage signal is compared with higher thresholds Rh, and the second comparator C2 is used for the voltage signal of filter circuit output and a relatively low threshold
Value Rl compares.The outfan of first comparator C1 and the second comparator C2 is transfused to the latching logic circuit S.
It is filter circuit output the comparative result of first comparator C1 to be configured in conjunction with Figure 10, latching logic circuit S
Voltage signal makes comparison circuit 126 export the when reaching operating point Bop more than the magnetic field intensity of the higher thresholds or external magnetic field
One level (as high level), expression external magnetic field is relatively to show that filter circuit is exported a kind of magnetic polarity, when the second comparator C2
Voltage signal when being not up to point of release Brp less than the magnetic field intensity of the lower threshold or external magnetic field, make comparison circuit 126 defeated
Go out second electrical level (low level), represent external magnetic field for another kind of magnetic polarity, when the voltage signal of filter circuit output is in relatively
Between high threshold and lower threshold are low, or the magnetic field intensity of external magnetic field between operating point Bop and point of release Brp when, make ratio
Keep former output state constant compared with the output of circuit 126.
It is appreciated that in another embodiment, latching logic circuit S can be configured to the comparative result of first comparator C1
It is to make ratio when the voltage signal of filter circuit output reaches operating point Bop more than the magnetic field intensity of the higher thresholds or external magnetic field
Compared with the output output low level of circuit 126；When the voltage signal that the second comparator C2 relatively draws filter circuit output is less than this relatively
When the magnetic field intensity of Low threshold or external magnetic field is not up to point of release Brp, comparison circuit 126 is made to export high level；Work as filtered electrical
The voltage signal of road output in higher thresholds and lower threshold low between, or the magnetic field intensity of external magnetic field is in operating point Bop
When and point of release Brp between, the output of comparison circuit 126 is made to keep former output state constant.
In the embodiment of the present invention, higher to the sensitivity requirements of the Hall sensor 121, Hall sensor 121 is exported
Actually detected signal can be very little, may for example only have several millivolts of zero point, it is therefore desirable to which which is amplified accordingly, this is just
It is required that the amplifier 123 has the high yield value of a comparison, by the actually detected signal of the Hall sensor 121 to the greatest extent
May amplify, be easy to subsequently process which accordingly.
In preferred embodiments, the supply voltage about 2.5V of magnetic field detection circuit, the amplification of signal processing unit
Between 1000 times to 2000 times, preferably 1600 times, can be by with a few persons of outstanding talent of the zero point that exports the Hall sensor 121
The preferable field voltage of volt is amplified to half of the supply voltage or so.In signal processing unit, amplifier Main Function is letter
Number amplification, filter circuit Main Function be eliminate interference signal.In filter circuit, the first wave filter F1 is substantially carried out filtering,
Its yield value can be less than the yield value of the second wave filter.Therefore, the yield value of the amplifier 123 is more than the filter circuit
Yield value, the yield value of the first wave filter is more than the yield value of the second wave filter.In implementing at one, the amplifier
123 be yield value can be 50, the yield value of the filter circuit 125 can be 32 or so.In implementing at one, first
The yield value of wave filter can be 4, and the second wave filter F2 yield value can be 8.
In the amplifier 123 in the embodiment of the present invention using folded cascode structure amplifier, this structure can
While high-gain and high bandwidth disposal ability are provided, with good frequency characteristic and Slew Rate.
In conjunction with Figure 11, the signal processing to the signal processing unit of magnetic field detection circuit disclosed in the embodiment of the present invention
Illustrate, Figure 11 left side illustrates each differential signal output of each module under cycle clock signal, and the right is corresponding signal
Frequency domain schematic diagram.
From presented hereinbefore to content knowable to, output signal Vout of the first chopping switch is deviation signal Vos and ideal
The superposition of field signal Vin, is simultaneously equal to the difference of differential signal P1 and N1, and differential signal P1 and N1 is equal in magnitude, direction phase
Instead.Understand in former and later two half periods of clock signal CK1 according to previously mentioned, the preferable magnetic field electricity of the first chopping switch output
Pressure signal magnitude is equal, in opposite direction.Illustrate with reference to Figure 11 left side, signal P1 was used respectively in former and later two half periods of clock signal
P1A and P1B represent, signal N1 was represented with N1A and N1B respectively in former and later two half periods of clock signal, and its output is respectively：
P1A=(Vos+Vin)/2；P1B=(Vos-Vin)/2
N1A=-P1A=- (Vos+Vin)/2；N1B=-P1B=- (Vos-Vin)/2
For ease of understanding, the coefficient 1/2 of differential signal is omitted in explained below, and through the first amplifier A1, second cuts
The input signal of ripple switch is used in former and later two half periods of clock signal respectively for a pair of differential signal P1 ' and N1 ', signal P1 '
P1A ' and P1B ' represents, signal N1 ' was represented with N1A ' and N1B ' respectively in former and later two half periods of clock signal, and its output is respectively
For：
P1A '=A (Voff+Vin)/2；P1B '=A (Voff-Vin)/2
N1A '=- P1A '=- A (Voff+Vin)/2；N1B '=- P1B '=- A (Voff-Vin)/2
Wherein, A is the amplification of the first amplifier, and Voff is the droop in the output signal of the first amplifier,
Equal to the droop Vos of Hall sensor 121 and the droop sum of the first amplifier.For ease of understanding, retouching below
State the middle omission coefficient of differential signal and the amplification coefficient of amplifier.
Then after sampling hold circuit：
Second chopping switch Z2 is configured to the first half cycle in each clock cycle and directly exports this to differential signal
In the later half cycle of each clock cycle, this is exchanged output, a pair of differential output signal of the second chopping switch to differential signal
It is expressed as P2 and N2.Signal P2 was represented with P2A and P2B respectively in former and later two half periods of clock signal, and signal N2 is believed in clock
Number former and later two half periods represent, its output is respectively respectively with N2A and N2B：
P2A=P1A '=(Voff+Vin)；P2B=N1B '=- (Voff-Vin)
N2A=N1A '=- (Voff+Vin)；N2B=P1B '=(Voff-Vin)；
Sampling hold circuit 124 for each signal in differential signal P2 and N2, each clock cycle former and later two
Gathered data it is divided into two-way sampled signal and each exports in half period respectively, i.e., sampling hold circuit exports two pairs of sampling letters
Number, it is for a pair P2A and P2B, another to being N2A and N2B.
The above-mentioned four road signals for obtaining through over-sampling export P3 and N3 through the filter circuit；The filtering of filter circuit
Two pairs of sampled signals that device is exported to sampling hold circuit carry out addition process respectively, and its output is respectively：
P3=P2A+P2B=(Voff+Vin)+(- (Voff-Vin))=2Vin
N3=N2A+N2B=- (Voff+Vin)+(Voff-Vin)=- 2Vin
As can be seen that only preferable field voltage signal in output signal P3 of filter circuit and N3, deviation signal by
Eliminate.
Illustrate on the right of Figure 11, from from the perspective of frequency domain, through the first chopping switch, it is inclined that magnetic induction element is exported
Difference signal and field signal are split into baseband frequency and chopping frequency, and chopping frequency is the frequency of clock signal, such as above institute
State, chopping frequency is preferably hundreds of K hertz, baseband frequency is equal with the change frequency of external magnetic field.When by the present embodiment
When Magnetic Sensor integrated circuit is used for synchronous motor control, external magnetic field can be p-m rotor magnetic field, and its change frequency is equal to be handed over
2 times of stream supply frequency.When the synchronous motor is by common 50 hertz or 60 hertz of mains electricity power supply, baseband frequency
For 100 hertz or 120 hertz.Through the second chopping switch, amplified deviation signal and field signal are switched to described cutting
Wave frequency and baseband frequency.As, in the embodiment of the present invention, the frequency domain span of chopping frequency and baseband frequency is very big, it is desirable to institute
State amplifier 123, while with high-gain, also there is high bandwidth disposal ability, to realize the gain to ideal detection signal
Amplify.
In another embodiment of the present invention, the detection signal of telecommunication of magnetic field detection circuit output includes field signal and partially
Difference signal, the signal processing unit includes that the deviation signal for exporting the magnetic induction element and field signal are separated to
The chopping switch of baseband frequency and chopping frequency, for eliminate be separated to the chopping frequency deviation signal high-pass filtering
Device and the field signal solution is recalled to the demodulator of baseband frequency.
Output control circuit 130 is used at least being based on the switching mode detection signal, makes the Magnetic Sensor integrated circuit
At least from the output port to the outside first state for flowing out electric current and from outside to the output port inflow current
Run under the one of state of second state.
In a preferred embodiment, output control circuit 130 is configured at least based on the switching mode detection signal,
The integrated circuit is made at least from the output port to the outside first state for flowing out electric current and from outside to the output
Switch between the second state of port inflow current.
What deserves to be explained is, in the embodiment of the present invention, Magnetic Sensor integrated circuit is cut between first state and the second state
Change operation, however it is not limited to which one of state switches to the situation of another state immediately after terminating, also include one of shape
State terminates the situation that rear separated in time switches to another state again.In one preferably application example, two states
In the interval time of switching, the output port of Magnetic Sensor integrated circuit is no exported.
On the basis of above-described embodiment, in one embodiment of the invention, the output control circuit 130 includes：
First switch and second switch, the first switch is connected in first current path with the output port, and described
Two switches are connected in the second current path in opposite direction with first current path with the output port, and described first
Switch and second switch are selectively turned under the control of the magnetic field detection information.Preferably, the first switch is permissible
For audion, the second switch can be audion or diode, and the present invention is not limited to this, is depended on the circumstances.
Specifically, in one embodiment of the invention, as shown in figure 12, the first switch 31 and second switch 32 are
The semiconductor switch of a pair of complementation.The first switch 31 is turned on for low level, and the second switch 32 is turned on for high level, its
In, the first switch 31 is connected in the first current path with the output port Pout, the second switch 32 with described
Output port Pout is connected in the second current path, the control of the first switch 31 and 32 two switches of the second switch
End is all connected with magnetic field detection circuit 20, and the current input terminal of first switch 31 connects high voltage (such as DC source), and electric current is defeated
Go out end to be connected with the current input terminal of second switch 32, the current output terminal of second switch 32 connects low voltage (such as).If
The magnetic field detection information that the magnetic field detection circuit 20 is exported is low level, and first switch 31 is turned on, and second switch 32 disconnects, and bears
Carry electric current to flow outwardly from high voltage through first switch 31 and output port Pout, if the magnetic field detection circuit 20 output
Magnetic field detection information is high level, and second switch 32 is turned on, and first switch 31 disconnects, and load current flows into output port from outside
Pout simultaneously flows through second switch 32.In the example of Figure 12, first switch 31 is positive channel mos field effect transistor
Pipe (p-type MOSFET), second switch 32 is for bearing channel mos field-effect transistor (N-type MOSFET).Permissible
It is understood by, in other embodiments, first switch and second switch can also be other kinds of semiconductor switch, for example may be used
To be other field-effect transistors such as junction field effect transistor (JFET) or metal semiconductor field effect transis (MESFET).
In another embodiment of the present invention, as shown in figure 13, the switch that the first switch 31 is turned on for high level
Pipe, the second switch 32 is the negative electrode connection magnetic of one-way conduction diode, the control end of first switch 31 and second switch 32
Field detection circuit 20.The output of the current input terminal connection rectification circuit of first switch 31, the current output terminal of first switch 31
It is all connected with output port Pout with the anode of second switch 32.Wherein, the first switch 31 and the output port Pout
It is connected in the first current path, the output port Pout, the second switch 32 are connected with the magnetic field detection circuit 20
In the second current path, if the magnetic field detection information of the magnetic field detection circuit 20 output is high level, first switch 31 is led
Logical, second switch 32 disconnects, and load current self-rectifying circuit is flowed outwardly through first switch 31 and output port Pout, if described
The magnetic field detection information that magnetic field detection circuit 20 is exported is low level, and second switch 32 is turned on, and first switch 31 disconnects, load electricity
Stream flows into output port Pout and flows through second switch 32 from outside.It is appreciated that in other embodiments of the invention, described
First switch 31 and the second switch 32 can also be other structures, and the present invention is not limited to this, specifically optionally and
Fixed.
In another embodiment of the present invention, the output control circuit 30 has and flows outwardly from the output pin
First current path of electric current, the second current path of electric current is flowed inward into from the output pin and is connected to described
Switch in one current path and the one of path of the second current path, the switch is by the magnetic field detection circuit output
Magnetic field detection information controls so that the first current path and the conducting of the second current path selectivity.Optionally, first electric current
Switch is not set in path and the second current path other in which path.
Implement as one kind, as shown in figure 14, the output control circuit 30 includes a unidirectional conducting switch 33, single
Guide is opened up pass 33 and is connected in the first current path with output port Pout, and its current input terminal can connect magnetic field detection circuit
20 outfan, the outfan of magnetic field detection circuit 20 can be also connected to and the described first electricity through resistance R1 and output port Pout
In logical circulation road the second current path in opposite direction.Unidirectional conducting switch 33 is turned on when magnetic field induction signal is for high level, is born
Carry electric current to flow outwardly through unidirectional conducting switch 33 and output port Pout, the magnetic field induction signal is unidirectional during low level
Open up pass 33 to disconnect, load current flows into output port Pout and flow through resistance R1 and magnetic field detection circuit 20 from outside.As
A kind of replacement, the resistance R1 in second current path can also replace with unidirectional with 33 reverse parallel connection of unidirectional conducting switch
Conducting switch.So, the load current for flowing out from output port and the load current for flowing into more are balanced.
In another kind is implemented, as shown in Figure 14 A, the output control circuit 30 includes that differential concatenation is examined in magnetic field
Diode D1 and D2 between the outfan of the slowdown monitoring circuit 20 and output port Pout electricity in parallel with the diode D1 for connecting and D2
The resistance R1 and resistance R2 being connected between the common port of diode D1 and D2 and power Vcc, wherein, the negative electrode of diode D1
It is connected with the outfan of magnetic field detection circuit 20.Diode D1 is controlled by magnetic field detection information.It is high electricity in magnetic field detection information
Diode D1 cut-off at ordinary times, load current is flowed outwardly from output port Pout through resistance R2 and diode D2, the magnetic field inspection
When measurement information is low level, load current flows into output port Pout and flows through resistance R1 and magnetic field detection circuit 20 from outside.
The Magnetic Sensor integrated circuit of the embodiment of the present invention, its internal magnetic field detection circuit can be effectively to input voltage
Signal carries out gain amplification, eliminates the operation such as offset voltage and filtering so that Hall detection circuit output, for indication motor
The hall signal accuracy of rotor field polarity greatly promotes the accuracy high with comparison and reliability.
With reference to a concrete application, the Magnetic Sensor integrated circuit provided by the embodiment of the present invention is described.
As shown in figure 15, the embodiment of the present invention additionally provides a kind of electric machine assembly, and the electric machine assembly includes：Exchanged by one
Two-way admittance switch 300 and above-mentioned of the present invention of foundation that the motor 200 that power supply 100 is powered is connected with the motor 200
The Magnetic Sensor integrated circuit 400 provided by one embodiment, the output port of the Magnetic Sensor integrated circuit 400 is double with described
Guide opens up the control end electrical connection for closing 300.Preferably, two-way admittance switch 300 can be triac
(TRIAC).It is appreciated that two-way admittance switch also can be realized by other kinds of suitable switch, for example, can include reversely
Two in parallel thyristors, and corresponding control circuit is set, according to Magnetic Sensor integrated circuit output port defeated
Go out signal and control the two thyristors through the control circuit according to predetermined way.
Preferably, the electric machine assembly also includes reduction voltage circuit 500, for providing after 100 blood pressure lowering of the alternating current power supply
To the Magnetic Sensor integrated circuit 400.Magnetic Sensor integrated circuit 400 is installed near the rotor of motor 200 to perceive rotor
Changes of magnetic field.
On the basis of above-described embodiment, in one particular embodiment of the present invention, the motor is synchronous motor, can
To understand, the Magnetic Sensor integrated circuit of the present invention is applicable not only to synchronous motor, is also applied for other kinds of magneto
As DC brushless motor.As shown in figure 16, the synchronous motor include stator and can relative stator rotation rotor 11.Stator has
The stator winding 16 for having stator core 12 and being set around in stator core 12.Stator core 12 can be by pure iron, cast iron, cast steel, electricity
The soft magnetic materials such as work steel, silicon steel are made.Rotor 11 is with permanent magnet, and when stator winding 16 is connected with alternating current power supply, rotor 11 is steady
The state stage, wherein f was the frequency of the alternating current power supply with the rotating speed constant-speed operation of 60f/p circle/minute, and p is the number of pole-pairs of rotor.
In the present embodiment, stator core 12 has two relative pole portions 14.Each pole portion has a polar arc face 15, the outer surface of rotor 11 with
Polar arc face 15 is relative, forms substantially uniform air gap between the two.Substantially homogeneous air gap alleged by the application, refers to stator with rotor
Between most of form even air gap, only fewer parts be.Preferably, set on the polar arc face 15 in stator poles portion
The starting groove 17 of indent, the part on polar arc face 15 in addition to groove 17 is started is then concentric with rotor.Above-mentioned configuration can form inequality
Even magnetic field, it is ensured that rotor its pole axis S1 when static inclines an angle with respect to the central shaft S2 in stator poles portion, it is allowed to motor
When be energized in the presence of integrated circuit every time, rotor can be with starting torque.The pole axis S1 of wherein rotor refers to two poles of rotor
Demarcation line between the different magnetic pole of property, the central shaft S2 in stator poles portion 14 refers to the line through two 14 centers of Ji Bu of stator.
In the present embodiment, stator and rotor are respectively provided with two magnetic poles.It should be understood that in more embodiments, the magnetic of stator and rotor
Number of poles can also be unequal, and with more magnetic poles, such as four, six etc..
On the basis of above-described embodiment, in one embodiment of the invention, the output control circuit 30 is configured
It is that positive half period and the magnetic field detection circuit 20 detect that the magnetic field of the p-m rotor is first in the alternating current power supply 100 to be
Polarity or the alternating current power supply 100 are the magnetic field that negative half-cycle and the magnetic field detection circuit 20 detect the p-m rotor
It is second polarity chron opposite polarity with described first, turns on two-way admittance switch 300.When the alternating current power supply 100
For negative half-cycle and p-m rotor it is first polarity, or the alternating current power supply 100 is that positive half period and the permanent magnetism turn
Son is the second polarity chron, ends two-way admittance switch 300.
Preferably, the signal that the output control circuit 30 is configured to export in the alternating current power supply 100 is located at just half
Cycle and the magnetic field detection circuit 20 detect that the magnetic field of the p-m rotor is the first polarity chron, and control electric current is by described integrated
Circuit flows to two-way admittance switch 300, and the signal for exporting in the alternating current power supply 100 is located at negative half-cycle and the magnetic
Detection circuit 20 detect that the magnetic field of the p-m rotor is second polarity chron opposite polarity with described first, control electric current by
The two-way admittance switch 300 flows to the integrated circuit.It is appreciated that p-m rotor is the first magnetic polarity and alternating current power supply being
Positive half period, or p-m rotor, when to be the second magnetic polarity and alternating current power supply be negative half-cycle, the integrated circuit flows out or flows
Enter the situation that electric current had both included to have electric current to flow through in the whole persistent period section of above-mentioned two situations, also include above-mentioned two situations
Under only have the situation that electric current flows through in part-time section.
In a preferred embodiment of the present invention, two-way admittance switch 300 adopts triac (TRIAC),
Rectification circuit 60 using the circuit shown in Fig. 5, output control circuit using the circuit shown in Figure 12, the in output control circuit 30
The voltage output end of the current input terminal connection full-wave rectification bridge 61 of one switch 31, the current output terminal connection of second switch 32 is complete
The ground connection outfan of ripple rectifier bridge 61.When the signal that alternating current power supply 100 is exported is located at positive half period and the magnetic field detection circuit
During 20 output low level, in output control circuit 30, first switch 31 is turned on and second switch 32 disconnects, and electric current flows successively through friendship
Stream power supply 100, motor 200, the first input end of integrated circuit 400, reduction voltage circuit (not shown), full-wave rectification bridge 61
612 outfan of the second diode, the first switch 31 of output control circuit 30, from output port flow to two-way admittance switch
300 return to alternating current power supply 100.After TRIAC300 conducting, the series connection that reduction voltage circuit 500 and Magnetic Sensor integrated circuit 400 are formed
Branch road is shorted, and Magnetic Sensor integrated circuit 400 stops output because of unpowered voltage, and TRIAC300 is due to flowing through two
Electric current between anode sufficiently large (maintaining electric current higher than which), the situation of no driving current between control pole and its first anode
Under, TRIAC300 is remained on.When the signal that alternating current power supply 100 is exported is located at negative half-cycle and the magnetic field detection circuit 20
During output high level, in output control circuit 30, first switch 31 disconnects and second switch 32 is turned on, and electric current is from alternating current power supply 100
Flowing out, output port, the second switch 32 through output control circuit 30, full-wave rectification bridge 61 is flowed into from two-way admittance switch 300
Ground connection outfan and the first diode 611, the first input end of integrated circuit 400, motor 200 return to alternating current power supply 100.
Likewise, after TRIAC300 conducting, Magnetic Sensor integrated circuit 400 stops output short-circuit because being shorted, and TRIAC300 then may be used
It is held on.When the signal that alternating current power supply 100 is exported is located at positive half period and the magnetic field detection circuit 20 output high level, or
The signal that person's alternating current power supply 100 is exported is located at negative half-cycle and the magnetic field detection circuit 20 output low level, output control electricity
In road 30, first switch 31 and second switch 32 can not all be turned on, and TRIAC300 ends.Thus, the output control circuit 30 can
Change in polarity based on alternating current power supply 100 and magnetic field detection information, make integrated circuit control two-way admittance switch 300 with pre-
Determine mode to switch between conducting and cut-off state, and then control the step mode of stator winding 16, the change for producing stator
Magnetic field coordinates the magnetic field position of rotor, only drags rotor rotation along single direction, so as to rotor tool when ensureing that motor is energized every time
There is fixing direction of rotation.
In the embodiment of the present invention, magnetic field detection signal is switching mode detection signal, in the steady-state process of motor, the switch
The switches switching frequency of type detection signal is equal to the twice of the frequency of the alternating current power supply.
In the electric machine assembly of another embodiment of the present invention, motor can be series at external communication with two-way admittance switch
Between both ends of power, it is integrated with reduction voltage circuit and Magnetic Sensor that motor switchs the first series arm for being formed of connecting with two-way admittance
The second series arm parallel connection that circuit is formed.The output port of Magnetic Sensor integrated circuit is connected with two-way admittance switch, control
Two-way admittance switch switches in a predefined manner between conducting and cut-off state, and then controls the step mode of stator winding.
Electric machine assembly in the embodiment of the present invention can be used for but be not limited to the equipment such as pump, fan, household electrical appliance, car
In, the household electrical appliance can be for example washing machine, dish-washing machine, smoke exhaust ventilator, exhaust fan etc..
It is appreciated that above simply with reference to a kind of possible application to retouching that the Magnetic Sensor integrated circuit of the present invention is made
State, the Magnetic Sensor of the present invention is not limited in above-mentioned application, for example, is applied not only to Motor drive, it may also be used for other have
The application of magnetic field detection.
In the present embodiment, the Magnetic Sensor detection circuit of the Magnetic Sensor IC interior can be effectively to input electricity
Pressure signal carries out gain amplification, eliminates the operation such as offset voltage and filtering so that magnetic field detection circuit output, for indicating electricity
The magnetic field detection signal accuracy of machine rotor polarity of the magnetic field greatly promotes the accuracy high with comparison and reliability.
In this specification, each embodiment is described by the way of going forward one by one, and what each embodiment was stressed is and other
The difference of embodiment, between each embodiment identical similar portion mutually referring to.
Also, it should be noted herein, such as first and second or the like relational terms are used merely to one
Entity or operation are made a distinction with another entity or operation, and are not necessarily required or implied between these entities or operation
There is any this actual relation or order.And, term " including ", "comprising" or its any other variant are intended to contain
The including of lid nonexcludability, so that a series of process including key elements, method, article or equipment not only include that those will
Element, but also other key elements including being not expressly set out, or also include for this process, method, article or equipment
Intrinsic key element.In the absence of more restrictions, the key element for being limited by sentence "including a ...", it is not excluded that
Also there is other identical element in process, method, article or equipment including the key element.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or use the present invention.
Multiple modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized without departing from the spirit or scope of the present invention in other embodiments.Therefore, the present invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope for causing.
Claims (21)
1. a kind of Magnetic Sensor integrated circuit, it is characterised in that include for connect external power source input port, magnetic field detection
Circuit, output port and output control circuit；
The magnetic field detection circuit include for perceive external magnetic field and export detection the signal of telecommunication magnetic induction element, for institute
State the detection signal of telecommunication to be amplified disturbing the signal processing unit for processing and for will be at the signal processing unit
The detection signal of telecommunication of reason is converted to the converting unit of magnetic field detection signal；
The signal processing unit has amplifier and filter circuit, and the gain of the amplifier is more than the increasing of the filter circuit
Benefit；
The output control circuit is used at least being based on the magnetic field detection signal, so that the Magnetic Sensor integrated circuit is at least existed
From the output port to the outside first state for flowing out electric current and from outside the second shape to the output port inflow current
Run under the one of state of state.
2. Magnetic Sensor integrated circuit according to claim 1, it is characterised in that the detection signal of telecommunication includes that magnetic field is believed
Number and deviation signal, the amplifier be chopper-type amplifier, the filter circuit be low-pass filter circuit, the signal processing
Unit includes：
Deviation signal and field signal for exporting the magnetic induction element is separated to the of baseband frequency and chopping frequency
One chopping switch；
Hand over for being amplified to separated deviation signal and field signal and by amplified deviation signal and field signal
Change to the chopper-type amplifier of the chopping frequency and the baseband frequency；And
For eliminating the low-pass filter circuit of the deviation signal for exchanging to the chopping frequency.
3. Magnetic Sensor integrated circuit according to claim 2, it is characterised in that the chopping frequency is more than 100K hertz
And/or the baseband frequency is less than 200 hertz.
4. Magnetic Sensor integrated circuit according to claim 2, it is characterised in that the chopper-type amplifier is included successively
First amplifier of connection and the second chopping switch；Wherein,
First amplifier includes folded-cascade amplifier, for deviation signal that first chopping switch is exported and
Field signal carries out first order amplification；
Second chopping switch is used for carrying out deviation signal and the field signal of first order amplification through first amplifier
Exchange to the chopping frequency and baseband frequency.
5. Magnetic Sensor integrated circuit according to claim 4, it is characterised in that the signal processing unit is also included even
The second amplifier being connected between the chopper-type amplifier and the low pass filter, second amplifier is used for passing through
The deviation signal of exchange and field signal carry out second level amplification.
6. Magnetic Sensor integrated circuit according to claim 5, it is characterised in that the gain of first amplifier is more than
The gain of second amplifier.
7. Magnetic Sensor integrated circuit according to claim 4, it is characterised in that first amplifier export a pair poor
Sub-signal, second chopping switch be configured to the later half cycle in each clock cycle by this differential signal is exchanged defeated
Go out.
8. Magnetic Sensor integrated circuit according to claim 4, it is characterised in that the signal processing unit also includes：
The sampling hold circuit being connected between second chopping switch and the low pass filter, the sampling hold circuit
For to each signal in the differential signal after exchange, being gathered within former and later two half periods of each clock cycle respectively
Data are simultaneously divided into two-way sampled signal and each export.
9. Magnetic Sensor integrated circuit according to claim 8, it is characterised in that the low-pass filter circuit includes first
Wave filter, first wave filter is used for carrying out at addition two pairs of sampled signals of sampling hold circuit output respectively
Reason, eliminates deviation signal.
10. Magnetic Sensor integrated circuit according to claim 9, it is characterised in that the low-pass filter circuit also includes
Second wave filter, second wave filter is used for the differential signal of first wave filter output being filtered amplify.
11. Magnetic Sensor integrated circuits according to claim 10, it is characterised in that the gain of first wave filter is little
Gain in second wave filter.
12. Magnetic Sensor integrated circuits according to claim 10, it is characterised in that the gain of first amplifier is big
Gain in second wave filter.
13. Magnetic Sensor integrated circuits according to claim 1, it is characterised in that the output control circuit includes
One switch and second switch, the first switch is connected in the first current path with the output port, the second switch
Second current path in opposite direction with first current path, the first switch and are connected to the output port
Two switches are selectively turned under the control of the switching mode detection signal.
14. Magnetic Sensor integrated circuits according to claim 1, it is characterised in that the magnetic field detection signal is switch
Type detection signal, the input port is used for connecting external ac power source, the switches switching frequency of the switching mode detection signal
The twice of or frequency equal to the alternating current power supply proportional to the frequency of the alternating current power supply.
15. Magnetic Sensor integrated circuits according to claim 1, it is characterised in that the output control circuit has certainly
The output pin flow outwardly electric current the first current path, flow inward into from the output pin electric current the second electric current lead to
Road and the switch being connected in first current path and the one of path of the second current path, the switch is by institute
State the magnetic field detection information control of magnetic field detection circuit output so that the first current path and the second current path selectivity are led
Logical.
A kind of 16. Magnetic Sensor integrated circuits, it is characterised in that include for connect external power source input port, outfan
Mouth and magnetic field detection circuit, the magnetic field detection circuit includes to detect that the magnetic strength of the signal of telecommunication is known for perceiving external magnetic field and exporting
Element, it is used for the detection signal of telecommunication to be amplified disturbing the signal processing unit for processing and for will be through the letter
The detection signal of telecommunication of number processing unit processes is converted to the converting unit of magnetic field detection signal；Wherein, the signal processing unit
With amplifier and filter circuit, the gain of the amplifier is more than the gain of the filter circuit.
17. Magnetic Sensor integrated circuits according to claim 16, it is characterised in that the signal processing unit has power
Profit requires the feature of signal processing unit described in any one of 2-12.
18. Magnetic Sensor integrated circuits according to claim 16, it is characterised in that also include with the input port even
The rectification circuit for connecing, the magnetic field detection circuit is powered by the output voltage of the rectification circuit.
19. a kind of electric machine assemblies, it is characterised in that including motor and motor-drive circuit, the motor-drive circuit has such as
The arbitrary described Magnetic Sensor integrated circuit of claim 1 to 18.
A kind of 20. application apparatus with electric machine assembly as claimed in claim 19.
21. application apparatus as claimed in claim 20, it is characterised in that the application apparatus be pump, fan, household electrical appliance or
Person's vehicle.
Priority Applications (8)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020160100329A KR20170017841A (en) | 2015-08-07 | 2016-08-05 | A magnetic sensor and an integratred circuit |
| DE102016114588.2A DE102016114588A1 (en) | 2015-08-07 | 2016-08-05 | A magnetic sensor and an integrated circuit |
| DE202016104335.2U DE202016104335U1 (en) | 2015-08-07 | 2016-08-05 | A magnetic sensor and an integrated circuit |
| JP2016155744A JP2017090439A (en) | 2015-08-07 | 2016-08-08 | Magnetic sensor and integrated circuit |
| MX2016010278A MX2016010278A (en) | 2015-08-07 | 2016-08-08 | A magnetic sensor and an integrated circuit. |
| US15/231,213 US9696182B2 (en) | 2014-08-08 | 2016-08-08 | Magnetic sensor and an integrated circuit |
| BR102016018233A BR102016018233A2 (en) | 2015-08-07 | 2016-08-08 | magnetic sensor, integrated circuit, and motor assembly |
| JP2016005930U JP3211276U (en) | 2015-08-07 | 2016-12-12 | Magnetic sensor and integrated circuit |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNPCT/CN2015/086422 | 2015-08-07 | ||
| PCT/CN2015/086422 WO2016019921A1 (en) | 2014-08-08 | 2015-08-07 | Motor assembly and integrated circuit for motor drive |
| CN201610205912 | 2016-04-01 | ||
| CN2016102059121 | 2016-04-01 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106443524A true CN106443524A (en) | 2017-02-22 |
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ID=58020478
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620532177.0U Active CN205982595U (en) | 2015-08-07 | 2016-06-02 | Magnetic sensor integrated circuit , motor element and application apparatus |
| CN201610392144.5A Withdrawn CN106443524A (en) | 2014-08-08 | 2016-06-02 | Magnetic sensor integrated circuit, motor assembly and application device |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620532177.0U Active CN205982595U (en) | 2015-08-07 | 2016-06-02 | Magnetic sensor integrated circuit , motor element and application apparatus |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN205982595U (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108776314A (en) * | 2018-04-18 | 2018-11-09 | 微传智能科技（常州）有限公司 | ASIC processing circuits, offset voltage and low-frequency noise removal circuit, threshold decision circuit |
| CN111344536A (en) * | 2017-11-08 | 2020-06-26 | 罗伯特·博世有限公司 | Method for operating a magnetic field sensor and associated magnetic field sensor device |
| CN111948582A (en) * | 2019-05-14 | 2020-11-17 | 日本电产株式会社 | Electric motor |
-
2016
- 2016-06-02 CN CN201620532177.0U patent/CN205982595U/en active Active
- 2016-06-02 CN CN201610392144.5A patent/CN106443524A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111344536A (en) * | 2017-11-08 | 2020-06-26 | 罗伯特·博世有限公司 | Method for operating a magnetic field sensor and associated magnetic field sensor device |
| US11255999B2 (en) | 2017-11-08 | 2022-02-22 | Robert Bosch Gmbh | Method and system for operating a magnetic field sensor using adaptive filter to detect object |
| CN111344536B (en) * | 2017-11-08 | 2022-09-13 | 罗伯特·博世有限公司 | Method for operating a magnetic field sensor and associated magnetic field sensor device |
| CN108776314A (en) * | 2018-04-18 | 2018-11-09 | 微传智能科技（常州）有限公司 | ASIC processing circuits, offset voltage and low-frequency noise removal circuit, threshold decision circuit |
| CN111948582A (en) * | 2019-05-14 | 2020-11-17 | 日本电产株式会社 | Electric motor |
| CN111948582B (en) * | 2019-05-14 | 2023-09-22 | 日本电产株式会社 | Motor with a motor housing having a motor housing with a motor housing |
Also Published As
| Publication number | Publication date |
|---|---|
| CN205982595U (en) | 2017-02-22 |
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