BR102016018239A2 - magnetic sensor, integrated circuit for a magnetic sensor, and motor assembly - Google Patents

Abstract

“Magnetic sensor, integrated circuit for a magnetic sensor, and motor assembly” The present teaching refers to a magnetic sensor comprising an input port to be connected to an external power supply, a magnetic field detection circuit configured for generate a magnetic detection signal, an output control circuit configured to control the operation of the magnetic sensor in response to the magnetic detection signal, and an output port. The magnetic field sensing circuit includes a magnetic sensing element configured to detect an external magnetic field and produce a sensing signal, a signal processing element configured to amplify the sensing signal and remove sensing signal interference to generate a signal. and an analog-to-digital conversion element configured to convert the processed detection signal to a magnetic detection signal, and the output control circuit is configured to control the magnetic sensor to operate on at least one of a first. state and a second state in response to at least the magnetic detection signal.

Description

“MAGNETIC SENSOR, INTEGRATED CIRCUIT FOR A MAGNETIC SENSOR, AND ENGINE ASSEMBLY”

1. TECHNICAL FIELD

The present teaching relates to a field of circuit technology. In particular, the present teaching relates to a magnetic sensor. The present teaching further relates to an actuator for a permanent magnetic motor.

2. DISCUSSION OF TECHNICAL BACKGROUND

[002] Magnetic sensors are widely applied in modern industries and electronics to induce a magnetic field strength to measure physical parameters such as current, position and direction. The motor is an important field of application of the magnetic sensor. The magnetic sensor can serve as a position sensor of the rotor magnetic pole in the motor.

[003] In general, the magnetic sensor can only produce a magnetic field detection signal. However, the magnetic field detection signal is weak and mixed with magnetic sensor shift; It is difficult to obtain an accurate magnetic field detection signal.

SUMMARY

[004] This teaching provides a magnetic sensor and its application (s). According to one embodiment of the present teaching, a magnetic sensor comprises an input port to be connected to an external power supply; a magnetic field detection circuit configured to generate a magnetic detection signal; an output control circuit configured to control the operation of the magnetic sensor in response to the magnetic detection signal; and an output port, wherein the magnetic field detection circuit includes a magnetic sensing element configured to detect an external magnetic field and produce a sensing signal, a signal processing element configured to amplify the sensing signal and remove sensing signal interference to generate processed sensing signal, and a conversion element configured to convert the processed sensing signal to the magnetic sensing signal, which is used to control the magnetic sensor to operate in at least one of a first state and a second state in response to at least the magnetic sensing signal, wherein in the first state a load current passes from the output port outside the magnetic sensor, and in the second state a load current passes from the forum to the magnetic sensor output port.

In some embodiments, the detection signal includes a magnetic field signal and a bypass signal, and the signal processing element comprises a first periodic switch configured to separate the detection signal into the bypass signal and the signal from the magnetic field corresponding to a periodic interrupt frequency and a baseband frequency, respectively, a periodic interrupt amplifier configured to amplify the shift signal and the magnetic field signal and switch the amplified shift signal and the amplified magnetic field signal for the periodic interrupt frequency and the baseband frequency, respectively, and a filter circuit configured to filter the deviation signal at the periodic interrupt frequency.

In some embodiments, the periodic interrupt amplifier comprises a first amplifier and a second periodic switch, wherein the first amplifier is configured to perform first stage amplification on the shift signal and magnetic field signal from the first periodic switch. to generate the amplified shift signal and the amplified magnetic field signal, respectively, and the second periodic switch is configured to switch the amplified shift signal and the amplified magnetic field signal to the periodic interrupt frequency and baseband frequency. respectively.

In some embodiments, the first amplifier includes a cascaded folded amplifier.

In some embodiments, the periodic interrupt amplifier further comprises a second amplifier connected in series to the second periodic switch, wherein the second amplifier is configured to perform second stage amplification on the amplified shift signal switched to the periodic interrupt frequency. and the amplified magnetic field signal switched to baseband frequency.

In some embodiments, the signal processing element further comprises a sampling and holding circuit coupled between the periodic interrupt amplifier and the filter circuit, wherein the sampling and holding circuit is configured to sample a first pair of differential signals during a first half and a second half of a clock cycle, respectively, and produce two pairs of differential signals sampled during the clock cycle.

In some embodiments, the filter circuit further comprises a first filter configured to compute a second differential signal pair based on the two sampled differential signal pairs.

In some embodiments, the filter circuit further comprises a second filter configured to further amplify the second differential signal pair, remove the offset signal, and generate a third differential signal pair.

In some embodiments, the conversion element comprises a first comparator configured to compare a determined output voltage based on the third pair of differential signals with a high voltage threshold; a second comparator configured to compare output voltage with a low voltage threshold; and a lockout logic circuit configured to produce a first voltage if the output voltage is greater than the high voltage threshold or a second voltage if the output voltage is less than the low voltage threshold, or maintain the output of the control element. conversion if the output voltage is between the low voltage threshold and the high voltage threshold, where the high voltage threshold and the low voltage threshold are determined based on the differential voltage reference pair, where the first comparator and the second comparator takes a third pair of differential signals from the filter circuit and a pair of differential voltage references as inputs.

In some embodiments, the locking logic circuit is configured to produce a first voltage if a magnetic field strength reaches a pre-set working point or a second voltage if a magnetic field strength does not reach a pre-set release point. -stablished, or maintain the output of the conversion element if the magnetic field strength is between the preset release point and the preset work point.

In some embodiments, the magnetic sensor further comprises a rectifying circuit coupled with the input port and configured to provide a voltage supply to the magnetic field detection circuit, and an output control circuit configured to control the sensor. operating at least one of the first state and the second state based on the magnetic sensing signal, wherein the output control circuit comprises a first switch coupled with the output port to form a first current path that allows the load current passes from the output port outside the auto switch in the first state; and a second switch coupled with the output port to form a second current path that allows the load current to pass from outside the magnetic sensor to the output port in the second state, wherein the first and second switches operate on the basis of magnetic detection signal to selectively turn on the first and second current paths.

In some embodiments, wherein the first switch is a diode and the second switch is both a diode and a transistor.

According to another embodiment of the present teaching, an integrated circuit for a magnetic sensor comprises an input port to be connected to an external power supply; an exit door; and a magnetic field detection circuit configured to generate a magnetic detection signal and comprises a magnetic sensing element configured to detect an external magnetic field and produce a detection signal, wherein the detection signal includes a magnetic field signal and a bypass signal, a signal processing element configured to amplify the sensing signal and remove interference to generate a processed sensing signal, and a conversion element configured to convert the processed sensing signal to the magnetic sensing signal, which is used to control the magnetic sensor to operate in at least one of a first state and a second state in response to at least the magnetic sensing signal, wherein the signal processing element comprises a first periodic switch configured to separate the sensing signal on a magnetic field signal and a deviation signal corresponding to a the periodic interruption frequency and a baseband frequency, respectively; a periodic interrupt amplifier configured to separately amplify the magnetic field signal and the deviation signal and switch the amplified deviation signal and the amplified magnetic field signal to the periodic interrupt frequency and baseband frequency, respectively, and a filter circuit configured to remove the bypass signal that has been switched to the periodic interrupt frequency.

According to another embodiment of the present teaching, a motor assembly comprises a motor coupled with an external power supply that provides alternating current (AC) power to the motor; a magnetic sensor configured to detect a magnetic field generated by the motor; and a bidirectional switch configured to control the motor based on a magnetic sensor operating state determined based on the detected magnetic field, wherein the magnetic sensor comprises a magnetic field detection circuit configured to detect the magnetic field and generate a signal from magnetic detection based on the detected magnetic field; and an output control circuit configured to control, based on the magnetic sensing signal, the magnetic sensor to operate in at least one of a first state and a second state in response to at least the magnetic sensing signal, wherein in the In the first state, current passes from outside the magnetic sensor to the magnetic sensor, and in the second state, current passes from the magnetic sensor out of the magnetic sensor.

BRIEF DESCRIPTION OF DRAWINGS

The methods, systems and / or programming described herein are further described in terms of exemplary embodiments. These exemplary embodiments are described in detail with reference to the drawings. Such embodiments are exemplary non-limiting embodiments, wherein like reference numerals represent similar structures in the various views of the drawings, and wherein: FIG. 1 illustrates an exemplary schematic diagram of a magnetic sensor according to one embodiment of the present teaching; FIG. 2 illustrates an exemplary schematic diagram of signal processing element 1110 according to one embodiment of the present teaching; FIG. 3A illustrates an exemplary schematic diagram of a periodic interrupt amplifier 1204, according to one embodiment of the present teaching; FIG. 3B illustrates an exemplary schematic diagram of a periodic interrupt amplifier 1204 in accordance with another embodiment of the present teaching; FIG. 4 illustrates an exemplary schematic diagram of a magnetic sensor according to one embodiment of the present teaching; FIG. 5 illustrates an exemplary schematic diagram of a rectifier circuit 1402, according to one embodiment of the present teaching; FIG. 6 illustrates an exemplary circuit diagram of a Hall effect detector 1420 and the first periodic switch according to one embodiment of the present teaching; FIG. 7 illustrates exemplary signal outputs according to the circuit diagram of FIG. 6; FIG. 8 illustrates an exemplary filter circuit circuit diagram 1428 according to one embodiment of the present teaching; FIG. 9 illustrates an exemplary comparator circuit circuit diagram 1430 according to one embodiment of the present teaching; FIG. 10 illustrates an exemplary schematic diagram for determining polarity of the magnetic field; FIG. 11 illustrates exemplary signal outputs in a clock cycle; FIG. 12 illustrates an exemplary circuit diagram of output control circuit 1406, according to one embodiment of the present teaching; FIG. 13 illustrates an exemplary circuit diagram of the output control circuit according to another embodiment of the present teaching; FIG. 14 illustrates an exemplary circuit diagram of the output control circuit according to another embodiment of the present teaching; FIG. 15 illustrates an exemplary schematic diagram of a 2500 motor incorporating a magnetic sensor constructed in accordance with the present teaching; and FIG. 16 illustrates an exemplary schematic diagram of a synchronous motor 2600 incorporating a magnetic sensor constructed in accordance with the present teaching.

DETAILED DESCRIPTION

In the following detailed description, numerous specific details are presented by way of examples to provide a complete understanding of the teachings described. However, it should be apparent to those skilled in the art that the present teachings can be practiced without such details. In other instances, well-known methods, procedures, systems, components, and / or circuit systems have been described at a relatively high level, without detail, to avoid unnecessarily obscuring aspects of the present teachings.

In the descriptive report and claims, terms may have meanings with suggested or implied nuances in context beyond the explicitly stated meaning. Similarly, the expression "in one embodiment / example" as used herein does not necessarily refer to the same embodiment and the expression "in another embodiment / example" as used herein does not necessarily refer to a different embodiment. For example, the claimed subject matter is intended to include combinations of exemplary embodiments in whole or in part.

In general, terminology can be understood at least in part from use in context. For example, terms such as "and", "or", or "and / or" as used herein may include a variety of meanings that may depend at least in part on the context in which such terms are used. Typically, “or”, if used to associate a list, such as A, B, or C, shall mean A, B, and C, used herein in the inclusive sense, as well as A, B, or C, used herein exclusively. In addition, the expression "one or more" as used herein, depending at least in part on the context, may be used to describe any feature, structure, or feature in a singular sense, or may be used to describe combinations of features. , structures or features in a plural sense. Similarly, terms such as "one", "one" or "o", "a", again, may be understood to transfer a singular use or to transfer a plural use, depending at least in part on the context. In addition, the term "based on" may be understood to not necessarily transfer an exclusive set of factors and may instead allow additional factors not necessarily expressly described, again depending at least in part of the context.

The magnetic sensor in the present teaching employs at least one cascaded double amplifier. The cascade folded amplifier can efficiently amplify input signals that are too small to have a large gain. In addition, the cascaded double amplifier is configured with excellent frequency characteristics and is capable of processing expanded signals over a very wide frequency range. Additionally, the magnetic sensor in the present teaching can be directly connected to the municipal AC power supply without the need for additional A / D conversion equipment. Therefore, the present teaching facilitates the implementation of the magnetic sensor in various fields. Additionally, the magnetic field detection circuit can effectively amplify the detected magnetic field signal, regulate voltage and filter out interference signals. Therefore, the magnetic sensor can generate more accurate signal with respect to the polarity of the external magnetic field to control the operation of the electric rotor.

Additional unpublished resources will be presented in part in the following description, and in part will be apparent to those skilled in the art upon examination below and the accompanying drawings, or may be learned by producing or operating the examples. The unpublished resources of these teachings can be designed and achieved by practicing or using various aspects of the methodologies, instrumentalities, and combinations presented in the detailed examples discussed below. The magnetic sensor, the signal processing method implemented in the magnetic sensor, and the motor using the magnetic sensor and signal processing method described hereinafter may be achieved using any circuit technology known to those skilled in the art including, but not limited to integrated circuit and other circuit implementations.

FIG. 1 illustrates an exemplary schematic diagram of a magnetic sensor according to one embodiment of the present teaching. The magnetic sensor according to this embodiment comprises an input port 1102, a magnetic field sensing circuit 1104 and an output port 1106. Input port 1102 is configured to connect to an external power supply and provides power to the circuit. field detection sensor 1104. In some embodiments, the external power supply is a direct current (DC) power supply. In another embodiment, the external power supply is an alternating current (AC) power supply. The magnetic field detection circuit 1104 is configured to detect an external magnetic field and generate a magnetic field detection signal. The magnetic field detection signal 1106 is then applied to control the operating state of the magnetic sensor and motor or any electrical equipment using the magnetic sensor.

Magnetic field sensing circuitry 1104 may comprise a magnetic sensing element 1108, a signal processing element 1110, and a conversion element 1114. Magnetic sensing element 1108 is configured to sense the external magnetic field and produce a first sensing signal 1120. First sensing signal 1120 produced by magnetic sensing element 1108 includes at least one magnetic field signal and a deviation signal. The magnetic field signal indicates an actual magnetic voltage signal associated with the external magnetic field that is sensed by the magnetic sensing element 1108. The deviation signal is a bias signal inherited in the magnetic sensing element 1108.

Since the actual magnetic voltage signal may be interfered with by at least the inherited bias signal, the signal processing element 1110 is configured to amplify the first received detection signal 1120, removing the interference signals from the first signal. detection 1120, and generating a second detection signal 1122. In some embodiments, the signal processing element 1110 may comprise at least one cascaded amplifier 1112.

The conversion element 1114 is configured to convert the second detection signal 1122 to magnetic field detection signal and to produce magnetic field detection signal via output port 1106. In some embodiments, the detection signal of Magnetic field is a switching detection signal.

FIG. 2 illustrates an exemplary schematic diagram of signal processing element 1110 according to one embodiment of the present teaching. Signal processing element 1110 according to FIG. 1 comprises a first periodic switch (Z1) 1202 and a first periodic interrupt amplifier (IA) 1204. The first periodic switch 1202 is configured to separate the shift signal and magnetic field signal that will be carried at a frequency of the baseband. and a periodic interruption frequency, respectively. The first periodic interrupt amplifier 1204 is configured to amplify the shift signal and magnetic field signal and switch the amplified shift signal and magnetic field signal to the periodic interrupt frequency and baseband frequency, respectively, to streaming. In some embodiments, the periodic interrupt frequency is greater than 100KHz, and the baseband frequency is less than 200Hz.

In some embodiments, when the external power supply is an AC power supply, the frequency of the baseband is proportional to the frequency of the AC power supply. In some embodiments, the baseband frequency is twice the frequency of the AC power supply.

In some embodiments, signal processing element 1110 may further comprise a low pass filter (LPF) 1206 configured to remove the offset signal transmitted via the periodic interrupt frequency.

In these embodiments, each of the inputs and outputs of the first periodic switch (Z1) 1202, first periodic interrupt amplifier (IA) 1204, and low pass filter (LPF) 1206 is illustrated in a single line. It will be appreciated that FIG. 2 has illustrative purpose. The present teaching should not be limiting. Each of the inputs and outputs of the first periodic switch (Z1) 1202, first periodic interrupt amplifier (IA) 1204, and low pass filter (LPF) 1206 may be one or more input / output signals. In some embodiments, each of the inputs and outputs of the first periodic switch (Z1) 1202, first periodic interrupt amplifier (IA) 1204, and low pass filter (LPF) 1206 includes one or more differential signal pairs.

FIG. 3A illustrates an exemplary schematic diagram of a periodic interrupt amplifier 1204, according to one embodiment of the present teaching. First periodic interrupt amplifier (IA) 1204 in FIG. 2 comprises a first amplifier (Al) 1302 and a second periodic switch (Z2) 1304. The first amplifier (Al) 1302 is configured to perform an amplification of the first shift signal and magnetic field signal of the first periodic switch ( Z1) 1202. In some embodiments, the first amplifier (Al) 1302 is implemented using at least one cascade folded amplifier such as 1112. The second periodic switch (Z2) 1304 is configured to switch the amplified shift signal and the signal from the magnetic field for the periodic interruption frequency and the base band frequency for transmission, respectively.

FIG. 3B illustrates an exemplary schematic diagram of a periodic interrupt amplifier 1204 in accordance with another embodiment of the present teaching. According to the illustrated embodiment, the first periodic interrupt amplifier (IA) 1204 in FIG. 2 may comprise a second amplifier (A2) 1306 in addition to the first amplifier (Al) 1302 and second periodic switch (Z2) 1304. The second amplifier (A2) 1306 is configured to further perform a second stage amplification of the bypass signal and magnetic field signal from the second periodic switch (Z2) 1304. In some embodiments, the second periodic switch (Z2) 1304 is implemented based on a single stage amplifier.

It will be appreciated that the connections of the first amplifier (Al) 1302, the second periodic switch (Z2) 1304, and the second amplifier (A2) 1306 in FIG. 3B have illustrative purposes. The present teaching should not be limiting. In some embodiments, the second amplifier (A2) 1306 may be disposed between the first amplifier (Al) 1302 and the second periodic switch (Z2) 1304.

FIG. 4 illustrates an exemplary schematic diagram of a magnetic sensor according to another embodiment of the present teaching. The magnetic sensor according to the illustrated embodiment comprises an input port 1408, a rectifier circuit 1402, a magnetic field detection circuit 1404, output control circuit 1406, and an output port 1410. Input port 1408 in this One embodiment comprises a pair of input ports 1408A and 1408B that connect to the external power supply. In some embodiments, input port 1408 may connect to the external power supply in series. In also other embodiments, input port 1408 may connect to the external power supply in parallel.

Rectifier circuit 1402 may be implemented based on a full-wave rectifier bridge and a voltage regulator (not shown). A full-wave rectifier bridge can be configured to convert an AC signal from the AC power supply to a DC signal. A voltage regulator can be configured to regulate the DC signal within a preset range. Rectifier circuit 1402 supplies the dc signal regulated to magnetic field detection circuit 1404 and output control circuit 1406.

In this illustrated embodiment, the magnetic field detection circuit 1404 comprises a Hall effect detector 1420, a first periodic switch 1422, a first periodic interrupt amplifier 1424, a sampling and holding circuit 1426, a filter circuit 1428 , and a comparator circuit 1430. Hall effect detector 1420 connects to the rectifier circuit 1402 to detect magnetic field signal and produce the detected magnetic field signal for the first periodic switch 1422. The first periodic switch 1422 is configured to perform the same. functions of the first periodic switch 1202 shown in FIG. 2. The first periodic switch 1422 sends a first pair of differential signals {Pl, Nl} to the first periodic interrupt amplifier 1424.

First periodic interrupt amplifier 1424 may be implemented based on what is illustrated in FIG. 3B. Thus, the first periodic interrupt amplifier 1424 comprises a first amplifier (Al) 1302, a second periodic switch (Z2) 1304, and a second amplifier (A2) 1306. The first amplifier (Al) 1302 performs first stage amplification of the first pair received differential signals {Pl, Nl}. The second periodic switch (Z2) 1304 is configured to directly produce the amplified differential signal {Pl, Nl} in a first half of a clock cycle, and to switch the amplified differential signal (Pl, Nl} to produce in a second half of the clock. The second periodic switch (Z2) 1304 produces a second pair of differential signals {P2, Ν2} The second pair of differential signals {P2, N2} can be further amplified by the second amplifier (A2) 1306 before being transferred to sampling and holding circuit 1426.

Sampling and holding circuit 1426 is configured to sample the second pair of amplified differential signals {P2, N2} produced by the first periodic interrupt amplifier 1424 in FIG. 4 during the first half and second half of the clock cycle, respectively. Outputs from sampling and holding circuit 1426 comprise two pairs of differential signals {P2A, N2A} and {P2B, N2B}, where the pair of {P2A, N2A} is produced during the first half of the clock cycle and the pair of { P2B, N2B} is produced during the second half of the clock cycle.

Filter circuit 1428 is configured to remove the bypass signal from the two differential signal pairs {P2A, N2A} and {P2B, N2B}, and to amplify the differential signals {P2A, N2A} and {P2B, N2B}, and producing a third differential signal {P3, N3} for the comparator circuit 1430.

Comparator circuit 1430 is configured to compare the third pair of differential signals {P3, N3} to a pair of reference voltage signals, and to determine the polarity of the external magnetic field based on the comparison results. The comparator circuit 1430 generates a magnetic field detection signal indicating the determined polarity of the external magnetic field and outputs it to the output control circuit 1406. In some embodiments, the magnetic field detection signal is a magnetic field detection signal. magnetic field switching.

Output control circuit 1406 is configured to control the magnetic sensor to operate in a state in response to the determined polarity of the external magnetic field. The magnetic sensor can operate in a plurality of states. For example, a first state may correspond to a scenario in which a load current passes from inside the magnetic sensor through the output port 1410, and a second state may correspond to a scenario in which a load current passes from out into the magnetic sensor via output port 1410. In some embodiments, the magnetic sensor may operate in a third state in which no current passes through output port 1410.

The actual signal of magnetic voltage is usually very small. For example, it is usually less than 1 millivolt. However, the deviation signal generated by the Hall 1420 effect detector is often higher, say, nearly 10 millivolts. The present teaching aims to remove the deviation signal and amplifies the actual magnetic voltage signal so that the actual magnetic voltage signal at an operable level can be supplied to a motor or any electrical equipment using the magnetic sensor. In some embodiments, the voltage supply to magnetic field detection circuit 1404 is at the level of about 2.5V. When the detected signal produced by the Hall effect detector 1420 passes through the first periodic switch 1422, the first periodic interrupt amplifier 1424, sampling and holding circuit 1426, and filter circuit 1428, the detected signal may be amplified 1,000 to 2,000 times. original feed gain, preferably some intermediate value such as 1,600 times the original feed gain. As a result, the actual detected magnetic voltage signal is amplified to be approximately half of the voltage level supplied to the magnetic field detection circuit 1404. In some embodiments, the first periodic interrupt amplifier 1424 is configured to achieve greater gain. that of the filter circuit 1428. For example, the gain achieved by the first periodic interrupt amplifier 1424 may be 50 while the gain achieved by the filter circuit 1428 is 32.

FIG. 5 illustrates an exemplary schematic diagram of a rectifier circuit 1402, according to one embodiment of the present teaching. According to the embodiment illustrated in FIG. 5, a full-wave rectifier bridge is employed to implement rectifier circuit 1402, which comprises a first diode 1502, a second diode 1504, a third diode 1506, and a fourth diode 1508; and a voltage regulator comprises a regulator diode 1520. The first diode 1502 and the second diode 1504 are connected in series. Third diode 1506 and fourth diode 1508 are also connected in series. First diode cathode 1502 and second diode anode 1504 are configured to connect to input port 1408A, which supplies VAC + voltage. Third diode cathode 1506 and fourth diode anode 1508 are configured to connect to input port 1408B, which supplies VAC- voltage. Regulator diode anode 1502 is configured to connect to the anode of the first diode 1502 and the third diode 1506, which is additionally connected to ground. Regulator diode cathode 1520 is connected to second diode cathode 1504 and fourth diode 1508 connecting both at voltage VDD.

FIG. 6 illustrates an exemplary circuit diagram of a Hall effect detector 1420 and the first periodic switch according to one embodiment of the present teaching. According to the illustrated embodiment, Hall effect detector 1420 and first periodic switch 1422 are integrated as a single circuit in FIG. 6. Hall effect detector 1420 comprises a Hall detection circuit board with four connecting ports 1602, 1604, 1606 and 1608. Connecting ports 1602 and 1606 are arranged opposite each other and connecting ports 1604 and 1608 are arranged opposite. each other. First periodic switch 1422 comprises four switches 1610, 1612, 1614, and 1616. Switch 1610 controls connection ports 1602 and 1608 to connect to the VCC power supply, and switch 1612 controls connection ports 1604 and 1606 to connect high ground. Switch 1614 controls connection ports 1602 and 1608 to produce highly differential signal P1, and switch 1616 controls connection ports 1604 and 1606 to produce highly differential signal N1. In some embodiments, Hall effect detector 1420 and first periodic switch 1422 are configured such that when one of the connecting ports 1602 and 1608 connects to the VDC power supply, the other of the connecting ports 1602 and 1608 produces differential signal Pl. However, when one of the 1604 and 1606 connection ports is grounded, the other of the 1604 and 1606 connection ports produces differential signal Nl. For example, when connecting port 1602 connects to the VDC power supply and connecting port 1606 connects to ground, connecting ports 1608 and 1604 produce the differential signal pair {Pl, Nl}. Alternatively, when connection port 1608 connects to the VDC power supply and connection port 1604 connects to ground, connection ports 1602 and 1606 produce the first pair of differential signals {Pl, Nl}.

In some embodiments, the VDC power supply may be a constant voltage source achieved by dropping and regulating voltage at the output of the rectifier circuit 1402. In other embodiments, the VDC power supply may be a constant voltage source. constant current

In some embodiments, each of the switches 1610, 1612, 1614 and 1616 comprises a pair of switches configured to be high voltage conduction or low voltage conduction. Each of such pairs of switches may be controlled by a pair of complementary clock signals. By supplying two complementary clock signal pairs at the same frequency as switches 1610, 1612, 1614, and 1616, respectively, Hall effect detector 1420 and first periodic switch 1422 can generate the first differential signal pair {Pl, Nl}.

FIG. 7 illustrates exemplary signal outputs according to the circuit diagram of FIG. 6. Signal CK1 denotes a clock signal. Vos signal denotes the deviation signal that is inherited in the Hall effect detector 1420. In general, the Vos signal depends on the physical characteristics of the Hall effect detector 1420. Vin and -Vin denote the actual voltage signal of the magnetic field produced by the first one. periodic switch 1422 during the first half and second half of clock signal CK1, respectively. The actual magnetic field voltage signal is an ideal magnetic field voltage signal associated with the external magnetic field without interference caused by the deviation signal. During the first half and second half of the clock signal CK1, the actual magnetic field voltage signals produced by the first periodic switch 1422 have the same amplitude and opposite polarities. Vout denotes the output of the first periodic switch 1422, which is the actual voltage signal of the overlapping Vin or -Vin magnetic field or in combination with the deviation signal Vos. First periodic switch 1422 separates the actual voltage signal from the magnetic field Vin or -Vin and deviation signal Vos, and switches them to a periodic break frequency and a baseband frequency, respectively. In some embodiments, the periodic interrupt frequency is the clock signal frequency CK1 and the baseband frequency is the polarity change frequency of the external magnetic field.

FIG. 8 illustrates an exemplary filter circuit circuit diagram 1428, according to one embodiment of the present teaching. Filter circuit 1428 illustrated in FIG. 4 may comprise a first filter (F1) 1802 and a second filter (F2) 1804. The first filter (F1) 1802 is configured to apply a first stage addition to each of the two signal pairs {P2A, P2B} and { N2A, N2B} which are produced by sampling and holding circuit 1426 to remove the bypass signals. The first filter (F1) 1802 may be further configured to perform first stage gain amplification on the signals after first stage addition processing. The second filter (F2) 1804 is configured to apply a second stage addition amplification and / or second stage gain on the output signals of the first filter (F1) 1802 and generate the third pair of differential signals {P3, N3}. The gain of the first filter (F1) 1802 may be set to be less than the gain of the second filter (F2) 1804. For example, the gain of the first filter (F1) 1802 is 4 and the gain of the second filter (F2) 1804. it's 8

It should be noted that the above-described filter circuit diagram 1428 is for illustrative purposes only. The present teaching should not be limiting. Filter circuit 1428 may comprise more or less filters than shown in FIG. 8. In some embodiments, filter circuit 1428 may comprise only one filter. However, in this situation, the only filter may have to be configured with a high resistance in order to achieve a better gain.

FIG. 9 illustrates an exemplary comparator circuit circuit diagram 1430 according to one embodiment of the present teaching. The comparator circuit 1430 of FIG. 4 may perform the same function as the A / D conversion element 1114 of FIG. 1. In this embodiment, comparator circuit 1430 may be a delay comparator including a first comparator (Cl) 1902, a second comparator (C2) 1904, and a locking logic circuit (S) 1906. The input to the first comparator (Cl ) 1902 includes the third differential signal pair {P3, N3} and a reference voltage signal pair {Vh, VI}, where Vh is a high voltage signal and VI is a low voltage signal. The input on the second comparator (C2) 1904 includes the same signal pairs that are fed into the first comparator (Cl) 1902 except that the reference voltage signal pair {Vh, VI} is connected at opposite polarities. The first comparator (Cl) 1902 is configured to compute an output voltage VI of filter 1408, where V1 = P3-N3, and a high voltage threshold Rh, where Rh = Vh-Vl. The first comparator (Cl) 1902 compares the output voltage VI with the high voltage threshold Rh. When Vl> Rh, first comparator (Cl) 1902 produces high, and when Vl <Rh, first comparator (Cl) 1902 produces low. The second comparator (C2) 1904 is configured to compare filter output voltage VI of filter 1408 with a low voltage threshold R1, where R1 = V1-Vh. When V1> R1, the second comparator (C2) 1904 produces high, and when V1 <R1, the second comparator (C2) 1904 produces low. Since Rh is greater than R1, when Vl> Rh, which means that Vl> Rl, both the first comparator (Cl) 1902 and the second comparator (C2) 1904 produce high. When V1 <R1, which means that V1 <Rh, both the first comparator (Cl) 1902 and the second comparator (C2) 1904 produce low. When R / <VI <Rh, the first comparator (C1) 1902 produces low and the second comparator (C2) 1904 produces high. The results of comparing the first comparator (Cl) 1902 and the second comparator (C2) 1904 are transmitted to the locking logic circuit (S) 1906. The locking logic circuit (S) 1906 is configured to generate a voltage signal with based on the results of the comparison. The voltage signal is additionally transmitted to output control circuit 1406 to control the operating state of the magnetic sensor. Details of how the locking logic circuit (S) 1906 generates a voltage signal based on the comparison results are described below.

FIG. 10 illustrates an exemplary schematic diagram for determining magnetic field polarity according to one embodiment of the present teaching. When the lockout logic circuit 1906 receives the results of comparing the first comparator (Cl) 1902 and the second comparator (C2) 1904, which indicate that the filter circuit output voltage 1428 VI is greater than Rh, the latching logic circuit (S) 1906 generates a first signal indicating a change to reduce the current state. When the lockout logic circuit 1906 receives the results of comparing the first comparator (Cl) 1902 and the second comparator (C2) 1904, which indicate that the filter circuit output voltage 1428 is less than R1, the circuit Locking logic (S) 1906 generates a second signal indicating a change to power the current state. When the lockout logic circuit 1906 receives the results of comparing the first comparator (Cl) 1902 and the second comparator (C2) 1904, which indicate that the filter circuit output voltage 1428 VI satisfies R1 <V1 <Rh , latching logic circuit (S) 1906 generates a third signal indicating no change in state. In some embodiments, the first voltage indicates that the external magnetic field has a first polarity, and the second voltage indicates that the external magnetic field has a second polarity.

FIG. 10 illustrates that in some embodiments, when the magnetic field strength of the external magnetic field reaches a Bop workpoint, the comparator circuit 1430 generates the first signal, whereas when the magnetic field strength of the external magnetic field is below from a release point Brp, the comparator circuit 1430 generates the second signal. When the magnetic field strength of the external magnetic field is between the work point Bop and the release point Brp, the comparator circuit 1430 continues with the unchanged current output.

FIG. 11 illustrates exemplary clock cycle outputs according to one embodiment of the present teaching. As shown in FIG. 11 (A), the first differential signal pair {Pl, NI} is the output of the first periodic switch 1422, the second differential signal pair {P2, N2} is the output of the first periodic interrupt amplifier 1424, and the third differential signal pair {P3, N3} is the output of filter circuit 1428. {PIA, NI A) is a differential signal pair produced by the first periodic switch 1422 during the first half of the clock cycle, and {PIB, N1B ) is a pair of differential signals produced by the first periodic switch 1422 during the second half of the clock cycle. {P2A, N2A} is a pair of differential signals produced by the first periodic interrupt amplifier 1424 during the first half of the clock cycle, and {P2B, N2B} is a pair of differential signals produced by the first periodic interrupt amplifier 1424 during second half of the clock cycle.

As previously described, Vout denotes the output of the first periodic switch 1422, which is the actual voltage signal of the magnetic field Vin or - Vin overlaid by the deviation signal Vos. In another aspect, Vout denotes the difference between the first pair of differential signals {Pl, Nl}, where PI and NI have the same amplitude and opposite polarities. Therefore, PIA, PIB, NI A, and NI B are denoted by the following equations: (1) When first periodic interrupt amplifier 1424 in FIG. 4 implements the embodiment illustrated in FIG. 3B, the first periodic interrupt amplifier 1424 comprises a first amplifier (A1) 1302, a second periodic switch (Z2) 1304, and a second amplifier (A2) 1306. The first differential signal pair {Pl, Nl} is amplified at differential signals {Pl Nl '} after passing through the first amplifier (Al) 1302. {Pl Nl'} and their respective components during the first half and second half of the clock cycle are denoted by the following equations: (2) [0057] ] A denotes the amplification gain of the first amplifier (Al) 1302. Voff denotes the shift signal produced by the first amplifier (Al) 1302, which includes the shift signal generated by the Hall 1420 Vos effect detector and the shift signal generated. first amplifier (Al) 1302. For illustrative purposes, coefficients UM and Vi are ignored in the description hereinafter.

Since the second periodic switch (Z2) 1304 directly produces the amplified differential signal {Pl, NI} in the first half of a clock cycle, and commutably produces the amplified differential signal {Pl, NI} in the second half of the clock cycle. clock, the output of the second periodic switch (Z2) 1304 comprises two components in each half clock cycle. After passing through sampling and holding circuit 1426, the four components {P2A, P2B, N2A, N2B} denoted by the following equations are fed into filter circuit 1428. (3) Additionally, the third pair of differential signals { P3, N3} produced by filter circuit 1428 are denoted by the following equations: (4) As shown in the above equations, the shunt signals in the third pair of differential signals {P3, Ν3} are removed by filter circuit 1428. The third pair of differential signals {P3, N3} thus comprises only the actual voltage signal of the magnetic field.

FIG. 11 (B) shows that after the first periodic switch (e.g., 1202 in FIG. 2), the actual voltage signal of the magnetic field Vin and the offset signal Voff are separated at a periodic break frequency of 400 kHz and a baseband frequency of 100 Hz, respectively, where the periodic interruption frequency is the clock signal frequency. After the second periodic switch (e.g. 1304 in FIG. 3A, 3B), the actual magnetic field voltage signal Vin and the offset signal Voff are switched to the baseband frequency and the periodic interrupt frequency, respectively. . Then, after the filter circuit (e.g. 1206 in FIG. 2), the offset signal Voff is filtered. When the magnetic sensor is implemented to control a synchronous motor, the external magnetic field may be a permanent magnetic motor field where the frequency of polarity change is twice the frequency of the AC power supply. If the synchronous motor is provided with the 50 Hz or 60 Hz municipal AC power supply, the frequency of the baseband is 100 Hz or 120 Hz. After passing through the multiple periodic switches and amplifiers, the actual field voltage signal The magnetic signal and the deviation signal are separated into a very wide frequency range. As such, the periodic interrupt amplifier implemented in the present teaching is configured to accommodate the very wide frequency range.

FIG. 12 illustrates an exemplary circuit diagram of output control circuit 1406, according to one embodiment of the present teaching. The output control circuit 1406 according to the illustrated embodiment comprises a first switch 2202 and a second switch 2204. The first switch 2202 is coupled with the output port 1410 to form a first current path, and the second switch 2204 is coupled with outlet port 1410 to form a second current path. Electric current passes through the first and second current paths in opposite directions. First switch 2202 and second switch 2204 are controlled by the magnetic sensing signal to be selectively connected. In some embodiments, the first switch 2202 is a transistor, and the second switch 2204 is both a diode and a transistor.

In some embodiments, the first switch 2202 is configured as low voltage and the second switch 2204 is configured as high voltage. The control ends of both the first switch 2202 and the second switch 2204 are connected to the output of the magnetic sensing circuit 1404. The output of the first switch 2202 and the input of the second switch 2204 are both connected to the output port 1410. The input of the first switch 2202 may be connected at a high voltage end 2206, for example, a DC power supply or the VDD output of the rectifier circuit 1402, and the output of the second switch 2204 may be connected at a low voltage end 2208, for example. example, a land. If the output of magnetic sensing circuit 1404 is a low voltage signal, the first switch 2202 is connected and the second switch 2204 is disconnected. Accordingly, a load current passes to the first switch 2202 from the high voltage end 2206 and exits through the output port 1410. If the output of the magnetic sensing circuit 1404 is a high voltage signal, the second switch 2204 is connected and the first switch 2202 is disconnected. Accordingly, a load current passes to the second switch 2204 from the output port 1410 and exits via the low voltage end 2208.

FIG. 13 illustrates an exemplary circuit diagram of the output control circuit according to another embodiment of the present teaching. The output control circuit 1406 according to the illustrated embodiment comprises first switch 2302 and second switch 2304. The first switch 2302 is configured as high voltage, and second switch 2304 is configured to be a one-way diode. The control end of the first switch 2302 and the cathode of the second switch 2304 are both connected to the output of the magnetic sensing circuit 1404. In some embodiments, the control end of the first switch 2302 is connected to the magnetic sensing circuit output 1404 by means of a resistor 2308. The input of the first switch 2302 may be connected to the output of the rectifier circuit 1402 (referring to FIG. 4). The first switch output 2302 and the second switch anode are both connected to output port 1410. Similar to the embodiment illustrated in FIG. 12, first switch 2302 is coupled with output port 1410 to form a first current path, and second switch 2304 is coupled with output port 1410 to form a second current path. Electric current passes through the first and second current paths in opposite directions. If the output of magnetic sensing circuit 1404 is a high voltage signal, the first switch 2302 is connected and the second switch 2304 is disconnected. Accordingly, a charge current passes to the first switch 2302 from the high voltage end 2306 and exits through the output port 1410. If the output of the magnetic sensing circuit 1404 is a low voltage signal, the second switch 2304 is connected and the first switch 2302 is disconnected. Accordingly, a load current passes to the second switch 2304 from the output port 1410.

FIG. 14 illustrates an exemplary circuit diagram of the output control circuit, according to also another embodiment of the present teaching. The output control circuit 1406 according to the illustrated embodiment comprises a one-way switch 2402 and a resistor 2404. The one-way switch 2402 is connected between the magnetic field detection circuit 1404 and the output port 1410 to form a first path. current, and resistor 2404 is connected between magnetic field detection circuit 1404 and output port 1410 to form a second current path, where electric current passes through the first and second current paths in opposite directions. If the output of the magnetic sensing circuit 1404 is a high voltage signal, the one-way switch 2402 is connected and a load current passes through the one-way switch 2402 from the magnetic field detection circuit's output 1404 to the output port 1410. If the output of magnetic sensing circuit 1404 is a low voltage signal, the one-way switch 2402 is disconnected and a load current passes through resistor 2404 from output port 1410 to magnetic field sensing circuit output 1404. .

The magnetic sensor in the present teaching can be directly connected to the municipal AC power supply without the need for additional A / D conversion equipment. Therefore, the present teaching facilitates the implementation of the magnetic sensor in various fields. Additionally, the magnetic field detection circuit can effectively amplify the detected magnetic field signal, regulate voltage and filter out interference signals. Therefore, the magnetic sensor can generate more accurate signal with respect to the polarity of the external magnetic field to control the operation of the electric rotor.

FIG. 15 illustrates an exemplary schematic diagram of a motor 2500 incorporating a magnetic sensor constructed in accordance with the present teaching. The motor may comprise an AC power supply 2502, a motor 2504, a magnetic sensor 2508, and a bidirectional switch 2510. In some embodiments, the motor 2500 may additionally comprise a voltage drop circuit 2506 configured to reduce the power level. 2502 AC power supply before supplying the 2508 magnetic sensor. The Output output of the 2508 magnetic sensor is electrically connected to a control end of the 2510 bidirectional switch.

In some embodiments, the magnetic sensor 2508 is configured to transfer a drive current to the bidirectional switch 2510 when the AC power supply 2502 operates at a positive half-cycle and when the magnetic field detection circuit 1404 on the sensor. Magnetic 2508 determines that the external magnetic field has a first polarity. Alternatively, output control circuit 1406 on magnetic sensor 2508 is configured to control magnetic sensor 2508 to transfer a drive current to bidirectional switch 2510 when AC power supply 2502 operates at a negative half cycle and circuit It detects that the external magnetic field has a second polarity opposite to the first polarity. Output control circuit 1406 on magnetic sensor 2508 is further configured to control magnetic sensor 2508 so as not to transfer a drive current to bidirectional switch 2510 when AC power supply 2502 operates at a negative half cycle and magnetic field detection 1404 therein determines that the external magnetic field has a first polarity, or when the AC power supply 2502 operates at a positive half-cycle and magnetic field detection circuit 1404 determines that the external magnetic field has a second polarity.

In embodiments where the magnetic sensor 2508 uses a rectifier circuit as illustrated in FIG. 5 and an output control circuit as illustrated in FIG. 12, the input of the first switch 2202 of FIG. 12 is configured to connect to the VDD voltage output of the bridge full wave rectifier of FIG. 5, and the output of the second switch 2204 is configured to connect a ground. When AC power supply 2502 operates at a positive half-cycle and magnetic field detection circuit 1404 produces a low voltage, the first switch 2202 is connected and the second switch is disconnected, an electric current passes in one direction through the AC power supply 2502, motor 2504, VAC +, magnetic sensor 2508, and bidirectional switch 2510. On magnetic sensor 2508, the electric current goes through the voltage output of the bridge full-wave rectifier and the first switch 2202. In some embodiments , the electric current goes through the voltage drop circuit 2506 before the magnetic sensor 2508. When the AC power supply 2502 operates at a negative half cycle and the magnetic field detection circuit 1404 produces a high voltage, the first switch 2202 is disconnected and the second switch is connected, an electrical current flows in the opposite direction through the AC 2502 power supply, bidirectional switch 2510, magnetic sensor 2508, and motor 2504. On magnetic sensor 2508, electrical current passes through the second switch 2204, bridge full-wave rectifier ground output, first diode 1502, and VAC +. When AC power supply 2502 operates at a positive half-cycle and magnetic field detection circuit 1404 produces a high voltage, or when AC power supply 2502 operates at a negative half-cycle and field detection circuit 1404 produces a low voltage, the first switch 2202 and second switch 2204 are both disconnected. Consequently, there is no drive current passed through the output of the magnetic sensor 2508.

FIG. 16 illustrates an exemplary schematic diagram of a synchronous motor 2600 incorporating a magnetic sensor constructed in accordance with the present teaching. The synchronous motor 2600 comprises a stator and a rotor 2602 configured to rotate relative to the stator. The stator comprises a stator core 2604 and a stator coil 2612 configured to be wound around the stator core 2604. The stator core 2604 can be made of any soft magnetic material such as iron, cast iron, electric steel, silicon. , etc. The 2602 rotor is configured to rotate at a constant speed of 60 f / p (ie, revolutions per minute, rpm) during connection to a series AC power supply, where the frequency of the AC & p power supply is number of pole pairs on rotor 2602.

The stator core 2604 is configured with a pair of opposite pole portions 2608A and 2608B. Each of the pair of opposite pole portions (2608A, 2608B) has a pole arc surface, for example, 2610A and 2610B. The rotor surface 2602 opposes the pole arc surfaces (2610A, 2610B) and forms an air gap 2606 in between. In some embodiments, air clearance 2606 between rotor 2602 and stator is basically uniform with very little uneven air clearance area. In some embodiments, each of the pole surfaces (2610A, 2610B) is additionally configured with a starting notch, for example, 2614. The pole arc surfaces (2610A, 2610B) are concentric with rotor 2602 except areas starting slot. The configuration of the starting notches forms an internally uniform magnetic field. In addition, the configuration of the starting notches ensures that when rotor 2602 is static, an SI pole of rotor 2602 is inclined at an angle to a central pole S2 of pole portions 2608A and 2608B. Such a configuration allows rotor 2602 to have a starting torque each time the engine is started. In this embodiment, the SI pole of rotor 2602 is a separation boundary between two magnetic poles of rotor 2602, the central pole S2 passes through opposite pole portions 2608A and 2608B in the center. The stator and rotor 2602 are both configured with two magnetic poles.

The output control circuit 1406 according to the present teaching controls the bidirectional switch 2510 to toggle the state between connection and disconnection based on the AC 2502 power supply polarity and the external magnetic field polarity, and additionally controls the drive state of the 2612 stator coil. As such, the magnetic field generated by the stator can coordinate with the position of the rotor magnetic field 2602 to drive the rotor to rotate in one direction and thus ensures that the motor has a constant direction of rotation each time the engine is started.

Accordingly, an application apparatus is additionally provided according to one embodiment of the present disclosure. The application apparatus includes an ac motor driven motor, a bi-directional conductive switch electrically connected to the series electric motor, and the integrated circuit magnetic sensor according to any of the above embodiments. An integrated circuit magnetic output sensor port is electrically connected to a control end of the bidirectional conductive switch. Optionally, the application apparatus may be a pump, a ventilator, a household appliance, a vehicle and the like, where the household appliance, for example, may be a washing machine, a dishwasher, an extractor fan, a fan of exhaustion and the like.

[0074] It should be noted that the above examples have illustrative purposes. The present teaching should not be limiting. Stator and rotor 2602 may be configured with different magnetic poles, such as four or six magnetic poles. Moreover, the stator and rotor 2602 may have different magnetic poles relative to each other.

Those skilled in the art will appreciate that the present teachings are subject to a variety of modifications and / or improvements. For example, while deploying multiple of the above components can be designed on one hardware device, it can also be implemented as a software-only solution - for example, an installation on an existing server. In addition, host units and client nodes as described herein may be implemented as a firmware, firmware / software combination, firmware / hardware combination, or a hardware / firmware / software combination.

Although the foregoing has described what is considered the best mode and / or other examples, it is understood that various modifications may be made to them and that the subject matter described herein may be implemented in various forms and examples, and that These teachings can be applied in a number of applications, only some of which have been described here. It is intended by the following claims to claim any or all applications, modifications, and variations that fall within the true scope of the present teachings.

Claims (11)

1. Magnetic sensor, characterized in that it comprises: an input port to be connected to an external power supply; a magnetic field detection circuit configured to generate a magnetic detection signal; an output control circuit configured to control the operation of the magnetic sensor in response to the magnetic detection signal; and an output port, wherein the magnetic field sensing circuit includes: a magnetic sensing element configured to sense an external magnetic field and producing a sensing signal, a signal processing element configured to amplify the sensing signal, and remove interference from the detection signal to generate processed detection signal, and a conversion element configured to convert the processed detection signal to the magnetic detection signal, which is used to control the magnetic sensor to operate in at least one of a first state. and a second state in response to at least the magnetic sensing signal, wherein: in the first state, a charging current passes from the output port outside the magnetic sensor, and in the second state, a charging current passes from forum to the magnetic sensor output port. Magnetic sensor according to claim 1, characterized in that the detection signal includes a magnetic field signal and a deviation signal, and the signal processing element comprises: a first periodic switch configured to separate the signal sensing signals in the shift signal and magnetic field signal corresponding to a periodic interrupt frequency and a baseband frequency, respectively, a periodic interrupt amplifier configured to amplify the shift signal and magnetic field signal and to switch the signal deviation and the amplified magnetic field signal for the periodic interruption frequency and the baseband frequency, respectively, and a filter circuit configured to filter the deviation signal at the periodic interruption frequency. Magnetic sensor according to claim 2, characterized in that the periodic interrupt amplifier comprises: a first amplifier; and a second periodic switch, wherein: the first amplifier includes a cascade folded amplifier for performing first stage amplification on the shift signal and magnetic field signal from the first periodic switch to generate the amplified shift signal and amplified magnetic field, respectively, and the second periodic switch is configured to switch the amplified shift signal and the amplified magnetic field signal to the periodic interrupt frequency and baseband frequency, respectively. Magnetic sensor according to claim 3, characterized in that the periodic interrupt amplifier additionally comprises a second amplifier connected in series to the second periodic switch, wherein the second amplifier is configured to perform second stage amplification on the signal. amplified deviation switched to periodic interruption frequency and amplified magnetic field signal switched to baseband frequency. Magnetic sensor according to claim 2, characterized in that the signal processing element further comprises a sampling and holding circuit coupled between the periodic interrupt amplifier and the filter circuit, wherein the sampling circuit and Retention is configured to sample a first pair of differential signals during a first half and a second half of a clock cycle, respectively, and produce two pairs of differential signals sampled during the clock cycle. Magnetic sensor according to claim 5, characterized in that the filter circuit further comprises a first filter configured to compute a second differential signal pair based on the two sampled differential signal pairs; and a second filter configured to further amplify the second differential signal pair, remove the offset signal and generate a third differential signal pair. Magnetic sensor according to claim 2, characterized in that the conversion element comprises: a first comparator configured to compare a determined output voltage based on the third pair of differential signals with a high voltage threshold; a second comparator configured to compare output voltage with a low voltage threshold; and a lockout logic circuit configured to produce a first voltage if the output voltage is greater than the high voltage threshold or a second voltage if the output voltage is less than the low voltage threshold, or maintain the output of the control element. conversion if the output voltage is between the low voltage threshold and the high voltage threshold, where the high voltage threshold and the low voltage threshold are determined based on the differential voltage reference pair, where: the first comparator and the second comparator takes a third pair of differential signals from the filter circuit and a pair of differential voltage references as inputs. Magnetic sensor according to claim 6, characterized in that the locking logic circuit is configured to produce a first voltage if a magnetic field strength reaches a pre-set working point or a second voltage if a magnetic field does not reach a preset release point, or maintain the conversion element output if the intensity of the magnetic field is between the preset release point and the preset work point. Magnetic sensor according to claim 1, characterized in that it further comprises: a rectifying circuit coupled with the input port and configured to provide a voltage supply to the magnetic field detection circuit, and a control circuit. configured to control the magnetic sensor to operate in at least one of the first state and the second state based on the switchable sensing signal, wherein the output control circuit comprises: a first switch coupled with the output port to form a first current path allowing the load current to pass from the output port out of the magnetic sensor in the first state; and a second switch coupled with the output port to form a second current path that allows the load current to pass from outside the magnetic sensor to the output port in the second state, wherein: the first and second switches operate on a basis. on the switchable sensing signal to selectively turn on the first and second current paths. 10. An integrated circuit for a magnetic sensor, characterized in that it comprises: an input port to be connected to an external power supply; an exit door; and a magnetic field sensing circuit configured to generate a magnetic sensing signal and comprising: a magnetic sensing element configured to sense an external magnetic field and producing a sensing signal, wherein the sensing signal includes a magnetic field signal. and a bypass signal, a signal processing element configured to amplify the sensing signal and remove interference to generate a processed sensing signal, and a conversion element configured to convert the processed sensing signal to the switchable sensing signal, which is used to control the magnetic sensor to operate in at least one of a first state and a second state in response to at least the switchable sensing signal, wherein the signal processing element comprises: a first periodic switch configured to separate the signal of detection on a magnetic field signal and a corresponding deviation signal at a periodic interruption frequency and a baseband frequency, respectively; a periodic interrupt amplifier configured to separately amplify the magnetic field signal and the deviation signal and switch the amplified deviation signal and the amplified magnetic field signal to the periodic interrupt frequency and baseband frequency, respectively, and a filter circuit configured to remove the bypass signal that has been switched to the periodic interrupt frequency. Motor assembly, characterized in that it comprises a motor driven by an AC power and the magnetic sensor as defined in any one of claims 1 to 9 or the integrated circuit for the magnetic sensor as defined in claim 10.