KR20170017819A - Magnetic sensor, motor assembly and integrated circuit - Google Patents

Abstract

The present invention relates to an electric circuit comprising: an integrated circuit which includes input ports (1102, 1104) and an output port (1106); and an output control circuit (1120) which is coupled to the output port (1106) and is configured to respond to a detection signal to control the integrated circuit to be operated in at least one of a first state and a second state. The input ports (1102, 1104) are connected to an external alternating current (AC) power source (1610). In the first state, load current flows in a first direction from an external port (1106) to the outside of the integrated circuit. In the second state, load current flows in a second direction opposite to the first direction from the outside of the integrated circuit to the integrated circuit through the output port (1106). The operating frequency of the integrated circuit is directly proportional to the frequency of the external AC power source (1610).

Description

MAGNETIC SENSOR, MOTOR ASSEMBLY AND INTEGRATED CIRCUIT BACKGROUND OF THE INVENTION 1. Field of the Invention [0001]

The present invention relates to the field of circuit technology. More particularly, the present invention relates to a magnetic sensor. The present invention also relates to a driver for a low-power permanent magnet motor.

During the start of the synchronous motor, the stator generates an alternating magnetic field to cause the permanent magnet rotor to oscillate. The amplitude of the oscillation of the rotor increases until the rotor starts to rotate, and finally the rotor is accelerated to rotate synchronously with the alternating magnetic field of the stator. In order to ensure the start of the prior art synchronous motor, the starting point of the motor is set low and as a result the motor can not operate at a relatively high operating point, and hence efficiency is low. In another aspect, the rotor can not ensure that the permanent magnet rotor rotates in the same direction each time because the stop or fixed position is not fixed. Thus, in applications such as fans and water pumps, the impeller driven by the rotor has a straight radial blade, which results in low operating efficiency of the fan and water pump.

Figure 1 shows a prior art drive circuit for a synchronous motor, which causes the rotor to rotate in the same predetermined direction each time it is started. In the circuit, the stator winding 1 of the motor is connected in series with TRIAC between two terminals M and N of the AC power source, the AC power source VM is converted into a DC voltage by the converter circuit DC, Is supplied to the position sensor (H). The magnetic pole position of the rotor in the motor is detected by the position sensor H and the output signal Vh of the position sensor H is connected to the switch control circuit PC to control the bidirectional thyristor T. [

Fig. 2 shows the waveform of the driving circuit. 2, in the drive circuit, regardless of whether the bi-directional thyristor T is switched on or off, the AC power supply supplies power to the converter circuit DC so that the converter circuit DC is connected to the position sensor H (See signal (VH) in Fig. 2). In low power applications, when the AC power source is commercial electricity of about 200 volts, the electrical energy consumed by the two resistors R2 and R3 in the conversion circuit DC is greater than the electrical energy consumed by the motor.

The magnetic sensor applies a Hall effect where a potential difference V is applied across the substrate when the current I flows through the substrate and the magnetic field B is applied at a positive angle with respect to the current I Direction and a direction perpendicular to the direction of the magnetic field B. Magnetic sensors are often implemented to detect stimulation of an electric rotor.

As circuit design and signal processing techniques evolve, there is a need for an implemented IC for improved and easy to use and accurate detection of magnetic sensors.

One aspect of the present invention provides a magnetic sensor including a housing, an input port and an output port both extending from the housing, and an electrical circuit. The input port is connected to an external AC power source. The electric circuit comprising: a magnetic field detection circuit configured to detect an external magnetic field and output a magnetic induction signal indicative of at least one characteristic of an external magnetic field; and a magnetic field detection circuit coupled to the output port, And an output control circuit configured to operate in at least one of a first state and a second state. In the first state, the load current flows from the output port to the outside of the magnetic sensor in the first direction, and in the second state, the load current flows from the outside of the magnetic sensor through the output port to the magnetic sensor, Lt; / RTI > The operating frequency of the magnetic sensor 1105 is directly proportional to the frequency of the external AC power source.

Another aspect of the present invention provides a motor assembly comprising a motor configured to operate based on an alternating current (AC) power source, a motor configured to detect a magnetic field generated by the motor and to operate in an operating state determined based on the detected magnetic field. And a bidirectional AC switch coupled in series with the motor and configured to control the motor based on the operating state of the magnetic sensor.

Another aspect of the present invention provides an integrated circuit comprising an input port and an output port and an output port coupled to the output port and adapted to control the integrated circuit to operate in at least one of a first state and a second state, And an output control circuit configured to at least respond to the signal. The input port is connected to an external AC (AC) power source. In the first state, the load current flows from the output port to the exterior of the integrated circuit, and in the second state, the load current flows from the exterior of the integrated circuit through the output port to the integrated circuit in a second direction opposite to the first direction. The operating frequency of the integrated circuit is directly proportional to the frequency of the external AC power source.

The methods, systems, and / or programming described herein are further described in terms of exemplary embodiments. These embodiments are described in detail with reference to the drawings. These embodiments are non-limiting examples in which reference numerals indicate like structures throughout the figures, wherein:
1 shows a prior art drive circuit for a synchronous motor according to an embodiment of the present invention.
Fig. 2 shows the waveform of the driving circuit shown in Fig.
FIG. 3 shows an exemplary view of a magnetic sensor 1105 according to an embodiment of the present invention.
FIG. 4 shows an exemplary view of a magnetic sensor 1105 according to another embodiment of the present invention.
5 shows an exemplary view of a magnetic sensor 1105 according to another embodiment of the present invention.
6 illustrates an exemplary implementation of an output control circuit 1120 in accordance with an embodiment of the present invention.
FIG. 7 illustrates an exemplary implementation of an output control circuit 1120 in accordance with another embodiment of the present invention.
FIG. 8 shows another exemplary view of a magnetic sensor 1105 according to another embodiment of the present invention.
9 illustrates an exemplary diagram of a rectifier 1150 in accordance with an embodiment of the present invention.
10 shows an exemplary view of a magnetic sensor 1105 according to another embodiment of the present invention.
11 illustrates an exemplary implementation circuit of a portion of a magnetic sensor 1105 in accordance with another embodiment of the present invention.
12 shows another embodiment of the output control circuit 1120 coupled to the state control circuit 1140. [
13 is a flowchart of an exemplary method of signal processing performed by the magnetic sensor 1105 according to an embodiment of the present invention.
Figure 14 illustrates an exemplary view of a motor assembly 2200 including a magnetic sensor as described herein in accordance with an embodiment of the present invention.
15 shows an exemplary diagram of a motor 2300 according to an embodiment of the present invention.
16 shows waveforms of output voltages from AC power source 1610 and rectifier bridge 1150, respectively, according to an embodiment of the present invention.

In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the related art. However, it will be apparent to those skilled in the art that the present invention may be practiced without such details. In other instances, well-known methods, procedures, systems, components, and / or circuits have been described at a relatively high level without detail to avoid unnecessarily obscuring aspects of the present invention.

Throughout the description and the claims, a term may have subtle meaning suggested or implied in terms that is beyond the explicitly stated meaning. Similarly, the term " in one embodiment / example "used herein need not necessarily refer to the same embodiment, and the term " in another embodiment / example" For example, the claimed subject matter is intended to include a combination of exemplary embodiments in whole or in part.

In general, terms may be at least partially understood from contextual use. For example, terms such as "and" or "or" and / or ", as used herein, may include various meanings that may depend on at least a part of the context in which such term is used. Generally, when "or" is used to relate a list such as A, B, or C used herein, A, B, and C, which are used in an inclusive sense, Or C < / RTI > Furthermore, the term "one or more ", as used herein, is to be interpreted as referring to any characteristic, structure, or characteristic in a single sense, or to describe a combination of characteristic, . Similarly, terms such as "a "," an ", or "the" may again be understood to convey singular or at least multiple uses depending at least in part on the context. It should also be understood that the term "based on" is not intended to convey an exclusive set of factors, but instead permits the presence of additional factors that are not necessarily undifferentiated again, can do.

FIG. 3 shows an exemplary view of a magnetic sensor 1105 according to an embodiment of the present invention. The magnetic sensor 1105 includes a housing (not shown), a semiconductor substrate in the housing (not shown), a first input A1 1102, a second input A2 1104, an output port B 1106, And an electronic circuit 1100 in the circuit. The electronic circuit 1100 includes a control signal generation circuit 1110 and an output control circuit 1120 coupled to the control signal generation circuit 1110. In an embodiment, the first input A1 1102 and the second input A2 1104 may be coupled directly to an external power source (e.g., 1610 in Figure 16). In an embodiment, the first input A1 1102 and the second input A2 1104 may be connected in series to an external power source, for example, via an external load.

The control signal generation circuit 1110 may be configured to detect one or more signals and to generate a control signal based on the detected one or more signals. In some examples, the one or more signals may be one or more electrical signals received via electrical wiring or cable. In some other examples, the one or more signals may be one or more magnetic signals or other types of signals received by the magnetic sensor 1105 wirelessly or by other means.

In operation, the control signal generation circuit 1110 determines whether a predetermined condition is satisfied based on the one or more detected signals. When a predetermined condition is satisfied based on one or more detected signals, the control signal generation circuit 1110 generates a first control signal and transmits the first control signal to the output control circuit 1120. Then, the magnetic sensor 1105 Will be controlled to operate in the first state. In the first state, the electrical (load) current will flow from the magnetic sensor to output port B 1106. The control signal generation circuit 1110 also generates a second control signal and transmits it to the output control circuit 1120 to control the magnetic sensor 1105 to operate in the second state. In the second state, the electrical (load) current may exit the output port B 1106 and flow to the magnetic sensor. A method of determining the first state or the second state in the control signal generation circuit will be described in more detail.

On the other hand, when a predetermined condition is not satisfied based on one or more detected signals, the control signal generation circuit 1110 generates a third control signal and transmits it to the output control circuit 1120 to control the magnetic sensor 1105 3 state. In the third state, the electrical (load) current does not flow through output port B 1106. In some situations in the third state, only a small amount of current flows through output port B 1106, that is, the intensity of the current is less than 1/5 of the electric (load) current.

In some embodiments, the output control circuit 1120 is coupled to the control signal generation circuit 1110 and controls the magnetic sensor 1105 to operate in a determined state based on the control signal received from the control signal generation circuit 1110 do. For example, when the output control circuit 1120 receives the first control signal, the output control circuit 1120 controls the magnetic sensor 1105 to output a first state in which the electric (load) current flows to the output port B 1106 . When the output control circuit 1120 receives the second control signal, the output control circuit 1120 controls the magnetic sensor 1105 such that the electric (load) current flows from the outside to the magnetic sensor through the output port B 1106 2 state. When the output control circuit 1120 receives the third control signal, the output control circuit 1120 controls the magnetic sensor 1105 so that the electric (load) current does not flow through the output port B 1106 ) Current, for example, less than one-quarter of the electrical (load) current flows). In an embodiment, the output control circuit 1120 can alternately receive a plurality of control signals including a first control signal, a second control signal, and the like. Thus, the output control circuit 1120 can control the magnetic sensors 1105 to operate alternately between different states. Specifically, the magnetic sensor 1150 can alternately operate between the first state and the second state. In the embodiment, when the magnetic sensor 1105 operates in the third state, the magnetic sensor 1105 can be prevented from operating in the first state or the second state.

In an embodiment, when the first input A1 1102 and the second input A2 1104 are connected to an external AC power source 1610 (FIG. 8), the first, second, The operating frequency of the sensor 1105 may be set to be directly proportional to the frequency of the external AC power source 1610. [ In an embodiment, the operating frequency of the magnetic sensor 1105 in the third state is twice the operating frequency of the first state or the second state, which is twice the frequency of the external AC power supply 1610.

4 is an exemplary diagram of a magnetic sensor 1105 according to a different embodiment of the present invention. In this embodiment, the magnetic sensor 1105 includes a first input A1 1102, a second input A2 1104, an output port B 1106, and an electronic circuit 1100. The electronic circuit 1100 includes a magnetic field detection circuit 1130, a state control circuit 1140 coupled with the magnetic field detection circuit 1130 and an output control circuit 1120 coupled with the state control circuit 1140.

The magnetic field detection circuit 1130 may be configured to detect an external magnetic field and output a magnetic induction signal in accordance with the detected external magnetic field. The magnetic induction signal can indicate or indicate the polarity and intensity of the external magnetic field.

The state control circuit 1140 may be configured to determine whether a predetermined condition is satisfied and also to send a control signal corresponding to the output control circuit 1120 based on the determination upon receipt of the control signal, The magnetic sensor 1120 can control the magnetic sensor 1105 to operate in a corresponding state determined based on the magnetic induction signal. Specifically, when a predetermined condition is satisfied, the corresponding state may be one of a first state and a second state, each of which corresponds to a specific polarity of an external magnetic field represented by the magnetic induction signal. For example, the first state may correspond to a situation where the first polarity of the external magnetic field is detected, and the second state may correspond to a situation where the second polarity of the external magnetic field (which is the opposite of the first polarity) is detected. State control circuit 1140 can transmit a control signal indicative thereof to output control circuit 1120 so that output control circuit 1120 can control the output of the output control circuit 1120 to the output control circuit 1120, The sensor 1105 can be controlled to operate in the first state. As described above, in the first state, the electric (load) current flows from the magnetic sensor through the output port B 1106 to the outside. If the predetermined condition is satisfied and the external magnetic field exhibits the second polarity opposite to the first polarity, the state control circuit 1140 transmits a control signal indicating this to the output control circuit 1120, 1120 can control the magnetic sensor 1105 to operate in the second state. As described above, in the second state, the electric (load) current flows from the outside to the magnetic sensor through the output port B 1106. [

On the other hand, if the state control circuit 1140 does not satisfy the predetermined condition (or the state control circuit 1140 does not respond to the magnetic induction signal or can not acquire the magnetic induction signal from the magnetic field detection circuit 1130) , The state control circuit 1140 can transmit a control signal indicating this to the output control circuit 1120 to control the magnetic sensor 1105 to operate in the third state. In the third state, no electrical (load) current flows through output port B 1106 (or only a small amount of current flows through output port B compared to the electrical (load) current, for example, (Less than 1/4 of the load current).

The output control circuit 1120 is coupled to the control signal generation circuit 1110 and is configured to control the magnetic sensor 1105 to operate in a state determined based on the control signal received from the control signal generation circuit 1110. [ For example, when the output control circuit 1120 receives the control signal indicating that the predetermined condition is satisfied and the first polarity of the external magnetic field, the output control circuit 1120 causes the magnetic sensor 1105 to operate in the first state (Load) current flows out of the magnetic sensor through output port B 1106. [ When the output control circuit 1120 receives the control signal indicating the satisfaction of the predetermined condition and the second polarity detected from the external magnetic field, the output control circuit 1120 controls the magnetic sensor 1105 to operate in the second state , And electric (load) current flows from the outside to output terminal B 1106 to the magnetic sensor. When the output control circuit 1120 receives a control signal indicating that a predetermined condition is not satisfied, the output control circuit 1120 controls the magnetic sensor 1105 to operate in the third state, Does not flow through output port B 1106 (or a small amount of current flows through output port B compared to the electrical (load) current, for example the current is less than 1/4 of the electrical (load) current). In an embodiment, the output control circuit 1120 may alternately receive a plurality of control signals in time. Thus, the output control circuit 1120 controls the magnetic sensor 1105 to operate in different states including the first state and the second state.

In an embodiment, the output control circuit 1120 may be configured based on the specification of the user. For example, the output control circuit 1120 may be configured to control the magnetic sensor 1105 to operate alternately between the working and high impedance states. The working state may correspond to the first state or the second state, and the high-impedance state may correspond to the third state.

5 shows an example of a magnetic sensor 1105 according to another embodiment of the present invention. In this embodiment, an exemplary structure of the magnetic field detection circuit 1130 is provided. An electronic circuit 1100 similar to that of FIG. 4 includes a magnetic field detection circuit 1130, a state control circuit 1140, and an output control circuit 1120. In this embodiment, the magnetic field detection circuit 1130 includes a magnetic sensing element 1131, a signal processing element 1132, and an analog-to-digital conversion element 1133.

The magnetic sensing element 1131 may be configured to detect an analog electric signal indicating certain information about an external magnetic field and output it to the signal processing element. For example, the output of the signal from the magnetic sensing element 1131 may indicate the polarity of the external magnetic field. In an embodiment, the magnetic sensing element 1131 may be implemented based on a Hall Board.

The signal processing element 1132 is configured to process the analog electrical signal from the magnetic supervisor 1131 and to generate an analog electrical signal that is processed by amplifying and reducing the interference of the analog electrical signal to improve the accuracy of the detected signal . The processed analog electric signal is transmitted to the analog-to-digital conversion element 1133.

The analog-to-digital conversion element 1133 can be configured to convert the processed analog electrical signal into a magnetic induction signal. In a situation where only the polarity of the external magnetic field needs to be detected, the magnetic induction signal may correspond to the switching digital signal. The state control circuit 1140 and the output control circuit 1120 in Fig. 5 operate in a manner similar to that described with reference to Fig.

6 illustrates an exemplary implementation of an output control circuit 1120 in accordance with an embodiment of the present invention. In an embodiment, the output control circuit 1120 may be configured according to the specifications of the user. As shown in Fig. 6, the output control circuit 1120 includes a first switch Kl 1410, a second switch K2 1420, and a third switch K3 1430. Each of the first switch K1 1410, the second switch K2 1420, and the third switch K3 1430 is a diode or a transistor. The first switch is coupled with output port B 1106 through third switch K3 1430 to form a first current path that causes the load current to flow through the first direction. The second switch is coupled to output port B 1106 through third switch K3 1430 to form a second current path that causes the load current to flow in a second direction opposite to the first direction. The first switch K1 1410 and the second switch K2 1420 selectively turn on corresponding current paths in response to the magnetic induction signal 1405. [

In an embodiment, the first switch K1 1410 and the second switch K2 1420 may be selectively turned on or off according to the specifications of the user. In an embodiment, the first switch K1 1410 and the second switch K2 1420 may be configured to receive a magnetic induction signal 1405 indicative of the detected polarity of the external magnetic field. The first switch K1 1410 and the second switch K2 1420 may be selectively turned on or off in response to the magnetic induction signal 1405. [ For example, the first switch K1 1410 may be a high voltage conductive switch, and the second switch K2 1420 may be a low voltage conductive switch. To accomplish this, the first switch K1 1410 is connected to a high voltage VDD 1407 (for example, a DC power source), and the second switch K2 1420 is connected to a low voltage (for example, a ground). When the magnetic induction signal 1405 has a high voltage indicating a first polarity detected from, for example, an external magnetic field, the first switch Kl 1410 can be turned on and the second switch K2 1420 is turned off . The first switch K1 1410 may be turned off and the second switch K2 1420 may be turned off if the magnetic induction signal 1405 has a low voltage that is opposite to the first polarity of the external magnetic field, Can be turned on.

In an embodiment, the third switch K3 1430 may be turned on or off based on whether the magnetic sensor 1105 satisfies a predetermined condition. For example, when the magnetic sensor 1105 satisfies a predetermined condition, the third switch K3 1430 can be turned on. If not, the third switch K3 1430 may be turned off. Details of a method for controlling the third switch will be described with reference to Fig.

As described above, when the magnetic sensor 1105 satisfies a predetermined condition and the magnetic induction signal has a high voltage, the first switch K1 1410 is turned on, the second switch K2 1420 is turned off, The switch K3 1430 is turned on. Thus, the first current path is turned on and the second current path is turned off. As a result, the output control circuit 1120 controls the magnetic sensor 1105 to operate in the first state. That is, the electric (load) current flows from the VDD 1407 through the first switch K1 1410, the third switch K3 1430, and finally flows out of the output port B 1106. [

When the magnetic sensor 1105 satisfies a predetermined condition and the magnetic induction signal has a low voltage, the first switch K1 1410 is turned off, the second switch K2 1420 is turned on, and the third switch K3 1430 ) Is turned on. Thus, the first current path is turned off and the second current path is turned on. As a result, the output control circuit 1120 can control the magnetic sensor 1105 to operate in the second state. That is, the electric (load) current enters the output port B 1106 and flows to the ground through the third switch K3 1430 and the second switch K2 1420. [

When the magnetic sensor 1105 does not satisfy the predetermined condition, the third switch K3 1430 is turned off. Therefore, neither the first current path nor the second current path is turned on. As a result, the output control circuit 1120 can control the magnetic sensor 1105 to operate in the third state regardless of whether the magnetic induction signal 1405 is a high voltage or a low voltage. That is, no electrical (load) current flows through output port B 1106 (or only a small amount of current flows through output port B when compared to the aforementioned electrical (load) current) ) Current and can not drive a load outside the magnetic sensor). Therefore, the output control circuit 1120 does not respond to the magnetic induction signal 1405. [

FIG. 7 illustrates an exemplary implementation of an output control circuit 1120 in accordance with another embodiment of the present invention. As shown, the output control circuit 1120 is coupled to the magnetic field detection circuit 1130. The output control circuit 1120 receives the magnetic induction signal 1405 (as shown in FIG. 6) from the magnetic field detection circuit 1130. The output control circuit 1120 includes a single conductive switch D (1510), a resistor R (1520), and a third switch K3 (1430). Single conductive switch D 1510 is coupled to output port B 1106 through third switch K3 1430 and forms a first current path that allows the load current to flow in a first direction. Resistor R 1520, on the other hand, is coupled to output port B 1106 through third switch K3 1430 to provide a second current path that allows the load current to flow in a second direction opposite to the first direction . When the magnetic sensor 1105 satisfies a predetermined condition, the third switch K3 1430 can be turned on. If not, the third switch K3 1430 may be turned off. Details of the on / off control method of the third switch will be described with reference to Fig. The single conductive switch D 1510 may be selectively turned on or off based on the magnetic induction signal 1405 received from the magnetic field detection circuit 1130. For example, when the magnetic induction signal 1405 has a high voltage, the single-conductive switch D 1510 is turned on. When the magnetic induction signal 1405 has a low voltage, the single-conductive switch D 1510 is turned off. In another embodiment, resistor R (1520) may be replaced by another single-conducting switch connected in anti-parallel with single-conducting switch D (1510).

As described above, when the magnetic sensor 1105 satisfies a predetermined condition and the magnetic induction signal 1405 received from the magnetic field detection circuit 1130 has a high voltage, the single-conductive switch D 1510 and the third switch K3 1430 are all turned on. Thus, the first current path is turned on and the second current path is turned off. As a result, the output control circuit 1120 can control the magnetic sensor 1105 to operate in the first state. That is, the electric (load) current exits output port B 1106 and flows through single-conductive switch D 1510 and third switch K 3 1430.

When the magnetic sensor 1105 satisfies a predetermined condition and the magnetic induction signal 1405 received from the magnetic field detection circuit 1130 has a low voltage, the single-conductive switch D 1510 is turned off and the third switch K3 1430 are turned on. Therefore, the first current path is turned off. Since the magnetic induction signal is low and the third switch K3 1430 is on, the second current path is conducted. As a result, the output control circuit 1120 can control the magnetic sensor 1105 to operate in the second state. That is, the electric (load) current enters the output port B 1106 and flows through the third switch K3 1430 and the resistor R1520, respectively.

When the magnetic sensor 1105 does not satisfy the predetermined condition, the third switch K3 1430 is turned off. In this case, neither the first current path nor the second current path is turned on. As a result, the output control circuit 1120 can control the magnetic sensor 1105 to operate in the third state regardless of whether the magnetic induction signal 1405 has a high voltage or a low voltage. That is, no electric (load) current flows through the output port B 1106. Therefore, the output control circuit 1120 does not respond to the magnetic induction signal 1405. [

FIG. 8 shows another exemplary view of a magnetic sensor 1105 according to another embodiment of the present invention. As shown, the input 1615 of the magnetic sensor 1105 is connected to an external AC power source 1610. [ In this embodiment, the magnetic sensor 1105 includes a rectifier 1150 connected to an input 1615 and receives a pair of differential AC signals from an external AC power supply 1610 and outputs a pair of differential AC signals to a DC (DC) signal. The output voltage of the rectifier 1150 may be used to power up the magnetic field detection circuit 1130, the state control circuit 1140 and the output control circuit 1120. The magnetic sensor 1105 may further include a magnetic field detection circuit 1130, a state control circuit 1140, and an output control circuit 1120 as described above.

9 illustrates an exemplary diagram of a rectifier 1150 in accordance with an embodiment of the present invention. Rectifier 1150 includes a full wave rectifier bridge and a stabilization unit coupled to a full wave rectifier. The full wave rectifier bridge includes a first diode D1 1710, a second diode D2 1720, a third diode D3 1730, and a fourth diode D4 1740. 9, a first diode D1 1710 is connected in series with a second diode D2 1720 and a third diode D3 1730 is connected in series with a fourth diode D4 1740. The output of the first diode D1 1710 and the input of the second diode D2 1720 are connected to the first input port VAC + 1705 and the output of the third diode D3 1730 and the output of the fourth diode D4 1740 The input is connected to the second input port VAC- (1707). In an embodiment, the first input port VAC + 1705 and the second input port VAC- 1707 are a pair of differential AC signals. The full wave rectifier bridge may be configured to convert a pair of differential AC signals output by AC power source 1610 into a DC signal. The stabilization unit may be a Zener diode DZ (1750) and is configured to stabilize the DC signal output by the full wave rectifier bridge within a predetermined range. The stabilization unit outputs a stabilized DC voltage.

In an embodiment, the input of the first diode D1 1710 is connected to the input of the third diode D3 (1730) at the first connection point to form the grounded port of the full wave rectifier bridge. The output of the second diode D2 1720 is also connected to the output of the fourth diode D4 1740 at the second connection point to form the output port VDD 1760 of the full wave rectifier bridge. Zener diode DZ (1750) is located between the first connection point and the second connection point. In an embodiment, the output VDD 1760 may be coupled directly to the output control circuit 1120.

In an embodiment, the first input port VAC + 1705 and the second input port VAC- 1707 are connected to an external AC power source 1610. In this case, the output control circuit 1120 may be responsive to the polarity of the external AC power supply 1610 in addition to the magnetic induction signal 1405.

In an embodiment, whether the magnetic sensor 1105 operates in the first state, the second state, or the third state depends on whether the magnetic sensor 1105 satisfies a predetermined condition, which may be determined according to the specification of the user . Thus, the output control circuit 1120 controls the magnetic sensor 1105 in a first state in which the electric (load) current can flow out of the output port B 1106 or in the first state in which the electric (load) current flows to the output port B 1106 And to operate in a second state in which it can flow. Alternatively or additionally, when the magnetic sensor 1105 satisfies a predetermined condition, the output control circuit 1120 outputs the polarity of the external AC power supply 1610 and the magnetic induction signal 1405 It is possible to control to alternately operate between the first state and the second state in response to the polarity of the magnetic field. When the magnetic sensor 1105 does not satisfy the predetermined condition, the output control circuit 1120 controls the magnetic sensor 1105 so that the electric (load) current does not flow through the output port B 1106, It is possible to control to operate in a third state in which only a small amount of current flows through the output port B compared to the current, for example, the current intensity is less than 1/4 of the electric (load) current.

The output control circuit 1120 outputs the magnetic sensor 1105 to the first state or the second state in response to both the magnetic induction signal and the external AC power supply 1610. In this embodiment, 2 state. For example, when the magnetic sensor 1105 satisfies a predetermined condition and the magnetic induction signal 1405 indicates that the external magnetic field has the first magnetic pole and the external AC power source 1610 has the first electrode, the output control circuit 1120 can control the magnetic sensor 1105 to operate in the first state. In another example, when the magnetic sensor 1105 meets a predetermined condition and the magnetic induction signal 1405 has the second magnetic pole whose external magnetic field is opposite to the first magnetic pole and the AC power source 1610 is the opposite The output control circuit 1120 can control the magnetic sensor 1105 to operate in the second state.

10 shows an exemplary view of a magnetic sensor 1105 according to another embodiment of the present invention. In this embodiment, an exemplary structure of the state control circuit 1140 is provided. As shown, the input 1615 of the cuff sensor 1105 is connected to an AC power source 1610. [ As previously shown, magnetic sensor 1105 is connected to input 1615 and includes a rectifier (not shown) configured to receive a pair of differential AC signals from an external AC power source 1610 and to convert the pair of differential AC signals into a DC signal. (1150). The magnetic sensor 1105 further includes a magnetic field detection circuit 1130, a state control circuit 1140, and an output control circuit 1120. 10, the state control circuit 1140 further includes a voltage detection circuit 1141, a delay circuit 1142, and a logic circuit 1143.

Voltage detection circuit 1142 may be configured to detect whether the voltage in magnetic sensor 1105 is equal to or greater than a threshold voltage. When the voltage exceeds the threshold voltage, the voltage detection circuit 1142 generates a predetermined trigger signal and transmits it to the delay circuit 1141. In an embodiment, the voltage may be the supply voltage of the magnetic field detection circuit 1130. The threshold voltage may be a minimum voltage necessary for operation of the magnetic sensing element 1131, the signal processing element 1132, and the analog-to-digital conversion element 1133 of the magnetic field detection circuit 1130. [ In an embodiment, the threshold voltage may be set to a value less than the stabilized DC voltage achieved by the stabilization unit described with respect to FIG.

When triggered by the voltage detection circuit 1142, the delay circuit 1141 determines whether the magnetic sensor 1105 satisfies a predetermined condition. Specifically, the delay unit 1141 will start timing when receiving a predetermined trigger signal from the voltage detection circuit 1142. [ If the determined period is equal to or longer than the predetermined period, the delay circuit 1141 determines that the magnetic sensor 1105 satisfies the predetermined condition. If not, the delay circuit 1141 determines that the magnetic sensor 1105 does not satisfy the predetermined condition.

The logic circuit 1143 may be configured to enable the output control circuit 1120 to respond to the magnetic induction signal and to control the magnetic sensor 1105 to operate in any of the three states in the manner described above. For example, the magnetic sensor may operate in a first state or a second state if the recorded period recorded by the delay circuit 1141 is equal to or greater than a predetermined period of time. The logic circuit 1143 also enables the output control circuit 1120 to control the magnetic sensor 1105 to operate in the third state when the period of time recorded by the delay circuit 1141 is less than a predetermined period .

The detection of the supply voltage of the magnetic field detection circuit 1130 reaching the predetermined voltage threshold can be performed by the entire modules of the magnetic field detection circuit 1130, that is, the magnetic detection element 1131, the signal processing element 1132, And the analog-to-digital conversion element 1133 function normally.

11 shows an exemplary implementation of a circuit of a portion of a magnetic sensor 1105 according to another embodiment of the present invention. 12 shows an exemplary transition of the output control circuit 1120 and the state control circuit 1140. In Fig. The state control circuit 1140 includes a voltage detection circuit 1141, a delay circuit 1142 and a logic circuit 1143 which is an AND gate 1910 as shown in Fig. The first input of the AND gate 1910 corresponds to the magnetic induction signal 1905 and the second input of the AND gate 1910 is coupled to the output of the delay circuit 1141, May be coupled to the control circuit 1120.

In this embodiment, the output control circuit 1120 includes three high voltage conductive switches M0 1920, M1 1960, M2 1970, a diode D5 1980, an inverter 1990, a first resistor R1 1930, And resistor R2 (1950). Switch M0 1920 is connected to the output of AND gate 1910. The input of switch M0 1920 is connected to the voltage output port 1940 (OUTAD +) of rectifier 1150 via resistor R1 1930. Switch M2 (1970) is coupled in parallel with switch M0 (1920). The control terminal of switch M2 (1970) is connected to the output of delay circuit 1141 via inverter (1990). In an embodiment, the equivalent resistance of switch M2 (1970) is greater than that of switch M0 (1920).

In operation, if the period of time recorded by the delay circuit 1141 is equal to or longer than a predetermined threshold period, the delay circuit 1141 outputs a high voltage. This high voltage therefore allows the magnetic induction signal 1905 from the magnetic field detection circuit 1130 to be transmitted to the switch M0 1920 via the AND gate 1910. [ In addition, when the signal from AC power source 1610 is in a positive half cycle and magnetic induction signal 1905 from magnetic field detection circuit 1130 outputs a low voltage, switch M0 1920 and switch M2 1970 And switch M1 (1960) may be turned on. As a result, the electrical (load) current may exit through output port B 1106 and flow through switch Ml 1960. That is, the output control circuit 1120 operates the magnetic sensor 1105 in the first state. Alternatively, when the signal from AC power supply 1610 is in a negative half cycle and magnetic induction signal 1905 from magnetic field detection circuit 1130 outputs a high voltage, switch M0 1920 may be turned on , Switch M1 (1960), and switch M2 (1970) may be turned off. As a result, the electrical (load) current may enter output port B 1106 and flow through diode D5 1980 and switch M0 1920. [ That is, the output control circuit 1120 can control the magnetic sensor 1105 to operate in the second state.

The delay circuit 1141 and the AND gate 1910 can output a low voltage and the switches M0 1920 and M1 can be turned off when the delayed time period recorded by the delay circuit 1141 is shorter than the threshold period And switch M2 (1970) can be turned on. As a result, the electric current enters output port B 1106 and flows through diode D5 1980 and switch M2 1970. Since the equivalent resistance of the switch M2 (1970) is large, the electric current is very small or negligible. That is, the output control circuit 1120 controls the magnetic sensor 1105 to operate in the third state.

12 shows another embodiment of the output control circuit 1120 coupled to the state control circuit 1140. [ The state control circuit 1140 includes a voltage detection circuit 1141, a delay circuit 1142, and a logic circuit 1143. Specifically, the logic circuit 1143 of the state control circuit 1140 includes a first signal input port 2002, a second signal input port 2004, a first signal output port 2006, and a second signal output port 2008). The first signal input port 2002 may be coupled to the output of the delay circuit 1141 and the second signal input port may be coupled to receive the magnetic induction signal 2005. [ The logic circuit 1143 may be configured to output a low voltage to the delay circuit 1141 if the recorded period recorded by the delay circuit 1141 is shorter than the threshold period. On the other hand, when the recorded period recorded by the delay circuit 1141 is equal to or longer than the threshold period, the delay circuit 1141 can output a high voltage. In addition, the logic circuit 1143 can output the magnetic induction signal 2005 through the first signal output port 2006 and the second signal output port 2008. The output signal at the first signal output port 2006 and the second signal output port 2006 may have a 180 degree phase shift. It should be understood that the output signals at the first output port 2006 and the second output port 2008 can not have a high voltage at the same time.

In this embodiment, the output control circuit 1120 includes three switches: switches M3 2060, M4 2040, M5 2070, two resistors, namely, resistor R3 2050, and resistor R4 2030, , And a protection diode D6 (2020). Specifically, switches M3 2060 and M5 2070 are both high voltage conductive switches, and switch M4 2040 is a low voltage conductive switch. The control terminals of the switch M3 2060 and the switch M5 2070 are connected to the first signal output port 2006 and the second signal output port 2008 of the logic circuit 1143, respectively. The input of switch M3 2060 is connected to the first port of resistor R3 (2050). The output of switch M3 2060 is connected to the ground output OUTAD- (2080) of rectifier 1150 (shown in FIG. 7).

The control terminal of switch M4 2040 is connected to the second port of resistor R3 (2050). The input of switch M4 2040 is connected to the voltage output port OUTAD + 2010 of rectifier 1150. The output of switch M4 (2040) is connected to the input of switch M5 (2070). The output of the switch M5 2070 is connected to the voltage output port OUTAD- (2080) of the rectifier 1150. [ In an embodiment, the voltage output port OUTAD- (2080) is a floating ground. The output of switch M4 2040 is connected to the input and output port B 1106 of switch M5 2070. The control terminal of the switch M4 2040 is connected to the positive electrode of the protection diode D6 (2020). The input of the switch M4 2040 is connected to the cathode of the protection diode D6 (2020). The resistor R4 2030 is connected between the control terminal and the input terminal of the switch M4 2040. [

In operation, when the period of time recorded by the delay circuit 1141 is equal to or longer than the threshold period, the delay circuit 1141 outputs a high voltage. In this case, the logic circuit 1143 allows the magnetic induction signal to be output through the first signal output port 2006 or the second signal output port 2008. [ The output signals at the first signal output port 2002 and the second signal output port 2004 may have a phase difference of 180 degrees. Further, when the signal from the AC power supply 1610 is in a positive half cycle and the magnetic induction signal 2005 from the magnetic field detection circuit 1130 corresponds to a high voltage, the switches M3 2060 and M4 2040 And switch M5 2070 may be turned off. As a result, the electric (load) current flows out of output port B 1106 and flows through switch M4 2040. That is, the output control circuit 1120 controls the magnetic sensor 1105 to operate in the first state. Alternatively, when the signal from the AC power source 1610 is in a negative half cycle and the magnetic induction signal 2005 from the magnetic field detection circuit 1130 corresponds to a low voltage, the switches M3 2060 and M4 2040, And switch M5 2070 can be turned on. As a result, the electric current enters the output port B 1106 and flows through the switch M5 (2070). That is, the output control circuit 1120 controls the magnetic sensor 1105 to operate in the second state.

The output control circuit 1120 is designated to control the magnetic sensor 1105 to operate in the third state when the recorded period recorded by the delay circuit 1141 is shorter than the threshold period. In this case, the delay circuit 1141 outputs a low voltage, and the logic circuit 1143 outputs a low voltage at each of the first output port 2006 and the second output port 2008, and the switches M3 2060, M4 2040, and M5 2070 may be turned off. As a result, no electrical current flows through output port B 1106 (or only a small amount of current flows through output port B 1106 as compared to the above-described electrical (load) current) ) Less than 1/4 of the current).

13 is a flowchart of an exemplary method of signal processing performed by the magnetic sensor 1105 according to the present embodiment. In step S101, an external magnetic field is detected. The magnetic induction signal may indicate that polarity and / or intensity of the external magnetic field is generated. Specifically, in step S101, an analog electric signal related to the external magnetic field and information related thereto are detected and output. Further, the detected analog electrical signal can be processed by amplifying the analog electrical signal and reducing interference. In addition, the processed analog electrical signal may be transformed to produce a magnetic induction signal. In some applications, the magnetic induction signal can be switched to a digital signal representing the polarity of the external magnetic field.

In step S102, it is determined whether or not a predetermined condition is satisfied. The predetermined condition is related to or evaluated with respect to a specific voltage of the magnetic sensor. If the predetermined condition is satisfied, the method proceeds to step S103. If not, the method proceeds to step S104. Specifically, the predetermined condition may be set as a predetermined period in which the voltage of the magnetic sensor reaches a predetermined voltage threshold value. In an embodiment, whether or not a predetermined condition is satisfied can be determined based on a period during which the voltage of the magnetic sensor 1105 is equal to or more than a predetermined voltage threshold. As described above, in order to perform step S102, it is determined whether or not the voltage of the magnetic sensor 1105 reaches a predetermined voltage threshold value. If so, the delay circuit 1142 begins the timing. When the period reaches a predetermined length, it is determined that the predetermined condition is satisfied. If not, it is determined that the predetermined condition is not satisfied.

In step S103, based on the magnetic induction signal, the magnetic sensor is controlled to operate in at least one of the first state and the second state. As described herein, in the first state, electrical (load) current flows out of output port B 1106 and flows. In the second state, the electrical (load) current flows to output port B 1106. In step S104, the magnetic sensor is controlled to operate in the third state, where the magnetic sensor 1105 does not operate in the first state or the second state, i.e., the current does not flow through the output port B 1106 (or Negligible).

Figure 14 illustrates an exemplary view of a motor assembly 2200 including the magnetic sensors described herein, in accordance with an embodiment of the present invention. The motor assembly 2200 includes a motor M 1202 coupled with an external AC power source 1610, a controllable bi-directional AC switch 1300 coupled in series with a motor M 1202, and a magnetic sensor 1105. The magnetic sensor 1105 is located near the rotor of the motor 1202 to detect the variation of the magnetic field around the rotor.

In an embodiment, magnetic sensor 1105 includes a first input 1102 coupled to motor 1202, a second input 1104 coupled to an external AC power source 1610, an output of controllable bi-directional AC switch 1105 And an output 1106 coupled to the terminal.

In an embodiment, the motor assembly 2200 may further include a voltage reduction circuit 1200 configured to provide a reduced voltage obtained based on the AC power supply 1610 to the magnetic sensor 1105. In this embodiment, the first input 1102 of the magnetic sensor 1105 is coupled to the voltage reduction circuit 1200 instead.

15 shows an exemplary diagram of a motor 2300 according to an embodiment of the present invention. The motor 2300 is similar to the motor 1202 in Fig. In an embodiment, the motor 2300 includes a stator as a synchronous motor and a rotor M1 wound around the stator. The stator includes a stator core M2 and a single-phase winding M3 wound around the stator core M2. The stator core M2 may comprise pure iron, cast iron, cast steel, electric steel, silicon steel, or other soft magnetic material. The rotor M1 includes a permanent magnet. When the stator winding M3 is coupled in series with the AC power supply 1610, the rotor M1 can operate at a uniform speed of 60f / p rpm (revolutions per minute) in a stable phase, where f is AC Is the frequency of the power supply 1610, and p is the number of pole pairs of the rotor M1. The stator core M2 has two opposite poles, one of which has a pole arc (e.g., M4, M5). The outer surface of the rotor M1 is opposite to the exciting arc (e.g., M4, M5), thus forming a non-uniform gap between the outer surface and the exciting arc. The pole cords (for example, M4 and M5) of the stator poles have concave grooves. The portion of the excitation arc except for the concave groove has the same central axis as the rotor M1.

The non-uniform magnetic field can be formed in the above-described configuration, which ensures that the poles of the rotor M1 are related at an angle to the center axis of the stator poles when the rotor M1 is stationary. The angle ensures the initial torque for the rotor M1 every time the motor M is powered up under the influence of the magnetic sensor 1105. The poles of the rotor M1 may be at the boundary between the opposite poles of the rotor M1. The central axis of the stator may be a line passing through the center of the pole of the stator. In the embodiment, both the stator and the rotor M1 have two magnetic poles. In an embodiment, the stator and rotor M1 can have a large number of poles, for example four or six poles.

14, when the magnetic sensor 1105 satisfies a predetermined condition, the magnetic sensor 1105 generates a first state or a second state depending on the signal from the AC power source 1610 and the polarity of the permanent magnet rotor M1 And can operate in a second state. Specifically, when the signal from the AC power supply 1610 is in a positive half cycle and the magnetic field detection circuit 1130 detects that the permanent magnet rotor M1 has the first polarity, the output control circuit 1120 And controls the magnetic sensor 1105 to operate in the first state. That is, the electric current can flow from the magnetic sensor 1105 to the controllable bidirectional AC switch 1300. [ Alternatively, if the signal from the AC power supply 1610 is in a negative half cycle and the magnetic field detection circuit 1130 detects that the permanent magnet rotor M1 has a second polarity opposite to the first polarity, The control circuit 1120 controls the magnetic sensor 1105 to operate in the second state, where the electric current can flow from the controllable bidirectional AC switch 1300 to the magnetic sensor 1105. [

When the magnetic sensor 1105 does not satisfy the predetermined condition, the magnetic sensor 1105 operates in the third state, where no electric current flows between the controllable bidirectional AC switch 1300 and the magnetic sensor 1105 Or only a small amount of current flows between the controllable bi-directional AC switch 1300 and the magnetic sensor 1105).

In an embodiment, the magnetic sensor 1105 includes a rectifier 1150 as shown in FIG. 9 and an output control circuit 1120 as shown in FIG. 6, the output control circuit 1120 includes a first switch K1 1410 as a high voltage conductive switch, a second switch K2 1420 as a low voltage conductive switch, and a third switch K3 1430 . When the predetermined condition is satisfied, the third switch K3 1430 is turned on. Further, when the signal from the AC power supply 1610 is in the positive half cycle and the magnetic induction signal is high voltage, the first switch Kl 1410 is turned on and the second switch K2 1420 is turned off. As a result, the magnetic sensor 1105 operates in the first state, where the electric current is supplied from the AC power source 1610 to the motor M 1202, the voltage reduction circuit 1200, the first input port of the magnetic sensor 1105, The voltage output port of the second diode D2 in the full-wave rectifier bridge, the first switch K1 1410 of the output control circuit 1120, the output port B 1106 and the next controllable bidirectional AC switch 1105 Finally, the AC power supply 1610 is returned. Alternatively, when the signal from the AC power supply 1610 is in the negative half cycle and the magnetic induction signal is low, the first switch K1 1410 is turned off and the second switch K2 1420 is turned on. As a result, the magnetic sensor 1105 operates in the second state, where the electric current is transmitted from the AC power source 1610 to the controllable bidirectional AC switch 1105, the output port B 1106, the second switch K2 1420, Flows through the grounded port of the full wave rectifier bridge, the first diode D1 1710, the first input port of the magnetic sensor 1105, the voltage reduction circuit 1200 and the motor 1202 and finally to the AC power source 1610 I'm going back.

When the signal from the AC power source 1610 is in a positive half cycle and the magnetic field detection circuit 1130 outputs a low voltage or when the signal from the AC power source 1610 is in a negative half cycle and the magnetic field detection circuit 1130 is in the negative half cycle, The first switch K1 1410 and the second switch K2 1420 can not be turned on. Therefore, the output control circuit 1120 alternately operates the controllable bidirectional AC switch 1105 between the "on" and "off" The output control circuit 1120 controls the manner in which the magnetic sensor 1105 powers up the stator winding M3 based on the polarity of the AC power supply 1610 and the variation of the magnetic detection information, To rotate in a single direction along the rotor along the position of the magnetic field of the rotor. This enables the rotor M1 to rotate in a fixed direction each time the motor 1202 is powered up.

On the other hand, when the magnetic sensor 1105 does not satisfy the predetermined condition, the third switch K3 1430 is turned off. As a result, the magnetic sensor 1105 operates in the third state, where no electric current flows in the motor assembly 2200 (or a small amount of negligible current flows into the motor assembly 2200 as compared to the electric current described above That is, the intensity of the current is less than 1/4 of the electric current).

16 shows waveforms of output voltages from an AC power source 1610 and a rectifier bridge 1150, respectively, in accordance with an embodiment of the present invention. Specifically, the upper part of FIG. 16 shows the waveform of the output voltage of the AC power supply 1610, and the lower part of FIG. 24 shows the waveform of the output voltage of the rectifier bridge 1150. As shown, the frequency of the output voltage of the rectifier bridge is twice the frequency of the AC power source 1610.

When the waveform of the output voltage of the rectifier bridge 1150 rises, the output control circuit 1120 can operate in the third state before the output control circuit 1120 operates in the first state or the second state. Accordingly, when the waveform of the output voltage of the AC power source 1610 is in the positive half cycle, the magnetic sensor 1105 can operate in the first state. When the waveform of the output voltage of the AC power source 1610 is in the negative half cycle, the magnetic sensor 1105 can operate in the second state. Therefore, the operating frequency of the third state is directly proportional to the operating frequency of the first state or the second state, and is also proportional to the frequency of the voltage of the AC power supply 1610. In an embodiment, the operating frequency in the third state is twice the operating frequency in the first state or the second state, which is twice the frequency of the AC power supply 1610.

It should be understood that the above-described embodiments are for illustrative purposes only. The invention is not intended to be limiting. The magnetic sensor 1105 may be used in applications other than the motor assembly 2200 as described above.

Those skilled in the art will recognize that the present invention is susceptible to various modifications and / or enhancements. For example, the transition of the various components described above may be embodied in a hardware device, but may be implemented as a software-only solution, for example as an installation on an existing server. Also, the units of the host and client nodes described herein may be implemented as firmware, firmware / software combination, firmware / hardware combination, or hardware / firmware / software combination. In another embodiment, the motor and the controllable bidirectional AC switch may be coupled in series with respect to each other to form a first branch. The series-connected voltage reduction circuit and the magnetic sensor form a second branch. The first branch is coupled in parallel with the second branch between the two ends of the external AC power source.

While various embodiments of the present invention have been shown and described, it will be apparent to those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the present invention as defined by the following claims. Only some of which are described herein. Modifications and variations that fall within the true scope of the invention are intended by the following claims and the entire application.

Claims (10)

As a magnetic sensor:
housing:
An input port and an output port, both the input port and the output port extending from the housing, the input port being connected to an external AC power source; And
Electrical circuitry,
Wherein the electric circuit comprises:
A magnetic field detection circuit configured to detect an external magnetic field and output a magnetic induction signal indicative of at least one characteristic of the external magnetic field; And
And an output control circuit coupled to the output port and configured to respond to at least a magnetic induction signal to control the magnetic sensor to operate in at least one of a first state and a second state,
In the first state, a load current flows from the output port to the outside of the magnetic sensor in a first direction,
In the second state, a load current flows from the outside of the magnetic sensor through the output port to the magnetic sensor in a second direction opposite to the first direction, and
Wherein the operating frequency of the magnetic sensor is directly proportional to the frequency of the external AC power source. The magnetic sensor according to claim 1, wherein the output control circuit is configured to control the magnetic sensor to operate in at least one of the first and second states in response to the magnetic induction signal when a predetermined condition is satisfied. The magnetic sensor according to claim 2, wherein, when the predetermined condition is satisfied, the magnetic sensor alternately operates between the first state and the second state depending on the polarity of the external magnetic field and the polarity of the external AC power source. . The output control circuit according to claim 2, wherein when the predetermined condition is satisfied,
Wherein the magnetic induction signal causes the magnetic sensor to operate in a first state by allowing the load current to flow in a first direction when the external magnetic field has a first magnetic pole and the external AC power source has a first polarity, ; Also
Wherein the magnetic induction signal causes the load current to flow in the second direction when the external magnetic field has a second magnetic pole opposite to the first magnetic pole and the external AC power source has a second polarity opposite to the first polarity And to control the magnetic sensor to operate in the second state by allowing the magnetic sensor to operate in the second state. The magnetic sensor according to any one of claims 1 to 4, wherein the operating frequency of the magnetic sensor is equal to the frequency of the external AC power source when the magnetic sensor operates in the first state or the second state. 3. The apparatus of claim 2, wherein the output control circuit is further configured to control the magnetic sensor to operate in a third state when the predetermined condition is not met, wherein a negligible amount of load current flows through the output port Or the output port, and the operating frequency of the magnetic sensor in the third state is twice the frequency of the external AC power source. The electric circuit according to any one of claims 1 to 4, wherein the electric circuit is configured to propagate the external AC power source to generate an output voltage having a frequency twice the operating frequency of the magnetic sensor in the first or second state And a rectifier configured to rectify the magnetic field into the magnetic field. The electric circuit according to any one of claims 1 to 4, wherein the electric circuit comprises:
A voltage detection circuit configured to detect a specific voltage and output a triggering signal when the specified voltage is equal to or greater than a predetermined voltage threshold;
A delay circuit coupled in series with the voltage detection circuit and configured to, upon receipt of the triggering signal, to indicate a length of time during which a particular voltage is greater than or equal to a predetermined voltage slice; And
Coupled to the delay circuit,
Signaling that the predetermined condition is satisfied when the length of the time exceeds a predetermined length of time,
A logic circuit configured to signal that the predetermined condition is not satisfied if the length of time does not exceed a predetermined length of time;
Further comprising a magnetic sensor. As a motor assembly:
A motor configured to operate based on an alternating current (AC) power source;
The magnetic sensor according to claim 1, wherein the magnetic sensor is configured to detect a magnetic field generated by the motor and to operate in an operating state determined based on the detected magnetic field; And
A bidirectional AC switch coupled in series with the motor and configured to control the motor based on an operating state of the magnetic sensor;
≪ / RTI > As an integrated circuit:
An input port and an output port, the input port being connected to an external AC power source; And
An electric circuit, comprising:
And an output control circuit coupled to the output port and configured to control the integrated circuit in response to a signal that is at least detected to operate in at least one of a first state and a second state,
In the first state, the load current flows from the output port to the outside of the integrated circuit in the first direction,
In the second state, the load current flows from the exterior of the integrated circuit through the output port to the integrated circuit in a second direction opposite to the first direction, and
Wherein the operating frequency of the integrated circuit is directly proportional to the frequency of the external AC power source.

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