CN114167114A

CN114167114A - Novel linear isolation device

Info

Publication number: CN114167114A
Application number: CN202210126710.3A
Authority: CN
Inventors: 樊勃; 盛琳; 刘之炜; 侯婷
Original assignee: Meraki Integrated Shenzhen Technology Co ltd
Current assignee: Meraki Integrated Shenzhen Technology Co ltd
Priority date: 2022-02-11
Filing date: 2022-02-11
Publication date: 2022-03-11

Abstract

The application relates to a novel linear isolation device which is compatible with a semiconductor process and can be conveniently integrated and applied, and the linear isolation device mainly comprises an isolation layer, a coil and a Hall element. The coil is arranged on one side surface of the isolation layer and used for generating an electromagnetic field penetrating through the isolation layer when an analog current signal is accessed; the Hall element is arranged on the other side face of the isolation layer and is opposite to the coil, and the Hall element is used for measuring the field intensity of an electromagnetic field and generating an analog voltage signal. The technical scheme provides a novel signal linear isolation mode, and the isolation layer is arranged between the coil and the Hall element, so that the physical isolation effect of the two components can be realized, and the linear isolation transmission requirement from an analog current signal to an analog voltage signal is met.

Description

Novel linear isolation device

Technical Field

The present application relates to the field of electronic circuit technology, and more particularly to a novel linear isolation device compatible with existing semiconductor processes and capable of integrated applications.

Background

At present, most of signal isolation devices in the market are realized by adopting an optical coupler, the optical coupler adopts a photoelectric conversion principle to realize signal isolation, and the optical coupler has the characteristics of good linearity and excellent isolation performance, but also has the defects of low bandwidth and incompatibility with the existing integrated circuit process, so that the optical coupler needs to be added into a circuit board in an independent packaging mode, and the circuit board is large in area size and not beneficial to practical application.

In order to be compatible with an integrated circuit process, a digital isolator is used as a signal isolation device, but the digital isolator can be matched with an analog-to-digital converter and a digital-to-analog converter to realize signal isolation, and the method for realizing signal isolation transmission has the advantages of convenience in integration, complex framework and high cost, and has the defects that the bandwidth is limited by the conversion rate of an analog-to-digital/digital-to-analog conversion circuit and the problem of distortion exists. Although the digital isolator can also be realized by adopting a magnetic isolation mode or an isolation-tolerant mode, the power consumption of the two modes is in direct proportion to the rate of a transmission signal, and if the undistorted linear analog signal is to be transmitted in an isolation mode, a high transmission rate and high power consumption are needed, and the practical application is not facilitated.

Disclosure of Invention

In order to overcome the defects of the existing signal isolation device in practical application, the application provides a novel linear isolation device.

In one embodiment, a linear isolation device is disclosed comprising: an isolation layer; a coil disposed on one side of the isolation layer; the coil is used for generating an electromagnetic field penetrating through the isolation layer when an analog current signal is connected; the Hall element is arranged on the other side surface of the isolation layer and is opposite to the coil; the Hall element is used for measuring the field intensity of the electromagnetic field and generating an analog voltage signal.

The coil is provided with multiple windings, the multiple windings are tiled on one side face of the isolation layer, and an induction area is formed in the surrounding center of the multiple windings; the arrangement position of the Hall element on the other side face of the isolation layer is opposite to the sensing area, and the occupied area of the Hall element on the isolation layer is smaller than that of the sensing area on the isolation layer.

The multiple winding is formed by winding a conducting wire, and an outermost ring and an innermost ring are formed by winding; the multiple windings have any one of the following winding forms; the first winding form: the conducting wire is wound from the outermost ring to the innermost ring step by step along a preset winding direction, then wound from the innermost ring to the outermost ring step by step along the same winding direction, and the conducting wire wound inwards and the conducting wire wound outwards are crossed at a grading position; the second winding form: the conducting wire is wound from the innermost ring to the outermost ring step by step along a preset winding direction, then wound from the outermost ring to the innermost ring step by step along the same winding direction, and the conducting wire wound outwards and the conducting wire wound inwards are crossed at a grading position; the third winding form: the wire is wound in the first winding form and the second winding form, and a single coil, an interconnected bifilar coil or an interconnected more sub-coils is formed by the combination of the first winding form and the second winding form; the single coil, the interconnected double sub-coils and the interconnected more sub-coils which are formed by combination all have central symmetry structures.

A first signal end and a second signal end are respectively formed at two tail ends of the conducting wire, and one port of the first signal end and the second signal end is used for inputting the analog current signal; the Hall element is provided with a third signal end and a fourth signal end, and one port of the third signal end and the fourth signal end is used for outputting the analog voltage signal.

In one embodiment, the linear isolation device further comprises a voltage-current converter and a voltage amplifier; the voltage-current converter is connected with the coil and used for receiving an initial analog voltage signal, converting the initial analog voltage signal into an analog current signal which can be accepted by the coil and outputting the analog current signal to the coil; the voltage amplifier is connected with the Hall element and used for amplifying the analog voltage signal output by the Hall element and outputting the amplified analog voltage signal to the outside.

The linear isolation device comprises the isolation layer, the coil, the Hall element, the voltage-current converter and the voltage amplifier which are integrated on the same circuit module, and the circuit module is used for realizing linear isolation transmission under the condition of inputting the initial analog voltage signal and outputting the amplified analog voltage signal.

In one embodiment, the linear isolation device further comprises a current pulse generating circuit and a differential comparator; the current pulse generating circuit is connected with the coil and used for receiving an initial digital signal and converting the initial digital signal into a current pulse signal, and the current pulse signal is taken as an analog current signal which can be accepted by the coil and is output to the coil; the differential comparator is connected with the Hall element and used for carrying out differential comparison on the analog voltage signal output by the Hall element and outputting a differential digital signal to the outside.

The linear isolation device comprises the isolation layer, the coil, the Hall element, the current pulse generating circuit and the differential comparator which are integrated on the same circuit module, and the circuit module is used for realizing linear isolation transmission under the condition of initial digital signal input and differential digital signal output.

In one embodiment, the linear isolation device further comprises a fully differential transconductance amplifier and a transconductance amplifier; the fully-differential transconductance amplifier is connected with the coil and used for receiving a feedback voltage signal, differentially comparing the feedback voltage signal with a reference voltage signal and generating a differential current signal, wherein the differential current signal is used as an analog current signal which can be received by the coil and is output to the coil; the transconductance amplifier is connected with the Hall element and used for carrying out operation comparison on the analog voltage signal output by the Hall element and outputting an error control signal to the outside.

The linear isolation device comprises the isolation layer, the coil, the Hall element, the fully differential transconductance amplifier and the transconductance amplifier which are integrated on the same circuit module, and the circuit module is used for realizing linear isolation transmission under the condition of feedback voltage signal input and error control signal output.

The beneficial effect of this application is:

the novel linear isolation device comprises an isolation layer, a coil and a Hall element, wherein the coil is arranged on one side surface of the isolation layer and is used for generating an electromagnetic field penetrating through the isolation layer when an analog current signal is connected; the Hall element is arranged on the other side face of the isolation layer and is opposite to the coil, and the Hall element is used for measuring the field intensity of an electromagnetic field and generating an analog voltage signal. In the first aspect, the technical scheme provides a novel signal linear isolation mode, and due to the fact that the isolation layer is arranged between the coil and the Hall element, the physical isolation effect of the two components can be achieved, and therefore the linear isolation requirement from an analog current signal to an analog voltage signal is met; in the second aspect, the isolation layer, the coil and the hall element in the technical scheme can be set to be very small components, can be compatible with the existing semiconductor process, can be conveniently integrated on an integrated circuit such as a chip, and can overcome the problem that the conventional signal isolation device cannot be compatible with the integrated circuit process; in the third aspect, the technical scheme is that the isolation transmission of the analog current signal is realized through the magnetic field signal generated by the coil, so that the requirement of linear isolation can be met, the power consumption is very low, and the problems of distortion and high power consumption of the conventional signal isolation device can be solved; in the fourth aspect, each component in the technical scheme is easily matched with other electronic components for use, can realize the linear isolation and the efficient transmission of analog current signals, analog voltage signals, digital signals or feedback voltage signals, is easily applied to a plurality of integrated circuits in an expanding way, and has good reliability and application prospect.

Drawings

FIG. 1 is a cross-sectional view of a linear isolation device in an embodiment of the present application;

FIG. 2 is a top view of a linear isolation device;

FIG. 3 is a block diagram of the mating of a coil and a Hall element in one embodiment;

FIG. 4 is a block diagram of the cooperation of a coil and a Hall element in another embodiment;

FIG. 5 is a schematic view of a linear isolation device;

FIG. 6 is a schematic view of a linear isolation device according to another embodiment of the present application;

FIG. 7 is a schematic view of a linear isolation device according to yet another embodiment of the present application;

FIG. 8 is a schematic diagram of a current pulse generating circuit of a linear isolation device in yet another embodiment;

fig. 9 is a schematic view of a linear isolation device according to still another embodiment of the present application.

Detailed Description

The present application will be described in further detail below with reference to the accompanying drawings by way of specific embodiments. Wherein like elements in different embodiments are numbered with like associated elements. In the following description, numerous details are set forth in order to provide a better understanding of the present application. However, those skilled in the art will readily recognize that some of the features may be omitted or replaced with other elements, materials, methods in different instances. In some instances, certain operations related to the present application have not been shown or described in detail in order to avoid obscuring the core of the present application from excessive description, and it is not necessary for those skilled in the art to describe these operations in detail, so that they may be fully understood from the description in the specification and the general knowledge in the art.

Furthermore, the features, operations, or characteristics described in the specification may be combined in any suitable manner to form various embodiments. Also, the various steps or actions in the method descriptions may be transposed or transposed in order, as will be apparent to one of ordinary skill in the art. Thus, the various sequences in the specification and drawings are for the purpose of describing certain embodiments only and are not intended to imply a required sequence unless otherwise indicated where such sequence must be followed.

The numbering of the components as such, e.g., "first", "second", etc., is used herein only to distinguish the objects as described, and does not have any sequential or technical meaning. The term "connected" and "coupled" when used in this application, unless otherwise indicated, includes both direct and indirect connections (couplings).

The first embodiment,

Referring to fig. 1, fig. 2 and fig. 3, the present embodiment discloses a linear isolation device, which mainly includes an isolation layer 11, a coil 12 and a hall element 13, which are described below.

The isolation layer 11 has a physical isolation function, and can isolate the coil 12 and the hall element 13 in space, so as to avoid electrical contact between the coil 12 and the hall element 13. It is understood that since the isolation layer 11 is also required to transmit the magnetic field signal, the isolation layer 11 should not have a magnetic shielding function, and the isolation layer 11 may be made of a plastic plate, an insulating tape, a PCB, or the like.

The coil 12 is arranged on one side of the spacer 11, for example glued to the side of the spacer 11, or even arranged on the side of the PCB by etching. Here, the coil 12 functions to generate an electromagnetic field through the isolation layer when an analog current signal is applied, so that a magnetic field signal formed by the electromagnetic field passes through the other side of the isolation layer 11.

The hall element 13 is provided on the other side surface of the isolation layer 11, and is required to be opposed to the coil 12, and for example, the hall element 13 may be fixed to the side surface of the isolation layer 11 by bonding, soldering, pin-fitting, or the like. The hall element 13 is used here to measure the field strength of the electromagnetic field and to generate an analog voltage signal. It should be noted that the hall element 13 is also called a hall device or a hall sensor, is a magnetic sensor based on a hall effect, can be used for detecting a magnetic field and changes thereof, is used in various fields related to the magnetic field, and generally has the advantages of firm structure, small volume, convenient installation, low power consumption and high frequency.

In the present embodiment, referring to fig. 2, the coil 12 has a plurality of windings laid on one side of the separator 11, and a sensing region 121 is formed around the center of the plurality of windings. In addition, the arrangement position of the hall element 13 on the other side of the isolation layer 11 is opposite to the sensing region 121, for example, the hall element 13 is disposed in the fixing region 131 on the other side of the isolation layer 11. It should be noted that, in order to ensure the magnetic induction effect of the hall element 13 and accurately receive the magnetic field signal, the area occupied by the hall element 13 on the isolation layer 11 (e.g., the area of the fixed region 131) may be smaller than the area occupied by the sensing region on the isolation layer (e.g., the area of the sensing region 121).

In the present embodiment, referring to fig. 2, 3 and 4, the multiple windings forming the coil 12 are formed by winding a single wire, and the windings are formed into the outermost loop and the innermost loop, but the wire used for winding is preferably a thin copper wire. The multiple windings may take on a variety of different winding configurations, three alternative winding configurations are provided and described in detail below.

In one embodiment, a first winding configuration is provided, such as in fig. 3, in order to form multiple windings, the wire may be wound stepwise from the outermost loop to the innermost loop in a predetermined winding direction (clockwise or counterclockwise), and then stepwise from the innermost loop to the outermost loop in the same winding direction, with the inwardly wound wire crossing the outwardly wound wire at graduated positions (e.g., positions a, B). It will be appreciated that the wire of fig. 3 has a single direction of wrap and the wire connection is at the outermost loop, thereby forming a single coil.

In another embodiment, a second winding configuration is provided, such as in fig. 2, where the wire is wound in a predetermined winding direction from the innermost loop to the outermost loop and then in the same winding direction from the outermost loop to the innermost loop, with the outwardly wound wire crossing the inwardly wound wire at a stepped location. It will be appreciated that the wire of fig. 2 has a single winding direction, differing from the winding of fig. 3 in the location of the wire connection, which is the innermost loop in fig. 2, thereby forming a single coil.

In yet another embodiment, a third winding configuration is provided, the wire is wound with the first and second winding configurations described above, and the wire forms a single coil, interconnected bifilar coils, or interconnected further coils by a combination of the first and second winding configurations. Because the positions of the wire joints of the first winding form and the second winding form are different, the two winding forms can be nested with each other, for example, the first winding form is arranged inside the second winding form and is connected at the grading position to form a single coil, and the single coil has a central symmetry structure. For example, as shown in fig. 4, the wire is first wound in a second winding configuration to form a sub-coil 12-01; then leading out a lead from the outermost ring of the sub-coil 12-01, continuously winding in a first winding form, and winding to form the sub-coil 12-02; the intersection of the connecting lines of the sub-coil 12-01 and the sub-coil 12-02 can be seen at the position C in FIG. 4; thus, the wire is sequentially passed through the combination of the second winding configuration and the first winding configuration to form an interconnected dual sub-coil, and the sub-coil 12-01 and the sub-coil 12-02 are in a centrosymmetric configuration at position C. Of course, the winding form in fig. 4 may be further improved, for example, a lead is continuously led out from the outermost ring of the sub-coil 12-02 and is wound in the first winding form, and so on, more sub-coils may be obtained, as long as the last formed sub-coil and the first sub-coil 12-01 can be connected in a closed loop, and thus more interconnected coils can be formed in a combined manner, and then four sub-coils, six sub-coils or eight sub-coils formed in total can have a central symmetric structure under the condition of uniform distribution.

In the third winding form, the respective sub-coils can generate magnetic field signals in the same or opposite directions, and after the analog current signal is input to the coils formed by combining, the coils formed by combining can enhance the generated magnetic field signal or can suppress the influence of an interfering magnetic field in the external environment on the magnetic field signal. Because the magnetic field generated by each sub-coil has a certain independence, hall elements are required to be respectively arranged at the positions opposite to the sub-coils, and then the hall elements are connected in series. For example, as shown in fig. 4, a hall element 13-01 is arranged on the back surface of the partition plate corresponding to the central sensing region of the sub-coil 12-01, a hall element 13-02 is arranged on the back surface of the partition plate corresponding to the central sensing region of the sub-coil 12-02, and the hall element 13-02 are connected in series, and generate and output an analog voltage signal in cooperation with each other. In this embodiment, two ends of the conductive line form a first signal terminal and a second signal terminal, respectively, and one of the first signal terminal and the second signal terminal is used for inputting an analog current signal. For example, as shown in fig. 3, the two ends of the conducting wire form a first signal terminal 122 and a second signal terminal 123, respectively, and then one of the first signal terminal 122 and the second signal terminal 123 is used for inputting an analog current signal, for example, the analog current signal enters from the first signal terminal 122, passes through the coil 12 formed by multiple windings to generate a magnetic field signal, and then is output from the second signal terminal 123. In addition, the hall element 13 has a third signal terminal 132 and a fourth signal terminal 133, and then one of the third signal terminal 132 and the fourth signal terminal 133 is used for outputting an analog voltage signal, for example, the analog voltage signal is output from the third signal terminal 132, and the fourth signal terminal 133 can be grounded and used as a reference base voltage of the analog voltage signal.

It should be noted that, in order to make the apparatus better implement the isolated transmission function of the analog signal, it is preferable to make the hall element 13 reside in the relative center position of the coil 12, and the magnetic field signal generated by the coil 12 is converted into the analog voltage signal for output, of course, the number of turns of the multiple windings of the coil 12 can be adjusted according to the actual requirement, the shape of the coil may not be limited to the circular shape in fig. 2 and 3, and may also be set to be square or polygonal, and the shape of the coil may be set according to the actual requirement, and is not specifically limited herein.

Referring to fig. 5, a schematic diagram of a linear isolation apparatus in the present embodiment is disclosed, an analog current signal is input to the coil 12, the coil 12 generates a magnetic field signal under excitation of the analog current signal, the magnetic field signal is received by the hall element 13 which is isolated from the coil 12, the hall element 13 detects a change of the magnetic field signal and generates an analog voltage signal, and the analog voltage signal is output to the outside. It can be understood that the transmission process of the signals is illustrated in fig. 5, and the generation of the magnetic field signal is the key to realize the linear isolation of the components, so that the effective transmission effect of the analog current signal to the analog voltage signal can be achieved.

It should be noted that, although the components of the linear isolator device provided in this embodiment have simple structures, they can implement effective functional matching, and belong to a novel linear isolator, and the framework can be compatible with an integrated circuit process, and can be implemented by using an existing integrated circuit process, for example, the compatible implementation manner may be a PCB or an integrated circuit process, but is not limited to these two implementation manners.

It should be noted that, in the technical solution in this embodiment, the isolation transmission of the analog signal is implemented by using the hall effect principle, the input analog current signal driving coil 12 generates a magnetic field signal proportional to the current, the magnetic field signal passes through the isolation layer 11, and then the hall element 13 converts the magnetic field signal into an analog voltage signal proportional to the magnetic field, and outputs the analog voltage signal, thereby implementing the isolation transmission of the linear signal. Therefore, the linear isolation device disclosed by the technical scheme can realize the isolation transmission function from the linear current signal to the linear voltage signal.

It should be noted that the main power consumption components in the present embodiment are the coil 12 and the hall element 13, which makes the device power consumption lower than that of the conventional, existing linear isolator. Because the coil 12 can be implemented in various ways, such as on a chip or on a PCB, it is low in cost, compatible with existing semiconductor processes, and easy to integrate. In addition, as a continuous analog linear signal is transmitted, the distortion rate of the transmitted signal is very small; moreover, the isolation layer 11 is adopted for physical isolation, so that the reliability of isolation is greatly improved.

TABLE 1

Numbering

Isolation scheme

Power consumption

Type of signal transmitted

Complexity of structure

Cost of

Semiconductor process compatibility Property of (2)

1

Optical coupler

>5mW

Can transmit digital or Analog signal

Special semiconductors Materials and processes

Low, 1 cent

Incompatible semiconductor device Art and craft

2

Digital isolator

>3mW

Transmitting only digital messages Number (C)

The structure is complicated

The structure is complicated to The cost is high, and the device has the advantages of high cost,>15 beauty of Chinese yam Is divided into

Require special semiconductors Process to satisfy isolation Require that

3

In this example Linear isolation of Device for measuring the position of a moving object

<1mW

Can transmit digital or Analog signal

Simple structure, can High reliability

The content of the organic acid is low,<5 cents

Compatible with existing semiconductors Process for the preparation of a coating

Table 1 shows comparison conditions of the isolation schemes, and it is easy to find from comparison results that the linear isolation device in this embodiment has obvious advantages in terms of power consumption, transmission signal types, structural complexity, cost, and semiconductor process compatibility.

It can be understood that the technical solution in the embodiment provides a novel signal linear isolation manner, and since the isolation layer is arranged between the coil and the hall element, the physical isolation effect of the two components can be realized, thereby satisfying the linear isolation requirement from the analog current signal to the analog voltage signal. In addition, the isolation layer, the coil and the Hall element in the technical scheme can be set to be very small components, can be compatible with the existing semiconductor process and conveniently integrated in a chip, and can overcome the problem that the traditional signal isolation device cannot be compatible with the integrated circuit process. In addition, the technical scheme is that the magnetic field signal generated by the coil is used for realizing the isolation transmission of the analog current signal, so that the requirement of linear isolation can be met, the power consumption is very low, and the problems of distortion and high power consumption of the conventional signal isolation device can be solved.

Example II,

On the basis of the linear isolation device disclosed in the first embodiment, the present embodiment discloses an improved linear isolation device, which includes not only the isolation layer 11, the coil 12 and the hall element 13, but also the voltage-to-current converter 21 and the voltage amplifier 22, and referring to fig. 6 in particular, since fig. 6 is a schematic diagram of a signal transmission process, the isolation layer 11 is not illustrated therein.

The voltage-current converter 21 is connected to the coil 12, and the voltage-current converter 21 mainly functions to receive an input initial analog voltage signal, convert the initial analog voltage signal into an analog current signal acceptable to the coil 12, and output the analog current signal to the coil 12.

The voltage amplifier 22 is connected to the hall element 13, and the voltage amplifier 22 mainly functions to amplify an analog voltage signal output from the hall element 13 and output the amplified analog voltage signal to the outside.

It should be noted that, the arrangement manner of the coil 12 and the hall element 13 on the isolation layer 11, and the respective structures may refer to the description in the first embodiment, and are not described again here.

The voltage-to-current converter 21 performs V/I conversion, and converts an input voltage signal into a current signal satisfying a predetermined relationship. Generally, the voltage-current converter 21 is implemented by negative feedback, which may be current series negative feedback or current parallel negative feedback, and is mainly used in industrial control and many sensor applications, which can be regarded as the prior art. In general, the voltage-to-current converter 21 may adopt the prior art and may be regarded as a transconductance amplifier with limited gain of the prior art.

In the present embodiment, the components included in the linear isolation device, such as the isolation layer 11, the coil 12, the hall element 13, the voltage-to-current converter 21 and the voltage amplifier 22, can be integrated on the same circuit module (not shown in fig. 6), and then the circuit module is used for realizing the linear isolation transmission in the case of inputting the initial analog voltage signal and outputting the amplified analog voltage signal. It can be understood that the same integrated circuit module can be a chip or a circuit board (PCB), and a single integrated circuit is more easily miniaturized and integrated in function, and is also beneficial to being matched with other circuits for use.

It should be noted that the linear isolation device in this embodiment can implement transmission of an analog voltage signal, for an input initial analog voltage signal, the input initial analog voltage signal can be converted into an analog current signal proportional to the initial analog voltage signal by the voltage-current converter 21 mainly including a transconductance amplifier, then the analog current signal driving coil 12 generates a magnetic field signal proportional to the current signal, the magnetic field passes through the isolation layer 11, the receiving end is composed of the hall element 13 and the voltage amplifier 22, the hall element 13 can convert the magnetic field signal passing through the isolation layer 11 into an analog voltage signal proportional to the change of the magnetic field, the analog voltage signal generates an amplified analog voltage signal with driving capability by the voltage amplifier 22, and the amplified analog voltage signal is output to an external power actuator. In fig. 6, the whole signal transmission process is a linear analog signal, so that the transmission of the linear analog signal can be realized, and the problem of distortion does not exist.

Example III,

On the basis of the linear isolation device disclosed in the first embodiment, the present embodiment discloses an improved linear isolation device, which includes not only the isolation layer 11, the coil 12 and the hall element 13, but also the current pulse generating circuit 31 and the differential comparator 32, and referring to fig. 7 in particular, since fig. 7 is a schematic diagram of a signal transmission process, the isolation layer 11 is not illustrated therein.

The current pulse generating circuit 31 is connected to the coil 12, and the current pulse generating circuit 31 mainly functions to receive an input initial digital signal and convert the initial digital signal into a current pulse signal, which is an analog current signal that can be received by the coil 12 and is output to the coil 12.

The differential comparator 32 is connected to the hall element 13, and the main function of the differential comparator 32 is to perform differential comparison on the analog voltage signal output by the hall element 13 and output a differential digital signal to the outside. Of course, since the coil 12 inputs the current pulse signal, the analog voltage signal output from the hall element 13 can also be regarded as a voltage pulse signal according to the linear transmission relationship of the signals, and the voltage pulse signal is transmitted to the differential comparator 32.

In the digital circuit, the initial digital signal in fig. 7 is represented by a high level and a low level, and at this time, the waveform of the electric signal is a non-sinusoidal wave, so that the voltage or current that is not a direct current or a non-sinusoidal alternating current is collectively referred to as a pulse, and the current pulse generating circuit 31 converts the initial digital signal into a current pulse signal.

In one embodiment, the current pulse generating circuit 31 can be configured as shown in fig. 8, and specifically includes a digital in-phase buffer 311, a digital inverting buffer 312, and analog transistor switches 313 and 314, and

current sources

315 and 316, which together form a bidirectional current pulse generating circuit. In fig. 8, the high level in the initial digital signal passes through the digital in-phase buffer 311 to turn on the analog transistor switch 313, and the high level passes through the digital anti-phase buffer 312 to turn off the analog transistor switch 314, so that the output terminal of the current pulse generating circuit 31 is connected to the current source 315, thereby generating a positive current pulse; the low level of the initial digital signal turns off the analog transistor switch 313 through the digital in-phase buffer 311, and the low level turns on the analog transistor switch 314 through the digital inverting buffer 312, so that the output terminal of the current pulse generating circuit 31 is connected to the current source 316 to generate a negative current pulse.

It should be noted that the differential comparator 32 can adopt the prior art, and mainly compares two signals to determine whether they are equal or determine the magnitude relationship and the arrangement order between them, which is called comparison. The differential comparator 32 may be a circuit that compares an analog voltage signal with a reference voltage, and if both inputs are analog signals, the output is a binary signal 0 or 1, and when the difference between the input voltages increases or decreases and the sign of the input voltage does not change, the output is kept constant.

In the present embodiment, the linear isolation device includes various components, such as the isolation layer 11, the coil 12, the hall element 13, the current pulse generating circuit 31 and the differential comparator 32, which can be integrated on the same circuit module, and the circuit module is used for implementing linear isolation transmission in the case of the initial digital signal input and the differential digital signal output. It can be understood that the same integrated circuit module can be an integrated chip or a circuit board (PCB), and a single integrated circuit is more easily miniaturized and integrated in function, and is also beneficial to being matched with other circuits for use.

It should be noted that the linear isolation device in this embodiment can be used for isolated transmission of digital signals, and the application of digital isolated transmission can be realized by simply adding a circuit for generating bidirectional current pulses to the input end and adding a differential comparator to the output end.

Example four,

On the basis of the linear isolation device disclosed in the first embodiment, the present embodiment discloses an improved linear isolation device, which includes not only the isolation layer 11, the coil 12 and the hall element 13, but also the fully differential transconductance amplifier 41 and the transconductance amplifier 42, and specifically refer to fig. 9, since fig. 9 is a schematic diagram of a signal transmission process, the isolation layer 11 is not illustrated therein.

The fully differential transconductance amplifier 41 is connected to the coil 12, and the fully differential transconductance amplifier 41 mainly functions to receive an input feedback voltage signal, and generate a differential current signal after performing differential comparison between the feedback voltage signal and a reference voltage signal, where the differential current signal is used as an analog current signal that can be received by the coil 12 and is output to the coil 12. Wherein, the feedback voltage signal is input to the anode input end of the fully differential transconductance amplifier 41; the reference voltage signal may be generated by a reference voltage source and input to the cathode input of the fully differential transconductance amplifier 41.

The transconductance amplifier 42 is connected to the hall element 13, and the transconductance amplifier 42 mainly functions to compare the analog voltage signal output by the hall element 13 and output an error control signal to the outside.

It should be noted that the fully differential transconductance amplifier 41 is an amplifier for converting an input differential voltage into an output current, and thus is a voltage-controlled current source, and usually has an additional current input terminal for controlling the transconductance of the amplifier. The high-impedance differential input stage can work in cooperation with a negative feedback loop, so that the fully differential transconductance amplifier 41 is similar to a conventional transconductance amplifier. The input signal of the fully differential transconductance amplifier 41 is voltage, the output signal is current, and the gain is called transconductance, and the fully differential transconductance amplifier should belong to a general standard component, and has a commercially available product, and is mostly of a bipolar structure.

It should be noted that the transconductance amplifier 42 may be a bipolar OTA or CMOS transconductor, which has a wide application range and can be mainly used in two aspects. On one hand, signal operation and processing are carried out in various linear analog circuits; on the other hand, an interface circuit is arranged between the voltage signal variable and the current mode signal processing system, differential voltage signals to be processed are converted into control signals in a specific form, and then the control signals are sent to the current mode system for processing. Certainly, the transconductance amplifier 42 can also increase the signal voltage, and amplify the weak signal in multiple stages, so as to obtain the application effects of high amplification factor, flat frequency response and small distortion through a cascade connection mode.

It should be noted that the linear isolation device in this embodiment may include various components, such as the isolation layer 11, the coil 12, the hall element 13, the fully-differential transconductance amplifier 41, and the transconductance amplifier 42, which are integrated on the same circuit module, and the circuit module is used for implementing linear isolation transmission in the case of the feedback voltage signal input and the error control signal output. It can be understood that the same integrated circuit module can be an integrated chip or a circuit board (PCB), and a single integrated circuit is more easily miniaturized and integrated in function, and is also beneficial to being matched with other circuits for use.

It should be noted that the linear isolation device in this embodiment is substantially applied to an integrated isolation error amplifier, and is widely applied to an isolated power supply, and is an indispensable core module of the isolated power supply. Referring to fig. 9, a reference signal source (not shown in fig. 9) and a fully differential transconductance amplifier 41 may be connected to an input end, and a double-end to single-end transconductance amplifier may be connected to an output end, so as to implement the application of the isolation error amplifier.

It can be understood that, for the second, third, and fourth embodiments, each component in each technical scheme is easily used in cooperation with other electronic components, can realize linear isolation and efficient transmission of analog current signals, analog voltage signals, digital signals, or feedback voltage signals, is easily applied to a plurality of integrated circuits, and has good reliability and application prospects.

The present application is illustrated by using specific examples, which are only used to help understanding the technical solutions of the present application, and are not used to limit the present application. Numerous simple deductions, modifications or substitutions may also be made by those skilled in the art in light of the teachings of this application.

Claims

1. A novel linear isolation device, comprising:

an isolation layer;

a coil disposed on one side of the isolation layer; the coil is used for generating an electromagnetic field penetrating through the isolation layer when an analog current signal is connected;

the Hall element is arranged on the other side surface of the isolation layer and is opposite to the coil; the Hall element is used for measuring the field intensity of the electromagnetic field and generating an analog voltage signal.

2. The linear isolator device of claim 1, wherein the coil has multiple windings laid flat on one side of the isolation layer and having a sensing area formed around the center;

the arrangement position of the Hall element on the other side face of the isolation layer is opposite to the sensing area, and the occupied area of the Hall element on the isolation layer is smaller than that of the sensing area on the isolation layer.

3. The linear isolation device of claim 2, wherein the multiple windings are wound from a single wire and wound to form an outermost loop and an innermost loop; the multiple winding adopts a winding form of any one of the following windings;

the first winding form: the conducting wire is wound from the outermost ring to the innermost ring step by step along a preset winding direction, then wound from the innermost ring to the outermost ring step by step along the same winding direction, and the conducting wire wound inwards and the conducting wire wound outwards are crossed at a grading position;

the second winding form: the conducting wire is wound from the innermost ring to the outermost ring step by step along a preset winding direction, then wound from the outermost ring to the innermost ring step by step along the same winding direction, and the conducting wire wound outwards and the conducting wire wound inwards are crossed at a grading position;

the third winding form: the wire is wound in the first winding configuration and the second winding configuration and forms a single coil, an interconnected bifilar coil, or an interconnected further coil by a combination of the first winding configuration and the second winding configuration; the single coil, the interconnected double sub-coils and the interconnected more sub-coils which are formed by combination all have central symmetry structures.

4. The linear isolation apparatus according to claim 3, wherein both ends of the conductive line form a first signal terminal and a second signal terminal, respectively, one of the first signal terminal and the second signal terminal is used for inputting the analog current signal;

the Hall element is provided with a third signal end and a fourth signal end, and one port of the third signal end and the fourth signal end is used for outputting the analog voltage signal.

5. The linear isolation device of any one of claims 1 to 4, further comprising a voltage to current converter and a voltage amplifier;

the voltage-current converter is connected with the coil and used for receiving an initial analog voltage signal, converting the initial analog voltage signal into an analog current signal which can be accepted by the coil and outputting the analog current signal to the coil;

the voltage amplifier is connected with the Hall element and used for amplifying the analog voltage signal output by the Hall element and outputting the amplified analog voltage signal to the outside.

6. The linear isolation device of claim 5, wherein the isolation layer, the coil, the Hall element, the voltage-to-current converter, and the voltage amplifier are integrated on a same circuit module for achieving linear isolated transmission with the initial analog voltage signal input and the amplified analog voltage signal output.

7. The linear isolation device of any one of claims 1 to 4, further comprising a current pulse generation circuit and a differential comparator;

the current pulse generating circuit is connected with the coil and used for receiving an initial digital signal and converting the initial digital signal into a current pulse signal, and the current pulse signal is taken as an analog current signal which can be accepted by the coil and is output to the coil;

the differential comparator is connected with the Hall element and used for carrying out differential comparison on the analog voltage signal output by the Hall element and outputting a differential digital signal to the outside.

8. The linear isolation device of claim 7, wherein the isolation layer, the coil, the hall element, the current pulse generation circuit, and the differential comparator are integrated on the same circuit block for achieving linear isolated transmission with the initial digital signal input and the differential digital signal output.

9. The linear isolation device of any one of claims 1-4, further comprising a fully differential transconductance amplifier and a transconductance amplifier;

the fully-differential transconductance amplifier is connected with the coil and used for receiving a feedback voltage signal, differentially comparing the feedback voltage signal with a reference voltage signal and generating a differential current signal, wherein the differential current signal is used as an analog current signal which can be received by the coil and is output to the coil;

the transconductance amplifier is connected with the Hall element and used for carrying out operation comparison on the analog voltage signal output by the Hall element and outputting an error control signal to the outside.

10. The linear isolation device of claim 9, wherein the isolation layer, the coil, the hall element, the fully differential transconductance amplifier, and the transconductance amplifier are integrated on a same circuit block, and the circuit block is configured to implement linear isolation transmission with the feedback voltage signal input and the error control signal output.