Logic circuit chip

Abstract

The invention provides a logic circuit chip, which comprises a chip main body, and further comprises a magnetoresistive sensor which is packaged in the chip main body and is used for generating a first level signal according to the position of a magnetic object; the position identification and locking module is connected with the magnetoresistive sensor and is used for receiving the first level signal of the magnetoresistive sensor and a second level signal input from the outside and generating a display signal according to the first level signal and the second level signal; and the display driving module is connected with the position identifying and locking module and is used for outputting, driving and displaying according to the display signal. The magnetoresistive sensor, the position identifying and locking module and the display driving module are integrated on one chip, signals are identified through a special logic circuit, output driving display is carried out through the display driving module, and the functions are achieved instead of needing a plurality of discrete components.

Description

Technical Field

[0001] The present invention belongs to the technical field of position measurement, and in particular, relates to a logic circuit chip for measuring the position of an object. Background Art

[0002] With the continuous development of science and technology and the advancement of industrial automation, the demand for magnetic position detection devices required for industrial control has increased sharply. For example, they are widely used in magnetic flaps to detect the position of magnetic objects.

[0003] In the prior art, most of the position measurement devices of this type are equipped with the following functions: magnetic position detection, identification locking, position output and position display. In order to achieve the above functions, discrete components are usually used, which leads to high cost, bulky size, poor stability, low reliability, poor maintainability, a large number of components, complex processing, large circuit board area, easy failure and difficult maintenance.

[0004] Therefore, designing a position measurement device with high integration and improved stability, reliability and maintainability has become a technical problem to be solved urgently by those skilled in the art.

[0005] In view of this, the present invention is proposed. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies in the prior art and provide a logic circuit chip. The position of a magnetic object is detected by using a magnetoresistive sensor, and the magnetoresistive sensor, a position identification and locking module, and a display driver module are integrated on one chip. The position identification and locking module uses a dedicated logic circuit to identify the detected signal, and the display driver module outputs the identification result to the outside world, thereby solving the problem in the prior art that a plurality of discrete components are required to achieve the same function.

[0007] In order to solve the above technical problems, the basic concept of the technical solution adopted by the present invention is:

[0008] A logic circuit chip, comprising a chip body, and further comprising:

[0009] A magnetoresistive sensor generates a first level signal according to the position of the magnetic object;

[0010] The position identification and locking module is connected to the magnetoresistive sensor and is used to receive a first level signal from the magnetoresistive sensor and a second level signal input from the outside, and generate a display signal according to the first level signal and the second level signal;

[0011] The display driving module is connected to the position identification and locking module, and outputs a driving display according to a display signal.

[0012] Furthermore,

[0013] When the first level signal and the second level signal are both high level, the position identification and locking module generates a first display signal; when the first level signal and / or the second level signal is low level, the position identification and locking module generates a second display signal.

[0014] Furthermore,

[0015] When the magnetoresistive sensor does not detect a magnetic object, the first level signal is a high level;

[0016] When the magnetoresistive sensor detects a magnetic object, the first level signal changes from a high level to a low level.

[0017] Furthermore,

[0018] The display driver module is used to drive the display LED light. When a first display signal is received, the output drives the light of the first color to light up. When a second display signal is received, the output drives the light of the second color to light up.

[0019] Furthermore,

[0020] The logic circuit chip is used alone, and the second level signal is a preset high level signal; or,

[0021] A plurality of logic circuit chips are connected in series, and the second level signal is an output signal of adjacent logic circuit chips.

[0022] Furthermore,

[0023] A plurality of logic circuit chips are connected in series, and the second level signal of the logic circuit chip at the upstream end is preset to a high level;

[0024] The magnetic object moves along the arrangement direction of the logic circuit chips, the display driving module of the logic circuit chip upstream of the magnetic object displays a first display signal, and the display driving module of the logic circuit chip downstream of the magnetic object displays a second display signal.

[0025] Furthermore, it also includes a position output module, which is packaged inside the chip and connected to the magnetoresistive sensor and is used to receive a first level signal from the magnetoresistive sensor;

[0026] The position output module is an open collector output switch.

[0027] Further, when the received first level signal is at a high level, the collector output is disconnected;

[0028] When the received first level signal is at a low level, the collector output is turned on.

[0029] Furthermore, the chip adopts so-8-pin package, which are:

[0030] Pin 1 is used to receive the second level signal input from the outside;

[0031] Pin 2, position output module, output signal +;

[0032] Pin 3, position output module, output signal -;

[0033] Pin 4 is used to output a second level signal to an adjacent logic circuit chip;

[0034] Pin 5, power supply;

[0035] Pin 6 / Pin 7, output and drive the first color light or the second color light respectively;

[0036] Pin 8, power supply.

[0037] Furthermore, the magnetoresistive sensor is a TMR magnetoresistive sensor.

[0038] After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:

[0039] 1. The present invention integrates a magnetoresistive sensor, a position identification and locking module, a display driving module and a position output module on one chip. The position identification and locking module uses a dedicated logic circuit to identify the detected signal, and the display driving module outputs the identification result to the outside world, so as to detect and identify whether there is a magnetic object and output a position signal at the same time.

[0040] 2. The present invention connects a plurality of the chips in series. When a magnetic object stops above a certain chip, the chip is used as a dividing line, with one side displaying a first color light and the other side displaying a second color light, thereby realizing identification and locking of a moving magnetic object. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation of the present invention. Obviously, the accompanying drawings described below are only some embodiments. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0042] In the attached picture:

[0043] Figure 1 This is a schematic diagram of the inside of a chip in an embodiment of the present invention;

[0044] Figure 2 This is a schematic diagram of multiple chips connected in series in Embodiment 1 of the present invention;

[0045] Figure 3 This is a schematic diagram of multiple chips connected in series in the second embodiment of the present invention.

[0046] In the figure:

[0047] 1. Magnetoresistive sensor; 2. Position output module; 3. Display driver module; 4. Position identification and locking module; 51, pin 1; 52, pin 2; 53, pin 3; 54, pin 4; 55, pin 5; 56, pin 6; 57, pin 7; 58, pin 8. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0049] In the description of the present invention, it should be noted that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left”, “right”, “vertical”, “inside” and “outside” are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0050] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] like Figure 1 , Figure 2 , Figure 3 As shown, the present invention provides a logic circuit chip suitable for a position detection device, the logic circuit chip comprising: a chip body, and also comprising: a magnetoresistive sensor 1 encapsulated in the chip body, generating a first level signal according to the position of the magnetic object, and outputting the position signal through a position output module; a position identification and locking module 4, connected to the magnetoresistive sensor 1, for receiving the first level signal of the magnetoresistive sensor 1 and a second level signal input from the outside, and generating a display signal according to the first level signal and the second level signal; a display driving module 3, connected to the position identification and locking module 4, outputting a driving display according to the display signal.

[0052] Specifically, the chip is packaged in so-8-pin format, where the 8 pins are:

[0053] Pin 1 51 is used to receive a second level signal input from the outside;

[0054] Pin 2 52, position output module, output signal +;

[0055] Pin 3 53, position output module, output signal -;

[0056] Pin 4 54 is used to output a second level signal to an adjacent logic circuit chip;

[0057] 5-pin 55, power supply;

[0058] Pin 6 56 / Pin 7 57, output and drive the first color light or the second color light respectively;

[0059] 8-pin 58, power supply.

[0060] Specifically, most of the existing technologies use Hall magnetic sensors or AMR magnetoresistive sensors. These sensors have high power consumption, low sensitivity, poor consistency, and low operating frequency. They usually work 25 times per second and work between sleep and wake-up processes. Using multiple chips at the same time will produce a common frequency, causing a sudden increase in the current used.

[0061] Preferably, in the embodiment of the present invention, the detection module adopts TMR tunnel magnetoresistive sensor technology to detect the moving magnetic position signal. The TMR tunnel magnetoresistive sensor does not sleep and the operating frequency can reach 1000 Hz per second.

[0062] Specifically, the tunnel magnetoresistance sensor is composed of an iron core, a magnetoresistance material and a magnetic core. When the external magnetic field changes, its voltage will also change. In an embodiment of the present invention, when the tunnel magnetoresistance sensor detects a moving magnetic object, the output signal changes from a high level to a low level.

[0063] Specifically, when the first level signal and the second level signal are both high level, the position identification and locking module 4 generates a first display signal; when the first level signal and / or the second level signal is low level, the position identification and locking module 4 generates a second display signal.

[0064] Specifically, when the magnetoresistive sensor 1 does not detect a magnetic object, the first level signal is a high level; when the magnetoresistive sensor 1 detects a magnetic object, the first level signal changes from a high level to a low level.

[0065] Specifically, pin 6 56 and pin 7 57 are used for display drive output of position signal, and the maximum input or output current is 80mA, which is used to drive the signal light to light up.

[0066] Specifically, the display driving module 3 is used to drive the LED lamp. When receiving the first display signal, the output drives the first color lamp to light up. When receiving the second display signal, the output drives the second color lamp to light up.

[0067] Specifically, in the embodiment of the present invention, the first color light and the second color light are selected as the most easily distinguishable red LED light and green LED light, and the two signal lights are packaged under one display screen to ensure that only one display screen is used to show whether the red light is on or the green light is on.

[0068] Specifically, the logic circuit chip is used alone, and the second level signal is a preset high level signal; or, a plurality of logic circuit chips are connected in series, and the second level signal is an output signal of adjacent logic circuit chips.

[0069] Specifically, the chip provided in the embodiment of the present invention can be used alone or in series. When used alone, it can detect whether there is a magnetic object at the current location. When used in series, it can display the current location of the detected object.

[0070] Specifically, multiple logic circuit chips are connected in series, and the second level signal of the logic circuit chip at the upstream end is preset to a high level; the magnetic object moves along the arrangement direction of the logic circuit chips, the display driving module 3 of the logic circuit chip upstream of the magnetic object displays a first display signal, and the display driving module 3 of the logic circuit chip downstream of the magnetic object displays a second display signal.

[0071] Specifically, multiple chips are connected in series via pin 1 51 and pin 4 54 , pin 1 51 is used to receive the identification signal of the previous chip; pin 4 54 is used to output the identification signal to the next chip.

[0072] Specifically, the position output module in this embodiment is also packaged in the logic circuit chip and connected to the magnetoresistive sensor 1 , and is used to receive the first level signal of the magnetoresistive sensor 1 and output the first level signal to an external device.

[0073] Specifically, the position output module is an open collector output switch, which can be used as a switch externally, and can be connected to a relay, sound, or photoelectric alarm, or used in conjunction with other external circuits.

[0074] Specifically, when the received first level signal is at a high level, the collector output is disconnected, and the circuit corresponding to the chip is not turned on; when the received first level signal is at a low level, the collector output is turned on, and the circuit corresponding to the chip is turned on accordingly.

[0075] like Figure 1 As shown, in the embodiment of the present invention, the model of the logic circuit chip is LT-5040.

[0076] Specifically, LT-5040 is an omnipolar magnetic switch that integrates tunnel magnetoresistive sensor and CMOS technology and is developed for high-sensitivity, high-speed, low-power and high-precision applications. LT-5040 uses a high-precision push-pull half-bridge TMR magnetic sensor and CMOS integrated circuit, including a TMR voltage generator, a comparator, a Schmitt trigger and a CMOS output circuit, which can convert the changing magnetic field signal into a digital voltage signal output. LT-5040 provides a temperature-compensated power supply through an internal voltage regulator and allows a wide operating voltage range. LT-5040 has unique position identification and output functions. LT-5040 has a powerful current output to drive the LED display. LT-5040 has low voltage operation, microampere-level power supply current, high response frequency, wide operating temperature range, and excellent anti-external magnetic interference characteristics. It has become an ideal choice for many low-power and high-performance applications. LT-5040 adopts SO-8 packaging.

[0077] Embodiment 1

[0078] like Figure 2 As shown, in this embodiment, a working process of the above-mentioned logic circuit chip is provided.

[0079] Specifically, the color lights selected in the embodiment of the present invention are red and green LED lights; the sensor selected is a tunnel magnetoresistive sensor.

[0080] Specifically, the current mainstream magnetic sensor is still a semiconductor Hall device, but it has the disadvantages of low sensitivity, susceptibility to stress and temperature, low response frequency and high power consumption. The use of tunnel magnetoresistive sensors can improve the above disadvantages.

[0081] Specifically, when the chip is used alone and no magnetic object is detected, pin 1 is preset to a high level, the digital signal input to the identification and locking module is 1, and the digital signal input to the identification and locking module by the tunnel magnetoresistive sensor is also 1. The identification module uses a dedicated logic circuit. When all the received digital signals are 1, the digital signal output by the identification and locking module is also 1, and the red light is on.

[0082] Specifically, when a magnetic object is detected, the digital signal input from pin 1 to the identification and locking module is 1, the tunnel magnetoresistive sensor senses the magnetic signal, and the output changes from high level to low level, and the digital signal input to the identification and locking module is 0. When the dedicated logic circuit receives at least one digital signal of 0, the digital signal output by the identification and locking module is 0, and the green light is on.

[0083] Specifically, the user can judge whether there is a magnetic object at the position corresponding to the chip by observing the color of the signal light of the display driving module.

[0084] Specifically, when the chips are used in series, the chips can be arranged sequentially on the circuit board, with pin 1 51 connected to pin 4 54 of other chips, and pin 4 54 connected to pin 1 51 of other chips, and multiple chips can be connected in series one by one.

[0085] Specifically, when the magnetic object does not pass over the chip, the default signal of pin 1 51 is 1, and the digital signal input by the tunnel magnetoresistive sensor to the identification and locking module is also 1. The identification module uses a dedicated logic circuit. When the received digital signals are all 1, the digital signal output by the identification and locking module is also 1, and the digital signal output by the identification and locking module to the display driver module is 1. At this time, the red light is on, and the digital signal output by the identification and locking module to pin 4 54 is 1, and the digital signal output by pin 4 54 to pin 1 51 of the chip connected in series with it is 1, so that the digital signal output by pin 1 51 of the chip connected in series with it to the identification and locking module is also 1, and the cycle repeats, so that the displays of the chips connected in series all turn red.

[0086] Specifically, when a magnetic object sweeps over the chips connected in series and the magnetic object stays over a certain chip, the change of the internal signal of the chip is as follows: pin 1 51 receives a digital signal 1 of the chip that has not been swept by the magnetic object, and the digital signal output by pin 1 51 to the identification and locking module is 1. The tunnel magnetoresistive sensor senses the magnetic signal and the output changes from a high level to a low level, and the digital signal input to the identification and locking module is 0. When the dedicated logic circuit receives at least one digital signal of 0, the digital signal output by the identification and locking module is 0, and the digital signal output by the identification and locking module to the display driver module is 0. At this time, the green light is on, and the digital signal output by the identification and locking module to pin 4 54 is 0, and the digital signal output by pin 4 54 to pin 1 51 of the chip connected in series with it is 0, so that the digital signal output by pin 1 51 of the chip connected in series with pin 4 54 is 0 to the identification and locking module, and the signal output by the identification and locking module to the display driver module is 0. At this time, the green light is on, and taking the chip where the magnetic object stays as the dividing line, all chips in the direction of the series connection with pin 4 54 of the chip are displayed in green; and all chips in the direction of the series connection with pin 1 51 of the chip are displayed in red.

[0087] Specifically, the user can determine whether a magnetic object is passing by and where the magnetic object is located by observing the dividing point between the red light and the green light of the series-connected chip.

[0088] Specifically, when the tunnel magnetoresistive sensor senses the magnetic signal, the output changes from a high level to a low level, and the digital signal input to the position module is 0. At this time, the position output module switch is turned on.

[0089] Embodiment 2

[0090] like Figure 3As shown, a logic circuit chip of the present invention also provides a position output module, which connects multiple chips in series through 2 pins of the chip, sets a resistor between the 2 pins of two adjacent chips in series, and connects the 2 pins of the chips in series to an external display device.

[0091] Specifically, the display device provides a constant current to the resistor string, and the constant current flows through the resistor string to generate a voltage signal. When a magnetic object is detected, the position output module receives a first level signal of a low level. At this time, the collector switch of the position output module of the chip that detects the magnetic object is turned on, so that a loop is formed between the constant current provided by the display device and the chip. The voltage signal measured by the display device is the voltage signal generated by the resistance between the constant current input position and the chip that detects the magnetic object. The exact position of the magnetic object is known through an algorithm.

[0092] The display device can be set up in an off-site control room, and the exact location of the magnetic object can be obtained based on the measured voltage signal. The display device can also be set up on-site, and the reading and the color of the display light can be combined to determine the location of the object. The display device reading and the color of the display light can corroborate each other.

[0093] Specifically, multiple resistors are connected in series to form a resistor string, and the display device provides a constant current for the resistor string. The input position of the constant current is the upstream of the resistor string, and the output position is the downstream of the resistor string. Multiple chips are arranged in sequence along the direction of current flow, and the 2 pins of each chip are connected to the resistor string in sequence. The access position of the 2 pins of each chip and the side close to the upstream of the resistor string correspond to a resistor respectively, that is, at least a resistor is set between the chip closest to the upstream of the resistor string and the input position of the constant current, and a resistor is set between two adjacent chips. The 3 pins of each series chip are connected to the ground wire respectively, and the display device is used to obtain the voltage signal between the upstream of the resistor string and the ground wire.

[0094] Thus, the detection method of the display device is:

[0095] When the magnetic object is not detected, the first level signal received by the position output module of each chip is high level, the collector outputs are disconnected, and the voltage signal detected by the display device is the voltage signal of all resistor strings as a whole. At this time, the voltage signal that the display device can detect is the maximum value.

[0096] When a magnetic object is detected by a chip, the first level signal received by the position output module of the chip changes from high level to low level, the collector output of this chip is turned on, the first level signal received by the position output modules of the remaining chips is still high level, and the collector outputs of the remaining chips are disconnected.

[0097] At this time, a loop is formed between the chip that detects the magnetic object and the resistor upstream of the connection position of the chip, and the resistor string downstream of the chip connection position is not in the loop. The voltage signal detected by the display device is a voltage signal generated by a constant current flowing through the resistor upstream of the connection position of the chip that detects the magnetic object. Therefore, the exact position of the magnetic object can be determined based on the detected voltage signal.

[0098] In this embodiment, when the magnetic object moves from the upstream side close to the resistor string to the downstream side close to the resistor string, the voltage signal measured by the display device gradually decreases.

[0099] Specifically, in Figure 3 When a magnetic object passes from top to bottom, the voltage signal measured by the display device gradually decreases, and the exact position of the magnetic object can be obtained through an algorithm.

[0100] The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above in the preferred embodiment, it is not used to limit the present invention. Any technician familiar with this patent can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical content suggested above without departing from the scope of the technical solution of the present invention. The implementation scheme in the above embodiment can be further combined or replaced. However, any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the solution of the present invention.

Claims

1. A logic circuit chip, comprising a chip body, characterized in that: Also included are the following encapsulated in the chip body: A magnetoresistive sensor (1) generates a first level signal according to the position of the magnetic object; A position identification and locking module (4) is connected to the magnetoresistive sensor (1), and is used to receive a first level signal from the magnetoresistive sensor (1) and a second level signal input from the outside, and to generate a display signal according to the first level signal and the second level signal; The display driving module (3) is connected to the position identification and locking module (4) and outputs a driving display according to a display signal.

2. A logic circuit chip according to claim 1, characterized in that: When the first level signal and the second level signal are both at high levels, the position identification and locking module (4) generates a first display signal; when the first level signal and / or the second level signal are at low levels, the position identification and locking module (4) generates a second display signal.

3. A logic circuit chip according to claim 2, characterized in that: When the magnetoresistive sensor (1) does not detect a magnetic object, the first level signal is a high level; When the magnetoresistive sensor (1) detects a magnetic object, the first level signal changes from a high level to a low level.

4. A logic circuit chip according to claim 2, characterized in that: The display driving module (3) is used to drive the display LED lamp. When a first display signal is received, the output drives the first color lamp to light up. When a second display signal is received, the output drives the second color lamp to light up.

5. A logic circuit chip according to any one of claims 2 to 4, characterized in that: The logic circuit chip is used alone, and the second level signal is a preset high level signal; or, A plurality of logic circuit chips are connected in series, and the second level signal is an output signal of adjacent logic circuit chips.

6. A logic circuit chip according to claim 5, characterized in that: A plurality of logic circuit chips are connected in series, and the second level signal of the logic circuit chip at the upstream end is preset to a high level; The magnetic object moves along the arrangement direction of the logic circuit chips, the display driving module (3) of the logic circuit chip upstream of the magnetic object displays a first display signal, and the display driving module (3) of the logic circuit chip downstream of the magnetic object displays a second display signal.

7. A logic circuit chip according to claim 6, characterized in that: It also includes a position output module, which is packaged inside the chip and connected to the magnetoresistive sensor (1) and is used to receive a first level signal from the magnetoresistive sensor (1); The position output module is an open collector output switch.

8. The logic circuit chip according to claim 7, characterized in that: When the received first level signal is at a high level, the collector output is disconnected; When the received first level signal is at a low level, the collector output is turned on.

9. The logic circuit chip according to claim 7, characterized in that: The chip adopts so-8-pin package, which are: Pin 1 (51), used for receiving a second level signal input from the outside; Pin 2 (52), position output module, output signal +; Pin 3 (53), position output module, output signal -; Pin 4 (54), used for outputting a second level signal to an adjacent logic circuit chip; Pin 5 (55), power supply; Pin 6 (56) / Pin 7 (57), respectively outputs to drive the first color light or the second color light; Pin 8 (58), power supply.

10. A logic circuit chip according to any one of claims 1 to 4, characterized in that: The magnetoresistive sensor (1) is a TMR magnetoresistive sensor.

Images