Non-contact segmented continuous absolute position sensing system and method for passive scales

Abstract

The application discloses a non-contact segmented continuous absolute position detection system of a passive ruler, which comprises a passive ruler group, a mapper and a point-line collector, the mapper and the point-line collector are arranged on a measured device, the passive ruler group comprises multiple passive rulers arranged along the length direction of the motion track of the measured device, and gaps exist between the two adjacent passive rulers, the mapper comprises a wireless power supply sending coil and an address information receiving coil, the point-line collector comprises a point-line collection processor, each passive ruler comprises a wireless power supply receiving coil, an address information sending coil and a passive ruler processor, the distance measurement part of the application adopts a standard segmented passive combination structure, so that the damage or failure of a single steel ruler does not affect the system operation, the application can provide accurate positioning, prevent the mobile vehicle from deviating or derailing due to exceeding the limit position, prolong the service life of the device, realize accurate operation, optimize the process, reduce the error probability, and improve the work efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of locomotive running track and position monitoring, in particular to a non-contact segmented continuous absolute position detection system and method of passive measuring ruler. BACKGROUND

[0002] With the rapid development of industrial automation, various types of mechanical equipment in various industries have the demand for automatic control, especially for some equipment in harsh environments, such as reversible belt unloading vehicles, heavy unloading vehicles, stacker-reclaimers and cranes. In order to achieve automatic control, the first requirement is to obtain accurate mechanical walking position information. At present, the mechanical walking position information is generally obtained by using a coding cable.

[0003] The traditional coding cable has many shortcomings:

[0004] (1) The coding cable, which is the positioning basis, is entirely prepared and used, and cannot be segmented. The damage of any position will cause the system to be completely invalid and cannot be isolated. It is very inconvenient to maintain and replace in the later period.

[0005] (2) In the entire space extended by the coding cable, various types of electrical interference, industrial interference, phase mutual inductance interference, parallel crosstalk, multi-station interference, and eddy current interference of a large range of metal coverings are all superimposed and introduced, which cannot be isolated and affect the reliability and positioning accuracy of the system. One of the manifestations is positioning error or skip word.

[0006] (3) Since the coding cable itself cannot be spare parts, the cable fault recovery needs to contact the manufacturer, explain the fault phenomenon, and then the technical personnel carry spare parts, tools and instruments to the scene for maintenance. The whole process is troublesome and time-consuming, and the system cannot operate during this period.

[0007] (4) In the production link of the manufacturer, most manufacturers still use manual cable preparation methods, which often occur in preparation errors. In addition, the length of each application site is different, and the production management is troublesome.

[0008] (5) It cannot be made into a universal spare part and must be customized. SUMMARY

[0009] The purpose of the present application is to provide a non-contact segmented continuous absolute position detection system and method of passive measuring ruler. The ranging part of the present application adopts a standard segmented passive combination structure, so that the damage or failure of a single measuring ruler does not affect the system operation. The present application can provide accurate positioning, prevent mobile locomotives from deviating or exceeding the limit position and derailing, prolong the service life of the equipment, realize accurate operation, optimize the process, reduce the error probability, and improve the work efficiency.

[0010] In order to achieve the purpose, the non-contact segmented continuous absolute position detection system of the passive ruler designed by the application comprises a passive ruler group, a mapper and a point line collector, the mapper and the point line collector are arranged on a measured device, the passive ruler group comprises a plurality of passive rulers arranged along the length direction of the motion track of the measured device, the mapper comprises a wireless power supply transmitting coil and an address information receiving coil, the point line collector comprises a point line collection processor, each passive ruler comprises a wireless power supply receiving coil, an address information transmitting coil and a passive ruler processor;

[0011] The point line collection processor is used for transmitting a wireless power supply signal through the wireless power supply transmitting coil, the power supply receiving coil of the passive ruler corresponding to the position of the mapper is used for receiving the power supply signal, and the passive ruler processor of the passive ruler is powered, the passive ruler processor transmits coil address information to the address information transmitting coil of the passive ruler, the address information transmitting coil wirelessly transmits the received coil address information, the address information receiving coil receives the coil address information and transmits the coil address information to the point line collection processor, and the point line collection processor calculates the position of the mapper relative to the passive ruler group according to the received coil address information.

[0012] The application has the following beneficial effects:

[0013] 1、The passive ruler group and the mapper in the application are used for non-contact detection, and the passive ruler group adopts a passive mode (without power supply). The mapper provides wireless power supply for the corresponding passive ruler. The mapper reads the address data output by the passive ruler through an internal coil group and calculates the corresponding address, so that accurate positioning of the mapper is realized, the measured device is prevented from deviating or exceeding the limit position, collision, derailment and other accidents are avoided, automatic production management of the measured device is ensured, the service life of the device is prolonged, accurate operation is ensured, the process is optimized, manual operation is reduced, and work efficiency is improved.

[0014] 2、The mapper adopts an active mode, and wireless power supply, activation of the passive ruler are performed in a specific mode and frequency. After being activated, the passive ruler transmits address signals in a specific code, mode and time sequence. The mapper collects and receives the address information, processes and analyzes the actual address, and transmits the actual address to the point line collector and displays the actual address. The point line collector can also output address signals to provide accurate positioning information.

[0015] 3、The passive ruler group adopts a segmented installation mode, and the length of each passive ruler is regular and fixed (in the embodiment, there are two specifications of 1 m and 2 m). The passive ruler group has the advantages of simple structure, durability, scale production, convenient transportation, easy installation, convenient maintenance and replacement, and the like. When a passive ruler in the system fails, the position data detection of the passive rulers before and after the passive ruler is not affected, and the operation of the system positioning is not affected. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 This is a schematic diagram of the present invention;

[0017] Figure 2 Installation diagram of the present invention;

[0018] Figure 3 This is a side view of the structure of the present invention;

[0019] Figure 4 This is a block diagram illustrating the principle of the passive measuring scale and mapper in this invention.

[0020] Figure 5 Diagram showing coil polarity combinations;

[0021] Figure 5 The receiving coil multiplexes six sets of data and address information within the mapper; the total area of ​​the positive and negative polarities within each set is equal. Figure 5 On the right, the uncolored parts have the same polarity, and the colored parts have the same polarity; the polarities of the uncolored and colored parts are opposite, making the sum of the induced electromotive forces generated by the WPT coil and external interference zero. Figure 5 On the left is the winding method for 6 sets of coils. R0 is the reference line, G3, G2, G1 and G0 are measuring coils of 1600mm, 800mm, 400mm and 200mm respectively, and L0 is the precision coil that works with G0.

[0022] Among them, 1—passive measuring scale group, 1.1—passive measuring scale, 1.2—wireless power supply receiving coil, 1.3—address information transmitting coil, 1.4—passive measuring scale processor, 1.5—first electrical parameter isolation module, 1.6—boost rectifier module, 1.7—efficiency adjustment module, 1.8—signal conditioning module, 1.9—second electromagnetic isolation module, 1.10—second drive module, 2—mapper, 2.1—wireless power supply transmitting coil, 2.2—address information receiving coil, 2.3—mapping processor, 2.4—waveform processing module, 2.5—first electromagnetic isolation module, 2.6—first drive module, 2.7—second electrical parameter isolation module, 2.8—filtering module, 2.9—signal amplification module, 2.10—analog-to-digital conversion module, 2.11—point and line acquisition device, 3—decoding analyzer, 4—PLC. Detailed Implementation

[0023] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0024] like Figures 1-5The non-contact segmented continuous absolute position detection system of the passive scale shown comprises a passive scale group 1, a mapper 2 and a point line collector 2.11, the passive scale group 1 is arranged along the length direction of the movement track of the measured device, the passive scale group 1 is parallel to the movement track of the measured device (the passive scale group 1 can be arranged on both sides, the bottom or the top of the track), the mapper 2 and the point line collector 2.11 are fixed on the measured device, the passive scale group 1 comprises a plurality of passive scales 1.1, the adjacent two passive scales 1.1 are closely arranged with or without gaps (the installation gap is determined by the specific installation environment between the two scales. The gap in this example can be between 0-100mm, and the recommended gap is 20mm. When measuring the area, the scale can be installed alone), the mapper 2 comprises a wireless power supply transmitting coil 2.1 and an address information receiving coil 2.2, the point line collector 2.11 comprises a point line collection processor 2.3, each passive scale 1.1 comprises a wireless power supply receiving coil 1.2, an address information transmitting coil 1.3 and a passive scale processor 1.4, in this embodiment, the wireless power supply transmitting coil 2.1 is a group of coils, the address information receiving coil 2.2 is six groups of coils, the six groups of address information receiving coils are arranged side by side, the wireless power supply receiving coil 1.2 has four groups of coils, the four groups of wireless power supply receiving coils are arranged side by side, the address information transmitting coil 1.3 has four groups of coils, and the four groups of address information transmitting coils are arranged side by side.

[0025] The point line collection processor 2.3 is used for transmitting a wireless power supply signal through the wireless power supply transmitting coil 2.1, the power supply receiving coil 1.2 of the passive scale 1.1 corresponding to the position of the mapper 2 is used for receiving the power supply signal and powering the passive scale processor 1.4 of the passive scale 1.1, the passive scale processor 1.4 sends the coil address information to the address information transmitting coil 1.3 of the passive scale 1.1, the address information transmitting coil 1.3 wirelessly transmits the received coil address information, the address information receiving coil 2.2 receives the above coil address information and sends it to the point line collection processor 2.3, and the point line collection processor 2.3 calculates the position of the mapper 2 relative to the passive scale group 1 according to the received coil address information.

[0026] In the embodiment, the passive ruler group 1 is fixedly installed beside the track of the mobile running vehicle through the stand, the bolt and the clamp, the mapper 2 is fixed on the vehicle through the support and the bolt, the passive ruler group 1 and the mapper 2 are non-contact detection, the interval distance is 120mm±50mm, the up-down position is the center coincidence ±50mm, the single length of the passive ruler 1.1 is 1980mm (1980*108*28), the segmented combination arrangement is adopted, the interval between the adjacent two segments can be 0-100mm, the detection length can reach 1km, the passive ruler group 1 adopts the passive mode (without power supply), the internal array coil absorbs the energy from the mapper 2 to supply power to the internal micro-power consumption main circuit board and feedback the address signal, the mapper 2 adopts the active mode; when the mapper 2 gradually moves across the joint of the passive ruler group 1 during the running of the mobile vehicle, the center position of the mapper 2 is moved to the joint of the adjacent passive ruler 1.1, the length can cover 800mm at both ends of the two adjacent passive rulers 1.1, so that the energy absorption of the adjacent passive ruler 1.1 and the address information data detection and collection of the mapper 2 can be seamlessly connected and continuously without breakpoint. A magnetic sticker is installed in the mapper cover to resist the mutual interference of external strong magnetic fields. The shape size, internal structure and components of each segment of the passive ruler group 1 are the same; each group of address information sending coils 1.3 in each passive ruler 1.1 realizes unique coding through the passive ruler processor 1.4, realizes long-distance displacement detection, and when a certain segment of the passive ruler 1.1 in the system fails, the position data detection of the front and rear passive rulers 1.1 is not affected, and the operation of the system positioning is not affected.

[0027] In the technical scheme, the point-line collection processor 2.3 is further used for sending handshake communication information and coil address injection information through the wireless power supply sending coil 2.1, the power supply receiving coil 1.2 of the passive ruler 1.1 corresponding to the position of the mapper 2 is used for receiving the handshake communication information, so that the point-line collection processor 2.3 and the corresponding passive ruler processor 1.4 establish handshake communication, and the passive ruler processor 1.4 is used for generating the coil address information of the passive ruler 1.1 according to the received coil address injection information.

[0028] Each passive ruler 1.1 has a plurality of address information sending coils 1.3 arranged in sequence along the direction of the motion trail of the measured device, and the passive ruler processor 1.4 generates coil address information corresponding to each address information sending coil 1.3 according to the received coil address injection information, and the passive ruler processor 1.4 sends the coil address information corresponding to each address information sending coil 1.3 to the corresponding address information sending coil 1.3 in time sequence cycle, and each address information sending coil 1.3 sends the coil address information obtained by itself. The process of generating the coil address information corresponding to each address information sending coil 1.3 according to the received coil address injection information by the above-mentioned passive ruler processor 1.4 is only needed when the passive ruler group 1 is initialized, and in the subsequent use process, the mapper only needs to wirelessly power the corresponding passive ruler.

[0029] In the above technical solution, the handshake communication information and the coil address injection information are modulated into the baseband power supply signal by the point-line collection processor 2.3, and the modulation mode is amplitude and frequency composite modulation. By adopting the method of combining amplitude modulation and frequency modulation, in this example, 2PSK is combined with 2ASK, so that a balance between system complexity, cost, anti-interference performance and error rate can be achieved.

[0030] In the above technical solution, the point-line collector 2.11 further includes a waveform processing module 2.4, a first electromagnetic isolation module 2.5 and a first driving module 2.6, the waveform processing module 2.4 is used to convert the handshake communication information, the coil address injection information and the modulation signal of the baseband power supply signal into a differential modulation signal with dead zone protection, so as to avoid short circuit of the subsequent power device, so that the upper arm and the power device of the H-bridge type power circuit will not be opened at the same time, and the differential modulation signal with dead zone protection is transmitted to the driving module 2.6 after being isolated by the first electromagnetic isolation module 2.5, the isolation mainly plays a protection role of the hardware circuit, and the totem column driving protection is realized, and the first driving module 2.6 is used to power amplify the differential modulation signal with dead zone protection after electromagnetic isolation, and in this example, the amplification is to 30W, and the wireless power supply sending coil 2.1 wirelessly sends the power amplified differential modulation signal. In the regular use process after the initialization of the passive ruler group 1, the point-line collection processor 2.3 directly outputs the power supply signal, the power supply signal is transmitted to the driving module 2.6 after being isolated by the first electromagnetic isolation module 2.5, the first driving module 2.6 power amplifies the isolated power supply signal, and in this example, the amplification is to 30W, and the wireless power supply sending coil 2.1 wirelessly sends the power amplified power supply signal by using the LC resonance power supply principle.

[0031] In the above technical solution, each passive ruler 1.1 further comprises a first electrical parameter isolation module 1.5, a boost rectification module 1.6, an efficiency adjustment module 1.7, and a signal conditioning module 1.8. The first electrical parameter isolation module 1.5 is used to isolate the differential modulation signal received by the wireless power receiving coil 1.2 in terms of electrical parameters. In the LC resonance circuit, changes in the capacitance value or inductance value of the entire loop will change the resonance frequency. If directly connected, the processing circuit in the later stage will inevitably introduce changes in electrical parameters (capacitance, inductance, impedance), thereby causing the LC resonance to be off-tuned, making the circuit unable to work normally. Therefore, electrical parameter isolation is needed. The boost rectification module 1.6 is used to boost and rectify the differential modulation signal after electrical parameter isolation. Due to the fact that the strength of electromagnetic induction is roughly inversely proportional to the 3rd power of the distance between the two, a large dynamic range is needed to adapt to the working environment on site. In the present application, the full-bridge rectification boosts by 3 times. The efficiency adjustment module 1.7 is used to adjust the efficiency of the differential modulation signal after boost rectification. All diodes have a forward voltage drop. In the present application, the voltage received originally is small, and needs to be boosted. Even so, the loss of rectification efficiency caused by the forward voltage drop of the rectifier tube cannot be ignored. The valley-fill circuit is used to improve the final efficiency of the rectified output. The signal conditioning module 1.8 is used to condition the differential modulation signal after electrical parameter isolation (due to being in a strong electromagnetic field of WPT and other interference on site, basic processing such as filtering, limiting, and amplifying is needed). The passive ruler processor 1.4 is used to demodulate the envelope frequency and amplitude of the differential modulation signal after efficiency adjustment to obtain the power supply signal, and uses the power supply signal to power the passive ruler processor 1.4. The passive ruler processor 1.4 is also used to demodulate the differential modulation signal after signal conditioning to obtain handshake communication information and coil address injection information. The point-line acquisition processor 2.3 establishes handshake communication with the corresponding passive ruler processor 1.4. The passive ruler processor 1.4 is used to generate the coil address information of the passive ruler 1.1 according to the received coil address injection information. In the regular use process after the initialization of the passive ruler group 1, the first electrical parameter isolation module 1.5 isolates the power supply signal received by the wireless power receiving coil 1.2 in terms of electrical parameters. The boost rectification module 1.6 is used to boost and rectify the power supply signal after electrical parameter isolation. The efficiency adjustment module 1.7 is used to adjust the efficiency of the power supply signal after boost rectification. The passive ruler processor 1.4 uses the power supply signal after efficiency adjustment to power the passive ruler processor 1.4. The passive ruler processor 1.4 outputs the coil address information of the passive ruler 1.1 predicted during initialization.

[0032] In the technical solution, each passive ruler 1.1 further comprises a second electromagnetic isolation module 1.9 and a second driving module 1.10, the coil address information output by the passive ruler processor 1.4 is amplified in power by the second driving module 1.10 after passing through the second electromagnetic isolation module 1.9, and the address information transmitting coil 1.3 transmits the coil address information after power amplification.

[0033] In the technical solution, the point-line collector 2.11 further comprises a second electrical parameter isolation module 2.7, a filtering module 2.8, a signal amplification module 2.9 and an analog-digital conversion module 2.10, the address information receiving coil 2.2 receives the coil address information, the second electrical parameter isolation module 2.7 performs electrical parameter isolation (isolates the high voltage of the analog circuit and the weak current of the digital circuit) on the coil address information, the filtering module 2.8 performs filtering processing (the front stage is mainly BPF band-pass filtering, and the filtering is performed on the device itself WPT interference and other interference in the field. The positioning and communication signals are reserved) on the coil address information after electrical parameter isolation, the signal amplification module 2.9 performs signal amplification processing on the coil address information after filtering processing, the signal amplification is used for collection and analysis, and in this embodiment, the signal amplification is divided into three levels of 40dB, 46dB and 52dB, the analog-digital conversion module 2.10 converts the coil address information after signal amplification into a digital signal, and the point-line collection processor 2.3 calculates the position of the mapper 2 relative to the passive ruler group 1 according to the coil address digital information.

[0034] In the technical solution, the point-line collection processor 2.3 calculates the position of the mapper 2 relative to the passive ruler group 1 according to the coil address digital information by using a signal polarity combination method. The coil polarity combination is as follows Figure 5 In this embodiment, in addition to the 1st group of WPT coils in the mapper, there are 6 groups of data and address information multiplexing receiving coils. The 6 groups of coils are independently programmed, each group has different polarity area distribution and quantity, and the total area of the opposite polarity in each group is equal, so that the total induced electromotive force from the external interference and the WPT coil in the mapper is zero. After the passive ruler sends the address information, the passive ruler will be received by the 6 groups of coils simultaneously, and different polarity and amplitude combination results will be generated. Further, in this embodiment, the signal received by the 6 groups of coils has 16 kinds of polarity combinations, corresponding to 16 different relative positions with a unit of 100mm, and further, the fine position within 100mm can be obtained according to the polarity and amplitude of the G0 and L0 coils.

[0035] In the technical solution, the decoding analyzer 3 and the PLC 4 (optional) are arranged on the vehicle cabinet or the ground cabinet, the decoding analyzer 3 is used to collect and analyze the signals received by the six groups of coils, analyze the polarity and amplitude combination, and combine the pre-programmed coils to obtain the number of the measured ruler and the position of the measured ruler relative to the mapper, so as to obtain the absolute position of the mapper, and the PLC 4 (optional) is used to transmit the obtained absolute position value to the application layer.

[0036] A non-contact segmented continuous absolute position detection method of a passive ruler, comprising the following steps:

[0037] Step 1: The point line collection processor 2.3 transmits a wireless power supply signal through the wireless power supply transmission coil 2.1.

[0038] Step 2: The power supply receiving coil 1.2 of the passive ruler 1.1 corresponding to the position of the mapper 2 receives the power supply signal, and powers the passive ruler processor 1.4 of the passive ruler 1.1.

[0039] Step 3: The passive ruler processor 1.4 sends the coil address information to the address information transmission coil 1.3 of the passive ruler 1.1, and the address information transmission coil 1.3 wirelessly transmits the received coil address information.

[0040] Step 4: The address information receiving coil 2.2 receives the above-mentioned coil address information and sends it to the point line collection processor 2.3, and the point line collection processor 2.3 calculates the position of the mapper 2 relative to the passive ruler group 1 according to the received coil address information.

[0041] The contents not described in detail in the specification belong to the prior art known to those skilled in the art.

Claims

1. A non-contact, segmented, continuous absolute position detection system for a passive measuring scale, characterized in that: It includes a passive measuring scale assembly, a mapper, and a point-line acquisition unit. The mapper and point-line acquisition unit are installed on the device under test. The passive measuring scale assembly includes multiple passive measuring scales arranged along the length of the movement trajectory of the device under test. The mapper includes a wireless power transmission coil and an address information receiving coil. The point-line acquisition unit includes a point-line acquisition processor. Each passive measuring scale segment includes a wireless power receiving coil, an address information transmission coil, and a passive measuring scale processor. The point-line acquisition processor transmits a wireless power supply signal via a wireless power supply transmitting coil. The power supply receiving coil of the passive measuring scale corresponding to the mapper's position receives the power supply signal and supplies power to the passive measuring scale processor of that passive measuring scale. The passive measuring scale processor sends the coil address information to the address information transmitting coil of the passive measuring scale. The address information transmitting coil wirelessly transmits the received coil address information. The address information receiving coil receives the above coil address information and sends it to the point-line acquisition processor. The point-line acquisition processor calculates the position of the mapper relative to the passive measuring scale group based on the received coil address information. The mapper has a WPT coil, a receiving coil that multiplexes data and address information. Each group of receiving coils is independently programmed, and each group of receiving lines has different polarity regions distributed and numbered. The total area of ​​opposite polarity regions in each group of receiving lines is equal, so that the sum of external interference and the induced electromotive force generated by the WPT coil is zero. After the passive measuring scale coil transmits the address information, it is simultaneously received by the receiving coil, generating different combinations of polarity and amplitude to obtain the precise position. Each passive measuring scale has multiple address information transmitting coils arranged sequentially along the movement trajectory of the device under test. During the initialization of the passive measuring scale group, the passive measuring scale processor generates coil address information corresponding to each address information transmitting coil based on the received coil address injection information. The passive measuring scale processor sends the coil address information corresponding to each address information transmitting coil to the corresponding address information transmitting coil in a time-sequential loop. Each address information transmitting coil sends the coil address information it has acquired. After the passive measuring scale group is initialized, the passive measuring scale processor outputs the coil address information of the passive measuring scale at the time of initialization. Each passive measuring scale also includes a first electrical parameter isolation module, a boost rectification module, and an efficiency adjustment module. The first electrical parameter isolation module performs electrical parameter isolation on the differential modulation signal received by the wireless power supply receiving coil. The boost rectification module boosts and rectifies the differential modulation signal after electrical parameter isolation. The efficiency adjustment module adjusts the efficiency of the boosted and rectified differential modulation signal. The passive measuring scale processor demodulates the efficiency-adjusted differential modulation signal to obtain the power supply signal. The passive measuring scale processor demodulates the signal-conditioned differential modulation signal to obtain handshake communication information and coil address injection information. The point and line acquisition processor establishes handshake communication with the corresponding passive measuring scale processor. The passive measuring scale processor generates the coil address information of the passive measuring scale based on the coil address injection information.

2. The non-contact segmented continuous absolute position detection system for a passive measuring scale according to claim 1, characterized in that: The point-line acquisition processor is also used to send handshake communication information and coil address injection information through a wireless power supply transmitting coil. The power supply receiving coil of the passive measuring scale corresponding to the mapper position is used to receive the handshake communication information, so that the point-line acquisition processor and the corresponding passive measuring scale processor establish handshake communication. The passive measuring scale processor is used to generate the coil address information of the passive measuring scale according to the received coil address injection information.

3. The non-contact segmented continuous absolute position detection system for a passive measuring scale according to claim 1, characterized in that: The point-to-line acquisition processor is used to modulate the handshake communication information and coil address injection information into the baseband power supply signal, and the modulation method is amplitude and frequency composite modulation.

4. The non-contact segmented continuous absolute position detection system for a passive measuring scale according to claim 3, characterized in that: The point-line acquisition device further includes a waveform processing module, a first electromagnetic isolation module, and a first driving module. The waveform processing module is used to convert the handshake communication information, coil address injection information, and baseband power supply signal into a differential modulation signal with dead-time protection. The differential modulation signal with dead-time protection is isolated by the first electromagnetic isolation module and then sent to the driving module. The first driving module is used to amplify the power of the electromagnetically isolated differential modulation signal with dead-time protection. The wireless power supply transmitting coil wirelessly transmits the amplified differential modulation signal.

5. The non-contact segmented continuous absolute position detection system for a passive measuring scale according to claim 1, characterized in that: Each passive measuring scale also includes a second electromagnetic isolation module and a second drive module. The coil address information output by the passive measuring scale processor is amplified by the second drive module after passing through the second electromagnetic isolation module, and the address information transmitting coil transmits the amplified coil address information.

6. The non-contact segmented continuous absolute position detection system for a passive measuring scale according to claim 5, characterized in that: The point-line acquisition device also includes a second electrical parameter isolation module, a filtering module, a signal amplification module, and an analog-to-digital conversion module. The address information receiving coil receives the aforementioned coil address information. The second electrical parameter isolation module performs electrical parameter isolation on the coil address information. The filtering module performs filtering on the electrically isolated coil address information. The signal amplification module performs signal amplification on the filtered coil address information. The analog-to-digital conversion module converts the signal-amplified coil address information into a digital signal. The point-line acquisition processor calculates the position of the mapper relative to the passive measuring scale group based on the digital information of the coil address.

7. The non-contact segmented continuous absolute position detection system for a passive measuring scale according to claim 1 or 6, characterized in that: The point-line acquisition processor calculates the position of the mapper relative to the passive measuring scale group based on the coil address digital information and the signal polarity combination method.

8. The non-contact segmented continuous absolute position detection method for a passive measuring scale according to claim 1, characterized in that, It includes the following steps: Step 1: The point and line acquisition processor transmits a wireless power supply signal via a wireless power supply transmitting coil; Step 2: The power supply receiving coil of the passive measuring scale corresponding to the position of the mapper receives the power supply signal and supplies power to the passive measuring scale processor of the passive measuring scale. Step 3: The passive measuring scale processor sends the coil address information to the address information transmitting coil of the passive measuring scale, and the address information transmitting coil wirelessly transmits the received coil address information. Step 4: The address information receiving coil receives the above coil address information and sends it to the point and line acquisition processor. The point and line acquisition processor calculates the position of the mapper relative to the passive measuring scale group based on the received coil address information.

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