Isolated CAN device

Abstract

The present invention discloses an isolated CAN device (10'), comprising a primary side control circuit (20'), a secondary side control circuit (30'), a millimeter wave transmission circuit (40) which are integrated on a same chip; said primary side control circuit (20') is connected to said secondary side control circuit (30') via said millimeter wave transmission circuit (40); said millimeter wave transmission circuit (40) comprises a first millimeter wave transmission module (41) and a second millimeter wave transmission module (42); said secondary side control circuit (30') comprises a CAN module (31'); the output end of said CAN module (31'), said first millimeter wave transmission module (41) and a data output interface of said primary side control circuit (20') are connected in sequence;said secondary side control circuit (30') transmits the signals generated by said CAN module (31) via said first millimeter wave transmission module (41). Figure to be published with the abstract: Figure 2;

Description

Title of the invention: Isolated CAN device

[0001] The present invention relates to the technical field of integrated circuit design, and in particular to an isolated CAN device.

[0002] Isolated ADC is an analog-to-digital converter (ADC) with an electrical isolation function. It adds electrical isolation technology on the basis of the analog-to-digital converter, which is used to achieve electrical isolation between the input signals and the conversion circuit. Generally, a conventional ADC puts the analog input signals in direct contact with the conversion circuit, while an isolated ADC isolates the electrical connection between the input signals and the conversion circuit by means of an isolation device (such as an optocoupler, a magnetic coupler or a transformer).

[0003] This isolated design offers several advantages as follows:

[0004] (1) Electrical isolation: The isolated CAN achieves electrical isolation between the input signals and the conversion circuit to avoid interference caused by potential differences and electrical noise. This improves the stability, anti-interference ability and security of the system.

[0005] (2) Isolated status: Isolated CANs allow the transmission of signals between systems with different ground potentials or ground loops. This facilitates measurements and data transfer between control systems that need to be distributed across different sites.

[0006] (3) Safety protection: Since the input signals are isolated, the Isolated CAN provides a higher level of protection against direct transmission of high voltages or high currents into the backend electronics.

[0007] (4) Applications in complex environments: isolated CAN can be used for signal collection and control in complex industrial environments to prevent external interference from affecting system operation.

[0008] However, the existing isolated ADCs generally adopt the capacitive coupling means or the magnetic coupling means to realize the signal isolation; due to the limitations in technical principle, it is difficult to achieve a breakthrough in the signal transmission rate, transmission delay and signal jitter, resulting in the sampling rate of the isolated ADC being limited to about 20 MHz, which has become the technical bottleneck of the high-speed and high-precision ADC to realize the signal isolation.

[0009] The technical problem to be solved by the present invention is as follows: to provide an isolated CAN device making it possible to improve the sampling frequency and dynamic performance of the isolated CAN.

[0010] In order to solve the above-mentioned technical problem, the present invention adopts the following technical solution: an isolated CAN device comprising a primary-side control circuit and a secondary-side control circuit, and further comprising a millimeter-wave transmission circuit; said primary-side control circuit, said secondary-side control circuit and said millimeter-wave transmission circuit are integrated on a same chip; said primary-side control circuit is connected to said secondary-side control circuit via said millimeter-wave transmission circuit; said primary-side control circuit is connected to a processor via a data transmission interface; said millimeter-wave transmission circuit comprises a first millimeter-wave transmission module and a second millimeter-wave transmission module;said secondary side control circuit comprises a CAN module; the output end of said CAN module, said first millimeter wave transmission module and a data output interface of said primary side control circuit are connected in sequence; said secondary side control circuit transmits the signals generated by said CAN module via said first millimeter wave transmission module to said primary side control circuit; said primary side control circuit transmits the clock signals via said second millimeter wave transmission module to said CAN module of said secondary side control circuit.;

[0011] Wherein said second millimeter wave transmission module comprises: a second millimeter wave transmitter circuit, a second millimeter wave transmitter antenna, a second millimeter wave receiver circuit and a second millimeter wave receiver antenna; the input end of said second millimeter wave transmitter circuit is used for receiving clock signals and its output end is connected to said second millimeter wave transmitter antenna; the output end of said second millimeter wave receiver circuit is connected to the input end of said CAN module, its input end is connected to said second millimeter wave receiver antenna.

[0012] Wherein said first millimeter wave transmission module comprises: a first millimeter wave transmitter circuit, a first millimeter wave transmitter antenna, a first millimeter wave receiver circuit, and a first millimeter wave receiver antenna.

[0013] Wherein said primary side control circuit further comprises a digital signal processing module; the output end of said first circuit millimeter wave receiver is connected to the input end of said digital signal processing module, its input end is connected to said first millimeter wave receiving antenna; the output end of said digital signal processing module is connected to said processor via said data output interface; the input end of said first millimeter wave transmitter circuit is connected to the output end of said CAN module, its output end is connected to said first millimeter wave transmitter antenna.

[0014] Wherein said primary side control circuit comprises a data decoding module; said secondary side control circuit further comprises a data encoding module; the input end of said data decoding module is connected to the output end of said first millimeter wave receiver circuit, its output end is connected to said processor via said data output interface; the input end of said data encoding module is connected to the output end of said CAN module, its output end is connected to the input end of said first millimeter wave transmitter circuit; the input end of said first millimeter wave transmitter circuit is connected to the output end of said CAN module, its output end is connected to said first millimeter wave transmitter antenna.

[0015] Wherein the interface protocols and data output interfaces of said coding module and those of said decoding module are identical.

[0016] Wherein said millimeter wave transmission circuit is a millimeter wave transmission chip.

[0017] The beneficial effect of the present invention is that: said primary side control circuit and said secondary side control circuit are integrated on a single chip, and a processor is installed on the single chip, the control of said primary side control circuit is realized by said processor; it is provided at the same time that the communication between said primary side control circuit and said secondary side control circuit is realized via said millimeter wave transmission circuit, the requirement on the safety distance between said primary side control circuit and said secondary side control circuit is met by the isolation level of said millimeter wave transmission circuit;In addition, the isolation of the ADC is realized based on millimeter wave communication technology, which realizes a single-chip isolated ADC integrating power isolation, signal isolation and clock isolation, removing the limitations in terms of signal transmission rate and signal jitter, thus achieving a breakthrough of the isolated ADC in terms of sampling rate and dynamic performance.

[0018] [Fig.l] is a schematic view of the circuit structure of an isolated CAN device according to one embodiment of the present invention;

[0019] [Fig.2] is a schematic view of the circuit structure of an isolated CAN device according to another embodiment of the present invention;

[0020] [Fig.3] is a schematic view of the structure of a first kind of the circuit of a millimeter wave transmission module in an isolated CAN device according to an embodiment of the present invention;

[0021] [Fig.4] is a schematic view of the structure of a second kind of the circuit of a millimeter wave transmission module in an isolated CAN device according to an embodiment of the present invention.

[0022] Reference number shown in the figures:

[0023] isolated CAN device 10

[0024] primary side control circuit 20, 20'

[0025] data decoding module 21'

[0026] secondary side control circuit 30, 30'

[0027] CAN module 31

[0028] 32' data encoding module

[0029] millimeter wave transmission circuit 40

[0030] first millimeter wave transmission module 41

[0031] first millimeter wave transmitter circuit 411

[0032] first millimeter wave transmitting antenna 412

[0033] first millimeter wave receiver circuit 413

[0034] first millimeter wave receiving antenna 414

[0035] second millimeter wave transmission module 42

[0036] second millimeter wave transmitter circuit 421

[0037] second millimeter wave transmitting antenna 422

[0038] second millimeter wave receiver circuit 423

[0039] second millimeter wave receiving antenna 424

[0040] processor 50

[0041] In order to illustrate in detail the technical contents, the objectives achieved and the effects of the present invention, the following is described with reference to the embodiments and the accompanying drawings.

[0042] The above-mentioned isolated CAN device according to the present application can be applied in all isolation application fields requiring the CAN type products, such as automation control, scientific research equipment, LED lighting, industrial control equipment, communication equipment, will be illustrated by specific embodiments.

[0043] Referring to [Fig.l], an isolated CAN device 10, comprising a primary side control circuit 20 and a secondary side control circuit 30, a millimeter wave transmission circuit 40.

[0044] said primary side control circuit 20, said secondary side control circuit 30 and said millimeter wave transmission circuit 40 are integrated on the same chip.

[0045] Said primary side control circuit 20 is connected to said secondary side control circuit 30 via said millimeter wave transmission circuit 40.

[0046] Said primary side control circuit 20 is connected to a processor 50 via a data transmission interface (i.e., Data Output Interface).

[0047] To carry out millimeter wave transmission, in an optional embodiment, said millimeter wave transmission circuit 40 comprises a first millimeter wave transmission module 41 and a second millimeter wave transmission module 42.

[0048] Said secondary side control circuit 30 further comprises a CAN module 31; the output end of said CAN module 31, said first millimeter wave transmission module 41 and said data output interface of said primary side control circuit 20 are connected in sequence.

[0049] Said secondary side control circuit 30 transmits the signals generated by said CAN module 31 via said first millimeter wave transmission module 41 to said primary side control circuit 20; said primary side control circuit 20 transmits the clock signals via said second millimeter wave transmission module 42 to said CAN module 31 of said secondary side control circuit 30.

[0050] Concretely, said first millimeter wave transmission module 41 comprises: a first millimeter wave transmitter circuit 411, a first millimeter wave transmitter antenna 412, a first millimeter wave receiver circuit 413, and a first millimeter wave receiver antenna 414. Said second millimeter wave transmission module 42 comprises: a second millimeter wave transmitter circuit 421, a second millimeter wave transmitter antenna 422, a second millimeter wave receiver circuit 423 and a second millimeter wave receiver antenna 424.

[0051] said primary side control circuit 20 further comprises a digital signal processing module 21'.

[0052] The output end of said first millimeter wave receiving circuit 413 is connected to the input end of said digital signal processing module 21', its input end is connected to said first millimeter wave receiving antenna 414; the output end of said signal processing module digital 21' is connected to said processor 50 via said data output interface.

[0053] The input end of said first millimeter wave transmitter circuit 411 is connected to the output end of said CAN module 31, its output end is connected to said first millimeter wave transmitter antenna 412; the input end of said CAN module 31 is connected to a peripheral circuit via an analog signal input interface.

[0054] The input end of said second millimeter wave transmitter circuit 421 is used to receive the clock signals (i.e. the CLK signals), input by said peripheral circuit, its output end is connected to said second millimeter wave transmitter antenna 422.

[0055] the output end of said second millimeter wave receiving circuit 423 is connected to the input end of said CAN module 31, its input end is connected to said second millimeter wave receiving antenna 424.

[0056] As mentioned above, corresponding insulation strips are provided between said first millimeter wave transmitting antenna 412 and said first millimeter wave receiving antenna 414, and between said second millimeter wave receiving antenna 422 and said second millimeter wave transmitting antenna 424.

[0057] For said isolated CAN device according to the above-mentioned, said primary side control circuit 20 and said secondary side control circuit 30 are completely isolated via provided insulation strips, said second millimeter wave transmitter circuit 421 of said primary side control circuit 20 is used to input the clock signals and transmit the clock signals to said second millimeter wave receiving antenna 421 of said secondary side control circuit 30 via said second millimeter wave transmitting antenna 424 based on the millimeter wave signals, said second millimeter wave receiving circuit 423 transmits said clock signals to said CAN module 31 as a sampling clock for said CAN module 31.

[0058] Said CAN module 31 samples raw data in response to said sampling clock and generates corresponding digital signals after analog-to-digital conversion; said first millimeter wave transmitter circuit 411 receives the digital signals output by said CAN module 31 and transmits the digital signals to said first millimeter wave receiver antenna 414 of said primary side control circuit 20 via said first millimeter wave transmitter antenna 412 based on the millimeter wave signals, said first millimeter wave receiver circuit 413 transmits said digital signals to said digital signal processing module 21'.

[0059] Said digital signal processing module 21' processes said received digital signals and transmits them to said processor 50 for processing via said data output interface. More specifically, said digital signal processing module 21' performs an extraction filtering operation mainly for the code stream data and transmits the processed sampling results to said processor 50 via said data output interface.

[0060] Furthermore, in order to achieve data synchronization, said clock signals are also simultaneously transmitted to said digital signal processing module 21' as a reference clock.

[0061] In the present embodiment, said data output interface may be an interface such as SPI, I2C, LVDS, Parallel, etc., which may be chosen according to the requirements of said processor.

[0062] Since millimeter wave communication can achieve a maximum communication rate of 10 Gbps, the signal delay is less than 3nS, and the signal jitter can be controlled at the pS level; furthermore, by controlling the power, millimeter waves can easily achieve a centimeter-level communication distance, which greatly increases its isolation voltage resistance; based on the above characteristics, millimeter wave isolation can fully meet the signal requirements of high-speed and high-precision ADCs on the basis of implementing improved isolation.In addition, the speed advantage of millimeter wave isolation can greatly reduce the transformer size requirements of a DC-DC module, using an on-chip transformer can meet the requirements, so as to realize a single-chip isolated ADC solution containing power isolation, data isolation and clock isolation.

[0063] In the present embodiment, the signal transmission between said primary side control circuit 20 and said secondary side control circuit 30 is performed using said millimeter wave transmission circuit, since the signal transmission of said millimeter wave transmission circuit 40 is performed using millimeter waves, this plays a role in the spatial isolation between said primary side control circuit 20 and said secondary side control circuit 30, which greatly improves the signal transmission speed.

[0064] In another optional embodiment, said millimeter wave transmission circuit 40 is a millimeter wave transmission chip, which makes it possible to further reduce the size of the switching power supply thanks to the chip-based design, and to achieve a thin and lightweight design of the device.

[0065] Referring to [Fig.2], in an optional embodiment, said primary side control circuit 20' comprises a data decoding module 21'; said secondary side control circuit 30' further comprises a data encoding module 32'.

[0066] The input end of said data decoding module 21' is connected to the output end of said first millimeter wave receiver circuit 413, its output end is connected to said processor 50 via said data output interface.

[0067] The input end of said data coding module 32' is connected to the output end of said CAN module 31', its output end is connected to the input end of said first millimeter wave transmitter circuit 411.

[0068] For said isolated CAN device according to the above-mentioned, said primary side control circuit 20' and said secondary side control circuit 30' are completely isolated via provided insulation strips, said first millimeter wave transmitter circuit 411 of said primary side control circuit 20' is used to input the clock signals and transmit the clock signals to said first millimeter wave receiving antenna 414 of said secondary side control circuit 30' via said first millimeter wave transmitting antenna 412 based on the millimeter wave signals, said second millimeter wave receiving circuit 413 transmits said clock signals to said CAN module 31' as a sampling clock for said CAN module 31'.

[0069] Said CAN module 31' samples raw data in response to said sampling clock and generates corresponding digital signals after analog-to-digital conversion; said data encoding module 32' is used for receiving the digital signals generated by said CAN module 31' and encoding them to convert the data, in order to convert the data of the interfaces of different protocols into serial data. Said first millimeter wave transmitter circuit 411 receives the encoded signals output by said encoding module 32' and transmits the encoded signals to said first millimeter wave receiving antenna 414 of said primary side control circuit 20' via said first millimeter wave transmitting antenna 412 on the basis of the millimeter wave signals, said first millimeter wave receiving circuit 413 transmits said encoded signals to said decoding module 21'.

[0070] Said decoding module 21' processes said received coded signals, decodes the serial data into data corresponding to the communication protocol and transmits them to said processor 50 for processing via said data output interface.

[0071] In the present embodiment, the interface protocols and the data output interfaces of said coding module 32' and those of said decoding module 21' are identical.

[0072] Referring to [Fig.3], said millimeter wave transmitter circuit comprises a digital-to-analog converter, a first baseband amplifier, a first mixer, a first phase-locked loop, a first radio frequency power amplifier and a first filter;

[0073] Said first millimeter wave receiver circuit comprises a second filter, a second radio frequency power amplifier, a second mixer, a second phase-locked loop, a second baseband amplifier and an analog-to-digital converter;

[0074] The second input end of said first mixer is connected to the output end of said phase-locked loop, the output end is connected to the input end of said second radio frequency power amplifier;

[0075] the output end of said first radio frequency power amplifier is connected to the input end of said first filter;

[0076] the output end of said first filter is connected to said transmitting antenna;

[0077] the input end of said second filter is connected to said receiving antenna, the output end is connected to the first input end of said second mixer;

[0078] the second input end of said second mixer is connected to the output end of said second phase-locked loop, the output end is connected to the input end of said second baseband filter.

[0079] As mentioned above, said first millimeter wave transmitter circuit 411, said first millimeter wave receiver circuit 413, said second millimeter wave transmitter circuit 421 and said second millimeter wave receiver circuit 423 in the present embodiment all have the aforementioned circuit structures and there is no need to repeat them here.

[0080] Wherein, the output end of said second baseband filter is connected to the input end of said CAN module, the output end of said CAN module is connected to the first input end of said first mixer.

[0081] Referring to [Fig.4], said millimeter wave transmitter circuit comprises an oscillator, a modulator and a third radio frequency power amplifier;

[0082] said millimeter wave receiver circuit comprises a fourth radio frequency power amplifier and an envelope detector;

[0083] the output end of said oscillator is connected to the first input end of said modulator;

[0084] The second input end of said modulator is connected to said digital signal output interface, the output end is connected to the input end of said third radio frequency power amplifier;

[0085] the output end of said third radio frequency power amplifier is connected to said transmitting antenna;

[0086] the input end of said fourth radio frequency power amplifier is connected to said receiving antenna, the output end is connected to the input end of said envelope detector;

[0087] the output end of said envelope detector is connected to the input end of said CAN module.

[0088] As mentioned above, said first millimeter wave transmitter circuit 411, said first millimeter wave receiver circuit 413, said second millimeter wave transmitter circuit 421 and said second millimeter wave receiver circuit 423 in the present embodiment all have the aforementioned circuit structures and there is no need to repeat here.

[0089] In conclusion, the present invention provides an isolated CAN device, said primary side control circuit and said secondary side control circuit are integrated on a single chip, and a processor is installed on the single chip, the control of said primary side control circuit is realized by said processor; it is provided at the same time that the communication between said primary side control circuit and said secondary side control circuit is realized via said millimeter wave transmission circuit, the requirement on the safety distance between said primary side control circuit and said secondary side control circuit is met by the isolation level of said millimeter wave transmission circuit;In addition, the isolation of the ADC is realized based on millimeter wave communication technology, which realizes a single-chip isolated ADC integrating power isolation, signal isolation and clock isolation, removing the limitations in terms of signal transmission rate and signal jitter, thus achieving a breakthrough of the isolated ADC in terms of sampling rate and dynamic performance.

[0090] The foregoing are merely embodiments of the present invention and are not intended to limit the scope of the patent of the present invention, and all equivalent transformations using the specification of the present invention and the accompanying drawings, or directly or indirectly in the relevant technical fields, are included within the scope of the patent protection of the present invention.

Claims

Claims

1. An isolated CAN device (10), comprising a primary-side control circuit (20) and a secondary-side control circuit (30), characterized in that it further comprises a millimeter-wave transmission circuit (40); said primary-side control circuit (20), said secondary-side control circuit (30) and said millimeter-wave transmission circuit (40) are integrated on a single chip; said primary-side control circuit (20) is connected to said secondary-side control circuit (30) via said millimeter-wave transmission circuit (40); said primary-side control circuit (20) is connected to a processor (50) via a data transmission interface; said millimeter-wave transmission circuit (40) comprises a first millimeter-wave transmission module (41) and a second millimeter-wave transmission module (42);said secondary side control circuit (30) comprises a CAN module (31); the output end of said CAN module (31), said first millimeter wave transmission module (41) and said data output interface of said primary side control circuit (20) are connected in sequence; said secondary side control circuit (30) transmits the signals generated by said CAN module (31) via said first millimeter wave transmission module (41) to said primary side control circuit (20); said primary side control circuit (20) transmits the clock signals via said second millimeter wave transmission module (42) to said CAN module (31) of said secondary side control circuit (30).;

2. An isolated CAN device (10) according to claim 1, characterized in that said second millimeter wave transmission module (42) comprises: a second millimeter wave transmitter circuit (421), a second millimeter wave transmitter antenna (422), a second millimeter wave receiver circuit (423) and a second millimeter wave receiver antenna (424); the input end of said second millimeter wave transmitter circuit (421) is used for receiving clock signals and its output end is connected to said second millimeter wave transmitting antenna (422); the output end of said second millimeter wave receiving circuit (423) is connected to the input end of said CAN module (31), its input end is connected to said second millimeter wave receiving antenna (424).

3. An isolated CAN device (10) according to claim 2, characterized in that said first millimeter wave transmission module (41) comprises: a first millimeter wave transmitter circuit (411), a first millimeter wave transmitter antenna (412), a first millimeter wave receiver circuit (413), and a first millimeter wave receiver antenna (414).

4. An isolated CAN device (10) according to claim 3, characterized in that, said primary side control circuit (20) comprises a digital signal processing module; the output end of said first millimeter wave receiver circuit (413) is connected to the input end of said digital signal processing module, its input end is connected to said first millimeter wave receiver antenna (414); the output end of said digital signal processing module is connected to said processor (50) via said data output interface; the input end of said first millimeter wave transmitter circuit (411) is connected to the output end of said CAN module (31), its output end is connected to said first millimeter wave transmitter antenna (412).

5. Isolated CAN device (10) according to claim 3, characterized in that, said primary side control circuit (20') comprises a data decoding module (21'); said secondary side control circuit (30') further comprises a data encoding module (32'); the input end of said data decoding module (21) is connected to the output end of said first millimeter wave receiver circuit (413), its output end is connected to said processor (50) via said data output interface; the input end of said data encoding module (32') is connected to the output end of said CAN module (31), its

6.

7. output end is connected to the input end of said first millimeter wave transmitter circuit (411); the input end of said first millimeter wave transmitting circuit (411) is connected to the output end of said CAN module (31), its output end is connected to said first millimeter wave transmitting antenna (412). Isolated CAN device (10) according to claim 5, characterized in that the interface protocols and the data output interfaces of said coding module and those of said decoding module are identical. Isolated CAN device (10) according to any one of claims 1 to 6, characterized in that said millimeter wave transmission circuit (40) is a millimeter wave transmission chip.

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