Vehicle-mounted bus chip floating voltage test circuit and electronic equipment

Abstract

This utility model discloses a floating voltage test circuit and electronic device for vehicle bus chips, applicable to the automotive field. The floating voltage test circuit for vehicle bus chips includes an oscilloscope, a master transceiver, a slave transceiver, and a VT system circuit. The VT system circuit integrates four preset boards: a first preset board powers the VT system circuit; a second preset board powers the master / slave transceivers; a third preset board sends the corresponding floating voltage to the master / slave transceivers; and a fourth preset board generates a corresponding square wave signal at the transmitting end of the master transceiver. The slave transceiver communicates with the master transceiver and sends a corresponding feedback signal to the oscilloscope. The oscilloscope determines the floating voltage status of the vehicle bus chip based on the feedback signal and the square wave signal. Therefore, this application uses a VT system circuit instead of the four programmable power supplies in the prior art, saving testing costs and reducing space requirements.

Description

Technical Field

[0001] This utility model relates to the automotive field, and in particular to a floating voltage test circuit and electronic device for an on-board bus chip. Background Technology

[0002] Testing automotive bus chips has always been a critical test in the automotive industry. In the automotive field, bus signals are often received and transmitted by chips, which are generally called transceivers.

[0003] For floating voltage testing of vehicle bus chips, the current technical solution is to provide the corresponding power supply, oscilloscope, and signal generator according to the requirements of the test scheme. A programmable power supply is used to generate floating voltage at the power and ground terminals of two vehicle bus chips (one master and one slave). The output of the signal generator is connected to the transmitter of the master chip, and the signal at the receiver of the slave chip is observed with an oscilloscope.

[0004] See the existing test plan. Figure 1 As shown, the setup includes five power supplies 11-15 (four of which are programmable), a signal generator 16, a computer 17, an oscilloscope 1, a master transceiver 2, and a slave transceiver 3. The resources consumed in a single test are extremely high, causing resource strain. Furthermore, the programmable power supplies require computer control, and different power supply manufacturers use inconsistent software. In practice, this necessitates programming on the computer (e.g., using Python) to operate power supplies from different manufacturers simultaneously, resulting in low efficiency and adding the software development process to the testing task, making it increasingly burdensome.

[0005] Given the above-mentioned technologies, finding a simple and efficient circuit for floating voltage testing of automotive bus chips is a problem that urgently needs to be solved by those skilled in the art. Utility Model Content

[0006] The purpose of this invention is to provide a floating voltage test circuit and electronic device for vehicle bus chips, which can solve the problems of cost and cumbersome operation in the prior art for floating voltage testing of vehicle bus chips.

[0007] To solve the above technical problems, this utility model provides a floating voltage test circuit for an on-board bus chip, including: an oscilloscope, a master transceiver, a slave transceiver, and a VT system circuit;

[0008] The VT system circuit integrates four preset boards, with the first preset board used to power the VT system circuit.

[0009] The positive terminal of the second preset board is connected to the positive terminal of the master transceiver and the positive terminal of the slave transceiver, and the negative terminal of the second preset board is connected to the negative terminal of the master transceiver and the negative terminal of the slave transceiver, which is used to power the master transceiver and the slave transceiver.

[0010] The first and second voltage output terminals of the third preset board are connected to the positive terminal of the master transceiver and the positive terminal of the slave master transceiver, respectively. The third and fourth voltage output terminals of the third preset board are connected to the negative terminal of the master transceiver and the negative terminal of the slave master transceiver, respectively, and are used to send corresponding floating voltages to the positive and negative terminals of the master transceiver and the slave master transceiver, respectively.

[0011] The output of the fourth preset board is connected to the transmitter of the main transceiver and the first terminal of the oscilloscope, and is used to generate a corresponding square wave signal at the transmitter of the main transceiver.

[0012] The transceiver's communication terminal is connected to the main transceiver's communication terminal, and the transceiver's output terminal is connected to the second terminal of the oscilloscope. This is used to communicate with the main transceiver and send corresponding feedback signals to the oscilloscope so that the oscilloscope can determine the floating voltage of the vehicle bus chip based on the feedback signals and square wave signals.

[0013] Preferably, the third preset board includes: a first comparator, an analog-to-digital converter, and a waveform generation circuit;

[0014] The first input terminal of the first comparator is connected to the first terminal of the analog-to-digital converter;

[0015] The second terminal of the analog-to-digital converter is connected to the waveform generation circuit;

[0016] The second input terminal of the first comparator serves as the negative terminal of the first voltage output terminal of the third preset board;

[0017] The output of the first comparator is connected to the positive terminal of the first voltage output of the third preset board.

[0018] Preferably, the third preset board further includes: a first fuse;

[0019] The first terminal of the first fuse is connected to the positive terminal of the first voltage output terminal of the third preset board;

[0020] The second terminal of the first fuse is connected to the output terminal of the first comparator.

[0021] Preferably, the third preset board further includes: a first relay and a second relay;

[0022] The first terminal of the first relay is connected to the first terminal of the second relay, the second input terminal of the first comparator, and the negative terminal of the first voltage output terminal of the third preset board.

[0023] The second terminal of the first relay is connected to the ground of the vehicle bus chip floating voltage test circuit.

[0024] The second terminal of the second relay is independently grounded.

[0025] Preferably, the fourth preset board includes: an inverter and a square wave generation circuit;

[0026] Among them, the first end of the inverter is connected to the transmitter of the main transceiver and the first end of the oscilloscope as the output end of the fourth preset board.

[0027] The second terminal of the inverter is connected to the square wave generating circuit.

[0028] The third terminal of the inverter is connected to an external power supply.

[0029] The fourth terminal of the inverter is connected to the ground of the vehicle bus chip floating voltage test circuit.

[0030] Preferably, the fourth preset board further includes: a multi-channel circuit, a digital signal input circuit, and a second comparator;

[0031] The first input terminal of the second comparator is connected to the first terminal of the inverter;

[0032] The second input terminal of the second comparator is connected to the multi-channel circuit.

[0033] The output of the second comparator is connected to the digital signal input circuit.

[0034] Preferably, the fourth preset board further includes: a second fuse;

[0035] The first end of the second fuse is connected to the transmitter of the main transceiver and the first end of the oscilloscope.

[0036] The second terminal of the second fuse is connected to the first terminal of the inverter.

[0037] Preferably, the inverter includes: a first transistor and a second transistor;

[0038] The base of the first transistor and the base of the second transistor are connected together and together serve as the second terminal of the inverter, which is connected to the square wave generating circuit.

[0039] The collector of the first transistor is connected to the collector of the second transistor, and together they serve as the first terminal of the inverter, which is connected to the transmitter of the main transceiver and the first terminal of the oscilloscope.

[0040] The emitter of the first transistor is connected to the external power supply as the third terminal of the inverter.

[0041] The emitter of the second transistor is connected to the ground of the vehicle bus chip floating voltage test circuit, serving as the fourth terminal of the inverter.

[0042] Preferably, it further includes: a host computer;

[0043] The output of the host computer is connected to the VT system circuit and is used to control the VT system circuit to perform floating voltage testing.

[0044] On the other hand, this application also provides an electronic device, including the above-mentioned vehicle bus chip floating voltage test circuit.

[0045] This utility model provides a floating voltage test circuit for an on-board bus chip, comprising: an oscilloscope, a master transceiver, a slave transceiver, and a VT system circuit; wherein, the VT system circuit integrates four preset boards, wherein the first preset board is used to power the VT system circuit; the positive terminal of the second preset board is connected to the positive terminals of the master transceiver and the slave transceiver, and the negative terminal of the second preset board is connected to the negative terminals of the master transceiver and the slave transceiver, for powering the master transceiver and the slave transceiver; the first voltage output terminal and the second voltage output terminal of the third preset board are respectively connected to the positive terminals of the master transceiver and the slave transceiver, and the third voltage output terminal of the third preset board is connected to the positive terminals of the master transceiver and the slave transceiver, respectively. The first voltage output terminal and the second voltage output terminal are connected to the negative terminals of the main transceiver and the slave transceiver, respectively, to send corresponding floating voltages to the positive and negative terminals of the main transceiver and the slave transceiver, respectively. The output terminal of the fourth preset board is connected to the transmitting terminal of the main transceiver and the first terminal of the oscilloscope, to generate a corresponding square wave signal at the transmitting terminal of the main transceiver. The communication terminal of the slave transceiver is connected to the communication terminal of the main transceiver, and the output terminal of the slave transceiver is connected to the second terminal of the oscilloscope, to communicate with the main transceiver and send a corresponding feedback signal to the oscilloscope, so that the oscilloscope can determine the floating voltage of the vehicle bus chip based on the feedback signal and the square wave signal. Therefore, this application uses a VT system circuit to replace the four programmable power supplies in the prior art, saving testing costs and reducing site requirements. Furthermore, since the VT system circuit has its own software, visual operating power supply, and signal generator, the process of developing test software is eliminated, testing time is reduced, and testing efficiency is improved. Moreover, the VT system is an integrated test system, eliminating the need for engineers to stack test equipment, saving time in setting up the test environment. Attached Figure Description

[0046] To more clearly illustrate the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Figure 1 This is a schematic diagram of floating voltage testing for automotive bus chips in existing technology.

[0048] Figure 2 A schematic diagram of a floating voltage test circuit for an on-board bus chip provided in this application;

[0049] Figure 3 A schematic diagram of the third preset board provided in the embodiments of this application;

[0050] Figure 4 This is a schematic diagram of the fourth preset board provided in the embodiments of this application. Detailed Implementation

[0051] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0052] The core of this utility model is to provide a floating voltage test circuit and electronic device for vehicle bus chips.

[0053] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0054] Figure 2 This application provides a schematic diagram of a floating voltage test circuit for an on-board bus chip, as shown below. Figure 1 As shown, it includes: oscilloscope 1, master transceiver 2, slave transceiver 3 and VT system circuit 4, and also includes host computer 5. The connection relationship is as follows: four preset boards are integrated in the VT system circuit 4; the positive terminal of the second preset board 42 is connected to the positive terminal of the master transceiver 2 and the positive terminal of the slave transceiver 3, and the negative terminal of the second preset board 42 is connected to the negative terminal of the master transceiver 2 and the negative terminal of the slave transceiver 3; the first voltage output terminal (O1a) and the second voltage output terminal (O2a) of the third preset board 43 are connected to the positive terminal of the master transceiver 2 and the positive terminal of the slave transceiver 3, respectively; the third voltage output terminal (O3a) and the fourth voltage output terminal (O4a) of the third preset board 43 are connected to the negative terminal of the master transceiver 2 and the negative terminal of the slave transceiver 3, respectively; the output terminal of the fourth preset board 44 is connected to the transmitting terminal of the master transceiver 2 and the first terminal of the oscilloscope 1; the communication terminal of the slave transceiver 3 is connected to the communication terminal of the master transceiver 2, and the output terminal of the slave transceiver 3 is connected to the second terminal of the oscilloscope 1; the host computer 5 is connected to the VT system circuit 4.

[0055] In a specific embodiment, the first preset board 41 in this application functions as follows: to supply power to the VT system circuit; the second preset board 42 functions as follows: to supply power to the master transceiver 2 and the slave transceiver 3; the third preset board 43 functions as follows: to send corresponding floating voltages to the positive and negative terminals of the master transceiver 2 and the slave transceiver 3 respectively; the fourth preset board 44 functions as follows: to generate corresponding square wave signals at the transmitting end of the master transceiver 2; the slave transceiver 3 functions as follows: to communicate with the master transceiver 2 and send corresponding feedback signals to the oscilloscope 4 so that the oscilloscope 4 can determine the floating voltage of the vehicle bus chip based on the feedback signals and the square wave signals.

[0056] The overall process is as follows: The host computer is turned on, controlling the second preset board 42 to supply power to the main transceiver 2 and the slave transceiver 3. The four voltage output terminals (O1a-O4a, which can also be understood as four voltage output channels) of the third preset board 43 are controlled to sequentially generate a floating voltage, causing some interference. The fourth preset board 44 is then controlled to generate a square wave signal. The waveforms of the received signals at the first and second terminals are then observed on the oscilloscope 1. If the waveform of the signal at the second terminal is a square wave, the test passes.

[0057] As a preferred embodiment, the model of the first preset board 41 can be VTC8920; the model of the second preset board 42 can be VT7001; the model of the third preset board 43 can be VT2816; and the model of the fourth preset board 44 can be VT2848.

[0058] This utility model provides a floating voltage test circuit for an on-board bus chip, comprising: an oscilloscope, a master transceiver, a slave transceiver, and a VT system circuit; wherein, the VT system circuit integrates four preset boards, wherein the first preset board is used to power the VT system circuit; the positive terminal of the second preset board is connected to the positive terminals of the master transceiver and the slave transceiver, and the negative terminal of the second preset board is connected to the negative terminals of the master transceiver and the slave transceiver, for powering the master transceiver and the slave transceiver; the first voltage output terminal and the second voltage output terminal of the third preset board are respectively connected to the positive terminals of the master transceiver and the slave transceiver, and the third voltage output terminal of the third preset board is connected to the positive terminals of the master transceiver and the slave transceiver, respectively. The first voltage output terminal and the second voltage output terminal are connected to the negative terminals of the main transceiver and the slave transceiver, respectively, to send corresponding floating voltages to the positive and negative terminals of the main transceiver and the slave transceiver, respectively. The output terminal of the fourth preset board is connected to the transmitting terminal of the main transceiver and the first terminal of the oscilloscope, to generate a corresponding square wave signal at the transmitting terminal of the main transceiver. The communication terminal of the slave transceiver is connected to the communication terminal of the main transceiver, and the output terminal of the slave transceiver is connected to the second terminal of the oscilloscope, to communicate with the main transceiver and send a corresponding feedback signal to the oscilloscope, so that the oscilloscope can determine the floating voltage of the vehicle bus chip based on the feedback signal and the square wave signal. Therefore, this application uses a VT system circuit to replace the four programmable power supplies in the prior art, saving testing costs and reducing site requirements. Furthermore, since the VT system circuit has built-in software, it allows for visual operation of the power supply and signal generator, eliminating the need to develop test software, reducing testing time, and improving testing efficiency. Moreover, the VT system is an integrated test system, eliminating the need for engineers to stack test equipment, saving time in setting up the test environment.

[0059] In specific embodiments, such as Figure 3 As shown, its third preset board 43 includes: a first comparator U1, an analog-to-digital converter U2, and a waveform generation circuit 431. Their connections are as follows: the first input terminal of the first comparator U1 is connected to the first terminal of the analog-to-digital converter U2; the second terminal of the analog-to-digital converter U2 is connected to the waveform generation circuit 431; the second input terminal of the first comparator U1 serves as the negative terminal b of the first voltage output terminal of the third preset board 43; the output terminal of the first comparator U1 is connected to the positive terminal a of the first voltage output terminal of the third preset board 43.

[0060] In addition, it includes: a first fuse Q1, a first relay K1, and a second relay K2; the connection relationship is as follows: the first end of the first fuse Q1 is connected to the positive terminal a of the first voltage output terminal of the third preset board 43; the second end of the first fuse Q1 is connected to the output terminal of the first comparator U1; the first end of the first relay K1 is connected to the first end of the second relay K2, the second input terminal of the first comparator U1, and the negative terminal b of the first voltage output terminal of the third preset board 43; the second end of the first relay K1 is connected to the ground ECU GND of the vehicle bus chip floating voltage test circuit; the second end of the second relay K2 is independently grounded to DGND.

[0061] In other words, the positive terminal 'a' of the first voltage output terminal of the third preset board 43 is O1a, which is connected to the 200mA first fuse Q1, then to the output terminal of the first comparator U1. The first input terminal (non-inverting input terminal) of the first comparator U1 is connected to the analog-to-digital converter U2, and then to the waveform generation circuit 431 inside the system that can generate sine waves and continuous voltage signals. The second input terminal (inverting input terminal) of the first comparator U1 is connected to the negative terminal 'b' of the first voltage output terminal of the third preset board 43. Two relays are connected to the line, one to system ground and the other to independent ground. When these two relays are open, both ports 'a' and 'b' need to be connected to the circuit simultaneously. When one of the relays is closed, only port 'a' needs to be connected to the circuit.

[0062] It should be noted that each channel in its third preset board 43 corresponds to one Figure 3 The circuit shown is connected to the corresponding channel. In other words, the number of channels in the third preset board 43 determines the number of channels connected. Figure 3 The circuit shown.

[0063] In specific embodiments, such as Figure 4 As shown, the fourth preset board 44 includes an inverter and a square wave generation circuit 441. The connections are as follows: the first terminal of the inverter serves as the output terminal of the fourth preset board 44 and is connected to the transmitting terminal of the main transceiver 2 and the first terminal of the oscilloscope 1; the second terminal of the inverter is connected to the square wave generation circuit 441; the third terminal of the inverter is connected to the external power supply Vbatt; and the fourth terminal of the inverter is connected to the ground ECU GND of the vehicle bus chip floating voltage test circuit.

[0064] In addition, it includes: a multi-channel circuit 442, a digital signal input circuit 443, a second comparator U3, and a second fuse Q2. The connections are as follows: the first input terminal of the second comparator U3 is connected to the first terminal of the inverter; the second input terminal of the second comparator U3 is connected to the multi-channel circuit 442; the output terminal of the second comparator U3 is connected to the digital signal input circuit 443; the first terminal of the second fuse Q2 is connected to the transmitting terminal of the main transceiver 2 and the first terminal of the oscilloscope 1; the second terminal of the second fuse Q2 is connected to the first terminal of the inverter.

[0065] It should be noted that the inverter is composed of two transistors (transistor T1 and transistor T2). The bases of transistors T1 and T2 are connected together and serve as the second terminal of the inverter, connected to the square wave generation circuit 441. The collectors of transistors T1 and T2 are connected together and serve as the first terminal of the inverter, connected to the transmitter of the main transceiver 2 and the first terminal of the oscilloscope 1. The emitter of transistor T1 serves as the third terminal of the inverter and is connected to the external power supply. The emitter of transistor T2 serves as the fourth terminal of the inverter and is connected to the ground of the vehicle bus chip floating voltage test circuit.

[0066] In other words, the first terminal of the inverter, the digital I / O port, serves as the output terminal of the fourth preset board 44. It is then connected to a 200mA second fuse Q2. After the second fuse Q2, an inverter composed of two transistors is connected. The rear end of the inverter is connected to a square wave generation circuit 441 that generates signals internally. The PWM signal generation principle of the square wave generation circuit 441 is as follows: when the digital output circuit outputs a low level, the upper transistor (first transistor T1) of the inverter conducts, and Vbatt outputs a high level to the digital I / O. When the digital output circuit outputs a high level, the lower transistor (second transistor T2) of the inverter conducts, and ECU GND outputs a low level to the digital I / O. It should be noted that every eight channels in the fourth preset board 44 are connected to the same Vbatt outputting a high level.

[0067] It should be noted that the embodiments provided in this application are only one possible implementation method, but are not limited to this only implementation method. Users can set their own implementation methods according to their needs.

[0068] Therefore, this application uses the VT system circuit to replace the four programmable power supplies in the prior art, which saves testing costs and reduces site requirements. At the same time, since the VT system circuit comes with its own software, the power supply and signal generator can be operated visually, eliminating the need to develop test software, reducing testing time and improving testing efficiency. Furthermore, the VT system is an integrated test system, which does not require engineers to stack test equipment, saving time in setting up the test environment.

[0069] On the other hand, this application also discloses an electronic device that includes the above-mentioned vehicle bus chip floating voltage test circuit and has the same beneficial effects.

[0070] Since the embodiments of the electronic devices provided in this application are the same as the embodiments of the above-described vehicle bus chip floating voltage test circuit, this application will not repeat them here.

[0071] The above provides a detailed description of a vehicle bus chip floating voltage test circuit and electronic device provided by this utility model. The various embodiments in the specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section. It should be noted that those skilled in the art can make several improvements and modifications to this utility model without departing from the principle of this utility model, and these improvements and modifications also fall within the protection scope of the claims of this utility model.

[0072] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A floating voltage test circuit for an onboard bus chip, characterized in that, include: Oscilloscope, master transceiver, slave transceiver and VT system circuitry; The VT system circuit integrates four preset boards, wherein the first preset board is used to power the VT system circuit. The positive terminal of the second preset board is connected to the positive terminal of the master transceiver and the positive terminal of the slave transceiver, and the negative terminal of the second preset board is connected to the negative terminal of the master transceiver and the negative terminal of the slave transceiver, for powering the master transceiver and the slave transceiver; The first and second voltage output terminals of the third preset board are connected to the positive terminal of the master transceiver and the positive terminal of the slave master transceiver, respectively. The third and fourth voltage output terminals of the third preset board are connected to the negative terminal of the master transceiver and the negative terminal of the slave master transceiver, respectively, for sending corresponding floating voltages to the positive and negative terminals of the master transceiver and the slave master transceiver, respectively. The output terminal of the fourth preset board is connected to the transmitting terminal of the main transceiver and the first terminal of the oscilloscope, and is used to generate a corresponding square wave signal at the transmitting terminal of the main transceiver; The communication terminal of the slave transceiver is connected to the communication terminal of the master transceiver, and the output terminal of the slave transceiver is connected to the second terminal of the oscilloscope for communicating with the master transceiver and sending a corresponding feedback signal to the oscilloscope so that the oscilloscope can determine the floating voltage of the vehicle bus chip based on the feedback signal and the square wave signal.

2. The vehicle bus chip floating voltage test circuit according to claim 1, characterized in that, The third preset board includes: a first comparator, an analog-to-digital converter, and a waveform generation circuit; The first input terminal of the first comparator is connected to the first terminal of the analog-to-digital converter; The second terminal of the analog-to-digital converter is connected to the waveform generation circuit. The second input terminal of the first comparator serves as the negative terminal of the first voltage output terminal of the third preset board; The output terminal of the first comparator is connected to the positive terminal of the first voltage output terminal of the third preset board.

3. The vehicle bus chip floating voltage test circuit according to claim 2, characterized in that, The third preset board also includes: a first fuse; Wherein, the first end of the first fuse is connected to the positive terminal of the first voltage output terminal of the third preset board; The second terminal of the first fuse is connected to the output terminal of the first comparator.

4. The vehicle bus chip floating voltage test circuit according to claim 3, characterized in that, The third preset board also includes: a first relay and a second relay; Wherein, the first terminal of the first relay is connected to the first terminal of the second relay, the second input terminal of the first comparator, and the negative terminal of the first voltage output terminal of the third preset board; The second terminal of the first relay is connected to the ground of the vehicle bus chip floating voltage test circuit; The second terminal of the second relay is independently grounded.

5. The vehicle bus chip floating voltage test circuit according to claim 1, characterized in that, The fourth preset board includes: an inverter and a square wave generation circuit; Wherein, the first end of the inverter serves as the output end of the fourth preset board and is connected to the transmitter end of the main transceiver and the first end of the oscilloscope; The second terminal of the inverter is connected to the square wave generating circuit. The third terminal of the inverter is connected to the external power supply; The fourth terminal of the inverter is connected to the ground of the vehicle bus chip floating voltage test circuit.

6. The vehicle bus chip floating voltage test circuit according to claim 5, characterized in that, The fourth preset board also includes: a multi-channel circuit, a digital signal input circuit, and a second comparator; The first input terminal of the second comparator is connected to the first terminal of the inverter; The second input terminal of the second comparator is connected to the multi-channel circuit; The output of the second comparator is connected to the digital signal input circuit.

7. The vehicle bus chip floating voltage test circuit according to claim 6, characterized in that, The fourth preset board also includes: a second fuse; Wherein, the first end of the second fuse is connected to the transmitting end of the main transceiver and the first end of the oscilloscope; The second end of the second fuse is connected to the first end of the inverter.

8. The vehicle bus chip floating voltage test circuit according to claim 7, characterized in that, The inverter includes: a first transistor and a second transistor; The bases of the first transistor and the second transistor are connected together and together serve as the second terminal of the inverter, which is connected to the square wave generating circuit. The collector of the first transistor is connected to the collector of the second transistor, and together they serve as the first terminal of the inverter, which is connected to the transmitter of the main transceiver and the first terminal of the oscilloscope. The emitter of the first transistor is connected to the external power supply as the third terminal of the inverter; The emitter of the second transistor serves as the fourth terminal of the inverter and is connected to the ground of the vehicle bus chip floating voltage test circuit.

9. The vehicle bus chip floating voltage test circuit according to any one of claims 1-8, characterized in that, Also includes: Host computer; The output terminal of the host computer is connected to the VT system circuit and is used to control the VT system circuit to perform floating voltage testing.

10. An electronic device, characterized in that, Includes the vehicle bus chip floating voltage test circuit as described in any one of claims 1-9.

Images