A handheld detection device

Abstract

The application provides a handheld detection device, which comprises a battery, a DC / DC conversion circuit, a first conversion unit, a second conversion unit, a third conversion unit, a digital controller, a communication circuit and a fault detection circuit.

Description

Technical Field

[0001] This application relates to the field of equipment fault detection, and in particular to a handheld detection device. Background Technology

[0002] The core operating mechanism of energy storage battery systems involves configuring numerous cells in series and parallel. Series connection is used to increase the output voltage, while parallel connection is used to increase the energy storage capacity to adapt to diverse power application scenarios and load requirements.

[0003] Understandably, the energy storage battery system also includes corresponding circuits to perform functions such as charging and discharging the cells or improving the reliability of the cells, such as voltage equalization circuits, wake-up circuits, fault diagnosis circuits, communication circuits, addressing circuits, etc., as well as controllers that control the operation of these circuits.

[0004] In practical applications, various reasons, such as component damage or poor connections, often lead to circuit or controller failures within the energy storage battery system. To improve the reliability of the energy storage battery system, it is necessary to detect these failures in order to carry out repairs or replacements.

[0005] Currently, to perform after-sales fault detection for battery energy storage systems, a laptop, a CAN box, an RS485 device, special wiring harnesses, and host computer software are typically required for repairing these systems. This approach has many drawbacks, including: high hardware costs (requiring a laptop, CAN box, RS485 device, etc.); high learning costs (users must be proficient in using the host computer, installing the CAN box driver, installing the RS485 device driver, and fabricating the special wiring harness); numerous host computers required for different battery energy storage systems; poor portability (usually requiring a fixed workstation, and the bulky battery energy storage system further complicates repairs); inconvenient upgrades (requiring the latest firmware package from a cloud server, saving it to the local computer, and then using dedicated upgrade software, with the battery energy storage system powered on for the upgrade to complete); lack of battery diagnostic functionality; and poor scalability (adding or optimizing features requires updating the host computer software). Utility Model Content

[0006] According to one embodiment, this application provides a handheld testing device, comprising: a battery; a DC / DC conversion circuit connected to the battery for converting the battery voltage provided by the battery into a first DC current; a first conversion unit connected to the DC / DC conversion circuit for converting the first DC current into a second DC current, wherein the second DC current is output to a first interface of the handheld testing device, the first interface being used to connect to a device under test; a second conversion unit connected to the DC / DC conversion circuit for converting the first DC current into a third DC current, wherein the third DC current is output to the first interface; a third conversion unit connected to the DC / DC conversion circuit for converting the first DC current into a fourth DC current; a digital controller, wherein the fourth DC current supplies power to the digital controller; a communication circuit connected between the digital controller and the first interface for communicating between the digital controller and the device under test; and a fault detection circuit connected between the digital controller and the first interface for transmitting a detection signal between the digital controller and the device under test, wherein the digital controller determines whether the device under test is faulty based on the detection signal.

[0007] Furthermore, the second DC power supply powers the device under test through the first interface.

[0008] Furthermore, the third DC power supply provides power to the wake-up circuit and control circuit within the device under test via the first interface.

[0009] Furthermore, the communication circuit includes: a CAN communication input circuit connected between the digital controller and the first relay unit; and a 485 communication input circuit connected between the digital controller and the first relay unit, wherein the first relay unit is also connected to the first interface, and the first interface is also used to connect to the communication output port of the device under test.

[0010] Furthermore, when the communication output port of the device under test is a CAN communication port, the first relay unit is in a first state, and the first relay unit connects the CAN communication input circuit to the CAN communication port of the device under test; when the communication output port of the device under test is a 485 communication port, the first relay unit is in a second state, and the first relay unit connects the 485 communication input circuit to the 485 communication port of the device under test.

[0011] Furthermore, the communication circuit also includes: a CAN communication output circuit connected between the digital controller and the second relay unit; and a 485 communication output circuit connected between the digital controller and the second relay unit, wherein the second relay unit is also connected to the first interface, and the first interface is also used to connect to the communication input port of the device under test.

[0012] Furthermore, when the communication input port of the device under test is a CAN communication port, the second relay unit is in a first state, and the second relay unit connects the CAN communication output circuit to the CAN communication port of the device under test; when the communication output port of the device under test is a 485 communication port, the second relay unit is in a second state, and the second relay unit connects the 485 communication output circuit to the 485 communication port of the device under test.

[0013] Furthermore, the fault detection circuit includes: a fault detection communication input circuit connected between the digital controller and the first interface, for receiving a detection signal output from the communication output port of the device under test; and a fault detection communication output circuit connected between the digital controller and the first interface, for outputting a detection signal to the communication input port of the device under test.

[0014] Furthermore, the handheld testing device also includes a second interface for connecting to an external storage device, through which the external storage device upgrades the digital controller.

[0015] Furthermore, the DC / DC conversion circuit is a bidirectional DC / DC conversion circuit. The DC / DC conversion circuit is connected to an external power source through the third interface of the holding detection device. The DC / DC conversion circuit converts the DC power provided by the external power source into a battery voltage for charging the battery.

[0016] The features and technical advantages of this disclosure have been outlined quite extensively above to facilitate a better understanding of the detailed description that follows. Additional features and advantages of this disclosure, which form the subject matter of the claims, will be described below. Those skilled in the art will understand that the disclosed concepts and specific embodiments can be readily used as the basis for modifying or designing other structures or processes for achieving the same purpose as this disclosure. Those skilled in the art will also recognize that such equivalent structures do not depart from the spirit and scope of this disclosure as set forth in the appended claims. Attached Figure Description

[0017] To gain a more complete understanding of this disclosure and its advantages, the following description is given in conjunction with the accompanying drawings, wherein:

[0018] Figure 1 A schematic diagram of a handheld detection device according to an embodiment of this application is shown;

[0019] Figure 2 A schematic diagram of a communication circuit according to an embodiment of this application is shown, wherein the first relay unit and the second relay unit are in a first state;

[0020] Figure 3 A schematic diagram of a communication circuit according to an embodiment of this application is shown, wherein the first relay unit and the second relay unit are in a second state;

[0021] Figure 4 A schematic diagram of a fault detection circuit according to an embodiment of this application is shown;

[0022] Figure 5 A schematic diagram of a handheld detection device according to another embodiment of this application is shown.

[0023] Unless otherwise stated, corresponding numbers and symbols in the various figures generally refer to corresponding parts. These figures are drawn to clearly illustrate relevant aspects of the various embodiments and are not necessarily drawn to scale. Detailed Implementation

[0024] The technical solutions of this application will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0025] One embodiment of this application proposes a handheld testing device that can independently complete the fault detection of an energy storage battery system without the need for numerous devices in the prior art. It also has the advantages of being compact, portable, easy to upgrade, convenient to use, and highly expandable.

[0026] For details, please refer to Figure 1 The diagram shows a handheld inspection device according to an embodiment of this application. The handheld inspection device proposed in this application includes:

[0027] Battery 100:

[0028] DC / DC converter circuit 200 is connected to the battery 100 and is used to convert the battery voltage Vbat provided by the battery 100 into a first DC voltage V1.

[0029] The first conversion unit 300 is connected to the DC / DC conversion circuit 200 and is used to convert the first DC power V1 into a second DC power V2. The second DC power V2 is output to the first interface d1 of the handheld testing device 10. The first interface d1 is used to connect to the device under test.

[0030] The second conversion unit 400 is connected to the DC / DC conversion circuit 200 and is used to convert the first DC power V1 into a third DC power V3, and the third DC power V3 is output to the first interface d1.

[0031] The third conversion unit 500 is connected to the DC / DC conversion circuit 200 and is used to convert the first DC power V1 into the fourth DC power V4.

[0032] Digital controller 600, wherein the fourth DC power supply V4 supplies power to digital controller 600;

[0033] A communication circuit 700 is connected between the digital controller 600 and the first interface d1, and is used for communication between the digital controller 600 and the device under test;

[0034] A fault detection circuit 800 is connected between the digital controller 600 and the first interface d1, and is used to transmit a detection signal between the digital controller 600 and the device under test. The digital controller 600 determines whether the device under test is faulty based on the detection signal.

[0035] In practical applications, such as Figure 1 As shown, the first port d1 of the handheld testing device 10 is connected to the device under test via a wire 20. This wire 20 includes signal lines and power lines. The signal lines can be adjusted to accommodate the number of signals to be transmitted, and the power lines can be adjusted to accommodate the number of power signals to be transmitted. Thus, a single wire 20 can accommodate both power and signal transmission. Of course, multiple wires can also be used to achieve power and signal transmission between the handheld testing device 10 and the device under test; this application does not limit this.

[0036] As described above, the handheld testing device provided in this application has a built-in battery that can power both itself and the device under test, waking it up for fault detection. Specifically, in practical applications, battery 100 can be a small, nominally 3.7V, 4400mA / H battery, demonstrating its small size and light weight.

[0037] In practical applications, the nominal small battery is a rechargeable and dischargeable battery. As described above, the battery 100 converts the battery voltage Vbat provided by the battery 100 into a first DC voltage V1 to power its load through the DC / DC conversion circuit 200, that is, the battery 100 discharges. In practical applications, the DC / DC conversion circuit 200 is a bidirectional DC / DC conversion circuit. The holding detection device includes a third interface d3, and an external power supply can be inserted into the third interface d3. Then, the DC / DC conversion circuit 200 can be connected to the external power supply through the third interface d3, and the DC / DC conversion circuit 200 converts the DC voltage provided by the external power supply into a battery voltage Vbat to charge the battery 100.

[0038] In practical applications, battery voltage and current can also be collected and transmitted to digital controller 600 through transmission circuit. Digital controller 600 calculates the remaining power of battery 100 and displays it on the screen of handheld detection device to remind the user of the power status of battery 100 so that it can be charged in time, or when battery 100 is being charged, it can display that it is being charged on the screen.

[0039] The handheld testing device provided in this application has a low power consumption. A small battery with a nominal voltage of 3.7V and a capacity of 4400mA / H can typically support its use for up to 8 hours. It is evident that the handheld testing device provided in this application has a long battery life and is convenient for users.

[0040] As described above, the device under test also includes a screen for displaying information. In fact, the device under test may also include other display or prompting devices, such as lamps. The aforementioned fourth DC power supply V4 also powers the screen or lamps. Furthermore, the aforementioned fourth DC power supply V4 powers any device that the device under test itself needs power for. And as described above, the fourth DC power supply V4 is derived from the battery voltage Vbat via the DC / DC converter circuit 200. Therefore, the battery 100 powers any device that the device under test itself needs power for, which improves the portability of the handheld testing device.

[0041] In practical applications, the fourth DC power supply V4 that powers the digital controller 600, screen, lights and other devices is usually 5V. Of course, this application does not limit the specific value of the fourth DC power supply V4.

[0042] In practical applications, the first DC power V1 provided by the DC / DC converter circuit 200 (i.e., the output terminal of the DC / DC converter circuit 200) is connected to the first converter unit 300, the second converter unit 400, and the third converter unit 500 through the switch S. When the switch S is closed, the battery 100 can power itself and the device under test, that is, the handheld testing device 10 starts to work.

[0043] In practical applications, switch S is typically controlled by a manual button on the handheld detection device 10. When the user presses the manual button, switch S closes, and the handheld detection device 10 begins to operate; when the user presses the manual button again, causing it to pop up, switch S opens, and the handheld detection device 10 stops operating. Of course, this application does not limit the control method for closing and opening switch S, as long as it can be controlled to close or close to achieve control over whether the handheld detection device is operating.

[0044] In practical applications, before testing the device under test, it is necessary to wake it up, that is, to start its internal circuitry. Furthermore, the second DC power supply V2 supplies power to the device under test through the first interface d1. The third DC power supply V3 supplies power to the wake-up and control circuitry within the device under test through the first interface d1. This wakes up the device under test, enabling it to operate and communicate with the handheld testing device.

[0045] In practical applications, the second DC power supply V2 that powers the device under test is typically 12V; the third DC power supply V3 that powers the wake-up circuit and control circuit (or other low-voltage circuits) within the device under test is typically 5V. Of course, this application does not limit the specific values ​​of the second DC power supply V2 and the third DC power supply V3.

[0046] In practical applications, the first conversion unit 300, the second conversion unit 400, and the third conversion unit 500 are all isolation conversion units. Therefore, each of these units may include an isolation transformer and a switching unit to achieve the aforementioned voltage conversion and isolation functions. Of course, this application does not limit the specific structure of the first conversion unit 300, the second conversion unit 400, and the third conversion unit 500, as long as they can achieve the aforementioned conversion functions.

[0047] In practical applications, as described above, the DC / DC converter circuit 200 converts the battery voltage Vbat (e.g., 3.7V) provided by the battery 100 into a first DC voltage V1. Typically, the DC / DC converter circuit 200 boosts the 3.7V battery voltage Vbat to a 5V first DC voltage V1. Then, the first conversion unit 300 converts the 5V first DC voltage V1 into a 12V second DC voltage V2 and isolates it; the second conversion unit 400 converts the 5V first DC voltage V1 into a 5V third DC voltage V3 and isolates it; and the third conversion unit 500 converts the 5V first DC voltage V1 into a 5V fourth DC voltage V4 and isolates it. Of course, this application does not limit the specific values ​​of the above voltages.

[0048] Please see Figure 2The diagram shown is a communication circuit schematic of an embodiment of this application, in which the first relay unit and the second relay unit are in a first state. Please refer to [link / reference]. Figure 3 The diagram shows a communication circuit according to an embodiment of this application, wherein the first relay unit and the second relay unit are in a second state. The communication circuit 700 includes: a CAN communication input circuit 710 connected between the digital controller 600 and the first relay unit K1; and a 485 communication input circuit 720 connected between the digital controller 600 and the first relay unit K1, wherein the first relay unit K1 is also connected to the first interface d1, and the first interface d1 is also used to connect to the communication output port dout of the device under test.

[0049] Furthermore, please refer to Figure 2 In practical applications, when the communication output port dout of the device under test is a CAN communication port, the first relay unit K1 is in a first state, and the first relay unit K1 connects the CAN communication input circuit 710 to the CAN communication port of the device under test. Further, please refer to... Figure 3 In practical applications, when the communication output port dout of the device under test is a 485 communication port, the first relay unit K1 is in the second state, and the first relay unit K1 connects the 485 communication input circuit 720 to the 485 communication port of the device under test.

[0050] Furthermore, please refer to Figure 2 In practical applications, the communication circuit 700 further includes: a CAN communication output circuit 730 connected between the digital controller 600 and the second relay unit K2; and a 485 communication output circuit 740 connected between the digital controller 600 and the second relay unit K2, wherein the second relay unit K2 is also connected to the first interface d1, and the first interface d1 is also used to connect to the communication input port din of the device under test.

[0051] Furthermore, please refer to Figure 2 In practical applications, when the communication input port din of the device under test is a CAN communication port, the second relay unit K2 is in a first state, and the second relay unit K2 connects the CAN communication output circuit 730 to the CAN communication port of the device under test. Further details can be found in the following documentation. Figure 3 In practical applications, when the communication output port dou of the device under test is a 485 communication port, the second relay unit K2 is in the second state, and the second relay unit K2 connects the 485 communication output circuit 740 to the 485 communication port of the device under test.

[0052] In practical applications, once the handheld testing device 10 starts working and wakes up the device under test, it can communicate with the device under test. Specifically, the device under test outputs testing information through its communication output port dout. This testing information is then input to the digital controller 600 via the CAN communication input circuit 710 or the 485 communication input circuit 720, transmitting the testing information from the device under test to the digital controller 600. Alternatively, the digital controller 600 transmits the testing information to the communication input port din of the device under test via the CAN communication output circuit 730 or the 485 communication output circuit 740, transmitting the testing information from the digital controller 600 to the device under test. This communication between the two devices enables fault detection of the device under test.

[0053] In practical applications, some devices under test support CAN communication, while others support 485 communication. Therefore, as mentioned above, the handheld testing device of this application is compatible with both CAN and 485 communication.

[0054] Specifically, such as Figure 2 and Figure 3 As shown, the first relay unit K1 and the second relay unit K2 are double-pole double-throw relays. In the default state, as... Figure 2 As shown, the first relay unit K1 and the second relay unit K2 are not activated. The double-pole terminals of the first relay unit K1 are by default switched to the CAN communication input circuit 710 and the CAN communication input line L1, respectively. The CAN communication input line L1 is connected to the CAN communication port of the device under test. Therefore, the first relay unit K1 connects the CAN communication input circuit 710 to the CAN communication port of the device under test. Similarly, the double-pole terminals of the second relay unit K2 are by default switched to the CAN communication output circuit 730 and the CAN communication output line L2, respectively. The CAN communication output line L2 is connected to the CAN communication port of the device under test. Therefore, the second relay unit K2 connects the CAN communication output circuit 730 to the CAN communication port of the device under test. That is, in the default state, signals are transmitted between the handheld testing device and the device under test via CAN communication.

[0055] When the device under test supports 485 communication, such as Figure 3As shown, the digital controller 600 controls the operation of the first relay unit K1 and the second relay unit K2, causing the double-pole terminals of the first relay unit K1 to switch to the 485 communication input circuit 720 and the 485 communication input line L3, respectively. The 485 communication input line L1 is connected to the 485 communication port of the device under test, thus connecting the 485 communication input circuit 720 to the 485 communication port of the device under test. Similarly, the double-pole terminals of the second relay unit K2 are switched to the 485 communication output circuit 740 and the 485 communication output line L4, respectively. The 485 communication output line L4 is connected to the 485 communication port of the device under test, thus connecting the 485 communication output circuit 740 to the 485 communication port of the device under test. In this state, i.e., when the device under test supports 485 communication, signals are transmitted between the handheld testing device 10 and the device under test using 485 communication.

[0056] In practical applications, CAN communication is used by default. When there is no response from CAN communication, the digital controller 600 controls the first and second relays to switch to 485 communication to communicate with the energy storage battery system.

[0057] In practical applications, after the device under test is activated, it can transmit the fault information it detects to a handheld testing device via communication. Specifically, the transmission is made to the digital controller 600 of the handheld testing device, allowing the handheld testing device to obtain the fault information fed back by the device under test. For example, in the default state, i.e., when the device under test supports CAN communication, ... Figure 2 As shown, fault information from the device under test is transmitted to the digital controller 600 through its CAN communication port, CAN communication input line L1, and CAN communication input circuit 710, thus obtaining the fault information fed back by the device under test.

[0058] In practical applications, the handheld testing device 10 provided in this application, in addition to obtaining fault information transmitted by the tested device through communication, can also select the type of the tested object after powering on. After successful identification, it can view the version information, real-time data, diagnose the battery, upgrade firmware, and export data of the tested object.

[0059] For details, please refer to Figure 4The diagram shown is a schematic of a fault detection circuit according to an embodiment of this application. The fault detection circuit 800 includes: a fault detection communication input circuit 810 connected between the digital controller 600 and the first interface d1, for receiving a detection signal output from the communication output port dou of the device under test; and a fault detection communication output circuit 820 connected between the digital controller 600 and the first interface d1, for outputting a detection signal to the communication input port din of the device under test.

[0060] In one specific embodiment, the fault detection communication input circuit 810 and the fault detection communication output circuit 820 are used to detect whether the addressing circuit of the device under test is normal. During diagnosis, the digital controller 600 controls the fault detection communication output circuit 820 to output a detection signal, such as a 5V voltage signal, to the communication input port din of the device under test. If the addressing circuit of the device under test is normal, the addressing circuit of the device under test will address the 5V voltage signal and will also output a 5V voltage signal as a detection signal to the fault detection communication input circuit 810 through its communication output port dout. The fault detection communication input circuit 810 feeds back the 5V voltage signal to the digital controller 600, and the digital controller 600 considers the addressing circuit of the device under test to be normal. If the addressing circuit of the device under test is abnormal, the digital controller 600 will not receive the detection signal or the signal will not be 5V, and the digital controller 600 considers the addressing circuit of the device under test to be abnormal. This completes the detection of the addressing circuit of the device under test.

[0061] In one specific embodiment, the fault detection communication input circuit 810 and the fault detection communication output circuit 820 are used to detect whether the fault detection output circuit in the device under test is normal. During diagnosis, the digital controller 600 controls the fault detection communication output circuit 820 to output a detection signal, such as a differential signal, to the communication input port din of the device under test. If the fault detection output circuit of the device under test is normal, the device under test will also output a differential signal as a detection signal to the fault detection communication input circuit 810 through its communication output port dout. The fault detection communication input circuit 810 feeds back the differential signal to the digital controller 600. If the digital controller 600 analyzes that the differential signals sent and received by the handheld testing device 10 are logically the same, the digital controller 600 considers the fault detection output circuit of the device under test to be normal. If the digital controller 600 analyzes that the differential signals sent and received by the handheld testing device 10 are logically different, or the digital controller 600 does not receive a differential signal, the digital controller 600 considers the fault detection output circuit of the device under test to be abnormal. In this way, the detection of the fault detection output circuit of the device under test is completed.

[0062] The detection principles and methods for the input circuit of the fault detection of the equipment under test and the detection principles and methods for the output circuit of the fault detection of the equipment under test will not be elaborated here.

[0063] In practical applications, the digital controller 600 transmits the detection signal to the device under test through the fault detection communication output circuit 820 and the communication input port din of the device under test. Then, it receives the detection feedback signal through the communication output port dout of the device under test and the fault detection communication input circuit 810. This allows for the detection of faults in any circuit within the device under test, depending on the target detection circuit (such as voltage equalization circuits, device faults, or line connection faults). Thus, the handheld testing device 10 provided in this application, in addition to obtaining fault information transmitted from the device under test through communication, can also actively detect faults within the device under test. This avoids situations where the device under test fails to diagnose faults due to prolonged inactivity. When the handheld testing device 10 wakes up the device under test, it can diagnose whether the circuits within the device under test are functioning normally using the method described above.

[0064] In practical applications, once the communication circuit 700 determines whether to use CAN communication or 485 communication, the fault detection circuit 800 will use the determined communication method for signal transmission.

[0065] In practical applications, the communication input port din and communication output port dout of the device under test can be integrated into a single port of the device under test and connected by a single wire (e.g., ...). Figure 1 The wire 20 in the middle connects the first port d1 of the handheld testing device 10 to the port of the device being tested.

[0066] In practical applications, please refer to Figure 5 The schematic diagram of another embodiment of the handheld testing device shown in this application illustrates that the handheld testing device 10 further includes a second interface d2. The second interface d2 is used to connect to an external storage device, which upgrades the digital controller 600 through the second interface d2, for example, by upgrading the program within the digital controller 600. Thus, the handheld testing device 10 provided in this application can easily upgrade itself. Users only need to copy the latest upgrade program to an external storage device, such as a USB flash drive, and then insert it into the second interface d2 of the handheld testing device 10 to upgrade the digital controller 600 to the latest version.

[0067] In practical applications, the device under test can be the aforementioned energy storage battery system, or other devices such as a high-voltage main control battery box, a stacked battery main control, a stacked battery module system, a low-voltage battery system, etc.

[0068] This application provides a handheld testing device, which is small and portable, allowing for convenient operation by hand. As described above, this device has three ports, which can be connected to other devices (such as the device under test) via wires or directly plugged into storage devices, indicating that it requires fewer peripheral devices. Therefore, the handheld testing device provided by this application overcomes the various shortcomings mentioned in the prior art regarding after-sales fault detection systems, and can promptly detect faults in the device under test, thus improving the reliability of the device under test.

[0069] In practical implementation, the aforementioned digital controller 600 can be a DSP, MUC, etc.

[0070] Although embodiments of the present disclosure and their advantages have been described in detail, it should be understood that various changes, substitutions and alterations may be made herein without departing from the spirit and scope of the present disclosure as defined by the appended claims.

[0071] Furthermore, the scope of this application is not intended to be limited to the specific embodiments of the processes, machines, manufactures, compositions of matter, apparatuses, methods, and steps described in the specification. As will be readily understood by those skilled in the art from the disclosure of this publication, processes, machines, manufactures, compositions of matter, means, methods, or steps that perform substantially the same function, currently exist or will be developed or implemented thereafter, will yield substantially the same results as the corresponding embodiments described herein that are available according to this disclosure. Therefore, the appended claims are intended to include such processes, machines, manufactures, compositions of matter, apparatuses, methods, or steps within their scope.

Claims

1. A handheld testing device, characterized in that, include: Battery; A DC / DC converter circuit is connected to the battery and is used to convert the battery voltage provided by the battery into a first direct current. The first conversion unit is connected to the DC / DC conversion circuit and is used to convert the first DC power into a second DC power. The second DC power is output to the first interface of the handheld testing device, and the first interface is used to connect to the device being tested. The second conversion unit is connected to the DC / DC conversion circuit and is used to convert the first DC power into a third DC power, the third DC power being output to the first interface. The third conversion unit is connected to the DC / DC conversion circuit and is used to convert the first DC power into a fourth DC power. A digital controller, wherein the fourth DC power supply powers the digital controller; A communication circuit is connected between the digital controller and the first interface for communication between the digital controller and the device under test. A fault detection circuit is connected between the digital controller and the first interface, and is used to transmit a detection signal between the digital controller and the device under test. The digital controller determines whether the device under test is faulty based on the detection signal.

2. The handheld testing device according to claim 1, characterized in that, The second DC power supply powers the device under test through the first interface.

3. The handheld testing device according to claim 1, characterized in that, The third DC power supply provides power to the wake-up circuit and control circuit within the device under test through the first interface.

4. The handheld testing device according to claim 1, characterized in that, The communication circuit includes: A CAN communication input circuit is connected between the digital controller and the first relay unit; A 485 communication input circuit is connected between the digital controller and the first relay unit, wherein the first relay unit is also connected to the first interface, and the first interface is also used to connect to the communication output port of the device under test.

5. The handheld testing device according to claim 4, characterized in that, When the communication output port of the device under test is a CAN communication port, the first relay unit is in the first state, and the first relay unit connects the CAN communication input circuit to the CAN communication port of the device under test. When the communication output port of the device under test is a 485 communication port, the first relay unit is in the second state, and the first relay unit connects the 485 communication input circuit to the 485 communication port of the device under test.

6. The handheld testing device according to claim 5, characterized in that, The communication circuit also includes: A CAN communication output circuit is connected between the digital controller and the second relay unit; A 485 communication output circuit is connected between the digital controller and the second relay unit, wherein the second relay unit is also connected to the first interface, and the first interface is also used to connect to the communication input port of the device under test.

7. The handheld testing device according to claim 6, characterized in that, When the communication input port of the device under test is a CAN communication port, the second relay unit is in the first state, and the second relay unit connects the CAN communication output circuit to the CAN communication port of the device under test; When the communication output port of the device under test is a 485 communication port, the second relay unit is in the second state, and the second relay unit connects the 485 communication output circuit to the 485 communication port of the device under test.

8. The handheld testing device according to claim 1, characterized in that, The fault detection circuit includes: A fault detection communication input circuit is connected between the digital controller and the first interface, and is used to receive the detection signal output from the communication output port of the device under test; A fault detection communication output circuit is connected between the digital controller and the first interface, and is used to output a detection signal to the communication input port of the device under test.

9. The handheld testing device according to claim 1, characterized in that, The handheld testing device also includes a second interface for connecting to an external storage device, through which the external storage device upgrades the digital controller.

10. The handheld testing device according to claim 1, characterized in that, The DC / DC converter circuit is a bidirectional DC / DC converter circuit. The DC / DC converter circuit is connected to an external power source through the third interface of the detection device. The DC / DC converter circuit converts the DC power provided by the external power source into a battery voltage for charging the battery.

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