Charger automatic test calibration system

Abstract

The utility model discloses an automatic testing and calibrating system for a charger. The automatic testing and calibrating system comprises an electronic load, a first signal conversion module, an upper computer module and a second signal conversion module, the input end of the electronic load is electrically connected with the charger; the output end of the electronic load is electrically connected with the upper computer module through the first signal conversion module; the upper computer module is electrically connected with the charger through the second signal conversion module; in conclusion, real data output by the charger can be accurately obtained by using the electronic load, parameters in the charger can be automatically corrected according to the real data output by the charger and by using a program stored in the upper computer module, and by adopting the test platform, signal level conversion can be automatically carried out, so that the test efficiency is improved. And the calibration test efficiency of the charger is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of automatic debugging, and particularly relates to an automatic test and calibration system for chargers. Background Technique

[0002] In the prior art, the original data of ADC (analog-to-digital conversion) conversion performed on hardware ultimately needs to be converted into values with practical significance to achieve data readability and standardization. One of the most crucial steps in this process is calibration. Currently, two main methods are mainly used for calibration on many single-chip microcomputer platforms: manual calibration and hardware calculation calibration.

[0003] Although the manual calibration method can achieve precise calibration, its disadvantage is that it requires a large amount of manual intervention, resulting in high labor costs and low efficiency. This method not only takes time and effort but is also easily affected by human factors, leading to inconsistencies in calibration results.

[0004] The hardware calculation calibration method relies on the hardware itself to complete the calibration task. This method can theoretically improve the calibration efficiency, but its prerequisite is that the consistency of the hardware must be very high. However, in actual production, it is often difficult to ensure the consistency of the hardware, especially during large-scale mass production. This leads to the consistency and stability of the hardware calculation calibration method in practical applications being difficult to reach an ideal state.

[0005] In summary, the existing calibration methods have obvious limitations and deficiencies in practical applications, and there is an urgent need for a new, more efficient and better-consistent calibration method to solve these problems. Content of the Utility Model

[0006] The purpose of the utility model is to disclose an automatic test and calibration system for chargers, which solves the problems existing in the existing analog-to-digital conversion calibration process.

[0007] To achieve the above purpose, the utility model adopts the following technical solutions:

[0008] An automatic test and calibration system for chargers includes: an electronic load for measuring the real data of the charger, a first signal conversion module for converting the data type of the real data and transmitting the converted real data to the upper computer, an upper computer module for sending a calibration signal according to the converted real data, and a second signal conversion module for converting the data type of the calibration signal and transmitting the converted calibration signal to the charger; the input end of the electronic load is electrically connected to the charger; the output end of the electronic load is electrically connected to the upper computer module through the first signal conversion module; the upper computer module is electrically connected to the charger through the second signal conversion module.

[0009] Optionally, the first signal conversion module specifically includes: a first conversion unit for implementing the mutual conversion between USB level and TTL level, and a second conversion unit for implementing the mutual conversion between TTL level and 485 level; the output end of the electronic load is electrically connected to the host computer module through the second conversion unit and the first conversion unit in sequence.

[0010] Optionally, the first conversion unit includes a first resistor, a second resistor, a first capacitor, a second capacitor, a third capacitor, a first connector for electrically connecting to the host computer module, and a first conversion chip; the first pin of the first conversion chip is grounded; the first pin of the first conversion chip is also electrically connected to the sixteenth pin of the first conversion chip through the second capacitor or the third capacitor respectively; the second pin of the first conversion chip is electrically connected to the second conversion unit through the second resistor; the third pin of the first conversion chip is electrically connected to the second conversion unit through the first resistor; the fourth pin of the first conversion chip is grounded through the first capacitor; the fifth pin of the first conversion chip is electrically connected to the third pin of the first connector; the sixth pin of the first conversion chip is electrically connected to the second pin of the first connector; the first pin of the first connector is electrically connected to the power supply voltage terminal; the fourth pin of the first connector is grounded; the fifteenth pin of the first conversion chip is electrically connected to the second conversion unit; the sixteenth pin of the first conversion chip is also electrically connected to the power supply voltage terminal.

[0011] Optionally, the second conversion unit includes: a first bidirectional transient voltage suppressor diode, a second bidirectional transient voltage suppressor diode, a third bidirectional transient voltage suppressor diode, a sixth capacitor, a seventh capacitor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first inductor, a second inductor, a second connector for electrically connecting to the electronic load, and a second conversion chip; a first pin of the second conversion chip is electrically connected to a power supply voltage terminal; a second pin of the second conversion chip is grounded; the second pin of the second conversion chip is also electrically connected to the first pin of the second conversion chip after passing through the sixth capacitor; a third pin of the second conversion chip is electrically connected to the second pin of the first conversion chip after passing through the second resistor; a fourth pin and a fifth pin of the second conversion chip are both electrically connected to a fifteenth pin of the first conversion chip; a sixth pin of the second conversion chip is electrically connected to a third pin of the first conversion chip after passing through the first resistor; a seventh pin, an eighth pin, and a ninth pin of the second conversion chip are all grounded; an eleventh pin of the second conversion chip is electrically connected to a fifth pin of the second connector; a twelfth pin of the second conversion chip is electrically connected to a fourth pin of the second connector; a thirteenth pin of the second conversion chip is electrically connected to a second pin of the second connector after passing through the fourth resistor and the second inductor in sequence; the thirteenth pin of the second conversion chip is grounded after passing through the fourth resistor and the third bidirectional transient voltage suppressor diode in sequence; a fourteenth pin of the second conversion chip is electrically connected to a first pin of the second connector after passing through the third resistor and the first inductor in sequence; the fourteenth pin of the second conversion chip is grounded after passing through the third resistor and the first bidirectional transient voltage suppressor diode in sequence; the fourteenth pin of the second conversion chip is electrically connected to the thirteenth pin of the second conversion chip after passing through the third resistor, the second bidirectional transient voltage suppressor diode, and the fourth resistor in sequence; a fifteenth pin of the second conversion chip is grounded; a sixteenth pin of the second conversion chip is electrically connected to the power supply voltage terminal; the sixteenth pin of the second conversion chip is also electrically connected to the fifteenth pin of the second conversion chip after passing through the seventh capacitor; a third pin of the second connector is grounded; a first pin of the second connector is also electrically connected to a fourth pin of the second connector after passing through the fifth resistor; a second pin of the second connector is electrically connected to a fifth pin of the second connector after passing through the sixth resistor.

[0012] Optionally, the first signal conversion module further includes: an isolated voltage regulator chip for adjusting the power supply voltage terminal to a 5V voltage terminal, a fourth capacitor, and a fifth capacitor; a first pin of the isolated voltage regulator chip is grounded; a second pin of the isolated voltage regulator chip is electrically connected to the power supply voltage terminal; the second pin of the isolated voltage regulator chip is grounded after passing through the fourth capacitor; a third pin of the isolated voltage regulator chip is grounded; a fourth pin of the isolated voltage regulator chip is electrically connected to the 5V voltage terminal; the fourth pin of the isolated voltage regulator chip is also grounded after passing through the fifth capacitor.

[0013] Optionally, the second signal conversion module specifically includes: a third conversion chip, a seventh resistor, an eighth resistor, a crystal oscillator, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a fourth connector for electrically connecting to the host computer module, and a fifth connector for electrically connecting to the charger; the first pin of the third conversion chip is grounded; the first pin of the third conversion chip is also electrically connected to the sixteenth pin of the third conversion chip after passing through the eighth capacitor or the ninth capacitor; the second pin of the third conversion chip is electrically connected to the first pin of the fourth connector after passing through the seventh resistor; the third pin of the third conversion chip is electrically connected to the second pin of the fourth connector after passing through the eighth resistor; the third pin of the fourth connector is grounded; the fourth pin of the third conversion chip is electrically connected to the 3.3V voltage terminal; the fourth pin of the third conversion chip is also grounded after passing through the tenth capacitor; the fifth pin of the third conversion chip is electrically connected to the third pin of the fourth connector; the sixth pin of the third conversion chip is electrically connected to the second pin of the fourth connector; the first pin of the fourth connector is electrically connected to the 5V voltage terminal; the fourth pin of the fourth connector is grounded; the seventh pin of the third conversion chip is grounded after passing through the eleventh capacitor; the seventh pin of the third conversion chip is also electrically connected to the eighth pin of the third conversion chip through the crystal oscillator; the eighth pin of the third conversion chip is grounded after passing through the twelfth capacitor.

[0014] Optionally, the second signal conversion module further includes: a buck chip for adjusting the 5V voltage terminal to a 3.3V voltage terminal, a thirteenth capacitor, and a fourteenth capacitor; the first pin of the buck chip is grounded; the second pin of the buck chip is grounded after passing through the fourteenth capacitor; the second pin of the buck chip is also electrically connected to the 3.3V voltage terminal; the third pin of the buck chip is electrically connected to the 5V voltage terminal; the third pin of the buck chip is also grounded after passing through the thirteenth capacitor.

[0015] Compared with the prior art, the beneficial effects of the present utility model are:

[0016] The present utility model provides an automatic test and calibration system for a charger, comprising: an electronic load for measuring the real data of the charger, a first signal conversion module for converting the data type of the real data and transmitting the converted real data to an upper computer, an upper computer module for sending a calibration signal according to the converted real data, and a second signal conversion module for converting the data type of the calibration signal and transmitting the converted calibration signal to the charger; the input end of the electronic load is electrically connected to the charger; the output end of the electronic load is electrically connected to the upper computer module through the first signal conversion module; the upper computer module is electrically connected to the charger through the second signal conversion module; in summary, by using the electronic load, the present utility model can accurately obtain the real data output by the charger, and according to the real data output by the charger and using the program stored in the upper computer module, it can automatically correct the parameters in the charger. By adopting the test platform of the present application, signal level conversion can be automatically performed, improving the efficiency of charger calibration and testing. Description of the Drawings

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to these drawings.

[0018] Figure 1 is the system principle block diagram of an automatic test and calibration system for a charger of the present utility model;

[0019] Figure 2 is the circuit schematic diagram of the first signal conversion module;

[0020] Figure 3 is the circuit schematic diagram of the first conversion unit;

[0021] Figure 4 is the circuit schematic diagram of the second conversion unit

[0022] Figure 5 is the circuit schematic diagram of the isolated voltage regulator chip module

[0023] Figure 6 is the circuit schematic diagram of the second signal conversion module;

[0024] Figure 7 is the circuit schematic diagram of the buck unit;

[0025] Figure 8 is the circuit schematic diagram of the MCU communication circuit in the charger;

[0026] In the figure, 1 is the host computer module; 2 is the electronic load; 3 is the charger; 4 is the first signal conversion module; 401 is the first conversion unit; 402 is the second conversion unit; 5 is the second signal conversion module. Specific embodiments

[0027] In the present utility model, unless otherwise clearly defined and limited, terms such as "installation", "connection", "connection", "fixation" and other terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations. The terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features.

[0028] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact of the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over" and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "below", "under" and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature. Terms such as "vertical", "horizontal", "left", "right", "above", "below" and similar expressions are only for the purpose of illustration and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the present utility model.

[0029] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments.

[0030] Embodiment 1

[0031] As Figure 1-8A charger 3 automatic calibration test platform shown in the figure includes: an electronic load 2 for measuring the real data of the charger 3, a first signal conversion module 4 for converting the data type of the real data and transmitting the converted real data to the upper computer, an upper computer module 1 for generating a calibration signal according to the converted real data, and a second signal conversion module 5 for converting the data type of the calibration signal and transmitting the converted calibration signal to the charger 3; the input end of the electronic load 2 is electrically connected to the charger 3; the output end of the electronic load 2 is electrically connected to the upper computer module 1 through the first signal conversion module 4; the upper computer module 1 is electrically connected to the charger 3 through the second signal conversion module 5.

[0032] Specifically, as Figure 1 shown, among them, the upper computer module 1 in this application is specifically a computer device capable of executing a predetermined program, such as a computer, a tablet, an embedded system, etc. A program for execution is stored in the upper computer module 1, and this program can calculate the difference existing in the charger 3 according to the real data detected by the electronic load 2, and calibrate the charger 3 according to the difference existing in the charger 3. In this application, the connection line of the upper computer module 1 uses a USB connector, but the USB level output by the USB connector is not applicable to the single-chip microcomputer, nor is it applicable to the electronic load 2. The level applicable to the single-chip microcomputer is the TTL level, and the level used by the electronic load 2 is the 485 level; therefore, in order to enable the upper computer module 1 to communicate smoothly with the MCU in the electronic load 2 and the charger 3, two signal conversion modules are needed to convert the USB level into the TTL level and the 48 level respectively. To sum up, this application proposes a platform for automatically testing and calibrating the charger 3, using the electronic load 2 to test the charger 3 and transmitting the detected real data to the upper computer, and the upper computer corrects the charger 3 according to the real data, which can automatically complete the calibration process of the charger 3, reduce manual intervention, and improve efficiency and accuracy; it also realizes data type conversion and transmission through the signal conversion module to ensure the accuracy and integrity of the data.

[0033] Furthermore, as Figure 2 shown, the first signal conversion module 4 specifically includes: a first conversion unit 401 for realizing the mutual conversion between the USB level and the TTL level, and a second conversion unit 402 for realizing the mutual conversion between the TTL level and the 485 level; the output end of the electronic load 2 is electrically connected to the upper computer module 1 in sequence through the second conversion unit 402 and the first conversion unit 401.

[0034] Furthermore, as Figure 3As shown, the first conversion unit 401 includes a first resistor R1, a second resistor R2, a first capacitor C1, a second capacitor C2, a third capacitor C3, a first connector J1 for electrically connecting to the host computer module 1, and a first conversion chip U1; the first pin of the first conversion chip U1 is grounded; the first pin of the first conversion chip U1 is also electrically connected to the sixteenth pin of the first conversion chip U1 after passing through the second capacitor C2 or the third capacitor C3 respectively; the second pin of the first conversion chip U1 is electrically connected to the second conversion unit 402 after passing through the second resistor R2; the third pin of the first conversion chip U1 is electrically connected to the second conversion unit 402 after passing through the first resistor R1; the fourth pin of the first conversion chip U1 is grounded after passing through the first capacitor C1; the fifth pin of the first conversion chip U1 is electrically connected to the third pin of the first connector J1; the sixth pin of the first conversion chip U1 is electrically connected to the second pin of the first connector J1; the first pin of the first connector J1 is electrically connected to the power supply voltage terminal VCC; the fourth pin of the first connector J1 is grounded; the fifteenth pin of the first conversion chip U1 is electrically connected to the second conversion unit 402; the sixteenth pin of the first conversion chip U1 is also electrically connected to the power supply voltage terminal.

[0035] In this application, the first conversion chip U1 uses a chip with the model CH340B, and the first conversion chip U1 can convert the USB level output by the host computer module into the TTL level recognizable by the single-chip microcomputer.

[0036] Further, as Figure 4As shown, the second conversion unit 402 includes: a first bidirectional transient voltage suppressor diode D1, a second bidirectional transient voltage suppressor diode D2, a third bidirectional transient voltage suppressor diode D3, a sixth capacitor C6, a seventh capacitor C7, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a first inductor B1, a second inductor B2, a second connector J2 for electrically connecting to the electronic load 2, and a second conversion chip U2; the first pin of the second conversion chip U2 is electrically connected to the power supply voltage terminal VCC; the second pin of the second conversion chip U2 is grounded; the second pin of the second conversion chip U2 is also electrically connected to the first pin of the second conversion chip U2 after passing through the sixth capacitor C6; the third pin of the second conversion chip U2 is electrically connected to the second pin of the first conversion chip after passing through the second resistor; the fourth and fifth pins of the second conversion chip U2 are both electrically connected to the fifteenth pin of the first conversion chip; the sixth pin of the second conversion chip U2 is electrically connected to the third pin of the first conversion chip after passing through the first resistor; the seventh, eighth, and ninth pins of the second conversion chip U2 are all grounded; the eleventh pin of the second conversion chip U2 is electrically connected to the fifth pin of the second connector J2; the twelfth pin of the second conversion chip U2 is electrically connected to the fourth pin of the second connector J2; the thirteenth pin of the second conversion chip U2 is sequentially electrically connected to the second pin of the second connector J2 after passing through the fourth resistor R4 and the second inductor B2; the thirteenth pin of the second conversion chip U2 is grounded after passing through the fourth resistor R4 and the third bidirectional transient voltage suppressor diode D3; the fourteenth pin of the second conversion chip U2 is sequentially electrically connected to the first pin of the second connector J2 after passing through the third resistor R3 and the first inductor B1; the fourteenth pin of the second conversion chip U2 is grounded after passing through the third resistor R3 and the first bidirectional transient voltage suppressor diode D1; the fourteenth pin of the second conversion chip U2 is electrically connected to the thirteenth pin of the second conversion chip U2 after passing through the third resistor R3, the second bidirectional transient voltage suppressor diode D2, and the fourth resistor R4; the fifteenth pin of the second conversion chip U2 is grounded; the sixteenth pin of the second conversion chip U2 is electrically connected to the power supply voltage terminal; the sixteenth pin of the second conversion chip U2 is also electrically connected to the fifteenth pin of the second conversion chip U2 after passing through the seventh capacitor C7; the third pin of the second connector J2 is grounded; the first pin of the second connector J2 is also electrically connected to the fourth pin of the second connector J2 after passing through the fifth resistor R5; the second pin of the second connector J2 is electrically connected to the fifth pin of the second connector J2 after passing through the sixth resistor R6.

[0037] Specifically, in the present application, the second conversion chip U2 uses an isolated transceiver with the model number CA-IS3080. This chip has a high electrical isolation level and can meet the stringent requirements of industrial application scenarios. The logic input and output buffers inside this series of devices are isolated by a silicon dioxide (SiO2) insulating gate, which can withstand an electrical isolation of up to 5000Vrms (60s), helping to reduce interference between ports with a relatively high ground potential difference and ensuring the correct transmission of data. Moreover, the CA-IS3080 is a full-duplex transceiver that can transmit signals simultaneously on two lines without mutual interference, effectively ensuring the stability of the device.

[0038] Further, as Figure 5 shown, the first signal conversion module 4 further includes: an isolated voltage regulator chip U3 for adjusting the power supply voltage terminal to a 5V voltage terminal, a fourth capacitor C4, and a fifth capacitor C5; the first pin of the isolated voltage regulator chip U3 is grounded; the second pin of the isolated voltage regulator chip U3 is electrically connected to the power supply voltage terminal VCC; the second pin of the isolated voltage regulator chip U3 is grounded through the fourth capacitor C4; the third pin of the isolated voltage regulator chip U3 is grounded; the fourth pin of the isolated voltage regulator chip U3 is electrically connected to the 5V voltage terminal; the fourth pin of the isolated voltage regulator chip U3 is also grounded through the fifth capacitor C5. Specifically, the isolated voltage regulator chip uses a DC-DC ISO chip, which can achieve voltage isolation while adjusting the voltage, avoiding the mutual influence of the front and rear voltages on the data accuracy.

[0039] Further, as Figure 6As shown in the figure, the second signal conversion module 5 specifically includes: a third conversion chip U3, a seventh resistor R7, an eighth resistor R8, a crystal oscillator Y, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a fourth connector J4 for electrically connecting to the host computer module 1, and a fourth connector J4 for electrically connecting to the charger 3; the first pin of the third conversion chip U3 is grounded; the first pin of the third conversion chip U3 is also electrically connected to the sixteenth pin of the third conversion chip U3 through the eighth capacitor C8 or the ninth capacitor C9; the second pin of the third conversion chip U3 is electrically connected to the first pin of the fourth connector J4 through the seventh resistor R7; the third pin of the third conversion chip U3 is electrically connected to the second pin of the fourth connector J4 through the eighth resistor R8; the third pin of the fourth connector J4 is grounded; the fourth pin of the third conversion chip U3 is electrically connected to the 3.3V voltage terminal; the fourth pin of the third conversion chip U3 is also grounded through the tenth capacitor C10; the fifth pin of the third conversion chip U3 is electrically connected to the third pin of the fourth connector J4; the sixth pin of the third conversion chip U3 is electrically connected to the second pin of the fourth connector J4; the first pin of the fourth connector J4 is electrically connected to the 5V voltage terminal; the fourth pin of the fourth connector J4 is grounded; the seventh pin of the third conversion chip U3 is grounded through the eleventh capacitor C11; the seventh pin of the third conversion chip U3 is also electrically connected to the eighth pin of the third conversion chip U3 through the crystal oscillator Y; the eighth pin of the third conversion chip U3 is grounded through the twelfth capacitor C12.

[0040] Further, as Figure 7 shown, the second signal conversion module 5 further includes: a buck chip for adjusting the 5V voltage terminal to a 3.3V voltage terminal, a thirteenth capacitor C13, and a fourteenth capacitor C14; the first pin of the buck chip U5 is grounded; the second pin of the buck chip is grounded through the fourteenth capacitor; the second pin of the buck chip is also electrically connected to the 3.3V voltage terminal; the third pin of the buck chip is electrically connected to the 5V voltage terminal; the third pin of the buck chip is also grounded through the thirteenth capacitor.

[0041] In this embodiment, the buck chip uses a buck chip with a signal of AMS1117. The buck chip can reduce the 5V voltage to 3.3V voltage to meet the working requirements of components with different voltage requirements. Voltage adjustment and filtering are performed through multiple capacitors to further improve the stability and reliability of the power supply.

[0042] Further, as Figure 8 shown, the present application further provides an MCU communication circuit applied to a charger. The MCU communication circuit is communicatively connected to the second signal conversion module through a connector.

[0043] In summary, the present application provides an automatic calibration test platform. By using an electronic load, the present utility model can accurately obtain the real data output by the charger. According to the real data output by the charger and using the program stored in the host computer module, the parameters in the charger can be automatically corrected. By adopting the test platform of the present application, signal level conversion can be automatically performed, effectively improving productivity. For batch products, only a very small number of steps are required to complete the debugging required for production. Even when changing the product model, it can be quickly switched through the PC. The entire solution simplifies the calibration, has a simple operation, and can effectively reduce the learning cost of workers.

[0044] The present utility model is not limited to the above embodiments. If various modifications or variations of the present utility model do not depart from the spirit and scope of the present utility model, and provided that these modifications and variations fall within the scope of the claims of the present utility model and equivalent technical scope, then the present utility model also intends to include these modifications and variations.

Claims

1. A charger automatic test and calibration system, characterized in that: include: An electronic load for measuring real data of the charger, a first signal conversion module for converting the data type of the real data and transmitting the converted real data to a host computer, a host computer module for issuing a calibration signal according to the converted real data, and a second signal conversion module for converting the data type of the calibration signal and transmitting the converted calibration signal to the charger; The input end of the electronic load is electrically connected to the charger; The output end of the electronic load is electrically connected to the host computer module through the first signal conversion module; The host computer module is electrically connected to the charger through the second signal conversion module.

2. The charger automatic testing and calibration system according to claim 1, characterized in that: The first signal conversion module specifically includes: a first conversion unit for realizing mutual conversion between USB level and TTL level and a second conversion unit for realizing mutual conversion between TTL level and 485 level; The output end of the electronic load is electrically connected to the host computer module after passing through the second conversion unit and the first conversion unit in sequence.

3. A charger automatic testing and calibration system according to claim 2, characterized in that: The first conversion unit includes a first resistor, a second resistor, a first capacitor, a second capacitor, a third capacitor, a first connector for electrically connecting to the host computer module, and a first conversion chip; The first pin of the first conversion chip is grounded; the first pin of the first conversion chip is also electrically connected to the sixteenth pin of the first conversion chip through the second capacitor or the third capacitor; The second pin of the first conversion chip is electrically connected to the second conversion unit through the second resistor; The third pin of the first conversion chip is electrically connected to the second conversion unit through the first resistor; The fourth pin of the first conversion chip is grounded after passing through the first capacitor; The fifth pin of the first conversion chip is electrically connected to the third pin of the first connector; The sixth pin of the first conversion chip is electrically connected to the second pin of the first connector; the first pin of the first connector is electrically connected to the power supply voltage terminal; the fourth pin of the first connector is grounded; The fifteenth pin of the first conversion chip is electrically connected to the second conversion unit; The sixteenth pin of the first conversion chip is also electrically connected to the power supply voltage terminal.

4. The charger automatic testing and calibration system according to claim 3, characterized in that: The second conversion unit includes: a first bidirectional transient suppression diode, a second bidirectional transient suppression diode, a third bidirectional transient suppression diode, a sixth capacitor, a seventh capacitor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a first inductor, a second inductor, a second connector for electrically connecting to the electronic load, and a second conversion chip; The first pin of the second conversion chip is electrically connected to the power supply voltage terminal; The second pin of the second conversion chip is grounded; the second pin of the second conversion chip is also electrically connected to the first pin of the second conversion chip through the sixth capacitor; The third pin of the second conversion chip is electrically connected to the second pin of the first conversion chip through the second resistor; The fourth pin and the fifth pin of the second conversion chip are both electrically connected to the fifteenth pin of the first conversion chip; The sixth pin of the second conversion chip is electrically connected to the third pin of the first conversion chip through the first resistor; The seventh pin, the eighth pin and the ninth pin of the second conversion chip are all grounded; The eleventh pin of the second conversion chip is electrically connected to the fifth pin of the second connecting member; The twelfth pin of the second conversion chip is electrically connected to the fourth pin of the second connecting member; The thirteenth pin of the second conversion chip is electrically connected to the second pin of the second connector through the fourth resistor and the second inductor in sequence; the thirteenth pin of the second conversion chip is grounded through the fourth resistor and the third bidirectional transient suppression diode in sequence; The fourteenth pin of the second conversion chip is electrically connected to the first pin of the second connector through the third resistor and the first inductor in sequence; the fourteenth pin of the second conversion chip is grounded through the third resistor and the first bidirectional transient suppression diode in sequence; The fourteenth pin of the second conversion chip is electrically connected to the thirteenth pin of the second conversion chip through the third resistor, the second bidirectional transient suppression diode and the fourth resistor in sequence; The fifteenth pin of the second conversion chip is grounded; The sixteenth pin of the second conversion chip is electrically connected to the power supply voltage terminal; the sixteenth pin of the second conversion chip is also electrically connected to the fifteenth pin of the second conversion chip through the seventh capacitor; The third pin of the second connector is grounded; the first pin of the second connector is electrically connected to the fourth pin of the second connector through the fifth resistor; the second pin of the second connector is electrically connected to the fifth pin of the second connector through the sixth resistor.

5. The charger automatic testing and calibration system according to claim 4, characterized in that: The first signal conversion module further includes: an isolation voltage stabilizing chip, a fourth capacitor and a fifth capacitor for adjusting the power supply voltage end to a 5V voltage end; The first pin of the isolation voltage stabilizing chip is grounded; The second pin of the isolation voltage stabilizing chip is electrically connected to the power supply voltage terminal; the second pin of the isolation voltage stabilizing chip is grounded after passing through a fourth capacitor; The third pin of the isolation voltage stabilizing chip is grounded; The fourth pin of the isolation voltage stabilizing chip is electrically connected to the 5V voltage terminal; the fourth pin of the isolation voltage stabilizing chip is also grounded after passing through a fifth capacitor.

6. The charger automatic testing and calibration system according to claim 1, characterized in that: The second signal conversion module specifically includes: a third conversion chip, a seventh resistor, an eighth resistor, a crystal oscillator, an eighth capacitor, a ninth capacitor, a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a fourth connector for electrically connecting to the host computer module, and a fifth connector for electrically connecting to the charger; The first pin of the third conversion chip is grounded; the first pin of the third conversion chip is also electrically connected to the sixteenth pin of the third conversion chip through the eighth capacitor or the ninth capacitor; The second pin of the third conversion chip is electrically connected to the first pin of the fourth connector through the seventh resistor; The third pin of the third conversion chip is electrically connected to the second pin of the fourth connector through the eighth resistor; the third pin of the fourth connector is grounded; The fourth pin of the third conversion chip is electrically connected to the 3.3V voltage terminal; the fourth pin of the third conversion chip is also grounded after passing through the tenth capacitor; The fifth pin of the third conversion chip is electrically connected to the third pin of the fourth connector; The sixth pin of the third conversion chip is electrically connected to the second pin of the fourth connector; The first pin of the fourth connector is electrically connected to the 5V voltage terminal; the fourth pin of the fourth connector is grounded; The seventh pin of the third conversion chip is grounded through the eleventh capacitor; the seventh pin of the third conversion chip is also electrically connected to the eighth pin of the third conversion chip through a crystal oscillator; the eighth pin of the third conversion chip is grounded through the twelfth capacitor.

7. The charger automatic testing and calibration system according to claim 6, characterized in that: The second signal conversion module also includes: a step-down chip, a thirteenth capacitor, and a fourteenth capacitor for adjusting the 5V voltage end to the 3.3V voltage end; the first pin of the step-down chip is grounded; the second pin of the step-down chip is grounded after passing through the fourteenth capacitor; the second pin of the step-down chip is also electrically connected to the 3.3V voltage end; the third pin of the step-down chip is electrically connected to the 5V voltage end; the third pin of the step-down chip is also grounded after passing through the thirteenth capacitor.

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