Performance detection circuit and detection equipment for charger to be detected

Abstract

The utility model discloses a to-be-detected charger performance detection circuit and detection equipment. The to-be-detected charger performance detection circuit comprises a constant voltage module, a charging control module and a state detection module. Wherein the input end of the constant voltage module is connected with commercial power, and the constant voltage module is connected with the charging control module; the constant voltage module is used for providing electric energy for the post-stage module and outputting detection voltage to the charging control module; the charging control module is connected with the state detection module and is used for adjusting and outputting the detection voltage to a state regulation and control end of the state detection module; the state detection module is used for being connected with a charger to be detected, adjusting the corresponding charging state of the charger to be detected through the detection voltage, and collecting the working parameters of the charger to be detected in the corresponding charging state. By simulating the charging state of the battery, various parameters of the charging state of the charger are visually detected, the charging safety is guaranteed, and the maintenance efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of power supply technology, and in particular to a circuit and device for testing the performance of a charger under test. Background Technology

[0002] Currently, the number of electric vehicles in use is enormous. Electric bicycles are convenient and inexpensive, making them an indispensable means of transportation. During use, each electric bicycle is equipped with at least one or two chargers under test to meet battery charging needs. Due to the high failure rate of these chargers, the frequency of damage during production, sales, and use is high, resulting in a significant amount of testing and repair work. However, existing testing methods only determine whether the charger is working properly by measuring its output voltage and current. They do not test whether the charger can function properly under various charging conditions, such as trickle charging, constant current charging, constant voltage charging, and charging with the charger disconnected. This testing method poses safety hazards, potentially leading to overcharging, incomplete charging, and excessive current charging during use.

[0003] Therefore, existing technologies still need to be improved and developed. Utility Model Content

[0004] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a test circuit and test equipment for the performance of a charger under test. It uses a constant voltage module and an adjustable resistor to simulate the charging state of a battery, and detects whether the charging voltage and current values ​​of the charger under test are within the specified range during the three stages of charging, and whether the charger under test automatically cuts off power when the battery is fully charged. It can intuitively detect various parameters of the charger's charging state, avoid the drawbacks of improper testing, overcharging, undercharging, and high-current charging of abnormal chargers during use, ensure charging safety, and improve maintenance efficiency.

[0005] The technical solution of this utility model is as follows:

[0006] A performance testing circuit for a charger under test includes: a constant voltage module, a charging control module, and a status detection module; wherein,

[0007] The input terminal of the constant voltage module is connected to the mains power, and the constant voltage module is connected to the charging control module; the constant voltage module is used to provide power to the downstream modules and output detection voltage to the charging control module;

[0008] The charging control module is connected to the status detection module and is used to adjust and output the detection voltage to the status control terminal of the status detection module.

[0009] The status detection module is used to connect to the charger under test, adjust the corresponding charging status of the charger under test through the detection voltage, and collect the operating parameters of the charger under test under the corresponding charging status.

[0010] In a further embodiment of this invention, the charging control module includes: a first adjustable resistor, a second variable-range resistor, a first voltage detector, a first diode, and a first switch; wherein,

[0011] One end of the first adjustable resistor is connected to the first power output terminal of the constant voltage module, the other end of the first adjustable resistor is connected to one end of the second variable range resistor, the first output terminal of the second variable range resistor is connected to one end of the first voltage detector, and the second output terminal of the second variable range resistor is connected to the other end of the first voltage detector.

[0012] The anode of the first diode is connected to one end of the first voltage meter, the cathode of the first diode is connected to one end of the first switch, and the other end of the first switch is connected to the status detection module; the common terminal of the first voltage meter and the second output terminal of the second variable range resistor is connected to the status detection module.

[0013] In a further embodiment of this invention, the state detection module includes: a third adjustable resistor, a first current meter, a second voltage meter, and an input plug; wherein,

[0014] One end of the third adjustable resistor is connected to the first end of the first current sensor, and the other end of the third adjustable resistor is connected to one end of the input plug and the charging control module respectively; the second end of the first current sensor is connected to the other end of the input plug.

[0015] One end of the second voltage meter is connected to the common terminal of the input plug and the third adjustable resistor, and the other end of the second voltage meter is connected to the common terminal of the input plug and the first current meter.

[0016] A further feature of this invention includes a heat dissipation device; the first end and the second end of the heat dissipation device are respectively connected to the third power input terminal and the third power output terminal of the constant voltage module, and the heat dissipation device is used to dissipate heat from the third adjustable resistor.

[0017] A further feature of this invention is that the first current sensor and the second voltage sensor are digital ammeters and digital voltmeters, respectively, and the first current sensor and the second voltage sensor require independent power supplies; wherein,

[0018] The first power supply terminal of the first current meter is connected to the second power input terminal of the constant voltage module, and the second power supply terminal of the first current meter is connected to the second power output terminal of the constant voltage module; the first detection terminal of the first current meter is connected to one end of the third adjustable resistor, and the second detection terminal of the first current meter is connected to the other end of the input plug.

[0019] The first power supply terminal of the second voltage meter is connected to the second power input terminal of the constant voltage module, and the second power supply terminal of the second voltage meter is connected to the second power output terminal of the constant voltage module. The first detection terminal of the second voltage meter is connected to the common terminal of the input plug and the third adjustable resistor, and the second detection terminal of the second voltage meter is connected to the common terminal of the input plug and the first current meter.

[0020] In a further embodiment of this invention, the first current detector and the second voltage detector are DSN-VC288 DC current and voltage meters.

[0021] In a further embodiment of this invention, the constant voltage module includes a constant voltage power supply, which is connected to both the charging control module and the status detection module.

[0022] This utility model also provides a device for testing the performance of a charger under test, which includes the aforementioned device for testing the performance of a charger under test, wherein the charging port of the device is connected to the charger under test.

[0023] This utility model provides a test circuit and testing device for a charger under test, comprising: a test circuit for a charger under test, which includes: a constant voltage module, a charging control module, and a status detection module; wherein, the input terminal of the constant voltage module is connected to the mains power, and the output terminal of the constant voltage module is connected to the charging control module; the constant voltage module is used to provide power to each module and output the detection voltage to the charging control module; the charging control module is connected to the status detection module and is used to adjust the output detection voltage of the status detection module; the status control terminal of the status detection module is connected to the second power input terminal and the second power output terminal of the constant voltage module, and is used to connect to the charger under test to collect the operating parameters of the charger under test under the corresponding charging state.

[0024] This utility model discloses a performance testing circuit and a performance testing device for a charger under test. By combining a constant voltage module and a discharge resistor to simulate the charging state of a battery, it detects the charging parameters of the battery charger at different stages of charging, identifies abnormal chargers that are overcharged, undercharged, or have high current charging states, and ensures charging safety in daily use. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art 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 the structures shown in these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of a circuit for testing the performance of a charger under test according to this utility model.

[0027] Figure 2 This is a circuit structure diagram of a performance testing circuit for a charger under test according to this utility model.

[0028] The markings in the attached diagram are as follows: 100, constant voltage module; 200, charging control module; 300, status detection module. Detailed Implementation

[0029] This utility model provides a circuit and testing device for testing the performance of a charger under test. To make the purpose, technical solution, and effects of this utility model clearer and more explicit, the following describes this utility model in further detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit this utility model.

[0030] In the implementation methods and claims, unless otherwise specified in the text, the terms "a," "an," "the," and "the" may also include plural forms. If the embodiments of this utility model involve descriptions of "first," "second," etc., such descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0031] It should be further understood that the term "comprising" as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is "connected" or "coupled" to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, "connected" or "coupled" as used herein can include wireless connections or wireless coupling. The term "and / or" as used herein includes all or any unit and all combinations of one or more associated listed items.

[0032] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0033] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0034] like Figure 1 The diagram shows a performance testing circuit for a charger under test, comprising: a constant voltage module 100, a charging control module 200, and a status detection module 300. The constant voltage module 100 is connected to AC power at its input terminal and is also connected to the charging control module 200. The constant voltage module 100 provides power to subsequent modules and outputs the detection voltage to the charging control module 200. The charging control module 200 is connected to the status detection module 300 and adjusts and outputs the detection voltage to the status control terminal of the status detection module 300. The status control terminal of the status detection module 300 is connected to the second power input terminal and the second power output terminal of the constant voltage module 100, and is used to connect to the charger under test to collect operating parameters of the charger under test under the corresponding charging state.

[0035] Specifically, the electric vehicle charger under test performs AC-DC conversion, receiving AC power input and converting it into DC power. To protect the battery and the charger under test, in existing technology, the charger under test adjusts its charging state according to the amount of charge received by the battery. Currently, chargers are mainly three-stage chargers. When the charger under test starts working, it enters a trickle charging state, where the output of the charger under test performs low-voltage pre-charging. At this time, the charging current is one-tenth of the set current, thereby preventing overcharging and over-discharging of the battery and improving battery life. When the charging current reaches the set current, it is the maximum current, and the charger under test performs constant current charging at the maximum charging current. Furthermore, when the charger under test reaches the maximum charging voltage, it continues to perform constant voltage charging at the maximum charging voltage, and the charging current gradually decreases until it reaches the trickle current.

[0036] The status detection module 300 is connected to the output terminal of the charger under test. The constant voltage module 100, charging control module 200, and status detection module 300 are used to simulate the battery during the charging process. The first power output terminal of the constant voltage module 100 outputs a detection voltage to the charging control module 200. The charging control module 200 is used to adjust the detection voltage and detection current in the status detection module 300 to eliminate the error values ​​between the detection voltage and the preset voltage, and between the detection current and the preset current. The specific settings of the preset voltage and preset current values ​​are determined by the nominal values ​​of the charger under test in the current detected charging state. The constant voltage module 100 outputs the voltage value corresponding to the charging state when the charger under test is connected to the battery, as simulated by the charging control module 200. In daily use, when the charger under test charges the electric vehicle battery, the current battery level varies, resulting in different charging voltages and currents, and the charging state of the charger under test will also change accordingly. Therefore, the constant voltage module 100 and the charging control module 200 can simulate the states of electric vehicle batteries with different charge levels, control the voltage at the output terminal of the charger under test, and thus detect the charging voltage and charging current at the output terminal of the charger under test. Specifically, the charging control module 200 adjusts the voltage output of the state detection module 300, and by adjusting the detection voltage applied to the output terminal of the charger under test, it simulates the battery voltage at different charging states during the charging process, and controls the charger under test to be in the corresponding charging state. At this time, the state detection module 300 is used to detect the charging parameters of the charger under test in the corresponding charging state, intuitively showing whether the current charging state of the charger under test is working normally and whether maintenance is required, thus expanding the functionality of the performance testing device.

[0037] Please refer to this as well. Figure 1 and Figure 2 In some preferred embodiments, the constant voltage module 100 includes a constant voltage power supply UR1. The power input terminal of the constant voltage power supply UR1 is connected to a 220V AC mains power supply, and the first output terminal of the constant voltage power supply UR1 is connected to the charging control module 200. The constant voltage module 100 is used to provide power to subsequent modules in the circuit. The constant voltage power supply UR1 is model SRG1000C-11H, with an input voltage of AC220V, an output voltage of 100V, and outputs a detection voltage for simulating battery voltage.

[0038] Furthermore, the constant voltage module 100 also includes a first power switch Ka1, one end of which is connected to 220V AC mains power, and the other end of which is connected to the power input terminal of the constant voltage power supply UR1, for controlling the opening and closing of the boost power supply module.

[0039] Furthermore, please refer to the same... Figure 1 and Figure 2The charging control module 200 includes: a first adjustable resistor R1, a second variable-range resistor R2, a first voltage detector U1, a first diode D1, and a first switch K1; wherein, one end of the first adjustable resistor R1 is connected to the first power output terminal of the constant voltage module 100, the other end of the first adjustable resistor R1 is connected to one end of the second variable-range resistor R2, the first output terminal of the second variable-range resistor R2 is connected to one end of the first voltage detector U1, and the second output terminal of the second variable-range resistor R2 is connected to the other end of the first voltage detector U1; the anode of the first diode D1 is connected to one end of the first voltage detector U1, the cathode of the first diode D1 is connected to one end of the first switch K1, and the other end of the first switch K1 is connected to the status detection module 300; the common terminal of the first voltage detector U1 and the second output terminal of the second variable-range resistor R2 is connected to the status detection module 300.

[0040] Specifically, when the charger under test is not connected, the second variable-range resistor R2 adjusts its resistance according to the nominal voltage of the battery charger under test to eliminate the error between the detected voltage and the nominal voltage. Testing of the charger under test begins. The input terminal of the charger under test is connected to a 220V AC mains power supply, and the output terminal of the charger under test is connected to the status detection module 300. The first adjustable resistor R1 is used to adjust the detected voltage to simulate voltage changes during charging. The first diode D1 is used to isolate the constant voltage power supply UR1 from the voltage of the charger under test from the output terminal of the charger under test, preventing reverse current from the charger under test from burning out the constant voltage module 100. The output terminal of the charger under test provides a trigger voltage for the reverse connection / reverse current protection circuit of the charger under test, providing the operating conditions for the charger output.

[0041] Further, the status detection module 300 includes: a third adjustable resistor R3, a first current meter A1, a second voltage meter U2, and an input plug XS1; one end of the third adjustable resistor R3 is connected to the first end of the first current meter A1, and the other end of the third adjustable resistor R3 is connected to one end of the input plug XS1 and the charging control module 200 respectively; the second end of the first current meter A1 is connected to the other end of the input plug XS1; one end of the second voltage meter U2 is connected to the common terminal of the input plug XS1 and the third adjustable resistor R3, and the other end of the second voltage meter U2 is connected to the common terminal of the input plug XS1 and the first current meter A1. The input plug XS1 is connected to the output terminal of the charger under test, and the third adjustable resistor R3 is used to select the resistance value range required for detecting the battery voltage and is used as the load of the charger under test. The input plug XS1 is used to connect to the output terminal of an external charger under test. When the charger under test is connected to the input plug, the first current detector A1 and the second voltage detector U2 detect the charging parameters such as the charging voltage and charging current at the current charging state.

[0042] In a further embodiment of a preferred embodiment of this utility model, the first current sensor A1 and the second voltage sensor U2 are DSN-VC288 DC current and voltage meters. The first current sensor A1 and the second voltage sensor U2 require independent power supplies. The first terminal of the first current sensor A1 is connected to the second power input terminal of the constant voltage module 100, and the second terminal of the first current sensor A1 is connected to the second power output terminal of the constant voltage module 100. The first terminal of the second voltage sensor U2 is connected to the second power input terminal of the constant voltage module 100, and the second terminal of the second voltage sensor U2 is connected to the second power output terminal of the constant voltage module 100. The first current sensor A1 and the second voltage sensor U2 are used to display the voltage and current values ​​output by the charger under test. The constant voltage module 100 provides a 5V operating voltage to the DC current and voltage meters, and the second voltage sensor U2 is used to display the adjustable constant voltage operating voltage value provided by the constant voltage power supply UR1 to the output terminal of the charger under test and the third adjustable resistor R3.

[0043] In a further embodiment of some preferred embodiments, the present invention further includes a heat dissipation device FN1; the heat dissipation device FN1 may be a heat sink, a cooling fan, and an electric cooling device. The first and second ends of the heat dissipation device FN1 are respectively connected to the third power input terminal and the third power output terminal of the constant voltage module 100. In the present invention, the heat dissipation device FN1 is a cooling fan, and the constant voltage module 100 provides a constant 12-volt operating voltage to the cooling fan to achieve rapid internal heat dissipation, reduce the temperature of the third adjustable resistor R3 when it is working as a load, and extend the service life of the charger.

[0044] The constant voltage power supply UR1 provides a constant 5V operating voltage to the first current sensor A1 and the second voltage sensor U2, a constant 12V operating voltage to the cooling fan, and a constant voltage operating voltage to the output terminals of the first voltage sensor U1 and the charger under test. A first adjustable resistor R1 and a second variable range resistor R2 are connected in series. One end of the first adjustable resistor R1 is installed at the positive terminal of the constant voltage power supply UR1 to select the voltage of the battery and the battery charging state voltage. The second variable range resistor R2 is used to select the voltage of the battery charger and adjust the battery charging state voltage. Specifically, one end of the second variable range resistor R2 connected to the voltage divider is connected in series with the first adjustable resistor R1 and the first diode D1 to adjust the detection voltage of the charger under test. One end of the redundant resistor of the second variable range resistor R2 and the common terminal of the other end of the third adjustable resistor R3 are connected to the first power input terminal of the constant voltage power supply UR1.

[0045] When the charging status of the charger under test is detected, one end of the redundant resistor of the second variable range resistor R2 is equivalent to being connected in parallel with the third adjustable resistor R3. This is used to shunt the load current flowing through the third adjustable resistor R3, thereby reducing the heat generated by the third adjustable resistor R3, reducing the temperature of the third adjustable resistor R3 itself when it is working as a load, and extending the service life of the charger. The first diode D1 is used to isolate the voltage of the constant voltage power supply UR1 from the output terminal of the charger under test; the first switch K1 is used to control the conduction and cutoff between the constant voltage power supply UR1, the third adjustable resistor R3, and the power supply circuit of the output terminal of the charger under test. When the first switch K1 is turned on, the constant voltage power supply UR1 supplies power to the charging control module 200 and the status detection module 300 through the first power output terminal, and provides a trigger voltage to the reverse connection protection / reverse flow protection circuit of the charger under test through the output terminal of the charger under test; when the first switch K1 is turned off, the output terminal of the constant voltage power supply UR1 is isolated from the charging control module 200, the status detection module 200, and the charger under test. At this time, the first current meter A1 detects the output current of the charger under test under its natural operating state.

[0046] The following example uses a charger for a 13-cell 48V ternary lithium battery pack to illustrate the specific testing process for the charger under test.

[0047] The 13-cell 48V ternary lithium battery charger has an input voltage of 180-240V / AC 50-60Hz, a nominal output voltage of 54.6V, a nominal current of 2.0A, a discharge cutoff voltage of 39V, and a maximum charging voltage of 42V. The 13-cell 48V ternary lithium battery charger is a three-stage charger, and the charging process is: trickle charging; constant current charging; constant voltage charging.

[0048] Adjust the third adjustable resistor R3 to change its resistance value and select the corresponding range of the nominal voltage of the charger under test; adjust the second variable range resistor R2 to select the corresponding range of the nominal voltage of the charger under test, the first switch K1 is turned off, the first power switch Ka1 is turned on, and the first current detector A1, the second voltage detector U2, and the heat dissipation device FN1 enter the charging state.

[0049] Adjust the first adjustable resistor R1 until the first voltage meter U1 displays 48 volts. Turn on the first switch K1 and connect the output terminal of the charger under test to the output terminal of the charger under test. Connect the input terminal of the charger under test to a 220 volt AC power supply to begin testing the charger under test. At this time, the first current meter A1 and the second voltage meter U2 will display the charging current and charging voltage output by the charger under test, indicating that the charger under test has started working; otherwise, the charger under test is faulty.

[0050] The charger under test starts working. At this time, the first switch K1 is open. Adjust the third adjustable resistor R3 and observe the first current sensor A1 until the charging current increases to its maximum value. At this time, the value of the first current sensor A1 should be the maximum output current value of the charger under test, that is, the nominal charging current value of 2A. Compare the current detection value with the value marked on the nameplate of the charger under test. If the current detection value is within the error range of the value marked on the nameplate of the charger under test, it means that the charger under test is normal; otherwise, it is faulty.

[0051] Subsequently, adjust the third adjustable resistor R3, change its resistance value, select the nominal voltage range of the battery under test, turn on the first switch K1, and gradually decrease the detection voltage output by the constant voltage power supply UR1 by adjusting the first adjustable resistor R1 to simulate the minimum operating voltage value of the charger under test. The minimum operating voltage of a ternary lithium battery is the product of the minimum operating voltage value of a single cell and the number of cells in the battery pack. At this time, the minimum voltage of a single cell is 3 volts, and a 48-volt battery pack has 13 cells in series. When the first voltage detection meter U1 displays the voltage under test as U1 = 3 * 13 = 39V, that is, when the voltage under test is lower than the discharge cutoff voltage, the charger under test is operating at the minimum operating voltage value and performing trickle charging. In trickle charging mode, the trickle charging current should be one-tenth of the nominal charging current value. The nominal current is 2A, that is, when the first current detection meter A1 displays a trickle charging current of 0.2A, the charger under test is performing normal low-voltage pre-charging; otherwise, the charger under test has a trickle charging failure.

[0052] Adjust the first adjustable resistor R1 to gradually increase the detection voltage output of the constant voltage power supply UR1, so that the value displayed by the first voltage detection meter U1 is greater than the minimum charging voltage of 39 volts and less than the maximum charging voltage of 42 volts. The first current detection meter A1 should display the nominal current of the charger under test as constant at 2A. The charger under test enters the standard constant current charging process; otherwise, the charger under test is faulty.

[0053] Adjust the first adjustable resistor R1 to gradually increase the detection voltage output of the constant voltage power supply UR1. When the first voltage detection meter U1 displays about 42 volts, the first current detection meter A1 displays the charging current value gradually decreasing, the constant current charging ends, and the constant voltage charging stage begins, until the charger under test stops charging; otherwise, the charger under test is faulty.

[0054] Finally, disconnect the input terminal and the output terminal of the charger under test in sequence, turn off the first power switch Ka1, stop the constant voltage power supply UR1, and the test ends.

[0055] This utility model also provides a device for testing the performance of a charger under test, which includes the aforementioned circuit for testing the performance of a charger under test. The charging port of the device is connected to the charger under test. Its specific implementation is as described in the circuit for testing the performance of a charger under test, and will not be repeated here.

[0056] In summary, the performance testing circuit and testing device for a charger under test provided by this utility model have the following beneficial effects:

[0057] This invention uses a combination of a constant voltage power supply and a discharge resistor to simulate the battery charging state. An ammeter and voltmeter are used to detect the charging status of the battery charger at different stages, ensuring that the charging voltage and current values ​​are within the specified range, and that the charger automatically cuts off power when the battery is fully charged. This provides a direct and intuitive way to monitor various parameters of the charger's charging status. It avoids the drawbacks of improper testing, overcharging by abnormal chargers during use, incomplete charging, and high-current charging, thus ensuring charging safety. Furthermore, this invention has a simple structure, is easy to manufacture, has low cost, and is convenient to use, making it suitable for performance testing of electric vehicle chargers in the production, sales, use, and maintenance of electric vehicles.

[0058] It should be understood that the application of this utility model is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A performance testing circuit for a charger under test, characterized in that, include: The module consists of a constant voltage module, a charging control module, and a status detection module; among which, The input terminal of the constant voltage module is connected to the mains power. The constant voltage module is connected to the charging control module. The constant voltage module is used to provide power to the downstream module and output detection voltage to the charging control module. The charging control module is connected to the status detection module and is used to adjust the magnitude of the detection voltage and output the detection voltage to the status control terminal of the status detection module. The status detection module is used to connect to the charger under test, adjust the corresponding charging status of the charger under test through the detection voltage, and collect the operating parameters of the charger under test under the corresponding charging status.

2. The test circuit for the charger under test according to claim 1, characterized in that, The charging control module includes: a first adjustable resistor, a second variable-range resistor, a first voltage detector, a first diode, and a first switch; wherein... One end of the first adjustable resistor is connected to the first power output terminal of the constant voltage module, the other end of the first adjustable resistor is connected to one end of the second variable range resistor, the first output terminal of the second variable range resistor is connected to one end of the first voltage detector, and the second output terminal of the second variable range resistor is connected to the other end of the first voltage detector. The anode of the first diode is connected to one end of the first voltage meter, the cathode of the first diode is connected to one end of the first switch, and the other end of the first switch is connected to the status detection module; the common terminal of the first voltage meter and the second output terminal of the second variable range resistor is connected to the status detection module.

3. The test circuit for the charger under test according to claim 1, characterized in that, The status detection module includes: a third adjustable resistor, a first current meter, a second voltage meter, and an input plug; wherein... One end of the third adjustable resistor is connected to the first end of the first current sensor, and the other end of the third adjustable resistor is connected to one end of the input plug and the charging control module respectively; the second end of the first current sensor is connected to the other end of the input plug. One end of the second voltage meter is connected to the common terminal of the input plug and the third adjustable resistor, and the other end of the second voltage meter is connected to the common terminal of the input plug and the first current meter.

4. The test circuit for the charger under test according to claim 1, characterized in that, It also includes a heat dissipation device; the first end and the second end of the heat dissipation device are respectively connected to the third power input terminal and the third power output terminal of the constant voltage module, and the heat dissipation device is used to dissipate heat from the third adjustable resistor.

5. The test circuit for the charger under test according to claim 3, characterized in that, The first current sensor and the second voltage sensor are digital ammeters and digital voltmeters, respectively, and are independently powered. The first power supply terminal of the first current meter is connected to the second power input terminal of the constant voltage module, and the second power supply terminal of the first current meter is connected to the second power output terminal of the constant voltage module; the first detection terminal of the first current meter is connected to one end of the third adjustable resistor, and the second detection terminal of the first current meter is connected to the other end of the input plug. The first power supply terminal of the second voltage meter is connected to the second power input terminal of the constant voltage module, and the second power supply terminal of the second voltage meter is connected to the second power output terminal of the constant voltage module; the first detection terminal of the second voltage meter is connected to the common terminal of the input plug and the third adjustable resistor, and the second detection terminal of the second voltage meter is connected to the common terminal of the input plug and the first current meter.

6. The test circuit for the charger under test according to claim 5, characterized in that, The first current sensor and the second voltage sensor are DSN-VC288 DC current and voltage meters.

7. The test circuit for the charger under test according to claim 1, characterized in that, The constant voltage module includes a constant voltage power supply, which is connected to the charging control module and the status detection module respectively.

8. A device for testing the performance of a charger under test, characterized in that, The device includes a test circuit for detecting the performance of a charger under test as described in any one of claims 1-7, wherein the charging port of the test device is connected to the charger under test.

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