A test circuit and a test method thereof

Abstract

The present invention provides a test circuit for fast charging test of power products output by multiple USB ports, including a power module, a port function control circuit and at least one USB test unit, each USB test unit including a USB test port, a fast charging protocol circuit, a voltage and current detection circuit, a product configuration circuit and a load setting circuit; a test method using the test circuit is also provided, the USB test port of the product to be tested is connected to the USB test port of the test circuit in a one-to-one correspondence through a USB connection line, the port function control circuit configures the fast charging protocol circuit, the voltage and current detection circuit and the load setting circuit of the USB test unit corresponding to the USB test port to be tested, and the product configuration circuit of one of the remaining USB test units sets the internal parameters of the product to be tested according to product specifications and test requirements, and quickly realizes the fast charging test of the USB test port to be tested. The present invention shortens the test time, improves the production speed of the product, and reduces the cost.

Description

Technical Field

[0001] The present invention belongs to the technical field of fast charging of power products, and in particular to a test circuit and a test method for fast charging test of a power product with multiple USB ports output. Background Art

[0002] In order to meet people's diverse needs for power products, many power products with multiple USB port outputs are currently circulating on the market, and such power products need to implement fast charging mode. In order to ensure that each USB port of each power product circulating on the market supports its nominal fast charging output specification, it is necessary to perform necessary tests on each USB port according to its product specification definition during the production and testing phase of the power product to screen out products that cannot output fast charging normally or do not meet its specification requirements.

[0003] For the fast charging test of power products with multiple USB ports during the production test phase, the conventional test method is to use a USB cable to connect the USB port of the test device and the USB port of the product to be tested. After the test of one USB port of the product to be tested is completed, the cable is switched to another USB port of the product to be tested and the test is continued until all USB ports are tested. This method takes a long time to test, and the product production speed is slow and the cost is high. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a test circuit and a test method for fast charging test of a power supply product with multiple USB ports output. The USB test port of the product to be tested is connected to the USB test port of the test circuit one by one through a USB connecting line. The port function control circuit configures the fast charging protocol circuit, voltage and current detection circuit and load setting circuit of the USB test unit corresponding to the USB test port to be tested. The product to be tested configuration circuit of one of the remaining USB test units sets the internal parameters of the product to be tested according to product specifications and test requirements, and cooperates with each other to quickly realize the fast charging test of the USB test port to be tested. The present invention shortens the test time, improves the production speed of the product, and reduces the cost.

[0005] The present invention provides a test circuit for fast charging test of a power product with multiple USB ports output, comprising a power module, a port function control circuit and at least one USB test unit, each of which comprises a USB test port, a fast charging protocol circuit, a voltage and current detection circuit, a configuration circuit for a product to be tested and a load setting circuit;

[0006] One end of the USB test port is connected to the USB test port corresponding to the product to be tested through a USB connection line, and the other end is electrically connected to the fast charging protocol circuit, the product to be tested configuration circuit and the load setting circuit in the USB test unit to which it belongs;

[0007] The fast charging protocol circuit is used to apply for fast charging output to the USB test port of the product to be tested, and set different fast charging protocol deceptions according to the output specifications of each USB test port of the product to be tested;

[0008] The voltage and current detection circuit is used to detect the voltage and current values ​​of the USB test port and determine whether the voltage and current values ​​meet the requirements. The voltage and current detection circuit is electrically connected to the load setting circuit;

[0009] The product under test configuration circuit is used to configure the internal parameters of the product under test according to product specifications and test requirements;

[0010] The load setting circuit is used to add a load test to the USB test port, and the load setting circuit configures a corresponding load according to the output power specification of each USB port to be tested;

[0011] The port function control circuit is electrically connected to the fast charging protocol circuit, voltage and current detection circuit, product configuration circuit and load setting circuit in each of the USB test units, and is used to configure the working state of the fast charging protocol circuit, voltage and current detection circuit, product configuration circuit and load setting circuit in each USB test unit according to the specifications of each USB test port of the product to be tested; the power supply module is used to provide power and is electrically connected to the port function control circuit.

[0012] Furthermore, the load setting circuit includes a load setting controller, a first comparator COMP1, a MOS tube and a first resistor R1, the positive input end of the first comparator COMP1 is connected to the load setting controller, the negative input end is connected to the first end of the first resistor R1, the output end of the first comparator COMP1 is electrically connected to the MOS tube, the MOS tube is electrically connected to the load setting controller and the first end of the first resistor R1, respectively, and the second end of the first resistor R1 is electrically connected to the voltage and current detection circuit and grounded at the same time.

[0013] Further, the voltage and current detection circuit includes a voltage and current detection controller, a current sensor A1, a second resistor R2, a third resistor R3, a second comparator COMP2 and a third comparator COMP3, the two input ends of the current sensor A1 are respectively electrically connected to the two ends of the first resistor R1, the output end of the current sensor A1 is connected to the positive input end of the second comparator COMP2, the negative input end and the output end of the second comparator COMP2 are respectively electrically connected to the voltage and current detection controller, the first end of the second resistor R2 is electrically connected to the MOS tube in the load setting circuit, and the second end is electrically connected to the first end of the third resistor R3, the second end of the third resistor R3 is grounded, the common end of the second resistor R2 and the third resistor R3 is also electrically connected to the negative input end of the third comparator COMP3, and the positive input end and the output end of the third comparator COMP3 are respectively electrically connected to the voltage and current detection controller.

[0014] Furthermore, the fast charging protocol circuit includes at least one fast charging sub-module, the fast charging sub-modules are connected in series in sequence and are respectively electrically connected to the USB test ports of the USB test unit, and the port function control circuit is respectively connected to each of the fast charging sub-modules.

[0015] Furthermore, the configuration circuit of the product to be tested includes an IIC module and a data module, one end of the IIC module is connected to the USB port to be tested, and the other end is connected to the data module, and the data module is electrically connected to the port function control circuit.

[0016] Furthermore, the port function control circuit is electrically connected to the load setting controller and the voltage and current detection controller respectively.

[0017] Furthermore, each of the USB test units also includes a first switch S1 and a second switch S2, the first switch S1 is arranged between the fast charging protocol circuit and the USB test port, and is electrically connected to the port function control circuit at the same time, and the second switch S2 is arranged between the configuration circuit of the product to be tested and the USB test port, and is electrically connected to the port function control circuit at the same time.

[0018] The present invention also provides a test method with the test circuit, which is used for fast charging output test of a product to be tested whose multiple USB test ports cannot independently fast charge output each other, wherein the USB test unit includes a USB test unit 1, a USB test unit 2, ..., a USB test unit N, and the method includes:

[0019] Step S1, after the power is turned on, the USB test port of the product to be tested is connected to the USB test port of the test circuit in a one-to-one correspondence through a USB connection line;

[0020] Step S2, the port function control circuit configures the fast charging protocol circuit, the voltage and current detection circuit and the load setting circuit of the USB test unit 1 according to the specifications of the corresponding USB test port 1 of the product to be tested;

[0021] Step S3, the port function control circuit configures the product configuration circuit of the USB test unit 2 to be in working state, and the product configuration circuit of the USB test unit 2 sets the internal parameters of the product according to the product specifications and test requirements;

[0022] Step S4, the fast charging protocol circuit of the USB test unit 1 sets the corresponding fast charging protocol deception and applies for fast charging output in combination with the fast charging output protocol supported by the USB test port 1 of the product to be tested and the test requirements;

[0023] Step S5, after completing the fast charging test of the USB test unit 1, the port function control circuit configures the fast charging protocol circuit, the voltage and current detection circuit and the load setting circuit of the USB test unit 2 according to the specifications of the corresponding USB test port 2 of the product to be tested;

[0024] Step S6, the port function control circuit configures the product configuration circuit of the USB test unit 3 to be in working state, and the product configuration circuit of the USB test unit 3 sets the internal parameters of the product according to the product specifications and test requirements;

[0025] Step S7, the fast charging protocol circuit of the USB test unit 2 sets the corresponding fast charging protocol deception and applies for fast charging output in combination with the fast charging output protocol supported by the USB test port 2 of the product to be tested and the test requirements;

[0026] Step S8, completing the fast charging test of USB test unit 2, and so on in sequence until the fast charging test of all USB test units is completed.

[0027] Furthermore, in step S4, the voltage and current detection circuits of the other USB test units except the USB test unit 1 and the USB test unit 2 detect the voltage value and the current value of the corresponding USB test port at this time.

[0028] Furthermore, in step S7, the voltage and current detection circuits of the other USB test units except the USB test unit 2 and the USB test unit 3 detect the voltage value and the current value of the corresponding USB test port at this time.

[0029] Beneficial effects of the present invention:

[0030] The present invention provides a test circuit for fast charging test of a power product with multiple USB ports output, comprising a power module, a port function control circuit and at least one USB test unit, each of the USB test units comprising a USB test port, a fast charging protocol circuit, a voltage and current detection circuit, a product configuration circuit to be tested and a load setting circuit; a test method using the test circuit is also provided, wherein a USB test port of the product to be tested is connected to a USB test port of the test circuit in a one-to-one correspondence via a USB connection line, the port function control circuit configures the fast charging protocol circuit, the voltage and current detection circuit and the load setting circuit of the USB test unit corresponding to the USB test port to be tested, the product configuration circuit to be tested of one of the remaining USB test units sets internal parameters of the product to be tested according to product specifications and test requirements, and cooperates with each other to quickly implement the fast charging test of the USB test port to be tested; the present invention shortens the test time, improves the production speed of the product and reduces the cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The present invention is further described using the accompanying drawings, but the embodiments in the accompanying drawings do not constitute any limitation to the present invention. A person skilled in the art can obtain other drawings based on the following drawings without creative work.

[0032] Figure 1 The invention provides a circuit principle block diagram of a test circuit.

[0033] Figure 2 The present invention provides a circuit schematic diagram of a USB test unit of a test circuit. DETAILED DESCRIPTION

[0034] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0036] Embodiment 1:

[0037] Reference Figure 1 to Figure 2 The present embodiment provides a test circuit for fast charging test of a power product with multiple USB ports output, including a power module, a port function control circuit and at least one USB test unit, namely USB test unit 1, USB test unit 2...USB test unit N, each of the USB test units includes a USB test port, a fast charging protocol circuit, a voltage and current detection circuit, a product configuration circuit to be tested and a load setting circuit.

[0038] One end of the USB test port is connected to the USB test port corresponding to the product to be tested through a USB connecting line, and the other end is electrically connected to the fast charging protocol circuit, the product to be tested configuration circuit and the load setting circuit in the USB test unit to which it belongs.

[0039] The fast charging protocol circuit is used to apply for fast charging output to the USB test port of the product to be tested, and set different fast charging protocol deceptions according to the output specifications of each USB test port of the product to be tested. The fast charging protocol circuit includes at least one fast charging sub-module, which are sequentially connected in series and electrically connected to the USB test ports of the USB test unit respectively, and the port function control circuit is respectively connected to each of the fast charging sub-modules.

[0040] The voltage and current detection circuit is used to detect the voltage and current values ​​of the USB test port and determine whether the voltage and current values ​​meet the requirements. The voltage and current detection circuit is electrically connected to the load setting circuit. The voltage and current detection circuit includes a voltage and current detection controller, a current sensor A1, a second resistor R2, a third resistor R3, a second comparator COMP2 and a third comparator COMP3. The two input ends of the current sensor A1 are electrically connected to the two ends of the first resistor R1 respectively, and the output end of the current sensor A1 is connected to the positive input end of the second comparator COMP2. The negative input end and the output end of the second comparator COMP2 are electrically connected to the voltage and current detection controller respectively. The first end of the second resistor R2 is electrically connected to the MOS tube in the load setting circuit, and the second end is electrically connected to the first end of the third resistor R3. The second end of the third resistor R3 is grounded, and the common end of the second resistor R2 and the third resistor R3 is also electrically connected to the negative input end of the third comparator COMP3. The positive input end and the output end of the third comparator COMP3 are electrically connected to the voltage and current detection controller respectively.

[0041] The product configuration circuit to be tested configures the internal parameters of the product to be tested according to the specifications and test requirements of the product to be tested. The product to be tested and the fast charging protocol circuit in this test circuit cooperate with each other to reduce the test time. The product configuration circuit to be tested includes an IIC module and a data module. One end of the IIC module is connected to the USB port to be tested and the other end is connected to the data module. The data module is electrically connected to the port function control circuit.

[0042] The load setting circuit is used for adding load test to the USB test port, and the load setting circuit configures the corresponding load according to the output power specification of each USB port to be tested. The load setting circuit includes a load setting controller, a first comparator COMP1, a MOS tube and a first resistor R1, the positive input end of the first comparator COMP1 is connected to the load setting controller, and the negative input end is connected to the first end of the first resistor R1, the output end of the first comparator COMP1 is electrically connected to the MOS tube, the MOS tube is electrically connected to the load setting controller and the first end of the first resistor R1 respectively, and the second end of the first resistor R1 is electrically connected to the voltage and current detection circuit and grounded at the same time.

[0043] The port function control circuit is electrically connected to the fast charging protocol circuit, voltage and current detection circuit, product configuration circuit and load setting circuit in each of the USB test units, and is used to configure the working state of the fast charging protocol circuit, voltage and current detection circuit, product configuration circuit and load setting circuit in each USB test unit according to the specifications of each USB port to be tested of the product to be tested. The port function control circuit is electrically connected to the load setting controller and the voltage and current detection controller, respectively; the power supply module is used to provide power and is electrically connected to the port function control circuit.

[0044] Each of the USB test units also includes a first switch S1 and a second switch S2. The first switch S1 is arranged between the fast charging protocol circuit and the USB test port, and is electrically connected to the port function control circuit at the same time. The second switch S2 is arranged between the configuration circuit of the product to be tested and the USB test port, and is electrically connected to the port function control circuit at the same time. The port function control circuit realizes the working state of the fast charging protocol circuit and the configuration circuit of the product to be tested in each USB test unit by controlling the on and off of the first switch S1 and the second switch S2.

[0045] Embodiment 2:

[0046] This embodiment provides a test method with the test circuit, which is used for fast charging output test of a product under test whose multiple USB test ports cannot independently fast charge output each other, wherein the USB test unit includes USB test unit 1, USB test unit 2, ..., USB test unit N, and the corresponding product under test includes USB test port 1, USB test port 2, ..., USB test port N, and the method includes:

[0047] Step S1, after the power is turned on, the USB test port of the product to be tested is connected to the USB test port of the test circuit in a one-to-one correspondence through a USB connection line;

[0048] Step S2, the port function control circuit configures the fast charging protocol circuit, the voltage and current detection circuit and the load setting circuit of the USB test unit 1 according to the specifications of the corresponding USB test port 1 of the product to be tested;

[0049] Step S3, the port function control circuit configures the product configuration circuit of the USB test unit 2 to be in working state, and the product configuration circuit of the USB test unit 2 sets the internal parameters of the product according to the product specifications and test requirements;

[0050] Step S4, the fast charging protocol circuit of the USB test unit 1 sets the corresponding fast charging protocol deception and applies for fast charging output in combination with the fast charging output protocol supported by the USB test port 1 of the product to be tested and the test requirements;

[0051] Step S5, after completing the fast charging test of the USB test unit 1, the port function control circuit configures the fast charging protocol circuit, the voltage and current detection circuit and the load setting circuit of the USB test unit 2 according to the specifications of the corresponding USB test port 2 of the product to be tested;

[0052] Step S6, the port function control circuit configures the product configuration circuit of the USB test unit 3 to be in working state, and the product configuration circuit of the USB test unit 3 sets the internal parameters of the product according to the product specifications and test requirements;

[0053] Step S7, the fast charging protocol circuit of the USB test unit 2 sets the corresponding fast charging protocol deception and applies for fast charging output in combination with the fast charging output protocol supported by the USB test port 2 of the product to be tested and the test requirements;

[0054] Step S8, completing the fast charging test of USB test unit 2, and so on in sequence until the fast charging test of all USB test units is completed.

[0055] It should be noted that the test circuit automatically tests the USB test ports of the product to be tested one by one. When testing USB test port 1, the port function control circuit configures the fast charging protocol circuit, voltage and current detection circuit and load setting circuit of USB test unit 1 according to the specifications of USB test port 1, and the port function control circuit also controls the product to be tested configuration circuit of USB test unit 2, and configures the product to be tested configuration circuit of USB test unit 2 to be in a working state. At this time, the product to be tested configuration circuit of USB test unit 2 sets the internal parameters of the product to be tested according to the specifications of the product to be tested and the test requirements, so as to quickly respond to the fast charging request of USB test unit 1, so when the fast charging protocol circuit of USB test unit 1 applies for fast charging output to USB test port 1 of the product to be tested, the response time can be shortened; after completing the fast charging test of USB test unit 1, continue to test downward according to this method until the fast charging test of all USB test units is completed; in addition, when the last USB test port N is tested, the product to be tested configuration circuit of USB test unit 1 is in a working state, and sets the internal parameters of the product to be tested according to the product specifications and test requirements to complete a complete cycle.

[0056] Furthermore, in step S4, the voltage and current detection circuits of the other USB test units except USB test unit 1 and USB test unit 2 detect the voltage and current values ​​of the corresponding USB test port at this time. In step S7, the voltage and current detection circuits of the other USB test units except USB test unit 2 and USB test unit 3 detect the voltage and current values ​​of the corresponding USB test port at this time.

[0057] Compared with the prior art, the present invention provides a test circuit for fast charging test of a power product with multiple USB ports output, comprising a power module, a port function control circuit and at least one USB test unit, each of the USB test units comprising a USB test port, a fast charging protocol circuit, a voltage and current detection circuit, a product configuration circuit to be tested and a load setting circuit; a test method using the test circuit is also provided, wherein the USB test port of the product to be tested is connected to the USB test port of the test circuit in a one-to-one correspondence via a USB connection line, the port function control circuit configures the fast charging protocol circuit, the voltage and current detection circuit and the load setting circuit of the USB test unit corresponding to the USB test port to be tested, the product configuration circuit to be tested of one of the remaining USB test units sets the internal parameters of the product to be tested according to product specifications and test requirements, and cooperates with each other to quickly implement the fast charging test of the USB test port to be tested; the present invention shortens the test time, improves the production speed of the product and reduces the cost.

[0058] Finally, it should be emphasized that the present invention is not limited to the above-mentioned implementation mode. The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A test circuit for fast charging test of a power supply product with multiple USB ports, characterized in that: It includes a power module, a port function control circuit and at least one USB test unit, each of which includes a USB test port, a fast charging protocol circuit, a voltage and current detection circuit, a product configuration circuit to be tested and a load setting circuit; One end of the USB test port is connected to the USB test port corresponding to the product to be tested through a USB connection line, and the other end is electrically connected to the fast charging protocol circuit, the product to be tested configuration circuit and the load setting circuit in the USB test unit to which it belongs; The fast charging protocol circuit is used to apply for fast charging output to the USB test port of the product to be tested, and set different fast charging protocol deceptions according to the output specifications of each USB test port of the product to be tested; The voltage and current detection circuit is used to detect the voltage and current values ​​of the USB test port and determine whether the voltage and current values ​​meet the requirements. The voltage and current detection circuit is electrically connected to the load setting circuit; The product under test configuration circuit is used to configure the internal parameters of the product under test according to product specifications and test requirements; The load setting circuit is used to add a load test to the USB test port, and the load setting circuit configures a corresponding load according to the output power specification of each USB port to be tested; The port function control circuit is electrically connected to the fast charging protocol circuit, voltage and current detection circuit, product configuration circuit and load setting circuit in each of the USB test units, and is used to configure the working state of the fast charging protocol circuit, voltage and current detection circuit, product configuration circuit and load setting circuit in each USB test unit according to the specifications of each USB test port of the product to be tested; the power supply module is used to provide power and is electrically connected to the port function control circuit.

2. A test circuit as claimed in claim 1, characterized in that: The load setting circuit includes a load setting controller, a first comparator COMP1, a MOS tube and a first resistor R1, wherein the positive input end of the first comparator COMP1 is connected to the load setting controller, and the negative input end is connected to the first end of the first resistor R1, the output end of the first comparator COMP1 is electrically connected to the MOS tube, and the MOS tube is electrically connected to the load setting controller and the first end of the first resistor R1 respectively, and the second end of the first resistor R1 is electrically connected to the voltage and current detection circuit and grounded at the same time.

3. A test circuit as claimed in claim 2, characterized in that: The voltage and current detection circuit includes a voltage and current detection controller, a current sensor A1, a second resistor R2, a third resistor R3, a second comparator COMP2 and a third comparator COMP3. The two input ends of the current sensor A1 are respectively electrically connected to the two ends of the first resistor R1, the output end of the current sensor A1 is connected to the positive input end of the second comparator COMP2, the negative input end and the output end of the second comparator COMP2 are respectively electrically connected to the voltage and current detection controller, the first end of the second resistor R2 is electrically connected to the MOS tube in the load setting circuit, and the second end is electrically connected to the first end of the third resistor R3, the second end of the third resistor R3 is grounded, the common end of the second resistor R2 and the third resistor R3 is also electrically connected to the negative input end of the third comparator COMP3, and the positive input end and the output end of the third comparator COMP3 are respectively electrically connected to the voltage and current detection controller.

4. A test circuit as claimed in claim 3, characterized in that: The fast charging protocol circuit includes at least one fast charging sub-module, which are connected in series in sequence and are respectively electrically connected to the USB test ports of the USB test unit, and the port function control circuit is respectively connected to each of the fast charging sub-modules.

5. A test circuit as claimed in claim 4, characterized in that: The configuration circuit of the product to be tested includes an IIC module and a data module. One end of the IIC module is connected to the USB port to be tested, and the other end is connected to the data module. The data module is electrically connected to the port function control circuit.

6. A test circuit as claimed in claim 5, characterized in that: The port function control circuit is electrically connected to the load setting controller and the voltage and current detection controller respectively.

7. A test circuit as claimed in claim 5, characterized in that: Each of the USB test units also includes a first switch S1 and a second switch S2. The first switch S1 is arranged between the fast charging protocol circuit and the USB test port, and is electrically connected to the port function control circuit at the same time. The second switch S2 is arranged between the configuration circuit of the product to be tested and the USB test port, and is electrically connected to the port function control circuit at the same time.

8. A test method for the test circuit according to any one of claims 1 to 7, used for fast charging output testing of a product under test whose multiple USB test ports cannot independently fast charge output, characterized in that: The USB test unit includes USB test unit 1, USB test unit 2, ..., USB test unit N, and the method includes: Step S1, after the power is turned on, the USB test port of the product to be tested is connected to the USB test port of the test circuit in a one-to-one correspondence through a USB connection line; Step S2, the port function control circuit configures the fast charging protocol circuit, the voltage and current detection circuit and the load setting circuit of the USB test unit 1 according to the specifications of the corresponding USB test port 1 of the product to be tested; Step S3, the port function control circuit configures the product configuration circuit of the USB test unit 2 to be in working state, and the product configuration circuit of the USB test unit 2 sets the internal parameters of the product according to the product specifications and test requirements; Step S4, the fast charging protocol circuit of the USB test unit 1 sets the corresponding fast charging protocol deception and applies for fast charging output in combination with the fast charging output protocol supported by the USB test port 1 of the product to be tested and the test requirements; Step S5, after completing the fast charging test of the USB test unit 1, the port function control circuit configures the fast charging protocol circuit, the voltage and current detection circuit and the load setting circuit of the USB test unit 2 according to the specifications of the corresponding USB test port 2 of the product to be tested; Step S6, the port function control circuit configures the product configuration circuit of the USB test unit 3 to be in working state, and the product configuration circuit of the USB test unit 3 sets the internal parameters of the product according to the product specifications and test requirements; Step S7, the fast charging protocol circuit of the USB test unit 2 sets the corresponding fast charging protocol deception and applies for fast charging output in combination with the fast charging output protocol supported by the USB test port 2 of the product to be tested and the test requirements; Step S8, completing the fast charging test of USB test unit 2, and so on in sequence until the fast charging test of all USB test units is completed.

9. A testing method as claimed in claim 8, characterized in that: In step S4 , the voltage and current detection circuits of the other USB test units except the USB test unit 1 and the USB test unit 2 detect the voltage and current values ​​of the corresponding USB test ports at this time.

10. A testing method as claimed in claim 8, characterized in that: In step S7 , the voltage and current detection circuits of the other USB test units except the USB test unit 2 and the USB test unit 3 detect the voltage and current values ​​of the corresponding USB test ports at this time.

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