PoE power supply load test circuit and PoE power supply load test accompanying device
By designing a PoE-powered load test circuit and using a toggle switch to control the power output at different levels, the problems of complexity and high cost of existing equipment are solved, achieving low-cost applicability to various test environments. It supports the IEEE 802.3bt standard and is compatible with the IEEE 802.3at/af standard.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JWIPC TECH CO LTD
- Filing Date
- 2025-04-27
- Publication Date
- 2026-05-19
AI Technical Summary
There is a lack of PoE-powered load testing equipment suitable for the IEEE 802.3bt standard in the current technology. Moreover, the existing equipment has complex circuit design, high cost, and cumbersome operation, and is not suitable for large-scale testing environments.
Design a PoE-powered load test circuit, including a first power conversion circuit, a second power conversion circuit, and a third power conversion circuit. Control the load circuit to output different power levels by a toggle switch. Support the IEEE 802.3bt standard and be backward compatible with the IEEE 802.3at/af standard.
It achieves simple structure and low cost load testing, supports multiple testing environments, is suitable for large-scale testing, reduces testing costs, and facilitates promotion and application.
Smart Images
Figure CN224264975U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of PoE testing technology, and more specifically, to a PoE power supply load testing circuit and a PoE power supply load test device. Background Technology
[0002] With the widespread adoption of the IEEE 802.3bt standard, more and more manufacturers are producing PoE devices that meet this standard. However, there are currently almost no PoE power supply load test devices on the market that support the IEEE 802.3bt standard. Although there are a few such test devices that are expensive, they have obvious problems such as complex circuit design, high development costs, cumbersome operation, lack of durability, and incompatibility with the IEEE 802.3at / af standard. These make them impractical when facing the demand for large-scale switch test in factories, leading to excessively high testing costs and making them unsuitable for large-scale testing environments. This hinders their widespread application and therefore urgently needs improvement. Utility Model Content
[0003] The technical problem to be solved by this utility model is to provide a PoE-powered load test circuit and a PoE-powered load test device, which addresses the above-mentioned deficiencies of the prior art.
[0004] The technical solution adopted by this utility model to solve its technical problem is:
[0005] On one hand, this utility model provides a PoE-powered load test circuit, including a first power conversion circuit, a second power conversion circuit, and a third power conversion circuit; the first power conversion circuit is respectively connected to a first power on / off control circuit and a first load circuit, and the first power on / off control circuit is used to control the first load circuit to output a first or second level of power through a first toggle switch; the second power conversion circuit is respectively connected to a second power on / off control circuit and a second load circuit, and the second power on / off control circuit is used to control the second load circuit to output a third or fourth level of power through a second toggle switch; the third power conversion circuit is respectively connected to a third power on / off control circuit and a third load circuit, and the third power on / off control circuit is used to control the third load circuit to output a fifth or sixth level of power through a third toggle switch.
[0006] In some embodiments, the first power conversion circuit includes a first power chip; the first power on / off control circuit includes a first transistor and a second transistor; the base of the first transistor is connected to a first bidirectional common-anode Schottky diode through a first general-purpose resistor; the collector of the first transistor is connected to a power supply terminal through a second general-purpose resistor, and connected to the base of the second transistor through a third general-purpose resistor; the collector of the second transistor is connected to the enable terminal of the first power chip; the emitters of both the first transistor and the second transistor are grounded.
[0007] In some embodiments, the first load circuit includes a first load resistor and a second load resistor, wherein the first load resistor and the second load resistor are connected in parallel; the first load resistor is also connected in series with a first toggle switch.
[0008] In some embodiments, the second power conversion circuit includes a second power chip; the second power on / off control circuit includes a third transistor and a fourth transistor; the base of the third transistor is connected to a second bidirectional common-anode Schottky diode through a fourth general-purpose resistor; the collector of the third transistor is connected to the power supply terminal through a fifth general-purpose resistor, and connected to the base of the fourth transistor through a sixth general-purpose resistor; the second toggle switch is connected to the collector of the fourth transistor and the enable terminal of the second power chip respectively; the emitters of both the third and fourth transistors are grounded.
[0009] In some embodiments, the second load circuit includes a third load resistor and a fourth load resistor, wherein the third load resistor and the fourth load resistor are connected in parallel.
[0010] In some embodiments, the third power conversion circuit includes a third power chip; the third power on / off control circuit includes a fifth transistor and a sixth transistor; the base of the fifth transistor is connected to a third bidirectional common-anode Schottky diode through a seventh general-purpose resistor; the collector of the fifth transistor is connected to the power supply terminal through an eighth general-purpose resistor, and connected to the base of the sixth transistor through a ninth general-purpose resistor; the third toggle switch is connected to the collector of the sixth transistor and the enable terminal of the third power chip respectively; the emitters of both the fifth and sixth transistors are grounded.
[0011] In some embodiments, the third load circuit includes a fifth load resistor and a sixth load resistor, wherein the fifth load resistor and the sixth load resistor are connected in parallel.
[0012] In some embodiments, the first power conversion circuit, the second power conversion circuit, and the third power conversion circuit are all DC-DC power conversion circuits.
[0013] In some embodiments, among the first gear, second gear, third gear, fourth gear, fifth gear, and sixth gear, the power of the next gear is successively greater than the power of the previous gear.
[0014] On the other hand, this utility model also provides a PoE-powered load testing device, including the PoE-powered load testing circuit as described in any of the above claims.
[0015] The beneficial effects of this utility model are as follows: Unlike existing technologies, the PoE-powered load test circuit of this utility model includes a first power conversion circuit, a second power conversion circuit, and a third power conversion circuit. The first power conversion circuit is connected to a first power on / off control circuit and a first load circuit to output power at a first or second level. The second power conversion circuit is connected to a second power on / off control circuit and a second load circuit to output power at a third or fourth level. The third power conversion circuit is connected to a third power on / off control circuit and a third load circuit to output power at a fifth or sixth level. After PoE input, it can effectively achieve load testing under different PoE power levels while satisfying the device flow path test. The overall structure design is simple, and the development and manufacturing costs are significantly reduced. It supports the IEEE 802.3bt standard and is backward compatible with the IEEE 802.3at / af standard, meeting the needs of various testing environments and facilitating widespread application. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the first power conversion circuit in an embodiment of this utility model;
[0017] Figure 2 This is a schematic diagram of the first power supply on / off control circuit in an embodiment of this utility model;
[0018] Figure 3 This is a schematic diagram of the first load circuit in an embodiment of this utility model;
[0019] Figure 4 This is a schematic diagram of the second power conversion circuit in an embodiment of this utility model;
[0020] Figure 5 This is a schematic diagram of the second power supply on / off control circuit in an embodiment of this utility model;
[0021] Figure 6 This is a schematic diagram of the second load circuit in an embodiment of this utility model;
[0022] Figure 7 This is a schematic diagram of the third power conversion circuit in an embodiment of this utility model;
[0023] Figure 8This is a schematic diagram of the third power supply on / off control circuit in an embodiment of this utility model;
[0024] Figure 9 This is a schematic diagram of the third load circuit in an embodiment of this utility model;
[0025] The diagram is labeled with the following names and numbers: First power conversion circuit - 11; Second power conversion circuit - 21; Third power conversion circuit - 31; First power on / off control circuit - 12; First load circuit - 13; Second power on / off control circuit - 22; Second load circuit - 23; Third power on / off control circuit - 32; Third load circuit - 33. Detailed Implementation
[0026] The terms "first," "second," "third," and "fourth," etc., used in the specification, claims, and accompanying drawings of this utility model are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.
[0027] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the present invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.
[0028] "Multiple" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.
[0029] Furthermore, the terms indicating orientation, such as "up," "down," "front," "back," "left," "right," "upper end," and "lower end," are all based on the posture and position of the device or equipment described in this solution during normal use.
[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, a clear and complete description will be provided below in conjunction with the technical solutions in the embodiments of this utility model. Obviously, the described embodiments are some, but not all, embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0031] Example 1: This utility model embodiment provides a PoE-powered load test circuit, such as Figures 1 to 9 As shown, the PoE-powered load test circuit includes a first power conversion circuit 11, a second power conversion circuit 21, and a third power conversion circuit 31. The first power conversion circuit 11 is connected to a first power on / off control circuit 12 and a first load circuit 13. The first power on / off control circuit 12 is used to control the first load circuit 13 to output a first or second power level through a first toggle switch SW1. The second power conversion circuit 21 is connected to a second power on / off control circuit 22 and a second load circuit 23. The second power on / off control circuit 22 is used to control the second load circuit 23 to output a third or fourth power level through a second toggle switch SW2. The third power conversion circuit 31 is connected to a third power on / off control circuit 32 and a third load circuit 33. The third power on / off control circuit 32 is used to control the third load circuit 33 to output a fifth or sixth power level through a third toggle switch SW3.
[0032] Specifically, in this embodiment, the first power conversion circuit 11 includes a first power chip U2, which enables power supply control. The circuit structure design of the first power chip U2 and its peripheral circuits is as follows: Figure 1 As shown in the diagram. The first power supply on / off control circuit 12 includes a first transistor Q13 and a second transistor Q14; the base of the first transistor Q13 is connected to a first bidirectional common-anode Schottky diode D35 via a first general-purpose resistor R83; the collector of the first transistor Q13 is connected to the power supply terminal via a second general-purpose resistor R81, and to the base of the second transistor Q14 via a third general-purpose resistor R82; the collector of the second transistor Q14 is connected to the enable terminal of the first power chip U2; the emitters of both the first transistor Q13 and the second transistor Q14 are grounded. The specific circuit structure design of the first power supply on / off control circuit 12 is as follows: Figure 2 As shown in the image.
[0033] Furthermore, in this embodiment, the first load circuit 13 includes a first load resistor RD1 and a second load resistor RD2, with the first load resistor RD1 and the second load resistor RD2 connected in parallel; the first load resistor RD1 is also connected in series with the first toggle switch SW1. The specific circuit structure design of the first load circuit 13 is as follows: Figure 3 As shown in the diagram. Specifically, when the first load resistor RD1 and the second load resistor RD2 are connected in parallel, the measured half-load POE power conforms to the af range; while when the first load resistor RD1 is used alone, the measured half-load POE power conforms to the at range, satisfying backward compatibility with the IEEE 802.3at / af standard.
[0034] Specifically, in this embodiment, the second power conversion circuit 21 includes a second power chip U3, which enables power supply control. The circuit structure design of the second power chip U3 and its peripheral circuits is as follows: Figure 4 As shown in the diagram. The second power supply on / off control circuit 22 includes a third transistor Q15 and a fourth transistor Q16; the base of the third transistor Q15 is connected to a second bidirectional common-anode Schottky diode D36 via a fourth general-purpose resistor R88; the collector of the third transistor Q15 is connected to the power supply terminal via a fifth general-purpose resistor R84, and to the base of the fourth transistor Q16 via a sixth general-purpose resistor R87; the second toggle switch SW2 is connected to the collector of the fourth transistor Q16 and the enable terminal of the second power chip U3; the emitters of both the third transistor Q15 and the fourth transistor Q16 are grounded. The specific circuit structure design of the second power supply on / off control circuit 22 is as follows: Figure 5 As shown in the image.
[0035] Furthermore, in this embodiment, the second load circuit 23 includes a third load resistor RD3 and a fourth load resistor RD4, which are connected in parallel. The specific circuit structure design of the second load circuit 23 is as follows: Figure 6 As shown in the image.
[0036] Specifically, in this embodiment, the third power conversion circuit 31 includes a third power chip U4, which enables power supply control. The circuit structure design of the third power chip U4 and its peripheral circuits is as follows: Figure 7As shown in the diagram. The third power supply on / off control circuit 32 includes a fifth transistor Q17 and a sixth transistor Q18; the base of the fifth transistor Q17 is connected to a third bidirectional common-anode Schottky diode D37 via a seventh general-purpose resistor R96; the collector of the fifth transistor Q17 is connected to the power supply terminal via an eighth general-purpose resistor R89, and to the base of the sixth transistor Q18 via a ninth general-purpose resistor R95; the third toggle switch SW3 is connected to the collector of the sixth transistor Q18 and the enable terminal of the third power chip U4; the emitters of both the fifth transistor Q17 and the sixth transistor Q18 are grounded. The specific circuit structure design of the third power supply on / off control circuit 32 is as follows: Figure 8 As shown in the image.
[0037] Furthermore, in this embodiment, the third load circuit 33 includes a fifth load resistor RD5 and a sixth load resistor RD6, which are connected in parallel. The specific circuit structure design of the third load circuit 33 is as follows: Figure 9 As shown in the image.
[0038] In this embodiment, the first load resistor RD1, the second load resistor RD2, the third load resistor RD3, the fourth load resistor RD4, the fifth load resistor RD5, and the sixth load resistor RD6 are all cement resistors. In the corresponding circuit, the more cement resistors in the load, the greater the power.
[0039] In this embodiment, the first power conversion circuit 11, the second power conversion circuit 21, and the third power conversion circuit 31 are all DC-DC power conversion circuits. The first power chip U2, the second power chip U3, and the third power chip U4 are all MP6005 models, used to convert 56V to 12V to supply the corresponding output circuit with a load resistor.
[0040] In this embodiment, among the first, second, third, fourth, fifth, and sixth gears, the power of each subsequent gear is greater than the power of the previous gear, thereby achieving load testing for six gears through three toggle switches.
[0041] The following section, based on the circuit layout of the aforementioned PoE-powered load test circuit, explains its working principle in practical implementation:
[0042] For example, the default first setting is 14W; when the first toggle switch SW1 is closed, the power consumption increases by 14W, so 14 + 14 = 28W, therefore the second setting is 28W. Power consumption is increased and decreased by physically switching on and off; this group is powered by the first power chip U2U2 circuit.
[0043] When the second toggle switch SW2 is closed, the power consumption increases by 31W. When the first toggle switch SW1 is open, the power consumption is 14 + 31 = 45W. When the first toggle switch SW1 is closed, the power consumption is 28 + 31 = 59W. Therefore, the third setting is 45W and the fourth setting is 59W. This group is powered by the second power chip U3 circuit. The second toggle switch SW2 controls the level of the enable pin of the second power chip U3 to turn the output on and off. Turning on the output increases the power consumption, and vice versa.
[0044] When the third toggle switch SW3 is closed, it adds 30W to the current based on the second toggle switch SW2 being closed. When the first toggle switch SW1 is open and the second toggle switch SW2 is closed, the current is 45 + 30 = 75W. When the first toggle switch SW1 is closed and the second toggle switch SW2 is closed, the current is 59 + 30 = 89W. Since the current of the sixth gear is larger and the line loss is increased, the sixth gear is defined as 89 + 1 = 90W. Therefore, the fifth gear is 75W and the sixth gear is 90W.
[0045] In this circuit, the second toggle switch SW2 has a higher priority than the third toggle switch SW3; that is, when the second toggle switch SW2 is open, the third toggle switch SW3 is ineffective. This group is powered by the third power chip U4 circuit. The third toggle switch SW3 turns the output on and off by controlling the level of the enable pin of the third power chip U4; turning the output on increases power consumption, and vice versa. The first toggle switch SW1, the second toggle switch SW2, and the third toggle switch SW3 are each powered by three separate 56VDC to 12VDC circuits of MP6005 to avoid overload.
[0046] The PoE power supply load test circuit of this utility model supports multiple power levels. The power level can be easily switched by controlling the corresponding toggle switch. It is suitable for large-scale testing environments, can be widely applied, and can meet the needs of manufacturers of PoE equipment for auxiliary testing.
[0047] Example 2: This utility model embodiment provides a PoE-powered load testing device, including the PoE-powered load testing circuit provided in Embodiment 1, which meets the applicability of the IEEE 802.3bt standard. The description of the PoE-powered load testing circuit can be found in Embodiment 1 and will not be repeated here.
[0048] In this embodiment, the external interface of the PoE-powered load testing device is two RJ45 network ports, one of which is a PoE and data input port, and the other is a data output port.
[0049] In practical applications, if the PoE-powered load testing device has only front and rear openings, with air entering from the rear and exiting from the front, and the airflow is concentrated, the cooling effect on cement resistors will be better. The front and rear air duct design allows multiple PoE-powered load testing devices to be stacked without heat dissipation risk, making it convenient for stacking during testing in factory areas. The corresponding control switches, indicator lights, and input / output interfaces on the PoE-powered load testing device are all located on the front panel of the device, facilitating networking and viewing the PD status.
[0050] It should be noted that the above description of the PoE-powered load test equipment is merely an example and does not constitute a specific limitation. The PoE-powered load test circuit can be set up in any suitable manner, such as on one or more PCBs, and then one or more PCBs can be placed in any suitable location on the PoE-powered load test equipment. Furthermore, the ventilation and heat dissipation structure design of the PoE-powered load test equipment should be based on achieving optimal heat dissipation and cooling effects.
[0051] It should be understood that 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 PoE-powered load test circuit, characterized in that: The system includes a first power conversion circuit, a second power conversion circuit, and a third power conversion circuit. The first power conversion circuit is connected to a first power on / off control circuit and a first load circuit, respectively. The first power on / off control circuit is used to control the first load circuit to output a first or second power level via a first toggle switch. The second power conversion circuit is connected to a second power on / off control circuit and a second load circuit, respectively. The second power on / off control circuit is used to control the second load circuit to output a third or fourth power level via a second toggle switch. The third power conversion circuit is connected to a third power on / off control circuit and a third load circuit, respectively. The third power on / off control circuit is used to control the third load circuit to output a fifth or sixth power level via a third toggle switch.
2. The PoE-powered load test circuit according to claim 1, characterized in that: The first power conversion circuit includes a first power chip; the first power on / off control circuit includes a first transistor and a second transistor; the base of the first transistor is connected to a first bidirectional common-anode Schottky diode through a first general-purpose resistor; the collector of the first transistor is connected to the power supply terminal through a second general-purpose resistor, and connected to the base of the second transistor through a third general-purpose resistor; the collector of the second transistor is connected to the enable terminal of the first power chip; the emitters of both the first transistor and the second transistor are grounded.
3. The PoE-powered load test circuit according to claim 2, characterized in that: The first load circuit includes a first load resistor and a second load resistor, which are connected in parallel; the first load resistor is also connected in series with a first toggle switch.
4. The PoE-powered load test circuit according to claim 1, characterized in that: The second power conversion circuit includes a second power chip; the second power on / off control circuit includes a third transistor and a fourth transistor; the base of the third transistor is connected to a second bidirectional common-anode Schottky diode through a fourth general-purpose resistor; the collector of the third transistor is connected to the power supply terminal through a fifth general-purpose resistor, and connected to the base of the fourth transistor through a sixth general-purpose resistor; the second toggle switch is connected to the collector of the fourth transistor and the enable terminal of the second power chip respectively; the emitters of both the third and fourth transistors are grounded.
5. The PoE-powered load test circuit according to claim 4, characterized in that: The second load circuit includes a third load resistor and a fourth load resistor, wherein the third load resistor and the fourth load resistor are connected in parallel.
6. The PoE-powered load test circuit according to claim 1, characterized in that: The third power conversion circuit includes a third power chip; the third power on / off control circuit includes a fifth transistor and a sixth transistor; the base of the fifth transistor is connected to a third bidirectional common-anode Schottky diode through a seventh general-purpose resistor; the collector of the fifth transistor is connected to the power supply terminal through an eighth general-purpose resistor, and connected to the base of the sixth transistor through a ninth general-purpose resistor; the third toggle switch is connected to the collector of the sixth transistor and the enable terminal of the third power chip respectively; the emitters of both the fifth and sixth transistors are grounded.
7. The PoE-powered load test circuit according to claim 6, characterized in that: The third load circuit includes a fifth load resistor and a sixth load resistor, which are connected in parallel.
8. The PoE-powered load test circuit according to claim 1, characterized in that: The first power conversion circuit, the second power conversion circuit, and the third power conversion circuit are all DC-DC power conversion circuits.
9. The PoE-powered load test circuit according to any one of claims 1-8, characterized in that: In the first gear, second gear, third gear, fourth gear, fifth gear and sixth gear, the power of each subsequent gear is greater than the power of the previous gear.
10. A PoE-powered load testing device, characterized in that: Includes the PoE-powered load test circuit as described in any one of claims 1-9.