Power supply ripple test stress ring

Abstract

The utility model relates to a power supply ripple test stress ring which comprises a ripple cap module, a positive and negative electrode line module and an oscilloscope probe. The ripple cap module comprises a first ripple cap connected with the positive electrode and a second ripple cap connected with the negative electrode; the positive and negative wire module comprises a positive wire and a negative wire, one end of the positive wire is electrically connected with the first ripple cap, one end of the negative wire is electrically connected with the second ripple cap, and the other ends of the positive wire and the negative wire are jointly connected with a power supply to be tested; one end of the oscilloscope probe is provided with a positive electrode probe and a negative electrode probe, the positive electrode probe of the oscilloscope is inserted into the inner surface of the first ripple cap in a plugging manner and is in electric contact with the first ripple cap, the negative electrode probe of the oscilloscope is inserted into the inner surface of the second ripple cap in a plugging manner and is in electric contact with the second ripple cap, and the other end of the oscilloscope probe is connected to the oscilloscope; the ripple cap module, the positive and negative electrode line module, the oscilloscope probe and the power supply to be tested form a closed loop. The system has the advantages of being accurate in retrieval, efficient in operation, low in cost and good in applicability.

Description

TECHNICAL FIELD

[0001] The utility model relates to power supply ripple detection technical field especially is related to a power supply ripple test stress ring. BACKGROUND

[0002] In the design and test field of switching power supply, the most intuitive presentation form of power supply performance is power supply ripple, which specifically refers to the fluctuation phenomenon of power supply output voltage. During the operation of the switching power supply, the internal switching signal will cause a specific sound. In fact, the output fluctuation of the power supply is composed of two key parts, namely ripple and noise.

[0003] From the principle of ripple generation, the pulsating current will form a corresponding voltage drop on the ESR (equivalent series resistance) of the capacitor when flowing through the output capacitor. Based on this physical property, it is impossible to completely eliminate the ripple, and we can only reduce its amplitude as much as possible through various technical means. Unlike the noise superimposed on the ripple, there is room for improvement through reasonable circuit design and optimization measures.

[0004] In the current industry practice, the oscilloscope is a common tool for detecting power supply ripple. For example, in Chinese patent No. CN218938461U, a power supply ripple testing device is disclosed, which includes a shell and a shell cover arranged at the top of the shell. A probe is arranged inside the shell. A test assembly is also arranged inside the shell. The test assembly includes a ground ring and a positive ring. The top of the ground ring and the positive ring is provided with a support rod. The support rod extends to the outside of the shell cover and is provided with a sliding block. The sliding block is provided with a positioning block on both sides. The positioning block is provided with a fastening bolt at the top. In actual use, the fastening bolt is loosened, and then the sliding block is pulled to move along the second sliding groove. The ground ring or the positive ring can be moved by the support rod, and the distance between the ground ring and the positive ring can be adjusted. The operation is convenient and efficient, and the work efficiency is effectively improved.

[0005] The existing technical solutions in the above have many defects: on the one hand, the measurement accuracy is not high, the complex structure leads to a long signal transmission path, and the parasitic inductance and electromagnetic interference are not optimized, which easily introduces interference and affects the measurement accuracy; on the other hand, the detection efficiency is low, and when facing a large number of switching power supply test tasks, a lot of time will be consumed, which seriously affects the test progress and work efficiency; at the same time, the applicability of the existing oscilloscope is limited, the structure layout of the integrated closed device is fixed, it is difficult to be compatible with the existing equipment, and the applicability is limited; moreover, the structure is complex and the cost is high, a large number of parts are included, and the precision machining and assembly cost is too high. UTILITY MODEL CONTENTS

[0006] In view of the shortcomings of the existing technology, the purpose of this utility model is to provide a power supply ripple test stress ring, which has the advantages of accurate detection, efficient operation, low cost, and good applicability.

[0007] The above-mentioned utility model objective is achieved through the following technical solution:

[0008] A power supply ripple test stress ring includes a ripple cap module, a positive and negative wire module, and an oscilloscope probe;

[0009] The ripple cap module includes a first ripple cap for connecting to the positive terminal and a second ripple cap for connecting to the negative terminal.

[0010] The positive and negative wire module includes a positive wire and a negative wire. One end of the positive wire is electrically connected to the first ripple cap, and one end of the negative wire is electrically connected to the second ripple cap. The other ends of the positive wire and the other ends of the negative wire are connected to the same test point of the power supply under test.

[0011] One end of the oscilloscope probe is provided with a positive probe and a negative probe. The positive probe of the oscilloscope probe is inserted into the first ripple cap in a plug-in manner and makes electrical contact with the inner surface of the first ripple cap. The negative probe of the oscilloscope probe is inserted into the second ripple cap in a plug-in manner and makes electrical contact with the inner surface of the second ripple cap. The other end of the oscilloscope probe is connected to the oscilloscope.

[0012] The ripple cap module, the positive and negative wire module, the oscilloscope probe, and the power supply under test form a closed loop.

[0013] The above technical solution constructs a ripple cap module, positive and negative electrode module, and oscilloscope probe ripple test circuit system, ensuring the shortest measurement path and the least amount of noise introduced, thus maximizing the accuracy of ripple measurement. The circuit design minimizes the measurement path, reducing signal interference and loss, and improving the accuracy of ripple measurement.

[0014] As a further technical solution of this utility model: the first ripple cap is made of copper wire tightly wound on the positive electrode of the oscilloscope probe, and the second ripple cap is made of copper wire tightly wound on the negative electrode of the oscilloscope probe. Both the first ripple cap and the second ripple cap are in close contact with the metal surface of the oscilloscope probe.

[0015] Through the above technical solution, the tightly wound copper wires are in close contact with the metal surface of the oscilloscope probes, which reduces the contact resistance and improves the stability and accuracy of signal transmission. The tight contact method can effectively reduce interference and loss during signal transmission, enabling the oscilloscope to measure power supply ripple more accurately.

[0016] As a further technical scheme of the utility model: the positive pole line and the negative pole line are mutually wound through the way of close adhesion and parallel, form the double -twisted pair structure.

[0017] Through the above technical scheme, the winding mode of the positive pole line and the negative pole line effectively reduces electromagnetic interference, improves the quality of signal transmission, so that the power supply ripple measured by the oscilloscope is more accurate and reliable.

[0018] As a further technical scheme of the utility model: still include circuit board, one side of circuit board is connected through the wire ripple cap module, the other side is connected through the wire positive and negative pole line module.

[0019] Through the above technical scheme, the circuit board provides the stability of physical support and electrical connection, makes the structure of whole test stress ring more compact, stable, is convenient for installation and maintenance.

[0020] Summarized above, the utility model includes following at least one beneficial technical effect:

[0021] 1. The utility model discloses a power supply ripple test stress ring, which is directly connected in series with an oscilloscope probe through a ripple cap module and a positive and negative pole line module, realizes extremely simplified design of a test loop path, and significantly shortens the loop length of traditional ripple testing.

[0022] 2. The utility model discloses a power supply ripple test stress ring, which is directly contacted with the inner surface of a probe through a copper wire tightly wound ripple cap, realizes stable electrical connection with low impedance, and effectively improves the transmission quality of high-frequency ripple signals.

[0023] 3. The utility model discloses a power supply ripple test stress ring, which is connected in series with an oscilloscope probe through a copper wire tightly wound ripple cap, realizes stable electrical connection with low impedance, and effectively improves the transmission quality of high-frequency ripple signals. DRAWINGS

[0024] Figure 1 It is the front view of the utility model embodiment one.

[0025] Figure 2 It is the front view of the ripple cap module and the positive and negative pole line module in the utility model embodiment one.

[0026] Fig. 1, ripple cap module; 11, first ripple cap; 12, second ripple cap; 2, positive and negative pole line module; 21, positive pole line; 22, negative pole line; 3, oscilloscope probe; 4, circuit board. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application; obviously, the described embodiments are only part of the embodiments of the present application, and not all the embodiments of the present application; based on the embodiments in the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work belong to the protection scope of the present application.

[0028] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom end" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "provided with", "sleeved / connected", "connected" and the like should be broadly understood, for example, "connected" can be fixedly connected, can be detachably connected, or integrally connected; can be mechanically connected, can be electrically connected; can be directly connected, can be indirectly connected through an intermediate medium, and can be internal communication of two elements. For a person of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0030] Embodiment one:

[0031] Referring to Figure 1 The utility model discloses a power supply ripple test stress ring, including ripple cap module 1, positive and negative pole line module 2 and oscilloscope probe 3.

[0032] Ripple cap module 1 includes the first ripple cap 11 for connecting the positive pole and the second ripple cap 12 for connecting the negative pole, and the first ripple cap 11 is closely wound on the positive pole of the oscilloscope probe 3 and is constituted by the copper wire with high purity, and the second ripple cap 12 is constituted by the copper wire closely wound on the negative pole of the oscilloscope probe 3.

[0033] Among them, the copper wire can select the oxygen-free copper with high purity to ensure good conductivity, and the diameter of the copper wire is selected to be 0.1-0.3mm, and in the winding process of the copper wire, the copper wire is closely attached to the probe surface of the oscilloscope probe 3, avoiding poor contact.

[0034] After winding, the end of the first ripple cap 11 is directly welded to one end of the positive line 21 in the positive and negative line module 2, and the end of the second ripple cap 12 is also directly welded to one end of the negative line 22 in the positive and negative line module 2, to ensure the stability and conductivity of the connection.

[0035] In addition, in order to realize the close contact of the ripple cap module 1 with the metal surface of the oscilloscope probe 3, silver plating with a thickness ≥2μm can also be performed on the inner surface of the copper wire of the ripple cap module 1, further reducing the resistance conductivity of the ripple cap module 1, inhibiting the contact degradation caused by oxidation, and improving the conductivity and corrosion resistance.

[0036] The positive and negative line module 2 includes the positive line 21 and the negative line 22, which are closely attached and wound in parallel to form a twisted pair. The material of the positive line 21 and the negative line 22 is selected to be a low-resistance conductor to improve conductivity and flexibility and improve signal transmission efficiency. The length of the positive line 21 and the negative line 22 should be reasonably designed according to actual testing requirements to avoid signal attenuation or introduction of too much interference caused by excessive length. In order to reduce electromagnetic interference, the positive line 21 and the negative line 22 are closely attached and wound in parallel at a specific pitch to form a twisted pair structure. The winding pitch needs to be optimized according to the actual application scenario, and a smaller pitch can better suppress electromagnetic interference. This is because a small pitch can more effectively cancel out the reverse magnetic field generated by adjacent turns of wire, and reduce the change in magnetic flux enclosed by the loop, thereby reducing the inductance value of the loop. This weakens the magnetic field strength generated by high-frequency current in the loop, thereby reducing the magnetic field coupling between other circuits or devices, effectively suppressing high-frequency noise coupling interference with a frequency greater than 1MHz. For example, winding every 5mm can significantly suppress the influence of external electromagnetic interference on signal transmission.

[0037] One end of the positive line 21 is welded to the first ripple cap 11, and one end of the negative line 22 is welded to the second ripple cap 12. The other end of the positive line 21 and the other end of the negative line 22 are connected to the same test point of the power supply to be tested.

[0038] In addition, in order to further suppress external common-mode noise, a metal shielding layer such as aluminum foil is tightly wrapped around the insulating outer layer of the positive line 21 and the negative line 22, respectively, to enhance the shielding effect of external common-mode noise.

[0039] The oscilloscope probe 3 has a positive probe and a negative probe at one end. The positive probe of the oscilloscope probe 3 is inserted into the first ripple cap 11 in a plug-in manner and is in electrical contact with the inner surface of the first ripple cap 11. The negative probe of the oscilloscope probe 3 is inserted into the second ripple cap 12 in a plug-in manner and is in electrical contact with the inner surface of the second ripple cap 12. When designing the probe, the size should be matched with the inner diameter of the ripple cap to ensure tight contact after insertion and form a good conductive connection. The material of the oscilloscope probe 3 can be a metal with good conductivity and elasticity to ensure reliable contact with the ripple cap module 1. The other end of the oscilloscope probe 3 is connected to the oscilloscope, which can use a standard oscilloscope probe interface to ensure accurate signal transmission to the oscilloscope for measurement.

[0040] One side of the circuit board 4 is connected to the ripple cap module 1 through wires, and the other side is connected to the positive and negative wire module 2 through wires.

[0041] The circuit board 4 plays a supporting and connecting role in the ripple test stress. It not only provides physical support for the ripple cap module 1 and the positive and negative wire module 2, but also optimizes the signal transmission path through reasonable wiring design, further improving the accuracy of measurement.

[0042] One side of the circuit board 4 is fixedly connected to the ripple cap module 1 through welding or pasting, ensuring the stable position of the ripple cap module 1. The other side is fixedly connected to the positive and negative wire module 2 through welding or crimping, ensuring good electrical connection between the positive and negative wire module 2 and the circuit board 4. The circuit board 4 can be designed with corresponding lines and solder joints for electrical connection. The material of the circuit board 4 should have good insulation performance and mechanical strength, such as glass fiber reinforced epoxy resin board.

[0043] The fixed connection between the ripple cap module 1 and the positive and negative wire module 2 and the circuit board 4 can be achieved by welding, crimping, or screwing. The welding method can provide good electrical connection and mechanical stability, the crimping method has the advantages of easy installation and disassembly, which is suitable for scenarios that require frequent module replacement, and the screwing method is suitable for situations that require high module fixation.

[0044] Working principle of power supply ripple test stress ring:

[0045] When the power supply ripple test stress ring is used for power supply ripple measurement, the other end of the positive and negative electrode line module 2 is connected to the same test point of the power supply to be tested, and the other end of the oscilloscope probe 3 is connected to the oscilloscope. The ripple signal of the power supply to be tested is transmitted to the ripple cap module 1 through the positive and negative electrode line module 2, and then collected by the oscilloscope probe 3 and transmitted to the oscilloscope. Since the positive and negative electrode line module 2 adopts a twisted pair structure, it can effectively reduce electromagnetic interference, and the close contact of the ripple cap module 1 and the oscilloscope probe 3 and the reasonable layout of the circuit board 4 ensure the stability and accuracy of signal transmission, so that the oscilloscope can accurately measure the ripple of the power supply.

[0046] The loop formed by the ripple cap module 1, the positive and negative electrode line module 2 and the oscilloscope probe 3 ensures the shortest measurement path, minimizes noise introduction and provides a solid foundation for ripple measurement accuracy; among them, the positive and negative electrode line module 2 adopts a twisted pair structure, which can effectively resist external electromagnetic interference; the close contact of the ripple cap module 1 and the oscilloscope probe 3 reduces the contact resistance and ensures stable signal transmission; and the reasonable layout of the circuit board 4 further optimizes the signal transmission path. Under the joint action of these factors, the stability and accuracy of the ripple signal in the transmission process are ensured, and then the oscilloscope can accurately measure the ripple of the power supply. The ripple cap module 1, the positive and negative electrode line module 2, the oscilloscope probe 3 and the power supply to be tested form a closed loop, and all the connection relationships between the ripple cap module 1, the positive and negative electrode line module 2, the oscilloscope probe 3 and the circuit board 4 are realized through physical contact type electrical connection.

[0047] In addition, the ripple stress ring is self-made, and the cost is very low. The self-made steps are as follows:

[0048] Self-made ripple cap module 1, clean the positive and negative probes of the oscilloscope to ensure that the surface is free of oxidation layer and impurities to ensure good conductivity. Then wrap the copper wire, take one copper wire, fix one end of the copper wire to the head of the positive probe of the oscilloscope probe 3, then use the pointed pliers to assist, tightly wrap the copper wire on the probe, the winding direction should be consistent, such as 3-5 layers of winding, the winding pitch is 1-2 mm, to form the first ripple cap 11. In the same way, wrap another copper wire on the negative probe of the oscilloscope probe 3 to make the second ripple cap 12. Wrap the insulating sleeve outside the wrapped ripple cap module 1, only expose the part that needs to be connected to the positive and negative electrode line module 2 to prevent short circuit. Check the conductivity between the ripple cap module 1 and the probe of the oscilloscope probe 3 with a multimeter to ensure good connection.

[0049] After winding, the end of the first ripple cap 11 is directly connected to one end of the positive electrode wire 21 in the positive and negative electrode wire module 2. The connection method can use welding. If welding conditions are not available, a metal clip with good conductivity can be used to tightly clamp the two together to ensure the stability and conductivity of the connection.

[0050] The self-made positive and negative electrode wire module 2 is first prepared with multiple strands of copper core wires, which are divided into red representing the positive electrode and black representing the negative electrode, and the appropriate length is cut according to the actual test distance with scissors. Then make a twisted pair, place the red and black wires side by side, then twist them together at an interval of about 5 mm, form a twisted pair structure, and use a pencil or other tool to assist in winding to make the winding more uniform and compact. Then connect the ripple cap module 1, weld the one end of the positive electrode wire 21 to the part of the first ripple cap 11 not covered by the insulating sleeve, and the one end of the negative electrode wire 22 to the second ripple cap 12. After welding, check the conductivity with a multimeter. When connecting the power to be tested, appropriate connectors such as banana plugs can be used, and wire strippers can be used to strip about 1-1.5 cm of insulation from both ends of the wire. The stripped wires are inserted into the male and female heads of the banana plug, respectively. If there is no banana plug, the wire ends can be stripped and directly wrapped around the terminal post of the power test point and tightened.

[0051] The oscilloscope probe 3 is self-made. First, disassemble the oscilloscope probe, carefully disassemble the shell of the oscilloscope probe, and remove the internal wires and connectors. Then make a probe. The probe material can be selected from metals with good conductivity and elasticity, such as a common copper wire. The length of the copper wire is about 2-3 cm, and one end of the copper wire is sharpened to facilitate insertion into the ripple cap module 1. The probe and the internal wires of the oscilloscope probe are welded together to ensure a firm weld. Then install the insulating handle. Drill a hole in one end of the insulating handle material, then pass the wire with the welded probe through the hole, and then use glue or electrical tape to secure the wire to the handle, leaving the oscilloscope probe 3 exposed from the handle by a certain distance. Finally, assemble the probe, re-install the processed oscilloscope probe 3 and wires into the shell of the oscilloscope probe, and secure the shell with screws or glue.

[0052] The self-making of the circuit board 4 firstly designs a line, draws the layout of the conductive line on the insulating plate according to the connection requirement of the ripple cap module 1 and the positive and negative electrode line module 2 with a pencil or a marker; the line should be as simple as possible to reduce unnecessary bending; then the copper foil tape is cut, the conductive copper foil tape is cut into appropriate width and length according to the designed line with scissors; then the copper foil tape is pasted: the cut copper foil tape is carefully pasted on the insulating plate, arranged according to the designed line layout, and the connection between the tapes is ensured to be tight without gap; the surface of the copper foil tape can be lightly polished with sandpaper to improve the welding performance; the next step is drilling, the appropriate size hole is drilled on the circuit board 4 according to the installation position of the ripple cap module 1 and the positive and negative electrode line module 2 with a drilling tool, which is used for installing and fixing the modules; finally, the ripple cap module 1 and the positive and negative electrode line module 2 are installed, the two modules are fixed on the circuit board 4 through drilling and welding to ensure good electrical connection; after welding, the continuity and insulation between the lines are checked with a multimeter.

[0053] The embodiments of the specific implementation are the preferred embodiments of the utility model, and are not limited to the protection scope of the utility model, so that: equivalent changes made according to the structure, shape and principle of the utility model should be covered in the protection scope of the utility model.

Claims

1. A power supply ripple test stress ring, characterized in that, It includes a ripple cap module (1), a positive and negative electrode module (2), and an oscilloscope probe (3); The ripple cap module (1) includes a first ripple cap (11) for connecting to the positive electrode and a second ripple cap (12) for connecting to the negative electrode; The positive and negative wire module (2) includes a positive wire (21) and a negative wire (22). One end of the positive wire (21) is electrically connected to the first ripple cap (11), and one end of the negative wire (22) is electrically connected to the second ripple cap (12). The other ends of the positive wire (21) and the other ends of the negative wire (22) are connected to the same test point of the power supply under test. One end of the oscilloscope probe (3) is provided with a positive probe and a negative probe. The positive probe of the oscilloscope probe (3) is inserted into the first ripple cap (11) in a plug-in manner and makes electrical contact with the inner surface of the first ripple cap (11). The negative probe of the oscilloscope probe (3) is inserted into the second ripple cap (12) in a plug-in manner and makes electrical contact with the inner surface of the second ripple cap (12). The other end of the oscilloscope probe (3) is connected to an oscilloscope. The ripple cap module (1), the positive and negative electrode module (2), the oscilloscope probe (3), and the power supply under test form a closed loop.

2. The power supply ripple test stress ring according to claim 1, characterized in that, The first ripple cap (11) is made of copper wire tightly wound around the positive electrode of the oscilloscope probe (3), and the second ripple cap (12) is made of copper wire tightly wound around the negative electrode of the oscilloscope probe (3). Both the first ripple cap (11) and the second ripple cap (12) are in close contact with the metal surface of the oscilloscope probe (3).

3. The power supply ripple test stress ring according to claim 1, characterized in that, The positive wire (21) and the negative wire (22) are intertwined in a tightly attached and parallel manner to form a twisted pair structure.

4. A power supply ripple test stress ring according to claim 1, characterized in that, It also includes a circuit board (4), one side of which is connected to the ripple cap module (1) via a wire, and the other side is connected to the positive and negative wire module (2) via a wire.

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