Separating inductance-adjustable switching power supply transformer test tool
By using a separate, adjustable inductance testing fixture for switching power supply transformers, the problems of core damage and welding damage during the design phase of switching power supply transformers were solved, achieving core protection and simplified electrical connections, and improving testing accuracy and efficiency.
Patent Information
- Application Number
- CN202423278262.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-30
- Publication Date
- 2026-01-27
- Estimated Expiration
- 2034-12-30
AI Technical Summary
In the existing technology, switching power supply transformers require repeated grinding of the magnetic core spacing and repeated welding during the design phase, which leads to problems such as damage to the magnetic core and circuit board.
A separate, adjustable inductance switching power supply transformer test fixture is used. The inductance is adjusted by adjusting the magnetic core spacing through the adjustment module and the pressing module, avoiding damage from magnetic core grinding and welding. A bed of needles is used instead of welding for electrical connection.
It achieves the elimination of the need for core spacing adjustment and simplifies the soldering process, protecting the core and circuit board, and improving testing efficiency and accuracy.
Smart Images
Figure CN223841950U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of testing technology, and in particular relates to a test fixture for a split-type adjustable inductance switching power supply transformer. Background Technology
[0002] CBCT, as a large medical device, uses many components, including motors, motor drivers, high-voltage generators, and switching power supplies. Among these, the switching power supply is a crucial component, converting alternating current (AC) into the required direct current (DC). Within the switching power supply, the transformer is one of the most critical power conversion components. Different coil turns, inductance values, and wire diameters determine the overall performance of the switching power supply. A well-designed transformer ensures good electromagnetic compatibility and extends the lifespan of the switching power supply.
[0003] When designing switching power supply transformers, we typically first calculate parameters using formulas, such as the number of turns in the primary and secondary coils, the primary inductance, and the wire diameter. However, these calculated parameters don't always perfectly match our needs and can introduce errors in practice. Therefore, R&D engineers will first fabricate a transformer based on the calculated parameters and solder it onto the switching power supply circuit board for testing. Adjustments are then made based on the test results. This process requires repeated adjustments, primarily in two aspects: firstly, adjusting the spacing between the upper and lower magnetic cores, currently done through grinding. Grinding the transformer cores is a tedious process; excessive wear in the core gap renders the entire core assembly unusable. Secondly, repeatedly soldering and replacing the transformer on the circuit board is extremely cumbersome, time-consuming, and can damage the circuit board with repeated replacements. Transformers have anywhere from 8 to 16 pins, making soldering and replacement extremely difficult and time-consuming. Summary of the Invention
[0004] To address the technical problem that repeated grinding of the magnetic core during the design phase of existing switching power supply transformers can easily damage the core, this application proposes a separate, adjustable inductance testing fixture for switching power supply transformers, thus solving the aforementioned technical problem.
[0005] The technical solution adopted by this utility model to solve its technical problem is:
[0006] This utility model provides a test fixture for a split-type adjustable inductance switching power supply transformer, including an adjustment module. The adjustment module includes: a support member supported on the lower magnetic core of the transformer; and a transmission assembly including a ceramic plate supported on the upper magnetic core of the transformer. The ceramic plate is configured to move linearly in the vertical direction to drive the upper magnetic core to move linearly in the vertical direction, thereby adjusting the distance between the lower and upper magnetic cores.
[0007] Furthermore, the transmission assembly also includes a motor and a vertically arranged screw fixedly connected to the output shaft of the motor, wherein the ceramic plate is confined on the screw to perform linear motion.
[0008] Furthermore, the transmission assembly has two sets that operate synchronously, with the ceramic plates of the two sets of transmission assemblies respectively supported on the legs of the corresponding upper magnetic core.
[0009] Furthermore, it also includes a pressing module, which comprises: a placement platform for placing the circuit board to be installed on the transformer; a needle bed, the bottom of which is equipped with multiple pins arranged in the same manner as the transformer pins for insertion into the circuit board, the needle bed also being equipped with multiple cables corresponding one-to-one with the pins, one end of each cable being electrically connected to the corresponding pin and the other end being electrically connected to the corresponding transformer pin; and a pressing gate, which is disposed on top of the needle bed to press the needle bed onto the circuit board.
[0010] Based on the above technical solution, the technical effects that this utility model can achieve are as follows:
[0011] This utility model discloses a test fixture for a split-type adjustable inductance switching power supply transformer. The support of the adjustment module is supported on the lower magnetic core of the transformer to prevent it from falling off the transformer frame. A ceramic plate is inserted between the upper and lower magnetic cores. As the ceramic plate moves up and down, it moves the upper magnetic core, causing the gap between the upper and lower magnetic cores to change, thereby changing the transformer's inductance. By adjusting the transformer inductance through the ceramic plate, it is not necessary to repeatedly grind the gap between the upper and lower magnetic cores with a millstone, as is done in the prior art. This avoids wasting magnetic cores and eliminates the troublesome grinding process, solving the technical problem in the prior art that the repeated grinding of the magnetic core during the design stage of switching power supply transformers easily leads to magnetic core damage.
[0012] This utility model discloses a separate, adjustable inductance switching power supply transformer testing fixture. The press-fit module uses a bed of needles to electrically connect the transformer and the circuit board. The needles of the bed of needles are arranged identically to the pins of the transformer. One end of the cable of the bed of needles is electrically connected to a pin of the transformer, and the other end is electrically connected to a pin of the bed of needles. The bed of needles replaces the transformer and is press-fitted onto the circuit board. A pressure switch presses down on the top of the bed of needles, pressing the pins of the bed of needles into the corresponding sockets on the circuit board, ensuring full contact between the pins and the circuit board, completing the electrical connection for testing. During testing, lifting the pressure switch allows the bed of needles to be removed from the circuit board for transformer repair. Generally, it is not necessary to disconnect the connection between the cable of the bed of needles and the pins of the transformer. Even if disconnection is necessary, the connection between the individual cable and the pins is much simpler and more convenient than removing the soldered transformer from the circuit board, minimizing damage to the transformer and circuit board. This solves the technical problem in existing technologies where repeated soldering and replacement of the transformer on the circuit board causes damage to the circuit board. Attached Figure Description
[0013] Figure 1 This is a schematic diagram of the adjustment module of the test fixture for the discrete inductance adjustable switching power supply transformer of this utility model.
[0014] Figure 2 This is a schematic diagram of the press-fit module of the test fixture for the discrete inductance adjustable switching power supply transformer of this utility model.
[0015] Figure 3 This is a schematic diagram of the needle bed of the press-fit module of the test fixture for the discrete inductance adjustable switching power supply transformer of this utility model.
[0016] Figure 4 This is a schematic diagram of the transformer frame of the test fixture for the discrete adjustable inductance switching power supply transformer of this utility model.
[0017] Wherein: a1-upper magnetic core, a2-lower magnetic core, a3-frame, a31-pin; b-circuit board; 1-adjustment module, 11-support component, 12-transmission assembly, 121-ceramic sheet, 122-motor, 123-screw; 2-pressing module, 21-placement platform, 22-needle bed, 221-pin, 222-cable, 23-pressing switch. Detailed Implementation
[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present utility model or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.
[0019] It should be noted that the application scenario of this utility model of a split-type adjustable inductance switching power supply transformer test fixture is in the early research and development testing stage. By changing the distance between the upper magnetic core a1 and the lower magnetic core a2, the inductance can be adjusted to obtain other preset performance parameters in the host computer, and a numerically accurate template can be made to obtain the accurate number of turns of the transformer's primary and secondary coils and the primary inductance, rather than for later mass production.
[0020] The switching power supply transformer consists of three parts: the frame a3, the magnetic core, and the coil.
[0021] like Figure 1-4 As shown, the present invention discloses a test fixture for a switch power supply transformer with adjustable inductance, comprising an adjustment module 1. The adjustment module 1 includes a support member 11 and a transmission assembly 12. The support member 11 is supported on the lower magnetic core a2 of the transformer. The transmission assembly 12 includes a ceramic plate 121 supported on the upper magnetic core a1 of the transformer. The ceramic plate 121 is configured to move linearly in the vertical direction to drive the upper magnetic core a1 to move linearly in the vertical direction, thereby adjusting the distance between the lower magnetic core a2 and the upper magnetic core a1, thereby achieving the purpose of adjusting the transformer inductance.
[0022] In one specific embodiment of this utility model, the transmission assembly 12 further includes a motor 122 and a screw 123 vertically arranged and fixedly connected to the output shaft of the motor 122. The ceramic plate 121 is limited on the screw 123 to perform linear motion. The motor 122 can be a stepper motor 122, which is inexpensive and has high precision.
[0023] Furthermore, there are two sets of transmission components 12 that operate synchronously, with the ceramic plates 121 of the two sets of transmission components 12 respectively supported on the legs of the corresponding upper magnetic core a1.
[0024] It should be noted that both the upper magnetic core a1 and the lower magnetic core a2 are U-shaped components. The two U-shaped components are connected to the transformer frame a3. That is to say, the frame a3 is configured at the U-shaped holes of the two U-shaped components. A single ceramic plate 121 will be blocked by the frame a3 and cannot be supported on the two legs of the upper magnetic core a1 at the same time. Therefore, two sets of synchronously operating transmission components 12 need to be configured.
[0025] The present invention discloses a test fixture for a split-type adjustable inductance switching power supply transformer, which further includes a pressing module 2. The pressing module 2 includes a placement platform 21, a needle bed 22, and a pressure gate 23. The placement platform 21 is used to place the circuit board b on which the transformer is to be installed. The bottom of the needle bed 22 is provided with multiple pins 221 arranged in the same manner as the pins a31 of the transformer for insertion into the circuit board b. The needle bed 22 is also provided with multiple cables 222 corresponding one-to-one with the pins 221. One end of the cable 222 is electrically connected to the corresponding pin 221, and the other end is electrically connected to the corresponding pin a31 of the transformer. The connection can be made by welding. The pressure gate 23 is disposed on the top of the needle bed 22 to press the needle bed 22 onto the circuit board b.
[0026] The function of the needle bed 22 is to provide a better force application position for the pressure gate 23, and the needles 221 of the needle bed 22 can be made thicker than the tube pins a31 of the transformer, so as to achieve better electrical connection with the circuit board b during press fitting.
[0027] The present invention relates to a test fixture for a split-type adjustable inductance switching power supply transformer. The test steps are as follows:
[0028] 1. Fix the switching power supply circuit board b to be tested on the test fixture placement platform 21. Except for the transformer, all other components of the circuit board b have been soldered.
[0029] 2. Align the pins 221 of the needle bed 22 with the transformer encapsulation of the switching power supply quasi-circuit board b, so that the pins 221 and the insertion holes at pins a31 of the switching power supply quasi-circuit board encapsulation correspond one-to-one. Press the pressure gate 23 of the test fixture to make full contact between the needle bed 22 and the switching power supply circuit board b.
[0030] 3. The cable 222 of the needle bed 22 is soldered to the corresponding pin a31 of the transformer sample. The transformer is placed in the adjustment module 1, and the two ceramic plates 121 are clipped between the upper magnetic core a1 and the lower magnetic core a2 of the transformer.
[0031] 4. Connect the input and output terminals of the test switching power supply board, test its working performance, and adjust the number of transformer turns and inductance to meet the required transformer parameters.
[0032] 5. Use a bridge circuit to test the inductance of a qualified transformer and record the number of primary and secondary turns at that time.
[0033] It should be understood that the specific embodiments described above are only for explaining the present invention and are not intended to limit the present invention. Obvious variations or modifications derived from the spirit of the present invention are still within the protection scope of the present invention.
Claims
1. A test fixture for a split-type adjustable inductance switching power supply transformer, characterized in that, The adjustment module (1) includes: Support member (11), which is supported on the lower magnetic core (a2) of the transformer; The transmission assembly (12) includes a ceramic plate (121) supported on the upper magnetic core (a1) of the transformer. The ceramic plate (121) is configured to move linearly in the vertical direction to drive the upper magnetic core (a1) to move linearly in the vertical direction, thereby adjusting the distance between the lower magnetic core (a2) and the upper magnetic core (a1).
2. The test fixture for a split-type adjustable inductance switching power supply transformer according to claim 1, characterized in that, The transmission assembly (12) also includes a motor (122) and a screw (123) arranged vertically and fixedly connected to the output shaft of the motor (122), wherein the ceramic plate (121) is limited to the screw (123) to make linear motion.
3. The test fixture for a split-type adjustable inductance switching power supply transformer according to claim 1 or 2, characterized in that, The transmission assembly (12) has two sets and operates synchronously. The ceramic plates (121) of the two sets of transmission assemblies (12) are respectively supported on the legs of the corresponding upper magnetic core (a1).
4. The test fixture for a split-type adjustable inductance switching power supply transformer according to claim 1, characterized in that, It also includes a pressing module (2), which comprises: A placement platform (21) is used to place the circuit board (b) to be installed on the transformer; A needle bed (22) is provided at the bottom of which multiple pins (221) are arranged in the same manner as the pins (a31) of the transformer for insertion into the circuit board (b). The needle bed (22) is also provided with multiple cables (222) that correspond one-to-one with the pins (221). One end of each cable (222) is electrically connected to the corresponding pin (221), and the other end is electrically connected to the corresponding pin (a31) of the transformer. A pressure gate (23) is disposed on top of the needle bed (22) to press the needle bed (22) onto the circuit board (b).