Micropower power supply module with novel structure

Abstract

The utility model discloses a micropower power supply module with a novel structure, which comprises a PCB (printed circuit board) (1), an electronic component (3), a transformer (2) and module pins (4), the electronic component (3) is arranged on the PCB (1), the transformer (2) comprises a magnetic core (21) and a coil (22), the coil (22) is a printed board coil and is integrated on the PCB (1), the magnetic core (21) is arranged on the PCB (1) at a position corresponding to the coil (22), and the module pins (4) are arranged on the PCB (1). And the module pins (4) are welded on the side surface of the PCB (1). The transformer (2) only needs to be buckled with a magnetic core and fixed through dispensing, the transformer manufacturing efficiency can be improved, the coil processing risk is avoided, meanwhile, the printed board coil manufacturing technology is mature and high in reliability, full-automatic production is adopted in the whole production process, the labor cost is saved, the reliability is improved, and meanwhile the production efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the field of power supply modules, in particular to a micro-power supply module with a novel structure. Background Art

[0002] With the rapid development of power electronics technology, power electronic equipment is increasingly closely related to people's work and life, and electronic equipment cannot do without a reliable power supply. In recent years, micro-power power modules have been widely used in industrial instruments, medical instruments, communication systems, industrial automation, data communication interfaces and other fields.

[0003] The internal structure of a traditional micropower supply is as follows: Figure 1 As shown, it is composed of a transformer, a PCB board, and electronic components. The transformer is a magnetic ring transformer or a skeleton transformer. This type of traditional transformer is made of enameled wire wound on a magnetic ring or a skeleton. The damage of the enameled wire cannot be eliminated during the winding process, which has a great impact on the service life and reliability of the product. In addition, the magnetic ring transformer generally has 6 or 9 lead terminals. In order to realize the electrical function, the leads of the magnetic ring transformer need to be welded to the pads on the PCB board to form an electrical relationship. Since the pins are very thin, welding is difficult, the welding time is long, and processing is difficult. The use of a small skeleton-type winding transformer can effectively improve the processing difficulty, but due to the complex structure, it has high requirements for workers' operation and also brings risks. Summary of the invention

[0004] The purpose of the utility model is to overcome the deficiencies of the prior art and provide a micro-power supply module with a new structure.

[0005] The purpose of this utility model is achieved through the following technical solutions:

[0006] The utility model provides a micro-power supply module with a novel structure, the micro-power supply module comprising a PCB board, electronic components, a transformer and module pins, the electronic components are arranged on the PCB board, the transformer comprises a magnetic core and a coil, the coil is a printed circuit board coil, integrated on the PCB board, the magnetic core is installed on the PCB board at a position corresponding to the coil, and the module pins are welded on the side of the PCB board.

[0007] Furthermore, the electronic components include an input filter capacitor C1, a control chip U1, a resistor R1, an output filter capacitor C2, a common cathode diode D1 and a voltage regulator diode D2. The coil includes a primary winding and a secondary winding. The input filter capacitor C1 is connected in parallel between the voltage input terminal and the ground terminal. The input pin of the control chip U1 is connected to the voltage input terminal, the ground pin of the control chip U1 is connected to the ground terminal, the clock pin of the control chip U1 is connected in series with the resistor R1 and then connected to the ground terminal. The first output pin and the second output pin of the control chip U1 are connected to the primary winding. The secondary winding is a center-tapped winding. The two ends of the secondary winding are respectively connected to the common cathode diode D1 and then connected to the voltage output terminal. The center tap of the secondary winding is connected to the power supply ground terminal. The output filter capacitor C2 is connected in parallel between the voltage output terminal and the power supply ground terminal, and the voltage regulator diode D2 is also connected in parallel between the voltage output positive terminal and the power supply ground terminal.

[0008] Furthermore, the transformer is a planar transformer.

[0009] Furthermore, the PCB board is provided with a module pin pad, and the module pin is soldered on the PCB board through the module pin pad.

[0010] The beneficial effects of the utility model are:

[0011] 1) The coil of the transformer of the utility model is integrated into the PCB board, and no additional coil winding is required, which makes processing more convenient;

[0012] 2) The transformer of the utility model only needs to buckle the magnetic core and fix it with glue, which improves the manufacturing efficiency of the transformer and avoids the risk of coil processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the internal structure of a traditional micro-power supply module;

[0014] Figure 2 This is a schematic diagram of the internal structure of a micro-power supply module with a new structure according to an embodiment of the utility model;

[0015] Figure 3 A circuit diagram of a micro-power supply module of a novel structure according to an embodiment of the utility model;

[0016] Figure 4 A schematic diagram of the structural layout of a PCB board of a micro-power supply module with a novel structure according to an embodiment of the utility model;

[0017] In the figure, 1-PCB board, 2-transformer, 3-electronic components, 4-module pins, 5-module pin pads, 21-magnetic core, 22-coil, 6-magnetic ring transformer. DETAILED DESCRIPTION

[0018] The following will be combined with the embodiments to clearly and completely describe the technical solution of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the utility model.

[0019] For example, the internal structure of a conventional micropower supply is as follows: Figure 1 As shown, it is composed of a magnetic ring transformer 6, a PCB board 1, and electronic components 4. The transformer used in a traditional micro-power power supply can also be a skeleton transformer. This type of traditional transformer is wound with enameled wire on a magnetic ring or a skeleton. The damage of the enameled wire cannot be eliminated during the winding process, which has a great impact on the service life and reliability of the product. The magnetic ring transformer 6 generally has 6 or 9 lead terminals. In order to achieve electrical functions, the leads of the magnetic ring transformer 6 need to be welded to the pads on the PCB board 1 to form an electrical relationship. The traditional welding process usually relies on manual welding with a soldering iron, which not only requires the operator to have certain welding skills and experience, but also requires long-term repetitive labor, which easily leads to low work efficiency and unstable welding quality; due to the limitations of manual welding, the welding quality is easily affected by human factors, such as welding temperature, welding time, welding pressure, etc.; the instability of these factors may lead to electrical problems such as loose welding points, cold welding, short circuits, etc., thereby affecting the performance and reliability of the product; manual welding requires a lot of manpower and time, increasing production costs. At the same time, due to the instability of welding quality, subsequent inspection and repair work may be required, further increasing the cost; as the manufacturing industry develops towards automation and intelligence, manual welding has gradually failed to meet the needs of large-scale and high-efficiency production; and the lead welding process of magnetic toroidal transformers is often difficult to achieve automated production due to its complexity and particularity; manual welding requires the use of high-temperature soldering irons, which poses certain safety hazards. Improper operation or equipment failure may cause fires, burns and other accidents.

[0020] The structural schematic diagram of the utility model is as follows Figure 2 As shown, it includes a PCB board 1, electronic components 3, a transformer 2, and module pins 4. The electronic components 3 are connected to the PCB board 1, and the transformer 2 is arranged in the middle of the PCB board 1; a lead terminal is welded on one side as the module pin 4. The transformer 2 used in the utility model includes a magnetic core 21 and a coil 22, wherein the magnetic core 21 is a ferrite planar magnetic core, and the coil 22 of the transformer 2 is a printed circuit board coil, which is integrated on the PCB board 1. The specific structure of the PCB board 1 is as shown in FIG. Figure 4As shown, the beneficial effects compared with the traditional magnetic ring transformer 6 and the skeleton transformer are: it avoids the problems that may occur when the traditional winding transformer adopts manual winding, such as uneven winding, misalignment, etc., thereby improving the consistency and stability of the product. The production of traditional winding transformers is mostly labor-intensive, and the production process requires a lot of manpower. The transformer integrated in the PCB board 1 can improve the product yield and reduce the labor cost based on the characteristics of fully automated production; this helps to install in a limited space, save space for equipment and circuit boards, and is also convenient for transportation and installation; the transformer on the PCB board 1 adopts a planar magnetic core to improve the heat dissipation performance, which helps to reduce the operating temperature of the transformer and extend its service life; the coil 22 of the transformer 2 is integrated into the PCB board 1, and there is no need to wind the coil 22 additionally, only the magnetic core 21 needs to be buckled and fixed by glue, and the PCB board 1 is provided with a module pin pad 5, and the module pin 4 is welded on the PCB board 1 through the module pin pad 5, which can improve the transformer manufacturing efficiency and avoid the risk of coil processing.

[0021] For example, the circuit structure of the present invention is as follows: Figure 3 As shown, the input filter capacitor C1 is connected in parallel between the voltage input terminal and the ground terminal, and is used to filter the input voltage. The filtered input voltage is connected to the input pin of the control chip U1; the control chip U1 integrates a full-bridge structure MOS tube inside, and has short-circuit protection and over-temperature protection; the clock pin of the control chip U1 is connected in series with the resistor R1 and then connected to the ground terminal, which is used to adjust the working frequency of the circuit; the first output pin and the second output pin of the control chip U1 are connected to the primary winding of the transformer; the secondary winding of the transformer is a center-tapped winding, and its two ends are respectively connected to the common cathode diode D1, which is connected to the output voltage terminal after connection; the center tap of the secondary winding is connected to the power ground terminal, and the filter capacitor C2 is connected in parallel between the voltage output terminal and the power ground to ensure the stability of the output voltage, and the voltage output terminal and the power ground are also connected in parallel with the voltage regulator diode D2; due to the use of an integrated control chip, and the MOS tube is also integrated inside, and a full-bridge topology is adopted, so only one primary winding of the transformer 2 is required. At the same time, the operating frequency of the circuit can be made very high. It can be seen from the inversely proportional relationship between the circuit operating frequency and the number of turns of the coil 22 of the transformer 2 and the cross-sectional area of ​​the magnetic core 21 of the transformer 2 that, under the same cross-sectional area, the higher the operating frequency of the transformer 2, the number of turns of the coil 22 of the transformer can be greatly reduced. The present invention adopts a special magnetic core design, and the cross-sectional area of ​​the magnetic core 21 is larger than the ordinary cross-sectional area, which further reduces the number of turns of the coil 22 of the transformer 2. Therefore, it is most appropriate to adopt a planar transformer design, and the coil of the transformer is integrated into the PCB board 1 to reduce the difficulty of the production and processing technology.

[0022] The above is only a preferred embodiment of the utility model. It should be understood that the utility model is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not deviate from the spirit and scope of the utility model, and should be within the scope of protection of the claims attached to the utility model.

Claims

1. A novel micro-power supply module, characterized in that: The micro-power supply module comprises a PCB board (1), electronic components (3), a transformer (2) and module pins (4); the electronic components (3) are arranged on the PCB board (1); the transformer (2) comprises a magnetic core (21) and a coil (22); the coil (22) is a printed circuit board coil integrated on the PCB board (1); the magnetic core (21) is mounted on the PCB board (1) at a position corresponding to the coil (22); and the module pins (4) are welded on the side of the PCB board (1).

2. The novel micro-power supply module according to claim 1 is characterized in that: The electronic components (3) include an input filter capacitor C1, a control chip U1, a resistor R1, an output filter capacitor C2, a common cathode diode D1 and a voltage regulator diode D2. The coil (22) includes a primary winding and a secondary winding. The input filter capacitor C1 is connected in parallel between a voltage input terminal and a ground terminal. The input pin of the control chip U1 is connected to the voltage input terminal. The ground pin of the control chip U1 is connected to the ground terminal. The clock pin of the control chip U1 is connected in series with a resistor R1 and then connected to the ground terminal. The first output pin and the second output pin of the control chip U1 are connected to the primary winding. The secondary winding is a winding with a center tap. The two ends of the secondary winding are respectively connected to the common cathode diode D1 and then connected to the voltage output terminal. The center tap of the secondary winding is connected to the power supply ground terminal. The output filter capacitor C2 is connected in parallel between the voltage output terminal and the power supply ground terminal. The voltage regulator diode D2 is also connected in parallel between the voltage output positive terminal and the power supply ground terminal.

3. The novel micro-power supply module according to claim 1 is characterized in that: The transformer (2) is a planar transformer.

4. The novel micro-power supply module according to claim 1 is characterized in that: The PCB board (1) is provided with a module pin pad (5), and the module pin (4) is soldered on the PCB board (1) via the module pin pad (5).

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