Switching power supply

Abstract

The utility model discloses a switching power supply, which at least comprises a safety device, and the safety device is completely wrapped in a sealing material, so that the safety distance is reduced. Other devices of the switching power supply are all or at least partially exposed in the air, so that the weight of the product is reduced. The switch power supply realizes solid insulation or reduces pollution level through local encapsulation, thereby reducing safety distance, size and product weight, and effectively reducing product cost.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of switching power supply, especially relates to the switching power supply of high voltage input needs to satisfy the authentication standard. BACKGROUND

[0002] In recent years, with the solar power generation, wind power generation, hydroelectric power generation and other technologies are increasingly mature. In the power generation control system and power transmission system, the switching power supply input voltage applied to such systems is getting higher and higher, up to thousands of volts. Limited by the safety distance in the authentication standard, the electrical clearance and the creepage distance of the switching power supply primary and secondary increase with the increase of the system input voltage, and the distance requirement increases to tens of millimeters or even longer, which limits the product volume design.

[0003] The switching power supply isolation band needs to satisfy the insulation distance required by the safety regulation authentication. The higher the input voltage, the higher the safety distance (including the electrical clearance and the creepage distance), and the longer the distance. Thus, the product design is limited, and the volume becomes larger. The conventional scheme is to reduce the pollution level or achieve solid insulation by overall potting of the product, thereby reducing the safety distance. However, this way increases the weight of the product and has high cost.

[0004] These shortcomings will be further expanded in actual high-voltage applications, such as in a high-input-voltage (greater than 1000V) circuit. If a general optocoupler is still used, it will not meet the safety distance requirements. Therefore, a special optocoupler with a larger pin pitch is required. Currently, there are also special optocouplers with large pin pitches, but the material cost is too high, and the development cost is large. The overall potting method results in high overall weight of the product, low power density, and difficulty in meeting the development requirements of green power supply. INVENTION CONTENTS

[0005] The technical problem to be solved by the utility model is to provide a switching power supply that at least overcomes at least one of the defects in the prior art to some extent.

[0006] The invention concept of the utility model is to solve the problem of high product weight caused by overall potting of the product to meet the reduction of the pollution level and the safety distance by local potting.

[0007] Based on the above invention concept, the utility model provides the technical scheme of the embodiment of the switching power supply as follows:

[0008] A switching power supply at least includes a safety device, wherein: the safety device is completely wrapped in a sealing material, thereby reducing the safety distance; and other devices of the switching power supply are all or at least partially exposed to the air, thereby reducing the product weight.

[0009] As a specific implementation, the sealing material is potting compound.

[0010] As a specific embodiment, the potting material is an epoxy resin.

[0011] As a specific embodiment, the safety device is an optocoupler, a digital isolator or a transformer.

[0012] Further, the safety device is surrounded by a dam structure, and the sealing material is filled in the dam structure, so as to completely wrap the safety device in the sealing material.

[0013] As a specific embodiment, the height of the dam structure is greater than the height of the safety device.

[0014] As a specific embodiment, the dam structure is an epoxy plate or a dam glue.

[0015] As a specific embodiment, the switching power supply is a switching power supply.

[0016] As a specific embodiment, the switching power supply is a switching power supply with high input voltage.

[0017] As a specific embodiment, the input voltage of the switching power supply is greater than 1000V.

[0018] It should be noted that the safety device of the utility model includes but is not limited to a primary-to-secondary isolation belt device, a secondary-to-PE isolation belt device and a primary-to-PE isolation belt device.

[0019] The utility model discloses the beneficial effect lies in: through the partial potting of safety device, make product in satisfying the safety regulation certification requirement, reduce the pollution level or realize solid insulation, can reduce the safety regulation distance simultaneously, thereby can reduce the PCB board's layout area, be favorable to reduce the volume of product, and because other devices are all or at least partially exposed to the air, thereby compared with the overall potting of product, lighter, lower cost, simpler process. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the schematic diagram before the partial potting of the safety device in the switching power supply of the utility model;

[0021] Figure 2 It is the schematic diagram after the partial potting of the safety device in the switching power supply of the utility model;

[0022] The reference signs are: 1-safety device; 2-sealing material; 3-dam structure. DETAILED DESCRIPTION

[0023] The beneficial effects of the present application will be further described in detail in connection with the specific embodiments and the accompanying drawings of the description. However, the specific embodiments of the present application are not limited thereto.

[0024] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0025] Unless otherwise specified, all technical and scientific terms used in the present application have the same meaning as commonly understood by those skilled in the art to which the present application belongs.

[0026] In the present application, unless otherwise stated, the orientation words such as "up, down, left, right" and the like are generally directed to the direction shown in the drawings, or the direction of the components themselves in the vertical, vertical or gravity direction; similarly, for the convenience of understanding and description, "inner, outer" refers to the inner and outer relative to the contour of the components themselves, but the above orientation words are not used to limit the present application.

[0027] Figure 1 A schematic view of the safety device in the switching power supply of the present application before partial potting, Figure 2 A schematic view of the safety device in the switching power supply of the present application after partial potting, please see Figure 2 The switching power supply includes a safety device 1 and a sealing material 2, the safety device 1 is completely wrapped in the sealing material, thereby reducing the safety distance, and other devices of the switching power supply are all or at least partially exposed to the air (not shown in the figure), thereby reducing the product weight.

[0028] The sealing material 2 therein can be selected from potting material, preferably epoxy resin.

[0029] Please see Figure 1 The safety device therein is an optical coupling, a digital isolator or a transformer, it should be noted that Figure 1 The safety device in the present application has three, which is only an example, and should not be regarded as a limitation on the protection scope of the present application, and the number of safety devices can be selected by those skilled in the art according to the needs.

[0030] Please continue to see Figure 1 And Figure 2The safety device 1 is surrounded by a dam structure 3, and the sealing material 2 is filled in the dam structure 3, so that the safety device 1 is completely wrapped in the sealing material 2, and the dam structure 3 is arranged to facilitate the implementation of the partial potting process of the safety device, so that the appearance of the sealing material after forming is consistent; the shape of the dam structure 3 is preferably square; further, the height of the dam structure 3 is greater than the height of the safety device 1, which can avoid the overflow of the sealing material, and the sealing effect will be better; specifically, the dam structure is preferably an epoxy plate or dam glue.

[0031] Figure 1 and Figure 2 The structure is especially suitable for a switching power supply with high input voltage, and specifically, especially suitable for a switching power supply with an input voltage greater than 1000V.

[0032] For example, for a switching power supply with a 1500VDC input, it needs to meet the IEC / EN62109 certification standard, and the primary-to-secondary creepage distance requirement is 32mm, and the pollution level or solid insulation is reduced by partial potting, and the measured creepage distance requirement can be reduced from 32mm to 8mm, thereby saving the PCB layout area for the layout of the safety device, and facilitating the reduction of the PCB layout area of the entire product.

[0033] The above embodiments are only used to help understand the method and core idea of the utility model, and for ordinary skilled persons in the art, on the premise of not departing from the principle of the utility model, other equivalent application schemes that can be naturally thought of through the above description and examples, and several improvements and modifications of the utility model, all fall within the protection scope of the claims of the utility model.

Claims

1. A switching power supply, comprising at least one safety device, characterized in that: The safety devices are completely encased in a sealing material, thereby reducing safety distances; all or at least part of the other components of the switching power supply are exposed to the air, thereby reducing product weight.

2. The switching power supply according to claim 1, characterized in that: The sealing material is a potting compound.

3. The switching power supply according to claim 2, characterized in that: The potting compound is epoxy resin.

4. The switching power supply according to claim 1, characterized in that: The safety devices are optocouplers, digital isolators, or transformers.

5. The switching power supply according to claim 1, characterized in that: The safety device is surrounded by a dam structure, and the sealing material is filled in the dam structure, thereby completely enclosing the safety device in the sealing material.

6. The switching power supply according to claim 5, characterized in that: The height of the dam structure is greater than the height of the safety device.

7. The switching power supply according to claim 5, characterized in that: The dam structure is square.

8. The switching power supply according to claim 5, characterized in that: The dam structure is made of epoxy board or dam adhesive.

9. The switching power supply according to any one of claims 1 to 8, characterized in that: The switching power supply is a high input voltage switching power supply.

10. The switching power supply according to claim 9, characterized in that: The input voltage of the switching power supply is greater than 1000V.

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