CN212935773U

CN212935773U - Device for limiting starting current of switching power supply

Info

Publication number: CN212935773U
Application number: CN202021543706.XU
Authority: CN
Inventors: 王明钧; 张东阳
Original assignee: Shanghai Suhu Power Technology Co ltd
Current assignee: Shanghai Suhu Power Technology Co ltd
Priority date: 2020-07-29
Filing date: 2020-07-29
Publication date: 2021-04-09
Anticipated expiration: 2030-07-29

Abstract

The utility model belongs to the technical field of electrical equipment, specifically disclose a device of limit switch power supply starting current, including mounting panel, buffer, mounting box, circuit board, heat abstractor and limiting circuit, be provided with the spout on the mounting panel, the mounting box passes through the buffer setting in the spout, be provided with heat abstractor on the mounting box, be provided with the circuit board in the mounting box, be provided with limiting circuit on the circuit board, limiting circuit includes partial pressure unit, charging unit and drive unit, and after the power switch-on, voltage is by partial pressure unit partial pressure and charge to the charging unit through the rectifier bridge when the voltage of charging unit rises to the conducting voltage of drive unit, the drive unit switches on, and short circuit charging unit and partial pressure unit are supplied power for the load by the power simultaneously.

Description

Device for limiting starting current of switching power supply

Technical Field

The utility model relates to a device of limiting switch power supply starting current belongs to electrical equipment technical field.

Background

It is known that at the instant of power-on and start-up of the driving power supply, a current spike, i.e. a surge current, with a width of about tens of microseconds is generated at the input end due to the charging operation of the internal capacitor of the product. The impact is small when a single product is started, but when a plurality of products are started simultaneously, the impact current generated instantaneously cannot be ignored, and even the impact current affects the starting of power supply equipment or the misoperation of a breaker or an earth leakage switch, so that an impact current suppression circuit needs to be added into an electronic circuit.

The current limiting switch current device is poor in heat dissipation performance mostly, buffering performance is not set, the device is easy to cause poor contact due to the fact that zero devices on a circuit board are affected by vibration after being used for a long time, the current limiting circuit is poor in current restraining effect, and the problem is solved by the device for limiting the starting current of the switch power supply.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a device of restriction switching power supply starting current solves the problem of proposing among the above-mentioned background art.

In order to achieve the above object, the utility model provides a following technical scheme: an apparatus for limiting a starting current of a switching power supply, comprising: including mounting panel, buffer, mounting box, circuit board, heat abstractor and limiting circuit, be provided with the spout on the mounting panel, the mounting box passes through buffer and sets up in the spout, be provided with heat abstractor on the mounting box, be provided with the circuit board in the mounting box, be provided with limiting circuit on the circuit board, limiting circuit includes partial pressure unit, charging unit and drive unit, and after the power switch-on, voltage is by partial pressure unit partial pressure and charge to the charging unit through the rectifier bridge when the voltage of charging unit rises to the conducting voltage of drive unit, the drive unit switches on, and short circuit charging unit and partial pressure unit are supplied power for the load by the power simultaneously.

Preferably, the buffer device comprises a damper and a spring, the two ends of the damper are respectively connected with the mounting box and the sliding groove, and the spring is sleeved on the damper.

Preferably, mounting holes and fixed blocks are symmetrically arranged at two ends of the mounting box, and the mounting box is fixed on the mounting plate through fixing screws and the fixed blocks.

Preferably, the heat dissipation device comprises a heat absorption block, the heat absorption block is arranged in the mounting box, and the heat absorption block is connected with a plurality of uniformly arranged heat dissipation fins.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model belongs to the technical field of electrical equipment, specifically disclose a device of limit switch power supply starting current, can provide the buffer through setting up that the mounting box cushions the cushioning effect and prevents that the circuit board from receiving the components and parts emergence problem on the vibrations influence leads to the circuit board, extender life, the heat abstractor who sets up simultaneously can guarantee its long-time stable work, and the limiting circuit of design effectively suppresses impulse current, the utility model discloses simple structure, convenient operation, the practicality is strong.

Drawings

Fig. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of a heat sink of the present invention;

FIG. 3 is a schematic diagram of the limiting circuit of the present invention;

in the figure: 1. mounting a plate; 2. a buffer device; 3. mounting a box; 4. a circuit board; 5. a heat sink; 6. a limiting circuit; 7. a chute; 8. a voltage dividing unit; 9. a charging unit; 10. a drive unit; 11. a damper; 12. a spring; 13. mounting holes; 14. a fixed block; 15. fixing screws; 16. a heat absorbing block; 17. and a heat sink.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "vertical", "upper", "lower", "horizontal", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Referring to fig. 1-3, the present invention provides a technical solution: the utility model provides a device of restriction switching power supply starting current, includes mounting panel 1, buffer 2, mounting box 3, circuit board 4, heat abstractor 5 and limiting circuit 6, be provided with spout 7 on the mounting panel 1, mounting box 3 passes through buffer 2 and sets up in spout 7, be provided with heat abstractor 5 on the mounting box 3, be provided with circuit board 4 in the mounting box 3, be provided with limiting circuit 6 on the circuit board 4, limiting circuit 6 includes voltage division unit 8, charging unit 9 and drive unit 10, and after the power switch-on, voltage is charged by 8 partial pressures of voltage division unit and to charging unit 9 through the rectifier bridge when charging unit 9's voltage rises to drive unit 10's conduction voltage, and drive unit 10 switches on, and short circuit charging unit 9 and voltage division unit 8 supply power for the load by the power simultaneously.

Further, the buffer device 2 comprises a damper 11 and a spring 12, two ends of the damper 11 are respectively connected with the mounting box 3 and the chute 7, and the damper 11 is sleeved with the spring 12.

Further, mounting holes 13 and fixing blocks 14 are symmetrically arranged at two ends of the mounting box 3, and the mounting box 3 is fixed on the mounting plate 1 through fixing screws 15 and the fixing blocks 14.

Further, the heat dissipation device 5 comprises a heat absorption block 16, the heat absorption block 16 is arranged in the mounting box 3, and a plurality of uniformly arranged heat dissipation fins 17 are connected to the heat absorption block 16.

The working principle is as follows: the utility model relates to a device for limiting starting current of a switch power supply, in use, after the circuit is installed on the device through the installation holes 13 on the two sides of the installation box 3, the installation plate 1 is fixed at the position to be installed, the damper 11 and the spring 12 in the buffer device 2 arranged on the installation plate 1 provide the buffer and shock absorption function of the installation box 3, the components on the circuit board 4 in the installation box 3 are protected from being affected by vibration, the heat generated by the circuit board 4 is quickly absorbed by the heat absorption block 16 and quickly distributed out through the uniformly arranged radiating fins 17, the long-time stable work of the circuit board 4 is ensured, when the power is switched on, the voltage is divided by the resistor R1 in the voltage dividing unit 8 through the rectifier bridge and charges the capacitor C1 in the charging unit 9, the impact current generated in the moment of the power-on starting of the driving power supply is effectively limited, when the capacitor C is charged to about 80% of, the conducting voltage of the driving unit 10 is reached, so that the driving unit 10 is switched on, and the voltage dividing unit 8 and the charging unit 9 are short-circuited, so that the power supply supplies power to the load.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. An apparatus for limiting a starting current of a switching power supply, comprising: comprises a mounting plate (1), a buffer device (2), a mounting box (3), a circuit board (4), a heat dissipation device (5) and a limiting circuit (6), wherein a chute (7) is arranged on the mounting plate (1), the mounting box (3) is arranged in the chute (7) through the buffer device (2), the heat dissipation device (5) is arranged on the mounting box (3), the circuit board (4) is arranged in the mounting box (3), the limiting circuit (6) is arranged on the circuit board (4), the limiting circuit (6) comprises a voltage division unit (8), a charging unit (9) and a driving unit (10), after the power supply is switched on, the voltage is divided by the voltage division unit (8) through a rectifier bridge and charges the charging unit (9), when the voltage of the charging unit (9) rises to the conduction voltage of the driving unit (10), the driving unit (10) is conducted, and meanwhile, the charging unit (9) and the voltage division unit (8) are short-circuited, and the load is supplied with power by the power supply.

2. The apparatus of claim 1, wherein the means for limiting the start-up current of the switching power supply comprises: buffer (2) include attenuator (11) and spring (12), install box (3) and spout (7) are connected respectively to attenuator (11) both ends, the cover is equipped with spring (12) on attenuator (11).

3. The apparatus of claim 1, wherein the means for limiting the start-up current of the switching power supply comprises: mounting box (3) both ends symmetry is provided with mounting hole (13) and fixed block (14), mounting box (3) are fixed on mounting panel (1) through set screw (15) and fixed block (14).

4. The apparatus of claim 1, wherein the means for limiting the start-up current of the switching power supply comprises: the heat dissipation device (5) comprises a heat absorption block (16), the heat absorption block (16) is arranged in the mounting box (3), and a plurality of uniformly arranged heat dissipation fins (17) are connected to the heat absorption block (16).