CN213125846U

CN213125846U - PWM control negative pressure system

Info

Publication number: CN213125846U
Application number: CN202022379580.3U
Authority: CN
Inventors: 陈孝骥
Original assignee: Shanghai Guanzhong Information Technology Co ltd
Current assignee: Shanghai Guanzhong Information Technology Co ltd
Priority date: 2020-10-22
Filing date: 2020-10-22
Publication date: 2021-05-04
Anticipated expiration: 2030-10-22

Abstract

The utility model particularly relates to a PWM control negative pressure system, including the PWM controller, DC-DC step-down chip and MAX749 negative pressure conversion chip, and when using, the PWM controller is connected with MAX749 negative pressure conversion chip through DC-DC step-down chip, and then improve the stability when the negative pressure conversion, it is undulant to avoid the voltage to produce, there is the protection casing through the upper end fixed mounting at the controller main part, and scribble shielding coating at the surface of protection casing, and then better shielding effect that plays, and be equipped with the coolant liquid between protection casing and silica gel water proof membrane, be convenient for cool down the control main part, and be equipped with radiating fin, be convenient for carry out heat conduction to the outside with the heat in the coolant liquid through radiating fin, be convenient for dispel the heat, further improve the radiating effect of control main part, improve the life of PWM controller.

Description

PWM control negative pressure system

Technical Field

The utility model relates to an electronic circuit technical field, in particular to PWM control negative pressure system.

Background

At present, electronic product wide presence is in people's daily life, big to car household electrical appliances, little to the computer telephony, bring very big service and convenience for people's life, in the current electronic product, only an input voltage usually, but the required voltage of each module is the diverse in the circuit, this has just led to having several voltage in the whole circuit simultaneously, still need the negative pressure in some times, when needing the negative pressure, often change through the converter, but when the conversion, there is the unstable problem of conversion voltage, and when long-time use, often can produce more heat on the controller, make the heat pile up, influence the life of controller.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a PWM control negative pressure system to when carrying out the negative pressure conversion that proposes in solving above-mentioned background art, when having voltage instability and long time use, cause the heat to pile up, lead to the problem that controller life reduces.

In order to achieve the above object, the utility model provides a following technical scheme: the utility model provides a PWM control negative pressure system, includes PWM controller, DC-DC step-down chip and MAX negative pressure conversion chip, the PWM controller passes through DC-DC step-down chip electric connection MAX negative pressure conversion chip, just the PWM controller includes the control main part, the equal fixed mounting in both sides of control main part has the end foot, the PWM controller passes through the end foot with DC-DC step-down chip looks electric connection, just even fixed mounting has the through-hole on the end foot.

Preferably, the upper end of the control main body is sleeved with a protective cover, and the outer surface of the protective cover is coated with a shielding coating.

Preferably, the outer surface of the control main body is fixedly provided with a silica gel waterproof membrane in the protective cover.

Preferably, the protection casing with it has the coolant liquid to pour into between the silica gel water proof membrane into, just the volume of coolant liquid is less than the protection casing with volume between the silica gel water proof membrane, the protection casing with the gap is left to upper end between the silica gel water proof membrane.

Preferably, the even fixed mounting of upper surface of protection casing has radiating fin, just radiating fin's one end extends to the inside of protection casing, just radiating fin's one end with the silica gel water proof membrane contacts.

Preferably, water holes are uniformly formed in the lower ends of the radiating fins, and the cooling liquid passes through the water holes.

Preferably, the upper ends of the radiating fins are uniformly provided with air passing holes, and the air passing holes are located at the upper ends of the protective covers.

The utility model discloses a technological effect and advantage:

1. the utility model discloses a be equipped with DC-DC step-down chip, when using, the PWM controller is connected with MAX749 negative pressure conversion chip through DC-DC step-down chip, and then improves the stability when the negative pressure conversion, avoids voltage to produce undulantly.

2. The utility model discloses an upper end fixed mounting at the controller main part has the protection casing, and scribble shielding coating at the surface of protection casing, and then the better shielding effect that plays, and be equipped with the coolant liquid between protection casing and silica gel water proof membrane, be convenient for cool down the control main part, and be equipped with radiating fin, be convenient for carry out heat-conduction to the outside with the heat in the coolant liquid through radiating fin, be convenient for dispel the heat, further improve the radiating effect of control main part, improve the life of PWM controller.

Drawings

Fig. 1 is a schematic structural diagram of a PWM controller according to the present invention;

FIG. 2 is a system diagram of the structure of the present invention;

FIG. 3 is a front sectional view of a PWM controller according to the present invention;

fig. 4 is a partial enlarged view of a position a in the structure of the present invention.

In the figure: 1. a PWM controller; 2. a DC-DC voltage reduction chip; 3. MAX749 negative pressure conversion chip; 4. a control body; 5. an end pin; 6. a through hole; 7. a protective cover; 8. a barrier coating; 9. a silica gel waterproof membrane; 10. cooling liquid; 11. a gap; 12. a heat dissipating fin; 13. water passing holes; 14. and (4) air passing holes.

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.

Referring to fig. 1-4, the present invention provides a technical solution:

the utility model provides a PWM control negative pressure system, including PWM controller 1, DC-DC step-down chip 2 and MAX749 negative pressure conversion chip 3, PWM controller 1 is through 2 electric connection MAX749 negative pressure conversion chip 3 of DC-DC step-down chip, and PWM controller 1 includes control main part 4, the equal fixed mounting in both sides of control main part 4 has terminal pin 5, PWM controller 1 is through

terminal pin

5 and 2 looks electric connection of DC-DC step-down chip, and even fixed mounting has through-hole 6 on the terminal pin 5.

In this embodiment, the upper end of the control main body 4 is sleeved with the protective cover 7, and the outer surface of the protective cover 7 is coated with the shielding coating 8, so as to protect the control main board 4 and reduce the external interference.

In this embodiment, the outer surface of the control main body 4 and the inside of the protective cover 7 are fixedly provided with the silica gel waterproof film 9, so that the heat on the control main body 4 is conveniently conducted by the silica gel waterproof film 9.

In this embodiment, the cooling liquid 10 is injected between the protective cover 7 and the silica gel waterproof membrane 9, the volume of the cooling liquid 10 is smaller than the volume between the protective cover 7 and the silica gel waterproof membrane 9, a gap 11 is reserved at the upper end between the protective cover 7 and the silica gel waterproof membrane 9, the cooling liquid 10 can flow between the protective cover 7 and the silica gel waterproof membrane 9, and then the controller main body 4 can be cooled by heat dissipation.

In this embodiment, the upper surface of the protective cover 7 is uniformly and fixedly provided with the heat dissipation fins 12, one ends of the heat dissipation fins 12 extend into the protective cover 7, and one ends of the heat dissipation fins 12 are in contact with the silica gel waterproof film 9, so that heat in the cooling liquid 10 is conducted to the outside through the heat dissipation fins 12, and the heat dissipation efficiency is improved.

In this embodiment, the lower end of the heat dissipating fin 12 is uniformly opened with water holes 13, and the cooling liquid 10 passes through the water holes 13, so as to facilitate the heat in the cooling liquid 10 to enter the heat dissipating fin 12.

In this embodiment, the upper end of the heat dissipating fin 12 is uniformly provided with the air passing hole 14, and the air passing hole 14 is located at the upper end of the protective cover 7, so that heat on the heat dissipating fin 12 is conveniently dissipated to the outside.

This practical theory of operation: when the utility model is used, the PWM controller 1 is electrically connected with the MAX749 negative pressure conversion chip 3 through the DC-DC voltage reduction chip 2, and then the voltage is reduced and stabilized through the DC-DC voltage reduction chip 2, and the negative pressure is converted through the MAX749 negative pressure conversion chip 3, thereby improving the stability during conversion, facilitating the use, and when in use, the protection cover 7 is fixedly arranged outside the control main body 4, the outer surface of the protection cover 7 is coated with the shielding coating 8, further improving the shielding effect on the control main body 4, preventing external interference, facilitating the use, and the cooling liquid 10 is injected between the protection cover 7 and the silica gel waterproof membrane 9, facilitating the absorption of the heat emitted by the control main body 4, avoiding the heat accumulation and influencing the service life when the PWM controller 1 is used for a long time, and being provided with the heat radiation fins 12, facilitating the heat conduction in the cooling liquid 10 to the outside, further improve the radiating effect, and be equipped with water hole 13 and air passing hole 14 on radiating fin 12, improve the area of contact of coolant liquid 10 and fan hot fin 12 and the area of contact of outside air and fan hot fin 12, and then be convenient for in the outside air with heat on radiating fin 12 is spread fast.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications and variations can be made in the embodiments or in part of the technical features of the embodiments without departing from the spirit and the scope of the invention.

Claims

1. The utility model provides a PWM control negative pressure system, includes PWM controller (1), DC-DC step-down chip (2) and MAX749 negative pressure conversion chip (3), its characterized in that: PWM controller (1) passes through DC-DC step-down chip (2) electric connection MAX749 negative pressure conversion chip (3), just PWM controller (1) is including control main part (4), the equal fixed mounting in both sides of control main part (4) has end foot (5), PWM controller (1) passes through end foot (5) with DC-DC step-down chip (2) looks electric connection, just even fixed mounting has through-hole (6) on end foot (5).

2. The PWM-controlled negative pressure system according to claim 1, wherein: the upper end of the control main body (4) is sleeved with a protective cover (7), and the outer surface of the protective cover (7) is coated with a shielding coating (8).

3. The PWM-controlled negative pressure system according to claim 2, wherein: the outer surface of the control main body (4) is located inside of the protective cover (7) is fixedly provided with a silica gel waterproof membrane (9).

4. The PWM-controlled negative pressure system according to claim 3, wherein: protection casing (7) with it has coolant liquid (10) to pour into between silica gel water proof membrane (9), just the volume of coolant liquid (10) is less than protection casing (7) with volume between silica gel water proof membrane (9), protection casing (7) with gap (11) are left to upper end between silica gel water proof membrane (9).

5. The PWM controlled negative pressure system according to claim 4, wherein: the even fixed mounting of upper surface of protection casing (7) has radiating fin (12), just the one end of radiating fin (12) extends to the inside of protection casing (7), just the one end of radiating fin (12) with silica gel water proof membrane (9) contact.

6. The PWM controlled negative pressure system according to claim 5, wherein: the lower ends of the radiating fins (12) are uniformly provided with water through holes (13), and the cooling liquid (10) passes through the water through holes (13).

7. The PWM controlled negative pressure system according to claim 6, wherein: air passing holes (14) are uniformly formed in the upper ends of the radiating fins (12), and the air passing holes (14) are located in the upper end of the protective cover (7).