CN219394696U

CN219394696U - Boost type power supply circuit and PCB

Info

Publication number: CN219394696U
Application number: CN202223328042.7U
Authority: CN
Inventors: 曾迎春; 李于聪; 朱敏; 简和兵; 邓意峰; 温学斌; 杨彩芳; 严波
Original assignee: Chengdu Jinnuoxin High Tech Co ltd
Current assignee: Chengdu Jinnuoxin High Tech Co ltd
Priority date: 2022-12-13
Filing date: 2022-12-13
Publication date: 2023-07-21
Anticipated expiration: 2032-12-13

Abstract

The utility model discloses a boosting type power supply circuit and a PCB (printed circuit board), and belongs to the technical field of circuit design. The boosting power supply circuit comprises a boosting chip, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, a first resistor, a second resistor, a fourth resistor, a ninth resistor, a first inductor, a first diode and a second diode. The utility model simplifies the peripheral circuits in the power supply circuit and greatly saves the space of the PCB.

Description

Boost type power supply circuit and PCB

Technical Field

The utility model belongs to the technical field of circuit design, and particularly relates to a boosting type power supply circuit and a PCB.

Background

DC-DC refers to a direct current to direct current power supply, which is a device for converting one voltage value in a direct current circuit into another voltage value, and is also called a switching power supply or a switching regulator. The DC-DC converter generally comprises a control chip, an inductor, a diode, a capacitor, a triode and the like, and the use of the DC-DC converter is beneficial to simplifying the design of a power circuit and improving the performance index. The method is widely applied to the fields of power electronics, military industry, scientific research, industrial control equipment, communication equipment, instruments and meters, mobile communication, industrial control, automobile electronics, aerospace and the like. The circuit structure of many existing boost power supply circuits is complex, and occupies a large space of a PCB. Meanwhile, the PCB layout scheme of the existing partial power supply circuit can cause larger noise and influence the quality of output signals.

Disclosure of Invention

The utility model aims to overcome the defects of the prior art and provides a boosting type power supply circuit and a PCB.

The aim of the utility model is realized by the following technical scheme:

according to a first aspect of the present utility model, a boost power supply circuit includes a boost chip, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, a first resistor, a second resistor, a fourth resistor, a ninth resistor, a first inductor, a first diode, and a second diode;

the IN pin of the boosting chip is used for being connected with an input power supply, the IN pin of the boosting chip is grounded through a fifth capacitor, both the sixth capacitor and the seventh capacitor are connected IN parallel with the fifth capacitor, and the IN pin of the boosting chip is connected with the LX1 pin of the boosting chip through a first inductor;

the EN pin of the boosting chip is grounded through a first resistor, and is connected with the IN pin of the boosting chip;

the LX1 pin of the boost chip is connected with the LX2 pin of the boost chip, the LX1 pin of the boost chip is connected with the anode of a first diode, the cathode of the first diode is used for connecting power supply voltage, the cathode of the first diode is grounded through a first capacitor, and the second capacitor, a third capacitor and a fourth capacitor are all connected in parallel with the first capacitor;

the FB pin of the boost chip is connected with the first end of the ninth resistor, the second end of the ninth resistor is grounded, and the first end of the ninth resistor is connected with the cathode of the first diode through the fourth resistor;

and the anode of the second diode is connected with the cathode of the first diode through a second resistor, and the cathode of the second diode is grounded.

Further, the model of the boost chip is SY7304DBC.

Further, the second diode is a light emitting diode.

Further, the inductance value of the first inductor is 2.2uH.

According to a second aspect of the present utility model, a PCB board comprises a PCB body on which the boost power circuit according to the first aspect of the present utility model is arranged.

Further, among the fifth capacitor, the sixth capacitor and the seventh capacitor, the capacitor with smaller capacitance value is closer to the IN pin of the boost chip.

Further, among the first capacitor, the second capacitor, the third capacitor and the fourth capacitor, the capacitor with larger capacitance value is closer to the LX1 pin of the boost chip, and the capacitor with larger capacitance value is closer to the LX2 pin of the boost chip.

Further, the grounding ends of the first capacitor, the second capacitor, the third capacitor, the fourth capacitor, the fifth capacitor, the sixth capacitor and the seventh capacitor are all provided with a plurality of grounding holes.

The beneficial effects of the utility model are as follows:

(1) The utility model simplifies the peripheral circuits in the power supply circuit, and greatly saves the space of the PCB;

(2) The inductance value of the first inductor is 2.2uH, and current fluctuation in the inductor is reduced under the condition that the allowance of temperature rise and saturation current is met;

(3) The small capacitance at the input side is close to the input pin, so that parasitic inductance is reduced;

(4) The output side large capacitor is close to the output pin, so that the situation that ripple current exceeds a rated value due to the fact that the small capacitor is close to the output pin is avoided;

(5) According to the utility model, the ground hole is arranged at the grounding end of the capacitor, so that parasitic resistance can be reduced, and meanwhile, heat dissipation capacity is increased.

Drawings

FIG. 1 is a schematic diagram of a boost power circuit according to the present utility model;

fig. 2 is a schematic structural view of a PCB board according to the present utility model;

in the figure, 1-PCB body, 2-ground hole.

Detailed Description

The technical solutions of the present utility model will be clearly and completely described below with reference to the embodiments, and it is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by a person skilled in the art without any inventive effort, are intended to be within the scope of the present utility model, based on the embodiments of the present utility model.

Referring to fig. 1-2, the present embodiment provides a boost power circuit and a PCB board:

a first aspect of the present utility model provides a boost power supply circuit. As shown in fig. 1, the boost power supply circuit includes a boost chip U1, a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a sixth capacitor C6, a seventh capacitor C7, a first resistor R1, a second resistor R2, a fourth resistor R4, a ninth resistor R9, a first inductor L1, a first diode V1, and a second diode V2. In some embodiments, the boost chip U1 is model SY7304DBC, the first diode V1 is model LMBR340FT1G, and the second diode V2 is model S170PGC-G5-1AG; the capacitance value of the first capacitor C1 is 0.1uF, the capacitance value of the second capacitor C2 is 10uF, the capacitance value of the third capacitor C3 is 10uF, the capacitance value of the fourth capacitor C4 is 22uF, the capacitance value of the fifth capacitor C5 is 22uF, the capacitance value of the sixth capacitor C6 is 22uF, and the capacitance value of the seventh capacitor C7 is 0.1uF; the resistance of the first resistor R1 is 1MΩ, the resistance of the second resistor R2 is 2.2kΩ, the resistance of the fourth resistor R4 is 200kΩ, and the resistance of the ninth resistor R9 is 9.1kΩ; the inductance value of the first inductor L1 is 2.2uH.

The IN pin of the boost chip U1 is used for being connected with an input power supply, the IN pin of the boost chip U1 is connected with the first end of a fifth capacitor C5, the second end of the fifth capacitor C5 is grounded, a sixth capacitor C6 is connected with the fifth capacitor C5 IN parallel, a seventh capacitor C7 is connected with the fifth capacitor C5 IN parallel, the IN pin of the boost chip U1 is connected with the first end of a first inductor L1, and the second end of the first inductor L1 is connected with the LX1 pin of the boost chip U1.

The EN pin of the boost chip U1 is connected with the first end of the first resistor R1, the second end of the first resistor R1 is grounded, and the EN pin of the boost chip U1 is connected with the IN pin of the boost chip U1.

The LX1 pin of the boost chip U1 is connected with the LX2 pin of the boost chip, the LX1 pin of the boost chip U1 is connected with the anode of a first diode V1, the cathode of the first diode V1 is used for being connected with power supply voltage, the cathode of the first diode V1 is connected with the first end of a first capacitor C1, the second end of the first capacitor C1 is grounded, a second capacitor C2 is connected with the first capacitor in parallel, a third capacitor C3 is connected with the first capacitor C1 in parallel, and a fourth capacitor C4 is connected with the first capacitor C1 in parallel.

The FB pin of the boost chip U1 is connected with the first end of a ninth resistor R9, the second end of the ninth resistor R9 is grounded, the first end of the ninth resistor R9 is connected with the first end of a fourth resistor R4, and the second end of the fourth resistor R4 is connected with the cathode of a first diode V1.

The anode of the second diode V2 is connected with the first end of the second resistor R2, the second end of the second resistor R2 is connected with the cathode of the first diode V1, and the cathode of the second diode V2 is grounded.

In some embodiments, the second diode V2 is a light emitting diode.

In the embodiment, the boost chip U1 adopts a SY7304DBC chip, a 120mΩ low RDSn channel MOSFET is integrated in the SY7304DBC chip, the efficiency is high, the fixed 1MHz switching frequency and internal compensation reduce the number and the size of external components, and the built-in soft start reduces the inrush current during starting. Under the condition that the allowance of temperature rise and saturation current is met, the embodiment selects an inductance of 2.2uH, reduces current fluctuation in the inductance, and reduces ripple by adopting capacitances of 10uf and 22 uf. The embodiment simplifies peripheral circuits as much as possible, and greatly saves PCB space.

The second aspect of the present utility model provides a PCB board. As shown in fig. 2, the PCB board includes a PCB body 1, and the boost power circuit according to the first aspect of the present utility model is disposed on the PCB body 1.

IN some embodiments, among the fifth capacitor C5, the sixth capacitor C6, and the seventh capacitor C7, the smaller the capacitance value, the closer to the IN pin of the boost chip U1. By placing a small one of the input capacitances close to the input pin, parasitic inductance is reduced in these embodiments.

In some embodiments, among the first capacitor C1, the second capacitor C2, the third capacitor C3, and the fourth capacitor C4, the larger the capacitance value is, the closer the larger the capacitance value is to the LX1 pin of the boost chip U1, and the larger the capacitance value is, the closer the capacitance value is to the LX2 pin of the boost chip U1. By bringing the large one of the output capacitors close to the output pin, the situation that the ripple current of the small one exceeds the rated value is avoided in these embodiments.

In some embodiments, the grounding terminals of the first capacitor C1, the second capacitor C2, the third capacitor C3, the fourth capacitor C4, the fifth capacitor C5, the sixth capacitor C6 and the seventh capacitor C7 are all provided with a plurality of ground holes 2. The ground hole 2 is arranged at the grounding end of the capacitor to reduce impedance because the noise caused by parasitic inductance can greatly influence the discontinuity of the input power supply. In general, one ground hole 2 has the overcurrent capacity of 1A, the overcurrent can be increased by punching the ground holes 2, the copper sheet area can be increased, and the heat dissipation capacity can be increased by adding the ground holes 2; at the same time, more ground holes 2 help to reduce parasitic resistance.

The foregoing is merely a preferred embodiment of the utility model, and it is to be understood that the utility model is not limited to the form disclosed herein but is not to be construed as excluding other embodiments, but is capable of numerous other combinations, modifications and environments and is capable of modifications within the scope of the inventive concept, either as taught or as a matter of routine skill or knowledge in the relevant art. And that modifications and variations which do not depart from the spirit and scope of the utility model are intended to be within the scope of the appended claims.

Claims

1. The boost power supply circuit is characterized by comprising a boost chip, a first capacitor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a sixth capacitor, a seventh capacitor, a first resistor, a second resistor, a fourth resistor, a ninth resistor, a first inductor, a first diode and a second diode;

2. The boost power supply circuit of claim 1, wherein the boost chip is of the type SY7304DBC.

3. The boost power supply circuit of claim 1, wherein the second diode is a light emitting diode.

4. The boost power supply circuit of claim 1, wherein the first inductor has an inductance value of 2.2uH.

5. A PCB board, comprising a PCB body, the PCB body being provided with a boost power circuit according to any one of claims 1-4.

6. The PCB of claim 5, wherein among the fifth, sixth and seventh capacitors, the smaller the capacitance value is, the closer the capacitor is to the IN pin of the boost chip.

7. The PCB of claim 5, wherein among the first, second, third, and fourth capacitors, a larger capacitance is closer to the LX1 pin of the boost chip and a larger capacitance is closer to the LX2 pin of the boost chip.

8. The PCB of claim 5, wherein the grounding terminals of the first, second, third, fourth, fifth, sixth and seventh capacitors are each provided with a plurality of ground holes.