Buffer isolation type power supply circuit and power supply protection structure

Abstract

The utility model belongs to the technical field of audio equipment, and particularly relates to a buffer isolation type power supply circuit which is used for power supply voltage stabilization and comprises a VCC access voltage end, a VD output voltage end, a TMI3113 chip, a diode D6 and a polar capacitor C31. The VCC access voltage end is connected with the input end of the diode D6, and the output end of the diode D6 is connected with the fourth pin and the first pin of the TMI3113 chip; the input end of the polar capacitor C31 is connected with the output end of the diode D6, and the output end of the polar capacitor C31 is grounded. Before the power amplifier chip is started, the high-capacity capacitor C31 stores electric energy through charging, and when the power amplifier chip is started, the capacitor C31 rapidly discharges outwards to provide stable power supply voltage for the main control CPU, so that electromagnetic interference generated at the moment of starting of the power amplifier chip is effectively isolated.

Description

TECHNICAL FIELD

[0001] The utility model belongs to audio equipment technical field especially, it is related to a buffer isolation type power supply circuit and power protection structure. BACKGROUND

[0002] With the continuous development of audio technology, the lyric speaker with liquid crystal display is widely welcomed because of its fashionable appearance and multifunctionality. This kind of speaker usually integrates WIFI and Bluetooth functions, providing users with convenient wireless connection and lyric display services. However, in the moment of power amplifier chip starting, due to the need for large power to drive the loudspeaker, it often produces strong electromagnetic interference to the main control CPU, affecting the normal work of the speaker and user experience. SUMMARY

[0003] The utility model discloses a buffer isolation type power supply circuit and power protection structure, aim at solving the technical problem of above in prior art.

[0004] To achieve the above purpose, the utility model embodiment provides a buffer isolation type power supply circuit for power supply voltage stabilization, comprising VCC access voltage end, VD output voltage end, TMI3113 chip, diode D6 and polarity capacitor C31;The input end of VCC access voltage end is connected with the input end of diode D6, and the output end of diode D6 is connected with the fourth pin and the first pin of TMI3113 chip;The input end of polarity capacitor C31 is connected with the output end of diode D6, and the output end of polarity capacitor C31 is grounded.

[0005] Further, the buffer isolation type power supply circuit further comprises polarity capacitor C4, capacitor C5, resistance R17, magnetic core inductance L1, capacitor C2, resistance R18, resistance R21, capacitor C6, capacitor C7 and polarity capacitor C8;The input end of magnetic core inductance L1D is connected with the third pin of TMI3113 chip, and the output end of magnetic core inductance L1 is connected with VD output voltage end;The input end of capacitor C2 and resistance R18 and resistance R21 is connected with the fifth pin of TMI3113 chip in parallel, and the output end of capacitor C2 and resistance R18 is connected with VD output voltage end in parallel;The output end of resistance R21 is grounded.

[0006] Further, the input end of polarity capacitor C4 and capacitor C5 is connected with VCC access voltage end and the fourth pin of TMI3113 chip in parallel respectively;The input end of capacitor C6, capacitor C7 and capacitor C8 is connected with the third pin of TMI3113 chip and VD output voltage end in parallel;The output end of capacitor C6, capacitor C7 and capacitor C8 is grounded.

[0007] Further, the buffer isolation type power supply circuit further comprises a VCC power supply circuit, the VCC power supply circuit comprising an NPN triode Q5, a switch control end, a jog trigger end and a VCC access voltage end, the switch control end being connected to the base of the triode Q5, one end of the jog trigger end being connected to the collector of the triode Q5, and the other end being connected to the VCC access voltage end.

[0008] Further, the VCC power supply circuit further comprises a resistor R35, a resistor R32, a capacitor C19 and a capacitor C20, the resistor R35 being arranged between the switch control end and the base of the triode Q5, one end of the resistor R32 being connected to the collector of the triode Q5, and the other end being connected to the jog trigger end; the VCC access voltage end being connected to the capacitor C19 and the capacitor C20 in parallel; the other ends of the capacitor C19 and the capacitor C20 being grounded.

[0009] Further, a buffer isolation type power supply protection structure comprises a power supply body, a liquid crystal display screen, a communication module, a main control CPU, a power amplifier chip and a buffer isolation type power supply circuit, the main control CPU being connected in the buffer isolation type power supply circuit, the power supply body being connected to the power amplifier chip and the buffer isolation type power supply circuit, an output end of the buffer isolation type power supply circuit being connected to the main control CPU, and the liquid crystal display screen being connected to the main control CPU through the communication module.

[0010] The buffer isolation type power supply circuit provided by the embodiment of the utility model has one or more of the above technical solutions at least with the following technical effects:

[0011] In the design, the buffer isolation type power supply circuit is composed of a large-capacity capacitor C31 and related circuits, and is connected between the main control CPU and the power supply, for providing stable power supply voltage at the starting moment of the power amplifier chip and preventing interference. Before the power amplifier chip starts, the large-capacity capacitor C31 stores electric energy through charging, and when the power amplifier chip starts, the capacitor C31 rapidly discharges to the outside to provide stable power supply voltage for the main control CPU, thereby effectively isolating electromagnetic interference generated at the starting moment of the power amplifier chip. The diode D6 plays a role of unidirectional conduction, ensures that the current can only flow in one direction, and thereby protects the subsequent circuit from reverse voltage. The TMI3113 chip plays a role of voltage regulation and isolation here, and ensures that the main control CPU obtains stable and undisturbed power supply. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the utility model, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the utility model, and other drawings can be obtained by those skilled in the art without creative labor under the premise of the drawings.

[0013] Fig. 1 A circuit diagram of the buffer isolation type power supply circuit provided by the embodiment of the utility model;

[0014] Fig. 2 A circuit diagram of the VCC power supply circuit provided by the embodiment of the utility model;

[0015] Fig. 3 A structure diagram of the buffer isolation type power supply protection structure provided by the embodiment of the utility model.

[0016] In the drawings, various reference signs refer to:

[0017] 100, liquid crystal display screen; 110, communication module; 120, power supply body; 130, main control CPU; 140, power amplifier chip;

[0018] 200, buffer isolation type power supply circuit; 210, VCC access voltage end; 220, VD output voltage end; 230, TMI3113 chip; 240, resistor R18; 266, resistor R21; 267, capacitor C6; 268, capacitor C7; 269, polarity capacitor C8;

[0019] 300, VCC power supply circuit; 310, switch control end; 320, jog trigger end. DETAILED DESCRIPTION

[0020] The embodiments of the utility model will be described in detail below, examples of the embodiments are shown in the 1-3 drawings, wherein the same or similar reference signs represent the same or similar elements or elements with the same or similar functions throughout. The following will be described by referring to the drawings Figs. 1-3 The described embodiments are exemplary and are intended to explain the embodiments of the utility model, and cannot be understood as a limitation of the utility model.

[0021] In the description of the embodiments of the utility model, it is understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the utility model.

[0022] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the embodiments of the utility model, the meaning of "multiple" is two or more than two, unless otherwise explicitly specified and limited.

[0023] In the embodiments of the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and other terms should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the communication inside two elements or the interaction relationship of two elements. For ordinary skilled in the art, the specific meaning of the above terms in the embodiments of the utility model can be understood according to the specific circumstances.

[0024] In an embodiment of the utility model, a buffer isolation type power supply circuit is provided for power supply voltage stabilization, comprising a VCC access voltage end 210, a VD output voltage end 220, a TMI3113 chip 230, a diode D6 and a polarity capacitor C31; the input end of the VCC access voltage end 210 is connected with the input end of the diode D6, the output end of the diode D6 is connected with the fourth pin and the first pin of the TMI3113 chip 230; the input end of the polarity capacitor C31 is connected with the output end of the diode D6, and the output end of the polarity capacitor C31 is grounded.

[0025] Specifically, the buffer isolation type power supply circuit is composed of a large-capacity capacitor C31 and related circuits, connected between the main control CPU 130 and the power supply, for providing stable power supply voltage at the starting moment of the power amplifier chip 140 to prevent interference. Before the power amplifier chip 140 starts, the large-capacity capacitor C31 stores electrical energy by charging, and when the power amplifier chip 140 starts, the capacitor C31 quickly discharges to provide stable power supply voltage for the main control CPU 130, thereby effectively isolating the electromagnetic interference generated at the starting moment of the power amplifier chip 140. The diode D6 plays a role of one-way conduction, ensuring that the current can only flow in one direction, thereby protecting the subsequent circuit from the influence of reverse voltage. The TMI3113 chip 230 is a current mode step-down converter, which plays a role of voltage regulation and isolation here, ensuring that the main control CPU 130 obtains stable and undisturbed power supply. C31 adopts a 2200uF large-capacity capacitor to ensure the stability of VD3.3V. The buffer isolation type power supply circuit 200 of the utility model has simple structure and is easy to implement, which reduces the manufacturing cost of the sound box.

[0026] Further, the buffer isolation power supply circuit further comprises a polar capacitor C4, a capacitor C5, a resistor R17, a magnetic core inductor L1, a capacitor C2, a resistor R18, a resistor R21266, a capacitor C6267, a capacitor C7268, and a polar capacitor C8269; a third pin of the TMI3113 chip 230 is connected to an input end of the magnetic core inductor L1D, an output end of the magnetic core inductor L1 is connected to the VD output voltage end 220, a fifth pin of the TMI3113 chip 230 is connected in parallel to input ends of the capacitor C2, the resistor R18, and the resistor R21266, output ends of the capacitor C2 and the resistor R18 are connected in parallel to the VD output voltage end 220, and an output end of the resistor R21266 is grounded. Input ends of the polar capacitor C4 and the capacitor C5 are connected in parallel to the VCC access voltage end 210 and a fourth pin of the TMI3113 chip 230, respectively; input ends of the capacitor C6267, the capacitor C7268, and the capacitor C8 are connected in parallel to the third pin of the TMI3113 chip 230 and the VD output voltage end 220; and output ends of the capacitor C6267, the capacitor C7268, and the capacitor C8 are grounded. Specifically, when the power supply body provides a voltage, the voltage is filtered through the diode D6 and the polar capacitor C31 and then enters the TMI3113 chip 230 for voltage regulation. The magnetic core inductor L1 and the newly added filtering elements (such as the polar capacitor C4, the capacitor C5, etc.) together form a more complex filtering network to further smooth the output voltage. The capacitor C2, the resistor R18, the resistor R21266, and the capacitor C6267, the capacitor C7268, the capacitor C8, and other elements form an electromagnetic interference suppression network to reduce electromagnetic radiation and interference. Finally, the stable voltage filtered and regulated is provided to the main control CPU 130 through the VD output voltage end 220.

[0027] Further, the buffer isolation power supply circuit further comprises a VCC power supply circuit 300, which comprises an NPN triode Q5, a switch control end 310, a jog trigger end 320, and a VCC access voltage end 210. The switch control end 310 is connected to a base of the triode Q5, one end of the jog trigger end 320 is connected to a collector of the triode Q5, and the other end is connected to the VCC access voltage end 210. Specifically, when the switch control end 310 receives a high-level signal, the triode Q5 is turned on, the VCC access voltage end 210 is connected to the subsequent circuit (such as the TMI3113 chip 230, etc.) through the triode Q5, and stable power supply is provided for the circuit. When the switch control end 310 receives a low-level signal, the triode Q5 is turned off, the VCC access voltage end 210 is disconnected from the subsequent circuit, and the circuit enters a power-off state. The design of the jog trigger end 320 allows the user to control the connection between the collector of the triode Q5 and the VCC access voltage end 210 by triggering a continuous action through a brief jog.

[0028] Further, the VCC power supply circuit 300 further includes a resistor R35, a resistor R32, a capacitor C19, and a capacitor C20. The resistor R35 is arranged between the switch control end 310 and the base of the triode Q5. One end of the resistor R32 is connected to the collector of the triode Q5, and the other end is connected to the point-on trigger end 320. The VCC access voltage end 210 is also connected in parallel with the capacitor C19 and the capacitor C20. The other ends of the capacitor C19 and the capacitor C20 are grounded. Specifically, when the switch control end 310 receives a high-level signal, the triode Q5 is turned on after current limiting by the resistor R35, the VCC access voltage end 210 is connected to the subsequent circuit through the triode Q5, and stable power supply is provided for the circuit. When the switch control end 310 receives a low-level signal, the triode Q5 is cut off, the VCC access voltage end 210 is disconnected from the subsequent circuit, and the circuit enters a power-off state. The capacitor C19 and the capacitor C20 are connected in parallel at the VCC access voltage end 210, which plays a role in filtering and decoupling, and provides a more stable and clean direct current voltage for the circuit.

[0029] A buffer isolation type power supply protection structure includes a power supply body 120, a liquid crystal display screen 100, a communication module 110, a main control CPU 130, a power amplifier chip 140, and a buffer isolation type power supply circuit 200. The main control CPU 130 is connected to the buffer isolation type power supply circuit 200. The power supply body 120 is connected to the power amplifier chip 140 and the buffer isolation type power supply circuit 200. The output end of the buffer isolation type power supply circuit 200 is connected to the main control CPU 130. The liquid crystal display screen 100 is connected to the main control CPU 130 through the communication module 110. Specifically, the liquid crystal display screen 100 is used to display lyrics and sound box state information. The communication module 110 includes WIFI and Bluetooth modules, provides wireless connection function, and supports user control of the sound box through mobile devices. The power amplifier chip 140 is responsible for amplifying audio signals and driving speakers to produce sound. The main control CPU 130 is responsible for overall control and data processing of the sound box. The buffer isolation type power supply circuit 200 is as above. Before the power amplifier chip 140 starts, a large-capacity capacitor stores electrical energy through charging. When the power amplifier chip 140 starts, the capacitor quickly discharges to provide stable power voltage for the main control CPU 130, thereby effectively isolating electromagnetic interference generated during the start of the power amplifier chip 140. The capacity of the large-capacity capacitor can be selected and adjusted according to the power demand of the power amplifier chip 140 and the interference bearing capacity of the main control CPU 130 to ensure the best buffer isolation effect. At the same time, the buffer isolation type power supply circuit 200 can be integrated with other circuit modules of the sound box to form a compact and efficient power management system. Through the innovative buffer isolation technology, the interference problem of the power amplifier chip 140 to the main control CPU 130 during the start of the power amplifier chip 140 is effectively solved, and the stability and reliability of the sound box are improved. The implementation of this technology will bring new development opportunities to the audio equipment field and significant economic and social benefits to the related industries.

[0030] The above merely describes preferred embodiments of the present application and is not intended to limit the present application, and any modification, equivalent replacement, and improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A buffered isolation power supply circuit, connected between the power supply body and the main control CPU (130), used for power supply voltage regulation, characterized in that, It includes a VCC input voltage terminal (210), a VD output voltage terminal (220), a TMI3113 chip (230), a diode D6, and a polarized capacitor C31; one end of the VCC input voltage terminal (210) is connected to the main power supply body, and the other end is connected to the input terminal of the diode D6. The output terminal of the diode D6 is connected to the fourth pin and the first pin of the TMI3113 chip (230); the input terminal of the polarized capacitor C31 is connected to the output terminal of the diode D6, and the output terminal of the polarized capacitor C31 is grounded. The third pin of the TMI3113 chip (230) is connected to one end of the VD output voltage terminal (220), and the other end is connected to the main control CPU (130).

2. The buffered isolation power supply circuit according to claim 1, characterized in that, It also includes polarized capacitor C4, capacitor C5, resistor R17, magnetic core inductor L1, capacitor C2, resistor R18, resistor R21 (266), capacitor C6 (267), capacitor C7 (268), and polarized capacitor C8 (269); the third pin of the TMI3113 chip (230) is connected to the input terminal of the magnetic core inductor L1D, the output terminal of the magnetic core inductor L1 is connected to the VD output voltage terminal (220), the fifth pin of the TMI3113 chip (230) is connected in parallel with the input terminals of capacitor C2, resistor R18, and resistor R21 (266), the output terminals of capacitor C2 and resistor R18 are connected in parallel to the VD output voltage terminal (220); the output terminal of resistor R21 (266) is grounded.

3. The buffered isolation power supply circuit according to claim 2, characterized in that, The input terminals of the polarized capacitor C4 and the capacitor C5 are connected in parallel to the VCC input voltage terminal (210) and the fourth pin of the TMI3113 chip (230), respectively; the input terminals of the capacitors C6 (267), C7 (268) and C8 are connected in parallel to the third pin of the TMI3113 chip (230) and the VD output voltage terminal (220); the output terminals of the capacitors C6 (267), C7 (268) and C8 are grounded.

4. The buffered isolation power supply circuit according to claim 1, characterized in that, It also includes a VCC power supply circuit (300), which includes an NPN transistor Q5, a switch control terminal (310), a jog trigger terminal (320), and the VCC access voltage terminal (210). The switch control terminal (310) is connected to the base of the transistor Q5, and one end of the jog trigger terminal (320) is connected to the collector of the transistor Q5, and the other end is connected to the VCC access voltage terminal (210).

5. The buffered isolation power supply circuit according to claim 4, characterized in that, The VCC power supply circuit (300) also includes resistors R35 and R32, capacitor C19 and capacitor C20. Resistor R35 is located between the switch control terminal (310) and the base of transistor Q5. One end of resistor R32 is connected to the collector of transistor Q5, and the other end is connected to the jog trigger terminal (320). The VCC input voltage terminal (210) is also connected in parallel with capacitors C19 and C20 respectively. The other ends of capacitors C19 and C20 are grounded.

6. A buffered isolation power supply protection structure, comprising the buffered isolation power supply circuit as described in any one of claims 1-5, characterized in that, It also includes an LCD screen (100), a communication module (110), a power supply unit (120), a main control CPU (130), and a power amplifier chip (140). The main control CPU (130) is connected to the buffered isolation power supply circuit (200). The power supply unit (120) is connected to the power amplifier chip (140) and the buffered isolation power supply circuit (200). The output terminal of the buffered isolation power supply circuit (200) is connected to the main control CPU (130). The LCD screen (100) and the main control CPU (130) are connected through the communication module (110).

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