CN105262450B - The audio power amplifier circuit of in-vehicle navigation apparatus - Google Patents

The audio power amplifier circuit of in-vehicle navigation apparatus Download PDF

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Publication number
CN105262450B
CN105262450B CN201510682635.9A CN201510682635A CN105262450B CN 105262450 B CN105262450 B CN 105262450B CN 201510682635 A CN201510682635 A CN 201510682635A CN 105262450 B CN105262450 B CN 105262450B
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pins
resistance
electric capacity
tda7386
power amplification
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CN105262450A (en
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易春华
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Chongqing Yiji Technology Co., Ltd
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GOLDHONOR MOBILE ELECTRONICS Co Ltd
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/20—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers
    • H03F3/21—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only
    • H03F3/213—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers with semiconductor devices only in integrated circuits

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

The invention discloses a kind of audio power amplifier circuit of in-vehicle navigation apparatus, including power amplification process chip U29, some electric capacity, some resistance, some diodes and triode Q1；The audio power amplifier circuit of navigator, its power amplifier chip U29 four road input pins connect the relevant pins of the audio processing chip of audio frequency processing circuit, for receiving the audio signal of audio frequency processing circuit, and the audio signal received is amplified processing, after amplification, connected by the positive and negative port in four tunnels with loudspeaker.The structure of this circuit is simple, cost of manufacture is relatively low, its function only can be achieved by an amplification chip and electric capacity, resistance and triode, its stability is preferable.

Description

The audio power amplifier circuit of in-vehicle navigation apparatus
Technical field
The present invention relates to a kind of audio power amplifier circuit of in-vehicle navigation apparatus.
Background technology
Vehicle-mounted dvd navigation be it is a kind of played with DVD, play on-vehicle host based on MP4/MP3 and navigation feature, it one As be used for substituting the CD main frames of former car.If special train special designs, its attaching plug, sound wire will be completely right with former car Insert, do not change any circuit of former car, and outward appearance, size and former car style are unified.Have video input mouth can also install reversing additional Camera uses.In existing technology, the audio power amplifier circuit of vehicle mounted guidance is more unstable, the audio frequency effect handled out compared with Difference, and its structure is extremely complex, causes cost of manufacture higher.
The content of the invention
For above-mentioned the deficiencies in the prior art, the technical problems to be solved by the invention are：Provide it is a kind of it is simple in construction, The audio power amplifier circuit for the in-vehicle navigation apparatus that cost is relatively low and stability is higher.
In order to solve the above technical problems, one aspect of the present invention is：A kind of in-vehicle navigation apparatus is provided Audio power amplifier circuit, including power amplification process chip TDA7386, some electric capacity, some resistance, some diodes and three poles Pipe Q1；The power amplification process chip TDA7386 includes ST-BY pins, MUTE pins, IN1 pins, IN2 pins, IN3 and drawn Pin, IN4 pins, S-GND pins, AC-GND pins, SVR pins, HSD pins, TAB pins, OUT4 (-) pin, P-GND4 draw Pin, OUT4 (+) pin, OUT3 (-) pin, P-GND3 pins, OUT3 (+) pin, OUT2 (-) pin, P-GND2 pins, OUT2 (+) pin, OUT1 (-) pin, P-GND1 pins, OUT1 (+) pin, VCC2 pins, VCC1 pins；The power amplification processing Chip TDA7386 ST-BY pins pass sequentially through a resistance R172, a resistance R232 connects power supply A9V, the power amplification processing Chip TDA7386 ST-BY pins are also directly grounded by an electric capacity C11, the node between the resistance R172 and resistance 232 Also it is grounded by resistance R67；The MUTE pins of the power amplification process chip TDA7386 pass sequentially through a resistance R175, one Resistance R230 meets power supply A9V, the power amplification process chip TDA7386 and is also directly grounded by an electric capacity C23, the resistance Colelctor electrode of the node also with the triode Q1 between R175 and resistance R230 is connected, and the emitter stage of the triode Q1 connects Ground, also it is connected by an electric capacity C7 with base stage, the base stage of the triode Q1 also passes through a resistance R124 and diode D12 the moon Extremely be connected, the anode of the diode D12 connects the control chip of in-vehicle navigation apparatus, the negative electrode of the diode D12 with it is described Negative electrode of the node also with diode D1 between resistance R124 is connected, and anode and the control chip of the diode D1 connect Connect；The IN1 pins of the power amplification process chip TDA7386 pass sequentially through an electric capacity C6, a resistance R326 ground connection, the electricity Hold the node between C6 and resistance R326 also by the audio processing chip in a resistance R176 connection audio frequency processing circuits, it is described Node between resistance R176 and the electric capacity C6 is also grounded by an electric capacity C173；The resistance R176 and electric capacity C173 Between node also pass sequentially through a resistance R42, an electric capacity C33 and a resistance R138 connection control chips, the resistance R42 Node between the electric capacity C33 is also grounded by a resistance R139, the section between the electric capacity C33 and the resistance R139 Point passes sequentially through a resistance R123, the resistance R177 connections audio processing chip, the resistance R123 and resistance R177 Between node be grounded by an electric capacity C170, the node between the resistance R177 and the electric capacity C170 passes through an electric capacity C74 connects the IN2 pins of the power amplification process chip TDA7386, is also grounded by a resistance R336；At the power amplification Reason chip TDA7386 IN3 pins pass sequentially through an electric capacity C75, a resistance R337 ground connection, the electric capacity C75 and the resistance Node between R337 is connected by a resistance R178 with the audio processing chip, the resistance R178 and electric capacity C75 Between node be grounded by an electric capacity C171；The IN4 pins of the power amplification process chip TDA7386 pass sequentially through an electricity Hold C89, a resistance R338 ground connection, the node between the electric capacity C89 and the resistance R338 is grounded by an electric capacity C172, also It is connected by a resistance R179 with the audio processing chip；The S-GND pins of the power amplification process chip TDA7386 connect Ground, the AC-GND pins of the power amplification process chip TDA7386 are grounded by an electric capacity EC28, the power amplification processing Chip TDA7386 SVR pins are grounded by an electric capacity EC29, and the HSD pins of the power amplification process chip TDA7386 are empty Put, TAB pins, P-GND4 pins, P-GND3 pins, P-GND2 pins, the P- of the power amplification process chip TDA7386 GND1 pins are directly grounded, and OUT4 (-) pin of the power amplification process chip TDA7386 connects the negative pole of rear right horn, The OUT4 (+) of the power amplification process chip TDA7386 connects rear right horn positive pole, the power amplification process chip TDA7386 OUT3 (-) connects rear left horn negative pole, and the OUT3 (+) of the power amplification process chip TDA7386 connects rear left horn Positive pole, the OUT2 (-) of the power amplification process chip TDA7386 connect preceding right horn negative pole, the power amplification process chip Right horn positive pole, the OUT1 (-) of the power amplification process chip TDA7386 connect preceding left horn before TDA7386 OUT2 (+) connects Negative pole, the OUT1 (+) of the power amplification process chip TDA7386 connect preceding left horn positive pole；The power amplification process chip TDA7386 VCC2 pins are connected with the VCC1 pins with battery BATT, the power amplification process chip TDA7386's Node ground connection between VCC2 pins and the VCC1 pins.
As optimization, in addition to an electric capacity C123, the VCC2 pins of the power amplification process chip TDA7386 with it is described Node between VCC1 pins is grounded by the electric capacity C123.
It is in parallel as optimization, in addition to the electric capacity C123 of electric capacity an EC14, the electric capacity EC14.
The audio power amplifier circuit of the in-vehicle navigation apparatus of the present invention, its power amplifier chip TDA7386 four tunnels input are drawn Pin connects the relevant pins of the audio processing chip of audio frequency processing circuit, for receiving the audio signal of audio frequency processing circuit, and will The audio signal received is amplified processing, after amplification, is connected by the positive and negative port in four tunnels with loudspeaker.This circuit It is simple in construction, cost of manufacture is relatively low, only by an amplification chip and electric capacity, resistance and triode i.e. can be achieved its function, it Stability it is preferable.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the circuit theory diagrams of the audio power amplifier circuit of in-vehicle navigation apparatus of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made Embodiment, belong to the scope of protection of the invention.
Fig. 1 is referred to, Fig. 1 is the circuit theory diagrams of the audio power amplifier circuit of in-vehicle navigation apparatus of the present invention.The present embodiment If in-vehicle navigation apparatus audio power amplifier circuit include power amplification process chip TDA7386, some electric capacity, some resistance, Dry diode and triode Q1.
The power amplification process chip TDA7386 has ST-BY pins, MUTE pins, IN1 pins, IN2 pins, IN3 Pin, IN4 pins, S-GND pins, AC-GND pins, SVR pins, HSD pins, TAB pins, OUT4 (-) pin, P-GND4 Pin, OUT4 (+) pin, OUT3 (-) pin, P-GND3 pins, OUT3 (+) pin, OUT2 (-) pin, P-GND2 pins, OUT2 (+) pin, OUT1 (-) pin, P-GND1 pins, OUT1 (+) pin, VCC2 pins, VCC1 pins.Wherein：
The ST-BY pins of the power amplification process chip TDA7386 pass sequentially through a resistance R172 pins, a resistance The ST-BY pins that R232 meets power supply A9V, the power amplification process chip TDA7386 are also directly grounded by an electric capacity C11, Node between the resistance R172 and resistance 232 is also grounded by resistance R67.
The MUTE pins of the power amplification process chip TDA7386 pass sequentially through a resistance R175, a resistance R230 connects Power supply A9V, the power amplification process chip TDA7386 are also directly grounded by an electric capacity C23, the resistance R175 and resistance Colelctor electrode of the node also with the triode between R230 is connected, the grounded emitter of the triode Q1, also passes through an electricity Appearance is connected with C7 base stages, and the base stage of the triode Q1 is also connected by a resistance R124 with diode D12 negative electrode, and described two Pole pipe D12 anode connects the P-MUTE/PE5/SPI_NSS pins of the control chip of in-vehicle navigation apparatus, in-vehicle navigation apparatus Control chip uses model STM8 single-chip microcomputer, and the node between the negative electrode of the diode D12 and the resistance R124 is also It is connected with diode D1 negative electrode, the anode of the diode D1 is connected with the control chip.
The IN1 pins of the power amplification process chip TDA7386 pass sequentially through an electric capacity C6, a resistance R326 ground connection, Node between the electric capacity C6 and resistance R326 also passes through the audio frequency process core in a resistance R176 connection audio frequency processing circuits The LF pins of piece, the audio processing chip uses the chip of ZL3459 models, between the resistance R176 and the electric capacity C6 Node also pass through an electric capacity C173 ground connection；Node between the resistance R176 and the electric capacity C173 also passes sequentially through an electricity BEEP/PD4 (HS)/TIM2_CC2 pins connection of R42, an electric capacity C33 and a resistance R138 connection control chips is hindered, it is described Node between resistance R42 and the electric capacity C33 is also grounded by a resistance R139, the electric capacity C33 and resistance R139 Between node pass sequentially through a resistance R123, the RF pins of the resistance R177 connections audio processing chip, the resistance Node between R123 and the resistance R177 is grounded by an electric capacity C170, between the resistance 177 and the electric capacity C170 Node the IN2 pins of the power amplification process chip TDA7386 are connect by an electric capacity C74, also connect by a resistance R336 Ground.
The IN3 pins of the power amplification process chip TDA7386 pass sequentially through an electric capacity C75, a resistance R337 ground connection, The LR pin phases that node between the electric capacity C75 and the resistance R337 passes through a resistance R178 and the audio processing chip Even, the node between the resistance R178 and the electric capacity C75 is grounded by an electric capacity C171.
The IN4 pins of the power amplification process chip TDA7386 pass sequentially through an electric capacity C89, a resistance R338 ground connection, Node between the electric capacity C89 and the resistance R338 is grounded by an electric capacity C172, also by a resistance R179 with it is described The RR pins of audio processing chip are connected.
The S-GND pins ground connection of the power amplification process chip TDA7386.The power amplification process chip TDA7386 AC-GND pins are grounded by an electric capacity EC28.The SVR pins of the power amplification process chip TDA7386 lead to Cross electric capacity EC29 ground connection.The HSD pins of the power amplification process chip TDA7386 are vacant.The power amplification handles core Piece TDA7386 TAB pins, P-GND4 pins, P-GND3 pins, P-GND2 pins, P-GND1 pins is directly grounded.It is described Power amplification process chip TDA7386 OUT4 (-) pin connects the negative pole of rear right horn, the power amplification process chip TDA7386 OUT4 (+) connects rear right horn positive pole, and the OUT3 (-) of the power amplification process chip TDA7386 connects rear left horn Negative pole, the OUT3 (+) of the power amplification process chip TDA7386 connect rear left horn positive pole, the power amplification process chip Right horn negative pole, the OUT2 (+) of the power amplification process chip TDA7386 connect preceding right horn before TDA7386 OUT2 (-) connects Positive pole, the OUT1 (-) of the power amplification process chip TDA7386 connect preceding left horn negative pole, the power amplification process chip Left horn positive pole before TDA7386 OUT1 (+) connects.
The VCC2 pins of the power amplification process chip TDA7386 are connected with the VCC1 pins with battery BATT, Node between the VCC2 pins and the VCC1 pins of the power amplification process chip TDA7386 is connect by an electric capacity C123 Ground, an electric capacity EC14 are in parallel with the electric capacity C123.
The audio power amplifier circuit of the navigator of the present invention, its power amplifier chip TDA7386 four road input pins connect sound The relevant pins of the audio processing chip of frequency process circuit, for receiving the audio signal of audio frequency processing circuit, and it will receive Audio signal be amplified processing, after amplification, connected by the positive and negative port in four tunnels with loudspeaker.The structure letter of this circuit List, cost of manufacture are relatively low, only pass through an amplification chip and electric capacity, resistance and triode and its function, its stabilization can be achieved Property is preferable.
Embodiments of the present invention are these are only, are not intended to limit the scope of the invention, it is every to utilize the present invention The equivalent structure or equivalent flow conversion that specification and accompanying drawing content are made, or directly or indirectly it is used in other related technologies Field, it is included within the scope of the present invention.

Claims (1)

  1. A kind of 1. audio power amplifier circuit of in-vehicle navigation apparatus, it is characterised in that：Including power amplification process chip TDA7386, Some electric capacity, some resistance, some diodes and triode Q1；
    The power amplification process chip TDA7386 includes ST-BY pins, MUTE pins, IN1 pins, IN2 pins, IN3 and drawn Pin, IN4 pins, S-GND pins, AC-GND pins, SVR pins, HSD pins, TAB pins, OUT4 (-) pin, P-GND4 draw Pin, OUT4 (+) pin, OUT3 (-) pin, P-GND3 pins, OUT3 (+) pin, OUT2 (-) pin, P-GND2 pins, OUT2 (+) pin, OUT1 (-) pin, P-GND1 pins, OUT1 (+) pin, VCC2 pins, VCC1 pins；
    The ST-BY pins of the power amplification process chip TDA7386 pass sequentially through a resistance R172, a resistance R232 connects power supply A9V, the power amplification process chip TDA7386 ST-BY pins are also directly grounded by an electric capacity C11, the resistance Node between R172 and resistance 232 is also grounded by resistance R67；
    The MUTE pins of the power amplification process chip TDA7386 pass sequentially through a resistance R175, a resistance R230 connects power supply A9V, the power amplification process chip TDA7386 are also directly grounded by an electric capacity C23, the resistance R175 and resistance R230 Between colelctor electrode of the node also with the triode Q1 be connected, the grounded emitter of the triode Q1, also pass through an electric capacity C7 is connected with base stage, and the base stage of the triode Q1 is also connected by a resistance R124 with diode D12 negative electrode, two pole Pipe D12 anode connects the control chip of in-vehicle navigation apparatus, the section between the negative electrode of the diode D12 and the resistance R124 Negative electrode of the point also with diode D1 is connected, and the anode of the diode D1 is connected with the control chip；
    The IN1 pins of the power amplification process chip TDA7386 pass sequentially through an electric capacity C6, a resistance R326 ground connection, described Node between electric capacity C6 and resistance R326 also passes through the audio processing chip in a resistance R176 connection audio frequency processing circuits, institute The node stated between resistance R176 and the electric capacity C6 is also grounded by an electric capacity C173；The resistance R176 and the electric capacity Node between C173 also passes sequentially through a resistance R42, an electric capacity C33 and a resistance R138 connection control chips, the electricity The node hindered between the R42 and electric capacity C33 is also grounded by a resistance R139, the electric capacity C33 and the resistance R139 it Between node pass sequentially through a resistance R123, the resistance R177 connections audio processing chip, the resistance R123 and the electricity Node between resistance R177 is grounded by an electric capacity C170, and the node between the resistance R177 and the electric capacity C170 passes through one Electric capacity C74 connects the IN2 pins of the power amplification process chip TDA7386, is also grounded by a resistance R336；
    The IN3 pins of the power amplification process chip TDA7386 pass sequentially through an electric capacity C75, a resistance R337 ground connection, described Node between electric capacity C75 and the resistance R337 is connected by a resistance R178 with the audio processing chip, the resistance Node between R178 and the electric capacity C75 is grounded by an electric capacity C171；
    The IN4 pins of the power amplification process chip TDA7386 pass sequentially through an electric capacity C89, a resistance R338 ground connection, described Node between electric capacity C89 and the resistance R338 is grounded by an electric capacity C172, also passes through a resistance R179 and the audio Process chip is connected；
    The S-GND pins ground connection of the power amplification process chip TDA7386, the power amplification process chip TDA7386's AC-GND pins are grounded by an electric capacity EC28, and the SVR pins of the power amplification process chip TDA7386 pass through an electric capacity EC29 is grounded, and the HSD pins of the power amplification process chip TDA7386 are vacant, the power amplification process chip TDA7386 TAB pins, P-GND4 pins, P-GND3 pins, P-GND2 pins, P-GND1 pins be directly grounded, the power amplification Process chip TDA7386 OUT4 (-) pin connects the negative pole of rear right horn, the power amplification process chip TDA7386's OUT4 (+) connects rear right horn positive pole, and the OUT3 (-) of the power amplification process chip TDA7386 connects rear left horn negative pole, described Power amplification process chip TDA7386 OUT3 (+) connects rear left horn positive pole, the power amplification process chip TDA7386's Right horn negative pole before OUT2 (-) connects, the OUT2 (+) of the power amplification process chip TDA7386 connects preceding right horn positive pole, described Left horn negative pole before power amplification process chip TDA7386 OUT1 (-) connects, the power amplification process chip TDA7386's Left horn positive pole before OUT1 (+) connects；
    The VCC2 pins of the power amplification process chip TDA7386 are connected with the VCC1 pins with battery BATT, described Node ground connection between power amplification process chip TDA7386 VCC2 pins and the VCC1 pins；
    Also between VCC2 pins and the VCC1 pins including electric capacity a C123, the power amplification process chip TDA7386 Node be grounded by the electric capacity C123；
    Also the electric capacity C123 including electric capacity an EC14, the electric capacity EC14 is in parallel.
CN201510682635.9A 2015-10-21 2015-10-21 The audio power amplifier circuit of in-vehicle navigation apparatus Active CN105262450B (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201450488U (en) * 2009-08-10 2010-05-05 陈遇浩 Power amplification circuit of automobile sound box
CN205092830U (en) * 2015-10-21 2016-03-16 重庆金宏汽车电子有限公司 Vehicle automatic navigator's audio power amplifier circuit

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104582346B (en) * 2013-10-18 2017-09-22 神讯电脑(昆山)有限公司 The water door component of electronic installation

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN201450488U (en) * 2009-08-10 2010-05-05 陈遇浩 Power amplification circuit of automobile sound box
CN205092830U (en) * 2015-10-21 2016-03-16 重庆金宏汽车电子有限公司 Vehicle automatic navigator's audio power amplifier circuit

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Effective date of registration: 20200623

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