CN208063161U - A kind of power amplification output circuit EMC interference ultra-wideband filter - Google Patents

Abstract

The utility model discloses a kind of power amplification output circuit EMC to interfere ultra-wideband filter, pass filter part, cutoff and power amplifier are lowerd including power pack, stimulus part, output work, the power amplifier is made of chip U1, and the power pack, stimulus part, output work are lowerd pass filter part and cutoff and connect with chip U1.This power amplification output circuit EMC interferes ultra-wideband filter, low-pass filter circuit is set and carries out low-pass filtering treatment, electromagnetic interference (EMI) can be minimized, and it avoids with too many high-frequency energy drive the speaker, effectively EMC is inhibited to interfere wherein doing shielding processing using inductance L2, inductance L3, inductance L7 and inductance L6；Output end uses capacitor and inductor, and only loud speaker is dissipative cell, and all energy are nearly all to be laid in for speaker operation, and the containing without Simulation scale-up, without negative-feedback, dynamic property are good.

Description

A kind of power amplification output circuit EMC interference ultra-wideband filter

Technical field

The utility model is related to power amplification output circuit technical field, specially a kind of power amplification output circuit EMC interferes ultra-wide Frequency filter.

Background technology

With the development of technology, power amplifier developing history is divided into four electron tube, transistor, integrated circuit, field-effect tube ranks Section.In decades, people pay unremitting effort for it, no matter in terms of Line technology or component, onto thought and knowledge The progress of bigger is all achieved, but traditional sound equipment power amplifier has quiescent current consumption, power consumption is big, Simulation scale-up and feedback It restrains so that dynamic characteristic is bad, and bad to the inhibition of EMC interference at work, is based on this, proposes a kind of power amplifier Output circuit EMC interferes ultra-wideband filter.

Utility model content

The purpose of this utility model is to provide a kind of power amplification output circuit EMC to interfere ultra-wideband filter, has volume It is small, it is at low cost, low in energy consumption, the advantages of work efficiency is high, solve the problems of the prior art.

To achieve the above object, the utility model provides the following technical solutions：

A kind of power amplification output circuit EMC interference ultra-wideband filter, including power pack, stimulus part, output work Pass filter part, cutoff and power amplifier are lowerd, the power amplifier is made of chip U1, the power pack, letter Number importation, output work are lowerd pass filter part and cutoff and are connect with chip U1；

The power pack includes capacitance C20 to capacitance C26, inductance L1 and inductance L4；

The foot 26 and foot 30 of the chip U1 is grounded, the 25 serial capacitance C25 ground connection of foot of chip U1；The foot 27 of chip U1 is gone here and there Connecting resistance R7 ground connection, the 28 serial capacitance C21 ground connection of foot of chip U1, the 29 serial capacitance C20 ground connection of foot of chip U1, chip U1's 33 tandem electric inductance L1 of foot connects VDD, the input termination capacitor C22 ground connection of inductance L1, the both ends shunt-wound capacitance C24 of capacitance C22, chip The 36 serial capacitance C23 ground connection of foot of U1, the output termination inductance L4 of inductance L1 connect the input terminal of capacitance C7, the input terminal of inductance L4 Connect capacitance C26 ground connection；

The stimulus part include capacitance C1 to C5, resistance R1 to R6, right-channel signals access terminal SP_IN_R and Left channel signals access terminal SP_IN_L；

Foot 2, foot 4 and the foot 6 of the chip U1 distinguishes serial capacitance C1, capacitance C3 and capacitance C5 ground connection；The chip The foot 3 of U1 is sequentially connected in series capacitance C2 and resistance R5 and meets right-channel signals access terminal SP_IN_R, and the foot 5 of chip U1 is sequentially connected in series Capacitance C4 and resistance R6 meets left channel signals access terminal SP_IN_L；The foot 7 of the chip U1 is sequentially connected in series resistance R1 and resistance R3 connects VCC, the input terminal of the 1 series resistor R4 connecting resistances R3 of foot of chip U1, the output end and connecting resistance R2 connecting resistances of resistance R4 The output end of R1, the input terminal of the 9 connecting resistance R1 of foot of chip U1；

It includes capacitance C6 to C19, inductance L6, inductance L7, inductance L13, inductance L14 that the output work, which lowers pass filtering section point, And terminal SP_OUT_L- and SP_OUT_L+, terminal SP_OUT_R- and terminal SP_OUT_R+；

The foot 13 of the chip U1 is sequentially connected in series capacitance C6 and inductance L6 meets terminal SP_OUT_L-, the foot 24 of chip U1 according to Secondary serial capacitance C9 and inductance L7 connects terminal SP_OUT_L+, foot 18 and foot 19 ground connection of chip U1, the foot 14 and foot of chip U1 15 serial capacitance C7 ground connection, the 23 serial capacitance C8 ground connection of foot 22 and foot of chip U1, the foot 16 and foot 17 of chip U1 meet capacitance C6 Output end, the foot 20 and foot 21 of chip U1 connect the output end of capacitance C9；

The foot 37 of the chip U1 is sequentially connected in series capacitance C13 and inductance C2 meets terminal SP_OUT_R+, the foot 48 of chip U1 according to Secondary serial capacitance C16 and inductance L3 connects terminal SP_OUT_R-, foot 42 and foot 42 ground connection of chip U1, the foot 38 and foot of chip U1 39 serial capacitance C13 ground connection, the 47 serial capacitance C15 ground connection of foot 46 and foot of chip U1, the foot 40 and foot 41 of chip U1 connect capacitance The output end of C13, the foot 44 and foot 45 of chip U1 connect the output end of capacitance C16.

Preferably, the cutoff includes resistance R8, R9 and R10 and capacitance C27；The foot 1 of the chip U1 is successively Series resistor R9 and resistance R10 ground connection, the input terminating resistor R8 of resistance R9 meet power supply terminal VCC, and the both ends of resistance R10 are simultaneously Meet capacitance C27.

Preferably, the model APA2172 of the chip U1.

Preferably, the output end serial capacitance C10 ground connection of the inductance L6, the output end serial capacitance C11 of inductance L7 connect Ground, the output termination capacitor C17 ground connection of inductance L2, the output termination capacitor C18 ground connection of inductance L3.

Preferably, shunt-wound capacitance C12 between the terminal SP_OUT_L- and terminal SP_OUT_L+, terminal SP_OUT_R+ and Shunt-wound capacitance C19 between terminal SP_OUT_R-

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

This power amplification output circuit EMC interferes ultra-wideband filter, terminal SP_OUT_R+, terminal SP_OUT_R-, terminal SP_OUT_L+ and terminal SP_OUT_L- connect loud speaker, and it is low that low-pass filter circuit progress is arranged between chip U1 and loud speaker Pass filter processing, can minimize electromagnetic interference (EMI), and avoid with too many high-frequency energy drive the speaker, wherein Doing shielding processing using inductance L2, inductance L3, inductance L7 and inductance L6 effectively can inhibit EMC to interfere；Power amplifier output electricity Road EMC interferes the output end of ultra-wideband filter to use capacitor and inductor, and only loud speaker is dissipative cell, is not required to pass It unites the quiescent current consumption of sound equipment power amplifier, all energy are laid in for speaker operation, and without Simulation scale-up, nothing The containing of negative-feedback, therefore there is better dynamic characteristic, i.e. dynamic property is good, passes through the place of amplifying circuit and low-pass filter circuit Reason, can be by the higher of the medium Frequency Design of output filter, to ensure to obtain flat amplitude-frequency in 20Hz-200KHz Characteristic and good phase-frequency characteristic, entire frequency range are interior without relative phase shift, sound field accurate positioning；Whole component is few, small, at This is low, low in energy consumption, efficient.

Description of the drawings

Fig. 1 is the integrated circuit figure of the utility model；

Fig. 2 is that this practicality output work lowers pass filter partial circuit diagram.

It is indicated in figure：1, power pack；2, stimulus part；3, output work lowers pass filter part；4, shutdown portion Point；5, power amplifier.

Specific implementation mode

The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work The every other embodiment obtained, shall fall within the protection scope of the present invention.

Referring to Fig. 1, a kind of power amplification output circuit EMC interferes ultra-wideband filter, including the input of power pack 1, signal Pass filter part 3, cutoff 4 and power amplifier 5 are lowerd in part 2, output work, and the power amplifier 5 is made of chip U1, The model APA2172 of chip U1, power pack 1, stimulus part 2, output work lower pass filter part 3 and cutoff 4 connect with chip U1.

Power pack 1 includes capacitance C20 to capacitance C26, inductance L1 and inductance L4；The foot 26 and foot 30 of chip U1 is grounded, The 25 serial capacitance C25 ground connection of foot of chip U1；The 27 series resistor R7 ground connection of foot of chip U1,28 serial capacitance of foot of chip U1 C21 is grounded, and the 29 serial capacitance C20 ground connection of foot of chip U1, the 33 tandem electric inductance L1 of foot of chip U1 connects VDD, the input of inductance L1 Termination capacitor C22 ground connection, the 36 serial capacitance C23 ground connection of foot of the both ends shunt-wound capacitance C24 of capacitance C22, chip U1, inductance L1 Output termination inductance L4 connect the input terminal of capacitance C7, the input termination capacitor C26 ground connection of inductance L4.

Stimulus part 2 includes capacitance C1 to C5, resistance R1 to R6, right-channel signals access terminal SP_IN_R and a left side Sound channel signal accesses terminal SP_IN_L；Foot 2, foot 4 and the foot 6 of chip U1 distinguishes serial capacitance C1, capacitance C3 and capacitance C5 Ground connection；The foot 3 of chip U1 is sequentially connected in series capacitance C2 and resistance R5 and meets right-channel signals access terminal SP_IN_R, passes through right channel Signal accesses terminal SP_IN_R input signals, and resistance R5 and capacitance C2 constitute RC filter circuits, sent after being filtered to signal Enter the RINP feet of chip, i.e. foot 3, the foot 5 of chip U1 is sequentially connected in series capacitance C4 and resistance R6 and connects left channel signals access terminal SP_IN_L accesses terminal SP_IN_L input signals by left channel signals, and resistance R6 and capacitance C4 constitute filter circuit, to letter The LINP feet of chip U1, i.e. foot 5 are sent into after number filtering；The foot 7 of chip U1 is sequentially connected in series resistance R1 and resistance R3 connects VCC, chip The input terminal of the 1 series resistor R4 connecting resistances R3 of foot of U1, the output end of resistance R4 and the output end of connecting resistance R2 connecting resistances R1, The input terminal of the 9 connecting resistance R1 of foot of chip U1.

Output work lower pass filter part 3 include capacitance C6 to C19, inductance L6, inductance L7, inductance L13, inductance L14 with And terminal SP_OUT_L- and SP_OUT_L+, terminal SP_OUT_R- and terminal SP_OUT_R+；The foot 13 of chip U1 is sequentially connected in series Capacitance C6 and inductance L6 meets terminal SP_OUT_L-, and the foot 24 of chip U1 is sequentially connected in series capacitance C9 and inductance L7 meets terminal SP_ The foot 18 and foot 19 of OUT_L+, shunt-wound capacitance C12 between terminal SP_OUT_L- and terminal SP_OUT_L+, chip U1 are grounded, chip The 15 serial capacitance C7 ground connection of foot 14 and foot of U1, the 23 serial capacitance C8 ground connection of foot 22 and foot of chip U1,16 He of foot of chip U1 Foot 17 connects the output end of capacitance C6, and the foot 20 and foot 21 of chip U1 connect the output end of capacitance C9, the output end concatenation electricity of inductance L6 Hold C10 ground connection, the output end serial capacitance C11 ground connection of inductance L7；Capacitance C6, inductance L6 and capacitance C10 form LC low-pass filtering Circuit, the LC low-pass filtering that the signal that the foot BSLN of chip U1, i.e. foot 13 are exported is made of capacitance C6, inductance L6 and capacitance C10 After circuit carries out low-pass filtering treatment, it is finally conveyed to SP_OUT_L-；Capacitance C9, inductance L7 and capacitance C11 form low pass filtered Wave circuit, low-pass filtering of the signal through capacitance C9, inductance L7 and capacitance C11 compositions of the foot BSLP of chip U1, i.e. foot 24 output After circuit carries out low-pass filtering treatment, it is finally conveyed to SP_OUT_L+.

The foot 37 of chip U1 is sequentially connected in series capacitance C13 and inductance C2 meets terminal SP_OUT_R+, and the foot 48 of chip U1 is successively Serial capacitance C16 and inductance L3 connects terminal SP_OUT_R-, shunt-wound capacitance between terminal SP_OUT_R+ and terminal SP_OUT_R- The foot 42 and foot 42 of C19, chip U1 are grounded, the 39 serial capacitance C13 ground connection of foot 38 and foot of chip U1,46 He of foot of chip U1 47 serial capacitance C15 ground connection of foot, the foot 40 and foot 41 of chip U1 connect the output end of capacitance C13, the foot 44 and foot 45 of chip U1 Connect the output end of capacitance C16, the output termination capacitor C17 ground connection of inductance L2, the output termination capacitor C18 ground connection of inductance L3；Electricity Hold C13, inductance L2 and capacitance C17 forms low-pass filter circuit, the signal of the foot BSRP of chip U1, i.e. foot 37 output is through capacitance After the low-pass filter circuit of C13, inductance L2 and capacitance C17 compositions carries out low-pass filtering treatment, it is finally conveyed to terminal SP_OUT_ R+；Capacitance C16, inductance L3 and capacitance C18 form low-pass filter circuit, the signal warp of the foot BSRN of chip U1, i.e. foot 48 output After the low-pass filter circuit of capacitance C16, inductance L3 and capacitance C18 compositions carries out low-pass filtering treatment, it is finally conveyed to terminal SP_ OUT_R-。

Cutoff 4 includes resistance R8, R9 and R10 and capacitance C27；The foot 1 of chip U1 is sequentially connected in series resistance R9 and electricity R10 ground connection is hindered, the input terminating resistor R8 of resistance R9 connects power supply terminal VCC, the both ends shunt-wound capacitance C27 of resistance R10, resistance R9, resistance R10, resistance R8, capacitance C27 and power supply terminal VCC constitute power supply circuit, whether by powering on terminal VCC come Realization is cut-off.

Power amplification output circuit EMC interferes ultra-wideband filter, operation principle as follows：Terminal is accessed by right-channel signals SP_IN_R inputs right-channel signals, and the series circuit that right-channel signals are formed through resistance R5 and capacitance C2 is sent into chip U1's RINN feet, after chip U1 processing, all the way signal exported by BSRP feet formed to capacitance C13, inductance L2 and capacitance C17 it is low Bandpass filter circuit carries out low-pass filtering treatment, and terminal SP_OUT_R+ is finally conveyed to after processing；Another way signal is defeated by BSRN feet Go out and carry out low-pass filtering treatment to the low-pass filter circuit of capacitance C16, inductance L3 and capacitance C18 compositions, is finally conveyed after processing Give terminal SP_OUT_R-；Terminal SP_IN_L is accessed by left channel signals and inputs left channel signals, and left channel signals are through resistance The series circuit of R6 and capacitance C4 compositions is sent into LINP feet, and after chip U1 processing, signal is exported by BSLP feet to capacitance all the way The low-pass filter circuit of C9, inductance L7 and capacitance C11 compositions carries out low-pass filtering treatment, and terminal SP_ is finally conveyed to after processing OUT_L+；Another way signal exports the LC low-pass filter circuits formed to capacitance C6, inductance L6 and capacitance C10 by BSLN feet and carries out After low-pass filtering treatment, it is finally conveyed to terminal SP_OUT_L-；Terminal SP_OUT_R+, terminal SP_OUT_R-, terminal SP_ OUT_L+ and terminal SP_OUT_L- connect loud speaker, and low-pass filter circuit is arranged between chip U1 and loud speaker and carries out low pass filtered Wave processing, can minimize electromagnetic interference (EMI), and avoid with too many high-frequency energy drive the speaker, wherein utilizing Inductance L2, inductance L3, inductance L7 and inductance L6, which do shielding processing, effectively EMC to be inhibited to interfere；The power amplification output circuit EMC interference ultra-wideband filters are not required to the quiescent current consumption of traditional sound equipment power amplifier, and all energy are nearly all for loud speaker work Make and lay in, and the containing without Simulation scale-up, without negative-feedback, therefore there is better dynamic characteristic, is i.e. dynamic property is good, capacitance C12 composition amplifying circuits in parallel with capacitance C10 and capacitance C11, capacitance C19 and capacitance C18 and capacitance C17 constitute amplifying circuit, It, can be by the higher of the medium Frequency Design of output filter, to protect by the processing of amplifying circuit and low-pass filter circuit Card obtains flat amplitude versus frequency characte and good phase-frequency characteristic in 20Hz-200KHz so that without opposite phase in entire frequency range It moves, sound field accurate positioning.

In summary：This power amplification output circuit EMC interferes ultra-wideband filter, terminal SP_OUT_R+, terminal SP_OUT_ R-, terminal SP_OUT_L+ and terminal SP_OUT_L- connect loud speaker, and low-pass filter circuit is arranged between chip U1 and loud speaker Low-pass filtering treatment is carried out, electromagnetic interference (EMI) can be minimized, and avoids raising one's voice with too many high-frequency energy driving Device effectively can inhibit EMC to interfere wherein doing shielding processing using inductance L2, inductance L3, inductance L7 and inductance L6, improve Working efficiency；The output end of power amplification output circuit EMC interference ultra-wideband filters uses capacitor and inductor, only raises one's voice Device is dissipative cell, is not required to the quiescent current consumption of traditional sound equipment power amplifier, and all energy are stored up for speaker operation It is standby, and the containing without Simulation scale-up, without negative-feedback, therefore there is better dynamic characteristic, i.e. dynamic property is good, by amplifying electricity The processing on road and low-pass filter circuit, can be by the higher of the medium Frequency Design of output filter, to ensure in 20Hz- Flat amplitude versus frequency characte and good phase-frequency characteristic are obtained in 200KHz, entire frequency range is interior without relative phase shift, sound field accurate positioning； Whole component is few, small, at low cost, low in energy consumption, efficient.

While there has been shown and described that the embodiments of the present invention, for the ordinary skill in the art, It is appreciated that can these embodiments be carried out with a variety of variations in the case where not departing from the principles of the present invention and spirit, repaiied Change, replace and modification, the scope of the utility model are defined by the appended claims and the equivalents thereof.

Claims (5)

1. a kind of power amplification output circuit EMC interferes ultra-wideband filter, including it is power pack (1), stimulus part (2), defeated Go out power amplifier low-pass filtering part (3), cutoff (4) and power amplifier (5), it is characterised in that：The power amplifier (5) by Chip U1 compositions, the power pack (1), stimulus part (2), output work lower pass filter part (3) and cutoff (4) it is connect with chip U1；

The power pack (1) includes capacitance C20 to capacitance C26, inductance L1 and inductance L4；

The foot 26 and foot 30 of the chip U1 is grounded, the 25 serial capacitance C25 ground connection of foot of chip U1；The foot 27 of chip U1 concatenates electricity Hinder R7 ground connection, the 28 serial capacitance C21 ground connection of foot of chip U1, the 29 serial capacitance C20 ground connection of foot of chip U1, the foot 33 of chip U1 Tandem electric inductance L1 meets VDD, and the input termination capacitor C22 of inductance L1 is grounded, the both ends shunt-wound capacitance C24 of capacitance C22, chip U1's 36 serial capacitance C23 ground connection of foot, the output termination inductance L4 of inductance L1 connect the input terminal of capacitance C7, the input termination electricity of inductance L4 Hold C26 ground connection；

The stimulus part (2) include capacitance C1 to C5, resistance R1 to R6, right-channel signals access terminal SP_IN_R and Left channel signals access terminal SP_IN_L；

Foot 2, foot 4 and the foot 6 of the chip U1 distinguishes serial capacitance C1, capacitance C3 and capacitance C5 ground connection；The chip U1's Foot 3 is sequentially connected in series capacitance C2 and resistance R5 and meets right-channel signals access terminal SP_IN_R, and the foot 5 of chip U1 is sequentially connected in series capacitance C4 and resistance R6 meets left channel signals access terminal SP_IN_L；The foot 7 of the chip U1 is sequentially connected in series resistance R1 and resistance R3 connects The input terminal of the 1 series resistor R4 connecting resistances R3 of foot of VCC, chip U1, the output end of resistance R4 and connecting resistance R2 connecting resistances R1's Output end, the input terminal of the 9 connecting resistance R1 of foot of chip U1；

It includes capacitance C6 to C19, inductance L6, inductance L7, inductance L13, inductance L14 that the output work, which lowers pass filter part (3), And terminal SP_OUT_L- and SP_OUT_L+, terminal SP_OUT_R- and terminal SP_OUT_R+；

The foot 13 of the chip U1 is sequentially connected in series capacitance C6 and inductance L6 meets terminal SP_OUT_L-, and the foot 24 of chip U1 is gone here and there successively It meets capacitance C9 and inductance L7 and connects terminal SP_OUT_L+, foot 18 and foot 19 ground connection of chip U1, foot 14 and foot 15 concatenation of chip U1 Capacitance C7 ground connection, the 23 serial capacitance C8 ground connection of foot 22 and foot of chip U1, the foot 16 and foot 17 of chip U1 connect the output of capacitance C6 End, the foot 20 and foot 21 of chip U1 connect the output end of capacitance C9；

The foot 37 of the chip U1 is sequentially connected in series capacitance C13 and inductance C2 meets terminal SP_OUT_R+, and the foot 48 of chip U1 is gone here and there successively It meets capacitance C16 and inductance L3 and connects terminal SP_OUT_R-, foot 42 and foot 42 ground connection of chip U1, foot 38 and foot 39 string of chip U1 Capacitance C13 ground connection is connect, the 47 serial capacitance C15 ground connection of foot 46 and foot of chip U1, the foot 40 and foot 41 of chip U1 connect capacitance C13's Output end, the foot 44 and foot 45 of chip U1 connect the output end of capacitance C16.

2. a kind of power amplification output circuit EMC according to claim 1 interferes ultra-wideband filter, it is characterised in that：It is described Cutoff (4) includes resistance R8, R9 and R10 and capacitance C27；The foot 1 of the chip U1 is sequentially connected in series resistance R9 and resistance R10 is grounded, and the input terminating resistor R8 of resistance R9 meets power supply terminal VCC, the both ends shunt-wound capacitance C27 of resistance R10.

3. a kind of power amplification output circuit EMC according to claim 1 interferes ultra-wideband filter, it is characterised in that：It is described The model APA2172 of chip U1.

4. a kind of power amplification output circuit EMC according to claim 1 interferes ultra-wideband filter, it is characterised in that：It is described The output end serial capacitance C10 ground connection of inductance L6, the output end serial capacitance C11 ground connection of inductance L7, the output termination of inductance L2 Capacitance C17 ground connection, the output termination capacitor C18 ground connection of inductance L3.

5. a kind of power amplification output circuit EMC according to claim 1 interferes ultra-wideband filter, it is characterised in that：It is described Shunt-wound capacitance C12 between terminal SP_OUT_L- and terminal SP_OUT_L+, between terminal SP_OUT_R+ and terminal SP_OUT_R- and connects Capacitance C19.