CN104702221A - PWM (pulse width modulation) audio power amplifier - Google Patents
PWM (pulse width modulation) audio power amplifier Download PDFInfo
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Abstract
The invention discloses a PWM (pulse width modulation) audio power amplifier comprising a linear isolating module, a PWM amplifying modulating thick-film, a suspending drive module, a high-tension power bridge and a Butterworth filter. The audio signal input end is connected with the input end of the linear isolating module. The output end of the Butterworth filter is connected with a load of the amplifier. supplied power of the amplifier passes a bridge rectifier circuit, an LPF (low pass filter) and a dual-closed ring APFC (active power factor correction) circuit and is then transmitted to the PWM amplifying modulating thick-film, the suspending drive module, the high-tension power bridge and the Butterworth filter; the PWM amplifying modulating thick-film, the suspending drive module, the high-tension power bridge and the Butterworth filter form a class-D bridge power amplifier topological structure. The amplifier integrating signal amplifying, driving, amplified power output and power supply has the advantages that efficiency of the amplifier is greatly improved, service efficiency of the power supply is greatly improved, and electromagnetic interference of equipment is greatly improved.
Description
Technical field
The present invention relates to high-power digital power amplification field, particularly relate to a kind of PWM power amplifier.
Background technology
Power audio signal amplifier is one of most important analog electronics, and it can be enlarged into high power signals lower powered audio signal.Audio frequency power amplifier is divided into two large battle arrays from amplification principle: traditional analog circuit power amplifier and the digital circuit power amplifier occurred in recent years.Analog circuit power amplifier includes the audio signal amplifier of category-A, category-B, AB type, and they are sweet with tonequality and feature that is technology maturation is leading in many decades in audio area.
But it is low that the shortcoming that this power-like amplifier is the most fatal is exactly power supply conversion efficiency.Because the energy that signal exports is provided by power supply, so there is conversion efficiency problem between the two.The theoretical conversion efficiencies of class-a amplifier is 25%.Such as power supply provides 100W energy, only has 25W to be converted to useful signal, and other energy is then converted to heat energy or unwanted signal (also known as interference signal).Category-A conversion regime causes the disadvantages such as power utilization efficiency is low, equipment is complicated, volume is large, energy consumption is serious, and the efficiency of the actual category-A power amplifier used is only tens percent.The theoretical efficiency of the audio signal amplifier of category-B, AB type is 50% and 78.5% respectively, and actual use is only below 40% and 60%.
Therefore, the efficiency improving existing power audio amplifier is the most important living space of audio area, along with the atrophy gradually of the audio signal amplifier living space of category-A, category-B, AB type, Abroad in Recent Years research institution starts to throw huge fund research and development class-D amplifier, and occupies Chinese most digital power amplifier market.
Because this series products of domestic market also rests on the conceptual phase at present substantially, the seldom capable independent development & production of domestic manufacturers, external conventional class D design scheme has also just been indiscriminately imitated by part manufacturer.
D audio frequency amplifier and pulse type switch amount amplifier, have the power supply energy conversion efficiency more than 90%, meets market to green energy resource demand, cause and developed fast in recent years.And because efficient, class-D amplifier volume can do very little, and the volume that can reduce radiator does not even use radiator, the frivolous little development trend of equipment of having complied with.
Class-D amplifier relies on its advantage, is capturing rapidly the market of original traditional category-A and class ab ammplifier.Quagmire that current Chinese Analog Circuit Design enterprise faces that Here it is: cannot compete with the large factory in the world in high-end field, low-end market due to the development of digitizing technique and foreign vendor hard to carry on to low side invasion and attack.
In addition, even to this day, the category-A of international popular, category-B, AB class and D-type audio power amplifier, employing be all mode by power supply and amplifier independent design, power amplifier, power circuit carry out according to parameter given separately two independent particle systems designing in other words.Owing to being the relation doubly taken advantage of between the efficiency of whole system and each subsystem efficiency.Such as, if power supply conversion efficiency η is 1=90%, the efficiency eta 2=80% of power amplifier, seems that both efficiency comparison are high.But overall efficiency η=η 1 × η 2 only has 72%.If consider the coupling between power amplifier, power circuit, overall efficiency also can be lower.The integral machine bragged about on the market now, be also only power amplifier, power circuit are made on one piece of circuit board, it remains independently part separately.
Therefore need badly and provide a kind of novel veritably by power amplifier, power supply integration design and the high audio-frequency power amplifier of power amplification efficiency solves the problems referred to above.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of PWM power amplifier, can realize signal amplification, driving, power amplifier output and power supply integration truly.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: provide a kind of PWM power amplifier, comprise the linear isolation module be connected successively, PWM amplifies modulation thick film, suspension driver module, high-voltage power bridge, Butterworth filter, audio signal input end connecting linear isolation module input, Butterworth filter output connects the load of audio-frequency power amplifier, the power supply of audio-frequency power amplifier is respectively through bridge rectifier, LPF, deliver to PWM after two close cycles APFC circuit and amplify modulation thick film, suspension driver module, high-voltage power bridge, Butterworth filter, PWM amplifies modulation thick film, suspension driver module, high-voltage power bridge and Butterworth filter form D class bridge-type power amplifier amplifier topology.
In a preferred embodiment of the present invention, described linear isolation module comprises linear photoelectric isolation integrated circuit, accurate isolated amplifier integrated circuit.
Linear photoelectric isolation integrated circuit is made up of the input difference circuit be connected successively, biasing circuit, output follower, biasing circuit is composed in parallel by two photoelectric coupled circuit, input difference circuit forms integrator, its output the first photoelectric coupled circuit, the second photoelectric coupled circuit in parallel, the output of two photoelectric coupled circuit is connected in parallel the positive input terminal of output follower.Linear photoelectric isolation integrated circuit adopts binary channels optocoupler working method, while realizing linear transfer, isolates high-low pressure power supply, and the broadening linear output range of circuit.
Accurate isolated amplifier integrated circuit is made up of isolated amplifier, high-gain amplifier, and isolated amplifier adopts transformer coupled mode in sheet to isolate, and in sheet, transformer output connects high-gain amplifier.Accurate isolated amplifier integrated circuit carries out electrical isolation to the input and output of signal.
In a preferred embodiment of the present invention, PWM amplifies modulation thick film by reference voltage generating circuit, triangular wave oscillator, intermittent phase Circuit tuning, error amplifier, PWM comparator and FET output driving circuit composition, intermittent phase, Circuit tuning was by trigger, latch and undervoltage lockout circuit composition, the negative input end connection signal input of error amplifier, positive input terminal connects reference voltage generating circuit, output connects the negative input end of PWM comparator, the output of triangular wave oscillator connects the positive input terminal of PWM comparator respectively, the input of trigger, the output of PWM comparator connects latch, intermittent phase Circuit tuning connects FET output driving circuit.PWM amplifies generation and the modulation that modulation thick film is used for pwm signal.
In a preferred embodiment of the present invention, suspension driver module amplifies the pwm signal employing suspension type of drive after the modulation of modulation thick film to PWM.
In a preferred embodiment of the present invention, high-voltage power bridge adopts full-bridge or half bride power output topology mode, every arm of bridge circuit adopts high-power metallic oxide semiconductor field effect transistor or IGBT pipe power output device.Full-bridge type power stage topology mode is called for short the H way of output, and the H mode outgoing carrier peak-to-peak value that floats can reach 2Vcc, takes full advantage of supply voltage, effectively improves delivery efficiency.
In a preferred embodiment of the present invention, Butterworth filter is second order or fourth order low-pass filter.Owing to containing radio-frequency component in the H way of output of high-voltage power bridge, therefore need when connecing load to carry out low-pass filtering.
In a preferred embodiment of the present invention, two close cycles APFC circuit adopts electric current loop and Voltage loop double loop closed control circuit, make source current active tracing power input voltage and adjustment automatically in time, keep Phase synchronization between the two, power supply conversion efficiency is close to 100%.
In a preferred embodiment of the present invention, described PWM power amplifier adopts power supply adaptive mode, adapts to the power-frequency voltage of any magnitude of voltage.By direct for civil power high pressure supply audio frequency power amplifier, eliminate existing power amplifier and to rely the Industrial Frequency Transformer of work and high power switch power-source transformer, also just decrease energy loss and interference that various transformer brings simultaneously, improve power utilization rate.
The invention has the beneficial effects as follows: the present invention is by power supply, PWM power amplifier, APFC technology and DSP technology combine together, power amplifier, boundlessness between modulation circuit and power circuit, eliminate the step-down low frequency isolation scheme of civil power and power amplifier, suspension Driving technique is adopted in power amplifier rear class, then optical isolator is adopted in preamplifier state, drastically increase efficiency and the power utilization efficiency of power amplifier, reduce the various noise jamming that amplifier various piece is brought owing to intercoupling, the EMI of equipment is improved greatly, really achieve signal to amplify, drive, the integration of power amplifier output and power supply.
Accompanying drawing explanation
Fig. 1 is the structured flowchart of PWM power amplifier one of the present invention preferred embodiment;
Fig. 2 is the circuit theory diagrams of described two close cycles APFC circuit;
Fig. 3 is the circuit theory diagrams of described linear photoelectric isolation integrated circuit;
Fig. 4 is the circuit theory diagrams of described accurate isolated amplifier integrated circuit;
Fig. 5 is described D class bridge-type power amplifier amplifier topology block diagram;
Fig. 6 is the circuit theory diagrams that described PWM amplifies modulation thick film;
Fig. 7 is the circuit theory diagrams of described high-voltage power bridge and Butterworth filter.
Embodiment
Below in conjunction with accompanying drawing, preferred embodiment of the present invention is described in detail, can be easier to make advantages and features of the invention be readily appreciated by one skilled in the art, thus more explicit defining is made to protection scope of the present invention.
Refer to Fig. 1, the embodiment of the present invention comprises:
A kind of PWM power amplifier, comprise the linear isolation module be connected successively, PWM (Pulse WidthModulation, pulse width modulation) amplify modulation thick film, suspension driver module, high-voltage power bridge, Butterworth filter, audio signal input end connecting linear isolation module input, Butterworth filter output connects the load of audio-frequency power amplifier, the power supply of audio-frequency power amplifier is respectively through bridge rectifier, LPF (Low Pass Filter, low pass filter), deliver to PWM after two close cycles APFC circuit and amplify modulation thick film, suspension driver module, high-voltage power bridge, Butterworth filter, PWM amplifies modulation thick film, suspension driver module, high-voltage power bridge and Butterworth filter form D class bridge-type power amplifier amplifier topology.
Described PWM power amplifier adopts power supply adaptive mode, adapts to the power-frequency voltage of any magnitude of voltage.Power input adopts small-power switching power-supply integrated circuit, by direct for civil power high pressure supply audio frequency power amplifier, eliminate existing power amplifier to rely the Industrial Frequency Transformer of work and high power switch power-source transformer, also just decrease energy loss and interference that various transformer brings simultaneously, improve power utilization rate.
Because the present invention has designed in direct-current power supply partial cancellation the transformer rectifier power source of popular pulse type switch power supply and classics, eliminate the pattern of low-voltage power supply of the prior art design audio-frequency power amplifier simultaneously, by direct for civil power high pressure supply audio frequency power amplifier, eliminating pulse type switch power supply and the necessary high frequency of transformer rectifier power source, after low-frequency transformer, rectifier in ac-dc conversion circuit and the present invention does not only control diode or silicon rectifier cell is formed by non-linear, its working method will cause input current high frequency harmonic components high, seriously polluted to electrical network, and make alternating current net side voltage produce distortion, affect other electrical equipment normally to work, therefore the design part of the present invention to power supply have employed Active Power Factor Correction Technology APFC (Active PFC).Power supply delivers to two close cycles APFC circuit after the filtering of the AC-DC converter of rectifier, LPF (low pass filter).
Refer to Fig. 2, input voltage delivers to rectifier after electromagnetic interface filter filtering, rectifier is single-phase bridge, and main circuit adopts DC/DC translation circuit, and control circuit is containing the PWM controller of voltage error amplifier, current error amplifier, analog multiplier and fixed frequency.Inner ring (electric current inputs through PWM controller to S and inductance L) is electric current loop, completes the sampling to Boost inductive current IL, and adopts the duty ratio of one circle control Schema control pwm signal.Outer shroud (input voltage samples multiplier, output voltage adopts through comparator to multiplier) is Voltage loop, completes the sampling of input voltage and output voltage.What adopt due to whole circuit is closed-loop control, and electric current loop has higher gain bandwidth product, and the distortion that tracking error is produced is less than 1%, easily realizes the power factor close to 1.Two close cycles APFC circuit adopts electric current loop and Voltage loop double loop close-loop control mode, make source current active tracing power input voltage and adjustment automatically in time, keep Phase synchronization between the two, and make the total harmonic distortion THD of DC power supply control within 5%, power supply conversion efficiency, close to 100%, improves power utilization rate from the angle of power supply input.
DC power supply is supplied to respectively PWM after two close cycles APFC circuit and amplifies modulation thick film, suspension driver module, high-voltage power bridge, Butterworth filter, PWM amplifies modulation thick film, suspension driver module, high-voltage power bridge formation D class bridge-type power amplifier amplifier topology.D class bridge-type power amplifier amplifier topology is first delivered in the audio signal input of described PWM power amplifier after the electrical isolation of linear isolation module, and final output signal is to the load of audio-frequency power amplifier.
Described linear isolation module comprises two kinds of circuit, and one is linear photoelectric isolation integrated circuit, and another is accurate isolated amplifier integrated circuit.
Refer to Fig. 3, linear photoelectric isolation integrated circuit is made up of the input difference circuit be connected successively, biasing circuit, output follower, and biasing circuit is composed in parallel by two photoelectric coupled circuit.Signal inputs to the positive input terminal of input difference circuit, and input difference circuit forms integrator, and its output the first photoelectric coupled circuit, the second photoelectric coupled circuit in parallel, the output of two photoelectric coupled circuit is connected in parallel the positive input terminal of output follower.Linear photoelectric isolation integrated circuit adopts offsetting and differential technique, completes the amplification to input audio signal, and the isolation to high-low pressure power supply.For input signal, the change of two photoelectric coupled circuit channel gains is contrary, error signal in output amplifier, form superposition, thus eliminate common mode disturbances, counteract the nonlinear distortion of light-emitting diode (not shown).Input operational amplifier forms integrator, prevents from occurring triangular wave at output, affects the precision of circuit; Output operational amplifier is designed to follower, the isolation of complete pair signals and amplification.Linear photoelectric isolation integrated circuit adopts binary channels optocoupler working method, while realizing linear transfer, isolates high-low pressure power supply, and the broadening linear output range of circuit.
Refer to Fig. 4, accurate isolated amplifier integrated circuit is made up of isolated amplifier, high-gain amplifier, and isolated amplifier adopts transformer coupled mode in sheet to isolate, and in sheet, transformer output connects high-gain amplifier.Accurate isolated amplifier is by transformer coupled in sheet, electrical isolation is carried out to the input and output of signal, the linearity providing 0.025% from DC in the frequency of several KHz can be provided, V-f conversion is first carried out in isolated amplifier inside, transformer isolation is carried out to the AC signal produced, then carries out f-V conversion and reach isolation effect.
Composition graphs 5, introduces each several part circuit structure of D class bridge-type power amplifier amplifier topology below respectively.
Refer to Fig. 6, PWM amplifies generation and the modulation that modulation thick film is used for pwm signal, it exports driving gate circuit by reference voltage generating circuit, triangular wave oscillator, intermittent phase Circuit tuning, error amplifier, PWM comparator and FET and forms, and intermittent phase Circuit tuning is made up of trigger, latch and undervoltage lockout circuit.The negative input end that the negative input end connection signal input of error amplifier, positive input terminal connect reference voltage generating circuit, output connects PWM comparator, the output of triangular wave oscillator connects the positive input terminal of PWM comparator, the input of trigger respectively, the output of PWM comparator connects latch, and intermittent phase Circuit tuning connects FET and exports driving gate circuit.Error amplifier switching rate must ensure that, at 2V/ more than μ s, its input has the common mode inhibition capacity of-0.3V ~ 2V.PWM comparator completes pulse modulation, to be compared realize PWM by the linear triangular wave of forward with input signal (i.e. reference voltage).FET output driving gate circuit completes the driving to output power amplifier.Flip flop design divider, obtains that duty ratio D is 0.5, frequency is the square wave of local frequency l/2OSC.Undervoltage latch circuit sampling external signal, plays the effect that protection FET exports driving gate circuit.
Described suspension driver module amplifies the pwm signal employing suspension type of drive after the modulation of modulation thick film to PWM.Because the driving stage of amplifier and the power supply of power-amplifier stage eliminate buffer circuit, two-stage is powered becomes principal contradiction.The operating voltage of driving stage is generally at ± about 15V, and the operating voltage of power amplifier is between 300 ~ 400V, adopts same supply voltage to be almost impossible.If adopt traditional step-down scheme, the reduction of power-efficient will be caused again.In the present invention, the switching transistor of the bridge-type way of output adopts the MOSFEET of same polarity, then the excitation potential of first half FET grid must be higher than positive source current potential, this just requires to arrange one group of independently working power to upper tube grid exciting circuit, meanwhile, need to take isolated transmission to the pumping signal of upper tube grid.Popular isolated transmission mode generally adopts optocoupler or pulse transformer coupled modes.According to optocoupler mode, there is the problems such as current excitation scarce capacity, operating rate be fast not, need to force Current amplifier, exciting circuit structure seems complicated; Independently be coupled according to pulse transformer, operating rate and exciting current ratio are easier to process, but can lose the lower modulation signal composition of frequency.Present invention employs the mode suspending and drive, eliminate optocoupler or pulse transformer, certainly also just avoid the disadvantage that they bring.
Refer to Fig. 7, high-voltage power bridge adopts full-bridge or half bride power output topology mode, every arm of bridge circuit adopts high-power metallic oxide semiconductor field effect transistor or IGBT pipe power output device, the switching tube 1 namely shown in figure, switching tube 2, switching tube 3, switching tube 4.Be full-bridge type power stage topology mode shown in figure, be called for short the H way of output, also referred to as Differential Output mode, the H mode outgoing carrier peak-to-peak value that floats can reach 2Vcc, takes full advantage of supply voltage, effectively improves delivery efficiency.
Energy is back to the fundamental characteristics that power supply is class-D amplifier.Particularly when power amplifier output low frequency signal, in half bride power output topology mode, power supply absorption returns from power amplifier the energy come can cause serious busbar voltage fluctuation, and an arm in the H way of output consumes the energy of another arm substantially, does not have the energy that can reflux.The intrinsic difference output structure of H way of output topology can harmonic carcellation distortion and direct current biasing, allows by better PWM scheme, such as quantizes almost do not have vicious three horizontal PWM schemes.Owing to having high-frequency components in the H way of output, therefore need when connecing load to carry out low-pass filtering.
The present invention exports and adopts Butterworth filter Butterworth filter.What export due to DSP class power amplifier amplifier is PWM ripple, has to pass through low pass filter LPF and will could reduce audio signal after the high-frequency components filtering in PWM ripple.If there is no LPF, the lead-in wire between amplifier and loudspeaker can cause larger radio-frequency radiation interference.Butterworth filter, solves interference problem preferably, raises the efficiency, and the products noise coefficient designed meets international standard.
In a preferred embodiment, the frequency band range due to audio frequency is 20Hz ~ 20kHz, and carrier frequency normally its more than 5 times.Therefore, design a second order or fourth order low-pass filter LPF, can ensure that index signal output is in claimed range.
Second order LC low pass filter can be summed up as the second order differential equation of a band initial condition:
be Laplce L to this equation to convert,
Transfer function
this function is solved, inductance, capacitance.
Described PWM power amplifier adopts modular thick film designs mode, reduces complexity and the design production cost of design, and adopts integrated pcb board to design, reduce interference, reduce volume.
The present invention is by power supply, PWM power amplifier, APFC technology and DSP technology combine together, power amplifier, boundlessness between modulation circuit and power circuit, eliminate the step-down low frequency isolation scheme of civil power and power amplifier, suspension Driving technique is adopted in power amplifier rear class, then optical isolator is adopted in preamplifier state, drastically increase efficiency and the power utilization efficiency of power amplifier, reduce the various noise jamming that amplifier various piece is brought owing to intercoupling, the EMI of equipment is improved greatly, really achieve signal to amplify, drive, the integration of power amplifier output and power supply.
The foregoing is only embodiments of the invention; not thereby the scope of the claims of the present invention is limited; every utilize specification of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (10)
1. a PWM power amplifier, it is characterized in that, comprise the linear isolation module be connected successively, PWM amplifies modulation thick film, suspension driver module, high-voltage power bridge, Butterworth filter, audio signal input end connecting linear isolation module input, Butterworth filter output connects the load of audio-frequency power amplifier, the power supply of audio-frequency power amplifier is respectively through bridge rectifier, LPF, deliver to PWM after two close cycles APFC circuit and amplify modulation thick film, suspension driver module, high-voltage power bridge, Butterworth filter, PWM amplifies modulation thick film, suspension driver module, high-voltage power bridge and Butterworth filter form D class bridge-type power amplifier amplifier topology.
2. PWM power amplifier according to claim 1, is characterized in that, linear isolation module comprises linear photoelectric isolation integrated circuit, accurate isolated amplifier integrated circuit.
3. PWM power amplifier according to claim 2, it is characterized in that, linear photoelectric isolation integrated circuit is made up of the input difference circuit be connected successively, biasing circuit, output follower, biasing circuit is composed in parallel by two photoelectric coupled circuit, input difference circuit forms integrator, its output the first photoelectric coupled circuit, the second photoelectric coupled circuit in parallel, the output of two photoelectric coupled circuit is connected in parallel the positive input terminal of output follower.
4. PWM power amplifier according to claim 2, it is characterized in that, accurate isolated amplifier integrated circuit is made up of isolated amplifier, high-gain amplifier, isolated amplifier adopts transformer coupled mode in sheet to isolate, and in sheet, transformer output connects high-gain amplifier.
5. PWM power amplifier according to claim 1, it is characterized in that, PWM amplifies modulation thick film by reference voltage generating circuit, triangular wave oscillator, intermittent phase Circuit tuning, error amplifier, PWM comparator and FET output driving circuit composition, intermittent phase, Circuit tuning was by trigger, latch and undervoltage lockout circuit composition, the negative input end connection signal input of error amplifier, positive input terminal connects reference voltage generating circuit, output connects the negative input end of PWM comparator, the output of triangular wave oscillator connects the positive input terminal of PWM comparator respectively, the input of trigger, the output of PWM comparator connects latch, intermittent phase Circuit tuning connects FET output driving circuit.
6. PWM power amplifier according to claim 1, is characterized in that, suspension driver module amplifies the pwm signal employing suspension type of drive after the modulation of modulation thick film to PWM.
7. PWM power amplifier according to claim 1, it is characterized in that, high-voltage power bridge adopts full-bridge or half bride power output topology mode, every arm of bridge circuit adopts high-power metallic oxide semiconductor field effect transistor or IGBT pipe power output device.
8. PWM power amplifier according to claim 1, is characterized in that, Butterworth filter is second order or fourth order low-pass filter.
9. PWM power amplifier according to claim 1, is characterized in that, two close cycles APFC circuit adopts electric current loop and Voltage loop double loop closed control circuit.
10. PWM power amplifier according to claim 1, is characterized in that, described PWM power amplifier adopts power supply adaptive mode, adapts to the power-frequency voltage of any magnitude of voltage.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104917466A (en) * | 2015-06-11 | 2015-09-16 | 东南大学 | Pulsed power amplifier using drain electrode modulation mode |
| CN106160677A (en) * | 2016-06-16 | 2016-11-23 | 长沙湘计海盾科技有限公司 | A kind of carried shift PWM modulation type digital power amplifier and power-magnifying method |
| CN107171544A (en) * | 2017-05-23 | 2017-09-15 | 杭州电子科技大学 | A kind of full digital full-bridge isolated single-phase single-grade PFC（PFC）Converter |
| CN107347171A (en) * | 2017-08-25 | 2017-11-14 | 东莞中拓机械技术开发有限公司 | A kind of pulsewidth modulation 600W+150W（PFC）Power amplifier module |
| CN107396245A (en) * | 2017-08-25 | 2017-11-24 | 东莞中拓机械技术开发有限公司 | A kind of pulsewidth modulation 700W+700W (PFC) power amplifier module |
| CN111512544A (en) * | 2017-12-20 | 2020-08-07 | 杜比实验室特许公司 | Configurable modal amplifier system |
| CN111541430A (en) * | 2020-05-21 | 2020-08-14 | 张金路 | Compound series digital power amplifier |
| CN115134709A (en) * | 2022-09-01 | 2022-09-30 | 宏晶微电子科技股份有限公司 | Signal processing method and device and electronic equipment |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6469917B1 (en) * | 2001-08-16 | 2002-10-22 | Green Power Technologies Ltd. | PFC apparatus for a converter operating in the borderline conduction mode |
| US6737846B1 (en) * | 2002-12-17 | 2004-05-18 | Green Power Technologies Ltd. | Method and voltage feedback circuitry for improving the performance of APFC converters |
| CN1805274A (en) * | 2005-01-12 | 2006-07-19 | Qsc音频产品公司 | Multi-chunnel, multi-power d kind amplifier with stabilized power |
| CN201075835Y (en) * | 2007-09-20 | 2008-06-18 | 成都天奥电子有限公司 | New type audio power amplifier supply power |
| CN201577030U (en) * | 2009-11-20 | 2010-09-08 | 恩平市西特尔数码科技有限公司 | PWM power amplifier for bipolar soft switch |
| CN204465463U (en) * | 2015-03-29 | 2015-07-08 | 安徽财经大学 | PWM power amplifier |
-
2015
- 2015-03-29 CN CN201510140641.1A patent/CN104702221B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6469917B1 (en) * | 2001-08-16 | 2002-10-22 | Green Power Technologies Ltd. | PFC apparatus for a converter operating in the borderline conduction mode |
| US6737846B1 (en) * | 2002-12-17 | 2004-05-18 | Green Power Technologies Ltd. | Method and voltage feedback circuitry for improving the performance of APFC converters |
| CN1805274A (en) * | 2005-01-12 | 2006-07-19 | Qsc音频产品公司 | Multi-chunnel, multi-power d kind amplifier with stabilized power |
| CN201075835Y (en) * | 2007-09-20 | 2008-06-18 | 成都天奥电子有限公司 | New type audio power amplifier supply power |
| CN201577030U (en) * | 2009-11-20 | 2010-09-08 | 恩平市西特尔数码科技有限公司 | PWM power amplifier for bipolar soft switch |
| CN204465463U (en) * | 2015-03-29 | 2015-07-08 | 安徽财经大学 | PWM power amplifier |
Non-Patent Citations (2)
| Title |
|---|
| MA ROJAS-GONZALEZ,ETC: "Design of a Class D Audio Amplifier IC Using Sliding Mode Control and Negative Feedback", 《IEEE TRANSACTIONS ON CONSUMER ELECTRONICS》 * |
| 杨鹏等: "基于PWM的D类音频功率放大器设计", 《中国集成电路》 * |
Cited By (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104917466B (en) * | 2015-06-11 | 2017-08-11 | 东南大学 | A kind of pulse power amplifier of use drain modulation mode |
| CN104917466A (en) * | 2015-06-11 | 2015-09-16 | 东南大学 | Pulsed power amplifier using drain electrode modulation mode |
| CN106160677A (en) * | 2016-06-16 | 2016-11-23 | 长沙湘计海盾科技有限公司 | A kind of carried shift PWM modulation type digital power amplifier and power-magnifying method |
| CN107171544A (en) * | 2017-05-23 | 2017-09-15 | 杭州电子科技大学 | A kind of full digital full-bridge isolated single-phase single-grade PFC（PFC）Converter |
| CN107347171B (en) * | 2017-08-25 | 2023-12-22 | 东莞精恒电子有限公司 | Pulse width modulation 600W+150W (PFC) power amplifier module |
| CN107347171A (en) * | 2017-08-25 | 2017-11-14 | 东莞中拓机械技术开发有限公司 | A kind of pulsewidth modulation 600W+150W（PFC）Power amplifier module |
| CN107396245A (en) * | 2017-08-25 | 2017-11-24 | 东莞中拓机械技术开发有限公司 | A kind of pulsewidth modulation 700W+700W (PFC) power amplifier module |
| CN107396245B (en) * | 2017-08-25 | 2023-12-22 | 东莞精恒电子有限公司 | Pulse width modulation 700W+700W (PFC) power amplifier module |
| CN111512544A (en) * | 2017-12-20 | 2020-08-07 | 杜比实验室特许公司 | Configurable modal amplifier system |
| CN111512544B (en) * | 2017-12-20 | 2023-11-24 | 杜比实验室特许公司 | Configurable modal amplifier system |
| CN111541430A (en) * | 2020-05-21 | 2020-08-14 | 张金路 | Compound series digital power amplifier |
| CN115134709B (en) * | 2022-09-01 | 2023-01-10 | 宏晶微电子科技股份有限公司 | Signal processing method and device and electronic equipment |
| CN115134709A (en) * | 2022-09-01 | 2022-09-30 | 宏晶微电子科技股份有限公司 | Signal processing method and device and electronic equipment |
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