WO2006104075A1 - アンプ装置 - Google Patents
アンプ装置 Download PDFInfo
- Publication number
- WO2006104075A1 WO2006104075A1 PCT/JP2006/306091 JP2006306091W WO2006104075A1 WO 2006104075 A1 WO2006104075 A1 WO 2006104075A1 JP 2006306091 W JP2006306091 W JP 2006306091W WO 2006104075 A1 WO2006104075 A1 WO 2006104075A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- signal
- circuit
- amplifier
- speaker
- pwm signal
- Prior art date
Links
Classifications
-
- 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
- H03F3/217—Class D power amplifiers; Switching amplifiers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
- H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
- H03F1/0211—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the supply voltage or current
- H03F1/0216—Continuous control
- H03F1/0222—Continuous control by using a signal derived from the input signal
- H03F1/0227—Continuous control by using a signal derived from the input signal using supply converters
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/26—Modifications of amplifiers to reduce influence of noise generated by amplifying elements
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
- H03F1/303—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters using a switching device
-
- 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
- H03F3/217—Class D power amplifiers; Switching amplifiers
- H03F3/2173—Class D power amplifiers; Switching amplifiers of the bridge type
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/351—Pulse width modulation being used in an amplifying circuit
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/372—Noise reduction and elimination in amplifier
Definitions
- the present invention relates to an amplifier device used for a portable device or the like.
- a DD converter for boosting is frequently used in a power supply circuit in order to ensure a loud sound. Under such circumstances, it is required that the sound quality should be satisfied at the same time while ensuring a large volume.
- a D-class amplifier has been employed for amplifying audio in a portable device using a battery, and a battery voltage as a power source is boosted by using a DD converter in a power circuit.
- Various amplifier devices have been proposed (see, for example, JP-A-1-147907).
- FIG. 7 shows a time chart of this operation. Time progresses from the left side to the right side in Fig. 7, and the DD converter 25 is in a steady state on the left side.
- the output voltage 27 of the DD converter 25 is compared with the reference voltage 17 by the difference amplifier 16, and the clock is input separately so that the difference becomes "0".
- the switching element 13 is controlled by a PWM control circuit 15 synchronized with the circuit 28.
- the PWM signal becomes positive and the switching element 13 is turned on. Furthermore, the next clock rise At reset, the PWM signal becomes negative. At the moment when the PWM signal becomes negative, the switching element 13 is turned off, so that the energy stored in the inductor 12 is released so that a current flows in the reverse direction, and appears as an output voltage through the rectifier element 14. For this reason, the waveform of the output voltage is a waveform in which the voltage gradually decreases until just before the next clock when the voltage rises at the rising edge of the clock, and this waveform is defined as a ripple of the output voltage. Since the capacitor 18 is connected to the output voltage 27, the change is generally gentle.
- the PWM method is a control system that attempts to suppress the voltage drop by changing the time ratio of Ton and Toff by comparing the reduced voltage with the reference voltage 17 by the differential amplifier 16. In other words, in the PWM method, the output voltage 27 increases as the TonZToff ratio is increased and the pulse width is increased.
- the output voltage 27 has a gentle drop in voltage until the next clock, and the pulse width becomes narrow.
- a delay time such as a time until the voltage drop is detected by the differential amplifier 16 and a time until the force also controls the switching element 13 occurs. If the load current increases, it may decrease temporarily. If the load current decreases suddenly, the output voltage 27 may rise temporarily.
- the present invention uses a signal proportional to the duty of the PWM signal of the amplifier unit that drives the speaker as the PWM signal of the power circuit unit, so that even when the amplifier unit outputs a loud sound, the output capacity of the power source It is an object of the present invention to provide an amplifier device that can increase the frequency at the same timing, thereby reducing fluctuations in the power supply output voltage and reducing the distortion of the sound rise.
- the present invention is an amplifier device including an amplifier unit that receives an input signal and drives a speaker, and a power supply circuit unit that supplies an output voltage to the amplifier unit, the amplifier unit including an input signal A PWM signal generating circuit for converting the signal into a PWM signal, a speaker driving circuit for driving the speaker power based on the PWM signal, a duty detection circuit for outputting a pulse width signal depending on the pulse width of the PWM signal, And the power supply circuit unit includes a PWM control circuit that controls the output voltage based on the pulse width signal.
- the PWM control circuit of the power supply circuit unit causes the output voltage of the power supply circuit to be based on the pulse width signal that depends on the pulse width of the PWM signal of the amplifier unit that drives the speaker.
- the pulse width signal depends on a signal that depends on the difference between the pulse width of a PWM pulse and the interval between each pulse and an adjacent pulse, or on a duty ratio that is a ratio between the pulse width and the pulse interval. It is preferable to employ a signal.
- the signal that depends is preferably a signal that monotonously increases with an increase in the pulse width indicated by the pulse width signal, for example, a proportional signal.
- FIG. 1 is a block diagram of an amplifier device according to a first embodiment.
- FIG. 2 is a time chart showing the output operation of the PWM signal generation circuit of the same D-class amplifier.
- FIG. 3 is a time chart showing the output operation of the low-pass filter of the same D-class amplifier.
- FIG. 4 is a time chart of the same duty detection circuit.
- FIG. 5 is a block diagram of an amplifier device according to a second embodiment.
- FIG. 6 is a block diagram of a DD converter that is a power supply circuit unit of a conventional amplifier device.
- FIG. 7 is a time chart showing the operation of the DD converter of FIG.
- FIG. 1 is a block diagram showing a first embodiment of the amplifier device of the present invention.
- the present invention is an amplifier device including an amplifier unit 26 that receives an input signal and drives a speaker, and a power supply circuit unit 25 that supplies a power supply voltage to the amplifier unit 26.
- the amplifier unit 26 includes: A PWM signal generation circuit 4 that converts an input signal into a PWM signal; and a duty detection circuit 8 that outputs a signal proportional to the time difference component of the PWM signal. A signal is input, and a PWM control circuit 15 that controls the power supply output voltage based on this signal is provided.
- a PWM D-class amplifier 26 is used as an amplifier unit for driving the speaker 23.
- the analog signal 21 input to the D-class amplifier 26 is input to the differential amplifier 1, and the signal input to the speaker 23 is also input to the differential amplifier 1 for feedback control.
- the output signal of the differential amplifier 1 is input to the comparator 2 and compared with the triangular wave generated in the triangular wave generating circuit 3 based on the separately input clock 22 signal by the comparator 2, and the PWM signal is output from the comparator 2.
- the comparator 2 and the triangular wave generator circuit constitute the PMW signal generator circuit 4.
- the PWM signal output from the comparator 2 drives the constant voltage switching circuits 5 and 9, and the PMW signal is a difference output between the on time (Ton) and the off time (Toff).
- the signal is also input to a duty detection circuit 8 that outputs a signal proportional to, and converted to a signal proportional to the time difference.
- the output signal from the duty detection circuit 8 is input to the PMW control circuit 15 of the DD converter 25, which is the power supply circuit section that supplies power to the D class amplifier 26. Signal to control the output voltage of DD converter 25.
- a generally used full-bridge connection PWM D-class amplifier 26 is used, and the PWM signal for driving the constant voltage switching circuit 5 is branched into two in the full-bridge method. One of them is inverted in phase through the phase inversion circuit 7 and drives the constant voltage switching circuit 9 so that the constant voltage switching circuits 5 and 9 are in opposite phases.
- the outputs of the constant voltage switching circuits 5 and 9 are connected to the low-pass filters 6 and 10, respectively, to remove noise such as clock components and drive the speaker 23.
- a PWM drive boost type DD converter 25 is used as a power supply circuit section for supplying power to the D-class amplifier 26.
- the power supply voltage supplied from the battery 11 is supplied to the switching element 13 via the inductor 12.
- the PWM signal generated by the D class amplifier 26 is converted into a signal proportional to the time difference output between Ton and Toff by the duty detection circuit 8, and the switching element 13 is driven through the PWM control circuit 15. Since the voltage output from the rectifying element 14 connected to the output side of the inductor 12 includes a ripple, the voltage is smoothed by the capacitor 18 to obtain an output voltage 27.
- the DD converter 25 which is the power circuit, can be driven by a signal directly linked to the level of the input signal of the D-class amplifier 26 that drives the speaker 23. Therefore, the rise of the DD converter 25 is accelerated. be able to. For this reason, the DD converter 25 can improve the drop in the power supply voltage against a sudden increase in load current.
- the input analog signal 21 is input to the differential amplifier 1, and the difference from the feedback control signal is passed to the PWM signal generation circuit 4.
- This feedback control controls the gain of the entire amplifier circuit and acts to reduce the occurrence of distortion.
- the PWM signal generation circuit 4 includes a comparator 2 and a triangular wave generation circuit 3, and outputs a PWM signal in a time chart as shown in FIG. That is, with the clock 22 as a reference, the analog input signal that is the output signal of the differential amplifier 1 and the output signal of the triangular wave generation circuit 3 Compare the levels of certain triangular signals.
- the output of the comparator 2 is a positive signal when the analog input signal is larger than the triangular wave signal, and a "negative signal" when the analog input signal is smaller than the triangular wave signal.
- This is a PWM signal with a pulse width proportional to the voltage of the input signal, where clock 22 is set to a frequency sufficiently higher than the maximum frequency of the analog signal input as a sampling clock.
- Triangular wave generation circuit 3 generates a triangular wave signal.
- the PWM signal output from the PWM signal generation circuit 4 is divided into a signal that passes through a phase inversion circuit 7 that generates a signal that is 180 degrees out of phase, and a signal that does not pass through it. 9 and the low-pass filters 6 and 10 are converted to analog signals again, and the speakers are driven in the opposite phase. This operation is shown in the time chart of Figure 3.
- the PWM signal power based on the clock 22 is input to the constant voltage switching circuit 5 to obtain sufficient power for driving the speaker 23, and the clock component is removed from the signal by the low-pass filter 6.
- the analog voltage level is proportional to the pulse width time
- the analog signal is proportional to the input signal 21 level.
- the phase-inverted PWM signal is input to the constant voltage switching circuit 9 to obtain enough power to drive the speaker 23, and when the signal is filtered by the low-pass filter 10, the input signal 2 Level 1 is proportional to the analog signal with the phase reversed.
- the driving method of the speaker 23 is generally adopted as a full-bridge connection, and a large output can be expected even at a low power supply voltage, and an output coupling capacitor having a high power supply utilization rate can be omitted. There are many advantages. However, as a driving method of the speaker 23, in addition to the full-bridge connection method, a half-bridge connection with a set of constant voltage switching circuits can be applied.
- the PWM signal output from the PWM signal generation circuit 4 is further sent to the duty detection circuit 8.
- the duty detection circuit 8 In this circuit, as shown in the time chart of Fig. 4, within the time from the rising edge of the clock to the next rising edge, the time difference between Ton and Toff of the PWM signal generating circuit 4 is output. Outputs a proportional signal. In fact, this It is necessary to add a coefficient to the signal and adjust the power supply voltage from the DD converter to output an appropriate voltage when the sound from the speaker is loud.
- DD converter 25 that is a power supply circuit section will be described.
- the input voltage from the battery 11 is connected to the switching element 13 and the rectifying element 14 through the inductor 12, and the switching element 13 is controlled for a time controlled by the PWM control circuit 15.
- the DD converter 25 outputs a voltage proportional to the Ton and Toff of the switching element 13 with respect to the input voltage from the battery 11.
- the output voltage is smoothed by the capacitor 18, and ripples due to switching are reduced, and control is performed so as to maintain an almost constant average voltage.
- the DD converter 25 is automatically switched to the PFM control system in which the duty is fixed and the frequency of the control clock is variable, and the efficiency of the DD converter 25 is improved.
- a method for preventing the decrease is employed.
- the PFM control method is a pulse frequency modulation control method that changes the frequency without changing the pulse duty.
- FIG. 5 shows a second embodiment of the present invention.
- FIG. 5 shows an example in which a PWM signal is generated by using a ⁇ modulation circuit 30 in the D class amplifier 26. Even if the digital signal is composed of a plurality of bits, if the difference is converted into a PWM signal by the duty detection circuit 8, it can be used as it is.
- the input signal can be a digital signal or an analog signal!
- the amplifier device of the present embodiment drives the speaker 23 using the D class amplifier 26.
- a device that boosts the voltage of the battery 11 with the DD converter 25 and uses it as a power source for example, a mobile terminal device such as a mobile phone, PHS, PDA, etc., and outputs sound from a speaker. It can be applied to any device with functions.
- the present invention is based on the preferred embodiments.
- the amplifier device of the present invention is not limited only to the configuration of the above-described embodiment example, and the configuration force of the above-described embodiment example is also subject to various modifications and changes. Included in the range.
- a signal proportional to the time difference signal of the PWM signal is used.
- the present invention is not limited to this, and the pulse width signal may be the duty ratio of the PWM pulse in addition to the time difference signal of the PWM pulse.
- the signal is not limited to a proportional signal as long as it is a signal that increases monotonously as the pulse width of the PWM pulse increases.
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/817,361 US20090022339A1 (en) | 2005-03-28 | 2006-03-27 | Amplifier |
EP06730039A EP1865597B1 (en) | 2005-03-28 | 2006-03-27 | Amplifier apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2005-091892 | 2005-03-28 | ||
JP2005091892A JP2008047945A (ja) | 2005-03-28 | 2005-03-28 | アンプ装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006104075A1 true WO2006104075A1 (ja) | 2006-10-05 |
Family
ID=37053333
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2006/306091 WO2006104075A1 (ja) | 2005-03-28 | 2006-03-27 | アンプ装置 |
Country Status (5)
Country | Link |
---|---|
US (1) | US20090022339A1 (ja) |
EP (1) | EP1865597B1 (ja) |
JP (1) | JP2008047945A (ja) |
CN (1) | CN101151799A (ja) |
WO (1) | WO2006104075A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114071338A (zh) * | 2020-08-03 | 2022-02-18 | 知微电子有限公司 | 具有回收能量能力的驱动电路及其方法 |
Families Citing this family (15)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2009225391A (ja) * | 2008-03-19 | 2009-10-01 | Sanyo Electric Co Ltd | 音声再生システム |
US20090274321A1 (en) * | 2008-04-30 | 2009-11-05 | Lear Corporation | Audio amplifier and technique for power efficiency thereof |
KR101650812B1 (ko) * | 2009-03-03 | 2016-08-24 | 삼성전자주식회사 | 하프-브릿지 3-레벨 pwm 증폭기 및 그 구동 방법 |
CN102073040B (zh) * | 2009-11-20 | 2014-02-12 | 建兴电子科技股份有限公司 | 超音波感测器的控制方法 |
JPWO2011125261A1 (ja) * | 2010-04-09 | 2013-07-08 | 住友電気工業株式会社 | 増幅回路及び無線通信装置 |
CN102142815A (zh) * | 2010-07-09 | 2011-08-03 | 启攀微电子(上海)有限公司 | 一种基于Class-D的多电源切换调制方法及电路 |
FR2966993B1 (fr) * | 2010-10-29 | 2012-11-02 | Cddic | Amplificateur audio class-d pwm combine avec un convertisseur dcdc boost ou une pompe de chaleur |
FR2966994B1 (fr) * | 2010-11-02 | 2018-01-26 | Cddic | Amplificateur audio class-d pwm combine avec un elevateur de tension et avec controle de dissipation. |
JP5721403B2 (ja) * | 2010-11-18 | 2015-05-20 | ルネサスエレクトロニクス株式会社 | 昇降圧回路及び昇降圧回路制御方法 |
EP2744103A1 (en) | 2012-12-13 | 2014-06-18 | Dialog Semiconductor GmbH | Boosted differential Class H Amplifier |
TWI548198B (zh) * | 2015-06-03 | 2016-09-01 | 陳正一 | 可程式化電力品質訊號產生器 |
US10153795B1 (en) * | 2018-02-20 | 2018-12-11 | Nxp B.V. | Switching amplifier circuit with amplitude control |
CN108809261A (zh) * | 2018-06-30 | 2018-11-13 | 国网江苏省电力有限公司连云港供电分公司 | 用于pzt多层堆叠执行器的新型高速电流控制放大器 |
CN112770225A (zh) * | 2021-02-04 | 2021-05-07 | 广东交通职业技术学院 | 一种声音功放***及控制方法 |
CN115278473A (zh) * | 2022-07-27 | 2022-11-01 | 重庆电子工程职业学院 | 一种蓝牙立体声*** |
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JPH09148851A (ja) * | 1995-11-17 | 1997-06-06 | Matsushita Electric Ind Co Ltd | オーディオ用スイッチング電源 |
JP2004356963A (ja) * | 2003-05-29 | 2004-12-16 | Mitsubishi Electric Corp | D級増幅器 |
JP2005012868A (ja) * | 2003-06-17 | 2005-01-13 | Tohoku Pioneer Corp | 電源装置および電圧変換方法 |
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JPS6139708A (ja) * | 1984-07-31 | 1986-02-25 | Akai Electric Co Ltd | パルス幅変調アンプにおける電源電圧変動補正方法 |
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JP2844479B2 (ja) * | 1989-11-17 | 1999-01-06 | 富士通テン株式会社 | スイッチングアンプの電源変動補償回路 |
CA2109755C (en) * | 1993-11-23 | 2004-11-02 | John Barry French | Composite bridge amplifier with output overload and thermal protection |
JP2591466B2 (ja) * | 1994-04-13 | 1997-03-19 | 日本電気株式会社 | 電力増幅回路 |
JP2002151978A (ja) * | 2000-11-10 | 2002-05-24 | Ad Main Inc | 絶縁型pwm電力増幅器 |
EP1427101A4 (en) * | 2001-09-04 | 2006-05-17 | Shindengen Electric Mfg | CIRCUIT GAIN DEVICE |
US7205834B2 (en) * | 2002-07-18 | 2007-04-17 | Sony Corporation | Power amplifier |
US7049885B2 (en) * | 2002-07-29 | 2006-05-23 | Sharp Kabushiki Kaisha | Volume adjustment device, digital amplifier, and digital signal reproducing device |
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JP2004180294A (ja) * | 2002-11-15 | 2004-06-24 | Matsushita Electric Ind Co Ltd | 電力増幅装置 |
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2005
- 2005-03-28 JP JP2005091892A patent/JP2008047945A/ja active Pending
-
2006
- 2006-03-27 WO PCT/JP2006/306091 patent/WO2006104075A1/ja active Application Filing
- 2006-03-27 US US11/817,361 patent/US20090022339A1/en not_active Abandoned
- 2006-03-27 EP EP06730039A patent/EP1865597B1/en not_active Expired - Fee Related
- 2006-03-27 CN CNA2006800100056A patent/CN101151799A/zh active Pending
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JPH09148851A (ja) * | 1995-11-17 | 1997-06-06 | Matsushita Electric Ind Co Ltd | オーディオ用スイッチング電源 |
JP2004356963A (ja) * | 2003-05-29 | 2004-12-16 | Mitsubishi Electric Corp | D級増幅器 |
JP2005012868A (ja) * | 2003-06-17 | 2005-01-13 | Tohoku Pioneer Corp | 電源装置および電圧変換方法 |
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Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN114071338A (zh) * | 2020-08-03 | 2022-02-18 | 知微电子有限公司 | 具有回收能量能力的驱动电路及其方法 |
Also Published As
Publication number | Publication date |
---|---|
EP1865597A4 (en) | 2009-10-28 |
EP1865597B1 (en) | 2011-08-03 |
US20090022339A1 (en) | 2009-01-22 |
EP1865597A1 (en) | 2007-12-12 |
JP2008047945A (ja) | 2008-02-28 |
CN101151799A (zh) | 2008-03-26 |
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