WO2011001591A1 - D級増幅装置 - Google Patents
D級増幅装置 Download PDFInfo
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- WO2011001591A1 WO2011001591A1 PCT/JP2010/003377 JP2010003377W WO2011001591A1 WO 2011001591 A1 WO2011001591 A1 WO 2011001591A1 JP 2010003377 W JP2010003377 W JP 2010003377W WO 2011001591 A1 WO2011001591 A1 WO 2011001591A1
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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
- H03F3/217—Class D power amplifiers; Switching amplifiers
- H03F3/2173—Class D power amplifiers; Switching amplifiers of the bridge type
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- 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
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- 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
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
- H03F1/3205—Modifications of amplifiers to reduce non-linear distortion in field-effect transistor amplifiers
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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
- H03F3/24—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages
- H03F3/245—Power amplifiers, e.g. Class B amplifiers, Class C amplifiers of transmitter output stages with semiconductor devices only
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- the present invention relates to a class D amplifier that obtains good audio characteristics by setting a dead time for a pair of switching elements and varying the dead time according to the state of an input signal.
- An output PWM signal is input to a low-pass filter (LPF) and demodulated into an analog audio signal to reproduce audio.
- LPF low-pass filter
- a high-speed switching element such as a MOS field effect transistor having a high side disposed on the high-potential power supply side and a low-side power supply (or ground) side of the half bridge circuit is used at the rising and falling of switching.
- a delay occurs due to the input capacitance characteristics and variations of the elements. For this reason, in order to reduce the through current caused by the paired switching elements being simultaneously turned ON, both the rising and falling edges of the switching element driving PWM signal input to the gates of the high-side and low-side switching elements The dead time was intentionally set so that is turned off.
- dead time control is used to control the through current that flows through the bridge circuit during high-volume playback while suppressing distortion of the playback signal during low-volume playback by flexibly controlling the dead time.
- the unit is linked to the volume control unit, and linked to the volume position control of the volume control unit so that the dead time is reduced when the volume control unit is set to low volume playback, and the dead time is set to be set to high volume playback.
- a digital switching amplifier that performs control so as to increase (see Patent Document 1, for example).
- the present invention has been made to solve the conventional problems, and an object of the present invention is to provide a class D amplification device capable of minimizing dead time and reducing distortion while suppressing the amount of heat generated by a through current. To do.
- the class D amplifying device of the present invention includes a bridge circuit composed of a plurality of switching elements, and controls the switching elements of the bridge circuit to switch the DC power supply voltage so that the audio signal input to the own device can be powered.
- a class-D amplifying device for amplifying includes a control unit that sets a dead time of a signal for switching the switching element and a voltage value of the DC power supply voltage in accordance with an input signal level of the input audio signal have.
- the class D amplifier of the present invention includes a bridge circuit composed of a plurality of switching elements, and controls the switching elements of the bridge circuit to switch the DC power supply voltage so that the audio signal input to the own apparatus is obtained.
- a class D amplification device that amplifies power, the dead time of the signal for switching the switching element and the voltage value of the DC power supply voltage are set according to the volume adjustment information for adjusting the output signal level output from the device itself It has the structure provided with the control part to do.
- the class D amplifying device of the present invention includes a bridge circuit composed of a plurality of switching elements, and controls the switching elements of the bridge circuit to switch the DC power supply voltage and to input the audio signal input to the own apparatus.
- a control unit that sets a voltage level of the DC power supply voltage according to an input signal level of the input audio signal, and the switching according to an output voltage level of the DC power supply voltage
- a conversion control unit for setting a dead time of a signal for switching the element.
- This configuration makes it possible to reduce the amount of heat generated by the switching element by reducing the DC power supply voltage value at the time of a small input signal level, and to select a small dead time with a value associated with the DC power supply voltage value. Thus, the distortion rate can be improved.
- the present invention provides a control unit that sets the dead time of the signal for switching the switching element and the output voltage value of the DC power supply voltage in accordance with the input signal level of the audio signal, so that the DC voltage is reduced particularly at a small input signal level.
- reducing the power supply voltage value it is possible to suppress the amount of heat generated by the switching element, and by selecting a small dead time with a value related to the DC power supply voltage value, the distortion can be improved and high sound quality can be achieved. It is possible to provide a class D amplifying device that achieves both high efficiency and high efficiency.
- Block diagram of a class D amplifier according to the first embodiment of the present invention The figure which shows the data table information in the 1st Embodiment of this invention
- the figure which shows the data table information in the 1st Embodiment of this invention The figure which shows the data table information in the 1st Embodiment of this invention Circuit diagram for explaining a dead time generation method in the first embodiment of the present invention
- the block diagram of the class D amplifier which shows the other example in the 1st Embodiment of this invention Block diagram of a class D amplifier according to the second embodiment of the present invention
- the block diagram of the class D amplifier which shows the other example in the 2nd Embodiment of this invention Block diagram of a class D amplifier according to the third embodiment of the present invention
- the block diagram of the class D amplifier which shows the other example in the 3rd Embodiment of this invention
- FIG. 1 shows a class D amplifier according to the first embodiment of the present invention.
- a class D amplifier 10 includes a PWM converter 101 that converts an analog audio signal input from an external device such as a CD player or a DVD player into a PWM signal, and a signal level of the input audio signal.
- the input signal level detection unit 102 outputs the input signal level information, the input signal level information output from the input signal level detection unit 102 is input, and the control unit 103 performs various controls corresponding to the input information, and the control unit
- the variable power supply unit 104 that supplies power to the high-speed switching element at a voltage level that is variably controlled following the target voltage information output from the 103, and the PWM signal following the target dead time information output from the control unit 103
- a dead time generation unit 105 that controls to set a dead time in
- a driver unit 106 that drives a high-speed switching element by a switching element driving PWM signal for which a dead time is set by the unit 105;
- a half-bridge circuit 107 that includes high-side and low-side high-speed switching elements 107a and
- the class D amplifier configured as described above will be described.
- an analog audio signal output from an external device connected to the class D amplifying apparatus 10 such as a television, a radio, a CD player, or a DVD player
- the PWM converter 101 inputs
- the modulated audio signal is subjected to PWM modulation, and a PWM signal is output.
- the input signal level detection unit 102 creates input signal level information including amplitude information of the input audio signal and outputs it to the control unit 103.
- the control unit 103 configured by a digital signal processor, a microcomputer, or the like corresponds to the input signal level information input from the input signal level detection unit 102 from the data table information set in the control unit 103 in advance.
- the target voltage information and the target dead time information are selected and the target voltage information, which is information indicating the target value of the voltage value to be set, is output to the variable power supply unit 104 and the dead time generation unit 105 is output.
- the target dead time information which is information indicating the target value of the dead time to be set, is output.
- a value required for preventing the switching elements 107a and 107b from being destroyed is a rise determined from physical characteristics such as input capacitance of the switching elements 107a and 107b. It is determined in consideration of the delay time of the waveform, the value of the output power supply voltage supplied to the element and the amount of heat generated by the switching element, and variations thereof.
- the above-mentioned data table information is based on the necessary dead time value thus determined so that the dead time is reduced while lowering the output power supply voltage at the time of the small input signal level, and the large input signal. At the level, the output power supply voltage is raised and the dead time is set to a large value.
- the target dead time information is in the form of unit time, resistance value, voltage value, etc., and can be selected in advance corresponding to the dead time generation method of the dead time generation unit 105. Good.
- the target dead time information is obtained by using a temperature detection element such as a thermistor (not shown) and corresponding to information such as the ambient temperature of the switching element as information that can be obtained by the control unit 103 from the temperature detection element. It is also possible to select and set such a coefficient. For example, in FIGS. 2 to 4, each value corresponding to the coefficient a may be selected when the ambient temperature is low, and each value corresponding to the coefficient b may be selected when the ambient temperature is high. Outputs the target dead time information set to the selected coefficient to the dead time generation unit 105.
- control unit 103 When the control unit 103 outputs the target voltage information selected from the data table information configured as described above to the variable power supply unit 104, the value of the output voltage variably controlled by the variable power supply unit 104 following the target voltage information. To supply power to the high-speed switching elements 107a and 107b.
- the dead time generation unit 105 performs control for setting the dead time in the PWM signal output from the PWM conversion unit 101 following the target dead time information input from the control unit 103.
- the dead time generation unit 105 converts the PWM signal output from the PWM conversion unit 101 into a switching element driving PWM signal for driving two (pairs) of switching elements 107a and 107b on the high side and the low side. To do.
- Two switching element driving PWM signals are input to respective filter circuits formed by a variable resistance element connected in series to the signal transmission line and a capacitor connected between the GND ground point. Due to the time constant of this filter circuit, a delay occurs at the time of rising. Since the diode connected in parallel with the variable resistance element is not affected by the resistance element at the time of falling, there is no delay due to the time constant. As a result, a timing shift due to delay occurs in the two switching element driving PWM signals of the high side and the low side, and a dead time is formed. The dead time value can be varied by changing the resistance value of the variable resistance element.
- the driver unit 106 performs switching control of the high-speed switching elements 107a and 107b corresponding to the switching element driving PWM signal for which the dead time is set.
- the half-bridge circuit 107 configured by NchMOS field effect transistors as the high-side and low-side high-speed switching elements 107a and 107b is an output PWM signal obtained by switching the variable output power supply voltage supplied from the variable power supply unit 104. Output to the low-pass filter unit 108.
- the output PWM signal passes through the low-pass filter unit 108 to be demodulated into an audio signal, and the speaker reproduces the audio by driving the demodulated audio signal.
- the control unit 103 selects the target voltage information and the target dead time information corresponding to the input audio signal level information from the data table information, and the variable power source unit 104
- the target voltage information is output to the output terminal, and the target dead time information associated with the target voltage information is output to the dead time generation unit 105, whereby the output power supply voltage and the dead time corresponding to the input audio signal level in the half bridge circuit 107 are output.
- the distortion rate can be improved by selecting a small dead time with a value associated with the value.
- the PWM converter 101 converts the digital audio input signal into a PWM signal as shown in FIG.
- the conversion unit can be implemented in the same manner as the above-described embodiment, and the same effect can be obtained.
- FIG. 7 shows a class D amplifier according to the second embodiment of the present invention.
- the second embodiment of the present invention is a volume for adjusting the magnitude of the output audio signal (output audio signal level) to be reproduced in the class D amplifier of FIG. 1 showing the first embodiment.
- An adjustment unit 201 is added to the configuration.
- the volume adjustment unit 201 outputs volume adjustment information represented by, for example, the number of steps to the control unit 103 as information for adjusting the magnitude of the output audio signal output from the own device.
- the control unit 103 selects target voltage information and target dead time information corresponding to volume information such as the number of steps input from the volume adjustment unit 201 from data table information preset in the control unit 103.
- the target voltage information is output to the variable power supply unit 104 and the target dead time information is output to the dead time generation unit 105.
- the data table information in the second embodiment described above is based on the necessary dead time value determined in the same manner as the value determined in the first embodiment, as shown in FIG.
- the target dead time information is not limited to the form using the resistance value as shown in FIG. 8, but uses a form such as unit time or voltage value.
- target voltage information and target dead time information corresponding to the volume information are selected from the data table information, and the target voltage information is output to the variable power supply unit 104, By outputting the target dead time information associated with the target voltage information to the dead time generation unit 105, the same effect as that of the first embodiment can be obtained.
- the control unit 103 selects target voltage information and target dead time information corresponding to volume information from the data table information, and supplies the target voltage to the variable power source unit 104.
- the output power supply voltage and the dead time corresponding to the volume information are realized in the half bridge circuit 107. According to this, it is possible to reduce the amount of heat generated by the high-speed switching element by lowering the output power supply voltage value, especially when the volume is selected to be small, and to correlate with the output power supply voltage value.
- the distortion rate can be improved by selecting a small dead time with the selected value.
- the PWM converter 101 when a digital audio signal such as PCM is input instead of an analog audio signal, the PWM converter 101 is replaced with a PCM-PWM converter 101a as shown in FIG. By doing so, it can be carried out in the same manner as in the above embodiment, and the same effect can be obtained.
- FIG. 3 shows a class D amplifier according to the third embodiment of the present invention.
- the third embodiment of the present invention is configured by adding a conversion control unit 301 for controlling conversion of output voltage information to target dead time information to the class D amplification device of FIG. 1 showing the first embodiment.
- the conversion control unit 301 includes a conversion circuit that converts output voltage information such as an output voltage value output from the variable power supply unit 104 into target dead time information corresponding to the output voltage, and a dead time generation unit For 105, the converted target dead time information is output.
- the conversion circuit is characterized in that the conversion is performed so as to maintain the relationship between the output voltage and data table information composed of target dead time information represented by, for example, a resistance value, and the output voltage is small.
- conversion control is performed from the output voltage value to the target dead time information so that the dead time is a small value and when the output voltage is large, the dead time is a large value.
- the target dead time information is not limited to the form using the resistance value as shown in FIG. 11, but uses a form such as unit time or voltage value. It is possible to select in advance according to the dead time generation method of the dead time generation unit 105, and further, the coefficient a, the coefficient b, the coefficient c, the coefficient d,. Is possible.
- the PWM converter 101 is replaced with a PCM-PWM converter 101a as shown in FIG.
- the present invention can be carried out in the same manner as the above embodiment, and the same effect can be obtained.
- the class D amplifying device can suppress the amount of heat generated by the switching element by reducing the DC power supply voltage value, particularly at the small input signal level, and the DC power supply voltage.
- the distortion rate can be improved, and both high sound quality and high efficiency are achieved, and as a class D amplifier that obtains good audio characteristics Useful.
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Abstract
Description
以下、本発明の第1の実施の形態のD級増幅装置について、図面を用いて説明する。
以下、本発明の第2の実施の形態のD級増幅装置について、図面を用いて説明する。
なお、第1の実施の形態と同様に、例えば、目標デッドタイム情報は、図8で示したような抵抗値を用いた形式に限定されず、単位時間や電圧値等の形式を用いるなどしてデッドタイム生成部105のデッドタイム生成方法に対応してあらかじめ選択することが可能であり、さらに、周囲温度に応じて係数a、係数bを使い分けることが可能である。
以下、本発明の第3の実施の形態のD級増幅装置について、図面を用いて説明する。
なお、第1の実施の形態と同様に、例えば、目標デッドタイム情報は、図11で示したような抵抗値を用いた形式に限定されず、単位時間や電圧値等の形式を用いるなどしてデッドタイム生成部105のデッドタイム生成方法に対応してあらかじめ選択することが可能であり、さらに、周囲温度に応じて係数a、係数b、さらには係数c、係数d・・・を使い分けることが可能である。
101 PWM変換部
101a PCM-PWM変換部
102 入力信号レベル検出部
103 コントロール部
104 可変電源部
105 デッドタイム生成部
106 ドライバ部
107 ハーフブリッジ回路
107a、107b スイッチング素子
108 LPF部
201 ボリューム調整部
301 変換制御部
Claims (10)
- 複数のスイッチング素子で構成されたブリッジ回路を備え、前記ブリッジ回路のスイッチング素子を制御することで直流電源電圧をスイッチングして自装置に入力された音声信号を電力増幅するD級増幅装置において、
前記入力された音声信号の入力信号レベルに応じて、前記スイッチング素子をスイッチ動作させる信号のデッドタイムおよび前記直流電源電圧の電圧値を設定するコントロール部を備えたことを特徴とするD級増幅装置。 - 複数のスイッチング素子で構成されたブリッジ回路を備え、前記ブリッジ回路のスイッチング素子を制御することで直流電源電圧をスイッチングして自装置に入力された音声信号を電力増幅するD級増幅装置において、
前記入力された音声信号の信号レベルを入力信号レベル情報として出力する入力信号レベル検出部と、前記入力された音声信号をPWM信号に変換して出力するPWM変換部と、前記PWM変換部が出力したPWM信号に対してデッドタイムを設定するデッドタイム生成部と、前記複数のスイッチング素子に対して電圧値を可変に電源供給する可変電源部と、前記入力信号レベル情報に基づいて目標電圧情報を設定して該目標電圧情報を前記可変電源部へ出力し、前記入力信号レベル情報に基づいて目標デッドタイム情報を設定して該目標デッドタイム情報をデッドタイム生成部へ出力するコントロール部とを備え、
前記デッドタイム生成部は、前記目標デッドタイム情報に対応したデッドタイムを前記PWM信号に対して設定し、前記可変電源部は前記目標電圧情報に対応した電圧値にて電源供給することを特徴とするD級増幅装置。 - 前記コントロール部は、前記入力された音声信号の入力信号レベルが小さくなるほど前記デッドタイムを小さく、なおかつ前記電源電圧を小さく設定し、前記入力された音声信号の入力信号レベルが大きくなるほど前記デッドタイムを多きく、なおかつ前記電源電圧を大きく設定することを特徴とした請求項1または請求項2に記載のD級増幅装置。
- 複数のスイッチング素子で構成されたブリッジ回路を備え、前記ブリッジ回路のスイッチング素子を制御することで直流電源電圧をスイッチングして自装置に入力された音声信号を電力増幅するD級増幅装置において、
自装置が出力する出力信号レベルを調整するためのボリューム調整情報に応じて、前記スイッチング素子をスイッチ動作させる信号のデッドタイムおよび前記直流電源電圧の電圧値を設定するコントロール部を備えたことを特徴とするD級増幅装置。 - 複数のスイッチング素子で構成されたブリッジ回路を備え、前記ブリッジ回路のスイッチング素子を制御することで直流電源電圧をスイッチングして自装置に入力された音声信号を電力増幅するD級増幅装置において、
自装置が出力する出力音声信号レベルを調整するためのボリューム調整情報を出力するボリューム調整部と、前記入力された音声信号をPWM信号に変換して出力するPWM変換部と、前記PWM変換部が出力したPWM信号に対してデッドタイムを設定するデッドタイム生成部と、前記複数のスイッチング素子に対して電圧値を可変に電源供給する可変電源部と、前記ボリューム調整情報に基づいて目標電圧情報を設定して該目標電圧情報を前記可変電源部へ出力し、前記ボリューム調整情報に基づいて目標デッドタイム情報を設定して該目標デッドタイム情報をデッドタイム生成部へ出力するコントロール部とを備え、前記デッドタイム生成部は、前記目標デッドタイム情報に対応したデッドタイムを前記PWM信号に対して設定し、前記可変電源部は前記目標電圧情報に対応した電圧値にて電源供給することを特徴とするD級増幅装置。 - 前記コントロール部は、前記ボリューム調整情報が示す自装置の出力音声信号レベルが小さくなるほど前記デッドタイムを小さく、なおかつ前記電源電圧を小さく設定し、前記ボリューム調整情報が示す自装置の出力音声信号レベルが大きくなるほど前記デッドタイムを大きく、なおかつ前記電源電圧を大きく設定することを特徴とした請求項4または請求項5に記載のD級増幅装置。
- 複数のスイッチング素子で構成されたブリッジ回路を備え、前記ブリッジ回路のスイッチング素子を制御することで直流電源電圧をスイッチングして自装置に入力された音声信号を電力増幅するD級増幅装置において、
前記入力された音声信号の入力信号レベルに応じて、前記直流電源電圧の電圧レベルを設定するコントロール部と、前記直流電源電圧の出力電圧レベルに応じて前記スイッチング素子をスイッチ動作させる信号のデッドタイムを設定する変換制御部とを備えたことを特徴とするD級増幅装置。 - 複数のスイッチング素子で構成されたブリッジ回路を備え、前記ブリッジ回路のスイッチング素子を制御することで直流電源電圧をスイッチングして自装置に入力された音声信号を電力増幅するD級増幅装置において、
前記入力された音声信号の信号レベルを入力信号レベル情報として出力する入力信号レベル検出部と、前記入力された音声信号をPWM信号に変換して出力するPWM変換部と、前記PWM変換部が出力したPWM信号に対してデッドタイムを設定するデッドタイム生成部と、前記複数のスイッチング素子に対して電圧値を可変に電源供給する可変電源部と、前記入力信号レベル情報に基づいて目標電圧情報を設定して該目標電圧情報を前記可変電源部へ出力するコントロール部と、前記可変電源部から出力される出力電圧情報を目標デッドタイム情報に変換して該目標デッドタイム情報を前記デッドタイム生成部へ出力する変換制御部とを備え、
前記デッドタイム生成部は、前記目標デッドタイム情報に対応したデッドタイムを前記PWM信号に対して設定し、前記可変電源部は前記目標電圧情報に対応した電圧値にて電源供給することを特徴とするD級増幅装置。 - 前記入力された音声信号の入力信号レベルが小さくなるほど、前記コントロール部が前記電源電圧を小さく設定し且つ前記デッドタイムは小さく設定され、前記入力された音声信号の入力信号レベルが大きくなるほど前記コントロール部が前記電源電圧を大きく設定し且つ前記デッドタイムが大きく設定されることを特徴とした請求項7または請求項8に記載のD級増幅装置。
- 前記PWM変換部は、デジタル信号をPWM信号に変換する処理を行うことを特徴とした請求項1ないし請求項9のいずれか一項に記載のD級増幅装置。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP20100793769 EP2432119B1 (en) | 2009-06-29 | 2010-05-19 | Class d amplification device |
CN2010800289505A CN102460960A (zh) | 2009-06-29 | 2010-05-19 | D类放大装置 |
JP2011520751A JP5430025B2 (ja) | 2009-06-29 | 2010-05-19 | D級増幅装置 |
US13/381,223 US9077295B2 (en) | 2009-06-29 | 2010-05-19 | Class D amplification device |
Applications Claiming Priority (2)
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JP2009153392 | 2009-06-29 | ||
JP2009-153392 | 2009-06-29 |
Publications (1)
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WO2011001591A1 true WO2011001591A1 (ja) | 2011-01-06 |
Family
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Application Number | Title | Priority Date | Filing Date |
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PCT/JP2010/003377 WO2011001591A1 (ja) | 2009-06-29 | 2010-05-19 | D級増幅装置 |
Country Status (5)
Country | Link |
---|---|
US (1) | US9077295B2 (ja) |
EP (1) | EP2432119B1 (ja) |
JP (1) | JP5430025B2 (ja) |
CN (1) | CN102460960A (ja) |
WO (1) | WO2011001591A1 (ja) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2012187790A (ja) * | 2011-03-10 | 2012-10-04 | Seiko Epson Corp | 負荷駆動回路および流体噴射装置 |
JP2015126245A (ja) * | 2013-12-25 | 2015-07-06 | パナソニック株式会社 | 送信装置及び歪み補償方法 |
JP2018191295A (ja) * | 2017-05-11 | 2018-11-29 | インフィネオン テクノロジーズ オーストリア アクチエンゲゼルシャフト | 調整可能なゲート駆動のd級オーディオ増幅器 |
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DE102012104488A1 (de) | 2012-05-24 | 2013-11-28 | Hochschule für angewandte Wissenschaften München | Geschalteter Verstärker für variable Versorgungsspannung |
GB2537320A (en) | 2014-02-04 | 2016-10-12 | Cirrus Logic Inc | Switched mode amplifier |
US10812024B2 (en) | 2014-05-08 | 2020-10-20 | Cirrus Logic, Inc. | System with multiple signal loops and switched mode converter |
US9628033B2 (en) | 2014-10-29 | 2017-04-18 | Cirrus Logic, Inc. | Power stage with switched mode amplifier and linear amplifier |
US10373092B2 (en) * | 2015-09-08 | 2019-08-06 | Oracle International Corporation | System and method for providing a tradeoff between time and quality for a task |
US10218312B2 (en) | 2016-02-29 | 2019-02-26 | Qualcomm Incorporated | Dynamic volume management in audio amplifiers |
US20170250654A1 (en) * | 2016-02-29 | 2017-08-31 | Qualcomm Incorporated | Dynamic dead time management |
US10256777B2 (en) | 2016-02-29 | 2019-04-09 | Qualcomm Incorporated | Audio amplifiers |
JPWO2017154051A1 (ja) * | 2016-03-08 | 2019-01-17 | パナソニックIpマネジメント株式会社 | D級増幅器および音声再生装置 |
DE102017209067A1 (de) * | 2017-05-30 | 2018-12-06 | Robert Bosch Gmbh | Klasse-D-Verstärker und Betriebsverfahren |
JP7210343B2 (ja) | 2019-03-18 | 2023-01-23 | 株式会社東芝 | D級アンプ及び音響再生システム |
CN111510075B (zh) * | 2020-05-13 | 2024-03-08 | 维沃移动通信有限公司 | 一种功率放大器的电压调整方法、装置及电子设备 |
TWI757159B (zh) * | 2021-04-21 | 2022-03-01 | 瑞昱半導體股份有限公司 | 音訊處理電路 |
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- 2010-05-19 JP JP2011520751A patent/JP5430025B2/ja not_active Expired - Fee Related
- 2010-05-19 CN CN2010800289505A patent/CN102460960A/zh active Pending
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2012187790A (ja) * | 2011-03-10 | 2012-10-04 | Seiko Epson Corp | 負荷駆動回路および流体噴射装置 |
JP2015126245A (ja) * | 2013-12-25 | 2015-07-06 | パナソニック株式会社 | 送信装置及び歪み補償方法 |
JP2018191295A (ja) * | 2017-05-11 | 2018-11-29 | インフィネオン テクノロジーズ オーストリア アクチエンゲゼルシャフト | 調整可能なゲート駆動のd級オーディオ増幅器 |
JP7176859B2 (ja) | 2017-05-11 | 2022-11-22 | インフィネオン テクノロジーズ オーストリア アクチエンゲゼルシャフト | 調整可能なゲート駆動のd級オーディオ増幅器 |
Also Published As
Publication number | Publication date |
---|---|
EP2432119B1 (en) | 2015-04-01 |
US20120099743A1 (en) | 2012-04-26 |
JP5430025B2 (ja) | 2014-02-26 |
EP2432119A4 (en) | 2014-04-09 |
US9077295B2 (en) | 2015-07-07 |
EP2432119A1 (en) | 2012-03-21 |
JPWO2011001591A1 (ja) | 2012-12-10 |
CN102460960A (zh) | 2012-05-16 |
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