WO2014208042A1 - Dispositif de commande de sortie vocale véhiculaire - Google Patents

Dispositif de commande de sortie vocale véhiculaire Download PDF

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Publication number
WO2014208042A1
WO2014208042A1 PCT/JP2014/003218 JP2014003218W WO2014208042A1 WO 2014208042 A1 WO2014208042 A1 WO 2014208042A1 JP 2014003218 W JP2014003218 W JP 2014003218W WO 2014208042 A1 WO2014208042 A1 WO 2014208042A1
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WO
WIPO (PCT)
Prior art keywords
frequency
temperature
frequency band
reference clock
signal
Prior art date
Application number
PCT/JP2014/003218
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English (en)
Japanese (ja)
Inventor
剛 塩見
Original Assignee
株式会社デンソー
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Filing date
Publication date
Application filed by 株式会社デンソー filed Critical 株式会社デンソー
Publication of WO2014208042A1 publication Critical patent/WO2014208042A1/fr

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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
    • 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
    • H03F1/52—Circuit arrangements for protecting such amplifiers
    • H03F1/523—Circuit arrangements for protecting such amplifiers for amplifiers using field-effect devices
    • 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
    • H03F3/2175—Class D power amplifiers; Switching amplifiers using analogue-digital or digital-analogue conversion
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/447—Indexing scheme relating to amplifiers the amplifier being protected to temperature influence
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/468—Indexing scheme relating to amplifiers the temperature being sensed

Definitions

  • the present disclosure relates to a vehicular audio output control apparatus that generates a pulse width modulation signal by following a frequency of a reference clock to generate a pulse width modulation signal and amplifies and outputs the generated pulse width modulation signal.
  • the digital amplifier follows the frequency of the reference clock to convert the audio signal into PWM (Pulse Width Modulation) and generates a PWM signal.
  • PWM Pulse Width Modulation
  • the PWM signal input from the PWM converter is amplified by the switching element and output. And an amplifying unit. If the temperature of the amplifier section is likely to exceed the guaranteed operating temperature due to a temperature increase due to switching loss of the switching element in a high temperature environment, conventionally, a simple on / off operation is performed to stop the output of the audio signal for the purpose of component protection. It was off control. In this case, there is no particular problem even if the output is stopped as long as the audio signal does not affect the safety and safety of driving such as music.
  • switching loss can be reduced in order to suppress the temperature rise of the amplification section.
  • a switching frequency is variable according to a broadcast genre, and a frequency band of an audio signal is narrow like news. In some cases, a technique for reducing unnecessary switching loss is disclosed.
  • Patent Document 1 can only suppress the temperature rise of the amplification section by reducing the switching loss, and can protect the parts in a high temperature environment and ensure the safety and safety of operation. It does not lead to coexistence with.
  • the present disclosure has been made in view of the above-described circumstances, and an object of the present disclosure is to provide a vehicle audio output control device capable of achieving both protection of components in a high temperature environment and ensuring of driving safety and safety. Is to provide.
  • the signal processing means limits the pass frequency band of the audio signal.
  • the reference clock output means outputs a reference clock.
  • the pulse width modulation unit When the audio signal is input from the signal processing unit, the pulse width modulation unit generates a pulse width modulation signal by performing pulse width modulation on the input audio signal following the frequency of the reference clock input from the reference clock output unit. The generated pulse width modulation signal is output.
  • the amplifying means having the switching element amplifies the pulse width modulation signal input from the pulse width modulating means by the switching element.
  • the temperature detection means detects a detection temperature that reflects at least the temperature of the amplification means.
  • the control means sets the pass frequency band of the audio signal in the signal processing means and the frequency of the reference clock output from the reference clock output means in accordance with the detected temperature detected by the temperature detection means.
  • the frequency of the reference clock is set according to the detection temperature reflecting the temperature of the amplification means, the frequency of the reference clock is decreased at the time of high-temperature operation in a high temperature environment compared with the time of normal operation.
  • the switching frequency can be reduced as compared with the normal operation. Since the switching loss is proportional to the switching frequency, the switching loss can be reduced more than that during normal operation by lowering the switching frequency than during normal operation. As a result, the temperature rise of the amplifying means can be suppressed as compared with the normal operation, and the parts can be protected.
  • the vehicular audio output control device 1 controls output of audio signals such as music in the passenger compartment and a warning sound to the driver while being mounted on the vehicle.
  • the warning sound informs the driver of cautions when driving such as the possibility that the own vehicle may collide with the vehicle ahead and that there is a traffic jam on the route on which the own vehicle travels. It is voice.
  • the vehicle audio output control device 1 controls the output of a warning sound in cooperation with an ECU (Electronic Control Unit) having a navigation function and an ECU having a collision prevention function.
  • ECU Electronic Control Unit
  • the vehicle audio output control device 1 includes an audio generation unit 2, a signal processing unit 3 (corresponding to a signal processing unit), a PWM (Pulse Width Modulation) conversion unit 4 (corresponding to a pulse width modulation unit), and an amplification unit 5 (Corresponding to amplification means), integrator section 6, control section 7 (reference clock output means, corresponding to control means), and temperature detection section 8 (corresponding to temperature detection means).
  • the PWM converter 4, the amplifier 5, and the integrator 6 constitute a digital amplifier 9. Note that the vehicle audio output control device 1 switches between an activated state and a stopped state in conjunction with, for example, turning on / off an accessory switch.
  • the sound generation unit 2 functions as a sound source, generates music, a warning sound for the driver, and the like as a sound signal, and outputs the generated sound signal to the signal processing unit 3.
  • the configuration in which the audio generation unit 2 is incorporated in the vehicle audio output control device 1 is described.
  • the audio generation unit 2 is provided outside the vehicle audio output control device 1. It may be a configuration (externally attached).
  • the signal processing unit 3 is a low-pass filter (LPF: Low-pass filter) that cuts (does not pass) a frequency component higher than the cutoff frequency, and determines the cutoff frequency based on an on signal or an off signal input from the control unit 7. Switching, the pass frequency band of the audio signal is selectively switched between the first frequency band and the second frequency band. That is, when the off signal is input from the control unit 7, the signal processing unit 3 sets the pass frequency band of the audio signal to the first frequency band. When the audio signal is input from the audio generation unit 2 in a state where the pass frequency band of the audio signal is set to the first frequency band, the signal processing unit 3 sets the pass frequency band of the input audio signal to the first frequency.
  • LPF Low-pass filter
  • the output is limited to the band and output to the PWM converter 4.
  • the signal processing unit 3 receives the ON signal from the control unit 7, the signal processing unit 3 shifts the cutoff frequency to the low band side and prohibits the passage of the audio signal on the high frequency side of the first frequency band. 2 frequency band.
  • the signal processing unit 3 sets the pass frequency band of the input audio signal to the second frequency.
  • the output is limited to the band and output to the PWM converter 4.
  • the first frequency band is a frequency band including at least a frequency band of music (music band) and a warning sound frequency band (warning sound band).
  • the second frequency band is narrower than the first frequency band and does not include the high frequency side of the music frequency band, but includes at least the warning sound frequency band.
  • the PWM conversion unit 4 When an audio signal is input from the signal processing unit 3, the PWM conversion unit 4 performs PWM conversion by causing the amplitude change of the input audio signal to correspond to the pulse width of the reference clock input from the control unit 7, thereby generating a square wave. A PWM signal is generated, and the generated PWM signal is output to the amplifying unit 5.
  • the control unit 7 switches the frequency of the reference clock between the first frequency (f1) and the second frequency (f2) lower than the first frequency, as will be described later, and the PWM conversion unit 4 Output to.
  • the PWM conversion unit 4 converts the input audio signal into the reference clock having the first frequency.
  • PWM conversion to generate a PWM signal when the PWM conversion unit 4 inputs an audio signal from the signal processing unit 3 while the reference clock is input from the control unit 7 at the second frequency, the input audio signal is converted to the reference clock of the second frequency. PWM conversion to generate a PWM signal.
  • the amplifying unit 5 includes a negative logic circuit 11, N-type MOSFETs (Metal-Oxide-Semiconductor-Field-Effect-Transistors) 12, 13 that are half-bridge connected as two switching elements, And an FET driver 14 for driving the two FETs 12 and 13.
  • the amplification unit 5 receives the PWM signal from the PWM conversion unit 4, the amplification unit 5 generates two PWM signals having opposite polarities from the input PWM signal, and alternately turns on / off the two FETs 12 and 13 to thereby change the amplitude. Is generated (voltage and current amplification) and is output to the integrator unit 6.
  • the switching loss due to the two FETs 12 and 13 being alternately turned on / off is proportional to the switching frequency. That is, the switching loss is relatively large when the PWM conversion unit 4 is inputting the reference clock from the control unit 7 at the first frequency, while the PWM conversion unit 4 receives the second reference clock from the control unit 7. It is relatively small when input at a frequency of.
  • the integrator unit 6 includes a coil 15 and a capacitor 16 as shown in FIG.
  • the integrator unit 6 receives the PWM signal from the amplification unit 5
  • the integrator unit 6 converts the input PWM signal into an audio signal and outputs it to the speaker 10.
  • the speaker 10 is disposed at a predetermined part of the vehicle.
  • an audio signal is input from the integrator unit 6 (digital amplifier 9)
  • the speaker 10 converts the audio signal into vibration and outputs audio.
  • the temperature detection unit 8 is disposed inside a housing (not shown) that houses the signal processing unit 3 and the digital amplifier 9 described above, and reflects the ambient temperature inside the housing (the temperature of the amplification unit 5 is reflected). Temperature) can be detected.
  • the temperature detection unit 8 outputs the detected ambient temperature inside the housing to the control unit 7 as a detection temperature.
  • the control unit 7 includes a known microcomputer having a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), an I / O (Input / Output) bus, and the like.
  • the control unit 7 switches and controls the frequency of the reference clock output to the PWM conversion unit 4 according to the detected temperature input from the temperature detection unit 8 in accordance with a computer program stored in a ROM or the like, and a signal processing unit. The output of the on signal or the off signal to 3 is switched.
  • the control unit 7 When the vehicle audio output control device 1 is in the activated state, the control unit 7 periodically executes the temperature detection routine shown in FIG. When the vehicle audio output control device 1 is activated, the control unit 7 sets the frequency of the reference clock to the first frequency and outputs (resets) the off signal to the signal processing unit 3. When starting the temperature detection routine, the control unit 7 determines the detection temperature input from the temperature detection unit 8, and determines whether or not the detection temperature is equal to or higher than the first set temperature (S1).
  • the first set temperature is a temperature slightly lower than the operation guarantee temperature for component protection, and is written in the computer program at the stage when the vehicle audio output control device 1 is manufactured, for example.
  • the control unit 7 determines that the detected temperature is not equal to or higher than the first set temperature (S1: NO). The detection routine is terminated and the next temperature detection routine is awaited.
  • the vehicular audio output control device 1 executes a process of outputting music or a warning sound
  • the two FETs 12 and 13 are alternately turned on / off repeatedly in the amplifier 5, the temperature rises due to switching loss.
  • the control unit 7 determines that the temperature of the amplification unit 5 has risen to the first set temperature and the detected temperature has become equal to or higher than the first set temperature (S1: YES, refer to “t1” in FIG. 4)
  • the ON signal To the signal processing unit 3 and the setting of the passing frequency band of the audio signal in the signal processing unit 3 is changed from the first frequency band to the second frequency band (S2).
  • the control unit 7 changes the setting of the frequency of the reference clock output to the PWM conversion unit 4 from the first frequency to the second frequency (S3).
  • control unit 7 changes the setting of the reference clock frequency from the first frequency to the second frequency when the detected temperature has shifted from less than the first set temperature to above the first set temperature.
  • the switching loss in the amplifying unit 5 is reduced, and the temperature rise of the amplifying unit 5 thereafter is suppressed.
  • the frequency of the reference clock is changed from the first frequency to the second frequency in this way, there is a possibility that the high frequency band cannot be PWM-converted and a distortion component may be generated.
  • the signal passing frequency band is changed from the first frequency band to the second frequency band (passing on the high band side is prohibited) to avoid the possibility of distortion components.
  • the warning sound to the driver is generally around 1 [kHz] where human sensitivity is high, and is sufficiently lower than 20 [kHz] which is the upper limit of the human audible band. Even if passage on the high band side is prohibited, sound quality degradation does not occur. In other words, even when the detected temperature is equal to or higher than the first set temperature, the warning sound can be appropriately output by not restricting the passage of the frequency band such as the warning sound to the driver. Can be appropriately provided to the driver.
  • the control unit 7 determines whether or not the detected temperature is lower than the second set temperature (S4).
  • the second set temperature is a temperature for giving a hysteresis characteristic, and is a temperature lower than the first set temperature.
  • the second set temperature is also written in the computer program at the stage where the vehicle audio output control device 1 is manufactured, for example.
  • the control unit 7 changes the setting of the reference clock frequency from the first frequency to the second frequency to suppress the temperature increase of the amplification unit 5, so that the temperature of the amplification unit 5 is set to the second setting. If it is determined that the detected temperature is lower than the second set temperature (S4: YES, refer to “t2” in FIG. 4), the reference clock frequency is changed from the second frequency to the first frequency. (S5). Next, the control unit 7 outputs an off signal to the signal processing unit 3, changes the setting of the pass frequency band of the audio signal in the signal processing unit 3 from the second frequency band to the first frequency band (S6), and temperature The detection routine is terminated and the next temperature detection routine is awaited.
  • control unit 7 changes the setting of the frequency of the reference clock from the second frequency to the first frequency when the detected temperature shifts from the second set temperature or more to less than the second set temperature.
  • the detected temperature becomes equal to or higher than the first set temperature. Return to the state.
  • the control unit 7 repeatedly performs the above-described process during a period in which the vehicle audio output control device 1 is in the activated state.
  • the vehicle audio output control device 1 is a period from when it is activated or until the detected temperature first becomes equal to or higher than the first set temperature after being lower than the second set temperature. Then, as shown in FIG. 5, the operation is performed with the frequency of the reference clock as the first frequency and the pass frequency band of the audio signal as the first frequency band (normal operation). On the other hand, during the period from when the detected temperature becomes equal to or higher than the first set temperature to when the detected temperature first falls below the second set temperature, the vehicular audio output control device 1 performs the frequency of the reference clock as shown in FIG. Is set as the second frequency and the pass frequency band of the audio signal is set as the second frequency band (high temperature operation).
  • the detected temperature of the amplifying unit 5 that amplifies the PWM signal is less than the first set temperature to the first set temperature or higher.
  • the pass frequency band of the audio signal in the signal processing unit 3 is changed from the first frequency band to the second frequency band, and the reference clock frequency is changed from the first frequency to the second frequency. I made it.
  • the switching loss in the amplifying unit 5 can be reduced, and the subsequent temperature rise of the amplifying unit 5 can be suppressed.
  • the frequency of the reference clock is lowered, the high band side cannot be PWM-converted and a distortion component may be generated.
  • the setting of the passing frequency band of the audio signal in the signal processing unit 3 is first changed from the first frequency band to the second frequency band, and then the frequency of the reference clock is changed from the first frequency to the second frequency.
  • the setting was changed.
  • the frequency of the reference clock is lowered before the high-band side is prohibited, a distorted audio signal may be output, but after the high-band side is prohibited, the reference clock is output.
  • the possibility can be eliminated and the reliability of the product can be ensured.
  • the frequency of the reference clock is changed from the second frequency to the first frequency
  • the signal processing unit 3 The passing frequency band of the audio signal is changed from the second frequency band to the first frequency band.
  • the frequency of the reference clock is first changed from the second frequency to the first frequency, and then the audio signal passing frequency band in the signal processing unit 3 is changed from the second frequency band to the first frequency band.
  • the setting was changed.
  • the high frequency band is allowed to pass before the reference clock frequency is increased (returned), a distorted audio signal may be output in this case as well.
  • the possibility can be eliminated and the reliability of the product can be ensured.
  • the temperature lower than the first set temperature is set as the second set temperature, the hysteresis characteristic can be provided, and the frequency of the reference clock and the passing frequency band of the audio signal are frequently switched by a subtle temperature change. Can be avoided in advance.
  • the control unit 7 outputs a coefficient setting signal to the signal processing unit 3.
  • the signal processing unit 3 receives the coefficient setting signal from the control unit 7, the signal processing unit 3 switches the cut-off frequency to three or more levels based on the coefficient included in the input coefficient setting signal, and sets the pass frequency band of the audio signal to three or more levels. Selectively in frequency band.
  • the control unit 7 switches and controls the frequency of the reference clock output to the PWM conversion unit 4 in three or more steps according to the detected temperature input from the temperature detection unit 8. Also in the second embodiment, it is possible to achieve both the protection of parts under a high temperature environment and the ensuring of driving safety and safety.
  • the switching loss in the amplifying unit 5 is gradually reduced in three or more steps according to the detected temperature, thereby increasing the temperature of the amplifying unit 5 by three or more steps. Can be suppressed in stages.
  • control unit combines the means for outputting the reference clock and the means for setting the pass frequency band of the audio signal and setting the frequency of the reference clock.
  • these means are configured by separate functional blocks. May be.
  • the first set temperature and the second set temperature may be configured to be the same, that is, to have a hysteresis characteristic. It is not necessary.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Amplifiers (AREA)

Abstract

L'invention concerne un dispositif de commande de sortie vocale véhiculaire qui comporte : un moyen de traitement de signal (3) qui limite une bande passante de fréquence d'un signal vocal ; un moyen de sortie d'horloge de référence (7) qui produit une horloge de référence ; un moyen de modulation d'impulsions en durée (4) qui module la largeur d'impulsion du signal vocal produit par le moyen de traitement de signal en recherchant la fréquence de l'horloge de référence produite par le moyen de sortie d'horloge de référence, afin de générer un signal à modulation d'impulsions en durée, et qui produit le signal à modulation d'impulsions en durée généré ; un moyen d'amplification (5) qui amplifie le signal à modulation d'impulsions en durée du moyen de modulation d'impulsions en durée au moyen d'un élément commutateur (12, 13) ; un moyen de détection de température (8) qui détecte une température de détection réfléchissant la température d'au moins le moyen d'amplification ; et un moyen de commande (7) qui définit la bande passante de fréquence du signal vocal dans le moyen de traitement de signal et la fréquence de l'horloge de référence produite par le moyen de sortie d'horloge de référence en fonction de la température de détection détectée par le moyen de détection de température.
PCT/JP2014/003218 2013-06-26 2014-06-17 Dispositif de commande de sortie vocale véhiculaire WO2014208042A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2013133740A JP2015012309A (ja) 2013-06-26 2013-06-26 車両用音声出力制御装置
JP2013-133740 2013-06-26

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WO2014208042A1 true WO2014208042A1 (fr) 2014-12-31

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PCT/JP2014/003218 WO2014208042A1 (fr) 2013-06-26 2014-06-17 Dispositif de commande de sortie vocale véhiculaire

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62145927A (ja) * 1985-12-20 1987-06-30 Hitachi Ltd デ−タ変換装置
JPH11274863A (ja) * 1998-03-24 1999-10-08 Sony Corp スイッチング増幅器
JP2007251928A (ja) * 2006-02-17 2007-09-27 Canon Inc デジタルアンプ及びテレビジョン受信装置
JP2008160776A (ja) * 2006-12-26 2008-07-10 Funai Electric Co Ltd Ｄ級増幅器

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62145927A (ja) * 1985-12-20 1987-06-30 Hitachi Ltd デ−タ変換装置
JPH11274863A (ja) * 1998-03-24 1999-10-08 Sony Corp スイッチング増幅器
JP2007251928A (ja) * 2006-02-17 2007-09-27 Canon Inc デジタルアンプ及びテレビジョン受信装置
JP2008160776A (ja) * 2006-12-26 2008-07-10 Funai Electric Co Ltd Ｄ級増幅器

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