WO2004040744A1 - Systeme audio avec smps inactive pendant la syntonisation - Google Patents

Systeme audio avec smps inactive pendant la syntonisation Download PDF

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Publication number
WO2004040744A1
WO2004040744A1 PCT/IB2003/004231 IB0304231W WO2004040744A1 WO 2004040744 A1 WO2004040744 A1 WO 2004040744A1 IB 0304231 W IB0304231 W IB 0304231W WO 2004040744 A1 WO2004040744 A1 WO 2004040744A1
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WO
WIPO (PCT)
Prior art keywords
audio signal
signal generating
audio
smps
stage
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/IB2003/004231
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English (en)
Inventor
Henricus P. M. Derckx
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Koninklijke Philips Electronics NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Koninklijke Philips Electronics NV filed Critical Koninklijke Philips Electronics NV
Priority to AU2003260930A priority Critical patent/AU2003260930A1/en
Publication of WO2004040744A1 publication Critical patent/WO2004040744A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from AC input or output
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • H02M3/22—Conversion of DC power input into DC power output with intermediate conversion into AC
    • H02M3/24—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters
    • H02M3/28—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
    • H02M3/325—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal
    • H02M3/335—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
    • H02M3/33507—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters
    • H02M3/33523—Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of the output voltage or current, e.g. flyback converters with galvanic isolation between input and output of both the power stage and the feedback loop

Definitions

  • the present invention relates to an audio system comprising a switch mode power supply or SMPS, an output stage and an audio signal generating device.
  • Examples of present audio products or audio systems are portable and stationary compact cassette recorders (CCC), digital compact cassette recorders (DCC) and tape stations, mini disc recorders (MD), compact disc apparatuses (CD), digital versatile disc apparatuses (DND), radio receivers including VHF, TJHF, FM, LW, MW and SW receivers based on frequency modulated, phase modulated or amplitude modulated reception technique and digital receivers and automobile appliances including automobile radios.
  • CCC compact cassette recorders
  • DCC digital compact cassette recorders
  • MD mini disc recorders
  • CD compact disc apparatuses
  • DND digital versatile disc apparatuses
  • radio receivers including VHF, TJHF, FM, LW, MW and SW receivers based on frequency modulated, phase modulated or amplitude modulated reception technique and digital receivers and automobile appliances including automobile radios.
  • Portable or stationary apparatuses of the above kind together with numerous other kinds of apparatuses including home video tranceivers, TN sets, TN monitors, PC etc. may be powered by a mains power supply or from a battery package including a conventional 12 N battery of an automobile.
  • the present invention provides a novel technique of preventing interference in the audio signal generating stage or audio signal generating device originating from the SMPS.
  • the concern of reducing power consumption of the audio system has promoted the development of high efficiency SMPS including oscillators oscillating at fairly high frequencies allowing the decoupling capacitors of the SMPS to be fairly small thereby reducing the size and weight of the SMPS and further the entire audio system.
  • the use of a fairly high switching frequency of the SMPS may, however, give rise to interference and modulation problems in the audio signal generating device, in particular in frequency control converter stages or frequency control tuner stages of the audio signal generating device or audio signal generating stage.
  • interference problems originating from high frequency oscillators have been solved by shielding and decoupling which to a great extent may eliminate the interference problems.
  • the present invention is based on a totally different approach of solving the interference problems originating from the oscillator of the SMPS and causing interference in the frequency control converter stage or frequency control tuner stage of the audio signal generating device or audio signal generating stage of the audio system allowing on the one hand a high efficiency SMPS to be utilised in conjunction with a high efficiency output stage and avoiding or eliminating interference in the frequency control audio stage of the audio signal generating device.
  • a particular advantage of the present invention relates to the provision of an audio system including a SMPS, an output stage and an audio signal generating stage or audio signal generating device, which audio system may be provided as a high compact and high efficiency system allowing stationary and also portable products to be based on the novel audio system technique according to the present invention.
  • an audio system comprising a switch mode power supply or SMPS, an output stage, connected to the SMPS for receiving power therefrom and having an audio input and an audio output, and an audio signal generating device or audio signal generating stage including a frequency controlled converter stage or a frequency controlled tuner stage for the generation of an audio signal output from the audio signal generating device to the input of the output stage, the audio signal generating device being connected to the SMPS for receiving power therefrom, the SMPS being operated in alternating active and non-active intervals for pulsing and not pulsing, respectively, the SMPS and the audio signal generating device being operated in the non-active intervals exclusively while the SMPS is not pulsed for avoiding interference between the SMPS and the audio signal generating device.
  • SMPS switch mode power supply or SMPS
  • an output stage connected to the SMPS for receiving power therefrom and having an audio input and an audio output
  • an audio signal generating device or audio signal generating stage including a frequency controlled converter stage or a frequency controlled tuner
  • the SMPS is operated in an alternating mode, namely a pulsed and a non-pulsed mode allowing the audio signal generating device to be operated in the non-pulsed period of the alternating operational mode of the SMPS without any interference being generated from the oscillator of the SMPS as the SMPS is not pulsed.
  • stage and device are to be considered genetic terms describing a separate part or apparatus or a part of an apparatus or a system conventionally considered a part of the overall apparatus or system performing a specific operation such as receiving an demodulating a wireless signal, converting a digital signal into an analogue system etc.
  • the terms are to be construed as generic terms without in any sense limiting the relevant part of an apparatus or a system to a specific device or a specific stage.
  • the terms are rather to be considered comprising any set of components conventionally considered by a person skilled in the art as a stage or a device in the true meaning of the terms.
  • the audio system according to the present invention may be implemented in numerous embodiments and be based on a number of different signal processing and conversion techniques.
  • the individual stages of the audio system according to the present invention maybe dedicated for different applications as, among others, the output stage of the audio system may be implemented as a low level output stage or alternatively, a high level output stage meaning in this context, an output stage delivering a level of less than 1 W, such as 100 mW as a low level output stage or alternatively delivering an excess of 1 W, such as 10 W, 100 W or even more as a high level output stage.
  • the output stage may be based on well known techniques per se, such as the class A, the class B, the class AB, the class C, class T or alternatively and preferably the class D technique allowing an extremely high efficient and low weight audio system to be deduced.
  • the class D output technology By the use of the class D output technology, the overall efficiency of the audio system may be increased, thereby reducing the heat emission requirements to be complied with and further reducing the overall size, weight and cost of the audio system.
  • the audio signal generating device or audio signal generating stage of the audio system may constitute a converter or tuner stage or part, such as a D/A converter of a compact disc, a DVD, a DCC or mini disc reproducing apparatus or alternatively an A/D converter of a mini disc (MD) recorder or digital compact cassette (DCC) recorder.
  • level shaping stages such as AGC (Automatic gaining control stages), compressors or limitors may further be based on the technique characteristic of the present invention as defined above.
  • a particular application of the present invention relates to tuner stages and the audio signal generating device, consequently, according to the presently preferred embodiments of the audio system according to the present invention constitutes a syntheziser tuner being an analogue NHF, UHF, FM, PM or AM tuner or a digital tuner, such as a mobile telephone receiver stage, e.g. a GSM or satellite receiver.
  • a syntheziser tuner being an analogue NHF, UHF, FM, PM or AM tuner or a digital tuner, such as a mobile telephone receiver stage, e.g. a GSM or satellite receiver.
  • the SMPS may for complying with the high efficiency requirements preferably be operated at a fairly high frequency, such as a frequency of the order of 5 kHz-5 MHz, such as 5-50 kHz, 50-500 kHz, 500-5 MHz, 5 MHz-50 MHz, e.g. 5- 10 kHz, 10-20 kHz, 20-50 kHz, 50-100 kHz, 100-200 kHz, 200-500 kHz, 500-1 MHz, 1-2 MHz, 2-5 MHz, 5-10, MHz, 10-50 MHz.
  • a fairly high frequency such as a frequency of the order of 5 kHz-5 MHz, such as 5-50 kHz, 50-500 kHz, 500-5 MHz, 5 MHz-50 MHz, e.g. 5- 10 kHz, 10-20 kHz, 20-50 kHz, 50-100 kHz, 100-200 kHz, 200-500 kHz, 500-1 MHz, 1-2 MHz, 2-5 MHz, 5-10, MHz,
  • the active interval may be longer than, identical to or shorter than the inactive interval in the alternating operation of the SMPS. It is to be understood that the active interval in which the SMPS is operated or generating power to be delivered to the output stage and also to the audio signal generating device need to be long enough for allowing the voltage or the voltages output from the SMPS to be maintained by the charge capacitors of the SMPS at a level above a specific minimum level during the operation of the audio system.
  • the active and non-active intervals together define a symmetric or asymmetric cycle defining a frequency smaller than the switch frequency or pulse frequency of the SMPS such as a frequency of at least one order lower than the frequency of a SMPS when operated in the active interval.
  • the switching of the SMPS between the pulsing mode and the non- pulsing mode may be controlled by a switching element or a clock of the switch mode supply, it is, however, preferred that the switch be performed by means of a voltage detector stage detecting the voltage supplied from the SMPS to the audio signal generating device and controlling the SMPS in the alternating active and non-active intervals by switching the SMPS into pulsing mode provided a specific mimmum SMPS voltage level be detected at the audio signal generating device and by controlling the SMPS into non pulsing mode provided a specific maximum SMPS voltage level be detected at the audio generating device.
  • the audio signal generating device is an AM tuner comprises the automatic search mode of the AM tuner or similar sweep or tuning operation.
  • Fig. 1 is a schematic view illustrating the general architectural set-up of the audio system according to the present invention.
  • Fig. 2 is a diagramatic view illustrating in a time diagram the operation of a SMPS and a tuner of the audio system according to the present invention
  • Fig. 3 is a schematic and diagramatic view of a prototype implementation of the SMPS of the audio system according to the present invention.
  • Fig. 1 a diagram is shown illustrating the architectural set-up of an audio system according to the present invention.
  • the audio system is being described with reference to an AM tuner exclusively, however, it is contemplated that the teachings of the present invention are also applicable in connection with different audio systems including FM or PM tuners, such as UHF, NHF or digital tuners or further alternatively frequency controlled clock operated apparatuses such as CD desks, MD, DCC or similar apparatuses including a clock controlled AID or D/A converter.
  • FM or PM tuners such as UHF, NHF or digital tuners
  • frequency controlled clock operated apparatuses such as CD desks, MD, DCC or similar apparatuses including a clock controlled AID or D/A converter.
  • the audio system is designated the reference numeral 10 and includes an SMPS 12 powering a tuner 14 and an output amp. 16 which is connected to a speaker 18.
  • the SMPS function for an audio system including an amplifier and a tuner is realised by a transformer including bridge rectifier and buffer or an SMPS.
  • the transformer/bridge rectifier solution is an AM tuner compatible solution, however causes uncontrolled, i.e. impedance and load dependent output voltages and is bulky and increases the weight of the system.
  • the conventional SMPS's are, however, not compatible with AM tuner or similar clock or frequency controlled apparatus.
  • the SMPS switching may cause frequency disturbances or interference in the AM frequency spectrum. This interference may result in audio disturbance or noise in normal operation mode or alternatively false stop during the tuner search mode.
  • the amplifier may be of different type or class such as a conventional AB or preferably a D class amplifier.
  • the class D amplifier is preferred due to its high efficiency, simplicity, power capability, low distortion, miniaturisation and cost.
  • the D class amplifier is switched off (load switched off) resulting in zero amplifiers or tuner disturbances. Therefore, in conventional architecture set-ups, the AM tuner compatibility optimisation is focusing on the class D operation under normal operation only.
  • the SMPS is controlled into a active and non-active mode in order to eliminate the interference or disturbance problems caused by the clock frequency of the SMPS.
  • the SMPS In the active state, the SMPS is pulsed, whereas in the non-active state the SMPS is caused not to pulse allowing the AM tuner to be operated without any interference from the clock frequency of the SMPS.
  • the AM tuner In the non-active state or in the non- active interval of the SMPS, the AM tuner is allowed to perform its search in search mode without interference or disturbance from the SMPS.
  • the SMPS is, consequently, deduced as an AM tuner compatible solution allowing the SMPS and class D amplifier to be used in combination with 300 or 350 kHz fixed frequency operation and 2.5 MHz (above AM frequency spectrum) operation.
  • the AM tuner compatible SMPS allows for the construction of a low power consumption and high power efficiency class B output stage to be combined with the AM tuner.
  • Fig. 2 a diagram is shown illustrating the operation of the SMPS and also the tuner of the audio system shown in Fig. 1.
  • Fig. 2 two complete cycles of the active/non-active alternation of the SMPS is shown.
  • the cycle of the alternating SM includes an ON and OFF state.
  • the ON state the SMPS is operated as is illustrated in the top diagram of Fig. 2 as the SMPS is pulsed.
  • the OFF state the SMPS is not pulsed.
  • the supply ripple of the SMPS controller is illustrated as the ripple is caused to increase during the ON state and slowly decreases during the OFF state, as the SMPS is OFF.
  • the tuner supply ripple illustrated in the third diagram of Fig. 3 varies in conformity with the variation of the SMPS supply ripple.
  • the tuner supply ripple constitutes a reflected wave form of the controller supply ripple which is controlled as indicated in Fig. 2 between its maximum level OVP and mimmum level UVLO.
  • the operation of the tuner search is illustrated in the lowest or fourth diagram in Fig. 4 as the search mode is switched off during the SMPS ON interval and the search mode is switched on during the SMPS OFF interval. In doing so, any interference from an SMPS switching in the AM tuner search mode is eliminated.
  • the switching of the SMPS between ON and OFF may be controlled by an external clock or alternatively be based on a detection of the SMPS ripple in order to prevent that the load of the output stage of the audio system shown in Fig.
  • the controlling of the SMPS between its ON and OFF states is performed for maintaining the tuner supply voltage within a specific voltage range defined by a minimum voltage mdicated in the diagram and a maximum level also indicated in the diagram.
  • the controlling of the SMPS and at the same time the controlling of the tuner for allowing the tuner to be turned into its search mode may be performed by a commercially available circuit, namely a controller of the type Philips TEA1507. Reference is made to the Application Note AN00047 supplied by Philips Semi Conductors and describing a "75W SMPS TEA1507 Quasi-Resonant Flyback controller"
  • a diagram of a prototype implementation of the SMPS of the audio system according to the present invention is shown including a SMPS controller of the type Philips TEA 1507.
  • the microprocessor of the audio system controls the operation of the TEA 1507 SMPS controller by means of a current pulse generator 100 which is connected to the base of an NPN transistor 102 which switches ON and OFF a light emitting diode or LED 104.
  • the LED 104 is connected in an opto coupler setup to a photo sensitive transistor 106, the collector emitter path of which is connected in a current path from a positive supply terminal 1 of the TEA 1507 SMPS controller designated the reference numeral 108 to a control input 3 of SMPS controller 108 as the LED 104 and the transistor 106 provide an output voltage control/feedback function for the SMPS controller 108 and the entire SMPS.
  • the circuit constituted by the current pulse generator 100 and the NPN transmitter 102 provides a burst mode standby function which is sensed or detected by the SMPS controller 108 through the LED 104 and the transmitter 106.
  • the SMPS controller further includes a driver output 6 which switches ON and OFF an FET transistor 110 for turning ON and OFF the SMPS part of the ON and OFF circuitry, which part includes a transformer 112 having a single primary winding and two secondary windings which are connected to respective charging capacitors 114 and 116 through rectifier diodes 118 and 120, respectively.
  • the voltage across the stabilising capacitor 114 is further stabilised by means of a linear stabiliser circuit 122.

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

Abstract

L'invention concerne un système audio (10) comprenant une alimentation à découpage (12) ou SMPS et un étage de sortie (16) alimenté par cette dernière. Ce système audio (10) comprend une entrée audio et une sortie audio. Le dispositif produisant un signal audio (14) ou l'étage produisant un signal audio comporte un étage de conversion commandé en fréquence ou à oscillation libre ou un étage de syntonisation commandé en fréquence destiné à produire un signal audio qui est fourni par le dispositif produisant le signal audio (14) à l'entrée de l'étage de sortie, le dispositif produisant le signal audio (14) étant relié à la SMPS (12) et alimenté par cette dernière. La SMPS (12) est utilisée à des intervalles actifs et non actifs alternés pour pulser ou non le signal, respectivement, et le dispositif produisant le signal audio (14) est utilisé aux intervalles non actifs exclusivement lorsque la SMPS (12) n'est pas pulsée, pour éviter les interférences entre la SMPS (12) et le dispositif produisant le signal audio (14).
PCT/IB2003/004231 2002-10-30 2003-09-22 Systeme audio avec smps inactive pendant la syntonisation Ceased WO2004040744A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003260930A AU2003260930A1 (en) 2002-10-30 2003-09-22 Audio system with inactive smps during tuner search

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP02079543.1 2002-10-30
EP02079543 2002-10-30

Publications (1)

Publication Number Publication Date
WO2004040744A1 true WO2004040744A1 (fr) 2004-05-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2003/004231 Ceased WO2004040744A1 (fr) 2002-10-30 2003-09-22 Systeme audio avec smps inactive pendant la syntonisation

Country Status (2)

Country Link
AU (1) AU2003260930A1 (fr)
WO (1) WO2004040744A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2438257A (en) * 2006-05-20 2007-11-21 Ford Global Tech Llc Receiving apparatus having a low quiescent current
CN111753385A (zh) * 2020-07-03 2020-10-09 石家庄科林电气股份有限公司 基于仿水流路径算法的寻找电源方法

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0654911A2 (fr) * 1993-11-22 1995-05-24 Nokia Mobile Phones Ltd. Alimentation à découpage pour systèmes de radiotéléphone par accès multiple et à division dans le temps
GB2308950A (en) * 1996-01-08 1997-07-09 Matsushita Communication Ind U Power supply for intermittent load
GB2328844A (en) * 1997-09-02 1999-03-03 Nec Technologies Portable appliance power supply
WO2001037414A1 (fr) * 1999-11-12 2001-05-25 Koninklijke Philips Electronics N.V. Systeme et procede d'alternance de mode veille
US20010043060A1 (en) * 2000-05-19 2001-11-22 Per-Olof Brandt DC/DC converters

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0654911A2 (fr) * 1993-11-22 1995-05-24 Nokia Mobile Phones Ltd. Alimentation à découpage pour systèmes de radiotéléphone par accès multiple et à division dans le temps
GB2308950A (en) * 1996-01-08 1997-07-09 Matsushita Communication Ind U Power supply for intermittent load
GB2328844A (en) * 1997-09-02 1999-03-03 Nec Technologies Portable appliance power supply
WO2001037414A1 (fr) * 1999-11-12 2001-05-25 Koninklijke Philips Electronics N.V. Systeme et procede d'alternance de mode veille
US20010043060A1 (en) * 2000-05-19 2001-11-22 Per-Olof Brandt DC/DC converters

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2438257A (en) * 2006-05-20 2007-11-21 Ford Global Tech Llc Receiving apparatus having a low quiescent current
GB2438257B (en) * 2006-05-20 2011-01-26 Ford Global Tech Llc Receiving apparatus having a low quiescent current
CN111753385A (zh) * 2020-07-03 2020-10-09 石家庄科林电气股份有限公司 基于仿水流路径算法的寻找电源方法
CN111753385B (zh) * 2020-07-03 2023-07-25 石家庄科林电气股份有限公司 基于仿水流路径算法的寻找电源方法

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