WO2019085256A1 - Circuit d'amplification de puissance, amplificateur de puissance et télévision laser - Google Patents

Circuit d'amplification de puissance, amplificateur de puissance et télévision laser Download PDF

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Publication number
WO2019085256A1
WO2019085256A1 PCT/CN2018/071429 CN2018071429W WO2019085256A1 WO 2019085256 A1 WO2019085256 A1 WO 2019085256A1 CN 2018071429 W CN2018071429 W CN 2018071429W WO 2019085256 A1 WO2019085256 A1 WO 2019085256A1
Authority
WO
WIPO (PCT)
Prior art keywords
circuit
resistor
power amplifier
electrically connected
power
Prior art date
Application number
PCT/CN2018/071429
Other languages
English (en)
Chinese (zh)
Inventor
熊再祥
李屹
Original Assignee
深圳光峰科技股份有限公司
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 深圳光峰科技股份有限公司 filed Critical 深圳光峰科技股份有限公司
Publication of WO2019085256A1 publication Critical patent/WO2019085256A1/fr

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Classifications

    • 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
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/181—Low-frequency amplifiers, e.g. audio preamplifiers
    • H03F3/183—Low-frequency amplifiers, e.g. audio preamplifiers with semiconductor devices only
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/63—Generation or supply of power specially adapted for television receivers

Definitions

  • the invention relates to the field of circuit design, in particular to a power amplifier circuit, a power amplifier and a laser television.
  • the power amplifier control of laser TV is mainly composed of two parts: power supply and power amplifier drive.
  • the power supply part mostly uses half-bridge resonant converter (LLC) to control DC-DC conversion.
  • the power amplifier drive part mainly uses digital audio power amplifier to control the sound. Expand. Under normal circumstances, when playing low frequency (50Hz ⁇ 200Hz) music and video, the amplifier driver needs a large current. When the output current of the power supply circuit increases, the voltage of the overcurrent protection terminal of the half-bridge resonant converter is greater than the threshold voltage. At this time, the Fairchild Semiconductor series power switch in the half-bridge resonant converter is triggered to enter the automatic restart protection mode, A corresponding voltage is delivered to the power amplifier drive circuit.
  • the power amplifier circuit 1 is a schematic structural view of an embodiment of a power amplifier circuit in the prior art.
  • the power amplifier circuit 1 includes two parts of a power supply circuit 100 and a power amplifier drive circuit 200 connected in series, and the power supply circuit 100 and the power amplifier drive circuit 200 are electrically connected.
  • the power supply circuit 100 includes an LLC resonant circuit 101 and an overcurrent protection circuit 102, and the overcurrent protection circuit 102 is connected in parallel with the LLC resonant circuit 101.
  • the LLC resonant circuit 101 includes a semiconductor power switch in series and a first transformer, and the overcurrent protection circuit includes at least two fixed value resistors (not shown).
  • the power amplifier driving circuit 200 requires a large current.
  • a technical solution adopted by the present invention is to provide a power amplifier circuit including: a power supply circuit and a power amplifier driving circuit, the power supply circuit and the power amplifier driving circuit are electrically connected, and the power supply circuit includes an LLC resonant circuit and An overcurrent protection circuit, the overcurrent protection circuit is connected in parallel with the LLC resonant circuit, the overcurrent protection circuit includes a first resistor and a second resistor, a first end of the first resistor and the LLC resonant circuit The output end is electrically connected, the second end of the first resistor is electrically connected to the overcurrent protection end of the LLC resonant circuit, and the first end of the second resistor is electrically connected to the output end of the LLC resonant circuit. The second end of the second resistor is grounded, and the second resistor is a variable resistor.
  • another technical solution adopted by the present invention is to provide a power amplifier including a speaker and any one of the above power amplifier circuits, and the power amplifier circuit is electrically connected to the speaker.
  • another technical solution adopted by the present invention is to provide a laser television including any of the above power amplifier circuits.
  • the invention has the beneficial effects that the power amplifier circuit includes an overcurrent protection circuit and a current limiting circuit, and the variable second resistor is used to split the LLC resonant circuit by adjusting the second resistor.
  • the resistance value makes the overvoltage protection terminal voltage of the LLC resonant circuit within the threshold voltage range, avoiding problems such as downtime caused by excessive output current of the power supply circuit or burnout of the rear circuit board when playing low frequency music and video.
  • the invention can improve the playing effect of music and video and enhance the user experience.
  • FIG. 1 is a schematic structural view of an embodiment of a power amplifier circuit in the prior art
  • FIG. 2 is a schematic structural diagram of an embodiment of a power supply circuit in a power amplifier circuit provided by the present invention
  • FIG. 3 is a schematic structural view of an embodiment of a power amplifier circuit provided by the present invention.
  • FIG. 4 is a schematic structural view of an embodiment of a current limiting circuit in a power amplifier circuit provided by the present invention.
  • FIG. 2 is a schematic structural diagram of an embodiment of a power supply circuit in a power amplifier circuit according to the present invention
  • FIG. 3 is a schematic structural diagram of an embodiment of a power amplifier circuit provided by the present invention.
  • the power amplifier circuit 3 provided by the present invention includes two parts of the power supply circuit 300 and the power amplifier drive circuit 400 connected in series, and the power supply circuit 300 and the power amplifier drive circuit 400 are electrically connected.
  • the power supply circuit 300 includes an LLC resonant circuit 301 and an overcurrent protection circuit 302, and the overcurrent protection circuit 302 is connected in parallel with the LLC resonant circuit 301.
  • the overcurrent protection circuit 302 includes a first resistor 3021 and a second resistor 3022.
  • the connection relationship is as follows.
  • the first end of the first resistor 3021 is electrically connected to the output end of the LLC resonant circuit 301, and the second end of the first resistor 3021 is electrically connected to the overcurrent protection end of the LLC resonant circuit 301, and the second resistor 3022 is The first end is electrically connected to the output of the LLC resonant circuit 301, and the second end of the second resistor 3022 is grounded.
  • the second resistor 3022 is a variable resistor.
  • the power amplifier driving circuit when playing low frequency (50 Hz ⁇ 200 Hz) music and video, the power amplifier driving circuit needs a large current, but the current flowing through the first resistor 3021 is excessive, resulting in overcurrent protection of the LLC resonant circuit 301.
  • the voltage at the terminal is greater than the preset threshold and enters the automatic restart protection mode.
  • the excessive current is shunted out through the second resistor 3022, thereby reducing the voltage of the overcurrent protection terminal to a reasonable range without causing an overcurrent protection terminal voltage. Enters the automatic protection mode beyond its preset voltage threshold.
  • the LLC resonant circuit 301 includes a semiconductor power switch 3011 and a first transformer 3012 connected in series.
  • the first end of the semiconductor power switch 3011 is connected to the power supply voltage, and the overcurrent protection end of the semiconductor power switch 3011 is electrically connected to the second end of the first resistor 3021.
  • the first end of the first transformer 3012 is electrically connected to the second end of the first power transformer 3011, and the third end of the first transformer 3012 is electrically connected to the first end of the first resistor 3021.
  • a fourth end of a transformer 3012 is electrically coupled to the power amplifier drive circuit 400.
  • the power amplifier driving circuit 400 when playing low frequency (50 Hz to 200 Hz) music and video, the power amplifier driving circuit 400 needs a large current, which may cause the voltage of the overcurrent protection terminal of the semiconductor power switch 3011 to be greater than a preset voltage threshold. Enter the automatic protection mode.
  • the second resistor 3022 by adjusting the second resistor 3022 and reducing its resistance, an excessive current is shunted out through the second resistor 3022, thereby reducing the voltage of the overcurrent protection terminal to a reasonable range without causing The flow protection terminal voltage exceeds its preset voltage threshold and enters the automatic protection mode.
  • the LLC resonant circuit further includes a second transformer (not shown), the input end of the second transformer is electrically connected to the fourth end of the first transformer 3012, and the output of the second transformer and the power amplifier
  • the drive circuit 400 is electrically connected.
  • the DC voltage at the first end of the first transformer 3012 is 220V.
  • the preset voltage threshold of the overcurrent protection terminal of the semiconductor power switch 3011 is a range. Among them, the preset voltage threshold is obtained by a plurality of experimental statistics and analysis to obtain a reasonable preset voltage threshold range, and is set by the power amplifier circuit. The following is an example of 5 volts.
  • the power supply circuit 300 When the voltage of the overcurrent protection terminal of the semiconductor power switch 3011 does not exceed 5 volts, the power supply circuit 300 operates normally. When playing low frequency (50 Hz to 200 Hz) music and video, the power amplifier driving circuit 400 requires a large current, which causes the current through the first transformer 3012 to become large, ranging from about 41.667 amps to 65 amps.
  • the first resistor 3021 has a resistance of 500 ohms.
  • the semiconductor power switch 3011 is triggered to enter the automatic restart protection mode.
  • the resistance value of the second resistor 3022 needs to be adjusted accordingly to cause a shunting effect.
  • the current value flowing through the second resistor 3022 needs to be in the range of 41.657 amps to 64.99 amps, and the corresponding resistance range of the second resistor 3022 needs to be adjusted to 5/41.657 ohms to 5/64.99 ohms, that is, 0.077 ohms to 0.12 ohms. ohm.
  • the resistance range of the second resistance is not limited to the above range, and the DC voltage value according to the first end of the first transformer 3012 and the preset voltage threshold of the overcurrent protection terminal of the semiconductor power switch 3011 are required. Adjust and match accordingly, not limited here.
  • the power amplifier driving circuit 400 includes a current limiting circuit 402 and a power amplifying circuit 401 connected in series, and the power amplifying circuit 401 is electrically connected to the power supply circuit 300 through the current limiting circuit 402.
  • FIG. 4 is a schematic structural diagram of a current limiting circuit in a power amplifier driving circuit provided by the present invention.
  • the current limiting circuit 402 is composed of a triode 4024, a third resistor 4021, a fourth resistor 4022, and a fifth resistor 4023.
  • the second end of the third resistor 4021 is electrically connected to the first end of the fourth resistor 4022, and the connection point thereof is electrically connected to the base of the transistor 4024.
  • the emitter of the transistor 4024 is electrically coupled to the first end of the fifth resistor 4023.
  • the collector of the tertiary tube 4024 is electrically connected to the first end of the third resistor 4021, and its connection point is electrically connected to the power supply circuit.
  • the second end of the fourth resistor 4022 is electrically connected to the second end of the fifth resistor 4023, and the connection point thereof is electrically connected to the power amplifying circuit.
  • the triode 4024 is an NPN type triode. In other embodiments, the type of the triode may also be other commonly used models, which is not limited herein.
  • the semiconductor power switch 3011 when the voltage output current of the power circuit 300 is a normal rated value, the semiconductor power switch 3011 is turned on.
  • the bias current of the transistor 4024 is provided by the third resistor 4021, and the transistor 4024 is saturated. The current does not control the current, and the power amplifier driving circuit 400 works normally.
  • the current limiting circuit 402 protects the power amplifying circuit 401 from being burned when the current increases.
  • the output current of the power supply circuit 300 is greater than the normal rated value, the voltage drop across the fifth resistor 4023 increases, and the sum of the voltage drop across the fifth resistor 4023 and the junction of the transistor 4024 is close to the voltage drop of the fourth resistor 4022. Then, the current passing through the transistor 4024 is started to be limited, thereby achieving the purpose of protecting the power amplifying circuit 401.
  • the present invention provides an overcurrent protection circuit and a current limiting circuit in a power amplifier circuit, which utilizes a variable second resistor to shunt the LLC resonant circuit, and adjusts the resistance of the second resistor to cause the LLC resonant circuit to pass
  • the voltage of the current protection terminal is within the threshold voltage range to avoid problems such as downtime caused by excessive output current of the power supply circuit or burnout of the circuit board after the low frequency music and video are played.
  • the invention can improve the playing effect of music and video and enhance the user experience.
  • the power amplifier circuit in any of the above embodiments can be applied to the power amplifier and electrically connected to the speaker disposed in the power amplifier.
  • the power amplifier circuit includes an overcurrent protection circuit and a current limiting circuit, and the variable second resistor is used to shunt the LLC resonant circuit, and the resistance of the second resistor is adjusted.
  • the value makes the overvoltage protection terminal voltage of the LLC resonant circuit within the threshold voltage range, avoiding problems such as downtime caused by excessive output current of the power supply circuit or burnout of the rear stage circuit board when playing low frequency music and video.
  • the invention can improve the playing effect of music and video and enhance the user experience.
  • the power amplifier circuit in any of the above embodiments can also be applied to a laser television.
  • the power amplifier circuit includes an overcurrent protection circuit and a current limiting circuit, and the variable second resistor is used to shunt the LLC resonant circuit, and the resistance of the second resistor is adjusted.
  • the value makes the overvoltage protection terminal voltage of the LLC resonant circuit within the threshold voltage range, avoiding problems such as downtime caused by excessive output current of the power supply circuit or burnout of the rear stage circuit board when playing low frequency music and video.
  • the invention can improve the playing effect of music and video and enhance the user experience.

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)

Abstract

L'invention concerne un circuit d'amplification de puissance (3), un amplificateur de puissance et une télévision laser. Le circuit d'amplification de puissance (3) comprend : un circuit d'alimentation électrique (300) et un circuit d'attaque d'amplification de puissance (400), le circuit d'alimentation électrique (300) étant électriquement connecté au circuit d'attaque d'amplification de puissance (400); le circuit d'alimentation électrique (300) comprend un circuit résonant LLC (301) et un circuit de protection contre les surintensités (302); le circuit de protection contre les surintensités (302) est connecté en parallèle au circuit résonant LLC (301); le circuit de protection contre les surintensités (302) comprend une première résistance (3021) et une seconde résistance (3022); une première extrémité de la première résistance (3021) est électriquement connectée à une extrémité de sortie du circuit résonant LLC (301); une seconde extrémité de la première résistance (3021) est électriquement connectée à une extrémité de protection contre les surintensités du circuit résonant LLC (301); une première extrémité de la seconde résistance (3022) est connectée électriquement à une extrémité de sortie du circuit résonant LLC (301); une seconde extrémité de la seconde résistance (3022) est mise à la terre; et la seconde résistance (3022) est une résistance variable. Le circuit d'amplification de puissance (3) peut résoudre efficacement des problèmes tels que l'écrasement ou la combustion d'une carte de circuit imprimé d'étage arrière provoquée par la lecture de musique et de vidéos à basse fréquence.
PCT/CN2018/071429 2017-11-01 2018-01-04 Circuit d'amplification de puissance, amplificateur de puissance et télévision laser WO2019085256A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201711067320.9 2017-11-01
CN201711067320.9A CN109756687B (zh) 2017-11-01 2017-11-01 功放电路、功放器和激光电视

Publications (1)

Publication Number Publication Date
WO2019085256A1 true WO2019085256A1 (fr) 2019-05-09

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Application Number Title Priority Date Filing Date
PCT/CN2018/071429 WO2019085256A1 (fr) 2017-11-01 2018-01-04 Circuit d'amplification de puissance, amplificateur de puissance et télévision laser

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CN (1) CN109756687B (fr)
WO (1) WO2019085256A1 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101267166A (zh) * 2008-01-22 2008-09-17 佛山市顺德区瑞德电子实业有限公司 音响功放系统开关电源
CN201294489Y (zh) * 2008-12-04 2009-08-19 深圳创维－Rgb电子有限公司 一种负载电路、电源电路及电子设备
CN202206112U (zh) * 2011-09-09 2012-04-25 佛山国林机电科技有限公司 一种用于高周波焊接机的电火花保护电路
CN204423222U (zh) * 2015-03-04 2015-06-24 西安科技大学 一种直流稳压电源过流保护电路
WO2016000259A1 (fr) * 2014-07-04 2016-01-07 深圳欧陆通电子有限公司 Bloc d'alimentation
CN105245211A (zh) * 2015-10-26 2016-01-13 成都辰来科技有限公司 一种用于fpga芯片的过载保护电路
CN206099774U (zh) * 2016-10-31 2017-04-12 哈尔滨理工大学 一种调频正弦波功率电源电路

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US8178976B2 (en) * 2008-05-12 2012-05-15 Texas Instruments Incorporated IC device having low resistance TSV comprising ground connection
CN101881791B (zh) * 2009-04-30 2015-08-05 日置电机株式会社 电压检测装置
CN102201791B (zh) * 2011-06-10 2013-06-05 无锡友达电子有限公司 Ab类音频功放功率保护装置
US10177716B2 (en) * 2015-10-22 2019-01-08 Skyworks Solutions, Inc. Solder bump placement for emitter-ballasting in flip chip amplifiers

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101267166A (zh) * 2008-01-22 2008-09-17 佛山市顺德区瑞德电子实业有限公司 音响功放系统开关电源
CN201294489Y (zh) * 2008-12-04 2009-08-19 深圳创维－Rgb电子有限公司 一种负载电路、电源电路及电子设备
CN202206112U (zh) * 2011-09-09 2012-04-25 佛山国林机电科技有限公司 一种用于高周波焊接机的电火花保护电路
WO2016000259A1 (fr) * 2014-07-04 2016-01-07 深圳欧陆通电子有限公司 Bloc d'alimentation
CN204423222U (zh) * 2015-03-04 2015-06-24 西安科技大学 一种直流稳压电源过流保护电路
CN105245211A (zh) * 2015-10-26 2016-01-13 成都辰来科技有限公司 一种用于fpga芯片的过载保护电路
CN206099774U (zh) * 2016-10-31 2017-04-12 哈尔滨理工大学 一种调频正弦波功率电源电路

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Publication number Publication date
CN109756687A (zh) 2019-05-14
CN109756687B (zh) 2021-11-12

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