WO2017156707A1 - Dispositif et procédé de protection d'amplificateur de puissance - Google Patents

Dispositif et procédé de protection d'amplificateur de puissance Download PDF

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Publication number
WO2017156707A1
WO2017156707A1 PCT/CN2016/076366 CN2016076366W WO2017156707A1 WO 2017156707 A1 WO2017156707 A1 WO 2017156707A1 CN 2016076366 W CN2016076366 W CN 2016076366W WO 2017156707 A1 WO2017156707 A1 WO 2017156707A1
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WO
WIPO (PCT)
Prior art keywords
power amplifier
power supply
power
current
input
Prior art date
Application number
PCT/CN2016/076366
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English (en)
Chinese (zh)
Inventor
陈士国
Original Assignee
华为技术有限公司
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 华为技术有限公司 filed Critical 华为技术有限公司
Priority to PCT/CN2016/076366 priority Critical patent/WO2017156707A1/fr
Priority to CN201680022144.4A priority patent/CN107534418A/zh
Publication of WO2017156707A1 publication Critical patent/WO2017156707A1/fr

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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
    • H03F1/52—Circuit arrangements for protecting such amplifiers

Definitions

  • the present invention relates to the field of intelligent terminal technologies, and in particular, to a protection device and method for a power amplifier.
  • the most powerful amplifier in the power amplifier PA (Power Amplifier) consists of the most basic bipolar transistor or FET. Among them, whether it is a bipolar transistor or a field effect transistor, there is a breakdown region, such as the N-channel depletion field effect transistor output characteristic curve shown in FIG. 1, when in the breakdown region, the amplifier The current is extremely fast, and the amplifier's PN junction or MOS transistor is easily broken down.
  • the PA is protected by stabilizing the input voltage of the PA, and to some extent, the PA damage caused by the overvoltage is limited, and at the same time, there is a certain influence on the surge and the like. Preventive effect.
  • the prior art only protects at the voltage level. In fact, the rated voltage limits the static operating point of the PA, and the limited voltage limits the application of the PA.
  • the current can also increase rapidly, which is not solved by the regulator protection.
  • the electrostatic discharge ESD Electro-Static discharge
  • the PA which can protect against the influence of lightning and static electricity and protect the PA to a certain extent.
  • ESD protection only works when the voltage is much higher than the rated voltage, usually KV level, and PA does not need such high voltage when it breaks down. Over-current under normal voltage can also penetrate PA, so voltage regulation and ESD protection The PA cannot be fully protected.
  • Embodiments of the present invention provide a protection device and method for a power amplifier, which can comprehensively protect a power amplifier.
  • a protection device for a power amplifier comprising: a current detecting unit for detecting an input current of a power amplifier power supply terminal; and a terminal processing unit, when the input current of the power supply terminal detected by the current detecting unit is greater than a first threshold, Adjusting the input current at the power supply terminal, and/or adjusting the power of the input signal of the power amplifier, and/or adjusting the gain of the power amplifier.
  • the apparatus further includes a power supply circuit for providing an operating voltage to the power amplifier; wherein the power supply circuit includes a first control unit, and the first control unit receives the first output of the terminal processing unit when the input current is greater than the first threshold The control signal limits the current output from the power supply circuit to the power supply terminal of the power amplifier.
  • the power supply circuit includes a first control unit, and the first control unit receives the first output of the terminal processing unit when the input current is greater than the first threshold The control signal limits the current output from the power supply circuit to the power supply terminal of the power amplifier.
  • the apparatus further includes a PA radio frequency input integrated circuit coupled to the radio frequency input end of the power amplifier for providing an input power signal to the power amplifier; wherein the PA radio frequency input integrated circuit includes a second control unit at the input When the current is greater than the first threshold, the second control unit receives the second control signal output by the terminal processing unit, and controls the PA radio frequency input integrated circuit to reduce the output power.
  • a PA radio frequency input integrated circuit coupled to the radio frequency input end of the power amplifier for providing an input power signal to the power amplifier; wherein the PA radio frequency input integrated circuit includes a second control unit at the input When the current is greater than the first threshold, the second control unit receives the second control signal output by the terminal processing unit, and controls the PA radio frequency input integrated circuit to reduce the output power.
  • the power amplifier includes a third control unit, and the third control unit is configured to adjust the PA gain position; the terminal processing unit is further configured to output the third control signal to the third control unit when the input current is greater than the first threshold, The third control signal is used to control the third control unit to lower the gain gear of the power amplifier.
  • the current limiting protection scheme of the power amplifier includes: adjusting the input current of the power supply end of the power amplifier, the power and/or gain of the input signal, and the like.
  • the current limiting protection scheme of one or more of the combined power amplifiers can be selected according to the design requirements to more fully protect the power amplifier from excessive breakdown and operating current.
  • the current detecting unit comprises: a parallel resistance device and a current detecting device, wherein the resistance device is connected in series to the power supply end of the power amplifier, and the current detecting device obtains the input current of the power supply terminal according to the voltage across the resistance device.
  • the resistive device is a varistor.
  • the varistor is more sensitive to voltage changes, and the detected current accuracy is higher than that of the general resistance. At the same time, a varistor with a small resistance can be selected without introducing too much power.
  • a method for protecting a power amplifier comprising: detecting an input current of a power amplifier power supply terminal; adjusting an input current of the power supply terminal when the input current is greater than the first threshold, and/or adjusting a power of the input signal of the power amplifier , and / or adjust the gain of the power amplifier.
  • adjusting the input current of the power supply terminal specifically includes: limiting the current output by the power supply circuit to the power supply end of the power amplifier when the input current is greater than the first threshold; and the power supply circuit provides the operating voltage for the power amplifier.
  • adjusting the input power of the power amplifier's input signal specifically includes: reducing the power of the input signal of the power amplifier when the input current is greater than the first threshold.
  • adjusting the gain of the power amplifier comprises: adjusting the gain position of the power amplifier in combination with the adjustable gain range of the power amplifier when the input current is greater than the first threshold.
  • detecting the input current of the power amplifier power supply end comprises: obtaining an input current of the power supply end according to a voltage across the resistance device connected in series with the power supply unit and the power amplifier power supply end.
  • Embodiments of the present invention provide a protection apparatus and method for a power amplifier, wherein an input current of a power supply terminal is detected; when an input current is greater than a first threshold, an input current of the power supply terminal is adjusted, and/or a power of an input signal of the power amplifier is adjusted. , and / or adjust the gain of the power amplifier. It can be seen that, in the embodiment of the present invention, the input current of the PA power supply end is collected, and it is determined whether it is greater than a certain threshold. If it is greater than, the current limiting measure is enabled to further protect the PA.
  • the PA protection device and method provided by the embodiments of the present invention can effectively prevent the overcurrent breakdown PA and comprehensively protect the PA.
  • 1 is a schematic diagram showing an output characteristic curve of an N-channel depletion field effect transistor
  • FIG. 2 is a structural diagram of a PA protection device according to an embodiment of the present invention.
  • FIG. 3 is a flowchart of a PA protection method according to an embodiment of the present invention.
  • the terminal power amplifier PA mainly includes the following ports:
  • Vcc supply voltage to the amplifier circuit inside the PA
  • Control Unit (control unit 3): is connected to the control unit 3 for adjusting the gain inside the PA, and is a gain adjustment port of the PA, and controls the gain position of the PA;
  • Vbat supply voltage to the control unit 3 inside the PA
  • RFin is the PA RF signal input port
  • RFout is the PA RF signal output port
  • the detection method of the PA output power is specifically as follows: from the PA RF signal output port RFout coupling part PA output power to the CPL end, the coupled partial PA output power is fed back to the terminal processing unit through the external power detecting unit, and the terminal is made The processing unit acquires the output power of the PA.
  • the input current of the Vcc power supply terminal accounts for most of the PA operating current.
  • Vcc directly supplies power to the internal amplification tube of the PA.
  • the input current of the Vcc power supply terminal can be used as a standard for judging the PA operating current.
  • the voltage regulation and the ESD protection cannot fully protect the PA.
  • the embodiment of the present invention collects the input current of the Vcc power supply terminal and determines whether it is greater than a certain threshold. If the current of the PA power supply terminal is greater than a certain threshold, the corresponding limit is enabled. Flow measures to fully protect the PA.
  • FIG. 2 is a structural diagram of a PA protection device according to an embodiment of the present invention, where the device includes:
  • the power supply circuit 21 is configured to provide an operating voltage for the internal circuit of the PA to ensure normal operation of the PA devices, such as an amplifier and the like.
  • the power supply circuit includes a control unit 1 for controlling the current input by the power supply circuit to the PA power supply terminal.
  • the PA RF input integrated circuit RFIC 22 is used to provide input power to the PA, and the output of the PA RF input integrated circuit 22 is connected to the PA RF signal input terminal RFin.
  • the PA radio frequency input integrated circuit includes a control unit 2 for controlling the output power of the PA radio frequency input integrated circuit 22.
  • the current detecting unit 23 is configured to collect an input current of the PA power supply end.
  • the method includes: a current detecting device 230 and a resistance device 231 connected in parallel.
  • the resistor device 231 is connected in series between the power supply circuit 21 and the PA power supply terminal Vcc.
  • the current detecting device 230 is configured to collect the voltage across the resistance device 231, thereby obtaining the current of the PA power supply terminal.
  • the information is sent to the terminal processing unit 24 to take corresponding current limiting measures to protect the PA. In order to avoid the breakdown of its working current is too large.
  • the resistance device 231 needs to have high precision and low power consumption. It is recommended that the resistance device 231 can employ a varistor having a small resistance value, such as a milliohm (m ⁇ ) level. Since the varistor is more sensitive to voltage changes, the detected current accuracy is also higher than the general resistance. At the same time, the varistor with a small resistance does not introduce too much power.
  • a varistor having a small resistance value, such as a milliohm (m ⁇ ) level. Since the varistor is more sensitive to voltage changes, the detected current accuracy is also higher than the general resistance. At the same time, the varistor with a small resistance does not introduce too much power.
  • the input current of the PA power supply terminal detected by the current detecting unit 23 is greater than the first threshold, it is used to adjust the input current of the power supply terminal, and/or adjust the power of the input signal of the power amplifier, and/or adjust the gain of the power amplifier.
  • control unit 1 the control unit 2, and the control unit 3 are respectively the first control list. Element, second control unit and third control unit.
  • the power detecting unit 25 is connected between the PA coupling end CPL and the terminal processing unit 24 for feeding part of the output power of the PA coupled from the PA radio frequency signal output terminal RFout to the terminal processing unit 24 for the terminal processing unit 24 to acquire. PA output power.
  • the current detecting unit 23 when the current detecting unit 23 detects that the current of the PA power supply terminal is greater than the first threshold, it feeds back to the terminal processing unit 24, and the terminal processing unit 24 outputs the control signal Control 1 to the control unit 1 of the power supply circuit 21. Modulate the input current of the PA supply terminal.
  • the control unit 1 receives the Control 1 signal, limits the current output from the power supply circuit 21 to the PA supply terminal, and protects the PA from being broken down.
  • the saturation current of the terminal PA is usually in the range of 100 milliamperes or amps, and the saturation operating current parameters of different PAs may be used. , set different power supply input current threshold.
  • the control unit 1 can include a current limiting device.
  • the first threshold may be a current value threshold preset according to the saturation operating current of the PA, and it may be understood that the first threshold may also be adjusted as needed.
  • the current detecting unit 23 when the current detecting unit 23 detects that the current of the PA power supply terminal is greater than the first threshold, it feeds back to the terminal processing unit 24, and the terminal processing unit 24 outputs the control signal Control 2 to the PA radio frequency input integrated circuit 22.
  • the control unit 2 controls the PA radio frequency input integrated circuit 22 to reduce its output power, that is, to reduce the power input of the PA, and protect the PA from breakdown due to excessive operating current.
  • a relatively safe threshold current can be set for it. Once the PA operating current is greater than the threshold, the output power of the PA power input circuit can be reduced by the terminal processing unit, thereby reducing the operating current to below the threshold current; if the operating current is close to the threshold current, the PA power can also be controlled. Enter the output power of the circuit so that it no longer increases.
  • control unit 3 when the current detecting unit 23 detects that the current of the PA power supply terminal is greater than the first threshold, it feeds back to the terminal processing unit 24, and the terminal processing unit 24 outputs a control signal.
  • Control 3 to PA 20 Control Unit (control unit 3) to adjust the PA gain position control unit 3 evaluates the gain adjustable range of PA according to PA performance and control mechanism, control unit 3 of control PA slightly lowers PA gain file Bit, while avoiding pushing the PA into the low gain saturation region to limit the operating current of the power amplifier and protect the PA from breakdown.
  • the PA has multiple gain gears.
  • the higher the gain of the PA the larger the operating current consumed. Therefore, lowering the PA gain gear reduces the operating current of the PA to a certain extent, and protects the PA from excessive breakdown due to excessive operating current. Therefore, lower the gain position of the PA, and the corresponding PA current consumption will decrease.
  • this method cannot be easily implemented.
  • the PA gain is greatly reduced, which affects the communication performance.
  • the gain is only reduced, it is easy to push the PA into the saturation region under low gain. For the PA, there is still damage. risks of.
  • the protection device for the PA includes three aspects of current limiting measures, which can be selected according to actual design requirements, and the current limiting measures are selected in one aspect to further design the specific device.
  • the first aspect of the embodiment may be selected, and the terminal processing unit outputs the control signal Control 1 to the control unit 1 of the power supply circuit to comprehensively protect the PA;
  • the second aspect of the embodiment may be selected, and the terminal processing unit outputs the control signal Control 2 to the control unit 2 of the PA radio input integrated circuit to comprehensively protect the PA;
  • the third aspect of the embodiment can be selected, and the terminal processing unit outputs the control signals Control 3 to the control unit 3 of the PA to comprehensively protect the PA.
  • the three-way current limiting schemes provided in this embodiment can also be combined.
  • FIG. 3 is a flowchart of a PA protection method according to an embodiment of the present invention, where the method includes:
  • step 300 the input current of the PA power supply terminal is detected.
  • a series resistor device is connected to the PA supply terminal, and the PA is obtained according to the resistance of the resistance device and the voltage across the resistor. Input current at the power supply.
  • the resistance device In order to reduce the influence on the power supply circuit, the resistance device requires high precision and low power consumption.
  • the resistance device 231 employ a varistor having a small resistance value, such as a milliohm (m ⁇ ) level. Since the varistor is more sensitive to voltage changes, the detected current accuracy is also higher than the general resistance. At the same time, the varistor with a small resistance does not introduce too much power.
  • a varistor having a small resistance value such as a milliohm (m ⁇ ) level. Since the varistor is more sensitive to voltage changes, the detected current accuracy is also higher than the general resistance. At the same time, the varistor with a small resistance does not introduce too much power.
  • Step 301 When the input current of the power supply terminal is greater than the first threshold, adjust the input current of the power supply terminal, and/or adjust the power of the input signal of the power amplifier, and/or adjust the gain of the power amplifier.
  • the following current limiting measures may be adopted:
  • control unit 1 in the power supply circuit is controlled to limit the input current of the power supply circuit to the PA power supply terminal, and the PA is protected from being broken due to excessive operating current.
  • control unit 1 can include a current limiting device.
  • control unit 2 of the PA radio input integrated circuit is adjusted to adjust the output power of the PA radio input integrated circuit to protect the PA from being broken due to excessive operating current.
  • the PA RF input integrated circuit provides input power to the PA.
  • the control unit 2 may take the form of software, hardware or a combination of software and hardware, or may exist in other forms.
  • the protection device and method for the PA provided by the embodiment of the invention effectively reduce the PA damage caused by the amplifier entering the breakdown region in the PA or the current is sharply increased.
  • the technical solution of the present invention can also be applied to PA protection in the field of audio and the like, and similar protection methods can also be adopted for some important devices, thereby effectively reducing market failure.

Abstract

L'invention concerne un dispositif et un procédé de protection d'un amplificateur de puissance (20), le dispositif de protection de l'amplificateur de puissance (20) comprenant : une unité de détection de courant (23), destinée à détecter un courant d'entrée de la borne d'alimentation électrique de l'amplificateur de puissance (20) ; une unité de traitement de borne (24) destinée à régler le courant d'entrée de la borne d'alimentation électrique, et/ou régler la puissance d'un signal d'entrée de l'amplificateur de puissance (20), et/ou régler un gain de l'amplificateur de puissance (20), lorsque le courant d'entrée de la borne d'alimentation électrique détecté par l'unité de détection de courant (23) est supérieur à une première valeur seuil. L'invention peut fournir une protection efficace contre une surintensité qui fait disjoncter l'amplificateur de puissance (20), et peut protéger intégralement l'amplificateur de puissance (20).
PCT/CN2016/076366 2016-03-15 2016-03-15 Dispositif et procédé de protection d'amplificateur de puissance WO2017156707A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CN2016/076366 WO2017156707A1 (fr) 2016-03-15 2016-03-15 Dispositif et procédé de protection d'amplificateur de puissance
CN201680022144.4A CN107534418A (zh) 2016-03-15 2016-03-15 功率放大器的保护装置及方法

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2016/076366 WO2017156707A1 (fr) 2016-03-15 2016-03-15 Dispositif et procédé de protection d'amplificateur de puissance

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108880487A (zh) * 2018-06-27 2018-11-23 成都九洲迪飞科技有限责任公司 一种功率放大器保护电路、方法及功率放大电路

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Publication number Priority date Publication date Assignee Title
US7570118B1 (en) * 2007-09-27 2009-08-04 Cirrus Logic, Inc. Thermal overload protection circuit and method for protecting switching power amplifier circuits
CN101656513A (zh) * 2008-08-18 2010-02-24 北京邦讯技术有限公司 保护功率放大器的方法和保护电路
CN102055412A (zh) * 2010-12-02 2011-05-11 华为技术有限公司 一种功率放大器保护电路、通信设备和方法
CN201887469U (zh) * 2010-12-31 2011-06-29 惠州市正源微电子有限公司 射频功率放大器过压保护电路
CN103888088A (zh) * 2014-03-20 2014-06-25 京信通信系统（广州）有限公司 基于alc的功放保护系统
CN203827297U (zh) * 2014-05-15 2014-09-10 京信通信系统（中国）有限公司 前馈功率放大器及保护前馈功率放大器的装置

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Publication number Priority date Publication date Assignee Title
CN201307846Y (zh) * 2008-08-18 2009-09-09 北京邦讯技术有限公司 保护功率放大器的保护电路
CN101938258B (zh) * 2010-08-27 2013-06-05 华为终端有限公司 一种控制射频功率放大器发射信号的方法和装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7570118B1 (en) * 2007-09-27 2009-08-04 Cirrus Logic, Inc. Thermal overload protection circuit and method for protecting switching power amplifier circuits
CN101656513A (zh) * 2008-08-18 2010-02-24 北京邦讯技术有限公司 保护功率放大器的方法和保护电路
CN102055412A (zh) * 2010-12-02 2011-05-11 华为技术有限公司 一种功率放大器保护电路、通信设备和方法
CN201887469U (zh) * 2010-12-31 2011-06-29 惠州市正源微电子有限公司 射频功率放大器过压保护电路
CN103888088A (zh) * 2014-03-20 2014-06-25 京信通信系统（广州）有限公司 基于alc的功放保护系统
CN203827297U (zh) * 2014-05-15 2014-09-10 京信通信系统（中国）有限公司 前馈功率放大器及保护前馈功率放大器的装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108880487A (zh) * 2018-06-27 2018-11-23 成都九洲迪飞科技有限责任公司 一种功率放大器保护电路、方法及功率放大电路

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