CN107534418A - The protection device and method of power amplifier - Google Patents
The protection device and method of power amplifier Download PDFInfo
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- CN107534418A CN107534418A CN201680022144.4A CN201680022144A CN107534418A CN 107534418 A CN107534418 A CN 107534418A CN 201680022144 A CN201680022144 A CN 201680022144A CN 107534418 A CN107534418 A CN 107534418A
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- power amplifier
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- feeder ear
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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
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Abstract
The present invention relates to a kind of protection device of power amplifier and method, the protection device of the power amplifier (20), including：Current detecting unit (23), for detecting the input current of power amplifier (20) feeder ear；Terminal processing units (24); when the input current of the feeder ear of current detecting unit (23) detection is more than first threshold; for adjusting the input current of feeder ear; and/or the power of the input signal of adjustment power amplifier (20); and/or the gain of adjustment power amplifier (20); excessively stream breakdown power amplifier (20) can be effectively prevented, protects power amplifier (20) comprehensively.
Description
The present invention relates to intelligent terminal technical field more particularly to the protective devices and method of power amplifier.
Many devices have certain rated current, if operating current is more than rated current, device has the risk of damage.Typically, amplifier most crucial in power amplifier PA (Power Amplifier) is made of most basic bipolar junction transistor or field-effect tube.Wherein, either double pole triode or field-effect tube, all there is a breakdown region, such as N-channel depletion field effect transistor output characteristic curve shown in FIG. 1, when being in this breakdown region, the very fast increase of the electric current of amplifier, the PN junction or metal-oxide-semiconductor of amplifier are easy to breakdown.
In a kind of power amplifier protection method of the prior art, PA is protected by stablizing the input voltage of PA, to a certain extent, PA is damaged caused by limiting due to over-voltage, meanwhile, surge etc. is influenced, there is certain preventive effect.But the prior art is only protected in voltage level, in fact, voltage rating limits the quiescent point of PA, stop voltage simply limits the application of PA.In addition, near saturation voltage, electric current also can quickly increase a small number of PA due to being influenced by PA individual difference, this is that pressure stabilizing protection is indeterminable.
In the guard method of another power amplifier of the prior art, PA is protected using Electro-static Driven Comb ESD (Electro-Static discharge), the influence of thunder and lightning, electrostatic can be taken precautions against, protect PA to a certain extent.But ESD protection only comes into force in voltage much larger than voltage rating Shi Caineng, usually KV rank, and when PA punctures, does not need such high voltage, the overcurrent under normal pressure can also puncture PA, so pressure stabilizing and ESD protection cannot protect PA comprehensively.
Summary of the invention
The embodiment of the present invention provides the protective device and method of a kind of power amplifier, can protect power amplifier comprehensively.
On the one hand, a kind of protective device of power amplifier is provided, comprising: current detecting unit, for detecting the input current of power amplifier feeder ear；Terminal processing units, when the input current of the feeder ear of current detecting unit detection is greater than first threshold, for adjusting the input current of feeder ear, and/or adjustment power amplifier input signal power, and/or the gain of adjustment power amplifier.
Preferably, which further includes power supply circuit, for providing operating voltage for power amplifier；Wherein, power supply circuit includes first control unit, and when input current is greater than first threshold, first control unit receives the first control signal of terminal processing units output, and limitation power supply circuit is output to the electric current of power amplifier feeder ear.
Preferably, which further includes PA radio frequency input ic, is connected with the rf inputs of the power amplifier, for providing input power signal for power amplifier；Wherein, PA radio frequency input ic includes the second control unit, and when input current is greater than first threshold, the second control unit receives the second control signal of terminal processing units output, and control PA radio frequency input ic reduces output power.
Preferably, power amplifier includes third control unit, and third control unit is for adjusting PA gain shift；Terminal processing units are also used to when input current is greater than first threshold, and output third controls signal to third control unit, and third control signal is for controlling the gain shift that third control unit turns down power amplifier.
It should be noted that the current-limiting protection scheme for the power amplifier that the embodiment of the present invention provides includes: three aspect such as the feeder ear input current of regulation power amplifier, the power of input signal and/or gain.In practical application, the current-limiting protection scheme of one or more of power amplifiers combined can be selected according to the needs of design, more fully to protect power amplifier, in case its operating current is excessive and punctures.
Preferably, current detecting unit includes: resistance device and current detector part in parallel, and resistance device series connection accesses the feeder ear of power amplifier, and current detector part obtains the input current of feeder ear according to the voltage at resistance device both ends.
Preferably, resistance device is varistor.
It should be noted that varistor is higher to the susceptibility of voltage change, the current precision detected is also relatively high using general resistance.Meanwhile the small varistor of resistance value may be selected, too many power consumption will not be introduced.
On the other hand, a kind of guard method of power amplifier is provided, comprising: the input current of detection power amplifier feeder ear；When input current is greater than first threshold, the input current of feeder ear is adjusted, and/or adjust the power of the input signal of power amplifier, and/or the gain of adjustment power amplifier.
Preferably, when input current is greater than first threshold, adjusts the input current of feeder ear, specifically include: when input current is greater than first threshold, limitation power supply circuit is output to the electric current of power amplifier feeder ear；Power supply circuit provides operating voltage for power amplifier.
Preferably, when input current is greater than first threshold, adjust the defeated signal of power amplifier enters power, specifically includes: when input current is greater than first threshold, reducing the power of the input signal of power amplifier.
Preferably, when input current is greater than first threshold, adjust the gain of power amplifier, specifically include: when input current is greater than first threshold, in conjunction with the adjustable gain range of power amplifier, the gain shift of power amplifier is turned down in control.
Preferably, the input current for detecting power amplifier feeder ear, specifically includes: obtaining the input current of feeder ear according to the voltage at the resistance device both ends for being connected on power supply unit and power amplifier feeder ear.
The embodiment of the invention provides a kind of protective device of power amplifier and methods, wherein detects the input current of feeder ear；When input current is greater than first threshold, the input current of feeder ear is adjusted, and/or adjust the power of the input signal of power amplifier, and/or the gain of adjustment power amplifier.Therefore in the embodiment of the present invention, by acquiring the input current of PA feeder ear, and judges whether it is greater than certain thresholding, if it does, enabling current limiting measures, further protect PA.Using PA protective device provided in an embodiment of the present invention and method, it can be effectively prevented overcurrent breakdown PA, protect PA comprehensively.
Fig. 1 is N-channel depletion field effect transistor output characteristic curve schematic diagram；
Fig. 2 is PA protective device architecture diagram provided in an embodiment of the present invention；
Fig. 3 is PA guard method flow chart provided in an embodiment of the present invention.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, following will be combined with the drawings in the embodiments of the present invention, technical scheme in the embodiment of the invention is clearly and completely described, obviously, described embodiments are some of the embodiments of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, every other embodiment obtained by those of ordinary skill in the art without making creative efforts, shall fall within the protection scope of the present invention.
In order to facilitate understanding of embodiments of the present invention, explanation is further explained with specific embodiment below in conjunction with attached drawing, embodiment does not constitute the restriction to the embodiment of the present invention.
Terminal power amplifier PA mainly includes following port:
Vcc: voltage is provided for the amplifying circuit inside PA；
Control Unit (control unit 3): for adjusting the control unit 3 of gain inside connection PA, it is the gain adjustment port of PA, controls to adjust the gain shift of PA；
Vbat: voltage is provided for the control unit 3 inside PA；
RFin: for PA RF signal input end mouth；
RFout: for PA RF signal output mouth；
CPL (Coupling Circuit): for PA coupled end, for detecting PA output power；
It should be noted that, the detection method of PA output power is specific as follows: from PA RF signal output mouth RFout coupling unit PA output power to the end CPL, terminal processing units are allowed to obtain the output power of PA to terminal processing units the part PA output power feedback of coupling by external power detection unit.
The input current of Vcc feeder ear accounts for the major part of PA operating current, and Vcc is directly the amplifier tube power supply inside PA, and the input current of Vcc feeder ear can be used as the standard for judging PA operating current.In order to solve
The problem of pressure stabilizing and ESD protection cannot protect PA comprehensively in the prior art; the embodiment of the present invention judges whether it is greater than certain thresholding by acquiring the input current of Vcc feeder ear, if the electric current of PA feeder ear is greater than certain thresholding; corresponding current limiting measures are enabled, protect PA comprehensively.
It is illustrated by taking Fig. 2 as an example below, Fig. 2 is PA protective device architecture diagram provided in an embodiment of the present invention, wherein the device includes:
Power supply circuit 21 guarantees that PA each proper device operation, such as amplifier etc. work normally for providing operating voltage for PA internal circuit.Wherein, which includes control unit 1, and control unit 1 is for controlling the electric current that power supply circuit is input to PA feeder ear.
PA radio frequency input ic RFIC 22, for providing input power for PA, the output end of PA radio frequency input ic 22 is connect with PA RF signal input end RFin.Wherein, which includes control unit 2, and control unit 2 is used to control the output power of PA radio frequency input ic 22.
Current detecting unit 23, for acquiring the input current of PA feeder ear.It include: current detector part 230 and resistance device 231 in parallel.Wherein, resistance device 231 are connected between power supply circuit 21 and PA feeder ear Vcc.Current detector part 230; for acquiring the voltage at 231 both ends of resistance device, and then the electric current of PA feeder ear is obtained, when the input current of PA feeder ear is greater than first threshold; terminal processing units 24 are sent information to, to take corresponding current limiting measures protection PA in order to avoid its operating current is excessive and breakdown.
It should be noted that in order to reduce the influence to power supply circuit 21, resistance device 231 needs precision with higher, and small power consumption.It is recommended that the lesser varistor of resistance value can be used in resistance device 231, such as milliohm (m Ω) rank.Since susceptibility of the varistor to voltage change is higher, also more general resistance is high for the current precision detected.Meanwhile the varistor that resistance value is lesser, too many power consumption will not be introduced.
Terminal processing units 24 enable current limiting measures, further protect PA when the electric current of PA feeder ear is greater than first threshold.When the input current for the PA feeder ear that current detecting unit 23 detects is greater than first threshold, for adjusting the input current of feeder ear, and/or adjustment power amplifier input signal power, and/or the gain of adjustment power amplifier.
It should be noted that control unit 1, control unit 2 and control unit 3 are respectively that the first control is single
Member, the second control unit and third control unit.
Power detecting unit 25 is connected between PA coupled end CPL and terminal processing units 24, and the part output power of the PA for will couple from PA RF signal output RFout feeds back to terminal processing units 24, and terminal processing units 24 is allowed to obtain the output power of PA.
In the first aspect of the present embodiment, when current detecting unit 23 detects the electric current of PA feeder ear greater than first threshold, terminal processing units 24 are fed back to, the output control of terminal processing units 24 signal Control 1 arrives the control unit 1 of power supply circuit 21, modulates the input current of PA feeder ear.Control unit 1 receives 1 signal of Control, and limitation power supply circuit 21 is output to the electric current of PA feeder ear, protects PA not breakdown.
It should be noted that corresponding to different purposes there are many kinds of the PA as involved in terminal, however, the saturation operating current of usual terminal PA is that hundred milliamperes of grades or peace grade differ, and can set different feeder ear input current thresholdings according to the saturation operating current parameter of different PA.Wherein, which may include current limiting device.
Specifically, first threshold can be the preset current value thresholding of saturation operating current according to PA, also, it is understood that, first threshold can also adjust as needed.
In the second aspect of the present embodiment; when current detecting unit 23 detects the electric current of PA feeder ear greater than first threshold; feed back to terminal processing units 24; the output control of terminal processing units 24 signal Control 2 arrives the control unit 2 of PA radio frequency input ic 22; control PA radio frequency input ic 22 reduces its output power; the power input of PA is reduced, PA is in order to avoid it punctures because operating current is excessive for protection.
It should be noted that being directed to each PA, a comparatively safe threshold current can be set for it.Once PA operating current is greater than the threshold values, the output power of PA power input circuit can be reduced by terminal processing units, so that operating current be made to be reduced to threshold current or less；If operating current allows it not to be further added by close to threshold current, the output power of same controllable PA power input circuit.
In the third aspect of the present embodiment, when current detecting unit 23 detects the electric current of PA feeder ear greater than first threshold, terminal processing units 24, the output control signal of terminal processing units 24 are fed back to
The Control Unit (control unit 3) of Control 3 to PA 20 is to adjust PA gain shift; control unit 3 is according to PA performance and control mechanism; assess the adjustable gain range of PA; the control unit 3 of control PA slightly turns down PA gain shift; the saturation region that PA is pushed into low gain is avoided simultaneously; with the operating current of limiting power amplifier, protect PA not breakdown.
It should be noted that usually PA has multiple gain shifts, typically, when external condition is the same, the gain of PA is higher, and the operating current of consumption is bigger.Therefore the operating current that PA gain shift reduces PA to a certain extent is turned down, PA is in order to avoid its operating current is excessive and punctures for protection.Therefore the gain shift of PA is turned down, corresponding PA consumption stream can reduce.But this method cannot simply be implemented, first PA gain sharp fall, will cause influence to communication performance；Secondly, being easy to the saturation region that PA is pushed under low gain still remaining the risk of damage for PA if only reducing gain.
It should be noted that the protective device for the PA that the embodiment of the present invention provides comprising the current limiting measures of three aspects can be selected according to actual design, and current limiting measures wherein in a certain respect are taken in selection, further design specific device.For example, facilitate limitation power supply circuit be output to the electric current of PA feeder ear in the case where, may be selected the present embodiment in a first aspect, terminal processing units output control signal Control 1 to power supply circuit control unit 1 PA is protected comprehensively；In another example the output power in PA radio frequency input ic is adjustable at one's leisure, the second aspect of the present embodiment may be selected, the control unit 2 of terminal processing units output control signal Control 2 to PA radio frequency input ic protects PA comprehensively；For another example the third aspect of the present embodiment may be selected in the case where PA adjustable gain is high, the control unit 3 of terminal processing units output control signal Control 3 to PA protects PA comprehensively.Meanwhile the current limliting scheme of three aspects that the present embodiment provides can also combine, and pass through deployment unit and combine PA parameter and PA in the specific distribution situation of terminal, flexible allocation specifically uses the protection scheme of which kind of combination.
It being illustrated by taking Fig. 3 as an example below, Fig. 3 is PA guard method flow chart provided in an embodiment of the present invention, this method comprises:
Step 300, the input current of PA feeder ear is detected.
In PA feeder ear series resistance device, PA is obtained according to the resistance value of resistance device and its both end voltage
The input current of feeder ear.In order to reduce the influence to power supply circuit, which needs precision high, low in energy consumption.
Specifically, it is proposed that resistance device 231 uses the lesser varistor of resistance value, such as milliohm (m Ω) rank.Since susceptibility of the varistor to voltage change is higher, also more general resistance is high for the current precision detected.Meanwhile the varistor that resistance value is lesser, too many power consumption will not be introduced.
Step 301, when the input current of feeder ear is greater than first threshold, the input current of feeder ear is adjusted, and/or adjust the power of the input signal of power amplifier, and/or the gain of adjustment power amplifier.
Specifically, when the input current of PA feeder ear is greater than first threshold, following several current limiting measures can be taken:
1, when the input current of PA feeder ear is greater than first threshold, by the control unit 1 in control power supply circuit, to limit the input current that power supply circuit is output to PA feeder ear, protection PA in order to avoid its operating current is excessive and breakdown.Wherein, control unit 1 may include current limiting device.
2, when the input current of PA feeder ear is greater than first threshold, the control unit 2 by controlling PA radio frequency input ic adjusts the output power of PA radio frequency input ic, and PA is in order to avoid its operating current is excessive and breakdown for protection.Wherein, PA radio frequency input ic provides input power for PA.Control unit 2 can take the mode of software, hardware or software and hardware combining, can also exist otherwise.
In one example, when can also set the input current of PA feeder ear more than or equal to first threshold, by the control unit 2 of PA radio frequency input ic, the output power of PA radio frequency input ic is adjusted, i.e., adjusts the input power of PA by control unit 2.Such as: when the input current of PA feeder ear is greater than or equal to first threshold, control PA radio frequency input ic makes its output power slightly reduce or remain unchanged.
3, when the input current of PA feeder ear is greater than first threshold, PA adjustable gain range is assessed in conjunction with to PA performance and mechanism, turn down PA gain shift, guarantee PA gain will not sharp fall and influence communication performance, while PA will not be pushed into the saturation region of low gain and be damaged to.
It should be noted that one of them can may be selected according to actual design flexible choice in above-mentioned 3 kinds of current limliting schemes, while plurality of combination also may be selected, comprehensively protect PA in case its overcurrent puncture.
The protective device and method of PA provided in an embodiment of the present invention is effectively reduced because PA is damaged caused by the amplifier in PA enters breakdown region or electric current increased dramatically.Technical solution of the present invention is also applied in the PA protection in the fields such as audio, for some important devices, can also be used similar guard method, be effectively reduced market failure.
Professional should further appreciate that, unit and algorithm steps described in conjunction with the examples disclosed in the embodiments of the present disclosure, it can be realized with electronic hardware, computer software, or a combination of the two, in order to clearly illustrate the interchangeability of hardware and software, each exemplary composition and step are generally described according to function in the above description.These functions are implemented in hardware or software actually, the specific application and design constraint depending on technical solution.Professional technician can use different methods to achieve the described function each specific application, but such implementation should not be considered as beyond the scope of the present invention.
It is described above; it is merely preferred embodiments of the present invention, but scope of protection of the present invention is not limited thereto, anyone skilled in the art is in the technical scope disclosed by the present invention; any changes or substitutions that can be easily thought of, should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be subject to the protection scope in claims.Technical solution of the present invention is also applied to the PA protection application under the occasions such as the protection of the PA under the occasions such as audio, power conversion application and base station, wireless telecommunications.The PA current limiting protecting method in these fields, as long as the scope protected with same method of the present invention and the present invention.
Claims (12)
- A kind of protective device of power amplifier, which is characterized in that described device includes:Current detecting unit, the input current of the feeder ear for detecting power amplifier；Terminal processing units, when the input current of current detecting unit detection is greater than first threshold, for adjusting the input current of the feeder ear, and/or adjustment power amplifier input signal power, and/or the gain of adjustment power amplifier.
- The apparatus according to claim 1, which is characterized in that described device further include:Power supply circuit, for providing operating voltage for the power amplifier；Wherein, the power supply circuit includes first control unit, when the input current is greater than the first threshold, the first control unit receives the first control signal of the terminal processing units output, limits the electric current that the power supply circuit is output to the power amplifier feeder ear；
- The apparatus according to claim 1, which is characterized in that described device further include:PA radio frequency input ic, is connected with the rf inputs of the power amplifier, for providing input signal for the power amplifier；Wherein, the PA radio frequency input ic includes the second control unit, when the input current is greater than the first threshold, second control unit receives the second control signal of the terminal processing units output, controls the PA radio frequency input ic and reduces output power.
- The apparatus according to claim 1, which is characterized in that the power amplifier includes third control unit, and the third control unit is used to adjust the gain shift of the power amplifier；The terminal processing units are also used to when the input current is greater than the first threshold, and output third controls signal to the third control unit, and the third control signal is for controlling the gain shift that the third control unit turns down the power amplifier.
- Device according to claim 1-4, it is characterized in that, the current detecting unit includes: resistance device and current detector part in parallel, the resistance device series connection accesses the feeder ear, and the current detector part obtains the input current of the feeder ear according to the voltage at the resistance device both ends.
- Device according to claim 5, which is characterized in that the resistance device is varistor.
- A kind of guard method of power amplifier, which is characterized in that the described method includes:Detect the input current of power amplifier feeder ear；When the input current is greater than first threshold, the input current of the feeder ear is adjusted, and/or adjust the power of the input signal of power amplifier, and/or the gain of adjustment power amplifier.
- The method according to the description of claim 7 is characterized in that it is described when the input current is greater than first threshold, the input current of the feeder ear is adjusted, is specifically included:When the input current is greater than first threshold, limitation power supply circuit is output to the electric current of the power amplifier feeder ear；The power supply circuit provides operating voltage for the power amplifier.
- The method according to the description of claim 7 is characterized in that it is described when the input current is greater than first threshold, the power of the input signal of the power amplifier is adjusted, is specifically included:When the input current is greater than first threshold, reduce the power of the input signal of the power amplifier.
- The method according to the description of claim 7 is characterized in that it is described when the input current is greater than first threshold, the gain of the power amplifier is adjusted, is specifically included:When the input current is greater than first threshold, in conjunction with the adjustable gain range of the power amplifier, the gain shift of the power amplifier is turned down.
- According to the described in any item methods of claim 7-10, which is characterized in that the input current of the detection power amplifier feeder ear specifically includes:The input current of the feeder ear is obtained according to the voltage at the resistance device both ends being connected between the power supply circuit and the power amplifier feeder ear.
- According to the method for claim 11, which is characterized in that the resistance device is varistor.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2016/076366 WO2017156707A1 (en) | 2016-03-15 | 2016-03-15 | Protection device and method for power amplifier |
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| CN107534418A true CN107534418A (en) | 2018-01-02 |
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|---|---|---|---|
| CN201680022144.4A Pending CN107534418A (en) | 2016-03-15 | 2016-03-15 | The protection device and method of power amplifier |
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| WO (1) | WO2017156707A1 (en) |
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| CN108880487A (en) * | 2018-06-27 | 2018-11-23 | 成都九洲迪飞科技有限责任公司 | A kind of power amplifier protection circuit, method and power amplification circuit |
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| CN201307846Y (en) * | 2008-08-18 | 2009-09-09 | 北京邦讯技术有限公司 | Protection circuit for protecting power amplifier |
| CN101656513A (en) * | 2008-08-18 | 2010-02-24 | 北京邦讯技术有限公司 | Method for protecting power amplifier and protective circuit |
| CN101938258A (en) * | 2010-08-27 | 2011-01-05 | 华为终端有限公司 | Method and device for controlling radio frequency power amplifier to transmit signal |
| CN103888088A (en) * | 2014-03-20 | 2014-06-25 | 京信通信系统（广州）有限公司 | Power amplifier protection system based on ALC |
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| US7570118B1 (en) * | 2007-09-27 | 2009-08-04 | Cirrus Logic, Inc. | Thermal overload protection circuit and method for protecting switching power amplifier circuits |
| CN102055412B (en) * | 2010-12-02 | 2014-04-16 | 华为技术有限公司 | Power amplifier protective circuit, communication equipment and method |
| CN201887469U (en) * | 2010-12-31 | 2011-06-29 | 惠州市正源微电子有限公司 | Over-voltage protection circuit for radio frequency power amplifier |
| CN203827297U (en) * | 2014-05-15 | 2014-09-10 | 京信通信系统（中国）有限公司 | Feedforward power amplifier and device protecting feedforward power amplifier |
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2016
- 2016-03-15 CN CN201680022144.4A patent/CN107534418A/en active Pending
- 2016-03-15 WO PCT/CN2016/076366 patent/WO2017156707A1/en active Application Filing
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201307846Y (en) * | 2008-08-18 | 2009-09-09 | 北京邦讯技术有限公司 | Protection circuit for protecting power amplifier |
| CN101656513A (en) * | 2008-08-18 | 2010-02-24 | 北京邦讯技术有限公司 | Method for protecting power amplifier and protective circuit |
| CN101938258A (en) * | 2010-08-27 | 2011-01-05 | 华为终端有限公司 | Method and device for controlling radio frequency power amplifier to transmit signal |
| CN101938258B (en) * | 2010-08-27 | 2013-06-05 | 华为终端有限公司 | Method and device for controlling radio frequency power amplifier to transmit signal |
| CN103888088A (en) * | 2014-03-20 | 2014-06-25 | 京信通信系统（广州）有限公司 | Power amplifier protection system based on ALC |
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| WO2017156707A1 (en) | 2017-09-21 |
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Application publication date: 20180102 |