CN102570985B - Power amplifying circuit for powerline multicarrier communication systems - Google Patents
Power amplifying circuit for powerline multicarrier communication systems Download PDFInfo
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- CN102570985B CN102570985B CN201110458555.7A CN201110458555A CN102570985B CN 102570985 B CN102570985 B CN 102570985B CN 201110458555 A CN201110458555 A CN 201110458555A CN 102570985 B CN102570985 B CN 102570985B
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Abstract
The invention discloses a power amplifying circuit for powerline multicarrier communication systems, which comprises a blocking coupled circuit, a biasing circuit, a main amplifying circuit, a power driving class-AB output stage and a feedback control circuit, wherein the blocking coupled circuit comprises a capacitor C1 and a capacitor C3; the biasing circuit comprises a resistor R1 and a resistor R2; the main amplifying circuit comprises a first-level grounded-emitter amplifying stage and a second-level grounded-emitter amplifying stage; the power driving class-AB output stage comprises a NPN-type triode Q3, a resistor R8, a resistor R9, a PNP-type triode Q4 and a resistor R10 which are sequentially connected in series between a power supply VCC and a ground wire GND; and the feedback control circuit comprises a resistor R4, an adjustable resistor R5 and a capacitor C2. According to the power amplifying circuit, as a class-AB push-pull mode is adopted by the driving stage of the power amplifying circuit, the output efficiency is improved; meanwhile, through using a negative feedback connecting mode, the linearity is improved, and the harmonic distortion is reduced, therefore, the power amplifying circuit disclosed by the invention is suitable for broadband signals and multicarrier systems.
Description
Technical field
The invention belongs to electronic technology field, particularly a kind of power amplification circuit for power line multi-carrier communications systems.
Background technology
On electrical network, the random access of various power line loads and power equipment and the variation cutting out have caused power line high frequency equiva lent impedance to change from 0.1 Ω to hundreds of Ω, and power line channel feature complicated and changeable and severe electric line carrier communication environment have proposed requirements at the higher level to the power amplification circuit of carrier signal.The structure of the transmitting terminal of power-line carrier communication system as shown in Figure 1 can be found out, digital signal reverts to analog signal to be sent after by digital to analog converter (DAC) 1 and low pass filter 2, after this analog passband signal overpower amplifier 3 amplifies, is sent on 220V power line and transmits through overcoupled circuits 4.
In prior art, in power-line carrier communication system, conventional scheme is directly carrier signal to be enlarged into switching signal with digital power amplifying circuit to transmit on power line, this method is because harmonic distortion is very large, be only applicable to single-frequency point carrier signal transmission system, be impractical in broadband signal and multicarrier system.
Summary of the invention
In order to solve the problems referred to above of prior art, the object of this invention is to provide a kind of power amplification circuit for power line multi-carrier communications systems, the harmonic distortion while amplification to reduce carrier signal, makes it be applicable to broadband signal and multicarrier system.
To achieve these goals, the invention provides a kind of power amplification circuit for power line multi-carrier communications systems, comprise every straight coupling circuit, biasing circuit, main amplifying circuit, power drive AB class output stage and feedback control circuit, wherein,
Describedly comprise capacitor C 1 and capacitor C 3 every straight coupling circuit, capacitor C 1 is connected in the input of described power amplification circuit, and capacitor C 3 is connected in the output of described power amplification circuit;
Described biasing circuit comprises the resistance R 1 and the resistance R 2 that are connected between power supply VCC and ground wire GND;
Described main amplifying circuit comprises first order cascode amplifying stage and second level cascode amplifying stage, described first order cascode amplifying stage comprises NPN type triode Q1 and resistance R 3, resistance R 3 is connected between power supply VCC and the collector electrode of triode Q1, the base stage of triode Q1 connects the node between resistance R 1 and resistance R 2 in described biasing circuit, and the emitter of triode Q1 connects the node between resistance R 4 and adjustable resistance R5 in described feedback control circuit; Described second level cascode amplifying stage comprises positive-negative-positive triode Q2, diode D1, adjustable resistance R6 and the resistance R 7 between power supply VCC and ground wire GND in sequential series, the collector electrode of the base stage connecting triode Q1 of triode Q2, the emitter of triode Q2 connects power supply VCC, and the collector electrode of triode Q2 connects diode D1;
Described power drive AB class output stage comprises NPN type triode Q3, resistance R 8, resistance R 9, positive-negative-positive triode Q4 and the resistance R 10 between power supply VCC and ground wire GND in sequential series, the collector electrode of the base stage connecting triode Q2 of triode Q3, the collector electrode of triode Q3 connects power supply VCC, the emitter contact resistance R8 of triode Q3, the base stage of triode Q4 connects the node between adjustable resistance R6 and resistance R 7 in the cascode amplifying stage of the described second level, the collector electrode contact resistance R10 of triode Q4, the emitter contact resistance R9 of triode Q4;
Described feedback control circuit comprises resistance R 4, adjustable resistance R5 and capacitor C 2, and adjustable resistance R5, resistance R 4 and capacitor C 2 are in sequential series in described power drive AB class output stage between the node and ground wire GND between resistance R 8 and resistance R 9.
Compared with prior art, the present invention has following beneficial effect: power amplification circuit of the present invention is because its driving stage adopts AB class push pull mode, increase delivery efficiency, improved the linearity by negative feedback connected mode simultaneously, thereby the harmonic distortion while having reduced to amplify carrier signal, is therefore applicable to broadband signal and multicarrier system.
Brief description of the drawings
Fig. 1 is the structured flowchart of the transmitting terminal of power-line carrier communication system.
Fig. 2 is the circuit structure diagram of the power amplification circuit for power line multi-carrier communications systems of the present invention.
Main description of reference numerals:
1, digital to analog converter 2, low pass filter
3, power amplification circuit 4, coupling circuit
31, every straight coupling circuit 32, biasing circuit
331, first order cascode amplifying stage 332, second level cascode amplifying stage
34, power drive AB class output stage 35, feedback control circuit
Embodiment
Below in conjunction with accompanying drawing, specific embodiments of the invention are elaborated.
As shown in Figure 2, the power amplification circuit for power line multi-carrier communications systems of the present invention comprises every straight coupling circuit 31, biasing circuit 32, main amplifying circuit, power drive AB class output stage 34 and feedback control circuit 35, wherein,
Describedly comprise two capacitor C 1 and C3 every straight coupling circuit 31, capacitor C 1 is connected in the input In of described power amplification circuit, and capacitor C 3 is connected in the output Out of described power amplification circuit; The input In of described power amplification circuit receives the analog signal to be sent of low pass filter output, and the output signal of the output Out of described power amplification circuit is coupled on 220V power line and transmits through overcoupled circuits.
Described biasing circuit 32 comprises the resistance R 1 and the resistance R 2 that are connected between power supply VCC and ground wire GND;
Described main amplifying circuit comprises first order cascode amplifying stage 331 and second level cascode amplifying stage 332, described first order cascode amplifying stage 331 comprises NPN type triode Q1 and resistance R 3, resistance R 3 is connected between power supply VCC and the collector electrode of triode Q1, the base stage of triode Q1 connects the node between resistance R 1 and resistance R 2 in described biasing circuit 32, and the emitter of triode Q1 connects the node between resistance R 4 and adjustable resistance R5 in described feedback control circuit 35; Described second level cascode amplifying stage 332 comprises positive-negative-positive triode Q2, diode D1, adjustable resistance R6 and the resistance R 7 between power supply VCC and ground wire GND in sequential series, the collector electrode of the base stage connecting triode Q1 of triode Q2, the emitter of triode Q2 connects power supply VCC, and the collector electrode of triode Q2 connects diode D1;
Described power drive AB class output stage 34 comprises NPN type triode Q3, resistance R 8, resistance R 9, positive-negative-positive triode Q4 and the resistance R 10 between power supply VCC and ground wire GND in sequential series, the collector electrode of the base stage connecting triode Q2 of triode Q3, the collector electrode of triode Q3 connects power supply VCC, the emitter contact resistance R8 of triode Q3, the base stage of triode Q4 connects the node between adjustable resistance R6 and resistance R 7 in the cascode amplifying stage 332 of the described second level, the collector electrode contact resistance R10 of triode Q4, the emitter contact resistance R9 of triode Q4;
Described feedback control circuit 35 comprises resistance R 4, adjustable resistance R5 and capacitor C 2, and adjustable resistance R5, resistance R 4 and capacitor C 2 are in sequential series in described power drive AB class output stage 34 between the node and ground wire GND between resistance R 8 and resistance R 9.
The closed loop gain A of the power amplification circuit for power line multi-carrier communications systems of the present invention is:
Can be found out by formula (1), the closed loop gain A of power amplification circuit of the present invention is directly proportional to the resistance of adjustable resistance R5, can regulate closed loop gain A by the resistance that regulates adjustable resistance R5, conventionally makes A=3～4.
Adjustable resistance R6 is for regulating the quiescent bias current of described power drive AB class output stage 34, if the quiescent bias current of described power drive AB class output stage 34 too conference causes energy transmission efficiency to decline, if too little meeting causes more serious intermodulation distortion and can not drive very heavy load, therefore, adjustable resistance R6 selects suitable resistance value very important to power amplifier performance parameter, in the present embodiment, the quiescent bias current of described power drive AB class output stage 34 is 20mA.
Resistance R 10 is for detection of the power of described power drive AB class output stage 34, and in the present embodiment, as preferred embodiment, its resistance is 1 Ω; Capacitor C 2 forms single order high pass filter with resistance R 4, and it has inhibitory action to low-frequency noise, and in the present embodiment, as preferred embodiment, capacitor C 2 is arranged on 100KHz with the cut-off frequency of the single order high pass filter of resistance R 4; Known according to formula (1), determined by the ratio of adjustable resistance R5 and resistance R 4 in the gain of logical inband signaling; Triode Q3 and triode Q4 are high-power driving triodes, and allowing the maximum current passing through is 3A.
Power amplification circuit of the present invention is coupled on power line and is transmitted by coupling circuit after the analog signal of the transmitting terminal of power line multi-carrier communications systems is amplified, because its driving stage adopts AB class push pull mode, increase delivery efficiency, improved the linearity by negative feedback connected mode simultaneously, thereby the harmonic distortion while having reduced to amplify carrier signal, is therefore applicable to broadband signal and multicarrier system.
Above embodiment is only exemplary embodiment of the present invention, is not used in restriction the present invention, and protection scope of the present invention is defined by the claims.Those skilled in the art can, in essence of the present invention and protection range, make various amendments or be equal to replacement the present invention, this amendment or be equal to replacement and also should be considered as dropping in protection scope of the present invention.
Claims (1)
1. for a power amplification circuit for power line multi-carrier communications systems, it is characterized in that, described power amplification circuit comprises every straight coupling circuit, biasing circuit, main amplifying circuit, power drive AB class output stage and feedback control circuit, wherein,
Describedly comprise capacitor C 1 and capacitor C 3 every straight coupling circuit;
Described biasing circuit comprises the resistance R 1 and the resistance R 2 that are connected between power supply VCC and ground wire GND;
Described main amplifying circuit comprises first order cascode amplifying stage and second level cascode amplifying stage, described first order cascode amplifying stage comprises NPN type triode Q1 and resistance R 3, resistance R 3 is connected between power supply VCC and the collector electrode of triode Q1, the base stage of triode Q1 connects the node between resistance R 1 and resistance R 2 in described biasing circuit, and the emitter of triode Q1 connects the node between resistance R 4 and adjustable resistance R5 in described feedback control circuit; Described second level cascode amplifying stage comprises positive-negative-positive triode Q2, diode D1, adjustable resistance R6 and the resistance R 7 between power supply VCC and ground wire GND in sequential series, the collector electrode of the base stage connecting triode Q1 of triode Q2, the emitter of triode Q2 connects power supply VCC, and the collector electrode of triode Q2 connects diode D1;
Described power drive AB class output stage comprises NPN type triode Q3, resistance R 8, resistance R 9, positive-negative-positive triode Q4 and the resistance R 10 between power supply VCC and ground wire GND in sequential series, the collector electrode of the base stage connecting triode Q2 of triode Q3, the collector electrode of triode Q3 connects power supply VCC, the emitter contact resistance R8 of triode Q3, the base stage of triode Q4 connects the node between adjustable resistance R6 and resistance R 7 in the cascode amplifying stage of the described second level, the collector electrode contact resistance R10 of triode Q4, the emitter contact resistance R9 of triode Q4;
Described feedback control circuit comprises resistance R 4, adjustable resistance R5 and capacitor C 2, and adjustable resistance R5, resistance R 4 and capacitor C 2 are in sequential series in described power drive AB class output stage between the node and ground wire GND between resistance R 8 and resistance R 9;
Described capacitor C 1 is connected between the input of described power amplification circuit and the base stage of described triode Q1, and described capacitor C 3 is connected between the node between output and resistance R 8 and the resistance R 9 of described power amplification circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110458555.7A CN102570985B (en) | 2011-12-31 | 2011-12-31 | Power amplifying circuit for powerline multicarrier communication systems |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110458555.7A CN102570985B (en) | 2011-12-31 | 2011-12-31 | Power amplifying circuit for powerline multicarrier communication systems |
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| CN102570985A CN102570985A (en) | 2012-07-11 |
| CN102570985B true CN102570985B (en) | 2014-08-06 |
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| CN103023439B (en) * | 2012-12-14 | 2015-10-28 | 山东电力集团公司电力科学研究院 | A kind of power amplifying system for intelligent substation test system |
| CN103338012B (en) * | 2013-06-28 | 2016-01-20 | 盛吉高科（北京）科技有限公司 | A kind of current-limited power amplification driving circuit of power line carrier communication |
| CN103338060B (en) * | 2013-07-10 | 2016-01-06 | 北京博纳电气股份有限公司 | Based on the input signal protective circuit of power carrier communication |
| CN103646531A (en) * | 2013-12-26 | 2014-03-19 | 威海北洋电气集团股份有限公司 | Mine personnel positioning device and method based on infrared sensors |
| CN112532193A (en) * | 2020-11-06 | 2021-03-19 | 深圳飞骧科技有限公司 | Transistor amplifier, chip and electronic equipment based on diode feedback |
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| US5493255A (en) * | 1995-03-21 | 1996-02-20 | Nokia Mobile Phones Ltd. | Bias control circuit for an RF power amplifier |
| CN200976570Y (en) * | 2006-11-24 | 2007-11-14 | 华中科技大学 | High-frequency power amplifier circuit |
| CN201226507Y (en) * | 2008-07-01 | 2009-04-22 | 深圳市九茂三水电气有限公司 | Power amplification circuit for power line carrier communication |
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