CN105743444B - Power amplifier - Google Patents
Power amplifier Download PDFInfo
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- CN105743444B CN105743444B CN201610070535.5A CN201610070535A CN105743444B CN 105743444 B CN105743444 B CN 105743444B CN 201610070535 A CN201610070535 A CN 201610070535A CN 105743444 B CN105743444 B CN 105743444B
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- 230000003321 amplification Effects 0.000 description 47
- 238000003199 nucleic acid amplification method Methods 0.000 description 47
- 238000004804 winding Methods 0.000 description 20
- 230000005611 electricity Effects 0.000 description 12
- 238000010248 power generation Methods 0.000 description 12
- 230000005669 field effect Effects 0.000 description 9
- 230000000295 complement effect Effects 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 229920006395 saturated elastomer Polymers 0.000 description 3
- 239000000203 mixture Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000004146 energy storage Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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- 230000000087 stabilizing effect Effects 0.000 description 1
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Classifications
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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
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
- H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
- H03F1/0211—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the supply voltage or current
-
- 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
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Abstract
The invention discloses a kind of power amplifiers, including class AB power amplification circuit, first switch power supply and second switch power supply, class AB power amplification circuit includes the NPN type power tube of symmetrical complement and positive-negative-positive power tube, first control terminal of first switch power supply is connected with the collector of NPN type power tube, second control terminal is connected with the emitter of NPN type power tube, the output terminal of first switch power supply provides the positive supply that the output voltage of voltage follow NPN type power tube changes for class AB power amplification circuit, first control terminal of second switch power supply is connected with the collector of positive-negative-positive power tube, second control terminal is connected with the emitter of positive-negative-positive power tube, the output terminal of second switch power supply provides the negative supply that the output voltage of voltage follow positive-negative-positive power tube changes for class AB power amplification circuit.The present invention can realize high fidelity and high efficiency simultaneously, can be widely applied in audio industry.
Description
Technical field
The present invention relates to sound equipment power amplifier technology field, more particularly to a kind of power amplifier.
Background technology
In currently a popular rear class power amplification circuit, there is the class AB compared with high-fidelity（AB classes）, also have efficient fourth
Class（D classes）.In class AB power amplifier, base is added in using two power tube symmetrical operations, and to two Push-Pull power pipes
This operating current solves intermodulation distortion, and fidelity is very high.But such circuit efficiency is relatively low, theoretical average efficiency is less than 50%, this
It is because power tube works in linear mode, when by voltage output, to during load, more pressure drops need power tube to bear.And fourth
Class power amplifier is worked with PWM mode, first shows analog quantity with pulse mode, then pulse signal is filtered with passive device
Ripple is reduced into gentle analog quantity, is output to loudspeaker, and power tube only has on off state, therefore efficiency is very high, is theoretically close to 100%.
It is well known that the distorted signals of such mode is more serious, including distortion, noise, residual carrier etc..Generally speaking, pass
In the power amplifier of system, there are contradictions between high-fidelity and high efficiency, it is difficult to be realized on the premise of higher fidelity is kept high
Efficiency.
The content of the invention
In order to solve the technical issues of above-mentioned, the object of the present invention is to provide a kind of new power amplifiers.
The technical solution adopted by the present invention to solve the technical problems is：
Power amplifier, including class AB power amplification circuit, first switch power supply and second switch power supply, the class AB
Power amplification circuit includes the NPN type power tube of symmetrical complement and positive-negative-positive power tube, the first control of the first switch power supply
End is connected with the collector of NPN type power tube, and the second control terminal is connected with the emitter of NPN type power tube, the first switch
The output terminal of power supply provides the positive electricity that the output voltage of voltage follow NPN type power tube changes for class AB power amplification circuit
Source, the first control terminal of the second switch power supply are connected with the collector of positive-negative-positive power tube, the second control terminal and positive-negative-positive work(
The emitter connection of rate pipe, the output terminal of the second switch power supply provide voltage follow PNP for class AB power amplification circuit
The output voltage of type power tube and the negative supply changed.
Further, the first switch power supply includes the first photo-coupler, the first pwm chip, the first power switch
Pipe, the first inductance, the first capacitance, the first diode, the first zener diode and first resistor, first photo-coupler it is defeated
Enter to hold the anode of diode to be connected with the anode of the first zener diode, the first electricity of cathode connection of first zener diode
The first control terminal after resistance as first switch power supply, the cathode of the input terminal diode of first photo-coupler is as first
Second control terminal of Switching Power Supply；
The collector of the output terminal triode of first photo-coupler is connected with the control terminal of the first pwm chip,
The output terminal of first pwm chip is connected with the grid of the first power switch pipe, the leakage of first power switch pipe
Pole is connected with positive power supply, and the one end of source electrode respectively with the cathode of the first diode and the first inductance is connected, and the described 1st
The anode of pole pipe is connected with one end of the first capacitance and connecting node is connected with negative power supply, the other end of first capacitance
It is connected with the other end of the first inductance and output terminal of the connecting node as first switch power supply.
Further, the second switch power supply includes the second photo-coupler, the second pwm chip, the second power switch
Pipe, the second inductance, the second capacitance, the second diode, the second zener diode and second resistance, second photo-coupler it is defeated
Enter to hold the anode of diode to be connected with the anode of the second zener diode, the second electricity of cathode connection of second zener diode
The second control terminal after resistance as second switch power supply, the cathode of the input terminal diode of second photo-coupler is as second
First control terminal of Switching Power Supply；
The collector of the output terminal triode of second photo-coupler is connected with the control terminal of the second pwm chip,
The output terminal of second pwm chip is connected with the grid of the second power switch pipe, the source of second power switch pipe
Pole is connected with negative power supply, and the one end respectively with the anode of the second diode and the second inductance that drains is connected, and the described 2nd 2
The cathode of pole pipe is connected with one end of the second capacitance and connecting node is connected with positive power supply, the other end of second capacitance
It is connected with the other end of the second inductance and output terminal of the connecting node as second switch power supply.
Further, the class AB power amplification circuit further includes the 3rd diode, the 4th diode, 3rd resistor and
Four resistance, the anode of the 3rd diode are connected with the base stage of NPN type power tube, and cathode is connected with the anode of the 4th diode
Input signal is followed by, the cathode of the 4th diode is connected with the base stage of positive-negative-positive power tube, the collection of the NPN type power tube
Electrode is connected with positive supply, and one end of the 3rd resistor is connected with the emitter of NPN type power tube, the other end and the 4th resistance
One end connection after signal output part as class AB power amplification circuit, the other end of the 4th resistance and positive-negative-positive work(
The emitter connection of rate pipe, the collector of the positive-negative-positive power tube are connected with negative supply.
Further, the class AB power amplification circuit further includes operational amplifier, the 9th resistance and the tenth resistance, described
The homophase input termination input signal of operational amplifier, output terminal are connected with the cathode of the 3rd diode, the tenth resistance
The inverting input of one end and operational amplifier connects, and the other end is connected with signal output part, the reverse phase of the operational amplifier
Input terminal passes through the 9th resistance eutral grounding.
Further, the first switch power supply includes the 3rd photo-coupler, the first half-bridge pwm chip, the 3rd power
Switching tube, the 4th power switch pipe, the first transformer, the 3rd inductance, the 3rd capacitance, the 3rd zener diode, the 7th resistance and
First rectifier bridge, the anode of the input terminal diode of the 3rd photo-coupler are connected with the anode of the 3rd zener diode, institute
The cathode for stating the 3rd zener diode connects the first control terminal as first switch power supply after the 7th resistance, the 3rd optocoupler
Second control terminal of the cathode of the input terminal diode of clutch as first switch power supply；
The collector of the output terminal triode of 3rd photo-coupler and the control terminal of the first half-bridge pwm chip connect
It connects, the upper half-bridge control terminal of the first half-bridge pwm chip is connected with the grid of the 3rd power switch pipe, the 3rd work(
The drain electrode of rate switching tube is connected with positive power supply, the source electrode bridge contact and the 4th work(with the first half-bridge pwm chip respectively
The drain electrode of rate switching tube connects and connecting node is connected with the one side of the primary side winding of the first transformer, first transformer
The opposite side of primary side winding is connected respectively with positive power supply and negative power supply, under the first half-bridge pwm chip
Half-bridge control terminal is connected with the grid of the 4th power switch pipe, and source electrode and the negative power supply of the 4th power switch pipe connect
It connects；
The both ends of the vice-side winding of first transformer are connected with two input terminals of the first rectifier bridge, first rectification
The positive output end of bridge is connected with one end of the 3rd inductance, and negative output terminal is connected with one end of the 3rd capacitance, the 3rd inductance
The other end is connected with the other end of the 3rd capacitance and output terminal of the connecting node as first switch power supply.
Further, the second switch power supply includes the 4th photo-coupler, the second half-bridge pwm chip, the 5th power
Switching tube, the 6th power switch pipe, the second transformer, the 4th inductance, the 4th capacitance, the 4th zener diode, the 8th resistance and
Second rectifier bridge, the anode of the input terminal diode of the 4th photo-coupler are connected with the anode of the 4th zener diode, institute
The cathode for stating the 4th zener diode connects the second control terminal as second switch power supply after the 8th resistance, the 4th optocoupler
First control terminal of the cathode of the input terminal diode of clutch as second switch power supply；
The collector of the output terminal triode of 4th photo-coupler and the control terminal of the second half-bridge pwm chip connect
It connects, the upper half-bridge control terminal of the second half-bridge pwm chip is connected with the grid of the 5th power switch pipe, the 5th work(
The drain electrode of rate switching tube is connected with positive power supply, the source electrode bridge contact and the 6th work(with the second half-bridge pwm chip respectively
The drain electrode of rate switching tube connects and connecting node is connected with the one side of the primary side winding of the second transformer, second transformer
The opposite side of primary side winding is connected respectively with positive power supply and negative power supply, under the second half-bridge pwm chip
Half-bridge control terminal is connected with the grid of the 6th power switch pipe, and source electrode and the negative power supply of the 6th power switch pipe connect
It connects；
The both ends of the vice-side winding of second transformer are connected with two input terminals of the second rectifier bridge, second rectification
The positive output end of bridge passes sequentially through the 4th inductance and the 4th capacitance is connected with negative output terminal, and negative output terminal is as second switch electricity
The output terminal in source.
The beneficial effects of the invention are as follows：The power amplifier of the present invention, including class AB power amplification circuit, first switch electricity
Source and second switch power supply, class AB power amplification circuit include the NPN type power tube of symmetrical complement and positive-negative-positive power tube, the
First control terminal of one Switching Power Supply is connected with the collector of NPN type power tube, the second control terminal and the transmitting of NPN type power tube
Pole connects, and the output terminal of first switch power supply provides the output of voltage follow NPN type power tube for class AB power amplification circuit
Voltage and the positive supply changed, the first control terminal of second switch power supply are connected with the collector of positive-negative-positive power tube, second control
End is connected with the emitter of positive-negative-positive power tube, and the output terminal of second switch power supply provides voltage for class AB power amplification circuit
The negative supply for following the output voltage of positive-negative-positive power tube and changing will be guaranteed, simultaneously so as to the fidelity of this power amplifier
High efficiency is realized, therefore, this power amplifier can realize high fidelity and high efficiency simultaneously.
Description of the drawings
The invention will be further described with reference to the accompanying drawings and examples.
Fig. 1 is the physical circuit figure of the embodiment two of the power amplifier of the present invention；
Fig. 2 is the oscillogram of the output voltage of traditional class AB power amplifier；
Fig. 3 is the oscillogram of the output voltage of the power amplifier of the embodiment of the present invention two；
Fig. 4 is the physical circuit figure of the embodiment three of the power amplifier of the present invention；
Fig. 5 is the oscillogram of the output voltage of the power amplifier of the embodiment of the present invention three.
Specific embodiment
The present invention provides a kind of power amplifiers, are opened including class AB power amplification circuit, first switch power supply and second
Powered-down source, with reference to Fig. 1 and Fig. 4, the class AB power amplification circuit includes the NPN type power tube Q3 and positive-negative-positive of symmetrical complement
Power tube Q4, the first control terminal of the first switch power supply are connected with the collector of NPN type power tube Q3, the second control terminal with
The emitter connection of NPN type power tube Q3, the output terminal of the first switch power supply provide electricity for class AB power amplification circuit
Pressure follows the output voltage of NPN type power tube Q3 and the positive supply VD+ that changes, the first control terminal of the second switch power supply with
The collector connection of positive-negative-positive power tube Q4, the second control terminal are connected with the emitter of positive-negative-positive power tube Q4, the second switch
The output terminal of power supply for class AB power amplification circuit provide the output voltage of voltage follow positive-negative-positive power tube Q4 change it is negative
Power vd-.The transmitting of power tube Q3, Q4 extremely signal output part, output voltage refer to emitter output voltage, power tube Q3,
Q4 is operated in amplification region during non-saturated region, and the current potential of emitter is variation, and the voltage between collector-emitter is opposite
Stablize, therefore, collector follows emitter to change, and is simply higher by a fixed value.In order to ensure the current collection of power tube Q3, Q4
Pole-emitter voltage is stablized and power tube is caused to be operated in amplification region, first switch power supply and second switch power supply point relatively
The power supply that the output voltage of power tube is followed to change is not provided for power tube.
Be further used as preferred embodiment, with reference to Fig. 1, the first switch power supply include the first photo-coupler U2,
First pwm chip U1, the first power switch pipe Q1, the first inductance L1, the first capacitance C1, the first diode D1, first are surely
Press diode Z1 and first resistor R1, the anode and the first zener diode of the input terminal diode of the first photo-coupler U2
The anode connection of Z1, after the cathode connection first resistor R1 of the first zener diode Z1 as first switch power supply first
Control terminal, the second control terminal of the cathode of the input terminal diode of the first photo-coupler U2 as first switch power supply；
The collector of the output terminal triode of the first photo-coupler U2 and the control terminal of the first pwm chip U1 connect
It connects, the output terminal of the first pwm chip U1 is connected with the grid of the first power switch pipe Q1, first power switch
The drain electrode of pipe Q1 is connected with positive power supply VS+, source electrode one end with the cathode of the first diode D1 and the first inductance L1 respectively
Connection, the anode of the first diode D1 is connected with one end of the first capacitance C1 and connecting node connects with negative power supply VS-
It connects, the other end of the first capacitance C1 is connected with the other end of the first inductance L1 and connecting node is as first switch power supply
Output terminal.
Preferred embodiment is further used as, the second switch power supply is controlled including the second photo-coupler U4, the 2nd PWM
Coremaking piece U3, the second power switch pipe Q2, the second inductance L2, the second capacitance C2, the second diode D2, the second zener diode Z2
With second resistance R2, the anode of the input terminal diode of the second photo-coupler U4 and the anode of the second zener diode Z2 connect
It connects, the second control terminal after the cathode connection second resistance R2 of the second zener diode Z2 as second switch power supply, institute
State first control terminal of the cathode as second switch power supply of the input terminal diode of the second photo-coupler U4；
The collector of the output terminal triode of the second photo-coupler U4 and the control terminal of the second pwm chip U3 connect
It connects, the output terminal of the second pwm chip U3 is connected with the grid of the second power switch pipe Q2, second power switch
The source electrode of pipe Q2 is connected with negative power supply VS+, and drain one end with the anode of the second diode D2 and the second inductance L2 respectively
Connection, the cathode of the second diode D2 is connected with one end of the second capacitance C2 and connecting node connects with positive power supply VS+
It connects, the other end of the second capacitance C2 is connected with the other end of the second inductance L2 and connecting node is as second switch power supply
Output terminal.
Preferred embodiment is further used as, the class AB power amplification circuit further includes the 3rd diode D3,
Four diode D4,3rd resistor R3 and the 4th resistance R4, the anode of the 3rd diode D3 and the base stage of NPN type power tube Q3
Connection, cathode are connected with the anode of the 4th diode D4 and are followed by input signal, cathode and the positive-negative-positive work(of the 4th diode D4
The base stage connection of rate pipe Q4, the collector of the NPN type power tube Q3 are connected VD+ with positive supply, and the one of the 3rd resistor R3
End is connected with the emitter of NPN type power tube Q3, and the other end is put after being connected with one end of the 4th resistance R4 as class AB power
The signal output part of big circuit, the other end of the 4th resistance R4 are connected with the emitter of positive-negative-positive power tube Q4, the PNP
The collector of type power tube Q4 is connected with negative supply VD-.
Preferred embodiment is further used as, with reference to Fig. 4, the class AB power amplification circuit further includes operation amplifier
Device U, the 9th resistance R9 and the tenth resistance R10, the homophase input termination input signal of the operational amplifier U, output terminal and the
The cathode connection of three diode D3, one end of the tenth resistance R10 is connected with the inverting input of operational amplifier U, another
End is connected with signal output part, and the inverting input of the operational amplifier U is grounded by the 9th resistance R9.
Preferred embodiment is further used as, the first switch power supply includes the 3rd photo-coupler U5, the first half-bridge
Pwm chip U7, the 3rd power switch pipe Q5, the 4th power switch pipe Q6, the first transformer T1, the 3rd inductance L3, the 3rd
Capacitance C3, the 3rd zener diode Z3, the 7th resistance R7 and the first rectifier bridge, two pole of input terminal of the 3rd photo-coupler U5
The anode of pipe is connected with the anode of the 3rd zener diode Z3, and the cathode of the 3rd zener diode Z3 connects the 7th resistance R7
The first control terminal as first switch power supply afterwards, the cathode of the input terminal diode of the 3rd photo-coupler U5 is as first
Second control terminal of Switching Power Supply；
The input of the collector of the output terminal triode of the 3rd photo-coupler U5 and the first half-bridge pwm chip U7
End connection, the upper half-bridge control terminal of the first half-bridge pwm chip U7 are connected with the grid of the 3rd power switch pipe Q5, institute
The collector for stating the 3rd power switch pipe Q5 is connected with positive power supply VS+, source electrode respectively with the first half-bridge pwm chip U7
Bridge contact and the 4th power switch pipe Q6 collector connection and the primary side winding of connecting node and the first transformer T1 one
Side connects, the opposite side of the primary side winding of the first transformer T1 respectively with positive power supply VS+ and negative power supply VS-
Connection, the lower half-bridge control terminal of the first half-bridge pwm chip U7 is connected with the grid of the 4th power switch pipe Q6, described
The emitter of 4th power switch pipe Q6 is connected with negative power supply VS-；
The both ends of vice-side winding of the first transformer T1 are connected with two input terminals of the first rectifier bridge, and described first is whole
The positive output end of stream bridge is connected with one end of the 3rd inductance L3, and negative output terminal is connected with one end of the 3rd capacitance C3, and the described 3rd
The other end of inductance L3 is connected with the other end of the 3rd capacitance C3 and output terminal of the connecting node as first switch power supply.
Preferred embodiment is further used as, the second switch power supply includes the 4th photo-coupler U6, the second half-bridge
Pwm chip U8, the 5th power switch pipe Q7, the 6th power switch pipe Q8, the second transformer T2, the 4th inductance L4, the 4th
Capacitance C4, the 4th zener diode Z4, the 8th resistance R8 and the second rectifier bridge, two pole of input terminal of the 4th photo-coupler U6
The anode of pipe is connected with the anode of the 4th zener diode Z4, and the cathode of the 4th zener diode Z4 connects the 8th resistance R8
The second control terminal as second switch power supply afterwards, the cathode of the input terminal diode of the 4th photo-coupler U6 is as second
First control terminal of Switching Power Supply；
The input of the collector of the output terminal triode of the 4th photo-coupler U6 and the second half-bridge pwm chip U8
End connection, the upper half-bridge control terminal of the second half-bridge pwm chip U8 are connected with the grid of the 5th power switch pipe Q7, institute
The collector for stating the 5th power switch pipe Q7 is connected with positive power supply VS+, source electrode respectively with the second half-bridge pwm chip U8
Bridge contact and the 6th power switch pipe Q8 collector connection and the primary side winding of connecting node and the second transformer T2 one
Side connects, the opposite side of the primary side winding of the second transformer T2 respectively with positive power supply VS+ and negative power supply VS-
Connection, the lower half-bridge control terminal of the second half-bridge pwm chip U8 is connected with the grid of the 6th power switch pipe Q8, described
The emitter of 6th power switch pipe Q8 is connected with negative power supply VS-；
The both ends of vice-side winding of the second transformer T2 are connected with two input terminals of the second rectifier bridge, and described second is whole
The positive output end of stream bridge passes sequentially through the 4th inductance L4 and the 4th capacitance C4 is connected with negative output terminal, and negative output terminal is as second
The output terminal of Switching Power Supply.
It elaborates below in conjunction with specific embodiment to the present invention.
Embodiment one
A kind of power amplifier, including class AB power amplification circuit, first switch power supply and second switch power supply, class AB
Power amplification circuit includes the NPN type power tube Q3 of symmetrical complement and positive-negative-positive power tube Q4, the first control of first switch power supply
End is connected with the collector of NPN type power tube Q3, and the second control terminal is connected with the emitter of NPN type power tube Q3, first switch
The output voltage that the output terminal of power supply provides voltage follow NPN type power tube Q3 for class AB power amplification circuit changes just
Power vd+, the first control terminal of second switch power supply is connected with the collector of positive-negative-positive power tube Q4, the second control terminal and positive-negative-positive
The emitter connection of power tube Q4, the output terminal of second switch power supply provide voltage follow PNP for class AB power amplification circuit
The output voltage of type power tube Q4 and the negative supply VD- changed.In the present embodiment, first switch power supply and second switch power supply
Power tube of the input variable from class AB power amplification circuit output voltage, so as to the variable positive electricity of output voltage respectively
Source VD+ or negative supply VD- controls class AB as the positive supply VD+ of class AB power amplification circuit and negative supply VD-
Voltage between collector-emitter of the power tube of power amplification circuit maintains stable and low value state.First switch
Power supply and second switch power supply can be various forms of switching power supplies or module, and class AB power is followed as long as can realize
The output voltage of the power tube of amplifying circuit and adjust the output voltage of Switching Power Supply.In order to by this power amplifier with it is existing
The power amplifiers such as class a audio power amplifier, Class B power amplifier, class AB power amplifier, class D power amplifier distinguish, this power amplifier is defined as M class work(
It puts.
In the present invention, power tube can also use field-effect tube equivalent substitution, as long as by the grid of field-effect tube, source electrode and
Drain electrode corresponds to base stage, the emitter and collector of power tube respectively, and makes it suitable according to prior art adjustment peripheral circuit
Answer the characteristic of field-effect tube.
Embodiment two
The present embodiment is a specific implementation circuit of the M class power amplifiers of embodiment one, and with reference to Fig. 1, in the present embodiment, first opens
Powered-down source includes the first photo-coupler U2, the first pwm chip U1, the first power switch pipe Q1, the first inductance L1, the first electricity
Hold C1, the first diode D1, the first zener diode Z1 and first resistor R1, the input terminal diode of the first photo-coupler U2
Anode is connected with the anode of the first zener diode Z1, as the after the cathode of the first zener diode Z1 connection first resistor R1
First control terminal of one Switching Power Supply, the cathode of the input terminal diode of the first photo-coupler U2 as first switch power supply
Two control terminals；
The collector of the output terminal triode of first photo-coupler U2 is connected with the control terminal of the first pwm chip U1,
The output terminal of first pwm chip U1 is connected with the grid of the first power switch pipe Q1, the drain electrode of the first power switch pipe Q1
It being connected with positive power supply VS+, the one end of source electrode respectively with the cathode of the first diode D1 and the first inductance L1 is connected, and the one or two
The anode of pole pipe D1 is connected with one end of the first capacitance C1 and connecting node is connected with negative power supply VS-, the first capacitance C1's
The other end is connected with the other end of the first inductance L1 and output terminal of the connecting node as first switch power supply.
Second switch power supply includes the second photo-coupler U4, the second pwm chip U3, the second power switch pipe Q2, the
Two inductance L2, the second capacitance C2, the second diode D2, the second zener diode Z2 and second resistance R2, the second photo-coupler U4
The anode of input terminal diode be connected with the anode of the second zener diode Z2, the cathode connection of the second zener diode Z2 the
The second control terminal after two resistance R2 as second switch power supply, the cathode conduct of the input terminal diode of the second photo-coupler U4
First control terminal of second switch power supply；
The collector of the output terminal triode of second photo-coupler U4 is connected with the control terminal of the second pwm chip U3,
The output terminal of second pwm chip U3 is connected with the grid of the second power switch pipe Q2, the source electrode of the second power switch pipe Q2
It being connected with negative power supply VS+, the one end respectively with the anode of the second diode D2 and the second inductance L2 that drains is connected, and the two or two
The cathode of pole pipe D2 is connected with one end of the second capacitance C2 and connecting node is connected with positive power supply VS+, the second capacitance C2's
The other end is connected with the other end of the second inductance L2 and output terminal of the connecting node as second switch power supply.
The class AB power amplification circuit of the present embodiment is except the NPN type power tube Q3 of symmetrical complement and positive-negative-positive power tube
Outside Q4, the 3rd diode D3, the 4th diode D4,3rd resistor R3 and the 4th resistance R4 are further included, the 3rd diode D3 is just
Pole is connected with the base stage of NPN type power tube Q3, and cathode is connected with the anode of the 4th diode D4 and is followed by input signal, the four or two pole
The cathode of pipe D4 is connected with the base stage of positive-negative-positive power tube Q4, and the collector of NPN type power tube Q3 is connected VD+ with positive supply, and the 3rd
One end of resistance R3 is connected with the emitter of NPN type power tube Q3, and the other end is used as first after being connected with one end of the 4th resistance R4
The signal output part of class B power amplifying circuit, the other end of the 4th resistance R4 are connected with the emitter of positive-negative-positive power tube Q4,
The collector of positive-negative-positive power tube Q4 is connected with negative supply VD-.NPN type power tube Q3 and positive-negative-positive power tube Q4 in order to prevent
Intermodulation distortion, the one end for further including the 5th resistance R5 and the 6th resistance R6, R5 is connected with the base stage of NPN type power tube Q3, another
End is connected with positive supply VD+, and one end of R6 is connected with the base stage of positive-negative-positive power tube Q4, and the other end is connected with negative supply VD-.
In the present embodiment, input signal is input to class AB power amplification circuit at " IN ", by by power tube Q3, Q4
The emitter follower of composition, output terminal " OUT " is with regard to that can drive the load of bigger.In figure, R3, R4, R5, R6, D3, D4, Q3, Q4 structure
Into a class AB power amplification circuit, from " IN " input signal, class AB power amplification circuit puts input signal no-voltage
Greatly, but there is Current amplifier, amplified signal is exported from " OUT ".By selecting suitable D3 and D4 so that R3, R4 are in no letter
Number when still have a constant current, ensure that Q3, Q4 have fundamental current near no-voltage, to prevent intermodulation distortion.In use, positive power supply
Power supply VS+, negative power supply VS- are DC power supply, and voltage is metastable（Compared with reference ground GND）If VS+ and
The direct short circuits of VD+, VS- and VD- also direct short circuit, then the class AB power amplification circuit in Fig. 1 be exactly that one common and allusion quotation
The class AB electronic circuit of type, it will possess higher fidelity but possesses relatively low efficiency simultaneously.In this patent, positive supply VD+, negative electricity
The voltage of source VD-（Compared with GND）To be with condition variation.First switch power supply and second switch power supply are one respectively
The Switching Power Supply of the voltage-dropping type of voltage variable, Q1, Q2 are switching tube, and D1, D2 are fly-wheel diode, and L1, L2 are energy storage inductor,
C1, C2 are filter capacitor（In order to ensure quick changes in voltage, the capacity of two capacitance is little）.First with first switch power supply for
It is bright, collection power generation pressure of the input variable from rear class NPN type power tube Q3 of first switch power supply（I.e. between collector-emitter
Voltage）, when the collection power generation pressure of Q3 is increased to a threshold values Vt（Vt values can be obtained by the selection of R1, Z1 parameter), the electricity
Pressure turns on LED by the LED sides of R1, Z1, arrival optocoupler U2.During the LED conductings of U2, the control terminal SEN level of U1 is drawn
Low, the pulse of the PWM feet output of U1 will weaken（Here the U1 used is the pwm chip of a not specified model, and its SEN
There is pull-up resistor in inside, and assumes that control mode is to export the pulsewidth of PWM when SEN low levels to weaken, when SEN high level,
Exporting the pulsewidth of PWM will strengthen）, the voltage on capacitance C1 will reduce, and the collector voltage of Q3 will reduce, and collection power generation pressure also drops
It is low.On the contrary, if the power generation that collects of Q3 is forced down in Vt, by feedback control, the voltage on C1 will raise.The collection power generation of so Q3
Pressure is stable in Vt values.Similarly, by the control of second switch power supply, the collection power generation pressure of Q4 is also stable in Vt values.Pass through
Judge whether power tube collection power generation pressure is more than setting value and consequential signal is sent to Switching Power Supply control terminal progress feedback control
Mode, limit the present embodiment employed in optocoupler form, any technology of the prior art, the application may be employed
In repeat no more.
The variation and adjustment of two switch power source output voltages are exactly in order to which the collection of the power tube pressure that generates electricity is kept to stablize relatively
And low value, the selection principle of low value are：The value can guarantee power tube be in amplification region and non-saturated region.When power tube works in
During amplification region, when collection power generation pressure is lower, the efficiency of power tube is higher, higher so as to the efficiency of class AB power amplification circuit, because
This, by the feedback control of the output voltage of two Switching Power Supplies, ensure that the high efficiency of class AB power amplification circuit.In order to
Comparison, Fig. 2 illustrate the oscillogram that the output voltage of a traditional typical class AB power amplifier changes over time, exactly scheme
VS+ and VD+ short circuits, the situation of VS- and VD- short circuits are assumed in 1.When input voltage IN changes, output voltage is with covariant
Change, Vout is output voltage, and peak values of ac is close to supply voltage VS+ and VS-.Vce represents the collection power generation pressure of Q3 in figure, it determines
Determine consumption power.
Fig. 3 illustrates the changing rule situation using the output voltage waveforms of the power amplifier under the case for this embodiment,
When output voltage Vout changes, collector voltage VD+, VD- of Q3, Q4 will also follow variation, they distinguish with output signal
Remain metastable dipolar positive and negative pressure.Vce represents the positive polarity pressure difference of Q3 and signal in figure, it decides the pipe
Power consumption.Q4's is also similar, does not repeat.Obviously, compared with Fig. 2, this Vce is much smaller.Therefore the efficiency of this power amplifier
Higher than traditional class AB power amplifier in Fig. 2 is more.
With class D（That is D classes）The noise principle of power amplifier is the same, and the supply voltage switch of switching regulator work equally has centainly
Fluctuation or noise, but with the difference for being directly output to load of class D, this fluctuation is the collector that is added on power tube
On, it can't be transferred to emitter up, this is that the principle of emitter follower is determined namely the output of emitter-base bandgap grading is only with base stage
Correlation, it is almost uncorrelated with collector.Therefore, its fidelity will be guaranteed, it also achieves high efficiency, therefore this in addition
Power amplifier can realize high fidelity and high efficiency simultaneously.
In the present invention, power tube can also use field-effect tube equivalent substitution, as long as by the grid of field-effect tube, source electrode and
Drain electrode corresponds to base stage, the emitter and collector of power tube respectively, and makes it suitable according to prior art adjustment peripheral circuit
Answer the characteristic of field-effect tube.
Embodiment three
The present embodiment is another specific implementation circuit of the M class power amplifiers of embodiment one, reference Fig. 4, in the present embodiment, first
Switching Power Supply includes the 3rd photo-coupler U5, the first half-bridge pwm chip U7, the 3rd power switch pipe Q5, the 4th power and opens
It is whole to close pipe Q6, the first transformer T1, the 3rd inductance L3, the 3rd capacitance C3, the 3rd zener diode Z3, the 7th resistance R7 and first
Bridge is flowed, the anode of the input terminal diode of the 3rd photo-coupler U5 is connected with the anode of the 3rd zener diode Z3, the 3rd voltage stabilizing
The first control terminal after the 7th resistance R7 of cathode connection of diode Z3 as first switch power supply, the 3rd photo-coupler U5's is defeated
Enter to hold the cathode of diode as the second control terminal of first switch power supply；The compositions such as R7, Z3, U5, U7, Q5, Q6, T1, L3, C3
One adjustable switching power circuit of voltage, the input terminal of the 3rd photo-coupler U5 adjust the voltage of C3, and the input terminal of U5 comes
Voltage between the collector and emitter of Q3, makes it keep relative stability.It is assuming that electric between the collector and emitter of Q3
It presses as Vce, the supply voltage of the collector of output signal voltage Vout, Q3 is VD+, then the relation between them is：VD+
=Vout+Vce, since Vce is constant, so VD+ constant proportion Vout high, and change as Vout changes, such as Fig. 5 institutes
Show；
In Fig. 4, the HP ports of the first half-bridge pwm chip U7 and the second half-bridge pwm chip U8 represent upper half bridge
Control terminal, BG ports represent bridge contact, and LP ports represent lower half bridge control terminal；The output terminal triode of 3rd photo-coupler U5
Collector is connected with the input terminal of the first half-bridge pwm chip U7, the upper half-bridge control terminal of the first half-bridge pwm chip U7
It is connected with the grid of the 3rd power switch pipe Q5, the collector of the 3rd power switch pipe Q5 is connected with positive power supply VS+, source electrode
Be connected respectively with the collector of the bridge contact of the first half-bridge pwm chip U7 and the 4th power switch pipe Q6 and connecting node with
The one side connection of the primary side winding of first transformer T1, the opposite side of the primary side winding of the first transformer T1 are electric with positive power supply respectively
Source VS+ is connected with negative power supply VS-, lower half-bridge control terminal and the 4th power switch pipe of the first half-bridge pwm chip U7
The grid connection of Q6, the emitter of the 4th power switch pipe Q6 are connected with negative power supply VS-；
The both ends of the vice-side winding of first transformer T1 are connected with two input terminals of the first rectifier bridge, and the first rectifier bridge is just
Output terminal is connected with one end of the 3rd inductance L3, and negative output terminal is connected with one end of the 3rd capacitance C3, and the 3rd inductance L3's is another
End is connected with the other end of the 3rd capacitance C3 and output terminal of the connecting node as first switch power supply.
Preferred embodiment is further used as, second switch power supply is controlled including the 4th photo-coupler U6, the second half-bridge PWM
Coremaking piece U8, the 5th power switch pipe Q7, the 6th power switch pipe Q8, the second transformer T2, the 4th inductance L4, the 4th capacitance
C4, the 4th zener diode Z4, the 8th resistance R8 and the second rectifier bridge, the anode of the input terminal diode of the 4th photo-coupler U6
It is connected with the anode of the 4th zener diode Z4, is opened after the 8th resistance R8 of cathode connection of the 4th zener diode Z4 as second
Second control terminal in powered-down source, the cathode of the input terminal diode of the 4th photo-coupler U6 are controlled as the first of second switch power supply
End processed；
The input terminal of the collector of the output terminal triode of 4th photo-coupler U6 and the second half-bridge pwm chip U8 connect
It connects, the upper half-bridge control terminal of the second half-bridge pwm chip U8 is connected with the grid of the 5th power switch pipe Q7, and the 5th power is opened
The collector for closing pipe Q7 is connected with positive power supply VS+, source electrode respectively with the bridge contact of the second half-bridge pwm chip U8 and the
The collector of six power switch pipe Q8 connects and connecting node is connected with the one side of the primary side winding of the second transformer T2, and second becomes
The opposite side of the primary side winding of depressor T2 is connected respectively with positive power supply VS+ and negative power supply VS-, the second half-bridge PWM controls
The lower half-bridge control terminal of coremaking piece U8 is connected with the grid of the 6th power switch pipe Q8, the emitter of the 6th power switch pipe Q8 with
Negative power supply VS- connections；In Fig. 4, two derided capacitors are in series between positive power supply VS+ and negative power supply VS-, the
The opposite side of the primary side winding of two transformer T2 is connected with derided capacitors midpoint；
The both ends of the vice-side winding of second transformer T2 are connected with two input terminals of the second rectifier bridge, and the second rectifier bridge is just
Output terminal passes sequentially through the 4th inductance L4 and the 4th capacitance C4 is connected with negative output terminal, and negative output terminal is as second switch power supply
Output terminal, and negative output terminal of the connecting node between the 4th inductance L4 and the 4th capacitance C4 also with the first rectifier bridge is connected.
As shown in Figure 4, the class AB power amplification circuit of the present embodiment except symmetrical complement NPN type power tube Q3 and
Outside positive-negative-positive power tube Q4, the 3rd diode D3, the 4th diode D4,3rd resistor R3 and the 4th resistance R4 are further included, the three or two
The anode of pole pipe D3 is connected with the base stage of NPN type power tube Q3, and cathode is connected with the anode of the 4th diode D4 is followed by input letter
Number, the cathode of the 4th diode D4 is connected with the base stage of positive-negative-positive power tube Q4, the collector and positive supply of NPN type power tube Q3
VD+ is connected, one end of 3rd resistor R3 is connected with the emitter of NPN type power tube Q3, one end of the other end and the 4th resistance R4
Signal output part after connection as class AB power amplification circuit, the other end of the 4th resistance R4 is with positive-negative-positive power tube Q4's
Emitter connects, and the collector of positive-negative-positive power tube Q4 is connected with negative supply VD-.
Preferably, in the present embodiment, the cathode after being amplified to input signal again with the 3rd diode D3 is connected, specifically
, class AB power amplification circuit further includes operational amplifier U, the 9th resistance R9 and the tenth resistance R10, operational amplifier U's
Homophase input terminates input signal, and output terminal is connected with the cathode of the 3rd diode D3, and one end of the tenth resistance R10 is put with computing
The inverting input connection of big device U, the other end are connected with signal output part, and the inverting input of operational amplifier U passes through the 9th
Resistance R9 is grounded.In the present embodiment, U, R9, R10, R11, R12, R3, R4, Q3, Q4 form a class AB power amplification circuit,
Signal is inputted from " IN ", and " OUT " output, the class AB power amplification circuit of the present embodiment can be to the voltage and electricity of input signal
Stream is all amplified.In Fig. 4, VCC3 and VSS3 are stable power supply.
In the circuit of Fig. 4, the primary side winding of the first transformer T1 and the second transformer T2 are connected to the power frequency filter of series connection respectively
At the concatenation point of ripple capacitance and at the bridge contact of half-bridge power pipe, as shown in Figure 4, wherein C11, C12, C13, C14 are filters
Ripple capacitance.Resistance R11, R12 are upper pull down resistor, and electric current is provided to power tube Q3 and Q4, because D3, D4 exist, operation amplifier
Device U cannot provide electric current for power tube Q3 and Q4, therefore, be carried by setting for power tube Q3 and Q4 after resistance R11, R12
For electric current.D3, D4 are in order to which R3, R4 is made still to have a constant pressure drop in signal zero-crossing, that is, still have a constant current, prevent from handing over
More distortion.Assuming that D3, D4 have had ensured that base stage of the conduction voltage drop more than single triode Q3, Q4 of single diode is sent out when choosing
Emitter voltage drop.
In Fig. 4, input signal is input to class AB power amplification circuit at " IN ", by being made of power tube Q3, Q4
Emitter follower, output terminal " OUT " is with regard to that can drive the load of bigger.In the present embodiment, class AB power amplification circuit is put
Big multiple is determined by the ratio of R10 and R9.Operational amplifier U and power tube Q3, Q4 form to form profound and negative feedbck structure, fidelity
Degree is high.The present embodiment has used mains-supplied, and left side is rectification circuit in figure, and first switch power supply and second switch are given after rectification
Power supply is powered, and by rectifier bridge by behind commercial power rectification, the positive output end of rectifier bridge provides positive power supply for two Switching Power Supplies,
Negative output terminal provides negative power supply for two Switching Power Supplies, and U7, U8 are the half-bridge pwm chips of half-bridge driven, PWM's
Output width is directly proportional to input control foot SEN level namely SEN level is lower, and PWM outputs are smaller, and vice versa.Due to
What SEN level was kept a close watch on is the collector and emitter of power tube Q3, so the collection power generation pressure of Q3 is kept relative constant.Work as PWM
Output voltage variation when, the collector voltage of Q3（Compared with reference to ground voltage）Also and then following in sb's footsteps, ground is synchronous to be changed.Q4
Situation it is also similar.Using the changing rule situation of the power tube voltage waveform under the case for this embodiment as shown in figure 5, in figure
Vce1 be Q3 collection hair pressure drop, Vce2 be Q4 collection hair pressure drop.In the present embodiment, due to the relation of circuit structure, VD+ will not
There is negative polarity（For ground potential GND）, positive polarity will not occur in similary VD-.This is somewhat different with Fig. 3, but
This can't substantially weaken original high efficiency, such as when in Fig. 5, Vce2 values occur from output as positive polarity when bigger
Moment, and positive polarity driving moment Q3 is only main force electric current provider, the electric current of Q4 is simultaneously little, and simply some maintenances are prevented from handing over and got over
The fundamental current of distortion, it is also possible to as load current increases, the pressure drop of Q3 emitter resistances R3 also increases, and due to
The voltage difference of Q3, Q4 base stage is relative constant, therefore the voltage of Q4 emitter resistances R4 will reduce, and Q4 electric currents can be reduced to zero,
So the power consumption of Q4 and little.Similarly, during negative polarity exports, even if the collection hair pressure drop of Q3 may be big, but at this time
Q4 is only main force electric current supplier, so the weak current of Q3 will not equally form big power consumption.The present embodiment compared with embodiment two,
Although efficiency is smaller, benefit is that capacitive coupling can be not required in output, and load is directly accessed in OUT and GND both ends,
Low frequency characteristic is good.These circuits are well suited for being applied on sound equipment driving circuit, and even voltage can in adjustable ac source equipment
Good low-heat and low noise sound effective value can be also obtained on the direct current linear power supply of tune.
Identical with embodiment two, the variation and adjustment of two switch power source output voltages are exactly to keep the collection of power tube
Voltage between electrode-transmitter pole（That is collection power generation pressure）Stablize relatively and low value, the selection principle of low value are：The value can guarantee
Power tube is in amplification region and non-saturated region.When power tube works in amplification region, when collection power generation pressure is lower, the efficiency of power tube
It is higher, it is higher so as to the efficiency of class AB power amplification circuit, therefore, pass through the feedback control of the output voltage of two Switching Power Supplies
System, ensure that the high efficiency of class AB power amplification circuit.In the present invention, power tube can also be replaced using field-effect tube is equivalent
Generation, if the grid of field-effect tube, source electrode and drain electrode are corresponded to base stage, the emitter and collector of power tube respectively, and
The characteristic of field-effect tube is adapted it to according to prior art adjustment peripheral circuit.
The above are implementing to be illustrated to the preferable of the present invention, but the invention is not limited to embodiment, ripe
A variety of equivalent variations or replacement can also be made on the premise of without prejudice to spirit of the invention by knowing those skilled in the art, these
Equivalent modification or replacement is all contained in the application claim limited range.
Claims (5)
1. power amplifier, which is characterized in that including class AB power amplification circuit, first switch power supply and second switch power supply,
The class AB power amplification circuit includes the NPN type power tube of symmetrical complement and positive-negative-positive power tube, the first switch power supply
The first control terminal be connected with the collector of NPN type power tube, the second control terminal is connected with the emitter of NPN type power tube, institute
State the output terminal of first switch power supply for class AB power amplification circuit provide voltage follow NPN type power tube output voltage and
The positive supply of variation, the first control terminal of the second switch power supply are connected with the collector of positive-negative-positive power tube, the second control terminal
It is connected with the emitter of positive-negative-positive power tube, the output terminal of the second switch power supply provides electricity for class AB power amplification circuit
The negative supply that pressure follows the output voltage of positive-negative-positive power tube and changes；
The first switch power supply include the first photo-coupler, the first pwm chip, the first power switch pipe, the first inductance,
First capacitance, the first diode, the first zener diode and first resistor, the input terminal diode of first photo-coupler
Anode is connected with the anode of the first zener diode, and first is used as after the cathode connection first resistor of first zener diode
First control terminal of Switching Power Supply, the cathode of the input terminal diode of first photo-coupler as first switch power supply
Two control terminals；
The collector of the output terminal triode of first photo-coupler is connected with the control terminal of the first pwm chip, described
The output terminal of first pwm chip is connected with the grid of the first power switch pipe, the drain electrode of first power switch pipe with
Positive power supply connection, the one end of source electrode respectively with the cathode of the first diode and the first inductance are connected, first diode
Anode be connected with one end of the first capacitance and connecting node is connected with negative power supply, the other end of first capacitance and
The other end connection of one inductance and output terminal of the connecting node as first switch power supply；
The second switch power supply include the second photo-coupler, the second pwm chip, the second power switch pipe, the second inductance,
Second capacitance, the second diode, the second zener diode and second resistance, the input terminal diode of second photo-coupler
Anode is connected with the anode of the second zener diode, and second is used as after the cathode connection second resistance of second zener diode
Second control terminal of Switching Power Supply, the cathode of the input terminal diode of second photo-coupler as second switch power supply
One control terminal；
The collector of the output terminal triode of second photo-coupler is connected with the control terminal of the second pwm chip, described
The output terminal of second pwm chip is connected with the grid of the second power switch pipe, the source electrode of second power switch pipe with
Negative power supply connection, the one end respectively with the anode of the second diode and the second inductance that drains are connected, second diode
Cathode be connected with one end of the second capacitance and connecting node is connected with positive power supply, the other end of second capacitance and
The other end connection of two inductance and output terminal of the connecting node as second switch power supply.
2. power amplifier according to claim 1, which is characterized in that the class AB power amplification circuit further includes the 3rd
Diode, the 4th diode, 3rd resistor and the 4th resistance, the anode of the 3rd diode and the base stage of NPN type power tube
Connection, cathode are connected with the anode of the 4th diode and are followed by input signal, cathode and the positive-negative-positive power tube of the 4th diode
Base stage connection, the collector of the NPN type power tube is connected with positive supply, one end of the 3rd resistor and NPN type power
The emitter connection of pipe, signal output as class AB power amplification circuit after the other end is connected with one end of the 4th resistance
End, the other end of the 4th resistance are connected with the emitter of positive-negative-positive power tube, and the collector of the positive-negative-positive power tube is with bearing
Power supply connects.
3. power amplifier, which is characterized in that including class AB power amplification circuit, first switch power supply and second switch power supply,
The class AB power amplification circuit includes the NPN type power tube of symmetrical complement and positive-negative-positive power tube, the first switch power supply
The first control terminal be connected with the collector of NPN type power tube, the second control terminal is connected with the emitter of NPN type power tube, institute
State the output terminal of first switch power supply for class AB power amplification circuit provide voltage follow NPN type power tube output voltage and
The positive supply of variation, the first control terminal of the second switch power supply are connected with the collector of positive-negative-positive power tube, the second control terminal
It is connected with the emitter of positive-negative-positive power tube, the output terminal of the second switch power supply provides electricity for class AB power amplification circuit
The negative supply that pressure follows the output voltage of positive-negative-positive power tube and changes；
The first switch power supply includes the 3rd photo-coupler, the first half-bridge pwm chip, the 3rd power switch pipe, the 4th
Power switch pipe, the first transformer, the 3rd inductance, the 3rd capacitance, the 3rd zener diode, the 7th resistance and the first rectifier bridge,
The anode of the input terminal diode of 3rd photo-coupler is connected with the anode of the 3rd zener diode, the 3rd voltage stabilizing two
The first control terminal after cathode the 7th resistance of connection of pole pipe as first switch power supply, the input terminal of the 3rd photo-coupler
Second control terminal of the cathode of diode as first switch power supply；
The collector of the output terminal triode of 3rd photo-coupler is connected with the control terminal of the first half-bridge pwm chip,
The upper half-bridge control terminal of the first half-bridge pwm chip is connected with the grid of the 3rd power switch pipe, the 3rd power
The drain electrode of switching tube is connected with positive power supply, the source electrode bridge contact and the 4th power with the first half-bridge pwm chip respectively
The drain electrode of switching tube connects and connecting node is connected with the one side of the primary side winding of the first transformer, the original of first transformer
The opposite side of side winding is connected respectively with positive power supply and negative power supply, the lower half of the first half-bridge pwm chip
Bridge control terminal is connected with the grid of the 4th power switch pipe, and the source electrode of the 4th power switch pipe is connected with negative power supply；
The both ends of the vice-side winding of first transformer are connected with two input terminals of the first rectifier bridge, first rectifier bridge
Positive output end is connected with one end of the 3rd inductance, and negative output terminal is connected with one end of the 3rd capacitance, the 3rd inductance it is another
End is connected with the other end of the 3rd capacitance and output terminal of the connecting node as first switch power supply；
The second switch power supply includes the 4th photo-coupler, the second half-bridge pwm chip, the 5th power switch pipe, the 6th
Power switch pipe, the second transformer, the 4th inductance, the 4th capacitance, the 4th zener diode, the 8th resistance and the second rectifier bridge,
The anode of the input terminal diode of 4th photo-coupler is connected with the anode of the 4th zener diode, the 4th voltage stabilizing two
The second control terminal after cathode the 8th resistance of connection of pole pipe as second switch power supply, the input terminal of the 4th photo-coupler
First control terminal of the cathode of diode as second switch power supply；
The collector of the output terminal triode of 4th photo-coupler is connected with the control terminal of the second half-bridge pwm chip,
The upper half-bridge control terminal of the second half-bridge pwm chip is connected with the grid of the 5th power switch pipe, the 5th power
The drain electrode of switching tube is connected with positive power supply, the source electrode bridge contact and the 6th power with the second half-bridge pwm chip respectively
The drain electrode of switching tube connects and connecting node is connected with the one side of the primary side winding of the second transformer, the original of second transformer
The opposite side of side winding is connected respectively with positive power supply and negative power supply, the lower half of the second half-bridge pwm chip
Bridge control terminal is connected with the grid of the 6th power switch pipe, and the source electrode of the 6th power switch pipe is connected with negative power supply；
The both ends of the vice-side winding of second transformer are connected with two input terminals of the second rectifier bridge, second rectifier bridge
Positive output end passes sequentially through the 4th inductance and the 4th capacitance is connected with negative output terminal, and negative output terminal is as second switch power supply
Output terminal.
4. power amplifier according to claim 3, which is characterized in that the class AB power amplification circuit further includes the 3rd
Diode, the 4th diode, 3rd resistor and the 4th resistance, the anode of the 3rd diode and the base stage of NPN type power tube
Connection, cathode are connected with the anode of the 4th diode and are followed by input signal, cathode and the positive-negative-positive power tube of the 4th diode
Base stage connection, the collector of the NPN type power tube is connected with positive supply, one end of the 3rd resistor and NPN type power
The emitter connection of pipe, signal output as class AB power amplification circuit after the other end is connected with one end of the 4th resistance
End, the other end of the 4th resistance are connected with the emitter of positive-negative-positive power tube, and the collector of the positive-negative-positive power tube is with bearing
Power supply connects.
5. power amplifier according to claim 4, which is characterized in that the class AB power amplification circuit further includes computing
Amplifier, the 9th resistance and the tenth resistance, the homophase input termination input signal of the operational amplifier, output terminal and the three or two
The cathode connection of pole pipe, one end of the tenth resistance and the inverting input of operational amplifier connect, and the other end is defeated with signal
Outlet connects, and the inverting input of the operational amplifier passes through the 9th resistance eutral grounding.
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| CN110234049B (en) * | 2018-03-05 | 2021-09-24 | 重庆川水渔农智能科技有限公司 | Driving circuit |
| CN108448921A (en) * | 2018-03-07 | 2018-08-24 | 上海广为美线电源电器有限公司 | DC-AC inverse changing driving circuits |
| CN110109498A (en) * | 2019-05-16 | 2019-08-09 | 武汉大学 | A kind of device and method of linear AC voltage adjusting and voltage filter |
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| JPH05102745A (en) * | 1991-10-07 | 1993-04-23 | Mesutetsuku:Kk | High output amplifier circuit |
| CN2435878Y (en) * | 2000-03-23 | 2001-06-20 | 王世祥 | Single-class power amplifier |
| CN2549651Y (en) * | 2002-03-29 | 2003-05-07 | 深圳市中兴通讯股份有限公司上海第二研究所 | Class A and B linear power amplifiers with large dynamic ranges |
| CN1551487A (en) * | 2003-05-12 | 2004-12-01 | 日本胜利株式会社 | Power amplifier circuit |
| CN101753110A (en) * | 2008-11-27 | 2010-06-23 | 雅马哈株式会社 | Amplifier |
| CN102931943A (en) * | 2012-11-06 | 2013-02-13 | 长沙景嘉微电子股份有限公司 | Second-order active resistor-capacitor (RC) low-pass filter circuit with Class-AB amplifier output |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105743444A (en) | 2016-07-06 |
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