CN104767492B - Three level power amplifiers and hysteresis control method thereof - Google Patents
Three level power amplifiers and hysteresis control method thereof Download PDFInfo
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Abstract
The present invention relates to a kind of three level power amplifiers and hysteresis control method thereof, including hysteresis comparison control circuit, bridge circuit and the drive circuit being located between hysteresis comparison control circuit and bridge circuit, Hysteresis control circuit is formed by operational amplifier and comparator, load current is detected by current transformer to obtain magnitude of voltage ui；Voltage follower exports u1 to given value of current signal detection, compared with magnitude of voltage ui exports u1 by comparator COMP1 with voltage follower, obtains FET Q1 drive signals；Compared with operational amplifier OP2 and OP3 realize that given value of current signal proportion exports u2, magnitude of voltage ui and u2 by comparator COMP2, FET Q2 drive signals are obtained；Comparator COMP1 and COMP2 output generate FET Q1 and Q2 driving control signal after amplifying by drive circuit, by controlling Q1 and Q2 to turn on and off, realize power amplifier Hysteresis control, with simple efficient, fast response time, efficiency high, EMI disturb the characteristics of small.
Description
Technical field
The present invention relates to a kind of three level power amplifiers and control method, more particularly to one kind to improve the response time
With three level power amplifiers of response speed and can simply efficiently, reduce and be lost and improve three level of circuit whole efficiency
Power amplifier and hysteresis control method thereof.
Background technology
With the development of power electronic devices and control technology, realize that power amplification is mesh using modern power electronics technology
It is preceding through frequently with mode, the key element conventional as various power supplys and instrument and equipment, usually require that with faster dynamic
Response speed, less volume and then requires higher energy efficiency, while EMI interference is small, prevents from making the product of surrounding
Into interference.Hysteresis control be by comparing tracing control, as it is a kind of it is non-linear bang-bang control method, in all kinds of Closed loop tracks
Extensive use in control system.And existing three level powers amplifier response speed is slow, quick response requirement can not be met, together
When its control method it is complicated, efficiency is low.
The content of the invention
One kind is provided by using Hysteresis control side it is an object of the invention to overcome the deficiencies in the prior art
Method, the response time no more than 1ms is realized, greatly improve the response speeds of three level power amplifiers, while by using
COOLMOS and silicon carbide diode, reduce loss and improve the three level power amplifiers and Hysteresis control of circuit whole efficiency
Method.
The object of the present invention is achieved like this：
A kind of three level power amplifiers, including hysteresis comparison control circuit, bridge circuit and be arranged on stagnant ring and compare control
Drive circuit between circuit and bridge circuit processed, wherein by 3 operational amplifiers OP1, OP2, OP3 and 2 comparators
COMP1, COMP2 form Hysteresis control circuit, by FET Q1, FET Q2, silicon carbide diode D1, the pole of carborundum two
Pipe D2 forms bridge circuit, and drive circuit DRV1, DRV2 are connected between hysteresis comparison control circuit and bridge circuit, its feature
It is:
FET Q1, silicon carbide diode D2 and silicon carbide diode D1, FET Q2 respectively constitute bridge circuit
Two bridge arms, the midpoints of two bridge arms is connected to using inductance L summation current transformers TA, while the bridge arm of bridge circuit is upper
End connection 300V voltage sources VIN；
Resistance, in-phase input end connection resistance, two electricity are connected between operational amplifier OP1 inverting inputs and output end
Resistance forms voltage follower, comparator COMP1 positive input terminal concatenation operation amplifiers OP1 outputs together with operational amplifier OP1
End, the reference signal given for receiving operational amplifier OP1, comparator COMP1 negative input ends connection current transformer TA, connect
The current signal from current transformer TA feedbacks is received, comparator COMP1 output ends are connected after drive circuit DRV1 amplifications and shown up
Effect pipe Q1 grid；
Two resistance of parallel connection, anti-phase input are connected between operational amplifier OP2 inverting inputs and current reference signal
End connects resistance with output end, and resistance is connected between operational amplifier OP3 inverting inputs and operational amplifier OP2 output ends,
Resistance, operational amplifier OP2 and OP3 composition FET Q2 given, comparator are connected between inverting input and output end
COMP2 positive input terminal concatenation operation amplifier OP3 output ends, the reference signal given for receiving operational amplifier OP3, compare
Device COMP2 negative input ends connect current transformer TA, receive current transformer TA feedback signal, comparator COMP2 output ends
FET Q2 grid is connected to after drive circuit DRV2 amplifications;
When the current signal of the output end of voltage follower is more than current feedback signal, FET Q1 is open-minded always,
When current feedback signal is more than given value of current signal, FET Q1 shut-offs；When given value of current signal is more than plus stagnant ring signal
During current feedback signal, FET Q2 is open-minded always, when current feedback signal adds stagnant ring signal, field more than given value of current signal
Effect pipe Q2 is turned off；When FET Q1, FET Q2 are opened, the electric current of inductance coil rises, when FET Q1, field
When effect pipe Q2 is turned off, induction coil current declines, when FET Q1, FET Q2 have open-minded a, shut-off
When, the electric current of inductance coil remains unchanged, and forms a zero state, and whole circuit just forms a tri-level circuit.
FET Q1, FET Q2 model use the COOLMOS-IPW60R041C6 of German Infineon, carborundum
Diode D1, silicon carbide diode D2 model use the IDG40G065C5 of Infineon, are simulated using 10mH inductance L actual
Load.
The model OP27 of the operational amplifier.
The model LM393 of the comparator.
A kind of hysteresis control method thereof based on three described level power amplifiers, it is characterised in that：In accordance with the following steps
Carry out：
Step 1）, load current detected to obtain magnitude of voltage u by current transformer TAi；
Step 2）, voltage follower is to given value of current signal detection output voltage values u1, magnitude of voltage uiWith voltage follower
Output voltage values u1Compared by comparator COMP1, obtain FET Q1 drive signal；Operational amplifier OP2 and OP3 are real
The ratio-metric output voltage value u of existing given value of current signal2, magnitude of voltage uiWith magnitude of voltage u2Compared by comparator COMP2, must shown up
Effect pipe Q2 drive signal；
Step 3）, comparator COMP1 and COMP2 output pass through generation FET Q1 and Q2 after drive circuit amplification
Driving control signal, by controlling turning on and off for FET Q1 and Q2, realize the Hysteresis control of power amplifier.
Compared with prior art, the present invention has following outstanding advantages：
1st, circuit is simple:Any power supply control chip useless, only by 3 operational amplifiers OP1, OP2, OP3 and 2
Comparator COMP1, COMP2 form Hysteresis control circuit,
2nd, circuit fast response time:The present invention realizes the sound no more than 1ms by using hysteresis control method thereof
Between seasonable, the response speed of three level power amplifiers is substantially increased.
From fig. 5, it can be seen that the time less than 1ms, current feedback just track given value of current.When given value of current and electric current
When feedback deviation is big, switching tube is switched on or off always, ensures most fast tracking velocity, when current feedback is given close to electric current
When determining, switching tube PWM work, ensure tracking accuracy.From fig. 9, it can be seen that when given electric current is 400Hz, with
The worst error of track electric current and given electric current is also no more than 10us.From fig. 10 it can be seen that the voltage waveform at the end of inductance coil 2 is
Three level, voltage only changes between 0 and 400V with 0 between -400V, reduces the EMI interference of circuit.
3rd, the COOLMOS of the conducting resistance very little used due to circuit, conduction loss very little, the pole of carborundum two is employed
Pipe, without reverse recovery current, reduces switching loss, so, is integrally improved the efficiency of circuit.By using COOLMOS
And silicon carbide diode, loss is reduced, improves the whole efficiency of circuit.
Therefore the characteristics of present invention has simply efficiently, fast response time, efficiency high, and EMI interference is small.The control of the present invention
Loop is simple and reliable, fast response time, the quick upper given value of current of tracking in 1ms.Conduction loss and switching loss are reduced, is improved
The efficiency of power amplifier.
Brief description of the drawings
Fig. 1 is the circuit principle structure schematic diagram of the present invention.
Fig. 2 is the given value of current oscillogram of the present invention.
Fig. 3 is the current feedback signal figure of the present invention.
Fig. 4 is the given value of current signal and electric current hair feedback signal figure of the present invention.
The current feedback that Fig. 5 is the present invention starts oscillogram of the follow current to timing.
Fig. 6 is the oscillogram when current feedback of the present invention tracks above given value of current.
Fig. 7 is the switching tube Q1 of present invention drive waveforms figure.
Fig. 8 is the switching tube Q2 of present invention drive waveforms figure.
Fig. 9 is the oscillogram of worst error when the feedback current tracking of the present invention gives electric current stable state.
Figure 10 is the voltage oscillogram at the inductance coil both ends of the present invention.
Embodiment
The present invention is described in further detail with specific implementation example below in conjunction with the accompanying drawings：This embodiment is with this hair
Implemented under premised on bright technical scheme, give embodiment and operating process, but protection scope of the present invention is not limited to
Following embodiments.
Operation principle：When given value of current signal is more than current feedback signal, switching tube Q1 is open-minded always, works as electric current
If feedback signal is more than given value of current signal, Q1 shut-offs；When given value of current signal is believed plus stagnant ring signal more than current feedback
Number when, Q2 is open-minded always, if current feedback signal adds stagnant ring signal more than given value of current signal, Q2 shut-off.Q1,Q2
When all opening, the electric current of inductance coil rises, and works as Q1, and when Q2 is turned off, induction coil current declines, and works as Q1, Q2
Have one it is open-minded, when a shut-off, the electric current of inductance coil remains unchanged, and forms a zero state, whole circuit just formed
The circuit of individual three level.Isou refers to given value of current signal in figure.
The circuit waveform of emulation：Fig. 2 is the given waveform of electric current, is a direct current biasing on the sine wave of a 400Hz,
Fig. 3 is the feedback signal of electric current, Fig. 4 be given value of current signal with current feedback signal together with the waveform that compares.Fig. 5 is electric current
Feedback beginning follow current gives the waveform in tracking, and Fig. 6 is the waveform after the upper given value of current of current feedback tracking.Fig. 7 is
Switching tube Q7 drive waveforms, Fig. 8 are switching tube Q8 drive waveforms.Fig. 9 is the maximum of the given electric current of feedback current tracking
The waveform of error.Figure 10 is the voltage waveform at inductance coil both ends.
As shown in figure 1, a kind of three level powers amplifier disclosed by the invention, including hysteresis comparison control circuit, bridge-type
Circuit and the drive circuit being arranged between hysteresis comparison control circuit and bridge circuit, wherein by 3 operational amplifier OP1,
OP2, OP3 and 2 comparator COMP1, COMP2 composition Hysteresis control circuits, by FET Q1, FET Q2, carborundum
Diode D1, silicon carbide diode D2 form bridge circuit, drive circuit DRV1, DRV2 be connected to hysteresis comparison control circuit and
Between bridge circuit,
FET Q1, silicon carbide diode D2 and silicon carbide diode D1, FET Q2 respectively constitute bridge circuit
Two bridge arms, actual loading is simulated using inductance L, and load summation current transformer TA is connected in two bridge arms
Point, i.e., the midpoint of two bridge arms, while the upper end connection of the bridge arm of bridge circuit are connected to using inductance L summation current transformers TA
300V voltage sources VIN；
Resistance, in-phase input end connection resistance, two electricity are connected between operational amplifier OP1 inverting inputs and output end
Resistance forms voltage follower together with operational amplifier OP1, comparator COMP1 positive input terminal concatenation operation amplifier OP1's
Output end, for receiving operational amplifier OP1 as given reference signal, comparator COMP1 negative input end connection electric current
Transformer TA, receives the current signal from current transformer TA feedbacks, and comparator COMP1 output end is put through drive circuit DRV1
FET Q1 grid is connected to after big；
Two resistance of parallel connection, anti-phase input are connected between operational amplifier OP2 inverting inputs and current reference signal
End connects resistance with output end, and resistance is connected between operational amplifier OP3 inverting inputs and operational amplifier OP2 output ends,
Resistance, operational amplifier OP2 and OP3 composition FET Q2 given, comparator are connected between inverting input and output end
COMP2 positive input terminal concatenation operation amplifier OP3 output ends, the reference signal given for receiving operational amplifier OP3, compare
Device COMP2 negative input ends connect current transformer TA, receive current transformer TA feedback signal, comparator COMP2 output ends
FET Q2 grid is connected to after drive circuit DRV2 amplifications.
FET Q1, FET Q2 model use the COOLMOS-IPW60R041C6 of German Infineon, carborundum
Diode D1, silicon carbide diode D2 model use the IDG40G065C5 of Infineon, are simulated using 10mH inductance L actual
Load.The model OP27 of the operational amplifier.The model LM393 of the comparator.
When given value of current signal（The current signal of the output end of voltage follower）When more than current feedback signal, greatly
When current feedback signal, FET Q1 is open-minded always, if current feedback signal is more than given value of current signal, field
Effect pipe Q1 is turned off；When given value of current signal is more than current feedback signal plus stagnant ring signal, FET Q2 is always
It is open-minded, if current feedback signal adds stagnant ring signal more than given value of current signal, FET Q2 shut-offs；FET Q1,
When FET Q2 is opened, the electric current of inductance coil rises, when FET Q1, FET Q2 are turned off
Wait, induction coil current decline, when FET Q1, FET Q2 have one it is open-minded, one shut-off when, inductance coil
Electric current remain unchanged, form a zero state, whole circuit just forms the circuit of three level.
The invention also discloses a kind of hysteresis control method thereof based on three described level power amplifiers, its feature exists
In：Carry out in accordance with the following steps：
Step 1）, load current detected by current transformer to obtain magnitude of voltage ui；
Step 2）, voltage follower to given value of current signal detection export u1, magnitude of voltage uiWith the output u of voltage follower1
Compared by comparator COMP1, obtain Q1 drive signal；Operational amplifier OP2 and OP3 realize the ratio of given value of current signal
Export u2, magnitude of voltage uiWith u2Compared by comparator COMP2, obtain Q2 drive signal；
Step 3）, comparator COMP1 and COMP2 output pass through generation FET Q1 and Q2 after drive circuit amplification
Driving control signal, by controlling turning on and off for Q1 and Q2, realize the Hysteresis control of power amplifier.
Claims (4)
1. a kind of three level power amplifiers, including hysteresis comparison control circuit, bridge circuit and it is arranged on hysteresis comparison control
Drive circuit between circuit and bridge circuit, wherein by 3 operational amplifiers OP1, OP2, OP3 and 2 comparator COMP1,
COMP2 forms hysteresis comparison control circuit, by FET Q1, FET Q2, silicon carbide diode D1, silicon carbide diode
D2 forms bridge circuit, and drive circuit DRV1, DRV2 are connected between hysteresis comparison control circuit and bridge circuit, and its feature exists
In:
FET Q1, silicon carbide diode D2 and silicon carbide diode D1, FET Q2 respectively constitute the two of bridge circuit
Individual bridge arm, the midpoint of two bridge arms is connected to using inductance L summation current transformers TA, while the upper end of the bridge arm of bridge circuit connects
Meet 300V voltage sources VIN；
Connect resistance between operational amplifier OP1 inverting inputs and output end, in-phase input end connection resistance, two resistance with
Operational amplifier OP1 forms voltage follower together, comparator COMP1 positive input terminal concatenation operation amplifier OP1 output ends, uses
In receiving the given reference signals of operational amplifier OP1, comparator COMP1 negative input ends connection current transformer TA, receive from
The current signal of current transformer TA feedbacks, comparator COMP1 output ends are connected to field-effect after drive circuit DRV1 amplifications
Pipe Q1 grid；
Connected between operational amplifier OP2 inverting inputs and current reference signal parallel connection two resistance, inverting input and
Output end connects resistance, and resistance is connected between operational amplifier OP3 inverting inputs and operational amplifier OP2 output ends, anti-phase
Resistance, operational amplifier OP2 and OP3 composition FET Q2 given, comparator COMP2 are connected between input and output end
Positive input terminal concatenation operation amplifier OP3 output ends, the reference signal given for receiving operational amplifier OP3, comparator
COMP2 negative input ends connect current transformer TA, receive current transformer TA feedback signal, comparator COMP2 output ends warp
FET Q2 grid is connected to after drive circuit DRV2 amplifications;
When the current signal of the output end of voltage follower is more than current feedback signal, FET Q1 is open-minded always, works as electricity
Stream feedback signal is more than given value of current signal, FET Q1 shut-offs；When given value of current signal is more than electric current plus stagnant ring signal
During feedback signal, FET Q2 is open-minded always, when current feedback signal adds stagnant ring signal, field-effect more than given value of current signal
Pipe Q2 is turned off；When FET Q1, FET Q2 are opened, the electric current of inductance coil rises, when FET Q1, field-effect
When pipe Q2 is turned off, induction coil current decline, when FET Q1, FET Q2 have one it is open-minded, one shut-off when, electricity
The electric current of sense coil remains unchanged, and forms a zero state, and whole circuit just forms a tri-level circuit；
FET Q1, FET Q2 model use the COOLMOS-IPW60R041C6 of German Infineon, the pole of carborundum two
Pipe D1, silicon carbide diode D2 model use the IDG40G065C5 of Infineon, using 10mH inductance L summation current transformers
TA is connected to the midpoint of two bridge arms.
2. three level powers amplifier as claimed in claim 1, it is characterised in that：The model of the operational amplifier
OP27。
3. three level powers amplifier as claimed in claim 1, it is characterised in that：The model LM393 of the comparator.
A kind of 4. hysteresis control method thereof based on three level powers amplifier as claimed in claim 1, it is characterised in that：According to
What following steps were carried out：
Step 1）, load current detected to obtain magnitude of voltage u by current transformer TAi；
Step 2）, voltage follower is to given value of current signal detection output voltage values u1, magnitude of voltage uiWith the output of voltage follower
Magnitude of voltage u1Compared by comparator COMP1, obtain FET Q1 drive signal；Operational amplifier OP2 and OP3 realize electricity
Flow the ratio-metric output voltage value u of Setting signal2, magnitude of voltage uiWith magnitude of voltage u2Compared by comparator COMP2, obtain field-effect
Pipe Q2 drive signal；
Step 3）, comparator COMP1 and COMP2 the output driving that passes through generation FET Q1 and Q2 after drive circuit amplification
Control signal, by controlling turning on and off for FET Q1 and Q2, realize the Hysteresis control of power amplifier.
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| CN201510049230.1A CN104767492B (en) | 2015-01-31 | 2015-01-31 | Three level power amplifiers and hysteresis control method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101425783A (en) * | 2008-12-18 | 2009-05-06 | 浙江大学 | Three-level double-current hysteresis loop power amplifier |
| CN101515763A (en) * | 2009-03-27 | 2009-08-26 | 南京航空航天大学 | Series-parallel connection output tri-level half-bridge inverter and half period hysteresis control method thereof |
| CN204349924U (en) * | 2015-01-31 | 2015-05-20 | 河南柏特电气设备有限公司 | Three level power amplifier |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130300592A1 (en) * | 2012-05-10 | 2013-11-14 | Kapik Inc. | Device, System and Method For Digital Pulse-Density Modulation |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101425783A (en) * | 2008-12-18 | 2009-05-06 | 浙江大学 | Three-level double-current hysteresis loop power amplifier |
| CN101515763A (en) * | 2009-03-27 | 2009-08-26 | 南京航空航天大学 | Series-parallel connection output tri-level half-bridge inverter and half period hysteresis control method thereof |
| CN204349924U (en) * | 2015-01-31 | 2015-05-20 | 河南柏特电气设备有限公司 | Three level power amplifier |
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Inventor after: He Xiaofeng Inventor after: Qi Zewang Inventor after: Wang Xiaoling Inventor before: He Xiaofeng Inventor before: Guan Zhanwei Inventor before: Wang Xueqiang Inventor before: Qi Zewang Inventor before: Hao Zhanduo |
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Effective date of registration: 20180130 Address after: Xuchang City, Henan province 461000 Yongxing urban and rural integration demonstration area east Anthony Rui energy-saving Industrial Park Comprehensive Building 5 floor Applicant after: Henan Innovation Technology Co. Ltd. Address before: 450000 Henan city of Zhengzhou province Zheng Dong New District Fulu Street No. 16 building 18, 8 layers of orange garden Applicant before: HENAN BAITE ELECTRIC EQUIPMENT CO., LTD. |
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