CN110289796A - Two-phase-three-phase modulations mode switching circuit and equipment - Google Patents
Two-phase-three-phase modulations mode switching circuit and equipment Download PDFInfo
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- CN110289796A CN110289796A CN201910659017.0A CN201910659017A CN110289796A CN 110289796 A CN110289796 A CN 110289796A CN 201910659017 A CN201910659017 A CN 201910659017A CN 110289796 A CN110289796 A CN 110289796A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/50—Vector control arrangements or methods not otherwise provided for in H02P21/00- H02P21/36
Abstract
The invention discloses a kind of two-phase-three-phase modulations mode switching circuit and equipment.The present invention is connect by sample circuit with intelligent power module, is sampled to the electric current of intelligent power module, and current signal is obtained；Operational amplifier circuit is separately connected with comparison circuit, sample circuit and intelligent power module, is amplified voltage signal after current signal is converted to voltage signal, is generated first voltage；Comparison circuit is connect with microcontroller, the first level is exported to microcontroller when first voltage is greater than reference voltage, export second electrical level when less than reference voltage, by make microcontroller according to the first level or second electrical level selection three-phase modulations in a manner of or two-phase modulation system control intelligent power module.Wherein, it according to payload size intelligence switch modulation mode, is using three-phase modulations to improve signal-to-noise ratio at light load, is solving the problems, such as that fault misdescription occurs in two-phase modulation at light load, it is using two-phase modulation to reduce fever when overloaded, is solving the problems, such as that three-phase modulations calorific value is excessively high when overloaded.
Description
Technical field
The present invention relates to motor control technology field more particularly to a kind of two-phase-three-phase modulations mode switching circuit and set
It is standby.
Background technique
The driving of blower or compressor assembly generallys use the modulation scheme based on space voltage vector, common space electricity
Pressing Vector Modulation scheme is two-phase modulation scheme or three-phase modulations scheme.
In two-phase modulation system, each switch periods have an IGBT (Insulated Gate Bipolar
Transistor, insulated gate bipolar transistor) normal open, 1/3 switching loss can be saved, efficiency is higher, but may go out
Existing burst pulse, sampling are easy to be disturbed, and especially when load is smaller, electric current is smaller, since signal is small and noise is big, influence wave
Shape control leads to wave distortion and wrong report failure.And in three-phase modulations mode, all IGBT of each switch periods are at out
Off status is generated heat very big when loading larger.
Above content is only used to facilitate the understanding of the technical scheme, and is not represented and is recognized that above content is existing skill
Art.
Summary of the invention
The main purpose of the present invention is to provide a kind of two-phase-three-phase modulations mode switching circuit and equipment, it is intended to solve
Blower or compressor assembly can not solve two-phase modulation scheme and be applied to that signal-to-noise ratio is low at light load and three-phase modulations in the prior art
Scheme is applied to the big technical problem of calorific value when overloaded.
To achieve the above object, the present invention provides a kind of two-phase-three-phase modulations mode switching circuit, and the circuit includes adopting
Sample circuit, operational amplifier circuit and comparison circuit；Wherein,
The sample circuit, connect with intelligent power module, samples for the electric current to the intelligent power module,
It obtains and sends current signal to the operational amplifier circuit；
The operational amplifier circuit is separately connected with the comparison circuit, the sample circuit and the intelligent power module, is used
Amplify the voltage signal after the current signal is converted to voltage signal, generates and sends first voltage to the comparison
Circuit；
The comparison circuit, connect with microcontroller, is used for when the first voltage is greater than reference voltage to described micro-
Controller export the first level, by make the microcontroller by three-phase modulations in a manner of control the intelligent power module；Institute
Second electrical level is exported to the microcontroller when stating first voltage less than the reference voltage, so that the microcontroller passes through two
Phase modulation system controls the intelligent power module.
Preferably, the operational amplifier circuit includes operation amplifier unit and feedback unit；Wherein, the feedback unit with it is described
Operation amplifier unit and the comparison circuit are separately connected, the operation amplifier unit and the sample circuit and the intelligent function
Rate module is separately connected.
Preferably, the operation amplifier unit includes operational amplifier, first resistor and second resistance；Wherein,
The first end of the first resistor is connect with the down tube emitter of the intelligent power module, the first resistor
Second end is connect with the reverse input end of the operational amplifier；
The first end of the second resistance is connect with the sample circuit, the second end of the second resistance and the operation
The noninverting input of amplifier connects；
The reverse input end of the operational amplifier is also connect with the feedback unit, the output end of the operational amplifier
It is separately connected with the feedback unit and the comparison circuit.
Preferably, the operation amplifier unit further includes 3rd resistor, the first end of the 3rd resistor and described second
The first end of resistance connects, and the second end of the 3rd resistor is connect with the second end of the second resistance.
Preferably, the operation amplifier unit further includes the 4th resistance and first capacitor；The first end of 4th resistance
It is separately connected with the first end of power supply and the first capacitor, the second end of the 4th resistance is same with the operational amplifier
It is connected to input terminal；The second end of the first capacitor is connect with the noninverting input of the operational amplifier.
Preferably, the feedback unit includes the 5th resistance and the 6th resistance；The first end of 5th resistance with it is described
The reverse input end of operational amplifier connects, and the second end of the 5th resistance is connect with the output end of the operational amplifier；
The first end of 6th resistance is connect with the reverse input end of the operational amplifier, the second end of the 6th resistance and institute
State the output end connection of operational amplifier.
Preferably, the feedback unit further includes the second capacitor, the first end of second capacitor and the operation amplifier
The reverse input end of device connects, and the second end of second capacitor is connect with the output end of the operational amplifier.
Preferably, the comparison circuit includes the 7th resistance, the 8th resistance and comparator；Wherein,
The first end and the output end of the operational amplifier and the noninverting input of the comparator of 7th resistance
It being separately connected, the second end of the 7th resistance is connect through the 8th resistance with the power supply, and the second of the 7th resistance
End is also connect with the output end of the comparator；
The inverting input terminal of the comparator receives the reference voltage, the output end of the comparator also with the micro-control
Device connection processed.
Preferably, the sample circuit includes the 9th resistance；The first end of 9th resistance and the intelligent power mould
The down tube emitter of block connects, and the second end of the 9th resistance is connect with the operation amplifier unit, the 9th resistance
Second end is also grounded.
The present invention also proposes a kind of two-phase-three-phase modulations mode switching equipment, and the two-phase-three-phase modulations mode, which switches, to be set
Standby includes two-phase as described above-three-phase modulations mode switching circuit.
Since intelligent power module electric current reflects blower or compressor load size, adopted by intelligent power module electric current
Sample and
The present invention is connect by sample circuit with intelligent power module, is sampled, is obtained to the electric current of intelligent power module
Obtain current signal；Operational amplifier circuit is separately connected with comparison circuit, sample circuit and intelligent power module, and current signal is converted to
Amplify voltage signal after voltage signal, generates first voltage；Comparison circuit is connect with microcontroller, is greater than reference in first voltage
When voltage to microcontroller export the first level, by make microcontroller by three-phase modulations in a manner of control intelligent power module；?
Second electrical level is exported to microcontroller when first voltage is less than reference voltage, so that microcontroller is controlled by two-phase modulation system
Intelligent power module.Wherein, since intelligent power module size of current reflects blower or compressor load size, according to load
Size intelligence switch modulation mode is improving signal-to-noise ratio using three-phase modulations at light load, solves two-phase modulation at light load and event occurs
The problem of barrier wrong report, is using two-phase modulation to reduce fever when overloaded, is solving the problems, such as that three-phase modulations calorific value is excessively high when overloaded.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
The structure shown according to these attached drawings obtains other attached drawings.
Fig. 1 is a kind of functional block diagram of two-phase-one embodiment of three-phase modulations mode switching circuit of the present invention；
Fig. 2 is a kind of structural schematic diagram of two-phase-one embodiment of three-phase modulations mode switching circuit of the present invention.
Drawing reference numeral explanation:
| Label | Title | Label | Title |
| 100 | Sample circuit | MCU | Microcontroller |
| 200 | Operational amplifier circuit | IPM | Intelligent power module |
| 300 | Comparison circuit | R1~R9 | First resistor is to the 9th resistance |
| 210 | Operation amplifier unit | C1~C2 | First capacitor is to the second capacitor |
| 220 | Feedback unit | +5V | Power supply |
| U1 | Operational amplifier | GND | Ground |
| U2 | Comparator |
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
His embodiment, shall fall within the protection scope of the present invention.
It is to be appreciated that if relating to directionality instruction (such as up, down, left, right, before and after ...) in the embodiment of the present invention,
Then directionality instruction be only used for explain under a certain particular pose (as shown in the picture) between each component relative positional relationship,
Motion conditions etc., if the particular pose changes, directionality instruction is also correspondingly changed correspondingly.
In addition, being somebody's turn to do " first ", " second " etc. if relating to the description of " first ", " second " etc. in the embodiment of the present invention
Description be used for description purposes only, be not understood to indicate or imply its relative importance or implicitly indicate indicated skill
The quantity of art feature." first " is defined as a result, the feature of " second " can explicitly or implicitly include at least one spy
Sign.It in addition, the technical solution between each embodiment can be combined with each other, but must be with those of ordinary skill in the art's energy
It is enough realize based on, will be understood that the knot of this technical solution when conflicting or cannot achieve when occurs in the combination of technical solution
Conjunction is not present, also not the present invention claims protection scope within.
The present invention provides a kind of two-phase-three-phase modulations mode switching circuit.
Referring to Fig.1, in one embodiment, the circuit includes sample circuit 100, operational amplifier circuit 200 and comparison circuit
300；Wherein, the sample circuit 100, connect with intelligent power module, for the electricity to the intelligent power module
Stream is sampled, and is obtained and is sent current signal to the operational amplifier circuit 200；The operational amplifier circuit 200, with the comparison circuit
300, the sample circuit 100 and the intelligent power module are separately connected, for the current signal to be converted to voltage
Amplify the voltage signal after signal, generates and sends first voltage to the comparison circuit 300；The comparison circuit 300, with
Microcontroller connection, for electric to microcontroller output first when the first voltage is greater than reference voltage
It is flat, by make the microcontroller by three-phase modulations in a manner of control the intelligent power module；In the first voltage
Second electrical level is exported to the microcontroller when less than the reference voltage, so that the microcontroller passes through two-phase tune
Mode processed controls the intelligent power module.
It should be noted that intelligent power module is to commonly use module in convertible frequency air-conditioner, for driving blower or compression
Two-phase modulation or three-phase modulations scheme is used alone in machine, usual intelligent power module.Each switch week in two-phase modulation scheme
There is a switching tube conducting in phase, can save 1/3 switching loss, high-efficient, still, when blower or compressor load are smaller
When, electric current is small, causes sampled signal small, and noise is big, and signal-to-noise ratio is low, it is easy to be submerged in huge noise after signal distortion,
Lead to the working condition of system erroneous judgement blower or compressor；And because electric current is sufficiently large in three-phase modulations scheme, signal increases
Signal-to-noise ratio improves naturally after big, is not in the above problem in two-phase modulation scheme, but all switches of each switch periods
Pipe is both turned on, and switching loss is big, and when blower or larger compressor load, calorific value is high.
It will be appreciated that resistance is big when blower or big compressor load, electric current is big, and current signal is big in sample circuit,
Therefore intelligent power module size of current reflects blower or compressor load size, samples intelligence by sampling module 100
The electric current of power module IPM, and after current signal is converted into voltage signal by operational amplifier circuit 200, it is input to comparison circuit
In 300 compared with reference voltage, the foundation of blower or compressor load judgement can be used as.
In the concrete realization, when fans load is greater than threshold value, the current signal that sample circuit 100 acquires is larger, amplifier
The first voltage that circuit 200 exports is lower, is less than reference voltage, and comparison circuit 300 exports low level, and microcontroller receives
To after low level, intelligent power module is controlled using two-phase modulation system.
When fans load is less than threshold value, the current signal that sample circuit 100 acquires is smaller, what operational amplifier circuit 200 exported
First voltage is higher, is greater than reference voltage, and comparison circuit 300 exports high level, after microcontroller receives high level, adopts
Intelligent power module is controlled with three-phase modulations mode.
The present embodiment is connect by sample circuit with intelligent power module, is sampled to the electric current of intelligent power module,
Obtain current signal；Operational amplifier circuit is separately connected with comparison circuit, sample circuit and intelligent power module, and current signal is converted
To amplify voltage signal after voltage signal, first voltage is generated；Comparison circuit is connect with microcontroller, is greater than ginseng in first voltage
Export the first level to microcontroller when examining voltage, by make microcontroller by three-phase modulations in a manner of control intelligent power module；
Second electrical level is exported to microcontroller when first voltage is less than reference voltage, so that microcontroller passes through the control of two-phase modulation system
Intelligent power module processed.Wherein, since intelligent power module size of current reflects blower or compressor load size, according to negative
Size intelligence switch modulation mode is carried, is using three-phase modulations to improve signal-to-noise ratio at light load, two-phase modulation at light load is solved and occurs
The problem of fault misdescription, is using two-phase modulation to reduce fever when overloaded, solves that three-phase modulations calorific value is excessively high when overloaded asks
Topic.
Please with reference to Fig. 1 and Fig. 2, Fig. 2 is a kind of two-phase-one embodiment of three-phase modulations mode switching circuit of the present invention
Structural schematic diagram.
In the present embodiment, the operational amplifier circuit 200 includes operation amplifier unit 210 and feedback unit 220；Wherein, described
Feedback unit 220 is separately connected with the operation amplifier unit 210 and the comparison circuit 300, the operation amplifier unit 210
It is separately connected with the sample circuit 100 and the intelligent power module.
It should be noted that feedback unit 220 and the output end and input terminal of operation amplifier unit 210 are separately connected, lead to
The input terminal that feedback resistance feeds back to voltage signal operation amplifier unit 210 is crossed, as 210 amplification factor of operation amplifier unit
The foundation of adjustment.
Specifically, the operation amplifier unit 210 includes operational amplifier U1, first resistor R1 and second resistance R2；Its
In, the first end of the first resistor R1 is connect with the down tube emitter of the intelligent power module, the first resistor R1
Second end connect with the reverse input end of the operational amplifier U1；The first end of the second resistance R2 and sampling electricity
Road 100 connects, and the second end of the second resistance R2 is connect with the noninverting input of the operational amplifier U1；The operation is put
The reverse input end of big device U1 is also connect with the feedback unit 220, the output end of the operational amplifier 210 and the feedback
Unit 220 and the comparison circuit 300 are separately connected.
It should be understood that the down tube emitter, NU foot, NV foot and NW foot including intelligent power module.
In the concrete realization, when blower or smaller compressor load, the electric current of operational amplifier U1 reverse input end is believed
Number smaller, operational amplifier U1 exports higher first voltage to comparison circuit；When blower or larger compressor load, operation
The current signal of amplifier U1 reverse input end is larger, and operational amplifier U1 exports lower first voltage to comparison circuit 300.
Further, the operation amplifier unit 210 further includes 3rd resistor R3, the first end of the 3rd resistor R3 with
The first end of the second resistance R2 connects, and the second end of the second end of the 3rd resistor R3 and the second resistance R2 connect
It connects.
It can be readily appreciated that the nonessential component of 3rd resistor R3, can be increased and decreased according to circuit concrete condition.Work as electric current
When signal is smaller, 3rd resistor R3 is not needed, it, can be in second resistance R2 both ends parallel connection 3rd resistor when current signal is larger
R3。
Further, the operation amplifier unit 210 further includes the 4th resistance R4 and first capacitor C1；4th resistance
The first end of R4 and the first end of power supply+5V and the first capacitor C1 are separately connected, the second end of the 4th resistance R4 with
The noninverting input of the operational amplifier U1 connects；The second end of the first capacitor C1 is same with the operational amplifier U1's
It is connected to input terminal.
It should be noted that different according to specific distribution system, operation amplifier unit 210 can increase by the 4th resistance R4
And first capacitor C1, the 4th capacitor R4 are connect with after first capacitor C1 parallel connection with+5V power supply, by the same mutually defeated of operational amplifier U1
Enter the voltage stabilization at end in 0-5V.
In addition, the feedback unit 220 includes the 5th resistance R5 and the 6th resistance R6；The first end of the 5th resistance R5
It is connect with the reverse input end of the operational amplifier U1, the second end of the 5th resistance R5 is with the operational amplifier U1's
Output end connection；The first end of the 6th resistance R6 is connect with the reverse input end of the operational amplifier U1, and the described 6th
The second end of resistance R6 is connect with the output end of the operational amplifier U1.
It should be understood that the 5th resistance R5 and the 6th resistance R6 is feedback resistance, pass through first resistor R1, the 5th resistance
The control of the resistance ratio of R5 and the 6th resistance R6, can control the amplification factor of operational amplifier U1.
The feedback unit 220 further include the second capacitor C2, the second capacitor C2 first end and the operation amplifier
The reverse input end of device U1 connects, and the second end of the second capacitor C2 is connect with the output end of the operational amplifier U1.
It should be understood that the second capacitor C2 of parallel connection on feedback resistance, can be improved the stability of operational amplifier, suppression
High-frequency noise processed, prevents self-oscillation.
Further, the comparison circuit 300 includes the 7th resistance R7, the 8th resistance R8 and comparator U2；Wherein, described
The first end of 7th resistance R7 connects respectively with the output end of the operational amplifier U1 and the noninverting input of the comparator U2
It connecing, the second end of the 7th resistance R7 is connect through the 8th resistance R8 with the power supply+5V, and the of the 7th resistance R7
Two ends are also connect with the output end of the comparator U2；The inverting input terminal of the comparator U2 receives the reference voltage, institute
The output end for stating comparator U2 is also connect with the microcontroller.
It should be noted that the 7th resistance R7, the 8th resistance R8 and comparator U2 collectively form hysteresis comparator, when first
When voltage is greater than reference voltage, comparator U2 exports high level, and microcontroller receives high level, when first voltage is less than ginseng
When examining voltage, comparator U2 exports low level, and microcontroller receives level.
Further, the sample circuit 100 includes the 9th resistance R9；The first end and the intelligence of the 9th resistance R9
The down tube emitter connection of energy power module IPM, the second end of the 9th resistance R9 and the operation amplifier unit 210 connect
It connects, the second end of the 9th resistance R9 is also grounded GND.
It should be understood that the 9th resistance R9 is sampling resistor, when blower or smaller compressor load, sampling resistor
Electric current is smaller, and current signal is smaller；When blower or larger compressor load, the electric current of sampling resistor is larger, current signal compared with
Greatly.
The present embodiment passes through the specific design of sample circuit, operational amplifier circuit and comparison circuit, samples intelligence by sampling resistor
Can power module electric current, and after current signal is converted into voltage signal by operational amplifier circuit, be input in comparison circuit and
Reference voltage compares, and the switching of two-phase modulation scheme and three-phase modulations scheme is realized according to comparison result, solves two-phase modulation
Scheme is applied to the low easy wrong report failure of signal-to-noise ratio at light load and three-phase modulations scheme is applied to the big technology of calorific value when overloaded
Problem improves the stability of blower or compressor.
Hereinafter, illustrating the working principle of the present embodiment in conjunction with Fig. 1 and Fig. 2:
Sample circuit 100 samples the electric current of intelligent power module, current signal is obtained, when blower or compression
When machine load is smaller, current signal is smaller, and operational amplifier U1 exports higher first voltage, comparator U2 by first voltage with
Reference voltage is compared, and when first voltage is greater than reference voltage Vref, comparator U2 exports high level, microcontroller
After receiving high level, using the intelligent power module of three-phase modulations blower, system signal noise ratio is improved, prevents wrong report failure.
When blower or larger compressor load, when current signal is larger, lower first electricity of operational amplifier U1 output
First voltage is compared by pressure, comparator U2 with reference voltage, when first voltage is less than the reference voltage Vref of comparator U2
When, comparator U2 exports low level, after microcontroller receives low level, converts two-phase modulation for three-phase modulations, uses
Two-phase modulates the intelligent power module of blower, reduces the fever of bridge arm switching tube, to reduce system heat generation.
The present invention also proposes a kind of two-phase-three-phase modulations mode switching equipment, and the two-phase-three-phase modulations mode, which switches, to be set
Standby includes two-phase as described above-three-phase modulations mode switching circuit, the two-phase-three-phase modulations mode switching equipment two
Phase-three-phase modulations mode switching circuit circuit structure can refer to above-described embodiment, and details are not described herein；It is understood that
Since the two-phase-three-phase modulations mode switching equipment of the present embodiment uses above-mentioned two-phase-three-phase modulations mode switching circuit
Technical solution, therefore the two-phase-three-phase modulations mode switching equipment has above-mentioned all beneficial effects.
The above is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all to utilize this hair
Equivalent structure or equivalent flow shift made by bright specification and accompanying drawing content is applied directly or indirectly in other relevant skills
Art field, is included within the scope of the present invention.
Claims (10)
1. a kind of two-phase-three-phase modulations mode switching circuit, which is characterized in that electric including sample circuit, operational amplifier circuit and comparison
Road；Wherein,
The sample circuit, connect with intelligent power module, samples for the electric current to the intelligent power module, obtains
And current signal is sent to the operational amplifier circuit；
The operational amplifier circuit is separately connected with the comparison circuit, the sample circuit and the intelligent power module, and being used for will
The current signal amplifies the voltage signal after being converted to voltage signal, and it is electric to the comparison to generate and send first voltage
Road；
The comparison circuit, connect with microcontroller, is used for when the first voltage is greater than reference voltage to the microcontroller
Device export the first level, by make the microcontroller by three-phase modulations in a manner of control the intelligent power module；Described
Second electrical level is exported to the microcontroller when one voltage is less than the reference voltage, so that the microcontroller passes through two-phase tune
Mode processed controls the intelligent power module.
2. two-phase as described in claim 1-three-phase modulations mode switching circuit, which is characterized in that the operational amplifier circuit includes
Operation amplifier unit and feedback unit；Wherein, the feedback unit and the operation amplifier unit and the comparison circuit are distinguished
Connection, the operation amplifier unit are separately connected with the sample circuit and the intelligent power module.
3. two-phase as claimed in claim 2-three-phase modulations mode switching circuit, which is characterized in that the operation amplifier unit
Including operational amplifier, first resistor and second resistance；Wherein,
The first end of the first resistor is connect with the down tube emitter of the intelligent power module, and the second of the first resistor
End is connect with the reverse input end of the operational amplifier；
The first end of the second resistance is connect with the sample circuit, the second end of the second resistance and the operation amplifier
The noninverting input of device connects；
The reverse input end of the operational amplifier is also connect with the feedback unit, the output end of the operational amplifier and institute
It states feedback unit and the comparison circuit is separately connected.
4. two-phase as claimed in claim 3-three-phase modulations mode switching circuit, which is characterized in that the operation amplifier unit
It further include 3rd resistor, the first end of the 3rd resistor is connect with the first end of the second resistance, the 3rd resistor
Second end is connect with the second end of the second resistance.
5. two-phase as claimed in claim 4-three-phase modulations mode switching circuit, which is characterized in that the operation amplifier unit
It further include the 4th resistance and first capacitor；The first end and power supply of 4th resistance and the first end of the first capacitor are distinguished
Connection, the second end of the 4th resistance are connect with the noninverting input of the operational amplifier；The second of the first capacitor
End is connect with the noninverting input of the operational amplifier.
6. two-phase-three-phase modulations mode switching circuit as described in any one of claim 3 to 5, which is characterized in that described anti-
Presenting unit includes the 5th resistance and the 6th resistance；The first end of 5th resistance and the reverse input end of the operational amplifier
Connection, the second end of the 5th resistance are connect with the output end of the operational amplifier；The first end of 6th resistance with
The reverse input end of the operational amplifier connects, and the second end of the 6th resistance and the output end of the operational amplifier connect
It connects.
7. two-phase as claimed in claim 6-three-phase modulations mode switching circuit, which is characterized in that the feedback unit also wraps
The second capacitor is included, the first end of second capacitor is connect with the reverse input end of the operational amplifier, second capacitor
Second end connect with the output end of the operational amplifier.
8. two-phase as claimed in claim 7-three-phase modulations mode switching circuit, which is characterized in that the comparison circuit includes
7th resistance, the 8th resistance and comparator；Wherein,
The first end of 7th resistance and the noninverting input of the output end of the operational amplifier and the comparator are distinguished
Connection, the second end of the 7th resistance are connect through the 8th resistance with the power supply, and the second end of the 7th resistance is also
It is connect with the output end of the comparator；
The reverse input end of the comparator receives the reference voltage, the output end of the comparator also with the microcontroller
Connection.
9. two-phase as claimed in claim 8-three-phase modulations mode switching circuit, which is characterized in that the sample circuit includes
9th resistance；The first end of 9th resistance is connect with the down tube emitter of the intelligent power module, the 9th resistance
Second end connect with the operation amplifier unit, the second end of the 9th resistance is also grounded.
10. a kind of two-phase-three-phase modulations mode switching equipment, which is characterized in that including such as claim 1-9 any claim
The two-phase-three-phase modulations mode switching circuit.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110690683A (en) * | 2019-11-05 | 2020-01-14 | 四川虹美智能科技有限公司 | Overcurrent protection circuit and overcurrent protection device of intelligent power module |
| CN111669062A (en) * | 2020-03-21 | 2020-09-15 | 青岛鼎信通讯股份有限公司 | System operation method for improving light load and no-load efficiency of energy router |
| CN114745828A (en) * | 2022-03-31 | 2022-07-12 | 中国科学院西安光学精密机械研究所 | High-precision high-power LED constant current source driving circuit |
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| CN111669062A (en) * | 2020-03-21 | 2020-09-15 | 青岛鼎信通讯股份有限公司 | System operation method for improving light load and no-load efficiency of energy router |
| CN114745828A (en) * | 2022-03-31 | 2022-07-12 | 中国科学院西安光学精密机械研究所 | High-precision high-power LED constant current source driving circuit |
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