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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- 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
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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 invention relates to the technical field of motor control, in particular to a two-phase-three-phase modulation mode switching circuit and equipment.
Background
The driving of a fan or compressor system typically employs a space voltage vector based modulation scheme, which is commonly either a two-phase modulation scheme or a three-phase modulation scheme.
In the two-phase modulation mode, one IGBT (Insulated Gate bipolar transistor) is normally on in each switching period, which can save 1/3 switching loss, and has high efficiency, but narrow pulses may occur, and sampling is easily interfered, especially when a load is small and a current is small, waveform distortion and false alarm faults are caused due to small signals and large noise which affect waveform control. In the three-phase modulation mode, all the IGBTs are in the switching state in each switching period, and when the load is large, the heat generation is large.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a two-phase-three-phase modulation mode switching circuit and equipment, and aims to solve the technical problems that a fan or a compressor system in the prior art cannot solve the problems that the signal-to-noise ratio is low when a two-phase modulation scheme is applied to light load and the heating value is large when a three-phase modulation scheme is applied to heavy load.
In order to achieve the above object, the present invention provides a two-phase to three-phase modulation mode switching circuit, which includes a sampling circuit, an operational amplifier circuit and a comparison circuit; wherein,
the sampling circuit is connected with the intelligent power module and used for sampling the current of the intelligent power module to obtain and send a current signal to the operational amplifier circuit;
the operational amplifier circuit is respectively connected with the comparison circuit, the sampling circuit and the intelligent power module, and is used for converting the current signal into a voltage signal, amplifying the voltage signal, generating and sending a first voltage to the comparison circuit;
the comparison circuit is connected with the microcontroller and used for outputting a first level to the microcontroller when the first voltage is greater than a reference voltage so that the microcontroller controls the intelligent power module in a three-phase modulation mode; and outputting a second level to the microcontroller when the first voltage is smaller than the reference voltage so that the microcontroller controls the intelligent power module in a two-phase modulation mode.
Preferably, the operational amplifier circuit comprises an operational amplifier unit and a feedback unit; the feedback unit is connected with the operational amplification unit and the comparison circuit respectively, and the operational amplification unit is connected with the sampling circuit and the intelligent power module respectively.
Preferably, the operational amplification unit includes an operational amplifier, a first resistor and a second resistor; wherein,
the first end of the first resistor is connected with a lower tube emitter of the intelligent power module, and the second end of the first resistor is connected with the reverse input end of the operational amplifier;
the first end of the second resistor is connected with the sampling circuit, and the second end of the second resistor is connected with the homodromous input end of the operational amplifier;
the inverting input end of the operational amplifier is further connected with the feedback unit, and the output end of the operational amplifier is respectively connected with the feedback unit and the comparison circuit.
Preferably, the operational amplification unit further includes a third resistor, a first end of the third resistor is connected to a first end of the second resistor, and a second end of the third resistor is connected to a second end of the second resistor.
Preferably, the operational amplification unit further includes a fourth resistor and a first capacitor; a first end of the fourth resistor is connected with a power supply and a first end of the first capacitor respectively, and a second end of the fourth resistor is connected with the homodromous input end of the operational amplifier; and the second end of the first capacitor is connected with the homodromous input end of the operational amplifier.
Preferably, the feedback unit includes a fifth resistor and a sixth resistor; a first end of the fifth resistor is connected with an inverting input end of the operational amplifier, and a second end of the fifth resistor is connected with an output end of the operational amplifier; and a first end of the sixth resistor is connected with the inverting input end of the operational amplifier, and a second end of the sixth resistor is connected with the output end of the operational amplifier.
Preferably, the feedback unit further includes a second capacitor, a first end of the second capacitor is connected to the inverting input terminal of the operational amplifier, and a second end of the second capacitor is connected to the output terminal of the operational amplifier.
Preferably, the comparison circuit comprises a seventh resistor, an eighth resistor and a comparator; wherein,
a first end of the seventh resistor is connected with an output end of the operational amplifier and a same-direction input end of the comparator respectively, a second end of the seventh resistor is connected with the power supply through the eighth resistor, and a second end of the seventh resistor is also connected with an output end of the comparator;
the inverting input end of the comparator receives the reference voltage, and the output end of the comparator is also connected with the microcontroller.
Preferably, the sampling circuit includes a ninth resistor; the first end of the ninth resistor is connected with a lower tube emitter of the intelligent power module, the second end of the ninth resistor is connected with the operational amplification unit, and the second end of the ninth resistor is grounded.
The invention also provides two-phase-three-phase modulation mode switching equipment which comprises the two-phase-three-phase modulation mode switching circuit.
Because the current of the intelligent power module reflects the load of the fan or the compressor, the current is sampled and obtained through the intelligent power module
The intelligent power module is connected with the sampling circuit, and the current of the intelligent power module is sampled to obtain a current signal; the operational amplifier circuit is respectively connected with the comparison circuit, the sampling circuit and the intelligent power module, converts the current signal into a voltage signal and then amplifies the voltage signal to generate a first voltage; the comparison circuit is connected with the microcontroller, and outputs a first level to the microcontroller when the first voltage is greater than the reference voltage, so that the microcontroller controls the intelligent power module in a three-phase modulation mode; and outputting a second level to the microcontroller when the first voltage is smaller than the reference voltage so that the microcontroller controls the intelligent power module in a two-phase modulation mode. The intelligent power module is used for controlling the current of the power module to be in a power-saving mode, wherein the current of the intelligent power module reflects the load of the fan or the compressor, the modulation mode is intelligently switched according to the load, the signal to noise ratio is improved by using three-phase modulation during light load, the problem of fault and misinformation of two-phase modulation during light load is solved, the heating is reduced by using two-phase modulation during heavy load, and the problem of overhigh heating value of three-phase modulation during heavy load is.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a functional block diagram of an embodiment of a two-phase to three-phase modulation scheme switching circuit according to the present invention;
fig. 2 is a schematic structural diagram of a two-phase to three-phase modulation scheme switching circuit according to an embodiment of the present invention.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | Sampling circuit | MCU | Micro-controller |
| 200 | Operational amplifier circuit | IPM | Intelligent power module |
| 300 | Comparison circuit | R1～R9 | First to ninth resistors |
| 210 | Operational amplification unit | C1～C2 | First to second capacitors |
| 220 | Feedback unit | +5V | Power supply |
| U1 | Operational amplifier | GND | Ground |
| U2 | Comparator with a comparator circuit |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a two-phase-three-phase modulation mode switching circuit.
Referring to fig. 1, in an embodiment, the circuit includes a sampling circuit 100, an operational amplifier circuit 200, and a comparison circuit 300; the sampling circuit 100 is connected to the intelligent power module IPM, and is configured to sample a current of the intelligent power module IPM, obtain and send a current signal to the operational amplifier circuit 200; the operational amplifier circuit 200 is connected to the comparator circuit 300, the sampling circuit 100 and the intelligent power module IPM, and configured to convert the current signal into a voltage signal, amplify the voltage signal, generate and send a first voltage to the comparator circuit 300; the comparison circuit 300 is connected to the microcontroller MCU, and is configured to output a first level to the microcontroller MCU when the first voltage is greater than a reference voltage, so that the microcontroller MCU controls the intelligent power module IPM in a three-phase modulation manner; and outputting a second level to the microcontroller MCU when the first voltage is less than the reference voltage, so that the microcontroller MCU controls the intelligent power module IPM in a two-phase modulation mode.
It should be noted that the intelligent power module IPM is a module commonly used in the inverter air conditioner and used for driving a fan or a compressor, and generally, the intelligent power module IPM uses a two-phase modulation scheme or a three-phase modulation scheme alone. Each switching period in the two-phase modulation scheme is conducted by one switching tube, so that 1/3 switching loss can be saved, the efficiency is high, however, when the load of the fan or the compressor is small, the current is small, the sampling signal is small, the noise is large, the signal to noise ratio is low, and the signal is easily submerged in huge noise after being distorted, so that the system misjudges the working state of the fan or the compressor; and because the current is enough big in the three-phase modulation scheme, the signal-to-noise ratio improves naturally after the signal increases, the above-mentioned problem in the two-phase modulation scheme can not appear, but all switch tubes of every switching cycle are all switched on, and switching loss is big, and when fan or compressor load is great, the calorific capacity is high.
It can be understood that, when the load of the fan or the compressor is large, the resistance is large, the current is large, and the current signal in the sampling circuit is large, so the current magnitude of the intelligent power module IPM reflects the load magnitude of the fan or the compressor, the current of the intelligent power module IPM is sampled by the sampling module 100, and the current signal is converted into a voltage signal by the operational amplifier circuit 200, and then the voltage signal is input into the comparison circuit 300 to be compared with the reference voltage, which can be used as the basis for judging the load of the fan or the compressor.
In a specific implementation, when the fan load is greater than the threshold, the current signal acquired by the sampling circuit 100 is large, the first voltage output by the operational amplifier circuit 200 is low and is smaller than the reference voltage, the comparison circuit 300 outputs a low level, and the microcontroller MCU controls the intelligent power module IPM in a two-phase modulation mode after receiving the low level.
When the fan load is smaller than the threshold, the current signal collected by the sampling circuit 100 is smaller, the first voltage output by the operational amplifier circuit 200 is higher and larger than the reference voltage, the comparison circuit 300 outputs a high level, and the microcontroller MCU controls the intelligent power module IPM in a three-phase modulation mode after receiving the high level.
In the embodiment, the sampling circuit is connected with the intelligent power module, and is used for sampling the current of the intelligent power module to obtain a current signal; the operational amplifier circuit is respectively connected with the comparison circuit, the sampling circuit and the intelligent power module, converts the current signal into a voltage signal and then amplifies the voltage signal to generate a first voltage; the comparison circuit is connected with the microcontroller, and outputs a first level to the microcontroller when the first voltage is greater than the reference voltage, so that the microcontroller controls the intelligent power module in a three-phase modulation mode; and outputting a second level to the microcontroller when the first voltage is smaller than the reference voltage so that the microcontroller controls the intelligent power module in a two-phase modulation mode. The intelligent power module is used for controlling the current of the power module to be in a power-saving mode, wherein the current of the intelligent power module reflects the load of the fan or the compressor, the modulation mode is intelligently switched according to the load, the signal to noise ratio is improved by using three-phase modulation during light load, the problem of fault and misinformation of two-phase modulation during light load is solved, the heating is reduced by using two-phase modulation during heavy load, and the problem of overhigh heating value of three-phase modulation during heavy load is.
Referring to fig. 1 and fig. 2 together, fig. 2 is a schematic structural diagram of a two-phase to three-phase modulation mode switching circuit according to an embodiment of the present invention.
In this embodiment, the operational amplifier circuit 200 includes an operational amplifier unit 210 and a feedback unit 220; the feedback unit 220 is connected to the operational amplifier unit 210 and the comparator circuit 300, respectively, and the operational amplifier unit 210 is connected to the sampling circuit 100 and the intelligent power module IPM, respectively.
It should be noted that the feedback unit 220 is connected to the output end and the input end of the operational amplification unit 210, respectively, and feeds back the voltage signal to the input end of the operational amplification unit 210 through the feedback resistor, as a basis for adjusting the amplification factor of the operational amplification unit 210.
Specifically, the operational amplification unit 210 includes an operational amplifier U1, a first resistor R1, and a second resistor R2; a first end of the first resistor R1 is connected to a lower tube emitter of the intelligent power module IPM, and a second end of the first resistor R1 is connected to an inverting input terminal of the operational amplifier U1; a first end of the second resistor R2 is connected with the sampling circuit 100, and a second end of the second resistor R2 is connected with a non-inverting input end of the operational amplifier U1; the inverting input terminal of the operational amplifier U1 is further connected to the feedback unit 220, and the output terminal of the operational amplifier 210 is connected to the feedback unit 220 and the comparison circuit 300, respectively.
It should be understood that the lower tube emitter includes the NU, NV and NW pins of the intelligent power module IPM.
In a specific implementation, when the load of the fan or the compressor is small, the current signal of the reverse input end of the operational amplifier U1 is small, and the operational amplifier U1 outputs a first high voltage to the comparison circuit; when the fan or compressor is under a high load, the current signal at the inverting input of the operational amplifier U1 is high, and the operational amplifier U1 outputs a low first voltage to the comparison circuit 300.
Further, the operational amplification unit 210 further includes a third resistor R3, a first end of the third resistor R3 is connected to a first end of the second resistor R2, and a second end of the third resistor R3 is connected to a second end of the second resistor R2.
It is easy to understand that the third resistor R3 is not necessary and can be increased or decreased according to the specific situation of the circuit. When the current signal is small, the third resistor R3 is not needed, and when the current signal is large, the third resistor R3 may be connected in parallel across the second resistor R2.
Further, the operational amplifier unit 210 further includes a fourth resistor R4 and a first capacitor C1; a first end of the fourth resistor R4 is connected to a power supply +5V and a first end of the first capacitor C1, respectively, and a second end of the fourth resistor R4 is connected to a non-inverting input terminal of the operational amplifier U1; the second end of the first capacitor C1 is connected to the non-inverting input of the operational amplifier U1.
It should be noted that, according to different specific power distribution modes, the operational amplification unit 210 may further include a fourth resistor R4 and a first capacitor C1, and the fourth capacitor R4 is connected in parallel with the first capacitor C1 and then connected to the +5V power supply, so as to stabilize the voltage at the non-inverting input terminal of the operational amplifier U1 at 0-5V.
In addition, the feedback unit 220 includes a fifth resistor R5 and a sixth resistor R6; a first end of the fifth resistor R5 is connected with an inverting input end of the operational amplifier U1, and a second end of the fifth resistor R5 is connected with an output end of the operational amplifier U1; the first end of the sixth resistor R6 is connected to the inverting input of the operational amplifier U1, and the second end of the sixth resistor R6 is connected to the output of the operational amplifier U1.
It should be understood that the fifth resistor R5 and the sixth resistor R6 are feedback resistors, and the amplification factor of the operational amplifier U1 can be controlled by controlling the resistance ratio of the first resistor R1, the fifth resistor R5 and the sixth resistor R6.
The feedback unit 220 further includes a second capacitor C2, a first terminal of the second capacitor C2 is connected to the inverting input terminal of the operational amplifier U1, and a second terminal of the second capacitor C2 is connected to the output terminal of the operational amplifier U1.
It should be appreciated that the second capacitor C2 is connected in parallel to the feedback resistor, so as to improve the stability of the operational amplifier, suppress high frequency noise, and prevent self-oscillation.
Further, the comparison circuit 300 includes a seventh resistor R7, an eighth resistor R8, and a comparator U2; a first end of the seventh resistor R7 is connected to the output end of the operational amplifier U1 and the unidirectional input end of the comparator U2, respectively, a second end of the seventh resistor R7 is connected to the +5V power supply via the eighth resistor R8, and a second end of the seventh resistor R7 is further connected to the output end of the comparator U2; the inverting input end of the comparator U2 receives the reference voltage, and the output end of the comparator U2 is also connected with the microcontroller MCU.
It should be noted that the seventh resistor R7, the eighth resistor R8 and the comparator U2 together form a hysteresis comparator, when the first voltage is greater than the reference voltage, the comparator U2 outputs a high level, the microcontroller MCU receives the high level, and when the first voltage is less than the reference voltage, the comparator U2 outputs a low level, and the microcontroller MCU receives the level.
Further, the sampling circuit 100 includes a ninth resistor R9; a first end of the ninth resistor R9 is connected to a lower tube emitter of the intelligent power module IPM, a second end of the ninth resistor R9 is connected to the operational amplifier unit 210, and a second end of the ninth resistor R9 is further connected to GND.
It should be understood that the ninth resistor R9 is a sampling resistor, and when the fan or compressor load is small, the current of the sampling resistor is small, and the current signal is small; when the load of the fan or the compressor is large, the current of the sampling resistor is large, and the current signal is large.
The embodiment is through the concrete design of sampling circuit, fortune amplifier circuit and comparison circuit, through the electric current of sampling resistance sampling intelligent power module to after converting the current signal into voltage signal through fortune amplifier circuit, input and compare with reference voltage in the comparison circuit, realize the switching of two-phase modulation scheme and three-phase modulation scheme according to the comparison result, the technical problem that calorific capacity is big when having solved two-phase modulation scheme and being applied to the heavy load low easy wrong report trouble of SNR when being applied to light load and three-phase modulation scheme and being applied to the heavy load, fan or compressor's stability has been improved.
The working principle of the present embodiment is explained below with reference to fig. 1 and 2:
the sampling circuit 100 samples the current of the intelligent power module IPM to obtain a current signal, when the load of the fan or the compressor is small, the current signal is small, the operational amplifier U1 outputs a first high voltage, the comparator U2 compares the first voltage with a reference voltage, when the first voltage is larger than the reference voltage Vref, the comparator U2 outputs a high level, and after the microcontroller MCU receives the high level, the intelligent power module IPM of the three-phase modulation fan is adopted to improve the signal-to-noise ratio of the system and prevent false alarm faults.
When the load of the fan or the compressor is large and the current signal is large, the operational amplifier U1 outputs a first lower voltage, the comparator U2 compares the first voltage with a reference voltage, when the first voltage is smaller than the reference voltage Vref of the comparator U2, the comparator U2 outputs a low level, the microcontroller MCU receives the low level and converts three-phase modulation into two-phase modulation, and the intelligent power module IPM of the two-phase modulation fan is adopted to reduce the heating of the bridge arm switch tube, so that the heating of the system is reduced.
The present invention further provides a two-phase to three-phase modulation mode switching device, where the two-phase to three-phase modulation mode switching device includes the two-phase to three-phase modulation mode switching circuit, and a circuit structure of the two-phase to three-phase modulation mode switching circuit of the two-phase to three-phase modulation mode switching device may refer to the above-mentioned embodiment, and is not described herein again; it can be understood that, since the two-phase to three-phase modulation scheme switching device of the present embodiment adopts the technical solution of the two-phase to three-phase modulation scheme switching circuit, the two-phase to three-phase modulation scheme switching device has all the above beneficial effects.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A two-phase-three-phase modulation mode switching circuit is characterized by comprising a sampling circuit, an operational amplifier circuit and a comparison circuit; wherein,
the sampling circuit is connected with the intelligent power module and used for sampling the current of the intelligent power module to obtain and send a current signal to the operational amplifier circuit;
the operational amplifier circuit is respectively connected with the comparison circuit, the sampling circuit and the intelligent power module, and is used for converting the current signal into a voltage signal, amplifying the voltage signal, generating and sending a first voltage to the comparison circuit;
the comparison circuit is connected with the microcontroller and used for outputting a first level to the microcontroller when the first voltage is greater than a reference voltage so that the microcontroller controls the intelligent power module in a three-phase modulation mode; and outputting a second level to the microcontroller when the first voltage is smaller than the reference voltage so that the microcontroller controls the intelligent power module in a two-phase modulation mode.
2. The two-phase to three-phase modulation scheme switching circuit according to claim 1, wherein the operational amplifier circuit comprises an operational amplifier unit and a feedback unit; the feedback unit is connected with the operational amplification unit and the comparison circuit respectively, and the operational amplification unit is connected with the sampling circuit and the intelligent power module respectively.
3. The two-phase to three-phase modulation scheme switching circuit according to claim 2, wherein the operational amplification unit comprises an operational amplifier, a first resistor and a second resistor; wherein,
the first end of the first resistor is connected with a lower tube emitter of the intelligent power module, and the second end of the first resistor is connected with the reverse input end of the operational amplifier;
the first end of the second resistor is connected with the sampling circuit, and the second end of the second resistor is connected with the homodromous input end of the operational amplifier;
the inverting input end of the operational amplifier is further connected with the feedback unit, and the output end of the operational amplifier is respectively connected with the feedback unit and the comparison circuit.
4. The two-phase to three-phase modulation scheme switching circuit according to claim 3, wherein the operational amplifier unit further comprises a third resistor, a first end of the third resistor is connected to a first end of the second resistor, and a second end of the third resistor is connected to a second end of the second resistor.
5. The two-phase to three-phase modulation scheme switching circuit according to claim 4, wherein the operational amplifier unit further comprises a fourth resistor and a first capacitor; a first end of the fourth resistor is connected with a power supply and a first end of the first capacitor respectively, and a second end of the fourth resistor is connected with the homodromous input end of the operational amplifier; and the second end of the first capacitor is connected with the homodromous input end of the operational amplifier.
6. The two-three phase modulation scheme switching circuit according to any one of claims 3 to 5, wherein the feedback unit includes a fifth resistor and a sixth resistor; a first end of the fifth resistor is connected with an inverting input end of the operational amplifier, and a second end of the fifth resistor is connected with an output end of the operational amplifier; and a first end of the sixth resistor is connected with the inverting input end of the operational amplifier, and a second end of the sixth resistor is connected with the output end of the operational amplifier.
7. The two-phase to three-phase modulation scheme switching circuit according to claim 6, wherein the feedback unit further comprises a second capacitor, a first terminal of the second capacitor is connected to the inverting input terminal of the operational amplifier, and a second terminal of the second capacitor is connected to the output terminal of the operational amplifier.
8. The two-three phase modulation scheme switching circuit according to claim 7, wherein the comparison circuit comprises a seventh resistor, an eighth resistor and a comparator; wherein,
a first end of the seventh resistor is connected with an output end of the operational amplifier and a same-direction input end of the comparator respectively, a second end of the seventh resistor is connected with the power supply through the eighth resistor, and a second end of the seventh resistor is also connected with an output end of the comparator;
the inverting input end of the comparator receives the reference voltage, and the output end of the comparator is also connected with the microcontroller.
9. The two-three phase modulation scheme switching circuit according to claim 8, wherein the sampling circuit includes a ninth resistor; the first end of the ninth resistor is connected with a lower tube emitter of the intelligent power module, the second end of the ninth resistor is connected with the operational amplification unit, and the second end of the ninth resistor is grounded.
10. A two-three phase modulation scheme switching apparatus comprising the two-three phase modulation scheme switching circuit according to any one of claims 1 to 9.
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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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