CN114421432A - Frequency conversion drive circuit, converter and consumer - Google Patents
Frequency conversion drive circuit, converter and consumer Download PDFInfo
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- CN114421432A CN114421432A CN202210156621.3A CN202210156621A CN114421432A CN 114421432 A CN114421432 A CN 114421432A CN 202210156621 A CN202210156621 A CN 202210156621A CN 114421432 A CN114421432 A CN 114421432A
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- 238000006243 chemical reaction Methods 0.000 title claims description 14
- 239000003990 capacitor Substances 0.000 claims abstract description 59
- 238000004146 energy storage Methods 0.000 claims abstract description 47
- 230000001105 regulatory effect Effects 0.000 claims abstract description 36
- 230000001276 controlling effect Effects 0.000 claims abstract description 4
- 238000004378 air conditioning Methods 0.000 claims description 5
- 230000033228 biological regulation Effects 0.000 claims description 5
- 238000001514 detection method Methods 0.000 claims description 5
- 238000005406 washing Methods 0.000 claims description 5
- 239000010409 thin film Substances 0.000 claims description 2
- 238000000034 method Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 4
- 230000006870 function Effects 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
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- 239000010408 film Substances 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000011140 metalized polyester Substances 0.000 description 1
- 238000004377 microelectronic Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 229920006267 polyester film Polymers 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/10—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers
- H02H7/12—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers
- H02H7/122—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for converters; for rectifiers for static converters or rectifiers for inverters, i.e. dc/ac converters
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
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Abstract
The invention relates to a variable frequency driving circuit, a frequency converter and electric equipment, wherein a non-energy-storage capacitor type voltage regulating circuit is arranged between an alternating current signal input end and an inverter, so that a control unit can keep the bus voltage within the normal working range of the inverter by controlling the working state of the non-energy-storage capacitor type voltage regulating circuit, the problem that the inverter is unstable and even damaged due to too low bus voltage in the prior art is solved, the continuity of the current at the input side of the inverter is enhanced, and the stability and the reliability of the inverter are improved.
Description
Technical Field
The invention relates to the technical field of variable frequency driving, in particular to a variable frequency driving circuit, a frequency converter and electric equipment.
Background
The frequency converter is an electric control device which applies a frequency conversion technology and a microelectronic technology and controls an alternating current motor by changing the frequency mode of a working power supply of the motor. The frequency converter mainly comprises a rectifying unit (alternating current to direct current), a filtering unit, an inverting unit (direct current to alternating current), a braking unit, a driving unit, a detection unit micro-processing unit and the like. The frequency converter adjusts the voltage and frequency of an output power supply by switching on and off the internal IGBT, and provides the required power supply voltage according to the actual requirement of the motor, thereby achieving the purposes of energy conservation and speed regulation.
When a resonant scheme is used for designing a variable frequency driver, a low-power electric device (below 16A) can meet the basic requirement of a standard, but after the power current exceeds a certain level (16A), the available voltage of an inverter is reduced along with the fact that the voltage division of a reactor is larger and larger, and the operation of the inverter is unstable. This is particularly true in drives that use electrolytic capacitor-less technology, where too low a bus voltage can even cause inverter damage.
Disclosure of Invention
In view of this, the present invention provides a variable frequency driving circuit, a frequency converter and an electric device, so as to solve the problem in the prior art that the inverter is unstable in operation and even damaged due to too low bus voltage.
According to a first aspect of the embodiments of the present invention, there is provided a variable frequency driving circuit, including: alternating current signal input end, inverter, its characterized in that still includes:
the detection unit is used for detecting the working current of the load;
the non-energy-storage capacitor type voltage regulating circuit is arranged between the alternating current signal input end and the inverter;
and the control unit is used for controlling the working state of the non-energy-storage capacitor type voltage regulating circuit according to the magnitude of the working current so as to keep the bus voltage within the normal working range of the inverter.
Preferably, the variable frequency drive circuit further includes: a rectifier bridge;
the non-energy-storage capacitive voltage regulation circuit comprises:
the first voltage regulating circuit is arranged between the alternating current signal input end and the rectifier bridge;
the second voltage regulating circuit is arranged between the rectifier bridge and the inverter;
the control unit is specifically configured to control the first voltage regulating circuit to be turned on when the working current is less than or equal to a rated maximum working current, and control the second voltage regulating circuit to be turned on when the working current is greater than the rated maximum working current, so that the bus voltage is kept within a normal working range of the inverter.
Preferably, the ac signal input terminal includes: a first phase input, a second phase input, and a third phase input;
the first voltage regulating circuit includes:
the first reactor is arranged on a line connecting the first phase input end with the rectifier bridge;
the second reactor is arranged on a line connecting the second phase input end with the rectifier bridge;
the third reactor is arranged on a line connecting the third phase input end with the rectifier bridge;
the first electric control switch and the first non-energy-storage capacitor are connected in series and bridged between the first phase input end and the second phase input end, and the first electric control switch is connected with the control unit;
the second electric control switch and the second non-energy-storage capacitor are connected in series and bridged between the second phase input end and the third phase input end, and the second electric control switch is connected with the control unit;
and the third electric control switch and the third non-energy-storage capacitor are connected in series and bridged between the first-phase input end and the third-phase input end, and the third electric control switch is connected with the control unit.
Preferably, the second voltage regulating circuit includes:
the fourth electric control switch and the fifth electric control switch are connected in series, and a circuit after the series connection is bridged between the positive bus and the negative bus; the control end of the fourth electric control switch is connected with the control unit, and the control end of the fifth electric control switch is connected with a PWM circuit;
the fourth non-energy storage capacitor is bridged between the positive bus and the negative bus;
and the diode is arranged on the positive bus and used for isolating the fifth electric control switch from the fourth non-energy-storage capacitor.
Preferably, one or more of the first electric control switch, the second electric control switch, the third electric control switch and the fourth electric control switch is a relay; the fifth electric control switch is a triode, and the base of the triode is connected with the PWM circuit.
Preferably, the first non-energy-storage capacitor, the second non-energy-storage capacitor and the third non-energy-storage capacitor are X capacitors; the fourth non-energy-storage capacitor is a thin film capacitor.
Preferably, the control unit is a combination of one or more of the following:
singlechip, DSP treater, PLC controller, ARM treater, FPGA controller.
According to a second aspect of the embodiments of the present invention, there is provided a frequency converter, including:
the variable frequency driving circuit is provided.
According to a third aspect of embodiments of the present invention, there is provided an electric device, including:
the frequency converter is provided.
The electric equipment at least comprises: air conditioning unit, fresh air unit, frequency conversion refrigerator, frequency conversion washing machine.
The technical scheme provided by the embodiment of the invention can have the following beneficial effects:
by arranging the non-energy-storage capacitor type voltage regulating circuit between the alternating current signal input end and the inverter, the control unit controls the working state of the non-energy-storage capacitor type voltage regulating circuit, so that the bus voltage is kept in the normal working range of the inverter, the problem that the inverter is unstable and even damaged due to too low bus voltage in the prior art is solved, the continuity of the current at the input side of the inverter is enhanced, and the stability and the reliability of the inverter are improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the invention, as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic block diagram of a variable frequency drive circuit shown in accordance with an exemplary embodiment;
FIG. 2 is a circuit schematic of a variable frequency drive circuit shown in accordance with an exemplary embodiment;
fig. 3 is a circuit schematic diagram of a prior art frequency conversion driving circuit according to an exemplary embodiment.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the invention, as detailed in the appended claims.
Example one
Fig. 1 is a schematic block diagram illustrating a variable frequency drive circuit according to an exemplary embodiment, the variable frequency drive circuit, as shown in fig. 1, including: alternating current signal input 1, inverter 3 still include:
a detection unit 4 for detecting an operating current of the load;
the non-energy-storage capacitor type voltage regulating circuit 5 is arranged between the alternating current signal input end 1 and the inverter 3;
and the control unit 6 is used for controlling the working state of the non-energy-storage capacitor type voltage regulating circuit 5 according to the magnitude of the working current so as to keep the bus voltage within the normal working range of the inverter 3.
It should be noted that the technical solution provided in this embodiment is applicable to an electric device with a variable frequency driving circuit. The electricity utilization devices include but are not limited to: air conditioning unit, fresh air unit, frequency conversion refrigerator, frequency conversion washing machine. The load includes, but is not limited to: a motor and a compressor.
The detection unit 4 may in particular practice be a current sensor.
The control unit 6 may be a combination of one or more of the following, including:
singlechip, DSP treater, PLC controller, ARM treater, FPGA controller.
In a specific practice, the variable frequency driving circuit further includes: a rectifier bridge 2;
the non-energy-storage capacitor type voltage regulating circuit 5 may include:
a first voltage regulating circuit 51 disposed between the ac signal input terminal 1 and the rectifier bridge 2;
a second voltage regulating circuit 52 provided between the rectifier bridge 2 and the inverter 3;
the control unit 6 is specifically configured to control the first voltage regulating circuit 51 to be turned on when the operating current is less than or equal to the rated maximum operating current, and control the second voltage regulating circuit 52 to be turned on when the operating current is greater than the rated maximum operating current, so that the bus voltage is kept within the normal operating range of the inverter 3.
It can be understood that, according to the technical scheme provided by this embodiment, by adding the voltage regulating circuit, when the working current of the compressor is in different interval values, the on-off of the relay is controlled by the control unit, and finally, the bus voltage can be kept within the normal working range of the inverter at different current levels, so that the voltage stabilizing effect is achieved.
Referring to fig. 2, the ac signal input terminal 1 includes: first phase input terminal VUSecond phase input terminal VVAnd a third phase input terminal VW；
The first voltage regulating circuit 51 includes:
a first reactor L1 arranged at the first phase input end VUThe circuit is connected with the rectifier bridge 2;
a second reactor L2 arranged at the second phase input end VVThe circuit is connected with the rectifier bridge 2;
a third reactor L3 provided at the third phase input terminal VWThe circuit is connected with the rectifier bridge 2;
a first electrically controlled switch K3 and a first non-energy-storage capacitor C3 connected in series and connected across the first phase input end VUAnd a second phase input terminal VVThe first electrically controlled switch K3 is connected to the control unit 6;
a second electrically controlled switch K1 and a second non-energy-storage capacitor C1 connected in series and connected across the second phase input end VVAnd a third phase input terminal VWThe second electrically controlled switch K1 is connected to the control unit 6;
a third electrically controlled switch K2 and a third non-energy-storage capacitor C2 connected in series and connected across the first phase input end VUAnd a third phase input terminal VWSaid third electrically controlled switch K2 is connected to said control unit 6.
The second voltage regulating circuit 52 includes:
the fourth electronic control switch K4 and the fifth electronic control switch Q1 are connected in series, and a circuit after the series connection is connected between the positive bus and the negative bus in a bridge mode; the control end of the fourth electronic control switch K4 is connected with the control unit 6, and the control end of the fifth electronic control switch Q1 is connected with a PWM circuit;
a fourth non-energy-storage capacitor C0 connected between the positive bus and the negative bus in a bridge mode;
and the diode D0 is arranged on the positive bus and used for isolating the fifth electrically controlled switch Q1 from the fourth non-energy-storage capacitor C0.
Preferably, the first electric control switch K3, the second electric control switch K1, the third electric control switch K2 and the fourth electric control switch K4 are relays; the fifth electric control switch Q1 is a triode, and the base electrode of the triode is connected with the PWM circuit.
Preferably, the first non-energy storage capacitor C3, the second non-energy storage capacitor C1 and the third non-energy storage capacitor C2 are X capacitors; the fourth non-energy-storage capacitor C0 is a film capacitor.
It should be noted that the full name of the X capacitor is generally called: x2(X1/X3/MKP) capacitor for suppressing power supply electromagnetic interference. The main roles in the circuit are: and the power supply overline circuit, the EMI filtering circuit, the spark eliminating circuit and the like ensure that the finished product of the electronic product meets the EMC requirement.
For the sake of understanding, referring now to fig. 2, assuming that the load is a compressor and the rated maximum operating current of the compressor is 16A, the operation principle of the inverter driving circuit provided in the present embodiment is explained as follows:
1. when the working current of the compressor is less than or equal to 16A, the relay is controlled by the control unit
K1\ K2\ K3 is closed, the relay K4 is opened, and the inverter is maintained to work stably through resonance generated by the reactors L1-L3 and the X capacitors C1-C3.
Taking the example of a heavy load of the inverter driver circuit, assuming that the current lags the voltage by an angle θ (the lead case is similar to the lag case), the cut-off angle β is less than π/3(60 degrees), and repeats every 1/6 cycles. The capacitor C1/C2/C3 starts to charge or discharge at the beta angle at the moment when the current of each phase flows through zero, and the conduction angle of each diode is pi-beta. In the interval of the U-phase input voltage ω t from θ - β to θ: the diodes D5 and D6 are conducted, C3 and C2 are charged, and the two ends of C1 are load voltages; in the range of the omega t from theta to theta-beta + pi/3: the diodes D1, D5, and D6 conduct. Since the film capacitor C0 has no energy storage function, the inverter is maintained to operate stably through the above steps.
2. When the compressor operating current is greater than 16A, the operating current is increased, and at this time, if the control is performed according to the method 1, the voltage division of the reactor L1\ L2\ L3 is increased, so that the voltage at the position a is very low, and the compressor operation is unreliable. At the moment, the control unit sends out a control signal to open the relays K1\ K2\ K3 and close the relay K4, and at the moment, L1-L3, D1-D6, Q1, D0 and C0 form a voltage boosting loop. The modulation PWM wave is added at the position Q1 to carry out orderly on-off and effective regulation of the voltage at the position a, so that the purpose of voltage boosting is achieved (a BOOST circuit, namely a BOOST circuit, is formed by Q1 and D0 and three inductors L1/L2/L3 at the front end, and therefore the boosting of bus voltage can be achieved), and the harmonic wave of the current level can also be met.
Referring to fig. 3, fig. 3 is a schematic circuit diagram of a variable frequency driving circuit provided in the prior art, where C1 and C2 are large-capacity electrolytic capacitors, R1 and R2 are voltage-sharing resistors, and C3 is a metallized polyester film capacitor.
Compared with the prior art, according to the technical scheme provided by the embodiment, the voltage regulating circuit is added, the on-off of the relay is controlled through the control unit, and when the working current of the compressor is less than or equal to 16A, the capacitor C1\ C2\ C3 is conducted to cause LC resonance to improve the voltage and meet the harmonic wave requirement; when the working current of the compressor is larger than 16A, the Q1 is switched on, the C1\ C2\ C3 channel of the capacitor is switched off, the voltage is improved by adjusting the PWM wave input by the Q1, and finally the requirements of voltage stabilization and harmonic wave under different current levels are met.
It can be understood that, in the technical scheme provided by this embodiment, by providing the non-energy-storage capacitor type voltage regulating circuit between the ac signal input terminal and the inverter, the control unit controls the operating state of the non-energy-storage capacitor type voltage regulating circuit to keep the bus voltage within the normal operating range of the inverter, thereby solving the problem that the inverter is unstable and even damaged due to too low bus voltage in the prior art, enhancing the continuity of the input-side current of the inverter, and improving the stability and reliability of the inverter.
Example two
A frequency converter is shown according to an exemplary embodiment, comprising:
the variable frequency driving circuit is provided.
It should be noted that the technical solution provided in this embodiment is applicable to an electric device with a variable frequency driving circuit. The electricity utilization devices include but are not limited to: air conditioning unit, fresh air unit, frequency conversion refrigerator, frequency conversion washing machine.
It can be understood that, in the technical scheme provided by this embodiment, by providing the non-energy-storage capacitor type voltage regulating circuit between the ac signal input terminal and the inverter, the control unit controls the operating state of the non-energy-storage capacitor type voltage regulating circuit to keep the bus voltage within the normal operating range of the inverter, thereby solving the problem that the inverter is unstable and even damaged due to too low bus voltage in the prior art, enhancing the continuity of the input-side current of the inverter, and improving the stability and reliability of the inverter.
EXAMPLE III
An electrical device is shown according to an exemplary embodiment, comprising:
the frequency converter is provided.
The electricity utilization devices include but are not limited to: air conditioning unit, fresh air unit, frequency conversion refrigerator, frequency conversion washing machine.
It can be understood that, in the technical scheme provided by this embodiment, by providing the non-energy-storage capacitor type voltage regulating circuit between the ac signal input terminal and the inverter, the control unit controls the operating state of the non-energy-storage capacitor type voltage regulating circuit to keep the bus voltage within the normal operating range of the inverter, thereby solving the problem that the inverter is unstable and even damaged due to too low bus voltage in the prior art, enhancing the continuity of the input-side current of the inverter, and improving the stability and reliability of the inverter.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that the terms "first," "second," and the like in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present invention, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A variable frequency drive circuit comprising: alternating current signal input end, inverter, its characterized in that still includes:
the detection unit is used for detecting the working current of the load;
the non-energy-storage capacitor type voltage regulating circuit is arranged between the alternating current signal input end and the inverter;
and the control unit is used for controlling the working state of the non-energy-storage capacitor type voltage regulating circuit according to the magnitude of the working current so as to keep the bus voltage within the normal working range of the inverter.
2. The variable frequency drive circuit according to claim 1, further comprising: a rectifier bridge;
the non-energy-storage capacitive voltage regulation circuit comprises:
the first voltage regulating circuit is arranged between the alternating current signal input end and the rectifier bridge;
the second voltage regulating circuit is arranged between the rectifier bridge and the inverter;
the control unit is specifically configured to control the first voltage regulating circuit to be turned on when the working current is less than or equal to a rated maximum working current, and control the second voltage regulating circuit to be turned on when the working current is greater than the rated maximum working current, so that the bus voltage is kept within a normal working range of the inverter.
3. The variable frequency drive circuit of claim 2, wherein the ac signal input comprises: a first phase input, a second phase input, and a third phase input;
the first voltage regulating circuit includes:
the first reactor is arranged on a line connecting the first phase input end with the rectifier bridge;
the second reactor is arranged on a line connecting the second phase input end with the rectifier bridge;
the third reactor is arranged on a line connecting the third phase input end with the rectifier bridge;
the first electric control switch and the first non-energy-storage capacitor are connected in series and bridged between the first phase input end and the second phase input end, and the first electric control switch is connected with the control unit;
the second electric control switch and the second non-energy-storage capacitor are connected in series and bridged between the second phase input end and the third phase input end, and the second electric control switch is connected with the control unit;
and the third electric control switch and the third non-energy-storage capacitor are connected in series and bridged between the first-phase input end and the third-phase input end, and the third electric control switch is connected with the control unit.
4. The variable frequency drive circuit of claim 2 or 3, wherein the second voltage regulation circuit comprises:
the fourth electric control switch and the fifth electric control switch are connected in series, and a circuit after the series connection is bridged between the positive bus and the negative bus; the control end of the fourth electric control switch is connected with the control unit, and the control end of the fifth electric control switch is externally connected with a PWM circuit;
the fourth non-energy storage capacitor is bridged between the positive bus and the negative bus;
and the diode is arranged on the positive bus and used for isolating the fifth electric control switch from the fourth non-energy-storage capacitor.
5. The variable frequency drive circuit according to claim 4,
one or more of the first electric control switch, the second electric control switch, the third electric control switch and the fourth electric control switch is a relay; the fifth electric control switch is a triode, and the base of the triode is connected with the PWM circuit.
6. The variable frequency drive circuit according to claim 4,
the first non-energy storage capacitor, the second non-energy storage capacitor and the third non-energy storage capacitor are X capacitors; the fourth non-energy-storage capacitor is a thin film capacitor.
7. The variable frequency drive circuit according to any one of claims 1 to 6, wherein the control unit is a combination of one or more of the following:
singlechip, DSP treater, PLC controller, ARM treater, FPGA controller.
8. A frequency converter, comprising:
a variable frequency drive circuit as claimed in any one of claims 1 to 7.
9. An electrical device, comprising:
the frequency converter of claim 8.
10. The consumer device according to claim 9, characterized in that it comprises at least:
air conditioning unit, fresh air unit, frequency conversion refrigerator, frequency conversion washing machine.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210156621.3A CN114421432A (en) | 2022-02-21 | 2022-02-21 | Frequency conversion drive circuit, converter and consumer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210156621.3A CN114421432A (en) | 2022-02-21 | 2022-02-21 | Frequency conversion drive circuit, converter and consumer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN114421432A true CN114421432A (en) | 2022-04-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210156621.3A Pending CN114421432A (en) | 2022-02-21 | 2022-02-21 | Frequency conversion drive circuit, converter and consumer |
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| Country | Link |
|---|---|
| CN (1) | CN114421432A (en) |
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2022
- 2022-02-21 CN CN202210156621.3A patent/CN114421432A/en active Pending
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