CN112803867A - Variable frequency control module and air conditioner - Google Patents
Variable frequency control module and air conditioner Download PDFInfo
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- CN112803867A CN112803867A CN202110178848.3A CN202110178848A CN112803867A CN 112803867 A CN112803867 A CN 112803867A CN 202110178848 A CN202110178848 A CN 202110178848A CN 112803867 A CN112803867 A CN 112803867A
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 45
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- 238000001914 filtration Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 14
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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
- H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
- H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
Abstract
The invention relates to the technical field of variable frequency control, in particular to a variable frequency control module and an air conditioner, wherein the variable frequency control module comprises a signal input circuit, a main control circuit, a driving circuit and a power switch circuit; the signal input circuit is used for acquiring a variable frequency signal; the signal input circuit is connected with the main control circuit, and the main control circuit is used for converting the variable frequency signal into a driving signal; the main control circuit and the power switch circuit are simultaneously connected with the driving circuit, and the power switch circuit is also connected with an external motor; the driving circuit is used for controlling the working state of the power switch circuit according to the driving signal so as to realize the frequency conversion control of the motor. The circuit that this application provided includes several modules of signal input circuit, master control circuit, drive circuit and power switch circuit, simple structure, and the production step is simplified, and production efficiency improves, and this application can adopt domestic frequency conversion chip moreover, not only can reduce production cycle, can also practice thrift the chip cost.
Description
Technical Field
The invention relates to the technical field of variable frequency control, in particular to a variable frequency control module and an air conditioner.
Background
The motor of the frequency conversion refrigerator adopts a frequency conversion power supply, so that the refrigerating capacity of the compressor is adjusted, and the purpose of energy conservation is realized. The compressor driving control of the electric control frequency conversion refrigerator is generally realized by using a 32-bit main chip, three high-voltage bridge drives, 6 IGBTs and one operational amplifier chip. Early inverter drivers for refrigerators also used IPM (Intelligent Power Module), but because of cost issues, the IPM solution was not used in large quantities.
At present, the refrigerator frequency conversion scheme in the industry mostly uses the Meiri series main chip. The main chip has long production period and high cost, and the frequency conversion control module where the main chip is located has a complex circuit structure, so that the frequency conversion refrigerator is complicated in production steps and low in production efficiency.
Disclosure of Invention
In view of the above, the present invention provides a variable frequency control module and an air conditioner, so as to overcome the problems of complicated circuit structure of the variable frequency control module where the current main chip is located, complicated production steps of the variable frequency refrigerator, and low production efficiency.
In order to achieve the purpose, the invention adopts the following technical scheme:
in one aspect, the present invention provides a frequency conversion control module, including: the circuit comprises a signal input circuit, a main control circuit, a driving circuit and a power switch circuit;
the signal input circuit is used for acquiring a variable frequency signal;
the signal input circuit is connected with the main control circuit, and the main control circuit is used for converting the variable frequency signal into a driving signal;
the main control circuit and the power switch circuit are simultaneously connected with the driving circuit, and the power switch circuit is also connected with an external motor;
the driving circuit is used for controlling the working state of the power switch circuit according to the driving signal so as to realize the frequency conversion control of the motor.
Furthermore, the frequency conversion control module also comprises a power circuit;
the input end of the power supply circuit is used for connecting an external power supply;
the main control circuit and the driving circuit are simultaneously connected with a first output end of the power supply circuit;
the power supply circuit is used for converting the external power supply into a first voltage power supply, and the first voltage power supply is provided for the main control circuit and the driving circuit through a first output end of the power supply circuit.
Furthermore, the frequency conversion control module also comprises a bus sampling circuit and a fault alarm circuit;
the second output ends of the main control circuit and the power supply circuit are connected with the bus sampling circuit at the same time;
the master control circuit is also connected with the fault alarm circuit;
the power supply circuit is used for carrying out rectification filtering processing on the bus voltage to obtain a second voltage power supply, and the second voltage power supply is provided for the bus sampling circuit through a second output end of the power supply circuit;
the bus sampling circuit is used for collecting a voltage signal of the second voltage power supply and sending the voltage signal to the main control circuit;
and the main control circuit is used for controlling the fault alarm circuit to send out a first abnormal alarm if the voltage value corresponding to the voltage signal is detected to be out of the range of the preset voltage value.
Furthermore, the frequency conversion control module also comprises a motor sampling circuit and an amplifying circuit;
the motor sampling circuit and the main control circuit are simultaneously connected with the amplifying circuit;
the motor sampling circuit is also connected with the power switch circuit;
the motor sampling circuit is used for collecting an electric signal of the motor;
the amplifying circuit is used for amplifying the electric signal;
and the main control circuit is used for controlling the fault alarm circuit to send out a second abnormal alarm if the parameter value corresponding to the amplified electric signal is detected to be out of the preset parameter value range.
Furthermore, the frequency conversion control module also comprises a back electromotive force sampling circuit;
the motor and the main control circuit are simultaneously connected with the back electromotive force sampling circuit.
Further, in the frequency conversion control module, the signal input circuit includes a first resistor, a second resistor, a third resistor, a first diode, an optocoupler chip, and a first capacitor;
the first end of the optocoupler chip, the first end of the first resistor and the cathode end of the first diode are connected;
the second end of the optical coupling chip is connected with the anode end of the first diode;
the third end of the optocoupler chip, the first end of the first capacitor and the ground wire are connected;
the fourth end of the optical coupling chip, the first end of the second resistor and the first end of the third resistor are connected;
the second end of the second resistor is connected with the power supply end of the main control circuit;
the second end of the third resistor and the second end of the first capacitor are connected with the first signal end of the main control circuit;
and the second end of the first resistor and the second end of the optical coupler chip are used for being connected with the variable frequency signal.
Further, in the above frequency conversion control module, the driving circuit includes three groups of driving units, the power switch circuit includes three groups of power switch units, and one group of driving units is correspondingly connected to one group of power switch units;
the three groups of power switch units are respectively connected with the U end of the motor, the V end of the motor and the W end of the motor;
the three groups of driving units are respectively and correspondingly connected with the first U signal end of the main control circuit, the first V signal end of the main control circuit and the first W signal end of the main control circuit.
Further, in the above frequency conversion control module, the driving circuit further includes a power supply unit;
each group of driving units comprises a fourth resistor, a fifth resistor, a sixth resistor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a second diode and a driving chip;
the first end of the driving chip, the first output end of the power circuit and the first end of the fourth capacitor are connected;
the second end of the driving chip, the first end of the third capacitor and the first end of the fifth resistor are connected; the second end of the fifth resistor is connected with the first interface of the corresponding signal end of the main control circuit;
the third end of the driving chip, the first end of the second capacitor and the first end of the sixth resistor are connected; a second end of the sixth resistor is connected with a second interface of the corresponding signal end of the main control circuit;
the fourth end of the driving chip, the second end of the fourth capacitor, the second end of the third capacitor, the second end of the second capacitor and the ground wire are connected;
the fifth end of the driving chip is connected with the corresponding power switch unit;
the sixth end of the driving chip is connected with the first end of the fifth capacitor;
the seventh end of the driving chip is connected with the corresponding power switch unit;
the eighth end of the driving chip, the second end of the fifth capacitor and the cathode end of the second diode are connected; an anode end of the second diode is connected with a first end of the fourth resistor; and the second end of the fourth resistor is connected with the power supply unit, and the power supply unit is also connected with the first output end of the power supply circuit.
Further, in the frequency conversion control module, the power supply unit includes a voltage regulator tube and a sixth capacitor;
the cathode end of the voltage regulator tube, the first output end of the power supply circuit, the first end of the sixth capacitor and the second end of the fourth resistor are connected;
and the second end of the power supply circuit, the anode end of the voltage regulator tube and the ground wire are connected.
Further, in the frequency conversion control module, each group of the power switch units includes two groups of switch subunits;
each group of the power switch subunits comprises: the fourth resistor, the eighth resistor, the ninth resistor, the fourth diode, the seventh capacitor and the power switch;
the first end of the seventh resistor is connected with the cathode end of the fourth diode;
an anode end of the fourth diode, a first end of the eighth resistor, a first end of the ninth resistor, a first end of the seventh capacitor, and a first end of the power switch are connected;
a second end of the seventh capacitor, a second end of the ninth resistor, and a second end of the power switch are connected;
in the two groups of switch subunits, the third end of the power switch of the first switch subunit is connected with the second output end of the power circuit;
the second end of the power switch of the first switch subunit and the third end of the power switch of the second switch subunit are simultaneously connected with the corresponding ports of the motor;
the second end of the power switch of the second switch subunit is connected with the motor sampling circuit;
the second end of the seventh resistor of the first switch subunit and the second end of the eighth resistor of the first switch subunit are connected with the corresponding seventh end of the driving chip of the driving unit, and the second end of the seventh resistor of the second switch subunit and the second end of the eighth resistor of the second switch subunit are connected with the corresponding fifth end of the driving chip of the driving unit.
Further, in the frequency conversion control module described above, the amplifying circuit includes a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a seventh capacitor, and a ninth capacitor;
a first end of the tenth resistor and a first end of the fifteenth resistor are connected with a second signal end of the main control circuit;
a second end of the fifteenth resistor is connected with a third signal end of the main control circuit;
the second end of the tenth resistor, the first end of the seventh capacitor and the ground wire are connected;
the second end of the seventh capacitor and the first end of the eleventh resistor are connected with the motor sampling circuit;
a second end of the eleventh resistor, a first end of the twelfth resistor and a first end of the thirteenth resistor are connected with a fourth signal end of the main control circuit;
the second end of the twelfth resistor is connected with the power supply end of the main control circuit;
the second end of the thirteenth resistor is connected with the ground wire;
a first end of the fourteenth resistor is connected with a first end of the ninth capacitor, and a second end of the ninth capacitor is connected with the ground wire;
a first end of the fourteenth resistor is connected with a third signal end of the main control circuit, and a second end of the fourteenth resistor and a first end of the ninth capacitor are connected with a fifth signal end of the main control circuit;
and the second end of the ninth capacitor is connected with the ground wire.
Further, in the above frequency conversion control module, the motor sampling circuit includes a sampling resistor;
and the first end of the sampling resistor is connected with the second end of the power switch of the second switch subunit in each switch unit and the first end of the eleventh resistor.
Further, in the above frequency conversion control module, the back electromotive force sampling circuit includes three groups of back electromotive force sampling units;
the three groups of counter electromotive force sampling units are respectively connected with the U end of the motor, the V end of the motor and the W end of the motor; the three groups of counter electromotive force sampling units are also respectively and correspondingly connected with a second U signal end of the main control circuit, a second V signal end of the main control circuit and a second W signal end of the main control circuit;
each set of the back electromotive force sampling units comprises: a sixteenth resistor, a seventeenth resistor and a tenth capacitor;
a first end of the sixteenth resistor, a first end of the tenth capacitor and a first end of the seventeenth resistor are connected with corresponding signal ends in the main control circuit;
the second end of the sixteenth resistor and the second end of the tenth capacitor of each group of back electromotive force sampling units are connected with the ground wire;
and the second end of the seventeenth resistor is connected with a port corresponding to the motor.
Further, in the frequency conversion control module, the fault alarm circuit includes an eighteenth resistor and a light emitting diode;
the first end of the eighteenth resistor is connected with the anode end of the light-emitting diode, the cathode end of the light-emitting diode is connected with the sixth signal end of the main control circuit, and the second end of the eighteenth resistor is connected with the power supply end of the main control circuit.
Further, in the above frequency conversion control module, the power switch includes an IGBT switch.
Further, in the above frequency conversion control module, the motor includes a compressor.
On the other hand, the invention also provides a refrigerator, which comprises the frequency conversion control module;
and the frequency conversion control module is respectively connected with an external power supply and a compressor of the refrigerator.
The invention relates to a variable frequency control module and a refrigerator, wherein the variable frequency control module comprises a signal input circuit, a main control circuit, a drive circuit and a power switch circuit; the signal input circuit is used for acquiring a variable frequency signal; the signal input circuit is connected with the main control circuit, and the main control circuit is used for converting the variable frequency signal into a driving signal; the main control circuit and the power switch circuit are simultaneously connected with the driving circuit, and the power switch circuit is also connected with an external motor; the driving circuit is used for controlling the working state of the power switch circuit according to the driving signal so as to realize the frequency conversion control of the motor. The circuit that this application provided includes several modules of signal input circuit, master control circuit, drive circuit and power switch circuit, simple structure, and the production step is simplified, and production efficiency improves, and this application can adopt domestic frequency conversion chip moreover, not only can reduce production cycle, can also practice thrift the chip cost.
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 drawings without creative efforts.
FIG. 1 is a block diagram of a circuit provided by an embodiment of a variable frequency control module of the present invention;
FIG. 2 is a circuit diagram of a signal input circuit provided by an embodiment of the variable frequency control module of the present invention;
FIG. 3 is a circuit diagram of a driving circuit provided in an embodiment of the variable frequency control module of the present invention;
FIG. 4 is a circuit diagram of a power switching circuit provided by one embodiment of the variable frequency control module of the present invention;
FIG. 5 is a circuit diagram of an amplifying circuit provided by an embodiment of the variable frequency control module of the present invention;
fig. 6 is a circuit diagram of a back electromotive force sampling circuit provided in one embodiment of the variable frequency control module of the present invention;
FIG. 7 is a circuit diagram of a fault warning circuit provided by one embodiment of the variable frequency control module of the present invention;
fig. 8 is a circuit diagram of a main control circuit according to an embodiment of the variable frequency control module of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
Fig. 1 is a circuit block diagram provided by an embodiment of the variable frequency control module of the present invention.
As shown in fig. 1, the frequency conversion control module of this embodiment includes a signal input circuit 10, a main control circuit 11, a driving circuit 12, and a power switch circuit 13.
The signal input circuit 10 is connected with a main control circuit 11, the main control circuit 11 and a power switch circuit 13 are simultaneously connected with a drive circuit 12, and the power switch circuit 13 is also connected with an external motor.
The signal input circuit 10 is configured to obtain a frequency conversion signal, the main control circuit 11 is configured to convert the frequency conversion signal into a driving signal, and the driving circuit 12 is configured to control a working state of the power switch circuit 13 according to the driving signal, so as to implement frequency conversion control on the motor.
If the frequency conversion control module of the embodiment is applied to the refrigerator, the motor is the compressor of the refrigerator, and the frequency conversion control of the refrigerator is further realized.
The frequency conversion control module of the embodiment comprises a signal input circuit 10, a main control circuit 11, a drive circuit 12 and a power switch circuit 13; the signal input circuit 10 is used for acquiring a frequency conversion signal; the signal input circuit 10 is connected with the main control circuit 11, and the main control circuit 11 is used for converting the variable frequency signal into a driving signal; the main control circuit 11 and the power switch circuit 13 are connected with the drive circuit 12 at the same time, and the power switch circuit 13 is also connected with an external motor; the driving circuit 12 is configured to control a working state of the power switching circuit 13 according to the driving signal, so as to implement frequency conversion control on the motor. The circuit provided by the embodiment comprises a signal input circuit 10, a main control circuit 11, a driving circuit 12 and a power switch circuit 13, the structure is simple, the production steps are simplified, the production efficiency is improved, and the embodiment can adopt a domestic frequency conversion chip, so that the production period can be shortened, and the chip cost can be saved.
In some optional embodiments, the variable frequency control module further includes a power circuit 14; the input end of the power circuit 14 is used for connecting an external power supply, for example, the input end of the power circuit 14 can be connected with a mains supply of 176-253 VAC.
As shown in fig. 1, the main control circuit 11 and the driving circuit 12 are connected to a first output terminal of the power circuit 14; the power circuit 14 is configured to convert an external power source into a first voltage power source, and provide the first voltage power source for the main control circuit 11 and the driving circuit 12 through a first output end of the power circuit 14.
For example, the power circuit 14 may convert a commercial power into a 15V, 0.3A first voltage power, and provide the 15V, 0.3A first voltage power for the main control circuit 11 and the driving circuit 12 through the first output terminal of the power circuit 14.
In some optional embodiments, the variable frequency control module further includes a bus sampling circuit 15 and a fault alarm circuit 16.
The second output ends of the main control circuit 11 and the power circuit 14 are connected with the bus sampling circuit 15 at the same time; the main control circuit 11 is also connected to a malfunction alerting circuit 16.
And the power supply circuit 14 is used for performing rectification filtering processing on the bus voltage to obtain a second voltage power supply, and the second voltage power supply is provided for the bus sampling circuit 15 through a second output end of the power supply circuit 14. And the bus sampling circuit 15 is used for acquiring a voltage signal of the second voltage power supply and sending the voltage signal to the main control circuit 11, and the main control circuit 11 is used for controlling the fault alarm circuit 16 to send out a first abnormal alarm if the voltage value corresponding to the voltage signal is detected to be out of the preset voltage value range.
For example, the first anomaly alarm includes an overvoltage fault and an undervoltage fault. And when the voltage value corresponding to the voltage signal is lower than 120VAC, an undervoltage fault is reported, and when the voltage value is higher than 284VAC, an overvoltage fault is reported.
In some optional embodiments, the variable frequency control module further includes a motor sampling circuit 17 and an amplifying circuit 18.
The motor sampling circuit 17 and the main control circuit 11 are connected with the amplifying circuit 18 at the same time, the motor sampling circuit 17 is also connected with the power switch circuit 13, the motor sampling circuit 17 is used for collecting electric signals of a motor, and the amplifying circuit 18 is used for amplifying the electric signals.
And the main control circuit 11 is configured to control the fault alarm circuit 16 to send a second abnormal alarm if the parameter value corresponding to the amplified electrical signal is detected to be outside the preset parameter value range.
For example, if the electrical signal collected from the motor includes a current signal, the fault alarm circuit 16 is controlled to issue an overcurrent alarm if the parameter value corresponding to the amplified current signal is detected to be out of the preset parameter value range.
For another example, in a specific implementation process, if the electrical signal collected from the motor includes a current signal, the amplified current signal is generally converted into a voltage signal, and if the parameter value corresponding to the voltage signal is detected to be outside the preset parameter value range, the fault alarm circuit 16 is controlled to issue an overcurrent alarm.
The preset parameter values may be set by software, for example, converted by a DA converter, and then connected to the main control circuit 11.
In some optional embodiments, the variable frequency control module further includes a back electromotive force sampling circuit 19. The motor and the main control circuit 11 are simultaneously connected with a back electromotive force sampling circuit 19. It should be noted that whether the back electromotive force sampling circuit 19 is adopted may be determined according to actual situations, for example, in a scheme of driving a refrigerator compressor, the back electromotive force sampling circuit 19 may not be connected.
Fig. 2 is a circuit diagram of a signal input circuit provided by an embodiment of the variable frequency control module of the present invention.
In some optional embodiments, as shown in fig. 2, the signal input circuit 10 includes a first resistor R1, a second resistor R2, a third resistor R3, a first diode D1, an optocoupler chip IC1, and a first capacitor C1;
the first end of the optocoupler chip IC1, the first end of the first resistor R1 and the cathode end of the first diode D1 are connected; the second end of the optical coupling chip IC1 is connected with the anode end of the first diode D1; the third end of the optocoupler chip IC1, the first end of the first capacitor C1 and the ground wire HGND are connected; the fourth end of the optical coupling chip IC1, the first end of the second resistor R2 and the first end of the third resistor R3 are connected; a second end of the second resistor R2 is connected to the power supply end of the main control circuit 11; the second terminal of the third resistor R3 and the second terminal of the first capacitor C1 are connected to the first signal terminal of the main control circuit 11.
The first resistor R1, the first capacitor C1, the first end of the optical coupler chip IC1 and the second end of the optical coupler chip IC1 form a signal input unit, and the second end of the first resistor R1 and the second end of the optical coupler chip IC1 are used for being connected with variable frequency signals BPXH + and BPXH-. Optionally, the input frequency conversion signal is a square wave signal of 40-140 Hz, and the corresponding rotation speed is 1200-4200 rpm. The optical coupling chip IC1 is optical coupling isolation, and the isolation is output to the main control circuit 11.
Optionally, the specifications of the first resistor R1 and the third resistor R3 are both 1K; the specification of the second resistor R2 is 1K; the first capacitor C1 is 4.7nF in specification; the first diode D1 is model RLS 4148; the optocoupler chip IC1 is model PC 817C.
FIG. 3 is a circuit diagram of a driving circuit provided in an embodiment of the variable frequency control module of the present invention; fig. 4 is a circuit diagram of a power switch circuit provided by an embodiment of the variable frequency control module of the present invention.
In some alternative embodiments, as shown in fig. 3, the driving circuit 12 includes three sets of driving units 121; as shown in fig. 4, the power switching circuit 13 includes three sets of power switching cells 131. Wherein, a set of drive unit corresponds and connects a set of power switch unit.
The three groups of power switch units are respectively connected with the U end of the motor, the V end of the motor and the W end of the motor; the three groups of driving units are respectively and correspondingly connected with the first U signal end of the main control circuit 11, the first V signal end of the main control circuit 11 and the first W signal end of the main control circuit 11.
Namely, one group of driving units is correspondingly connected with one group of power switch units, the power switch units are connected with the U end of the motor, and the driving units are correspondingly connected with the first U signal end of the main control circuit 11; the other group of driving units is correspondingly connected with the other group of power switch units, the power switch units are connected with the V end of the motor, and the driving units are correspondingly connected with the first V signal end of the main control circuit 11; the last group of driving units is correspondingly connected with the last group of power switch units, the last group of power switch units is connected with the W end of the motor, and the last group of driving units is correspondingly connected with the first W signal end of the main control circuit 11.
In some alternative embodiments, as shown in fig. 3, the driving circuit 12 further includes a power supply unit 122.
In this embodiment, the electronic components included in each group of driving units 121 and the internal connection manner of the electronic components included in each group of driving units 121 are the same, and therefore, the circuit structure will be described by taking one group of driving units 121 as an example.
Specifically, each group of driving units 121 includes a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a second diode D2, and a driving chip IC 2.
The first terminal of the driver IC2, the first output terminal of the power circuit 14, and the first terminal of the fourth capacitor C4 are connected, the voltage output by the first output terminal of the power circuit 14 is 15V, and the interface of the first output terminal of the power circuit 14 is represented by H15V in fig. 3; the second end of the driving chip IC2, the first end of the third capacitor C3 and the first end of the fifth resistor R5 are connected; a second end of the fifth resistor R5 is connected to a first interface of the main control circuit 11 corresponding to the signal end; the third end of the driving chip IC2, the first end of the second capacitor C2 and the first end of the sixth resistor R6 are connected; a second end of the sixth resistor R6 is connected to a second interface of the main control circuit 11 corresponding to the signal end; the fourth end of the driving chip IC2, the second end of the fourth capacitor C4, the second end of the third capacitor C3, the second end of the second capacitor C2 and the ground line HGND are connected; the fifth end of the driving chip IC2 is connected with the corresponding power switch unit; the sixth end of the driving chip IC2 is connected with the first end of the fifth capacitor C5; the seventh end of the driving chip IC2 is connected with the corresponding power switch unit; the eighth terminal of the driving chip IC2, the second terminal of the fifth capacitor C5, and the cathode terminal of the second diode D2 are connected; an anode terminal of the second diode D2 and a first terminal of the fourth resistor R4 are connected; the second terminal of the fourth resistor R4 is connected to the power supply unit 122, and the power supply unit 122 is further connected to the first output terminal of the power supply circuit 14.
In the three groups of driving units, the second end a1 of the fifth resistor R5 of one group of driving units is connected to the first interface of the first U signal end of the main control circuit 11, and the second end B1 of the sixth resistor R6 of one group of driving units is connected to the second interface of the first U signal end of the main control circuit 11, as shown in fig. 3; the second end a2 of the fifth resistor R5 of the other group of driving units is connected to the first interface of the first V signal end of the main control circuit 11, and the second end B2 of the sixth resistor R6 of the other group of driving units is connected to the second interface of the first V signal end of the main control circuit 11; the second terminal A3 of the fifth resistor R5 of the last group of driving units is connected to the first interface of the first W signal terminal of the main control circuit 11, and the second terminal B3 of the sixth resistor R6 of the last group of driving units is connected to the second interface of the first W signal terminal of the main control circuit 11.
A fifth terminal of the driving chip IC2 is marked as LOU, and a seventh terminal of the driving chip IC2 is marked as HOU; a fifth terminal of the driving chip IC2 is marked as LOV, and a seventh terminal of the driving chip IC2 is marked as HOV; the fifth terminal of the driver IC2 is denoted as LOW, and the seventh terminal of the driver IC2 is denoted as HOW, as shown in fig. 3.
Optionally, the specification of the fourth resistor R4 is 10R; the specification of the fifth resistor R5 and the sixth resistor R6 is 100R; the specification of the second capacitor C2 and the third capacitor C3 is 100 pF; the specification of the fourth capacitor C4 is 1 muF/25V; the specification of the fifth capacitor C5 is 10 mu F/25V; the second diode D2 is of type US 1J; the driver chip IC2 is model FD 2606S.
In some alternative embodiments, as shown in fig. 3, the power supply unit 122 includes a voltage regulator D3 and a sixth capacitor C6.
The cathode end of the voltage regulator tube D3, the first output end of the power supply circuit 14, the first end of the sixth capacitor C6 and the second end of the fourth resistor R4 are connected; the second terminal of the power supply circuit 14, the anode terminal of the regulator tube D3, and the ground line HGND are connected.
Optionally, the model of the voltage regulator tube D3 comprises SMA118A, and the specification of the sixth capacitor C6 comprises 47 muF/25V.
In some alternative embodiments, as shown in fig. 4, the electronic components of each group of power switch units 131 and the electronic components of each group of power switch units 131 are connected in the same manner, and this embodiment takes one group of power switch units 131 as an example for description.
Specifically, each group of power switch cells 131 includes two groups of switch subunits. The electronic components in each group of power switch subunits are the same, and the connection modes of the electronic components in each group of power switch subunits are partially the same, and this embodiment takes one group of power switch subunits as an example, and the following description is made:
each group of power switch subunits comprises a seventh resistor R7, an eighth resistor R8, a ninth resistor R9, a fourth diode D4, a seventh capacitor C7 and a power switch IG 3.
A first end of the seventh resistor R7 is connected with a cathode end of the fourth diode D4; an anode terminal of the fourth diode D4, a first terminal of the eighth resistor R8, a first terminal of the ninth resistor R9, a first terminal of the seventh capacitor C7, and a first terminal of the power switch IG3 are connected; a second terminal of the seventh capacitor C7, a second terminal of the ninth resistor R9, and a second terminal of the power switch IG3 are connected.
Wherein the differences are:
in the two sets of switch subunits, the third terminal of the power switch of the first switch subunit 1311 is connected to the second output terminal of the power supply circuit 14, the second output terminal of the power supply circuit 14 outputs the rectified and filtered mains voltage, which is 220VAC, and the interface of the second output terminal of the power supply circuit 14 is denoted by P in fig. 4.
As shown in fig. 4, the second terminal of the power switch of the first switch subunit 1311 and the third terminal of the power switch of the second switch subunit 1312 in one group of power switch units are simultaneously connected to the corresponding ports of the motor, the second terminal of the power switch of the first switch subunit 1311 and the third terminal of the power switch of the second switch subunit 1312 in the other group of power switch units are simultaneously connected to the U terminal of the motor, the second terminal of the power switch of the first switch subunit 1311 and the third terminal of the power switch of the second switch subunit 1312 in the other group of power switch units are simultaneously connected to the V terminal of the motor, and the second terminal of the power switch of the first switch subunit 1311 and the third terminal of the power switch of the second switch subunit 1312 in the last group of power switch units are simultaneously connected to the W terminal of the motor.
The second terminal of the power switch of the second switch subunit 1312 is connected to the motor sampling circuit 17.
A second end of the seventh resistor R7 of the first switch subunit 1311 and a second end of the eighth resistor R8 of the first switch subunit 1311 are connected to a seventh end of the driving chip IC2 of the corresponding driving unit, and a second end of the seventh resistor R7 of the second switch subunit 1312 and a second end of the eighth resistor R8 of the second switch subunit 1312 are connected to a fifth end of the driving chip IC2 of the corresponding driving unit. In a group of power switch units connected with the U end of the motor, the second end of the seventh resistor R7 of the first switch subunit 1311 and the second end of the eighth resistor R8 of the first switch subunit 1311 are connected with the HOU, and the second end of the seventh resistor R7 of the second switch subunit 1312 and the second end of the eighth resistor R8 of the second switch subunit 1312 are connected with the LOU; in a group of power switch units connected with the V end of the motor, the second end of the seventh resistor R7 of the first switch subunit 1311 and the second end of the eighth resistor R8 of the first switch subunit 1311 are connected with HOV, and the second end of the seventh resistor R7 of the second switch subunit 1312 and the second end of the eighth resistor R8 of the second switch subunit 1312 are connected with LOV; in the group of power switch units connected to the W terminal of the motor, the second terminal of the seventh resistor R7 of the first switch subunit 1311 and the second terminal of the eighth resistor R8 of the first switch subunit 1311 are connected to the HOW, and the second terminal of the seventh resistor R7 of the second switch subunit 1312 and the second terminal of the eighth resistor R8 of the second switch subunit 1312 are connected to the LOW, as shown in fig. 4.
Optionally, the specification of the seventh resistor R7 is 47R, the specification of the eighth resistor R8 is 470R, the specification of the ninth resistor R9 is 10K, the model of the fourth diode D4 is RLS4148, the specification of the seventh capacitor C7 is NC/1nF, and the model of the power switch IG3 is AOD5B65M 1.
Fig. 5 is a circuit diagram of an amplifying circuit provided in an embodiment of the variable frequency control module of the present invention.
As shown in fig. 5, the amplifying circuit 18 includes a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, an eighth capacitor C8, and a ninth capacitor C9.
A first end of the tenth resistor R10 and a first end of the fifteenth resistor R15 are connected to the second signal terminal of the main control circuit 11; a second end of the fifteenth resistor R15 is connected to the third signal end of the main control circuit 11; the second end of the tenth resistor R10, the first end of the eighth capacitor C8 and the ground line HGND are connected; the second end of the eighth capacitor C8 and the first end of the eleventh resistor R11 are connected with the motor sampling circuit 17; the second end of the eleventh resistor R11, the first end of the twelfth resistor R12 and the first end of the thirteenth resistor R13 are connected with the fourth signal end of the main control circuit 11; a second end of the twelfth resistor R12 is connected to the power supply terminal of the main control circuit 11; the second end of the thirteenth resistor R13 is connected with the ground line HGND; a first end of the fourteenth resistor R14 is connected to a first end of the ninth capacitor C9, and a second end of the ninth capacitor C9 is connected to the ground line HGND; a first end of the fourteenth resistor R14 is connected to the third signal terminal of the main control circuit 11, and a second end of the fourteenth resistor R14 and a first end of the ninth capacitor C9 are connected to the fifth signal terminal of the main control circuit 11; a second terminal of the ninth capacitor C9 is connected to the ground line HGND.
Optionally, the specifications of the tenth resistor R10, the eleventh resistor R11, the twelfth resistor R12, the thirteenth resistor R13 and the fifteenth resistor R15 are 20K/1%; the specification of the fourteenth resistor R14 is 10K; the specification of the eighth capacitor C8 is 100 nF; the ninth capacitor C9 is sized to be 0.1 μ F/25V.
In some alternative embodiments, the motor sampling circuit 17 includes a sampling resistor RS.
As shown in fig. 4, the first terminal L _ SHUNT of the sampling resistor RS is connected to the second terminal of the power switch of the second switch subunit 1312 in each switch unit, the first terminal of the eleventh resistor R11, and the second terminal of the sampling resistor RS is connected to the ground line HGND.
Optionally, the specification of the sampling resistor RS is 0.1R-2W.
Fig. 6 is a circuit diagram of a back electromotive force sampling circuit provided in an embodiment of the variable frequency control module of the present invention.
In some alternative embodiments, the back emf sampling circuit 19 includes three sets of back emf sampling units 191. The three groups of counter electromotive force sampling units are respectively connected with the U end of the motor, the V end of the motor and the W end of the motor; the three groups of counter electromotive force sampling units are also respectively and correspondingly connected with a second U signal end of the main control circuit 11, a second V signal end of the main control circuit 11 and a second W signal end of the main control circuit 11.
The electronic components of each group of back electromotive force sampling units have partially the same connection manner inside the electronic components of each group of back electromotive force sampling units, and this embodiment takes one group of back electromotive force sampling units as an example, and the following description is made:
each group of back electromotive force sampling units comprises a sixteenth resistor R16, a seventeenth resistor R17 and a tenth capacitor C10.
The first end of the sixteenth resistor R16, the first end of the tenth capacitor C10 and the first end of the seventeenth resistor R17 are connected with corresponding signal ends in the main control circuit 11, and the second end of the seventeenth resistor R17 is connected with a port corresponding to the motor. In the group of counter electromotive force sampling units, a first end of a sixteenth resistor R16, a first end of a tenth capacitor C10 and a first end of a seventeenth resistor R17 are connected with a second U signal end of the main control circuit 11, and a second end of a seventeenth resistor R17 is connected with the U end of the motor; in the other group of counter electromotive force sampling units, the first end of a sixteenth resistor R16, the first end of a tenth capacitor C10 and the first end of a seventeenth resistor R17 are connected with the second V signal end of the main control circuit 11, and the second end of the seventeenth resistor R17 is connected with the V end of the motor; in the last group of counter electromotive force sampling units, the first end of the sixteenth resistor R16, the first end of the tenth capacitor C10, and the first end of the seventeenth resistor R17 are connected to the second W signal end of the main control circuit 11, and the second end of the seventeenth resistor R17 is connected to the W end of the motor.
The second end of the sixteenth resistor R16 and the second end of the tenth capacitor C10 of each group of back electromotive force sampling units are connected with the ground line HGND.
Optionally, the sixteenth resistor R16 is 68K/1%; the seventeenth resistor R17 can choose to use three same resistors, each of which is 330K/1%; the tenth capacitor C10 is sized at 10 nF/25V.
Fig. 7 is a circuit diagram of a fault alarm circuit provided by an embodiment of the variable frequency control module of the present invention.
In some alternative embodiments, the fault alarm circuit 16 includes an eighteenth resistor R18 and a light emitting diode LED. A first end of the eighteenth resistor R18 is connected to an anode end of the light emitting diode LED, a cathode end of the light emitting diode LED is connected to the sixth signal end of the main control circuit 11, and a second end of the eighteenth resistor R18 is connected to a power supply end of the main control circuit 11.
The fault cause can be represented by the number of times of flashing of the light emitting diode LED, for example, the light emitting diode LED flashes 1 time and lacks phase; the LED flickers for 2 times of overvoltage; the LED flickers for 3 times of overvoltage; the LED flickers for 4 times of soft overcurrent; the LED flickers for 5 times and overpower is performed; the LED flickers for 6 times to block the rotation; the LED flickers for 7 times of hardware overcurrent; the LED continuously flickers to input a frequency signal out of range.
Optionally, the power switch described in the above embodiment may adopt an IGBT switch.
Fig. 8 is a circuit diagram of a main control circuit according to an embodiment of the variable frequency control module of the present invention.
In some optional embodiments, as shown in fig. 8, the main control circuit includes a main control chip IC4, an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14, a first electrolytic capacitor CE1, a second electrolytic capacitor CE2, and a JATG interface.
The main control chip IC4 may adopt a pin diagram of a domestic FU6812S chip, a FU6812S chip, and the types of the above electronic components, which can be referred to fig. 8, and this embodiment is not described one by one.
The pin No. 10 of the main control chip IC4, the first end of the thirteenth capacitor C13, the first end of the fourteenth capacitor C14 and the ground line HGND are connected. The pin 9 of the main control chip IC4 and the second terminal of the thirteenth capacitor C13 are connected to the first output terminal of the power supply circuit 14, the voltage output by the first output terminal of the power supply circuit 14 is 15V, and an interface of the first output terminal of the power supply circuit 14 is represented by H15V in fig. 8. The pin 11 of the main control chip IC4 is connected to the second terminal of the fourteenth capacitor C14, and the voltage is regulated to output 5V VDD 5. Pin 23 of the main control chip IC4 is connected to the first terminal of the eleventh capacitor C11, which is configured to output a regulated voltage of 5V VDD5, and the second terminal of the eleventh capacitor C11 is connected to the ground line HGND. Pin No. 13 of the main control chip IC4 is connected to the ground line HGND through a twelfth capacitor C1.
A first terminal of the first electrolytic capacitor CE1 is connected to the first output terminal of the power supply circuit 14, and a second terminal of the first electrolytic capacitor CE1 is connected to the ground line HGND. The first end of the second electrolytic capacitor CE2 is inputted with a voltage VDD5 of 5V, and the second end of the second electrolytic capacitor CE2 is connected to the ground line HGND.
The first end of the JATG interface inputs 5V voltage VDD5, the second end of the JATG interface is connected with a 14 # pin ELCED of the main control chip IC4, the third end of the JATG interface is connected with a 12 # pin ELCEK of the main control chip IC4, and the fourth end of the JATG interface is connected with a ground wire HGND.
Optionally, the port of the main control chip IC4 outputting the 5V voltage VDD5 serves as the power supply terminal of the main control circuit 11.
Optionally, pin 2 SPEEDIN of the main control chip IC4 is used as a first signal terminal of the main control circuit 11; pin H _ DU No. 6 of the main control chip IC4 serves as a first interface of a first U signal end of the main control circuit 11; pin L _ DU No. 3 of the main control chip IC4 serves as a second interface of the first U signal terminal of the main control circuit 11; pin H _ DV 7 of the main control chip IC4 serves as a first interface of the first V signal terminal of the main control circuit 11; pin L _ DV 4 of the main control chip IC4 serves as a second interface of the first V signal terminal of the main control circuit 11; pin H _ DW No. 8 of the main control chip IC4 is used as a first interface of the first W signal end of the main control circuit 11; pin L _ DW No. 5 of the main control chip IC4 serves as a second interface of the first W signal terminal of the main control circuit 11.
Pin AMP0M No. 20 of the optional main control chip IC4 serves as a second signal terminal of the main control circuit 11; pin AMP0O No. 19 of the main control chip IC4 serves as a third signal terminal of the main control circuit 11; pin 21 AMP0P of the main control chip IC4 serves as a fourth signal terminal of the main control circuit 11; pin L _ BUS No. 22 of the main control chip IC4 serves as the fifth signal terminal of the main control circuit 11.
Optionally, pin 15 EMFU of the main control chip IC4 serves as a second U signal terminal of the main control circuit 11; pin EMFV No. 16 of the main control chip IC4 serves as the second V signal terminal of the main control circuit 11; pin EMFW No. 17 of the main control chip IC4 serves as a second W signal terminal of the main control circuit 11.
Optionally, the pin FRR 1 of the main control chip IC4 serves as the sixth signal terminal of the main control circuit 11.
Based on a general inventive concept, the present embodiment provides a refrigerator, including the variable frequency control module described in the above embodiments; the frequency conversion control module is respectively connected with an external power supply and a compressor of the refrigerator.
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.
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 (17)
1. A variable frequency control module, comprising: the circuit comprises a signal input circuit, a main control circuit, a driving circuit and a power switch circuit;
the signal input circuit is used for acquiring a variable frequency signal;
the signal input circuit is connected with the main control circuit, and the main control circuit is used for converting the variable frequency signal into a driving signal;
the main control circuit and the power switch circuit are simultaneously connected with the driving circuit, and the power switch circuit is also connected with an external motor;
the driving circuit is used for controlling the working state of the power switch circuit according to the driving signal so as to realize the frequency conversion control of the motor.
2. The variable frequency control module of claim 1, further comprising a power circuit;
the input end of the power supply circuit is used for connecting an external power supply;
the main control circuit and the driving circuit are simultaneously connected with a first output end of the power supply circuit;
the power supply circuit is used for converting the external power supply into a first voltage power supply, and the first voltage power supply is provided for the main control circuit and the driving circuit through a first output end of the power supply circuit.
3. The variable frequency control module according to claim 2, further comprising a bus sampling circuit, a fault alarm circuit;
the second output ends of the main control circuit and the power supply circuit are connected with the bus sampling circuit at the same time;
the master control circuit is also connected with the fault alarm circuit;
the power supply circuit is used for carrying out rectification filtering processing on the bus voltage to obtain a second voltage power supply, and the second voltage power supply is provided for the bus sampling circuit through a second output end of the power supply circuit;
the bus sampling circuit is used for collecting a voltage signal of the second voltage power supply and sending the voltage signal to the main control circuit;
and the main control circuit is used for controlling the fault alarm circuit to send out a first abnormal alarm if the voltage value corresponding to the voltage signal is detected to be out of the range of the preset voltage value.
4. The variable frequency control module according to claim 3, further comprising a motor sampling circuit, an amplifying circuit;
the motor sampling circuit and the main control circuit are simultaneously connected with the amplifying circuit;
the motor sampling circuit is also connected with the power switch circuit;
the motor sampling circuit is used for collecting an electric signal of the motor;
the amplifying circuit is used for amplifying the electric signal;
and the main control circuit is used for controlling the fault alarm circuit to send out a second abnormal alarm if the parameter value corresponding to the amplified electric signal is detected to be out of the preset parameter value range.
5. The variable frequency control module of claim 1, further comprising a back electromotive force sampling circuit;
the motor and the main control circuit are simultaneously connected with the back electromotive force sampling circuit.
6. The frequency conversion control module of claim 1, wherein the signal input circuit comprises a first resistor, a second resistor, a third resistor, a first diode, an optical coupling chip, and a first capacitor;
the first end of the optocoupler chip, the first end of the first resistor and the cathode end of the first diode are connected;
the second end of the optical coupling chip is connected with the anode end of the first diode;
the third end of the optocoupler chip, the first end of the first capacitor and the ground wire are connected;
the fourth end of the optical coupling chip, the first end of the second resistor and the first end of the third resistor are connected;
the second end of the second resistor is connected with the power supply end of the main control circuit;
the second end of the third resistor and the second end of the first capacitor are connected with the first signal end of the main control circuit;
and the second end of the first resistor and the second end of the optical coupler chip are used for being connected with the variable frequency signal.
7. The frequency conversion control module of claim 4, wherein the driving circuit comprises three sets of driving units, and the power switch circuit comprises three sets of power switch units, and one set of driving units is correspondingly connected to one set of power switch units;
the three groups of power switch units are respectively connected with the U end of the motor, the V end of the motor and the W end of the motor;
the three groups of driving units are respectively and correspondingly connected with the first U signal end of the main control circuit, the first V signal end of the main control circuit and the first W signal end of the main control circuit.
8. The variable frequency control module of claim 7, wherein the drive circuit further comprises a power supply unit;
each group of driving units comprises a fourth resistor, a fifth resistor, a sixth resistor, a second capacitor, a third capacitor, a fourth capacitor, a fifth capacitor, a second diode and a driving chip;
the first end of the driving chip, the first output end of the power circuit and the first end of the fourth capacitor are connected;
the second end of the driving chip, the first end of the third capacitor and the first end of the fifth resistor are connected; the second end of the fifth resistor is connected with the first interface of the corresponding signal end of the main control circuit;
the third end of the driving chip, the first end of the second capacitor and the first end of the sixth resistor are connected; a second end of the sixth resistor is connected with a second interface of the corresponding signal end of the main control circuit;
the fourth end of the driving chip, the second end of the fourth capacitor, the second end of the third capacitor, the second end of the second capacitor and the ground wire are connected;
the fifth end of the driving chip is connected with the corresponding power switch unit;
the sixth end of the driving chip is connected with the first end of the fifth capacitor;
the seventh end of the driving chip is connected with the corresponding power switch unit;
the eighth end of the driving chip, the second end of the fifth capacitor and the cathode end of the second diode are connected; an anode end of the second diode is connected with a first end of the fourth resistor; and the second end of the fourth resistor is connected with the power supply unit, and the power supply unit is also connected with the first output end of the power supply circuit.
9. The variable frequency control module according to claim 8, wherein the power supply unit comprises a voltage regulator tube and a sixth capacitor;
the cathode end of the voltage regulator tube, the first output end of the power supply circuit, the first end of the sixth capacitor and the second end of the fourth resistor are connected;
and the second end of the power supply circuit, the anode end of the voltage regulator tube and the ground wire are connected.
10. The variable frequency control module of claim 8, wherein each group of the power switch units comprises two groups of switch subunits;
each group of the power switch subunits comprises: the fourth resistor, the eighth resistor, the ninth resistor, the fourth diode, the seventh capacitor and the power switch;
the first end of the seventh resistor is connected with the cathode end of the fourth diode;
an anode end of the fourth diode, a first end of the eighth resistor, a first end of the ninth resistor, a first end of the seventh capacitor, and a first end of the power switch are connected;
a second end of the seventh capacitor, a second end of the ninth resistor, and a second end of the power switch are connected;
in the two groups of switch subunits, the third end of the power switch of the first switch subunit is connected with the second output end of the power circuit;
the second end of the power switch of the first switch subunit and the third end of the power switch of the second switch subunit are simultaneously connected with the corresponding ports of the motor;
the second end of the power switch of the second switch subunit is connected with the motor sampling circuit;
the second end of the seventh resistor of the first switch subunit and the second end of the eighth resistor of the first switch subunit are connected with the corresponding seventh end of the driving chip of the driving unit, and the second end of the seventh resistor of the second switch subunit and the second end of the eighth resistor of the second switch subunit are connected with the corresponding fifth end of the driving chip of the driving unit.
11. The variable frequency control module according to claim 10, wherein the amplifying circuit comprises a tenth resistor, an eleventh resistor, a twelfth resistor, a thirteenth resistor, a fourteenth resistor, a fifteenth resistor, a seventh capacitor, and a ninth capacitor;
a first end of the tenth resistor and a first end of the fifteenth resistor are connected with a second signal end of the main control circuit;
a second end of the fifteenth resistor is connected with a third signal end of the main control circuit;
the second end of the tenth resistor, the first end of the seventh capacitor and the ground wire are connected;
the second end of the seventh capacitor and the first end of the eleventh resistor are connected with the motor sampling circuit;
a second end of the eleventh resistor, a first end of the twelfth resistor and a first end of the thirteenth resistor are connected with a fourth signal end of the main control circuit;
the second end of the twelfth resistor is connected with the power supply end of the main control circuit;
the second end of the thirteenth resistor is connected with the ground wire;
a first end of the fourteenth resistor is connected with a first end of the ninth capacitor, and a second end of the ninth capacitor is connected with the ground wire;
a first end of the fourteenth resistor is connected with a third signal end of the main control circuit, and a second end of the fourteenth resistor and a first end of the ninth capacitor are connected with a fifth signal end of the main control circuit;
and the second end of the ninth capacitor is connected with the ground wire.
12. The variable frequency control module of claim 11, wherein the motor sampling circuit comprises a sampling resistor;
and the first end of the sampling resistor is connected with the second end of the power switch of the second switch subunit in each switch unit and the first end of the eleventh resistor.
13. The variable frequency control module according to claim 5, wherein the back electromotive force sampling circuit comprises three groups of back electromotive force sampling units;
the three groups of counter electromotive force sampling units are respectively connected with the U end of the motor, the V end of the motor and the W end of the motor; the three groups of counter electromotive force sampling units are also respectively and correspondingly connected with a second U signal end of the main control circuit, a second V signal end of the main control circuit and a second W signal end of the main control circuit;
each set of the back electromotive force sampling units comprises: a sixteenth resistor, a seventeenth resistor and a tenth capacitor;
a first end of the sixteenth resistor, a first end of the tenth capacitor and a first end of the seventeenth resistor are connected with corresponding signal ends in the main control circuit;
the second end of the sixteenth resistor and the second end of the tenth capacitor of each group of back electromotive force sampling units are connected with the ground wire;
and the second end of the seventeenth resistor is connected with a port corresponding to the motor.
14. The variable frequency control module according to claim 3, wherein the fault warning circuit comprises an eighteenth resistor and a light emitting diode;
the first end of the eighteenth resistor is connected with the anode end of the light-emitting diode, the cathode end of the light-emitting diode is connected with the sixth signal end of the main control circuit, and the second end of the eighteenth resistor is connected with the power supply end of the main control circuit.
15. The variable frequency control module of claim 10, wherein the power switches comprise IGBT switches.
16. The variable frequency control module of claim 1, wherein the motor comprises a compressor.
17. A refrigerator, characterized by comprising the variable frequency control module of any one of claims 1 to 16;
and the frequency conversion control module is respectively connected with an external power supply and a compressor of the refrigerator.
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| CN202110178848.3A CN112803867A (en) | 2021-02-08 | 2021-02-08 | Variable frequency control module and air conditioner |
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| CN202110178848.3A CN112803867A (en) | 2021-02-08 | 2021-02-08 | Variable frequency control module and air conditioner |
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2021
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Application publication date: 20210514 |