CN212463101U - Motor drive circuit, motor control circuit and air conditioner - Google Patents
Motor drive circuit, motor control circuit and air conditioner Download PDFInfo
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- CN212463101U CN212463101U CN202021449098.6U CN202021449098U CN212463101U CN 212463101 U CN212463101 U CN 212463101U CN 202021449098 U CN202021449098 U CN 202021449098U CN 212463101 U CN212463101 U CN 212463101U
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Abstract
The utility model discloses a motor drive circuit, motor control circuit and air conditioner, circuit are used for the drive to have three-phase winding's division winding motor, motor drive circuit includes: a drive circuit for supplying a drive voltage to the three-phase winding; the switch assembly is used for switching off the topology of the winding motor; the rectification filter circuit is used for rectifying and filtering the alternating current input and outputting bus voltage; and the alternating voltage sampling circuit is used for sampling the alternating input. The utility model discloses alternating voltage sampling circuit has been set up for control module can be according to alternating voltage sampling circuit's sampling signal, and control output torque is undulant with busbar voltage synchronization, thereby improves the power factor. The utility model discloses can wide application in the air conditioner field.
Description
Technical Field
The utility model relates to an air conditioner technical field particularly, relates to a motor drive circuit, motor control circuit and air conditioner.
Background
The inverter compressor of the existing inverter air conditioner mostly adopts a permanent magnet motor as a driving motor, a PFC (power factor correction) -free booster circuit can be adopted for a motor driving circuit of a miniaturized motor, and in the PFC-free booster circuit, after an energy storage component of a direct current bus is changed from an electrolytic capacitor with a large capacitance value to a film capacitor with a small capacitance value, the voltage of the direct current bus can fluctuate greatly along with the alternating current input, so that the power factor can be reduced.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the embodiment of the utility model provides a motor drive circuit, motor control circuit and air conditioner can provide the voltage sampling signal of interchange input for control module to make control module can utilize this voltage sampling signal to improve the power factor.
In a first aspect, an embodiment of the present invention provides a motor driving circuit for driving an open winding motor with a three-phase winding, every phase a first three-phase outgoing line group is formed by one end of the winding, every phase a second three-phase outgoing line group is formed by the other end of the winding, the motor driving circuit includes:
the driving circuit is connected with the second three-phase outgoing line group and used for providing driving voltage for the three-phase windings;
the switch assembly comprises a first switch group and a second switch group, the first switch group is connected with the first three-phase outgoing line group, the second switch group is respectively connected with the first three-phase outgoing line group and the second three-phase outgoing line group, when the first switch group is closed and the second switch group is disconnected, the three-phase windings are switched to be in star connection, and when the first switch group is disconnected and the second switch group is closed, the three-phase windings are switched to be in triangular connection;
the rectifying and filtering circuit comprises an output end connected with the driving circuit and an input end used for accessing alternating current;
the alternating voltage sampling circuit is used for acquiring the phase of the alternating current, the alternating voltage sampling circuit comprises an input end and an output end used for outputting a sampling signal to the control module, and the input end of the alternating voltage sampling circuit is connected with the input end of the rectification filter circuit.
The embodiment of the utility model provides a motor drive circuit has following beneficial effect at least: the alternating voltage sampling circuit can be used for sampling the alternating voltage, so that the control module can determine the fluctuation condition of the bus voltage based on the sampling voltage, and the motor can be driven to output the torque synchronously fluctuating with the bus voltage. Simultaneously, this scheme possesses the switch module, can realize opening the switching of triangle-shaped and star topology of winding motor.
In some embodiments of the present invention, the input of the rectifying and filtering circuit comprises a first input and a second input;
the alternating voltage sampling circuit includes:
the first voltage division unit is connected with the first input end of the rectifying and filtering circuit and is used for dividing the voltage to ground of the first input end of the rectifying and filtering circuit so as to output a first sampling signal;
and the second voltage division unit is connected with the second input end of the rectifying and filtering circuit and is used for dividing the voltage to ground of the second input end of the rectifying and filtering circuit so as to output a second sampling signal.
According to the technical scheme, the two input ends of the rectifying filter circuit are subjected to voltage division and sampling through the two voltage division units, so that the control module can detect the fluctuation of bus voltage according to the divided voltage output by the two voltage division units, and the circuit is simple in structure, high in reliability and low in cost.
In some embodiments of the present invention, the first voltage dividing unit comprises a first resistor and a second resistor, and the second voltage dividing unit comprises a third resistor and a fourth resistor;
the first resistor and the second resistor are connected in series between the first input end of the rectifying and filtering circuit and the ground;
the third resistor and the fourth resistor are connected between the second input end of the rectifying and filtering circuit and the ground in series;
the connection point of the first resistor and the second resistor is used for outputting the first sampling signal;
and the connection point of the third resistor and the fourth resistor is used for outputting the second sampling signal.
In the technical scheme, the voltage division unit is realized through the two resistors, and the circuit is simple in structure, high in reliability and low in cost.
In some embodiments of the present invention, the ac voltage sampling circuit includes a fifth resistor, a sixth resistor, a seventh resistor, an operational amplifier, and a bias circuit; the input end of the rectifying and filtering circuit comprises a first input end and a second input end;
the fifth resistor is connected between the negative phase input end of the operational amplifier and the first input end of the rectifying and filtering circuit;
the sixth resistor is connected between the positive phase input end of the operational amplifier and the second input end of the rectification filter circuit;
the seventh resistor is connected between the negative phase input end of the operational amplifier and the output end of the operational amplifier;
the bias circuit is connected with the non-inverting input end of the operational amplifier.
According to the technical scheme, the alternating voltage sampling circuit is formed by the resistors, the operational amplifier and the bias circuit, the precision is high, and the anti-interference capability is strong.
In some embodiments of the present invention, the motor drive circuit further comprises a power circuit;
the power circuit is connected with the output end of the rectification filter circuit and used for converting the voltage of the output end of the rectification filter circuit into the working voltage of the control module.
The power supply circuit is arranged in the technical scheme, and the control module can obtain the working voltage through the power supply circuit without additionally adding an adapter.
In some embodiments of the present invention, the output terminal of the rectifying and filtering circuit includes a first output terminal and a second output terminal;
the power supply circuit includes:
the anode of the diode is connected with the output end of the rectifying and filtering circuit including a first output end;
a first end of the eighth resistor is connected with a cathode of the diode;
a first end of the first capacitor is connected with a second end of the eighth resistor, and the second end of the first capacitor and the second output end of the rectifying and filtering circuit are both grounded;
the DC-DC converter comprises a first input end, a second input end and an output end, the first input end of the DC-DC converter is connected with the eighth resistor, the second input end of the DC-DC converter is grounded, and the output end of the DC-DC converter is used for being connected with the control module.
The technical scheme is provided with the diode which can isolate the direct current-direct current converter from the bus, so that the direct current-direct current converter is prevented from interfering with the bus.
In some embodiments of the present invention, the power circuit further comprises a ninth resistor, and the ninth resistor is connected in parallel with the first capacitor.
Set up the ninth resistance among the above-mentioned technical scheme, it can be when the alternating current disconnection, consume the electric quantity in the first electric capacity fast to accelerate control module outage.
In some embodiments of the present invention, the rectifying and filtering circuit includes:
the rectifier bridge comprises a first input end, a second input end, a first output end and a second output end, and the first input end and the second input end of the rectifier bridge are used as input ends of the rectifier filter circuit;
the thin film capacitor is connected between the first output end and the second output end of the rectifier bridge;
and the filter inductor is connected between the film capacitor and the first output end of the rectifier bridge.
In the technical scheme, the rectifying and filtering circuit is provided with the LC filtering, so that the bus voltage is stabilized under the condition of selecting the thin-film capacitor.
In a second aspect, an embodiment of the present invention provides a motor control circuit, including motor drive circuit and control module, control module respectively with drive circuit with switch module connects, is used for control drive circuit with switch module, alternating voltage sampling circuit's output with control module connects.
The embodiment of the utility model provides a motor control circuit has following beneficial effect at least: the alternating voltage sampling circuit can be used for sampling the alternating voltage, so that the control module can determine the fluctuation condition of the bus voltage based on the sampling voltage, and the motor can be driven to output the torque synchronously fluctuating with the bus voltage. Simultaneously, this scheme possesses the switch module, can realize opening the switching of triangle-shaped and star topology of winding motor.
In some embodiments of the present invention, the control module further comprises a phase-locked loop, the phase-locked loop being connected to the output of the ac voltage sampling circuit.
In the technical scheme, the control module can accurately lock the phase of the alternating-current voltage according to the phase lock.
In a third aspect, an embodiment of the present invention provides an air conditioner, including the above-mentioned motor driving circuit, or including the above-mentioned control circuit.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic diagram of a first circuit provided by an embodiment of the present invention;
fig. 2 is a schematic diagram of a second circuit provided by an embodiment of the present invention;
fig. 3 is a schematic diagram of a third circuit provided by the embodiment of the present invention;
fig. 4 is a schematic diagram of a fourth circuit provided in an embodiment of the present invention;
fig. 5 is a schematic diagram of a fifth circuit provided by the embodiment of the present invention;
fig. 6 is a block diagram of an air conditioner according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.
In the description of the present invention, it should be understood that the orientation or positional relationship indicated with respect to the orientation description, such as up, down, front, rear, left, right, etc., is based on the orientation or positional relationship shown in the drawings, and is only for convenience of description and simplification of description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, at least two means are one or more, a plurality of means are at least two, and the terms greater than, less than, exceeding, etc. are understood as excluding the number, and the terms above, below, within, etc. are understood as including the number. If the first and second are described for the purpose of distinguishing technical features, they are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless there is an explicit limitation, the words such as setting, installation, connection, etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meanings of the above words in combination with the specific contents of the technical solution.
The embodiments of the present invention will be further explained with reference to the drawings.
Referring to fig. 1, an embodiment of the present invention provides a motor driving circuit for driving an open winding motor having a three-phase winding, which can be used in a compressor of an air conditioning system. In the present embodiment, the open-winding motor includes U-phase, V-phase, and W-phase, one end of each phase winding forms a first three-phase outgoing line group, as shown in fig. 1, the first three-phase outgoing line group includes an outgoing line end M1, an outgoing line end M2, and an outgoing line end M3, the other end of each phase winding forms a second three-phase outgoing line group, and the second three-phase outgoing line group includes an outgoing line end M4, an outgoing line end M5, and an outgoing line end M6.
The motor drive circuit includes: the circuit comprises a driving circuit, a switch component, a rectifying and filtering circuit and an alternating voltage sampling circuit.
The driving circuit is connected with the second three-phase outgoing line group and used for providing driving voltage for the three-phase winding; referring to fig. 1, the driving circuit in this embodiment is composed of six transistors, including a first transistor S1, a second transistor S2, a third transistor S3, a fourth transistor S4, a fifth transistor S5, and a sixth transistor S6.
In the present embodiment, taking a triode as an example, an emitter of the first triode S1 is connected to a collector of the second triode S2, an emitter of the third triode S3 is connected to a collector of the fourth triode S4, and an emitter of the fifth triode S5 is connected to a collector of the sixth triode S6. The emitters of the second transistor S2, the fourth transistor S4, and the sixth transistor S6 are all grounded, and the collectors of the first transistor S1, the third transistor S3, and the fifth transistor S5 are all connected to the positive pole of the dc bus. The six triodes can adopt triodes with the same performance parameters, the switching time sequences of the six triodes are controlled by a control module, and the control module controls the conduction states of the triodes by controlling the base voltage of the triodes. In the embodiment, as shown in fig. 1, each transistor of the driving circuit is connected in parallel with a diode, the anode of the diode is connected to the emitter of the transistor, and the cathode of the diode is connected to the collector of the transistor, which can be used for backward freewheeling and protecting the transistor.
The switch assembly comprises a first switch group and a second switch group, the first switch group is connected with the first three-phase outgoing line group, the second switch group is connected with the first three-phase outgoing line group and the second three-phase outgoing line group respectively, when the first switch group is closed and the second switch group is disconnected, the three-phase winding is switched to be in star connection, and when the first switch group is disconnected and the second switch group is closed, the three-phase winding is switched to be in triangular connection. As shown in fig. 1, in the present embodiment, the first switch group includes a first switch S21 and a second switch S22. The second switch set includes a third switch S11, a fourth switch S12, and a fifth switch S13. The first switch S21 is connected between the wire outlet M4 and the wire outlet M5, and the second switch S22 is connected between the wire outlet M6 and the wire outlet M5. Third switch S11 is connected between terminal M2 and terminal M4, fourth switch S12 is connected between terminal M3 and terminal M5, and fifth switch S13 is connected between terminal M1 and terminal M6. It should be understood that the switches in each switch group may be separately controlled switches or integrated switches, and the switches may be mechanical switches such as relays or semiconductor switches such as transistors. In addition, the drawings are only for illustrating the principle, and the arrangement form of the switch in practical application can be distinguished from the principle drawings. Switching between star and triangle topologies can be realized by changing the closing states of the first switch group and the second switch group, so that the control module can switch the circuit topology according to the required rotating speed, and the circuit topology is switched to star connection at low speed and to triangle connection at high speed.
And the rectifying and filtering circuit comprises an output end connected with the driving circuit and an input end used for accessing alternating current.
In the present embodiment, the rectifying and smoothing circuit includes a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, an inductor L, and a second capacitor C2 as shown in fig. 1. The first diode D1, the second diode D2, the third diode D3 and the fourth diode D4 form a full-bridge rectifier bridge, and the inductor L and the second capacitor C2 form an LC filter, so that the functions of rectification and filtering can be realized, and the alternating current input is converted into the direct current output. In the PFC-free motor driving circuit, an electrolytic capacitor with a large volume is removed, and a thin film capacitor with a small capacity and a small volume is replaced. Therefore, the voltage fluctuation of the dc output of the rectifying-smoothing circuit is large. According to the relationship between the torque and the bus voltage, in the case where the bus voltage fluctuates, in order to increase the power factor, it is necessary to control the output torque to fluctuate in synchronization with the bus voltage. Therefore, it is necessary to detect the fluctuation state of the bus voltage.
The alternating voltage sampling circuit comprises an input end and an output end used for outputting sampling signals, and the input end of the alternating voltage sampling circuit is connected with the input end of the rectification filter circuit.
In the present embodiment, the reason for the fluctuation of the bus voltage is that the large-capacity electrolytic capacitor is replaced by the small-capacity film capacitor, and the energy storage capacity is deficient, so that the phase of the bus voltage following the alternating current fluctuates greatly, that is, the fluctuation of the bus voltage is synchronous with the fluctuation of the alternating current input. Therefore, the embodiment configures the alternating voltage sampling circuit to perform voltage detection on the alternating input and output the sampling voltage to the control module, so that the control module can detect the fluctuation state of the bus voltage, thereby controlling the output torque and the bus voltage to fluctuate synchronously and further improving the power factor.
Referring to fig. 1, in some embodiments, the motor driving circuit and the control module form a motor control circuit, the control module is connected to the driving circuit and the switch assembly respectively for controlling the driving circuit and the switch assembly, and the output end of the ac voltage sampling circuit is connected to the control module.
In this embodiment, the control module may be a circuit composed of a single chip or a logic gate device, for example, and controls the driving circuit and the switch module by changing the level signals output to the devices. In some embodiments, the control module comprises a phase-locked loop for phase-locking an output signal of the ac voltage sampling circuit to achieve output torque and bus voltage synchronous fluctuations.
In some embodiments, the input terminals of the rectifying-filtering circuit include a first input terminal and a second input terminal;
the alternating voltage sampling circuit includes:
the first voltage division unit is connected with the first input end of the rectification filter circuit and is used for dividing the voltage to ground of the first input end of the rectification filter circuit so as to output a first sampling signal;
and the second voltage division unit is connected with the second input end of the rectifying and filtering circuit and is used for dividing the voltage to ground of the second input end of the rectifying and filtering circuit so as to output a second sampling signal.
In this embodiment, the two voltage dividing units divide the voltage of the two ends of the ac input, so that the controller can simply convert the current ac voltage according to the difference between the two sampling signals and the sampling ratio, thereby locking the phase. The embodiment has simple structure, low cost and reliability.
Referring to fig. 1 to 3, in these embodiments, the first voltage division unit includes a first resistor R1 and a second resistor R2, and the second voltage division unit includes a third resistor R3 and a fourth resistor R4;
the first resistor R1 and the second resistor R2 are connected in series between the first input end of the rectifying and filtering circuit and the ground GND;
the third resistor R3 and the fourth resistor R4 are connected in series between the second input end of the rectifying and filtering circuit and the ground GND;
the junction of the first resistor R1 and the second resistor R2 is used for outputting a first sampling signal;
the junction of the third resistor R3 and the fourth resistor R4 is used for outputting a second sampling signal.
In this embodiment, it should be understood that the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4 may all be a single resistor, or may be equivalent resistors formed by connecting a plurality of resistors in series or in parallel. In addition, the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 may be formed by discrete components, or may be formed by an integrated device such as a resistor bank. In the present embodiment, the resistance value ratio of the first resistor R1 and the second resistor R2 may be set to be the same as the resistance value ratio of the third resistor R3 and the fourth resistor R4.
In these embodiments, the voltage at the connection point of the first resistor R1 and the second resistor R2 is V1, the voltage at the connection point of the third resistor R3 and the fourth resistor R4 is V2, and the current input voltage can be converted by the formula (V1-V2) (R1+ R2)/R2, so that the phase of the ac voltage can be locked according to the input voltage, and the torque can be controlled to be synchronized with the phase of the input voltage, i.e., synchronized with the fluctuation, so that the power factor can be improved.
In some embodiments, the motor drive circuit further comprises a power supply circuit;
the power circuit is respectively connected with the output end of the rectification filter circuit and the control module and used for converting the voltage of the output end of the rectification filter circuit into the working voltage of the control module.
In this embodiment, the power supply circuit is provided to take power from the direct current output from the filter rectification circuit and directly convert the power to the operating voltage required by the control module, and an independent AC/DC power supply does not need to be additionally provided for the control module, which can contribute to the reduction in size of the entire motor drive circuit. It is to be understood that, in the present embodiment, the power supply circuit may refer to a DC/DC conversion circuit such as a BUCK converter or a BUCK-BOOST converter.
Referring to fig. 1 or 2, in some embodiments, the output of the rectifying-filtering circuit includes a first output and a second output.
The power supply circuit includes:
the anode of the diode D5 and the anode of the diode D5 are connected with the output end of the rectifying and filtering circuit, including the first output end.
The first end of the eighth resistor R8 and the first end of the eighth resistor R8 are connected to the cathode of the diode D5.
The first end of the first capacitor C1, the first end of the first capacitor C1 is connected to the second end of the eighth resistor R8, and the second end of the first capacitor C1 and the second output end of the rectifying and filtering circuit are both grounded to GND.
The direct current-direct current converter comprises a first input end, a second input end and an output end, the first input end of the direct current-direct current converter is connected with the eighth resistor R8, the second input end of the direct current-direct current converter is grounded, and the output end of the direct current-direct current converter is connected with the control module. In the embodiment of fig. 1, the first input terminal of the dc-dc converter is connected to the first terminal of the eighth resistor R8, and in the embodiment of fig. 2, the first input terminal of the dc-dc converter is connected to the second terminal of the eighth resistor R8.
The diode D5 in this embodiment functions to prevent the dc-dc converter from outputting a ripple to the bus, which acts as an isolation. In the present embodiment, the eighth resistor R8 is used to limit the charging current of the first capacitor C1. The first capacitor C1 corresponds to the energy storage capacitor of the dc-dc converter. In the embodiment, the dc-dc converter can be implemented by a BUCK converter or a BUCK-BOOST converter due to low power, and the power supply circuit is a rectifying and filtering circuit, which is helpful for reducing the circuit size.
Referring to fig. 3, in some embodiments, to increase the power-off speed of the control module after the ac input is disconnected, the power circuit further includes a ninth resistor R9, and the ninth resistor R9 is connected in parallel with the first capacitor C1. The ninth resistor R9 can accelerate the discharge of the electric quantity in the first capacitor C1, and shorten the time for the control module to be in an unstable state.
Referring to fig. 4 and 5, in some embodiments, in order to increase the stability and accuracy of the ac voltage sampling circuit, the ac voltage sampling circuit includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an operational amplifier U, and a bias circuit composed of a tenth resistor R10 and an eleventh resistor R11, wherein the tenth resistor R10 and the eleventh resistor R11 are connected in series between a reference voltage VCC, which may be an output voltage of the DC/DC converter, and a ground GND, and a connection point of the tenth resistor R10 and the eleventh resistor R11 is connected as a bias point to a non-inverting input terminal of the operational amplifier U. The input end of the rectifying and filtering circuit comprises a first input end and a second input end.
The fifth resistor R5 is connected between the negative phase input of the operational amplifier U and the first input of the rectifying-filtering circuit.
The sixth resistor R6 is connected between the non-inverting input of the operational amplifier U and the second input of the rectifying-filtering circuit.
The seventh resistor R7 is connected between the negative phase input of the operational amplifier U and the output of the operational amplifier U.
The bias circuit is connected with the non-inverting input end of the operational amplifier U.
In the present embodiment, the value of the fifth resistor R5 and the sixth resistor R6 is equivalent, the value of the tenth resistor R10 and the eleventh resistor R11 is equivalent, R7 is equal to R10 × R11/(R10+ R11. the voltage value of the input voltage is (VCC/2-Uo) × R5/R7., in the present embodiment, Uo is the output voltage of the operational amplifier U, and VCC is 5V, so that it can be simplified to (2.5V-Uo) × R5/R7.
It should be understood that the fifth resistor R5, the sixth resistor R6, the seventh resistor R7, the tenth resistor R10 and the eleventh resistor R11 may be a single resistor, or may be equivalent resistors of a plurality of resistors connected in series or in parallel.
In the present embodiment, the ac voltage detection circuit is configured by using an operational amplifier, which has higher accuracy and higher interference resistance than the ac voltage detection circuits shown in fig. 1 to 3.
The embodiment discloses a circuit board, wherein a lead of a motor driving circuit is printed on the circuit board, and a component for realizing the function of the motor driving circuit is welded on the circuit board. Alternatively, the circuit board is printed with leads of the motor control circuit, and soldered with components for implementing the motor control circuit, where the components include, but are not limited to, resistors, capacitors, inductors, transistors, relays, operational amplifiers, diodes, and transformers.
Referring to fig. 6, the circuit board may be applied in an air conditioner, which may be particularly used to control an open-winding motor in a compressor of the air conditioner.
While the preferred embodiments of the present invention have been described, the present invention is not limited to the above embodiments, and those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and such equivalent modifications or substitutions are intended to be included within the scope of the present invention as defined by the appended claims.
Claims (10)
1. A motor drive circuit for driving an open-winding motor having three-phase windings, one end of each of the phases of the windings constituting a first three-phase outlet group, and the other end of each of the phases of the windings constituting a second three-phase outlet group, the motor drive circuit comprising:
the driving circuit is connected with the second three-phase outgoing line group and used for providing driving voltage for the three-phase windings;
the switch assembly comprises a first switch group and a second switch group, the first switch group is connected with the first three-phase outgoing line group, the second switch group is respectively connected with the first three-phase outgoing line group and the second three-phase outgoing line group, when the first switch group is closed and the second switch group is disconnected, the three-phase windings are switched to be in star connection, and when the first switch group is disconnected and the second switch group is closed, the three-phase windings are switched to be in triangular connection;
the rectifying and filtering circuit comprises an output end connected with the driving circuit and an input end used for accessing alternating current;
the alternating voltage sampling circuit is used for acquiring the phase of the alternating current, the alternating voltage sampling circuit comprises an input end and an output end used for outputting a sampling signal to the control module, and the input end of the alternating voltage sampling circuit is connected with the input end of the rectification filter circuit.
2. A motor drive circuit as claimed in claim 1, wherein said rectifier filter circuit input terminals comprise a first input terminal and a second input terminal;
the alternating voltage sampling circuit includes:
the first voltage division unit is connected with the first input end of the rectifying and filtering circuit and is used for dividing the voltage to ground of the first input end of the rectifying and filtering circuit so as to output a first sampling signal;
and the second voltage division unit is connected with the second input end of the rectifying and filtering circuit and is used for dividing the voltage to ground of the second input end of the rectifying and filtering circuit so as to output a second sampling signal.
3. The motor driving circuit according to claim 2, wherein the first voltage dividing unit includes a first resistor and a second resistor, and the second voltage dividing unit includes a third resistor and a fourth resistor;
the first resistor and the second resistor are connected in series between the first input end of the rectifying and filtering circuit and the ground;
the third resistor and the fourth resistor are connected between the second input end of the rectifying and filtering circuit and the ground in series;
the connection point of the first resistor and the second resistor is used for outputting the first sampling signal;
and the connection point of the third resistor and the fourth resistor is used for outputting the second sampling signal.
4. The motor driving circuit according to claim 1, wherein the alternating voltage sampling circuit comprises a fifth resistor, a sixth resistor, a seventh resistor, an operational amplifier and a bias circuit; the input end of the rectifying and filtering circuit comprises a first input end and a second input end;
the fifth resistor is connected between the negative phase input end of the operational amplifier and the first input end of the rectifying and filtering circuit;
the sixth resistor is connected between the positive phase input end of the operational amplifier and the second input end of the rectification filter circuit;
the seventh resistor is connected between the negative phase input end of the operational amplifier and the output end of the operational amplifier;
the bias circuit is connected with the non-inverting input end of the operational amplifier.
5. A motor drive circuit according to claim 1, further comprising a power supply circuit;
the power circuit is connected with the output end of the rectification filter circuit and used for converting the voltage of the output end of the rectification filter circuit into the working voltage of the control module.
6. A motor drive circuit as claimed in claim 5, wherein the output of the rectifying-filtering circuit comprises a first output and a second output;
the power supply circuit includes:
the anode of the diode is connected with the output end of the rectifying and filtering circuit including a first output end;
a first end of the eighth resistor is connected with a cathode of the diode;
a first end of the first capacitor is connected with a second end of the eighth resistor, and the second end of the first capacitor and the second output end of the rectifying and filtering circuit are both grounded;
the DC-DC converter comprises a first input end, a second input end and an output end, the first input end of the DC-DC converter is connected with the eighth resistor, the second input end of the DC-DC converter is grounded, and the output end of the DC-DC converter is used for being connected with the control module;
and the ninth resistor is connected with the first capacitor in parallel.
7. A motor drive circuit as claimed in claim 1, wherein said rectifying-filtering circuit comprises:
the rectifier bridge comprises a first input end, a second input end, a first output end and a second output end, and the first input end and the second input end of the rectifier bridge are used as input ends of the rectifier filter circuit;
the thin film capacitor is connected between the first output end and the second output end of the rectifier bridge;
and the filter inductor is connected between the film capacitor and the first output end of the rectifier bridge.
8. A motor control circuit comprising a motor driving circuit according to any one of claims 1 to 7 and a control module, wherein the control module is connected to the driving circuit and the switch assembly respectively for controlling the driving circuit and the switch assembly, and an output terminal of the ac voltage sampling circuit is connected to the control module.
9. A motor control circuit as claimed in claim 8, wherein the control module further comprises a phase locked loop connected to the output of the ac voltage sampling circuit.
10. An air conditioner characterized by comprising a motor drive circuit according to any one of claims 1 to 7 or comprising a motor control circuit according to claim 8 or 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021449098.6U CN212463101U (en) | 2020-07-21 | 2020-07-21 | Motor drive circuit, motor control circuit and air conditioner |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021449098.6U CN212463101U (en) | 2020-07-21 | 2020-07-21 | Motor drive circuit, motor control circuit and air conditioner |
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| CN212463101U true CN212463101U (en) | 2021-02-02 |
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| CN202021449098.6U Active CN212463101U (en) | 2020-07-21 | 2020-07-21 | Motor drive circuit, motor control circuit and air conditioner |
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| CN (1) | CN212463101U (en) |
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