CN213783174U - Motor driving system and central range hood applying same - Google Patents
Motor driving system and central range hood applying same Download PDFInfo
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- CN213783174U CN213783174U CN202021821175.6U CN202021821175U CN213783174U CN 213783174 U CN213783174 U CN 213783174U CN 202021821175 U CN202021821175 U CN 202021821175U CN 213783174 U CN213783174 U CN 213783174U
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Abstract
The utility model relates to a motor driving system, which comprises a driving controller; a rectifying circuit electrically connected to an external AC power supply; the driving circuit comprises a PFC circuit electrically connected with the rectifying circuit and the driving controller and an inverter circuit electrically connected with the PFC circuit and the driving controller; the first port is electrically connected with the inverter circuit; and the load type detection circuit is electrically connected with the inverter circuit and the drive controller. The utility model also relates to a central range hood, which comprises a motor driving system, a central controller and a second port, wherein the central controller is in communication connection with the driving controller, and the second port is electrically connected with an inverter circuit of the motor driving system; a fan load electrically connectable to the first port or an external range hood electrically connectable to the second port. The central range hood can improve the speed regulation performance requirement and compatibility.
Description
Technical Field
The utility model relates to a motor drive system still relates to the central range hood who uses this system.
Background
The existing electric appliance needing speed regulation, such as a range hood, can be provided with an alternating current motor or a direct current motor for speed regulation control. When the alternating current motor is used for speed regulation, the speed regulation of the alternating current motor adopts a control mode of sectional speed regulation of a tap motor, the tap motor is used for speed regulation at a fixed gear, the speed regulation range is limited, and stepless speed regulation cannot be realized. The direct current motor can effectively realize stepless speed regulation and improve the speed regulation performance. However, different drivers are required for different motors, and the existing direct current motor driver only has the function of independently driving the direct current motor and is not compatible with the function of driving the alternating current motor. And the control circuit of the alternating current motor cannot be compatible with the function of driving the direct current motor. Therefore, when the driver is installed, the type of the load motor needs to be determined first, and then the corresponding driver needs to be installed selectively. If the driving of the direct current motor and the alternating current motor can be compatible, the driving circuit of the direct current motor and the driving circuit of the alternating current motor need to be used in an accumulated mode, so that the area of a printed board is enlarged, the speed regulation of the alternating current motor is not optimized, and the speed regulation performance of the alternating current motor is obviously lower than that of the direct current motor.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the first technical problem that a motor drive system that can compatible alternating current-direct current motor drive is provided to above-mentioned prior art.
The utility model aims to solve the second technical problem that a central range hood that promotes speed governing performance demand and compatibility is provided to above-mentioned prior art.
The utility model provides a technical scheme that above-mentioned first technical problem adopted does: a motor drive system includes
A drive controller;
the rectifying circuit is electrically connected with an external alternating current power supply and is used for rectifying alternating current input voltage into direct current voltage;
the method is characterized in that: also comprises
The driving circuit comprises a PFC circuit electrically connected with the rectifying circuit and the driving controller and an inverter circuit electrically connected with the PFC circuit and the driving controller;
the first port is electrically connected with the inverter circuit and is used for connecting a motor load;
and the load type detection circuit is electrically connected with the inverter circuit and the drive controller and is used for detecting whether the motor load connected to the first port is an alternating current motor or a direct current motor.
In order to effectively detect the voltage fluctuation of an external alternating current power supply and effectively adjust the driving of a load under the condition of the voltage fluctuation of the external alternating current power supply to ensure the stable operation of the load, the device also comprises an alternating current voltage detection circuit electrically connected with the input end of the rectification circuit and a direct current voltage detection circuit electrically connected with the output end of the PFC circuit, wherein the alternating current voltage detection circuit and the direct current voltage detection circuit are respectively and electrically connected with the driving controller.
Preferably, the alternating voltage detection circuit includes a first amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first diode, a second diode, a first capacitor, a second capacitor, a third capacitor, an eighth capacitor, and a ninth capacitor;
the first input end of the first amplifier is electrically connected with one end of an external alternating current power supply through a third resistor and a first resistor which are connected in series, wherein the second end of the third resistor is electrically connected with the first end of the first resistor;
the anode of the first diode is connected with the first end of the fourth resistor, the cathode of the first diode is electrically connected with the first end of the third resistor, the anode of the second diode is electrically connected with the first end of the third resistor, and the cathode of the second diode is connected with the first end of the fourth resistor;
the first input end of the first amplifier is also electrically connected with the first end of a fifth resistor and the first end of a sixth resistor respectively, the second end of the fifth resistor is electrically connected with the module power supply end of the alternating-current voltage detection circuit, and the second end of the sixth resistor is grounded; the second input end of the first amplifier is also electrically connected with the driving controller through a seventh resistor and an eighth resistor which are connected in series, wherein the second end of the seventh resistor is electrically connected with the first end of the eighth resistor, the output end of the first amplifier is electrically connected with the second end of the seventh resistor, and the second end of the eighth resistor is grounded through a ninth capacitor;
and the power supply end of the first amplifier is grounded through an eighth capacitor.
Preferably, the dc voltage detection circuit includes a seventh capacitor, a third diode, a fourth diode, a twenty-eighth resistor, a twenty-ninth resistor, a thirty-eighth resistor, and a thirty-first resistor;
the twenty-eighth resistor, the twenty-ninth resistor, the thirty-fifth resistor and the thirty-fifth resistor are connected between the output end of the PFC circuit and the ground wire in series, wherein the first end of the twenty-eighth resistor is electrically connected with the output end of the PFC circuit, the second end of the twenty-eighth resistor is electrically connected with the first end of the twenty-ninth resistor, the second end of the twenty-ninth resistor is electrically connected with the first end of the thirty-fifth resistor, and the second end of the thirty-fifth resistor is electrically connected with the first end of the thirty-fifth resistor;
the negative electrode of the third diode is electrically connected with the module power supply end of the direct-current voltage detection circuit, the positive electrode of the third diode is electrically connected with the negative electrode of the fourth diode, the positive electrode of the fourth diode is grounded, the second end of the thirty-first resistor is electrically connected with the negative electrode of the fourth diode, and two ends of the seventh capacitor are respectively electrically connected with two electrodes of the fourth diode.
In order to expand the application range of the motor driving system, the motor driving system further comprises a second port for connecting an external alternating current load, the second port is provided with two connecting ends, and each connecting end is electrically connected with the driving controller through a second relay and a third relay respectively.
Preferably, the inverter circuit is an IPM module.
Preferably, the driving controller is electrically connected with the PFC circuit through the IGBT module, and the driving controller is electrically connected with the IPM module through the IPM driving circuit.
Preferably, a first relay and a starting capacitor are connected between two connecting terminals in the first port, and the first relay is electrically connected with the driving controller.
Preferably, the load type detection circuit comprises three groups of current detection circuits which are respectively electrically connected with different paths in the inverter circuit, and each current detection circuit comprises an amplifier, a first detection resistor, a second detection resistor, a third detection resistor, a fourth detection resistor and a detection capacitor;
one input end of the amplifier is electrically connected with one channel of the inverter circuit through the first detection circuit, the other input end of the amplifier is grounded through the second detection resistor, the output end of the amplifier is electrically connected with the first end of the third detection resistor, the second end of the third detection resistor is electrically connected with the signal input end of the driving controller, the first end of the detection capacitor is electrically connected with the second end of the third detection resistor, and the second end of the detection capacitor is grounded.
The utility model provides a technical scheme that above-mentioned second technical problem adopted does: a central range hood is characterized in that: the motor driving system comprises the motor driving system, a central controller and a second port, wherein the central controller is in communication connection with the driving controller, and the second port is electrically connected with an inverter circuit of the motor driving system;
the range hood further comprises a fan load which can be electrically connected to the first port or an external range hood which can be electrically connected to the second port.
Compared with the prior art, the utility model has the advantages of: the utility model provides a motor drive system can come compatible alternating current-direct current load motor's speed governing control with same set of drive circuit, can guarantee direct current motor speed governing performance, also can promote alternating current motor speed governing performance, so make this motor drive system can use in the load of compatible different grade type motor, if can use in range hood, air conditioner, washing machine for the motor assembly in the electrical apparatus production process is more convenient with electric debugging, has improved production efficiency.
The central range hood applying the motor driving system can also be electrically connected with and drive an external range hood, the speed regulation effect can be realized, and the change of the overall air volume coordination of the central range hood is reduced. Therefore, no matter the fan load connected with the central range hood is an alternating current motor, a direct current motor or an external range hood complete machine of other brands, the speed regulation control can be carried out, and the speed regulation performance requirement and compatibility of the central range hood are greatly improved.
Drawings
Fig. 1 is a schematic diagram of a motor driving system according to an embodiment of the present invention.
Fig. 2 is a circuit diagram of a motor driving system according to an embodiment of the present invention.
Fig. 3 is a circuit diagram of a load type detection circuit according to an embodiment of the present invention.
Fig. 4 is a circuit diagram of an IPM module according to an embodiment of the present invention.
Fig. 5 is a circuit diagram of the ac voltage detecting circuit according to the embodiment of the present invention.
Fig. 6 is a circuit diagram of the dc voltage detecting circuit according to the embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following embodiments.
The motor driving system in the embodiment can be applied to various electric appliances which need to be provided with the motor and need to carry out motor speed regulation, such as a range hood, an air conditioner, a washing machine and the like. In this embodiment, a central range hood is taken as an example, and a motor driving system and a central range hood using the motor driving system are described in detail.
The central range hood comprises a motor driving system, a central controller and a load electrically connected with the motor driving system.
As shown in fig. 1 and fig. 2, the motor driving system includes a driving controller MCU, a rectifying circuit 1, a driving circuit, a load type detecting circuit 2, a first port COM1, a second port COM2, an ac voltage detecting circuit 3, and a dc voltage detecting circuit 4.
The driving controller MCU can be in communication connection with the central controller, and communication modules are arranged on the driving controller MCU and the central controller, so that communication between the driving controller MCU and the central controller is realized.
The rectifier circuit 1 is electrically connected to an external ac power supply, which is an ac commercial power supply, and the rectifier circuit 1 may employ various existing rectifier circuits 1 for rectifying an ac input voltage into a dc voltage.
The driving circuit comprises a PFC circuit 5 electrically connected with the rectifying circuit 1 and the driving controller MCU and an inverter circuit 6 electrically connected with the PFC circuit 5 and the driving controller MCU. The inverter circuit 6 in this embodiment is an IPM module. The driving controller MCU is electrically connected with the PFC circuit 5 through the IGBT module so as to control the PFC circuit 5 to work, and the driving controller MCU is electrically connected with the IPM module through the IPM driving circuit so as to control the IPM module to work. The PFC circuit 5 is used for adjusting direct current voltage, the inverter circuit 6 is used for inverting the direct current voltage into alternating current voltage, and the speed of a direct current motor load or an alternating current motor load can be adjusted through the cooperation of the PFC circuit 5 and the inverter circuit 6.
As shown in fig. 4, the first port COM1 is electrically connected to the inverter circuit 6 for connection to a motor load, and the dc motor and the ac motor may be connected to the first port COM 1. The load type detection circuit 2 is electrically connected with the inverter circuit 6 and the drive controller MCU and is used for detecting whether the motor load connected to the first port COM1 is an ac motor or a dc motor. Be connected with first relay and start-up electric capacity C10 between two connecting terminals in first port COM1, first relay is connected with drive controller MCU electricity and is connected, so when drive controller MCU acquires the load of being connected on first port COM1 and is AC motor, can control switch on first relay's switch K1, so realize with the power supply connection of two terminals of AC motor load.
As shown in fig. 2 and 3, the load type detection circuit 2 in the present embodiment includes three sets of current detection circuits electrically connected to different paths in the inverter circuit 6, respectively, and the current detection circuits include an amplifier IC2, an IC3, an IC4, a first detection resistor R14, an R19, an R24, a second detection resistor R16, an R20, an R25, a third detection resistor R17, an R22, an R27, a fourth detection resistor R15, an R21, an R26, a detection capacitor C4, a C5, and a C6; one input end of the amplifier IC2, the IC3 and the IC4 is electrically connected with one channel of the inverter circuit 6 through a first detection resistor R14, R19 and R24, the other input end of the amplifier IC2, the IC3 and the IC4 is electrically connected with the ground through a second detection resistor R16, R20 and R25, the output end of the amplifier IC2, the IC3 and the IC4 is electrically connected with the first ends of a third detection resistor R17, a third detection resistor R22 and a third detection resistor R27, the second ends of a third detection resistor R17, a third detection resistor R22 and a third detection resistor R27 are electrically connected with the signal input end of the driving controller MCU, the first ends of a detection capacitor C4, a detection capacitor C5 and a detection capacitor C6 are electrically connected with the second ends of a third detection resistor R17, a detection resistor R22 and a detection capacitor C27, and the second ends of a detection capacitor C4, a detection capacitor C5 and a detection capacitor C6 are electrically connected with the ground.
The alternating voltage detection circuit 3 is electrically connected with the input end of the rectification circuit 1 to detect whether the voltage of an external alternating current power supply fluctuates or not, the direct voltage detection circuit 4 is electrically connected with the output end of the PFC circuit 5 to further detect the direct voltage condition output by the output end of the PFC circuit 5, and the alternating voltage detection circuit 3 and the direct voltage detection circuit 4 are respectively electrically connected with the drive controller MCU. The alternating voltage detection circuit 3 and the direct voltage detection circuit 4 transmit the detected conditions of the alternating voltage and the direct voltage to the driving controller MCU in real time, and then the driving controller MCU controls the driving circuit to work according to the obtained conditions of the alternating voltage and the direct voltage, so that the reliable driving of the load is effectively adjusted under the condition of external alternating power supply voltage fluctuation, and the stable operation of load speed regulation is ensured. The speed regulation control of the load adopts a control mode that the PFC circuit 5 is matched with the inverter circuit 6, and when an external alternating current power supply inputs alternating current low voltage, the voltage can be boosted through the PFC circuit 5, so that the voltage of the rear-end inverter circuit 6 is ensured. When the input alternating voltage of the external alternating current power supply is high voltage, the voltage can be regulated through the inverter circuit 6, the load at the rear end is not overvoltage, the load works in a reliable voltage range, and the problem of motor rotating speed fluctuation in an area with unstable voltage of the external alternating current power supply is solved.
As shown in fig. 2 and fig. 5, the ac voltage detection circuit 3 in this embodiment includes a first amplifier IC1, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, a first diode D1, a second diode D2, a first capacitor C1, a second capacitor C2, a third capacitor C3, an eighth capacitor C8, and a ninth capacitor C9.
A first input terminal of the first amplifier IC1 is electrically connected to one terminal of an external ac power source through a third resistor R3 and a first resistor R1 connected in series, wherein a second terminal of the third resistor R3 is electrically connected to a first terminal of the first resistor R1, a second input terminal of the first amplifier IC1 is electrically connected to the other terminal of the external ac power source through a fourth resistor R4 and a second resistor R2 connected in series, wherein a second terminal of the fourth resistor is electrically connected to a first terminal of the second resistor R2, a first terminal of the first resistor R1 is electrically connected to a first terminal of the second resistor R2 through a second capacitor C2, the first terminal of the first resistor R1 is further grounded through a first capacitor C1, and a first terminal of the second resistor R2 is further grounded through a third resistor R3.
An anode of the first diode D1 is connected to a first end of the fourth resistor R4, a cathode of the first diode D1 is electrically connected to a first end of the third resistor R3, an anode of the second diode D2 is electrically connected to a first end of the third resistor R3, and a cathode of the second diode D2 is connected to a first end of the fourth resistor R4.
The first input end of the first amplifier IC1 is further electrically connected to a first end of a fifth resistor R5 and a first end of a sixth resistor R6, respectively, a second end of the fifth resistor R5 is electrically connected to the module power supply end of the ac voltage detection circuit 3, and a second end of the sixth resistor R6 is grounded; the second input end of the first amplifier IC1 is further electrically connected to the driving controller MCU through a seventh resistor R7 and an eighth resistor R8 connected in series, wherein the second end of the seventh resistor R7 is electrically connected to the first end of the eighth resistor R8, the output end of the first amplifier IC1 is electrically connected to the second end of the seventh resistor R7, and the second end of the eighth resistor R8 is grounded through a ninth capacitor C9.
The supply terminal of the first amplifier IC1 is connected to ground through an eighth capacitor C8.
As shown in fig. 2 and fig. 6, the dc voltage detection circuit 4 in this embodiment includes a seventh capacitor C7, a third diode D3, a fourth diode D4, a twenty-eighth resistor R28, a twenty-ninth resistor R29, a thirty-eighth resistor R30, and a thirty-first resistor R31.
A twenty-eighth resistor R28, a twenty-ninth resistor R29, a thirty-third resistor R30 and a thirty-first resistor R31 are connected in series between the output terminal of the PFC circuit 5 and the ground, wherein a first end of the twenty-eighth resistor R28 is electrically connected to the output terminal of the PFC circuit 5, a second end of the twenty-eighth resistor R28 is electrically connected to a first end of the twenty-ninth resistor R29, a second end of the twenty-ninth resistor R29 is electrically connected to a first end of the thirty-third resistor R30, and a second end of the thirty-third resistor R30 is electrically connected to a first end of the thirty-first resistor R31.
The cathode of the third diode D3 is electrically connected to the module power supply terminal of the dc voltage detection circuit 4, the anode of the third diode D3 is electrically connected to the cathode of the fourth diode D4, the anode of the fourth diode D4 is grounded, the second end of the thirty-first resistor R31 is electrically connected to the cathode of the fourth diode D4, and two ends of the seventh capacitor C7 are electrically connected to two electrodes of the fourth diode D4, respectively.
The second port COM2 can expand the application range of the motor drive system, an external alternating current load can be connected to the second port COM2, and the second port COM2 in this embodiment has two connection ends, and each connection end is electrically connected to the drive controller MCU through a second relay and a third relay respectively. When the driving controller MCU detects that the load is not connected to the first port COM1, the switch K2 of the second relay may be controlled, and the switch K3 of the third relay is closed, so as to turn on the electrical connection between the motor driving system and the second port COM2, and thus, when the load is connected to the second port COM2, the driving speed regulation control of the load may be implemented.
For example, the central range hood can be connected with an external range hood through the second port COM2, and the range hood can be a range hood of other brands. The motor driving system can drive the external alternating current load connected to the second port COM2 under the condition that the first port COM1 is not connected with a load, and at the moment, the inverter circuit 6 can be used as an inverter power supply to output a controllable alternating current power supply for driving the external alternating current load, so that the speed regulation effect can be realized, and the change of the coordination of the whole air volume of the central range hood is reduced. Therefore, no matter the first port COM1 is connected with an alternating current motor or a direct current motor, or the second port COM2 is externally connected with an external alternating current load, the speed regulation control can be carried out, and the speed regulation performance requirements and compatibility of similar products of a central oil fume suction system are greatly improved.
The operation of the motor drive system is as follows.
When the driving controller MCU receives a user starting instruction transmitted by the central controller through the communication circuit, the driving controller MCU controls the power supply to the driving circuit. After electrification, the load type detection circuit 2 detects whether a load exists on the first port COM1, specifically, the drive controller MCU controls the three-phase bridge circuit in the IPM circuit to output a fixed pulse width voltage in turn, meanwhile, the load type detection circuit 2 samples the current flowing through the load and transmits the sampled current to the drive controller MCU, the drive controller MCU judges whether the load is connected to the first port COM1 through the sampled load current, and if the load is connected, the type of the motor connected to the first port COM1 is judged.
Specifically, if the load type detection circuit 2 does not detect current, it is determined that no load is connected to the first port COM1, at this time, the drive controller MCU controls the switches K2 and K3 in the second relay and the third relay to be closed, and detects whether an external ac load is connected to the second port COM2, and if it is detected that current flows through the load type detection circuit 2 at this time, it is determined that an external ac load is connected to the second port COM2, and the drive controller MCU controls the drive circuit to operate to perform speed regulation control on the external ac load connected to the second port COM 2. If the load type detection circuit 2 does not detect that a current flows at this time, it is determined that the external ac load is not connected to the second port COM 2. Load anomalies may be reported to the central controller by the drive controller MCU.
Under the premise that the switches K2 and K3 in the second relay and the third relay are turned off, if it is detected that current flows through the first port COM1 and corresponding currents are detected in three groups of current detection circuits in the load type detection circuit 2, and according to the three-phase symmetry characteristic of the direct current motor, if the detected three-phase currents are the same, that is, Iu ═ Iv ═ Iw, it is determined that the load connected to the first port COM1 is the direct current motor, the control chip controls the PFC circuit 5 to work with the inverter circuit 6, so that the IPM circuit outputs a power supply required by the set rotating speed of the direct current motor, and further, the rotating speed regulation control of the direct current motor is realized.
If the detected three-phase current condition is Iu ≠ Iv ≠ IW, it is determined that the load connected to the first port COM1 is an alternating current motor, at this time, the drive controller MCU controls the switch K1 in the first relay to be closed, the inverter circuit 6 forms a single-phase alternating current inverter bridge circuit to supply power to the alternating current motor, and further, the speed regulation drive of the alternating current motor is realized.
When the load is detected to be a direct current motor, the three-phase bridge in the IPM circuit operates, and when the load connected to the first port COM1 is detected to be an alternating current motor or the external alternating current load is detected to be connected to the second port COM2, the IPM circuit is used as an alternating current power supply, that is, the two-phase bridge in the IPM circuit operates.
When the alternating voltage detection circuit 3 detects that the alternating voltage input by the external cigarette lighter fluctuates, the driving controller MCU controls the PFC circuit 5 and the inverter circuit 6 to work cooperatively, so that the three-phase voltage or the single-phase voltage output to the load connected to the first port COM1 is stabilized, thereby ensuring that the load operates at a set rotating speed.
Claims (10)
1. A motor drive system includes
A drive controller;
the rectifying circuit is electrically connected with an external alternating current power supply and is used for rectifying alternating current input voltage into direct current voltage;
the method is characterized in that: also comprises
The driving circuit comprises a PFC circuit electrically connected with the rectifying circuit and the driving controller and an inverter circuit electrically connected with the PFC circuit and the driving controller;
the first port is electrically connected with the inverter circuit and is used for connecting a motor load;
and the load type detection circuit is electrically connected with the inverter circuit and the drive controller and is used for detecting whether the motor load connected to the first port is an alternating current motor or a direct current motor.
2. The motor drive system according to claim 1, characterized in that: the alternating current voltage detection circuit and the direct current voltage detection circuit are electrically connected with the output end of the PFC circuit respectively and are electrically connected with the driving controller.
3. The motor drive system according to claim 2, characterized in that: the alternating voltage detection circuit comprises a first amplifier, a first resistor, a second resistor, a third resistor, a fourth resistor, a fifth resistor, a sixth resistor, a seventh resistor, an eighth resistor, a first diode, a second diode, a first capacitor, a second capacitor, a third capacitor, an eighth capacitor and a ninth capacitor;
the first input end of the first amplifier is electrically connected with one end of an external alternating current power supply through a third resistor and a first resistor which are connected in series, wherein the second end of the third resistor is electrically connected with the first end of the first resistor;
the anode of the first diode is connected with the first end of the fourth resistor, the cathode of the first diode is electrically connected with the first end of the third resistor, the anode of the second diode is electrically connected with the first end of the third resistor, and the cathode of the second diode is connected with the first end of the fourth resistor;
the first input end of the first amplifier is also electrically connected with the first end of a fifth resistor and the first end of a sixth resistor respectively, the second end of the fifth resistor is electrically connected with the module power supply end of the alternating-current voltage detection circuit, and the second end of the sixth resistor is grounded; the second input end of the first amplifier is also electrically connected with the driving controller through a seventh resistor and an eighth resistor which are connected in series, wherein the second end of the seventh resistor is electrically connected with the first end of the eighth resistor, the output end of the first amplifier is electrically connected with the second end of the seventh resistor, and the second end of the eighth resistor is grounded through a ninth capacitor;
and the power supply end of the first amplifier is grounded through an eighth capacitor.
4. The motor drive system according to claim 2, characterized in that: the direct-current voltage detection circuit comprises a seventh capacitor, a third diode, a fourth diode, a twenty-eighth resistor, a twenty-ninth resistor, a thirty-eighth resistor and a thirty-first resistor;
the twenty-eighth resistor, the twenty-ninth resistor, the thirty-fifth resistor and the thirty-fifth resistor are connected between the output end of the PFC circuit and the ground wire in series, wherein the first end of the twenty-eighth resistor is electrically connected with the output end of the PFC circuit, the second end of the twenty-eighth resistor is electrically connected with the first end of the twenty-ninth resistor, the second end of the twenty-ninth resistor is electrically connected with the first end of the thirty-fifth resistor, and the second end of the thirty-fifth resistor is electrically connected with the first end of the thirty-fifth resistor;
the negative electrode of the third diode is electrically connected with the module power supply end of the direct-current voltage detection circuit, the positive electrode of the third diode is electrically connected with the negative electrode of the fourth diode, the positive electrode of the fourth diode is grounded, the second end of the thirty-first resistor is electrically connected with the negative electrode of the fourth diode, and two ends of the seventh capacitor are respectively electrically connected with two electrodes of the fourth diode.
5. The motor drive system according to claim 1, characterized in that: the driving circuit further comprises a second port used for being connected with an external alternating current load, the second port is provided with two connecting ends, and each connecting end is electrically connected with the driving controller through a second relay and a third relay respectively.
6. A motor drive system according to any one of claims 1 to 5, wherein: the inverter circuit is an IPM module.
7. The motor drive system according to claim 6, characterized in that: the driving controller is electrically connected with the PFC circuit through the IGBT module, and the driving controller is electrically connected with the IPM module through the IPM driving circuit.
8. A motor drive system according to any one of claims 1 to 5, wherein: and a first relay and a starting capacitor are connected between two connecting terminals in the first port, and the first relay is electrically connected with the driving controller.
9. A motor drive system according to any one of claims 1 to 5, wherein: the load type detection circuit comprises three groups of current detection circuits which are respectively and electrically connected with different paths in the inverter circuit, and each current detection circuit comprises an amplifier, a first detection resistor, a second detection resistor, a third detection resistor, a fourth detection resistor and a detection capacitor;
one input end of the amplifier is electrically connected with one channel of the inverter circuit through the first detection circuit, the other input end of the amplifier is grounded through the second detection resistor, the output end of the amplifier is electrically connected with the first end of the third detection resistor, the second end of the third detection resistor is electrically connected with the signal input end of the driving controller, the first end of the detection capacitor is electrically connected with the second end of the third detection resistor, and the second end of the detection capacitor is grounded.
10. A central range hood is characterized in that: the motor driving system comprises a motor driving system as claimed in any one of claims 1 to 9, a central controller and a second port, wherein the central controller is in communication connection with the driving controller, and the second port is electrically connected with an inverter circuit of the motor driving system;
the range hood further comprises a fan load which can be electrically connected to the first port or an external range hood which can be electrically connected to the second port.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021821175.6U CN213783174U (en) | 2020-08-27 | 2020-08-27 | Motor driving system and central range hood applying same |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202021821175.6U CN213783174U (en) | 2020-08-27 | 2020-08-27 | Motor driving system and central range hood applying same |
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| CN213783174U true CN213783174U (en) | 2021-07-23 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023009201A1 (en) * | 2021-07-28 | 2023-02-02 | Apple Inc. | Auto-configurable energy storage system |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023009201A1 (en) * | 2021-07-28 | 2023-02-02 | Apple Inc. | Auto-configurable energy storage system |
| US11955908B2 (en) | 2021-07-28 | 2024-04-09 | Apple Inc. | Auto-configurable energy storage system |
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