CN220254384U - Speed regulating device of AC motor and fan - Google Patents

Abstract

The utility model provides an AC motor speed regulating device and a fan. The AC motor speed regulating device comprises: the device comprises a current detection module, a zero crossing detection module, a main control module and a tangential wave speed regulation module; the control end of the tangential wave speed regulating module is connected with the main control module, the first input end and the second input end of the tangential wave speed regulating module are respectively used for being correspondingly connected with the zero line and the fire wire of the alternating current power supply, and the first output end and the second output end of the tangential wave speed regulating module are respectively used for being correspondingly connected with the zero line and the fire wire of the alternating current motor; the input end of the current detection module is connected with the second output end of the tangential wave speed regulation module, and the output end of the current detection module is connected with the main control module; the input end of the zero-crossing detection module is connected with the first input end of the tangential wave speed regulation module, and the output end of the zero-crossing detection module is connected with the main control module. According to the utility model, the main control module adjusts the tangential angle according to the current of the AC motor detected by the current detection module, so that the device is compatible with various AC motors, and the adaptability of the device is improved.

Description

AC motor speed regulating device and fan

Technical field

The utility model relates to the field of motor technology, and in particular to an AC motor speed regulating device and a fan.

Background technique

Household electric fans are usually equipped with a speed regulating device, which is used to adjust the speed of the AC motor in the electric fan to adjust the wind speed. Since the types of electric fans are different, the starting capacitors of the internal AC motors are also different, and the sustaining current is also different.

In the existing technology, the minimum output current of the speed regulating device is usually fixed, so the speed regulating devices corresponding to different AC motors are also different, and the compatibility of the speed regulating device is poor.

Utility model content

Embodiments of the present utility model provide an AC motor speed regulating device and a fan to solve the problem of poor compatibility of AC motor speed regulating devices in the prior art.

In the first aspect, embodiments of the present utility model provide an AC motor speed regulating device, including: a current detection module, a zero-crossing detection module, a main control module and a wave-cut speed regulating module;

The control end of the wave-cut speed regulation module is connected to the main control module. The first input end and the second input end of the wave-cut speed regulation module are respectively used to connect to the neutral line and the live wire of the AC power supply. The third input end of the wave-cut speed regulation module is The first output terminal and the second output terminal are respectively used for corresponding connection with the neutral wire and live wire of the AC motor;

The input end of the current detection module is connected to the second output end of the wave cutting speed regulation module, and the output end of the current detection module is connected to the main control module for detecting the driving current of the AC motor and sending the detected current value to the main control module. control module;

The input end of the zero-crossing detection module is connected to the first input end of the wave-cut speed regulation module, and the output end of the zero-crossing detection module is connected to the main control module for detecting the AC zero-crossing point and sending the detected zero-crossing point information to Main control module.

Optionally, the wave cutting speed regulation module includes: PWM drive unit, first switch unit and second switch unit;

The input end of the PWM drive unit is connected to the control end of the wave cutting speed regulation module, and the output end of the PWM drive unit is connected to the control end of the first switch unit and the control end of the second switch unit respectively;

The first end of the first switch unit is connected to the second input end of the wave-cut speed regulation module, the second end of the first switch unit is connected to the second end of the second switch unit, and the first end of the second switch unit is connected to the cut-wave speed regulation module. Connect the second output end of the wave speed regulation module;

The first input end of the wave cutting speed regulation module is connected to the first output end of the wave cutting speed regulation module.

Optionally, the PWM drive unit includes: a drive chip, a first zener diode, a first capacitor, a first resistor and a second resistor;

The positive input terminal of the driver chip is connected to the input terminal of the PWM driver unit through the first resistor, the power terminal of the driver chip is connected to the DC power terminal, the negative input terminal of the driver chip is grounded, and the output terminal of the driver chip is connected to the third resistor through the second resistor. The cathode of a Zener diode, the first terminal of the first capacitor and the output terminal of the PWM drive unit are connected;

The anode of the first Zener diode and the second terminal of the first capacitor are both grounded.

Optionally, the AC motor speed control device also includes: ACDC module;

The first input terminal and the second input terminal of the ACDC module are respectively connected to the first input terminal and the second input terminal of the wave cutting speed regulation module, and the output terminal of the ACDC module is connected to the DC power supply terminal.

Optionally, the first switching unit includes: a first field effect transistor; the second switching unit includes: a second field effect transistor;

The drain of the first field effect transistor is connected to the first end of the first switch unit, the source of the first field effect transistor is connected to the second end of the first switch unit, and the gate of the first field effect transistor is connected to the first switch. The control end connection of the unit;

The drain of the second field effect transistor is connected to the first end of the second switch unit, the source of the second field effect transistor is connected to the second end of the second switch unit, and the gate of the second field effect transistor is connected to the second switch. The control end connection of the unit;

The source of the first field effect transistor and the source of the second field effect transistor are both grounded.

Optionally, the current detection module and the zero-crossing detection module have the same circuit structure.

Optionally, the current detection module includes: a second Zener diode, a second capacitor, a third resistor and a fourth resistor;

The first end of the third resistor is connected to the input end of the current detection module, and the second end of the third resistor is respectively connected to the first end of the fourth resistor, the first end of the second capacitor, the cathode of the second Zener diode and the current The output terminal connection of the detection module;

The second terminal of the fourth resistor, the second terminal of the second capacitor and the anode of the second Zener diode are all grounded.

Optional, the main control module includes: microcontroller.

Optionally, the AC motor speed control device also includes: filter module;

The first input terminal and the second input terminal of the filter module are respectively used to connect to the neutral line and the live wire of the AC power supply. The first output terminal and the second output terminal of the filter module are respectively connected to the first input terminal of the wave cutting speed regulation module. Connect correspondingly to the second input terminal.

In a second aspect, an embodiment of the present utility model provides a fan, including: an AC motor and the AC motor speed regulating device provided in the first aspect of the embodiment of the utility model;

AC motor speed regulating device is used to drive AC motor.

The embodiment of the present utility model provides an AC motor speed regulating device and a fan. The device includes: a current detection module, a zero-crossing detection module, a main control module and a wave-cutting speed regulating module; the control end and the main control module of the wave-cutting speed regulating module Module connection, the first input end and the second input end of the wave cutting speed regulation module are respectively used to connect to the neutral line and live wire of the AC power supply, and the first output end and the second output end of the wave cutting speed regulation module are respectively used to connect Correspondingly connected to the neutral line and live wire of the AC motor; the input end of the current detection module is connected to the second output end of the wave-cut speed regulation module, and the output end of the current detection module is connected to the main control module to detect the driving current of the AC motor. , and send the detected current value to the main control module; the input end of the zero-crossing detection module is connected to the first input end of the wave-cut speed regulation module, and the output end of the zero-crossing detection module is connected to the main control module for detection. Communicate zero-crossing points and send the detected zero-crossing point information to the main control module. In the embodiment of the present invention, a current detection module is provided. The current detection module detects the driving current of the AC motor and sends it to the main control module. When the main control module detects that the driving current of the AC motor disappears, it adaptively increases the wave cutting angle, so that the AC The motor speed regulating device is compatible with various AC motors, effectively improving the adaptability of the device.

Description of drawings

In order to explain the technical solutions in the embodiments of the present invention more clearly, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the purpose of the present utility model. For some embodiments of the new type, those of ordinary skill in the art can also obtain other drawings based on these drawings without exerting any creative effort.

Figure 1 is a schematic circuit structure diagram of an AC motor speed regulating device provided by an embodiment of the present invention;

Figure 2 is a schematic circuit structure diagram of a wave cutting speed regulation module provided by an embodiment of the present invention;

Figure 3 is a partial circuit schematic diagram of an AC motor speed regulating device provided by an embodiment of the present utility model;

Figure 4 is a wave cutting effect diagram of the AC motor speed regulating device provided by the embodiment of the present utility model;

Figure 5 is a schematic circuit structure diagram of yet another AC motor speed regulating device provided by an embodiment of the present invention;

Figure 6 is a schematic circuit diagram of a current detection module provided by an embodiment of the present invention;

Figure 7 is a schematic circuit diagram of a main control module provided by an embodiment of the present invention.

Detailed ways

In order to enable those in the technical field to better understand this solution, the technical solutions in the embodiments of this solution will be clearly described below in conjunction with the accompanying drawings in the embodiments of this solution. Obviously, the described embodiments are part of this solution embodiments, not all embodiments. Based on the embodiments in this solution, all other embodiments obtained by those of ordinary skill in the art without creative efforts should fall within the scope of protection of this solution.

The term "including" and any other variations in the description and claims of this solution and the above-mentioned drawings mean "including but not limited to", which is intended to cover non-exclusive inclusion and is not limited to the examples listed in the text. In addition, terms such as "first" and "second" are used to distinguish between different objects and are not used to describe a specific order.

The implementation of the present utility model is described in detail below with reference to the specific drawings:

Figure 1 is a schematic structural diagram of an AC motor speed regulating device provided by an embodiment of the present invention.

Referring to Figure 1, the AC motor speed regulation device includes: current detection module 11, zero-crossing detection module 12, main control module 13 and wave cutting speed regulation module 14;

The control end of the wave-cut speed regulation module 14 is connected to the main control module 13. The first input end and the second input end of the wave-cut speed regulation module 14 are respectively used to connect to the neutral line and the live wire of the AC power supply. The wave-cut speed regulation The first output end and the second output end of the module 14 are respectively used to be connected to the neutral line and the live line of the AC motor;

The input end of the current detection module 11 is connected to the second output end of the wave cutting speed regulation module 14, and the output end of the current detection module 11 is connected to the main control module 13 for detecting the driving current of the AC motor and detecting the detected current. The value is sent to the main control module 13;

The input end of the zero-crossing detection module 12 is connected to the first input end of the wave-cut speed regulation module 14, and the output end of the zero-crossing detection module 12 is connected to the main control module 13 for detecting the AC zero-crossing point and transmitting the detected crossing point. The zero point information is sent to the main control module 13.

In the embodiment of the present invention, the current detection module 11 detects the AC zero-crossing point, and the main control module 13 outputs the corresponding PWM control signal PWM1 (adjustable frequency, adjustable wave-cutting angle) according to the zero-crossing point information to the wave-cutting speed regulation module 14. Cut the wave and reduce the voltage, output electric energy to the AC motor, and control the speed of the AC motor. For example, the main control module 13 receives the user signal and outputs the PWM control signal PWM1 to the wave cutting speed regulation module 14 according to the user signal. By adjusting the PWM control signal PWM1, the wave cutting frequency and wave cutting angle can be adjusted, thereby achieving speed regulation.

At the same time, the embodiment of the present invention is also provided with a current detection module 11. The current detection module 11 detects the driving current of the AC motor. When it is detected that the driving current of the AC motor disappears, it means that the cutting angle is too small at this time and is smaller than the AC motor. Maintaining the current, the main control module 13 controls to increase the cutting angle and restart the AC motor. At the same time, the main control module 13 can record the critical shear frequency and shear angle (different AC motors correspond to different critical shear angles), and meet the minimum speed conditions during subsequent operations, so that when the speed control device is connected to different types of AC motors , various AC motors can rotate reliably in low-speed gears, which effectively improves the adaptability of the speed control device, making the speed control device compatible with various AC motors and having a wider application range.

For example, after being powered on for the first time, the main control module 13 outputs a standard PWM control signal PWM1. If the current detection module 11 detects the driving current, it means that the AC motor can operate normally. Further, change the shear frequency and angle, slowly reduce the drive current until the drive current disappears, record the critical current and the shear frequency and shear angle at this time, and realize the self-learning of the lowest speed of five stepless speed regulation. There is no need to readjust when using again. The main control module 13 directly ensures that the wave cutting frequency and wave cutting angle meet the minimum speed conditions based on the last record, ensuring the normal operation of the AC motor.

In a possible implementation, referring to Figure 2, the wave cutting speed regulation module 14 may include: a PWM drive unit 141, a first switch unit 142 and a second switch unit 143;

The input end of the PWM drive unit 141 is connected to the control end of the wave cutting speed regulation module 14, and the output end of the PWM drive unit 141 is connected to the control end of the first switch unit 142 and the control end of the second switch unit 143 respectively;

The first end of the first switch unit 142 is connected to the second input end of the wave cutting speed regulation module 14 . The second end of the first switch unit 142 is connected to the second end of the second switch unit 143 . The first end is connected to the second output end of the wave cutting speed regulation module 14;

The first input end of the wave cutting speed regulation module 14 is connected to the first output end of the wave cutting speed regulation module 14 .

In the embodiment of the present invention, a double-switch wave cutting mode is adopted. The PWM drive unit 141 receives the PWM control signal sent by the main control module 13 and controls the first switch unit 142 and the second switch unit 143 to be turned on or off at the same time, thereby realizing switching. Wave.

In a possible implementation, referring to FIG. 3 , the PWM driving unit 141 may include: a driving chip U1, a first Zener diode D1, a first capacitor C1, a first resistor R1 and a second resistor R2;

The positive input terminal (IN+) of the driver chip U1 is connected to the input terminal of the PWM drive unit 141 through the first resistor R1, the power terminal (VDD) of the driver chip U1 is connected to the DC power terminal VCC, and the negative input terminal (IN) of the driver chip U1 -) grounded, the output terminal (OUT) of the driver chip U1 is connected to the cathode of the first Zener diode D1, the first terminal of the first capacitor C1 and the output terminal of the PWM drive unit 141 through the second resistor R2 respectively;

The anode of the first Zener diode D1 and the second terminal of the first capacitor C1 are both grounded.

In the embodiment of the present invention, the driver chip U1 is used to drive the first switch unit 142 and the second switch unit 143 to operate simultaneously. The first zener diode D1 is used for voltage stabilization, and the first capacitor C1 is used for filtering to provide power for the two switch units. Stable driving signal to avoid malfunction of the two switch units.

Figure 4 shows the wave cutting effect diagram using the above-mentioned wave cutting speed regulation module circuit. It can be seen from the figure that the above circuit can be used to achieve high-frequency AC wave cutting, thereby achieving speed regulation of the AC motor.

In a possible implementation, referring to Figure 5, the AC motor speed regulating device may also include: ACDC module 15;

The first input terminal and the second input terminal of the ACDC module 15 are respectively connected to the first input terminal and the second input terminal of the wave cutting speed regulation module 14. The output terminal of the ACDC module 15 is connected to the DC power supply terminal VCC.

In the embodiment of the present invention, an ACDC module 15 is provided for converting alternating current into direct current to provide direct current for other modules.

For example, the ACDC module 15 can also be connected to the main control module 13 to provide direct current to the main control module 13 .

Refer to Figure 3 for the specific circuit structure of the ACDC module 15, which will not be described again here.

In a possible implementation, referring to FIG. 3 , the first switching unit 142 may include: a first field effect transistor Q1; the second switching unit 143 includes: a second field effect transistor Q2;

The drain of the first field effect transistor Q1 is connected to the first terminal of the first switching unit 142, the source of the first field effect transistor Q1 is connected to the second terminal of the first switching unit 142, and the gate of the first field effect transistor Q1 The pole is connected to the control end of the first switch unit 142;

The drain of the second field effect transistor Q2 is connected to the first end of the second switching unit 143, the source of the second field effect transistor Q2 is connected to the second end of the second switching unit 143, and the gate of the second field effect transistor Q2 The pole is connected to the control end of the second switch unit 143;

The source of the first field effect transistor Q1 and the source of the second field effect transistor Q2 are both grounded.

The embodiment of the present invention uses two field effect transistors (the first field effect transistor Q1 and the second field effect transistor Q2) to form a switch unit. In order to provide a suitable bias voltage, the sources of the two field effect transistors are both grounded, and the gates are loaded with drive signals to obtain appropriate deviations on the field effect tubes and control the conduction or disconnection of the field effect tubes to achieve wave cutting.

In a possible implementation, the circuit structures of the current detection module 11 and the zero-crossing detection module 12 may be the same.

The current detection module 11 and the zero-crossing detection module 12 are both used to detect current, and the circuit structures may be the same.

In a possible implementation, referring to FIG. 6 , the current detection module 11 may include: a second Zener diode D2, a second capacitor C2, a third resistor R3 and a fourth resistor R4;

The first end of the third resistor R3 is connected to the input end of the current detection module 11, and the second end of the third resistor R3 is connected to the first end of the fourth resistor R4, the first end of the second capacitor C2, and the second voltage stabilizing module respectively. The cathode of diode D2 is connected to the output end of the current detection module 11;

The second terminal of the fourth resistor R4, the second terminal of the second capacitor C2 and the anode of the second Zener diode D2 are all grounded.

The third resistor R3 and the fourth resistor R4 divide the voltage to charge the second capacitor C2 to realize current detection. Among them, the second zener diode D2 is used for voltage stabilization to prevent excessive voltage from damaging the back-end chip.

In a possible implementation, referring to FIG. 7 , the main control module 13 may include: a microcontroller.

Specifically, in the embodiment of the present invention, the main control module 13 can be implemented by a single-chip microcomputer. The specific circuit structure is shown in Figure 7 and will not be described again here.

In a possible implementation, referring to Figure 5, the AC motor speed regulating device may also include: a filter module 16;

The first input terminal and the second input terminal of the filter module 16 are respectively used to be connected to the neutral line and the live wire of the AC power supply. The first output terminal and the second output terminal of the filter module 16 are respectively connected to the third terminal of the wave cutting speed regulation module 14. The first input terminal and the second input terminal are connected correspondingly.

In order to improve the stability of the AC power supply, in the embodiment of the present invention, a filter module 16 is provided at the input end of the AC power supply to improve the quality of the AC power supply.

Corresponding to the above embodiments, embodiments of the present invention also provide a fan, including: an AC motor and the AC motor speed regulating device provided in the above embodiments. AC motor speed regulating device is used to drive AC motor.

This fan has the advantages of the above-mentioned AC motor speed regulating device, which will not be described again here.

The above embodiments are only used to illustrate the technical solution of the present invention, but not to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still implement the foregoing implementations. The technical solutions described in the examples are modified, or some of the technical features are equivalently replaced; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of each embodiment of the present invention.

Claims (10)

1. An AC motor speed regulating device, characterized by comprising: a current detection module, a zero-crossing detection module, a main control module and a wave-cut speed regulating module; The control end of the wave cutting speed regulation module is connected to the main control module, and the first input end and the second input end of the wave cutting speed regulation module are respectively used to connect to the neutral line and the live line of the AC power supply, so The first output end and the second output end of the wave cutting speed regulation module are respectively used to be connected to the neutral line and the live line of the AC motor; The input end of the current detection module is connected to the second output end of the wave cutting speed regulation module, and the output end of the current detection module is connected to the main control module for detecting the driving current of the AC motor, And send the detected current value to the main control module; The input end of the zero-crossing detection module is connected to the first input end of the wave-cut speed regulation module, and the output end of the zero-crossing detection module is connected to the main control module for detecting the AC zero-crossing point, and The detected zero-crossing point information is sent to the main control module. 2. The AC motor speed regulating device according to claim 1, wherein the wave cutting speed regulating module includes: a PWM drive unit, a first switch unit and a second switch unit; The input end of the PWM drive unit is connected to the control end of the wave cutting speed regulation module, and the output end of the PWM drive unit is respectively connected to the control end of the first switch unit and the control end of the second switch unit. connect; The first end of the first switch unit is connected to the second input end of the wave cutting speed regulation module, and the second end of the first switch unit is connected to the second end of the second switch unit. The first end of the second switch unit is connected to the second output end of the wave cutting speed regulation module; The first input end of the wave cutting speed regulation module is connected to the first output end of the wave cutting speed regulation module. 3. The AC motor speed regulating device according to claim 2, wherein the PWM drive unit includes: a drive chip, a first Zener diode, a first capacitor, a first resistor and a second resistor; The positive input terminal of the driver chip is connected to the input terminal of the PWM drive unit through the first resistor, the power terminal of the driver chip is connected to the DC power terminal, and the negative input terminal of the driver chip is grounded. The output terminal of the driver chip is respectively connected to the cathode of the first Zener diode, the first terminal of the first capacitor and the output terminal of the PWM drive unit through the second resistor; The anode of the first Zener diode and the second terminal of the first capacitor are both grounded. 4. The AC motor speed regulating device according to claim 3, further comprising: an ACDC module; The first input terminal and the second input terminal of the ACDC module are respectively connected to the first input terminal and the second input terminal of the wave cutting speed regulation module, and the output terminal of the ACDC module is connected to the DC power supply terminal. . 5. The AC motor speed regulating device according to claim 2, wherein the first switch unit includes: a first field effect transistor; the second switch unit includes: a second field effect transistor; The drain of the first field effect transistor is connected to the first end of the first switching unit, and the source of the first field effect transistor is connected to the second end of the first switching unit. The gate of the field effect transistor is connected to the control terminal of the first switching unit; The drain of the second field effect transistor is connected to the first end of the second switching unit, the source of the second field effect transistor is connected to the second end of the second switching unit, and the second The gate of the field effect transistor is connected to the control terminal of the second switch unit; The source of the first field effect transistor and the source of the second field effect transistor are both grounded. 6. The AC motor speed regulating device according to any one of claims 1 to 5, characterized in that the current detection module and the zero-crossing detection module have the same circuit structure. 7. The AC motor speed regulating device according to claim 6, wherein the current detection module includes: a second Zener diode, a second capacitor, a third resistor and a fourth resistor; The first end of the third resistor is connected to the input end of the current detection module, and the second end of the third resistor is connected to the first end of the fourth resistor and the first end of the second capacitor respectively. , the cathode of the second Zener diode is connected to the output end of the current detection module; The second terminal of the fourth resistor, the second terminal of the second capacitor and the anode of the second Zener diode are all grounded. 8. The AC motor speed regulating device according to any one of claims 1 to 5, characterized in that the main control module includes: a single chip microcomputer. 9. The AC motor speed regulating device according to any one of claims 1 to 5, further comprising: a filter module; The first input end and the second input end of the filter module are respectively used to be connected to the neutral line and the live line of the AC power supply, and the first output end and the second output end of the filter module are respectively connected to the wave cutting The first input terminal and the second input terminal of the speed regulating module are connected correspondingly. 10. A fan, characterized in that it includes: an AC motor and the AC motor speed regulating device according to any one of claims 1 to 9; The AC motor speed regulating device is used to drive the AC motor.