CN205647333U - Motor speed control device and household appliances - Google Patents

Abstract

The utility model discloses a motor speed adjusting device and domestic appliance, wherein, motor speed adjusting device includes: the first switch module is connected with the motor in parallel and comprises a first charging module, a first diode, a first voltage stabilizing module and a first switch tube which are connected in series; the second switch module is connected with the motor in series and comprises a second charging module, a second diode, a second voltage stabilizing module and a second switch tube which are connected in series; a first driver driving the first switch module; a second driver driving the second switch module; and the control module is used for controlling the first driver through the first PWM signal and controlling the second driver through the second PWM signal, wherein the first PWM signal and the second PWM signal are self-locked with each other. The utility model discloses motor speed adjusting device can improve the reliability of control speed governing, simplifies the direct current supply circuit among the motor speed governing circuit, and reduce cost just reduces the encapsulation volume that corresponds.

Description

Motor speed control device and household appliances

technical field

The utility model relates to the field of motor control, in particular to a motor speed regulating device and a household appliance.

Background technique

In the related art, as shown in FIG. 1 , modulation is performed through a "single-phase alternating current switching circuit" PWM (Pulse Width Modulation, pulse width modulation). Specifically, the voltage at both ends of the motor is turned on and off at high speed, so as to adjust the average voltage at both ends of the motor to achieve the purpose of speed regulation. When the "motor inductive current discharge circuit" is a switch circuit, Figure 1 can be simplified to Figure 2. As shown in Figure 2, the switching dead time between K1 and K2 (ie: the time from K1 off to K2 on and the time from K2 off to K1 on) is controlled according to the voltage generated when K2 is switched. The dead time It is uncontrollable, and is greatly affected by the time characteristic difference of K1 and K2 devices, which may cause temporary short circuit of K1 and K2, cause K1 and K2 to rise in temperature, or even burn out; and it needs a separate DC power supply circuit, and the cost High, the circuit is complex, and the packaging volume is difficult to miniaturize.

Utility model content

The utility model aims to solve one of the technical problems in the related art at least to a certain extent. For this reason, the first purpose of the utility model is to propose a motor speed regulating device. The motor speed regulating device can improve the reliability of controlling the speed regulation, simplify the DC power supply circuit in the motor speed regulating circuit, reduce the cost, and reduce the packaging volume.

The second purpose of the utility model is to provide a household appliance.

In order to achieve the above purpose, the first aspect of the utility model proposes a motor speed control device, including: a first switch module connected in parallel with the motor, wherein the first switch module includes a first charging module, a first diode , a first voltage stabilizing module and a first switching tube, the first charging module, the first diode, the first voltage stabilizing module and the first switching tube are connected in series; The second switch module, wherein the second switch module includes a second charging module, a second diode, a second voltage stabilizing module, and a second switching tube, the second charging module, the second diode , the second voltage stabilizing module and the second switching tube are connected in series; the first driver driving the first switching module; the second driver driving the second switching module; a control module, the control module uses The first driver is controlled by a first PWM (PulseWidth Modulation, pulse width modulation) signal, and the second driver is controlled by a second PWM signal, wherein the first PWM signal and the second PWM signal are mutually Self-locking.

According to the motor speed regulating device of the present utility model, the first charging module, the first diode, the first voltage stabilizing module in the first switch module, and the second charging module, the second second voltage stabilizing module in the second voltage stabilizing module The pole tube and the second voltage stabilizing module maintain the stability of the power supply voltage, thereby providing a stable voltage for the control module, thereby improving the reliability of the motor speed regulation, and the device does not need to be provided with a separate DC power supply circuit for power supply, and the cost is low. The circuit complexity is low and the package volume is small.

In addition, according to the utility model, the above-mentioned motor speed control device can also have the following additional technical features:

In some examples, the first charging module includes: a first resistor, one end of the first resistor is connected to the first end of the first switch tube, and the other end of the first resistor is connected to the first The anodes of the diodes are connected; the first capacitor is connected in parallel with the first resistor.

In some examples, the first voltage stabilizing module includes: a first voltage stabilizing tube, the cathode of the first voltage stabilizing tube is respectively connected to the cathode of the first diode and the first power supply, and the first voltage stabilizing tube The anode of the voltage regulator tube is connected to the second end of the first switch tube, and forms a first node between the first voltage regulator tube and the first switch tube; the second capacitor, the second capacitor connected in parallel with the first regulator tube.

In some examples, the first terminal of the first driver is connected to the first PWM signal terminal of the control module, the second terminal of the first driver module is grounded through a second resistor, and the second terminal of the first driver is The three terminals are connected to the first power supply through a third resistor, the fourth terminal of the first driver is connected to the third terminal of the first switch tube, and is between the first driver and the first switch tube Form the second node.

In some examples, the first driver is a galvanic coupler or an equivalent isolation transformer.

In some examples, the motor speed regulating device further includes: a fourth resistor connected between the first node and the second node.

In some examples, the second charging module includes: a fifth resistor, one end of the fifth resistor is connected to the first end of the second switch tube, and the other end of the fifth resistor is connected to the second The anodes of the diodes are connected; the third capacitor is connected in parallel with the fifth resistor.

In some examples, the second voltage stabilizing module includes: a second voltage stabilizing tube, the cathode of the second voltage stabilizing tube is respectively connected to the cathode of the second diode and the second power supply, the second voltage stabilizing tube The anode of the Zener tube is connected to the third terminal of the second switching tube through a sixth resistor, and a third node is formed between the second Zener tube and the sixth resistor; the fourth capacitor, the The fourth capacitor is connected in parallel with the second voltage regulator tube.

In some examples, the first end of the second driver is connected to the second PWM signal end of the control module through a seventh resistor, the second end of the second driver is connected to the second power supply through an eighth resistor, The third end of the second driver is connected to the third end of the second switch transistor, wherein the second end of the second switch transistor is grounded.

In some examples, the first capacitor and the third capacitor are polyester capacitors or metal film capacitors.

In some examples, the second capacitor and the fourth capacitor are electrolytic capacitors.

In order to achieve the above purpose, the second aspect of the utility model proposes a household appliance, including: a motor and the above-mentioned motor speed regulating device of the utility model. The speed control system of the household appliance has high reliability, and the motor speed control device therein does not need to be separately provided with a direct current power supply circuit, the cost is low, the circuit is simple, and the packaging volume is small.

Additional aspects and advantages of the present invention will be set forth in part in the description which follows, and part will be apparent from the description which follows, or can be learned by practice of the present invention.

Description of drawings

The above and/or additional aspects and advantages of the present utility model will become apparent and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

Fig. 1 is the schematic diagram of motor speed regulation method in the related art;

Fig. 2 is a schematic diagram of the motor speed regulation method in the related art;

Fig. 3 is a schematic structural view of a motor speed regulating device according to an embodiment of the present invention; and

Fig. 4 is a schematic diagram of a PWM signal output by a control module according to an embodiment of the present invention.

detailed description

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention, but should not be construed as limiting the present invention.

The motor speed control device and the household appliance according to the embodiment of the utility model are described below with reference to the accompanying drawings.

Fig. 3 is a schematic structural diagram of a motor speed regulating device according to an embodiment of the present invention. As shown in FIG. 3 , the motor speed regulating device includes: a first switch module 110 , a second switch module 120 , a first driver 130 , a second driver 140 and a control module 150 .

Wherein, the first switch module 110 is connected in parallel with the motor. Wherein, as shown in FIG. 3 , the first switch module 110 includes a first charging module 111, a first diode D1, a first voltage stabilizing module 112 and a first switching tube K1, the first charging module 110, the first diode The tube D1, the first voltage stabilizing module 112 and the first switching tube K1 are connected in series.

Specifically, the first charging module 11 includes a first resistor R1 and a first capacitor C1, wherein one end of the first resistor R1 is connected to the first end of the first switching tube K1, and the other end of the first resistor R1 is connected to the first two The anode of the pole tube D1 is connected, and the first capacitor C1 is connected in parallel with the first resistor R1.

The first voltage stabilizing module 112 includes a first voltage stabilizing tube ZD1 and a second capacitor C2, wherein the cathode of the first voltage stabilizing tube ZD1 is respectively connected to the cathode of the first diode D1 and the first power supply VCC1, and the first voltage stabilizing The anode of the tube ZD1 is connected to the second end of the first switch tube K1, and forms a first node between the first voltage regulator tube ZD1 and the first switch tube K1, and the second capacitor C2 is connected in parallel with the first voltage regulator tube ZD1 .

The second switch module 120 is connected in series with the motor. Wherein, as shown in FIG. 3 , the second switch module 120 includes a second charging module 121, a second diode D2, a second voltage stabilizing module 122 and a second switching tube K2, the second charging module 121, the second diode The tube D2, the second voltage stabilizing module 122 and the second switching tube K2 are connected in series.

Specifically, the second charging module 122 includes a fifth resistor R5 and a third capacitor C3, wherein one end of the fifth resistor R5 is connected to the first end of the second switching tube K2, and the other end of the fifth resistor R5 is connected to the second two The anode of the pole tube D2 is connected, and the third capacitor C3 is connected in parallel with the fifth resistor R5.

The second voltage stabilizing module 122 includes a second voltage stabilizing tube ZD2 and a fourth capacitor C4, wherein the cathode of the second voltage stabilizing tube ZD2 is connected to the cathode of the second diode D2 and the second power supply VCC2 respectively, and the second voltage stabilizing tube ZD2 The anode of the tube ZD2 is connected to the third end of the second switching tube K2 through the sixth resistor R6, and forms a third node between the second voltage regulator tube ZD2 and the sixth resistor R6, and the fourth capacitor C4 is connected to the second voltage regulator Tube ZD2 is connected in parallel.

Preferably, in an embodiment of the present invention, the first capacitor C1 and the third capacitor C3 may be polyester capacitors or metal film capacitors, and the second capacitor C2 and fourth capacitor C4 may be electrolytic capacitors.

The first driver 130 is used to drive the first switch module 110 .

Specifically, as shown in FIG. 3 , the first terminal of the first driver 130 is connected to the first PWM signal terminal of the control module 150, the second terminal of the first driver module 130 is grounded through the second resistor R2, and the first terminal of the first driver 130 The third terminal is connected to the first power supply VCC1 through the third resistor R3, and the fourth terminal of the first driver 130 is connected to the third terminal of the first switching tube K1, and forms a circuit between the first driver 130 and the first switching tube K1. second node.

In an embodiment of the present utility model, the first driver 130 may be an electrical coupler or an equivalent isolation transformer, which has good electrical insulation capability and anti-interference capability.

The second driver 140 is used to drive the second switch module 120 .

Specifically, as shown in FIG. 3, the first end of the second driver 140 is connected to the second PWM signal end of the control module 150 through the seventh resistor R7, and the second end of the second driver 140 is connected to the second PWM signal end through the eighth resistor R8. The power supply VCC2 is connected, and the third terminal of the second driver 140 is connected to the third terminal of the second switching transistor K2, wherein the second terminal of the second switching transistor K2 is grounded.

In an embodiment of the present invention, the second driver 140 may be a common triode, such as a triode 8550 or the like.

Preferably, in an embodiment of the present invention, the first switch tube K1 and the second switch tube K2 may be MOS (Metal-Oxid-Semiconductor, metal-oxide-semiconductor) tubes.

Further, the motor speed regulating device 100 also includes a first rectification module Z1 and a second rectification module Z2. As shown in Figure 3, the a1 end of the first rectification module Z1 is connected to one end of the first resistor R1 and the first end of the first switching tube K1 respectively, and the c1 end of the first rectification module Z1 is connected to the first node; the second The a2 end of the rectification module Z2 is connected to one end of the second resistor R2 and the first end of the second switch tube K2 respectively, the c2 end of the second rectification module Z2 is connected to the third node; the b1 end of the first rectification module Z1 is connected to the motor The d1 end of the first rectification module is connected with the other end of the motor and the b1 end of the second rectification module respectively. Among them, the first rectification module Z1 is composed of the third diode to the sixth diode (ie, D3 to D6), and the b1 end of the first rectification module Z1 is connected to the live line L, and the second rectification module Z2 is composed of the seventh diode Diodes to tenth diodes (that is, D7 to D10), and the terminal d1 of the second rectification module Z2 is connected to the neutral line N.

Preferably, the third to tenth diodes (that is, D3 to D10 ) may be nS (that is, nanosecond) level high-speed switching tubes, such as fast recovery diode UF4007.

The control module 150 is used for controlling the first driver 130 through the first PWM signal, and controlling the second driver 140 through the second PWM signal, wherein the first PWM signal and the second PWM signal are mutually self-locking.

Specifically, as shown in FIG. 4 , the control module 150 can output alternately the first PWM signal and the second PWM signal. The two signals have a self-locking function, that is, the first PWM signal waits for the second PWM signal to be low Two PWM signals are at high level.

It should be noted that, when the control module 180 is powered on and initialized, the first PWM signal and the second PWM signal output low level at the same time, so as to ensure that the first switching tube K1 and the second switching tube K2 are turned off.

Preferably, in the embodiment of the present utility model, the second power supply VCC2 can supply power to the control module 150, and the control module 150 can be a single-chip microcomputer, which has the advantages of high integration, light weight, and low cost.

In an embodiment of the present invention, as shown in FIG. 3 , the motor speed regulating device may further include a fourth resistor R4, wherein the fourth resistor R4 is connected between the first node and the second node.

In order to facilitate the understanding of the working process of the motor speed control device in the embodiment of the present invention, it can be explained by the following description:

In one embodiment of the present invention, when the motor is in the standby state, after the power is turned on, the alternating current is rectified by the first rectification module Z1 composed of the third diode to the sixth diode (ie D3-D6), and then passed through the first The resistor R1 and the first capacitor C1 charge the second capacitor C2, and the voltage regulation value of the first regulator tube ZD1 determines the voltage level of the first power supply VCC1. The first capacitor C1 is preferably a small-capacity polyester capacitor or a metal film capacitor, and the second capacitor C2 is preferably an electrolytic capacitor. Since the first capacitor C1 has a small capacity and the alternating current is converted to direct current after the first rectifier module Z1, the first capacitor C1 is very fast. After the charging is completed, the second capacitor C2 can be continuously charged through the first resistor R1, and the voltage of the first voltage VCC1 can be kept stable, and at the same time, the first resistor R1 can self-discharge the first capacitor C1. Similarly, after the alternating current is rectified by the second rectifier module Z2 composed of the seventh diode to the tenth diode (that is, D7 to D10), the fourth capacitor C4 is charged through the fifth resistor R5 and the third capacitor C3, and the fourth capacitor C4 is charged by the fifth resistor R5 and the third capacitor C3. The voltage regulation value of the second regulator tube ZD2 can determine the voltage level of the second power supply VCC2. The third capacitor C3 is preferably a small-capacity polyester capacitor or a metal film capacitor, and the fourth capacitor C4 is preferably an electrolytic capacitor. Since the third capacitor C3 has a small capacity, Moreover, the alternating current becomes direct current after passing through the second rectifier module, and the third capacitor C3 is charged quickly, and the fourth capacitor C4 can be continuously charged through the fifth resistor R5, and the voltage of the second power supply VCC2 is kept stable, while the second power supply VCC2 can supply power to the control module 150, and the fifth resistor R5 can self-discharge the third capacitor C3.

Preferably, in the embodiment of the present invention, the first resistor R1 and the fifth resistor R5 are large resistors. Since the resistance values of the first resistor R1 and the fifth resistor R5 are relatively large, the first switching tube K1 and the second switching tube K2 are in an off state, and the passing current is relatively small, and the power consumption is low. It should be noted that, at this time, the first PWM signal and the second PWM signal output by the control module 150 are both low level.

If the second PWM signal output by the control module 150 is at a high level, the second driver 140 is turned on, thereby controlling the second switch tube K2 to be turned on, the second diode D2 to be turned off, and the fourth capacitor C4 to discharge. The switch tube K2 is a MOS tube, the discharge current is very small, and the fourth capacitor C4 has enough power to maintain the voltage of the second power source VCC2 stable during the entire PWM cycle of the second switch tube K2. When the control module 150 controls the output of the second PWM signal to be at a low level, the second driver 140 is turned off, the second switch tube K2 is turned off, and the voltage across the drain and source of the second switch tube K2 begins to rise rapidly, but Since the third capacitor C3 charges the fourth capacitor C4 through the second diode D2, the sudden change in the voltage across the drain and source of the second switching tube K2 is reduced, that is, the voltage slope is reduced, thereby not only reducing The higher harmonics of the second switching tube K2 can be eliminated, and the fourth capacitor C4 can be quickly charged to maintain the stability of the second power supply VCC2.

If the first PWM signal output by the control module 150 is at a high level, the first driver 130 is turned on, and then the first switch tube K1 is controlled to be turned on, the first diode D1 is turned off, and the second capacitor C2 is discharged. The tube K1 is a MOS tube, the discharge current is very small, and the second capacitor C2 has enough power to maintain the voltage stability of the first power supply VCC1 when the first switching tube K1 is turned on during the entire PWM cycle. When the first PWM signal output by the control module 150 is at low level, the first driver 130 is turned off, the first switching tube K1 is turned off, and the voltage across the drain and source of the first switching tube K1 begins to rise rapidly. A capacitor C1 charges the second capacitor C2 through the first diode D1, which reduces the sudden change in the voltage across the drain and source of the first switch tube K1, that is, reduces the voltage slope, thereby not only reducing the The higher harmonics of a switching tube K1 can quickly charge the second capacitor C2 to maintain the stability of the first power supply VCC1

According to the motor speed control device of the embodiment of the present invention, the stability of the first power supply voltage is maintained by the first charging module, the first diode and the first voltage stabilizing module in the first switch module, and the stability of the first power supply voltage in the second voltage stabilizing module is The second charging module, the second diode, and the second voltage stabilizing module maintain the stability of the second power supply voltage, and then can provide a stable voltage for the control module, thereby improving its own reliability, and there is no need to set a separate DC The power circuit supplies power, reduces the cost, reduces the complexity of the circuit, and reduces the packaging volume.

Furthermore, the embodiment of the present utility model also provides a household appliance, including a motor and the motor speed regulating device of the above-mentioned embodiments of the present utility model. The motor speed control device in the household appliance can maintain the stability of the power supply, and then effectively control the opening and closing of the switch module, thereby improving the reliability of the household appliance speed control system, and the motor speed control circuit in the household appliance The complexity of the DC power supply circuit is low, the packaging volume is small, and the cost is low.

In an embodiment of the present utility model, the household appliance may be, but not limited to, an air conditioner, a washing machine, a fan, and the like.

In addition, other configurations and functions of the household appliance according to the embodiment of the present invention are known to those skilled in the art, and will not be described here in order to reduce redundancy.

In the description of the present utility model, it should be understood that the terms "first" and "second" are only used for descriptive purposes, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the number of indicated technical features . Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of these features.

In this utility model, unless otherwise specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrated; may be mechanically or electrically connected; may be directly connected or indirectly connected through an intermediary, and may be an internal communication between two elements or an interactive relationship between two elements, unless otherwise stated Clearly defined. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model according to specific situations.

In the description of this specification, descriptions with reference to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structures, materials or features are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the described specific features, structures, materials or characteristics may be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without conflicting with each other.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above-mentioned embodiments are exemplary and should not be construed as limitations of the present invention, and those skilled in the art are within the scope of the present invention. Variations, modifications, substitutions and variations can be made to the above-described embodiments.

Claims (12)

1. a motor speed control device, it is characterised in that including:

With the first switch module of motor parallel, wherein, described first switch module includes the first charging module, the one or two pole Pipe, the first Voltage stabilizing module and the first switching tube, described first charging module, described first diode, described first voltage stabilizing mould Block and described first switching tube are connected in series；

The second switch module connected with described motor, wherein, described second switch module include the second charging module, second Diode, the second Voltage stabilizing module and second switch pipe are described second charging module, described second diode, described second steady Die block and described second switch pipe are connected in series；

Drive the first driver of described first switch module；

Drive the second driver of described second switch module；

Control module, described control module is for controlling described first driver by the first pwm signal, and passes through the 2nd PWM Signal controls described second driver, wherein, described first pwm signal and the described second mutual self-locking of pwm signal.

2. motor speed control device as claimed in claim 1, it is characterised in that described first charging module includes:

First resistance, one end of described first resistance is connected with the first end of described first switching tube, described first resistance another One end is connected with the anode of described first diode；

First electric capacity, described first electric capacity is connected with described first resistor coupled in parallel.

3. motor speed control device as claimed in claim 1, it is characterised in that described first Voltage stabilizing module includes:

First stabilivolt, the negative electrode of described first stabilivolt is connected with negative electrode and first power supply of described first diode respectively, The anode of described first stabilivolt is connected with the second end of described first switching tube, and at described first stabilivolt and described first Primary nodal point is formed between switching tube；

Second electric capacity, described second electric capacity is connected in parallel with described first stabilivolt.

4. motor speed control device as claimed in claim 3, it is characterised in that the first end of described first driver is with described First pwm signal end of control module is connected, described first drive the second end of module by the second resistance eutral grounding, described the 3rd end of one driver is connected by the 3rd resistance and the first power supply, and the 4th end of described first driver is opened with described first The 3rd end closing pipe is connected, and forms secondary nodal point between described first driver and described first switching tube.

5. motor speed control device as claimed in claim 4, it is characterised in that described first driver be electric coupler or The isolating transformer of equivalent.

6. motor speed control device as claimed in claim 4, it is characterised in that also include:

The 4th resistance being connected between described primary nodal point and described secondary nodal point.

7. motor speed control device as claimed in claim 2, it is characterised in that described second charging module includes:

5th resistance, one end of described 5th resistance is connected with the first end of described second switch pipe, described 5th resistance another One end is connected with the anode of described second diode；

3rd electric capacity, described 3rd electric capacity is connected with described 5th resistor coupled in parallel.

8. motor speed control device as claimed in claim 3, it is characterised in that described second Voltage stabilizing module includes:

Second stabilivolt, the negative electrode of described second stabilivolt is connected with negative electrode and the second source of described second diode respectively, The anode of described second stabilivolt is connected with the 3rd end of described second switch pipe by the 6th resistance, and in described second voltage stabilizing The 3rd node is formed between pipe and described 6th resistance；

4th electric capacity, described 4th electric capacity is connected in parallel with described second stabilivolt.

9. motor speed control device as claimed in claim 1, it is characterised in that the first end of described second driver is by the Seven resistance are connected with the second pwm signal end of described control module, the second end of described second driver by the 8th resistance with Second source is connected, and the 3rd end of described second driver is connected with the 3rd end of described second switch pipe, wherein, and described the Second end ground connection of two switching tubes.

10. motor speed control device as claimed in claim 7, it is characterised in that described first electric capacity and described 3rd electric capacity For electric capacity of the dacron or metal film electric capacity.

11. motor speed control devices as claimed in claim 8, it is characterised in that described second electric capacity and described 4th electric capacity For electrochemical capacitor.

12. 1 kinds of household electrical appliance, it is characterised in that including:

Motor；

Motor speed control device as according to any one of claim 1-11.