CN105680758A - Motor speed regulation device and household appliance - Google Patents
Motor speed regulation device and household appliance Download PDFInfo
- Publication number
- CN105680758A CN105680758A CN201610201376.8A CN201610201376A CN105680758A CN 105680758 A CN105680758 A CN 105680758A CN 201610201376 A CN201610201376 A CN 201610201376A CN 105680758 A CN105680758 A CN 105680758A
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- CN
- China
- Prior art keywords
- motor speed
- thermistor
- control device
- switch module
- motor
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P23/00—Arrangements or methods for the control of AC motors characterised by a control method other than vector control
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/02—Providing protection against overload without automatic interruption of supply
- H02P29/024—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
- H02P29/027—Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load the fault being an over-current
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Control Of Electric Motors In General (AREA)
- Control Of Ac Motors In General (AREA)
Abstract
The invention discloses a motor speed regulation device and a household appliance. The motor speed regulation device comprises a first switch module connected with a motor in parallel; a second switch module connected with the motor in series; a thermistor connected in series with the first switch module or the second switch module; and a control module used for controlling the first switch module through a first PWM signal and controlling the second switch module through a second PWM signal, wherein the first PWM signal and the second PWM signal are self-locked mutually. The motor speed regulation device can adjust the current of the switch modules through the thermistor when a circuit is disturbed or abnormal, thereby preventing devices from being damaged; and the motor speed regulation device can enable the circuit to restore to the normal working state automatically after the interference or abnormity is eliminated, thereby ensuring reliability of motor speed regulation.
Description
Technical field
The present invention relates to Motor Control Field, be specifically related to a kind of motor speed control device and household electrical appliance.
Background technology
In correlation technique, as shown in Figure 1, by " single phase ac electric switch circuit " PWM (PulseWidthModulation,Pulse width modulation) modulate. Particularly, the voltage at motor two ends is carried out to high speed opening and closing, to regulate electricityThe average voltage at machine two ends, reaches the object of speed governing. In the time that " motor inductance current bleed-off circuit " is on-off circuit, figure1 can be reduced to Fig. 2. As shown in Figure 2, (that is: K1 closes the time that K2 opens to the switching dead time between K1 and K2And K2 closes the time that K1 opens) be that the voltage producing during according to K2 switch is controlled, Dead Time is uncontrollable, and is subject toThe time response differentia influence of K1, K2 device is larger, may cause K1 and K2 to occur temporary transient short circuit, causes K1 and K2 temperatureRaise, even burn.
In addition, if adopt symmetrical PWM self-locking mode activated K1, K2, Dead Time will be accomplished 1～2 μ s conventionally, hands over like thisThe back-pressure of stream motor can be very high, conventionally need to absorb in jumbo capacitor C of motor two ends parallel connection and resistance R,Be called RC absorption circuit, in RC absorption circuit, capacitor C too conference causes the caloric value of resistance R high, and loss strengthens,Be unfavorable for the reliable and stable work of circuit, needed volume is also large simultaneously, is unfavorable for the miniaturization of circuit. If reduce deadDistrict's time to 0.1～1 μ s, when occurring likely occurring that temporary transient short circuit appears in K1 and K2 when interference, and burns K1 and K2.
Summary of the invention
The present invention is intended to solve at least to a certain extent one of technical problem in above-mentioned technology. For this reason, of the present invention firstIndividual object is to propose a kind of motor speed control device. This motor speed control device can, in the time that circuit occurs disturbing or be abnormal, be avoidedDevice failure, improves the reliability of controlling speed governing.
Second object of the present invention is to propose a kind of household electrical appliance.
For achieving the above object, first aspect present invention embodiment has proposed a kind of motor speed control device, comprising: with motor alsoThe first switch module of connection; The second switch module of connecting with described motor; Thermistor, described thermistor and describedOne switch module or described second switch module are connected in series; Control module, described control module is for believing by a PWMNumber control described the first switch module, and by second switch module described in the second pwm signal control, wherein, described firstPwm signal and the mutual self-locking of described the second pwm signal.
The motor speed control device of the embodiment of the present invention, in the time that circuit occurs disturbing or is abnormal, can be by connecting with switch moduleThermistor adjust the electric current of switch module, avoid device failure, and disturb or abnormal restoring after, can make circuit fromThe moving normal operating conditions that returns to.
In addition, motor speed control device according to the above embodiment of the present invention can also have following additional technical characterictic:
According to one embodiment of present invention, described device also comprises: with the absorption module of described motor parallel, wherein, instituteState absorption module and comprise the first resistance and the first electric capacity, described the first resistance is connected with described the first capacitances in series.
According to one embodiment of present invention, described the first switch module comprises that the first diode bridge rectifier circuit and first opensGuan Guan, wherein, the first end of described the first switching tube is connected with the cathode end of described the first diode bridge rectifier circuit.
According to one embodiment of present invention, described second switch module comprises that the second diode bridge rectifier circuit and second opensGuan Guan, wherein, the first end of described second switch pipe is connected with the cathode end of described the second diode bridge rectifier circuit.
According to one embodiment of present invention, one end of described thermistor is connected with the second end of described the first switching tube, instituteThe other end of stating thermistor is connected with the anode output end of described the first diode bridge rectifier circuit.
According to one embodiment of present invention, one end of described thermistor is connected with the first end of described second switch pipe, instituteThe other end of stating thermistor is connected with the anode output end of described the second diode bridge rectifier circuit.
According to one embodiment of present invention, described the first pwm signal output is by the second resistance and described the first switching tubeThe 3rd end be connected.
According to one embodiment of present invention, described the second pwm signal output is by the 3rd resistance and described second switch pipeThe 3rd end be connected.
According to one embodiment of present invention, the 3rd end ground connection of described second switch pipe, or, described second switch pipeThe 3rd end is by described thermistor ground connection.
For achieving the above object, second aspect present invention embodiment has proposed a kind of household electrical appliance, comprising: motor and the present inventionThe motor speed control device of above-described embodiment. This household electrical appliance operational reliability is high, and long service life.
The aspect that the present invention is additional and advantage in the following description part provide, and part will become bright from the following descriptionAobvious, or recognize by practice of the present invention.
Brief description of the drawings
Above-mentioned and/or additional aspect of the present invention and advantage from conjunction with below accompanying drawing to becoming obvious the description of embodimentWith easy understanding, wherein:
Fig. 1 is the schematic diagram of motor speed regulating method in correlation technique;
Fig. 2 is the schematic diagram of motor speed regulating method in correlation technique;
Fig. 3 is the structural representation of motor speed control device according to an embodiment of the invention;
Fig. 4 is the structural representation of motor speed control device in accordance with another embodiment of the present invention;
Fig. 5 is according to the pwm signal schematic diagram of the control module output of the embodiment of the present invention; And
Fig. 6-Figure 12 is the structural representation of motor speed control device according to some embodiments of the invention.
Detailed description of the invention
Describe embodiments of the invention below in detail, the example of described embodiment is shown in the drawings, wherein identical from start to finishOr similarly label represents same or similar element or has the element of identical or similar functions. Below by retouching with reference to accompanying drawingThe embodiment stating is exemplary, is intended to for explaining the present invention, and can not be interpreted as limitation of the present invention.
Motor speed control device and the household electrical appliance of the embodiment of the present invention are described below with reference to accompanying drawing.
Fig. 3 is according to the structural representation of the motor speed control device of the embodiment of the present invention. As shown in Figure 3, this electric machine speed regulation dressPut and comprise: the first switch module 110, second switch module 120, thermistor RP and control module 130.
Wherein, the first switch module 110 and motor parallel. As shown in Figure 3, the first switch module 110 comprises the one or two utmost pointPipe bridge rectifier Z1 and the first switching tube K1, wherein, the first end of the first switching tube K1 and the first diode bridge are wholeThe cathode end of current circuit Z1 is connected
Second switch module 120 is connected with motor. As shown in Figure 3, second switch module 120 comprises the second diode bridgeRectification circuit Z2 and second switch pipe K2, wherein, the first end of second switch pipe K2 and described the second diode bridge rectificationThe cathode end of circuit Z2 is connected.
As shown in Figure 3,4, the first pwm signal output of control module 130 is by the second resistance R 2 and the first switching tubeThe 3rd end of K1 is connected, and the second pwm signal output by the 3rd resistance R 3 the 3rd end phase with second switch pipe K2Connect.
Particularly, as shown in Figure 5, control module 130 can be exported the first pwm signal and the second pwm signal alternately,Two mutual self-lockings of signal, when the first pwm signal is low level, the second pwm signal is high level, and the second pwm signalAfter the first pwm signal is low level a period of time, become high level, this period of time is Dead Time.
It should be noted that, control module 130 power-up initializings, the first pwm signal and the second pwm signal are low electricity simultaneouslyFlat, to ensure that the first switching tube K1 and second switch pipe K2 disconnect.
As shown in Figure 3,4, this motor speed control device can also comprise absorption module 140. Wherein, absorption module 140 comprisesThe first resistance R 1 and the first capacitor C 1, the first resistance R 1 and the first capacitor C 1 are connected in series.
In an embodiment of the present invention, the high back voltage that absorption module 140 produces for absorbing motor two ends. UnderstandableBe, the first capacitor C 1 in absorption module 140 is large bulk capacitance, and the first resistance R 1 is large resistance.
As shown in Figure 3, in one embodiment of the invention, thermistor RP and the first switch module 110 are connected in series.
Particularly, one end of thermistor RP is connected with the second end of the first switching tube K1, the other end of thermistor RP withThe anode output end of the first diode bridge rectifier circuit Z1 is connected.
In an embodiment of the present invention, the 3rd end ground connection of second switch pipe.
Preferably, the rated current of the thermistor RP of the first switching tube K1 series connection in the first switch module can be according to electricityThe electric current of machine is chosen, and for example, if the electric current of motor is 200mA, the rated operational current of choosing thermistor RP is also200mA。
Particularly, in the time that motor is normally worked, the normal running current of motor is 200mA, the specified work of thermistor RPMaking electric current is also 200mA, occurs that at the first switching tube K1 when abnormal, for example, the electric current of the first switching tube K1 increases to 500mATime, the electric current that flows through thermistor RP is greater than rated current, and thermistor RP generates heat rapidly, and resistance value increases, and subtracts with thisThe little electric current that flows through the first switching tube K1, prevents the faults such as the first switching tube K1 burns. When after above-mentioned abnormal restoring, firstThe electric current of switching tube K1 returns to 200mA, and the electric current of thermistor RP also returns to normally, the resistance value of thermistor RPDiminish rapidly, circuit returns to normal operating condition.
In another embodiment of the present invention, as shown in Figure 4, thermistor RP and second switch module 120 are connected in series.
Particularly, one end of thermistor RP is connected with the first end of second switch pipe K2, the other end of thermistor RP withThe anode output end of the second diode bridge rectifier circuit Z2 is connected.
In an embodiment of the present invention, the 3rd end of second switch pipe K2 is by thermistor RP ground connection.
Preferably, the second switch pipe K2 series thermal-sensitive resistance R P in second switch module 120, the volume of thermistor RPDetermine electric current and choose according to the electric current of motor, for example, if the electric current of motor is 200mA, choose the specified of thermistor RPOperating current is 200mA.
Particularly, in the time that motor is normally worked, the normal running current of motor is 200mA, the specified work of thermistor RPMaking electric current is also 200mA, for example, when second switch pipe K2 occurs that when abnormal,, the electric current of second switch pipe K2 increases to 500mATime, the electric current that flows through thermistor RP is greater than rated current, and thermistor RP generates heat rapidly, and resistance value increases, and subtracts with thisRill is crossed the electric current of second switch pipe K2, prevents the faults such as second switch pipe K2 burns. When after above-mentioned abnormal restoring, secondThe electric current of switching tube K2 returns to 200mA, and the electric current of thermistor RP also returns to normally, the resistance value of thermistor RPDiminish rapidly, circuit returns to normal operating condition.
The motor speed control device of the embodiment of the present invention, in the time that circuit occurs disturbing or is abnormal, can be by connecting with switch moduleThermistor adjust the electric current of switch module, avoid device failure, and disturb or abnormal restoring after, can make circuit fromThe moving normal operating conditions that returns to.
It should be noted that, the present invention can be at the disclosed stepless speed regulation circuit of single-phase alternating-current motor of CN201010560552.XMiddle enforcement, embodiment is as shown in Fig. 6-12, and concrete principle is similar to the aforementioned embodiment, in order to reduce redundancy, does not do hereinRepeat.
Further, embodiments of the invention have also proposed a kind of household electrical appliance, comprise motor and the above embodiment of the present inventionMotor speed control device. This household electrical appliance operational reliability is high, and long service life.
In one embodiment of the invention, these household electrical appliance can be, but not limited to air-conditioner, washing machine, fan etc.
In addition, according to other formations of the household electrical appliance of the embodiment of the present invention and effect for those of ordinary skill in the artBe all known, in order to reduce redundancy, do not repeat herein.
In description of the invention, it will be appreciated that, term " first ", " second " be only for describing object, and can notBe interpreted as instruction or hint relative importance or the implicit quantity that indicates indicated technical characterictic. Be limited with thus, " theOne ", at least one this feature can be expressed or impliedly be comprised to the feature of " second ".
In the present invention, unless otherwise clearly defined and limited, term " installation ", " being connected ", " connection ", " fixing "Should be interpreted broadly Deng term, for example, can be to be fixedly connected with, and can be also to removably connect, or integral; Can beMechanical connection can be also electrical connection; Can be to be directly connected, also can indirectly be connected by intermediary, can be twoThe interaction relationship of the connection of individual element internal or two elements, unless separately there is clear and definite restriction. Common for this areaTechnical staff, can understand above-mentioned term concrete meaning in the present invention as the case may be.
In the description of this description, reference term " embodiment ", " some embodiment ", " example ", " specifically showExample " or the description of " some examples " etc. the specific features that means to describe in conjunction with this embodiment or example, structure, material orFeature is contained at least one embodiment of the present invention or example. In this manual, the schematic statement to above-mentioned termNot must for be identical embodiment or example. And specific features, structure, material or the feature of description canIn one or more embodiment in office or example with suitable mode combination. In addition, not conflicting in the situation that, abilityThe technical staff in territory can enter the feature of the different embodiment that describe in this description or example and different embodiment or exampleRow combination and combination.
Although illustrated and described embodiments of the invention above, be understandable that, above-described embodiment is exemplary,Can not be interpreted as limitation of the present invention, those of ordinary skill in the art within the scope of the invention can be to above-described embodimentChange, amendment, replacement and modification.
Claims (10)
1. a motor speed control device, is characterized in that, comprising:
The first switch module with motor parallel;
The second switch module of connecting with described motor;
Thermistor, described thermistor and described the first switch module or described second switch module are connected in series;
Control module, described control module is used for by the first switch module described in the first pwm signal control, and by secondSecond switch module described in pwm signal control, wherein, described the first pwm signal and the mutual self-locking of described the second pwm signal.
2. motor speed control device as claimed in claim 1, is characterized in that, also comprises:
With the absorption module of described motor parallel, wherein, described absorption module comprises the first resistance and the first electric capacity, describedOne resistance is connected with described the first capacitances in series.
3. motor speed control device as claimed in claim 1, is characterized in that, described the first switch module comprises the one or two utmost pointPipe bridge rectifier and the first switching tube, wherein, the first end of described the first switching tube and described the first diode bridge are wholeThe cathode end of current circuit is connected.
4. motor speed control device as claimed in claim 1, is characterized in that, described second switch module comprises the two or two utmost pointPipe bridge rectifier and second switch pipe, wherein, the first end of described second switch pipe and described the second diode bridge are wholeThe cathode end of current circuit is connected.
5. motor speed control device as claimed in claim 3, is characterized in that, one end of described thermistor and described firstThe second end of switching tube is connected, the anode output of the other end of described thermistor and described the first diode bridge rectifier circuitEnd is connected.
6. motor speed control device as claimed in claim 4, is characterized in that, one end of described thermistor and described secondThe first end of switching tube is connected, the anode output of the other end of described thermistor and described the second diode bridge rectifier circuitEnd is connected.
7. motor speed control device as claimed in claim 3, is characterized in that, described the first pwm signal output is by theTwo resistance are connected with the 3rd end of described the first switching tube.
8. motor speed control device as claimed in claim 4, is characterized in that, described the second pwm signal output is by theThree resistance are connected with the 3rd end of described second switch pipe.
9. motor speed control device as claimed in claim 6, is characterized in that, the 3rd end ground connection of described second switch pipe,Or the 3rd end of described second switch pipe is by described thermistor ground connection.
10. household electrical appliance, is characterized in that, comprising:
Motor;
Motor speed control device as claimed in any one of claims 1-9 wherein.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610201376.8A CN105680758A (en) | 2016-03-31 | 2016-03-31 | Motor speed regulation device and household appliance |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610201376.8A CN105680758A (en) | 2016-03-31 | 2016-03-31 | Motor speed regulation device and household appliance |
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| Publication Number | Publication Date |
|---|---|
| CN105680758A true CN105680758A (en) | 2016-06-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610201376.8A Pending CN105680758A (en) | 2016-03-31 | 2016-03-31 | Motor speed regulation device and household appliance |
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| CN (1) | CN105680758A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102045022A (en) * | 2009-11-16 | 2011-05-04 | 孙宏斌 | Stepless speed regulating circuit of single-phase alternating-current motor |
| CN103269143A (en) * | 2013-05-06 | 2013-08-28 | 德清县金宇达电气有限公司 | Two-phase brushless direct current motor |
| CN204013221U (en) * | 2014-07-14 | 2014-12-10 | 美的集团武汉制冷设备有限公司 | Direct current machine electric supply installation and power supply protection circuit thereof |
| EP2819294A1 (en) * | 2013-06-24 | 2014-12-31 | Electrolux Appliances Aktiebolag | Electric household appliance with an electronic control device for controlling an universal electric motor |
| CN205647326U (en) * | 2016-03-31 | 2016-10-12 | 广东美的环境电器制造有限公司 | Motor speed regulating device and domestic appliance |
-
2016
- 2016-03-31 CN CN201610201376.8A patent/CN105680758A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102045022A (en) * | 2009-11-16 | 2011-05-04 | 孙宏斌 | Stepless speed regulating circuit of single-phase alternating-current motor |
| CN103269143A (en) * | 2013-05-06 | 2013-08-28 | 德清县金宇达电气有限公司 | Two-phase brushless direct current motor |
| EP2819294A1 (en) * | 2013-06-24 | 2014-12-31 | Electrolux Appliances Aktiebolag | Electric household appliance with an electronic control device for controlling an universal electric motor |
| CN204013221U (en) * | 2014-07-14 | 2014-12-10 | 美的集团武汉制冷设备有限公司 | Direct current machine electric supply installation and power supply protection circuit thereof |
| CN205647326U (en) * | 2016-03-31 | 2016-10-12 | 广东美的环境电器制造有限公司 | Motor speed regulating device and domestic appliance |
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Application publication date: 20160615 |