TWI426696B - Driving device of brushless dc motor for fan and driving method thereof - Google Patents
Driving device of brushless dc motor for fan and driving method thereof Download PDFInfo
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Description
本發明關於一種驅動裝置及其驅動方法，特別關於一種風扇用直流無刷馬達之驅動裝置及其驅動方法。
The present invention relates to a driving device and a driving method thereof, and more particularly to a driving device for a DC brushless motor for a fan and a driving method thereof.
請參閱圖1A所示，其係為一種習知之直流無刷馬達之驅動裝置1A。其中，驅動裝置1A係藉由兩個N型金氧半場效電晶體作為開關，以驅動直流無刷馬達。雖然驅動裝置1A具有結構簡單以及價格便宜的優點，然而，驅動裝置1A的效率較差，而與現今所強調之環保節能的概念背道而馳。
為提升驅動裝置之效率，有業者提出一種全橋架構的驅動裝置1B。請參閱圖1B所示，驅動裝置1B包括一上橋電路及一下橋電路。其中，上橋電路係由兩個P型金氧半場效電晶體所構成，而下橋電路則由兩個N型金氧半場效電晶體所組成。
雖然，驅動裝置1B具有較佳的效率，但由於P型金氧半場效電晶體在切換速度及切換耗損的表現上均不及N型金氧半場效電晶體。因此，當應用於較大功率之風扇，或需要有更高切換速度之驅動技術時，一般的作法係將上橋電路中之P型金氧半場效電晶體改為N型金氧半場效電晶體。
為配合N型金氧半場效電晶體的操作特性，當採用上、下橋電路皆為N型金氧半場效電晶體之馬達驅動裝置時，業界係使用一整合式驅動IC以控制驅動裝置。然而，整合式驅動IC的價格不僅較為昂貴，且整合式驅動IC的操作電壓範圍係介於10～20伏特，因而當選用之風扇的驅動電源為低於10伏特時，整合式驅動IC將無法正常運作。
因此，如何提供一種風扇用直流無刷馬達之驅動裝置及其驅動方法，使其具有簡單結構，並具有較大的操作電壓範圍，進而增加驅動裝置之應用性及馬達之品質，已成為重要課題之一。
Referring to FIG. 1A, it is a conventional DC brushless motor driving device 1A. Among them, the driving device 1A uses two N-type gold-oxygen half field effect transistors as switches to drive the DC brushless motor. Although the driving device 1A has the advantages of simple structure and low cost, the driving device 1A is inefficient, and runs counter to the concept of environmental protection and energy saving emphasized today.
In order to improve the efficiency of the driving device, a driver device 1B of a full bridge architecture has been proposed. Referring to FIG. 1B, the driving device 1B includes an upper bridge circuit and a lower bridge circuit. Among them, the upper bridge circuit is composed of two P-type gold-oxygen half-field effect transistors, and the lower bridge circuit is composed of two N-type gold-oxygen half-field effect transistors.
Although the driving device 1B has better efficiency, the P-type gold-oxygen half field effect transistor is inferior to the N-type metal oxide half field effect transistor in the performance of switching speed and switching loss. Therefore, when applied to a fan with a larger power, or a driving technology requiring a higher switching speed, the general practice is to change the P-type gold-oxygen half-field effect transistor in the upper bridge circuit to the N-type gold-oxygen half-field effect. Crystal.
In order to match the operating characteristics of the N-type gold-oxygen half-field effect transistor, when the upper and lower bridge circuits are all N-type metal oxide half-field effect transistor motor driving devices, the industry uses an integrated driving IC to control the driving device. However, the price of the integrated driver IC is not only expensive, but the operating voltage range of the integrated driver IC is between 10 and 20 volts. Therefore, when the driving power of the selected fan is less than 10 volts, the integrated driver IC will not be able to working normally.
Therefore, how to provide a driving device for a DC brushless motor for a fan and a driving method thereof have a simple structure and a large operating voltage range, thereby increasing the applicability of the driving device and the quality of the motor, which has become an important issue. one.
有鑑於上述課題，本發明之目的為提供一種具有簡單結構，並具有較大的操作電壓範圍，進而增加驅動裝置之應用性及馬達之品質之風扇用直流無刷馬達之驅動裝置及其驅動方法。
緣是，為達上述目的，依據本發明之ㄧ種風扇用直流無刷馬達之驅動裝置，包括一保護電路、一儲能電路、一控制電路及一橋式電路。保護電路與一輔助電源電性連接。儲能電路與保護電路電性連接。控制電路與保護電路及儲能電路電性連接，控制電路並分別接收一第一控制訊號、一第二控制訊號、一第三控制訊號及一第四控制訊號。橋式電路與控制電路電性連接，橋式電路具有一第一開關單元、一第二開關單元、一第三開關單元及一第四開關單元。第一開關單元與第二開關單元與一馬達線圈之一端耦接，第三開關單元與第四開關單元與馬達線圈之另一端耦接，且第一開關單元與第三開關單元電性連接，第二開關單元與第四開關單元電性連接。其中控制電路於第一操作期間，導通第二開關單元與第四開關單元，於一第二操作期間，導通第一開關單元與第四開關單元，並於一第三操作期間，導通第二開關單元與第三開關單元，且儲能電路於第一操作期間接收輔助電源。
本發明之一實施例中，其中橋式電路之第一開關單元、第二開關單元、第三開關單元與第四開關單元分別為一N型金氧半場效電晶體。
為達上述目的，依據本發明之ㄧ種風扇用直流無刷馬達之驅動方法，係與一驅動裝置配合應用，其中驅動裝置具有一保護電路、一儲能電路、一控制電路及一橋式電路。保護電路與一輔助電源電性連接。儲能電路與保護電路電性連接。控制電路與保護電路及儲能電路電性連接，並分別接收一第一控制訊號、一第二控制訊號、一第三控制訊號及一第四控制訊號。橋式電路與控制電路電性連接，且橋式電路具有一第一開關單元、一第二開關單元、一第三開關單元及一第四開關單元。其中第一開關單元與第二開關單元與一馬達之一端耦接，第三開關單元與第四開關單元與馬達之另一端耦接，且第一開關單元與第三開關單元電性連接，第二開關單元與第四開關單元電性連接。驅動方法包括：於一第一操作期間，分別依據第二控制訊號與第四控制訊號而導通第二開關單元及第四開關單元，以使儲能電路於第一操作期間接收輔助電源，並儲存之，並進入一第二操作期間及一第三操作期間其中之一；於第二操作期間，分別依據第一控制訊號及第四控制訊號而導通第一開關單元與第四開關單元，並進入第三操作期間；以及於第三操作期間，分別依據第二控制訊號及第三控制訊號而導通第二開關單元與第三開關單元，並進入第二操作期間。
本發明之一實施例中，其中輔助電源之電壓介於4至20伏特。
承上所述，因依據本發明之ㄧ種風扇用直流無刷馬達之驅動裝置係藉由儲能電路與控制電路的配合應用，以提供符合導通橋式電路之第一開關單元與第三開關單元所需的電壓準位，從而實現具有簡單結構，並具有較大的操作電壓範圍，進而增加驅動裝置之應用性及馬達之品質的風扇用直流無刷馬達之驅動裝置及其驅動方法。
In view of the above problems, an object of the present invention is to provide a DC brushless motor driving device for a fan having a simple structure and having a large operating voltage range, thereby increasing the applicability of the driving device and the quality of the motor, and a driving method thereof .
In order to achieve the above object, a driving device for a DC brushless motor for a fan according to the present invention includes a protection circuit, a storage circuit, a control circuit and a bridge circuit. The protection circuit is electrically connected to an auxiliary power source. The energy storage circuit is electrically connected to the protection circuit. The control circuit is electrically connected to the protection circuit and the energy storage circuit, and the control circuit receives a first control signal, a second control signal, a third control signal and a fourth control signal, respectively. The bridge circuit is electrically connected to the control circuit. The bridge circuit has a first switch unit, a second switch unit, a third switch unit and a fourth switch unit. The first switch unit and the second switch unit are coupled to one end of the motor coil, the third switch unit and the fourth switch unit are coupled to the other end of the motor coil, and the first switch unit is electrically connected to the third switch unit. The second switch unit is electrically connected to the fourth switch unit. The control circuit turns on the second switch unit and the fourth switch unit during the first operation, turns on the first switch unit and the fourth switch unit during a second operation, and turns on the second switch during a third operation And the third switching unit, and the energy storage circuit receives the auxiliary power source during the first operation.
In an embodiment of the invention, the first switching unit, the second switching unit, the third switching unit and the fourth switching unit of the bridge circuit are respectively an N-type gold-oxygen half field effect transistor.
In order to achieve the above object, a driving method of a DC brushless motor for a fan according to the present invention is applied in cooperation with a driving device, wherein the driving device has a protection circuit, a storage circuit, a control circuit and a bridge circuit. The protection circuit is electrically connected to an auxiliary power source. The energy storage circuit is electrically connected to the protection circuit. The control circuit is electrically connected to the protection circuit and the energy storage circuit, and respectively receives a first control signal, a second control signal, a third control signal and a fourth control signal. The bridge circuit is electrically connected to the control circuit, and the bridge circuit has a first switch unit, a second switch unit, a third switch unit and a fourth switch unit. The first switch unit and the second switch unit are coupled to one end of the motor, the third switch unit and the fourth switch unit are coupled to the other end of the motor, and the first switch unit is electrically connected to the third switch unit. The two switch units are electrically connected to the fourth switch unit. The driving method includes: turning on the second switching unit and the fourth switching unit according to the second control signal and the fourth control signal during a first operation, so that the energy storage circuit receives the auxiliary power during the first operation, and stores And entering a second operation period and a third operation period; during the second operation, turning on the first switching unit and the fourth switching unit according to the first control signal and the fourth control signal, respectively, and entering During the third operation period; and during the third operation, the second switching unit and the third switching unit are turned on according to the second control signal and the third control signal, respectively, and enter the second operation period.
In one embodiment of the invention, the voltage of the auxiliary power source is between 4 and 20 volts.
According to the above, the driving device of the DC brushless motor for the fan according to the present invention is applied by the storage circuit and the control circuit to provide the first switching unit and the third switch complying with the conduction bridge circuit. The voltage level required by the unit, thereby realizing a driving device for a DC brushless motor for a fan having a simple structure and having a large operating voltage range, thereby increasing the applicability of the driving device and the quality of the motor, and a driving method thereof.
以下將參照相關圖式，說明依據本發明較佳實施例之一種風扇用直流無刷馬達之驅動裝置。
首先，請參照圖2，其為依據本發明較佳實施例之一種直流無刷馬達之驅動裝置2。驅動裝置2包括一保護電路21、一儲能電路22、一控制電路23及一橋式電路24。
保護電路21與一輔助電源Vdd
電性連接。在本實施例中，保護電路21具有一第一保護單元D1及一第二保護單元D2，而在實施上，第一保護單元D1及一第二保護單元D2係可分別為一二極體。
儲能電路22與保護電路21電性連接。在本實施例中，儲能電路22具有一第一電容器C1及一第二電容器C2。其中，第一電容器C1與第二電容器C2係分別與第一保護單元D1及第二保護單元D2電性連接。
其中，第一保護單元D1及第二保護單元D2除了提供第一電容器C1及第二電容器C2一充電路徑之外，並可防止電壓反饋至輔助電源Vdd
。
控制電路23與保護電路21及儲能電路22電性連接。控制電路23分別接收一第一控制訊號S1、一第二控制訊號S2、一第三控制訊號S3及一第四控制訊號S4。
橋式電路24與控制電路23電性連接。在本實施例中，橋式電路24具有一第一開關單元Q1、一第二開關單元Q2、一第三開關單元Q3及一第四開關單元Q4。其中，第一開關單元Q1～第四開關單元Q4係分別為一N型金氧半場效電晶體。此外，第一開關單元Q1之源極與第二開關單元Q2之汲極與一馬達線圈L之一端耦接。第三開關單元Q3之源極與第四開關單元Q4之汲極與馬達線圈L之另一端耦接，且第一開關單元Q1之汲極與第三開關單元Q3之汲極與一馬達驅動電源VCC
電性連接，而第二開關單元Q2之源極與第四開關單元Q4之源極與一接地端電性連接。
在實際運用上，控制電路23係於一第一操作期間，接收低位準之第一控制訊號S1及第三控制訊號S3，以及高位準之第二控制訊號S2及第四控制訊號S4，並依據第二控制訊號S2及第四控制訊號S4導通第二開關單元Q2與第四開關單元Q4，進而使儲能電路22之第一電容器C1及第二電容器C2接收輔助電源Vdd
並儲存之。於一第二操作期間，控制電路23接收高位準之第一控制訊號S1及第四控制訊號S4，以及低位準之第二控制訊號S2及第三控制訊號S3，並依據第一控制訊號S1及第四控制訊號S4導通第一開關單元Q1與第四開關單元Q4。於一第三操作期間，控制電路23接收低位準之第一控制訊號S1及第四控制訊號S4，以及高位準之第二控制訊號S2及第三控制訊號S3，並依據第二控制訊號S2及第三控制訊號S3導通第二開關單元Q2與第三開關單元Q3。
另外，值得一提的是，驅動裝置2之控制電路23係可藉由第一操作期間、第二操作期間及第三操作期間之順序啟動馬達，或者是採取第一操作期間、第三操作期間及第二操作期間之順序啟動馬達。
接著，請參照圖3，以進一步說明本發明之驅動裝置2。
驅動裝置2之控制電路23包括一第五開關單元Q5、一第六開關單元Q6、一第七開關單元Q7、一第八開關單元Q8、一第一電阻器R1、一第二電阻器R2、一第三電阻器R3、一第四電阻器R4、一第五電阻器R5、一第六電阻器R6、一第七電阻器R7、一第八電阻器R8。
第五開關單元Q5係分別與第一控制訊號S1及一接地端電性連接，並依據第一控制訊號S1而導通或截止。第一電阻器R1之一端與保護電路22之第一保護單元D1之一端電性連接，而第一保護單元D1之另一端與輔助電源Vdd
電性連接。第二電阻器R2之一端與第一電阻器R1之另一端電性連接，且第二電阻器R2之另一端與第五開關單元Q5電性連接。第六開關單元Q6分別與第一電阻器R1、第二電阻器R2及儲能電路22之第一電容器C1電性連接。在本實施例中，第五開關單元Q5為一N型金氧半場效電晶體，而第六開關單元Q6為一P型金氧半場效電晶體。
第三電阻器R3之一端與第六開關單元Q6電性連接，且第三電阻器R3之另一端與橋式電路24之第一開關單元Q1之閘極電性連接。第四電阻器R4之一端與第三電阻器R3之另一端電性連接，且第四電阻器R4之另一端與橋式電路24之第一開關單元Q1之源極電性連接。其中，第三電阻器R3與第四電阻器R4係用以調整第一開關單元Q1導通與截止的速度。在實際運用上，第三電阻器R3與第四電阻器R4的選擇需滿足以下之(1)式：
R4/( R3+R4)*Vdd
-V1s
>4V（伏特）
(1)
其中，V1s
係為第一開關單元Q1之源極電壓。
第七開關單元Q7分別與第三控制訊號S3及一接地端電性連接，並依據第三控制訊號S3而導通或截止。第五電阻器R5之一端與保護電路22之第二保護單元D2之一端電性連接，而第二保護單元D2之另一端與輔助電源Vdd
電性連接。第六電阻器R6之一端與第五電阻器R5之另一端電性連接，且第六電阻器R6之另一端與第七開關單元Q7電性連接。第八開關單元Q8分別與第五電阻器R5、第六電阻器R6及儲能電路22之第二電容器C2電性連接。在本實施例中，第七開關單元Q7為一N型金氧半場效電晶體，而第八開關單元Q8為一P型金氧半場效電晶體。
第七電阻器R7之一端與第八開關單元Q8電性連接，且第七電阻器R7之另一端與橋式電路24之第三開關單元Q3之閘極電性連接。第八電阻器R8之一端與第七電阻器R7之另一端電性連接，且第八電阻器R8之另一端與橋式電路24之第三開關單元Q3之源極電性連接。其中，第七電阻器R7與第八電阻器R8係用以調整第三開關單元Q3導通與截止的速度。在實際運用上，第七電阻器R7與第八電阻器R8的選擇需滿足以下之(2)式：
R8/( R7+R8)*Vdd
-V3s
>4V（伏特）
(2)
其中，V3s
係為第三開關單元Q3之源極電壓。
驅動裝置2之橋式電路24之第一開關單元Q1之汲極及第三開關單元Q3之汲極與馬達驅動電源VCC
電性連接。第二開關單元Q2之源極及第四開關單元Q4之源極與接地端電性連接。此外，第二開關單元Q2之閘極與第四開關單元Q4之閘極分別與第二控制訊號S2與第四控制訊號S4電性連接，並分別依據第二控制訊號S2與第四控制訊號S4而導通或截止。
請參照圖4A之流程圖並搭配圖3所示，以說明本發明之較佳實施例之驅動方法，其係可與上述之驅動裝置2搭配使用，而風扇用直流無刷馬達之驅動裝置之驅動方法的步驟係包含步驟S01～步驟S03。另外，為了更清楚地說明本發明之控制電路23之第一開關單元Q1～第八開關單元Q8與第一控制訊號S1～第四控制訊號S4之間的對應關係，請同時參照圖5之狀態示意圖。
步驟S01係於一第一操作期間，分別依據第二控制訊號S2與第四控制訊號S4而導通第二開關單元Q2及第四開關單元Q4，以使儲能電路22於第一操作期間接收輔助電源Vdd
，並儲存該輔助電源Vdd
。
在實際操作上，第二開關單元Q2與第四開關單元Q4係接收高位準之第二控制訊號S2與第四控制訊號S4而導通，輔助電源Vdd
係透過第一保護單元D1及第二保護單元D2而對儲能電路22之第一電容器C1與第二電容器C2進行充電，在此同時，第一控制訊號S1與第三控制訊號S3係為低位準之訊號，因而第一開關單元Q1、第三開關單元Q3及第五開關單元Q5～第八開關單元Q8皆為截止狀態。此外，當第一電容器C1與第二電容器C2所儲存之電位到達輔助電源Vdd
之電位時，進入步驟S02。
步驟S02係於一第二操作期間，分別依據第一控制訊號S1及第四控制訊號S4而導通第一開關單元Q1與第四開關單元Q4。
在實際運用上，由於第五開關單元Q5及第六開關單元Q6分別為N型金氧半場效電晶體與P型金氧半場效電晶體，因此當第一控制訊號S1為高位準時，將同時導通第五開關單元Q5及第六開關單元Q6，並提供第一電容器C1一放電路徑，以將其所儲存之輔助電源Vdd進行放電。此外，由於第三電阻器R3與第四電阻器R4的選擇係滿足上述之(1)式的要求。因此，當第一控制訊號S1為高位準時，將可透過第一電容器C1進行放電以導通第一開關單元Q1。再者，第四開關單元Q4將依據第四控制訊號S4而導通，而使馬達驅動電源VCC通過馬達線圈L，藉此驅動馬達。
另外，在此同時，第二控制訊號S2與第三控制訊號S3係為低位準之訊號，因而第二開關單元Q2、第三開關單元Q3、第七開關單元Q7及第八開關單元Q8皆為截止狀態。
步驟S03係於一第三操作期間，分別依據第二控制訊號S2及第三控制訊號S3而導通第二開關單元Q2與第三開關單元Q3。
在實際操作上，由於第七開關單元Q7及第八開關單元Q8分別為N型金氧半場效電晶體與P型金氧半場效電晶體，因此當第三控制訊號S3為高位準時，將同時導通第七開關單元Q7及第八開關單元Q8，並提供第二電容器C2一放電路徑，以將其所儲存之輔助電源Vdd
進行放電。此外，由於第七電阻器R7與第八電阻器R8的選擇係滿足上述之(2)式的要求。因此，當第三控制訊號S3為高位準時，將可透過第二電容器C2進行放電以導通第三開關單元Q3。再者，第二開關單元Q2將依據第二控制訊號S2而導通，而使馬達驅動電源VCC
通過馬達線圈L，以驅動馬達，在此同時，第一控制訊號S1與第四控制訊號S4係為低位準之訊號，因而第一開關單元Q1、第四開關單元Q4、第五開關單元Q5及第六開關單元Q6皆為截止狀態。
另外，值得一提的是，當透過步驟S01至步驟S03而啟動馬達運轉後，將可藉由不斷重複步驟S02與步驟S03而使馬達持續運轉。然而，若馬達於停止後需重新啟動，則需由步驟S01開始實施。此外，在實際應用上，第一控制訊號S1、第二控制訊號S2、第三控制訊號S3及第四控制訊號S4係為一PWM訊號或一直流電壓訊號。
接著，請參照圖4B之流程圖並搭配圖3所示，本發明之另一種較佳實施例之驅動方法，其係可與上述之驅動裝置2搭配使用，而風扇用直流無刷馬達之驅動裝置之驅動方法的步驟係包含步驟S11至步驟S13。其中，在本實施例中，係以步驟S11、步驟S12及步驟13的順序啟動馬達，並藉由不斷重複步驟S12與步驟S13而使馬達持續運轉。由於步驟S11、步驟S12及步驟S13的技術特徵係與上述實施例之步驟S01、步驟S03及步驟S02相同，故於此不再贅述。
藉由上述的硬體架構及驅動方法，當輔助電源Vdd
之電壓介於4至20伏特時，即可導通第一開關單元Q1與第三開關單元Q3。因而，本發明將具有較大的操作電壓範圍，而可以更廣泛的應用在不同需求及設計之馬達驅動。
綜上所述，因依據本發明之ㄧ種風扇用直流無刷馬達之驅動裝置係藉由儲能電路與控制電路的配合應用，以提供符合導通橋式電路之第一開關單元與第三開關單元所需的電壓準位，從而實現具有簡單結構，並具有較大的操作電壓範圍，進而增加驅動裝置之應用性及馬達之品質的風扇用直流無刷馬達之驅動裝置及其驅動方法。
以上所述僅為舉例性，而非為限制性者。任何未脫離本發明之精神與範疇，而對其進行之等效修改或變更，均應包含於後附之申請專利範圍中。
Hereinafter, a driving device of a DC brushless motor for a fan according to a preferred embodiment of the present invention will be described with reference to the related drawings.
First, please refer to FIG. 2, which is a driving device 2 for a DC brushless motor according to a preferred embodiment of the present invention. The driving device 2 includes a protection circuit 21, a storage circuit 22, a control circuit 23 and a bridge circuit 24.
The protection circuit 21 is electrically connected to an auxiliary power source V dd . In this embodiment, the protection circuit 21 has a first protection unit D1 and a second protection unit D2. In practice, the first protection unit D1 and the second protection unit D2 are respectively a diode.
The energy storage circuit 22 is electrically connected to the protection circuit 21. In this embodiment, the tank circuit 22 has a first capacitor C1 and a second capacitor C2. The first capacitor C1 and the second capacitor C2 are electrically connected to the first protection unit D1 and the second protection unit D2, respectively.
The first protection unit D1 and the second protection unit D2 not only provide a charging path of the first capacitor C1 and the second capacitor C2, but also prevent the voltage from being fed back to the auxiliary power source V dd .
The control circuit 23 is electrically connected to the protection circuit 21 and the storage circuit 22. The control circuit 23 receives a first control signal S1, a second control signal S2, a third control signal S3, and a fourth control signal S4.
The bridge circuit 24 is electrically connected to the control circuit 23. In this embodiment, the bridge circuit 24 has a first switching unit Q1, a second switching unit Q2, a third switching unit Q3, and a fourth switching unit Q4. The first switch unit Q1 to the fourth switch unit Q4 are respectively an N-type metal oxide half field effect transistor. In addition, the source of the first switching unit Q1 and the anode of the second switching unit Q2 are coupled to one end of a motor coil L. The drain of the third switch unit Q3 and the drain of the fourth switch unit Q4 are coupled to the other end of the motor coil L, and the drain of the first switch unit Q1 and the drain of the third switch unit Q3 and a motor drive power supply V CC is electrically connected, and the source of the second switching unit Q2 and the source of the fourth switching unit Q4 are electrically connected to a ground.
In practical operation, the control circuit 23 receives the low level first control signal S1 and the third control signal S3, and the high level second control signal S2 and the fourth control signal S4 during a first operation period, and according to The second control unit S2 and the fourth control signal S4 turn on the second switching unit Q2 and the fourth switching unit Q4, so that the first capacitor C1 and the second capacitor C2 of the tank circuit 22 receive the auxiliary power source V dd and store it. During a second operation, the control circuit 23 receives the high level first control signal S1 and the fourth control signal S4, and the low level second control signal S2 and the third control signal S3, and according to the first control signal S1 and The fourth control signal S4 turns on the first switching unit Q1 and the fourth switching unit Q4. During a third operation, the control circuit 23 receives the low level first control signal S1 and the fourth control signal S4, and the high level second control signal S2 and the third control signal S3, and according to the second control signal S2 and The third control signal S3 turns on the second switching unit Q2 and the third switching unit Q3.
In addition, it is worth mentioning that the control circuit 23 of the driving device 2 can start the motor by the sequence of the first operation period, the second operation period and the third operation period, or take the first operation period and the third operation period. And starting the motor in sequence during the second operation.
Next, please refer to FIG. 3 to further explain the driving device 2 of the present invention.
The control circuit 23 of the driving device 2 includes a fifth switching unit Q5, a sixth switching unit Q6, a seventh switching unit Q7, an eighth switching unit Q8, a first resistor R1, and a second resistor R2. a third resistor R3, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8.
The fifth switch unit Q5 is electrically connected to the first control signal S1 and a ground, and is turned on or off according to the first control signal S1. One end of the first resistor R1 is electrically connected to one end of the first protection unit D1 of the protection circuit 22, and the other end of the first protection unit D1 is electrically connected to the auxiliary power source V dd . One end of the second resistor R2 is electrically connected to the other end of the first resistor R1, and the other end of the second resistor R2 is electrically connected to the fifth switch unit Q5. The sixth switching unit Q6 is electrically connected to the first resistor R1, the second resistor R2, and the first capacitor C1 of the tank circuit 22, respectively. In this embodiment, the fifth switching unit Q5 is an N-type gold-oxygen half field effect transistor, and the sixth switching unit Q6 is a P-type gold-oxygen half field effect transistor.
One end of the third resistor R3 is electrically connected to the sixth switching unit Q6, and the other end of the third resistor R3 is electrically connected to the gate of the first switching unit Q1 of the bridge circuit 24. One end of the fourth resistor R4 is electrically connected to the other end of the third resistor R3, and the other end of the fourth resistor R4 is electrically connected to the source of the first switching unit Q1 of the bridge circuit 24. The third resistor R3 and the fourth resistor R4 are used to adjust the speed at which the first switching unit Q1 is turned on and off. In practical use, the selection of the third resistor R3 and the fourth resistor R4 must satisfy the following formula (1):
R4/( R3+R4)*V dd -V 1s >4V (volts) (1)
Wherein, V 1s is the source voltage of the first switching unit Q1.
The seventh switch unit Q7 is electrically connected to the third control signal S3 and a ground, and is turned on or off according to the third control signal S3. One end of the fifth resistor R5 is electrically connected to one end of the second protection unit D2 of the protection circuit 22, and the other end of the second protection unit D2 is electrically connected to the auxiliary power source V dd . One end of the sixth resistor R6 is electrically connected to the other end of the fifth resistor R5, and the other end of the sixth resistor R6 is electrically connected to the seventh switch unit Q7. The eighth switching unit Q8 is electrically connected to the fifth resistor R5, the sixth resistor R6, and the second capacitor C2 of the tank circuit 22, respectively. In this embodiment, the seventh switching unit Q7 is an N-type gold-oxygen half field effect transistor, and the eighth switching unit Q8 is a P-type gold-oxygen half field effect transistor.
One end of the seventh resistor R7 is electrically connected to the eighth switching unit Q8, and the other end of the seventh resistor R7 is electrically connected to the gate of the third switching unit Q3 of the bridge circuit 24. One end of the eighth resistor R8 is electrically connected to the other end of the seventh resistor R7, and the other end of the eighth resistor R8 is electrically connected to the source of the third switching unit Q3 of the bridge circuit 24. The seventh resistor R7 and the eighth resistor R8 are used to adjust the speed at which the third switching unit Q3 is turned on and off. In practical use, the selection of the seventh resistor R7 and the eighth resistor R8 must satisfy the following formula (2):
R8/( R7+R8)*V dd -V 3s >4V (volts) (2)
Wherein, V 3s is the source voltage of the third switching unit Q3.
The drain of the first switching unit Q1 of the bridge circuit 24 of the driving device 2 and the drain of the third switching unit Q3 are electrically connected to the motor driving power source V CC . The source of the second switching unit Q2 and the source of the fourth switching unit Q4 are electrically connected to the ground. In addition, the gate of the second switching unit Q2 and the gate of the fourth switching unit Q4 are electrically connected to the second control signal S2 and the fourth control signal S4, respectively, according to the second control signal S2 and the fourth control signal S4, respectively. Turn on or off.
Referring to the flowchart of FIG. 4A and FIG. 3, the driving method of the preferred embodiment of the present invention can be used in combination with the above-mentioned driving device 2, and the driving device of the DC brushless motor for the fan is used. The steps of the driving method include steps S01 to S03. In addition, in order to more clearly explain the correspondence between the first to eighth switch units Q1 to Q8 of the control circuit 23 of the present invention and the first to fourth control signals S1 to S4, please refer to the state of FIG. schematic diagram.
Step S01 is to turn on the second switching unit Q2 and the fourth switching unit Q4 according to the second control signal S2 and the fourth control signal S4, respectively, during a first operation, so that the energy storage circuit 22 receives the assistance during the first operation. The power supply V dd and the auxiliary power supply V dd is stored.
In actual operation, the second switching unit Q2 and the fourth switching unit Q4 receive the high level second control signal S2 and the fourth control signal S4, and the auxiliary power source V dd is transmitted through the first protection unit D1 and the second protection. The first capacitor C1 and the second capacitor C2 of the energy storage circuit 22 are charged by the unit D2. At the same time, the first control signal S1 and the third control signal S3 are low level signals, and thus the first switching unit Q1. The third switching unit Q3 and the fifth switching unit Q5 to the eighth switching unit Q8 are all in an off state. Further, when the potential stored by the first capacitor C1 and the second capacitor C2 reaches the potential of the auxiliary power source V dd , the process proceeds to step S02.
Step S02 is to turn on the first switching unit Q1 and the fourth switching unit Q4 according to the first control signal S1 and the fourth control signal S4 respectively during a second operation.
In practical application, since the fifth switching unit Q5 and the sixth switching unit Q6 are respectively an N-type MOS field effect transistor and a P-type MOS half-field effect transistor, when the first control signal S1 is at a high level, The fifth switching unit Q5 and the sixth switching unit Q6 are turned on, and a discharge path of the first capacitor C1 is provided to discharge the auxiliary power supply Vdd stored therein. Further, since the selection of the third resistor R3 and the fourth resistor R4 satisfies the requirements of the above formula (1). Therefore, when the first control signal S1 is at a high level, the first capacitor C1 can be discharged to turn on the first switching unit Q1. Furthermore, the fourth switching unit Q4 is turned on according to the fourth control signal S4, and the motor driving power source VCC is passed through the motor coil L, thereby driving the motor.
In addition, at the same time, the second control signal S2 and the third control signal S3 are low level signals, and thus the second switching unit Q2, the third switching unit Q3, the seventh switching unit Q7 and the eighth switching unit Q8 are Cutoff status.
Step S03 is to turn on the second switching unit Q2 and the third switching unit Q3 according to the second control signal S2 and the third control signal S3, respectively, during a third operation.
In practical operation, since the seventh switching unit Q7 and the eighth switching unit Q8 are respectively an N-type MOSFET and a P-type MOS field-effect transistor, when the third control signal S3 is at a high level, The seventh switching unit Q7 and the eighth switching unit Q8 are turned on, and a discharging path of the second capacitor C2 is provided to discharge the auxiliary power source V dd stored therein. Further, since the selection of the seventh resistor R7 and the eighth resistor R8 satisfies the requirements of the above formula (2). Therefore, when the third control signal S3 is at a high level, the second capacitor C2 can be discharged to turn on the third switching unit Q3. Furthermore, the second switching unit Q2 is turned on according to the second control signal S2, and the motor driving power source V CC is passed through the motor coil L to drive the motor. At the same time, the first control signal S1 and the fourth control signal S4 are The signal is a low level, and thus the first switching unit Q1, the fourth switching unit Q4, the fifth switching unit Q5, and the sixth switching unit Q6 are all in an off state.
In addition, it is worth mentioning that after the motor operation is started through steps S01 to S03, the motor can be continuously operated by continuously repeating steps S02 and S03. However, if the motor needs to be restarted after stopping, it is necessary to start the operation in step S01. In addition, in practical applications, the first control signal S1, the second control signal S2, the third control signal S3, and the fourth control signal S4 are a PWM signal or a DC signal.
Next, referring to the flowchart of FIG. 4B and in conjunction with FIG. 3, the driving method of another preferred embodiment of the present invention can be used with the above-mentioned driving device 2, and the fan is driven by a DC brushless motor. The steps of the driving method of the device include steps S11 to S13. In the present embodiment, the motor is started in the order of step S11, step S12, and step 13, and the motor is continuously operated by continuously repeating steps S12 and S13. The technical features of the step S11, the step S12, and the step S13 are the same as the steps S01, S03, and S02 of the foregoing embodiment, and thus are not described herein again.
With the above hardware architecture and driving method, when the voltage of the auxiliary power source V dd is between 4 and 20 volts, the first switching unit Q1 and the third switching unit Q3 can be turned on. Thus, the present invention will have a larger operating voltage range and be more widely applicable to motor drives of different needs and designs.
In summary, the driving device of the DC brushless motor for a fan according to the present invention is provided by the combination of the energy storage circuit and the control circuit to provide the first switching unit and the third switch complying with the conduction bridge circuit. The voltage level required by the unit, thereby realizing a driving device for a DC brushless motor for a fan having a simple structure and having a large operating voltage range, thereby increasing the applicability of the driving device and the quality of the motor, and a driving method thereof.
The above is intended to be illustrative only and not limiting. Any equivalent modifications or alterations to the spirit and scope of the invention are intended to be included in the scope of the appended claims.
1A、1B、2‧‧‧驅動裝置1A, 1B, 2‧‧‧ drive
21‧‧‧保護電路21‧‧‧Protection circuit
22‧‧‧儲能電路22‧‧‧storage circuit
23‧‧‧控制電路23‧‧‧Control circuit
24‧‧‧橋式電路24‧‧‧Bridge Circuit
C1‧‧‧第一電容器C1‧‧‧First Capacitor
C2‧‧‧第二電容器C2‧‧‧second capacitor
D1‧‧‧第一保護單元D1‧‧‧ first protection unit
D2‧‧‧第二保護單元D2‧‧‧Second protection unit
L‧‧‧馬達線圈L‧‧‧Motor coil
Q1‧‧‧第一開關單元Q1‧‧‧First switch unit
Q2‧‧‧第二開關單元Q2‧‧‧Second switch unit
Q3‧‧‧第三開關單元Q3‧‧‧third switch unit
Q4‧‧‧第四開關單元Q4‧‧‧fourth switch unit
Q5‧‧‧第五開關單元Q5‧‧‧ fifth switch unit
Q6‧‧‧第六開關單元Q6‧‧‧ sixth switch unit
Q7‧‧‧第七開關單元Q7‧‧‧ seventh switch unit
Q8‧‧‧第八開關單元Q8‧‧‧ eighth switch unit
R1‧‧‧第一電阻器R1‧‧‧ first resistor
R2‧‧‧第二電阻器R2‧‧‧second resistor
R3‧‧‧第三電阻器R3‧‧‧ third resistor
R4‧‧‧第四電阻器R4‧‧‧ fourth resistor
R5‧‧‧第五電阻器R5‧‧‧ fifth resistor
R6‧‧‧第六電阻器R6‧‧‧ sixth resistor
R7‧‧‧第七電阻器R7‧‧‧ seventh resistor
R8‧‧‧第八電阻器R8‧‧‧ eighth resistor
S01~S03、S11~S13‧‧‧驅動方法的步驟Steps of S01~S03, S11~S13‧‧‧ drive method
S1‧‧‧第一控制訊號S1‧‧‧ first control signal
S2‧‧‧第二控制訊號S2‧‧‧second control signal
S3‧‧‧第三控制訊號S3‧‧‧ third control signal
S4‧‧‧第四控制訊號S4‧‧‧ fourth control signal
Vcc ‧‧‧馬達驅動電源V cc ‧‧‧Motor drive power supply
Vdd ‧‧‧輔助電源V dd ‧‧‧Auxiliary power supply
圖1A及圖1B為習知之一種風扇用直流無刷馬達之驅動裝置的示意圖；
圖2為依據本發明較佳實施例之一種風扇用直流無刷馬達之驅動裝置的示意圖；
圖3為依據本發明較佳實施例之一種風扇用直流無刷馬達之驅動裝置的示意圖；
圖4A為依據本發明較佳實施例之驅動裝置的驅動方法之一流程圖；
圖4B為依據本發明較佳實施例之驅動裝置的另一種驅動方法之一流程圖；以及
圖5為依據本發明較佳實施例之控制電路之開關單元與控制訊號之間狀態示意圖。
1A and 1B are schematic views of a conventional DC brushless motor driving device for a fan;
2 is a schematic view showing a driving device of a DC brushless motor for a fan according to a preferred embodiment of the present invention;
3 is a schematic view of a driving device for a DC brushless motor for a fan according to a preferred embodiment of the present invention;
4A is a flow chart showing a driving method of a driving device according to a preferred embodiment of the present invention;
4B is a flow chart showing another driving method of the driving device according to the preferred embodiment of the present invention; and FIG. 5 is a schematic diagram showing the state between the switching unit and the control signal of the control circuit according to the preferred embodiment of the present invention.
2‧‧‧驅動裝置 2‧‧‧ drive
21‧‧‧保護電路 21‧‧‧Protection circuit
22‧‧‧儲能電路 22‧‧‧storage circuit
23‧‧‧控制電路 23‧‧‧Control circuit
24‧‧‧橋式電路 24‧‧‧Bridge Circuit
C1‧‧‧第一電容器 C1‧‧‧First Capacitor
C2‧‧‧第二電容器 C2‧‧‧second capacitor
D1‧‧‧第一保護單元 D1‧‧‧ first protection unit
D2‧‧‧第二保護單元 D2‧‧‧Second protection unit
L‧‧‧馬達線圈 L‧‧‧Motor coil
Q1‧‧‧第一開關單元 Q1‧‧‧First switch unit
Q2‧‧‧第二開關單元 Q2‧‧‧Second switch unit
Q3‧‧‧第三開關單元 Q3‧‧‧third switch unit
Q4‧‧‧第四開關單元 Q4‧‧‧fourth switch unit
S1‧‧‧第一控制訊號 S1‧‧‧ first control signal
S2‧‧‧第二控制訊號 S2‧‧‧second control signal
S3‧‧‧第三控制訊號 S3‧‧‧ third control signal
S4‧‧‧第四控制訊號 S4‧‧‧ fourth control signal
VCC‧‧‧馬達驅動電源 V CC ‧‧‧Motor drive power supply
Vdd‧‧‧輔助電源 V dd ‧‧‧Auxiliary power supply
Claims (12)
一保護電路，與一輔助電源電性連接；
一儲能電路，與該保護電路電性連接；
一控制電路，與該保護電路及該儲能電路電性連接，該控制電路並分別接收一第一控制訊號、一第二控制訊號、一第三控制訊號及一第四控制訊號；以及
一橋式電路，與該控制電路電性連接，該橋式電路具有一第一開關單元、一第二開關單元、一第三開關單元及一第四開關單元，該第一開關單元與該第二開關單元與一馬達線圈之一端耦接，該第三開關單元與該第四開關單元與該馬達線圈之另一端耦接，且該第一開關單元與該第三開關單元電性連接，該第二開關單元與該第四開關單元電性連接，
其中該控制電路於一第一操作期間，導通該第二開關單元與該第四開關單元，於一第二操作期間，導通該第一開關單元與該第四開關單元，並於一第三操作期間，導通該第二開關單元與該第三開關單元，且該儲能電路於該第一操作期間接收該輔助電源。A driving device for a DC brushless motor for a fan, comprising:
a protection circuit electrically connected to an auxiliary power source;
a storage circuit electrically connected to the protection circuit;
a control circuit electrically connected to the protection circuit and the energy storage circuit, the control circuit respectively receiving a first control signal, a second control signal, a third control signal and a fourth control signal; and a bridge The circuit is electrically connected to the control circuit, the bridge circuit has a first switch unit, a second switch unit, a third switch unit and a fourth switch unit, the first switch unit and the second switch unit Coupling with one end of a motor coil, the third switch unit and the fourth switch unit are coupled to the other end of the motor coil, and the first switch unit is electrically connected to the third switch unit, the second switch The unit is electrically connected to the fourth switch unit,
The control circuit turns on the second switch unit and the fourth switch unit during a first operation, and turns on the first switch unit and the fourth switch unit during a second operation, and performs a third operation. During the period, the second switching unit and the third switching unit are turned on, and the energy storage circuit receives the auxiliary power source during the first operation.
一第五開關單元，與該第一控制訊號電性連接；
一第一電阻器，其一端與該保護電路電性連接；
一第二電阻器，其一端與該第一電阻器電性連接，而另一端與該第五開關單元電性連接；
一第六開關單元，分別與該第一電阻器、該第二電阻器及該儲能電路電性連接；
一第三電阻器，其一端與該第六開關單元電性連接，而該第三電阻器之另一端與該橋式電路之該第一開關單元電性連接；
一第四電阻器，其一端與該第三電阻器之另一端電性連接，而該第四電阻器之另一端與該橋式電路之該第一開關單元之一端電性連接；
一第七開關單元，與該第三控制訊號電性連接；
一第五電阻器，其一端與該保護電路電性連接；
一第六電阻器，其一端與該第五電阻器電性連接，而另一端與該第七開關單元電性連接；
一第八開關單元，分別與該第五電阻器、該第六電阻器及該儲能電路電性連接；
一第七電阻器，其一端與該第八開關單元電性連接，而該第七電阻器之另一端與該橋式電路之該第三開關單元電性連接；以及
一第八電阻器，其一端與該第七電阻器之另一端電性連接，而該第八電阻器之另一端與該橋式電路之該第三開關單元之一端電性連接。The driving device of claim 1, wherein the control circuit comprises:
a fifth switch unit electrically connected to the first control signal;
a first resistor, one end of which is electrically connected to the protection circuit;
a second resistor, one end of which is electrically connected to the first resistor, and the other end is electrically connected to the fifth switch unit;
a sixth switching unit electrically connected to the first resistor, the second resistor and the energy storage circuit;
a third resistor, one end of which is electrically connected to the sixth switch unit, and the other end of the third resistor is electrically connected to the first switch unit of the bridge circuit;
a fourth resistor, one end of which is electrically connected to the other end of the third resistor, and the other end of the fourth resistor is electrically connected to one end of the first switching unit of the bridge circuit;
a seventh switching unit electrically connected to the third control signal;
a fifth resistor, one end of which is electrically connected to the protection circuit;
a sixth resistor, one end of which is electrically connected to the fifth resistor, and the other end is electrically connected to the seventh switch unit;
An eighth switch unit electrically connected to the fifth resistor, the sixth resistor, and the energy storage circuit;
a seventh resistor, one end of which is electrically connected to the eighth switching unit, and the other end of the seventh resistor is electrically connected to the third switching unit of the bridge circuit; and an eighth resistor, One end is electrically connected to the other end of the seventh resistor, and the other end of the eighth resistor is electrically connected to one end of the third switching unit of the bridge circuit.
於一第一操作期間，分別依據該第二控制訊號與該第四控制訊號而導通該第二開關單元及該第四開關單元，以使該儲能電路於該第一操作期間接收該輔助電源，並儲存之，並進入一第二操作期間及一第三操作期間其中之一；
於該第二操作期間，分別依據該第一控制訊號及該第四控制訊號而導通該第一開關單元與該第四開關單元，並進入該第三操作期間；以及
於該第三操作期間，分別依據該第二控制訊號及該第三控制訊號而導通該第二開關單元與該第三開關單元，並進入該第二操作期間。A driving method of a DC brushless motor for a fan is used in combination with a driving device, wherein the driving device has a protection circuit, a storage circuit, a control circuit and a bridge circuit, and the protection circuit and an auxiliary power supply are electrically connected. Connecting, the energy storage circuit is electrically connected to the protection circuit, the control circuit is electrically connected to the protection circuit and the energy storage circuit, and respectively receives a first control signal, a second control signal, and a third control signal And a fourth control signal, the bridge circuit is electrically connected to the control circuit, and the bridge circuit has a first switch unit, a second switch unit, a third switch unit and a fourth switch unit, wherein The first switch unit and the second switch unit are coupled to one end of the motor, the third switch unit and the fourth switch unit are coupled to the other end of the motor, and the first switch unit and the third switch The unit is electrically connected, and the second switch unit is electrically connected to the fourth switch unit, and the driving method includes:
During the first operation, the second switching unit and the fourth switching unit are turned on according to the second control signal and the fourth control signal, respectively, so that the energy storage circuit receives the auxiliary power during the first operation. And storing and entering one of a second operation period and a third operation period;
During the second operation, the first switching unit and the fourth switching unit are turned on according to the first control signal and the fourth control signal, respectively, and enter the third operation period; and during the third operation period, The second switch unit and the third switch unit are turned on according to the second control signal and the third control signal, respectively, and enter the second operation period.
The driving method of claim 10, wherein the auxiliary power source has a voltage of 4 to 20 volts.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW99131783A TWI426696B (en) | 2010-09-20 | 2010-09-20 | Driving device of brushless dc motor for fan and driving method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW99131783A TWI426696B (en) | 2010-09-20 | 2010-09-20 | Driving device of brushless dc motor for fan and driving method thereof |
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| Publication Number | Publication Date |
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| TW201214945A TW201214945A (en) | 2012-04-01 |
| TWI426696B true TWI426696B (en) | 2014-02-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| TW99131783A TWI426696B (en) | 2010-09-20 | 2010-09-20 | Driving device of brushless dc motor for fan and driving method thereof |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200726059A (en) * | 2005-12-23 | 2007-07-01 | Delta Electronics Inc | Fan system and real-time stopping device thereof |
| TW200803143A (en) * | 2006-06-12 | 2008-01-01 | Anpec Electronics Corp | Full bridge circuit and DC motor capable of fixing output voltage and avoiding reverse current |
-
2010
- 2010-09-20 TW TW99131783A patent/TWI426696B/en active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TW200726059A (en) * | 2005-12-23 | 2007-07-01 | Delta Electronics Inc | Fan system and real-time stopping device thereof |
| TW200803143A (en) * | 2006-06-12 | 2008-01-01 | Anpec Electronics Corp | Full bridge circuit and DC motor capable of fixing output voltage and avoiding reverse current |
Also Published As
| Publication number | Publication date |
|---|---|
| TW201214945A (en) | 2012-04-01 |
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