200816604 九、發明說明： 【發明所屬之技術領域】 本發明係-種降低運轉電磁嗓音之無刷馬達驅動電路及其方法，其係 特別關於—種之糊時間電壓數位類比轉換器輸出之線性訊號，來推動無 魏置，以降低運觀磁噪音之降低_電_音之^馬達驅動電 路及其方法。 【先前技術】 無刷馬達（霍爾馬達）又稱作直流伺服馬達(DC serv〇 m〇t〇r),無刷 馬達在構造上是糊永久韻作為轉子，並且__效域應電動機轉 子的位置’無刷馬達裝置由於·霍_楊缝激卿序鱗間，因此又 稱作「電子換相馬達」，利用霍爾元件感應激磁順序與時間可以減少不必要 的電能浪費’同時也可以適時的提供轉子轉動所需的電磁力，因此大幅提 升馬達輸出扭矩與效率。 但’實際應用時’由於霍爾元件感測到之信號過小，—般放大器無法 準確將之等比例放大，原因在於無法移除HaU piate以及量測放大器 (instrumentation amplifier)^#t^ (〇ffSet-voltage) 截皮放大器(chopper amplifler)之架構，而截波放大器通常在操作鮮 上又又到限制’對於無刷騎m言，—旦轉速較高，就無法將磁場變 L 5虎作有相還原並提供給無刷馬達裝置作為換相過程巾之驅動電壓， 因而容易造成因力矩變化速率過大，而產生較大之電磁噪音。 為此本發明提出一種降低運轉電磁噪音之無刷馬達驅動電路及其方 5 200816604 法，以改善上述缺失。 【發明内容】 及盆:===在提供—種降低運轉辆噪音之無刷馬達驅動電路 姐紐Γ (蝴貞™)⑽錄，以訊號處理 ==雜變化之驅動龍，使得切換無刷馬魏置時力矩·速度較 則錢㈣，⑽咖，嫩置之轉電磁啤音。 及=發明之另—目的在提供—種降低運轉電磁噪音之無刷馬達驅動電路 八法，其係可調整時間電壓數位類比轉換器内之第-磁場值及該第二 磁場值，以改變無刷馬魏置之換相速率。 本發明係提供—種降低運轉電磁噪音之無刷馬達驅動電路及其方法， 其係利用至少-磁場偵測電路，_無刷樓置之磁場週期變化，並產 生偵測域’再以至少-計數器與磁場偵測電路連接，用計數器累計磁場 變化時，上升訊號之磁場變化時間與下降訊號之磁場變化時間；與計數器 連之錢處理0，可將上升職磁場變化時間及下降訊麵場變化時間 刀為複數伽，根據_l升訊號磁場變化咖、下降訊號磁場變化時 間及_錄’產生並輸出相對叙_上升峨錢及線性下降訊號； 此二組線性訊號輸出至與無，達健連接之職，可使得切換無刷 馬達裝置時力矩變化速度較先前技術更解緩，藉崎低無刷馬達裝置之 運轉電磁嚼音’且可調整時間電壓數位類比轉換器内之—第—磁場值及一 第二磁場值來改變換相之速率。 底下藉由具體實施例配合所附的圖式詳加說明，當更容易瞭解本發明 200816604 之目的、技術内容、特點及其所達成之功效。 【實施方式】 器18，如須推動等效負餘A之無刷馬達裝置22，可再透過—單位增益 (unit 之電壓緩_ (她age buffer)來推動無刷馬達裝置: 以下繼續介紹時間電壓數位類比轉換器12輸出線性訊號給驅動電路卻的 方式。 請參照第-圖，首先介紹本發明之低運轉電磁。桑音之無刷馬達驅動電 路，其係由-時間電壓數位類比轉換器12與—驅動電路2g連接，⑼電 壓數位類_難12可輸城測得知並經過處理後之線性訊號給轉魏 20 ’利用線性訊號控制無刷馬達裝置四降低運轉電磁噪音。時 類比轉換器12内含至少-磁場偵測電路14、至少―計數器16及訊號處理 時間電壓數位類比轉換器12之至少—磁場偵測電路14，此磁測電 路14係為-霍爾元件’磁場偵測電路14偵測無刷馬達裝置22之磁場職 變化’並發出-偵測信號；如第二圖所示，其中磁場偵測電路14可測得磁 场週期值之最大值、第-磁場值(跑）、G、第二磁場值(她_)、最小值， 第-磁場録磁場聊值之最大值與〇之間，第二磁場值係磁場聊值之〇 與最小值之間。另外複數個磁場_電路14，可偵測該第—磁場值及横測 第二磁場值。 時間電壓數位類比轉換器12之至少一計數器16，與磁場偵測電路14 連接’计數器16係用來累計無刷馬達裝置22換相時間，上升訊號之磁場 變化時間與下降訊號之磁場變化時間。如第二圖所示，其中上升訊號係用 200816604 以計舁磁場由第二磁場值變化至第一磁場值之時間 時間電壓數位類比轉換器12之至少—訊號處理器18，與計數器16連 接，訊號處理器18可將計數器16累計之上升訊號磁場變化時間及下降訊 號磁場變化時間分為複數(N)個時間區段，N為―正整數，且根據上升訊號 磁域化時間及下降訊號磁場變化時間及侧信號，產生並輸⑽目對應之 一線性上升職㈣及-雜下降贼，輸以雜上雜舰號及線性 下降訊號訊號則如第三圖所示。 承上所述，訊號處理器18處理下降訊號的方式，係將該下降訊號之磁 場變化時間區分為N個時段，每—時段所對應之下降訊號轉換為—步階下 降波形訊號’再將每-步階波職I⑽後成為躲下降碱。訊號處理 益18處理上升訊號的方式’係、將該上升訊號之磁場變化時間區分為n個時 段’每-時段所對應之上升訊__—步階上升波形訊號，再將每一步 P白波形afl號累计後成為線性下降訊號。 日守間電壓數位類比轉換器12之訊號處理器18與驅動電路2〇，經訊號 處理器18處理後之線性下降訊號及線性上升訊號，可輸出至_驅動電路 20、鶴電路2G X與細馬猶£22;本發储轉化下降喊及上升訊 就為線|±下降為纽雜上升職，购無·達裝置，轉低運轉過 程中產生之電磁噪音。 本發明轉齡性下_狀雜上载齡鶴無，賴置22相較 於先刚技術’ w參照第二圖所示；霍爾元件感應狀磁場變化b，磁場值〇 P為最佳換她。先前技術是在最佳換她讀位方錢行祕，而此種 200816604 換方式θ使無刷馬達裝置22轉動力矩變化速度太快，產生較大之電磁噪 γ為此柄⑽時間電壓數位類比轉換器根據前—個上升訊號之磁場 變化時間或下降成叙磁場變㈣間絲準，從本次換相起始關始計算 丄過時間之錄，分別產生線性上升訊號信號及線性下降訊號，並用此二 組線性變化之電壓驅動無刷馬達裝置22。 〜 在此強調-點，磁場_電路14於無刷馬達裝置22磁場介於第一磁 場值與第二磁場值之間時偵_無刷馬達裝置22之磁場週期變化；因此， 調玉第购值及第二磁場值來改變該無刷馬達裝置^之換相速率。 唯以上所述者，僅為本發明之健實_而已，並_來限林發明實施 之範圍。故即凡依本發日种請顧所述之形狀、構造、特徵及精神所為之 均等變化或修飾，均應包括於本發明之申請專纖_。 【圖式簡單說明】 第-圖係本發明之低運轉電轉音之無刷馬達驅動電路之方塊示意圖。 第二圖係本發明之時脈數據圖。 第三圖係本發明之計數器及線性訊號之局部放大時脈數據圖。 【主要元件符號說明】 12時間電壓數位類比轉換器 14磁場偵測電路 W計數器 訊號處理器 20驅動電路 22無刷馬達裝置200816604 IX. Description of the invention: [Technical field of the invention] The present invention relates to a brushless motor driving circuit for reducing operating electromagnetic noise and a method thereof, which are particularly related to a linear signal of a paste time-voltage digital analog converter output In order to promote the reduction of the magnetic noise, the motor drive circuit and its method are reduced. [Prior Art] Brushless motor (Hall motor) is also called DC servo motor (DC serv〇m〇t〇r), brushless motor is constructed as a permanent magnet as a rotor, and __effect should be motor rotor The location of the 'brushless motor device' is due to the fact that the Huo-Yang seam is in the order of the scale, so it is also called the "electronic commutation motor". Using the Hall element to sense the excitation sequence and time can reduce the unnecessary waste of electric energy. The electromagnetic force required for the rotation of the rotor is provided at the right time, thus greatly increasing the output torque and efficiency of the motor. However, in the 'real application', since the signal sensed by the Hall element is too small, the amplifier cannot accurately scale it up because the HaU piate and the instrumentation amplifier cannot be removed ^#t^ (〇ffSet -voltage) Chopper amplifler architecture, and the chopper amplifier is usually limited in operation and is limited to the brushless ride. If the speed is high, the magnetic field cannot be changed. The phase is reduced and supplied to the brushless motor device as the driving voltage of the commutation process towel, so that the rate of change of the torque is excessively large, and a large electromagnetic noise is generated. To this end, the present invention proposes a brushless motor drive circuit that reduces operating electromagnetic noise and its method 5,018,604 to improve the above-mentioned deficiency. [Summary of the Invention] and the basin: === In the provision of a brushless motor drive circuit that reduces the noise of the running vehicle, the sister-in-law (ButterflyTM) (10) is recorded, and the signal processing == miscellaneous change of the driving dragon makes the switching brushless When Ma Wei sets the torque, the speed is better than the money (four), (10) coffee, tender and turn the electromagnetic beer sound. And another object of the invention is to provide a method for reducing the operating electromagnetic noise of a brushless motor driving circuit, which can adjust the first magnetic field value and the second magnetic field value in the time-voltage digital analog converter to change none. The commutation rate of the brush. The invention provides a brushless motor driving circuit and a method thereof for reducing operating electromagnetic noise, which utilize at least a magnetic field detecting circuit, a magnetic field period change of a brushless floor, and a detection domain 'to be at least- The counter is connected to the magnetic field detecting circuit. When the counter accumulates the magnetic field change, the magnetic field change time of the rising signal and the magnetic field change time of the falling signal; and the counter processing the money processing 0, the rising magnetic field change time and the falling signal field change The time knife is a complex gamma, according to the _l rising signal magnetic field change coffee, the falling signal magnetic field change time and the _ recording' generation and output relative 〗 〖 increase money and linear decline signal; the two sets of linear signals output to and without, Dajian The connection position can make the torque change speed slower than the prior art when switching the brushless motor device, and the electromagnetic chewing sound of the low-brushless motor device can be adjusted and the time-frequency digital analog converter can be adjusted. The value and a second magnetic field value change the rate of the commutation. The purpose, technical content, features, and effects achieved by the present invention 200816604 will be more readily understood by the detailed description of the specific embodiments and the accompanying drawings. [Embodiment] The device 18, such as the brushless motor device 22 that is required to push the equivalent negative residual A, can re-transmit the unity gain (the unit's voltage buffer _ (herage buffer) to push the brushless motor device: The manner in which the voltage digital analog converter 12 outputs a linear signal to the driving circuit. Referring to the first-figure, the low-operation electromagnetic of the present invention is first introduced. The Sansheng's brushless motor driving circuit is a time-time digital analog converter. 12 and - drive circuit 2g connection, (9) voltage digital class _ difficult 12 can be transmitted to the city to detect and processed linear signal to turn Wei 20 'Use linear signal control brushless motor device four to reduce operating electromagnetic noise. Time analog conversion The device 12 includes at least a magnetic field detecting circuit 14, at least a counter 16 and at least a magnetic field detecting circuit 14 of the signal processing time voltage digital analog converter 12. The magnetic circuit 14 is a - Hall element 'magnetic field detecting The circuit 14 detects the magnetic field change of the brushless motor device 22 and emits a detection signal; as shown in the second figure, the magnetic field detecting circuit 14 can measure the maximum value of the magnetic field period value, the first magnetic The value (run), G, the second magnetic field value (her _), the minimum value, the maximum value of the first magnetic field recording magnetic field and the 〇, and the second magnetic field value is between the 〇 and the minimum value of the magnetic field chat value. In addition, a plurality of magnetic field_circuits 14 can detect the first magnetic field value and the second magnetic field value. The at least one counter 16 of the time voltage digital analog converter 12 is connected to the magnetic field detecting circuit 14 'counter 16 system It is used to accumulate the commutation time of the brushless motor device 22, the magnetic field change time of the rising signal and the magnetic field change time of the falling signal. As shown in the second figure, the rising signal is used by the 200816604 to calculate the magnetic field from the second magnetic field value to The time value of the first magnetic field value is at least the signal processor 18, and the signal processor 18 is connected to the counter 16. The signal processor 18 can divide the rising signal magnetic field change time and the falling signal magnetic field change time accumulated by the counter 16 into plural numbers. (N) time period, N is a positive integer, and according to the rising signal magnetic domain time and the falling signal magnetic field change time and side signal, generate and lose (10) the corresponding linear linear rise (4) and - miscellaneous The thief, the miscellaneous miscellaneous ship number and the linear descent signal signal are as shown in the third figure. As described above, the signal processor 18 processes the descent signal by dividing the magnetic field change time of the descent signal into N. During each time period, the falling signal corresponding to each time period is converted into a step-down waveform signal, and then each step-by-step I (10) becomes a falling-down alkali. The signal processing benefits 18 to process the rising signal' The time of the magnetic field change of the signal is divided into n time periods 'the rising signal corresponding to each time period __—step rising waveform signal, and then each step P white waveform afl number is accumulated to become a linear falling signal. The signal processor 18 and the driving circuit 2 of the converter 12, the linear descent signal and the linear rising signal processed by the signal processor 18 can be output to the _ drive circuit 20, the crane circuit 2G X and the fine horse. The decline in storage and conversion and the rise of the news is the line | ± down to the New Miscellaneous, the purchase of non-devices, the electromagnetic noise generated during the operation. The invention has the age-old _-like mixed-age cranes, and the 22-phase is compared with the first-technical technology' w as shown in the second figure; the Hall element induces a magnetic field change b, and the magnetic field value 〇P is the best for her. . The prior art is the best way to change her reading position, and this 200816604 change mode θ causes the brushless motor device 22 to change the rotational torque too fast, resulting in a large electromagnetic noise γ for this handle (10) time voltage digital analogy The converter generates a linear rising signal signal and a linear falling signal according to the time of the change of the magnetic field of the previous rising signal or the falling of the magnetic field (four), from the beginning of the commutation. The brushless motor unit 22 is driven by the two sets of linearly varying voltages. ~ In this case, the magnetic field_circuit 14 detects the magnetic field period of the brushless motor device 22 when the magnetic field of the brushless motor device 22 is between the first magnetic field value and the second magnetic field value; therefore, the adjustment of the jade is purchased. The value and the second magnetic field value change the commutation rate of the brushless motor device. The above is only the health of the present invention, and is limited to the scope of the invention. Therefore, any changes or modifications to the shape, structure, characteristics and spirit of the above-mentioned types of applications should be included in the application for the invention. BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a block diagram showing a brushless motor drive circuit of a low-operation electro-acoustic sound according to the present invention. The second figure is a clock data diagram of the present invention. The third figure is a partial enlarged clock data diagram of the counter and the linear signal of the present invention. [Main component symbol description] 12-time voltage digital analog converter 14 Magnetic field detection circuit W counter Signal processor 20 drive circuit 22 Brushless motor device