TWI672974B - Parallel led current-blancing circuit of motor driving system - Google Patents
Parallel led current-blancing circuit of motor driving system Download PDFInfo
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Abstract
本發明公開一種馬達驅動系統的並聯LED均流電路，其包括彼此並聯的至少二LED電路、輸入電源、開關元件、二極體及馬達驅動電路。各LED電路包括發光二極體及與發光二極體串聯的均流元件，且均流元件的一端連接於發光二極體的負極。輸入電源連接於各發光二極體的正極。開關元件一端連接於各均流元件的另一端，開關元件另一端接地。二極體一端連接於輸入電源，二極體另一端連接於開關元件的一端，而與至少二LED電路並聯。馬達驅動電路具有第一驅動端及接地端，第一驅動端連接開關元件的控制端，並輸出第一驅動訊號，接地端連接於開關元件的另一端。 The invention discloses a parallel LED current sharing circuit of a motor drive system, which comprises at least two LED circuits, an input power source, a switching element, a diode body and a motor drive circuit connected in parallel with each other. Each of the LED circuits includes a light emitting diode and a current sharing element connected in series with the light emitting diode, and one end of the current sharing element is connected to the negative electrode of the light emitting diode. The input power source is connected to the anode of each of the light emitting diodes. One end of the switching element is connected to the other end of each current sharing element, and the other end of the switching element is grounded. One end of the diode is connected to the input power source, and the other end of the diode is connected to one end of the switching element, and is connected in parallel with at least two LED circuits. The motor driving circuit has a first driving end and a grounding end. The first driving end is connected to the control end of the switching element, and outputs a first driving signal, and the ground end is connected to the other end of the switching element.
Description
本發明涉及一種馬達驅動系統的並聯LED均流電路，特別是涉及一種包括馬達驅動電路及均流元件的馬達驅動系統的並聯LED均流電路。 The invention relates to a parallel LED current sharing circuit of a motor drive system, in particular to a parallel LED current sharing circuit of a motor drive system including a motor drive circuit and a current sharing component.
LED照明因為省電，逐漸廣泛應用於照明市場。LED已實際應用於某些家電產品以提供燈具輔助照明，如抽油煙機，其通常會有兩顆LED燈具作為輔助照明，而在此類家電上，為了提升可靠度，應搭配均流技術。 LED lighting is widely used in the lighting market because of its power saving. LED has been practically applied to some home appliances to provide auxiliary lighting for lamps, such as range hoods, which usually have two LED lamps as auxiliary lighting, and in this type of home appliances, in order to improve reliability, it should be matched with current sharing technology.
現由抽油煙機應用已導入了無刷直流馬達，其一般會有馬達驅動板，除控制馬達外，驅動板電源亦可提供予LED驅動電路及人機操作面板之電源，市售產品亦已將此部分做整合式的設計連結。 Brushless DC motors have been introduced for the application of range hoods. Generally, there are motor drive boards. In addition to the control motors, the power supply for the drive boards can also be supplied to the LED drive circuit and the power supply panel of the human-machine operation panel. Make this part an integrated design link.
而在現有的均流技術中，最簡單的LED驅動方式為將輸入電壓串聯限流電阻後，提供給LED。這樣的架構雖然簡單且成本低廉，然而，限流電阻為功率電阻，溫度高、體積大，更會損耗功率，故效率差。再者，由於LED特性誤差，定電壓驅動多顆LED時並無法均流。 In the existing current sharing technology, the simplest LED driving method is to supply the LED to the LED after the input voltage is connected in series with the current limiting resistor. Although such a structure is simple and low in cost, the current limiting resistor is a power resistor, and the temperature is high, the volume is large, and power is lost, so the efficiency is poor. Furthermore, due to the LED characteristic error, it is not possible to evenly flow when driving a plurality of LEDs with a constant voltage.
另外，此領域中亦有使用專用LED驅動IC，例如採用BUCK降壓型式架構。其優勢在於有專用IC可選用、可做電流回授控制、效率高，然而與前述現有方式相比，成本較高，且在單輸出並聯雙LED電流時仍不均流。並且，需專用IC驅動金屬氧化物半導體(Metal-Oxide-Semiconductor,MOS)開關，若不使用專用IC，則 另需一組電源驅動MOS。此外，若有進行電流回授，於單一LED損壞時會造成電流皆集中流至另一顆LED，而使得操作電流為原先的數倍，因此加速LED老化或損壞。 In addition, dedicated LED driver ICs are also used in this field, such as the BUCK step-down architecture. The advantage is that there is a dedicated IC, it can be used for current feedback control, and the efficiency is high. However, compared with the prior art, the cost is high, and the current is not evenly flowed when the single output is paralleled with the double LED current. Also, a dedicated IC-driven Metal Oxide-Semiconductor (MOS) switch is required. If a dedicated IC is not used, Another set of power drive MOS is required. In addition, if current feedback is performed, when a single LED is damaged, current will flow to another LED, and the operating current is several times that of the original, thereby accelerating LED aging or damage.
故，如何通過將均流架構進行改良，來克服上述的問題，已成為本技術領域所欲解決的重要課題之一。 Therefore, how to overcome the above problems by improving the current sharing architecture has become one of the important issues to be solved in the technical field.
本發明所要解決的技術問題在於，針對現有技術的不足提供一種馬達驅動系統的並聯LED均流電路。 The technical problem to be solved by the present invention is to provide a parallel LED current sharing circuit of a motor drive system for the deficiencies of the prior art.
為了解決上述的技術問題，本發明所採用的其中一技術方案是，提供一種馬達驅動系統的並聯LED均流電路，其包括彼此並聯的至少二LED電路、輸入電源、開關元件、二極體及馬達驅動電路。各該LED電路包括發光二極體及與發光二極體串聯的均流元件，且均流元件的一端連接於發光二極體的負極。輸入電源連接於各發光二極體的正極。該開關元件的第一端連接於各均流元件的另一端，開關元件的一第二端接地。二極體的一端連接於輸入電源，二極體的另一端連接於開關元件的第一端而與至少二LED電路並聯。馬達驅動電路具有第一驅動端及接地端，第一驅動端連接開關元件的控制端，並輸出第一驅動訊號，接地端連接於開關元件的第二端。 In order to solve the above technical problem, one technical solution adopted by the present invention is to provide a parallel LED current sharing circuit of a motor drive system, which includes at least two LED circuits, an input power source, a switching element, a diode, and Motor drive circuit. Each of the LED circuits includes a light emitting diode and a current sharing element connected in series with the light emitting diode, and one end of the current sharing element is connected to the negative electrode of the light emitting diode. The input power source is connected to the anode of each of the light emitting diodes. The first end of the switching element is connected to the other end of each current sharing element, and a second end of the switching element is grounded. One end of the diode is connected to the input power source, and the other end of the diode is connected to the first end of the switching element and connected in parallel with at least two LED circuits. The motor driving circuit has a first driving end and a grounding end. The first driving end is connected to the control end of the switching element, and outputs a first driving signal, and the grounding end is connected to the second end of the switching element.
為了解決上述的技術問題，本發明所採用的另外一技術方案是，提供一種並聯LED均流電路，其包括彼此並聯的至少二LED電路、輸入電源、開關元件及二極體。各該LED電路包括發光二極體及與發光二極體串聯的均流元件，且均流元件的一端連接於發光二極體的負極。輸入電源，連接於各發光二極體的正極。開關元件的第一端連接於各均流元件的另一端，開關元件的第二端接地。二極體的端連接於輸入電源，二極體的另一端連接於開關元件的第一端而與至少二LED電路並聯。其中，開關元件的控制端用於接收第一驅動訊號。 In order to solve the above technical problem, another technical solution adopted by the present invention is to provide a parallel LED current sharing circuit including at least two LED circuits, an input power source, a switching element, and a diode in parallel with each other. Each of the LED circuits includes a light emitting diode and a current sharing element connected in series with the light emitting diode, and one end of the current sharing element is connected to the negative electrode of the light emitting diode. The input power is connected to the positive electrode of each of the light emitting diodes. The first end of the switching element is connected to the other end of each current sharing element, and the second end of the switching element is grounded. The end of the diode is connected to the input power source, and the other end of the diode is connected to the first end of the switching element in parallel with at least two LED circuits. The control end of the switching element is configured to receive the first driving signal.
藉由本發明的馬達驅動系統的並聯LED均流電路，僅需馬達驅動電路的一支腳位輸出脈衝調變(Pulse Width Modulation,PWM)訊號即可控制，不需另加驅動IC。 The parallel LED current sharing circuit of the motor drive system of the present invention can be controlled by only one pulse output pulse modulation (PWM) signal of the motor drive circuit, and no additional driver IC is needed.
由於採用了反降壓式電源轉換器架構，馬達驅動電路與開關元件為共地架構驅動，亦不需另加驅動電源。再者，控制馬達驅動電路輸出脈衝調變訊號的佔空比，即可決定LED電流。 Due to the anti-buck power converter architecture, the motor drive circuit and the switching components are driven by a common ground structure, and no additional power supply is required. Furthermore, controlling the motor drive circuit to output the duty cycle of the pulse modulation signal determines the LED current.
此外，以LED各串聯電感可解決單一LED損壞時導致的電流過大問題，可提升可靠度。並且，若能控制好電感誤差值，則可控制LED電流於一定誤差範圍，可改善均流問題。而與現有技術相比，由於不需專用IC，且共用馬達驅動系統的馬達驅動電路，雖然增加了電感的設置，仍可以節省成本。 In addition, the LED series inductance can solve the problem of excessive current caused by single LED damage, which can improve reliability. Moreover, if the inductance error value can be controlled, the LED current can be controlled within a certain error range, which can improve the current sharing problem. Compared with the prior art, since the dedicated IC is not required, and the motor drive circuit of the motor drive system is shared, although the inductance is increased, the cost can be saved.
為使能更進一步瞭解本發明的特徵及技術內容，請參閱以下有關本發明的詳細說明與圖式，然而所提供的圖式僅用於提供參考與說明，並非用來對本發明加以限制。 For a better understanding of the features and technical aspects of the present invention, reference should be made to the detailed description and drawings of the invention.
1‧‧‧並聯LED均流電路 1‧‧‧Parallel LED current sharing circuit
10、12、20、22‧‧‧LED電路 10, 12, 20, 22‧‧‧ LED circuits
100、120‧‧‧均流元件 100, 120‧‧‧ current sharing components
2‧‧‧馬達驅動系統的並聯LED均流電路 2‧‧‧Parallel LED current sharing circuit for motor drive system
24‧‧‧馬達驅動電路 24‧‧‧Motor drive circuit
26‧‧‧馬達元件 26‧‧‧Motor components
240‧‧‧脈衝寬度調變模組 240‧‧‧ pulse width modulation module
C1‧‧‧控制端 C1‧‧‧ control terminal
D‧‧‧汲極 D‧‧‧汲
D1‧‧‧二極體 D1‧‧‧ diode
DR1‧‧‧第一驅動端 DR1‧‧‧ first drive
DR2‧‧‧第二驅動端 DR2‧‧‧second drive
DRV1‧‧‧第一驅動訊號 DRV1‧‧‧ first drive signal
DRV2‧‧‧第二驅動訊號 DRV2‧‧‧second drive signal
G‧‧‧閘極 G‧‧‧ gate
GND‧‧‧接地端 GND‧‧‧ ground terminal
L1、L2‧‧‧電感 L1, L2‧‧‧ inductance
LED1、LED2‧‧‧發光二極體 LED1, LED2‧‧‧Lighting diode
NM1‧‧‧N型MOS場效電晶體 NM1‧‧‧N type MOS field effect transistor
PWM1、PWM2‧‧‧脈衝調變訊號 PWM1, PWM2‧‧‧ pulse modulation signal
S‧‧‧源極 S‧‧‧ source
S1‧‧‧開關元件 S1‧‧‧ switching components
Vcc‧‧‧電壓源 Vcc‧‧‧ voltage source
VCC‧‧‧電源端 VCC‧‧‧ power terminal
Vin‧‧‧輸入電源 Vin‧‧‧Input power supply
圖1為本發明第一實施例的並聯LED均流電路的電路佈局圖。 1 is a circuit layout diagram of a parallel LED current sharing circuit according to a first embodiment of the present invention.
圖2為本發明第二實施例的馬達驅動系統的並聯LED均流電路的電路佈局圖。 2 is a circuit layout diagram of a parallel LED current sharing circuit of a motor drive system according to a second embodiment of the present invention.
以下是通過特定的具體實施例來說明本發明所公開有關“馬達驅動系統的並聯LED均流電路”的實施方式，本領域技術人員可由本說明書所公開的內容瞭解本發明的優點與效果。本發明可通過其他不同的具體實施例加以施行或應用，本說明書中的各項細節也可基於不同觀點與應用，在不悖離本發明的構思下進行各種修改與變更。另外，本發明的附圖僅為簡單示意說明，並非依實際尺寸的描繪，事先聲明。以下的實施方式將進一步詳細說明本發明的相關技術內容，但所公開的內容並非用以限制本發明的 保護範圍。 The following is a description of an embodiment of the present invention relating to "parallel LED current sharing circuit of a motor drive system" by a specific embodiment, and those skilled in the art can understand the advantages and effects of the present invention from the contents disclosed in the present specification. The invention can be implemented or applied in various other specific embodiments, and various modifications and changes can be made without departing from the spirit and scope of the invention. In addition, the drawings of the present invention are merely illustrative and are not intended to be stated in the actual size. The following embodiments will further explain the related technical content of the present invention, but the disclosure is not intended to limit the present invention. protected range.
應理解，雖然本文中可能使用術語第一、第二、第三等來描述各種元件或者信號，但這些元件或者信號不應受這些術語的限制。這些術語主要是用以區分一元件與另一元件，或者一信號與另一信號。另外，本文中所使用的術語“或”，應視實際情況可能包括相關聯的列出項目中的任一個或者多個的組合。 It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements or signals, these elements or signals are not limited by these terms. These terms are primarily used to distinguish one element from another, or one signal and another. In addition, the term "or" as used herein may include a combination of any one or more of the associated listed items, depending on the actual situation.
[第一實施例] [First Embodiment]
請參閱圖1所示，其為本發明第一實施例的並聯LED均流電路的方塊圖。由上述圖中可知，本發明第一實施例提供一種並聯LED均流電路1，其包括彼此並聯的LED電路10、12、輸入電源Vin、開關元件S1及二極體D1。LED電路10包括發光二極體LED1及與發光二極體LED1串聯的均流元件100，LED電路12包括發光二極體LED2及與發光二極體LED2串聯的均流元件120。均流元件100的一端連接於發光二極體LED1的負極，均流元件120的一端連接於發光二極體LED2的負極。輸入電源Vin，連接於發光二極體LED1及LED2的正極。開關元件S1的第一端連接於均流元件100、120的另一端，開關元件S1的第二端接地。二極體D1一端連接於輸入電源Vin，二極體D1另一端連接於開關元件S1的第一端而與二LED電路10、12並聯。其中，開關元件S1的控制端C1用於接收第一驅動訊號DRV1。 Please refer to FIG. 1, which is a block diagram of a parallel LED current sharing circuit according to a first embodiment of the present invention. As can be seen from the above figures, the first embodiment of the present invention provides a parallel LED current sharing circuit 1 including LED circuits 10, 12, an input power source Vin, a switching element S1, and a diode D1 connected in parallel with each other. The LED circuit 10 includes a light-emitting diode LED 1 and a current sharing element 100 connected in series with the light-emitting diode LED 1. The LED circuit 12 includes a light-emitting diode LED 2 and a current sharing element 120 connected in series with the light-emitting diode LED 2 . One end of the current sharing element 100 is connected to the negative electrode of the LED 2, and one end of the current sharing element 120 is connected to the negative electrode of the LED 2 of the LED. The input power source Vin is connected to the positive electrodes of the LEDs 1 and 2 of the LEDs. The first end of the switching element S1 is connected to the other end of the current sharing elements 100, 120, and the second end of the switching element S1 is grounded. One end of the diode D1 is connected to the input power source Vin, and the other end of the diode D1 is connected to the first end of the switching element S1 and is connected in parallel with the two LED circuits 10 and 12. The control terminal C1 of the switching element S1 is configured to receive the first driving signal DRV1.
並聯LED均流電路1為用於對輸入電源Vin進行降壓所獲得的預定DC電壓的反降壓式電源轉換器架構。開關元件S1可由場效電晶體(FET)構成，而均流元件100、120可由電感構成。在本實施例中，開關元件S1安裝於接地的線路側，由此實現穩定的開關控制。 The parallel LED current sharing circuit 1 is an anti-buck power converter architecture for a predetermined DC voltage obtained by stepping down the input power source Vin. The switching element S1 may be composed of a field effect transistor (FET), and the current sharing elements 100, 120 may be composed of an inductor. In the present embodiment, the switching element S1 is mounted on the line side of the ground, thereby achieving stable switching control.
第一驅動訊號DRV1是用於對開關元件S1的導通/斷開(on/off)進行控制的驅動訊號，並且，將開關元件S1的斷開時間段控制為 特定時段。 The first driving signal DRV1 is a driving signal for controlling on/off of the switching element S1, and controls the off period of the switching element S1 to Specific time period.
接著，在本實施例中，在第一驅動訊號DRV1將開關元件S1切換成導通的情況下，電流分別沿著發光二極體LED1-均流元件100-開關元件S1-接地端的路徑，以及發光二極體LED2-均流元件120-開關元件S1-接地端的路徑流動。 Next, in the present embodiment, in the case where the first driving signal DRV1 switches the switching element S1 to be turned on, the current flows along the path of the light emitting diode LED1 - the current sharing element 100 - the switching element S1 - the ground end, respectively, and the light The path of the diode LED2-current sharing element 120 - the switching element S1 - the ground terminal flows.
此時，流經均流元件100、120的電流(開關元件S1的導通電流)的上升速度基於輸入電源Vin的大小而改變。即，在輸入電源Vin較低的情況下，流經均流元件100、120的電流的上升速度變慢，並且輸入電源Vin較高的情況下，流經均流元件100、120的電流的上升速度變快。 At this time, the rising speed of the current flowing through the current sharing elements 100 and 120 (the on-current of the switching element S1) changes based on the magnitude of the input power source Vin. That is, when the input power source Vin is low, the rising speed of the current flowing through the current sharing elements 100 and 120 is slow, and when the input power source Vin is high, the current flowing through the current sharing elements 100 and 120 rises. The speed is getting faster.
當第一驅動訊號DRV1將開關元件S1切換成斷開時，電流分別沿著均流元件100-二極體D1-發光二極體LED1及均流元件120-二極體D1-發光二極體LED2的閉合回路流動，並且流經均流元件100、120的電流逐漸降低。 When the first driving signal DRV1 switches the switching element S1 to be off, the current flows along the current sharing element 100-diode D1-light emitting diode LED1 and the current sharing element 120-diode D1-light emitting diode respectively The closed loop of the LED 2 flows, and the current flowing through the current sharing elements 100, 120 gradually decreases.
通過重複上述操作，第一驅動訊號DRV1對開關元件S1進行控制，即可決定發光二極體LED1及LED2的電流。因此，當第一驅動訊號DRV1為脈衝寬度調變(PWM)訊號時，其占空比D將可依據下式1決定發光二極體LED1及LED2的電流。 By repeating the above operation, the first driving signal DRV1 controls the switching element S1 to determine the currents of the LEDs 1 and 2 of the LEDs. Therefore, when the first driving signal DRV1 is a pulse width modulation (PWM) signal, the duty ratio D thereof can determine the currents of the LEDs LED1 and LED2 according to Equation 1 below.
因此，控制馬達驅動電路輸出脈衝調變訊號的占空比，即可決定LED電流。且均流元件100、120由電感構成時，亦可在單一LED損壞時，不論是開路損壞或短路損壞，均能解決電流過大問題，因此提升了可靠度。 Therefore, controlling the motor drive circuit to output the duty cycle of the pulse modulation signal determines the LED current. Moreover, when the current sharing components 100 and 120 are formed of an inductor, the problem of excessive current can be solved when the single LED is damaged, whether it is open circuit damage or short circuit damage, thereby improving the reliability.
延續上式1，均流元件100、120由電感構成時，其電感值須為相同的。優選的，若能控制好兩顆電感誤差值，例如，小於5%、小於3%或小於1%，則可控制兩顆LED電流於一定誤差範圍，改善均流問題。 Continuing the above formula 1, when the current sharing elements 100 and 120 are composed of inductors, the inductance values thereof must be the same. Preferably, if the two inductance error values can be controlled, for example, less than 5%, less than 3% or less than 1%, the two LED currents can be controlled within a certain error range to improve the current sharing problem.
[第二實施例] [Second embodiment]
請參考圖2，其為本發明第二實施例的馬達驅動系統的並聯LED均流電路的示意圖。在此實施例中，類似於第一實施例，類似的元件符號代表類似的元件，並不再贅述。 Please refer to FIG. 2, which is a schematic diagram of a parallel LED current sharing circuit of a motor drive system according to a second embodiment of the present invention. In this embodiment, similar element symbols are similar to the first embodiment, and will not be described again.
如圖所示，本發明第二實施例提供一種馬達驅動系統的並聯LED均流電路2，其包括彼此並聯的LED電路20及22、輸入電源Vin、N型MOS場效電晶體NM1、二極體D1及馬達驅動電路24。 As shown in the figure, a second embodiment of the present invention provides a parallel LED current sharing circuit 2 of a motor drive system including LED circuits 20 and 22 connected in parallel with each other, an input power source Vin, an N-type MOS field effect transistor NM1, and a diode. Body D1 and motor drive circuit 24.
LED電路20包括發光二極體LED1及與發光二極體LED1串聯的電感L1，LED電路22包括發光二極體LED2及與發光二極體LED2串聯的電感L2。電感L1、L2的一端分別連接於發光二極體LED1、LED2的負極。輸入電源Vin連接於發光二極體LED1、LED2的正極。N型MOS場效電晶體NM1的汲極D連接於電感L1、L2的另一端，N型MOS場效電晶體NM1的源極S接地。二極體D1一端連接於輸入電源Vin，二極體D1另一端連接於N型MOS場效電晶體NM1的汲極D，而與LED電路20、22並聯。 The LED circuit 20 includes a light-emitting diode LED 1 and an inductor L1 connected in series with the light-emitting diode LED 1. The LED circuit 22 includes a light-emitting diode LED 2 and an inductor L2 connected in series with the light-emitting diode LED 2. One ends of the inductors L1 and L2 are respectively connected to the negative electrodes of the LEDs LED1 and LED2. The input power source Vin is connected to the positive electrodes of the LEDs LED1 and LED2. The drain D of the N-type MOS field effect transistor NM1 is connected to the other end of the inductors L1 and L2, and the source S of the N-type MOS field effect transistor NM1 is grounded. One end of the diode D1 is connected to the input power source Vin, and the other end of the diode D1 is connected to the drain D of the N-type MOS field effect transistor NM1, and is connected in parallel with the LED circuits 20 and 22.
此外，馬達驅動電路24具有電源端VCC、第一驅動端DR1及接地端GND，電源端VCC連接於另一電壓源Vcc，此電壓源Vcc可與輸入電源Vin為相同電壓源，第一驅動端DR1連接N型MOS場效電晶體NM1的閘極G，接地端GND連接於N型MOS場效電晶體NM1的源極S。 In addition, the motor driving circuit 24 has a power terminal VCC, a first driving terminal DR1 and a ground terminal GND, and the power terminal VCC is connected to another voltage source Vcc. The voltage source Vcc can be the same voltage source as the input power source Vin, the first driving end. The DR1 is connected to the gate G of the N-type MOS field effect transistor NM1, and the ground GND is connected to the source S of the N-type MOS field effect transistor NM1.
在此實施例中，雖然僅繪示了LED電路20及22，而應設想的是，可依據需求將額外的LED電路添加至馬達驅動系統的並聯LED均流電路2，且每個LED電路均具備串聯的發光二極體與電感，從而增加實施上的靈活性。 In this embodiment, although only the LED circuits 20 and 22 are illustrated, it is contemplated that additional LED circuits can be added to the parallel LED current sharing circuit 2 of the motor drive system as required, and each LED circuit is It has a series of LEDs and inductors to increase flexibility in implementation.
在此實施例中，馬達驅動電路24更包括脈衝寬度調變模組240，其經配置以透過第一驅動端DR1輸出一脈衝寬度調變訊號 PWM1，以作為第一驅動訊號DRV1對N型MOS場效電晶體NM1進行控制。當第一驅動訊號DRV1為脈衝寬度調變訊號PWM1時，其占空比D將可依據下面的式1決定發光二極體LED1及LED2的電流。 In this embodiment, the motor driving circuit 24 further includes a pulse width modulation module 240 configured to output a pulse width modulation signal through the first driving end DR1. PWM1 controls the N-type MOS field effect transistor NM1 as the first driving signal DRV1. When the first driving signal DRV1 is the pulse width modulation signal PWM1, the duty ratio D thereof can determine the currents of the LEDs LED1 and LED2 according to Equation 1 below.
因此，控制馬達驅動電路24輸出脈衝調變訊號PWM1的占空比，即可決定LED電流。此外，藉由電感L1、L2的配置，除可提供均流效果，更可在單一LED損壞時，不論是開路損壞或短路損壞，均能解決電流過大問題，因此提升了可靠度。優選的，若能控制好兩顆電感誤差值，例如，小於5%、小於3%或小於1%，則可控制兩顆LED電流於一定誤差範圍，改善均流問題。 Therefore, the control motor drive circuit 24 outputs the duty ratio of the pulse modulation signal PWM1 to determine the LED current. In addition, by the configuration of the inductors L1 and L2, in addition to providing a current sharing effect, the problem of excessive current can be solved when a single LED is damaged, whether it is open circuit damage or short circuit damage, thereby improving reliability. Preferably, if the two inductance error values can be controlled, for example, less than 5%, less than 3% or less than 1%, the two LED currents can be controlled within a certain error range to improve the current sharing problem.
此外，傳統採用BUCK降壓型式架構中，需專用IC驅動金屬氧化物半導體(Metal-Oxide-Semiconductor,MOS)開關，若不使用專用IC，則另需一組電源驅動MOS場效電晶體。與之不同的，在本實施例中，馬達驅動電路24可為馬達驅動系統中常用之微控制器(MCU)，僅需一支通用型之輸入輸出(General-purpose input/output,GPIO)接腳輸出PWM即可對LED電流進行控制。再者，由於採用了反降壓式電源轉換器架構，馬達驅動電路與開關元件為共地架構驅動，亦不需另加驅動電源來驅動MOS場效電晶體。 In addition, in the traditional BUCK step-down architecture, a dedicated IC-driven Metal-Oxide-Semiconductor (MOS) switch is required. If a dedicated IC is not used, a set of power-driven MOS field-effect transistors is required. In contrast, in this embodiment, the motor drive circuit 24 can be a commonly used microcontroller (MCU) in a motor drive system, and only requires a general-purpose input/output (GPIO) connection. The pin output PWM controls the LED current. Furthermore, due to the use of an anti-buck power converter architecture, the motor drive circuit and the switching elements are driven in a common structure, and no additional driving power source is required to drive the MOS field effect transistor.
舉例來說，馬達驅動電路24可為用於驅動馬達元件26的馬達驅動系統中常用之微控制器(MCU)，例如，無刷馬達，使用無刷馬達比傳統交流馬達作為抽油煙機馬達，具有以下優點：無刷馬達可輕易的達到無段變速，可以比傳統交流馬達有更寬的轉速調變範圍。另外，無刷馬達有更好的能源效率，比傳統交流馬達更省能源。因此更適合於抽油煙機中使用。 For example, the motor drive circuit 24 can be a microcontroller (MCU) commonly used in motor drive systems for driving the motor component 26, such as a brushless motor, using a brushless motor as a range hood motor than a conventional AC motor. It has the following advantages: the brushless motor can easily reach the stepless speed change, and it can have a wider rotational speed modulation range than the conventional AC motor. In addition, brushless motors have better energy efficiency and are more energy efficient than traditional AC motors. Therefore, it is more suitable for use in range hoods.
在本實施例中，馬達驅動電路24可包括第二驅動端DR2，用 於輸出第二驅動訊號DRV2來驅動馬達元件26。此處，脈衝寬度調變模組240可用於輸出另一脈衝寬度調變訊號PWM2作為第二驅動訊號DRV2，因此可針對不同狀況，精確地自動設定所需之馬達轉動速度。而與現有技術相比，由於不需專用IC，且共用馬達驅動系統的馬達驅動電路，雖然增加了電感的設置，仍可以節省成本。 In this embodiment, the motor driving circuit 24 can include a second driving end DR2, The motor element 26 is driven to output the second drive signal DRV2. Here, the pulse width modulation module 240 can be used to output another pulse width modulation signal PWM2 as the second driving signal DRV2, so that the required motor rotation speed can be accurately and automatically set for different conditions. Compared with the prior art, since the dedicated IC is not required, and the motor drive circuit of the motor drive system is shared, although the inductance is increased, the cost can be saved.
綜上所述，藉由本發明的馬達驅動系統的並聯LED均流電路，僅需馬達驅動電路的一支腳位輸出脈衝調變(Pulse Width Modulation,PWM)訊號即可控制，不需另加驅動IC。 In summary, the parallel LED current sharing circuit of the motor drive system of the present invention can be controlled by only one pulse output pulse modulation (PWM) signal of the motor drive circuit, without additional driving. IC.
由於採用了反降壓式電源轉換器架構，馬達驅動電路與開關元件為共地架構驅動，亦不需另加驅動電源。再者，控制馬達驅動電路輸出脈衝調變訊號的佔空比，即可決定LED電流。 Due to the anti-buck power converter architecture, the motor drive circuit and the switching components are driven by a common ground structure, and no additional power supply is required. Furthermore, controlling the motor drive circuit to output the duty cycle of the pulse modulation signal determines the LED current.
此外，以LED各串聯電感可解決單一LED損壞時導致的電流過大問題，可提升可靠度。並且，若能控制好電感誤差值，則可控制LED電流於一定誤差範圍，可改善均流問題。而與現有技術相比，由於不需專用IC，且共用馬達驅動系統的馬達驅動電路，雖然增加了電感的設置，仍可以節省成本。 In addition, the LED series inductance can solve the problem of excessive current caused by single LED damage, which can improve reliability. Moreover, if the inductance error value can be controlled, the LED current can be controlled within a certain error range, which can improve the current sharing problem. Compared with the prior art, since the dedicated IC is not required, and the motor drive circuit of the motor drive system is shared, although the inductance is increased, the cost can be saved.
以上所公開的內容僅為本發明的優選可行實施例，並非因此侷限本發明的申請專利範圍，所以凡是運用本發明說明書及圖式內容所做的等效技術變化，均包括於本發明的申請專利範圍內。 The above disclosure is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Therefore, any equivalent technical changes made by using the present specification and the contents of the drawings are included in the application of the present invention. Within the scope of the patent.
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