TWI825399B - Inductive load drive circuit and electromagnetic braking system - Google Patents
Inductive load drive circuit and electromagnetic braking system Download PDFInfo
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F7/00—Magnets
- H01F7/06—Electromagnets; Actuators including electromagnets
- H01F7/08—Electromagnets; Actuators including electromagnets with armatures
- H01F7/18—Circuit arrangements for obtaining desired operating characteristics, e.g. for slow operation, for sequential energisation of windings, for high-speed energisation of windings
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- 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
- H02P3/00—Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters
- H02P3/02—Details of stopping control
- H02P3/04—Means for stopping or slowing by a separate brake, e.g. friction brake or eddy-current brake
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/04—Modifications for accelerating switching
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/60—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors
- H03K17/615—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors in a Darlington configuration
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/60—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors
- H03K17/64—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being bipolar transistors having inductive loads
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors
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Abstract
第一電晶體(Tr1)與第二電晶體(Tr2)配置於全橋電路的對角。第一二極體(D1)設置於第一輸出端子(OUT1)與負極電源線(104)之間。達靈頓電路(112)設置於第二輸出端子(OUT2)與正極電源線(102)之間。齊納二極體(ZD1)設置於達靈頓電路(112)的控制端子與第二輸出端子(OUT2)之間。The first transistor (Tr1) and the second transistor (Tr2) are arranged at opposite corners of the full bridge circuit. The first diode (D1) is disposed between the first output terminal (OUT1) and the negative power line (104). The Darlington circuit (112) is provided between the second output terminal (OUT2) and the positive power line (102). The Zener diode (ZD1) is provided between the control terminal and the second output terminal (OUT2) of the Darlington circuit (112).
Description
本公開有關感應負載(inductive load)的驅動電路。The present disclosure relates to a driving circuit for an inductive load.
作為使馬達的旋轉停止的機構,可以廣泛使用電磁制動器。電磁制動器係機械制動器之一。在無勵磁作動型的電磁制動器中,在勵磁線圈未通電狀態下,電樞(armature)被彈簧線圈按壓在制動轂(brake hub),制動器成為工作狀態(保持狀態)。若向勵磁線圈施加電壓,則電磁鐵吸引電樞,成為制動器的開放狀態。由於這樣的特性,無勵磁作動型的電磁制動器大多用於緊急情況或停電時應優先安全性的用途。As a mechanism for stopping the rotation of the motor, electromagnetic brakes are widely used. The electromagnetic brake is one of the mechanical brakes. In a non-excitation actuation type electromagnetic brake, when the excitation coil is not energized, the armature is pressed against the brake hub by the spring coil, and the brake enters the operating state (holding state). When a voltage is applied to the excitation coil, the electromagnet attracts the armature and the brake becomes an open state. Due to such characteristics, non-excitation actuated electromagnetic brakes are often used in applications where safety is prioritized during emergencies or power outages.
圖1係具備馬達的控制系統的方塊圖。整流器10對交流電壓進行整流。逆變器20將由整流器10產生的直流電壓VDC
轉換為交流電壓,並驅動馬達2。Figure 1 is a block diagram of a control system with a motor. Rectifier 10 rectifies AC voltage. The
電磁制動器4及制動器驅動電路40形成電磁制動系統。制動器驅動電路40藉由對電磁制動器4的勵磁線圈切換勵磁(通電)、無勵磁(非通電),來切換開放及制動。The
圖2(a)、圖2(b)係表示制動器驅動電路40的構造例子的電路圖。圖2(a)的制動器驅動電路40係包含電晶體Tr1~Tr4的全橋電路。在制動解除(非制動)期間,接通電晶體Tr1與電晶體Tr2對,對電磁制動器4的勵磁線圈施加第一極性的電壓。在該狀態下,保持電流I0
流過勵磁線圈。2(a) and 2(b) are circuit diagrams showing a structural example of the brake drive circuit 40. The brake drive circuit 40 of FIG. 2(a) is a full-bridge circuit including transistors Tr1 to Tr4. During the braking release (non-braking) period, the pair of transistor Tr1 and transistor Tr2 is turned on, and a voltage of the first polarity is applied to the excitation coil of the
在制動時,制動器驅動電路40接通電晶體Tr3與電晶體Tr4對,對勵磁線圈施加與解除狀態逆極性的電壓,使電磁制動器消弧。During braking, the brake drive circuit 40 turns on the pair of transistor Tr3 and transistor Tr4, and applies a voltage with the opposite polarity to the release state to the excitation coil to extinguish the arc of the electromagnetic brake.
圖2(b)的制動器驅動電路40包括包含電晶體Tr1、電晶體Tr2及二極體D1、二極體D2的對角橋接電路。在制動解除(非制動)期間,接通電晶體Tr1與電晶體Tr2對,對電磁制動器4的勵磁線圈施加第一極性的電壓。在該狀態下,保持電流I0
流過勵磁線圈。The brake driving circuit 40 of FIG. 2(b) includes a diagonal bridge circuit including a transistor Tr1, a transistor Tr2, and a diode D1 and a diode D2. During the braking release (non-braking) period, the pair of transistor Tr1 and transistor Tr2 is turned on, and a voltage of the first polarity is applied to the excitation coil of the
在電磁制動器消弧時,斷開電晶體Tr1、電晶體Tr2。流過勵磁線圈的電流經由二極體D1、二極體D2進行再生,電磁制動器被消弧。 [先前技術文獻]When the electromagnetic brake arc extinguishes, the transistors Tr1 and Tr2 are disconnected. The current flowing through the excitation coil is regenerated via diodes D1 and D2, and the electromagnetic brake is extinguished. [Prior technical literature]
[專利文獻1]日本特開平9-69435號公報 [專利文獻2]日本特開2018-43624號公報 [專利文獻3]日本特開2017-185596號公報 [專利文獻4]日本特表2015-533206號公報[Patent Document 1] Japanese Patent Application Laid-Open No. 9-69435 [Patent Document 2] Japanese Patent Application Publication No. 2018-43624 [Patent Document 3] Japanese Patent Application Publication No. 2017-185596 [Patent Document 4] Japanese Patent Publication No. 2015-533206
[發明所欲解決之問題][Problem to be solved by the invention]
問題1.
圖2(a)的制動器驅動電路的電晶體的個數較多,並且對每個電晶體都必須設置閘極驅動電路,因此電路規模大。
在圖2(b)的制動器驅動電路中,保持電流I0 降低至0所需的消弧時間τ,在式(1)中給出,並由DC電壓VPN 限定。 In the brake drive circuit of Figure 2(b), the arc extinguishing time τ required to keep the current I 0 reduced to 0 is given in equation (1) and is limited by the DC voltage V PN .
此外,同樣的問題不限於電磁制動器的勵磁線圈的驅動電路,還適用於將其他感應負載作為對象的驅動電路。In addition, the same problem is not limited to the drive circuit of the excitation coil of the electromagnetic brake, but also applies to drive circuits targeting other inductive loads.
問題2.
在專利文獻3的技術中,藉由直流電壓源驅動電磁制動器的勵磁線圈。因此,為了縮短勵磁開始之後到制動器開放為止的時間,必須增加直流電壓。此時,導致制動器工作的保持狀態下的電流變大,耗電增加。
相反地,如果為了減小制動器開放狀態下的電流而減小直流電壓,則到制動器開放為止的時間變長。因此,在以往,制動器的開放時間與耗電呈權衡取捨的關係。On the contrary, if the DC voltage is reduced in order to reduce the current in the brake-released state, the time until the brake is released becomes longer. Therefore, in the past, there was a trade-off between brake opening time and power consumption.
本揭示的一樣態係在該情況下開發完成者,其示例性目的之一為提供一種能夠在短時間內減少感應負載的電流的驅動電路。The aspect of the present disclosure was developed under this circumstance, and one of its exemplary purposes is to provide a driving circuit capable of reducing the current of an inductive load in a short time.
本揭示的另一樣態係在該情況下開發完成者,其例示性目的之一為提供一種能夠縮短制動器的開放時間的同時削減耗電的驅動電路。 [解決問題之技術手段]Another aspect of the present disclosure was developed under this circumstance, and one of its illustrative purposes is to provide a drive circuit that can shorten the opening time of the brake and reduce power consumption. [Technical means to solve problems]
1.本揭示的一樣態的驅動電路具備:連接有感應負載的第一輸出端子及第二輸出端子;設置於第一輸出端子與正極電源線之間的第一電晶體;設置於第一輸出端子與負極電源線之間的第一二極體;設置於第二輸出端子與負極電源線之間的第二電晶體;設置於第二輸出端子與正極電源線之間的達靈頓電路(Darlington Circuit);及設置於達靈頓電路的控制端子與第二輸出端子之間的齊納二極體(Zener diode)。1. A driving circuit according to the present disclosure includes: a first output terminal and a second output terminal connected to an inductive load; a first transistor provided between the first output terminal and the positive power line; and a first transistor provided between the first output terminal and the positive power line; a first diode between the terminal and the negative power supply line; a second transistor disposed between the second output terminal and the negative power supply line; a Darlington circuit disposed between the second output terminal and the positive power supply line ( Darlington Circuit); and a Zener diode disposed between the control terminal and the second output terminal of the Darlington circuit.
依該樣態,能夠在第二輸出端子產生高於正極電源線的電壓的電壓,能夠將增壓的電壓施加到感應負載,能夠在短時間內減少感應負載的電流。According to this aspect, a voltage higher than the voltage of the positive power supply line can be generated at the second output terminal, the boosted voltage can be applied to the inductive load, and the current of the inductive load can be reduced in a short time.
本揭示的另一樣態亦係驅動電路。該驅動電路具備:連接有感應負載的第一輸出端子及第二輸出端子;設置於第一輸出端子與正極電源線之間的第一電晶體;設置於第一輸出端子與負極電源線之間的達靈頓電路;設置於達靈頓電路的控制端子與第一輸出端子之間的齊納二極體;設置於第二輸出端子與負極電源線之間的第二電晶體;及設置於第二輸出端子與正極電源線之間的第二二極體。Another aspect of this disclosure is also a driving circuit. The drive circuit includes: a first output terminal and a second output terminal connected to an inductive load; a first transistor disposed between the first output terminal and the positive power supply line; and a first transistor disposed between the first output terminal and the negative power supply line. The Darlington circuit; the Zener diode disposed between the control terminal of the Darlington circuit and the first output terminal; the second transistor disposed between the second output terminal and the negative power line; and A second diode between the second output terminal and the positive power line.
依該樣態,能夠在第一輸出端子產生低於負極電源線的電壓的電壓,能過將增壓的電壓施加到感應負載,能夠在短時間內減少感應負載的電流。According to this aspect, a voltage lower than the voltage of the negative power supply line can be generated at the first output terminal, and the current of the inductive load can be reduced in a short time by applying the boosted voltage to the inductive load.
達靈頓電路亦可以包含:基極與齊納二極體的陽極連接的第三電晶體;基極與第三電晶體的射極連接的第四電晶體;及與第三電晶體的集極連接的電阻。The Darlington circuit may also include: a third transistor with a base connected to the anode of the Zener diode; a fourth transistor with a base connected to the emitter of the third transistor; and a collector connected to the third transistor. pole connected resistor.
感應負載亦可以係無勵磁型的電磁制動器的線圈。藉此,能夠實現高速的制動。The inductive load can also be the coil of a non-excitation electromagnetic brake. This enables high-speed braking.
2.本揭示的一樣態的制動器驅動電路具備:與電磁制動器的勵磁線圈連接的全橋電路;檢測流過勵磁線圈的線圈電流的電流檢測電路;及控制器,其響應於勵磁指令,開始全橋電路的對角臂的電晶體對的驅動,當檢測到由電樞的移動開始引起的線圈電流的變動時,使電晶體對的佔空比(duty cycle)降低。2. A brake drive circuit according to the present disclosure includes: a full-bridge circuit connected to an excitation coil of the electromagnetic brake; a current detection circuit that detects coil current flowing through the excitation coil; and a controller that responds to an excitation command. , starts driving the transistor pairs of the diagonal arms of the full-bridge circuit, and when detecting a change in the coil current caused by the start of movement of the armature, reduces the duty cycle of the transistor pair.
電樞開始移動的瞬間,產生反電動勢,因此線圈電流暫時減少。藉由檢測線圈電流的變化,能夠知道制動器實際開放的時刻。The moment the armature starts moving, a back electromotive force is generated, so the coil current is temporarily reduced. By detecting changes in coil current, the actual moment when the brake is released can be known.
將全橋電路的電源電壓設為VPN ,將線圈電流的變動的檢測前的電晶體對的佔空比設為d1,將線圈電流的變動的檢測後的電晶體對的佔空比設為d2。剛產生勵磁指令後,施加於勵磁線圈的驅動電壓VL 等於d1×VPN ,電樞的移動開始後的驅動電壓VL 為d2×VPN ,以VPN 與d1、d2這三個動作參數,能夠規定驅動條件。因此,藉由較大設計VPN 及佔空比d1,縮短制動器開放所需的時間的同時,減小佔空比d2,能夠削減制動器開放後的電流,能夠減少耗電。Let the power supply voltage of the full-bridge circuit be V PN , let the duty cycle of the transistor pair before detection of the change in the coil current be d1, and let the duty cycle of the transistor pair after the detection of the change in the coil current be d2. Just after the excitation command is generated, the driving voltage V L applied to the excitation coil is equal to d1 × V PN , and the driving voltage V L after the armature movement starts is d2 × V PN . Taking V PN and d1 and d2 as the three Action parameters can specify driving conditions. Therefore, by designing a larger V PN and duty cycle d1, while shortening the time required for brake release, and reducing the duty cycle d2, the current after the brake is released can be reduced, and power consumption can be reduced.
全橋電路亦可以包含:與勵磁線圈連接的第一輸出端子及第二輸出端子;設置於第一輸出端子與正極電源線之間的第一電晶體;設置於第一輸出端子與負極電源線之間的二極體;設置於第二輸出端子與負極電源線之間的第二電晶體;設置於第二輸出端子與正極電源線之間的達靈頓電路;及設置於達靈頓電路的控制端子與第二輸出端子之間的齊納二極體。The full-bridge circuit may also include: a first output terminal and a second output terminal connected to the excitation coil; a first transistor disposed between the first output terminal and the positive power supply line; and a first transistor disposed between the first output terminal and the negative power supply line. a diode between the lines; a second transistor disposed between the second output terminal and the negative power line; a Darlington circuit disposed between the second output terminal and the positive power line; and a Darlington circuit disposed between Zener diode between the control terminal and the second output terminal of the circuit.
依該樣態,能夠在第二輸出端子產生高於正極電源線的電壓的電壓,藉由將增壓的電壓施加到勵磁線圈,能夠縮短電磁制動器的制動生效為止的時間。According to this aspect, a voltage higher than the voltage of the positive power supply line can be generated at the second output terminal, and by applying the boosted voltage to the excitation coil, the time until the electromagnetic brake takes effect can be shortened.
全橋電路亦可以包含:與勵磁線圈連接的第一輸出端子及第二輸出端子;設置於第一輸出端子與正極電源線之間的第一電晶體;設置於第一輸出端子與負極電源線之間的達靈頓電路;設置於達靈頓電路的控制端子與第一輸出端子之間的齊納二極體;設置於第二輸出端子與負極電源線之間的第二電晶體;及設置於第二輸出端子與正極電源線之間的二極體。The full-bridge circuit may also include: a first output terminal and a second output terminal connected to the excitation coil; a first transistor disposed between the first output terminal and the positive power supply line; and a first transistor disposed between the first output terminal and the negative power supply line. a Darlington circuit between lines; a Zener diode disposed between the control terminal of the Darlington circuit and the first output terminal; a second transistor disposed between the second output terminal and the negative power supply line; and a diode disposed between the second output terminal and the positive power line.
依該樣態,能夠在第一輸出端子產生低於負極電源線的電壓的電壓,藉由將增壓的電壓施加到勵磁線圈,能夠縮短電磁制動器的制動生效為止的時間。According to this aspect, a voltage lower than the voltage of the negative power supply line can be generated at the first output terminal, and by applying the boosted voltage to the excitation coil, the time until the electromagnetic brake takes effect can be shortened.
達靈頓電路亦可以包含:基極與齊納二極體的陽極連接的第三電晶體;基極與第三電晶體的射極連接的第四電晶體;及與第三電晶體的集極連接的電阻。The Darlington circuit may also include: a third transistor with a base connected to the anode of the Zener diode; a fourth transistor with a base connected to the emitter of the third transistor; and a collector connected to the third transistor. pole connected resistor.
此外,將以上構成要素的任意組合或本發明的構成要素或表述在方法、裝置及系統等之間互相替換者亦作為本發明的樣態而有效。In addition, any combination of the above constituent elements or the mutual replacement of constituent elements or expressions of the present invention between methods, devices, systems, etc. are also valid as aspects of the present invention.
進而,該項目(用於解決問題的手段)的記載不是說明本發明的不可缺少的所有特徵者,因此,所記載的該等特徵的子組合亦可以是本發明。 此外,將以上構成要素的任意組合或本發明的構成要素或表述在方法、裝置及系統等之間互相替換者亦作為本發明的樣態而有效。Furthermore, the description of this item (means for solving the problem) does not describe all the features that are indispensable to the present invention. Therefore, a sub-combination of the described features may also constitute the present invention. In addition, any combination of the above constituent elements or the mutual replacement of constituent elements or expressions of the present invention between methods, devices, systems, etc. are also valid as aspects of the present invention.
進而,該項目(用於解決問題的手段)的記載不是說明本發明的不可缺少的所有特徵者,因此,所記載的該等特徵的子組合亦可以是本發明。 [發明之效果]Furthermore, the description of this item (means for solving the problem) does not describe all the features that are indispensable to the present invention. Therefore, a sub-combination of the described features may also constitute the present invention. [Effects of the invention]
依本發明的一樣態,能夠在短時間內減少感應負載的電流。According to one aspect of the present invention, the current of the inductive load can be reduced in a short time.
以下,基於適合的實施形態,參閱圖式對本發明進行說明。對各圖式所示的相同或相等的構成要素、構件、處理標註相同的符號,並適當省略重複的說明。又,實施形態為例示,並非係限定發明者,且實施形態中記述的所有的特徵或其組合,未必係限定發明的本質者。Hereinafter, the present invention will be described based on suitable embodiments with reference to the drawings. The same or equivalent components, members, and processes shown in the drawings are denoted by the same symbols, and repeated descriptions are appropriately omitted. In addition, the embodiments are examples and do not limit the inventors, and all the features described in the embodiments or their combinations do not necessarily limit the essence of the invention.
(實施形態1)
圖3係實施形態1之驅動電路100A的電路圖。驅動電路100A驅動作為感應負載的線圈L1。感應負載的種類沒有限定,例如可以係電磁制動器的勵磁線圈。驅動電路100A具備第一輸出端子OUT1、第二輸出端子OUT2、第一電晶體Tr1、第二電晶體Tr2、第一二極體D1、達靈頓電路112。(Embodiment 1)
FIG. 3 is a circuit diagram of the
第一輸出端子OUT1與線圈L1的一端連接,第二輸出端子OUT2與線圈L1的另一端連接。第一電晶體Tr1設置於第一輸出端子OUT1與正極電源線102之間。第一二極體D1設置於第一輸出端子OUT1與負極電源線104之間。第二電晶體Tr2設置於第二輸出端子OUT2與負極電源線104之間。第一電晶體Tr1及第二電晶體Tr2為IGBT(Insulated Gate Bipolar Transistor:絕緣閘雙極電晶體)。The first output terminal OUT1 is connected to one end of the coil L1, and the second output terminal OUT2 is connected to the other end of the coil L1. The first transistor Tr1 is provided between the first output terminal OUT1 and the positive
達靈頓電路112設置於第二輸出端子OUT2與正極電源線102之間。齊納二極體ZD1設置於達靈頓電路112的閘極(即基極)與第二輸出端子OUT2之間。The
達靈頓電路112包含作為NPN型雙極電晶體的第三電晶體Tr3及第四電晶體Tr4和電阻R1。第三電晶體Tr3的基極與齊納二極體ZD1的陽極連接。第四電晶體Tr4的射極與正極電源線102連接,其集極與第二輸出端子OUT2連接,基極與第三電晶體Tr3的射極連接。電阻R1設置於第三電晶體Tr3的集極與第二輸出端子OUT2之間。The
以上是驅動電路100A的構造。接著,設為線圈L1為無勵磁型的電磁制動器的勵磁線圈,對具備驅動電路100A和電磁制動器的電磁制動系統的動作進行說明。The above is the structure of the
圖4係圖3的驅動電路100A的動作波形圖。在時刻t0
之前,係制動的解除期間,第一電晶體Tr1及第二電晶體Tr2接通,在第一輸出端子OUT1產生正極電源線102的電壓VPN
,在第二輸出端子OUT2產生負極電源線104的電壓(0V)。此時,在線圈L1中,向圖3的電路圖中的右方向流過電流量I0
的線圈電流IL
。FIG. 4 is an operation waveform diagram of the
在時刻t0
產生制動指令時,驅動電路100A的第一電晶體Tr1、第二電晶體Tr2成為斷開。如此一來,線圈電流IL
開始在第一二極體D1、線圈L1、達靈頓電路112的路徑流動。此時的第一輸出端子OUT1的電壓成為0V,第二輸出端子OUT2的電壓成為VPN
+Vz+2×Vbe。Vz為齊納二極體ZD1的齊納電壓,Vbe為第三電晶體Tr3及第四電晶體Tr4的基極射極間電壓。當可以視為Vbe≈0的情況下,第二輸出端子OUT2的電壓與VPN
+Vz近似。此時,在線圈L1的兩端之間,施加VL
≈VPN
+Vz。When a braking command is generated at time t 0 , the first transistor Tr1 and the second transistor Tr2 of the
時刻t0 以後的線圈電流IL ,由式(2)表示,隨著時間而減少。 線圈電流IL 成為0為止的消弧時間τ,由式(3)表示。 The coil current IL after time t 0 is expressed by equation (2) and decreases with time. The arc extinguishing time τ until the coil current IL becomes 0 is expressed by equation (3).
在圖4中,使用圖2(b)的對角橋接電路時的動作以一點鏈線表示。此時的消弧時間τ’,在(1)中給出,消弧時間τ’成為實施形態1中的消弧時間τ的(VPN +Vz)/VPN 倍。換言之,依據本實施形態,能夠將消弧時間縮短至VPN /(VPN +Vz)。In Figure 4, the operation when using the diagonal bridge circuit of Figure 2(b) is represented by a one-dot chain line. The arc extinguishing time τ' at this time is given in (1), and the arc extinguishing time τ' is (V PN +Vz)/V PN times the arc extinguishing time τ in the first embodiment. In other words, according to this embodiment, the arc extinguishing time can be shortened to V PN /(V PN +Vz).
在無勵磁型的電磁制動器中,由消弧時間τ規定制動開始的時間。因此,藉由縮短消弧時間τ,能夠實現高速的制動。In a non-excitation type electromagnetic brake, the arc extinguishing time τ determines the time when braking starts. Therefore, by shortening the arc extinguishing time τ, high-speed braking can be achieved.
又,由於驅動電路100A不需要用於驅動電晶體Tr3或電晶體Tr4的閘極驅動電路,因此具有能夠構成為比圖2(a)的全橋電路簡單這一優點。In addition, since the
(實施形態2)
圖5係實施形態2之驅動電路100B的電路圖。在驅動電路100B中,達靈頓電路112的位置變更為在第一輸出端子OUT1與負極電源線104之間。(Embodiment 2)
FIG. 5 is a circuit diagram of the
圖6係圖5的驅動電路100B的動作波形圖。在時刻t0
之前,係制動的解除期間,第一電晶體Tr1及第二電晶體Tr2接通,在第一輸出端子OUT1產生正極電源線102的電壓VPN
,在第二輸出端子OUT2產生負極電源線104的電壓(0V)。此時,在線圈L1中,向圖5的電路圖中的右方向流過電流量I0
的線圈電流IL
。FIG. 6 is an operation waveform diagram of the driving
在時刻t0
產生制動指令時,驅動電路100B的第一電晶體Tr1、第二電晶體Tr2成為斷開。如此一來,線圈電流IL
開始在達靈頓電路112、線圈L1、第二二極體D2的路徑流動。此時的第一輸出端子OUT1的電壓成為-(Vz+2×Vbe),第二輸出端子OUT2的電壓成為VPN
。此時,在線圈L1的兩端之間,施加VL
≈VPN
+Vz。When a braking command is generated at time t 0 , the first transistor Tr1 and the second transistor Tr2 of the
與實施形態1同樣地,時刻t0
以後的線圈電流IL
,由式(2)表示,隨著時間而減少。而且線圈電流IL
成為0為止的消弧時間τ,由式(3)表示。As in
如此,依據實施形態2,亦能夠縮短消弧時間τ。In this way, according to
對與實施形態1、實施形態2相關的變形例進行說明。Modifications related to
(變形例1.1) 作為第一電晶體Tr1或第二電晶體Tr2,能夠使用雙極電晶體、MOSFET(Metal Oxide Semiconductor Field Effect Transistor:金屬氧半導體場效應電晶體)、GaN-HEMT(High Electron Mobility Transistor:高電子遷移率電晶體)等功率電晶體,來代替IGBT。(Modification 1.1) As the first transistor Tr1 or the second transistor Tr2, a bipolar transistor, a MOSFET (Metal Oxide Semiconductor Field Effect Transistor), or a GaN-HEMT (High Electron Mobility Transistor) can be used. rate transistor) and other power transistors to replace IGBT.
(變形例1.2)
達靈頓電路112的構造並不限定於圖示的電路。在實施形態中,示出了2段的達靈頓電路,亦可以由3段以上構成。又,電晶體Tr3或電晶體Tr4可以由FET構成。這種情況下,在圖3的構造中,可以在作為達靈頓電路112的控制端子的閘極與正極電源線102之間,追加包含電阻等的電流路徑。或者,在圖5的構造中,可以在作為達靈頓電路112的控制端子的閘極與負極電源線104的第一輸出端子OUT1之間,追加包含電阻等的電流路徑。(Modification 1.2)
The structure of the
(變形例1.3)
在圖3中,亦可以在第二輸出端子OUT2與達靈頓電路112的控制端子之間,與齊納二極體ZD1串列地追加電阻或二極體。在圖5中亦同樣地,可以在負極電源線104與達靈頓電路112的控制端子之間,與齊納二極體ZD1串列地追加電阻或二極體。藉此,能夠進一步增加增壓量。(Modification 1.3)
In FIG. 3 , a resistor or diode may be added in series with the Zener diode ZD1 between the second output terminal OUT2 and the control terminal of the
(變形例1.4)
在實施形態1、實施形態2中,設為線圈L1為無勵磁型的電磁制動器的勵磁線圈,但本發明亦可以運用於勵磁型。這種情況下,能夠藉由縮短消弧時間,來縮短制動的解除時間。(Modification 1.4)
In
(變形例1.5)
關於驅動電路100的驅動對象,並不限定於電磁制動器的勵磁對象,亦能夠利用於電磁離合器的驅動,進而,能夠廣泛地運用於僅向一個方向流動電流即可的負載的驅動。例如,驅動電路100的驅動對象亦可以是僅向一個方向進行旋轉的帶刷子的DC馬達。這種情況下,在電晶體Tr1、電晶體Tr2接通期間,能夠使DC馬達進行旋轉,將它們斷開時,能夠使DC馬達停止。(Modification 1.5)
The driving object of the
(實施形態3)
圖7係具備馬達的控制系統的方塊圖。整流器10對交流電壓進行整流。逆變器20將整流器10產生的直流電壓VDC
轉換為交流電壓,驅動馬達2。(Embodiment 3) FIG. 7 is a block diagram of a control system including a motor.
制動器驅動電路100藉由對電磁制動器4的勵磁線圈切換勵磁(通電)、無勵磁(非通電),來切換開放及制動。The
圖8係具備實施形態3之制動器驅動電路100的電磁制動系統6的電路圖。制動器驅動電路100具備正極電源線102、負極電源線104、全橋電路110、電流檢測電路120、控制器130、閘極驅動器電路140。FIG. 8 is a circuit diagram of the
在正極電源線102與負極電源線104之間,供給電源電壓VPN
。例如,以負極電源線104為基準,將其電位設為0V。全橋電路110與電磁制動器4的勵磁線圈L1連接。在本實施形態中,全橋電路110包含4個臂A1~A4。上臂A1及下臂A3形成第一輸出端子OUT1側的腳,上臂A4及下臂A2形成第二輸出端子OUT2側的腳。在本實施形態中,各臂A1~A4包含功率電晶體和續流二極體(Flywheel diode)(回流二極體)。The power supply voltage V PN is supplied between the positive
電流檢測電路120檢測流過勵磁線圈L1的線圈電流IL
,生成電流檢測訊號S2。控制器130基於指示電磁制動器4的狀態的勵磁指令S1及電流檢測訊號S2,生成指示各臂A1~A4的功率電晶體的接通(ON)、斷開(OFF)的控制訊號S3。閘極驅動器電路140基於控制訊號S3,驅動各臂A1~A4的功率電晶體。The
控制器130響應於指示制動器開放的勵磁指令S1,開始全橋電路110的對角臂A1、A2的電晶體對的驅動。然後,控制器130監視電流檢測訊號S2,當檢測到由電樞的移動開始引起的線圈電流IL
的變動時,使對角臂A1、A2的電晶體對的佔空比降低。In response to the excitation command S1 indicating brake release, the
控制器130中的線圈電流IL
的變動的檢測方法沒有特別限制。例如,控制器130可以包含類比比較器,並將電流檢測訊號S2與臨界值進行比較。或者,可以將電流檢測訊號輸入至高通濾波器,提取尖峰狀的變化。The method of detecting the fluctuation of the coil current IL in the
控制器130可以將電流檢測訊號S2轉換為數位值,藉由數位訊號處理,進行同等的處理。或者,可以藉由波形匹配,對線圈電流IL
的變動進行檢測。The
以上是制動器驅動電路100的構造。接著,對其動作進行說明。圖9(a)係圖8的制動器驅動電路100的動作波形圖。圖9(b)表示比較技術之制動器驅動電路的動作波形圖。The above is the structure of the
參閱圖9(a),對制動器驅動電路100的動作進行說明。在時刻t0
之前,勵磁指令S1為無效(低),線圈電流IL
為零,電磁制動器4為制動狀態。當在時刻t0
使勵磁指令S1有效(高)時,控制器130開始對角臂A1、A2的電晶體對的驅動。在該例子中,剛開始驅動後的佔空比d1為100%,並且固定地被接通。藉此,在勵磁線圈L1的兩端之間,施加與電源電壓VPN
幾乎相等的驅動電壓VL
。然後,當線圈電流IL
增加時,電磁制動器4的力逐漸減弱。然後,當在時刻t1
,電樞開始移動時,在電磁制動器4中產生反電動勢,線圈電流IL
暫時降低。該變化在圖9(a)中以尖峰狀的訊號波形表示。當控制器130檢測到該線圈電流IL
的變化時,使對角臂A1、A2的電晶體對的佔空比減少至小於d1(=100%)的值d2。時刻t1
以後的、施加於電磁制動器4的驅動電壓VL
的有效值(平均值)成為VL
=VPN
×d2。藉此,線圈電流IL
的上升得到抑制,耗電被削減。Referring to FIG. 9(a) , the operation of the
接著,參閱圖9(b)。關於制動器驅動電路100的優點,藉由與比較技術的對比變得明確。在比較技術中,當使勵磁指令S1有效時,對角臂A1、A2的電晶體對固定地被接通。Next, refer to Figure 9(b). The advantages of the
在比較技術中,為了將制動器開放後的保持電流設為與實施形態相同程度,必須將比較技術中的電源電壓VPN ’設計成低於實施形態的電源電壓VPN 。如此一來,在剛使勵磁指令S1有效之後,線圈電流IL 的增加速度變慢,到制動器開放為止的時間t2 變長。相對於此,在實施形態中,與比較技術相比,能夠縮短制動器的開放時間。In the comparative technique, in order to set the holding current after the brake is released to the same level as in the embodiment, the power supply voltage V PN ' in the comparative technique must be designed to be lower than the power supply voltage V PN in the embodiment. As a result, immediately after the excitation command S1 is made effective, the increase rate of the coil current IL becomes slower, and the time t2 until the brake is released becomes longer. On the other hand, in the embodiment, the brake release time can be shortened compared to the comparative technique.
或者,在比較技術中,當將制動器的開放時間設為與實施形態相同程度的情況下,將比較技術中的電源電壓VPN 設為與實施形態的電源電壓VPN 相同電壓位準即可。然而,在比較技術中,在制動器被開放之後,驅動電壓VL 與電源電壓VPN 相等,因此導致制動器開放後的線圈電流(保持電流)變大。相對於此,在實施形態中,與比較技術相比,能夠削減保持電流,能夠減少耗電。Alternatively, when the brake release time in the comparative technique is set to be approximately the same as in the embodiment, the power supply voltage V PN in the comparative technique may be set to the same voltage level as the power supply voltage V PN in the embodiment. However, in the comparative technology, after the brake is released, the drive voltage V L becomes equal to the power supply voltage V PN , thus causing the coil current (holding current) after the brake is released to become large. On the other hand, in the embodiment, compared with the comparative technology, the holding current can be reduced and the power consumption can be reduced.
如上所述,在本實施形態中,可以消除制動器的開放時間與保持電流的權衡取捨的關係,並且能夠兼顧短的開放時間和少的保持電流。As described above, in this embodiment, the trade-off relationship between the brake release time and the holding current can be eliminated, and both a short release time and a small holding current can be achieved.
接著,對與實施形態3相關的變形例進行說明。Next, modifications related to Embodiment 3 will be described.
(變形例3.1)
圖10係變形例3.1之制動器驅動電路100A的電路圖。在該變形例3.1中,全橋電路110A為對角全橋電路,對角臂A3、A4由二極體構成。其他與圖8相同。在該變形例中,亦能夠得到與實施形態相同的效果。(Modification 3.1)
FIG. 10 is a circuit diagram of the
(變形例3.2)
圖11係變形例3.2之全橋電路110B的電路圖。全橋電路110B具備第一電晶體Tr1、第二電晶體Tr2、第一二極體D1、達靈頓電路112、齊納二極體ZD1。第一電晶體Tr1及第二電晶體Tr2為上述的對角臂A1、A2的電晶體對。又,第一二極體D1對應於臂A3,達靈頓電路112及齊納二極體ZD1對應於臂A4。(Modification 3.2)
FIG. 11 is a circuit diagram of the full-
第一電晶體Tr1設置於第一輸出端子OUT1與正極電源線102之間。第一二極體D1設置於第一輸出端子OUT1與負極電源線104之間。第二電晶體Tr2設置於第二輸出端子OUT2與負極電源線104之間。第一電晶體Tr1及第二電晶體Tr2為IGBT(Insulated Gate Bipolar Transistor:絕緣閘雙極電晶體)。The first transistor Tr1 is provided between the first output terminal OUT1 and the positive
達靈頓電路112設置於第二輸出端子OUT2與正極電源線102之間。齊納二極體ZD1設置於達靈頓電路112的閘極(即基極)與第二輸出端子OUT2之間。The
達靈頓電路112包含作為NPN型雙極電晶體的第三電晶體Tr3及第四電晶體Tr4和電阻R1。第三電晶體Tr3的基極與齊納二極體ZD1的陽極連接。第四電晶體Tr4的射極與正極電源線102連接,其集極與第二輸出端子OUT2連接,基極與第三電晶體Tr3的射極連接。電阻R1設置於第三電晶體Tr3的集極與第二輸出端子OUT2之間。The
以上為變形例3.2之全橋電路110B的構造。當使用該全橋電路110B的情況下,亦能夠得到與實施形態相同的效果。接著,對具備該全橋電路110B的制動器驅動電路的施加制動時的動作進行說明。The above is the structure of the full-
圖12係圖11的全橋電路110B的動作波形圖。在時刻t0
之前,係制動器的開放期間,第一電晶體Tr1及第二電晶體Tr2以佔空比d進行開關(switching),在勵磁線圈L1中,向圖11的電路圖中的右方向流過電流量I0
的線圈電流IL
。此外,實際上,在時刻t0
之前,第一輸出端子OUT1、第二輸出端子OUT2的電壓進行開關,但在圖12中簡化表示。FIG. 12 is an operation waveform diagram of the full-
在時刻t0
,當使勵磁指令S1無效(低),產生制動指令時,全橋電路110B的第一電晶體Tr1、第二電晶體Tr2成為斷開。如此一來,線圈電流IL
開始在二極體D1、線圈L1、達靈頓電路112的路徑流動。此時的第一輸出端子OUT1的電壓成為0V,第二輸出端子OUT2的電壓成為VPN
+Vz+2×Vbe。Vz為齊納二極體ZD1的齊納電壓,Vbe為第三電晶體Tr3及第四電晶體Tr4的基極射極間電壓。當視為Vbe≈0的情況下,第二輸出端子OUT2的電壓近似於VPN
+Vz。此時,在線圈L1的兩端之間,施加VL
≈VPN
+Vz。At time t 0 , when the excitation command S1 is deactivated (low) and a braking command is generated, the first transistor Tr1 and the second transistor Tr2 of the
時刻t0 以後的線圈電流IL ,由式(1)表示,隨著時間而減少。 到線圈電流IL 成為0為止的消弧時間τ,由式(2)表示。 The coil current IL after time t 0 is expressed by equation (1) and decreases with time. The arc extinguishing time τ until the coil current IL becomes 0 is expressed by equation (2).
在圖12中,使用圖10的對角橋接電路110A時的動作以一點鏈線表示。此時的消弧時間τ’,在式(3)中給出,消弧時間τ’成為變形例3.2中的消弧時間τ的(VPN
+Vz)/VPN
倍。換言之,依據變形例3.2,能夠將消弧時間縮短至VPN
/(VPN
+Vz)。 In FIG. 12 , the operation when the
在無勵磁型的電磁制動器中,由消弧時間τ規定制動開始的時間。因此,藉由縮短消弧時間τ,能夠實現高速的制動。In a non-excitation type electromagnetic brake, the arc extinguishing time τ determines the time when braking starts. Therefore, by shortening the arc extinguishing time τ, high-speed braking can be achieved.
又,由於驅動電路100B不需要用於驅動電晶體Tr3或電晶體Tr4的閘極驅動電路,因此具有能夠構成為比圖8的全橋電路簡單這一優點。In addition, since the
(變形例3.3)
圖13係變形例3.3之全橋電路110C的電路圖。全橋電路110C具備第一電晶體Tr1、第二電晶體Tr2、二極體D2、達靈頓電路112、齊納二極體ZD1。第一電晶體Tr1及第二電晶體Tr2為上述的對角臂A1、A2的電晶體對。又,達靈頓電路112及齊納二極體ZD1對應於臂A3,二極體D2對應於臂A4。(Modification 3.3)
FIG. 13 is a circuit diagram of the full-
變形例3.3與變形例3.2的不同點為達靈頓電路112的位置,具體而言,變更為在第一輸出端子OUT1與負極電源線104之間。The difference between Modification 3.3 and Modification 3.2 is that the position of the
圖14係圖13的全橋電路110C的動作波形圖。在時刻t0
之前,係制動器的開放期間,第一電晶體Tr1及第二電晶體Tr2以佔空比d進行開關,在勵磁線圈L1中,向圖13的電路圖中的右方向流過電流量I0
的線圈電流IL
。此外,實際上,在時刻t0
之前,第一輸出端子OUT1、第二輸出端子OUT2的電壓進行開關,但在圖12中簡化表示。FIG. 14 is an operation waveform diagram of the full-
在時刻t0
中,當使勵磁指令S1無效,產生制動指令時,驅動電路100B的第一電晶體Tr1、第二電晶體Tr2成為斷開。如此一來,線圈電流IL
開始在達靈頓電路112、線圈L1、二極體D2的路徑流動。此時的第一輸出端子OUT1的電壓成為-(Vz+2×Vbe),第二輸出端子OUT2的電壓成為VPN
。此時,在線圈L1的兩端之間,施加VL
≈VPN
+Vz。At time t 0 , when the excitation command S1 is deactivated and a braking command is generated, the first transistor Tr1 and the second transistor Tr2 of the
與變形例3.2同樣地,時刻t0 以後的線圈電流IL ,由式(1)表示,隨著時間而減少。然後,到線圈電流IL 成為0為止的消弧時間τ,由式(2)表示。如上所述,在變形例3.3中,亦與變形例3.2同樣地,能夠縮短消弧時間τ。Like Modification 3.2, the coil current IL after time t 0 is expressed by equation (1) and decreases with time. Then, the arc extinguishing time τ until the coil current IL becomes 0 is expressed by equation (2). As described above, in Modification 3.3, similarly to Modification 3.2, the arc extinguishing time τ can be shortened.
作為第一電晶體Tr1或第二電晶體Tr2,能夠使用雙極電晶體、MOSFET(Metal Oxide Semiconductor Field Effect Transistor:金屬氧半導體場效應電晶體)、GaN-HEMT (High Electron Mobility Transistor:高電子遷移率電晶體)等功率電晶體,來代替IGBT。As the first transistor Tr1 or the second transistor Tr2, a bipolar transistor, a MOSFET (Metal Oxide Semiconductor Field Effect Transistor), or a GaN-HEMT (High Electron Mobility Transistor) can be used. rate transistor) and other power transistors to replace IGBT.
達靈頓電路112的構造並不限定於圖示的電路。在圖11或圖13中,示出了2段的達靈頓電路,亦可以由3段以上構成。又,電晶體Tr3或電晶體Tr4可以由FET構成。這種情況下,在圖11的構造中,可以在作為達靈頓電路112的控制端子的閘極與正極電源線102之間,追加包含電阻等的電流路徑。或者,在圖13的構造中,可以在作為達靈頓電路112的控制端子的閘極與負極電源線104的第一輸出端子OUT1之間,追加包含電阻等的電流路徑。The structure of the
在圖11中,亦可以在第二輸出端子OUT2與達靈頓電路112的控制端子之間,與齊納二極體ZD1串列地追加電阻或二極體。在圖13中亦同樣地,可以在負極電源線104與達靈頓電路112的控制端子之間,與齊納二極體ZD1串列地追加電阻或二極體。藉此,能夠進一步增加增壓量。In FIG. 11 , a resistor or diode may be added in series with the Zener diode ZD1 between the second output terminal OUT2 and the control terminal of the
基於實施形態,使用具體的詞語,對本揭示或者本發明進行了說明,但實施形態僅示出了本揭示或者本發明的原理、應用的一個側面,對實施形態,在不脫離申請專利範圍中所規定的本發明的思想的範圍中,允許許多變形例或配置的變更。 [產業上之可利用性]The disclosure or the present invention has been described based on the embodiments using specific words, but the embodiments only show one aspect of the principles and applications of the disclosure or the invention. The embodiments should not depart from the scope of the patent application. Many modifications and configuration changes are allowed within the scope of the stipulated idea of the present invention. [Industrial availability]
本發明有關一種感應負載的驅動電路。The invention relates to a driving circuit for an inductive load.
100:驅動電路 OUT1:第一輸出端子 OUT2:第二輸出端子 Tr1:第一電晶體 Tr2:第二電晶體 Tr3:第三電晶體 Tr4:第四電晶體 D1:第一二極體 D2:第二二極體 102:正極電源線 104:負極電源線 110:達靈頓電路 ZD1:齊納二極體 R1:電阻100:Drive circuit OUT1: The first output terminal OUT2: The second output terminal Tr1: first transistor Tr2: second transistor Tr3: The third transistor Tr4: The fourth transistor D1: first diode D2: Second diode 102: Positive power cord 104: Negative power cord 110: Darlington Circuit ZD1: Zener diode R1: Resistor
[圖1]係具備馬達的控制系統的方塊圖。
[圖2(a)]、[圖2(b)]係表示制動器驅動電路的構造例子的電路圖。
[圖3]係實施形態1之驅動電路的電路圖。
[圖4]係圖3的驅動電路的動作波形圖。
[圖5]係實施形態2之驅動電路的電路圖。
[圖6]係圖5的驅動電路的動作波形圖。
[圖7]係具備馬達的控制系統的方塊圖。
[圖8]係實施形態3之制動器驅動電路的電路圖。
[圖9]中,圖9(a)係圖8的制動器驅動電路的動作波形圖,圖9(b)表示比較技術之制動器驅動電路的動作波形圖。
[圖10]係變形例3.1之制動器驅動電路的電路圖。
[圖11]係變形例3.2之全橋電路的電路圖。
[圖12]係圖11的全橋電路的動作波形圖。
[圖13]係變形例3.3之全橋電路的電路圖。
[圖14]係圖13的全橋電路的動作波形圖。[Fig. 1] is a block diagram of a control system including a motor.
[Fig. 2(a)] and [Fig. 2(b)] are circuit diagrams showing structural examples of the brake drive circuit.
[Fig. 3] is a circuit diagram of the drive circuit according to
Claims (8)
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JP2020055465A JP7445486B2 (en) | 2020-03-26 | 2020-03-26 | Brake drive circuit and electromagnetic brake system |
JP2020055464A JP7445485B2 (en) | 2020-03-26 | 2020-03-26 | Inductive load drive circuit and electromagnetic brake system |
JP2020-055464 | 2020-03-26 |
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Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61220523A (en) * | 1985-03-27 | 1986-09-30 | Honda Motor Co Ltd | Switching circuit |
JPS6461940A (en) * | 1987-09-02 | 1989-03-08 | Fuji Electric Co Ltd | Semiconductor element |
JP2006002807A (en) * | 2004-06-15 | 2006-01-05 | Ogura Clutch Co Ltd | Armature attraction detection method and device |
TWI484716B (en) * | 2008-10-03 | 2015-05-11 | Access Business Group Int Llc | Method and apparatus for reducing poewr consumption in power system |
JP2018126017A (en) * | 2017-02-03 | 2018-08-09 | 住友重機械工業株式会社 | Brake drive circuit |
TW201830843A (en) * | 2016-10-31 | 2018-08-16 | 日商油研工業股份有限公司 | Inductive load drive circuit especially applicable to the solenoid or motor controlled by pulse width modulation and having energy recovery |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3525883A (en) * | 1967-07-28 | 1970-08-25 | Dover Corp | Bridge amplifier circuit |
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- 2021-03-19 WO PCT/JP2021/011460 patent/WO2021193456A1/en active Application Filing
- 2021-03-22 TW TW110110139A patent/TWI825399B/en active
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS61220523A (en) * | 1985-03-27 | 1986-09-30 | Honda Motor Co Ltd | Switching circuit |
JPS6461940A (en) * | 1987-09-02 | 1989-03-08 | Fuji Electric Co Ltd | Semiconductor element |
JP2006002807A (en) * | 2004-06-15 | 2006-01-05 | Ogura Clutch Co Ltd | Armature attraction detection method and device |
TWI484716B (en) * | 2008-10-03 | 2015-05-11 | Access Business Group Int Llc | Method and apparatus for reducing poewr consumption in power system |
TW201830843A (en) * | 2016-10-31 | 2018-08-16 | 日商油研工業股份有限公司 | Inductive load drive circuit especially applicable to the solenoid or motor controlled by pulse width modulation and having energy recovery |
JP2018126017A (en) * | 2017-02-03 | 2018-08-09 | 住友重機械工業株式会社 | Brake drive circuit |
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