TWI787845B - Inverter - Google Patents

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TWI787845B
TWI787845B TW110119289A TW110119289A TWI787845B TW I787845 B TWI787845 B TW I787845B TW 110119289 A TW110119289 A TW 110119289A TW 110119289 A TW110119289 A TW 110119289A TW I787845 B TWI787845 B TW I787845B
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unit
voltage
inductive load
inverter
output voltage
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TW110119289A
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TW202247589A (en
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陳浩銘
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應能科技股份有限公司
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Priority to TW110119289A priority Critical patent/TWI787845B/en
Priority to CN202110813405.7A priority patent/CN115411948A/en
Priority to CN202121641541.4U priority patent/CN215956276U/en
Publication of TW202247589A publication Critical patent/TW202247589A/en
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
    • H02M5/40—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases with intermediate conversion into dc
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/32—Means for protecting converters other than automatic disconnection
    • 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
    • H02P27/00—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage
    • H02P27/04—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
    • H02P27/06—Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using dc to ac converters or inverters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J2207/00—Indexing scheme relating to details of circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J2207/50—Charging of capacitors, supercapacitors, ultra-capacitors or double layer capacitors

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Inverter Devices (AREA)
  • Confectionery (AREA)
  • Glass Compositions (AREA)
  • External Artificial Organs (AREA)
  • Ac-Ac Conversion (AREA)
  • Supply And Distribution Of Alternating Current (AREA)
  • Control Of Ac Motors In General (AREA)

Abstract

一種變頻器包含一整流單元、一逆變單元、一電容單元、及一控制單元。該整流單元接收來自一交流電源的一交流電壓，並將該交流電壓轉換為一直流輸入電壓。該電容單元包括至少一超級電容，並電連接於該整流單元與該逆變單元之間，以對該直流輸入電壓進行濾波與穩壓。該控制單元電連接該逆變單元，以控制該逆變單元將該直流輸入電壓轉換為一交流輸出電壓，進而將該交流輸出電壓輸出至一電感性負載，且還控制該交流輸出電壓的一頻率的大小或一振幅的大小。該電容單元能夠吸收並儲存來自該電感性負載的一反向電動勢的能量。A frequency converter includes a rectifying unit, an inverter unit, a capacitor unit and a control unit. The rectifying unit receives an AC voltage from an AC power source, and converts the AC voltage into a DC input voltage. The capacitor unit includes at least one supercapacitor and is electrically connected between the rectifier unit and the inverter unit to filter and stabilize the DC input voltage. The control unit is electrically connected to the inverter unit to control the inverter unit to convert the DC input voltage into an AC output voltage, and then output the AC output voltage to an inductive load, and also controls an AC output voltage. The magnitude of the frequency or the magnitude of an amplitude. The capacitor unit can absorb and store the energy of a reverse electromotive force from the inductive load.

Description

變頻器Inverter

本發明是有關於一種變頻器，特別是指一種不需要洩放電阻的變頻器。The invention relates to a frequency converter, in particular to a frequency converter that does not need a discharge resistor.

變頻器(Variable-frequency Drive，VFD)，也稱為變頻驅動器或驅動控制器或驅動器，是應用變頻驅動技術以改變交流馬達的工作電壓的頻率或振幅，而能夠平滑地控制交流馬達的速度及轉矩。參閱圖1，習知的變頻器適用於一交流電源98及一電感性負載99，並包含一整流單元91、一逆變單元92、一濾波電容94、一控制單元93、及一制動單元95。該整流單元91接收來自該交流電源98的一交流電壓V1，並將該交流電壓V1轉換為一直流輸入電壓V2。該逆變單元92電連接該整流單元91及該電感性負載99。該控制單元93電連接該逆變單元92，以控制該逆變單元92將來自該整流單元91的該直流輸入電壓V2轉換為一交流輸出電壓V3，進而將該交流輸出電壓V3輸出至該電感性負載99，且還控制該交流輸出電壓V3的一頻率的大小或一振幅的大小。Inverter (Variable-frequency Drive, VFD), also known as variable-frequency drive or drive controller or drive, is the application of variable-frequency drive technology to change the frequency or amplitude of the operating voltage of the AC motor, and can smoothly control the speed of the AC motor and torque. Referring to Fig. 1, the conventional frequency converter is suitable for an AC power supply 98 and an inductive load 99, and includes a rectifying unit 91, an inverter unit 92, a filter capacitor 94, a control unit 93, and a braking unit 95 . The rectification unit 91 receives an AC voltage V1 from the AC power source 98 and converts the AC voltage V1 into a DC input voltage V2. The inverter unit 92 is electrically connected to the rectification unit 91 and the inductive load 99 . The control unit 93 is electrically connected to the inverter unit 92 to control the inverter unit 92 to convert the DC input voltage V2 from the rectifier unit 91 into an AC output voltage V3, and then output the AC output voltage V3 to the electric circuit. The inductive load 99 also controls a frequency or an amplitude of the AC output voltage V3.

該濾波電容94是一種電解電容，並電連接於該整流單元91及該逆變單元92之間，以對該直流輸入電壓V2進行濾波與穩壓。該制動單元95包含一洩壓開關952及一洩壓電阻951。該洩壓開關952與該洩壓電路串聯於該濾波電容94的一端與接地點之間，該洩壓電阻951是一種功率電阻，該洩壓開關952受到其他偵測電路或元件的控制，當該電感性負載99沒有產生該反向電動勢時，該洩壓開關952不導通。而當該電感性負載99產生一反向電動勢時，該洩壓開關952受到控制而導通，使得該反向電動勢所產生的能量經由該洩放開關及該洩放電阻的導通路徑而宣洩，以避免損壞該逆變單元92、該濾波電容94、或該整流單元91之其中任一者。因此，在習知的變頻器之中，只要所採用的該濾波電容94勢一種電解電容，則該變頻器必定需要包含該制動單元95，以避免該電感性負載99所產生的該反向電動勢破壞該變頻器的元件。The filter capacitor 94 is an electrolytic capacitor and is electrically connected between the rectifier unit 91 and the inverter unit 92 to filter and stabilize the DC input voltage V2. The braking unit 95 includes a pressure relief switch 952 and a pressure relief resistor 951 . The pressure relief switch 952 and the pressure relief circuit are connected in series between one end of the filter capacitor 94 and the ground point. The pressure relief resistor 951 is a power resistor, and the pressure relief switch 952 is controlled by other detection circuits or components. When the inductive load 99 does not generate the back electromotive force, the pressure relief switch 952 is not turned on. And when the inductive load 99 generates a back electromotive force, the pressure relief switch 952 is controlled and turned on, so that the energy generated by the back electromotive force is released through the conduction path of the bleed switch and the bleed resistor, so that Avoid damaging any one of the inverter unit 92 , the filter capacitor 94 , or the rectifier unit 91 . Therefore, in the conventional frequency converter, as long as the filter capacitor 94 used is an electrolytic capacitor, the frequency converter must include the braking unit 95 to avoid the reverse electromotive force generated by the inductive load 99 Destroy the components of the frequency converter.

因此，本發明的目的，即在提供一種不需要洩放電阻的變頻器。Therefore, the object of the present invention is to provide a frequency converter that does not require a bleeder resistor.

於是，本發明提供一種變頻器，適用於一交流電源及一電感性負載，並包含一整流單元、一逆變單元、一電容單元、及一控制單元。Therefore, the present invention provides a frequency converter, which is suitable for an AC power supply and an inductive load, and includes a rectifying unit, an inverter unit, a capacitor unit, and a control unit.

該整流單元接收來自該交流電源的一交流電壓，並將該交流電壓轉換為一直流輸入電壓。該逆變單元電連接該整流單元以接收該直流輸入電壓，並受控制以將該直流輸入電壓轉換為一交流輸出電壓，該逆變單元還電連接該電感性負載，以將該交流輸出電壓輸出至該電感性負載。The rectifying unit receives an AC voltage from the AC power source, and converts the AC voltage into a DC input voltage. The inverter unit is electrically connected to the rectifier unit to receive the DC input voltage and is controlled to convert the DC input voltage into an AC output voltage. The inverter unit is also electrically connected to the inductive load to receive the AC output voltage. output to the inductive load.

該電容單元包括至少一超級電容，並電連接於該整流單元與該逆變單元之間，以對該直流輸入電壓進行濾波與穩壓。該控制單元電連接該逆變單元，以控制該逆變單元產生該交流輸出電壓，且還控制該交流輸出電壓的一頻率的大小或一振幅的大小。The capacitor unit includes at least one supercapacitor and is electrically connected between the rectifier unit and the inverter unit to filter and stabilize the DC input voltage. The control unit is electrically connected to the inverter unit to control the inverter unit to generate the AC output voltage, and also controls a frequency or an amplitude of the AC output voltage.

在一些實施態樣中，其中，當該電感性負載產生一反向電動勢時，該電容單元的該至少一超級電容能夠吸收並儲存該反向電動勢的能量，使得該直流輸入電壓仍然保持穩定，而不損壞該整流單元或該逆變單元。In some implementation aspects, when the inductive load generates a back electromotive force, the at least one supercapacitor of the capacitor unit can absorb and store the energy of the back electromotive force, so that the DC input voltage remains stable, without damaging the rectifier unit or the inverter unit.

在一些實施態樣中，其中，當該電感性負載產生該反向電動勢之後，且該控制單元再次控制該逆變單元產生該交流輸出電壓時，該電容單元所儲存的該反向電動勢的能量能夠經由該逆變單元傳送至該電感性負載。In some implementation aspects, when the inductive load generates the back electromotive force and the control unit again controls the inverter unit to generate the AC output voltage, the energy of the back electromotive force stored in the capacitor unit It can be transmitted to the inductive load via the inverter unit.

在一些實施態樣中，其中，該電感性負載是一馬達，該交流輸出電壓驅動該馬達運轉，當該馬達減速或煞車時，該馬達產生該反向電動勢。In some embodiments, the inductive load is a motor, the AC output voltage drives the motor to run, and when the motor decelerates or brakes, the motor generates the reverse electromotive force.

本發明的功效在於：藉由電連接於該整流單元及該逆變單元之間的該電容單元是包含至少一超級電容，使得該變頻器能夠不需要使用習知的制動單元，即能夠利用超級電容的元件特性，有效地吸收並儲存該電感性負載所產生的該反向電動勢的能量。The effect of the present invention is that: the capacitor unit electrically connected between the rectifier unit and the inverter unit includes at least one supercapacitor, so that the frequency converter can use the supercapacitor without using a conventional braking unit. The element characteristic of the capacitor is to effectively absorb and store the energy of the reverse electromotive force generated by the inductive load.

在本發明被詳細描述之前，應當注意在以下的說明內容中，類似的元件是以相同的編號來表示。Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same numerals.

參閱圖1，本發明變頻器之一實施例，適用於一交流電源8及一電感性負載9，並包含一整流單元1、一逆變單元2、一電容單元4、及一控制單元3。在本實施例中，該電感性負載9是一個或多個馬達，且都是一種交流馬達。該交流電源8例如是一市電。該變頻器(VFD)用於將來自該交流電源8的一交流電壓V1，轉換為一直流輸入電壓V2，再轉換為一交流輸出電壓V3，以能夠平滑地控制該馬達的速度及轉矩。Referring to FIG. 1 , an embodiment of the frequency converter of the present invention is suitable for an AC power source 8 and an inductive load 9 , and includes a rectifier unit 1 , an inverter unit 2 , a capacitor unit 4 , and a control unit 3 . In this embodiment, the inductive load 9 is one or more motors, all of which are AC motors. The AC power source 8 is, for example, a commercial power supply. The frequency converter (VFD) is used to convert an AC voltage V1 from the AC power source 8 into a DC input voltage V2 and then into an AC output voltage V3 to smoothly control the speed and torque of the motor.

該整流單元1電連接該交流電源8以接收該交流電壓V1，並將該交流電壓V1轉換為該直流輸入電壓V2。該整流單元1例如是一種橋式整流器，也就是一種交流直流轉換器。The rectifying unit 1 is electrically connected to the AC power source 8 to receive the AC voltage V1 and convert the AC voltage V1 into the DC input voltage V2. The rectification unit 1 is, for example, a bridge rectifier, that is, an AC-DC converter.

該逆變單元2電連接該整流單元1以接收該直流輸入電壓V2，並受到該控制單元3的控制以將該直流輸入電壓V2轉換為該交流輸出電壓V3，也就是一種直流交流轉換器，且用於對所輸出的該交流輸出電壓V3作振幅(即電壓大小)的改變及相位調變(或頻率調變)。該逆變單元2還電連接該電感性負載9，以將該交流輸出電壓V3輸出至該電感性負載9。The inverter unit 2 is electrically connected to the rectifier unit 1 to receive the DC input voltage V2, and is controlled by the control unit 3 to convert the DC input voltage V2 into the AC output voltage V3, that is, a DC-AC converter, And it is used to change the amplitude (ie voltage magnitude) and phase modulation (or frequency modulation) of the output AC output voltage V3. The inverter unit 2 is also electrically connected to the inductive load 9 to output the AC output voltage V3 to the inductive load 9 .

該電容單元4包括至少一超級電容，例如是一個超級電容，並電連接於該整流單元1與該逆變單元2之間，以對該直流輸入電壓V2進行濾波與穩壓。該超級電容又稱雙電層電容(EDLC)，是一種擁有高能量密度的電化學電容器，相較於傳統的電解電容的容量往往高上數百倍至數千倍不等。舉例來說，先前技術所採用的電解電容形式的濾波電容的數值大約是幾百微法拉(uF)，而本案的該超級電容的數值例如是2.65法拉(F)，但不以此大小為限。The capacitor unit 4 includes at least one supercapacitor, such as a supercapacitor, and is electrically connected between the rectifier unit 1 and the inverter unit 2 to filter and stabilize the DC input voltage V2. The supercapacitor, also known as the electric double layer capacitor (EDLC), is an electrochemical capacitor with high energy density. Compared with the traditional electrolytic capacitor, the capacity is often hundreds to thousands of times higher. For example, the value of the filter capacitor in the form of an electrolytic capacitor used in the prior art is about several hundred microfarads (uF), while the value of the supercapacitor in this case is, for example, 2.65 Farads (F), but it is not limited to this size .

該控制單元3電連接該逆變單元2，以控制該逆變單元2產生該交流輸出電壓V3，且還控制該交流輸出電壓V3的一相位(或頻率)的大小及一振幅的大小，以藉由相位(或頻率)的不同控制例如該馬達的轉速大小，及藉由電壓的大小控制例如該馬達的扭力大小。該控制單元3例如是一種微控制器(MCU)，或是其他已知用於控制逆變單元2的控制電路。The control unit 3 is electrically connected to the inverter unit 2 to control the inverter unit 2 to generate the AC output voltage V3, and also controls a phase (or frequency) and an amplitude of the AC output voltage V3, so as to For example, the rotational speed of the motor is controlled by the difference in phase (or frequency), and the torque of the motor is controlled by the magnitude of the voltage. The control unit 3 is, for example, a microcontroller (MCU), or other known control circuits for controlling the inverter unit 2 .

舉例來說，該馬達應用於驅動一電梯的上升或下降。當該電梯上升時，該變頻器的該控制單元3藉由控制該交流輸出電壓V3的該頻率或該振幅的大小，而能夠平滑地控制該馬達的速度及轉矩，使得該電梯平穩地上升。而當該電梯下降時，該馬達(即該電感性負載9)產生一反向電動勢，此時，該電容單元4的該超級電容能夠吸收並儲存該反向電動勢的能量，使得該直流輸入電壓V2仍然保持穩定，而不損壞該整流單元1或該逆變單元2。For example, the motor is used to drive an elevator up or down. When the elevator goes up, the control unit 3 of the frequency converter can smoothly control the speed and torque of the motor by controlling the frequency or the amplitude of the AC output voltage V3, so that the elevator goes up smoothly . And when the elevator descends, the motor (i.e. the inductive load 9) produces a back electromotive force, at this moment, the supercapacitor of the capacitor unit 4 can absorb and store the energy of the back electromotive force, so that the DC input voltage V2 remains stable without damaging the rectifying unit 1 or the inverter unit 2 .

再者，當該馬達產生該反向電動勢之後，且該控制單元3再次控制該逆變單元2產生該交流輸出電壓V3時，如該電梯再次上升時，該電容單元4所儲存的該反向電動勢的能量能夠經由該逆變單元2傳送至該電感性負載9，而達到節省來自該交流電源98所需要的電力。舉例來說，本案變頻器應用於電梯時，即該電感性負載9是驅動電梯上升與下降的馬達時，相較於先前技術(採用傳統電容)能夠節省能源達到百分之六十甚至更多的效果。Furthermore, after the motor generates the reverse electromotive force, and the control unit 3 controls the inverter unit 2 to generate the AC output voltage V3 again, if the elevator rises again, the reverse voltage stored in the capacitor unit 4 The energy of the electromotive force can be transmitted to the inductive load 9 via the inverter unit 2 , so as to save the power required by the AC power source 98 . For example, when the frequency converter in this case is applied to an elevator, that is, when the inductive load 9 is a motor that drives the elevator up and down, it can save energy by 60% or more compared to the previous technology (using traditional capacitors) Effect.

換句話說，當該馬達減速或煞車時，該馬達所產生的該反向電動勢的能量，能夠儲存於該電容單元4的該超級電容中，且還能夠再作為該馬達下次運轉的能量。相較於先前技術是利用一制動單元的一洩放電阻單純地將該反向電動勢的能量作消耗以避免損壞變頻器，本案藉由超級電容不但能夠保護變頻器的其他元件避免損壞，還能夠將該反向電動勢的能量加以儲存與再利用。此外，由於超級電容相較於電解電容的體積更小，都能夠有效地簡化變頻器的設計與體積。In other words, when the motor decelerates or brakes, the energy of the back electromotive force generated by the motor can be stored in the supercapacitor of the capacitor unit 4 and can be used as energy for the next operation of the motor. Compared with the previous technology which uses a bleeder resistor of a braking unit to simply consume the energy of the back electromotive force to avoid damage to the inverter, the supercapacitor in this case can not only protect other components of the inverter from damage, but also The energy of the back electromotive force is stored and reused. In addition, since the supercapacitor is smaller than the electrolytic capacitor, it can effectively simplify the design and volume of the inverter.

另外要特別補充說明的是：為使圖式簡單說明起見，圖1與圖2都僅繪出單一迴路，事實上，該交流電壓V1及該交流輸出電壓V3都是一種三相電壓，並具備對應的三相迴路。In addition, it should be added that: for the sake of simple explanation of the diagrams, only a single circuit is drawn in Figure 1 and Figure 2. In fact, the AC voltage V1 and the AC output voltage V3 are a three-phase voltage, and It has a corresponding three-phase circuit.

綜上所述，藉由電連接於該整流單元1及該逆變單元2之間的該電容單元4是包含至少一超級電容，使得該變頻器能夠不需要使用習知的制動單元，即能夠利用超級電容的元件特性，有效地吸收並儲存該電感性負載9所產生的該反向電動勢的能量，故確實能達成本發明的目的。In summary, the capacitor unit 4 electrically connected between the rectifier unit 1 and the inverter unit 2 includes at least one supercapacitor, so that the frequency converter does not need to use a conventional braking unit, that is, it can Utilizing the element characteristics of the supercapacitor can effectively absorb and store the energy of the reverse electromotive force generated by the inductive load 9, so the object of the present invention can be achieved indeed.

惟以上所述者，僅為本發明的實施例而已，當不能以此限定本發明實施的範圍，凡是依本發明申請專利範圍及專利說明書內容所作的簡單的等效變化與修飾，皆仍屬本發明專利涵蓋的範圍內。But the above-mentioned ones are only embodiments of the present invention, and should not limit the scope of the present invention. All simple equivalent changes and modifications made according to the patent scope of the present invention and the content of the patent specification are still within the scope of the present invention. Within the scope covered by the patent of the present invention.

1:整流單元 2:逆變單元 3:控制單元 4:電容單元 8:交流電源 9:電感性負載 91:整流單元 92:逆變單元 93:控制單元 94:濾波電容 95:制動單元 951:洩壓電阻 952:洩壓開關 98:交流電源 99:電感性負載 V1:交流電壓 V2:直流輸入電壓 V3:交流輸出電壓 1: rectifier unit 2: inverter unit 3: Control unit 4: Capacitor unit 8: AC power supply 9: Inductive load 91: rectifier unit 92: inverter unit 93: Control unit 94: filter capacitor 95: brake unit 951: Pressure relief resistor 952: pressure relief switch 98: AC power supply 99: Inductive load V1: AC voltage V2: DC input voltage V3: AC output voltage

本發明的其他的特徵及功效，將於參照圖式的實施方式中清楚地呈現，其中： 圖1是一方塊圖，說明習知的一種變頻器；及 圖2是一方塊圖，說明本發明變頻器的一實施例。 Other features and effects of the present invention will be clearly presented in the implementation manner with reference to the drawings, wherein: Figure 1 is a block diagram illustrating a known frequency converter; and Fig. 2 is a block diagram illustrating an embodiment of the frequency converter of the present invention.

1:整流單元 2:逆變單元 3:控制單元 4:電容單元 8:交流電源 9:電感性負載 V1:交流電壓 V2:直流輸入電壓 V3:交流輸出電壓 1: rectifier unit 2: inverter unit 3: Control unit 4: Capacitor unit 8: AC power supply 9: Inductive load V1: AC voltage V2: DC input voltage V3: AC output voltage

Claims (4)

一種變頻器，適用於一交流電源及一電感性負載，並包含：一整流單元，接收來自該交流電源的一交流電壓，並將該交流電壓轉換為一直流輸入電壓；一逆變單元，電連接該整流單元以接收該直流輸入電壓，並受控制以將該直流輸入電壓轉換為一交流輸出電壓，該逆變單元還電連接該電感性負載，以將該交流輸出電壓輸出至該電感性負載；一電容單元，包括至少一超級電容，並直接電連接於該整流單元與該逆變單元之間，以對該直流輸入電壓進行濾波與穩壓；及一控制單元，電連接該逆變單元，以控制該逆變單元產生該交流輸出電壓，且還控制該交流輸出電壓的一頻率的大小或一振幅的大小。 A frequency converter is suitable for an AC power supply and an inductive load, and includes: a rectification unit, which receives an AC voltage from the AC power supply, and converts the AC voltage into a DC input voltage; The rectifier unit is connected to receive the DC input voltage and is controlled to convert the DC input voltage into an AC output voltage. The inverter unit is also electrically connected to the inductive load to output the AC output voltage to the inductive load. Load; a capacitor unit, including at least one super capacitor, and directly electrically connected between the rectifier unit and the inverter unit, to filter and stabilize the DC input voltage; and a control unit, electrically connected to the inverter The unit is used to control the inverter unit to generate the AC output voltage, and also controls a frequency or an amplitude of the AC output voltage. 如請求項1所述的變頻器，其中，當該電感性負載產生一反向電動勢時，該電容單元的該至少一超級電容能夠吸收並儲存該反向電動勢的能量，使得該直流輸入電壓仍然保持穩定，而不損壞該整流單元或該逆變單元。 The frequency converter according to claim 1, wherein when the inductive load generates a back electromotive force, the at least one supercapacitor of the capacitor unit can absorb and store the energy of the back electromotive force, so that the DC input voltage remains Keep stable without damaging the rectifier unit or the inverter unit. 如請求項2所述的變頻器，其中，當該電感性負載產生該反向電動勢之後，且該控制單元再次控制該逆變單元產生該交流輸出電壓時，該電容單元所儲存的該反向電動勢的能量能夠經由該逆變單元傳送至該電感性負載。 The frequency converter according to claim 2, wherein, after the inductive load generates the reverse electromotive force, and the control unit controls the inverter unit to generate the AC output voltage again, the reverse voltage stored in the capacitor unit The energy of the electromotive force can be transmitted to the inductive load via the inverter unit. 如請求項3所述的變頻器，其中，該電感性負載是一馬達，該交流輸出電壓驅動該馬達運轉，當該馬達減速或煞車 時，該馬達產生該反向電動勢。The frequency converter as described in claim 3, wherein the inductive load is a motor, and the AC output voltage drives the motor to run, when the motor decelerates or brakes , the motor generates the back electromotive force.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030089557A1 (en) * 2000-03-31 2003-05-15 Thomas Eilinger Device and method for reducing the power of the supply connection in lift systems
CN102723763A (en) * 2012-06-04 2012-10-10 天津大学 Super-capacitor energy storage type quick elevator charge protection controller
TW202002479A (en) * 2018-06-11 2020-01-01 日商三菱電機股份有限公司 Convertor and motor control device
TWM614934U (en) * 2021-05-27 2021-07-21 應能科技股份有限公司 Convertor

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20030089557A1 (en) * 2000-03-31 2003-05-15 Thomas Eilinger Device and method for reducing the power of the supply connection in lift systems
CN102723763A (en) * 2012-06-04 2012-10-10 天津大学 Super-capacitor energy storage type quick elevator charge protection controller
TW202002479A (en) * 2018-06-11 2020-01-01 日商三菱電機股份有限公司 Convertor and motor control device
TWM614934U (en) * 2021-05-27 2021-07-21 應能科技股份有限公司 Convertor

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