TWI459673B - Power switch series circuit, control method thereof, and multilevel power conversion apparatus - Google Patents
Power switch series circuit, control method thereof, and multilevel power conversion apparatus Download PDFInfo
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Description
本發明係有關於功率開關的串聯技術，特別係有關於功率開關串聯電路的設計和控制方法。 The present invention relates to a series technique of power switches, and more particularly to a method of designing and controlling a power switch series circuit.
當前，在高壓大功率變換器中，對於功率器件要求具有較高的耐壓值，但單個的功率器件顯然無法滿足這一要求。現有的一種解決方式是，使用多個功率開關器件直接串聯。例如，功率開關器件可以是晶閘管、門控可關斷晶閘管、絕緣閘雙極型電晶體(IGBT，Insulated Gate Bipolar Transistor)，它們可應用于高壓直流電路、靜態可變補償器和高壓逆變器等電子設備中。 Currently, in high-voltage high-power converters, high voltage values are required for power devices, but a single power device obviously cannot meet this requirement. One existing solution is to use multiple power switching devices in series. For example, the power switching device can be a thyristor, a gated turn-off thyristor, an insulated gate bipolar transistor (IGBT), which can be applied to a high voltage direct current circuit, a static variable compensator, and a high voltage inverter. In electronic devices.
但是，採用晶閘管、門控可關斷晶閘管等傳統器件進行串聯連接時，功率損耗大、開關速度慢，因而無法在脈衝寬度調變(PWM)變流裝置中得到廣泛應用。相比之下，IGBT作為上世紀八十年代出現的一種新型半導體功率器件，不僅具有電壓控制輸入特性、低阻通態輸出特性，而且IGBT的開關速度很快，完全能夠滿足PWM變流技術的要求。另一方面，儘管串聯電路中各IGBT指標、閘極控制信號電路完全相同，但由於各IGBT的性能、開關速度的差異，閘極控制信號線路元器件參數的不一致，線路存在分佈電感、分佈 電容等因素，往往會造成IGBT的開關動作不一致，進而造成個別IGBT器件在開關瞬間，集極與射極之間的電壓超過其額定的耐壓值，損壞該功率器件。此外，在功率開關串聯電路中，如果因某些故障使IGBT器件在導通期間出現過電流，一旦未有效檢測出過流情形，將會使IGBT器件因過流而失效。 However, when a conventional device such as a thyristor or a gated turn-off thyristor is connected in series, the power loss is large and the switching speed is slow, so that it cannot be widely used in a pulse width modulation (PWM) converter device. In contrast, IGBT is a new type of semiconductor power device that appeared in the 1980s. It not only has voltage control input characteristics, low resistance on-state output characteristics, but also has fast switching speed of IGBT, which can fully meet the PWM converter technology. Claim. On the other hand, although the IGBT index and the gate control signal circuit in the series circuit are identical, due to the difference in performance and switching speed of each IGBT, the parameters of the gate control signal line components are inconsistent, and the line has distributed inductance and distribution. Factors such as capacitance often cause inconsistent switching behavior of the IGBT, which in turn causes individual IGBT devices to switch at an instant, and the voltage between the collector and the emitter exceeds its rated withstand voltage value, damaging the power device. In addition, in the power switch series circuit, if an overcurrent occurs during the turn-on of the IGBT device due to some faults, once the overcurrent condition is not effectively detected, the IGBT device will be disabled due to overcurrent.
有鑑於此，如何對現有的功率開關串聯電路進行改進，以便在電路出現異常情形時能夠快速地保護功率開關，提升串聯電路的運行可靠性，是業內相關技術人員亟待解決的一項課題。 In view of this, how to improve the existing power switch series circuit, in order to quickly protect the power switch in the abnormal situation of the circuit, and improve the operational reliability of the series circuit is an urgent problem to be solved by the relevant technical personnel in the industry.
本發明內容之一目的是在提供一種新型的功率開關串聯電路及其控制方法。 It is an object of the present invention to provide a novel power switch series circuit and a control method therefor.
為達上述目的，本發明內容之一技術樣態係關於一種功率開關串聯電路，該功率開關串聯電路包括多個串聯模組、一比較模組、一控制模組和一驅動模組。該些串聯模組中的相鄰串聯模組間通過各自的功率開關耦接，其中，至少一串聯模組具有一功率開關和一第一檢測單元。該功率開關具有一第一端、一第二端和一第三端，該第一端用於驅動該功率開關導通或關斷，該第二端耦接至相鄰的一串聯模組，該第三端耦接至相鄰的另一串聯模組。第一檢測單元藉由該功率開關串聯電路中di/dt的數值，輸出一檢測信號。比 較模組用以接收該檢測信號，並將該檢測信號與一預設閾值進行比較，當該檢測信號高於該預設閾值時，該比較模組輸出一短路信號。該控制模組電性連接至該比較模組，用以接收該短路信號並輸出與該短路信號相對應的一第一控制信號。該驅動模組電性連接至該控制模組，用以將該第一控制信號進行放大處理，以便驅動每一串聯模組中的功率開關執行關斷操作。 To achieve the above objective, one aspect of the present invention relates to a power switch series circuit including a plurality of series modules, a comparison module, a control module, and a driving module. The adjacent series modules of the series modules are coupled by respective power switches, wherein at least one series module has a power switch and a first detecting unit. The power switch has a first end, a second end, and a third end, wherein the first end is used to drive the power switch to be turned on or off, and the second end is coupled to an adjacent series module. The third end is coupled to another adjacent series module. The first detecting unit outputs a detection signal by the value of di/dt in the series circuit of the power switch. ratio The comparison module is configured to receive the detection signal, and compare the detection signal with a preset threshold. When the detection signal is higher than the preset threshold, the comparison module outputs a short circuit signal. The control module is electrically connected to the comparison module for receiving the short circuit signal and outputting a first control signal corresponding to the short circuit signal. The driving module is electrically connected to the control module for amplifying the first control signal to drive the power switch in each series module to perform a shutdown operation.
該第一檢測單元包括一電感元件。更優選地，該電感元件為該功率開關內部的一寄生電感。 The first detecting unit includes an inductive component. More preferably, the inductive component is a parasitic inductance inside the power switch.
在一實施例中，至少一串聯模組還包括一均壓電路，並且該均壓電路具有一電阻、一二極體和一電容，該電阻跨接於該功率開關的第二端和第三端之間，該二極體和該電容串聯連接後再跨接於該功率開關的第二端和第三端之間，其中，該二極體的陽極連接於該功率開關的第二端，以及該二極體的陰極與電容相連。 In one embodiment, the at least one series module further includes a voltage equalizing circuit, and the voltage equalizing circuit has a resistor, a diode, and a capacitor, the resistor is connected across the second end of the power switch and Between the third ends, the diode and the capacitor are connected in series and then connected between the second end and the third end of the power switch, wherein the anode of the diode is connected to the second of the power switch The terminal, and the cathode of the diode, are connected to the capacitor.
在另一實施例中，多個串聯模組的一串聯模組更包括一第二檢測模組，該第二檢測模組具有一檢測單元和一隔離單元，該檢測單元用以檢測該功率開關的第二端和第三端之間的電壓是否過壓，以及該隔離單元在過壓時輸出一過壓信號。 In another embodiment, a series module of the plurality of series modules further includes a second detecting module, the second detecting module has a detecting unit and an isolating unit, and the detecting unit is configured to detect the power switch Whether the voltage between the second end and the third end is overvoltage, and the isolation unit outputs an overvoltage signal when overvoltage.
功率開關串聯電路更包括一邏輯電路，具有多個輸入端和至少一輸出端，該些輸入端分別連接至該比較模組的輸出端以及該第二檢測模組的隔離單元，並且該輸出端用以輸出一第三控制信號。在一實施例 中，該邏輯電路為一或閘電路，當該功率開關串聯電路出現短路或過壓情形時，該第三控制信號為一高電位信號。在另一實施例中，該邏輯電路為一與閘電路，當該功率開關串聯電路出現短路或過壓情形時，該第三控制信號為一低電位信號。 The power switch series circuit further includes a logic circuit having a plurality of input ends and at least one output end, the input ends being respectively connected to an output end of the comparison module and an isolation unit of the second detection module, and the output end Used to output a third control signal. In an embodiment The logic circuit is an OR gate circuit. When the power switch series circuit is short-circuited or over-voltage, the third control signal is a high-potential signal. In another embodiment, the logic circuit is a gate circuit, and the third control signal is a low potential signal when the power switch series circuit is short-circuited or over-voltage.
該控制模組電性連接至該邏輯電路的輸出端，用以接收該第三控制信號，並輸出與該第三控制信號相對應的該第一控制信號至該驅動模組。 The control module is electrically connected to the output end of the logic circuit for receiving the third control signal, and outputs the first control signal corresponding to the third control signal to the driving module.
該第三控制信號經由光纖傳送至該控制模組。 The third control signal is transmitted to the control module via an optical fiber.
該比較模組為一比較器，用以將該檢測信號與該第一閾值電壓進行比較，並在該檢測信號高於該預設閾值時輸出一短路信號。 The comparison module is a comparator for comparing the detection signal with the first threshold voltage and outputting a short circuit signal when the detection signal is higher than the preset threshold.
該功率開關串聯電路更包括一軟關斷模組，具有一輸入端和一輸出端，該輸入端連接至該比較模組的輸出端，以及該輸出端連接至該功率開關的第一端，用以在該功率開關串聯電路出現短路時輸出一第二控制信號。當該功率開關串聯電路出現短路時，該第二控制信號先於該第一控制信號到達每一串聯模組的功率開關。 The power switch series circuit further includes a soft shutdown module having an input end and an output end, the input end being connected to the output end of the comparison module, and the output end being connected to the first end of the power switch, The utility model is configured to output a second control signal when a short circuit occurs in the power switch series circuit. When the power switch series circuit is short-circuited, the second control signal reaches the power switch of each series module prior to the first control signal.
該功率開關為絕緣閘雙極型電晶體。 The power switch is an insulated gate bipolar transistor.
本發明內容之一技術樣態係關於一種用以控制上述功率開關串聯電路的方法，該方法包括：讀取該第一檢測單元輸出的該檢測信號；將該檢測信號與一預設閾值進行比較；當該檢測信號高於該預設閾值時， 輸出一短路信號；以及根據該短路信號，將一控制信號經驅動放大後傳送至每一串聯模組的功率開關，使得每一串聯模組的功率開關執行關斷操作。 A technical aspect of the present invention relates to a method for controlling the power switch series circuit, the method comprising: reading the detection signal output by the first detecting unit; comparing the detection signal with a preset threshold When the detection signal is above the preset threshold, And outputting a short circuit signal; and transmitting a control signal to the power switch of each series module according to the short circuit signal, so that the power switch of each series module performs a shutdown operation.
該控制信號經由光纖傳送至所述驅動模組。 The control signal is transmitted to the drive module via an optical fiber.
該方法還包括：產生與該短路信號相對應的一第二控制信號；以及將該第二控制信號送至每一串聯模組的功率開關的第一端，其中，該第二控制信號先於該第一控制信號到達該功率開關的第一端。 The method further includes: generating a second control signal corresponding to the short circuit signal; and sending the second control signal to a first end of the power switch of each series module, wherein the second control signal precedes The first control signal reaches the first end of the power switch.
該功率開關為絕緣閘雙極型電晶體。 The power switch is an insulated gate bipolar transistor.
本發明內容之一技術樣態係關於一種多電平變換裝置，其中，該多電平變換裝置包括一三相H橋電路，該三相H橋電路包含複數個橋臂，該些橋臂中每一橋臂具有一第一子橋臂和一第二子橋臂，其中，該第一子橋臂和該第二子橋臂均由上述一個或多個功率開關串聯電路所構成。 A technical aspect of the present invention relates to a multilevel conversion apparatus, wherein the multilevel conversion apparatus includes a three-phase H-bridge circuit including a plurality of bridge arms, and the bridge arms are Each of the bridge arms has a first sub-bridge arm and a second sub-bridge arm, wherein the first sub-bridge arm and the second sub-bridge arm are each formed by the one or more power switch series circuits.
該三相H橋電路為兩電位H橋或三電位H橋。 The three-phase H-bridge circuit is a two-potential H-bridge or a three-potential H-bridge.
該第一子橋臂中的每一功率開關的第一端均用以接收一控制信號，以及該第二子橋臂中的每一功率開關的第一端均用以接收另一控制信號。 A first end of each of the first sub-bridge arms is configured to receive a control signal, and a first end of each of the second sub-bridge arms is configured to receive another control signal.
採用本發明的功率開關串聯電路，通過至少一串聯模組中的第一檢測單元，測量其兩端所載入的電壓來檢測di/dt的數值，並且當該di/dt數值超過預定值時輸出一短路信號，進而由控制模組輸出與該短路信號相對應的控制信號，以便關斷整個串聯橋臂上的 功率開關，以免功率開關因短路故障而遭到損壞，因而可提升該功率開關串聯電路的運行可靠性。此外，在對功率開關進行短路保護時，還可同時對每一串聯模組中的功率開關進行過壓保護，從而使功率開關串聯電路既具有短路保護功能，也具有過壓保護功能。此外，在檢測到電路中發生短路情形時，還可採用軟關斷技術先降低功率開關的控制電壓，以限制短路電流繼續上升，然後再由控制模組輸出控制信號至功率開關，以軟關斷該功率開關，減緩功率開關電流下降速度，避免產生電壓過沖，從而使功率開關具有更大的安全工作區裕量。 Using the power switch series circuit of the present invention, the voltage of the di/dt is detected by measuring the voltage loaded at both ends of the first detection unit in at least one series module, and when the di/dt value exceeds a predetermined value Outputting a short circuit signal, and then the control module outputs a control signal corresponding to the short circuit signal to turn off the entire series bridge arm The power switch prevents the power switch from being damaged due to a short circuit fault, thereby improving the operational reliability of the power switch series circuit. In addition, when the power switch is short-circuit protected, the power switch in each series module can be over-voltage protected at the same time, so that the power switch series circuit has both short-circuit protection function and over-voltage protection function. In addition, when a short circuit condition occurs in the circuit, the soft turn-off technique can be used to first reduce the control voltage of the power switch to limit the short circuit current to continue to rise, and then the control module outputs a control signal to the power switch to soften Breaking the power switch slows down the power switch current drop speed and avoids voltage overshoot, which makes the power switch have a larger safe working area margin.
下面參照附圖，對本發明的具體實施方式作進一步的詳細描述。 Specific embodiments of the present invention will be further described in detail below with reference to the drawings.
為了使本揭示內容之敘述更加詳盡與完備，可參照所附之圖式及以下該各種實施例，圖式中相同之號碼代表相同或相似之元件。但所提供之實施例並非用以限制本發明所涵蓋的範圍，而結構運作之描述非用以限制其執行之順序，任何由元件重新組合之結構，所產生具有均等功效的裝置，皆為本發明所涵蓋的範圍。 In order to make the description of the present disclosure more complete and complete, reference is made to the accompanying drawings and the accompanying drawings. However, the embodiments provided are not intended to limit the scope of the invention, and the description of the operation of the structure is not intended to limit the order of its execution, and any device that is recombined by the components produces equal devices. The scope covered by the invention.
其中圖式僅以說明為目的，並未依照原尺寸作圖。另一方面，眾所週知的元件與步驟並未描述於實施例中，以避免對本發明造成不必要的限制。 The drawings are for illustrative purposes only and are not drawn to the original dimensions. On the other hand, well-known elements and steps are not described in the embodiments to avoid unnecessarily limiting the invention.
第1圖繪示依據本發明一實施方式的功率開關串聯電路的電路方塊示意圖。請參照第1圖，該功率開關串聯電路包括串聯模組10和20、一比較模組30、一控制模組40和一驅動模組50。具體地，相鄰的串聯模組10和20通過各自的功率開關101和201耦接。串聯模組10包括功率開關101和第一檢測單元103，功率開關101的第一端用以接收驅動信號而使得功率開關101據以導通或關斷，功率開關101的第二端耦接至相鄰的一串聯模組，以及功率開關101的第三端耦接至相鄰的另一串聯模組。 FIG. 1 is a circuit block diagram of a power switch series circuit according to an embodiment of the invention. Referring to FIG. 1 , the power switch series circuit includes series modules 10 and 20 , a comparison module 30 , a control module 40 , and a driving module 50 . Specifically, adjacent series modules 10 and 20 are coupled by respective power switches 101 and 201. The series module 10 includes a power switch 101 and a first detecting unit 103. The first end of the power switch 101 is configured to receive a driving signal such that the power switch 101 is turned on or off, and the second end of the power switch 101 is coupled to the phase. A series of adjacent modules, and a third end of the power switch 101 are coupled to another adjacent series module.
第一檢測單元103檢測功率開關串聯電路的電流變化率di/dt的數值，並輸出一檢測信號。在一實施例中，該第一檢測單元103包括一電感元件，串聯連接於串聯模組10的功率開關101和串聯模組20的功率開關201之間，並且該第一檢測單元103輸出的該檢測信號送至比較模組30，其中，載入於電感元件兩端的電壓信號等於Ls×di/dt(Ls為電感元件之電感值)，因而該電壓信號也可線性地反映di/dt的數值變化。在另一實施例中，該第一檢測單元103為功率開關101內部的一寄生電感，通過檢測載入於該寄生電感上的電壓也可反映di/dt的數值，進而判斷該功率開關串聯 電路是否出現短路情形。優選地，該功率開關採用相同型號的絕緣閘雙極型電晶體(IGBT，Insulated Gate Bipolar Transistor)。 The first detecting unit 103 detects the value of the current change rate di/dt of the power switch series circuit, and outputs a detection signal. In an embodiment, the first detecting unit 103 includes an inductive component connected in series between the power switch 101 of the series module 10 and the power switch 201 of the series module 20, and the first detecting unit 103 outputs the The detection signal is sent to the comparison module 30, wherein the voltage signal loaded across the inductance element is equal to Ls×di/dt (Ls is the inductance value of the inductance element), and thus the voltage signal can also linearly reflect the value of di/dt. Variety. In another embodiment, the first detecting unit 103 is a parasitic inductance inside the power switch 101, and the value of the di/dt can also be reflected by detecting the voltage loaded on the parasitic inductance, thereby determining that the power switch is connected in series. Whether the circuit has a short circuit condition. Preferably, the power switch uses the same type of insulated gate bipolar transistor (IGBT).
比較模組30電性連接至第一檢測單元103，用以接收來自該第一檢測單元103所輸出的檢測信號，並將該檢測信號與一預設閾值(threshold)(如短路保護閾值電壓)進行比較，當該檢測信號大於預設閾值時，比較模組30輸出一短路信號。較佳地，該比較模組30可為一比較器。例如，該比較器採用一運算放大器構成，其中，來自第一檢測單元103的檢測信號耦接至運算放大器的第一端，預設閾值耦接至運算放大器的第二端，以便將該檢測信號與該預設閾值進行比較，並且在所述檢測信號超出該預設閾值時，從該運算放大器的輸出端輸出該短路信號。 The comparison module 30 is electrically connected to the first detecting unit 103 for receiving the detection signal outputted by the first detecting unit 103, and the detection signal is combined with a predetermined threshold (such as a short-circuit protection threshold voltage). For comparison, when the detection signal is greater than a preset threshold, the comparison module 30 outputs a short circuit signal. Preferably, the comparison module 30 can be a comparator. For example, the comparator is configured by an operational amplifier, wherein the detection signal from the first detecting unit 103 is coupled to the first end of the operational amplifier, and the preset threshold is coupled to the second end of the operational amplifier to detect the detection signal. Comparing with the preset threshold, and outputting the short circuit signal from the output of the operational amplifier when the detection signal exceeds the preset threshold.
控制模組40電性連接至比較模組30和驅動模組50，該控制模組40接收來自比較模組30所輸出的短路信號，並輸出與該短路信號相對應的一第一控制信號，然後，該第一控制信號被送入驅動模組50進行放大處理，並將放大處理後的驅動信號送至功率開關101和功率開關201各自的第一端，以驅動它們執行關斷操作。在一具體實施例中，控制模組40還可將正常驅動功率開關101和功率開關201的控制信號與比較模組30所輸出的信號進行邏輯運算，例如，當第一檢測單元103輸出的電壓信號高於短路保護閾值電壓時， 透過比較模組30輸出的短路信號能夠遮罩該正常驅動信號，進而控制模組40輸出與該短路信號相對應的控制信號，以便同步關斷功率開關串聯電路中的功率開關101和功率開關201；當第一檢測單元103輸出的電壓信號低於短路保護閾值電壓時，功率開關串聯電路中未出現短路情形，此時，比較模組30輸出的比較信號無法遮罩該正常驅動信號，從而控制模組40仍然能夠輸出該正常驅動信號，使該功率開關串聯電路中的功率開關101和功率開關201繼續保持正常運行狀態。 The control module 40 is electrically connected to the comparison module 30 and the driving module 50. The control module 40 receives the short circuit signal output from the comparison module 30, and outputs a first control signal corresponding to the short circuit signal. Then, the first control signal is sent to the driving module 50 for amplification processing, and the amplified driving signal is sent to the first ends of the power switch 101 and the power switch 201 to drive them to perform a shutdown operation. In a specific embodiment, the control module 40 can also perform logic operations on the control signals of the normal driving power switch 101 and the power switch 201 and the signals output by the comparison module 30, for example, when the voltage output by the first detecting unit 103 is output. When the signal is above the short-circuit protection threshold voltage, The normal driving signal can be masked by the short circuit signal outputted by the comparison module 30, and the control module 40 outputs a control signal corresponding to the short circuit signal to synchronously turn off the power switch 101 and the power switch 201 in the power switch series circuit. When the voltage signal output by the first detecting unit 103 is lower than the short-circuit protection threshold voltage, no short-circuit condition occurs in the power switch series circuit. At this time, the comparison signal output by the comparison module 30 cannot cover the normal driving signal, thereby controlling The module 40 can still output the normal driving signal, so that the power switch 101 and the power switch 201 in the series circuit of the power switch continue to maintain a normal operating state.
本領域的技術人員應當理解，第1圖中的功率開關串聯電路包括串聯模組10和串聯模組20，但本發明並不只局限於僅僅包括兩個串聯模組。例如，在其他實施例中，本發明的功率開關串聯電路還可包括三個串聯模組或三個以上串聯模組的情形，而這些實施例也同樣包含在本發明的精神範圍內。 It will be understood by those skilled in the art that the power switch series circuit of FIG. 1 includes the series module 10 and the series module 20, but the present invention is not limited to only including two series modules. For example, in other embodiments, the power switch series circuit of the present invention may further include three series modules or three or more series modules, and these embodiments are also included in the spirit of the present invention.
第2圖繪示第1圖中的功率開關串聯電路的第一優選實施例的電路結構示意圖。相比於第1圖，第2圖的功率開關串聯電路更包括一軟關斷模組60，具有一輸入端和一輸出端，其輸入端電性連接至比較模組30的輸出端，用以接收來自第一檢測單元103的檢測信號與預設閾值之間進行比較後的比較信號(如，該檢測信號超出預設閾值時，比較模組30輸出一短路信號)，其輸出端連接至串聯模組10中的功率開關101 的第一端和串聯模組20中的功率開關201的第一端，用以在發生短路情形時根據所接收的短路信號來輸出第二控制信號，從而降低功率開關101和201第一端的控制電壓並進行軟關斷操作。亦即，當該功率開關串聯電路出現短路情形時，第一檢測單元103所輸出的檢測信號將會高於預設閾值，因而比較模組30會輸出一短路信號，進而該軟關斷模組60將與該短路信號相對應的第二控制信號分別發送至功率開關101和201的第一端，以便限制流經功率開關101和201的短路電流繼續上升。較佳地，當功率開關串聯電路出現短路情形時，由軟關斷模組60輸出的第二控制信號先於控制模組40輸出的第一控制信號到達功率開關101和201的第一端。 FIG. 2 is a schematic diagram showing the circuit structure of the first preferred embodiment of the power switch series circuit in FIG. 1. Compared with FIG. 1 , the power switch series circuit of FIG. 2 further includes a soft shutdown module 60 having an input end and an output end, the input end of which is electrically connected to the output end of the comparison module 30. Receiving a comparison signal between the detection signal from the first detecting unit 103 and a preset threshold (for example, when the detection signal exceeds a preset threshold, the comparison module 30 outputs a short circuit signal), and the output end thereof is connected to Power switch 101 in series module 10 The first end and the first end of the power switch 201 in the series module 20 are configured to output a second control signal according to the received short circuit signal when a short circuit condition occurs, thereby reducing the first ends of the power switches 101 and 201 Control the voltage and perform a soft shutdown. That is, when the power switch series circuit is short-circuited, the detection signal output by the first detecting unit 103 will be higher than a preset threshold, and thus the comparison module 30 outputs a short-circuit signal, and the soft-shutdown module A second control signal corresponding to the short circuit signal is sent to the first ends of the power switches 101 and 201, respectively, to limit the short circuit current flowing through the power switches 101 and 201 to continue to rise. Preferably, when a short circuit condition occurs in the power switch series circuit, the second control signal output by the soft shutdown module 60 reaches the first end of the power switches 101 and 201 prior to the first control signal output by the control module 40.
由上述可知，採用第2圖的軟關斷模組60，在對功率開關串聯電路進行短路保護的同時，利用軟關斷模組60輸出的第二控制信號，可先行限制流經功率開關101和201的短路電流繼續增加。與此同時，採用第一檢測單元103，能夠快速的檢測出功率開關串聯電路中的短路故障，並結合軟關斷功能，以便快速地限制短路電流繼續增加，再由控制模組40輸出控制信號至功率開關101和201的第一端時，其對應的控制電壓逐漸下降，從而軟關斷該功率開關101和201，減緩了功率開關電流的下降速度，有效地減少功率開 關串聯電路中的寄生電感所帶來的關斷電壓尖峰，使功率開關具有更大的安全工作區裕量。 It can be seen from the above that the soft-shutdown module 60 of FIG. 2 can be used to limit the flow of the power switch 101 by using the second control signal outputted by the soft-shutdown module 60 while short-circuiting the power switch series circuit. The short-circuit current of 201 and 201 continues to increase. At the same time, the first detecting unit 103 can quickly detect the short circuit fault in the power switch series circuit, and combine the soft turn-off function to quickly limit the short circuit current to continue to increase, and then the control module 40 outputs the control signal. When the first ends of the power switches 101 and 201 are turned, the corresponding control voltages are gradually decreased, thereby softly turning off the power switches 101 and 201, slowing down the speed of the power switch current, and effectively reducing the power on. Turning off the voltage spikes caused by parasitic inductance in the series circuit allows the power switch to have a larger safe working area margin.
第3圖繪示第1圖中的功率開關串聯電路的第二優選實施例的電路結構示意圖。第4A圖繪示第3圖中的串聯模組10的均壓電路105的電路示意圖；以及第4B圖繪示第3圖中的串聯模組10的第二檢測模組107的電路示意圖。參照第3圖、第4A圖和第4B圖，本發明的功率開關串聯電路在實現短路檢測和保護的同時，還可分別對每一串聯模組中的功率開關進行過壓檢測和保護。例如，功率開關串聯電路通過串聯模組10中的第二檢測單元107可對串聯橋臂上的功率開關101和201進行過壓檢測和保護。較佳地，本發明的功率開關串聯電路還可在每一串聯模組中設置第二檢測單元107，以便透過任意一個串聯模組中的第二檢測單元107就可以對串聯橋臂上的所有功率開關進行過壓檢測和保護。 FIG. 3 is a schematic diagram showing the circuit structure of a second preferred embodiment of the power switch series circuit of FIG. 1. 4A is a circuit diagram of the voltage equalization circuit 105 of the series module 10 in FIG. 3; and FIG. 4B is a circuit diagram of the second detection module 107 of the series module 10 in FIG. Referring to FIG. 3, FIG. 4A and FIG. 4B, the power switch series circuit of the present invention can perform overvoltage detection and protection on the power switches in each series module while realizing short circuit detection and protection. For example, the power switch series circuit can overvoltage detect and protect the power switches 101 and 201 on the series bridge arm through the second detection unit 107 in the series module 10. Preferably, the power switch series circuit of the present invention can also provide a second detecting unit 107 in each series module, so that all of the series bridge arms can be transmitted through the second detecting unit 107 of any one of the series modules. The power switch performs overvoltage detection and protection.
參照第4A圖，串聯模組10中的均壓電路105包括一電阻R1、一二極體D1和一電容C1。其中，電阻R1跨接於功率開關101的第二端和第三端之間，二極體D1和電容C1串聯連接後再跨接於功率開關101的第二端和第三端，並且二極體D1的陽極連接於功率開關101的第二端，二極體D1的陰極與電容C1的一端相連，電容C1的另一端與功率開關101的第三端相連。其中，該電阻R1用來對功率開關101進行靜 態均壓，以及該二極體D1和電容C1用來對功率開關101進行動態均壓。需要指出的是，串聯電路中的功率器件因阻斷特性不一致，從而造成該功率器件靜態不均壓；而串聯電路中的功率器件因開關特性不一致，從而會造成動態不均壓。為此，在串聯橋臂上的每一功率開關的第二端和第三端之間並聯電阻值相等的電阻，能夠有效地實現靜態均壓。另外，依據電容兩端所載入的電壓不能突變的特性，可對功率開關的動態均壓進行顯著地改進。 Referring to FIG. 4A, the voltage equalization circuit 105 in the series module 10 includes a resistor R1, a diode D1, and a capacitor C1. The resistor R1 is connected between the second end and the third end of the power switch 101, and the diode D1 and the capacitor C1 are connected in series and then connected to the second end and the third end of the power switch 101, and the diode The anode of the body D1 is connected to the second end of the power switch 101, the cathode of the diode D1 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is connected to the third end of the power switch 101. Wherein, the resistor R1 is used to statically switch the power switch 101. The state equalization, and the diode D1 and the capacitor C1 are used to dynamically equalize the power switch 101. It should be pointed out that the power devices in the series circuit are inconsistent due to the blocking characteristics, resulting in static uneven voltage of the power device; and the power devices in the series circuit are inconsistent due to the switching characteristics, thereby causing dynamic uneven voltage. For this reason, a resistor having the same resistance value is connected in parallel between the second end and the third end of each power switch on the series bridge arm, so that static voltage equalization can be effectively realized. In addition, the dynamic voltage equalization of the power switch can be significantly improved depending on the characteristics that the voltage applied across the capacitor cannot be abruptly changed.
參照第4B圖，串聯模組10中的第二檢測單元107包括一檢測單元1071和一隔離單元1072。其中，檢測單元1071用以檢測反映功率開關101的第二端和第三端之間的電壓是否過壓，例如，上述反映功率開關101的第二端和第三端間的電壓可以透過檢測電容C1兩端的電壓予以實現，以及隔離單元1072根據所檢測的電壓輸出一檢測信號。較佳地，該檢測單元1071為一TVS(Transient Voltage Suppressor，瞬態電壓抑制器)二極體或一穩壓管，用以檢測該功率開關101的第二端和第三端之間的電壓是否過壓。較佳地，該隔離單元1072可為一高速光耦合器，以便隔離檢測單元1071所檢測的電壓信號以及隔離單元1072輸出的電壓檢測信號，同時，該高速光耦合器還可快速地將過壓時的電壓檢測信號傳送至邏輯電路70。例如，高速光耦合器包括一發光半導體和一受光半導體，其中， 該發光半導體與檢測單元1071串聯連接，以及該受光半導體連接至控制模組40。例如，在第4B圖中，該發光半導體為一發光二極體，該受光半導體為一電晶體。 Referring to FIG. 4B, the second detecting unit 107 in the series module 10 includes a detecting unit 1071 and an isolation unit 1072. The detecting unit 1071 is configured to detect whether the voltage between the second end and the third end of the power switch 101 is overvoltage. For example, the voltage between the second end and the third end of the power switch 101 can be transmitted through the detecting capacitor. The voltage across C1 is implemented, and isolation unit 1072 outputs a detection signal based on the detected voltage. Preferably, the detecting unit 1071 is a TVS (Transient Voltage Suppressor) diode or a Zener diode for detecting the voltage between the second end and the third end of the power switch 101. Is it over pressure? Preferably, the isolation unit 1072 can be a high speed optical coupler to isolate the voltage signal detected by the detecting unit 1071 and the voltage detection signal output by the isolation unit 1072, and the high speed optical coupler can quickly overvoltage. The voltage detection signal at the time is transmitted to the logic circuit 70. For example, the high speed optical coupler includes a light emitting semiconductor and a light receiving semiconductor, wherein The light emitting semiconductor is connected in series with the detecting unit 1071, and the light receiving semiconductor is connected to the control module 40. For example, in FIG. 4B, the light emitting semiconductor is a light emitting diode, and the light receiving semiconductor is a transistor.
在另一實施例中，功率開關串聯電路的邏輯電路70具有多個輸入端和至少一輸出端，其中，一輸入端電性連接至串聯模組10的第二檢測單元107的輸出端，另一輸入端電性連接至比較模組30的輸出端，以及邏輯電路70的輸出端根據來自串聯模組10的第二檢測單元107的電壓檢測信號以及比較模組30輸出的比較信號來輸出一第三控制信號。例如，該邏輯電路為一或閘(OR gate)電路，當功率開關串聯電路出現短路(如短路信號為一高電平)或過壓(如過壓信號為一高電平)時，邏輯電路70輸出的該第三控制信號為高電平信號。又如，該邏輯電路為一與閘(AND gate)電路，當功率開關串聯電路出現短路(如短路信號為一低電平)或過壓(如過壓信號為一低電平)時，邏輯電路70輸出的該第三控制信號為低電平信號。 In another embodiment, the logic circuit 70 of the power switch series circuit has a plurality of inputs and at least one output, wherein one input is electrically connected to the output of the second detecting unit 107 of the series module 10, and An input terminal is electrically connected to the output end of the comparison module 30, and an output end of the logic circuit 70 outputs a voltage detection signal from the second detection unit 107 of the series module 10 and a comparison signal output by the comparison module 30. The third control signal. For example, the logic circuit is an OR gate circuit, when a short circuit of the power switch series circuit (such as a short circuit signal is a high level) or an over voltage (such as an over voltage signal is a high level), the logic circuit The third control signal outputted by 70 is a high level signal. For another example, the logic circuit is an AND gate circuit, when a short circuit of the power switch series circuit (such as a short circuit signal is a low level) or an over voltage (such as an over voltage signal is a low level), logic The third control signal output by circuit 70 is a low level signal.
控制模組40電性連接至邏輯電路70和驅動模組50，以接收來自該邏輯電路70的該第三控制信號，並輸出與該第三控制信號相對應的第一控制信號，經由驅動模組50驅動放大後，送至每一串聯模組10和20各自的功率開關101和201的第一端。同樣，控制模組40還可將用以功率開關101和功率開關201的正常 驅動信號與邏輯電路70輸出的第三控制信號進行邏輯運算，例如，當第三控制信號表示功率開關串聯電路出現短路或者過壓情形時，邏輯電路70輸出的該第三控制信號能夠遮罩該正常驅動信號，從而控制模組40輸出與該短路信號或過壓信號相對應的第一控制信號，經由驅動模組50放大後送至每一串聯模組10和20各自的功率開關101和201的第一端，以同步關斷功率開關101和201；而當第三控制信號表示功率開關串聯電路既無短路情形又無過壓情形發生時，則邏輯電路70輸出的第三控制信號無法遮罩該正常驅動信號，因而控制模組40仍然輸出該信號以使得功率開關101和201繼續保持正常運行狀態。優選地，來自邏輯電路70的第三控制信號經由光纖傳送至控制模組40。 The control module 40 is electrically connected to the logic circuit 70 and the driving module 50 to receive the third control signal from the logic circuit 70, and output a first control signal corresponding to the third control signal, via the driving mode. The group 50 is driven and amplified and sent to the first ends of the respective power switches 101 and 201 of each of the series modules 10 and 20. Similarly, the control module 40 can also be used for the power switch 101 and the power switch 201. The driving signal is logically operated with the third control signal output by the logic circuit 70. For example, when the third control signal indicates a short circuit or an overvoltage condition of the power switch series circuit, the third control signal output by the logic circuit 70 can mask the Normally driving the signal, so that the control module 40 outputs a first control signal corresponding to the short circuit signal or the overvoltage signal, and is amplified by the driving module 50 and sent to the respective power switches 101 and 201 of each of the series modules 10 and 20. The first end of the power switch 101 and 201 are synchronously turned off; and when the third control signal indicates that the power switch series circuit has neither a short circuit condition nor an overvoltage condition, the third control signal output by the logic circuit 70 cannot be covered. The normal drive signal is masked so that the control module 40 still outputs the signal to cause the power switches 101 and 201 to remain in a normal operating state. Preferably, the third control signal from logic circuit 70 is transmitted to control module 40 via the optical fiber.
第5A圖和第5B圖繪示第1圖中的串聯模組的功率開關在關斷時其控制電壓波形和流經功率開關的短路電流波形。第6A圖和第6B圖繪示第2圖的串聯模組的功率開關在施加了軟關斷操作時其控制電壓波形和流經功率開關的短路電流波形。 5A and 5B illustrate the control voltage waveform and the short-circuit current waveform flowing through the power switch when the power switch of the series module in FIG. 1 is turned off. 6A and 6B are diagrams showing the control voltage waveform and the short-circuit current waveform flowing through the power switch when the power switch of the series module of FIG. 2 is applied with a soft-off operation.
參照第5A圖和第5B圖，不妨預設功率開關當前的控制電壓為V GE ，該功率開關導通時的閾值電壓為V GE(th) ，在時刻t0時，電路中的電流I bus 達到峰值，控制電壓從V GE 逐漸下降，然後執行功率開關的一般關斷過程。 Referring to FIG. 5A and FIG. 5B, it may be preset that the current control voltage of the power switch is V GE , and the threshold voltage when the power switch is turned on is V GE(th) . At time t0, the current I bus in the circuit reaches a peak value. The control voltage is gradually decreased from V GE and then the general turn-off process of the power switch is performed.
不同於第5A圖和第5B圖，第6A圖和第6B圖繪示引入了軟關斷操作時的控制電壓波形和流經功率開關的短路電流波形。從第6A圖和第6B圖中可知，當功率開關串聯電路在t0時刻出現短路情形時，軟關斷電路開始輸出與短路信號相對應的一第二控制信號至功率開關的第一端，由於信號傳遞的時間延遲，直到t1時刻該控制電壓才從V GE 降至V T ，並且從t0時刻到t1時刻，流經功率開關的短路電流繼續上升。然後，從t1時刻到t2時刻功率開關的控制電壓保持V T 不變，因為功率開關的控制電壓V T 使飽和電流值降低，流經功率開關的短路電流不再上升，被限定於其控制電壓V T 狀態時對應的飽和電流值。接著，從t2時刻開始，控制電壓緩慢下降，進而軟關斷該功率開關。 Unlike FIGS. 5A and 5B, FIGS. 6A and 6B illustrate the control voltage waveform and the short-circuit current waveform flowing through the power switch when the soft-shutdown operation is introduced. It can be seen from FIG. 6A and FIG. 6B that when the power switch series circuit is short-circuited at time t0, the soft-shutdown circuit starts outputting a second control signal corresponding to the short-circuit signal to the first end of the power switch, The time delay of signal transmission is not reduced from V GE to V T until time t1 , and the short-circuit current flowing through the power switch continues to rise from time t0 to time t1. Then, the control voltage of the power switch keeps V T from the time t1 to the time t2, because the control voltage V T of the power switch lowers the saturation current value, and the short-circuit current flowing through the power switch no longer rises, and is limited to its control voltage. Corresponding saturation current value in the V T state. Then, starting from time t2, the control voltage is slowly lowered, and the power switch is softly turned off.
將第5B圖和第6B圖對比，不難看出，採用軟關斷技術，當功率開關串聯電路發生短路時，經過t1~t2的限流區間和t2~t3的軟關斷區間，流經功率開關的短路電流波形不再上升，因而可有效地抑制關斷時的尖峰電流，並且在軟關斷期間，流經功率開關的電流緩慢下降從而可有效地減少功率開關串聯電路中的寄生電感所帶來的關斷電壓尖峰，進而提高了功率開關安全工作區的裕量。 Comparing Figure 5B with Figure 6B, it is easy to see that with the soft-shutdown technique, when the power switch series circuit is short-circuited, the current-limiting interval of t1~t2 and the soft-off interval of t2~t3, the power flowing through The short-circuit current waveform of the switch no longer rises, so the peak current during turn-off can be effectively suppressed, and during the soft-off period, the current flowing through the power switch is slowly decreased, thereby effectively reducing the parasitic inductance in the power switch series circuit. The shutdown voltage spikes are added, which in turn increases the margin of the power switch safe working area.
第7圖繪示依據本發明的另一實施方式的功率開關串聯電路的控制方法的流程示意圖。該方法首先執 行步驟S701，讀取第一檢測單元所輸出的檢測信號，例如，該第一檢測單元包括一電感元件，讀取載入於該電感元件兩端的電壓信號，即，Ls×di/dt，以快速地反映di/dt的數值變化從而檢測功率開關串聯電路是否出現短路情形。接著，執行步驟S703和S705，將第一檢測單元所輸出的檢測信號與所述預設閾值進行比較，當該檢測信號高於該預設閾值時，表明該功率開關串聯電路出現短路情形，輸出一短路信號；而當該檢測信號低於該預設閾值時，表明該功率開關串聯電路未發生短路。然後，執行步驟S707，根據該短路信號，將一控制信號經驅動放大後傳送至每一串聯模組的功率開關，以執行關斷操作。例如，該控制信號經由光纖傳送至驅動模組，經放大處理後達到每一串聯模組的功率開關。 FIG. 7 is a schematic flow chart showing a control method of a power switch series circuit according to another embodiment of the present invention. The method first performs step S701 to read the detection signal output by the first detecting unit. For example, the first detecting unit includes an inductive component, and reads a voltage signal loaded at both ends of the inductive component, that is, L s ×di /dt, to quickly reflect the change in the value of di / dt to detect whether the power switch series circuit is short-circuited. Then, steps S703 and S705 are performed to compare the detection signal output by the first detecting unit with the preset threshold. When the detection signal is higher than the preset threshold, it indicates that the power switch series circuit has a short circuit condition, and the output is a short circuit signal; and when the detection signal is lower than the preset threshold, indicating that the power switch series circuit does not short circuit. Then, step S707 is executed, according to the short circuit signal, a control signal is driven and amplified and then transmitted to the power switch of each series module to perform a shutdown operation. For example, the control signal is transmitted to the driving module via the optical fiber, and the power switch of each series module is obtained after being amplified.
在一具體實施例中，該方法還包括步驟：產生與所述短路信號相對應的一第二控制信號；以及將所述第二控制信號傳送至每一串聯模組的功率開關的第一端，其中，所述第二控制信號先於所述第一控制信號到達所述功率開關的第一端。 In a specific embodiment, the method further includes the steps of: generating a second control signal corresponding to the short circuit signal; and transmitting the second control signal to the first end of the power switch of each series module The second control signal reaches the first end of the power switch prior to the first control signal.
第8圖繪示將本發明的功率開關串聯電路應用以多電平變換裝置的原理示意圖。參照第8圖，該變換裝置包括一H橋電路，其中，該H橋電路具有三個橋臂，每一橋臂分為上橋臂和下橋臂。以第一橋臂81為例，該第一橋臂81包括上橋臂811和下橋臂812，其 中，該上橋臂811採用本發明的前述功率開關串聯電路構成，以等效於單個的一高壓半導體器件，以及該下橋臂812亦採用本發明的前述功率開關串聯電路構成，以等效於單個的另一高壓半導體器件。當H橋電路與三相電機電性連接時，該H橋電路的三個橋臂各自的輸出端電性連接至電機的對應相。 FIG. 8 is a schematic diagram showing the principle of applying the power switch series circuit of the present invention to a multilevel conversion device. Referring to Fig. 8, the transforming device includes an H-bridge circuit, wherein the H-bridge circuit has three bridge arms, each of which is divided into an upper arm and a lower arm. Taking the first bridge arm 81 as an example, the first bridge arm 81 includes an upper bridge arm 811 and a lower bridge arm 812, which The upper arm 811 is constructed by using the foregoing power switch series circuit of the present invention to be equivalent to a single high voltage semiconductor device, and the lower arm 812 is also constructed by using the foregoing power switch series circuit of the present invention to be equivalent. In a single other high voltage semiconductor device. When the H-bridge circuit is electrically connected to the three-phase motor, the respective output ends of the three bridge arms of the H-bridge circuit are electrically connected to the corresponding phases of the motor.
在一實施例中，當第一橋臂81的上橋臂811處於工作狀態，而下橋臂812處於空閒狀態時，通過本發明前述的功率開關串聯電路中的第一檢測單元輸出一檢測信號，進而可快速地檢測該第一橋臂81是否出現短路情形。類似地，當第一橋臂81的下橋臂812處於工作狀態，而上橋臂811處於空閒狀態時，也可以通過本發明前述的功率開關串聯電路中的第一檢測單元輸出一檢測信號，進而可快速地檢測該第一橋臂81是否出現短路情形。 In an embodiment, when the upper arm 811 of the first bridge arm 81 is in the working state and the lower arm 812 is in the idle state, the first detecting unit in the power switch series circuit of the present invention outputs a detection signal. In turn, it is possible to quickly detect whether the first bridge arm 81 has a short circuit condition. Similarly, when the lower arm 812 of the first bridge arm 81 is in the working state and the upper arm 811 is in the idle state, the first detecting unit in the power switch series circuit of the present invention can also output a detection signal. Further, it is possible to quickly detect whether or not the first bridge arm 81 has a short circuit condition.
本領域的技術人員應當理解，對於同一橋臂來說，上橋臂811或下橋臂812還可包括兩個或兩個以上的功率開關串聯電路，這些功率開關串聯電路採用串聯連接。也就是說，上橋臂811或下橋臂812可至少包括串聯連接的一等效高壓半導體器件以及另一等效高壓半導體器件，並且這兩個等效的高壓半導體器件分別採用本發明前述的功率開關串聯電路予以實現。 Those skilled in the art will appreciate that for the same bridge arm, the upper bridge arm 811 or the lower bridge arm 812 may also include two or more power switch series circuits that are connected in series. That is, the upper arm 811 or the lower arm 812 may include at least one equivalent high voltage semiconductor device and another equivalent high voltage semiconductor device connected in series, and the two equivalent high voltage semiconductor devices respectively adopt the aforementioned The power switch series circuit is implemented.
採用本發明的功率開關串聯電路，通過至少一串 聯模組中的第一檢測單元，測量其兩端所載入的電壓來檢測di/dt的數值，並且當該di/dt數值超過預定值時輸出一短路信號，進而由控制模組輸出與該短路信號相對應的控制信號，以便關斷整個串聯橋臂上的功率開關，以免功率開關因短路故障而遭到損壞，因而可提升該功率開關串聯電路的運行可靠性。此外，在對功率開關進行短路保護時，還可同時對每一串聯模組中的功率開關進行過壓保護，從而使功率開關串聯電路既具有短路保護功能，也具有過壓保護功能。此外，在檢測到電路中發生短路情形時，還可採用軟關斷技術先降低功率開關的控制電壓，以限制短路電流繼續上升，然後再由控制模組輸出控制信號至功率開關，以軟關斷該功率開關，減緩功率開關電流的下降速度，從而可有效地減少功率開關串聯電路中的寄生電感所帶來的關斷電壓尖峰，使功率開關具有更大的安全工作區裕量。 Using the power switch series circuit of the present invention, through at least one string The first detecting unit in the joint module measures the voltage loaded at both ends to detect the di/dt value, and outputs a short circuit signal when the di/dt value exceeds a predetermined value, and then is outputted by the control module The short-circuit signal corresponds to the control signal to turn off the power switch on the entire series bridge arm, so as to prevent the power switch from being damaged due to the short-circuit fault, thereby improving the operational reliability of the power switch series circuit. In addition, when the power switch is short-circuit protected, the power switch in each series module can be over-voltage protected at the same time, so that the power switch series circuit has both short-circuit protection function and over-voltage protection function. In addition, when a short circuit condition occurs in the circuit, the soft turn-off technique can be used to first reduce the control voltage of the power switch to limit the short circuit current to continue to rise, and then the control module outputs a control signal to the power switch to soften Breaking the power switch slows down the speed of the power switch current, thereby effectively reducing the turn-off voltage spike caused by the parasitic inductance in the power switch series circuit, and making the power switch have a larger safe working area margin.
雖然本發明已以實施方式揭露如上，然其並非用以限定本發明，任何熟習此技藝者，在不脫離本發明之精神和範圍內，當可作各種之更動與潤飾，因此本發明之保護範圍當視後附之申請專利範圍所界定者為準。 Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and the present invention can be modified and modified without departing from the spirit and scope of the present invention. The scope is subject to the definition of the scope of the patent application attached.
10、20‧‧‧串聯模組 10, 20‧‧‧ series module
107‧‧‧第二檢測模組 107‧‧‧Second test module
30‧‧‧比較模組 30‧‧‧Comparative Module
40‧‧‧控制模組 40‧‧‧Control Module
50‧‧‧驅動模組 50‧‧‧Drive Module
101、201‧‧‧功率開關 101, 201‧‧‧ power switch
103‧‧‧第一檢測單元 103‧‧‧First detection unit
105‧‧‧均壓電路 105‧‧‧equal voltage circuit
60‧‧‧軟關斷模組 60‧‧‧Soft Shutdown Module
70‧‧‧邏輯電路 70‧‧‧Logical Circuit
t0~t3‧‧‧時刻 T0~t3‧‧‧ moment
81‧‧‧第一橋臂 81‧‧‧First bridge arm
812‧‧‧下橋臂 812‧‧‧ lower arm
1071‧‧‧檢測單元 1071‧‧‧Detection unit
1072‧‧‧隔離單元 1072‧‧‧Isolation unit
R1‧‧‧電阻 R1‧‧‧ resistance
C1‧‧‧電容 C1‧‧‧ capacitor
D1‧‧‧二極體 D1‧‧‧ diode
S701~S707‧‧‧步驟 S701~S707‧‧‧Steps
V GE 、V T ‧‧‧控制電壓 V GE , V T ‧‧‧ control voltage
V GE(th) ‧‧‧閾值電壓 V GE(th) ‧‧‧ threshold voltage
I bus ‧‧‧電流 I bus ‧‧‧current
811‧‧‧上橋臂 811‧‧‧Upper arm
讀者在參照附圖閱讀了本發明的具體實施方式以 後，將會更清楚地瞭解本發明的各個方面。其中，第1圖繪示依據本發明一實施方式的功率開關串聯電路的原理示意圖；第2圖繪示第1圖中的功率開關串聯電路的第一優選實施例的電路結構示意圖；第3圖繪示第1圖中的功率開關串聯電路的第二優選實施例的電路結構示意圖；第4A圖繪示第3圖中的串聯模組10的均壓電路105的電路示意圖；以及第4B圖繪示第3圖中的串聯模組10的第二檢測模組107的電路示意圖；第5A圖和第5B圖繪示第1圖中的串聯模組的功率開關在關斷時其控制電壓波形和流經功率開關的短路電流波形；第6A圖和第6B圖繪示第2圖的串聯模組的功率開關在施加了軟關斷操作時其控制電壓波形和流經功率開關的短路電流波形；第7圖繪示依據本發明的另一實施方式的功率開關串聯電路的控制方法的流程示意圖；以及第8圖繪示將本發明的功率開關串聯電路應用以多電平變換裝置的原理示意圖。 The reader has read the specific embodiments of the present invention with reference to the accompanying drawings. Various aspects of the invention will be more clearly understood. 1 is a schematic diagram showing the principle of a power switch series circuit according to an embodiment of the present invention; and FIG. 2 is a schematic diagram showing the circuit structure of the first preferred embodiment of the power switch series circuit of FIG. 1; A circuit configuration diagram of a second preferred embodiment of the power switch series circuit in FIG. 1 is shown; FIG. 4A is a circuit diagram of the voltage equalization circuit 105 of the series module 10 in FIG. 3; and FIG. 4B The circuit diagram of the second detection module 107 of the series module 10 in FIG. 3 is shown; FIG. 5A and FIG. 5B are diagrams showing the control voltage waveform of the power switch of the series module in FIG. 1 when the power switch is turned off. And the short-circuit current waveform flowing through the power switch; FIG. 6A and FIG. 6B are diagrams showing the control voltage waveform of the power switch of the series module of FIG. 2 and the short-circuit current waveform flowing through the power switch when the soft-off operation is applied 7 is a schematic flow chart showing a control method of a power switch series circuit according to another embodiment of the present invention; and FIG. 8 is a schematic diagram showing the principle of applying the power switch series circuit of the present invention to a multi-level conversion device. .
10、20‧‧‧串聯模組 10, 20‧‧‧ series module
30‧‧‧比較模組 30‧‧‧Comparative Module
40‧‧‧控制模組 40‧‧‧Control Module
50‧‧‧驅動模組 50‧‧‧Drive Module
101、201‧‧‧功率開關 101, 201‧‧‧ power switch
103‧‧‧第一檢測單元 103‧‧‧First detection unit
Claims (21)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110294551 | 2011-09-29 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| TW201315074A TW201315074A (en) | 2013-04-01 |
| TWI459673B true TWI459673B (en) | 2014-11-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| TW100141133A TWI459673B (en) | 2011-09-29 | 2011-11-10 | Power switch series circuit, control method thereof, and multilevel power conversion apparatus |
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| Country | Link |
|---|---|
| TW (1) | TWI459673B (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104065253B (en) | 2014-06-25 | 2017-12-19 | 台达电子企业管理（上海）有限公司 | Power-converting device, drive device and driving method |
| CN104052248B (en) | 2014-06-25 | 2016-08-24 | 台达电子企业管理（上海）有限公司 | Power-converting device and protection signal transfer method thereof |
| CN106771955B (en) * | 2016-09-18 | 2023-07-28 | 深圳市禾望电气股份有限公司 | Device and method for detecting faults of semiconductor device |
| CN109714033B (en) * | 2019-02-22 | 2023-06-30 | 瓴芯电子科技(无锡)有限公司 | Driving device and method for power device |
| CN112180151B (en) * | 2020-09-30 | 2023-08-04 | 环旭电子股份有限公司 | Power detection device and method thereof |
-
2011
- 2011-11-10 TW TW100141133A patent/TWI459673B/en active
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| Publication number | Publication date |
|---|---|
| TW201315074A (en) | 2013-04-01 |
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