TWI568119B - Power supply apparatus with over power protection function - Google Patents
Power supply apparatus with over power protection function Download PDFInfo
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- TWI568119B TWI568119B TW103135146A TW103135146A TWI568119B TW I568119 B TWI568119 B TW I568119B TW 103135146 A TW103135146 A TW 103135146A TW 103135146 A TW103135146 A TW 103135146A TW I568119 B TWI568119 B TW I568119B
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Description
本發明係有關於一種電源供應裝置，特別是一種具有過功率保護功能的電源供應裝置。The present invention relates to a power supply device, and more particularly to a power supply device having an overpower protection function.
電源供應裝置提供電源給電子裝置，藉以驅動電子裝置。如果電源供應裝置係利用通用串列匯流排介面傳送電源，則電子裝置會通知電源供應裝置需求的電壓（例如5伏特或是20伏特）。The power supply device supplies power to the electronic device to drive the electronic device. If the power supply unit uses a universal serial bus interface to transmit power, the electronic device notifies the power supply device of the required voltage (eg, 5 volts or 20 volts).
電源供應裝置包含變壓器及脈波寬度調變控制器，變壓器包含初級側繞組、輔助繞組及次級側繞組；當電子裝置通知電源供應裝置需求的電壓時，脈波寬度調變控制器會改變初級側繞組的電壓，次級側繞組會感應初級側繞組的電壓而產生電壓以傳送至電子裝置；同時，輔助繞組會感應次級側繞組的電壓而產生電壓以傳送至脈波寬度調變控制器以供電予脈波寬度調變控制器。The power supply device comprises a transformer and a pulse width modulation controller, and the transformer comprises a primary side winding, an auxiliary winding and a secondary side winding; when the electronic device notifies the voltage required by the power supply device, the pulse width modulation controller changes the primary The voltage of the side winding, the secondary side winding senses the voltage of the primary side winding to generate a voltage for transmission to the electronic device; meanwhile, the auxiliary winding senses the voltage of the secondary side winding to generate a voltage for transmission to the pulse width modulation controller Power is supplied to the pulse width modulation controller.
一般來說，當使用通用串列匯流排介面傳送電源時，電源供應裝置的輸出電流會被限制在約2安培左右；因此，電源供應裝置的輸出功率被限制住了。為了在被限制住的輸出電流的情況能提高電源供應裝置的輸出功率，電源供應裝置的輸出電壓將會被提高；例如，電源供應裝置的輸出電壓由5伏特提高至20伏特。In general, when the power is transmitted using the universal serial bus interface, the output current of the power supply device is limited to about 2 amps; therefore, the output power of the power supply device is limited. In order to increase the output power of the power supply device in the case of the limited output current, the output voltage of the power supply device will be increased; for example, the output voltage of the power supply device is increased from 5 volts to 20 volts.
一般來說，電源供應裝置的過功率保護功能是固定的（以輸出電壓5伏特或輸出電壓20伏特設計）；若電源供應裝置的過功率保護功能是以輸出電壓20伏特所設計的，則當電源供應裝置的輸出電壓為5伏特時，電源供應裝置的過功率保護功能將不能順利地運作。In general, the overpower protection function of the power supply unit is fixed (designed at an output voltage of 5 volts or an output voltage of 20 volts); if the overpower protection function of the power supply unit is designed with an output voltage of 20 volts, then When the output voltage of the power supply unit is 5 volts, the overpower protection function of the power supply unit will not operate smoothly.
請參考圖3，其係為相關技術之電源供應裝置之過功率保護功能在輸出電壓為20伏特時之過功率保護電壓波形圖；請參考圖4，其係為相關技術之電源供應裝置之過功率保護功能在輸出電壓為5伏特時之過功率保護電壓波形圖。由於輸出電壓為5伏特的過功率保護電壓的觸發準位與輸出電壓為20伏特的過功率保護電壓的觸發準位相同，因此輸出電壓為5伏特時的輸出電流必須大於輸出電壓為20伏特時的輸出電流，以達到過功率保護電壓的觸發準位；如果輸出電流更大，則電源供應裝置中的功率元件將工作在大於額定電壓或額定電流的狀態，使得功率元件直接地造成傷害。Please refer to FIG. 3 , which is a waveform diagram of an over-power protection voltage of an over-power protection function of a related art power supply device at an output voltage of 20 volts; please refer to FIG. 4 , which is a related art power supply device. The over-power protection voltage waveform of the power protection function at an output voltage of 5 volts. Since the trigger level of the over-power protection voltage with an output voltage of 5 volts is the same as the trigger level of the over-power protection voltage with an output voltage of 20 volts, the output current at an output voltage of 5 volts must be greater than the output voltage of 20 volts. The output current is used to reach the trigger level of the over-power protection voltage; if the output current is larger, the power components in the power supply device will operate at a state greater than the rated voltage or rated current, causing the power component to directly cause damage.
為改善上述習知技術之缺點，本發明之目的在於提供一種具有過功率保護功能的電源供應裝置。In order to improve the above disadvantages of the prior art, it is an object of the present invention to provide a power supply device having an overpower protection function.
為達成本發明之上述目的，本發明之具有過功率保護功能的電源供應裝置包含一主轉換器；一電壓疊加電路，電性連接至該主轉換器；一電壓偵測電路，電性連接至該主轉換器及該電壓疊加電路；及一脈波寬度調變控制器，電性連接至該主轉換器及該電壓偵測電路。其中該主轉換器包含一感應電阻，電性連接至該電壓偵測電路。其中該電壓偵測電路偵測該感應電阻之一感應電壓；當該具有過功率保護功能的電源供應裝置之一輸出電壓小於一預設輸出電壓時，該電壓疊加電路提供一疊加電壓至該電壓偵測電路，接著該電壓偵測電路傳送該感應電壓及該疊加電壓至該脈波寬度調變控制器；當該感應電壓加上該疊加電壓大於一過功率保護電壓時，該脈波寬度調變控制器控制該主轉換器停止工作。In order to achieve the above object of the present invention, a power supply device having an overpower protection function includes a main converter; a voltage superimposing circuit electrically connected to the main converter; and a voltage detecting circuit electrically connected to The main converter and the voltage superimposing circuit; and a pulse width modulation controller electrically connected to the main converter and the voltage detecting circuit. The main converter includes a sensing resistor electrically connected to the voltage detecting circuit. The voltage detecting circuit detects an induced voltage of the sensing resistor; when the output voltage of the power supply device having the overpower protection function is less than a predetermined output voltage, the voltage superimposing circuit provides a superimposed voltage to the voltage a detection circuit, and then the voltage detection circuit transmits the induced voltage and the superimposed voltage to the pulse width modulation controller; when the induced voltage plus the superimposed voltage is greater than an overpower protection voltage, the pulse width is adjusted The variable controller controls the main converter to stop working.
本發明之功效在於不論電源供應裝置的輸出電壓為何，電源供應裝置的過功率保護功能皆能順利地運作，且電源供應裝置所增加的電路的成本低廉且所增加的電路位於電源供應裝置的一次側。The effect of the present invention is that the over-power protection function of the power supply device can operate smoothly regardless of the output voltage of the power supply device, and the added circuit of the power supply device is low in cost and the added circuit is located once in the power supply device. side.
10‧‧‧具有過功率保護功能的電源供應裝置10‧‧‧Power supply unit with over-power protection
20‧‧‧交流電源供應裝置20‧‧‧AC power supply unit
30‧‧‧電子裝置30‧‧‧Electronic devices
102‧‧‧主轉換器102‧‧‧Main converter
104‧‧‧電壓疊加電路104‧‧‧Voltage superposition circuit
106‧‧‧電壓偵測電路106‧‧‧Voltage detection circuit
108‧‧‧脈波寬度調變控制器108‧‧‧ Pulse width modulation controller
110‧‧‧變壓器110‧‧‧Transformers
112‧‧‧初級側繞組112‧‧‧Primary winding
114‧‧‧次級側繞組114‧‧‧Secondary side winding
116‧‧‧輔助繞組116‧‧‧Auxiliary winding
118‧‧‧電晶體開關118‧‧‧Transistor Switch
120‧‧‧初級側濾波電路120‧‧‧Primary side filter circuit
122‧‧‧初級側整流電路122‧‧‧Primary side rectifier circuit
124‧‧‧次級側整流電路124‧‧‧Secondary side rectifier circuit
126‧‧‧次級側濾波電路126‧‧‧Secondary side filter circuit
128‧‧‧電磁干擾濾波器128‧‧‧Electromagnetic interference filter
130‧‧‧通用串列匯流排介面130‧‧‧Common Serial Bus Interface
132‧‧‧交握電路132‧‧‧Cross-grip circuit
134‧‧‧回授電路134‧‧‧Return circuit
10402‧‧‧第一二極體10402‧‧‧First Diode
10404‧‧‧第一電容10404‧‧‧First capacitor
10406‧‧‧第一齊納二極體10406‧‧‧First Zener diode
10408‧‧‧第一電阻10408‧‧‧First resistance
10410‧‧‧第二電阻10410‧‧‧second resistance
10412‧‧‧第一金屬氧化物半導體場效應電晶體10412‧‧‧First Metal Oxide Semiconductor Field Effect Transistor
10414‧‧‧第二金屬氧化物半導體場效應電晶體10414‧‧‧Second metal oxide semiconductor field effect transistor
10416‧‧‧第三電阻10416‧‧‧ Third resistor
10418‧‧‧第四電阻10418‧‧‧fourth resistor
10420‧‧‧第二電容10420‧‧‧second capacitor
10422‧‧‧疊加電壓產生電路10422‧‧‧Overlay voltage generation circuit
10424‧‧‧疊加電壓控制電路10424‧‧‧Overlay voltage control circuit
10602‧‧‧感應電阻10602‧‧‧Induction resistance
10604‧‧‧第五電阻10604‧‧‧ fifth resistor
10606‧‧‧第六電阻10606‧‧‧6th resistor
10608‧‧‧第三電容10608‧‧‧ third capacitor
圖1為本發明之具有過功率保護功能的電源供應裝置方塊圖。1 is a block diagram of a power supply device having an overpower protection function according to the present invention.
圖2為本發明之電壓疊加電路及電壓偵測電路之一實施例電路圖。2 is a circuit diagram of an embodiment of a voltage superimposing circuit and a voltage detecting circuit of the present invention.
圖3為相關技術之電源供應裝置之過功率保護功能在輸出電壓為20伏特時之過功率保護電壓波形圖。3 is a waveform diagram of an over-power protection voltage of an over-power protection function of a power supply device of the related art at an output voltage of 20 volts.
圖4為相關技術之電源供應裝置之過功率保護功能在輸出電壓為5伏特時之過功率保護電壓波形圖。4 is a waveform diagram of an over-power protection voltage of an over-power protection function of a power supply device of the related art at an output voltage of 5 volts.
圖5為本發明之具有過功率保護功能的電源供應裝置之過功率保護功能在輸出電壓為5伏特時之過功率保護電壓波形圖。FIG. 5 is a waveform diagram of the over-power protection voltage of the over-power protection function of the power supply device with over-power protection function at an output voltage of 5 volts according to the present invention.
請參考圖1，其係為本發明之具有過功率保護功能的電源供應裝置方塊圖；一具有過功率保護功能的電源供應裝置10係應用於一交流電源供應裝置20及一電子裝置30。Please refer to FIG. 1 , which is a block diagram of a power supply device with an over power protection function according to the present invention; a power supply device 10 having an over power protection function is applied to an AC power supply device 20 and an electronic device 30 .
該具有過功率保護功能的電源供應裝置10包含一主轉換器102、一電壓疊加電路104、一電壓偵測電路106、一脈波寬度調變控制器108、一初級側濾波電路120、一初級側整流電路122、一次級側整流電路124、一次級側濾波電路126、一電磁干擾濾波器128、一通用串列匯流排介面130、一交握電路（handshake circuit）132及一回授電路134。The power supply device 10 with over power protection function includes a main converter 102, a voltage superposition circuit 104, a voltage detection circuit 106, a pulse width modulation controller 108, a primary side filter circuit 120, and a primary The side rectification circuit 122, the primary-stage side rectification circuit 124, the primary-stage side filter circuit 126, an electromagnetic interference filter 128, a universal serial bus interface 130, a handshake circuit 132, and a feedback circuit 134 .
該主轉換器102包含一變壓器110、一電晶體開關118及一感應電阻10602；該變壓器110包含一初級側繞組112、一次級側繞組114及一輔助繞組116。該電晶體開關118可為例如但不限定為一金屬氧化物半導體場效應電晶體。The main converter 102 includes a transformer 110, a transistor switch 118 and a sense resistor 10602. The transformer 110 includes a primary side winding 112, a primary side winding 114 and an auxiliary winding 116. The transistor switch 118 can be, for example but not limited to, a metal oxide semiconductor field effect transistor.
該電壓疊加電路104電性連接至該主轉換器102；該電壓偵測電路106電性連接至該主轉換器102及該電壓疊加電路104；該脈波寬度調變控制器108電性連接至該主轉換器102及該電壓偵測電路106；該變壓器110電性連接至該電壓疊加電路104、該脈波寬度調變控制器108及該感應電阻10602；該電晶體開關118電性連接至該初級側繞組112、該電壓偵測電路106、該脈波寬度調變控制器108及該感應電阻10602；該輔助繞組116電性連接至該電壓疊加電路104。The voltage superimposing circuit 104 is electrically connected to the main converter 102; the voltage detecting circuit 106 is electrically connected to the main converter 102 and the voltage superimposing circuit 104; the pulse width modulation controller 108 is electrically connected to The main converter 102 and the voltage detecting circuit 106; the transformer 110 is electrically connected to the voltage superimposing circuit 104, the pulse width modulation controller 108 and the sensing resistor 10602; the transistor switch 118 is electrically connected to The primary winding 112, the voltage detecting circuit 106, the pulse width modulation controller 108, and the sensing resistor 10602; the auxiliary winding 116 is electrically connected to the voltage superimposing circuit 104.
該初級側濾波電路120電性連接至該初級側繞組112；該初級側整流電路122電性連接至該初級側濾波電路120；該次級側整流電路124電性連接至該次級側繞組114；該次級側濾波電路126電性連接至該次級側整流電路124；該電磁干擾濾波器128電性連接至該初級側整流電路122及該交流電源供應裝置20。The primary side filter circuit 120 is electrically connected to the primary side winding 112; the primary side rectifier circuit 122 is electrically connected to the primary side filter circuit 120; the secondary side rectifier circuit 124 is electrically connected to the secondary side winding 114 The secondary side filter circuit 126 is electrically connected to the secondary side rectifier circuit 124; the electromagnetic interference filter 128 is electrically connected to the primary side rectifier circuit 122 and the AC power supply device 20.
該通用串列匯流排介面130電性連接至該次級側濾波電路126及該電子裝置30；該交握電路132電性連接至該通用串列匯流排介面130；該回授電路134電性連接至該交握電路132、該次級側濾波電路126、該通用串列匯流排介面130及該脈波寬度調變控制器108；該感應電阻10602電性連接至該電壓偵測電路106。The universal serial bus interface 130 is electrically connected to the secondary side filter circuit 126 and the electronic device 30; the handshake circuit 132 is electrically connected to the universal serial bus interface 130; the feedback circuit 134 is electrically The sensing resistors 10602 are electrically connected to the voltage detecting circuit 106. The sensing circuit 10 is electrically connected to the voltage detecting circuit 106. The sensing circuit is electrically connected to the voltage detecting circuit 106.
請參考圖2，其係為本發明之電壓疊加電路及電壓偵測電路之一實施例電路圖。該電壓疊加電路104包含一疊加電壓產生電路10422、一疊加電壓控制電路10424、一第一二極體10402及一第一電容10404；該疊加電壓產生電路10422電性連接至該電壓偵測電路106；該疊加電壓控制電路10424電性連接至該疊加電壓產生電路10422及該變壓器110之該輔助繞組116。Please refer to FIG. 2 , which is a circuit diagram of an embodiment of the voltage superimposing circuit and the voltage detecting circuit of the present invention. The voltage superimposing circuit 104 includes a superimposed voltage generating circuit 10422, a superimposed voltage control circuit 10424, a first diode 10402 and a first capacitor 10404. The superimposed voltage generating circuit 10422 is electrically connected to the voltage detecting circuit 106. The superimposed voltage control circuit 10424 is electrically connected to the superimposed voltage generating circuit 10422 and the auxiliary winding 116 of the transformer 110.
當該具有過功率保護功能的電源供應裝置10之一輸出電壓小於一預設輸出電壓時，該疊加電壓控制電路10424導通該疊加電壓產生電路10422，使得該疊加電壓產生電路10422提供一疊加電壓至該電壓偵測電路106。該第一二極體10402及該第一電容10404係用作濾波器使用。When the output voltage of one of the power supply devices 10 having the overpower protection function is less than a predetermined output voltage, the superimposed voltage control circuit 10424 turns on the superimposed voltage generating circuit 10422, so that the superimposed voltage generating circuit 10422 provides a superimposed voltage to The voltage detecting circuit 106. The first diode 10402 and the first capacitor 10404 are used as filters.
該疊加電壓控制電路10424包含一第一齊納二極體10406、一第一電阻10408、一第二電阻10410、一第一金屬氧化物半導體場效應電晶體10412及一第三電阻10416。該疊加電壓產生電路10422包含一第二金屬氧化物半導體場效應電晶體10414、一第四電阻10418及一第二電容10420。The superimposed voltage control circuit 10424 includes a first Zener diode 10406, a first resistor 10408, a second resistor 10410, a first metal oxide semiconductor field effect transistor 10412, and a third resistor 10416. The superimposed voltage generating circuit 10422 includes a second metal oxide semiconductor field effect transistor 10414, a fourth resistor 10418 and a second capacitor 10420.
該第一二極體10402電性連接至該輔助繞組116及該脈波寬度調變控制器108；該第一電容10404電性連接至該第一二極體10402及該脈波寬度調變控制器108；該第一齊納二極體10406電性連接至該第一二極體10402及該脈波寬度調變控制器108；該第一電阻10408電性連接至該第一齊納二極體10406；該第二電阻10410電性連接至該第一電阻10408；該第一金屬氧化物半導體場效應電晶體10412電性連接至該第一電阻10408；該第二金屬氧化物半導體場效應電晶體10414電性連接至該第一二極體10402、該第一金屬氧化物半導體場效應電晶體10412及該脈波寬度調變控制器108。The first diode 10402 is electrically connected to the auxiliary winding 116 and the pulse width modulation controller 108; the first capacitor 10404 is electrically connected to the first diode 10402 and the pulse width modulation control The first Zener diode 10406 is electrically connected to the first diode 10402 and the pulse width modulation controller 108; the first resistor 10408 is electrically connected to the first Zener diode The second resistor 10410 is electrically connected to the first resistor 10408; the first metal oxide semiconductor field effect transistor 10412 is electrically connected to the first resistor 10408; the second metal oxide semiconductor field effect electricity The crystal 1014 is electrically connected to the first diode 10402, the first metal oxide semiconductor field effect transistor 10412, and the pulse width modulation controller 108.
該第三電阻10416電性連接至該第一二極體10402、該第一金屬氧化物半導體場效應電晶體10412、該第二金屬氧化物半導體場效應電晶體10414及該脈波寬度調變控制器108；該第四電阻10418電性連接至該第二金屬氧化物半導體場效應電晶體10414及該電壓偵測電路106；該第二電容10420電性連接至該第一二極體10402、該第二金屬氧化物半導體場效應電晶體10414及該脈波寬度調變控制器108。該第二電容10420係用以供電予該脈波寬度調變控制器108。The third resistor 10416 is electrically connected to the first diode 10402, the first metal oxide semiconductor field effect transistor 10412, the second metal oxide semiconductor field effect transistor 10414, and the pulse width modulation control The fourth resistor 10418 is electrically connected to the second metal oxide semiconductor field effect transistor 10414 and the voltage detecting circuit 106; the second capacitor 10420 is electrically connected to the first diode 10402, A second metal oxide semiconductor field effect transistor 10414 and the pulse width modulation controller 108. The second capacitor 10420 is for supplying power to the pulse width modulation controller 108.
換句話說，該第一二極體10402的陽極連接至該輔助繞組116；該第一二極體10402的陰極連接至該脈波寬度調變控制器108；該第一電容10404的一端連接至該第一二極體10402的陰極及該脈波寬度調變控制器108，該第一電容10404的另一端接地；該第一齊納二極體10406的陰極連接至該第一二極體10402的陰極、該第一電容10404的一端及該脈波寬度調變控制器108；該第一電阻10408的一端連接至該第一齊納二極體10406的陽極；該第二電阻10410的一端連接至該第一電阻10408的另一端；該第二電阻10410的另一端接地。In other words, the anode of the first diode 10402 is connected to the auxiliary winding 116; the cathode of the first diode 10402 is connected to the pulse width modulation controller 108; one end of the first capacitor 10404 is connected to The cathode of the first diode 10402 and the pulse width modulation controller 108, the other end of the first capacitor 10404 is grounded; the cathode of the first Zener diode 10406 is connected to the first diode 10402 a cathode, an end of the first capacitor 10404 and the pulse width modulation controller 108; one end of the first resistor 10408 is connected to the anode of the first Zener diode 10406; one end of the second resistor 10410 is connected To the other end of the first resistor 10408; the other end of the second resistor 10410 is grounded.
該第一金屬氧化物半導體場效應電晶體10412的閘極連接至該第一電阻10408的另一端及該第二電阻10410的一端，該第一金屬氧化物半導體場效應電晶體10412的源極接地；該第二金屬氧化物半導體場效應電晶體10414的閘極連接至該第一金屬氧化物半導體場效應電晶體10412的汲極，該第二金屬氧化物半導體場效應電晶體10414的汲極連接至該第一二極體10402的陰極、該第一電容10404的一端、該第一齊納二極體10406的陰極及該脈波寬度調變控制器108。The gate of the first metal oxide semiconductor field effect transistor 10412 is connected to the other end of the first resistor 10408 and one end of the second resistor 10410. The source of the first metal oxide semiconductor field effect transistor 10412 is grounded. The gate of the second metal oxide semiconductor field effect transistor 10414 is connected to the drain of the first metal oxide semiconductor field effect transistor 10412, and the drain of the second metal oxide semiconductor field effect transistor 10414 is connected The cathode of the first diode 10402, one end of the first capacitor 10404, the cathode of the first Zener diode 10406, and the pulse width modulation controller 108.
該第三電阻10416的一端連接至該第一二極體10402的陰極、該第一電容10404的一端、該第一齊納二極體10406的陰極、該第二金屬氧化物半導體場效應電晶體10414的汲極及該脈波寬度調變控制器108，該第三電阻10416的另一端連接至該第一金屬氧化物半導體場效應電晶體10412的汲極及該第二金屬氧化物半導體場效應電晶體10414的閘極；該第四電阻10418的一端連接至該第二金屬氧化物半導體場效應電晶體10414的源極，該第四電阻10418的另一端連接至該電壓偵測電路106；該第二電容10420的一端連接至該第一二極體10402的陰極、該第一電容10404的一端、該第一齊納二極體10406的陰極、該第二金屬氧化物半導體場效應電晶體10414的汲極、該第三電阻10416的一端及該脈波寬度調變控制器108，該第二電容10420的另一端接地。One end of the third resistor 10416 is connected to the cathode of the first diode 10402, one end of the first capacitor 10404, the cathode of the first Zener diode 10406, and the second metal oxide semiconductor field effect transistor. a drain of 10414 and the pulse width modulation controller 108, the other end of the third resistor 10416 is connected to the drain of the first metal oxide semiconductor field effect transistor 10412 and the second metal oxide semiconductor field effect a gate of the transistor 10414; one end of the fourth resistor 10418 is connected to the source of the second metal oxide semiconductor field effect transistor 10414, and the other end of the fourth resistor 10418 is connected to the voltage detecting circuit 106; One end of the second capacitor 10420 is connected to the cathode of the first diode 10402, one end of the first capacitor 10404, the cathode of the first Zener diode 10406, and the second metal oxide semiconductor field effect transistor 10414. The drain, the one end of the third resistor 10416 and the pulse width modulation controller 108, the other end of the second capacitor 10420 is grounded.
該電壓偵測電路106包含一第五電阻10604、一第六電阻10606及一第三電容10608。The voltage detecting circuit 106 includes a fifth resistor 10604, a sixth resistor 10606, and a third capacitor 10608.
該第五電阻10604電性連接至該電晶體開關118、該第四電阻10418及該感應電阻10602；該第六電阻10606電性連接至該第四電阻10418、該第五電阻10604及該脈波寬度調變控制器108；該第三電容10608電性連接至該第六電阻10606及該脈波寬度調變控制器108。The fifth resistor 10604 is electrically connected to the transistor switch 118, the fourth resistor 10418 and the sensing resistor 10602. The sixth resistor 10606 is electrically connected to the fourth resistor 10418, the fifth resistor 10604, and the pulse wave. The width modulation controller 108 is electrically connected to the sixth resistor 10606 and the pulse width modulation controller 108.
換句話說，該感應電阻10602的一端連接至該電晶體開關118，該感應電阻10602的另一端接地；該第五電阻10604的一端連接至該電晶體開關118及該感應電阻10602的一端，該第五電阻10604的另一端連接至該第四電阻10418的另一端；該第六電阻10606的一端連接至該第四電阻10418的另一端及該第五電阻10604的另一端，該第六電阻10606的另一端連接至該脈波寬度調變控制器108；該第三電容10608的一端連接至該脈波寬度調變控制器108及該第六電阻10606的另一端，該第三電容10608的另一端接地。In other words, one end of the sensing resistor 10602 is connected to the transistor switch 118, and the other end of the sensing resistor 10602 is grounded. One end of the fifth resistor 10604 is connected to the transistor switch 118 and one end of the sensing resistor 10602. The other end of the fifth resistor 10604 is connected to the other end of the fourth resistor 10418; one end of the sixth resistor 10606 is connected to the other end of the fourth resistor 10418 and the other end of the fifth resistor 10604, the sixth resistor 10606 The other end is connected to the pulse width modulation controller 108; one end of the third capacitor 10608 is connected to the pulse width modulation controller 108 and the other end of the sixth resistor 10606, and the third capacitor 10608 is another One end is grounded.
請同時參考圖1及圖2。該電子裝置30通過該通用串列匯流排介面130、該交握電路132及該回授電路134通知該脈波寬度調變控制器108一需求的電壓（例如5伏特或是20伏特）；因此，該脈波寬度調變控制器108控制該電晶體開關118以改變該初級側繞組112的一初級側繞組電壓；其中，該主轉換器102可為例如但不限定為一返馳式轉換器，該脈波寬度調變控制器108控制該電晶體開關118以改變該初級側繞組112的該初級側繞組電壓係為一習知技術，為簡潔因素，故於此不再贅述。Please also refer to Figure 1 and Figure 2. The electronic device 30 notifies the pulse width modulation controller 108 of a required voltage (for example, 5 volts or 20 volts) through the universal serial bus interface 130, the handshake circuit 132, and the feedback circuit 134; The pulse width modulation controller 108 controls the transistor switch 118 to change a primary side winding voltage of the primary side winding 112; wherein the main converter 102 can be, for example but not limited to, a flyback converter The pulse width modulation controller 108 controls the transistor switch 118 to change the primary side winding voltage of the primary side winding 112 as a conventional technique, which is a concise factor and will not be described herein.
該電壓偵測電路106偵測該感應電阻10602之一感應電壓；該電壓偵測電路106通知該脈波寬度調變控制器108該感應電壓；該具有過功率保護功能的電源供應裝置10（該脈波寬度調變控制器108）的過功率保護功能係為了該需求的電壓為20伏特所設計；因此，當該需求的電壓為20伏特，過功率保護功能能夠順利地運作。The voltage detecting circuit 106 detects an induced voltage of the sensing resistor 10602; the voltage detecting circuit 106 notifies the pulse width modulation controller 108 of the induced voltage; and the power supply device 10 having an overpower protection function (the The over-power protection function of the pulse width modulation controller 108) is designed for the required voltage of 20 volts; therefore, when the required voltage is 20 volts, the over-power protection function can operate smoothly.
以下將敘述當該需求的電壓為5伏特時，過功率保護功能如何也能夠順利地運作。The following will describe how the over-power protection function can operate smoothly when the required voltage is 5 volts.
當該需求的電壓為20伏特時，該輔助繞組116之一輔助繞組電壓係為例如80伏特；當該需求的電壓為5伏特時，該輔助繞組116之該輔助繞組電壓係為例如20伏特；此係為習知技術，為簡潔因素，故於此不再贅述。When the required voltage is 20 volts, one of the auxiliary windings 116 has an auxiliary winding voltage of, for example, 80 volts; when the required voltage is 5 volts, the auxiliary winding voltage of the auxiliary winding 116 is, for example, 20 volts; This is a well-known technique and is a concise factor, so it will not be repeated here.
該第一齊納二極體10406的一崩潰電壓係為一預設電壓，大於20伏特但小於80伏特，例如40伏特；因此當該輔助繞組電壓為80伏特時（該需求的電壓為20伏特），該第一金屬氧化物半導體場效應電晶體10412會導通，該第二金屬氧化物半導體場效應電晶體10414不會導通，該輔助繞組電壓不會被傳送至該電壓偵測電路106。A breakdown voltage of the first Zener diode 10406 is a predetermined voltage greater than 20 volts but less than 80 volts, for example 40 volts; therefore, when the auxiliary winding voltage is 80 volts (the required voltage is 20 volts) The first MOSFET field transistor 10412 is turned on, the second MOSFET field 10414 is not turned on, and the auxiliary winding voltage is not transmitted to the voltage detecting circuit 106.
該電壓偵測電路106傳送該感應電壓至該脈波寬度調變控制器108；該脈波寬度調變控制器108判斷是否該啟動過功率保護功能；此係為該具有過功率保護功能的電源供應裝置10（該脈波寬度調變控制器108）原本的過功率保護功能。The voltage detecting circuit 106 transmits the induced voltage to the pulse width modulation controller 108; the pulse width modulation controller 108 determines whether the power protection function is activated; this is the power source with the overpower protection function. The original device 10 (the pulse width modulation controller 108) has an overpower protection function.
當該主轉換器102（該輔助繞組116）之該輔助繞組電壓（20伏特）小於該預設電壓（40伏特）時（該需求的電壓為5伏特），該第一金屬氧化物半導體場效應電晶體10412不會導通，該第二金屬氧化物半導體場效應電晶體10414會導通，該輔助繞組電壓會被傳送至該電壓偵測電路106。The first metal oxide semiconductor field effect when the auxiliary winding voltage (20 volts) of the main converter 102 (the auxiliary winding 116) is less than the predetermined voltage (40 volts) (the required voltage is 5 volts) The transistor 10412 is not turned on, the second MOSFET 1041 is turned on, and the auxiliary winding voltage is transmitted to the voltage detecting circuit 106.
換句話說，該電壓疊加電路104係提供該疊加電壓（即該輔助繞組電壓）至該電壓偵測電路106，接著該電壓偵測電路106傳送該感應電壓及該疊加電壓至該脈波寬度調變控制器108；藉此，該脈波寬度調變控制器108判斷是否該啟動過電壓（功率）保護功能；亦即，當該感應電壓加上該疊加電壓大於一過功率保護電壓時，該脈波寬度調變控制器108控制該主轉換器102停止工作。In other words, the voltage superimposing circuit 104 supplies the superimposed voltage (ie, the auxiliary winding voltage) to the voltage detecting circuit 106, and then the voltage detecting circuit 106 transmits the induced voltage and the superimposed voltage to the pulse width modulation. The variable controller 108; thereby, the pulse width modulation controller 108 determines whether the overvoltage (power) protection function is activated; that is, when the induced voltage plus the superimposed voltage is greater than an overpower protection voltage, The pulse width modulation controller 108 controls the main converter 102 to stop operating.
當該需求的電壓為5伏特時，該脈波寬度調變控制器108係接收了該感應電壓及該疊加電壓（不僅僅只是該感應電壓）；該脈波寬度調變控制器108所接收的該感應電壓被墊高（被該疊加電壓墊高）以能正確地觸發過功率保護功能，因此過功率保護功能能夠順利地運作。When the required voltage is 5 volts, the pulse width modulation controller 108 receives the induced voltage and the superimposed voltage (not just the induced voltage); the pulse width modulation controller 108 receives The induced voltage is padded (higher by the superimposed voltage) to properly trigger the over-power protection function, so the over-power protection function can operate smoothly.
亦即，當該具有過功率保護功能的電源供應裝置10之該輸出電壓（例如5伏特）小於該預設輸出電壓（例如10伏特）時，該電壓疊加電路104提供該疊加電壓至該電壓偵測電路106。That is, when the output voltage (for example, 5 volts) of the power supply device 10 having the overpower protection function is less than the predetermined output voltage (for example, 10 volts), the voltage superimposing circuit 104 supplies the superimposed voltage to the voltage Detector. Circuit 106.
上述實施例所述之該疊加電壓係為該輔助繞組電壓，然本發明並不以此為限；該疊加電壓亦可為來自該具有過功率保護功能的電源供應裝置10的一次側或二次側的一電壓源，該電壓源連接至該第二金屬氧化物半導體場效應電晶體10414的汲極、該第三電阻10416的一端及該第二電容10420的一端，但該電壓源不連接至該第一二極體10402的陰極、該第一電容10404的一端及該第一齊納二極體10406的陰極（亦即，圖2所示之電路必需被調整）。The superimposed voltage described in the above embodiment is the auxiliary winding voltage, but the invention is not limited thereto; the superimposed voltage may also be the primary side or the secondary of the power supply device 10 having the over-power protection function. a voltage source connected to the drain of the second metal oxide semiconductor field effect transistor 10414, one end of the third resistor 10416, and one end of the second capacitor 10420, but the voltage source is not connected to The cathode of the first diode 10402, one end of the first capacitor 10404, and the cathode of the first Zener diode 10406 (that is, the circuit shown in FIG. 2 must be adjusted).
請參考圖5，其係為本發明之具有過功率保護功能的電源供應裝置之過功率保護功能在輸出電壓為5伏特時之過功率保護電壓波形圖；圖5所示的電壓的斜率與圖4所示的電壓的斜率大致相同，但圖5所示的電壓被該疊加電壓墊高了；當該具有過功率保護功能的電源供應裝置10的輸出電流提高時，可提高該第三電容10608的電壓；因此，與圖4比較，同樣皆為輸出電壓為5伏特，圖5的補償機制使得不需要更大的輸出電流即可達到與輸出電壓為20伏特時的過功率保護電壓觸發準位相同的過功率保護電壓觸發準位；亦即，即使輸出電壓為5伏特，該具有過功率保護功能的電源供應裝置10也能夠有正確適當的過功率保護機制，以避免該具有過功率保護功能的電源供應裝置10中的功率元件工作在大於額定電壓或額定電流的狀態。Please refer to FIG. 5 , which is a waveform diagram of the over-power protection voltage of the over-power protection function of the power supply device with over-power protection function at the output voltage of 5 volts; the slope and graph of the voltage shown in FIG. 5 . The slope of the voltage shown in FIG. 4 is substantially the same, but the voltage shown in FIG. 5 is raised by the superimposed voltage; when the output current of the power supply device 10 having the over-power protection function is increased, the third capacitor 10608 can be increased. Therefore, compared with Figure 4, the output voltage is also 5 volts. The compensation mechanism of Figure 5 makes it possible to achieve an over-power protection voltage trigger level with an output voltage of 20 volts without requiring a larger output current. The same over-power protection voltage trigger level; that is, even if the output voltage is 5 volts, the power supply device 10 with over-power protection function can have a proper and appropriate over-power protection mechanism to avoid the over-power protection function. The power components in the power supply unit 10 operate at a state greater than the rated voltage or rated current.
其中，雖然上述內容係針對電壓來討論，但由電壓即可求得電流，而功率係為電壓與電流之乘積，因此對本發明來說，過功率保護應與過電壓保護有類似的意義。Among them, although the above content is discussed with respect to voltage, the current can be obtained from the voltage, and the power is the product of the voltage and the current. Therefore, for the present invention, the over-power protection should have a similar meaning to the over-voltage protection.
本發明之優點在於不論電源供應裝置的輸出電壓為何（例如，上述之5伏特或20伏特），電源供應裝置的過功率保護功能皆能順利地運作，且電源供應裝置所增加的電路的成本低廉且所增加的電路位於電源供應裝置的一次側。An advantage of the present invention is that regardless of the output voltage of the power supply device (for example, 5 volts or 20 volts as described above), the overpower protection function of the power supply device can operate smoothly, and the circuit of the power supply device increases the cost of the circuit. And the added circuit is located on the primary side of the power supply.
本發明可保護該變壓器110及該電子裝置30；當該電壓偵測電路106偵測到電壓（電流）已經達到過電流保護點，該脈波寬度調變控制器108會斷開該電晶體開關118，藉此保護該具有過功率保護功能的電源供應裝置10以及該電子裝置30；亦即，依據該電壓偵測電路106所傳送至該脈波寬度調變控制器108的電壓，該脈波寬度調變控制器108會控制該電晶體開關118的導通狀態。The present invention protects the transformer 110 and the electronic device 30; when the voltage detecting circuit 106 detects that the voltage (current) has reached the overcurrent protection point, the pulse width modulation controller 108 turns off the transistor switch. 118, thereby protecting the power supply device 10 having the over-power protection function and the electronic device 30; that is, according to the voltage transmitted by the voltage detecting circuit 106 to the pulse width modulation controller 108, the pulse wave The width modulation controller 108 controls the conduction state of the transistor switch 118.
綜上所述，當知本發明已具有產業利用性、新穎性與進步性，又本發明之構造亦未曾見於同類產品及公開使用，完全符合發明專利申請要件，爰依專利法提出申請。In summary, it is known that the present invention has industrial applicability, novelty and advancement, and the structure of the present invention has not been seen in similar products and public use, and fully complies with the requirements of the invention patent application, and is filed according to the patent law.
10‧‧‧具有過功率保護功能的電源供應裝置 10‧‧‧Power supply unit with over-power protection
20‧‧‧交流電源供應裝置 20‧‧‧AC power supply unit
30‧‧‧電子裝置 30‧‧‧Electronic devices
102‧‧‧主轉換器 102‧‧‧Main converter
104‧‧‧電壓疊加電路 104‧‧‧Voltage superposition circuit
106‧‧‧電壓偵測電路 106‧‧‧Voltage detection circuit
108‧‧‧脈波寬度調變控制器 108‧‧‧ Pulse width modulation controller
110‧‧‧變壓器 110‧‧‧Transformers
112‧‧‧初級側繞組 112‧‧‧Primary winding
114‧‧‧次級側繞組 114‧‧‧Secondary side winding
116‧‧‧輔助繞組 116‧‧‧Auxiliary winding
118‧‧‧電晶體開關 118‧‧‧Transistor Switch
120‧‧‧初級側濾波電路 120‧‧‧Primary side filter circuit
122‧‧‧初級側整流電路 122‧‧‧Primary side rectifier circuit
124‧‧‧次級側整流電路 124‧‧‧Secondary side rectifier circuit
126‧‧‧次級側濾波電路 126‧‧‧Secondary side filter circuit
128‧‧‧電磁干擾濾波器 128‧‧‧Electromagnetic interference filter
130‧‧‧通用串列匯流排介面 130‧‧‧Common Serial Bus Interface
132‧‧‧交握電路 132‧‧‧Cross-grip circuit
134‧‧‧回授電路 134‧‧‧Return circuit
10602‧‧‧感應電阻 10602‧‧‧Induction resistance
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW103135146A TWI568119B (en) | 2014-10-09 | 2014-10-09 | Power supply apparatus with over power protection function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| TW103135146A TWI568119B (en) | 2014-10-09 | 2014-10-09 | Power supply apparatus with over power protection function |
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| Publication Number | Publication Date |
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| TW201614918A TW201614918A (en) | 2016-04-16 |
| TWI568119B true TWI568119B (en) | 2017-01-21 |
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| CN109839525B (en) * | 2019-03-13 | 2021-02-02 | 深圳市鼎阳科技股份有限公司 | Over-power protection method and protection device for electronic load |
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| US6087782A (en) * | 1999-07-28 | 2000-07-11 | Philips Electronics North America Corporation | Resonant mode power supply having over-power and over-current protection |
| TWI269508B (en) * | 2005-04-11 | 2006-12-21 | System General Corp | An over-power protection apparatus |
| TWI306187B (en) * | 2005-10-13 | 2009-02-11 | System General Corp | An over-power protection apparatus with programmable over-current threshold for a power converter |
| CN100530921C (en) * | 2006-07-17 | 2009-08-19 | 尼克森微电子股份有限公司 | Flyback pulse width modulation device with power-saving mode |
| TW201416846A (en) * | 2012-10-22 | 2014-05-01 | Chicony Power Tech Co Ltd | Power supply apparatus with low standby power consumption |
| TWI443946B (en) * | 2010-07-29 | 2014-07-01 | Tpv Electronics Fujian Co Ltd | Over power protection (opp) compensation circuit and flyback power supply |
| TWM496290U (en) * | 2014-10-09 | 2015-02-21 | Chicony Power Tech Co Ltd | Power supply apparatus with over power protection function |
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2014
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| US6087782A (en) * | 1999-07-28 | 2000-07-11 | Philips Electronics North America Corporation | Resonant mode power supply having over-power and over-current protection |
| TWI269508B (en) * | 2005-04-11 | 2006-12-21 | System General Corp | An over-power protection apparatus |
| TWI306187B (en) * | 2005-10-13 | 2009-02-11 | System General Corp | An over-power protection apparatus with programmable over-current threshold for a power converter |
| CN100530921C (en) * | 2006-07-17 | 2009-08-19 | 尼克森微电子股份有限公司 | Flyback pulse width modulation device with power-saving mode |
| TWI443946B (en) * | 2010-07-29 | 2014-07-01 | Tpv Electronics Fujian Co Ltd | Over power protection (opp) compensation circuit and flyback power supply |
| TW201416846A (en) * | 2012-10-22 | 2014-05-01 | Chicony Power Tech Co Ltd | Power supply apparatus with low standby power consumption |
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| Publication number | Publication date |
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| TW201614918A (en) | 2016-04-16 |
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