TWI581535B - Over voltage protection circuit - Google Patents
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Description
本發明係有關於一種保護電路，特別是一種過電壓保護電路。 The present invention relates to a protection circuit, and more particularly to an overvoltage protection circuit.
大功率的矽控整流器(silicon controlled rectifier)或觸發電路通常被設置在電壓轉換裝置(尤其是待機電壓轉換裝置)之次級側；當次級側發生過電壓時，矽控整流器或觸發電路會接地以提供過電壓保護(保護次級側)。然而，此種方式的能量衝擊較大，使得矽控整流器或觸發電路容易損壞；當矽控整流器或觸發電路損壞時，過電壓保護即會失效。亦即，目前過電壓保護的缺點為：由於設置於次級側之矽控整流器或觸發電路容易損壞而致過電壓保護不夠精準。 A high-powered silicon controlled rectifier or trigger circuit is usually disposed on the secondary side of the voltage conversion device (especially the standby voltage conversion device); when an overvoltage occurs on the secondary side, the rectifier rectifier or the trigger circuit is Ground to provide overvoltage protection (protect the secondary side). However, the energy impact of this method is large, which makes the voltage-controlled rectifier or the trigger circuit easy to damage; when the voltage-controlled rectifier or the trigger circuit is damaged, the over-voltage protection will fail. That is to say, the current overvoltage protection has the disadvantage that the overvoltage protection is not accurate due to the easy damage of the controlled rectifier or the trigger circuit provided on the secondary side.
為改善上述習知技術之缺點，本發明之目的在於提供一種過電壓保護電路。 In order to improve the above disadvantages of the prior art, it is an object of the present invention to provide an overvoltage protection circuit.
為達成本發明之上述目的，本發明之過電壓保護電路包含：一輸出端電壓偵測子電路，該輸出端電壓偵測子電路電性連接至電壓轉換裝置之次級側電壓處理電路之電壓輸出端；及一觸發接地子電路，該觸發接地子電路電 性連接至脈波寬度調變控制器。其中當該輸出端電壓偵測子電路偵測電壓輸出端之輸出電壓大於預設電壓時，該輸出端電壓偵測子電路通知該觸發接地子電路輸出電壓大於預設電壓，使得該觸發接地子電路阻止驅動電壓被傳送至脈波寬度調變控制器。 In order to achieve the above object of the present invention, the overvoltage protection circuit of the present invention comprises: an output voltage detection sub-circuit, the output voltage detection sub-circuit is electrically connected to the voltage of the secondary side voltage processing circuit of the voltage conversion device An output terminal; and a trigger ground sub-circuit, the trigger ground sub-circuit Connected to the pulse width modulation controller. When the output voltage detection sub-circuit detects that the output voltage of the voltage output terminal is greater than the preset voltage, the output voltage detection sub-circuit informs the trigger ground sub-circuit that the output voltage is greater than the preset voltage, so that the trigger grounding The circuit prevents the drive voltage from being transmitted to the pulse width modulation controller.
本發明之功效在於改善過電壓保護之精準度。 The effect of the invention is to improve the accuracy of overvoltage protection.
10‧‧‧過電壓保護電路 10‧‧‧Overvoltage protection circuit
20‧‧‧電壓轉換裝置 20‧‧‧Voltage conversion device
30‧‧‧電壓供應裝置 30‧‧‧Voltage supply unit
102‧‧‧輸出端電壓偵測子電路 102‧‧‧Output voltage detection subcircuit
104‧‧‧隔離子電路 104‧‧‧Isolation subcircuit
106‧‧‧觸發接地子電路 106‧‧‧Trigger ground subcircuit
108‧‧‧過電壓通知輔助子電路 108‧‧‧Overvoltage notification auxiliary subcircuit
110‧‧‧墊高電壓 110‧‧‧High voltage
112‧‧‧第一電阻 112‧‧‧First resistance
114‧‧‧光耦合器發送部 114‧‧‧Optocoupler Transmitter
116‧‧‧三端可調分流調節器 116‧‧‧Three-terminal adjustable shunt regulator
118‧‧‧第二電阻 118‧‧‧second resistance
120‧‧‧光耦合器接收部 120‧‧‧Optocoupler Receiver
122‧‧‧第三電阻 122‧‧‧ Third resistor
124‧‧‧第一電容 124‧‧‧first capacitor
126‧‧‧光信號 126‧‧‧Light signal
128‧‧‧矽控整流器 128‧‧‧Controlled rectifier
130‧‧‧第四電阻 130‧‧‧fourth resistor
132‧‧‧第一電晶體 132‧‧‧First transistor
134‧‧‧第五電阻 134‧‧‧ fifth resistor
136‧‧‧第一分壓電阻 136‧‧‧First voltage divider resistor
138‧‧‧第二分壓電阻 138‧‧‧Second voltage divider resistor
140‧‧‧第二電容 140‧‧‧second capacitor
202‧‧‧次級側電壓處理電路 202‧‧‧Secondary side voltage processing circuit
204‧‧‧電壓輸出端 204‧‧‧voltage output
206‧‧‧初級側電壓處理電路 206‧‧‧Primary side voltage processing circuit
208‧‧‧脈波寬度調變控制器 208‧‧‧ Pulse width modulation controller
210‧‧‧輸出電壓 210‧‧‧Output voltage
212‧‧‧驅動電壓 212‧‧‧ drive voltage
214‧‧‧第三電容 214‧‧‧ third capacitor
216‧‧‧第四電容 216‧‧‧fourth capacitor
218‧‧‧第一二極體 218‧‧‧ first diode
220‧‧‧變壓器 220‧‧‧Transformer
222‧‧‧第五電容 222‧‧‧ fifth capacitor
224‧‧‧第二二極體 224‧‧‧second diode
226‧‧‧第二電晶體 226‧‧‧second transistor
228‧‧‧第六電阻 228‧‧‧ sixth resistor
2202‧‧‧變壓器初級側繞組 2202‧‧‧ Transformer primary side winding
2204‧‧‧變壓器次級側繞組 2204‧‧‧Transformer secondary winding
2206‧‧‧變壓器輔助繞組 2206‧‧‧Transformer auxiliary winding
圖1為本發明之過電壓保護電路之方塊圖。 1 is a block diagram of an overvoltage protection circuit of the present invention.
圖2為本發明之過電壓保護電路之電路圖。 2 is a circuit diagram of an overvoltage protection circuit of the present invention.
圖3為本發明之過電壓保護電路之另一實施例方塊圖。 3 is a block diagram of another embodiment of an overvoltage protection circuit of the present invention.
有關本發明的詳細說明及技術內容，請參閱以下的詳細說明和附圖說明如下，而附圖與詳細說明僅作為說明之用，並非用於限制本發明。 The detailed description and the technical description of the present invention are to be understood as the
請參考圖1，其係為本發明之過電壓保護電路之方塊圖。一過電壓保護電路10包含一輸出端電壓偵測子電路102、一隔離子電路104、一觸發接地子電路106及一過電壓通知輔助子電路108。 Please refer to FIG. 1, which is a block diagram of the overvoltage protection circuit of the present invention. An overvoltage protection circuit 10 includes an output voltage detection sub-circuit 102, an isolation sub-circuit 104, a trigger ground sub-circuit 106, and an over-voltage notification auxiliary sub-circuit 108.
該輸出端電壓偵測子電路102電性連接至一電壓轉換裝置20之一次級側電壓處理電路202之一電壓輸出端204；該隔離子電路104電性連接至該輸出端電壓偵測子電路102、該電壓輸出端204及該電壓轉換裝置20之一初級側電壓處理電路206之一脈波寬度調變控制器208；該觸發接地子電路106電性連接至該隔離子電路104及該脈波寬度調變控制器208；該過電壓通知輔助子電路108電 性連接至該輸出端電壓偵測子電路102、該隔離子電路104及該電壓輸出端204。該電壓轉換裝置20連接一電壓供應裝置30。 The output voltage detecting sub-circuit 102 is electrically connected to a voltage output terminal 204 of one of the secondary side voltage processing circuits 202 of the voltage converting device 20; the isolation sub-circuit 104 is electrically connected to the output voltage detecting sub-circuit 102. The voltage output terminal 204 and a pulse width modulation controller 208 of the primary side voltage processing circuit 206 of the voltage conversion device 20; the trigger ground sub-circuit 106 is electrically connected to the isolation sub-circuit 104 and the pulse Wave width modulation controller 208; the overvoltage notification auxiliary sub-circuit 108 is electrically The output voltage detecting sub-circuit 102, the isolation sub-circuit 104 and the voltage output terminal 204 are connected. The voltage conversion device 20 is connected to a voltage supply device 30.
在一第一實施例，當該輸出端電壓偵測子電路102偵測該電壓輸出端204之一輸出電壓210大於一預設電壓時(表示過電壓了)，該輸出端電壓偵測子電路102透過該隔離子電路104通知該觸發接地子電路106該輸出電壓210大於該預設電壓，使得該觸發接地子電路106阻止一驅動電壓212被傳送至該脈波寬度調變控制器208。 In a first embodiment, when the output voltage detecting sub-circuit 102 detects that the output voltage 210 of the voltage output terminal 204 is greater than a predetermined voltage (indicating an overvoltage), the output voltage detecting sub-circuit The transmission sub-circuit 106 is notified by the isolation sub-circuit 104 that the output voltage 210 is greater than the predetermined voltage, so that the trigger ground sub-circuit 106 prevents a driving voltage 212 from being transmitted to the pulse width modulation controller 208.
換言之，當該脈波寬度調變控制器208沒有接收到該驅動電壓212時，該脈波寬度調變控制器208即不工作，使得該初級側電壓處理電路206停止工作以達到過電壓保護。 In other words, when the pulse width modulation controller 208 does not receive the driving voltage 212, the pulse width modulation controller 208 does not operate, so that the primary side voltage processing circuit 206 stops operating to achieve overvoltage protection.
當該輸出端電壓偵測子電路102透過該隔離子電路104通知該觸發接地子電路106該輸出電壓210大於該預設電壓時，該過電壓通知輔助子電路108提供該隔離子電路104一墊高電壓110，使得該輸出端電壓偵測子電路102透過該隔離子電路104加速通知該觸發接地子電路106該輸出電壓210大於該預設電壓。 When the output voltage detecting sub-circuit 102 notifies the triggering ground sub-circuit 106 that the output voltage 210 is greater than the preset voltage, the over-voltage notification auxiliary sub-circuit 108 provides a pad of the isolation sub-circuit 104. The high voltage 110 causes the output voltage detecting sub-circuit 102 to accelerate through the isolation sub-circuit 104 to notify the trigger ground sub-circuit 106 that the output voltage 210 is greater than the preset voltage.
在理論上，該輸出端電壓偵測子電路102有能力透過該隔離子電路104通知該觸發接地子電路106該輸出電壓210大於該預設電壓；然而，由於零件的誤差等等因素，使得該輸出端電壓偵測子電路102透過該隔離子電路104通知該觸發接地子電路106的速度緩慢甚至失效；因此，該過電壓通知輔助子電路108被設置以提供該隔離子電路104該墊高電壓110，使得該輸出端電壓偵測子電路102透過該隔離子電路104加速通知該觸發接地子電路106該輸出電壓210大於該預設電壓。(詳如圖2所示) In theory, the output voltage detecting sub-circuit 102 has the capability to notify the triggering ground sub-circuit 106 that the output voltage 210 is greater than the predetermined voltage through the isolation sub-circuit 104; however, due to factors such as parts errors, etc. The output voltage detecting sub-circuit 102 notifies the triggering ground sub-circuit 106 that the speed of the triggering sub-circuit 106 is slow or even invalid through the isolation sub-circuit 104; therefore, the over-voltage notification auxiliary sub-circuit 108 is configured to provide the isolation sub-circuit 104 with the high voltage. 110, the output voltage detecting sub-circuit 102 is accelerated by the isolation sub-circuit 104 to notify the trigger ground sub-circuit 106 that the output voltage 210 is greater than the preset voltage. (Detailed as shown in Figure 2)
再者，該電壓轉換裝置20還包含一第三電容214、一第四電容216、一第一二極體218、一變壓器220、一第五電容222、一第二二極體224、一 第二電晶體226及一第六電阻228等等元件；該變壓器220包含一變壓器初級側繞組2202、一變壓器次級側繞組2204及一變壓器輔助繞組2206；該電壓轉換裝置20可為例如但本發明不限定為一返馳式(flyback)電壓轉換器；該驅動電壓212可為例如但本發明不限定為來自於該變壓器輔助繞組2206之一輔助電壓。 Furthermore, the voltage conversion device 20 further includes a third capacitor 214, a fourth capacitor 216, a first diode 218, a transformer 220, a fifth capacitor 222, a second diode 224, and a second capacitor 224. The second transistor 226 and a sixth resistor 228 and the like; the transformer 220 includes a transformer primary side winding 2202, a transformer secondary side winding 2204 and a transformer auxiliary winding 2206; the voltage conversion device 20 can be, for example, but The invention is not limited to a flyback voltage converter; the drive voltage 212 can be, for example, but the invention is not limited to one of the auxiliary voltages from the transformer auxiliary winding 2206.
在一第二實施例，上述之該輸出端電壓偵測子電路102亦可透過一非隔離型電路(未示於圖1)通知該觸發接地子電路106該輸出電壓210大於該預設電壓(亦即，該隔離子電路104可以使用非隔離型電路取代)。 In a second embodiment, the output voltage detecting sub-circuit 102 can also notify the trigger grounding sub-circuit 106 that the output voltage 210 is greater than the preset voltage through a non-isolated circuit (not shown in FIG. 1). That is, the isolation sub-circuit 104 can be replaced with a non-isolated type circuit).
在一第三實施例，上述之該輸出端電壓偵測子電路102甚至可不透過該隔離子電路104即直接通知該觸發接地子電路106該輸出電壓210大於該預設電壓(亦即，該過電壓保護電路10可以不必包含該隔離子電路104，如圖3所示)；請參考圖3，其係為本發明之過電壓保護電路之另一實施例方塊圖；圖3所示之元件與圖1所示之元件相同者，為簡潔因素，故於此不再贅述。 In a third embodiment, the output voltage detecting sub-circuit 102 can directly notify the trigger grounding sub-circuit 106 that the output voltage 210 is greater than the predetermined voltage (ie, the The voltage protection circuit 10 does not need to include the isolation sub-circuit 104, as shown in FIG. 3; please refer to FIG. 3, which is a block diagram of another embodiment of the over-voltage protection circuit of the present invention; The components shown in FIG. 1 are the same, and are not conclusive for the sake of brevity.
請參考圖2，其係為本發明之過電壓保護電路之電路圖。圖2所示之元件與圖1所示之元件相同者，為簡潔因素，故於此不再贅述。再者，該隔離子電路104包含一第一電阻112、一光耦合器發送部114、一三端可調分流調節器(three-terminal adjustable shunt regulator)116、一第二電阻118、一光耦合器接收部120、一第三電阻122及一第一電容124。該觸發接地子電路106包含一矽控整流器(silicon controlled rectifier)128。該過電壓通知輔助子電路108包含一第四電阻130、一第一電晶體132及一第五電阻134。該輸出端電壓偵測子電路102包含一第一分壓電阻136、一第二分壓電阻138及一第二電容140。該矽控整流器128亦可以電晶體、金氧半場效電晶體(MOSFET)等等類似元件代替。 Please refer to FIG. 2, which is a circuit diagram of the overvoltage protection circuit of the present invention. The components shown in FIG. 2 are the same as those shown in FIG. 1 and are for brevity and therefore will not be described again. Furthermore, the isolation sub-circuit 104 includes a first resistor 112, an optocoupler transmitting portion 114, a three-terminal adjustable shunt regulator 116, a second resistor 118, and an optical coupling. The receiver 120 is a third resistor 122 and a first capacitor 124. The trigger ground subcircuit 106 includes a silicon controlled rectifier 128. The overvoltage notification auxiliary sub-circuit 108 includes a fourth resistor 130, a first transistor 132, and a fifth resistor 134. The output voltage detecting sub-circuit 102 includes a first voltage dividing resistor 136, a second voltage dividing resistor 138 and a second capacitor 140. The pilot rectifier 128 can also be replaced by a transistor, a metal oxide half field effect transistor (MOSFET) or the like.
該第一電阻112電性連接至該輸出端電壓偵測子電路102、該過電壓通知輔助子電路108及該電壓輸出端204；該光耦合器發送部114電性連接至該第一電阻112及該過電壓通知輔助子電路108；該三端可調分流調節器116電性連 接至該光耦合器發送部114、該輸出端電壓偵測子電路102及該過電壓通知輔助子電路108；該第二電阻118電性連接至該觸發接地子電路106及該脈波寬度調變控制器208；該光耦合器接收部120電性連接至該第二電阻118及該觸發接地子電路106；該第三電阻122電性連接至該光耦合器接收部120及該觸發接地子電路106；該第一電容124電性連接至該光耦合器接收部120、該觸發接地子電路106及該第三電阻122；該矽控整流器128電性連接至該光耦合器接收部120、該第三電阻122、該第一電容124及該脈波寬度調變控制器208；該第四電阻130電性連接至該輸出端電壓偵測子電路102、該隔離子電路104及該電壓輸出端204；該第一電晶體132電性連接至該第四電阻130、該第一電阻112、該光耦合器發送部114、該三端可調分流調節器116及該輸出端電壓偵測子電路102；該第五電阻134電性連接至該第一電阻112、該光耦合器發送部114、該第一電晶體132及該三端可調分流調節器116；該第一分壓電阻136電性連接至該隔離子電路104、該過電壓通知輔助子電路108及該電壓輸出端204；該第二分壓電阻138電性連接至該第一分壓電阻136、該隔離子電路104及該過電壓通知輔助子電路108；該第二電容140電性連接至該第一分壓電阻136、該隔離子電路104、該過電壓通知輔助子電路108及該第二分壓電阻138。 The first resistor 112 is electrically connected to the output voltage detecting sub-circuit 102, the over-voltage notification auxiliary sub-circuit 108 and the voltage output terminal 204. The optical coupler transmitting portion 114 is electrically connected to the first resistor 112. And the overvoltage notification auxiliary sub-circuit 108; the three-terminal adjustable shunt regulator 116 is electrically connected The optocoupler transmitting unit 114, the output voltage detecting sub-circuit 102 and the over-voltage notification auxiliary sub-circuit 108; the second resistor 118 is electrically connected to the trigger ground sub-circuit 106 and the pulse width modulation The controller 208 is electrically connected to the second resistor 118 and the trigger ground sub-circuit 106. The third resistor 122 is electrically connected to the optocoupler receiving portion 120 and the trigger grounding device. The first capacitor 124 is electrically connected to the optocoupler receiving portion 120, the trigger ground sub-circuit 106 and the third resistor 122; the step-controlled rectifier 128 is electrically connected to the optocoupler receiving portion 120, The third resistor 122, the first capacitor 124 and the pulse width modulation controller 208; the fourth resistor 130 is electrically connected to the output voltage detecting sub-circuit 102, the isolation sub-circuit 104 and the voltage output The first transistor 132 is electrically connected to the fourth resistor 130, the first resistor 112, the optocoupler transmitting portion 114, the three-terminal adjustable shunt regulator 116, and the output voltage detector. The circuit 102; the fifth resistor 134 is electrically connected to the first The resistor 112, the optocoupler transmitting portion 114, the first transistor 132, and the three-terminal adjustable shunt regulator 116; the first voltage dividing resistor 136 is electrically connected to the isolation sub-circuit 104, and the over-voltage notification auxiliary The sub-circuit 108 and the voltage output terminal 204; the second voltage dividing resistor 138 is electrically connected to the first voltage dividing resistor 136, the isolation sub-circuit 104 and the over-voltage notification auxiliary sub-circuit 108; the second capacitor 140 is electrically The first voltage dividing resistor 136, the isolation sub-circuit 104, the overvoltage notification auxiliary sub-circuit 108, and the second voltage dividing resistor 138 are connected.
當該輸出端電壓偵測子電路102偵測該電壓輸出端204之該輸出電壓210大於該預設電壓時，該輸出端電壓偵測子電路102觸發導通該三端可調分流調節器116，使得該光耦合器發送部114藉由該第一電阻112所接收之該輸出電壓210導通。當該光耦合器發送部114導通時，該光耦合器發送部114發送一光信號126至該光耦合器接收部120，使得該光耦合器接收部120導通。當該光耦合器接收部120導通時，該矽控整流器128被觸發導通接地，使得該驅動電壓212透過該矽控整流器128接地而不被傳送至脈波寬度調變控制器208。當該光耦合器發送部114導通時，該第一電晶體132導通以提供該墊高電壓110。 When the output voltage detecting sub-circuit 102 detects that the output voltage 210 of the voltage output terminal 204 is greater than the preset voltage, the output voltage detecting sub-circuit 102 triggers the three-terminal adjustable shunt regulator 116 to be turned on. The output voltage 210 received by the optocoupler transmitting unit 114 by the first resistor 112 is turned on. When the optocoupler transmitting unit 114 is turned on, the optocoupler transmitting unit 114 sends an optical signal 126 to the optocoupler receiving unit 120, so that the optocoupler receiving unit 120 is turned on. When the optocoupler receiving portion 120 is turned on, the pilot rectifier 128 is triggered to be grounded such that the driving voltage 212 is grounded through the pilot rectifier 128 without being transmitted to the pulse width modulation controller 208. When the optocoupler transmitting portion 114 is turned on, the first transistor 132 is turned on to provide the pad high voltage 110.
本發明至少包含下列三個特點： The invention includes at least the following three features:
1.該三端可調分流調節器116可以使用運算放大器(operational amplifier)或比較器(comparator)取代；在次級側(該次級側電壓處理電路202)使用該三端可調分流調節器116(或使用運算放大器、比較器)設定過電壓保護啟動點以實現精準的過電壓保護。 1. The three-terminal adjustable shunt regulator 116 can be replaced with an operational amplifier or a comparator; the three-terminal adjustable shunt regulator is used on the secondary side (the secondary side voltage processing circuit 202) 116 (or use an op amp, comparator) to set the overvoltage protection start point for precise overvoltage protection.
2.在初級側(該初級側電壓處理電路206)直接連接使用小功率的該矽控整流器128(或其他觸發電路或觸發元件)直接拉低該變壓器輔助繞組2206的電壓(例如，將該驅動電壓212接地而不送入該脈波寬度調變控制器208)。 2. The primary side (the primary side voltage processing circuit 206) is directly connected to the voltage controlled rectifier winding 128 (or other trigger circuit or trigger element) using a small power to directly pull down the voltage of the transformer auxiliary winding 2206 (eg, the drive Voltage 212 is grounded and not fed to pulse width modulation controller 208).
3.次級側(該輸出端電壓偵測子電路102)透過該隔離子電路104以拉低在不同側(例如初級側或輔助繞組側)的供電電路或積體電路(integrated circuit)的保護功能引腳，以實現過電壓保護自動重啟(auto-recovery)或鎖定保護(latch off)功能。 3. The secondary side (the output voltage detecting sub-circuit 102) is transmitted through the isolation sub-circuit 104 to pull down the protection of the power supply circuit or the integrated circuit on the different side (for example, the primary side or the auxiliary winding side). Function pin for over-voltage protection auto-recovery or latch off function.
本發明之簡略作動流程為：當該輸出端電壓偵測子電路102偵測該電壓輸出端204之該輸出電壓210大於該預設電壓時，該輸出端電壓偵測子電路102觸發導通該三端可調分流調節器116，使得該光耦合器發送部114導通，該第一電晶體132導通以提供該墊高電壓110，該光耦合器發送部114發送該光信號126至該光耦合器接收部120，使得該光耦合器接收部120導通，該矽控整流器128被觸發導通接地，使得該驅動電壓212透過該矽控整流器128接地而不被傳送至脈波寬度調變控制器208，使得該初級側電壓處理電路206停止工作以達到過電壓保護。 The simple operation flow of the present invention is: when the output voltage detecting sub-circuit 102 detects that the output voltage 210 of the voltage output terminal 204 is greater than the preset voltage, the output voltage detecting sub-circuit 102 triggers the third The end adjustable shunt regulator 116 is configured such that the optocoupler transmitting portion 114 is turned on, the first transistor 132 is turned on to provide the padding voltage 110, and the optocoupler transmitting portion 114 transmits the optical signal 126 to the optocoupler The receiving unit 120 is configured to enable the optocoupler receiving portion 120 to be turned on, and the step-up rectifier 128 is triggered to be grounded, so that the driving voltage 212 is grounded through the step-controlled rectifier 128 without being transmitted to the pulse width modulation controller 208. The primary side voltage processing circuit 206 is caused to stop operating to achieve overvoltage protection.
本發明之功效在於改善過電壓保護之精準度。 The effect of the invention is to improve the accuracy of overvoltage protection.
然以上所述者，僅為本發明之較佳實施例，當不能限定本發明實施之範圍，即凡依本發明申請專利範圍所作之均等變化與修飾等，皆應仍屬本發明之專利涵蓋範圍意圖保護之範疇。本發明還可有其它多種實施例，在不背 離本發明精神及其實質的情況下，熟悉本領域的技術人員當可根據本發明作出各種相應的改變和變形，但這些相應的改變和變形都應屬於本發明所附的權利要求的保護範圍。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。 However, the above is only a preferred embodiment of the present invention, and the scope of the present invention is not limited thereto, that is, the equivalent changes and modifications made by the scope of the present invention should still be covered by the patent of the present invention. The scope of the scope is intended to protect. The invention may have other various embodiments, without Various changes and modifications can be made by those skilled in the art in light of the spirit and scope of the invention, and the corresponding changes and modifications are intended to fall within the scope of the appended claims. . 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‧‧‧過電壓保護電路 10‧‧‧Overvoltage protection circuit
20‧‧‧電壓轉換裝置 20‧‧‧Voltage conversion device
30‧‧‧電壓供應裝置 30‧‧‧Voltage supply unit
102‧‧‧輸出端電壓偵測子電路 102‧‧‧Output voltage detection subcircuit
104‧‧‧隔離子電路 104‧‧‧Isolation subcircuit
106‧‧‧觸發接地子電路 106‧‧‧Trigger ground subcircuit
108‧‧‧過電壓通知輔助子電路 108‧‧‧Overvoltage notification auxiliary subcircuit
110‧‧‧墊高電壓 110‧‧‧High voltage
202‧‧‧次級側電壓處理電路 202‧‧‧Secondary side voltage processing circuit
204‧‧‧電壓輸出端 204‧‧‧voltage output
206‧‧‧初級側電壓處理電路 206‧‧‧Primary side voltage processing circuit
208‧‧‧脈波寬度調變控制器 208‧‧‧ Pulse width modulation controller
210‧‧‧輸出電壓 210‧‧‧Output voltage
212‧‧‧驅動電壓 212‧‧‧ drive voltage
214‧‧‧第三電容 214‧‧‧ third capacitor
216‧‧‧第四電容 216‧‧‧fourth capacitor
218‧‧‧第一二極體 218‧‧‧ first diode
220‧‧‧變壓器 220‧‧‧Transformer
222‧‧‧第五電容 222‧‧‧ fifth capacitor
224‧‧‧第二二極體 224‧‧‧second diode
226‧‧‧第二電晶體 226‧‧‧second transistor
228‧‧‧第六電阻 228‧‧‧ sixth resistor
2202‧‧‧變壓器初級側繞組 2202‧‧‧ Transformer primary side winding
2204‧‧‧變壓器次級側繞組 2204‧‧‧Transformer secondary winding
2206‧‧‧變壓器輔助繞組 2206‧‧‧Transformer auxiliary winding
Claims (7)
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| TW105101592A TWI581535B (en) | 2016-01-19 | 2016-01-19 | Over voltage protection circuit |
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| TW201728032A TW201728032A (en) | 2017-08-01 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101212182A (en) * | 2006-12-29 | 2008-07-02 | 群康科技(深圳)有限公司 | Power circuit |
| TWI379181B (en) * | 2008-09-01 | 2012-12-11 | Grenergy Opto Inc | Primary-side feedback control device and method for a power converter |
| TW201336216A (en) * | 2012-02-18 | 2013-09-01 | Richtek Technology Corp | Isolated power converter circuit and control method thereof |
| TWI425754B (en) * | 2010-04-20 | 2014-02-01 | Neoenergy Microelectronics Inc | Flyback converter system and feedback controlling apparatus and method for the same |
| TWI442677B (en) * | 2011-05-30 | 2014-06-21 | Noveltek Semiconductor Corp | Power supply and controller thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101212182A (en) * | 2006-12-29 | 2008-07-02 | 群康科技(深圳)有限公司 | Power circuit |
| TWI379181B (en) * | 2008-09-01 | 2012-12-11 | Grenergy Opto Inc | Primary-side feedback control device and method for a power converter |
| TWI425754B (en) * | 2010-04-20 | 2014-02-01 | Neoenergy Microelectronics Inc | Flyback converter system and feedback controlling apparatus and method for the same |
| TWI442677B (en) * | 2011-05-30 | 2014-06-21 | Noveltek Semiconductor Corp | Power supply and controller thereof |
| TW201336216A (en) * | 2012-02-18 | 2013-09-01 | Richtek Technology Corp | Isolated power converter circuit and control method thereof |
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