TW201702783A - Compensation method of voltage output adjusted from loading changes and its compensation circuit for stabilizing voltage output passing through a power supply within a certain loading range - Google Patents
Compensation method of voltage output adjusted from loading changes and its compensation circuit for stabilizing voltage output passing through a power supply within a certain loading range Download PDFInfo
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本發明係關於一種補償方法及其補償電路，更特別的是關於一種隨負載變化而調整輸出電壓的補償方法及其補償電路。The present invention relates to a compensation method and a compensation circuit thereof, and more particularly to a compensation method for adjusting an output voltage with a load change and a compensation circuit thereof.
現今的電子產品隨著科技的發展，朝向輕量化與多功能化的各種可攜式行動裝置諸如：智慧型手機、平板電腦等裝置，係廣泛地被使用於人們的工作、學習與生活中。With the development of technology, today's electronic products are widely used in people's work, study and life for various portable mobile devices such as smart phones and tablet computers that are lighter and more multifunctional.
這些廣泛被使用的電子產品在充電時，皆是需要一電源供應線來使該電子產品與充電器進行電性連接，以供該充電器提供充電電源至該電子產品。此外，即便是應用無線充電技術，用來置放電子產品的無線充電座與其變壓器之間仍是具有該電源供應線。When these widely used electronic products are charged, a power supply line is needed to electrically connect the electronic product to the charger for the charger to provide charging power to the electronic product. In addition, even with the application of wireless charging technology, the power supply line is still provided between the wireless charging stand for placing electronic products and its transformer.
該電源供應線係連接至該充電器或變壓器內的一開關電源電路，以傳遞該開關電源電路所輸出的充電電源，也因此，由於電源供應線上之寄生電阻的存在，往往導致傳遞至電子產品的輸入電壓會低於開關電源電路的輸出電壓，從而延長了電子產品的充電時間，在使用上造成了諸多不便。再者，當負載(電子產品)越來越大時，電源供應線導致之壓降所造成的影響就更趨明顯；換言之，倘若用在供應電子產品的運作而非充電時，將可能導致電子產品運作不正常甚至造成資料讀取錯誤、資料寫入不完全而毀損等的問題。The power supply line is connected to a switching power supply circuit in the charger or the transformer to transmit the charging power output by the switching power supply circuit, and therefore, due to the existence of parasitic resistance on the power supply line, the transmission to the electronic product is often caused. The input voltage is lower than the output voltage of the switching power supply circuit, thereby prolonging the charging time of the electronic product, causing inconvenience in use. Moreover, when the load (electronics) is getting larger and larger, the impact caused by the voltage drop caused by the power supply line becomes more obvious; in other words, if it is used in the operation of supplying electronic products instead of charging, it may lead to electronics. The product is not functioning properly or even causes errors in data reading, incomplete data writing, and damage.
本發明之一目的在於對電流在電源供應線之線材上的電壓降進行補償。One of the objects of the present invention is to compensate for the voltage drop of current on the wires of the power supply line.
本發明之另一目的在於對應不同負載大小的情況，可施加不同程度的補償。Another object of the invention is to apply different degrees of compensation to different load sizes.
為達上述目的及其他目的，本發明提出一種隨負載變化而調整輸出電壓的補償方法，係對一電源供應裝置之輸出端的一輸出電壓進行補償，以供與該電源供應裝置之輸出端耦接的一電源供應線將補償後的輸出電壓輸送至一負載，該方法包含：取得用以回應該負載之電流需求的一電壓偵測訊號；將該電壓偵測訊號之電壓位準轉換為一第一電流；以預設的一第二電流對該第一電流進行抵銷；將抵銷後的剩餘電流透過一電流鏡電路產生映射的一補償電流；及將該補償電流提供至耦接該直流轉直流轉換器之輸出端的一分壓電阻控制電路，以於該電源供應裝置之輸出端施加一補償電壓而對該輸出電壓進行補償，其中，預設的該第二電流係定義為是否進行補償的門檻值，當回應該負載的該電壓偵測訊號升高而致使該第一電流大於該第二電流時始施加該補償電壓。To achieve the above and other objects, the present invention provides a compensation method for adjusting an output voltage as a function of load, compensating for an output voltage at an output of a power supply device for coupling to an output of the power supply device a power supply line delivers the compensated output voltage to a load, the method comprising: obtaining a voltage detection signal for responding to the current demand of the load; converting the voltage level of the voltage detection signal to a first a current; canceling the first current by a predetermined second current; passing the offset residual current through a current mirror circuit to generate a compensated current; and providing the compensation current to the DC A voltage dividing resistor control circuit at the output end of the DC-DC converter compensates the output voltage by applying a compensation voltage to the output end of the power supply device, wherein the preset second current system is defined as whether to compensate Threshold value, when the voltage detection signal of the load should be raised to cause the first current to be greater than the second current, the compensation voltage is applied
於本發明的一實施例中，該電壓偵測訊號的取得係取自該電源供應裝置內之一直流轉直流轉換器的電流感測電路。In an embodiment of the invention, the voltage detection signal is obtained from a current sensing circuit of a DC to DC converter in the power supply device.
為達上述目的及其他目的，本發明復提出一種隨負載變化而調整輸出電壓的補償電路，係對一電源供應裝置之輸出端的一輸出電壓進行補償，以供與該電源供應裝置之輸出端耦接的一電源供應線將補償後的輸出電壓輸送至一負載，該補償電路包含：一輸入端，係耦接該電源供應裝置以接收回應該負載之電流需求的一電壓偵測訊號；一電壓隨耦器，係根據該電壓偵測訊號於後級產生響應的一電壓隨耦訊號；一電壓轉電流電路，係耦接該電壓隨耦器，以將該電壓隨耦訊號之電壓位準轉換為一第一電流；一補償啟動電路，係耦接該電壓轉電流電路，以產生對該第一電流進行抵銷之預設的一第二電流；一電流鏡電路，係耦接該電壓轉電流電路及該補償啟動電路，係根據抵銷後的剩餘電流於輸出側產生映射的一補償電流；及一分壓電阻控制電路，係耦接該電流鏡電路的輸出側及該電源供應裝置之輸出端，係根據該補償電流對應產生一補償電壓，以於該電源供應裝置之輸出端施加該補償電壓而對該輸出電壓進行補償，其中，預設的該第二電流係定義為是否進行補償的門檻值，當回應該負載的該電壓偵測訊號升高而致使該第一電流大於該第二電流時始施加該補償電壓。To achieve the above and other objects, the present invention provides a compensation circuit for adjusting an output voltage as a function of load, compensating for an output voltage at an output of a power supply device for coupling with an output of the power supply device Connected to a power supply line to deliver the compensated output voltage to a load, the compensation circuit includes: an input end coupled to the power supply device to receive a voltage detection signal corresponding to the current demand of the load; The follower is a voltage-dependent signal that is generated according to the voltage detection signal in the subsequent stage; a voltage-to-current circuit is coupled to the voltage follower to convert the voltage with the voltage level of the coupled signal a first current; a compensation starting circuit coupled to the voltage-to-current circuit to generate a predetermined second current that cancels the first current; a current mirror circuit coupled to the voltage The current circuit and the compensation starting circuit generate a compensation current on the output side according to the residual current after the offset; and a voltage dividing resistor control circuit is coupled to the current The output side of the mirror circuit and the output end of the power supply device generate a compensation voltage according to the compensation current, and the compensation voltage is applied to the output end of the power supply device to compensate the output voltage. The second current is defined as a threshold value for whether to compensate, and the compensation voltage is applied when the voltage detection signal of the load is raised to cause the first current to be greater than the second current.
於本發明的一實施例中，補償電路更包含一取樣電路，係耦接於該輸入端及該電壓隨耦器間，係在取得該電壓偵測訊號後，藉由預設取樣頻率來分段地取樣，使得供轉換為該第一電流的電壓位準係逐步接近該電壓偵測訊號的原始電壓位準。其中，該取樣電路可包含一開關單元、一取樣電阻單元及一取樣電容單元，該開關單元係耦接於該輸入端及串接的該取樣電阻單元與該取樣電容單元之間，該開關單元根據一取樣訊號使該電壓偵測訊號間斷地輸送至該取樣電阻單元。In an embodiment of the invention, the compensation circuit further includes a sampling circuit coupled between the input terminal and the voltage follower, after the voltage detection signal is obtained, by using a preset sampling frequency. The segment is sampled such that the voltage level for conversion to the first current is gradually approaching the original voltage level of the voltage detection signal. The sampling circuit can include a switching unit, a sampling resistor unit, and a sampling capacitor unit. The switching unit is coupled between the input terminal and the series connected sampling resistor unit and the sampling capacitor unit. The voltage detection signal is intermittently delivered to the sampling resistor unit according to a sampling signal.
於本發明的一實施例中，該電壓轉電流電路係包含一場效電晶體及一補償電阻單元，該場效電晶體係耦接該電壓隨耦器以根據所接收之電壓位準控制施加於該補償電阻單元的電壓位準，藉由施加於該補償電阻單元之電壓位準轉換出該第一電流。In an embodiment of the invention, the voltage-to-current circuit includes a field effect transistor and a compensation resistor unit, and the field effect transistor system is coupled to the voltage follower to apply to the voltage level control according to the received voltage level. The voltage level of the compensation resistor unit is converted to the first current by a voltage level applied to the compensation resistor unit.
本發明之再一目的在於使補償的速度可被穩定地調控。A further object of the invention is to enable the speed of compensation to be stably regulated.
為達上述目的及其他目的，於本發明的一實施例中，在取得該電壓偵測訊號後，該電壓偵測訊號係藉由預設取樣頻率來分段地被取樣，而使得供轉換為該第一電流的電壓位準係逐步接近該電壓偵測訊號的原始電壓位準。In one embodiment of the present invention, after the voltage detection signal is obtained, the voltage detection signal is sampled in stages by a preset sampling frequency, so that the conversion is performed as The voltage level of the first current is gradually approaching the original voltage level of the voltage detection signal.
藉此，基於負載越大，電壓供應不足造成的影響就越大，本發明透過負載需求越大時，電源供應器之電流輸出量會隨之提高的響應關係，再利用電壓與電流間的轉換關係，以預設的第二電流來定義出進行電壓補償的時機，進而可正確響應出適當的補償電壓，使得通過電源供應線之後的輸出電壓可在負載的額定範圍內達到恒定的效果。Therefore, the greater the load, the greater the impact of insufficient voltage supply. When the load demand of the present invention is larger, the current output of the power supply will increase the response relationship, and the conversion between voltage and current will be utilized. The relationship defines a timing for voltage compensation by a preset second current, and thus correctly responds to an appropriate compensation voltage, so that the output voltage after passing through the power supply line can achieve a constant effect within the rated range of the load.
為充分瞭解本發明之目的、特徵及功效，茲藉由下述具體之實施例，並配合所附之圖式，對本發明做一詳細說明，說明如後：In order to fully understand the objects, features and advantages of the present invention, the present invention will be described in detail by the following specific embodiments and the accompanying drawings.
首先請參閱圖1，係為本發明一實施例中之電壓補償的電路示意圖。傳統上，電源供應裝置100係於接收電源輸入P後，經過整流濾波器110、直流轉直流轉換器120後在輸出端130連接至一電源供應線300，以將電壓輸送至一負載400。本發明之補償電路400係藉由截取電源供應器100內響應輸出電流大小的電壓偵測訊號COMP來做為目前負載300之電流需求狀況的評估指標，再根據補償電路400內預設之門檻值來判定是否進行電壓補償。由於直流轉直流轉換器120具有電流感側電路，故可用來響應目前負載300的電流需求狀況。然而，圖1所示之整流濾波器110及直流轉直流轉換器120僅為一種示例，任何可偵測電源供應裝置100之輸出電流的裝置或設計皆可用來提供予補償電路400作為目前負載300之電流需求狀況的評估指標，本發明並不以圖1之直流轉直流轉換器120為限。Referring first to FIG. 1, a circuit diagram of voltage compensation in an embodiment of the present invention is shown. Conventionally, the power supply device 100 is connected to a power supply line 300 at the output terminal 130 after passing through the rectification filter 110 and the DC to DC converter 120 after receiving the power input P to deliver the voltage to a load 400. The compensation circuit 400 of the present invention is used as an evaluation index of the current demand condition of the current load 300 by intercepting the voltage detection signal COMP in the power supply 100 in response to the output current, and then according to the preset threshold value in the compensation circuit 400. To determine whether to perform voltage compensation. Since the DC-to-DC converter 120 has a current sense side circuit, it can be used to respond to current current demand conditions of the load 300. However, the rectification filter 110 and the DC-to-DC converter 120 shown in FIG. 1 are merely examples. Any device or design that can detect the output current of the power supply device 100 can be used to provide the pre-compensation circuit 400 as the current load 300. The evaluation index of the current demand condition, the present invention is not limited to the DC to DC converter 120 of FIG.
接著請參閱圖2，係為本發明一實施例中之電壓補償的方法流程圖。本發明一實施例中之電壓補償的方法包含： 步驟S1：取得電壓偵測訊號步驟，係取得用以回應該負載之電流需求的一電壓偵測訊號； 步驟S2：電壓轉電流步驟，係將該電壓偵測訊號之電壓位準轉換為一第一電流； 步驟S3：電流抵銷步驟，係以預設的一第二電流對該第一電流進行抵銷； 步驟S4：補償電流產生步驟，係將抵銷後的剩餘電流透過一電流鏡電路產生映射的一補償電流； 步驟S5：補償電壓產生步驟，係將該補償電流提供至耦接該直流轉直流轉換器之輸出端的一分壓電阻控制電路，以於該電源供應裝置之輸出端施加一補償電壓而對該輸出電壓進行補償。2 is a flow chart of a method for voltage compensation in an embodiment of the present invention. The method for voltage compensation in an embodiment of the present invention includes: Step S1: obtaining a voltage detection signal step, obtaining a voltage detection signal for returning current demand of the load; Step S2: voltage to current step, The voltage level of the voltage detecting signal is converted into a first current; Step S3: the current canceling step is to offset the first current by a preset second current; Step S4: Compensating the current generating step, The residual current after the offset is generated by a current mirror circuit to generate a compensated current; step S5: the compensation voltage generating step is to provide the compensation current to a voltage dividing resistor coupled to the output end of the DC to DC converter The control circuit compensates the output voltage by applying a compensation voltage to the output of the power supply device.
上述的方法中，預設的該第二電流係定義為是否進行補償的門檻值，當回應該負載的該電壓偵測訊號升高而致使該第一電流大於該第二電流時始施加該補償電壓。In the above method, the preset second current system is defined as a threshold value for whether to compensate, and the compensation is applied when the voltage detection signal corresponding to the load rises and the first current is greater than the second current. Voltage.
此外，於步驟S2之電壓轉電流步驟中，在取得該電壓偵測訊號後，該電壓偵測訊號更可藉由預設取樣頻率來分段地被取樣，使得供轉換為該第一電流的電壓位準係逐步接近該電壓偵測訊號的原始電壓位準，進而使補償的速度可被穩定地調控。In addition, in the voltage-to-current step of step S2, after the voltage detection signal is obtained, the voltage detection signal can be sampled in sections by a preset sampling frequency, so as to be converted into the first current. The voltage level is gradually approached to the original voltage level of the voltage detection signal, so that the speed of compensation can be stably regulated.
接著請參閱圖3，係本發明一實施例中之電壓補償的電路方塊圖。本發明隨負載變化而調整輸出電壓的補償電路包含：一輸入端410、一電壓隨耦器430、一電壓轉電流電路450、一補償啟動電路470、一電流鏡電路480及一分壓電阻控制電路490。3 is a block diagram of a voltage compensation circuit in an embodiment of the present invention. The compensation circuit for adjusting the output voltage according to the load change comprises: an input terminal 410, a voltage follower 430, a voltage-to-current circuit 450, a compensation starting circuit 470, a current mirror circuit 480 and a voltage dividing resistor control. Circuit 490.
圖4係本發明另一實施例中之電壓補償的電路方塊圖，相較於圖3的實施例係更包含一取樣電路420，該取樣電路420係耦接於該輸入端410及該電壓隨耦器430間。4 is a circuit block diagram of a voltage compensation in another embodiment of the present invention. The embodiment of FIG. 3 further includes a sampling circuit 420 coupled to the input terminal 410 and the voltage Coupler 430.
接著請同時參閱圖4及圖5，圖5係為圖4之一具體實施例下的電路圖。輸入端410係耦接圖1所示之電源供應裝置100，用來接收回應負載300之電流需求的一電壓偵測訊號COMP。電壓隨耦器430係根據該電壓偵測訊號COMP，在後級電路產生響應該電壓偵測訊號COMP的一電壓隨耦訊號，電壓隨耦器430由於具有高輸入阻抗以隔絕前後級的影響，因此於此可作為緩衝器用。其中，在圖5係以VSEN_CABLE_IN表示為電壓隨耦器430的正相輸入，此外，圖5係以一OP放大器作為示例，作為緩衝器之用途下，VSEN_CABLE_IN是什麼電壓，OP放大器的輸出端就會出現對應的電壓，藉此電壓來轉換為後續的電流。Please refer to FIG. 4 and FIG. 5 at the same time. FIG. 5 is a circuit diagram of a specific embodiment of FIG. The input terminal 410 is coupled to the power supply device 100 shown in FIG. 1 for receiving a voltage detection signal COMP that responds to the current demand of the load 300. The voltage follower 430 generates a voltage dependent signal in response to the voltage detection signal COMP in the subsequent stage circuit according to the voltage detection signal COMP. The voltage follower 430 has a high input impedance to isolate the influence of the front and rear stages. Therefore, it can be used as a buffer. 5 is represented by VSEN_CABLE_IN as the positive phase input of the voltage follower 430. In addition, FIG. 5 is an example of an OP amplifier. As a buffer, what voltage is VSEN_CABLE_IN, and the output of the OP amplifier is A corresponding voltage will appear, which is converted to a subsequent current by the voltage.
電壓轉電流電路450係耦接該電壓隨耦器430，以將該電壓隨耦訊號之電壓位準轉換為一第一電流，該電壓轉電流電路450即是作為電壓/電流的轉換，且隨著該電壓隨耦訊號越大(即電壓位準越高)，轉換出的電流就越大。圖5係以一為示例，該電壓轉電流電路450包含一場效電晶體MNOUT及一補償電阻單元RCA1，該場效電晶體MNOUT係耦接該電壓隨耦器430以根據所接收之電壓位準(由OP放大器所輸出)控制施加於該補償電阻單元RCA1的電壓位準，藉由施加於該補償電阻單元RCA1之電壓位準轉換出該第一電流。換言之，OP放大器的輸出電壓經過一個場效電晶體MNOUT之後且於扣除場效電晶體MNOUT本身的Vth後，即可產生施加於該補償電阻單元RCA1的電壓位準，進而轉換出該第一電流。The voltage-to-current circuit 450 is coupled to the voltage follower 430 to convert the voltage to a first current according to the voltage level of the coupling signal, and the voltage-to-current circuit 450 is converted as a voltage/current, and The larger the voltage dependent signal (ie, the higher the voltage level), the greater the converted current. 5 is an example, the voltage-to-current circuit 450 includes a field effect transistor MNOUT and a compensation resistor unit RCA1 coupled to the voltage follower 430 to receive the voltage level according to (output by the OP amplifier) controls the voltage level applied to the compensation resistor unit RCA1, and the first current is converted by the voltage level applied to the compensation resistor unit RCA1. In other words, after the output voltage of the OP amplifier passes through a field effect transistor MNOUT and after subtracting the Vth of the field effect transistor MNOUT itself, the voltage level applied to the compensation resistor unit RCA1 is generated, and the first current is converted. .
補償啟動電路470耦接該電壓轉電流電路450，係產生對該第一電流進行抵銷之預設的一第二電流，此電流的產生可由任何可產生電流流量的電路來配置，本發明於此不再贅述。本發明係藉由外加的此電流之大小來定義為是否進行補償的門檻值。根據第二電流的大小，追溯至前級電路中的電壓偵測訊號COMP，一旦有設定該第二電流的一電流值，即可對應該電壓偵測訊號COMP的一門檻電壓值，當該電壓偵測訊號COMP的電壓值超過該門檻電壓值時，即代表該第二電流無法抵銷該第一電流，此時，剩餘的電流即可進行後續的電流鏡映射。The compensation start circuit 470 is coupled to the voltage-to-current circuit 450 to generate a preset second current that cancels the first current. The generation of the current can be configured by any circuit that can generate a current flow. This will not be repeated here. The present invention defines the threshold value for whether or not to compensate by the magnitude of this applied current. According to the magnitude of the second current, the voltage detection signal COMP traced back to the pre-stage circuit, and once a current value of the second current is set, a threshold value of the voltage detection signal COMP can be corresponding to the voltage. When the voltage value of the detection signal COMP exceeds the threshold voltage value, it means that the second current cannot cancel the first current. At this time, the remaining current can perform subsequent current mirror mapping.
電流鏡電路480係耦接該電壓轉電流電路450及該補償啟動電路470，以於輸入側接收該電壓轉電流電路450與該補償啟動電路470協同作用下所剩餘的電流。據此，電流鏡電路480根據抵銷後的剩餘電流係於輸出側產生映射的一補償電流。電流鏡電路舉例來說可包括：第一及第二的兩開關，用以形成電流鏡，其係根據耦接至第一開關的汲極的電流源而在第二開關的汲極處產生映射的鏡電流來做為該補償電流。The current mirror circuit 480 is coupled to the voltage-to-current circuit 450 and the compensation starting circuit 470 to receive the current remaining by the voltage-to-current circuit 450 in cooperation with the compensation starting circuit 470 on the input side. Accordingly, the current mirror circuit 480 generates a mapped compensation current based on the residual current after the offset on the output side. The current mirror circuit can include, for example, first and second switches for forming a current mirror that generates a map at the drain of the second switch based on a current source coupled to the drain of the first switch. The mirror current is used as the compensation current.
分壓電阻控制電路490係耦接該電流鏡電路480的輸出側及該電源供應裝置100(參閱圖1)之輸出端，該分壓電阻控制電路490包含分壓電阻單元491及補償電流控制單元492，在該補償電流控制單元492中之第一電晶體492a與第二電晶體492b的作用下，該補償電流IREF 決定該補償電流控制單元492中的控制電壓VGS ，而該控制電壓VGS 在該第二電晶體492b作用下係決定該分壓電阻單元491所流經的電流Ｉo 大小，進而可使該分壓電阻單元491對應地產生一補償電壓。所產生的該補償電壓即係於該電源供應裝置100之輸出端產生與原輸出電壓疊加的效果，進而可進行電壓的補償。其中，第一電晶體492a與第二電晶體492b之閘極相互耦接且更耦接至第一電晶體492a之汲極，第一電晶體492a與第二電晶體492b之源極係耦接至接地點，第二電晶體492b之汲極係耦接該分壓電阻單元491。該第一電晶體492a與該第二電晶體492b以圖5之實施例來說係為n通道的電晶體，此外，該場效電晶體MNOUT亦為n通道的電晶體，該電流鏡電路480中則是包含兩個閘極相耦接的p通道電晶體。The voltage dividing resistor control circuit 490 is coupled to the output side of the current mirror circuit 480 and the output end of the power supply device 100 (see FIG. 1 ). The voltage dividing resistor control circuit 490 includes a voltage dividing resistor unit 491 and a compensation current control unit. 492. Under the action of the first transistor 492a and the second transistor 492b in the compensation current control unit 492, the compensation current I REF determines the control voltage V GS in the compensation current control unit 492, and the control voltage V GS-line determination of the voltage dividing resistor unit 491 flows current magnitude I o at the second electrical 492b crystal effect, and further allows the voltage dividing resistor unit 491 correspondingly generates a compensation voltage. The generated compensation voltage is an effect of superimposing the original output voltage on the output end of the power supply device 100, thereby compensating for the voltage. The gates of the first transistor 492a and the second transistor 492b are coupled to each other and further coupled to the drain of the first transistor 492a, and the first transistor 492a is coupled to the source of the second transistor 492b. To the grounding point, the drain of the second transistor 492b is coupled to the voltage dividing resistor unit 491. The first transistor 492a and the second transistor 492b are n-channel transistors in the embodiment of FIG. 5. In addition, the field effect transistor MNOUT is also an n-channel transistor, and the current mirror circuit 480 The middle is a p-channel transistor with two gates coupled.
此外，本發明的另一實施例(可參閱圖4)中更包含的該取樣電路420，於圖5中係以一電晶體開關搭配一RC電路(電阻與電容的搭配)來形成，藉由預設的取樣訊號CABLE_SEN來控制該電晶體開關，使該電壓偵測訊號被預設的取樣頻率來分段地被取樣，並進而在RC電路下使得供轉換為該第一電流的電壓位準係逐步接近該電壓偵測訊號的原始電壓位準，可參閱第6圖來進一步了解電壓隨耦器的正相輸入電壓VSEN_CABLE_IN隨著取樣訊號CABLE_SEN的控制來逐步接近電壓偵測訊號COMP，其中訊號CLK為直流轉直流轉換器的輸出頻率(使電壓偵測訊號COMP的反應較快)。In addition, the sampling circuit 420 further included in another embodiment of the present invention (refer to FIG. 4) is formed by using a transistor switch and an RC circuit (a combination of a resistor and a capacitor) in FIG. The preset sampling signal CABLE_SEN controls the transistor switch to cause the voltage detection signal to be sampled in stages by a preset sampling frequency, and further to convert the voltage level for the first current under the RC circuit. The system gradually approaches the original voltage level of the voltage detection signal. Refer to FIG. 6 to further understand that the positive-phase input voltage VSEN_CABLE_IN of the voltage follower is gradually approached by the voltage detection signal COMP with the control of the sampling signal CABLE_SEN, where the signal CLK is the output frequency of the DC to DC converter (so that the voltage detection signal COMP reacts faster).
本發明係藉由負載需求越大時，電源供應器之電流輸出量會隨之提高的相關聯之關係，再利用電壓與電流間的轉換關係，以預設的第二電流來定義出進行電壓補償的時機，以正確響應出適當的補償電壓而使通過電源供應線之後的輸出電壓可被穩定在負載的額定範圍內，進而達到恒定的效果。本發明所述的電路區塊之間亦可被連接或加入其他元件，亦即，本發明亦可被以不同的電路結構來達成本案的精神，圖5的各電子元件僅為一種示例並非用來限制本發明。The invention is based on the relationship that the current output of the power supply is increased when the load demand is larger, and the conversion relationship between the voltage and the current is utilized, and the voltage is defined by the preset second current. The timing of the compensation, in order to properly respond to the appropriate compensation voltage, allows the output voltage after passing through the power supply line to be stabilized within the rated range of the load, thereby achieving a constant effect. The circuit blocks of the present invention may also be connected or added with other components. That is, the present invention may also be implemented in different circuit configurations to achieve the spirit of the present invention. The electronic components of FIG. 5 are merely examples and are not used. To limit the invention.
本發明在上文中已以較佳實施例揭露，然熟習本項技術者應理解的是，該實施例僅用於描繪本發明，而不應解讀為限制本發明之範圍。應注意的是，舉凡與該實施例等效之變化與置換，均應設為涵蓋於本發明之範疇內。因此，本發明之保護範圍當以申請專利範圍所界定者為準。The invention has been described above in terms of the preferred embodiments, and it should be understood by those skilled in the art that the present invention is not intended to limit the scope of the invention. It should be noted that variations and permutations equivalent to those of the embodiments are intended to be included within the scope of the present invention. Therefore, the scope of protection of the present invention is defined by the scope of the patent application.
100‧‧‧電源供應裝置
110‧‧‧整流濾波器
120‧‧‧直流轉直流轉換器(DC-DC轉換器)
130‧‧‧輸出端
200‧‧‧電源供應線
300‧‧‧負載
400‧‧‧補償電路
410‧‧‧輸入端
420‧‧‧取樣電路
430‧‧‧電壓隨耦器
450‧‧‧電壓轉電流電路
470‧‧‧補償啟動電路
480‧‧‧電流鏡電路
490‧‧‧分壓電阻控制電路
491‧‧‧分壓電阻單元
492‧‧‧補償電流控制單元
492a‧‧‧第一電晶體
492b‧‧‧第二電晶體
COMP‧‧‧電壓偵測訊號
P‧‧‧電源輸入
CABLE_SEN‧‧‧取樣訊號
CLK‧‧‧訊號之頻率
VSEN_CABLE_IN‧‧‧電壓隨耦器的正相輸入電壓
VGS‧‧‧控制電壓
Ｉo‧‧‧電流
IREF‧‧‧補償電流
MNOUT‧‧‧場效電晶體
RCA1‧‧‧補償電阻單元
S1~S5‧‧‧步驟100‧‧‧Power supply unit
110‧‧‧Rectifier filter
120‧‧‧DC to DC Converter (DC-DC Converter)
130‧‧‧ Output
200‧‧‧Power supply line
300‧‧‧load
400‧‧‧Compensation circuit
410‧‧‧ input
420‧‧‧Sampling circuit
430‧‧‧Voltage follower
450‧‧‧voltage to current circuit
470‧‧‧Compensation start circuit
480‧‧‧current mirror circuit
490‧‧‧Dividing resistor control circuit
491‧‧‧Voltage resistor unit
492‧‧‧Compensation current control unit
492a‧‧‧First transistor
492b‧‧‧second transistor
COMP‧‧‧ voltage detection signal
P‧‧‧Power input
CABLE_SEN‧‧‧Sampling signal
Frequency of CLK‧‧‧ signals
VSEN_CABLE_IN‧‧‧Variable phase input voltage of the voltage follower
V GS ‧‧‧Control voltage I o ‧‧‧current
I REF ‧‧‧Compensation current
MNOUT‧‧‧ field effect transistor
RCA1‧‧‧Compensated resistance unit
S1~S5‧‧‧Steps
［圖1］係為本發明一實施例中之電壓補償的電路示意圖。 ［圖2］係為本發明一實施例中之電壓補償的方法流程圖。 ［圖3］係為本發明一實施例中之電壓補償的電路方塊圖。 ［圖4］係為本發明另一實施例中之電壓補償的電路方塊圖。 ［圖5］係為圖4之一具體實施例下的電路圖。 ［圖6］係為本發明之取樣電路運作時的脈波訊號圖。1 is a circuit diagram of voltage compensation in an embodiment of the present invention. 2 is a flow chart of a method for voltage compensation in an embodiment of the present invention. FIG. 3 is a circuit block diagram of voltage compensation in an embodiment of the present invention. 4 is a circuit block diagram of voltage compensation in another embodiment of the present invention. FIG. 5 is a circuit diagram of a specific embodiment of FIG. 4. FIG. FIG. 6 is a pulse wave signal diagram of the sampling circuit of the present invention.
S1~S5‧‧‧步驟 S1~S5‧‧‧Steps
Claims (7)
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