TWI404353B - Optical network unit - Google Patents
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Description
本發明關於光纖通信網路中的光接收模組,特別是,關於電力中斷的時候依然可以進行信號傳輸的光接收模組。The present invention relates to an optical receiving module in an optical fiber communication network, and more particularly to an optical receiving module capable of performing signal transmission when power is interrupted.
隨著網際網路的快速發展,對於頻寬的要求愈來愈高。此外,有線電視的服務也愈來愈多樣化,其對頻寬的要求也愈來愈高。因此,光纖通信網路成為發展寬頻通信的趨勢。例如光纖到家或光纖到建築物等光纖到點之發展是光纖通信網路發展的目標,以逐步取代原有的銅線傳輸。With the rapid development of the Internet, the requirements for bandwidth are getting higher and higher. In addition, cable TV services are becoming more diverse, and their bandwidth requirements are becoming higher and higher. Therefore, optical fiber communication networks have become the trend of developing broadband communications. For example, fiber-to-the-home or fiber-to-building fiber-to-point development is the goal of fiber-optic communication networks to gradually replace the original copper transmission.
在例如有線電視廣播系統等光纖通信網路中,光纖到戶(FTTH)網路成為主流,在光纖到戶系統中,局端將廣播電視信號轉換為光信號,利用光纜將光信號傳送到使用者端,然後由光接收模組將光信號再轉換為電信號,最後此電信號將被輸入到視訊接收設備。In a fiber-optic communication network such as a cable television broadcasting system, a fiber-to-the-home (FTTH) network becomes the mainstream. In a fiber-to-the-home system, a central office converts a broadcast television signal into an optical signal, and transmits the optical signal to the optical cable. Then, the optical signal is reconverted into an electrical signal by the light receiving module, and finally the electrical signal is input to the video receiving device.
在光纖網路中,視訊光接收模組(Video Optical Unit)是主要的視訊接收裝置。光接收模組在正常情況下(有電時),可以提供豐富的視訊服務,但是,假使在因為地震、颶風、洪水等自然災害或是供電設備故障等因素而停電的時候,將無法操作,以致於無法提供資訊傳輸。In the optical network, the Video Optical Unit is the main video receiving device. The light receiving module can provide rich video services under normal conditions (when there is power), but it will not operate if there is a power outage due to natural disasters such as earthquakes, hurricanes, floods, or power supply equipment failures. It is impossible to provide information transmission.
圖1顯示根據先前技術的一實施例之光接收模組100。光接收模組100包含光電二極體102,匹配電路104、多個放大器106_1、106_2、106_3及自動增益控制電路108組成的後級電路110。當電源(VCC)經由電阻(R)對光電二極體102施加反向電壓,而光電二極體102接收到一定強度的光信號並將其轉換為相應強度的電信號,此電信號包含射頻信號。經過轉換的電信號會經由匹配電路104而輸出至多個放大器106與自動增益控制電路108組成的後級電路,匹配電路104可以使光電二極體102與後級電路的阻抗相匹配以使電信號能由後級電路處理。後級電路對光電二極體102輸出的電信號做放大,增益控制,濾波等處理,最後輸出。FIG. 1 shows a light receiving module 100 in accordance with an embodiment of the prior art. The light receiving module 100 includes a photodiode 102, a matching circuit 104, a plurality of amplifiers 106_1, 106_2, 106_3, and a subsequent stage circuit 110 composed of an automatic gain control circuit 108. When the power source (VCC) applies a reverse voltage to the photodiode 102 via the resistor (R), the photodiode 102 receives a certain intensity of the optical signal and converts it into an electrical signal of a corresponding intensity, the electrical signal including the radio frequency signal. The converted electrical signal is output to the subsequent stage circuit composed of the plurality of amplifiers 106 and the automatic gain control circuit 108 via the matching circuit 104. The matching circuit 104 can match the impedance of the photodiode 102 to the subsequent stage circuit to make the electrical signal. Can be processed by the latter circuit. The latter circuit performs amplification, gain control, filtering, etc. on the electrical signals output from the photodiode 102, and finally outputs.
但是,當外部供電中斷而無逆向電壓VCC 施加至光電二極體102時,則驅動光電二極體102的電路迴路消失,光電二極體102也因而無法產生光感應電流。此外,後級電路中的所有主動元件也因為供電電源的消失而喪失其應有的功能。所以在停電的時候上述,根據先前技術的光接收模組將失去信號傳輸的能力,以致使用者無法接收到資訊。However, when the external power supply is interrupted and no reverse voltage V CC is applied to the photodiode 102, the circuit circuit for driving the photodiode 102 disappears, and the photodiode 102 is thus unable to generate a photoinduced current. In addition, all active components in the post-stage circuit lose their proper function due to the disappearance of the power supply. Therefore, in the case of power failure, according to the prior art, the light receiving module will lose the ability to transmit signals, so that the user cannot receive the information.
因此,需要新穎的光接收模組,其除了在正常情況下(有電時)可以提供豐富的視訊服務之外,即使因為地震、颶風、洪水等自然災害或是供電設備故障等因素而停電的時候,仍可在沒有供電的情況下,維持操作以提供資訊傳輸。Therefore, there is a need for a novel light receiving module that can provide a rich video service in addition to normal (when there is power), even if it is powered off due to natural disasters such as earthquakes, hurricanes, floods, or power supply equipment failures. At this time, the operation can still be maintained to provide information transmission without power supply.
慮及上述,本發明的目的在於提供斷電時仍然能夠傳輸資訊的光接收模組。In view of the above, it is an object of the present invention to provide a light receiving module capable of transmitting information even when power is off.
根據本發明的一態樣,提供光接收模組,其包括:信號接收及產生單元,用以接收光信號及對應地產生電信號,電信號包含射頻信號;信號處理單元,用以處理電信號;電感,一端耦接至接地;第一切換裝置,當有電源供電時,使信號接收及產生單元耦接至電源及耦接至信號處理單元的輸入端,並與電感斷開,以使射頻信號經過信號處理單元處理後輸出,當電源端斷電時,使信號接收及產生單元的輸出端連接至電感未接地的一端並使信號接收及產生單元與電源斷開,以使信號接收及產生單元仍然能產生電信號及使射頻信號輸出。According to an aspect of the present invention, a light receiving module is provided, comprising: a signal receiving and generating unit for receiving an optical signal and correspondingly generating an electrical signal, the electrical signal comprising a radio frequency signal; and a signal processing unit for processing the electrical signal The inductor is coupled to the ground at one end; the first switching device, when the power is supplied, couples the signal receiving and generating unit to the power source and the input end of the signal processing unit, and is disconnected from the inductor to enable the RF The signal is processed by the signal processing unit and output. When the power terminal is powered off, the output end of the signal receiving and generating unit is connected to the ungrounded end of the inductor and the signal receiving and generating unit is disconnected from the power source to enable signal reception and generation. The unit can still generate electrical signals and output RF signals.
根據本發明的又一態樣,提供光接收模組,其包括:信號接收及產生單元,包括:光電二極體,用於接收光信號以對應地產生包含射頻信號的電信號,及匹配電路,使光電二極體的阻抗與連接至信號接收及產生單元的外部阻抗相匹配;信號處理單元,用以處理電信號;電感,一端耦接至接地;第一切換裝置,當電源正常供電時,使該信號接收及產生單元耦接至電源,當電源斷電時,使光電二極體的陰極耦接至接地,以使信號接收及產生單元仍然能產生該電信號;第二切換裝置,當有電源供電時,使信號接收及產生單元耦接至信號處理單元的輸入端,並與電感斷開,以使射頻信號經過信號處理單元處理後輸出,當電源端斷電時,使信號接收及產生單元連接至電感未接地的一端,以使射頻信號輸出。According to still another aspect of the present invention, a light receiving module is provided, comprising: a signal receiving and generating unit, comprising: a photodiode for receiving an optical signal to correspondingly generate an electrical signal including a radio frequency signal, and a matching circuit The impedance of the photodiode is matched with the external impedance connected to the signal receiving and generating unit; the signal processing unit is for processing the electrical signal; the inductor is coupled to the ground at one end; and the first switching device is when the power supply is normally supplied. The signal receiving and generating unit is coupled to the power source, and when the power source is powered off, the cathode of the photodiode is coupled to the ground so that the signal receiving and generating unit can still generate the electrical signal; the second switching device, When the power supply is provided, the signal receiving and generating unit is coupled to the input end of the signal processing unit, and is disconnected from the inductor, so that the RF signal is processed by the signal processing unit and output, and when the power terminal is powered off, the signal is received. And the generating unit is connected to the ungrounded end of the inductor to output the RF signal.
根據本發明的實施例,信號處理單元包括放大器及自動增益控制電路。電源包括直流電壓源及與直流電壓源串接的電阻。According to an embodiment of the invention, the signal processing unit comprises an amplifier and an automatic gain control circuit. The power supply includes a DC voltage source and a resistor connected in series with the DC voltage source.
又根據本發明的實施例,光接收模組可具有第二切換裝置及用於射頻信號輸出的輸出埠,當電源端供電時,使信號處理單元的輸出端與輸出埠相連接,以及,當電源端斷電時,使該電感未接地的一端與輸出埠相連接。According to an embodiment of the present invention, the light receiving module may have a second switching device and an output port for outputting the RF signal, and when the power terminal is powered, the output end of the signal processing unit is connected to the output port, and When the power supply is powered off, connect the ungrounded end of the inductor to the output port.
又根據本發明的一實施例,可以具有二分別的射頻信號輸出埠分別連接至該信號處理單元的輸出端及該電感未接地的一端。According to an embodiment of the invention, the two separate RF signal outputs are respectively connected to the output end of the signal processing unit and the ungrounded end of the inductor.
根據本發明的光接收模組,在無電力的情形中,然能維持操作所需要的電流迴路而輸出射頻信號,如此,有電時可以提供正常的影音傳輸,在斷電時仍然可以廣播服務。以及,可視設計需求而使射頻信號在有電及無電時均由同一輸出埠輸出,或是分別從不同的輸出埠輸出。According to the light receiving module of the present invention, in the case of no power, the current loop required for the operation can be maintained to output the radio frequency signal, so that normal audio and video transmission can be provided when the power is available, and the service can still be broadcasted when the power is turned off. . As well as the visual design requirements, the RF signals are output from the same output 有 when they are powered or not, or are output from different outputs 分别.
在下述說明中,將參考附圖,說明根據本發明的實施例。本發明的一或更多實施例之細節揭示於附圖中及下述說明中。從說明及圖式、以及申請專利範圍中,將清楚本發明的上述及其它特點、目的、及優點。In the following description, embodiments according to the present invention will be described with reference to the accompanying drawings. The details of one or more embodiments of the invention are disclosed in the drawings and the description below. The above and other features, objects, and advantages of the invention will be apparent from the description and appended claims.
在各個圖式中,相同或類似的元件以相同的代號表示,且為簡明起見,避免重複說明。In the various figures, the same or similar elements are denoted by the same reference numerals, and the description is omitted for the sake of brevity.
根據本發明,在斷電的情況下,光電二極體仍然可以維持操作的電流迴路以及光電二極體因接收光信號而對應地產生之射頻(RF)信號能夠輸出。According to the present invention, in the case of power-off, the photodiode can still maintain the operating current loop and the radio frequency (RF) signal correspondingly generated by the photodiode due to the received optical signal can be output.
圖2是方塊圖,顯示根據本發明的實施例之光接收模組200。如圖2所示,光接收模組200包括光電二極體202、第一電感L0 、匹配裝置204、第一切換裝置SW1,後級處理電路206,第二電感L1 、及第二切換裝置SW2。光電二極體202接收對應的雷射二極體(未顯示)發射的光訊號而產生對應的電信號。一般而言,在正常操作時,由光電二極體202輸出的電信號包含直流信號及射頻(RF)信號。匹配裝置204使光電二極體202的阻抗與後續的後級電路的阻抗相匹配以使射頻信號輸出。第一電感L0 允許直流信號通過,但阻斷射頻信號,這是因為第一電感L0 對於射頻信號而言為無窮大的等效阻抗。光電二極體202、第一電感L0 及匹配裝置204整體地形成信號接收及產生單元。後級處理電路206作為光接收模組的信號處理單元,用以處理經由匹配裝置204輸出的電信號。如同先前技術一節所述般,後級處理電路206可以包含放大器、自動增益控制電路、等等。2 is a block diagram showing a light receiving module 200 in accordance with an embodiment of the present invention. As shown in FIG. 2, the light receiving module 200 includes a photodiode 202, a first inductor L 0 , a matching device 204 , a first switching device SW1 , a post processing circuit 206 , a second inductor L 1 , and a second switching Device SW2. The photodiode 202 receives the optical signal emitted by the corresponding laser diode (not shown) to generate a corresponding electrical signal. In general, during normal operation, the electrical signal output by photodiode 202 includes a direct current signal and a radio frequency (RF) signal. The matching device 204 matches the impedance of the photodiode 202 with the impedance of the subsequent post-stage circuit to output the radio frequency signal. The first inductance L 0 allows the direct current signal to pass but blocks the radio frequency signal because the first inductance L 0 is an infinite equivalent impedance for the radio frequency signal. Photodiode 202, the inductance L 0 and the first matching device 204 is formed integrally signal reception and generation units. The post-processing circuit 206 functions as a signal processing unit of the light receiving module for processing the electrical signals output via the matching device 204. As described in the prior art section, the post-processing circuit 206 can include an amplifier, an automatic gain control circuit, and the like.
在光接收模組200中,光電二極體202的陽極接地而陰極經由電容器C1而耦接至匹配電路204。匹配電路204的另一端經由電容器C2而耦接至第一切換裝置SW1的共同端,第一電感L0 的一端也連接至共同端,而另一端連接至光電二極體202的陽極。In the light receiving module 200, the anode of the photodiode 202 is grounded and the cathode is coupled to the matching circuit 204 via the capacitor C1. The other end of the matching circuit 204 is coupled to the common terminal of the first switching device SW1 via a capacitor C2. One end of the first inductor L 0 is also connected to the common terminal, and the other end is connected to the anode of the photodiode 202.
如此,在正常供電的情形中,第一切換裝置SW1切換至連接電阻R及L0 ,因而連接至電源VCC而使光電二極體202逆向偏壓。此時,當光電二極體接收到光信號後,會將其轉換為包含射頻信號的電信號。如上所述,所產生的射頻信號不會流經第一電感L0 ,而是經由匹配電路204輸出至後級電路206。然後,後級處理電路206將輸入的射頻信號進行放大,濾波等處理而經由第二切換裝置SW2而傳送至輸出埠,而輸入至例如影音設備等外部裝置(未顯示)。第二切換裝置SW2在正常供電時係將射頻(RF)輸出埠連接至後級電路206的輸出端,在斷電時係將RF輸出埠連接至L1 的一端。Thus, in the case of the normal power supply, the first switching means SW1 is switched to connect the resistor R and L 0, and thus the power supply VCC is connected to the photo diode 202 reverse biased. At this time, when the photodiode receives the optical signal, it converts it into an electrical signal containing the radio frequency signal. As described above, the generated radio frequency signal does not flow through the first inductor L 0 but is output to the post-stage circuit 206 via the matching circuit 204. Then, the post-processing circuit 206 amplifies the input radio frequency signal, performs filtering, and the like, and transmits it to the output port via the second switching device SW2, and inputs it to an external device (not shown) such as an audio-visual device. The second switching means SW2 output terminal based radio frequency (RF) output port connected to the rear stage circuit 206 in the normal power supply line connected to the RF output port to the end of L 1 at power-off.
在電力中斷的情形中,如圖2所示,切換裝置SW1如虛線箭頭所示般,將第一電感L0 的一端連接至第二電感L1 ,而不與電阻R連接。如此,藉由第一開關SW1的切換,光電二極體202的陰極經由第一電感L0 而串連第二電感L1 ,最後連接到地而形成迴路。此時,直流電流由光電二極體202流經第一及第二電感L0 及L1 (對直流信號而言為短路)而接地,同時,電阻R與光電二極體202斷開而不會因其高電阻影響光電二極體202因接收光信號而對應地產生的電信號。如此,光電二極體202轉換的射頻信號依序經由匹配電路204、第一切換裝置SW1、及第二開關SW2而輸出至射頻輸出埠。此時,由於第二電感L1 會阻止射頻信號經其流至接地地端,所以,射頻信號可以從第一開關SW1直接傳送至第二切換裝置SW2。值得注意的是,在無電力時,第二電感L1 對於光電二極體202因接收光信號而產生的電信號中的直流信號是短路,但對於電信號中的射頻(RF)信號是開路,所以,光電二極體202產生的直流信號能形成有效的電路迴路,而射頻信號卻不會流至接地而能從射頻輸出埠輸出。換言之,倘若沒有經由第二電感L1 而接地,則無電時光電二極體202的直流迴路為開路狀態以致於無射頻信號輸出,若未設置第二電感L1 而直接接地,則射頻信號會流入接地端而無法從射頻輸出埠輸出。In the case of the power interruption, shown in Figure 2, the switching device SW1 as shown as a dotted arrow, the second inductor is connected to one end of a first inductor L 1 L 0, not connected to the resistance R. Thus, by switching the first switch SW1, photodiode cathode 202 via a first series inductor and the second inductor L 0 L 1, and finally connected to ground to form a loop. At this time, the direct current is grounded by the photodiode 202 flowing through the first and second inductors L 0 and L 1 (short for the direct current signal), and the resistor R is disconnected from the photodiode 202 without The electrical signal generated by the photodiode 202 due to the reception of the optical signal is affected by its high resistance. In this way, the RF signal converted by the photodiode 202 is sequentially output to the RF output port via the matching circuit 204, the first switching device SW1, and the second switch SW2. At this time, since the second inductor L 1 blocks the radio frequency signal from flowing to the grounded end, the radio frequency signal can be directly transmitted from the first switch SW1 to the second switching device SW2. It is worth noting that, in the absence of power, the second inductor L 1 is short-circuited to the DC signal in the electrical signal generated by the photodiode 202 due to the reception of the optical signal, but is open to the radio frequency (RF) signal in the electrical signal. Therefore, the DC signal generated by the photodiode 202 can form an effective circuit loop, and the RF signal does not flow to the ground and can be output from the RF output. In other words, if not through the second inductor L 1 is grounded, when no DC power circuit 202 of the photodiode body in an open state so that no RF signal output, a second inductor L 1 if not directly grounded, the RF signals may It flows into the ground and cannot be output from the RF output.
此外,由於第一切換裝置SW1及第二切換裝置SW2在無電時會切換成直接連接而與電源端的電阻R斷開,所以射頻信號不會受電阻R的高電阻影響而使強度衰減。In addition, since the first switching device SW1 and the second switching device SW2 are switched to be directly connected to be disconnected from the resistor R of the power supply terminal when there is no power, the RF signal is not affected by the high resistance of the resistor R to attenuate the intensity.
如此,根據本實施例,在無電力的情形中,由於切換裝置SW1和SW2及電感L1 的協同操作,光電二極體202維持操作所需要的電流迴路仍然維持通路而不會斷開,且射頻信號的強度不會因電源端的高電阻而衰減。同時,射頻信號能夠經由有電時的輸出埠輸出,亦即,根據本實施,無電時與有電時,射頻信號均從同一個射頻輸出埠輸出。如此,有電時可以提供正常的影音傳輸,在斷電時仍然可以廣播服務。Thus, according to this embodiment, in the case of no electricity, since the switching means SW1 and SW2 and cooperating inductance of L 1, photodiode 202 to maintain the desired operation of the loop current without breaking passage remains, and The strength of the RF signal is not attenuated by the high resistance of the power supply. At the same time, the RF signal can be output through the output 有 when the power is on, that is, according to the present embodiment, when there is no power and when there is power, the RF signal is output from the same RF output 埠. In this way, normal audio and video transmission can be provided when there is power, and the service can still be broadcasted when the power is off.
圖3是方塊圖,顯示根據本發明的另一實施例之光接收模組300。FIG. 3 is a block diagram showing a light receiving module 300 in accordance with another embodiment of the present invention.
圖3中所示的光接收模組與圖2中所示的光接收模組主要不同之處在於僅設置第一切換裝置SW1而未設置第二切換裝置SW2、以及增加設置第二射頻輸出埠。圖3中與圖2中相同或類似的部份以相同的代號表示,並省略其說明。The light receiving module shown in FIG. 3 is mainly different from the light receiving module shown in FIG. 2 in that only the first switching device SW1 is provided and the second switching device SW2 is not provided, and the second RF output is added. . The same or similar portions in Fig. 3 as those in Fig. 2 are denoted by the same reference numerals, and the description thereof will be omitted.
光接收模組300僅設置第一切換裝置SW1,以便在斷電時,切換至電感L1 ,並設置第二射頻輸出埠以便在斷電時使射頻信號經由此埠輸出。如此,在有電時,射頻信號經由第一射頻輸出埠輸出,而在無電時則經由第二射頻輸出埠輸出。The light receiving module 300 is only provided with the first switching device SW1 to switch to the inductor L 1 when the power is off, and to set the second RF output port to output the radio frequency signal via the buffer when the power is off. Thus, when there is power, the RF signal is output via the first RF output, and when there is no power, it is output via the second RF output.
此外,由於第一開關SW1在無電時會切換成與電源端的電阻R斷開且射頻信號直接由第二射頻輸出埠輸出,所以射頻信號不會受電阻R的高電阻影響而使強度衰減。In addition, since the first switch SW1 is switched to be disconnected from the resistor R of the power supply terminal when the power is off, and the radio frequency signal is directly outputted from the second RF output port, the radio frequency signal is not affected by the high resistance of the resistor R to attenuate the intensity.
如此,根據本實施例,在無電力的情形中,由於切換裝置SW1及電感L1 的協同操作,光電二極體202維持操作所需要的電流迴路仍然維持通路而不會斷開,且射頻信號的強度不會因電源端的高電阻而衰減。如此,有電時可以提供正常的影音傳輸,在斷電時仍然可以廣播服務。Thus, according to this embodiment, in the case of no electricity, since the switching device SW1 and the inductance of L 1 coordinated operation, photodiode 202 to maintain the desired operation of the current loop path remains without breaking, and the radio frequency signal The strength does not decay due to the high resistance of the power supply. In this way, normal audio and video transmission can be provided when there is power, and the service can still be broadcasted when the power is off.
圖4是方塊圖,顯示根據本發明的又另一實施例之光接收模組400。4 is a block diagram showing a light receiving module 400 in accordance with still another embodiment of the present invention.
圖4中所示的光接收模組400與圖2中所示的光接收模組200主要不同之處在於在電源端VCC 與光電二極體202之間增加設置第三切換裝置SW3。圖4中與圖2中相同或類似的部份以相同的代號表示,並省略其說明。The light receiving module 400 shown in FIG. 4 is mainly different from the light receiving module 200 shown in FIG. 2 in that a third switching device SW3 is additionally provided between the power supply terminal V CC and the photodiode 202. The same or similar portions in Fig. 4 as those in Fig. 2 are denoted by the same reference numerals, and the description thereof will be omitted.
如圖4所示,第三切換裝置SW3設置於光二極體202的陰極與電阻R之間。在正常供電時,第三切換裝置SW3使光二極體202接受電源電壓Vcc的逆向偏壓。在此情形中,當光二極體202接收光信號而對應地產生的電信號之射頻信號的輸出路徑與參考圖2之上述說明相同。射頻信號會經由匹配電路204、第一開關SW1、後級處理電路206、及第二切換裝置SW2而輸出至射頻輸出埠。As shown in FIG. 4, the third switching device SW3 is disposed between the cathode of the photodiode 202 and the resistor R. At the time of normal power supply, the third switching device SW3 causes the photodiode 202 to receive the reverse bias of the power supply voltage Vcc. In this case, the output path of the radio frequency signal of the electric signal correspondingly generated when the photodiode 202 receives the optical signal is the same as that described above with reference to FIG. The RF signal is output to the RF output port via the matching circuit 204, the first switch SW1, the post-processing circuit 206, and the second switching device SW2.
在電力中斷時,第三切換裝置SW3與電源電壓VCC 斷關而連接至接地以使光電二極體202在斷電時仍然能夠維持直流信號的導通迴路。至於第一及第二切換裝置SW1及SW2的操作以及射頻信號的輸出徑則與前述參考圖2的說明中所述相同,於此不再贅述。When the power is interrupted, the third switching device SW3 is disconnected from the power supply voltage V CC and connected to the ground so that the photodiode 202 can maintain the conduction loop of the direct current signal when the power is turned off. The operation of the first and second switching devices SW1 and SW2 and the output path of the radio frequency signal are the same as those described above with reference to the description of FIG. 2, and details are not described herein again.
如此,根據本實施例,在無電力的情形中,由於切換裝置SW1、SW2和SW3及電感L1 的協同操作,光電二極體202維持操作所需要的電流迴路仍然維持通路而不會斷開,且射頻信號的強度不會因電源端的高電阻而衰減。同時,射頻信號能夠經由有電時的輸出埠輸出,亦即,根據本實施,無電時與有電時,射頻信號均從同一個射頻輸出埠輸出。如此,有電時可以提供正常的影音傳輸,在斷電時仍然可以廣播服務。Thus, according to this embodiment, in the case of no electricity, since the switching means SW1, SW2 and SW3, and cooperating inductance of L 1, photodiode 202 to maintain the desired operation of the current loop path remains without breaking And the strength of the RF signal is not attenuated by the high resistance of the power supply terminal. At the same time, the RF signal can be output through the output 有 when the power is on, that is, according to the present embodiment, when there is no power and when there is power, the RF signal is output from the same RF output 埠. In this way, normal audio and video transmission can be provided when there is power, and the service can still be broadcasted when the power is off.
圖5是方塊圖,顯示根據本發明的另一實施例之光接收模組500。FIG. 5 is a block diagram showing a light receiving module 500 in accordance with another embodiment of the present invention.
圖5中所示的光接收模組與圖4中所示的光接收模組主要不同之處在於未設置第二切換裝置SW1以及增加設置第二射頻輸出埠。圖5中與圖4相同或類似的部份以相同的代號表示,並省略其說明。The light receiving module shown in FIG. 5 is mainly different from the light receiving module shown in FIG. 4 in that the second switching device SW1 is not provided and the second RF output port is set. The same or similar portions in FIG. 5 as those in FIG. 4 are denoted by the same reference numerals, and the description thereof will be omitted.
光接收模組500未設置第二切換裝置SW2,而是設置第一射頻輸出埠作為正常供電時射頻信號的輸出埠,以及設置第二射頻輸出埠作為而電力中斷時射頻信號的輸出埠。如此,在有電時,射頻信號經由第一射頻輸出埠輸出,而在無電時則經由第二射頻輸出埠輸出。The light receiving module 500 is not provided with the second switching device SW2, but sets the first RF output port as the output port of the RF signal during normal power supply, and sets the second RF output port as the output port of the RF signal when the power is interrupted. Thus, when there is power, the RF signal is output via the first RF output, and when there is no power, it is output via the second RF output.
如此,根據本實施例,在無電力的情形中,由於切換裝置SW1和SW3及電感L1 的協同操作,光電二極體202維持操作所需要的電流迴路仍然維持通路而不會斷開,且射頻信號的強度不會因電源端的高電阻而衰減。如此,有電時可以提供正常的影音傳輸,在斷電時仍然可以廣播服務。Thus, according to this embodiment, in the case of no electricity, since switching devices SW1 and SW3, and cooperating inductance of L 1, photodiode 202 to maintain the desired operation of the loop current without breaking passage remains, and The strength of the RF signal is not attenuated by the high resistance of the power supply. In this way, normal audio and video transmission can be provided when there is power, and the service can still be broadcasted when the power is off.
雖然已於前述說明書中說明本發明的較佳實施例,但是,上述說明僅為說明之用且不應被解譯為限定本發明之範圍,習於此技藝者在不悖離本發明的精神之下,可以執行很多修改、替代,後附之申請專利範圍係涵蓋所有這些落在本發明範圍及精神之內的修改、替代及均等性。While the preferred embodiment of the present invention has been described in the foregoing specification, the foregoing description is intended to be illustrative only There are many modifications and substitutions that can be made without departing from the scope and spirit of the invention.
200...光接收模組200. . . Light receiving module
202...光電二極體202. . . Photodiode
204...匹配電路204. . . Matching circuit
206...後級電路206. . . Rear stage circuit
300...光接收模組300. . . Light receiving module
400...光接收模組400. . . Light receiving module
500...光接收模組500. . . Light receiving module
L0 ...第一電感L 0 . . . First inductance
L1 ...第二電感L 1 . . . Second inductance
SW1...第一開關SW1. . . First switch
SW2...第二開關SW2. . . Second switch
SW3...第三開關SW3. . . Third switch
圖1顯示先前技術的光接收模組。Figure 1 shows a prior art light receiving module.
圖2是方塊圖顯示根據本發明的實施例之光接收模組。2 is a block diagram showing a light receiving module in accordance with an embodiment of the present invention.
圖3是方塊圖顯示根據本發明的另一實施例之光接收模組。3 is a block diagram showing a light receiving module according to another embodiment of the present invention.
圖4是方塊圖顯示根據本發明的又另一實施例之光接收模組。4 is a block diagram showing a light receiving module according to still another embodiment of the present invention.
圖5是方塊圖顯示根據本發明的仍然又另一實施例之光接收模組。Figure 5 is a block diagram showing a light receiving module according to still another embodiment of the present invention.
200...光接收模組200. . . Light receiving module
202...光電二極體202. . . Photodiode
204...匹配電路204. . . Matching circuit
206...後級電路206. . . Rear stage circuit
L0 ...第一電感L 0 . . . First inductance
L1 ...第二電感L 1 . . . Second inductance
SW1...第一開關SW1. . . First switch
SW2...第二開關SW2. . . Second switch
Claims (11)
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Citations (2)
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TWM249353U (en) * | 2002-07-22 | 2004-11-01 | Delta Electronics Inc | Power circuit in uninterruptible power supply |
TWM330669U (en) * | 2007-10-09 | 2008-04-11 | Memoright Memoritech Corp | Protective circuit for power outage system |
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TWM249353U (en) * | 2002-07-22 | 2004-11-01 | Delta Electronics Inc | Power circuit in uninterruptible power supply |
TWM330669U (en) * | 2007-10-09 | 2008-04-11 | Memoright Memoritech Corp | Protective circuit for power outage system |
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