WO2016041417A1 - 一种lnb环穿极化电压切换控制电路及装置 - Google Patents

一种lnb环穿极化电压切换控制电路及装置 Download PDF

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Publication number
WO2016041417A1
WO2016041417A1 PCT/CN2015/085697 CN2015085697W WO2016041417A1 WO 2016041417 A1 WO2016041417 A1 WO 2016041417A1 CN 2015085697 W CN2015085697 W CN 2015085697W WO 2016041417 A1 WO2016041417 A1 WO 2016041417A1
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Prior art keywords
voltage
resistor
polarization voltage
lnb
transistor
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PCT/CN2015/085697
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English (en)
French (fr)
Inventor
陈少辉
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深圳市九洲电器有限公司
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Publication of WO2016041417A1 publication Critical patent/WO2016041417A1/zh

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00Television systems
    • H04N7/20Adaptations for transmission via a GHz frequency band, e.g. via satellite
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41Structure of client; Structure of client peripherals

Definitions

  • the present invention relates to a circuit structure, and in particular, to an LNB ring polarization voltage switching control circuit and device.
  • the satellite set-top box search satellite ⁇ selects the vertical or horizontal polarized wave to be received by polarization electronically controlled switching.
  • the vertical polarization voltage VV is 13V
  • the horizontal polarization voltage VH is 18V.
  • the satellite set-top box usually has an LNB (high-frequency head) controller built in, which supplies power to the LNB and provides control signals (13/18V switching, 22kHz tone, etc.).
  • the RF IN short signal input interface
  • the LOOP OUT loop-through output interface
  • the LNB controller of the lower computer which is equivalent to two LNB controllers controlling one LNB.
  • the two LNB controllers will not control the voltage control, and the upper LNB controller is set to the horizontal polarization voltage (18V), due to The limitation of the horizontal polarization voltage of the upper computer, the lower computer will not be able to switch the polarization voltage to the vertical polarization voltage (13V), which brings great inconvenience to the lower position machine switching polarization voltage, affecting the operation of the lower computer.
  • the present invention provides an LNB ring-polarization voltage switching control circuit connected between a satellite signal input interface and a ring-through output interface of a satellite set-top box host computer, including: a voltage detecting unit, a voltage judging unit, and a voltage control
  • the voltage detecting unit is configured to detect a voltage of the ringing output interface
  • the voltage determining unit is configured to determine whether a voltage of the ringing output interface is equal to a vertical polarization voltage, and determine The result is passed to the voltage control unit, and the voltage control unit controls the voltage of the satellite signal input interface of the upper computer to be a vertical polarization voltage according to the judgment result, the voltage of the ringing output interface is equal to the vertical polarization voltage ⁇ .
  • the present invention also provides an apparatus comprising the LNB loop-polarization voltage switching control circuit described above.
  • the LNB loop-polarization voltage switching control circuit and device of the present invention control the voltage of the loop-through output interface, and the voltage is switched to the vertical polarization voltage ⁇ at the loop-through output interface, that is, the voltage of the lower-end LNB controller is controlled.
  • the voltage of the satellite signal input interface is also a vertical polarization voltage, so that the lower position machine can control the upper computer, and the vertical polarization voltage can also be switched to the vertical polarization voltage in the upper computer, and the polarization voltage is switched to the lower position machine. The great convenience guarantees the work of the lower computer.
  • FIG. 1 is a schematic structural view of a satellite set top box LNB looped in an embodiment
  • FIG. 2 is a structural diagram of an LNB ring-polarization voltage switching control circuit in an embodiment
  • FIG. 3 is a detailed structural diagram of an LNB ring-polarization voltage switching control circuit in one embodiment.
  • FIG. 2 is a structural diagram of an LNB ring polarization voltage switching control circuit in one embodiment
  • FIG. 3 is a specific structural diagram of an LNB ring polarization voltage switching control circuit in one embodiment.
  • the LN B ring polarization voltage switching control circuit is connected between the RF IN (satellite signal input interface) and the LOOP OUT (loop through output interface) of the satellite set top box upper computer, including: a voltage detecting unit 100.
  • Voltage determination unit 200 and voltage control unit 300.
  • the voltage detecting unit 100 is configured to detect the voltage of the loop-through output interface (LOOP)
  • the voltage of OUT that is, the voltage of the lower-end LNB controller, is supplied to the voltage judging unit 200.
  • LOOP loop-through output interface
  • the voltage judging unit 200 is configured to determine whether the voltage of the loop-through output interface is equal to the vertical polarization voltage (usually 13V, or can be adjusted according to requirements), and the judgment result is sent to the voltage control unit 300.
  • the voltage control unit 30 0 controls the voltage of the satellite signal input interface (RF IN) of the upper computer to be a vertical polarization voltage according to the judgment result, the voltage at the ringing output interface is equal to the vertical polarization voltage ⁇ .
  • the loop-through output interface that is, the voltage of the lower-end LNB controller is switched to the vertical polarization voltage ⁇ , and the voltage of the control satellite signal input interface is also a vertical polarization voltage, thereby making the lower position
  • the machine can control the upper computer.
  • the upper computer is horizontally polarized (usually 18V), it can also switch to vertical polarization voltage, which brings great convenience to the lower computer to switch the polarization voltage, which ensures the operation of the lower computer.
  • the voltage detecting unit 100 includes a first transistor Q1, a first resistor R1, and a second resistor R2.
  • the collector C of the first transistor Q1 and one end of the first resistor R1 are connected to the loop-through output interface (LOOP OUT), and the other end of the first resistor R1 is connected to the base B of the first transistor Q1.
  • the second resistor R2 is connected to the other end of the first resistor R1 and the other end is grounded.
  • the emitter E of the first transistor Q1 is connected to the voltage judging unit 200.
  • the first transistor Q1 has a threshold voltage, and the voltage of the loop-through output interface is greater than the threshold voltage, and the first transistor Q1 is turned on, otherwise it is not turned on.
  • the threshold voltage is 0.7V ⁇ threshold voltage ⁇ vertical polarization voltage, and 0.7V is the conduction voltage drop of the first transistor Q1.
  • the voltage judging unit 200 includes a second transistor Q2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6.
  • the third resistor R3 is connected to the emitter E of the first transistor Q1, and the other end is connected to one end of the fourth resistor R4 and the sixth resistor R6, respectively.
  • the other end of the fourth resistor R4 is connected to the base B of the second transistor Q2, and the other end of the sixth resistor R6 is connected to the emitter 5 of the second transistor Q2.
  • the fifth resistor R5 is connected to the other end of the fourth resistor R4, and the other end is grounded.
  • the second transistor Q2 collector C is grounded.
  • the voltage control unit 300 is connected to the emitter of the second transistor Q2.
  • the voltage detecting unit 100 is turned on, and the voltage determining unit 200 determines that the voltage of the loop-through output interface is equal to the vertical polarization voltage, and the second transistor Q2 does not. Turning on, the output is high level to the voltage control unit 300. Further, when the ring-through output interface voltage is a horizontal polarization voltage ⁇ , that is, the lower-position machine switches to a horizontal polarization voltage ⁇ , the second transistor Q2 is turned on, and the output is low-powered. It is flat to the voltage control unit 300. Adjust the resistors R3, R4 and R5 to adjust the high level voltage. Adjusting R4 and R5 allows the vertical polarization voltage and horizontal polarization voltage to be judged.
  • the voltage control unit 300 includes a third transistor Q3 and a Zener diode Z1.
  • the base transistor B of the third transistor Q3 is connected to the emitter E of the second transistor Q2, the emitter E is grounded, the collector C is connected to one end of the Zener diode Z1, and the other end of the Zener diode Z1 is connected to the satellite information of the host computer.
  • Input interface that is, the LNB controller connected to the host computer.
  • the third transistor Q3 is turned on at a high level, and the Zener diode Z1 clamps the voltage to a vertical polarization voltage (usually 13V), so that the voltage of the satellite information input interface RF IN is a vertical polarization voltage, due to the LNB.
  • the third transistor Q3 is not conducting at a low level, and the Zener diode Z1 does not function.
  • the upper computer in order to enable the upper computer to be controlled as a vertical polarization voltage ⁇ by the lower computer, it can be switched to a horizontal polarization voltage as needed, and the base B of the third transistor Q3 is also the master of the upper computer. Chip connection. After the host computer switches back to the horizontal polarization voltage, the main chip forcibly controls the third transistor Q3 to be non-conducting, and switches the satellite information input interface from the vertical polarization voltage to the horizontal polarization voltage (usually 18V), thereby The host computer completes the active switch.
  • control circuit further includes a diode D1.
  • Diode D1 is connected between the RF IN (satellite signal input interface) and LOOP OUT (loop through output interface) of the host computer to prevent circuit backflow.
  • the LNB loop-through polarization voltage switching control circuit detects the voltage of the loop-through output interface, and controls the satellite signal input interface at the loop-through output interface, that is, the voltage of the lower-end LNB controller is switched to the vertical polarization voltage ⁇ The voltage is also a vertical polarization voltage, so that the lower computer can control the upper computer.
  • the upper computer When the upper computer is horizontally polarized (usually 18V), it can also switch to vertical polarization voltage, which can be used to switch the polarization voltage to the lower computer.
  • great convenience guarantee the work of the lower computer.
  • the present invention also provides an apparatus.
  • the device includes an LNB loop through polarization switching control circuit.
  • FIG. 2 is a structural diagram of an LNB ring-polarization voltage switching control circuit in one embodiment
  • FIG. 3 is a detailed structural diagram of an LNB ring-polarization voltage switching control circuit in one embodiment.
  • the LN B ring polarization voltage switching control circuit is connected between the RF IN (satellite signal input interface) and the LOOP OUT (loop through output interface) of the satellite set top box upper computer, including: a voltage detecting unit 100, voltage judgment The cell 200 and the voltage control unit 300 are turned off.
  • the voltage detecting unit 100 is configured to detect the voltage of the loop-through output interface (LOOP)
  • the voltage of OUT that is, the voltage of the lower-end LNB controller, is supplied to the voltage judging unit 200.
  • the voltage judging unit 200 is configured to judge whether the voltage of the loop-through output interface is equal to the vertical polarization voltage (usually 13V, or can be adjusted according to requirements), and the judgment result is passed to the voltage control unit 300.
  • the voltage control unit 30 0 controls the voltage of the satellite signal input interface (RF IN) of the upper computer to be a vertical polarization voltage according to the judgment result, when the voltage of the loop-through output interface is equal to the vertical polarization voltage ⁇ .
  • the loop-through output interface that is, the voltage of the lower-end LNB controller is switched to the vertical polarization voltage ⁇ , and the voltage of the control satellite signal input interface is also a vertical polarization voltage, thereby making the lower position
  • the machine can control the upper computer.
  • the upper computer is horizontally polarized (usually 18V), it can also switch to vertical polarization voltage, which brings great convenience to the lower computer to switch the polarization voltage, which ensures the operation of the lower computer.
  • the voltage detecting unit 100 includes a first transistor Q1, a first resistor R1, and a second resistor R2.
  • the collector C of the first transistor Q1 and one end of the first resistor R1 are connected to the loop-through output interface (LOOP OUT), and the other end of the first resistor R1 is connected to the base B of the first transistor Q1.
  • the second resistor R2 is connected to the other end of the first resistor R1 and the other end is grounded.
  • the emitter E of the first transistor Q1 is connected to the voltage judging unit 200.
  • the first transistor Q1 has a threshold voltage, and the voltage of the loop-through output interface is greater than the threshold voltage, and the first transistor Q1 is turned on, otherwise it is not turned on.
  • the threshold voltage is 0.7V ⁇ threshold voltage ⁇ vertical polarization voltage, and 0.7V is the conduction voltage drop of the first transistor Q1.
  • the voltage judging unit 200 includes a second transistor Q2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6.
  • the third resistor R3 is connected to the emitter E of the first transistor Q1, and the other end is connected to one end of the fourth resistor R4 and the sixth resistor R6, respectively.
  • the other end of the fourth resistor R4 is connected to the base B of the second transistor Q2, and the other end of the sixth resistor R6 is connected to the emitter 5 of the second transistor Q2.
  • the fifth resistor R5 is connected to the other end of the fourth resistor R4, and the other end is grounded.
  • the second transistor Q2 collector C is grounded.
  • the voltage control unit 300 is connected to the emitter of the second transistor Q2.
  • the voltage detecting unit 100 is turned on, and the voltage determining unit 200 determines that the voltage of the loop-through output interface is equal to the vertical polarization voltage, and the second transistor Q2 does not. Turning on, the output is high level to the voltage control unit 300. Further, when the looping output interface voltage is the horizontal polarization voltage ⁇ , that is, the lower computer switches to the horizontal polarization voltage ⁇ , the second transistor Q2 is turned on, and the low level is output to the voltage control unit 300. Adjust the resistors R3, R4 and R5 to adjust the high level voltage. Adjusting R4 and R5 allows the vertical polarization voltage and horizontal polarization voltage to be judged.
  • the voltage control unit 300 includes a third transistor Q3 and a Zener diode Z1.
  • the base transistor B of the third transistor Q3 is connected to the emitter E of the second transistor Q2, the emitter E is grounded, the collector C is connected to one end of the Zener diode Z1, and the other end of the Zener diode Z1 is connected to the satellite information of the host computer.
  • Input interface that is, the LNB controller connected to the host computer.
  • the third transistor Q3 is turned on at a high level, and the Zener diode Z1 clamps the voltage to a vertical polarization voltage (usually 13V), so that the voltage of the satellite information input interface RF IN is a vertical polarization voltage, due to the LNB.
  • the third transistor Q3 is not conducting at a low level, and the Zener diode Z1 does not function.
  • the upper computer in order to enable the upper computer to be controlled as a vertical polarization voltage ⁇ by the lower computer, it can be switched to a horizontal polarization voltage as needed, and the base B of the third transistor Q3 is also the master of the upper computer. Chip connection. After the host computer switches back to the horizontal polarization voltage, the main chip forcibly controls the third transistor Q3 to be non-conducting, and switches the satellite information input interface from the vertical polarization voltage to the horizontal polarization voltage (usually 18V), thereby The host computer completes the active switch.
  • control circuit further includes a diode D1.
  • Diode D1 is connected between the RF IN (satellite signal input interface) and LOOP OUT (loop through output interface) of the host computer to prevent circuit backflow.
  • the device detects the voltage of the loop-through output interface, and switches the voltage to the vertical polarization voltage ⁇ at the loop-through output interface, that is, the voltage of the control satellite signal input interface is also the vertical polarization voltage. Therefore, the lower computer can control the upper computer.
  • the upper computer When the upper computer is horizontally polarized (usually 18 V), it can also be switched to the vertical polarization voltage, which greatly facilitates the switching of the polarization voltage of the lower computer. The work of the lower computer.
  • the LNB loop-polarization voltage switching control circuit and device of the present invention controls the voltage of the loop-through output interface to control the voltage of the loop-through output interface, that is, the voltage of the lower-end LNB controller is switched to the vertical polarization voltage ⁇ , and the control is performed.
  • the voltage of the satellite signal input interface is also a vertical polarization voltage, so that the lower computer can control
  • the bit machine, in the upper computer is horizontally polarized voltage (usually 18V) ⁇ can also be switched to vertical polarization voltage, which brings great convenience to the lower position machine to switch the polarization voltage, which ensures the operation of the lower position machine.

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Abstract

本发明涉及一种LNB环穿极化电压切换控制电路及装置,连接在卫星机顶盒上位机的卫星信号输入接口和环穿输出接口之间,包括:电压检测单元、电压判断单元以及电压控制单元;电压检测单元用于检测环穿输出接口的电压,电压判断单元用于判断环穿输出接口的电压是否等于垂直极化电压,电压控制单元在环穿输出接口的电压等于垂直极化电压时,控制上位机的卫星信号输入接口的电压为垂直极化电压。本发明通过检测判断环穿输出接口的电压,在环穿输出接口切换为垂直极化电压时,控制卫星信号输入接口的电压也为垂直极化电压,从而使得下位机能够控制上位机,在上位机为水平极化电压时也能切换为垂直极化电压,给下位机切换极化电压带来极大的便利。

Description

发明名称:一种 LNB环穿极化电压切换控制电路及装置
技术领域
[0001] 本发明涉及电路结构, 尤其涉及一种 LNB环穿极化电压切换控制电路及装置。
背景技术
[0002] 卫星机顶盒搜索卫星吋通过极化电控切换来选择所需接收的垂直或水平极化波 , 通常, 垂直极化电压 VV为 13V,水平极化电压 VH为 18V。 卫星机顶盒一般内置 有 LNB (高频头) 控制器, 为 LNB供电及提供控制信号 (13/18V切换, 22kHz tone等信号) 。
当卫星机顶盒使用 LNB环穿功能吋, 如图 1所示, 即卫星机顶盒上位机的 RF IN (卫星信号输入接口) 接卫星信号, LOOP OUT (环穿输出接口) 接卫星机顶盒 下位机的 RF IN, 即 LOOP OUT连接下位机的 LNB控制器, 相当于两个 LNB控制 器控制一个 LNB。 但是, 由于水平和垂直极化电压只能有一个存在, 两个 LNB 控制器同吋控制会弓 I起电压控制不到位, 当上位机 LNB控制器设置为水平极化 电压 (18V) 吋, 由于上位机的水平极化电压的限制, 下位机将不能把极化电压 切换为垂直极化电压 (13V) , 这就给下位机切换极化电压带来极大的不便, 影 响下位机的工作。
技术问题
[0004] 有鉴于此, 有必要针对上述卫星机顶盒上位机设置为水平极化电压, 下位机不 能切换为垂直极化电压的问题, 提供一种 LNB环穿极化电压切换控制电路及装 置。
问题的解决方案
技术解决方案
[0005] 本发明提供的一种 LNB环穿极化电压切换控制电路, 连接在卫星机顶盒上位机 的卫星信号输入接口和环穿输出接口之间, 包括: 电压检测单元、 电压判断单 元以及电压控制单元; 所述电压检测单元用于检测环穿输出接口的电压, 所述 电压判断单元用于判断环穿输出接口的电压是否等于垂直极化电压, 并将判断 结果交由电压控制单元, 所述电压控制单元根据判断结果, 在环穿输出接口的 电压等于垂直极化电压吋, 控制上位机的卫星信号输入接口的电压为垂直极化 电压。
[0006] 本发明还提供一种装置, 包括上述的 LNB环穿极化电压切换控制电路。
发明的有益效果
有益效果
[0007] 本发明的 LNB环穿极化电压切换控制电路及装置, 通过检测判断环穿输出接口 的电压, 在环穿输出接口, 即下位机 LNB控制器电压切换为垂直极化电压吋, 控制卫星信号输入接口的电压也为垂直极化电压, 从而使得下位机能够控制上 位机, 在上位机为水平极化电压吋也能切换为垂直极化电压, 给下位机切换极 化电压带来极大的便利, 保证了下位机的工作。
对附图的简要说明
附图说明
[0008] 图 1是一个实施例中的卫星机顶盒 LNB环穿的结构示意图;
[0009] 图 2是一个实施例中的 LNB环穿极化电压切换控制电路的结构图;
[0010] 图 3是一个实施例中的 LNB环穿极化电压切换控制电路的具体结构图。
本发明的实施方式
[0011] 为了使本发明的目的、 技术方案及优点更加清楚明白, 以下结合附图及实施例
, 对本发明进行进一步详细说明。 应当理解, 此处所描述的具体实施例仅用以 解释本发明, 并不用于限定本发明。
[0012] 图 2是一个实施例中的 LNB环穿极化电压切换控制电路的结构图, 图 3是一个实 施例中的 LNB环穿极化电压切换控制电路的具体结构图。 结合图 2和图 3, 该 LN B环穿极化电压切换控制电路连接在卫星机顶盒上位机的 RF IN (卫星信号输入 接口) 和 LOOP OUT (环穿输出接口) 之间, 包括: 电压检测单元 100、 电压判 断单元 200以及电压控制单元 300。 电压检测单元 100用于检测环穿输出接口的电 压 (LOOP OUT的电压, 即下位机 LNB控制器的电压) , 并交与电压判断单元 200。 电压判 断单元 200用于判断环穿输出接口的电压是否等于垂直极化电压 (通常为 13V, 也可以根据需求调整) , 并将判断结果交由电压控制单元 300。 电压控制单元 30 0根据判断结果, 在环穿输出接口的电压等于垂直极化电压吋, 控制上位机的卫 星信号输入接口 (RF IN) 的电压为垂直极化电压。 这样, 通过检测判断环穿输 出接口的电压, 在环穿输出接口, 即下位机 LNB控制器电压切换为垂直极化电 压吋, 控制卫星信号输入接口的电压也为垂直极化电压, 从而使得下位机能够 控制上位机, 在上位机为水平极化电压 (通常为 18V) 吋也能切换为垂直极化电 压, 给下位机切换极化电压带来极大的便利, 保证了下位机的工作。
[0013] 在该实施例中, 电压检测单元 100包括第一三极管 Ql、 第一电阻 R1和第二电阻 R2。 第一三极管 Q1的集电极 C和第一电阻 R1的一端连接环穿输出接口 (LOOP OUT) , 第一电阻 R1另一端连接第一三极管 Q1的基极 B。 第二电阻 R2—端与第 一电阻 R1另一端连接, 另一端接地。 第一三极管 Q1的发射极 E连接电压判断单 元 200。
[0014] 第一三极管 Q1具有门限电压, 环穿输出接口的电压大于门限电压吋第一三极管 Q1导通, 否则不导通。 为降低其他电压的干扰, 进一步的, 门限电压为 0.7V < 门限电压<垂直极化电压, 0.7V为第一三极管 Q1导通压降。 设置第一电阻 R1和第 二电阻 R2, 能够对第一三极管 Q1导通压降进行调整, 满足 R1/(R1+R2)≥0.7。
[0015] 电压判断单元 200包括第二三极管 Q2、 第三电阻 R3、 第四电阻 R4、 第五电阻 R5 以及第六电阻 R6。 第三电阻 R3—端连接第一三极管 Q1的发射极 E, 另一端分别 连接第四电阻 R4和第六电阻 R6的一端。 第四电阻 R4的另一端连接第二三极管 Q2 的基极 B, 第六电阻 R6另一端连接第二三极管 Q2的发射极5。 第五电阻 R5—端连 接第四电阻 R4另一端, 另一端接地。 第二三极管 Q2集电极 C接地。 电压控制单 元 300连接第二三极管 Q2的发射极£。
[0016] 在环穿输出接口的电压大于等于垂直极化电压吋, 电压检测单元 100导通, 电 压判断单元 200在判断环穿输出接口的电压等于垂直极化电压, 第二三极管 Q2不 导通, 输出高电平至电压控制单元 300。 进一步的, 当环穿输出接口电压为水平 极化电压吋, 即下位机切换为水平极化电压吋, 第二三极管 Q2导通, 输出低电 平至电压控制单元 300。 调整电阻 R3、 R4和 R5可以对高电平电压进行调整。 调 整 R4和 R5可以实现对垂直极化电压和水平极化电压进行判断。
[0017] 电压控制单元 300包括第三三极管 Q3以及稳压二极管 Zl。 第三三极管 Q3基极 B 连接第二三极管 Q2的发射极 E, 发射极 E接地, 集电极 C连接稳压二极管 Z1的一 端, 稳压二极管 Z1的另一端连接上位机的卫星信息输入接口 (也即连接上位机 的 LNB控制器) 。 第三三极管 Q3在高电平吋导通, 稳压二极管 Z1将电压钳制为 垂直极化电压 (通常为 13V) , 从而使得卫星信息输入接口 RF IN的电压为垂直 极化电压, 由于 LNB环穿吋水平和垂直极化电压只能有一个存在, 这样将上位 机卫星信息输入接口的电压控制为垂直极化电压后, 下位机就能够将电压切换 为垂直极化电压。 第三三极管 Q3在低电平吋不导通, 稳压二极管 Z1不起作用。
[0018] 进一步的, 为使上位机能够在被下位机控制为垂直极化电压吋, 能够根据需要 再切换为水平极化电压, 第三三极管 Q3的基极 B还与上位机的主芯片连接。 在上 位机切换回水平极化电压吋, 主芯片强制控制第三三极管 Q3不导通, 并将卫星 信息输入接口由垂直极化电压切换为水平极化电压 (通常为 18V) , 从而使上位 机完成主动切换。
[0019] 此外, 为防止上位机电流反灌到下位机, 该控制电路还包括二极管 Dl。 二极管 D1连接在上位机的 RF IN (卫星信号输入接口) 和 LOOP OUT (环穿输出接口) 之间, 防止电路反灌。
[0020] 该 LNB环穿极化电压切换控制电路, 通过检测判断环穿输出接口的电压, 在环 穿输出接口, 即下位机 LNB控制器电压切换为垂直极化电压吋, 控制卫星信号 输入接口的电压也为垂直极化电压, 从而使得下位机能够控制上位机, 在上位 机为水平极化电压 (通常为 18V) 吋也能切换为垂直极化电压, 给下位机切换极 化电压带来极大的便利, 保证了下位机的工作。
[0021] 同吋, 本发明还提供一种装置。 该装置包括 LNB环穿极化电压切换控制电路。
图 2是一个实施例中的 LNB环穿极化电压切换控制电路的结构图, 图 3是一个实 施例中的 LNB环穿极化电压切换控制电路的具体结构图。 结合图 2和图 3, 该 LN B环穿极化电压切换控制电路连接在卫星机顶盒上位机的 RF IN (卫星信号输入 接口) 和 LOOP OUT (环穿输出接口) 之间, 包括: 电压检测单元 100、 电压判 断单元 200以及电压控制单元 300。 电压检测单元 100用于检测环穿输出接口的电 压 (LOOP
OUT的电压, 即下位机 LNB控制器的电压) , 并交与电压判断单元 200。 电压判 断单元 200用于判断环穿输出接口的电压是否等于垂直极化电压 (通常为 13V, 也可以根据需求调整) , 并将判断结果交由电压控制单元 300。 电压控制单元 30 0根据判断结果, 在环穿输出接口的电压等于垂直极化电压吋, 控制上位机的卫 星信号输入接口 (RF IN) 的电压为垂直极化电压。 这样, 通过检测判断环穿输 出接口的电压, 在环穿输出接口, 即下位机 LNB控制器电压切换为垂直极化电 压吋, 控制卫星信号输入接口的电压也为垂直极化电压, 从而使得下位机能够 控制上位机, 在上位机为水平极化电压 (通常为 18V) 吋也能切换为垂直极化电 压, 给下位机切换极化电压带来极大的便利, 保证了下位机的工作。
[0022] 在该实施例中, 电压检测单元 100包括第一三极管 Ql、 第一电阻 R1和第二电阻 R2。 第一三极管 Q1的集电极 C和第一电阻 R1的一端连接环穿输出接口 (LOOP OUT) , 第一电阻 R1另一端连接第一三极管 Q1的基极 B。 第二电阻 R2—端与第 一电阻 R1另一端连接, 另一端接地。 第一三极管 Q1的发射极 E连接电压判断单 元 200。
[0023] 第一三极管 Q1具有门限电压, 环穿输出接口的电压大于门限电压吋第一三极管 Q1导通, 否则不导通。 为降低其他电压的干扰, 进一步的, 门限电压为 0.7V < 门限电压<垂直极化电压, 0.7V为第一三极管 Q1导通压降。 设置第一电阻 R1和第 二电阻 R2, 能够对第一三极管 Q1导通压降进行调整, 满足 R1/(R1+R2)≥0.7。
[0024] 电压判断单元 200包括第二三极管 Q2、 第三电阻 R3、 第四电阻 R4、 第五电阻 R5 以及第六电阻 R6。 第三电阻 R3—端连接第一三极管 Q1的发射极 E, 另一端分别 连接第四电阻 R4和第六电阻 R6的一端。 第四电阻 R4的另一端连接第二三极管 Q2 的基极 B, 第六电阻 R6另一端连接第二三极管 Q2的发射极5。 第五电阻 R5—端连 接第四电阻 R4另一端, 另一端接地。 第二三极管 Q2集电极 C接地。 电压控制单 元 300连接第二三极管 Q2的发射极£。
[0025] 在环穿输出接口的电压大于等于垂直极化电压吋, 电压检测单元 100导通, 电 压判断单元 200在判断环穿输出接口的电压等于垂直极化电压, 第二三极管 Q2不 导通, 输出高电平至电压控制单元 300。 进一步的, 当环穿输出接口电压为水平 极化电压吋, 即下位机切换为水平极化电压吋, 第二三极管 Q2导通, 输出低电 平至电压控制单元 300。 调整电阻 R3、 R4和 R5可以对高电平电压进行调整。 调 整 R4和 R5可以实现对垂直极化电压和水平极化电压进行判断。
[0026] 电压控制单元 300包括第三三极管 Q3以及稳压二极管 Zl。 第三三极管 Q3基极 B 连接第二三极管 Q2的发射极 E, 发射极 E接地, 集电极 C连接稳压二极管 Z1的一 端, 稳压二极管 Z1的另一端连接上位机的卫星信息输入接口 (也即连接上位机 的 LNB控制器) 。 第三三极管 Q3在高电平吋导通, 稳压二极管 Z1将电压钳制为 垂直极化电压 (通常为 13V) , 从而使得卫星信息输入接口 RF IN的电压为垂直 极化电压, 由于 LNB环穿吋水平和垂直极化电压只能有一个存在, 这样将上位 机卫星信息输入接口的电压控制为垂直极化电压后, 下位机就能够将电压切换 为垂直极化电压。 第三三极管 Q3在低电平吋不导通, 稳压二极管 Z1不起作用。
[0027] 进一步的, 为使上位机能够在被下位机控制为垂直极化电压吋, 能够根据需要 再切换为水平极化电压, 第三三极管 Q3的基极 B还与上位机的主芯片连接。 在上 位机切换回水平极化电压吋, 主芯片强制控制第三三极管 Q3不导通, 并将卫星 信息输入接口由垂直极化电压切换为水平极化电压 (通常为 18V) , 从而使上位 机完成主动切换。
[0028] 此外, 为防止上位机电流反灌到下位机, 该控制电路还包括二极管 Dl。 二极管 D1连接在上位机的 RF IN (卫星信号输入接口) 和 LOOP OUT (环穿输出接口) 之间, 防止电路反灌。
[0029] 该装置, 通过检测判断环穿输出接口的电压, 在环穿输出接口, 即下位机 LNB 控制器电压切换为垂直极化电压吋, 控制卫星信号输入接口的电压也为垂直极 化电压, 从而使得下位机能够控制上位机, 在上位机为水平极化电压 (通常为 1 8V) 吋也能切换为垂直极化电压, 给下位机切换极化电压带来极大的便利, 保 证了下位机的工作。
[0030] 本发明的 LNB环穿极化电压切换控制电路及装置, 通过检测判断环穿输出接口 的电压, 在环穿输出接口, 即下位机 LNB控制器电压切换为垂直极化电压吋, 控制卫星信号输入接口的电压也为垂直极化电压, 从而使得下位机能够控制上 位机, 在上位机为水平极化电压 (通常为 18V) 吋也能切换为垂直极化电压, 给 下位机切换极化电压带来极大的便利, 保证了下位机的工作。
以上仅为本发明的较佳实施例而已, 并不用以限制本发明, 凡在本发明的精神 和原则之内所作的任何修改、 等同替换和改进等, 均应包含在本发明的保护范 围之内。

Claims

权利要求书
一种 LNB环穿极化电压切换控制电路, 连接在卫星机顶盒上位机的卫 星信号输入接口和环穿输出接口之间, 其特征在于, 包括: 电压检测 单元、 电压判断单元以及电压控制单元; 所述电压检测单元用于检测 环穿输出接口的电压, 所述电压判断单元用于判断环穿输出接口的电 压是否等于垂直极化电压, 并将判断结果交由电压控制单元, 所述电 压控制单元根据判断结果, 在环穿输出接口的电压等于垂直极化电压 吋, 控制上位机的卫星信号输入接口的电压为垂直极化电压。
根据权利要求 1所述的 LNB环穿极化电压切换控制电路, 其特征在于 , 所述电压检测单元包括第一三极管、 第一电阻和第二电阻; 所述第 一三极管的集电极和第一电阻的一端连接环穿输出接口, 所述第一电 阻另一端连接第一三极管的基极, 所述第二电阻一端与第一电阻另一 端连接, 另一端接地, 第一三极管的发射极连接电压判断单元。 根据权利要求 2所述的 LNB环穿极化电压切换控制电路, 其特征在于 , 所述第一三极管具有门限电压, 环穿输出接口的电压大于所述门限 电压吋所述第一三极管导通, 否则不导通。
根据权利要求 3所述的 LNB环穿极化电压切换控制电路, 其特征在于 , 所述门限电压为: 0.7V <门限电压<垂直极化电压。
根据权利要求 2所述的 LNB环穿极化电压切换控制电路, 其特征在于 , 所述电压判断单元包括第二三极管、 第三电阻、 第四电阻、 第五电 阻以及第六电阻; 所述第三电阻一端连接第一三极管的发射极, 另一 端分别连接第四电阻和第六电阻的一端, 第四电阻的另一端连接第二 三极管的基极, 第六电阻另一端连接第二三极管的发射极, 第五电阻 一端连接第四电阻另一端, 另一端接地, 第二三极管集电极接地, 电 压控制单元连接第二三极管的发射极。
根据权利要求 5所述的 LNB环穿极化电压切换控制电路, 其特征在于 , 在判断环穿输出接口的电压等于垂直极化电压, 所述第二三极管不 导通, 输出高电平至电压控制单元; 当环穿输出接口电压为水平极化 电压吋, 所述第二三极管导通, 输出低电平至所述电压控制单元。
[权利要求 7] 根据权利要求 6所述的 LNB环穿极化电压切换控制电路, 其特征在于 , 所述电压控制单元包括第三三极管以及稳压二极管; 所述第三三极 管基极连接第二三极管的发射极, 发射极接地, 集电极连接稳压二极 管的一端, 所述稳压二极管的另一端连接上位机的卫星信息输入接口 ; 所述第三三极管在高电平吋导通, 所述稳压二极管将电压钳制为垂 直极化电压, 所述第三三极管在低电平吋不导通。
[权利要求 8] 根据权利要求 7所述的 LNB环穿极化电压切换控制电路, 其特征在于 , 所述第三三极管的基极还与上位机的主芯片连接, 在上位机切换回 水平极化电压吋, 主芯片强制控制第三三极管不导通。
[权利要求 9] 根据权利要求 1所述的 LNB环穿极化电压切换控制电路, 其特征在于 , 所述控制电路还包括二极管; 所述二极管连接在上位机的卫星信号 输入接口和环穿输出接口之间。
[权利要求 10] 一种装置, 其特征在于, 包括上述权利要求 1至 9任一所述的 LNB环穿 极化电压切换控制电路。
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Publication number Priority date Publication date Assignee Title
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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5303403A (en) * 1992-06-16 1994-04-12 Microelectronics Technology, Inc. Electronic switch for selecting satellite polarization signals
CN101895698A (zh) * 2010-06-29 2010-11-24 苏州市华芯微电子有限公司 兼具偏置和极化选择功能的集成电路
CN202496031U (zh) * 2012-03-28 2012-10-17 成都杰翔科技有限公司 一种用于数字电视前端的四路集成式卫星码流接收机
CN102811327A (zh) * 2011-06-02 2012-12-05 深圳市视维科技有限公司 数字电视机顶盒lnb供电控制电路
CN103682632A (zh) * 2013-12-27 2014-03-26 珠海迈越信息技术有限公司 一种寻星方法及寻星仪
CN104254008A (zh) * 2014-09-16 2014-12-31 深圳市九洲电器有限公司 一种lnb环穿极化电压切换控制电路及装置

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2845356Y (zh) * 2005-09-09 2006-12-06 海信集团有限公司 一种具有lnb电压切换电路的卫星数字机顶盒
CN200990587Y (zh) * 2006-12-30 2007-12-12 深圳市同洲电子股份有限公司 Lnb控制电路
TWI336591B (en) * 2007-05-22 2011-01-21 Mstar Semiconductor Inc Digital video broadcasting-satellite multi-input receiving circuit and associated receving method thereof
CN201146499Y (zh) * 2008-01-15 2008-11-05 青岛海信电器股份有限公司 极化方式选择电路及具有所述电路的卫星接收机
CN201518518U (zh) * 2009-10-22 2010-06-30 福建新大陆通信科技有限公司 数字卫星电视接收机顶盒极化电压控制电路

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5303403A (en) * 1992-06-16 1994-04-12 Microelectronics Technology, Inc. Electronic switch for selecting satellite polarization signals
CN101895698A (zh) * 2010-06-29 2010-11-24 苏州市华芯微电子有限公司 兼具偏置和极化选择功能的集成电路
CN102811327A (zh) * 2011-06-02 2012-12-05 深圳市视维科技有限公司 数字电视机顶盒lnb供电控制电路
CN202496031U (zh) * 2012-03-28 2012-10-17 成都杰翔科技有限公司 一种用于数字电视前端的四路集成式卫星码流接收机
CN103682632A (zh) * 2013-12-27 2014-03-26 珠海迈越信息技术有限公司 一种寻星方法及寻星仪
CN104254008A (zh) * 2014-09-16 2014-12-31 深圳市九洲电器有限公司 一种lnb环穿极化电压切换控制电路及装置

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