JP3418491B2 - Polarization switch - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to antenna control of satellite receiving equipment.

[0002]

2. Description of the Related Art Radio waves from artificial satellites are sent in both vertically polarized waves and horizontally polarized waves in order to effectively use the waves. Therefore, it is necessary to have a mechanism for switching the polarization for both the satellite broadcasting receiver and the antenna.

FIG. 3 is a basic configuration diagram thereof. Reference numeral 1 denotes a satellite broadcasting receiving antenna for receiving satellite broadcasting, and a low noise converter (hereinafter referred to as LNB) 2 outputs a vertically polarized received signal to a terminal 2a and a horizontally polarized received signal to another terminal. Both are output simultaneously from the terminal 2b. Reference numeral 3 denotes a satellite broadcast receiver which inputs a vertically polarized reception signal into the terminal 3a and inputs a horizontally polarized reception signal from another terminal 3b.

In this configuration, the satellite broadcast receiver 3 requires two input terminals 3a and 3b, and two coaxial cables 4 are required.
The LNB 2 and the satellite broadcast receiver 3 must be connected by a and 4b.

The first method of making the number of input terminals of the satellite broadcast receiver one is the configuration diagram of FIG. The satellite broadcast receiving antenna 1 and its LNB 2 are the same as in FIG. The satellite broadcast receiver 5 of this example has a control signal terminal 5a separately from the reception signal input terminal 5b. Reference numeral 6 denotes a coaxial switch, which switches between vertical polarization and horizontal polarization by a switching signal from the control signal terminal 5a of the satellite broadcast receiver 5 and outputs a designated reception signal to the terminal 6a. A coaxial cable 7 connects the terminals 6a and 5b.

In this structure, the coaxial switching device 6 selects only the polarized wave of interest by the control signal from the satellite broadcast receiver 5 and inputs it to the satellite broadcast receiver 5. As a driving method of the coaxial switching device 5, there are a method of using a control voltage for switching the voltage in accordance with the switching of the polarization and an electromagnetic method of switching by the LNB 2 itself according to the polarity of the current.

The second method is the block diagram of FIG. The LNB 9 of the satellite broadcast receiving antenna 8 of this example switches and outputs the vertically polarized wave and the horizontally polarized wave depending on the difference in the supplied power supply voltage value. The satellite broadcast receiver 10 is configured to switch the supply voltage to the LNB 2 for switching the polarization. Reference numeral 4 is a coaxial cable for connecting the high frequency signal output line of the LNB 2 and the high frequency signal input line of the satellite broadcast receiver 10.

[0008]

In the prior art, in any of the examples shown in FIGS. 3, 4, and 5, the combination of the LNB and the satellite broadcast receiver is fixed, and there is no degree of freedom in combination.

The configuration of FIG. 3 requires a satellite broadcast receiver having two input terminals and two coaxial cables. However, in installation, it is desired that the number of cables to be connected be as small as possible.

In the configuration of FIG. 4, two coaxial cables or one coaxial cable and a control signal line are required between the LNB and the satellite broadcast receiver, and the number of connecting cables is large as in FIG. However, conventionally, this method has been used,
Many satellite broadcast receivers of this method are used.

In the configuration of FIG. 5, the connection can be made with only one coaxial cable, and the configuration can be simplified. Future L
This format is becoming popular in NB. However, it was not possible to combine the receiver for outputting the control signal in FIG. 4 and the LNB for switching the polarization by the voltage supplied to the LNB in FIG.

The present invention outputs a control signal for switching the polarization and a satellite broadcast receiver that cannot change the supply voltage to the LNB for switching the polarization, and a vertical polarization and a horizontal polarization. An object of the present invention is to provide a polarization switching device that can be operated by combining LNBs that are switched and output depending on the difference in the supplied power supply voltage value.

[0013]

[Means for Solving the Problems ] To solve the above problems
In the polarization switching device according to claim 1 of the present invention, a control signal for superimposing a power supply voltage for a low noise converter on a high frequency signal input line and outputting the control signal and switching the polarization of a received signal is used for the high frequency signal input line. Low noise of satellite broadcasting receiver that outputs to another control signal terminal and satellite receiving antenna that switches the polarization of the received signal according to the power supply voltage supplied to the high-frequency signal output line from the outside via the high-frequency cable A polarization switching device connected between the converter and
Wherein a high frequency signal input line of the LNB of the high-frequency signal output lines the Mamoru <br/> Review broadcast receiver and the received signal supply line to the high-frequency connecting, the received signal supply line
And the low-noise converter
Terminal for connection to the high-frequency signal output line of
It has a terminal for connection to the high frequency signal input line of the receiver,
High frequency signal output line connection terminal of the low noise converter
Is connected to one end of the capacitor via the first inductor.
High frequency signal input to the satellite broadcast receiver
The line connection terminal is connected to the second end of the second end of the capacitor.
Equipped with a polarization switching voltage switching unit connected via a connector
Well, the high frequency signal is transmitted by the capacitor.
In the by-polarized-wave changeover voltage switching unit, a high-frequency signal of the first-in to the output line of the power supply voltage from the high-frequency signal input lines of the satellite receiver the LNB
A first switching state supplied via a ducter, and a second inductor from a high frequency signal input line of the satellite broadcast receiver.
Wherein the LNB frequency signal output line power supply voltage supplied via the Kuta and voltage conversion first Lee
It is characterized in that it has to obtain conversion-away in response to a control signal of the control signal terminal a second in the switching state for supplying through the inductor.

According to a second aspect of the present invention, there is provided a polarization switching device according to the first aspect , wherein a change in voltage of a control signal is generated.
Corresponding to both changes in current, the first switching state and the second switching state.
It is designed to be able to switch between
The control signal input section that receives the control signal from the control signal terminal of the satellite broadcast receiver is equipped with a control signal that has a resistor and a diode that cause a voltage drop due to the supplied current or voltage.
It is configured as a signal input section and includes a Zener diode and a transformer.
Vertical / horizontal format with a short circuit detection function composed of transistors
It is designed to be input as a voltage change in the constant section.
is there. Output from the control signal terminal of the satellite broadcasting receiver
The control signal supplied to the control signal input section is a change in current.
Whether it is a voltage change or a voltage change,
Output from the control signal input section for switching the polarization
The control signal supplied from the control signal input section to the voltage switching section.
It is characterized in that the polarization switching voltage switching section is switched between a first switching state and a second switching state by pressure .

A polarization switching device according to a third aspect of the present invention is the polarization switching device according to the first aspect.
According to a second aspect of the present invention, there is provided a protection circuit that detects a state in which the voltage level of the high-frequency signal output line of the low noise converter is lower than a specified value and switches to the first switching state.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIG.
Will be described with reference to FIG. FIG. 1 shows a polarization switching device of the present invention interposed between the satellite broadcast receiver 5 shown in FIG. 4 and the LBN 9 shown in FIG. FIG. 2 shows the specific circuit configuration.

The terminal 11 is connected to the reception signal input terminal 5b of the satellite broadcast receiver 5 by a coaxial cable, and the terminal 12 is LB.
It is connected to the high frequency signal output line of N9 by a coaxial cable. The terminals 11 and 12 are connected at high frequencies by a capacitor 13. The terminal 14 is connected to the control signal terminal 5a of the satellite broadcast receiver 5.

The polarization switching device includes a control signal input section 15 composed of a diode and a resistor, a vertical / horizontal determination section 16 composed of a Zener diode and a transistor having a short circuit detection function, and a voltage of 15 volts. It is composed of a voltage conversion section 17 for converting to 11 volts, a voltage switching section 18 composed of a relay RY and a transistor for switching the power supply voltage sent to the LBN 9 to 15 or 11 volts.

The satellite broadcast reception wave is input from the LNB 9 to the terminal 11, and the satellite broadcast reception is connected from the terminal 11 to the satellite broadcast receiver 5 via the capacitor 13 having a sufficiently low impedance with respect to the band. Power to the LNB 9 is input from the satellite broadcast receiver 5 to the terminal 11 and output from the terminal 16 as follows. The polarization switching control signal from the satellite broadcast receiver 5 is input to the control signal input unit 15. When the polarization switching control signal is a voltage change, the same voltage as the input is output to the output of the control signal input unit 15. When the polarization switching control signal is a change in current, the current flows through the resistor 19,
At this time, a voltage proportional to the current is generated across the resistor,
The voltage is output to the output of the control signal input unit 15. That is, both the change in current and the change in voltage are output as the change in voltage. The polarization control signal that has changed in voltage is input to the vertical / horizontal determination unit 16, where it is determined whether the supply voltage to the LNB 9 is for horizontal polarization or vertical polarization by turning on / off the transistor. .

On the other hand, L output from the satellite broadcast receiver 5
The power supply to NB9 is 15 volts. This power source is supplied from the input terminal 11 to the voltage switching unit 18 via the inductor 20 having an impedance sufficiently high with respect to the satellite broadcast receiving band.

The voltage switching unit 18 outputs the 15-volt power supply voltage supplied from the satellite broadcast receiver 5 as it is.
And a second switching state in which the voltage converting unit 17 converts the voltage into 11 volts and outputs the voltage. The first switching state and the second switching state are switched according to the result of the vertical / horizontal determination unit 16. To be In this embodiment, the relay contacts S1, S
The state in which 2 is switched to the lower side is the first switching state, and the state in which the relay contacts S1 and S2 are switched to the upper side is the second switching state.

The output voltage of the voltage switching unit 18 is an inductor 2 having a sufficiently high impedance with respect to the satellite broadcast reception band.
It is applied to the terminal 12 via 1 and is output from the polarization switching device. Further, the output voltage of the voltage switching unit 18 is connected to the vertical / horizontal determination unit 12. The vertical / horizontal determination unit 12 has a Zener diode 22, and a voltage lower than the output voltage by the Zener voltage is used as a switching signal of the voltage switching unit 16. Without this Zener diode, the voltage switching section 18 would normally switch until the output voltage drops to near 0 volts. However, when there is a Zener diode, the voltage of the vertical / horizontal switching unit 16 becomes a voltage obtained by subtracting the Zener voltage from the output voltage. Therefore, when the output voltage drops to near the Zener voltage, It becomes almost 0 volt. Therefore, the relay of the voltage switching unit 18 is switched to the through side of 15 volts.

As a result, when the output is completely short-circuited and becomes 0 volt, or when the output is short-circuited with a low resistance and becomes lower than the Zener voltage, the protection operation is activated and the voltage switching portion 18 is switched to the 15-volt side and the internal circuit. The overcurrent does not flow and can be protected.

Radio waves received from the LNB 9 are connected to the satellite broadcast receiver 5 through the condenser 13. As described above, by using the polarization switching device of this embodiment, the satellite broadcast receiver 5 shown in FIG. 4 and the LBN 9 shown in FIG. 5 can be used in combination.

By providing the control signal input section 15, the LBN 9 can be used in combination regardless of whether the control signal format of the satellite broadcast receiver 5 is voltage type or current type.

Further, by using the protection circuit composed of the Zener diode 22 and the like, even if a short circuit accident occurs during construction, the internal circuits such as the voltage conversion unit 17 can be protected.

[0027]

According to the first aspect of the present invention, the received signal supply line for connecting the high frequency signal output line of the low noise converter and the high frequency signal input line of the satellite broadcast receiver in high frequency, and the satellite broadcast receiver. The first switching state in which the power supply voltage from the high-frequency signal input line is supplied to the high-frequency signal output line of the low-noise converter and the high-frequency signal of the low-noise converter by voltage-converting the power-supply voltage from the high-frequency signal input line of the satellite broadcast receiver. Since the second switching state for supplying to the output line and the voltage switching section for switching according to the control signal at the control signal terminal are provided, the voltage supplied to the receiver with the polarization switching control signal output device and the low noise converter. It is possible to combine the antennas with built-in polarization switching, and to effectively use the assets already owned.

According to a second aspect of the present invention, in the first aspect, the control signal input section that receives the control signal from the control signal terminal of the satellite broadcast receiver is provided with a resistor that causes a voltage drop due to the supplied current or voltage. Since it is provided, it is possible to switch between the first switching state and the second switching state corresponding to both the voltage change type and the current change type of the control signal at the control signal terminal of the satellite broadcast receiver.

According to the third aspect of the present invention, in the first and second aspects, the state in which the voltage level of the high-frequency signal output line of the low noise converter is lower than the specified value is detected.
Since a protection circuit for switching to the switching state is provided, the internal circuit can be protected even if a short-circuit accident occurs during construction.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a specific circuit diagram of the same embodiment.

FIG. 3 is a configuration diagram of horizontal polarization and vertical polarization reception according to a conventional technique.

FIG. 4 is a configuration diagram of horizontal polarization and vertical polarization switching reception according to a conventional technique.

FIG. 5 is a configuration diagram of horizontal polarization and vertical polarization switching reception according to a conventional technique.

[Explanation of symbols]

8 satellite broadcasting receiving antenna 9 low noise converter 5a control signal terminal 5b receiving signal input terminal 5 satellite broadcasting receiver 11 connection terminal with high frequency signal input line of satellite broadcasting receiver 12 connection terminal with high frequency signal output line of low noise converter 13 Capacitor 14 Connection Terminal with Control Signal Terminal of Satellite Broadcast Receiver 15 Control Signal Input Section 16 Vertical / Horizontal Judgment Section 17 Voltage Conversion Section 18 Voltage Switching Section 19 Resistor 22 Zener Diode RY Relay

─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-8-288874 (JP, A) JP-A-61-247131 (JP, A) JP-A-5-268608 (JP, A) JP-A-4- 363987 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H04B 1/18 H04H 1/00 H04J 11/00

Claims (3)

(57) [Claims] 1. A satellite which outputs a control signal for superimposing a power supply voltage for a low noise converter on a high frequency signal input line and outputting a control signal for switching the polarization of a received signal to a control signal terminal different from the high frequency signal input line. Polarization switching connected between the broadcast receiver and the satellite receiver antenna low noise converter that switches the polarization of the received signal according to the power supply voltage supplied to the high-frequency signal output line from the outside via the high-frequency cable. a vessel, the received signal supply lines, wherein the connecting the LNB of the high-frequency signal output line and the high-frequency signal input line of said satellite receiver high-frequency manner,
Capacitor inserted in the received signal supply line
And to the high frequency signal output line of the low noise converter
The connection terminal and the high frequency signal input line of the satellite broadcast receiver.
Has a terminal for connecting to the
The wave signal output line connection terminal is connected to one end of the capacitor
1 through the inductor and the satellite
The high-frequency signal input line connection terminal of the transceiver is
Polarization connected to the other end of the sensor via the second inductor
It is equipped with a switching voltage switching unit,
Wave signal is transmitted, and the polarization switching voltage switching unit is also provided.
Accordingly, the first and the switching state for supplying a power supply voltage from the high-frequency signal input lines of the satellite receiver via the first inductor to the high-frequency signal output lines of said LNB, the satellite receiver a high-frequency signal power supply voltage supplied via the second inductor from the input line to the voltage converting the LNB of the second supply via said first inductor to the high-frequency signal output line
Polarized-wave exchanger that of the the switching state, characterized in that to obtain <br/> cutting conversion in response to a control signal of the control signal terminals. 2. A control composed of a diode and a resistor.
The signal input section, Zener diode and transistor
It is equipped with a vertical / horizontal judgment unit that has a short circuit detection function.
For example, the system output from the control signal terminal of the satellite receiver
The control signal supplied to the control signal input section is a change in current
Whether it is a voltage change or a voltage change
Is output from the control signal input section, and the polarization switching power is output.
Pressure switching unit to supply control voltage from the control signal input section
Thus, the polarization switching voltage switching unit can switch between the first switching state and the second switching state.
The polarization switching device according to claim 1, wherein: 3. A first condition is detected when a voltage level of a high frequency signal output line of a low noise converter is lower than a specified value.
The polarization switching device according to claim 1 or 2, further comprising a protection circuit for switching to the switching state.