KR0135996B1 - Lnb in satellite receiver - Google Patents

Abstract

According to the present invention, since the horizontal / vertical wave selection circuit of the conventional LNB is incompatible with the polarity level control method or the voltage level control method, in order to solve this problem, a selection signal according to the polarity level or the voltage level is detected and output. An OR gate in which a logic signal of a predetermined level is output when a signal of at least one of the first and second voltage detectors and an output signal of the first and second voltage detectors is generated, and a logic signal of a predetermined level of the OR gate Polarity level by implementing a horizontal / vertical wave selection circuit in a low-noise block of a satellite receiver composed of a horizontal / vertical wave driver which selectively selects and outputs a horizontal wave and a vertical wave according to a logic signal of an inversion level via an inverter. Alternatively, the vertical wave and the horizontal wave of the LNB according to the voltage level may be selectively switched and output.

Description

Horizontal / Vertical Wave Selection Circuits in Low Noise Blocks of Satellite Receivers

1 is a block diagram showing an embodiment of a horizontal / vertical wave selection circuit in a low noise block of a satellite receiver according to the prior art;

2 is a block diagram of another embodiment of a horizontal / vertical wave selection circuit in a low noise block of a satellite receiver according to the prior art;

3 is a block diagram showing an embodiment of a horizontal / vertical wave selection circuit in a low noise block of a satellite receiver according to the present invention;

4 is a detailed circuit diagram of FIG.

5 is a detailed circuit diagram of the vertical wave / horizontal wave deviation driving unit of FIG. 4;

FIG. 6 is a detailed circuit diagram of the vertical wave / horizontal wave deviation processor of FIG.

* Description of the symbols for the main parts of the drawings *

11, 21: LNB intermediate frequency amplifier 12, 22: voltage detector

13, 23: horizontal wave (H) drive unit 14, 24: vertical wave (V) drive unit

31, 32: first and second voltage detectors OR: ora gate

34: horizontal wave (H) / vertical wave (V) drive unit 45: vertical wave (V) deviation drive unit

46: vertical wave (V) deviation processing unit 47: horizontal wave (H) deviation driving unit

48: horizontal wave (H) deviation processing unit INV: inverter

R5 to R12: Resistance Q1, Q2: Transistor

FET: Field Effect Transistor

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a horizontal / vertical wave selection circuit in a plurality of low-noise blocks built into an antenna in a satellite video receiver (hereinafter, abbreviated as SVR), and more particularly, to a voltage level applied separately. The present invention relates to a horizontal / vertical wave selection circuit in a low noise block (hereinafter, abbreviated as LNB) of a satellite receiver applicable to both a control method and a polarity control method.

Recently, interest in satellite broadcasting that can receive information and culture from around the world is increasing day by day. In general, satellite broadcasting should receive extremely weak radio waves emitted from satellites orbiting the earth, so the antenna for receiving satellite broadcasting should have high gain, low noise, and be configured to receive a wide frequency band.

The antenna receives a vertical wave of a horizontal wave according to the rotation of the florizer. At this time, a predetermined driving voltage must be supplied to the LNB and the follower mounted on the antenna to tune the horizontal wave and the vertical wave.

On the other hand, the voltage level control method is to supply the vertical wave / horizontal wave by supplying 14V / 18V to the LNB, respectively, and the polarity control method is to supply + 12V / -12V to the LNB, respectively, to receive the horizontal / vertical wave Receive. Therefore, the present invention will be described with respect to the LNB dual input control circuit suitable for the two methods.

1 is a circuit diagram illustrating an embodiment of a horizontal wave / vertical wave selection circuit in a low noise block of a satellite receiver according to the prior art.

Referring to FIG. 1, the horizontal wave / vertical wave selection circuit receives a tuning voltage of 14V / 18V and detects a control voltage, and a vertical wave when 14V is detected by the voltage detector 12. A vertical wave (V) driver 14 for outputting (V), a horizontal wave (H) driver 13 for outputting a horizontal wave (H), and a vertical wave (V) The LNB intermediate frequency amplifier 11 is configured to amplify and output the frequency according to the output of the horizontal wave H. Therefore, this method is applied to the LNB according to the voltage level control method.

2 is a circuit diagram of another embodiment of a horizontal / vertical wave selection circuit in a low noise block of a satellite receiver according to the prior art.

Referring to FIG. 2, the horizontal wave selection circuit receives a tuning voltage of + 12V / -12V and detects a control voltage, and when the voltage detector 22 detects + 12V, the horizontal wave selection circuit receives a horizontal wave. Horizontal wave (H) driver 23 for outputting (H), vertical wave (V) driver (24) for outputting vertical wave (V), and a separate power supply voltage (10) LNB intermediate frequency amplifier 21 for amplifying and outputting the frequency according to the output of the horizontal wave H and the vertical wave V is provided. Therefore, this method is applied to the LNB according to the polarity control method.

However, according to the conventional horizontal / vertical wave selection circuits configured and operated as described above, they are incompatible because they are applicable only to either of the voltage control method and the polarity control method, respectively.

Accordingly, an object of the present invention is to solve the above disadvantages, and an object of the present invention is to select a horizontal / vertical wave selection circuit in a low noise block of a satellite receiver, which is applicable to both the voltage control method and the polarity control method of the LNB. In providing.

A feature of the horizontal / vertical wave selection circuit in the low noise block of the satellite receiver according to the present invention for achieving the above object is that the first and second output signals are respectively detected and output according to the polarity level or the voltage level. The OA gate outputs a logic signal of a predetermined level when at least one signal of the voltage detector, the output signal of the first and second voltage detectors is generated, and the logic signal of the OA gate and the logic signal of the OA gate. It is composed of a horizontal wave / vertical wave driver for selecting and outputting the horizontal and vertical waves according to the logic signal of the inversion level.

The horizontal / vertical wave driving unit of the horizontal / vertical wave selecting circuit in the low noise block of the satellite receiver according to the present invention includes a vertical wave deviation driving unit and a horizontal wave deviation driving unit respectively connected to an output terminal of an OR gate and an inverter; A vertical wave deviation processing unit and a horizontal wave deviation processing unit respectively connected to the vertical wave and horizontal wave deviation driving units.

Hereinafter, a preferred embodiment of a horizontal / vertical wave selection circuit in a low noise block of a satellite receiver according to the present invention will be described in detail with reference to the accompanying drawings.

3 is a block diagram showing an embodiment of a horizontal / vertical wave selection circuit in a low noise block of a satellite receiver according to the present invention.

Referring to FIG. 3, the horizontal wave / vertical wave selection circuit includes a first signal in which a selection signal according to a polarity level or a voltage level is detected and output as power voltages (+ 12V / -12V and 14V / 18V) are respectively applied. And a logic signal of a predetermined level is output when at least one signal of the second voltage detectors 31 and 32 and the output signals of the first and second voltage detectors 31 and 32 is generated. A horizontal wave (H) and a vertical wave (V) are selected and output according to a logic signal of a predetermined level of the gate OR, the OR gate, and an inverted level logic signal via an inverter (not shown). And a horizontal / vertical wave driver 34.

In addition, the horizontal / vertical wave driver 34 is a vertical wave deviation driver 45 and a horizontal wave connected to the output terminals of the OR gate and the inverter INV, respectively, as shown in the detailed circuit diagram of FIG. It consists of the deviation drive part 47, the vertical wave deviation processing part 46 and the horizontal wave deviation processing part 48 connected to the said vertical wave and horizontal wave deviation drive parts 45 and 47, respectively.

In addition, the first voltage detector 31 connected to the two input terminals of the OR gate OR includes a constant voltage diode D1, resistors R1 to R3 connected in parallel to the diode D, and the resistance. A capacitor c1 connected in parallel with each other between R2 and R3; The second voltage detector 32 includes an LC circuit composed of an inductance L1 and a capacitor C2, a constant voltage zener diode ZD1 connected to an output terminal of the LC circuit, and an output terminal of the zener diode ZD1 in parallel. The resistors R4 and R5 are connected to each other.

In addition, the vertical wave / horizontal wave deviation driving unit includes resistors R6 and R7 so that a predetermined switching voltage is output according to the logic signal levels of the OR gate OR and the inverter INV, as shown in FIG. It consists of the self bias circuit by transistor Q1.

In addition, as shown in FIG. 6, the vertical wave / horizontal wave deviation processing unit is operated according to the switching voltage of the vertical wave / horizontal wave deviation driving unit, and is self-biased by the resistors R8 to R10 and the transistor Q2. A circuit, a field effect transistor FET1 for amplifying and outputting an RF signal according to a bias voltage of the self bias circuit, a collector and emitter terminal of the transistor Q1, and gates and drains of the field effect transistor FET1. The resistors R11 and R12 connected to the terminals are respectively grounded.

The effects of the horizontal / vertical wave selection circuit in the low noise block of the satellite receiver according to the present invention configured as described above will be described with reference to FIGS. 4 to 6 as follows.

First, when a power supply voltage (+ 12V / -12V) is applied to the first voltage detector 31, the constant voltage diode D1 is turned on at + 12V, and the + 12V voltage is applied to the resistor R1 (R2). By dividing by 5V and outputting at 5V, the OR gate outputs a high level, and when it is -12V, the high level is output.

Next, when the power supply voltage (14V / 18V) is applied to the second voltage detector 32, the constant voltage zener diode ZD1 is turned on when the voltage passing through the LC circuit is 18V, and when the voltage is 14V, the constant voltage zener diode ZD1 is ) Is off. Therefore, OR gate outputs low level only when 14V is applied.

On the other hand, according to the polarity level and the voltage level detection operation of the first and second voltage detection unit 31 is applied to the second voltage detection unit 32 when detecting the polarity level to which the power supply voltage (+ 12V / -12V) is applied. When the power supply voltage is fixed at 14V, the OR gate outputs the horizontal wave detection signal at high level 5V and the vertical wave detection signal at low level 0V, respectively.

In addition, assuming that no voltage is applied to the first voltage detector 32 when detecting the voltage level to which the power supply voltage 14V / 18V is applied, the OR signal OR at the high level is 5V at 5V at the high level. The vertical wave detection signal (when applying 14V) at 0V at the low level.

Therefore, the horizontal wave / vertical wave driver 34 selects and outputs the horizontal wave H or the vertical wave V, as shown in Table 1 below.

TABLE 1

In other words, when the logic signals of the OR gate OR and the inverter INV are high level (A: 5V) and low level (A ': 0V), the vertical wave deviation driver 45 and the horizontal wave deviation driver 47 ) Is output at low level (B: 0V) and high level (B ': 5V), so the horizontal wave deviation processing unit 48 is operated, and the vertical wave deviation processing unit 46 is stopped to output horizontal waves. ; When the logic signals of the OR gate and the inverter INV are low level (A: 0V) and high level (A ': 5V), the output of the vertical wave deviation driver 45 and the horizontal wave deviation driver 47 Is output at a high level (B: 5V) and a low level (B ': 0V), and thus the vertical wave deviation processing unit 46 is operated, and the horizontal wave deviation processing unit 48 is stopped to output vertical waves.

Therefore, in the horizontal / vertical wave selection circuit, as the power supply voltages (+ 12V / -12V and 14V / 18V) are applied, the selection signal according to the polarity level or the voltage level is detected as shown in Table 1, respectively. ) Or vertical wave V is selectively switched and output.

As described above, according to the horizontal / vertical wave selection circuit in the low noise block of the satellite receiver according to the present invention, first and second voltage detectors for detecting and outputting a selection signal according to polarity level or voltage level, respectively, OR gate outputting a logic signal of a predetermined level when at least one of the output signals of the first and second voltage detectors is generated, logic signal of a predetermined level of the OR gate and an inversion level logic via an inverter It is composed of a horizontal wave / vertical wave driver for selectively outputting the horizontal wave and the vertical wave in accordance with the signal to selectively output the vertical wave and the horizontal wave of the LNB according to the polarity level or the voltage level.

Therefore, the horizontal / vertical wave selection circuit in the low noise block of the satellite receiver according to the present invention is compatible with any of the voltage control method and the polarity control method of the LNB, and therefore, there is an advantage suitable for the selection signal output circuit of the LNB.

Claims (2)

The logic signal of a predetermined level is generated when at least one of the first and second voltage detectors for detecting and outputting a selection signal according to the polarity level or the voltage level and the output signal of the first and second voltage detectors is generated. A satellite receiver comprising a horizontal wave / vertical wave driver for outputting a horizontal wave and a vertical wave according to an output ora gate and a logic signal of a predetermined level of the ora gate and an inverted level logic signal via an inverter Horizontal / vertical wave selection circuit in low noise block The horizontal wave / vertical wave driving unit is a vertical wave deviation driving unit and a horizontal wave deviation driving unit respectively connected to an output terminal of an OR gate and an inverter, and a vertical wave connected to the vertical wave and horizontal wave deviation driving unit, respectively. A horizontal / vertical wave selection circuit in a low noise block of a satellite receiver, characterized by comprising a deviation processing unit and a horizontal wave deviation processing unit.