JPH0771245B2 - AC / DC power transmission equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention transmits AC power and DC power having different voltages from one end of one transmission line in a time division manner, and At the other end, the AC power and the DC power are separated from each other, and a first device such as a booster for amplifying VHF / UHF television signals and a first device such as a BS-IF converter for receiving satellite broadcasting are separated from each other. The present invention relates to an AC / DC power transmission device that selectively supplies the two devices.

<Prior Art> Conventionally, for example, as shown in FIG. 5, a first high-frequency device (for example, VHF / UHF) to which AC power is supplied as operating power.
A television signal amplification booster) 2 and a second high-frequency device (for example, a BS-IF converter for satellite broadcasting reception) 4 to which DC power is supplied as operating power are provided, and the first and second When supplying high frequency signals to the receiving devices 21 and 41, it is necessary to provide independent transmission lines 22 and 42, respectively. In this case, an AC power supply that generates AC power with a voltage of 24 V, for example, is provided in the first receiving device 21, and this AC power is superimposed on the transmission line 22 and supplied to the first high-frequency device 2. . A rectifying / smoothing circuit is provided in the first high-frequency device 2, converts the transmitted AC power into DC power, and uses this as operating power.
In addition, a DC power supply that generates DC power of, for example, 15 V is provided in the second receiving device 41, and this DC power is superimposed on the transmission line 42 and used by the second high-frequency device 4 as its operating power. Supplied.

<Problems to be Solved by the Invention> As described above, in the related art, the high-frequency device 2, which mixes the AC power and the DC power having different voltages with one transmission line,
Since there is no technology for transmitting to the 4 side and separating AC power and DC power on the high frequency device side of the transmission line to supply to each high frequency device, when installing two high frequency devices 2 and 4, It was necessary to provide two transmission lines 22 and 42.

The high-frequency signals output from the high-frequency devices 2 and 4 are mixed by a mixer and transmitted through one transmission line, and at the receiving side, they are separated into individual high-frequency signals by a demultiplexer and supplied to the corresponding receiving devices. Although there is a system, in this case as well, for the same reason as described above, the operating power of the high-frequency device had to be selectively supplied to only one of the high-frequency devices via the transmission line. Therefore, in order to operate both the high-frequency devices at the same time, it is necessary to separately provide one dedicated power supply line for operation.

<Means for Solving Problems> An AC / DC power transmission device according to a first aspect of the present invention is a DC input terminal having a first input terminal to which AC power having a first voltage is supplied and a DC input having a second voltage. A second input terminal to which electric power is supplied, an output terminal coupled to one end of one transmission line, and the first terminal during a half cycle in which the AC power voltage has a polarity opposite to that of the DC power voltage. One input terminal is coupled to the output terminal to transmit the AC power through the transmission line, and the second input during a half cycle in which the voltage of the AC power has the same polarity as the voltage of the DC power. A time-division power transmission means including a switching circuit that operates to transmit the DC power through the transmission line by connecting a terminal to the output terminal; an input terminal coupled to the other end of the transmission line; First output terminal coupled to the second device, second A second output terminal coupled to the device, the input terminal and the first output terminal are coupled, and are conductive during the period in which the AC power is transmitted through the transmission line. The above first
A first diode adapted to supply to the first device via the output terminal of the device, and a DC power being transmitted via the transmission line, the DC power being transmitted between the input terminal and the second output terminal. And an AC / DC separating means including a second diode that is turned on during the predetermined period to supply the DC power to the second device via the second output terminal.

In the AC / DC power transmission device of the second invention, the first and second high-frequency devices are used as the first and second devices, respectively, and the first and second high-frequency devices supply the first and second high-frequency devices, respectively.
And a mixer for transmitting the mixed signal through one transmission line and a mixed signal transmitted from the mixer through the transmission line for receiving the mixed signal. A signal and a second high frequency signal, and supplies the first high frequency signal to the first receiving device and the second high frequency signal to the second receiving device. ing. The first input terminal of the time-divisional power transmission means is coupled to the first receiving device, and the AC power having the first voltage is supplied from the power source built in the first receiving device. , The second input terminal is coupled to the second receiving device, and the second input terminal is connected to the second power source built in the second receiving device.
DC power having a voltage of 3 is supplied, and the output terminal is coupled to the branch-side end of the transmission line. Also,
The input terminal of the AC / DC separating means is coupled to the end of the transmission line on the mixer side, the first output terminal is coupled to the first high-frequency device, and the second output terminal is the second output terminal.
Is coupled to high frequency equipment.

<Operation / Effect> In the AC / DC power transmission device described above, for example, the AC power for operating the first device having a voltage of 24 V is supplied from the AC power supply provided in the first receiving device to the first of the time-division transmission means. 1
Is supplied to the second input terminal of the time-divisional power transmission means from the DC power supply provided in the second receiving device, for example, the operating DC power of the second device having a voltage of 15V. It Due to the switching action of the switching circuit, the 24V AC power is supplied from the output terminal to the AC / DC separating means through the transmission line during the half cycle of the AC power voltage having a polarity opposite to that of the DC power voltage. At this time, the first diode of the AC / DC separating means conducts, and the AC power is supplied to the first device as its operating power. First
During the half-cycle period when the voltage of the AC power supplied to the input terminal of is the same polarity as the voltage of the DC power supplied to the second input terminal, the DC power of 15 V is AC from the output terminal through the transmission line. It is supplied to the DC separation means. At this time the second
The diode is turned on and the DC power is supplied to the second device as its operating power. Thus, according to the present invention, the AC power and the DC power having different voltages can be time-divisionally transmitted through the single transmission line.
The device and the second device can be operated at the same time. A smoothing circuit including a capacitor may be provided between the first diode and the first output terminal of the AC / DC separating means and between the second diode and the second output terminal, respectively. The circuit may be provided on the first device side and the second device side.

According to the present invention, when a VHF / UHF television signal amplification booster is used as the first device and a BF-IF converter for satellite broadcast reception is used as the second device, these boosters and converters operate simultaneously. Therefore, the first receiving device can simultaneously receive the VHF / UHF television broadcast and the second receiving device can simultaneously receive the satellite broadcast. Moreover, since two types of high-frequency signals and two types of operating power can be superimposed and transmitted on one transmission line, wiring work for a transmission line such as a coaxial cable is extremely simple.

<Embodiment> FIG. 1 is a block diagram for explaining the principle of the present invention. The first input terminal 16 of the time-divisional power transmission means 10 receives AC power having a first voltage from a device 12 with a built-in AC power supply. Supplied and second
The DC power having the second voltage is supplied to the input terminal 18 from the device 14 having a built-in DC power supply. Output terminal 20 is transmission line 8
Is connected to the input terminal 23 of the AC / DC separating means 6 via. The first output terminal 24 and the second output terminal 26 of the AC / DC separating means 6 are connected to the first device 2 and the second device 4, respectively.

FIG. 2 is a diagram showing a specific circuit example of the time-divisional power transmission means 10 and the AC / DC separation means 6, which is the first of the time-divisional power transmission means 10.
AC power of, for example, 24 V as shown in FIG. 4 (A) is supplied to the input terminal 16 from the device 12 with a built-in AC power source with reference to the potential at the reference point 19. The second input terminal 18 has the polarity shown in the capacitor 27 with reference to the potential of the reference point 19 from the device 14 with a built-in DC power supply, as shown in FIG.
DC power of 15V is supplied.

Explaining the operation of the switching circuit 31 of the time-divisional power transmission means 10, when the voltage of the AC power at the input terminal 16 rises to the positive side, the diode D1 becomes conductive and a current flows through the resistors R1 and R2. Fig. 4 (A) due to the voltage drop at R2
At t _{1 of} , the transistor T ₁ turns on. Transistor
When T1 is turned on, the resistance R4, R from the second input terminal 18
A current flows through the transistor 3 and the transistor T1, and the transistor T2 is also turned on due to the voltage drop of the resistor R4. D3 connected in parallel with the transistor T2 is a protection diode. At this time, the anode is connected to the reference point via resistor R5.
Since the trigger diode D2 connected to 19 is in the off state, the thyristor Sr is not triggered and remains in the off state. When the voltage of the AC power passes through the positive peak and drops, the base potential of the transistor T1 becomes lower than the potential required to keep the transistor T1 in the ON state at t ₂ in FIG. _{At 2} , the transistors T1 and T2 are both turned off. Accordingly, FIG. 4 (A) between the polarity of the AC power voltage is t ₁ ~t ₂ in the same period of positive half cycle the polarity of the DC power voltage in FIG (B) of the output terminal 20 A DC power of, for example, 15 V shown by P1 in FIG. 4C appears in the DC power supply, and the DC power is sent to the AC / DC separating means 6 via the transmission line 8. From t ₂ to t _{3 when} the voltage of AC power becomes 0, both thyristor Sr and transistor T2 are off, and the output terminal
20 goes to no voltage.

Trigger diode D2 in t ₃ when the polarity of the voltage of the AC power is inverted to turn on the thyristor Sr conducting. At this time, the diode D1 is in the reverse bias state and therefore is off, so that the transistors T1 and T2 are also off. Thus, during the period of t ₃ to t ₄ in which the voltage of the AC power of FIG. 4 (A) has the opposite polarity to the voltage of the DC power of FIG. 4 (B), the output terminal
In FIG. 20, an AC power having a negative voltage of, for example, 24 V shown by Q1 in FIG. 4C appears, and the AC power passes through the transmission line 8 and is
It is sent to the DC separation means 6.

As described above, during the half cycle in which the AC power voltage has the same polarity as the DC power voltage, DC power such as P1, P2, ... During the polarity half cycle, half cycle AC power such as Q1, Q2 ... In FIG. 4 (C) is transmitted through the transmission line 8.

In the AC / DC separating means 6, the first diode D4 is conducted while the AC power Q1, Q2 ... Is transmitted, and the AC power is supplied to the first device 2 from the first output terminal 24. It
A smoothing circuit including a capacitor is provided in the first device 2, and the half cycle AC power is smoothed and used as operating power. The smoothing circuit
It may be provided in the DC separating means. On the other hand, DC power P1, P2
... is transmitted, the second diode D5 conducts, this DC power is smoothed by the smoothing circuit composed of the capacitor 30, and the second output terminal 26 supplies the second device 4 with power for its operation. Supplied. In some cases, a smoothing circuit including the capacitor 30 may be provided in the second device 4.

FIG. 3 shows a second embodiment of the present invention, in which the device 2 is, for example, a VH.
F / UHF television broadcast signal amplification booster (first high-frequency device), 4 is, for example, a BS-IF converter (second high-frequency device) for satellite broadcast reception, and the high-frequency signal output from each of these high-frequency devices is a line. It is supplied to the mixer 48 via 44 and 46. The mixer 48 mixes the two types of high frequency signals and supplies the mixed signal to the duplexer 50 via the transmission line 8. The demultiplexer 50 separates the mixed signal into a first high-frequency signal and a second high-frequency signal, and passes the first high-frequency signal through the line 45 to VH.
First receiver 12 including F / UHF television receiver
And supplies the second high-frequency signal to the second receiving device 14 including the satellite broadcast receiver via the line 47. An AC power source for operating the first high frequency device 2 is provided in the first receiving device 12, and a DC power source for operating the second high frequency device 4 is provided in the second receiving device 14. Has been.

In this example, a high-frequency blocking low-pass filter composed of an inductor L1 and a capacitor C1 is provided on the first input terminal 16 side of the time-divisional power transmission device 10, and an inductor is provided on the second input terminal 18 side.
A high-frequency blocking low-pass filter consisting of L2 and L3 and capacitors C2 and C3, and inductors L4 and L5 on the output terminal 20 side.
And a high-frequency blocking low-pass filter composed of a capacitor C4 and a switching circuit of the device 10.
The high frequency signal is prevented from entering 31. Similarly, on the input terminal 23 side of the DC / AC separation means 6, an inductor L6,
A high frequency blocking low pass filter composed of L7 and capacitor C5, a high frequency blocking low pass filter composed of inductor L8 and capacitor C6 on the first output terminal 24 side, and inductors L9 and L10 on the second output terminal 26 side. Capacitors C7 and C
A high-frequency blocking low-pass filter that also functions as a smoothing circuit for the transmitted DC power P1, P2, etc., which is composed of 8 and 8, is provided to prevent high-frequency signals from entering the diodes D4 and D5. The operations of the time-divisional power transmission device 10 and the AC / DC separating means 6 are exactly the same as those in FIG. In the example of FIG. 3, the high frequency devices 2 and 4 can be simultaneously operated so that the receiving device 12 can simultaneously receive VHF / UHF television broadcasts and the receiving device 14 can simultaneously receive satellite broadcasts.

[Brief description of drawings]

FIG. 1 is a block diagram for explaining the principle of an AC / DC power transmission device according to the present invention, and FIG. 2 is an AC / DC power transmission device according to the present invention.
A circuit diagram of the main part of the first embodiment of the DC power transmission device, FIG. 3 is a circuit diagram of the main part of the second embodiment, and FIG. 4 is a description of the operation of the device of FIG. 2 and FIG. FIG. 5 is a block diagram showing an example of a conventional device. 6 ... AC / DC separation means, 8 ... Transmission line, 10 ... Time division transmission means, 16 ... First input terminal, 18 ... Second input terminal, 20 ... Output terminal, 23 ... … Input terminal, 24 …… First output terminal, 26 …… Second output terminal, 31 …… Switching circuit, 48 …… Mixer, 50 …… Splitter, D4 …… First diode, D5 ...... Second diode.

Claims (2)

[Claims] 1. A first input terminal to which AC power having a first voltage is supplied, a second input terminal to which DC power having a second voltage is supplied, and one end of one transmission line. An output terminal coupled to the output terminal, and the first input terminal is coupled to the output terminal during the half cycle of the AC power voltage having a polarity opposite to that of the DC power voltage to transfer the AC power. The voltage of the AC power is transmitted through a line, and the second input terminal is coupled to the output terminal during a half cycle in which the voltage of the AC power has the same polarity as the voltage of the DC power, and the DC power is transferred through the transmission line. A time-divisional power transmission means including a switching circuit that operates to transmit, an input terminal coupled to the other end of the transmission line, a first output terminal coupled to the first device, and a second device. Second output terminal, the above-mentioned input terminal and the first output terminal A power supply terminal, which is coupled to a power terminal and conducts during a period in which the AC power is transmitted via the transmission line to supply the AC power to the first device via the first output terminal. First to do
Of the diode and the input terminal and the second output terminal are coupled to each other to conduct the DC power during the period in which the DC power is transmitted through the transmission line, and to supply the DC power to the second power supply.
An AC / DC power transmission device comprising: AC / DC separating means including a second diode for supplying the second device through the output terminal of. 2. A first high-frequency signal supplied from a first high-frequency device and a second high-frequency signal supplied from a second high-frequency device are mixed, and the mixed signal is transmitted through one transmission line. Receiving a mixed signal transmitted from the mixer through the transmission line, separating the mixed signal into the first high-frequency signal and the second high-frequency signal, and dividing the first high-frequency signal into the first high-frequency signal. A demultiplexer for supplying the second high-frequency signal to the first receiving device and a second demultiplexer for supplying the second high-frequency signal to the second receiving device, and being incorporated in the first receiving device. A first input terminal, to which an AC power having a first voltage is supplied from an AC power supply, is coupled to the second receiving device, and is connected to the second receiving device from a DC power supply incorporated in the second receiving device. A second input terminal to which DC power having a voltage is supplied, the above-mentioned portion of the above-mentioned transmission line An output terminal coupled to the end on the device side, and the first input terminal coupled to the output terminal during a half cycle in which the voltage of the AC power has a polarity opposite to that of the voltage of the DC power. AC power is transmitted to the mixer side through the transmission line, and the second input terminal is coupled to the output terminal during a half cycle in which the voltage of the AC power has the same polarity as the voltage of the DC power. A time-divisional power transmission means including a switching circuit that operates to transmit the DC power to the mixer side via the transmission line, and an input terminal coupled to the mixer side end of the transmission line, A first output terminal coupled to the first high frequency device, a second output terminal coupled to the second high frequency device, coupled between the input terminal and the first output terminal, The AC power is transmitted through the transmission line. A first diode that conducts for a period of time to supply the AC power to the first high-frequency device via the first output terminal, and a coupling between the input terminal and the second output terminal. A second circuit for conducting the DC power through the transmission line and supplying the DC power to the second high-frequency device through the second output terminal during a period in which the DC power is transmitted.
AC / DC power transmission device comprising AC / DC separating means including the diode of.