JP2000115014A - Power supply device of radio system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the power supply device of the radio system which prevents different kind of machines from being misconnected and does not supply electric power to necessary places of a high-frequency part when a voltage outside a prescribed range is inputted to a high-frequency part as a radio system which has its control part and high-frequency part connected and supplies electric power from the control part to the high-frequency part. SOLUTION: The radio system which supplies the operating power to the high-frequency part 2 from the control part 1 is equipped with a low-voltage supply means 11 which supplies a predetermined low voltage lower than a specific source voltage from the control part to the high-frequency part when the radio system is started up, a command transmitting means 13 which sends a given initial setting command for machine kind matching from the control part to the high-frequency part in the low-voltage state, a boosting means 11a which boosts the low voltage supplied from the control part to the high-frequency part to a predetermined high voltage when an answer to the initial setting command is sent back from the high-frequency part within a given time, and a power supply control means 22 which decides whether or not the high voltage inputted to the high-frequency part is within a prescribed range and applies the high voltage to the high-voltage reception part 26 of the high-frequency part only when the high voltage is in prescribed range.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an FPU (Field P)
The present invention relates to a power supply device for a wireless system such as a pickup unit, and more specifically, to an initial setting when starting to supply power from the control unit to the high frequency unit in a wireless system configured as a set of a control unit and a high frequency unit. The present invention relates to a wireless system power supply device having features.

[0002]

2. Description of the Related Art In a radio system for transmitting and receiving video and audio by radio waves, for example, a radio system used for mobile relay of a television, a video signal and an audio signal are taken into consideration in consideration of the portability, mobility and operability of the device. Is converted into an intermediate frequency, and a high-frequency unit that converts an intermediate-frequency signal into a radio frequency and transmits it as a radio wave from a parabolic antenna or the like is separated into units, and the separated control unit and the high-frequency unit are separated. One set constitutes a wireless system.

When such a unit-separated type radio system is used, for example, mounted on a broadcast van, the high-frequency unit is mounted on a tripod together with a parabolic antenna on a tripod, and the control unit is mounted inside the vehicle. They are installed in control rooms. For this reason, in the unit-separated wireless system, the power supply of the high-frequency unit installed outdoors is connected to the control unit via a cable or is superimposed on a coaxial cable for signal transmission connecting the control unit and the high-frequency unit. It is usually powered.

In the above-described unit-separated wireless system, when a plurality of wireless systems of different models are prepared, a control unit of a different model and a high-frequency unit may be erroneously connected. . When the control unit and the high-frequency unit of different models are connected in this way, a problem is particularly caused when the power supply voltages of both are the same or the power supply voltage of the control unit is lower than the power supply voltage required by the high-frequency unit. However, if the power supply voltage on the control unit side is higher than the power supply voltage required on the high frequency unit side, the high voltage may destroy the high frequency unit.

Accordingly, the present applicant has disclosed in Japanese Patent Application Laid-Open No. 9-1816.
No. 20 proposes a method for solving the above problem. After connecting the control unit and the high-frequency unit with a cable, when the wireless system starts up, the control unit supplies a predetermined low voltage lower than a predetermined power supply voltage to the high-frequency unit, and simultaneously controls Unit transmits a predetermined initial setting command for model comparison to the high frequency unit, and when a response to the initial setting command is returned from the high frequency unit within a predetermined time, the low voltage supplied from the control unit to the high frequency unit. Is boosted and supplied as a predetermined power supply voltage.

[0006]

The connection between the control section and the high frequency section is generally made using a coaxial cable having a DC resistance of 1.6Ω / 100m of 5D-2W, and an IF signal, a power supply current and a command are connected to the coaxial cable. The signal superimposed is passed. In the case of the above-mentioned method proposed by the present applicant, the current flowing through the coaxial cable at the time of command collation is about 0.2 A. Therefore, when the cable length is 100 m, the voltage drop is 1.6 × 0.2 × 1 = 0. 1.6 × 0.2 × 3 = 0.9 for 32V and 300m cable length
1.6 x 0.2 x for 6V, 500m cable length
5 = 1.6 V and the voltage drop is small, so that no problem occurs in the command collation operation.

However, when a high voltage is supplied and the high frequency section is operated after command collation, if the steady current of the high frequency section is 4 A, the voltage drop when the cable length is 100 m is 1.6 × 4 × 1 = When the cable length is 6.4 V and the cable length is 300 m, 1.6 × 4 × 3 = 19.2 V and the cable length is 50.
In the case of 0 m, the voltage is 1.6 × 4 × 5 = 32 V, and depending on the length of the cable, the input voltage of the high-frequency unit may be lower than the specified value.

When the power supply voltage input to the high frequency section falls below a specified value, the operation may become unstable due to an abnormal bias voltage of the stabilized power supply in the high frequency section. There is a method of raising the voltage on the side, but if the coaxial cable used is short,
This time, the input voltage of the high-frequency section exceeds the specified value, and the stabilized power supply provided in the high-frequency section may be damaged, or the output voltage of the stabilized power supply may damage the circuit that supplies power from the stabilized power supply. There is a risk that it will. In this case, there is a method of increasing the allowable range of the input voltage of the stabilized power supply in the high frequency section, but there is a problem that the cost is significantly increased.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a wireless system in which a control unit and a high-frequency unit are connected to supply power from the control unit to the high-frequency unit. An object of the present invention is to provide a power supply device for a wireless system in which power is not supplied to a required portion of a high frequency unit when a voltage is input.

[0010]

Means for Solving the Problems To solve the above problems, the present invention employs the following means. That is,
According to a first aspect of the present invention, there is provided a wireless system comprising a high-frequency unit for transmitting or receiving a radio wave, and a control unit for controlling the high-frequency unit, wherein an operation power supply for the high-frequency unit is supplied from the control unit. A low-voltage supply unit that supplies a predetermined low voltage lower than a predetermined power supply voltage from the control unit to the high-frequency unit when the wireless system is activated, and from the control unit to the high-frequency unit in the low-voltage state. Command transmission means for transmitting a predetermined initial setting command for model verification, and when a response to the initial setting command is returned from the high frequency unit within a predetermined time,
Boosting means for boosting a low voltage supplied to the high-frequency unit from the control unit to a predetermined high voltage; and determining whether the high voltage input to the high-frequency unit is within a predetermined range. Power supply control means for supplying a high voltage to the high-voltage power receiving section of the high-frequency section only when the power supply is within the power supply section.

With such a configuration, a specified power supply voltage is supplied from the control unit to the high frequency unit only when the control unit and the high frequency unit of the same model are connected. Only when the supplied power supply voltage is within a predetermined range, power is supplied to necessary parts of the high-frequency unit. Therefore,
The system can be prevented from being damaged due to the level of the power supply voltage.

According to a second aspect of the present invention, in the first aspect of the present invention, the power supply control means is provided only when the input high voltage of the high frequency section is within a predetermined range and there is a response to an initialization command. The high voltage power receiving section is supplied with a high voltage.

With such a configuration, the reliability of the wireless system can be enhanced by calculating the logical product of the model matching and the suitability of the supply power supply voltage.

According to a third aspect of the present invention, there is provided the first or second aspect.
In the invention described above, an alarm is generated when the high voltage input to the high frequency unit is not within a predetermined range.

With this configuration, it is possible to easily know the abnormality of the power supply voltage on the high frequency unit side.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an example of a wireless system to which an embodiment of the present invention is applied. In the figure,
1 is a transmission control unit, 2 is a transmission high frequency unit, 3 is a parabolic antenna for transmission, and 4 is a coaxial cable.

First, the transmission control unit 1 will be described. In the figure, reference numeral 11 denotes a power supply device having a booster circuit 11a therein, and 12 denotes an AC100V or DC1 supplied from the outside.
These are power switches interposed between 2 V and the power supply device 11. Further, 13 is a control CPU, 14 is an alarm circuit, and 15 is a mixer. The power supply device 11 is AC1
When either power supply of 00V or DC12V is supplied, + 12V, -12V used in the transmission control unit 1 and low voltage 24V supplied to the transmission high-frequency unit 2 or high voltage 48V / 58V by operation of the booster circuit 11a. To generate a stabilized voltage. The high voltage 48V / 58V takes into account the length of the coaxial cable and is switched by turning on / off an external switch 11b attached to the power supply device 11. Note that 48V is used when the length of the coaxial cable is 300 m or less, and 58V is used when the length is 300 m to 500 m.

The mixer 15 outputs the signal 2 output from the power supply 11.
The IF signal and C
It has a mixing function of superimposing the initial setting command signal generated by the PU 13 and sending it to the transmitting high-frequency unit 2 via the coaxial cable 4. Although not shown, the transmission control unit 1 contains a circuit for converting the captured video and the collected audio into an IF signal.

Next, the transmitting high frequency section 2 will be described.
In the figure, 21 is a separator, 22 is a power control circuit, 23
Is a stabilized power supply for CPU, 24 is a CPU for control, 25 is an alarm circuit, 26 is a stabilized power supply, and 27 is a semiconductor switch (may be a mechanical relay or the like). The separator 21
It has a function of separating the power, command signal, and IF signal supplied by the coaxial cable 4 from each other.
The IF signal separated by the separator 21 is subjected to frequency conversion, high-frequency amplification, and the like by a circuit (not shown), and is transmitted from the parabolic antenna 3 as a microwave.

The stabilized power supply 23 for the CPU has a voltage of 12V to 60V.
The DC voltage input in the range of V is supplied to the CPU 24 and the power supply control circuit 22 as a stabilized voltage of 12V. The current supplied to these is about 0.2 A in total. The power supply control circuit 22 determines that the input power supply voltage is within a predetermined range (25 V to 5 V).
0V), and if it is within a predetermined range, the semiconductor switch 27 is turned on and the voltage supplied from the transmission control unit 1 is applied to the stabilized power supply 26. The determination as to whether or not the voltage is within a predetermined range is made based on the value of the current flowing through the attached resistor R. The stabilized power supply 26 has an input voltage of 21 V
Stabilized voltages of +12 V and -12 V are output in the range of ５０50 V and supplied to a not-shown IF signal frequency conversion circuit, amplification circuit, and the like. This supply current is about 4A.

Next, a method of initializing the power supply device according to the present embodiment will be described with reference to the flowcharts of FIGS.

FIG. 2 is a flowchart of the initial setting operation of the transmission control unit 1, and FIG. 3 is a flowchart of the initial setting operation of the transmission high frequency unit 2. The processing programs shown in these flowcharts are stored in the CPU 13 of the transmission control unit 1 in advance.
ROM (not shown) and CPU of transmission high-frequency unit 2
24 are stored in a ROM (not shown).

First, the initial setting operation of the transmission control unit 1 will be described with reference to FIG. In the following example, the rated supply voltage of the transmission control unit 1 is DC48V, and the low-voltage power supplied from the transmission control unit 1 to the transmission high-frequency unit 2 at the time of initial setting is DC24V. The power supply device 11 outputs a low-voltage DC 24 V at the time of initial setting,
When a command is given from U13, the boosting circuit 11a boosts the output to DC48V of the rated power supply voltage and outputs it. As the booster circuit 11a, for example, a switching regulator may be used. The operating voltage of the CPU 13 in the transmission control unit 1 is DC12V, and the operating voltage of the CPU 24 in the transmission high-frequency unit 2 is also DC12V.
The CPU 24 supplies the voltage supplied from the transmission control unit 1 to C
The power is converted to 12 V DC by the PU stabilized power supply 23 and supplied.

When the transmission control section 1 and the transmission high-frequency section 2 are connected by the coaxial cable 4 as shown in FIG. 1 and the power switch 12 of the transmission control 1 is turned on (step S1 in FIG. 2).
The power supply device 11 outputs an operation power supply ± DC 12 V for each circuit including the CPU 13, and outputs a low-voltage DC 24 V to the transmission high-frequency unit 2 from the booster circuit 11 a via the coaxial cable 4 (step S 2).

CPU stabilizing power supply 23 in transmitting high-frequency section 2
Is a power supply D for operating the CPU 24 in response to the DC 24 V
C12V is output and supplied to the CPU 24 and also to the power supply control circuit 22. At the time of this initial setting, the semiconductor switch 27 is turned off, and no voltage is applied to the stabilized power supply 26. This is because the voltage applied to the power supply control circuit 22 at this time is within a predetermined range (25 V to 50 V).
V) outside, that is, 24 V or less, so that the semiconductor switch 27 is not turned on.

When the low-voltage DC 24 V is started to be supplied from the transmission control unit 1 to the transmission high-frequency unit 2 as described above, C
The PU 13 sets a delay timer (step S
3). In the case of the illustrated example, the delay timer is constituted by a soft timer, and the CPU of the transmission high-frequency unit 2 to which the operating power supply DC12V is applied from the CPU stabilized power supply 23.
24 provides a waiting time for waiting for a completely operable state.

When the delay timer counts up the preset delay time and the time is up, the CPU 13 transmits an initial setting command for model comparison to the transmitting high frequency unit 2 via the coaxial cable 4 (step S4). The monitoring timer is started (Step S5). In the case of the illustrated example, the monitoring timer is constituted by a soft timer, and is a monitoring time for determining whether or not a response (answer) to the initial setting command is returned from the transmitting high frequency unit 2 within the set time. Is to give.

Then, the CPU 13 monitors whether an answer to the initial setting command is returned from the transmitting high frequency unit 2 until the monitoring timer times out (steps S6, S8, S9).

If the answer is sent back from the transmitting high-frequency unit 2 before the monitoring timer expires (Y side in step S6), the CPU 13 determines that the transmitting control unit 1 and the transmitting high-frequency unit 2 are the same model. Then, the process proceeds to step S7, in which the supply of DC48V, which is the rated power supply voltage, is started instead of the previous DC24V.

That is, the CPU 13 controls the transmission high-frequency section 2
When the answer from the power supply device 11 is received, a boosting start command is sent to the boosting circuit 11a in the power supply device 11. Booster circuit 11a
Receives this command, starts the boosting operation, and replaces the previously output DC24V with the high-voltage DC48 which is the rated power supply voltage.
V and the transmission high-frequency unit 2 via the coaxial cable 4
Send to

On the other hand, if no answer is sent back from the transmitting high frequency unit 2 until the monitoring timer times out (Y side of step S9), the CPU
13 determines that the transmission control unit 1 and the transmission high-frequency unit 2 are not the same model, and proceeds to step S10 to execute the alarm circuit 1
For example, the unit 4 is driven to blink an alarm lamp (not shown), thereby issuing a warning to the user of the wireless system that the model of the connected unit does not match.

Next, an initial setting operation of the transmitting high-frequency unit 2 will be described with reference to FIG.

When the transmission high-frequency unit 2 receives the low-voltage DC 24 V from the transmission control unit 1 (step S21), the transmission high-frequency unit 2
U stabilized power supply 23 converts to DC 12V
And to the power supply control circuit 22. With the supply of DC12V, the CPU 24 and the power supply control circuit 22 are set to the operating state, and the CPU 24 sets the delay timer (step S22). In the case of the illustrated example, the delay timer is constituted by a soft timer, and the delay timer of the CPU 13 of the transmission control unit 1 (step S in FIG. 2).
This is for waiting for a predetermined time according to 3).

When the delay timer counts up a predetermined delay time and the time is up, the CPU 24 sets a monitoring timer (step S23). In the case of the example shown,
This monitoring timer is constituted by a soft timer, and gives a monitoring time for determining whether or not the transmission control unit 1 has transmitted an initial setting command for model comparison within the set time.

Then, the CPU 24 monitors whether an initialization command is transmitted from the transmission control unit 1 until the monitoring timer times out (steps S24, S27, S28).

If an initial setting command for model collation is sent from the transmission control unit 1 before the monitoring timer times out (Y side in step S24), the CPU 24 analyzes the command contents and determines whether both models are compatible. If they match, an answer is sent back to the transmission control unit 1 (step S2).
5).

When the CPU 13 of the transmission control unit 1 receives the answer within a predetermined time, it sends a boost start command to the booster circuit 11a as described above, and converts the 24 VDC to the 48 VDC.
And supplies it to the transmission high-frequency unit 2. Transmission high frequency unit 2
Then, a high voltage power supply is received (step S26). At this time, the power supply control circuit 22 determines whether or not the supplied high voltage is within a predetermined range, specifically, whether it is within a range of 25 V to 50 V (step S29). If it is within this range, the semiconductor switch 27 is turned on (step S30), and the power supply voltage supplied from the transmission control unit 1 is applied to the stabilized power supply 26.

In the stabilized power supply 26, the applied voltage is
The voltage is converted to 12V and -12V and supplied to a frequency conversion circuit, a power amplifier circuit, and the like (not shown) (step S31), so that a normal operation can be performed.

On the other hand, when the transmission control unit 1 does not send an initial setting command for model comparison until the monitoring timer times out (step S28).
Y side), the model is determined not to be collated, and all the processing ends. Furthermore, the high voltage sent from the transmission control unit 1
If not, the flow proceeds to step S32 to drive the alarm circuit 25 to flash an alarm lamp (not shown). Thereby, the user of the wireless system is warned that the length of the coaxial cable 4 connecting the connected transmission control unit 1 and transmission high-frequency unit 2 is not appropriate.

At this time, for example, if the length of the coaxial cable 4 exceeds 300 m, the external switch 11 attached to the power supply 11 in the transmission control unit 1 is used.
Switch b to increase the supply voltage to 58V. If a coaxial cable 4 having a short length is used, a countermeasure may be taken to replace the coaxial cable 4 with a cable having an appropriate length, for example, 300 m to 500 m. The power supply control circuit 22 monitors the voltage not only at the time when the high voltage is supplied from the transmission control unit 1 but also at the time of actual load.
When the detected voltage is equal to or higher than + 49V or equal to or lower than + 24V, the semiconductor switch 27 is turned off to stop applying the voltage to the stabilized power supply 26, and the alarm circuit 25 is operated to generate an alarm.

As described above, the rated power supply voltage is transmitted from the transmission control unit 1 to the transmission high-frequency unit 2 only when the models of the transmission control unit 1 and the transmission high-frequency unit 2 match. Therefore, even when the transmission control unit 1 and the transmission high-frequency unit 2 of different models are erroneously connected, it is possible to prevent an accident such as the transmission high-frequency unit 2 being damaged due to the high voltage. Further, the transmitting high-frequency unit 2 determines whether or not the transmitted voltage is within a predetermined range, and if not, does not apply the voltage to the stabilized power supply 26. Therefore, it is possible to prevent damage to the stabilized power supply 26 due to application of a voltage exceeding the specified value, and to narrow the allowable input voltage range of the stabilized power supply 26 from +21 V to +50 V, thereby reducing costs. Further, since the applied voltage of the stabilized power supply is within the predetermined range, there is no possibility that other circuits may be damaged due to an abnormal output voltage.

The low voltage supply means in the present invention is provided in the power supply device 11 of the above embodiment, and the command transmission means is provided in the C
In the PU 13, the boosting means is in the boosting circuit 11 a, the power control means is in the power control circuit 22, and the high-voltage power receiving section is in the stabilized power supply 26.
Respectively.

Next, another embodiment of the present invention will be described. This embodiment shows the stability of the previous embodiment,
The condition for the power supply control circuit 22 to turn on the semiconductor switch 27 is set as follows: the input high voltage of the transmission high-frequency unit 2 is within a predetermined range (25 V to 50 V), and the initialization from the transmission control unit 1 is performed. Only when there is a response from the CPU 24 in the transmission high-frequency unit 2 to the command, a high voltage is supplied to each high-voltage power receiving unit of the high-frequency unit. That is, the logical product is determined.
Thereby, the reliability of the system can be improved.

Although the embodiment of the present invention has been described as a wireless system on the transmitting side, the power supply device is completely the same in the wireless system on the receiving side, and a description thereof will be omitted.
It should be noted that the present invention is not limited to the above embodiment, and various modifications in accordance with the gist of the invention are possible.
Further, instead of the CPU, the same function can be realized by a dedicated hardware circuit.

[0045]

According to the first aspect of the present invention, a specified power supply voltage is supplied from the control unit to the high-frequency unit only when the control unit and the high-frequency unit of the same model are connected. At this time, since the power is supplied to the high-voltage power receiving unit of the high-frequency unit only when the supply voltage is within a predetermined range, the system can be prevented from being damaged due to a difference in the power supply voltage. Further, since the range of the voltage input to the high-voltage power receiving unit is limited, it is not necessary to widen the allowable input range of the high-voltage power receiving unit, and the cost can be reduced.

According to the second aspect of the present invention, the high voltage is supplied to the high-voltage power receiving section of the high-frequency section only when the input high voltage of the high-frequency section is within the predetermined range and there is a response to the initialization command. As a result, the reliability of the wireless system can be further improved.

According to the third aspect of the present invention, when the high voltage input to the high frequency unit is not within a predetermined range, an alarm is generated, so that a person in the high frequency unit side is in an abnormal state. Is quickly found and it is easy to take a corresponding action.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of a transmission wireless system configured by applying the method of the present invention.

FIG. 2 is a flowchart of an initial setting operation of a transmission control unit.

FIG. 3 is a flowchart of an initial setting operation of the transmitting high-frequency unit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Transmission control unit 2 Transmission high frequency unit 3 Parabolic antenna 4 Coaxial cable 11 Power supply device 11a Booster circuit 12 Power switch 13 CPU 14 Alarm circuit 15 Mixer 21 Separator 22 Power supply control circuit 23 CPU stabilized power supply 24 CPU 25 Alarm circuit 26 Stability Power supply 27 Semiconductor switch

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5H410 CC02 CC03 CC05 DD02 DD05 EB25 FF28 5K011 DA28 DA29 HA06 JA08 KA12 LA01

Claims (3)

[Claims] 1. A high frequency unit for transmitting or receiving a radio wave,
A control unit for controlling the high-frequency unit, wherein the control unit supplies operating power for the high-frequency unit from the control unit. Low voltage supply means for supplying a predetermined low voltage lower than the power supply voltage of the following; command transmission means for transmitting a predetermined initialization command for model comparison from the control unit to the high frequency unit in the low voltage state; When a response to the initialization command is returned from the high-frequency unit within a predetermined time, a boosting unit that boosts a low voltage supplied to the high-frequency unit from the control unit to a predetermined high voltage; Power supply control means for determining whether or not the high voltage inputted to is within a predetermined range, and supplying the high voltage to the high-voltage power receiving section of the high frequency section only when the high voltage is within the predetermined range And a power supply device for a wireless system. 2. The power supply device for a wireless system according to claim 1, wherein the power supply control circuit is configured to control the high frequency only when the input high voltage of the high frequency section is within a predetermined range and there is a response to the initialization command. A power supply device for a wireless system, wherein a high voltage is supplied to each high-voltage power receiving unit of the unit. 3. The wireless power supply device according to claim 1, wherein an alarm is generated when the high voltage input to the high frequency unit is not within a predetermined range. System power supply.