JP3582619B2 - Initial setting method of power supply in wireless system - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an initial setting method of power supply in a wireless system, and more particularly, to an initial setting when power supply from a control unit to a high-frequency unit is started in a wireless system configured as a set of a control unit and a high-frequency unit. It relates to the setting method.
[0002]
[Prior art]
2. Description of the Related Art In a wireless system for transmitting and receiving video and audio by radio waves, for example, a wireless system used for mobile relay of a television, a video signal or an audio signal is converted into an intermediate frequency in consideration of portability, mobility, and operability of the device. Control unit, and a high-frequency unit that converts the intermediate frequency signal to radio frequency and transmits it as radio waves from a parabolic antenna, etc., and separates them into units. Make up.
[0003]
When such a unit-separated wireless system is used, for example, installed in a broadcast van, the high-frequency unit is mounted on a tripod together with a parabolic antenna and installed on the roof of the car, and the control unit is used in a control room in the car. It is to be installed in. For this reason, in the unit-separated wireless system, the power of the high-frequency unit installed outdoors is supplied from the control unit via a cable or superimposed on a coaxial cable for signal transmission connecting the control unit and the high-frequency unit. It is usually done.
[0004]
[Problems to be solved by the invention]
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, there is no problem if the power supply voltage of both is the same or the power supply voltage of the control unit is lower than the power supply voltage of the high-frequency unit. If the power supply voltage of the unit is higher than the power supply voltage of the high frequency unit, the high voltage may destroy the high frequency unit.
[0005]
The present invention has been made in order to solve the above-described problems, and an object thereof is that even when a control unit of a different model and a high-frequency unit are erroneously connected, the high-frequency unit is not affected by a difference in power supply voltage. An object of the present invention is to provide a method of initializing power supply in a wireless system that can be prevented from being broken.
[0006]
[Means for Solving the Problems]
In order to solve the above problems, the present invention employs the following means.
That is, the invention according to claim 1 comprises a high-frequency unit for transmitting or receiving a radio wave, and a control unit for controlling the high-frequency unit, and a radio power supply for supplying operating power of the high-frequency unit from the control unit. In the system, at the time of activation of the wireless system, a predetermined low voltage lower than a prescribed power supply voltage is supplied from the control unit to the high-frequency unit, and in the low-voltage state, the control unit sends a high-frequency unit to the high-frequency unit for model matching. 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 supplied to a specified power source. When switching to voltage and no response is returned within a predetermined time It is characterized in that it has to issue a warning as a model mismatch control unit and the radio frequency unit.
[0007]
In 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. When a control unit and a high-frequency unit of different models are connected, a model mismatch warning is issued. Therefore, damage and destruction of the system due to a difference in power supply voltage can be prevented.
[0008]
According to a second aspect of the present invention, in the first aspect of the present invention, supply of a prescribed power supply voltage from the control unit to the high-frequency unit is performed by boosting the low voltage. is there.
[0009]
In such a configuration, there is no need to prepare a plurality of independent power supplies having different voltages in the control unit, so that even if the method of the present invention is applied to a wireless system, the size of the apparatus does not increase.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a first example of a wireless system configured by applying the method of the present invention.
In the first example, the method of the present invention is applied to a radio system for transmission. In the figure, 1 is a transmission control unit, 2 is a high-frequency transmission unit, 3 is a parabolic antenna for transmission, and 4 is a signal transmission antenna. 5 is a power cable, and 6 is a control signal cable. The transmission wireless system is configured by the transmission control unit 1 and the transmission high-frequency unit 2 as one set.
[0011]
The transmission control unit 1 includes a pre-emphasis circuit 101, a low-pass filter 102, a sound modulation circuit 103, a synthesis circuit 104, an intermediate frequency modulation circuit 105, a power supply device 106 including a booster circuit 106A, a control CPU 107, an alarm circuit 108, It comprises a switch 109.
[0012]
The transmitting high-frequency unit 2 includes an intermediate frequency amplifying circuit 201, an up-converter 202 for converting the intermediate frequency signal into a transmitting microwave, a local oscillator 203, a power amplifier 204, a high-voltage power receiving circuit 205A, and a low-voltage power receiving circuit 205A. The power supply device 205 includes a circuit 205B and a control CPU 206.
[0013]
Before describing the method of initializing the power supply voltage according to the present invention in the transmission wireless system configured as described above, first, signal processing operations of the transmission control unit 1 and the transmission high-frequency unit 2 will be briefly described.
[0014]
The video signal input to the transmission control unit 1 has a pre-emphasis circuit 101 to enhance a high-frequency portion by a predetermined level in order to reduce triangular noise accompanying FM modulation, and then a low-pass filter 102 to synthesize a video signal. Sent to
[0015]
Further, the audio signal is subjected to high-frequency conversion to a predetermined frequency band by an audio modulation circuit 103 in order to be synthesized with a video signal, and then sent to a synthesis circuit 104. The video signal and the audio modulation signal are synthesized by the synthesizing circuit 104, FM-modulated to a predetermined intermediate frequency signal in the intermediate frequency modulation circuit 105, and sent to the transmission high-frequency unit 2 via the coaxial cable 4. is there.
[0016]
The intermediate frequency signal transmitted from the transmission control unit 1 is amplified to a predetermined level by an intermediate frequency amplification circuit 201 in the transmission high frequency unit 2, and then up-converted by an up-converter 202 and a local oscillator 203 to a frequency of a transmission microwave. Is converted. After being amplified to a predetermined level by the power amplifier 204, the signal is transmitted from the parabolic antenna 3 as a microwave.
[0017]
Next, a method for initializing power supply according to the present invention will be described with reference to the flowcharts of FIGS.
[0018]
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 advance in a ROM (not shown) in CPU 107 of transmission control unit 1 and a ROM (not shown) in CPU 206 of transmission high-frequency unit 2, respectively.
[0019]
First, an initial setting operation of the transmission control unit 1 will be described with reference to FIG.
In the following example, the rated power supply voltage of the transmission high-frequency unit 2 is set to 36 V DC, 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 set to 12 V DC. The booster circuit 106A in the power supply device 106 outputs a low-voltage DC12V at the time of initial setting, and boosts and outputs the rated power supply voltage DC36V when a command is given from the CPU 107. As the booster circuit 106A, for example, a switching regulator may be used. The operating voltage of the CPUs 107 and 206 is DC 5 V smaller than the DC 12 V, and the CPU 107 and 206 can operate normally even when DC 12 V is supplied.
[0020]
When the transmission control unit 1 and the transmission high-frequency unit 2 are connected as shown in FIG. 1 and the power switch 109 of the transmission control unit 1 is turned on (step S1 in FIG. 2), the power supply device 106 The power supply 12 outputs an operation power supply DC12V for the CPU 105 and an operation power supply DC5V for the CPU 107, and outputs a low-voltage DC12V from the booster circuit 106A to the transmission high-frequency unit 2 via the power supply cable 5 (step S2).
[0021]
The low-voltage power receiving circuit 205 </ b> B in the transmitting high-frequency unit 2 receives the DC 12 V, outputs an operating power DC 5 V of the CPU 206, and supplies it to the CPU 206. At the time of this initial setting, the output switch 205C of the high-voltage power receiving circuit 205A is turned off, and the supply of power to each of the circuits 201 to 204 is stopped.
[0022]
When the low voltage DC12V is started to be supplied from the transmission control unit 1 to the transmission high-frequency unit 2 as described above, the CPU 107 sets a delay timer (step S3). In the case of the example shown in the figure, the delay timer is constituted by a soft timer, and provides a waiting time for waiting for the CPU 206 of the transmitting high-frequency unit 2 to which the operating power supply DC 5 V is applied to be completely operable. It is.
[0023]
When the delay timer counts up a preset delay time and the time is up, the CPU 107 transmits an initial setting command for model comparison to the transmission high-frequency unit 2 via the control signal cable 6 (step S4), and thereafter, the monitoring timer Is started (step S5). In the case of the illustrated example, this monitoring timer is constituted by a soft timer, and is a monitoring time for determining whether a response (answer) to the initial setting command is returned from the transmitting high-frequency unit 2 within the set time. Is to give.
[0024]
Then, the CPU 107 monitors whether or not the answer to the initialization command is returned from the transmission high-frequency unit 2 until the monitoring timer expires (steps S6, S8, S9).
[0025]
If the answer is sent back from the transmitting high-frequency unit 2 before the monitoring timer times out (Y side of step S6), the CPU 107 determines that the transmitting control unit 1 and the transmitting high-frequency unit 2 are the same model, and The process proceeds to S7, in which the supply of DC 36V, which is the rated power supply voltage, is started instead of the previous DC 12V.
[0026]
That is, when receiving the answer from the transmitting high-frequency unit 2, the CPU 107 sends a boosting start command to the boosting circuit 106 </ b> A in the power supply 106. The booster circuit 106A starts the boosting operation in response to this command, boosts the DC12V output up to that time to a high voltage DC36V which is a rated power supply voltage, and supplies the boosted power to the power supply circuit 205 of the transmission high-frequency unit 2 via the power supply cable 5. send.
[0027]
The high voltage power receiving circuit 205A in the power circuit 205 of the transmitting high frequency unit 2 receives the DC 36V and converts it to DC ± 12V, and the CPU 206 turns on the output switch 205C based on the power receiving information from the power circuit 205. And an operation power supply DC ± 12 V to each of the circuits 201 to 204. As a result, the circuits 201 to 204 in the transmission high-frequency unit 2 are set to a state where normal operation is possible.
[0028]
On the other hand, if the answer is not sent back from the transmitting high-frequency unit 2 until the monitoring timer times out (Y side in step S9), the CPU 107 determines that the transmitting control unit 1 and the transmitting high-frequency unit 2 are of the same model. Then, the process proceeds to step S11, and the alarm circuit 108 is driven to flash an alarm lamp (not shown), so that the model of the unit connected to the wireless system user matches. Gives a warning that there is none.
[0029]
Next, an initial setting operation of the transmitting high-frequency unit 2 will be described with reference to FIG. Note that, as described above, before the supply of DC 36 V, which is the rated power supply voltage, the output switch 205C in the power supply circuit 205 is OFF.
[0030]
When the power supply circuit 205 receives low-voltage DC12V from the transmission control unit 1 (step S21), the low-voltage power supply circuit 205B converts it to DC5V and supplies it to the CPU 206. With the supply of DC5V, only the CPU 206 is set to the operation state, and the delay timer is set (step S22). In the case of the example shown in the figure, the delay timer is constituted by a soft timer, and is to wait for a predetermined time in accordance with the delay timer (step S3 in FIG. 2) of the CPU 107 of the transmission control unit 1.
[0031]
When the delay timer counts up a predetermined delay time and the time is up, the CPU 206 sets a monitoring timer (step S23). In the case of the example shown in the figure, this monitoring timer is constituted by a soft timer, and gives a monitoring time for determining whether or not an initial setting command for model comparison has been transmitted from the transmission control unit 1 within the set time. It is.
[0032]
Then, the CPU 206 monitors whether the initialization command is transmitted from the transmission control unit 1 until the monitoring timer times out (steps S24, S27, S28).
[0033]
If an initial setting command for model collation is sent from the transmission control unit 1 before the monitoring timer times out (Y side of step S24), the CPU 206 analyzes the content of the command and determines whether the two models match. Is sent back to the transmission control unit 1 (step S25).
[0034]
Upon receiving the answer within a predetermined time, the CPU 107 of the transmission control unit 1 sends a boost start command to the booster circuit 106 as described above, boosts DC12V to DC36V, and sends it to the transmission high-frequency unit 2. The high-voltage power receiving circuit 205A in the power supply circuit 205 of the transmitting high-frequency unit 2 converts the high voltage DC36V into DC ± 12V and supplies it to the circuits 201 to 204 via the output switch 205C turned on by the CPU 206 ( Step S26). As a result, the circuits 201 to 204 in the transmission high-frequency unit 2 are set to a state where normal operation is possible.
[0035]
On the other hand, if the transmission control unit 1 does not send an initial setting command for model collation until the monitoring timer times out (Y side of step S28), it is determined that model collation is impossible and all processing is ended. I do. In this case, the output switch 205C in the power supply circuit 205 remains OFF without being turned ON.
[0036]
As described above, according to the first example, the rated power supply voltage from the transmission control unit 1 to the transmission high-frequency unit 2 is increased only when the models of the transmission control unit 1 and the transmission high-frequency unit 2 match. Power is transmitted. 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.
[0037]
FIG. 4 shows a second example of a wireless system configured by applying the method of the present invention.
In this second example, the method of the present invention is applied to a radio system for reception, and forms a pair with the radio system for transmission in FIG.
[0038]
In FIG. 4, 7 is a parabolic antenna for reception, 8 is a high-frequency reception unit, 9 is a reception control unit, and 10 is a coaxial cable for signal transmission. The receiving radio system is configured with the receiving high-frequency unit 8 and the receiving control unit 9 as one set.
[0039]
The receiving high-frequency unit 8 includes a low-noise amplifier 801, a down-converter 802, a local oscillator 803, an intermediate-frequency filter 804, an intermediate-frequency amplifier 805, a high-voltage power receiving circuit 205 </ b> A and a low-voltage power receiving circuit 205 </ b> B. , And a control CPU 206. The power-related parts have exactly the same configuration and operation as those in the case of the transmission wireless system of FIG. 1, and therefore are denoted by the same reference numerals, and detailed description thereof will be omitted.
[0040]
The reception control unit 9 includes a de-emphasis circuit 901, a low-pass filter 902, a video amplification circuit 903, an audio demodulation circuit 904, a power supply device 106 including a booster circuit 106A, a control CPU 107, an alarm circuit 108, and a power switch 109. ing. The power-related parts have exactly the same configuration and operation as those in the case of the transmission wireless system of FIG. 1, and therefore are denoted by the same reference numerals, and detailed description thereof will be omitted.
[0041]
The signal processing operation of the reception high-frequency unit 8 and the reception control unit 9 will be briefly described. The radio wave received by the parabolic antenna 7 connected to the reception high-frequency unit 8 is amplified to a predetermined level by the low-noise amplifier circuit 801. Thereafter, the frequency is converted to a predetermined intermediate frequency signal by the down converter 802 and the local oscillator 803. Then, the signal is sent to the intermediate frequency amplifier circuit 805 via the intermediate frequency filter 804, amplified to a predetermined level, and then sent to the reception control unit 9 via the coaxial cable 10.
[0042]
The intermediate frequency signal sent from the reception high-frequency unit 8 to the reception control unit 9 via the coaxial cable 10 is reduced in high frequency by the de-emphasis circuit 901 and returned to the original frequency characteristic. Only the baseband signal is extracted, amplified to a predetermined level by the video amplifier circuit 903, and then output as the original video signal. On the other hand, the intermediate frequency signal is also sent to an audio demodulation circuit 904, and after being demodulated by the audio demodulation circuit 904, is output as an original audio signal.
[0043]
Since the initial setting operation of the power supply from the reception control unit 9 to the reception high-frequency unit 8 is exactly the same as that of the transmission wireless system of FIG. 1 as described above, the description of the operation is omitted.
[0044]
Although the embodiments of the present invention have been described above, the present invention is not limited to these, and various modifications can be made in accordance with the gist of the present invention. Further, instead of the CPU, the same function can be realized by a dedicated hardware circuit.
[0045]
【The invention's effect】
According to the invention described in claim 1, at the time of starting the wireless system, a predetermined low voltage lower than a prescribed power supply voltage is supplied from the control unit to the high-frequency unit, and a model is supplied from the control unit to the high-frequency unit. A predetermined initialization command for verification is transmitted, and when a response to the initialization command is returned from the high frequency unit within a predetermined time in the low voltage state, the response is supplied from the control unit to the high frequency unit. When a low voltage is switched to the specified power supply voltage and a response is not returned within a predetermined time, a warning is issued as a mismatch between the control unit and the high-frequency unit. The specified power supply from the control unit to the high-frequency unit is only There is provided, when the control unit and the high frequency unit of a different type is connected, the model mismatch warning is issued. For this reason, damage and destruction of the system due to a difference in power supply voltage can be prevented.
[0046]
According to the second aspect of the present invention, since the supply of the specified power supply voltage from the control unit to the high-frequency unit is performed by boosting the low voltage, a plurality of independent power supplies having different voltages are provided in the control unit. Need not be prepared, and the apparatus does not increase in size even if the method of the present invention is applied to a wireless system.
[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.
FIG. 4 is a block diagram showing an example of a receiving wireless system configured by applying the method of the present invention.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 transmission control unit 2 transmission high-frequency unit 3 parabolic antenna 5 power cable 6 control signal cable 7 parabolic antenna 8 reception high-frequency unit 9 reception control unit 106 power supply device 106A booster circuit 107 CPU
108 Alarm circuit 109 Power switch 205 Power circuit 205A High voltage power receiving circuit 205B Low voltage power receiving circuit 205C Output switch 206 CPU

Claims (2)

In a wireless system configured to include a high-frequency unit for transmitting or receiving radio waves and a control unit for controlling the high-frequency unit, and to supply operating power of the high-frequency unit from the control unit,
Upon activation of the wireless system, the control unit supplies a predetermined low voltage lower than a specified power supply voltage to the high-frequency unit,
In the low voltage state, a predetermined initial setting command for model matching is transmitted from the control unit to the high frequency unit,
When a response to the initialization command has been returned from the high-frequency unit within a predetermined time, while switching the low voltage supplied to the high-frequency unit from the control unit to a specified power supply voltage,
A method for initializing power supply in a wireless system, wherein if no response is returned within a predetermined time, a warning is issued as a mismatch between the control unit and the high-frequency unit. 2. The method for initializing power supply in a wireless system according to claim 1, wherein the supply of a prescribed power supply voltage from the control unit to the high-frequency unit is performed by boosting the low voltage.

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