KR0165619B1 - Power apparatus in a radio communication system - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power supply apparatus for a wireless communication system for generating an operating power required for transmitting and receiving data in a wireless communication system in which predetermined data or signals are transmitted and received through a public wave transmission network. High output amplification means requiring a second voltage lower than the voltage; and low noise amplification means requiring a third voltage lower than the first voltage and higher than the second voltage and a fourth voltage lower than the third voltage. A wireless communication system, comprising: constant voltage means for generating the third voltage based on the first voltage and first DC / DC converting means for generating the second voltage based on the third voltage output from the constant voltage means; Second DC / DC conversion means for generating the fourth voltage based on a third voltage output from the constant voltage means, and the first voltage and the third voltage rise above a predetermined level. Overvoltage detecting means for detecting a voltage, switching means for intermittently supplying the first voltage according to a detection result of the overvoltage detecting means, and outputting through the third voltage output line. If the current value is out of a predetermined range is characterized in that it comprises a current detecting means for outputting an alarm signal.

Description

Power Supply for Wireless Communication System

1 is a block diagram showing a configuration for transmitting and receiving signals in a general wireless communication system.

2 is a circuit diagram showing a power supply for a wireless communication system according to an embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

21: constant voltage circuit 22, 23: DC / DC converter

24: switching unit 25: overvoltage detection unit

26: current detector CP1 ~ CP3: comparator

ZD1 to ZD3: Zener Diode

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless communication system configured to transmit and receive predetermined data or signals through a public wave transmission network, and more particularly to a power supply apparatus for a wireless communication system that generates an operating power required for transmitting and receiving data.

In general, a method of transmitting and receiving a signal or data can be largely divided into a wired communication method through a wire and a wireless communication method through an over-the-air transmission network. In the case of a wireless communication, a long distance is provided without a separate line. Since the data transmission and reception between the two can be performed, the range of application is gradually being expanded.

However, in a wireless communication system, since transmission and reception data are exposed to the external environment, it is necessary to transmit and receive data in consideration of the resilience of the signal to noise. When transmitting and receiving data, a low noise amplification step of amplifying the data signal while removing the noise signal is performed.

FIG. 1 is a block diagram showing a configuration for data transmission and reception in the above-described wireless communication system, and particularly shows a configuration employed in a satellite communication system.

In FIG. 1, reference numeral 1 denotes an antenna for transmitting and receiving an uplink signal and a downlink signal for a satellite, and 2 denotes an antenna for transmitting and receiving through the antenna 1 using polarization of frequency. Orthogonal Mode Transducer (3), which separates and inputs and outputs a separate signal, and a 3 is a low noise amplifier (LNA) for low noise amplifying a downlink signal frequency of 12.25 to 12.75 GHz, for example, inputted through the orthogonal mode converter (2). 4) a down converter for converting a signal frequency applied through the low noise amplifier 3 into an intermediate frequency signal IF of, for example, 70 MHz, and 5 outputting from the down converter 4; The demodulation circuit recovers original transmission data from the intermediate frequency signal.

In Fig. 1, reference numeral 6 denotes a modulation circuit for modulating data to be transmitted, and 7 denotes a frequency up-converter for converting an intermediate frequency signal output from the modulation circuit 5 into microwaves of 14.0 to 14.5 GHz, for example. Converter 8) is a high output amplifier such as, for example, a solid state power amplifier (SSPA) that amplifies the output level of the uplink signal frequency output from the frequency converter 7.

That is, in the above-described wireless communication system, the output signal is amplified and output by the high power amplifier 8 for the frequency signal to be transmitted, and in the case of the received frequency signal, the amplification process is performed while suppressing the noise to reduce the noise. This improves the recoverability of the received data.

However, in the above-described wireless communication system, there are the following problems.

In the configuration of FIG. 1, the low noise amplifier 3 and the high output amplifier 8 usually require different operating voltages, so the low noise amplifier 3 has an operating voltage of approximately + 5V and -5V and approximately 72mA ± 20%. While operating current is required, the high power amplifier 8 requires operating voltages of + 10V and -5V.

Therefore, since separate power supplies for generating + 5V, -5V, and + 10V must be provided, manufacturing costs are increased and the configuration of the device is complicated.

In addition, when the operation noise of the low noise amplifier 3 changes, the low noise amplification operation of the received signal becomes unstable, thereby making it difficult to restore original data from the received signal frequency. It is difficult to confirm whether the state is caused by the noise environment of the airwave transmission network, the change of the operating power source, or the abnormality of a specific circuit part.

In addition, when the operating voltage rises above a certain level, the high output amplifier 8 causes the level of the output signal to increase greatly due to excessive amplification, in which case it affects the receiving side receiving the output signal. In severe cases, the receiving circuit may be damaged.

Accordingly, the present invention has been made in view of the above circumstances, and a first object of the present invention is to provide a power supply device for a wireless communication system capable of generating operating power required for a high output amplifier and a low noise amplifier, respectively, in a simple configuration. .

In addition, the second object of the present invention is to automatically block the supply of the operating voltage to the high output heavy amplifier when the operating voltage for the high output amplifier rises above a certain level, thereby preventing the receiving system from being damaged by excessive amplification operation. The present invention provides a power supply device for a wireless communication system.

In addition, a third object of the present invention is to provide a power supply device for a wireless communication system that can warn of an error in the operation power supplied to the low noise amplifier.

A wireless communication system power supply apparatus according to the present invention for achieving the above object is a high output amplification means that requires a first voltage and a second voltage lower than the first voltage, and a lower than the first voltage and than the second voltage A wireless communication system comprising a high noise voltage means and a low noise amplification means requiring a fourth voltage lower than the third voltage, comprising: constant voltage means for generating the third voltage based on the first voltage; First DC / DC conversion means for generating the second voltage based on the third voltage output from the means, and second DC / DC generating the fourth voltage based on the third voltage output from the constant voltage means. Characterized in that it comprises a conversion means.

In addition, the present invention is provided with an overvoltage detecting means for detecting that the first voltage and the third voltage rise above a predetermined level, and the first voltage output line is installed in the first voltage output line and according to the detection result by the overvoltage detecting means. And a switching means for interrupting the supply of one voltage.

In addition, the present invention is characterized in that it further comprises a current detecting means for outputting an alarm signal when the current value output through the third voltage output line is out of a predetermined range.

According to the present invention having the above-described configuration, the second voltage required by the high output amplifier means and the third and fourth voltages required by the low noise amplifier means are generated based on the first voltage supplied to the high output amplifier means. Therefore, it is possible to generate the operating power for the high power amplifier means and the low noise amplifier means with a simple configuration.

In addition, when an abnormality occurs in the operating voltage supplied to the high output amplification means, the voltage supply state is immediately interrupted, thereby preventing other systems from being damaged by the overamplification state of the high output amplification means.

In addition, when the supply current for the low noise amplification means is out of a predetermined range, a warning signal is outputted, thereby making it possible to easily recognize a false detection state of the received data due to an abnormal operation state of the low noise amplification means.

Hereinafter, an embodiment according to the present invention will be described with reference to the drawings.

2 is a block diagram showing a power supply device for a wireless communication system according to an embodiment of the present invention. In the drawing, reference numeral Vin denotes, for example, a 10V power supply for the high power amplifier 8 output from a power supply device (not shown). The power supply Vin is applied to the high output amplifier SSPA through the switching unit 24 to be described later, and is coupled to a constant voltage circuit (Regulator) 21 for generating a constant voltage of + 5V.

In addition, the output of the constant voltage circuit 21 is output as an operating voltage for the low noise amplifier (LNA) and is applied to the first and second DC / DC converters 22 and 23, and the first and second DC / The DC converters 22 and 23 generate voltages of -5V required by the high output amplifier SSPA and the low noise amplifier LNA based on the + 5V voltage applied from the constant voltage circuit 21, respectively. 3, Vout 4) to output.

That is, in the above configuration, + 5V for the low noise amplifier (LNA) in the constant voltage circuit 21 and the second DC / DC converter 23 using the operating voltage Vin of + 10V for the high output amplifier SSPA. And -5V to generate the voltage of -5V required by the high output amplifier (SSPA) based on the voltage of + 5V output from the constant voltage circuit 21, thereby generating + 10V Only one power supply is needed to operate the high power amplifier and low noise amplifier.

Here, reference numeral ZD1 denotes a zener diode for stabilizing an input voltage input through the power input terminal Vin, C1 and C2 are smoothing capacitors, and C3 and C4 are noise removing filters.

In FIG. 2, reference numeral 24 denotes a switching unit for controlling a voltage of + 10V output through the output terminal Vout 1, that is, supplied to the high output amplifier SSPA, and 25 denotes the output terminal Vout 1. The voltage of + 10V and -5V output through the output terminal (Vout 3), that is, + 10V and -5V supplied to the high output amplifier (SSPA) is examined and the supply voltage rises above a predetermined level. The overvoltage detection unit cuts the supply voltage output through the output terminal Vout 1 by switching the switching unit 24.

Here, the switching unit 24 includes a PNP transistor Q1 having a current path between an emitter and a collector coupled to a power supply line coupled to the output terminal Vout 1, and an emitter of the transistor Q1. And a bias resistor R1 coupled between the bases.

In addition, the overvoltage detector 25 includes resistors R2 and R3 connected in series between the power supply line to the output terminal Vout 1 and the power supply line to the output terminal Vout 2, and the output terminal Vout 1. Resistors (R4, R5) connected in series between the power supply line and ground, and an inverting terminal (-) are coupled to the connection points of the resistors (R2) and (R3) and connected to the connection points of the resistors (R4) and (R5). When the non-inverting terminal (+) is coupled and the detection voltage applied to the inverting terminal (-) becomes higher than the reference voltage applied to the non-inverting terminal (+), the comparator CP1 outputs a low level detection voltage. A zener diode ZD2 which connects the output of the comparator CP1 to the rear end only when a cathode is connected to the output terminal of the comparator CP1 and the output voltage of the comparator CP1 is equal to or greater than a predetermined value, that is, the zener voltage. Resistance divider circuits R6 and R7 coupled to the anode side of ZD2), and a base is formed in the resistance divider circuit. In addition as soon it is the collector is configured to coupled to the base of the transistor (Q1) forming the switching unit 24 containing the emitter resistor (R8), the NPN-type transistor (Q2) through the ground.

In addition, C5 and C6 mixed in the base of the transistor Q2 in the overvoltage detector 25 are bypass capacitors.

In the above configuration, the resistors R2 and R3 and the resistors R4 and R5 are non-inverting terminals (+) of the comparator CP1 when the first and second output voltages output to the output terminals Vout 1 and Vout 3 are normal. When the voltage value is higher than the inverting terminal (-) side by a predetermined value or more, and the output voltage rises by a certain level or more from the normal state, the voltage on the inverting terminal (-) side is the non-inverting terminal (+) side voltage. The resistance value is set to be higher.

That is, in the overvoltage detector 25, the first voltage Vout 1 and the second voltage Vout 2 supplied to the high output amplifier 24 rise and fall above a predetermined level so that the inverting terminal of the comparator CP1 is negative. When the voltage applied to the side exceeds the reference voltage applied to the non-inverting terminal (+) side, the transistor Q2 for switching the switching unit 24 by the low level detection voltage output from the comparator CP1. ) Is turned off.

Therefore, in this case, the transistor Q1 constituting the switching unit 24 is turned off, and the + 10V operating voltage supplied to the high output amplifier SSPA is cut off, thereby causing another amplification by the excessive amplification operation of the high output amplifier SSPA. This will prevent the system from being affected.

In FIG. 2, reference numeral 26 denotes a current detector for detecting a current state of a power supply applied to a low noise amplifier (LNA) and outputting a detection signal accordingly.

The current detector 26 may include a first comparator CP2 for detecting that a supply current output to the output terminal Vout 2 falls below a predetermined level and a second comparator for detecting that the supply current rises above a predetermined level. CP3 is provided.

In the first and second comparators CP2 and CP3, the voltage output to the output terminal Vout 2 is coupled to the non-inverting terminal (+) and the inverting terminal (−), respectively. In addition, the resistors R11 and R12 and the variable resistor VR2 are connected in series between the power supply line to the output terminal Vout 2 and the ground to supply the reference voltage of the first comparator CP2, and the resistance ( A connection point of R11) and R12 is coupled to the inverting terminal (-) of the first comparator CP2, and a power supply line and ground to the output terminal Vout 2 for supplying a reference voltage of the second comparator CP3. The resistors R9 and R10 and the variable resistor VR1 are connected in series, and a connection point of the resistors R9 and R10 is coupled to the non-inverting terminal + of the second comparator CP3.

In addition, a resistor R13 is provided between the connection point of the resistors R9 and R11 to the power supply line to the output terminal Vout 2 and the connection point of the comparators CP2 and CP3. ), The drop voltage is changed according to the amount of current flowing through the power supply line. Accordingly, the first and second comparators CP2 and CP3 can detect a variation range of the amount of current flowing through the output terminal Vout 2 based on the voltage difference between the both ends of the resistor R13.

Also, in the above configuration, the variable resistors VR1 and VR2 are used to appropriately adjust the reference voltages for the first and second comparators CP2 and CP3, wherein the first and second comparators CP2 and CP3 are used. Denotes reference voltages set by the variable resistors VR1 and VR2, that is, reference voltages applied to the inverting terminal (-) of the first comparator CP2 and the non-inverting terminal (+) of the second comparator CP3, respectively. When V1 and V2 and the output voltage to the output terminal Vout 2 are Vo, a high level alarm signal (ARM) is output in the case of V1Vo or VoV2, and a low level normal signal is output in the case of VoV1V2. Done.

The alarm signals ARM output from the first and second comparators CP2 and CP3 are output through the reverse current prevention diodes D1 and D2, respectively.

At this time, the zener diode ZD3 disposed between the alarm signal output line and the ground maintains the normal signal level of the high level output from the first and second comparators CP1 and CP2 at a constant level. This is to prevent the case in which the normal signal is mistakenly recognized as an alarm signal due to an unstable state.

Next, the operation of the device having the above configuration will be described.

When a voltage of, for example, + 10V is input from the input terminal Vin, it is output to the output terminal Vout 1 through the switching unit 24 and applied to the constant voltage circuit 21. The constant voltage circuit 21 generates a voltage of +5 V based on the input voltage, supplies the voltage to the first and second DC / DC converters 22 and 23, and outputs the same through the output terminal Vout 2. The first and second DC / DC converters 22 and 23 generate -5V based on the + 5V applied from the constant voltage circuit 21 and output the outputs through the output terminals Vout 3 and Vout 4, respectively.

Accordingly, the high output amplifier SSPA is driven by + 10V and -5V output through the output terminals Vout 1 and Vout 3, and + 5V and -5V output through the output terminals Vout 2 and Vout 4. The low noise amplifier (LNA) is driven by.

On the other hand, when the operating voltage output through the output terminals (Vout 1, Vout 3) rises above a certain level in the normal operation state, the detection voltage set by the resistors (R2, R3) of the overvoltage detector 25 is increased. The output of the comparator CP1 becomes low level by being higher than the reference voltage set by the resistors R4 and R5. The transistor Q2 of the switching unit 24 is turned off by the low level output. Q1) is turned off.

That is, when the operating voltage applied to the high output amplifier (SSPA) rises above a certain level, the switching unit 24 is turned off to cut off the supply of the operating voltage, so that the excess of the high output amplifier (SSPA) due to the increase in the operating voltage Amplification can prevent other systems from being damaged.

On the other hand, when the operating current output to the output terminal Vout 2 is lowered to a predetermined level or lower due to the open state of the low noise amplifier LNA in the normal operation state described above, the voltage of +5 V output from the constant voltage circuit 21 is reduced. The detection voltage applied to the non-inverting terminal (+) side of the first comparator CP2 and applied to the non-inverting terminal (+) side is applied to the resistors R11 and R12 and the variable resistor VR2 applied to the inverting terminal (-) side. By higher than the reference voltage by the high level warning signal output from the first comparator (CP2) is output to the output terminal (ARM) through the diode (D1).

In addition, when the operating current output to the output terminal Vout 2 rises above a certain level due to an abnormality in the power supply device or a short circuit state of the low noise amplifier LNA in the above-described normal operation state, the voltage drop by the resistor R13 decreases. Is larger than the normal state, and the detection voltage applied to the inverting terminal (-) side of the second comparator CP3 is applied to the non-inverting terminal (+) side by the resistors R9 and R10 and the variable resistor VR1. Since the voltage is lower than the reference voltage, the high level warning signal output from the second comparator CP3 is output to the output terminal ARM through the diode D2.

Therefore, when the supply current supplied to the low noise amplifier LNA is out of a certain range due to an abnormal state of the low noise amplifier LNA or an abnormal state of the power supply, a warning signal is output through the output terminal ARM. The abnormal state of can be easily recognized.

That is, in the above embodiment, -5V required for the high power amplifier (SSPA) and + 5V required for the low noise amplifier (LNA) and-based on the + 10V supply power supplied to the high power amplifier (SSPA). It generates 5V, enabling a simple configuration to generate operating power for high power amplifiers (SSPAs) and low noise amplifiers (LNAs).

In addition, if an abnormality occurs in the operating voltage supplied to the high power amplifier (SSPA), the voltage supply state is immediately interrupted, thereby preventing other systems from being damaged by the overamplification state of the high power amplifier (SSPA). .

In addition, when the supply current to the low noise amplifier (LNA) is out of a predetermined range outputs a warning signal, it is possible to easily recognize the error detection state of the received data due to the abnormal operation state of the low noise amplifier (LNA).

In addition, the present invention is not limited to the above embodiments and can be carried out in various modifications within the scope not departing from the technical gist of the present invention, and the present invention may be limited only by the gist of the present invention. will be.

As described above, according to the present invention, it is possible to generate the operating power for the high output amplifier and the low noise amplifier with a simple configuration, and in the event of an abnormality in the supply voltage for the high output amplifier, the corresponding power supply is cut off, and the low noise amplifier When an abnormality occurs in the supply current to the power supply device for a wireless communication system that can warn it.

Claims (6)

High output amplification means requiring a first voltage and a second voltage lower than the first voltage, a third voltage lower than the first voltage and higher than the second voltage and a fourth voltage lower than the third voltage. A wireless communication system having low noise amplifying means, comprising: constant voltage means for generating the third voltage based on the first voltage, and generating the second voltage based on a third voltage output from the constant voltage means; And first DC / DC conversion means and second DC / DC conversion means for generating the fourth voltage based on the third voltage output from the constant voltage means. 2. The apparatus of claim 1, further comprising: an overvoltage detecting means for detecting that the first voltage and the third voltage rise above a predetermined level, and installed in the first voltage output line and in accordance with a detection result by the overvoltage detecting means. And a switching means for controlling the supply of the first voltage. 3. The method of claim 2, wherein the overvoltage detecting means comprises: first and second resistors connected in series between the first voltage output line and the second voltage output line, and a first connected in series between the first voltage output line and ground. Inverting terminals are coupled to the connection points of the third and fourth resistors and the first and second resistors, and a non-inverting terminal (+) is coupled to the connection points of the third and fourth resistors and applied to the inverting terminal (−). Comparison means for outputting a low level detection voltage when the detection voltage becomes higher than a reference voltage applied to the non-inverting terminal (+); and switching switching the switching means when the low level detection voltage is output from the comparison means. Power supply device for a wireless communication system comprising a drive means. 4. The power supply device for a wireless communication system according to claim 3, wherein a constant voltage diode is further provided between the output of said comparing means and the switching driving means. The power supply device for a wireless communication system according to claim 1, further comprising a current detecting means for outputting an alarm signal when the current value output through the first voltage output line is out of a predetermined range. 6. The current detecting means of claim 5, wherein the current detecting means comprises: a first comparison means for outputting an alarm signal when a voltage difference between the resistor provided in the third voltage output line and the resistance is greater than or equal to a predetermined value; And a second comparing means for outputting an alarm signal when the predetermined value is less than a predetermined value.