CN115001514A - High-voltage circuit of transmitter switch - Google Patents
High-voltage circuit of transmitter switch Download PDFInfo
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- CN115001514A CN115001514A CN202210604067.0A CN202210604067A CN115001514A CN 115001514 A CN115001514 A CN 115001514A CN 202210604067 A CN202210604067 A CN 202210604067A CN 115001514 A CN115001514 A CN 115001514A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/02—Details
- H04L12/10—Current supply arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0408—Circuits with power amplifiers
- H04B2001/0416—Circuits with power amplifiers having gain or transmission power control
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
The invention relates to a high-voltage circuit of a transmitter switch, which comprises a level sensor chip U1, a timer chip U3, an inverter U4, a multivibrator chip U5A, a multivibrator chip U5B, a photoelectric coupler U7 and a photoelectric coupler U6. The device adopts a digital design, simplifies the circuit structure, reduces or eliminates manual adjustment links, eliminates damage hidden dangers, improves the applicability, and improves the circuit sensitivity, response speed and working stability.
Description
Technical Field
The application belongs to the technical field of communication equipment, and more specifically relates to a high-voltage circuit of a transmitter switch.
Background
Guangzhou coast stations use JRC transmitters 42, 13 of ten kilowatt transmitters and 29 of five kilowatt transmitters. The part of transmitters covers all transmission service types of the center, wherein the DSC, NAVTEX, SSB, meteorological fax and other service types are broadcast irregularly or intermittently, and no idle signal exists in the non-broadcast period. At present, a signal sent to a message sending station by a central control system does not have independent switch high voltage and a control signal for starting and stopping a power amplifier, and the high voltage of a sender needs to be kept in an open state for a long time, so that the normal emission of the sender can be ensured when a service signal is sent. This accelerates the degradation and depreciation of the hardware of the device, and also increases the possibility of human error.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a transmitter switch high-voltage circuit, which does not need manual adjustment, loads power amplifier high voltage and controls the output power of the whole machine when a service signal is sent, can effectively reduce the total power consumption of the transmitter, save the operation cost, reduce the operation noise of the transmitter, reduce the depreciation loss of components and reduce the risk of manual misoperation or omission.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
a high-voltage circuit of a transmitter switch is electrically connected with an audio signal and comprises a level sensor chip U1, wherein a pin 1 of the level sensor chip U1 is used as a signal input end and is connected with an audio signal output end through a capacitor C1, a pin 2 of the level sensor chip U1 is connected with a pin 3 of the level sensor chip through an adjustable resistor VR1, a pin 3 of the level sensor chip U1 is grounded through a capacitor C3, a pin 4 of the level sensor chip U1 is grounded, a pin 5 of the level sensor chip U1 is grounded through a capacitor C5, a pin 8 of the level sensor chip U1 is connected with a pin 6 of a board card J1 through a switch SW1, and the input end of the switch SW1 is connected with a pin 6 of the board J1 and outputs + 5V; the board J1 is connected with a transmitter terminal interface board (named TB3), and 3 pins of the board J1 output audio signals; a pin 6 of the level sensor chip U1 is used as a high-voltage pulse starting pin, and a pin 7 is used as a high-voltage pulse closing pin;
the 6 pins of the level sensor chip U1 are connected with the 1 pin of the multivibrator chip U5A, the 3 pins of the multivibrator chip U5A are reset pins which are connected with the 4 pins of the board card J1 and connected with the switch SW1 through the resistor R9, the 13 pins of the multivibrator chip U5A are connected with the photoelectric coupler U6 through the resistor R4 and the light emitting diode D3 in sequence, and the photoelectric coupler U6 is connected with the 5 pins of the board card J1 and outputs a +5V voltage short pulse to realize automatic high voltage starting; the pins SW1 and 14 of the 2-pin connecting switch of the multivibrator chip U5A are connected with the pin 15 of the multivibrator chip U5 through a capacitor C10, and the pin 15 of the multivibrator chip U5 is connected with a switch SW1 through a resistor R6;
the pin 7 of the level sensor chip U1 is connected with the pin 2 of the timer chip U3 through a capacitor C7, the pin 2 of the timer chip U3 is also connected with a switch SW1 through a resistor R8, the pin 1 of the timer chip U3 is grounded, the pin 5 is grounded through a capacitor C9, the pin 6 is grounded through a capacitor C8, the pin 7 of the timer chip U3 is connected with the pin 6 of the timer chip U3 on one hand and connected with the pin 4 and the pin 8 of the timer chip U3 through an adjustable resistor VR3 on the other hand, the pin 8 of the timer chip U3 is also connected with the switch SW1, and the pin 3 of the timer chip U3 is used as a signal output pin and is connected with the pin 9 of the multivibrator chip U5B;
the +5V pin and the 11 pin of the multivibrator chip U5B are connected with the 4 pin of the phase inverter U4, the 2 pin of the phase inverter U4 is a signal input pin and is connected with the 4 pin of the board card J1, the 3 pin of the phase inverter U4 is grounded, and the 5 pin of the phase inverter U4 is a VCC pin; the pin 6 of the multivibrator chip U5B is connected with a capacitor C11, the other end of the capacitor C11 is connected with the pin 6 of the multivibrator chip U5B and is connected with a switch SW1 through a resistor R7; the 5 feet of the multivibrator chip U5B are connected with a photoelectric coupler U7 through a resistor R5 and a light emitting diode D4 in sequence, and the photoelectric coupler U7 is connected with the 5 feet of the board card J1 and outputs a short pulse of +5V voltage to realize automatic high voltage closing.
The technical scheme of the invention is further improved as follows: the model of the level sensor chip U1 is NJM2072, the model of the timer chip U3 is NE555, and the models of the photocouplers U7 and U6 are both PC 817.
The technical scheme of the invention is further improved as follows: multivibrator chip U5 is a resettable dual-trigger monostable multivibrator chip.
The technical scheme of the invention is further improved as follows: the pin 7 of the level sensor chip U1 is also connected to the switch SW1 via the light emitting diode D2 and the resistor R1 in sequence, and the pin 6 of the level sensor chip U1 is also connected to the switch SW1 via the light emitting diode D1 and the resistor R2 in sequence.
The technical scheme of the invention is further improved as follows: the nominal value of the adjustable resistor VR2 is 100K Ω, the led D2 is a red led, and the led D1 is a green led.
Due to the adoption of the technical scheme, the invention has the beneficial effects that:
the invention upgrades the existing KEY & PTT signal conversion circuit, generates a signal for controlling the high voltage of a switch of a transmitter by using Audio Frequency (AF) signal conversion, controls the start and stop of the transmitter and transmits the signal, improves and optimizes the conversion performance of the KEY & PTT signal, and avoids the long-time start condition of PA PWR (power amplification) and KEY & PTT (Push to Hold, Push to Push). The high voltage of the power amplifier is loaded when a service signal is sent, the output power of the whole machine is controlled, and the high voltage of the power amplifier is closed by the transmitter when no service signal exists, so that the total power consumption of the transmitter in operation can be effectively reduced, the operation cost can be saved, the operation noise of the transmitter can be reduced, the depreciation loss of components can be reduced, and the risk of manual misoperation or omission can be reduced.
The high-voltage circuit of the transmitter switch is designed autonomously by adopting a mode of combining a modularized chip and discrete components on a hardware level, upgrades and changes the KEY & PTT conversion circuit, adopts a digital mode, further simplifies the circuit structure, reduces or removes manual adjustment links, eliminates the hidden danger of capacitor damage of the original design, improves the applicability, and improves the sensitivity, the response speed and the working stability of the circuit. And manufacturing a PA ON signal control module, integrating the PA ON signal control module into a KEY & PTT and PA ON comprehensive signal control module, additionally installing the PA ON signal control module into the transmitter, outputting a control signal to a corresponding port or an access point of the transmitter, and controlling the high-voltage action of the switch of the transmitter in real time according to a service audio signal.
Drawings
Fig. 1 is a circuit diagram of a control board of a transmitter according to the present invention;
FIG. 2 is a schematic diagram of the control circuit of the present invention;
fig. 3 is a signal waveform diagram of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples.
The invention discloses a high-voltage circuit of a transmitter switch, which comprises a level sensor chip U1, a timer chip U3, an inverter U4, a multivibrator chip U5A, a multivibrator chip U5B, a photoelectric coupler U7 and a photoelectric coupler U6.
Specific circuit layout referring to fig. 1 to 3, fig. 1 is a circuit layout diagram drawn for convenience of PCB manufacturing, and fig. 2 is a schematic diagram of functional implementation.
The specific scheme is as follows: the audio signal processing circuit is electrically connected with an audio signal and comprises a level sensor chip U1, wherein a pin 1 of the level sensor chip U1 is used as a signal input end and is connected with an audio signal output end through a capacitor C1, a pin 2 of the level sensor chip U1 is connected with a pin 3 of the level sensor chip through an adjustable resistor VR1, a pin 3 of a level sensor chip U1 is grounded through a capacitor C3, a pin 4 of the level sensor chip U1 is grounded, a pin 5 of the level sensor chip U1 is grounded through a capacitor C5, a pin 8 of the level sensor chip U1 is connected with a pin 6 of a board card J1 through a switch SW1, and an input end of a switch SW1 is connected with a pin 6 of a board card J1 and outputs + 5V; the board J1 is connected with a transmitter terminal interface board (named TB3, not shown in the figure), and 3 pins of the board J1 output audio signals; a pin 6 of the level sensor chip U1 is used as a high-voltage pulse starting pin, and a pin 7 is used as a high-voltage pulse closing pin;
a pin 6 of a level sensor chip U1 is connected with a pin 1 of a multivibrator chip U5A, a pin 3 of the multivibrator chip U5A is a reset pin which is connected with a pin 4 of a board card J1 and is connected with a switch SW1 through a resistor R9, a pin 13 of the multivibrator chip U5A is connected with a photoelectric coupler U6 through a resistor R4 and a light-emitting diode D3 in sequence, and the photoelectric coupler U6 is connected with a pin 5 of a board card J1 and outputs a short pulse of +5V voltage to realize automatic high voltage starting; the pins SW1 and 14 of the 2-pin connecting switch of the multivibrator chip U5A are connected with the pin 15 of the multivibrator chip U5 through a capacitor C10, and the pin 15 of the multivibrator chip U5 is connected with a switch SW1 through a resistor R6;
the pin 7 of the level sensor chip U1 is connected with the pin 2 of the timer chip U3 through a capacitor C7, the pin 2 of the timer chip U3 is also connected with a switch SW1 through a resistor R8, the pin 1 of the timer chip U3 is grounded, the pin 5 is grounded through a capacitor C9, the pin 6 is grounded through a capacitor C8, the pin 7 of the timer chip U3 is connected with the pin 6 of the timer chip U3 on one hand and connected with the pin 4 and the pin 8 of the timer chip U3 through an adjustable resistor VR3 on the other hand, the pin 8 of the timer chip U3 is also connected with the switch SW1, and the pin 3 of the timer chip U3 is used as a signal output pin and is connected with the pin 9 of the multivibrator chip U5B;
the pin 10 +5V and the pin 11 of the multivibrator chip U5B are connected with the pin 4 of the inverter U4, the pin 2 of the inverter U4 is a signal input pin and is connected with the pin 4 of the board card J1, the pin 3 of the inverter U4 is grounded, and the pin 5 is a VCC pin; the pin 6 of the multivibrator chip U5B is connected with a capacitor C11, the other end of the capacitor C11 is connected with the pin 6 of the multivibrator chip U5B and is connected with a switch SW1 through a resistor R7; the 5 th pin of the multivibrator chip U5B is connected with a photoelectric coupler U7 through a resistor R5 and a light emitting diode D4 in sequence, and the photoelectric coupler U7 is connected with the 5 th pin of the board card J1 and outputs a short pulse of +5V voltage to realize automatic high-voltage closing.
Specifically, the model of the level sensor chip U1 is NJM2072, the model of the timer chip U3 is NE555, and the models of the photocouplers U7 and U6 are both PC 817.
Specifically, multivibrator chip U5 is a resettable dual-trigger monostable multivibrator chip.
Specifically, the pin 7 of the level sensor chip U1 is further connected to the switch SW1 via the light emitting diode D2 and the resistor R1 in sequence, and the pin 6 of the level sensor chip U1 is further connected to the switch SW1 via the light emitting diode D1 and the resistor R2 in sequence.
Specifically, the nominal value of the adjustable resistor VR2 is 100K Ω, the led D2 is a red led, and the led D1 is a green led.
The invention also discloses a power amplifier circuit for starting and stopping the switch of the transmitter, which is also electrically connected with the audio signal and comprises a level sensor chip, wherein a pin 1 of the level sensor chip is used as a signal input end and is connected with the audio signal through a capacitor C2, a pin 2 of the level sensor chip is connected with a pin 3 of the level sensor chip through an adjustable resistor VR2, the pin 3 of the level sensor chip is grounded through a capacitor C4, a pin 4 of the level sensor chip is grounded, a pin 5 of the level sensor chip is grounded through a capacitor C6, and a pin 6 of the level sensor chip is used as a signal output end.
The 6 pins of the level sensor chip are connected with the 2 pins of the board card J1 on one hand, the 6 pins of the level sensor chip are sequentially connected with the light-emitting diode D6, the light-emitting diode D5 and the resistor R3 on the other hand, the other end of the resistor R3 is connected with the 6 pins of the board card J1, the 1 pin of the board card J1 is grounded, the 3 pins of the board card J1 are respectively connected with the capacitor C2 and the signal input end of the switch high-voltage circuit, the 4 pins of the board card are connected with the high-low voltage inverted input end of the switch high-voltage circuit, and the 5 pins of the board card are connected with the signal output end of the switch high-voltage circuit;
the 3-pin output Audio (AF) signal of the board J1.
Preferably, the model number of the level sensor chip is NJM2072, the light emitting diode D5 is a yellow light emitting diode, the capacitor C6 is a polar capacitor (22 μ F), and the nominal value of the adjustable resistor VR2 is 100K Ω. The capacitor C4 is 104pF, the capacitor C2 is 10 muF, the light emitting diode D6 and the light emitting diode D5 are IN4148, and the resistor R3 is 1K omega.
The high-voltage circuit of the transmitter switch is arranged at the output end of the switch SW1, and the power amplification circuit of the transmitter switch start-stop is connected with the input end of the switch SW 1. The transmitter switch start-stop power amplifier circuit can be used by combining the circuit in the figure, and other switch start-stop power amplifier circuits can also be adopted.
Taking fig. 1 as an example, the circuit operating principle is as follows:
aiming at the KEY & PTT start-stop power amplification function, an Audio (AF) signal enters through a pin 1 and is output through a pin 6 of a signal level sensor chip U2 (NJM2072, a voice control circuit), when an audio service signal enters, the pin 6 is steeply pulled from a high level to a low level and is output to a pin 5 of a transmitter TB2, and the power transmission of the transmitter is controlled.
For the PA ON switch high voltage function, Audio (AF) signals enter via pin 1, pin 6 and pin 7 of the signal level sensor chip U1 (NJM 2072). The 6 feet of U1 are for opening high voltage pulse foot, and when Audio Frequency (AF) signal got into 6 feet from high level set low level, get into the 1 foot (the low level is effective) of the double-trigger monostable multivibrator chip U5 chip (74HC123) that can reset, ON the premise that 3 feet reset port set high level of U5 chip, export a forward pulse from 13 feet, drive photocoupler U6 work, and export 5V voltage short pulse and give exciter PA ON ON-off switch corresponding pin, realize the automatic high voltage that opens. The pin 7 of U1 is a pin for closing high-voltage pulse, when an Audio (AF) signal is cut off, the pin 7 is set to be at low level from high level after short time delay, and a differential circuit (the formula of the differential circuit is as follows) built by C7 and R8 is utilized
) When the R8 × C7 is far smaller than T/2 (T is a square wave period), a falling edge sharp-bottom wave is output, the level is pulled down instantaneously, and the falling edge sharp-bottom wave is sent to pin 2 (pin 2 is a trigger pin, and the low level is valid) of the NE555 timer chip U3, the time delay duration can be changed by adjusting the sizes of the peripheral variable resistor VR3 and the capacitor C8, and the time delay duration is sent to pin 9 of U5B through pin 3. At this time, the high-voltage state is achieved, a low level can be obtained from a pin 9 of a transmitter terminal interface board TB3, the low level is accessed into a circuit through a pin 4 of a board card J1 interface, the 3 pin of U5A is firstly sent, the low level is set to be in a low level reset state, the low level is converted into a high level through an inverter U4(74AHC1G04) and then sent into a pin 11 of U5B to enable U5B to work, meanwhile, a low level is obtained after the delay of a 555 timer chip (the delay time tw in the circuit is 1.1 VR 3C 8), a forward pulse is similarly output from a port 5 of U5B, a short pulse coupler U7 is driven to work, and a 5V voltage is output to a corresponding pin of an exciter PA ON-switch key, so that the high voltage is automatically turned off.
Considering the KEY & PTT signal for controlling the transmitter to start and stop the power amplifier, the current scheme is to generate the KEY & PTT signal by Audio (AF) signal conversion in the manner of "amplification-rectification-voltage division sampling-analog switch" and to access the corresponding interface of the transmitter for use. This circuit design has certain shortcomings: the method is mainly designed in a simulation mode, manual adjustment is needed, and parameter adjustment indexes are not clear enough; the sensitivity, stability and response speed of the circuit are general; individual capacitors in the circuit burn out after long-term use. Therefore, the part of the circuit is upgraded and realized in a digital mode. The response speed of the digital module is faster, the rising edge and the falling edge are vertical and steep, and the response time can reach ms and us levels; the differential circuit realizes accurate and timely triggering; the timer chip module can also calculate and design the required delay time more accurately; photoelectric coupler U7 then through the two very big promotion electrical isolation of conversion of electric light and photoelectricity signal, effectual suppression electric interference, very big promotion response speed and comprehensive interference killing feature.
In order to visually judge the fault and facilitate debugging, the light-emitting diodes with different colors are connected into the main circuit path, so that the in-use state monitoring and the subsequent operation and maintenance guarantee work are facilitated.
In the circuit, in order to adapt to different service types and characteristics, a switch is specially arranged for starting or closing a high-voltage start-stop function, and for services such as Automatic Repeat-reQuest (ARQ) or Forward Error Correction (FEC), idle signal input is continuously performed, and the high voltage does not need to be frequently started or closed. And for DSC (digital selective calling), NAVTEX (navigation warning telex), SSB (synchronous signal) and weather facsimile and other services, the services are broadcast at irregular time or intermittently, no idle signal exists in the non-broadcast period, and in order to reduce the misoperation rate of manually switching on and off the high voltage, a high-voltage start-stop circuit can be introduced to timely and accurately process the requirements of the services.
Circuit waveform monitoring
According to KEY&The PTT and PA ON control circuit is characterized in that when an audio signal is input, the waveform is shown as TP1, the waveform does not reflect the amplitude diminishing trend change of the audio signal at the initial and tail sound stages, and the circuit analysis is not influenced. For KEY&The PTT starts and stops the power amplifier function, the Audio Frequency (AF) signal inputs 1 foot of U2, the output is TP9(XMT) waveform, the Audio Frequency (AF) signal begins the stage and realizes the high level and sets the low level to change, control the sender to start the power amplifier output power; and in the tail sound stage of the Audio (AF) signal, low-level setting and high-level conversion are realized, and the transmitter is controlled to stop the power amplifier output power. For the switching high voltage function, an Audio (AF) signal is input to pin 1 of U1, a waveform such as TP2 is output from pin 6 of U1, and a high level sets a low level. At this time
The pin is connected with 5V and the pull-up resistor, and is in a high level state, namely, a 3 pin high level of the set U5A and a 11 pin low level of the U5B, the U5A is in a working state, and the U5B is in a low level reset state. Therefore, after the 6-pin signal of the U1 is input to the 1-pin of the U5A, a short pulse signal with a waveform like TP6 is output from the 13-pin, the action of the photoelectric coupler U6 is controlled, and a 5V short pulse voltage signal is further generated and input to a corresponding pin of a PA ON button of an exciter switch panel, so that the function of starting high voltage is realized. After the Audio Frequency (AF) signal is input into U1, a pulse signal with a TP3 waveform is output from 7 pins at the same timeAnd the conversion from low level to high level is realized, the level is set from high level to low level in the tail stage of an Audio Frequency (AF) signal, a transient low level pulse is generated after the low level pulse is optimized by a differential circuit and is input to a 555 timer U3 module, and a time delay long pulse signal such as TP5 is output from a pin 7 of U3. At this time, a state where the high voltage is turned on,
the pin is set to be in a low level from the exciter end, the 3 pin low level of U5A and the 11 pin high level of U5B are set after the input circuit, and therefore U5A is in a low level reset state, and U5B is in a working state. In the end sound stage of the delay long pulse signal, the conversion from high level setting to low level is realized, the conversion is input to the pin 9 of the U5B, a short pulse signal such as TP7 is output from the pin 5, the action of the photoelectric coupler U7 is controlled, and then a 5V short pulse voltage signal is generated and input to the corresponding pin of the PA ON button of the exciter switch panel, so that the function of closing the high voltage is realized. The TP8 waveform is a comprehensive body of TP6 and TP7 waveforms, and vividly shows the appearance time node and waveform morphological characteristics of the short voltage pulse of the switching high voltage. The digital module has the characteristics of high integration level, complete functions, accurate parameters, sensitive and rapid response of waveform parameters, less temperature drift, stable work and the like, and can effectively meet and improve the requirement of transmitting an Audio (AF) signal of a transmitter. KEY&The PTT and PA ON control circuit signal waveforms are shown in fig. 3.
Wiring method
The circuit start-stop power amplifier part needs to conveniently access an Audio (AF) signal and a lead-out Key (XMT) signal, and takes power and goes to the ground at a proper position; the high-voltage part of the switch needs to send electric pulses for opening high voltage and closing high voltage which are optically coupled into corresponding pins of an PA ON high-voltage switch of an exciter, high-voltage and low-voltage level state values before and after the high voltage are sent into a board card, and the board card is matched with an inverter to control the part A or B of a U5 chip to work (U5A works before the high voltage, U5B is in a low-level reset state to control the high voltage to be opened at any time, and U5A works after the high voltage is in a low-level reset state, and U5B works to control the high voltage to be closed at any time). Meanwhile, the pin 19 of the TB3 needs to be connected to the ground 20, so that the pin 9 can normally feed back the change state of the operating level. The design circuit is small and exquisite and easy to install, and can judge obstacles in time and be convenient to replace when a fault occurs. The terminal interface unit is installed in the lower rear terminal interface unit of the machine and fixed on the inner wall of the unit box in an overhead mode through insulating columns so as to meet basic conditions of circuit operation.
The design circuit is provided with six wiring terminals which are respectively a power supply (5VDC), a Ground (GND), an audio signal input (AF), a KEY keying output signal (XMT SW), a PA ON switch high-voltage electric pulse output signal (PA PWR SW) and a switch high-voltage state level input signal (PA ON) and are respectively connected to corresponding wiring ports of terminal interface units TB2, TB3, J411 and an exciter PA ON switch button. Specific wiring information is shown in table 1. The terminal interface unit connection port is defined in table 2. The exciter switch panel wiring port is defined in table 3.
TABLE 1 KEY & PTT and PA ON control circuit wiring table
TABLE 2 terminal interface Unit terminal port table
TABLE 3 exciter switch panel terminal port table
3.5 Circuit efficiency measurement
According to the condition of a power amplification level main power amplifier of a transmitter corresponding to the project, the 10kW transmitter main power amplification level comprises 20 power amplifier modules, and the 5kW transmitter main power amplification level comprises 10 power amplifier modules; according to the static current value 4A/power amplifier module and the high voltage of the power amplifier circuit 80VDC of the transmitter of 7 series models (JRS-714 and JRS-753) of the brand, the static current value 2A/power amplifier module and the high voltage of the power amplifier circuit 110VDC of the transmitter of 9 series models (JRS-914 and JRS-953), the power-saving calculation value is calculated according to the standby time of 12 hours when each transmitter works every day, and the energy-saving calculation value is shown in a table 3. Estimated according to the long-term energy-saving benefit, the annual electric quantity of a 5kW JRS953 type transmitter exceeds 1 ten thousand degrees (kW.h), and the annual electric quantity of a 10kW JRS914 type transmitter exceeds 2 ten thousand degrees (kWh.h). The estimated design project operation energy-saving efficiency is obvious.
Table 4 energy-saving measuring and calculating table for KEY & PTT and PA ON control circuit
After the Guangzhou coast radio station is integrally transformed, a JRC communicator is mainly used. The partial sender covers all the transmission service types of the center, wherein, the partial service types have the characteristic of broadcasting in an indefinite or intermittent way, and no idle signal exists in the non-broadcasting period. The signal sent to the signal sending station by the central control system at present has no independent control signal for switching on/off the high voltage and starting/stopping the power amplifier, and the high voltage of the signal sending machine needs to be kept in an on state for a long time, so that the signal sending machine can be ensured to normally send when a service signal is sent. The JRC short-wave transmitter adopts a digital mode to upgrade the existing PTT & KEY signal conversion circuit, integrates and adds a high-voltage switch control circuit, effectively achieves the purposes of reducing energy consumption, noise and hardware breakage and artificial misoperation risk, improves the integral operation quality of the transmitter and improves the signal transmission guarantee capability.
Claims (5)
1. A transmitter switch high voltage circuit, comprising: the audio signal processing circuit is electrically connected with an audio signal and comprises a level sensor chip U1, wherein a pin 1 of the level sensor chip U1 is used as a signal input end and is connected with an audio signal output end through a capacitor C1, a pin 2 of the level sensor chip U1 is connected with a pin 3 of the level sensor chip through an adjustable resistor VR1, a pin 3 of a level sensor chip U1 is grounded through a capacitor C3, a pin 4 of the level sensor chip U1 is grounded, a pin 5 of the level sensor chip U1 is grounded through a capacitor C5, a pin 8 of the level sensor chip U1 is connected with a pin 6 of a board card J1 through a switch SW1, and an input end of a switch SW1 is connected with a pin 6 of a board card J1 and outputs + 5V; the board card J1 is connected with a transmitter terminal interface board, and 3 pins of the board card J1 output audio signals; a pin 6 of the level sensor chip U1 is used as a high-voltage pulse starting pin, and a pin 7 is used as a high-voltage pulse closing pin;
a pin 6 of a level sensor chip U1 is connected with a pin 1 of a multivibrator chip U5A, a pin 3 of the multivibrator chip U5A is a reset pin which is connected with a pin 4 of a board card J1 and is connected with a switch SW1 through a resistor R9, a pin 13 of the multivibrator chip U5A is connected with a photoelectric coupler U6 through a resistor R4 and a light-emitting diode D3 in sequence, and the photoelectric coupler U6 is connected with a pin 5 of a board card J1 and outputs a short pulse of +5V voltage to realize automatic high voltage starting; the pins SW1 and 14 of the 2-pin connecting switch of the multivibrator chip U5A are connected with the pin 15 of the multivibrator chip U5 through a capacitor C10, and the pin 15 of the multivibrator chip U5 is connected with a switch SW1 through a resistor R6;
the pin 7 of the level sensor chip U1 is connected with the pin 2 of the timer chip U3 through a capacitor C7, the pin 2 of the timer chip U3 is also connected with a switch SW1 through a resistor R8, the pin 1 of the timer chip U3 is grounded, the pin 5 is grounded through a capacitor C9, the pin 6 is grounded through a capacitor C8, the pin 7 of the timer chip U3 is connected with the pin 6 of the timer chip U3 on one hand and connected with the pin 4 and the pin 8 of the timer chip U3 through an adjustable resistor VR3 on the other hand, the pin 8 of the timer chip U3 is also connected with the switch SW1, and the pin 3 of the timer chip U3 is used as a signal output pin and is connected with the pin 9 of the multivibrator chip U5B;
the +5V pin and the 11 pin of the multivibrator chip U5B are connected with the 4 pin of the phase inverter U4, the 2 pin of the phase inverter U4 is a signal input pin and is connected with the 4 pin of the board card J1, the 3 pin of the phase inverter U4 is grounded, and the 5 pin of the phase inverter U4 is a VCC pin; the pin 6 of the multivibrator chip U5B is connected with a capacitor C11, the other end of the capacitor C11 is connected with the pin 6 of the multivibrator chip U5B and is connected with a switch SW1 through a resistor R7; the 5 th pin of the multivibrator chip U5B is connected with a photoelectric coupler U7 through a resistor R5 and a light emitting diode D4 in sequence, and the photoelectric coupler U7 is connected with the 5 th pin of the board card J1 and outputs a short pulse of +5V voltage to realize automatic high-voltage closing.
2. The transmitter switching high voltage circuit of claim 1, wherein: the model of the level sensor chip U1 is NJM2072, the model of the timer chip U3 is NE555, and the models of the photocouplers U7 and U6 are both PC 817.
3. The transmitter switching high voltage circuit of claim 2, wherein: multivibrator chip U5 is a resettable dual-trigger monostable multivibrator chip.
4. The communicator switch high voltage circuit of claim 3, wherein: the pin 7 of the level sensor chip U1 is also connected to the switch SW1 via the light emitting diode D2 and the resistor R1 in sequence, and the pin 6 of the level sensor chip U1 is also connected to the switch SW1 via the light emitting diode D1 and the resistor R2 in sequence.
5. The transmitter switching high voltage circuit of claim 4, wherein: the nominal value of the adjustable resistor VR2 is 100K Ω, the led D2 is a red led, and the led D1 is a green led.
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| CN202210604067.0A CN115001514A (en) | 2022-05-30 | 2022-05-30 | High-voltage circuit of transmitter switch |
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| US20060039449A1 (en) * | 1997-05-16 | 2006-02-23 | Fontana Robert J | Ultra-wideband receiver and transmitter |
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| US20210288720A1 (en) * | 2017-04-18 | 2021-09-16 | Fujian Eochip Semiconductor Co., Ltd | Receiving and sending integrated chip for olt |
| CN217307675U (en) * | 2022-05-30 | 2022-08-26 | 交通运输部南海航海保障中心广州通信中心 | High-voltage circuit for transmitter switch |
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2022
- 2022-05-30 CN CN202210604067.0A patent/CN115001514A/en active Pending
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| US20060039449A1 (en) * | 1997-05-16 | 2006-02-23 | Fontana Robert J | Ultra-wideband receiver and transmitter |
| WO2015010475A1 (en) * | 2013-07-25 | 2015-01-29 | 深圳市明微电子股份有限公司 | Switch power supply driving chip and switch power supply driving circuit |
| US20210288720A1 (en) * | 2017-04-18 | 2021-09-16 | Fujian Eochip Semiconductor Co., Ltd | Receiving and sending integrated chip for olt |
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