CN111817737B - Signal frequency control circuit of radio communication system - Google Patents
Signal frequency control circuit of radio communication system Download PDFInfo
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- CN111817737B CN111817737B CN202010750822.7A CN202010750822A CN111817737B CN 111817737 B CN111817737 B CN 111817737B CN 202010750822 A CN202010750822 A CN 202010750822A CN 111817737 B CN111817737 B CN 111817737B
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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
- H04B1/06—Receivers
- H04B1/10—Means associated with receiver for limiting or suppressing noise or interference
- H04B1/12—Neutralising, balancing, or compensation arrangements
- H04B1/123—Neutralising, balancing, or compensation arrangements using adaptive balancing or compensation means
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
- H03F1/302—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters in bipolar transistor amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/04—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
- H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
- H03H7/01—Frequency selective two-port networks
- H03H7/06—Frequency selective two-port networks including resistors
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Abstract
The invention provides a signal frequency control circuit of a radio communication system, which comprises a frequency collector and a control terminal and effectively solves the problem that the accuracy of analyzing communication signals by the control terminal is influenced because the communication signals received by the control terminal are distorted. According to the invention, the frequency of a communication signal of a radio communication system is acquired by the frequency acquisition device U1, impedance matching is firstly carried out and then amplification is carried out, the amplified communication signal is output to the resonant circuit and is responsible for selecting the frequency of the communication signal, the frequency is calculated by the operation circuit together with the frequency of a standard communication signal, the frequency difference of the two signals is obtained by the second-order active low-pass filter, the frequency difference is fed back to the resonant circuit for frequency re-selection, frequency calibration is realized, and the problem that the accuracy of analysis on the communication signal by the control terminal is influenced due to communication signal distortion is solved.
Description
Technical Field
The invention relates to the field of radio communication, in particular to a signal frequency control circuit of a radio communication system.
Background
With the grasp of human beings on scientific technology, the transmission mode of information is from beacon transmission in the period of construction to pigeon transmission, and finally, the existing radio communication is adopted, the improvement of the information transmission mode greatly shortens the time occupied by information transmission, and the work and life of people are facilitated.
In the actual use process, when a radio communication system is used for transmitting communication signals, a frequency collector or an antenna is mostly used for receiving the communication signals and transmitting the communication signals to a control terminal for signal analysis so as to obtain transmitted data information, and when the radio communication system is used for transmitting the communication signals at a long distance, phenomena such as attenuation and interference mixing of other frequencies occur, so that a frequency error exists between the communication signals received by the control terminal and standard communication signals, the frequency error can be ignored when the error is small, but when the error is large, the communication signals received by the control terminal are distorted, so that the accuracy of the analysis of the communication signals by the control terminal is affected, and the prior art generally calibrates the amplitude of the communication signals and cannot effectively reduce the frequency error of the communication signals.
The present invention therefore provides a new solution to this problem.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a signal frequency control circuit of a radio communication system, which effectively solves the problem that the accuracy of analyzing communication signals by a control terminal is influenced by the distortion of the communication signals received by the control terminal.
The technical scheme includes that the signal frequency control circuit of the radio communication system comprises a frequency collector and a control terminal, the frequency collector and the control terminal sequentially pass through a frequency control circuit and a voltage stabilization output circuit, communication signals collected by the frequency collector U1 are subjected to impedance matching and amplification, frequency selection is carried out on the communication signals, multiplication operation is carried out on the communication signals and standard communication signals, frequency selection is carried out again by using a frequency difference obtained by the multiplication operation, the selected communication signals are subjected to voltage stabilization through the voltage stabilization output circuit, when the amplitude of the communication signals is not within a range provided by the voltage stabilization output circuit, the communication signals are re-amplified, and the output end of the voltage stabilization output circuit is connected with the control terminal.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages:
(1) the communication signal is selected by a resonance circuit consisting of a resistor R8, a capacitor C7, a capacitor C8 and an inductor L2, a second-order active low-pass filter consisting of a resistor R12, a resistor R13, a resistor R10, a resistor R11, a capacitor C9 and a capacitor C10 is used for filtering out the frequency sum between the communication signal and the standard communication signal obtained by an arithmetic circuit consisting of an analog multiplier U3, a resistor R7 and a resistor R14, only the frequency difference between the communication signal and the standard communication signal is fed back to the resonance circuit, the error of the communication signal is reduced, and the problems that the communication signal received by a control terminal is distorted and the accuracy of analysis of the communication signal by the control terminal is influenced are solved;
(2) the communication signal is amplified by an amplifying circuit consisting of a resistor R4, a resistor R5, a triode Q1, a resistor R6 and a capacitor C5, and the communication signal with the amplitude not between 0.7V and 5.7V is fed back to the amplifying circuit for re-amplification by a voltage regulator tube D3, a voltage regulator tube D4, a bidirectional trigger tube D2 and a thyristor SCR through a resistor R15, so that voltage stabilization is realized, and the control terminal can conveniently analyze the data of the communication signal.
Drawings
Fig. 1 is a schematic circuit diagram of the present invention.
Detailed Description
The foregoing and other technical and other features and advantages of the invention will be apparent from the following detailed description of the embodiments, which proceeds with reference to fig. 1. The structural contents mentioned in the following embodiments are all referred to the attached drawings of the specification.
Exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
A signal frequency control circuit of a radio communication system is applied between a frequency collector U1 and a control terminal and comprises a frequency control circuit and a voltage stabilization output circuit, wherein the type adopted by the frequency collector U1 is SJ-ADC, the frequency of a communication signal collected by the frequency collector U1 is processed by the frequency control circuit and then transmitted to the voltage stabilization output circuit for voltage stabilization processing, and finally transmitted to the control terminal for data analysis, the frequency control circuit utilizes the frequency of the communication signal collected by the frequency collector U1 of the SJ-ADC to avoid the loss of the communication signal caused by impedance mismatching when the communication signal is transmitted to the rear stage, the communication signal collected by the frequency collector U1 is transmitted to an impedance matching circuit consisting of an over-inductor L1, a resistor R3, a capacitor C2 and a capacitor C3 through a resistor R2 to carry out impedance matching, the communication signal is transmitted to an amplifying circuit consisting of a resistor R4, a resistor R5, a triode Q1, a resistor R6 and a capacitor C5 through a capacitor C4 to amplify the communication signal, then the amplified communication signal is output to a resonant circuit consisting of a resistor R8, a capacitor C7, a capacitor C8 and an inductor L2, the frequency of the communication signal is selected, the communication signal is not mixed with other frequencies at the moment, the communication signal at the moment is output to an I1 pin of an analog multiplier U3 through the resistor R7 to be operated with a standard communication signal on an I2 pin of the analog multiplier, so that two frequency signals are obtained, the analog multiplier U3, the resistor R7 and the resistor R14 form an operation circuit, the difference between the sum of the frequency of the communication signal and the standard communication and the frequency is output to a second-order active low-pass filter consisting of the resistor R12, the resistor R13, the resistor R10, the resistor R11, the capacitor C9 and the capacitor C10 from an output end of the analog multiplier U3, the second-order active low-pass filter filters the sum of high-frequency frequencies, only allows the difference between the frequencies of the communication signals and standard communication signals to pass through, and after the difference is amplified by an operational amplifier U2B, the difference is fed back to a resonant loop consisting of a resistor R8, a capacitor C7, a capacitor C8 and an inductor L2 through a resistor R9 to carry out frequency re-selection so as to select the frequency of the communication signals which is closest to the standard frequency signals, the frequency is transmitted to a voltage-stabilizing output circuit through a diode D1, the amplitude of the communication signals is controlled between 0.7V and 5.7V by using a voltage-stabilizing tube D3 and a voltage-stabilizing tube D4, when the amplitude of the communication signals is lower than 0.7V or higher than 5.7V, the voltage-stabilizing tube D3 or a voltage-stabilizing tube D4 is conducted, the voltage-stabilizing tube D3 or a voltage-stabilizing tube D4 is used for charging the capacitor C13, the bidirectional trigger tube 39D 2 is conducted after the amplitude of the communication signals is fully charged, and then the base of a thyristor SCR 1 9 is conducted again for amplifying the triode Q2, to achieve a voltage stabilizing effect, and when the amplitude of the communication signal is between 0.7V and 5.7V, the communication signal is further resonated by the resistor R17, the inductor L3, the capacitor C11 and the capacitor C12 and finally transmitted to the control terminal, the data analysis is performed on the communication signal by the control terminal, the communication signal is selected through a resonant circuit consisting of a resistor R8, a capacitor C7, a capacitor C8 and an inductor L2, a second-order active low-pass filter consisting of a resistor R12, a resistor R13, a resistor R10, a resistor R11, a capacitor C9 and a capacitor C10 is used for filtering out the frequency sum between the communication signal obtained by an arithmetic circuit consisting of an analog multiplier U3, a resistor R7 and a resistor R14 and the standard communication signal, only the frequency difference between the communication signal and the standard communication signal is fed back to the resonant circuit, so that the problem that the accuracy of analyzing the communication signal by the control terminal is influenced due to the distortion of the communication signal received by the control terminal is solved;
the frequency control circuit adopts a frequency collector U1 with the model of SJ-ADC to collect the frequency of a communication signal of a radio communication system, a positive polarity power supply VCC supplies power to a frequency collector U1 through a resistor R1, a capacitor C1 is used for filtering out ripples mixed in the positive polarity power supply VCC so as to avoid influencing the frequency of the communication signal collected by the frequency collector U1, in order to avoid the loss caused by impedance mismatching when the communication signal is transmitted to the rear stage, the communication signal collected by the frequency collector U1 is transmitted to an impedance matching circuit consisting of an inductance L1, a resistor R3, a capacitor C2 and a capacitor C3 through a resistor R2 so as to carry out impedance matching on the communication signal, the communication signal can be transmitted to the rear stage without loss and effectively, in order to reduce the attenuation of the signal in the transmission process, the communication signal is transmitted to an amplifying circuit consisting of a resistor R4, a resistor R5, a triode Q1, a resistor R6 and a capacitor C5 so as to amplify the communication signal, the resistor R4 and the resistor R5 form a voltage dividing circuit to provide a proper base voltage for the triode Q1, the resistor R6 and the capacitor C5 are used to stabilize the static operating point of the triode Q1, so that the triode Q1 can be stabilized in an amplification state, the amplified communication signal is output to a resonant circuit formed by the resistor R8, the capacitor C7, the capacitor C8 and the inductor L2, the frequency of the communication signal is selected to avoid interference of signals of other frequencies on the communication signal, the communication signal is not mixed with other frequencies at the moment, the communication signal at the moment is output to an I1 pin of an analog multiplier U3 through the resistor R7 to be operated with a standard communication signal on an I2 pin of the analog multiplier, so as to obtain two frequency signals, the analog multiplier U3, the resistor R7 and the resistor R14 form an operation circuit, one frequency signal is the sum of the frequencies of the communication signal and the standard communication, the other is the difference between the communication signal and the standard communication frequency, the frequency sum of the two signals is a high-frequency signal compared with the frequency difference, the frequency difference between the frequency sum of the communication signal and the standard communication is output from the output end of the analog multiplier U3 to a second-order active low-pass filter composed of a resistor R12, a resistor R13, a resistor R10, a resistor R11, a capacitor C9 and a capacitor C10, the second-order active low-pass filter filters the frequency sum of the high frequency, only the frequency difference between the communication signal and the standard communication signal is allowed to pass, after the frequency difference is amplified by an operational amplifier U2B, the frequency sum is fed back to a resonant loop composed of the resistor R8, the capacitor C7, the capacitor C8 and an inductor L2 through the resistor R9 to be reselected, so as to select the frequency of the communication signal which is the closest to the standard frequency signal, thereby avoiding the occurrence of the communication signal distortion, and the communication signal is transmitted to a voltage-stabilizing output circuit, which comprises a capacitor C1, one end of a capacitor C1 is connected to one end of a resistor R1 and a VCC pin of a frequency collector U1 and connected to a positive power supply VCC, the other end of the capacitor C1 is connected to the other end of a resistor R1, one end of a resistor R2 and an out pin of a frequency collector U1, the other end of the resistor R2 is connected to one end of an inductor L1, one end of a resistor R3 and one end of a capacitor C2, the other end of the inductor L1 is connected to the other end of the resistor R3, one end of a capacitor C4 and one end of a capacitor C3, the other end of the capacitor C4 is connected to one end of a resistor R4, one end of a resistor R5 and a base of a transistor Q1, the other end of a resistor R4 is connected to a collector of a transistor Q1, one end of a resistor R8 and one end of a resistor R9 and connected to a positive power supply VCC, the other end of a resistor R5 is connected to a gnd pin of a frequency sensor U1, the other end of a capacitor C2, the other end of a capacitor C3 and the other end of a resistor R6 are connected to positive power supply VCC, One end of a capacitor C5, one end of a capacitor C8, one end of an inductor L2, an emitter of a transistor Q1 is respectively connected to one end of a resistor R6 and one end of a capacitor C5, the other end of the resistor R8 is respectively connected to one end of a capacitor C7, the other end of an inductor L2, one end of a resistor R7, the other end of the capacitor C7 is connected to the other end of the capacitor C7, the other end of the resistor R7 is connected to an I7 pin of an analog multiplier U7, the I7 pin of the analog multiplier U7 is connected to one end of the resistor R7, the other end of the resistor R7 is connected to one end of the capacitor C7, the same-phase end of the operational amplifier U2 7, the other end of the capacitor C7 is connected to one end of the capacitor C7 and one end of the resistor R7, and the amplifier R7 are grounded, the other end of the resistor R11 is respectively connected with the inverting end of the operational amplifier U2B and one end of the resistor R10, and the other end of the resistor R10 is respectively connected with the output end of the operational amplifier U2B and the other end of the resistor R9;
the communication signal output by the frequency control circuit is transmitted to a voltage-stabilizing output circuit through a diode D1, the amplitude of the communication signal is controlled between 0.7V and 5.7V by using a voltage regulator tube D3 and a voltage regulator tube D4, when the amplitude of the communication signal is lower than 0.7V or higher than 5.7V, the voltage regulator tube D3 or the voltage regulator tube D4 is conducted, the voltage regulator tube D3 or the voltage regulator tube D4 charges a capacitor C13, the capacitor C13 is conducted after being fully charged, a bidirectional trigger tube D2 is further conducted, a thyristor SCR is further conducted, the thyristor SCR feeds the communication signal back to the base electrode of a triode Q1 through a resistor R15 to be re-amplified so as to realize the effect of voltage stabilization, and when the amplitude of the communication signal is between 0.7V and 5.7V, the communication signal is further resonated through the resistor R17, the inductor L3, the capacitor C11 and the capacitor C12 so as to avoid interference in the communication signal from being mixed in the communication signal to affect a voltage stabilizing circuit, the frequency of a communication signal which is achieved by a resonant circuit formed by a resistor R8, a capacitor C7, a capacitor C8 and an inductor L2 can be adjusted by changing a magnetic core coil winding of the inductor L3, and finally the frequency is transmitted to a control terminal, the communication signal is subjected to data analysis by using the control terminal, the control terminal comprises a thyristor SCR, the cathode of the thyristor SCR is respectively connected with the anode of a diode D1, the output end of an analog multiplier U3 of a frequency control circuit and one end of a resistor R13, the anode of the thyristor SCR is connected with one end of the resistor R15, the other end of a resistor R15 is respectively connected with the other end of the capacitor C4 of the frequency control circuit, one end of a resistor R4, one end of the resistor R5 and the base of a triode Q1, the cathode of the diode D1 is respectively connected with the anode of a voltage regulator D3, the cathode of the voltage regulator D4, one end of the resistor R17, one end of the control terminal of a capacitor C11, and the control terminal of the SCR, the control pole of the bidirectional trigger D2 is connected with one end of the thyristor D2, the other end of the bidirectional trigger tube D2 is connected with the negative electrode of a voltage regulator tube D3, one end of a resistor R18, one end of a capacitor C13 and one end of a resistor R16 respectively, the other end of the resistor R16 is connected with the positive electrode of a voltage regulator tube D4, the other end of the resistor R18 is connected with the other end of the capacitor C13, one end of an inductor L3 and one end of the capacitor C12 respectively and is grounded, the other end of the inductor L3 is connected with the other end of the resistor R17, and the other end of the capacitor C12 is connected with the other end of the capacitor C11.
When the invention is used specifically, firstly, the frequency control circuit utilizes the frequency collector U1 with the model of SJ-ADC to collect the frequency of the communication signal of a radio communication system, in order to avoid the loss caused by impedance mismatching when the communication signal is transmitted to the rear stage, the communication signal collected by the frequency collector U1 is transmitted to an impedance matching circuit consisting of an over-inductance L1, a resistor R3, a capacitor C2 and a capacitor C3 through a resistor R2 for impedance matching, and is transmitted to an amplifying circuit consisting of the resistor R4, the resistor R5, a triode Q1, a resistor R6 and the capacitor C5 through a capacitor C4 for amplifying the communication signal, and then the amplified communication signal is output to a resonant circuit consisting of a resistor R8, a capacitor C7, a capacitor C8 and an inductor L2 to select the frequency where the communication signal is located, and the communication signal is not mixed with other frequencies, the communication signal at this moment is output to an I1 pin of an analog multiplier U3 through a resistor R7 and is operated with a standard communication signal on an I2 pin of the analog multiplier to obtain two frequency signals, the analog multiplier U3, a resistor R7 and a resistor R14 form an operation circuit, the frequency sum and the frequency difference of the communication signal and the standard communication are output to a second-order active low-pass filter consisting of a resistor R12, a resistor R13, a resistor R10, a resistor R11, a capacitor C9 and a capacitor C10 from the output end of the analog multiplier U3, the second-order active low-pass filter filters the high-frequency sum, only the frequency difference between the communication signal and the standard communication signal is allowed to pass through, the frequency difference is amplified by an operational amplifier U2B, the frequency is fed back to a resonant loop consisting of the resistor R8, the capacitor C7, the capacitor C8 and an inductor L2 through the resistor R9 to reselect frequency, so as to select the frequency of the communication signal which is closest to the standard frequency signal, the amplitude of a communication signal is controlled between 0.7V and 5.7V by using a diode D1 and a voltage regulator tube D3 and a voltage regulator tube D4, when the amplitude of the communication signal is lower than 0.7V or higher than 5.7V, the voltage regulator tube D3 or the voltage regulator tube D4 is conducted, the voltage regulator tube D3 or the voltage regulator tube D4 charges a capacitor C13, a bidirectional trigger tube D2 is conducted after the capacitor C13 is fully charged, a thyristor SCR is conducted, the thyristor SCR feeds the communication signal back to a base electrode of a triode Q1 through a resistor R15 to be re-amplified so as to realize the voltage-stabilizing effect, and when the amplitude of the communication signal is between 0.7V and 5.7V, the communication signal is further resonated by the resistor R17, an inductor L3, a capacitor C11 and a capacitor C12 and is finally transmitted to a control terminal to perform data analysis on the communication signal by using the control terminal;
a communication signal is selected by a resonance circuit consisting of a resistor R8, a capacitor C7, a capacitor C8 and an inductor L2, the frequency sum between a communication signal obtained by an analog multiplier U3 and a standard communication signal is filtered by a second-order active low-pass filter consisting of a resistor R12, a resistor R13, a resistor R10, a resistor R11, a capacitor C9 and a capacitor C10, only the frequency difference between the communication signal and the standard communication signal is fed back to the resonance circuit, the error of the communication signal is reduced, the problem that the accuracy of analysis of the communication signal by a control terminal is influenced due to distortion of the communication signal received by the control terminal is solved, the communication signal is amplified by an amplifying circuit consisting of a resistor R4, a resistor R5, a triode Q1, a resistor R6 and a capacitor C5, and a stabilivolt D3, a stabilivolt D4, a bidirectional SCR trigger D2 and a thyristor are arranged to feed back the communication signal of which is not between 0.7V and 5.7V to the amplifying circuit through the resistor R15, and voltage stabilization is realized.
Claims (2)
1. A signal frequency control circuit of a radio communication system comprises a frequency collector and a control terminal, and is characterized in that a frequency control circuit and a voltage stabilization output circuit sequentially pass between the frequency collector and the control terminal, a communication signal collected by the frequency collector U1 is subjected to impedance matching and amplification, then frequency selection is carried out on the communication signal, multiplication operation is carried out on the communication signal and a standard communication signal, frequency selection is carried out again by using a frequency difference obtained by the multiplication operation, the selected communication signal is subjected to voltage stabilization by the voltage stabilization output circuit, when the amplitude of the communication signal is not in a range provided by the voltage stabilization output circuit, the communication signal is re-amplified, and the output end of the voltage stabilization output circuit is connected with the control terminal;
the frequency control circuit comprises a capacitor C1, one end of a capacitor C1 is respectively connected with one end of a resistor R1 and a VCC pin of a frequency collector U1 and is connected with a positive power supply VCC, the other end of a capacitor C1 is respectively connected with the other end of a resistor R1, one end of a resistor R2 and an out pin of a frequency collector U1, the other end of a resistor R2 is respectively connected with one end of an inductor L1, one end of a resistor R3 and one end of a capacitor C2, the other end of an inductor L1 is respectively connected with the other end of a resistor R3, one end of a capacitor C4 and one end of a capacitor C3, the other end of a capacitor C4 is respectively connected with one end of a resistor R4, one end of a resistor R5 and a base of a triode Q5, the other end of a resistor R5 is respectively connected with a collector of the triode Q5, one end of a resistor R5 and one end of a positive power supply, and the other end of a VCC pin of a frequency collector U5 and a GND pin of a capacitor C5 are respectively connected with the other end of the resistor VCC, The other end of a capacitor C3, the other end of a resistor R6, one end of a capacitor C5, one end of a capacitor C8, one end of an inductor L2, an emitter of a transistor Q1 is respectively connected with one end of a resistor R6 and one end of a capacitor C6, the other end of the resistor R6 is respectively connected with one end of a capacitor C6, the other end of the capacitor C6 is connected with the other end of a capacitor C6, the other end of the resistor R6 is connected with an I6 pin of an analog multiplier U6, an I6 pin of the analog multiplier U6 is connected with one end of the resistor R6, the other end of the resistor R6 is connected with one end of the capacitor C6 and one end of a phase amplifier U2 6, and the other end of the capacitor C6 is connected with one end of the capacitor C6, the other end of the capacitor C6 is connected with the other end of the capacitor C6, the output end of the analog multiplier U6 is connected with a standard communication signal, and the other end of the capacitor C6, One end of the resistor R11 is grounded, the other end of the resistor R11 is connected with the inverting terminal of the operational amplifier U2B and one end of the resistor R10, and the other end of the resistor R10 is connected with the output terminal of the operational amplifier U2B and the other end of the resistor R9.
2. The signal frequency control circuit of claim 1, wherein the voltage regulator output circuit comprises a thyristor SCR having a cathode connected to an anode of the diode D1, an output terminal of the analog multiplier U3 of the frequency control circuit, and one end of the resistor R13, respectively, an anode of the thyristor SCR is connected to one end of the resistor R15, another end of the resistor R15 is connected to another end of the capacitor C4 of the frequency control circuit, one end of the resistor R4, one end of the resistor R5, and a base of the transistor Q1, a cathode of the diode D1 is connected to an anode of the diode D3, a cathode of the diode D4, one end of the resistor R17, one end of the capacitor C11, and a control terminal, a control electrode of the thyristor SCR is connected to one end of the diac D2, and another end of the diac D2 is connected to a cathode of the diode D3, one end of the resistor R18, and another end of the diode D3, respectively, One end of a capacitor C13, one end of a resistor R16, the other end of a resistor R16 is connected with the anode of a voltage regulator tube D4, the other end of the resistor R18 is respectively connected with the other end of a capacitor C13, one end of an inductor L3 and one end of a capacitor C12 and is grounded, the other end of the inductor L3 is connected with the other end of a resistor R17, and the other end of the capacitor C12 is connected with the other end of a capacitor C11.
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