A beam switching device for microstrip phased antenna

Abstract

The present invention proposes a beam switching device for a microstrip phased antenna, comprising: an antenna receiving unit, a duplexer, an antenna transmitting unit, a filtering circuit, a detection circuit, an analog-to-digital conversion circuit, a transmitter, a power supply, a signal processor, a beam switching switch, a signal conditioning circuit, a power divider and a phase shifter; the antenna receiving unit is connected to the filtering circuit, the filtering circuit is connected to the detection circuit so that the detection circuit detects the signal, the detection circuit is connected to the analog-to-digital conversion circuit, the analog-to-digital conversion circuit is connected to the signal processor, the signal processor is connected to the beam switching switch, the transmitter is connected to the signal conditioning circuit through the beam switching switch, the signal conditioning circuit is connected to the power divider, the power divider is connected to the phase shifter, the phase shifter is connected to the antenna transmitting unit, and the duplexer is respectively connected to the antenna receiving unit and the antenna transmitting unit; the present invention has high beam switching efficiency and fast response speed, and can meet the user's requirements for high-quality calls.

Description

Technical Field

[0001] The present invention relates to the technical field of antenna control, and in particular to a beam switching device of a microstrip phased-control antenna. Background Art

[0002] With the rapid development of communication technology, antennas are indispensable components in the development of mobile communications. Microstrip antennas have the characteristics of small size and light weight, and are widely used in wireless communications. Microstrip beam switching antennas can generate multiple narrow waves. When the user moves, the beam switching antenna will change the narrow wave switching direction according to the state. This antenna switching device is usually used in some base station configurations. When the user moves within the coverage area of ​​the base station, the antenna system switches the beam direction to align with the user, thereby achieving user communication. However, in the prior art, the antenna system has a slow response to switching beams and low switching efficiency, and cannot achieve the best communication state, affecting the user's communication quality. Summary of the invention

[0003] The object of the present invention is to solve at least one of the technical drawbacks.

[0004] To this end, an object of the present invention is to provide a beam switching device for a microstrip phased antenna, comprising: an antenna receiving unit, a duplexer, an antenna transmitting unit, a filtering circuit, a detection circuit, an analog-to-digital conversion circuit, a transmitter, a power supply, a signal processor, a beam switching switch, a signal conditioning circuit, a power divider and a phase shifter; the antenna receiving unit is connected to the filtering circuit, the filtering circuit is connected to the detection circuit, so that the detection circuit detects the signal, the detection circuit is connected to the analog-to-digital conversion circuit, the analog-to-digital conversion circuit is connected to the signal processor, the detection circuit sends the detected signal to the signal processor through the analog-to-digital conversion circuit, the signal processor is connected to the beam switching switch, the transmitter is connected to the signal conditioning circuit through the beam switching switch, the signal conditioning circuit is connected to the power divider, the power divider is connected to the phase shifter, so that the signal conditioning circuit conditions the signal transmitted by the transmitter and transmits it to the power divider, the phase shifter is connected to the antenna transmitting unit, the duplexer is connected to the antenna receiving unit and the antenna transmitting unit respectively, so that the duplexer isolates the signal transmitted by the antenna transmitting unit from the signal received by the antenna receiving unit.

[0005] Preferably, the signal conditioning circuit includes twenty-first to thirty-second resistors, thirteenth to nineteenth capacitors, fifth to seventh diodes, and fourth to sixth operational amplifiers, one end of the twenty-first resistor is connected to one end of the twenty-second resistor and one end of the twenty-third resistor, the same-direction input end of the fourth operational amplifier is connected to the other end of the twenty-second resistor and one end of the thirteenth capacitor, the reverse input end of the fourth operational amplifier is connected to one end of the fourteenth capacitor, the output end of the fourth operational amplifier is connected to the other end of the thirteenth capacitor and one end of the twenty-fourth resistor, the same-direction input end of the fifth operational amplifier is connected to one end of the twenty-fifth resistor through the twenty-sixth resistor, and the reverse input end of the fifth operational amplifier is connected to one end of the twenty-seventh resistor. The other end of the twenty-fifth resistor is connected to ground, the other end of the twenty-eighth resistor is connected to the output end of the fifth operational amplifier and one end of the twenty-eighth resistor through the fifteenth capacitor, the other end of the twenty-eighth resistor is connected to one end of the sixteenth capacitor, one end of the seventeenth capacitor and one end of the twenty-ninth resistor, the other end of the sixteenth capacitor is connected to the output end of the sixth operational amplifier and one end of the thirty-second resistor through the thirtieth resistor, the same-direction input end of the sixth operational amplifier is connected to the other end of the twenty-ninth resistor through the eighteenth capacitor, the other end of the seventeenth capacitor is connected to the cathode of the fifth diode, the reverse input end of the sixth operational amplifier is connected to one end of the thirty-first resistor, and the other end of the thirty-second resistor is connected to the anode of the sixth diode, the cathode of the seventh diode and one end of the nineteenth capacitor.

[0006] In any of the above schemes, preferably, the detection circuit includes first to twentieth resistors, first to twelfth capacitors, first to fourth diodes, first transistors, and first to third operational amplifiers, the inverting input terminal of the first operational amplifier is connected to one end of the first resistor, the same-direction input terminal of the first operational amplifier is connected to one end of the second capacitor, the other end of the first resistor is connected to one end of the second resistor and one end of the first capacitor, the base of the first transistor is connected to the other end of the second resistor, the collector of the first transistor is connected to one end of the third capacitor, one end of the eighth resistor, the cathode of the first diode, the cathode of the second diode, one end of the twelfth resistor and one end of the thirteenth resistor, the emitter of the first transistor is connected to the other end of the first capacitor, the other end of the third capacitor and the other end of the eighth resistor, the output terminal of the first operational amplifier is connected to one end of the fourth capacitor through the fifth resistor, the other end of the fourth capacitor is connected to one end of the sixth resistor, the other end of the sixth resistor is connected to the seventh resistor and one end of the fifth capacitor, the other end of the seventh resistor is connected to one end of the ninth resistor and the other end of the eighth resistor, and the other end of the second capacitor is connected to one end of the fourth resistor through the third resistor. The first operational amplifier is connected to the first terminal of the semiconductor device, the second operational amplifier is connected to the first terminal of the semiconductor device, the first operational amplifier is connected to the first terminal of the semiconductor device, the first operational amplifier is connected to the second terminal of the semiconductor device, the first operational amplifier is connected to the first terminal of the semiconductor device, the second operational amplifier is connected to the first terminal of the semiconductor device, the first operational amplifier is connected to the second terminal of the semiconductor device, the second operational amplifier is connected to the first terminal of the semiconductor device, the first operational amplifier is connected to the first terminal of the semiconductor device, the second operational amplifier is connected to the first terminal of the semiconductor device, the first operational amplifier is connected to the second terminal of the semiconductor device, the second operational amplifier is connected to the first terminal of the semiconductor device, the first operational amplifier is connected to the first terminal of the semiconductor device, the second operational amplifier is connected to the first terminal of the semiconductor device, the first operational amplifier is connected to the first terminal of the semiconductor device, the second operational amplifier is connected to the first terminal of the semiconductor device, and the second operational amplifier is connected to the first terminal of the semiconductor device.

[0007] In any of the above schemes, preferably, the power supply includes thirty-third to forty-third resistors, twentieth to twenty-second capacitors, an eighth diode, a ninth diode, second to fourth transistors and an inductor, one end of the thirty-third resistor is connected to one end of the twentieth capacitor, one end of the forty-third resistor, one end of the thirty-fourth resistor and the collector of the second transistor, the collector of the third transistor is connected to the other end of the thirty-fourth resistor, the base of the third transistor is connected to the base of the second transistor and one end of the forty-first resistor through the thirty-fifth resistor, the emitter of the second transistor is grounded through the forty-second resistor, and the thirty-sixth resistor is connected to the The twenty-one capacitor is connected in parallel, and one end of the parallel connection is connected to the emitter of the third transistor and one end of the inductor, and the other end of the parallel connection is connected to the other end of the forty-first resistor and the cathode of the eighth diode, the other end of the inductor is connected to one end of the thirty-eighth resistor, one end of the thirty-seventh resistor and one end of the twenty-second capacitor, the collector of the fourth transistor is connected to the other end of the thirty-seventh resistor, the base of the fourth transistor is connected to the other end of the twenty-second capacitor and the cathode of the ninth diode through the fortieth resistor, the emitter of the fourth transistor is grounded, and the other end of the thirty-eighth resistor is connected to one end of the thirty-ninth resistor and the output end of the power supply.

[0008] The advantages and beneficial effects of the present invention over the prior art are as follows:

[0009] 1. A beam switching device for a microstrip phased antenna of the present invention sends a received signal to a signal processor through a detection circuit. The signal processor controls the switching of the beam according to the detected signal information, so that the user can use the best communication state of the signal, with high switching efficiency and fast response speed.

[0010] 2. A beam switching device for a microstrip phased antenna of the present invention can make the antenna signal gain higher and the loss smaller through a signal conditioning circuit after the transmitter transmits the signal, thereby achieving higher quality communication.

[0011] 3. The beam switching device of a microstrip phased antenna of the present invention has stable power supply, low power consumption, and saves more costs. By setting a duplexer, it can ensure that the transmitted and received signals do not interfere with each other, reduce more noise in the signal, so that the received signal has higher accuracy and good transmission quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0013] Figure 1 A structural block diagram of a beam switching device for a microstrip phased antenna according to the present invention;

[0014] Figure 2 A microstrip phased antenna according to the present invention Figure 1 The circuit schematic diagram of the signal conditioning circuit shown in;

[0015] Figure 3 A microstrip phased antenna according to the present invention Figure 1 The circuit schematic diagram of the detection circuit shown in;

[0016] Figure 4 A microstrip phased antenna according to the present invention Figure 1 The circuit schematic of the power supply is shown in .

[0017] The reference numerals are:

[0018] 1-antenna receiving unit; 2-duplexer; 3-antenna transmitting unit; 4-filter circuit; 5-detection circuit; 6-analog-to-digital conversion circuit; 7-transmitter; 8-power supply; 9-signal processor; 10-beam switching switch; 11-phase shifter; 12-power divider; 13-signal conditioning circuit. DETAILED DESCRIPTION

[0019] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0020] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] As shown in FIG. 1 , a beam switching device for a microstrip phased antenna according to the present invention includes: an antenna receiving unit 1, a duplexer 2, an antenna transmitting unit 3, a filter circuit 4, a detection circuit 5, an analog-to-digital conversion circuit 6, a transmitter 7, a power supply 8, a signal processor 9, a beam switching switch 10, a signal conditioning circuit 13, a power divider 12, and a phase shifter 11; the antenna receiving unit 1 is connected to the filter circuit 4, the filter circuit 4 is connected to the detection circuit 5, so that the detection circuit 5 detects the signal, the detection circuit 5 is connected to the analog-to-digital conversion circuit 6, the analog-to-digital conversion circuit 6 is connected to the signal processor 9, and the detection circuit 5 sends the detected signal to the signal processor through the analog-to-digital conversion circuit 6 9, the signal processor 9 is connected to the beam switching switch 10, the transmitter 7 is connected to the signal conditioning circuit 13 through the beam switching switch 10, the signal conditioning circuit 13 is connected to the power divider 12, the power divider 12 is connected to the phase shifter 11, so that the signal conditioning circuit 13 conditions the signal transmitted by the transmitter 7 and then transmits it to the power divider 12, the phase shifter 11 is connected to the antenna transmitting unit 3, the power divider 12 sends the signal to the phase shifter, and then the phase shifter 11 transmits the signal through the antenna transmitting unit 3, and the duplexer 2 is respectively connected to the antenna receiving unit 1 and the antenna transmitting unit 3, so that the duplexer 2 can isolate the signal transmitted by the antenna transmitting unit 3 from the signal received by the antenna receiving unit 1.

[0022] A beam switching device for a microstrip phased antenna of the present invention sends a received signal to a signal processor 9 through a detection circuit 5. The signal processor 9 controls the switching of the beam according to the detected signal information, so that the user can use the best communication state of the signal, with high switching efficiency and fast response speed.

[0023] Further, such as Figure 2As shown, the signal conditioning circuit 13 includes twenty-first to thirty-second resistors, thirteenth to nineteenth capacitors, fifth to seventh diodes, and fourth to sixth operational amplifiers. One end of the twenty-first resistor R21 is connected to one end of the twenty-second resistor R22 and one end of the twenty-third resistor R23. The same-direction input end of the fourth operational amplifier U4 is connected to the other end of the twenty-second resistor R22 and one end of the thirteenth capacitor C13. The reverse input end of the fourth operational amplifier U4 is connected to one end of the fourteenth capacitor C14. The output end of the fourth operational amplifier U4 is connected to the other end of the thirteenth capacitor C13 and one end of the twenty-fourth resistor R24. The same-direction input end of the fifth operational amplifier U5 is connected to one end of the twenty-fifth resistor R25 and the other end of the twenty-fourth resistor R24 ​​through the twenty-sixth resistor R26. The reverse input end of the fifth operational amplifier U5 is grounded through the twenty-seventh resistor R27. The other end of the twenty-fifth resistor R25 is connected to the output end of the fifth operational amplifier U5 and the connection end of the twenty-eighth resistor R28 through the fifteenth capacitor C15. The first operational amplifier U6 is connected to one end of the second operational amplifier U6, the second ...

[0024] The signal conditioning circuit 13 conditions the signal to be transmitted and then transmits it, with high signal gain and low loss, thus achieving high call quality.

[0025] Further, such as Figure 3As shown, the detection circuit 5 includes first to twentieth resistors, first to twelfth capacitors, first to fourth diodes, first transistors, first to third operational amplifiers, the inverting input terminal of the first operational amplifier U1 is connected to one end of the first resistor R1, the non-inverting input terminal of the first operational amplifier U1 is connected to one end of the second capacitor C2, the other end of the first resistor R1 is connected to one end of the second resistor R2 and one end of the first capacitor C1, the base of the first transistor Q1 is connected to the other end of the second resistor R2, the collector of the first transistor Q1 is connected to one end of the third capacitor C3, one end of the eighth resistor R8, the cathode of the first diode D1, the cathode of the second diode D2, one end of the twelfth resistor R12 and the thirteenth resistor R1 3, the emitter of the first transistor Q1 is connected to the other end of the first capacitor C1, the other end of the third capacitor C3 and the other end of the eighth resistor R8, the output end of the first operational amplifier U1 is connected to one end of the fourth capacitor C4 through the fifth resistor R5, the other end of the fourth capacitor C4 is connected to one end of the sixth resistor R6, the other end of the sixth resistor R6 is connected to the seventh resistor R7 and one end of the fifth capacitor C5, the other end of the seventh resistor R7 is connected to one end of the ninth resistor R9 and the other end of the eighth resistor R8, the other end of the second capacitor C2 is connected to one end of the fourth resistor R4 through the third resistor R3, the other end of the fourth resistor R4 is connected to the positive electrode of the third diode D3, the other end of the fifth capacitor C5 and the other end of the eighth resistor R8 The anode of the first diode D1 is connected to one end of the seventh capacitor C7 through the tenth resistor R10, the anode of the second diode D2 is connected to one end of the seventh capacitor C7 through the eleventh resistor R11, the same-direction input end of the third operational amplifier U3 is connected to the other end of the twelfth resistor R12 and one end of the fourteenth resistor R14, the reverse input end of the third operational amplifier U3 is connected to one end of the seventeenth resistor R17 through the eleventh capacitor C11, the output end of the third operational amplifier U3 is connected to the other end of the seventeenth resistor, the other end of the seventeenth resistor R17 is connected to one end of the twentieth resistor R20 and one end of the tenth capacitor C10 through the twenty-first resistor R21, and the second operational amplifier U The same-direction input terminal of the second operational amplifier U2 is connected to the other end of the fourteenth resistor R14 and the other end of the thirteenth resistor R13 through the fifteenth resistor R15, the inverting input terminal of the second operational amplifier U2 is connected to one end of the twelfth capacitor C12 and one end of the eighth capacitor C8 through the sixteenth resistor R16, the other end of the twelfth capacitor C12 is grounded through the eighteenth resistor R18, the ninth capacitor C9 is connected in parallel with the nineteenth resistor R19, one end of the parallel connection is connected to the other end of the eighth capacitor C8, and the other end of the parallel connection is connected to the output terminal of the second operational amplifier U2 and one end of the twentieth resistor R20, and the cathode D3 of the third diode, the other end of the sixth capacitor C6, the cathode D4 of the fourth diode D4 and the other end of the seventh capacitor C7 are grounded.

[0026] The detection circuit 5 sends the detected signal to the signal processor 9. After receiving the detection signal, the signal processor 9 performs beam switching, thereby optimizing the signal communication state of the mobile communication and improving the call quality.

[0027] Further, such as Figure 4 As shown, the power supply 8 includes thirty-third to forty-third resistors, twentieth to twenty-second capacitors, an eighth diode D8, a ninth diode D9, second to fourth transistors and an inductor L, one end of the thirty-third resistor R33 is connected to one end of the twentieth capacitor C20, one end of the forty-third resistor R43, one end of the thirty-fourth resistor R34 and the collector of the second transistor Q2, the collector of the third transistor Q3 is connected to the other end of the thirty-fourth resistor R34, the base of the third transistor Q3 is connected to the base of the second transistor Q2 and one end of the forty-first resistor R41 through the thirty-fifth resistor R35, the emitter of the second transistor Q2 is grounded through the forty-second resistor R42, the thirty-sixth resistor R36 is connected in parallel with the twenty-first capacitor C21, one end of the parallel connection is connected to the emitter of the third transistor Q3 and one end of the inductor L, and The other end of the connection is connected to the other end of the forty-first resistor R41 and the cathode of the eighth diode D8, the other end of the inductor L is connected to one end of the thirty-eighth resistor R38, one end of the thirty-seventh resistor R37 and one end of the twenty-second capacitor C22, the collector of the fourth triode Q4 is connected to the other end of the thirty-seventh resistor R37, the base of the fourth triode Q4 is connected to the other end of the twenty-second capacitor C22 and the cathode of the ninth diode D9 through the fortieth resistor R40, the emitter of the fourth triode Q4 is grounded, the other end of the thirty-eighth resistor R38 is connected to one end of the thirty-ninth resistor R39 and the output end of the power supply 8; the power supply 8 provides a stable and reliable power supply method, which can prevent the sudden change of current and voltage from causing damage to the signal processor 9, and can ensure the safety and stability of the circuit, with low power loss, saving more energy costs.

[0028] Optionally, the signal processor 9 uses a chip of the TMS320F28335PGFA model.

[0029] The working process of the embodiment of the present invention is as follows: the antenna receiving unit 1 receives a signal, the signal is filtered through the filtering circuit 4, the filtered signal passes through the detection circuit 5, the detection circuit 5 sends the detected signal to the signal processor 9 through the analog-to-digital conversion circuit 6, the signal processor 9 controls the beam switching switch 10 to switch the beam according to the signal condition detected by the detection circuit, the signal emitted by the emitter is conditioned by the signal conditioning circuit 13, the conditioned signal passes through the power divider 12 to the phase shifter 11, and the phase shifter 11 then passes through the antenna transmitting unit 3 to transmit the signal.

[0030] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0031] Although the embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and cannot be understood as limiting the present invention. Those skilled in the art may change, modify, replace and modify the above embodiments within the scope of the present invention without departing from the principles and purpose of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A beam switching device for a microstrip phased antenna, characterized in that: include: Antenna receiving unit, duplexer, antenna transmitting unit, filtering circuit, detection circuit, analog-to-digital conversion circuit, transmitter, power supply, signal processor, beam switching switch, signal conditioning circuit, power divider and phase shifter; the antenna receiving unit is connected to the filtering circuit, the filtering circuit is connected to the detection circuit, so that the detection circuit detects the signal, the detection circuit is connected to the analog-to-digital conversion circuit, the analog-to-digital conversion circuit is connected to the signal processor, the detection circuit sends the detected signal to the signal processor through the analog-to-digital conversion circuit, the signal processor is connected to the beam switching switch, the transmitter is connected to the signal conditioning circuit through the beam switching switch, the signal conditioning circuit is connected to the power divider, the power divider is connected to the phase shifter, so that the signal conditioning circuit conditions the signal transmitted by the transmitter and transmits it to the power divider, the phase shifter is connected to the antenna transmitting unit, the duplexer is respectively connected to the antenna receiving unit and the antenna transmitting unit, so that the duplexer isolates the signal transmitted by the antenna transmitting unit from the signal received by the antenna receiving unit; The signal conditioning circuit includes twenty-first to thirty-second resistors, thirteenth to nineteenth capacitors, fifth to seventh diodes, and fourth to sixth operational amplifiers. One end of the twenty-first resistor is connected to one end of the twenty-second resistor and one end of the twenty-third resistor. The same-direction input end of the fourth operational amplifier is connected to the other end of the twenty-second resistor and one end of the thirteenth capacitor. The reverse input end of the fourth operational amplifier is connected to one end of the fourteenth capacitor. The output end of the fourth operational amplifier is connected to the other end of the thirteenth capacitor and one end of the twenty-fourth resistor. The same-direction input end of the fifth operational amplifier is connected to one end of the twenty-fifth resistor and the other end of the twenty-fourth resistor through the twenty-sixth resistor. The reverse input end of the fifth operational amplifier is grounded through the twenty-seventh resistor. The other end of the fifth resistor is connected to the output end of the fifth operational amplifier and one end of the twenty-eighth resistor through the fifteenth capacitor, the other end of the twenty-eighth resistor is connected to one end of the sixteenth capacitor, one end of the seventeenth capacitor and one end of the twenty-ninth resistor, the other end of the sixteenth capacitor is connected to the output end of the sixth operational amplifier and one end of the thirty-second resistor through the thirtieth resistor, the non-inverting input end of the sixth operational amplifier is connected to the other end of the twenty-ninth resistor through the eighteenth capacitor, the other end of the seventeenth capacitor is connected to the cathode of the fifth diode, the inverting input end of the sixth operational amplifier is connected to one end of the thirty-first resistor, and the other end of the thirty-second resistor is connected to the anode of the sixth diode, the cathode of the seventh diode and one end of the nineteenth capacitor; The detection circuit includes first to twentieth resistors, first to twelfth capacitors, first to fourth diodes, first transistors, and first to third operational amplifiers. The inverting input terminal of the first operational amplifier is connected to one end of the first resistor, the non-inverting input terminal of the first operational amplifier is connected to one end of the second capacitor, the other end of the first resistor is connected to one end of the second resistor and one end of the first capacitor, the base of the first transistor is connected to the other end of the second resistor, and the collector of the first transistor is connected to one end of the third capacitor, one end of the eighth resistor, the cathode of the first diode, the cathode of the second diode, one end of the twelfth resistor, and the thirteenth resistor. The emitter of the first transistor is connected to the other end of the first capacitor, the other end of the third capacitor and the other end of the eighth resistor, the output end of the first operational amplifier is connected to one end of the fourth capacitor through the fifth resistor, the other end of the fourth capacitor is connected to one end of the sixth resistor, the other end of the sixth resistor is connected to the seventh resistor and one end of the fifth capacitor, the other end of the seventh resistor is connected to one end of the ninth resistor and the other end of the eighth resistor, the other end of the second capacitor is connected to one end of the fourth resistor through the third resistor, the other end of the fourth resistor is connected to the anode of the third diode, the cathode of the fifth capacitor The other end is connected to one end of the sixth capacitor, the anode of the first diode is connected to one end of the seventh capacitor through the tenth resistor, the anode of the second diode is connected to one end of the seventh capacitor through the eleventh resistor, the same-direction input end of the third operational amplifier is connected to the other end of the twelfth resistor and one end of the fourteenth resistor, the reverse input end of the third operational amplifier is connected to one end of the seventeenth resistor through the eleventh capacitor, the output end of the third operational amplifier is connected to the other end of the seventeenth resistor, the other end of the seventeenth resistor is connected to one end of the twentieth resistor and one end of the tenth capacitor through the twenty-first resistor, and the second operational amplifier is connected to the other end of the twelfth resistor and one end of the tenth capacitor. The non-inverting input terminal of the amplifier is connected to the other end of the fourteenth resistor and the other end of the thirteenth resistor through the fifteenth resistor, the inverting input terminal of the second operational amplifier is connected to one end of the twelfth capacitor and one end of the eighth capacitor through the sixteenth resistor, the other end of the twelfth capacitor is grounded through the eighth resistor, the ninth capacitor is connected in parallel with the nineteenth resistor, one end of the parallel connection is connected to the other end of the eighth capacitor, and the other end of the parallel connection is connected to the output terminal of the second operational amplifier and one end of the twentieth resistor, and the cathode of the third diode, the other end of the sixth capacitor, the cathode of the fourth diode and the other end of the seventh capacitor C7 are grounded; The power supply includes thirty-third to forty-third resistors, twentieth to twenty-second capacitors, an eighth diode, a ninth diode, second to fourth transistors and an inductor, one end of the thirty-third resistor is connected to one end of the twentieth capacitor, one end of the forty-third resistor, one end of the thirty-fourth resistor and the collector of the second transistor, the collector of the third transistor is connected to the other end of the thirty-fourth resistor, the base of the third transistor is connected to the base of the second transistor and one end of the forty-first resistor through the thirty-fifth resistor, the emitter of the second transistor is grounded through the forty-second resistor, the thirty-sixth resistor is connected in parallel with the twenty-first capacitor, and one end of the parallel connection is connected to the The emitter of the third transistor is connected to one end of the inductor, and the other end in parallel is connected to the other end of the forty-first resistor and the cathode of the eighth diode. The other end of the inductor is connected to one end of the thirty-eighth resistor, one end of the thirty-seventh resistor and one end of the twenty-second capacitor. The collector of the fourth transistor is connected to the other end of the thirty-seventh resistor, the base of the fourth transistor is connected to the other end of the twenty-second capacitor and the cathode of the ninth diode through the fortieth resistor, the emitter of the fourth transistor is grounded, and the other end of the thirty-eighth resistor is connected to one end of the thirty-ninth resistor and the output end of the power supply.

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