High-precision short-wave radio station power and standing wave detection circuit

Abstract

The utility model relates to the technical field of power electronics, in particular to a high-precision short-wave radio station power and standing wave detection circuit, which comprises a directional coupling circuit, a detection circuit and an operation processing circuit, one end of a primary coil of the transformer T1 is connected with a post-stage load input end, the other end of the primary coil of the transformer T1 is connected with a radio frequency input signal and a primary coil of the transformer T2, one end of a secondary coil of the transformer T1 is connected with a resistor R5 and an anode of a diode V3, and the other end of the secondary coil of the transformer T1 is connected with one end of a secondary coil of the transformer T2, one end of a resistor R1 and a detection circuit; the other end of the secondary coil of the transformer T2 is connected with the detection circuit and the resistor R2, the resistor R2 is connected with the positive electrode of the capacitor C2, and the detection circuit is connected with the operation processing circuit, the resistor R5 and the diode V3 are used for providing bias voltage for the detection circuit at the rear end, and therefore accurate detection can be achieved when the amplitude of a power sampling signal is small.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of power electronics, especially to a high-precision short-wave radio power and standing wave detection circuit. BACKGROUND

[0002] The antenna or terminal load characteristics change of short-wave equipment can cause radio frequency line impedance mismatch, causing equipment standing wave abnormal phenomenon. Standing wave is too large on the one hand can influence the transmitting efficiency of equipment, on the other hand can cause reflected power to be too large, causes the damage of equipment internal electronic circuit, therefore, in the transmitting process of short-wave equipment, the size of output power needs to be controlled, and the standing wave state of equipment is detected, and the power and standing wave detection circuit is generally composed of directional coupling circuit, detection circuit and operation processing circuit, however, the directional coupling circuit and detection circuit of traditional detection circuit do not set appropriate static operating voltage for the amplitude characteristics of small signal, and the sensitivity of small signal detection is low, is influenced by frequency mutual inductance, environmental temperature and other factors, and the consistency of coupled sampling voltage is poor, thereby causing the power and standing wave detection error to be large. SUMMARY

[0003] In view of the defects of the prior art, the utility model provides a high-precision short-wave radio power and standing wave detection circuit, and the detection circuit can complete high-precision detection processing when the radio frequency signal is small, so that the sensitivity and accuracy of small signal processing of the directional coupling circuit are ensured.

[0004] To achieve the above object, the utility model takes the following technical scheme:

[0005] The utility model provides a high-precision short-wave radio power and standing wave detection circuit, including directional coupling circuit, detection circuit and operation processing circuit, the directional coupling circuit includes transformer T1 and transformer T2, the primary coil one end of transformer T1 is connected with the input end of rear stage load, is connected with radio frequency input signal and the one end of transformer T2 primary coil in another, the secondary coil one end of transformer T1 is connected with the one end of resistance R5 and the anode of diode V3, the cathode of diode V3 is grounded, the other end of resistance R5 is connected with power VCC, the other end of transformer T1 secondary coil is connected with the one end of transformer T2 secondary coil, the one end of resistance R1 and the input end of detection circuit, the other end of transformer T2 primary coil is grounded, the other end of resistance R1 is connected with the positive pole of capacitor C1, and the negative pole of capacitor C1 is grounded, the other end of transformer T2 secondary coil is connected with the input end of detection circuit, the one end of resistance R2, the positive pole of capacitor C2 is connected with the other end of resistance R2, and the negative pole of capacitor C2 is grounded, and the output end of detection circuit is connected with operation processing circuit, wherein transformer T1 and transformer T2 parameters are same, and resistance R1 and resistance R2 parameters are same, and capacitor C1 and capacitor C2 parameters are same.

[0006] Specifically, the detection circuit comprises a forward detection circuit and a reverse detection circuit, an input end of the forward detection circuit is connected with a secondary coil of the transformer T1, an input end of the reverse detection circuit is connected with a secondary coil of the transformer T2, and output ends of the forward detection circuit and the reverse detection circuit are connected with the operation processing circuit.

[0007] Specifically, the forward detection circuit comprises a diode V1, an anode of the diode V1 is connected with the secondary coil of the transformer T1, a cathode of the diode V1 is connected with a positive pole of a capacitor C3, one end of a resistor R3 and an input end of the operation processing circuit, and a negative pole of the C3 and the other end of the resistor R3 are grounded; the reverse detection circuit comprises a diode V2, an anode of the diode V2 is connected with the secondary coil of the transformer T2, a cathode of the diode V2 is connected with a positive pole of a capacitor C4, one end of a resistor R4 and an input end of the operation processing circuit, and a negative pole of the C4 and the other end of the resistor R4 are grounded.

[0008] Specifically, the diode V3 has the same parameters as the diode V1 and the diode V2.

[0009] Specifically, the operation processing circuit comprises a first A / D chip and a second A / D chip, an input end of the first A / D chip and an input end of the second A / D chip are connected with output ends of the detection circuit respectively, and output ends of the first A / D chip and the second A / D chip are connected with input ends of a processor respectively.

[0010] Specifically, the operation processing circuit comprises an operation processor, and the operation processor is a 32-bit microcontroller with a model number of GED32F103L-144.

[0011] Compared with the prior art, the detection circuit has the following beneficial effects:

[0012] The detection circuit has the following beneficial effects: on one hand, the resistance R5 and the diode V3 are arranged in the directional coupling circuit according to the signal amplitude characteristics, so that a reasonable static working voltage is provided for the rear-end detection circuit, and the sensitivity of the directional coupling circuit for small signal processing is improved; on the other hand, the parameters of the diode V3, the diode V1 and the diode V2 in the detection circuit and the detection load are controlled, so that the signal gain of the forward detection channel and the reverse detection channel is kept consistent, the segmented reference parameter setting and the temperature compensation processing are combined, the small-amplitude signal detection sensitivity is improved, the consistency of the forward sampling and the reverse sampling is maximized, and the detection accuracy of the forward power, the reverse power and the standing wave ratio is further improved. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 Fig. 1 is a structural schematic diagram of the detection circuit of the utility model;

[0014] Figure 2A flow chart for the power and standing wave detection method;

[0015] Figure 3 A schematic diagram for real-time power calculation; DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application. EMBODIMENT

[0017] REFERENCE Figure 1 The embodiment provides a high-precision short-wave radio power and standing wave detection circuit, which comprises a directional coupling circuit, a detection circuit and an operation processing circuit. The directional coupling circuit comprises a transformer T1 and a transformer T2. One end of a primary coil of the transformer T1 is connected with an input end of a rear-stage load, and the other end is connected with a radio frequency input signal and one end of a primary coil of the transformer T2. One end of a secondary coil of the transformer T1 is connected with one end of a resistor R5 and an anode of a diode V3, the cathode of the diode V3 is grounded, the other end of the resistor R5 is connected with a power supply VCC, the other end of the secondary coil of the transformer T1 is connected with one end of a secondary coil of the transformer T2, one end of a resistor R1 and an input end of the detection circuit, the other end of the primary coil of the transformer T2 is grounded, the other end of the resistor R1 is connected with a positive electrode of a capacitor C1, a negative electrode of the capacitor C1 is grounded, the other end of the secondary coil of the transformer T2 is connected with the input end of the detection circuit and one end of a resistor R2, the other end of the resistor R2 is connected with a positive electrode of a capacitor C2, a negative electrode of the capacitor C2 is grounded, and an output end of the detection circuit is connected with the operation processing circuit. The transformer T1 and the transformer T2 have the same parameters, the resistor R1 and the resistor R2 have the same parameters, and the capacitor C1 and the capacitor C2 have the same parameters.

[0018] In the embodiment, directional coupling sampling is mainly realized by the transformers T1 and T2, the resistors R1 and R2 and the capacitors C1 and C2. The transformer T1 realizes current sampling, the transformer T2 realizes voltage sampling, the resistor R5 and the diode V3 provide a bias voltage for a rear-end detection circuit, so that the forward power sampling signal and the reverse power sampling signal can be accurately detected even when the amplitudes are small. The resistors R1 and R2 are line matching loads, and the capacitors C1 and C2 are compensation devices. The transformers T1 and T2 have the same parameters, the resistors R1 and R2 have the same parameters, and the capacitors C1 and C2 have the same parameters, so that the consistency of key parameters such as gain of the forward sampling circuit and the reverse sampling circuit can be ensured.

[0019] Further, the detection circuit includes a forward detection circuit and a reverse detection circuit, the operation processing circuit includes a first A / D chip and a second A / D chip, the forward detection circuit includes a diode V1, an anode of the diode V1 is connected with a secondary coil of a transformer T1, a cathode of the diode V1 is connected with a positive pole of a capacitor C3, one end of a resistor R3 and an input end of the first A / D chip, a negative pole of the C3 and the other end of the resistor R3 are grounded; the reverse detection circuit includes a diode V2, an anode of the diode V2 is connected with a secondary coil of a transformer T2, a cathode of the diode V2 is connected with a positive pole of a capacitor C4, one end of a resistor R4 and an input end of the second A / D chip, a negative pole of the C4 and the other end of the resistor R4 are grounded; output ends of the first A / D chip and the second A / D chip are respectively connected with input ends of a processor, in the embodiment, the processor is a 32-bit microcontroller produced by Beijing Galileo Electronics, and the model is GED32F103L-144, the diode V3 has the same parameters as the diode V1 and the diode V2.

[0020] In the embodiment, the diode V3 has the same parameters as the diode V1 and the diode V2, the static working state of the detection circuit is ensured to be an open state, the peak envelope detection is performed by using the unidirectional conductivity of the diode and the charging and discharging process of the detection load RC, in the positive half cycle of the high-frequency signal, the diode is turned on, and the capacitor is charged, because the internal resistance of the diode is very small, so the voltage on the capacitor approaches the maximum value of the high-frequency voltage in a very short time, when the high-frequency voltage decreases from the maximum value to the voltage on the capacitor, the diode is cut off, and the capacitor is discharged through the load capacitor, because the discharge constant RC is much larger than the period of the high-frequency voltage, when the voltage on the capacitor slightly decreases, the diode is turned on again in the second positive half cycle of the high-frequency, so the process is repeated continuously, and thus the peak envelope detection is realized.

[0021] The operation processing circuit calculates the real-time forward power, the reverse power and the standing wave ratio according to the forward power sampling voltage and the reverse power sampling voltage.

[0022] Reference Figure 2 In the embodiment, the detection method of the high-precision short-wave radio station standing wave and power includes the following steps:

[0023] S1, divide the short-wave frequency (2MHz-30MHz) into N frequency bands averagely; wherein N≥10, the larger N is, the smaller the span of each frequency band is, the more accurate the final detection result is, and the calculation amount also increases accordingly, the value of N can be determined according to actual requirements, in the embodiment, N is 28, and reference Figure 3The short wave frequency (2MHz-30MHz) is averagely divided into 28 frequency bands, and the frequencies in the 1st frequency band to the 28th frequency band are f1, f2, f3,..., f28 in sequence, wherein 2MHz≤f1<3MHz, 3MHz≤f2<4MHz, 4MHz≤f3<5MHz,..., 29MHz≤f28<30MHz.

[0024] S2, acquiring the reference power and the reference power level of the transmitting signal in each frequency band of the device under different temperature intervals; the temperature intervals include a high temperature interval, a room temperature interval and a low temperature interval, wherein the temperature t1 of the low temperature interval satisfies -45℃≤t1<-10℃, the temperature t2 of the room temperature interval satisfies -10℃≤t2<35℃, and the temperature t3 of the high temperature interval satisfies 35℃≤t3<70℃; the reference power and the reference power level in each frequency band are respectively the reference power and the reference power level corresponding to the intermediate frequency in the frequency band, for example, the reference power and the reference power level of the first frequency band in the high temperature interval are the reference power and the reference power voltage of the device when the frequency of the transmitting signal is 2.5MHz and 35℃≤environmental temperature<70℃.

[0025] S3, acquiring the forward power sampling voltage and the reverse power sampling voltage.

[0026] S4, calculating the standing wave ratio SWR according to the forward power sampling U1 and the reverse power voltage U2, and the calculation method of the standing wave ratio SWR is: .

[0027] S5, determining the reference power and the reference power level corresponding to the transmitting signal according to the frequency of the transmitting signal of the device and the environmental temperature, and then calculating the real-time power Pi of the device, for example, when the frequency of the transmitting signal of the device is 5.5MHz and the environmental temperature is 10℃, the reference power and the reference power level corresponding to the transmitting signal are the reference power and the reference power voltage of the fourth frequency band in the room temperature interval, and the real-time power Pi is calculated through the following formula:

[0028] In the formula, Ui is the real-time power sampling voltage, is the reference power corresponding to the transmitting signal, is the reference power level corresponding to the transmitting signal, if Ui is the forward power sampling voltage, then Pi is the forward real-time power, and if Ui is the reverse power sampling voltage, then Pi is the reverse real-time power.

[0029] The specific embodiments of the utility model enable the person skilled in the art to understand or realize the utility model. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments without departing from the spirit or scope of the utility model.

[0030] It is to be understood that the present application is not limited to the particular examples described and that various modifications and alterations can be made without departing from the scope of the present application. The scope of the present application is limited only by the claims appended hereto.

Claims

1. A high-precision short-wave radio station power and standing wave detection circuit, characterized in that, The directional coupling circuit, the detection circuit and the operation processing circuit are included, the directional coupling circuit includes transformer T1 and transformer T2, one end of the primary coil of transformer T1 is connected with the input end of the rear stage load, the other end is connected with the radio frequency input signal and one end of the primary coil of transformer T2, one end of the secondary coil of transformer T1 is connected with one end of resistance R5 and the anode of diode V3, the cathode of diode V3 is grounded, the other end of resistance R5 is connected with power supply VCC, the other end of the secondary coil of transformer T1 is connected with one end of the secondary coil of transformer T2, one end of resistance R1 and the input end of the detection circuit, the other end of the primary coil of transformer T2 is grounded, the other end of resistance R1 is connected with the positive pole of capacitor C1, the negative pole of capacitor C1 is grounded, the other end of the secondary coil of transformer T2 is connected with the input end of the detection circuit and one end of resistance R2, the other end of resistance R2 is connected with the positive pole of capacitor C2, the negative pole of capacitor C2 is grounded, the output end of the detection circuit is connected with the operation processing circuit, wherein the parameters of transformer T1 and transformer T2 are the same, the parameters of resistance R1 and resistance R2 are the same, and the parameters of capacitor C1 and capacitor C2 are the same.

2. The high-precision short-wave radio station power and standing wave detection circuit according to claim 1, characterized in that, The detection circuit includes a forward detection circuit and a reverse detection circuit, the input end of the forward detection circuit is connected with the secondary coil of transformer T1, the input end of the reverse detection circuit is connected with the secondary coil of transformer T2, the output ends of the forward detection circuit and the reverse detection circuit are connected with the operation processing circuit.

3. The high-precision short-wave radio station power and standing wave detection circuit according to claim 2, characterized in that, The forward detection circuit includes diode V1, the anode of diode V1 is connected with the secondary coil of transformer T1, the cathode of diode V1 is connected with the positive pole of capacitor C3, one end of resistance R3 and the input end of the operation processing circuit, the negative pole of C3 and the other end of resistance R3 are grounded; the reverse detection circuit includes diode V2, the anode of diode V2 is connected with the secondary coil of transformer T2, the cathode of diode V2 is connected with the positive pole of capacitor C4, one end of resistance R4 and the input end of the operation processing circuit, the negative pole of C4 and the other end of resistance R4 are grounded.

4. The high-precision short-wave radio station power and standing wave detection circuit according to claim 3, characterized in that, Diode V3 has the same parameters as diode V1 and diode V2.

5. The high-precision short-wave radio station power and standing wave detection circuit according to claim 1, characterized in that, The operation processing circuit includes first A / D chip and second A / D chip, the input end of the first A / D chip and the input end of the second A / D chip are respectively connected with the output end of the detection circuit, the output end of the first A / D chip and the output end of the second A / D chip are respectively connected with the input end of the processor.

6. The high-precision short-wave radio station power and standing wave detection circuit according to claim 1, characterized in that, The operation processing circuit includes an operation processor, the operation processor is a 32-bit microcontroller, and the model is GED32F103L-144.

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