Multi-channel radio frequency assembly power supply fault detection circuit

Abstract

The invention discloses a multi-channel radio frequency assembly power supply fault detection circuit, and belongs to the technical field of electronic information. The circuit comprises a voltage weighted summation circuit module, the voltage weighted summation circuit module is used for endowing power supply voltages of a plurality of radio frequency components with different weights and carrying out weighted summation, each radio frequency component corresponds to an input resistor, and different values of the input resistors are used for endowing the radio frequency components with different weight values; and the anti-phase acquisition circuit module is used for inverting the weighted summation result of the voltage weighted summation circuit module and outputting a code through an analog-to-digital converter to judge whether the power supply voltage of the channel where each radio frequency component is located is normal or not. According to the invention, the complexity of the circuit is greatly reduced, the use number of digital processor interfaces is reduced, and the cost is effectively reduced.

Description

Technical Field

[0001] The invention belongs to the field of electronic information technology, and in particular relates to a multi-channel radio frequency component power supply fault detection circuit. Background Art

[0002] Usually, there are multiple RF components in the radar system, such as receivers, transmitters, frequency sources, and TR components, etc. The power supply provides power supply voltage to each RF component through the power supply and distribution circuit, such as Figure 1 The power supply fault detection circuit is used to detect in real time whether the power supply voltage of each RF component is abnormal. If an abnormality occurs, it can provide a signal to the digital processor, which controls the power supply and distribution circuit to generate protection or switch the power supply line, etc., to eliminate the fault in time and restore the RF component to normal operation, greatly improving the stability and reliability of the radar system.

[0003] Currently, if Figure 2 As shown, the method for detecting power supply failure of RF components is mainly to lead out the power supply voltage of each RF component (i.e., the power supply voltage of the first RF component in the figure ... the power supply voltage of the Nth RF component) and divide it, and then collect, quantize, and encode it by the analog-to-digital converter and send it to the digital processor for analysis. The disadvantage is that multiple analog-to-digital converters are required, the circuit is complex, there are many supporting components, and a large number of interfaces of the digital processor are occupied, which is costly. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a multi-channel RF component power supply fault detection circuit. By improving the circuit design and introducing an inverting adder circuit based on an operational amplifier, the power supply voltages of multiple RF components are weighted summed and analyzed. Only one analog-to-digital converter is required to realize fault detection of the power supply voltages of multiple RF components, which greatly reduces the complexity of the circuit, reduces the number of digital processor interfaces used, and effectively reduces the cost.

[0005] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0006] A multi-channel radio frequency component power supply fault detection circuit, comprising:

[0007] A voltage weighted summation circuit module, used to assign different weights to the supply voltages of multiple RF components and perform weighted summation, wherein each RF component corresponds to an input resistor, and different values ​​of the input resistor are used to assign different weight values ​​to the RF components;

[0008] The inverting acquisition circuit module is used to invert the weighted summation result of the voltage weighted summation circuit module and output the code through the analog-to-digital converter to determine whether the power supply voltage of the channel where each RF component is located is normal.

[0009] The beneficial effects of the present invention are:

[0010] The present invention requires fewer analog-to-digital converters and supporting components, has a simple circuit, low cost, and is easy to produce; only one analog-to-digital converter is needed to realize fault detection of the power supply voltages of multiple RF components, reducing the number of digital processor interfaces occupied; the power supply voltage weights of different RF components vary greatly, the analysis algorithm is simple and reliable, the power supply fault detection is highly accurate, and it is not easy to misjudge or miss. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A schematic diagram of power supply for radio frequency components in the prior art;

[0012] Figure 2 It is a schematic diagram of a power supply fault detection circuit in the prior art;

[0013] Figure 3 This is a schematic diagram of a voltage weighted summation circuit module of the present invention;

[0014] Figure 4 This is a schematic diagram of the inverting acquisition circuit module of the present invention. DETAILED DESCRIPTION

[0015] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0016] The present invention provides a multi-channel RF component power supply fault detection circuit. The core idea is to design the ratio of the resistance values ​​in the circuit to give 1 / 2, 1 / 4, ..., 1 / 2 to the power supply voltage of each RF component. N The weights are then weighted and summed, and the voltage after weighted summation is converted into analog-to-digital. Under such weight setting, the power supply voltage of each RF component corresponds to the bit value of each bit in the quantization code after analog-to-digital conversion. By analyzing the quantization code, it can be determined whether the power supply voltage of each RF component is normal. Specifically, the multi-channel RF component power supply fault detection circuit can be divided into two parts in terms of composition, namely, the voltage weighted summation circuit module and the inverting acquisition circuit module.

[0017] The function of the voltage weighted summation circuit module is to perform weighted summation of the supply voltages of multiple RF components. The circuit schematic is shown in the figure. Figure 3 The input signal is the first RF component supply voltage u 1 , the second RF component supply voltage u 2 Until the Nth RF component supply voltage u N , the output signal is the first output voltage u o1 The circuit composition includes a first resistor R 1 , the second resistor R 2 Until the Nth resistor R N , the first feedback resistor Rf1 and the first operational amplifier U 1 The first RF component supply voltage u 1 , the second RF component supply voltage u 2 Until the Nth RF component supply voltage u N Input the first resistor R 1 , the second resistor R 2 Until the Nth resistor R N , the first resistor R 1 , the second resistor R 2 Until the Nth resistor R N are connected in parallel to the first operational amplifier U 1 The inverting terminal of the first feedback resistor R f1 Connected across the first operational amplifier U 1 The inverting terminal and the output terminal, the first output voltage u o1 Through the first operational amplifier U 1 The output terminal of the first operational amplifier U 1 The in-phase end of is grounded. The values ​​of multiple input resistors in the voltage weighted summation circuit module satisfy the following relationship:

[0018] ,

[0019] In the formula, R 1 , R 2 …,R N Corresponding to the values ​​of the first, second, ..., Nth resistors respectively, The principle of this setting is that each bit of the analog-to-digital converter output code corresponds to 1 / 2, 1 / 4, ..., 1 / times the reference voltage, by setting corresponding weights for the supply voltages of different RF components in the weighted summation circuit, the second output voltage u o2 After analog-to-digital conversion, it directly corresponds to each bit in the code; the role of the feedback resistor is to determine the first operational amplifier U together with the first resistor to the Nth resistor 1 gain.

[0020] Based on this, the first output voltage of the weighted summation circuit is:

[0021] ,

[0022] Since the RF power supply voltage u of each RF component is consistent, combined with the above resistance ratio, we can get:

[0023] u o1 =-(1 / 2+1 / 4+…+1 / 2 N )u,

[0024] In the formula, u represents the power supply voltage of the RF component; thereby, the weighted summation function of the power supply voltages of multiple RF components is realized.

[0025] The function of the inverting acquisition circuit module is to convert the first output voltage u generated by the voltage weighted summation circuit module into o1 Inverted and sent to the analog-to-digital converter for collection and processing. The circuit schematic is shown in Figure 4 Specifically, the input signal of the inverting acquisition circuit module is the first output voltage u of the voltage weighted summation circuit module. o1 The output signal is N-bit coded. The circuit composition includes a feedforward resistor R g2 , the second feedback resistor R f2 , the second operational amplifier U 2 and analog-to-digital converter. The first output voltage u o1 Input to feedforward resistor R g2 , feedforward resistor R g2 Connect the second operational amplifier U 2 The inverting terminal of the second feedback resistor R f2 Connected across the second operational amplifier U 2 The inverting terminal and output terminal of the second operational amplifier U 2 The output terminal outputs a second output voltage u o2 , connected to the input of the analog-to-digital converter, the second operational amplifier U 2 The non-inverting end of the feedforward resistor R g2 and the second feedback resistor R f2 The following relationship is satisfied in terms of value:

[0026] ,

[0027] Since the second output voltage , take R f2 =R g2 Can make u o2 =-u o1 , that is, the inverse phase is equal, so that the analog-to-digital conversion is full-scale conversion, and the quantization accuracy of the analog-to-digital converter is maximized.

[0028] By reading the quantized code value of the analog-to-digital converter, it can be determined whether all the detected channels are working normally. o2 Through weighted summation and inversion acquisition of two modules, the second output voltage u of the analog-to-digital converter is input o2 =(1 / 2+1 / 4+…+1 / 2 N)u, where u is the supply voltage of the RF component. After sampling and quantization by the analog-to-digital converter, the voltage of each RF component corresponds to each bit in the quantization code. If all bits of the code value are "1", the supply voltage of all detected channels is normal. If a bit of the code value is "0", the channel corresponding to the bit has no supply voltage.

[0029] The number of channels that can be detected by this multi-channel RF component power supply fault detection circuit is limited by the quantization bit number of the analog-to-digital converter, that is, the resolution. The maximum number of channels that can be detected cannot exceed the quantization bit number of the analog-to-digital converter. When using it, it should be noted that the power supply voltage of each channel to be detected must be consistent and must be consistent with the reference voltage of the analog-to-digital converter. If there are multiple power supply voltages in the system, they can be grouped by voltage and detected separately using this power supply fault detection circuit.

[0030] The specific embodiments described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multi-channel RF component power supply fault detection circuit, characterized in that: include: A voltage weighted summation circuit module, used to assign different weights to the supply voltages of multiple RF components and perform weighted summation, wherein each RF component corresponds to an input resistor, and different values ​​of the input resistor are used to assign different weight values ​​to the RF components; The inverting acquisition circuit module is used to invert the weighted summation result of the voltage weighted summation circuit module and output the code through the analog-to-digital converter to determine whether the power supply voltage of the channel where each RF component is located is normal.

2. A multi-channel RF component power supply fault detection circuit according to claim 1, characterized in that: The voltage weighted summation circuit module includes a first feedback resistor, a first operational amplifier, and a plurality of input resistors, wherein the plurality of input resistors are connected in parallel to the inverting terminal of the first operational amplifier, and the first feedback resistor is connected across the inverting terminal and the output terminal of the first operational amplifier; wherein the plurality of input resistors satisfy the following relationship in terms of value: ， In the formula, R1, R2, R N Corresponding to the values ​​of the first, second, ..., Nth resistors respectively, The value of the corresponding first feedback resistor; The first RF component power supply voltage, the second RF component power supply voltage, and even the Nth RF component power supply voltage are respectively input into the first resistor, the second resistor, and even the Nth resistor.

3. A multi-channel RF component power supply fault detection circuit according to claim 2, characterized in that: The first output voltage is outputted via the output terminal of the first operational amplifier, and the non-inverting terminal of the first operational amplifier is grounded, wherein the first output voltage is: ， In the formula, u1, u2, ..., u N Corresponding to the first, second, ..., Nth RF component supply voltages respectively.

4. A multi-channel RF component power supply fault detection circuit according to claim 3, characterized in that: The first RF component supply voltage, the second RF component supply voltage, and the Nth RF component supply voltage are all the same, which is u. Then u o1 =-(1 / 2+1 / 4+…+1 / 2 N )u.

5. The multi-channel RF component power supply fault detection circuit according to claim 3, characterized in that: The inverting acquisition circuit module includes a feedforward resistor, a second feedback resistor, a second operational amplifier and an analog-to-digital converter, wherein the feedforward resistor is connected to the inverting terminal of the second operational amplifier, the second feedback resistor is connected across the inverting terminal and the output terminal of the second operational amplifier, and the output terminal of the second operational amplifier is connected to the analog-to-digital converter; wherein the feedforward resistor R g2 and the second feedback resistor R f2 The following relationship is satisfied in terms of value: 。 6. A multi-channel RF component power supply fault detection circuit according to claim 5, characterized in that: The output terminal of the second operational amplifier outputs a second output voltage, which is connected to the input terminal of the analog-to-digital converter. The first output voltage is equal to the second output voltage in reverse phase.

7. A multi-channel RF component power supply fault detection circuit according to claim 6, characterized in that: The analog-to-digital converter is used to encode the second output voltage and determine whether the power supply voltage of each radio frequency component is normal by analyzing the encoding value.

8. The multi-channel RF component power supply fault detection circuit according to claim 7, characterized in that: The quantized code value of the analog-to-digital converter corresponds to the power supply voltage of each RF component. If the bit where the code value is located is "0", the power supply voltage of the RF component corresponding to the bit is abnormal.

9. A multi-channel RF component power supply fault detection circuit according to claim 8, characterized in that: The number of channels that can be detected by the circuit does not exceed the number of quantization bits of the analog-to-digital converter.

10. A multi-channel RF component power supply fault detection circuit according to claim 9, characterized in that: The supply voltage of each RF component is consistent with the reference voltage of the analog-to-digital converter.

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