Novel microwave system current detection circuit

Abstract

The utility model discloses a novel microwave system current detection circuit which comprises a detector D1, a sampling resistor R0, a capacitor C0, a capacitor C1, an operational amplifier D2, a diode D3, a resistor R1, a resistor R2, a capacitor C3, a capacitor C2, a resistor R3 and a resistor R4. According to the utility model, by designing the detector D1 and the operational amplifier D2, a voltage detection signal is input to the non-inverting input end of the operational amplifier D2 for following processing, so that the input signal is buffered and isolated, and the isolation effect is improved by adopting a voltage following mode.

Description

Technical Field

[0001] The utility model relates to the technical field of microwave systems, in particular to a novel microwave system current detection circuit. Background Art

[0002] BIT monitoring circuit is a relatively common circuit in microwave systems. There are many types of BIT monitoring circuits in microwave systems, including power detection, voltage detection, current detection, temperature detection and so on.

[0003] It is mainly used to convert the detection results into voltage form, output "0" or "1" after comparison by the comparator, and perform online fault monitoring of the hardware and software of the microwave system. However, the current detection circuit has poor isolation effect. Therefore, it is necessary to provide a current detection circuit with good isolation effect to avoid the occurrence of this problem. Utility Model Content

[0004] Purpose of the utility model: to provide a new microwave system current detection circuit to solve the above problems existing in the prior art.

[0005] Technical solution: A new microwave system current detection circuit, including:

[0006] Detector D1, sampling resistor R0, capacitor C0, capacitor C1, operational amplifier D2, diode D3, resistor R1, resistor R2, capacitor C3, capacitor C2, resistor R3, resistor R4;

[0007] The VS pin of the detector D1 is connected to a +5V power supply and one end of a capacitor C0;

[0008] The IN+ pin of the detector D1 is connected to a +8V voltage;

[0009] The IN- pin of the detector D1 is connected to one end of the sampling resistor R0, and the other end of the sampling resistor R0 is connected to a +8V voltage;

[0010] The GND pin of the detector D1 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is connected to one end of the sampling resistor R0 and connected to the peripheral working circuit;

[0011] The OUT pin of the detector D1 is connected to the non-inverting input terminal of the operational amplifier D2, the inverting input terminal and the output terminal of the operational amplifier D2 are connected to the anode of the diode D3 and one end of the resistor R1, and the cathode of the diode D3 is connected to the resistor R2, the capacitor C3, the capacitor C2, and one end of the resistor R3;

[0012] The other end of the resistor R3 is connected to one end of the resistor R4 and receives the BIT signal;

[0013] The positive power supply terminal of the operational amplifier D2 is connected to a +5V power supply, and the negative power supply terminal is connected to the other ends of the resistor R1, the resistor R2, the capacitor C3, the capacitor C2, and the resistor R4.

[0014] The utility model designs a detector D1 and an operational amplifier D2, inputs a voltage detection signal to the same-direction input terminal of the operational amplifier D2 for following processing, so that the input signal is buffered and isolated, and adopts a voltage following method to improve the isolation effect.

[0015] In a further embodiment, the GND pin of the detector D1 and one end of the capacitor C1 are grounded.

[0016] In a further embodiment, the other end of the capacitor C0 is grounded.

[0017] In a further embodiment, the RESET, ALERT, and LTMIT pins of the detector D1 are grounded.

[0018] In a further embodiment, the negative power supply terminal of the operational amplifier D2, the resistor R1, the resistor R2, the capacitor C3, the capacitor C2, and the other end of the resistor R4 are grounded.

[0019] Beneficial effects: The utility model discloses a novel microwave system current detection circuit. The utility model designs a detector D1 and an operational amplifier D2, inputs a voltage detection signal to the same-direction input terminal of the operational amplifier D2 for follow-up processing, so that the input signal is buffered and isolated, and adopts a voltage following method to improve the isolation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a structural diagram of the present utility model. DETAILED DESCRIPTION

[0021] The present application relates to a novel microwave system current detection circuit, which is explained in detail below through specific implementation methods.

[0022] A novel microwave system current detection circuit, comprising:

[0023] Detector D1, sampling resistor R0, capacitor C0, capacitor C1, operational amplifier D2, diode D3, resistor R1, resistor R2, capacitor C3, capacitor C2, resistor R3, resistor R4;

[0024] The detector D1 is an XCA4001 current detection chip;

[0025] The VS pin of the detector D1 is connected to a +5V power supply and one end of a capacitor C0;

[0026] The IN+ pin of the detector D1 is connected to a +8V voltage;

[0027] The IN- pin of the detector D1 is connected to one end of the sampling resistor R0, and the other end of the sampling resistor R0 is connected to a +8V voltage;

[0028] The GND pin of the detector D1 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is connected to one end of the sampling resistor R0 and connected to the peripheral working circuit;

[0029] The OUT pin of the detector D1 is connected to the non-inverting input terminal of the operational amplifier D2, the inverting input terminal and the output terminal of the operational amplifier D2 are connected to the anode of the diode D3 and one end of the resistor R1, and the cathode of the diode D3 is connected to the resistor R2, the capacitor C3, the capacitor C2, and one end of the resistor R3;

[0030] The other end of the resistor R3 is connected to one end of the resistor R4 and receives the BIT signal;

[0031] The positive power supply terminal of the operational amplifier D2 is connected to a +5V power supply, and the negative power supply terminal is connected to the other ends of the resistor R1, the resistor R2, the capacitor C3, the capacitor C2, and the resistor R4.

[0032] By designing the detector D1 and the operational amplifier D2, the voltage detection signal is input to the non-inverting input terminal of the operational amplifier D2 for following processing, so that the input signal is buffered and isolated, and the voltage following method is adopted to improve the isolation effect.

[0033] At the same time, the working current can be converted into voltage in proportion, and the reference level peak can be adjusted using a resistor voltage divider circuit, which is suitable for all microwave BIT current monitoring circuits.

[0034] A GND pin of the detector D1 and one end of the capacitor C1 are grounded.

[0035] The other end of the capacitor C0 is grounded.

[0036] The RESET, ALERT, and LTMIT pins of the detector D1 are grounded.

[0037] The negative power supply terminal of the operational amplifier D2, the resistor R1, the resistor R2, the capacitor C3, the capacitor C2, and the other end of the resistor R4 are grounded.

[0038] Working principle description: During operation, +8V voltage flows through the sampling resistor R0, and the detector D1 outputs the corresponding detection voltage Vo. During this period, the weak voltage signal undergoes amplification. The voltage detection signal Vo is input to the non-inverting input terminal of the operational amplifier D2 for follow-up processing, so that the input signal is buffered and isolated.

[0039] The output signal of the operational amplifier D2 is input to the diode D3, which does not conduct the low-level portion of the input signal, and the output voltage signal of this portion is maintained within a predetermined range (which may be 0.6V to 0.7V).

[0040] Capacitor C3 is used to extend the falling edge time of the signal and widen the pulse electrical signal. At the same time, resistors R3 and R4 are used to adjust the voltage division to complete the adjustment of the BIT signal peak value and amplitude, and obtain the voltage information Vp of the equivalent current.

[0041] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all fall within the scope of protection of the present invention.

Claims

1. A new type of microwave system current detection circuit, characterized in that: include: Detector D1, sampling resistor R0, capacitor C0, capacitor C1, operational amplifier D2, diode D3, resistor R1, resistor R2, capacitor C3, capacitor C2, resistor R3, resistor R4; The VS pin of the detector D1 is connected to a +5V power supply and one end of a capacitor C0; The IN+ pin of the detector D1 is connected to a +8V voltage; The IN- pin of the detector D1 is connected to one end of the sampling resistor R0, and the other end of the sampling resistor R0 is connected to a +8V voltage; The GND pin of the detector D1 is connected to one end of the capacitor C1, and the other end of the capacitor C1 is connected to one end of the sampling resistor R0; The OUT pin of the detector D1 is connected to the non-inverting input terminal of the operational amplifier D2, the inverting input terminal and the output terminal of the operational amplifier D2 are connected to the anode of the diode D3 and one end of the resistor R1, and the cathode of the diode D3 is connected to the resistor R2, the capacitor C3, the capacitor C2, and one end of the resistor R3; The other end of the resistor R3 is connected to one end of the resistor R4 and receives the BIT signal; The positive power supply terminal of the operational amplifier D2 is connected to a +5V power supply, and the negative power supply terminal is connected to the other ends of the resistor R1, the resistor R2, the capacitor C3, the capacitor C2, and the resistor R4.

2. The novel microwave system current detection circuit according to claim 1 is characterized in that: A GND pin of the detector D1 and one end of the capacitor C1 are grounded.

3. The novel microwave system current detection circuit according to claim 1, characterized in that: The other end of the capacitor C0 is grounded.

4. The novel microwave system current detection circuit according to claim 1 is characterized in that: The RESET, ALERT, and LTMIT pins of the detector D1 are grounded.

5. The novel microwave system current detection circuit according to claim 1 is characterized in that: The negative power supply terminal of the operational amplifier D2, the resistor R1, the resistor R2, the capacitor C3, the capacitor C2, and the other end of the resistor R4 are grounded.

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