CN219718193U - Feedback circuit for automatically repairing low duty ratio signal baseline - Google Patents
Feedback circuit for automatically repairing low duty ratio signal baseline Download PDFInfo
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- CN219718193U CN219718193U CN202222946104.4U CN202222946104U CN219718193U CN 219718193 U CN219718193 U CN 219718193U CN 202222946104 U CN202222946104 U CN 202222946104U CN 219718193 U CN219718193 U CN 219718193U
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Abstract
本发明涉及电流检测技术领域，主要涉及一种低占空比信号基线自动修复电路；所述的反馈电路应用于电流转电压电路中，包括一级反向放大电路和二级电路；所述的一级反向放大电路实现低通滤波；所述的二级电路对信号进行二次滤波，实现基线提取基线，经过电阻R1反馈到输入信号中，实现基线修复；具体通过反馈的形式动态调整信号中的基线，无需外部逻辑窗口做到实时反馈，电路简单，成本低，解决了存在的信号测量中基线漂移的问题。
The invention relates to the field of current detection technology, and mainly relates to a low duty cycle signal baseline automatic repair circuit; the feedback circuit is used in a current-to-voltage circuit and includes a first-level reverse amplification circuit and a second-level circuit; The first-level reverse amplification circuit realizes low-pass filtering; the second-level circuit performs secondary filtering on the signal to realize baseline extraction and feedback to the input signal through resistor R1 to realize baseline repair; specifically, the signal is dynamically adjusted in the form of feedback There is no need for an external logic window to achieve real-time feedback, the circuit is simple and the cost is low, which solves the existing problem of baseline drift in signal measurement.
Description
Technical Field
The utility model relates to the technical field of current detection, in particular to a feedback circuit for automatically repairing a low duty ratio signal baseline.
Background
Current transformers are a relatively widely used way of non-invasive current measurement.
As shown in fig. 1, the current ik for N charged particles of charge q per unit length on an infinitely long straight wire is expressed as:
the single-turn magnetic flux of the coil wound on the magnetic ring is:
wherein,,is a single-turn inductor
Wherein m=n S L 0 For the purpose of mutual inductance, the magnetic resonance device is provided with a magnetic resonance device,for self-inductance of the secondary winding, the current can be considered to be 1 turn of the primary winding.
The current drawn from the secondary winding resistor decays exponentially, the negative sign indicating that the direction of the current in the secondary winding is opposite to the direction of the beam current, its initial value I b /N S As a result of the beam impact response, τ=l s The exponential decay of/R is a characteristic of the secondary coil circuit (primary oscillating circuit) itself, which if decayed sufficiently slowly can be used to detect the shape of the current signal.
The existing baseline restoration technology in the current measurement field generally takes a logic signal synchronous with a measured signal as a time window, samples and holds a non-signal area outside the window as a background baseline, and then subtracts the held baseline from the signal area, thereby achieving the purpose of deducting the baseline and realizing baseline restoration. The main disadvantage of this solution is that it requires a logic signal synchronized with the signal, and that it requires a sample-and-hold circuit, which is complex and costly.
Disclosure of Invention
The utility model aims to provide a signal baseline automatic restoration circuit, in particular to a feedback circuit for low-duty ratio baseline automatic restoration, which is used for small-signal low-duty ratio baseline restoration and has the requirements on baseline restoration, and is used for solving the problems that an external logic window is needed, real-time dynamic feedback is not available, the circuit is complex and the cost is high in the existing baseline restoration method.
The technical scheme adopted by the utility model is as follows: a feedback circuit for automatically repairing a low duty ratio signal baseline is applied to a current-to-voltage circuit and comprises a primary reverse amplifying circuit and a secondary circuit.
In the first-stage reverse amplifying circuit, an operational amplifier OP2, a resistor R4 and a capacitor C2 are connected to form a Miller effect circuit, so that low-pass filtering is realized.
In the secondary circuit, a resistor R3 and a resistor R2 and a capacitor C1 are connected to form an integrating circuit, and secondary filtering is carried out on signals.
In the first-stage reverse amplifying circuit, a resistor R4 is connected with an operational amplifier OP2 in series, and a capacitor C2 is connected across the input end and the output end of the operational amplifier OP 2.
The first-stage reverse amplifying circuit is connected with a resistor R3 in the second-stage circuit in series, then is connected with an OP1, and a resistor R2 and a capacitor C1 at two ends of the OP1 are connected in parallel and fed back to an input signal through the resistor R1.
The beneficial effects of the utility model are as follows: the feedback circuit technical scheme adopted by the utility model is that a feedback capacitor is connected in series through an input resistor to form a Miller effect circuit, and the circuit is characterized in that a low-pass filter with extremely low frequency can be formed, the alternating current component in a signal is filtered through the feedback of the filter, the rest direct current component is reversely fed back to the input and subtracted from the input, a signal base line is subtracted, finally, the dynamic balance is achieved, and the base line is stabilized at zero; the baseline in the signal is dynamically adjusted in a feedback mode, real-time feedback is achieved without an external logic window, a circuit is simple, the cost is low, and the problem of baseline drift in signal measurement is solved.
Drawings
Fig. 1 is a schematic diagram of the relationship of magnetic flux to a coil wound on a magnetic ring.
FIG. 2 is a schematic diagram of the logic connections of the feedback circuit of the present utility model.
Detailed Description
Specific embodiments of the present utility model are described in detail below by way of specific examples:
as shown in FIG. 2, the feedback circuit for automatically repairing the low duty cycle signal baseline is applied to a current-to-voltage circuit, and is formed by connecting an input resistor in series with a feedback capacitor.
The feedback circuit is applied to a current-to-voltage circuit and comprises a primary reverse amplifying circuit and a secondary circuit, wherein: the operational amplifier OP2, the resistor R4 and the capacitor C2 in the first-stage reverse amplifying circuit form a Miller effect circuit to realize low-pass filtering; and a resistor R3 and a resistor R2 and a capacitor C1 in the secondary circuit form an integrating circuit, signals are subjected to secondary filtering, a baseline is extracted, and the signals are fed back to an input signal through the resistor R1, so that baseline restoration is realized.
In the protection primary reverse amplifying circuit, a resistor R4 is connected with an operational amplifier OP2 in series, and a capacitor C2 is connected across the input end and the output end of the operational amplifier OP 2; the first-stage reverse amplifying circuit is connected with a resistor R3 in the second-stage circuit in series, then is connected with an OP1, and a resistor R2 and a capacitor C1 at two ends of the OP1 are connected in parallel and fed back to an input signal through the resistor R1.
In this embodiment, when the method for repairing the signal baseline by adopting the feedback circuit for automatically repairing the signal baseline with a low duty ratio is mainly to apply the feedback circuit to the current-to-voltage circuit, and connect an input resistor in series with a miller effect circuit formed by a feedback capacitor, the miller effect circuit can form a low-pass filter with extremely low frequency, the alternating current component in the signal is filtered through the feedback of the filter, the remaining direct current component is reversely fed back to the input, subtracted from the input, the signal baseline is subtracted, finally, the dynamic balance is achieved, the baseline is stabilized at zero, thereby realizing the real-time dynamic adjustment of the baseline in the signal, realizing the real-time feedback without an external logic window, and solving the problem of baseline drift in the signal measurement.
The circuit is simple, is used in a feedback circuit which is used for small-signal, low-duty ratio and has the requirement on baseline restoration and is based on low-duty ratio baseline automatic restoration, and solves the problems that an external logic window is needed, real-time dynamic feedback is impossible, the circuit is complex and the cost is high in the existing baseline restoration method.
The foregoing examples are merely exemplary embodiments of the present utility model, which are described in more detail and are not to be construed as limiting the scope of the utility model. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the spirit of the utility model, and that these obvious alternatives fall within the scope of the utility model.
Claims (4)
1. A feedback circuit for automatic repair of low duty cycle signal baselines, characterized by: the feedback circuit is applied to a current-to-voltage circuit and comprises a primary reverse amplifying circuit and a secondary circuit; in the first-stage reverse amplifying circuit, an operational amplifier OP2, a resistor R4 and a capacitor C2 are connected to form a Miller effect circuit, so that low-pass filtering is realized.
2. A feedback circuit for automatic repair of low duty cycle signal baselines as set forth in claim 1, wherein: in the secondary circuit, a resistor R3 and a resistor R2 and a capacitor C1 are connected to form an integrating circuit, and secondary filtering is carried out on signals.
3. A feedback circuit for automatic repair of low duty cycle signal baselines as set forth in claim 1, wherein: in the first-stage reverse amplifying circuit, a resistor R4 is connected with an operational amplifier OP2 in series, and a capacitor C2 is connected across the input end and the output end of the operational amplifier OP 2.
4. A feedback circuit for automatic repair of low duty cycle signal baselines as set forth in claim 1, wherein: the first-stage reverse amplifying circuit is connected with a resistor R3 in the second-stage circuit in series, then is connected with an OP1, a resistor R2 and a capacitor C1 at two ends of the OP1 are connected in parallel, and the resistor R1 is fed back to an input signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222946104.4U CN219718193U (en) | 2022-11-04 | 2022-11-04 | Feedback circuit for automatically repairing low duty ratio signal baseline |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222946104.4U CN219718193U (en) | 2022-11-04 | 2022-11-04 | Feedback circuit for automatically repairing low duty ratio signal baseline |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219718193U true CN219718193U (en) | 2023-09-19 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222946104.4U Active CN219718193U (en) | 2022-11-04 | 2022-11-04 | Feedback circuit for automatically repairing low duty ratio signal baseline |
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| Country | Link |
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| CN (1) | CN219718193U (en) |
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2022
- 2022-11-04 CN CN202222946104.4U patent/CN219718193U/en active Active
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