Anti-interference signal level detection circuit and electronic equipment

Abstract

The utility model relates to the technical field of signal level detection, in particular to an anti-interference signal level detection circuit and electronic equipment. A rectification module, a filtering module and a digital signal output module; the input end of the rectifier module is connected with an external input signal source; the input end of the filter module is connected with the output end of the rectifier module; the output end of the rectification module is connected with the input end of the digital signal output module, and the output end of the digital signal output module is connected with an external digital signal acquisition circuit. According to the invention, unstable factors can be effectively filtered out, so that the signal is more stable and reliable, and the beneficial effects of improving the overall performance and reliability of the system and reducing the failure rate caused by external interference are achieved.

Description

Technical Field

[0001] This application relates to the technical field of signal level detection, and in particular to an anti-interference signal level detection circuit and electronic device. Background Technology

[0002] In complex circuit systems, power fluctuations and other heavy load interference often lead to unstable signal levels. This phenomenon not only hinders the normal operation of the system but can also cause misinterpretations by digital signal processors (DSPs). Specifically, when the external environment changes, such as increased temperature or stronger electromagnetic fields, sensitive components in the circuit are directly affected, resulting in changes in voltage or current. If these changes exceed the design limits, the signal level, which should remain constant, will fluctuate. For DSPs that rely on precise time sequences and logical relationships, even minute deviations can prevent them from correctly interpreting input data, leading to incorrect judgments or operations. Therefore, when designing such systems, it is essential to fully consider how to effectively suppress external noise and internal interference to ensure the integrity and accuracy of signal transmission.

[0003] To address the aforementioned technical issues and effectively suppress signal interference, the introduction of an anti-interference signal level detection circuit to effectively filter out unstable factors and ensure a more stable and reliable signal has become an urgent technical problem to be solved. Utility Model Content

[0004] To overcome the shortcomings of the prior art, this application provides an anti-interference signal level detection circuit, which can effectively filter out unstable factors, thereby ensuring that the signal is more stable and reliable, and thus achieving the beneficial effects of improving the overall performance and reliability of the system and reducing the failure rate caused by external interference.

[0005] The technical solution adopted by this application to solve its technical problem is:

[0006] In a first aspect, this application provides an anti-interference signal level detection circuit, the circuit comprising: a rectifier module, a filter module, and a digital signal output module;

[0007] The input terminal of the rectifier module is connected to an external signal source and is used to receive the signal to be processed output by the signal source.

[0008] The input terminal of the filtering module is connected to the output terminal of the rectifier module, and is used to filter the intermediate signal obtained by the rectifier module after rectifying the signal to be processed, so as to obtain a DC level signal.

[0009] The output terminal of the rectifier module is connected to the input terminal of the digital signal output module, and the output terminal of the digital signal output module is connected to an external digital signal acquisition circuit for sending the DC level signal to the digital signal output module and sending the corresponding digital signal to the digital signal acquisition circuit through the digital signal output module.

[0010] Optionally, the rectifier module includes a Schottky diode and a first capacitor;

[0011] The positive terminal of the Schottky diode is connected to the signal source, and the negative terminal is connected to one end of the first capacitor and the input terminal of the filter module.

[0012] The other end of the first capacitor is grounded.

[0013] Optionally, the Schottky diode used is model IN5819.

[0014] Optionally, the filtering module includes a first resistor, a second capacitor, and a second resistor;

[0015] One end of the first resistor is connected to the junction of the first capacitor and the Schottky diode, and the other end of the first resistor is connected to one end of the second capacitor and one end of the second resistor;

[0016] The other end of the second capacitor and the other end of the second resistor are grounded.

[0017] Optionally, the first resistor has a resistance of 10K and the second resistor has a resistance of 4.7K.

[0018] Optionally, the digital signal output module includes a transistor and a third resistor;

[0019] The base of the transistor is connected to the junction of the second capacitor and the second resistor, and the emitter of the transistor is grounded.

[0020] The collector of the transistor is connected to one end of the third resistor and the digital signal acquisition circuit, and the other end of the third resistor is connected to an external DC signal source.

[0021] Optionally, the transistor used is a 2N3904.

[0022] Secondly, this application provides an electronic device equipped with the aforementioned anti-interference signal level detection circuit.

[0023] The beneficial effects of this application are as follows: This application can first perform half-wave rectification on the signal to be detected (such as the reversing signal on a car) through a rectifier module. This is because heavy loads can affect the signal, causing interference signals to be mixed into the DC level. Half-wave rectification can remove the interference signals. Then, the intermediate signal obtained after half-wave rectification is filtered by a filter module, thereby further improving the stability of the signal and obtaining a reliable DC level signal. This DC level signal will trigger the digital signal output module, and finally be converted into a digital signal by the digital signal output module and transmitted to the digital signal acquisition circuit to complete the signal level acquisition. Attached Figure Description

[0024] Figure 1 This is a module connection diagram of the anti-interference signal level detection circuit provided in the embodiments of this application;

[0025] Figure 2 This is a circuit diagram of the anti-interference signal level detection circuit provided in the embodiments of this application. Detailed Implementation

[0026] The present application will be further described below with reference to the accompanying drawings and embodiments.

[0027] The following will clearly and completely describe the concept, specific structure, and resulting technical effects of this application in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of this application. Obviously, the described embodiments are only a part of the embodiments of this application, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are all within the scope of protection of this application. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this application can be combined interactively without contradicting each other.

[0028] Reference Figure 1 , Figure 1 This is a module connection diagram of the anti-interference signal level detection circuit provided in the embodiments of this application, including a rectification module, a filtering module, and a digital signal output module. Each module will be described in detail below:

[0029] The input terminal of the rectifier module is connected to an external signal source to receive the signal to be processed output by the signal source.

[0030] Regarding the rectifier module: The rectifier module includes diode-type devices. Diodes have unidirectional conductivity, allowing the signal to be detected and processed (such as a reversing signal in a car) to undergo half-wave rectification before being passed through the rectifier module. However, heavy loads can affect the signal, causing interference signals to be introduced into the DC level.

[0031] Furthermore, the input terminal of the filtering module is connected to the output terminal of the rectifier module, and is used to filter the intermediate signal obtained by the rectifier module after rectifying the signal to be processed, so as to obtain a DC level signal.

[0032] Regarding the filtering module: The intermediate signal obtained after half-wave rectification is filtered by the filtering module to further improve signal stability and obtain a reliable DC level signal. Various filtering designs can be achieved through different combinations of resistors and capacitors within the filtering module.

[0033] Furthermore, the output terminal of the rectifier module is connected to the input terminal of the digital signal output module, and the output terminal of the digital signal output module is connected to an external digital signal acquisition circuit for sending the DC level signal to the digital signal output module and sending the corresponding digital signal to the digital signal acquisition circuit through the digital signal output module.

[0034] Regarding the digital signal output module: The DC level signal obtained in the filtering module triggers the digital signal output module, which then converts it into a digital signal and transmits it to the digital signal acquisition circuit to complete signal level acquisition. The digital signal output module may include switching devices such as transistors to facilitate level switching for data acquisition.

[0035] Furthermore, referring to Figure 2 , Figure 2 This is a circuit schematic diagram of the anti-interference signal level detection circuit provided in the embodiments of this application, which is the above. Figure 1 The illustrated module design is a specific circuit design embodiment, which will be discussed below in conjunction with... Figure 2 Each module will be described in detail:

[0036] The rectifier module includes a Schottky diode D1 and a first capacitor C1;

[0037] The positive terminal of the Schottky diode D1 is connected to the signal source, and the negative terminal is connected to one end of the first capacitor C1 and the input terminal of the filter module.

[0038] The other end of the first capacitor C1 is grounded.

[0039] Specifically, Schottky diodes typically have lower breakdown voltages, but they have faster recovery speeds, making them suitable for high-frequency applications. Their recovery speed is also much higher than that of ordinary diodes, and they have lower losses. By combining the first capacitor C1 and the Schottky diode D1, the received signal to be processed is half-wave rectified. AC interference signals in the original signal to be processed are eliminated by grounding the first capacitor C1, resulting in an intermediate signal.

[0040] More specifically, the Schottky diode used in this embodiment is model IN5819.

[0041] Furthermore, the filtering module includes a first resistor R1, a second capacitor C2, and a second resistor R2;

[0042] One end of the first resistor R1 is connected to the connection point of the first capacitor C1 and the Schottky diode D1, and the other end of the first resistor R1 is connected to one end of the second capacitor C2 and one end of the second resistor R2.

[0043] The other end of the second capacitor C2 and the other end of the second resistor R2 are grounded.

[0044] Specifically, by adopting the above technical solution, the obtained intermediate signal is further filtered to improve the reliability of the signal and obtain a more stable DC level signal, thus avoiding errors in subsequent digital signal acquisition due to signal fluctuations.

[0045] Furthermore, the digital signal output module includes a transistor Q1 and a third resistor R3;

[0046] The base of transistor Q1 is connected to the junction of the second capacitor C2 and the second resistor R2, and the emitter of transistor Q1 is grounded.

[0047] The collector of the transistor Q1 is connected to one end of the third resistor R3 and the digital signal acquisition circuit, and the other end of the third resistor R3 is connected to an external DC signal source VCC.

[0048] Specifically, when the aforementioned DC level signal is a high level signal, since transistor Q1 is an NPN transistor, transistor Q1 is turned on in this case, allowing the signal to be output from the DC signal source VCC to ground through the third resistor R3, and a low level signal is acquired in this case; when the DC level signal is a low level signal, transistor Q1 is turned off, and the signal is output from the DC signal source VCC to the digital signal acquisition circuit through the third resistor R3, and a high level is acquired. The above steps are repeated to complete the digital signal acquisition.

[0049] More specifically, in this embodiment, the resistance of the first resistor R1 is 10K, and the resistance of the second resistor R2 is 4.7K. The detectable voltage level is calculated as (R2 / R1+R2)*Vsg (detection level), which is greater than the on-state voltage Vbe (0.65V) of the transistor Q1 in the digital signal output module. (Vsg-0.65V) / R1 needs to be less than the maximum saturation current of the transistor Q1. In this embodiment, the transistor used is a 2N3904. Based on the above formula, the detection DC voltage range of this application is 3-40V. Relevant personnel can adjust it according to actual needs, which is not limited here.

[0050] Secondly, this application provides an electronic device equipped with the aforementioned anti-interference signal level detection circuit.

[0051] The above is a detailed description of the preferred embodiments of this application. However, the invention of this application is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this application. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.

Claims

1. An anti-interference signal level detection circuit, characterized in that, The circuit includes: a rectifier module, a filter module, and a digital signal output module; The input terminal of the rectifier module is connected to an external signal source and is used to receive the signal to be processed output by the signal source. The input terminal of the filtering module is connected to the output terminal of the rectifier module, and is used to filter the intermediate signal obtained by the rectifier module after rectifying the signal to be processed, so as to obtain a DC level signal. The output terminal of the rectifier module is connected to the input terminal of the digital signal output module, and the output terminal of the digital signal output module is connected to an external digital signal acquisition circuit for sending the DC level signal to the digital signal output module and sending the corresponding digital signal to the digital signal acquisition circuit through the digital signal output module.

2. The anti-interference signal level detection circuit according to claim 1, characterized in that, The rectifier module includes a Schottky diode and a first capacitor; The positive terminal of the Schottky diode is connected to the signal source, and the negative terminal is connected to one end of the first capacitor and the input terminal of the filter module. The other end of the first capacitor is grounded.

3. The anti-interference signal level detection circuit according to claim 2, characterized in that, The Schottky diode used is model IN5819.

4. The anti-interference signal level detection circuit according to claim 2, characterized in that, The filtering module includes a first resistor, a second capacitor, and a second resistor; One end of the first resistor is connected to the junction of the first capacitor and the Schottky diode, and the other end of the first resistor is connected to one end of the second capacitor and one end of the second resistor; The other end of the second capacitor and the other end of the second resistor are grounded.

5. The anti-interference signal level detection circuit according to claim 4, characterized in that, The first resistor has a resistance of 10KΩ, and the second resistor has a resistance of 4.7KΩ.

6. The anti-interference signal level detection circuit according to claim 4, characterized in that, The digital signal output module includes a transistor and a third resistor; The base of the transistor is connected to the junction of the second capacitor and the second resistor, and the emitter of the transistor is grounded. The collector of the transistor is connected to one end of the third resistor and the digital signal acquisition circuit, and the other end of the third resistor is connected to an external DC signal source.

7. The anti-interference signal level detection circuit according to claim 6, characterized in that, The transistor used is a 2N3904.

8. An electronic device, characterized in that, It is equipped with an anti-interference signal level detection circuit as described in any one of claims 1-7.

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