Cloud box

Abstract

The application discloses a cloud box, the cloud box is provided with a TYPE-C port, the cloud box is internally provided with an isolation circuit, a filter circuit and a CPU, the input end of the isolation circuit is electrically connected with the TYPE-C port, and the output end of the isolation circuit is connected to the CPU through the filter circuit. According to the cloud box, the isolation circuit and the filter circuit are introduced, so that the purity and the stability of the input signal entering the cloud box from the TYPE-port can be improved.

Description

Technical Field

[0001] This application belongs to the field of electronic engineering technology, and particularly relates to a cloud box. Background Art

[0002] In the context of the rapid development of cloud computing and the Internet of Things, as a key hardware connecting terminal devices and cloud services, cloud boxes face challenges such as complex power management, strict electromagnetic compatibility (EMC) requirements, insufficient input protection, and high demands for signal processing accuracy and electrical isolation. Existing cloud box solutions have limitations in addressing these challenges, especially in ensuring the stability of power supply, resisting electromagnetic interference, preventing damage caused by improper operation, maintaining signal quality, and providing necessary electrical isolation. Summary of the Invention

[0003] The main purpose of this application is to provide a cloud box, which can improve the purity and stability of signal transmission in the cloud box.

[0004] To achieve the above objectives, this application provides the following technical solutions:

[0005] A cloud box is provided with a TYPE-C port on it, and an isolation circuit, a filtering circuit, and a CPU are arranged inside the cloud box. Among them, the input end of the isolation circuit is electrically connected to the TYPE-C port, and the output end of the isolation circuit is connected to the CPU through the filtering circuit; the isolation circuit includes: a first input protection module, a second input protection module, an isolation module, and an output protection module. Among them, the first input protection module is used to provide reverse connection protection; the second input protection module is used to provide overcurrent protection and electromagnetic interference suppression; the isolation module is used to provide electrical isolation between the external power supply and the filtering circuit as well as the CPU; the output protection module is used to ensure the stability of the output voltage of the isolation circuit.

[0006] Optionally, the first input protection module includes: a first diode and a second diode. Among them, the cathode of the first diode is connected to the ground pin of the TYPE-C port, the anode of the second diode is connected to the second positive pin of the TYPE-C port, and the anode of the first diode and the cathode of the second diode are commonly connected to a second ground terminal; the second input protection module includes: a fuse, a common mode choke coil, a sixth capacitor, and a seventh capacitor. Among them, the first end of the fuse is connected to the first positive pin of the TYPE-C port, the second end of the fuse is connected to the first end of the common mode choke coil, the first end of the sixth capacitor is connected to the second end of the common mode choke coil, the second end of the sixth capacitor is connected to the isolation module, and the seventh capacitor is connected in parallel across the two ends of the sixth capacitor.

[0007] Optionally, the isolation module includes: an isolation DC-DC converter, an eighth capacitor, and a ninth capacitor. Among them, the input end of the isolation DC-DC converter is connected to the second end of the sixth capacitor, the first end of the eighth capacitor is connected to the output end of the isolation DC-DC converter, the second end of the eighth capacitor is connected to the output protection module, and the ninth capacitor is connected in parallel across the two ends of the eighth capacitor.

[0008] Optionally, the output protection module includes: a voltage regulator, a fourteenth resistor, and a fifteenth resistor. Among them, the input end of the voltage regulator is connected to the second end of the eighth capacitor, the output end of the voltage regulator is connected to the filter circuit, the first end of the fourteenth resistor is connected to the output end of the voltage regulator, and the second end of the fourteenth resistor is connected to the third grounding terminal through the fifteenth resistor.

[0009] Optionally, the filter circuit includes: an input protection and preliminary filtering module, an amplification and negative feedback control module, a filtering and gain adjustment module, an output regulation and dynamic feedback stabilization module, a feedback signal transmission module, an output filtering module, and a voltage regulation and DC coupling module. Among them, the input protection and preliminary filtering module is used to provide input protection for the CPU and perform preliminary filtering on the input signal entering from the TYPE-C port; the amplification and negative feedback control module is used to amplify the preliminarily filtered input signal and maintain the linearity of the input signal through negative feedback; the filtering and gain adjustment module is used to perform low-pass filtering on the amplified input signal and adjust the signal gain of the input signal; the output regulation and dynamic feedback stabilization module is used to finely adjust the low-pass filtered input signal and maintain the stability of the filter circuit through dynamic feedback; the feedback signal transmission module is used to establish a feedback path between the output filtering module and the amplification and negative feedback control module; the output filtering module is used to filter out high-frequency noise in the finely adjusted input signal; the voltage regulation and DC coupling module is used to provide precise voltage regulation and ensure DC bias transmission.

[0010] Optionally, the input protection and preliminary filtering module includes: a first capacitor and a first resistor. Among them, the first end of the first capacitor is connected to the output pin of the TYPE-C port, and the second end of the first capacitor is connected to the amplification and negative feedback control module through the first resistor.

[0011] Optionally, the amplification and negative feedback control module includes: a first operational amplifier, a second resistor, a third resistor, a fourth resistor, a fifth resistor, and a sixth resistor. Among them, the first end of the second resistor is connected to the inverting input terminal of the first operational amplifier, and the second end of the second resistor is connected to the output terminal of the first operational amplifier to form a first node; the first end of the third resistor is connected to the first node, and the second end of the third resistor is connected to the first input terminal of the filtering and gain adjustment module via the fourth resistor; the first end of the fifth resistor is connected to the second end of the first resistor and simultaneously connected to the non-inverting input terminal of the first operational amplifier, and the second end of the fifth resistor is connected to the second input terminal of the filtering and gain adjustment module; the first end of the sixth resistor is connected to the inverting input terminal of the first operational amplifier, and the second end of the sixth resistor is connected to the first input terminal of the output adjustment and dynamic feedback stabilization module.

[0012] Optionally, the filtering and gain adjustment module includes: a second operational amplifier, a second capacitor, a seventh resistor, and an eighth resistor. Among them, the first end of the second capacitor is connected to the inverting input terminal of the second operational amplifier and serves as the first input terminal of the filtering and gain adjustment module; the second end of the second capacitor is connected to the output terminal of the second operational amplifier to form a second node, and the second node serves as the second input terminal of the filtering and gain adjustment module; the first end of the seventh resistor is connected to the second node, and the second end of the seventh resistor is connected to the first input terminal of the output adjustment and dynamic feedback stabilization module via the eighth resistor; the non-inverting input terminal of the second operational amplifier serves as the second input terminal of the filtering and gain adjustment module and is connected to the second input terminal of the output adjustment and dynamic feedback stabilization module and the second input terminal of the output filtering module to form a fourth node.

[0013] Optionally, the output adjustment and dynamic feedback stabilization module includes: a third operational amplifier, a third capacitor, a ninth resistor, and a tenth resistor. Among them, the first end of the third capacitor is connected to the inverting input terminal of the third operational amplifier and serves as the first input terminal of the output adjustment and dynamic feedback stabilization module, and the second end of the third capacitor is connected to the output terminal of the third operational amplifier to form a third node; the first end of the ninth resistor is connected to the third node, and the second end of the ninth resistor is connected to the first input terminal of the output filtering module; the non-inverting input terminal of the third operational amplifier serves as the second input terminal of the output adjustment and dynamic feedback stabilization module.

[0014] Optionally, the feedback signal transmission module includes a tenth resistor. The first end of the tenth resistor is connected to the first node, and the second end of the tenth resistor is connected to the first input terminal of the output filtering module.

[0015] Optionally, the output filtering module includes: a fourth operational amplifier, an eleventh resistor, and a fourth capacitor. Among them, the inverting input terminal of the fourth operational amplifier serves as the first input terminal of the output filtering module, and the non-inverting input terminal serves as the second input terminal of the output filtering module; the first end of the eleventh resistor is connected to the second end of the tenth resistor, and the second end of the eleventh resistor is connected to the output terminal of the fourth operational amplifier; the first end of the fourth capacitor is connected to the output terminal of the fourth operational amplifier, and the second end of the fourth capacitor serves as the output terminal of the filtering circuit.

[0016] Optionally, the voltage regulation and DC coupling module includes: a fifth capacitor, a twelfth resistor, and a thirteenth resistor. Among them, the first end of the fifth capacitor is connected to the fourth node, and the second end of the fifth capacitor is connected to the first ground terminal; the first end of the thirteenth resistor is connected to the fourth node, and the second end of the thirteenth resistor is connected to the positive pole of the 12V DC power supply; the first end of the twelfth resistor is connected to the fourth node, and the second end of the twelfth resistor is connected to the negative pole of the 12V DC power supply.

[0017] The present application can bring the following beneficial effects: By introducing an isolation circuit and a filtering circuit, the present application can ensure that every link from input to output of the cloud box can operate efficiently and maintain the purity and stability of the signal. Description of the Drawings

[0018] Figure 1 is a schematic structural diagram of a cloud box provided by an embodiment of the present application;

[0019] Figure 2 is a schematic structural diagram of the isolation circuit provided by another embodiment of the present application;

[0020] Figure 3 is a schematic structural diagram of the filtering circuit provided by another embodiment of the present application. Detailed Embodiments

[0021] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0022] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0023] In the present invention, unless otherwise clearly specified and defined, terms such as "connection" and "fixation" shall be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0024] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one of such features. In addition, the meaning of "and / or" appearing throughout the text includes three parallel scenarios. Taking "A and / or B" as an example, it includes Scenario A, or Scenario B, or the scenario where both A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0025] Figure 1 FIG. is a schematic structural diagram of a cloud box according to an embodiment of the present application, as Figure 1 shown, the cloud box is provided with a TYPE-C port, and an isolation circuit, a filtering circuit and a CPU are arranged inside the cloud box. Among them, the input end of the isolation circuit is electrically connected to the TYPE-C port, and the output end of the isolation circuit is connected to the CPU through the filtering circuit.

[0026] In this embodiment, by arranging the isolation circuit and the filtering circuit, the present application enables the cloud box to significantly enhance the electromagnetic compatibility and anti-interference ability, ensures that its internal components such as the CPU obtain stable and pure power supply and signal input, and at the same time protects sensitive electronic components from external power anomalies and electromagnetic interference, thereby greatly improving the stability and reliability of the system, optimizing the accuracy and efficiency of data processing, and providing a solid guarantee for the efficient and stable connection between the terminal device and the cloud service.

[0027] In another exemplary embodiment, as Figure 2As shown, the isolation circuit includes: a first input protection module 201, a second input protection module 202, an isolation module 203, and an output protection module 204. Among them, the first input protection module 201 is used to provide reverse connection protection; the second input protection module 202 is used to provide overcurrent protection and electromagnetic interference suppression; the isolation module 203 is used to provide electrical isolation between the external power supply and the filtering circuit and the CPU; the output protection module 204 is used to ensure the stability of the output voltage of the isolation circuit.

[0028] In another exemplary embodiment, the first input protection module 201 includes a first diode D1 and a second diode D2. Among them, the cathode of the first diode D1 is connected to the ground pin GND of the TYPE-C port, the anode of the second diode D2 is connected to the second positive pin Vbus2 of the TYPE-C port, and the anode of the first diode D1 and the cathode of the second diode D2 are commonly connected to a second ground terminal GND2.

[0029] In this embodiment, when the polarity of the external power supply responsible for powering the cloud box is correct, that is, the second positive pin Vbus2 of the TYPE-C port is at a positive voltage and the ground pin GND is at ground potential, the second diode D2 will not conduct because its anode is positive relative to the cathode; at the same time, the cathode potential of the first diode D1 is lower than the anode potential, so it also does not conduct. At this time, the current will not flow through these two diodes, and the external power supply can normally power the cloud box. When the polarity of the external power supply is reversed, that is, the second positive pin Vbus2 of the TYPE-C port is accidentally connected to ground potential or a lower potential, and the ground pin GND is wrongly applied with a positive voltage, the cathode of the second diode D2 will be at a lower potential, thus conducting, so that any possible reverse current is guided to the second ground terminal GND2 instead of flowing into other circuits of the cloud box. Similarly, if the ground pin GND is wrongly applied with a high potential, the first diode D1 will conduct, discharging the high potential to the second ground terminal GND2, thereby protecting other circuits (such as the CPU) in the cloud box from being affected by excessive voltage.

[0030] In the above manner, the first input protection module 201 can prevent reverse current from entering the internal circuit of the cloud box in the case of reverse polarity of the external power supply, thereby avoiding potential damage to the CPU.

[0031] In another exemplary embodiment, the second input protection module 202 includes a fuse F, a common-mode choke coil L, a sixth capacitor C6, and a seventh capacitor C7. Among them, the first end of the fuse F is connected to the first positive pin Vbus1 of the TYPE-C port, the second end of the fuse F is connected to the first end of the common-mode choke coil L, the first end of the sixth capacitor C6 is connected to the second end of the common-mode choke coil L, the second end of the sixth capacitor C6 is connected to the isolation module, and the seventh capacitor C7 is connected in parallel across both ends of the sixth capacitor C6.

[0032] In this embodiment, the fuse F, as an overcurrent protection device, is connected between the first positive pin Vbus1 of the TYPE-C port and the common-mode choke coil L. Its function is to automatically blow when the input current exceeds a preset safety limit value, cutting off the current path to prevent the downstream circuit from being damaged due to overcurrent.

[0033] The common-mode choke coil L is used to suppress common-mode noise. When the input current flows through the common-mode choke coil L, the differential-mode current (the current for normal operation) can pass through smoothly, while the common-mode current (such as electromagnetic interference) will be blocked, thereby reducing the negative impact on the internal circuit of the cloud box.

[0034] The first end of the sixth capacitor C6 and the seventh capacitor C7 form a low-pass filter, which can remove high-frequency noise and ripples in the input current, making the input current reaching the isolation module smoother and more stable.

[0035] In another exemplary embodiment, the isolation module 203 includes an isolated DC-DC converter U5, an eighth capacitor C8, and a ninth capacitor C9. Among them, the input end of the isolated DC-DC converter U5 is connected to the second end of the sixth capacitor C6, the first end of the eighth capacitor C8 is connected to the output end of the isolated DC-DC converter U5, the second end of the eighth capacitor C8 is connected to the output protection module, and the ninth capacitor C9 is connected in parallel across both ends of the eighth capacitor C8.

[0036] In this embodiment, the isolated DC-DC converter U5 can provide electrical isolation between the input and the output. This means that there is no direct electrical connection between the input side and the output side, and only energy is transferred through magnetic components such as transformers. This design can effectively prevent ground loop problems, reduce electromagnetic interference, and protect the downstream circuit from high voltages or current spikes that may exist upstream.

[0037] In addition, the eighth capacitor C8 and the ninth capacitor C9 form a capacitive filter circuit, which can effectively reduce the ripple and noise in the output voltage of the isolated DC-DC converter U5, thereby providing a purer and more stable direct current to ensure the high quality and smoothness of the output voltage of the isolated DC-DC converter U5.

[0038] In another exemplary embodiment, the output protection module 204 includes a voltage regulator U6, a fourteenth resistor R14, and a fifteenth resistor R15. Among them, the input end of the voltage regulator U6 is connected to the second end of the eighth capacitor C8, the output end of the voltage regulator U6 is connected to the filter circuit, the first end of the fourteenth resistor R14 is connected to the output end of the voltage regulator U6, and the second end of the fourteenth resistor R14 is connected to the third ground terminal GND3 through the fifteenth resistor R15.

[0039] In this embodiment, the voltage regulator U6 receives the filtered DC voltage from the eighth capacitor C8 and the ninth capacitor C9 as input, and can adjust the filtered DC voltage to a constant and accurate output voltage level to meet the requirements of the CPU and other internal circuits.

[0040] The fourteenth resistor R14 and the fifteenth resistor R15 form a voltage division network, which is used to monitor and feedback the output voltage of the voltage regulator U6, so that the output voltage output by the voltage regulator U6 to the CPU is maintained in a stable and accurate state. In addition, the fourteenth resistor R14 is grounded through the fifteenth resistor R15, which helps to maintain the stability of the feedback path, can avoid instability or noise problems caused by floating potential, and thus can ensure the reliability and accuracy of the feedback signal.

[0041] In another exemplary embodiment, as Figure 3As shown in the figure, the filtering circuit includes: an input protection and preliminary filtering module 101, an amplification and negative feedback control module 102, a filtering and gain adjustment module 103, an output adjustment and dynamic feedback stabilization module 104, a feedback signal transmission module 105, an output filtering module 106, and a voltage stabilization and DC coupling module 107. Among them, the input protection and preliminary filtering module 101 is used to provide input protection for the CPU and perform preliminary filtering on the input signal entering from the TYPE-C port; the amplification and negative feedback control module 102 is used to amplify the preliminarily filtered input signal and maintain the linearity of the input signal through negative feedback; the filtering and gain adjustment module 103 is used to perform low-pass filtering on the amplified input signal and adjust the signal gain of the input signal; the output adjustment and dynamic feedback stabilization module 104 is used to finely adjust the low-pass filtered input signal and maintain the stability of the filtering circuit through dynamic feedback; the feedback signal transmission module 105 is used to establish a feedback path between the output filtering module 106 and the amplification and negative feedback control module 102; the output filtering module 106 is used to filter out high-frequency noise in the finely adjusted input signal; the voltage stabilization and DC coupling module 107 is used to provide precise voltage stabilization and ensure DC bias transfer.

[0042] In another exemplary embodiment, the input protection and preliminary filtering module 101 includes a first capacitor C1 and a first resistor R1. Among them, the first end of the first capacitor C1 is connected to the output pin of the TYPE-C port, and the second end of the first capacitor C1 is connected to the amplification and negative feedback control module 102 through the first resistor R1.

[0043] In this embodiment, the first capacitor C1 and the first resistor R1 form an RC low-pass filter, which can reduce the high-frequency components in the signal transmitted from the TYPE-C port, ensuring that only a relatively pure and close-to-original signal can be transmitted to the amplification and negative feedback control module 102.

[0044] In another exemplary embodiment, the amplification and negative feedback control module 102 includes a first operational amplifier U1, a second resistor R2, a third resistor R3, a fourth resistor R4, a fifth resistor R5, and a sixth resistor R6. Among them, a first end of the second resistor R2 is connected to an inverting input terminal of the first operational amplifier U1, a second end of the second resistor R2 is connected to an output terminal of the first operational amplifier U1 to form a first node N1, a first end of the third resistor R3 is connected to the first node N1, a second end of the third resistor R3 is connected to a first input terminal of the filtering and gain adjustment module 103 via the fourth resistor R4, a first end of the fifth resistor R5 is connected to a second end of the first resistor R1 and simultaneously connected to a non-inverting input terminal of the first operational amplifier U1, a second end of the fifth resistor R5 is connected to a second input terminal of the filtering and gain adjustment module 103, a first end of the sixth resistor R6 is connected to the inverting input terminal of the first operational amplifier U1, and a second end of the sixth resistor R6 is connected to a first input terminal of the output adjustment and dynamic feedback stabilization module 104.

[0045] In this embodiment, the first end of the second resistor R2 is connected to the inverting input terminal of the first operational amplifier U1, and the second end of the second resistor R2 is connected to the output terminal of the first operational amplifier U1, forming a voltage series negative feedback loop. Whenever a voltage change occurs at the output terminal of the first operational amplifier U1, this part of the change will be immediately fed back to the inverting input terminal of the first operational amplifier U1 through the second resistor R2, so that the output voltage of the first operational amplifier U1 can be stabilized at a specific ratio (when there is negative feedback, the first operational amplifier U1 will automatically adjust its output to make the voltage difference between the inverting input terminal and the non-inverting input terminal tend to zero). Moreover, since this feedback path is a direct path from the output to the input, this feedback is almost instantaneous. By forming a negative feedback loop, any random noise that appears in the first operational amplifier U1 can be weakened by the feedback mechanism, thereby improving the signal-to-noise ratio of the output signal of the first operational amplifier U1.

[0046] The second end of the sixth resistor R6 is connected to the output regulation and dynamic feedback stabilization module 104. This design enables the sixth resistor R6 not only to participate in the negative feedback path within the amplification and negative feedback control module 102 but also to play a crucial role in transmitting the signal preliminarily amplified by the first operational amplifier U1 to the next processing stage. Through the sixth resistor R6, the signal that has been amplified by the first operational amplifier U1 can be transmitted to subsequent modules without loss for further processing or adjustment. This design allows the output regulation and dynamic feedback stabilization module 104 to respond and make dynamic adjustments based on the output state of the amplification and negative feedback control module 102. For example, if the output regulation and dynamic feedback stabilization module 104 detects that the output voltage deviates from the expected value, it can utilize the information received from the sixth resistor R6 to adjust its own parameters, such as changing the output voltage level or adjusting the filtering characteristics, to ensure the quality of the final output. In this way, an inter-module feedback loop is actually formed. The output regulation and dynamic feedback stabilization module 104 can not only make local adjustments based on the signal transmitted by the sixth resistor R6 but also feed back the adjusted result to the amplification and negative feedback control module 102 again, thereby implementing a more complex control logic at the level of the entire filtering circuit, enabling the filtering circuit to output a stable and higher-precision signal.

[0047] The fifth resistor R5 can provide a stable DC bias path for the first operational amplifier U1. By connecting to the filtering and gain adjustment module 103, the filtering and gain adjustment module 103 provides a processed and relatively stable DC voltage, which is transmitted as a reference signal to the first operational amplifier U1 through the fifth resistor R5. In this way, the fifth resistor R5 can ensure that the first operational amplifier U1 operates at an appropriate DC operating point, thereby contributing to maintaining the linearity and output stability of the first operational amplifier U1.

[0048] In another exemplary embodiment, the filtering and gain adjustment module 103 includes a second operational amplifier U2, a second capacitor C2, a seventh resistor R7, and an eighth resistor R8. Among them, the first end of the second capacitor C2 is connected to the inverting input terminal of the second operational amplifier U2 and serves as the first input terminal of the filtering and gain adjustment module. The second end of the second capacitor C2 is connected to the output terminal of the second operational amplifier U2 to form a second node N2, and the second node N2 is used as the second input terminal of the filtering and gain adjustment module. The first end of the seventh resistor R7 is connected to the second node N2, and the second end of the seventh resistor R7 is connected to the first input terminal of the output adjustment and dynamic feedback stabilization module 104 through the eighth resistor R8. The non-inverting input terminal of the second operational amplifier U2 serves as the second input terminal of the filtering and gain adjustment module 103 and is connected to the second input terminal of the output adjustment and dynamic feedback stabilization module 104 and the second input terminal of the output filtering module 106 to form a fourth node N4.

[0049] In this embodiment, the first end of the second capacitor C2 is connected to the second end of the fourth resistor R4 and is simultaneously connected to the inverting input terminal of the second operational amplifier U2. The second end of the second capacitor C2 is connected to the output terminal of the second operational amplifier U2. This configuration constitutes an integrator circuit. When high-frequency components attempt to pass through the second capacitor C2, due to its fast-changing characteristics, the second capacitor C2 must charge and discharge very quickly to follow the change of the input voltage. However, since the charging and discharging process of the capacitor is not instantaneous but requires a certain amount of time, high-frequency signals cannot be immediately and completely transmitted to the output terminal of the third operational amplifier U3. Instead, these high-frequency components will accumulate a certain amount of charge on the second capacitor C2, thereby forming a local voltage drop. This local voltage drop is equivalent to applying an additional "resistance" to the high-frequency components, causing them to be attenuated or weakened during transmission. That is, the second capacitor C2 can effectively remove the high-frequency noise in the output signal from the amplification and negative feedback control module 102, ensuring that only relatively pure low-frequency signals enter the subsequent processing stage. In addition, the second capacitor C2, the seventh resistor R7, and the eighth resistor R8 form an RC low-pass filter, enabling the low-frequency signals in the output signal of the amplification and negative feedback control module 102 to be transmitted to the subsequent module, thereby achieving the low-pass filtering effect of the signal.

[0050] In another exemplary embodiment, the output regulation and dynamic feedback stabilization module 104 includes a third operational amplifier U3, a third capacitor C3, and a ninth resistor R9. Among them, the first end of the third capacitor C3 is connected to the inverting input terminal of the third operational amplifier U3 and serves as the first input terminal of the output regulation and dynamic feedback stabilization module 104. The second end of the third capacitor C3 is connected to the output terminal of the third operational amplifier U3 to form a third node N3. The first end of the ninth resistor R9 is connected to the third node N3, and the second end of the ninth resistor R9 is connected to the first input terminal of the output filtering module 105. The non-inverting input terminal of the third operational amplifier U3 serves as the second input terminal of the output regulation and dynamic feedback stabilization module 104.

[0051] In this embodiment, the first end of the third capacitor C3 is connected to the inverting input terminal of the third operational amplifier U3, and the second end of the third capacitor C3 is connected to the output terminal of the third operational amplifier U3, which also constitutes an integrator circuit. For the high-frequency components in the output signal of the filtering and gain adjustment module 103, the third capacitor C3 exhibits a relatively high impedance, causing these high-frequency components to charge on the third capacitor C3 and be attenuated. On the contrary, the low-frequency components in the output signal of the filtering and gain adjustment module 103 can be transmitted to the subsequent module through the RC network composed of the third capacitor C3 and the ninth resistor R9, thereby achieving a low-pass filtering effect on the output signal of the filtering and gain adjustment module 103, which helps to remove unwanted high-frequency noise and ensure the purity of the output signal.

[0052] In another exemplary embodiment, the feedback signal transmission module 105 includes a tenth resistor R10. The first end of the tenth resistor R10 is connected to the first node N1, and the second end of the tenth resistor R10 is connected to the first input terminal of the output filtering module 106, thereby forming a cross-module feedback path.

[0053] In this embodiment, through the tenth resistor R10, effective information interaction can be carried out between the amplification and negative feedback control module 102 and the output filtering module 106. The output filtering module 106 can not only adjust based on the output signal of the amplification and negative feedback control module 102 transmitted by the tenth resistor R10 (for example, dynamically adjust parameters such as its own gain and filtering characteristics), but also feedback the adjusted result to the amplification and negative feedback control module 102. The amplification and negative feedback control module 102 can then make some adjustments according to the feedback, including dynamically adjusting the gain, improving the filtering characteristics, optimizing the feedback path, etc. For example, when the output filtering module 106 detects that the output voltage of the output regulation and dynamic feedback stabilization module 104 deviates from the expected value, the output filtering module 105 can adjust its own gain or filtering characteristics and transmit this adjustment information back to the amplification and negative feedback control module 102 through the tenth resistor R10. The amplification and negative feedback control module 102 can re-evaluate its own gain setting based on this information. Moreover, the adjustment of the amplification and negative feedback control module 102 will further affect the filtering and gain adjustment module 103 because the amplification and negative feedback control module 102 determines the quality and characteristics of the signal input to the filtering and gain adjustment module 103. In this way, the filtering and gain adjustment module 103 can adjust its own filtering and gain parameters based on a more optimized input signal. Similarly, the output regulation and dynamic feedback stabilization module 104 will be further affected by the adjustment of the filtering and gain adjustment module 103 to ensure that its own output signal is better.

[0054] Through the tenth resistor R10, a tightly cooperative feedback loop can be formed among the output filtering module 106, the amplification and negative feedback control module 102, the filtering and gain adjustment module 103, and the output regulation and dynamic feedback stabilization module 104, thereby enhancing the overall stability and reliability of the filtering circuit and ensuring a substantial improvement in the quality of the output signal of the filtering circuit.

[0055] In another exemplary embodiment, the output filtering module 106 includes a fourth operational amplifier U4, an eleventh resistor R11, and a fourth capacitor C4. Among them, the inverting input terminal of the fourth operational amplifier U4 serves as the first input terminal of the output filtering module 106, and the non-inverting input terminal serves as the second input terminal of the output filtering module 106; the first end of the eleventh resistor R11 is connected to the second end of the tenth resistor R10, the second end of the eleventh resistor R11 is connected to the output terminal of the fourth operational amplifier U4, the first end of the fourth capacitor C4 is connected to the output terminal of the fourth operational amplifier U4, and the second end of the fourth capacitor C4 serves as the output terminal OUT of the filtering circuit.

[0056] In this embodiment, the eleventh resistor R11 constitutes a negative feedback path from the output terminal to the input terminal of the fourth operational amplifier U4. Through this feedback path, any change that appears at the output terminal of the fourth operational amplifier U4 will be immediately fed back to its input terminal to help maintain the output voltage of the fourth operational amplifier U4 at a specific ratio.

[0057] In another embodiment, the voltage regulation and DC coupling module 107 includes: a fifth capacitor C5, a twelfth resistor R12, and a thirteenth resistor R13. Among them, the first end of the fifth capacitor C5 is connected to the fourth node N4, the second end of the fifth capacitor C5 is connected to the first ground terminal GND1, the first end of the thirteenth resistor R13 is connected to the fourth node N4, the second end of the thirteenth resistor R13 is connected to the positive pole of the 12V DC power supply, the first end of the twelfth resistor R12 is connected to the fourth node N4, and the second end of the twelfth resistor R12 is connected to the negative pole of the 12V DC power supply.

[0058] In this embodiment, the first end of the fifth capacitor C5 is connected to the fourth node N4, and the second end is grounded, so that the fifth capacitor C5 can act as a coupling capacitor, allowing the AC component in the output signal of the pre-stage module to be smoothly transmitted to the non-inverting input terminal of the fourth operational amplifier U4, while blocking any unnecessary DC component. In addition, by grounding, the fifth capacitor C5 can ensure that the non-inverting input terminal of the fourth operational amplifier U4 is not affected by the DC bias change of the pre-stage module, which helps the fourth operational amplifier U4 to always operate in the linear region, thereby improving the output stability and linearity of the fourth operational amplifier U4.

[0059] The twelfth resistor R12 and the thirteenth resistor R13 form a voltage dividing network, which can provide a stable DC bias voltage for the non-inverting input terminal of the fourth operational amplifier U4, ensure that the fourth operational amplifier U4 operates at a suitable DC operating point, thereby maintaining the output stability and linearity of the entire filter circuit, and reducing the influence of power supply noise.

[0060] The above are only the preferred embodiments of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the specification and drawings of the present application, or directly or indirectly applied to other related technical fields, shall be equally included in the patent protection scope of the present application.

Claims

1. A cloud box, characterized in that: The cloud box is provided with a TYPE-C port, and an isolation circuit, a filter circuit and a CPU are provided in the cloud box. The input end of the isolation circuit is electrically connected to the TYPE-C port, and the output end of the isolation circuit is connected to the CPU through the filter circuit; the isolation circuit includes: A first input protection module, a second input protection module, an isolation module and an output protection module, wherein: The first input protection module is used to provide anti-reverse connection protection; The second input protection module is used to provide overcurrent protection and electromagnetic interference suppression; The isolation module is used to provide electrical isolation between the external power supply and the filter circuit and the CPU; The output protection module is used to ensure the stability of the output voltage of the isolation circuit.

2. A cloud box according to claim 1, characterized in that: The first input protection module comprises: a first diode and a second diode, wherein The cathode of the first diode is connected to the ground pin of the TYPE-C port, the anode of the second diode is connected to the second positive pin of the TYPE-C port, and the anode of the first diode and the cathode of the second diode are commonly connected to the second ground terminal; The second input protection module comprises: A fuse, a common mode choke coil, a sixth capacitor and a seventh capacitor, wherein: The first end of the fuse is connected to the first positive pin of the TYPE-C port, and the second end of the fuse is connected to the first end of the common mode choke coil; The first end of the sixth capacitor is connected to the second end of the common mode choke coil, and the second end of the sixth capacitor is connected to the isolation module; The seventh capacitor is connected in parallel to both ends of the sixth capacitor.

3. A cloud box according to claim 2, characterized in that: The isolation module comprises: An isolated DC-DC converter, an eighth capacitor and a ninth capacitor, wherein: The input end of the isolated DC-DC converter is connected to the second end of the sixth capacitor; A first end of the eighth capacitor is connected to the output end of the isolated DC-DC converter, and a second end of the eighth capacitor is connected to the output protection module; The ninth capacitor is connected in parallel to both ends of the eighth capacitor.

4. A cloud box according to claim 3, characterized in that: The output protection module comprises: A voltage regulator, a fourteenth resistor and a fifteenth resistor, wherein: The input end of the voltage stabilizer is connected to the second end of the eighth capacitor, and the output end of the voltage stabilizer is connected to the filter circuit; A first end of the fourteenth resistor is connected to the output end of the voltage regulator, and a second end of the fourteenth resistor is connected to the third ground end via the fifteenth resistor.

5. A cloud box according to claim 4, characterized in that: The filtering circuit includes: an input protection and preliminary filtering module, an amplification and negative feedback control module, a filtering and gain adjustment module, an output regulation and dynamic feedback stabilization module, a feedback signal transmission module, an output filtering module and a voltage stabilization and DC coupling module, wherein: The input protection and preliminary filtering module is used to provide input protection for the CPU and perform preliminary filtering on the input signal entering from the TYPE-C port; The amplification and negative feedback control module is used to amplify the input signal after preliminary filtering and maintain the linearity of the input signal through negative feedback; The filtering and gain adjustment module is used to perform low-pass filtering on the amplified input signal and adjust the signal gain of the input signal; The output regulation and dynamic feedback stabilization module is used to finely regulate the input signal after low-pass filtering and maintain the stability of the filter circuit through dynamic feedback; The feedback signal transmission module is used to establish a feedback path between the output filtering module and the amplification and negative feedback control module; The output filter module is used to filter out high-frequency noise in the finely adjusted input signal; The voltage stabilization and DC coupling module is used to provide accurate voltage stabilization and ensure DC bias transmission.

6. A cloud box according to claim 5, characterized in that: The input protection and preliminary filtering module includes: a first capacitor and a first resistor, wherein, The first end of the first capacitor is connected to the output end of the voltage regulator, and the second end of the first capacitor is connected to the amplification and negative feedback control module via the first resistor.

7. A cloud box according to claim 6, characterized in that: The amplification and negative feedback control module comprises: a first operational amplifier, a second resistor, a third resistor, a fourth resistor, a fifth resistor and a sixth resistor, wherein: A first end of the second resistor is connected to an inverting input end of the first operational amplifier, and a second end of the second resistor is connected to an output end of the first operational amplifier to form a first node; The first end of the third resistor is connected to the first node, and the second end of the third resistor is connected to the first input end of the filtering and gain adjustment module via the fourth resistor; The first end of the fifth resistor is connected to the second end of the first resistor and is also connected to the non-inverting input end of the first operational amplifier, and the second end of the fifth resistor is connected to the second input end of the filtering and gain adjustment module; A first end of the sixth resistor is connected to the inverting input end of the first operational amplifier, and a second end of the sixth resistor is connected to the first input end of the output regulation and dynamic feedback stabilization module.

8. A cloud box according to claim 7, characterized in that: The filtering and gain adjustment module comprises: a second operational amplifier, a second capacitor, a seventh resistor and an eighth resistor, wherein: The first end of the second capacitor is connected to the inverting input end of the second operational amplifier and serves as the first input end of the filtering and gain adjustment module; The second end of the second capacitor is connected to the output end of the second operational amplifier to form a second node and the second node is used as the second input end of the filtering and gain adjustment module; The first end of the seventh resistor is connected to the second node, and the second end of the seventh resistor is connected to the first input end of the output regulation and dynamic feedback stabilization module via the eighth resistor; The in-phase input terminal of the second operational amplifier serves as the second input terminal of the filtering and gain adjustment module and is connected with the second input terminal of the output regulation and dynamic feedback stabilization module and the second input terminal of the output filtering module to form a fourth node.

9. A cloud box according to claim 8, characterized in that: The output regulation and dynamic feedback stabilization module includes: a third operational amplifier, a third capacitor and a ninth resistor, wherein: The first end of the third capacitor is connected to the inverting input end of the third operational amplifier and serves as the first input end of the output regulation and dynamic feedback stabilization module, and the second end of the third capacitor is connected to the output end of the third operational amplifier to form a third node; A first end of the ninth resistor is connected to the third node, and a second end of the ninth resistor is connected to the first input end of the output filter module; The non-inverting input terminal of the third operational amplifier serves as the second input terminal of the output regulation and dynamic feedback stabilization module.

10. A cloud box according to claim 9, characterized in that: The feedback signal transmission module comprises: The tenth resistor, where The first end of the tenth resistor is connected to the first node, and the second end of the tenth resistor is connected to the first input end of the output filter module.

11. A cloud box according to claim 10, characterized in that: The output filtering module comprises: a fourth operational amplifier, an eleventh resistor and a fourth capacitor, wherein: The inverting input terminal of the fourth operational amplifier serves as the first input terminal of the output filtering module, and the non-inverting input terminal serves as the second input terminal of the output filtering module; The first end of the eleventh resistor is connected to the second end of the tenth resistor, and the second end of the eleventh resistor is connected to the output end of the fourth operational amplifier; The first end of the fourth capacitor is connected to the output end of the fourth operational amplifier, and the second end of the fourth capacitor serves as the output end of the filter circuit.

12. A cloud box according to claim 11, characterized in that: The voltage stabilization and DC coupling module comprises: a fifth capacitor, a twelfth resistor and a thirteenth resistor, wherein: A first end of the fifth capacitor is connected to the fourth node, and a second end of the fifth capacitor is connected to the first ground terminal; A first end of the thirteenth resistor is connected to the fourth node, and a second end of the thirteenth resistor is connected to the positive electrode of a 12V DC power supply; A first end of the twelfth resistor is connected to the fourth node, and a second end of the twelfth resistor is connected to a negative electrode of a 12V DC power supply.

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