Signal processing system and electronic device

Abstract

The invention relates to the technical field of power supplies, in particular to a signal processing system and electronic equipment. The signal processing system comprises a filter circuit and a debugging circuit. The filter circuit comprises a filter module and a control module; the filtering module is used for generating a first suppression signal after receiving a noise signal generated by a noise source; the control module is used for evaluating a target elimination signal matched with the noise signal and dynamically analyzing an error with the target elimination signal to generate a second suppression signal, and the first suppression signal and the second suppression signal serve as noise suppression signals; and the debugging circuit is used for acquiring an error between the noise suppression signal and the target elimination signal and performing gain adjustment processing on the filter circuit. Through the above mode, the precision of suppressing the noise signal of the switching power supply module can be improved, and the noise suppression signal can be adaptively and dynamically adjusted based on the noise signal, so that the generalization of the signal processing system is improved.

Description

Technical Field

[0001] The present application relates to the field of power supply technology, and in particular to a signal processing system and an electronic device. Background Art

[0002] Switching power supply modules have the advantages of light weight, small size, high conversion efficiency and stable performance, so they are usually used as power supply units for edge devices. However, switching power supplies have the inherent characteristics of high-frequency switching during operation, which is usually accompanied by severe electromagnetic interference, and there is a risk of affecting the stability of the equipment.

[0003] To this end, passive filtering with passive components is usually adopted, using fixed inductors, capacitors, and resistors to filter noise in the switching power supply module. However, such a design can only suppress electromagnetic interference at a specific frequency, which is difficult to adapt to a wide range of needs, and requires the deployment of a large number of components such as inductors and capacitors. The filtering effect is highly dependent on the accuracy of the components, and it is easy to have unsatisfactory filtering effects. Summary of the invention

[0004] Based on this, it is necessary to provide a signal processing system and an electronic device to address the above technical problems, which can improve the accuracy of suppressing the noise signal of the switching power supply module, and can also adaptively and dynamically adjust the noise suppression signal based on the noise signal, thereby helping to improve the generalizability of the signal processing system.

[0005] On the one hand, a signal processing system is provided, the signal processing system includes: a filtering circuit and a debugging circuit; the filtering circuit includes a filtering module and a control module, and the filtering module and the control module are connected; the filtering module is used to generate a first suppression signal after receiving a noise signal generated by a noise source; the control module is used to evaluate a target elimination signal matching the noise signal after receiving the noise signal, and after receiving the first suppression signal, dynamically analyze the error between the first suppression signal and the target elimination signal to generate a second suppression signal, and the first suppression signal and the second suppression signal serve as noise suppression signals; the debugging circuit is connected to the filtering circuit, and is used to monitor the noise suppression signal, obtain the error between the noise suppression signal and the target elimination signal, so as to dynamically perform gain adjustment processing on the filtering circuit; wherein the filtering circuit and the debugging circuit are used to be connected between a switching power supply module as a noise source and a power supply device, and the power supply output by the power supply device is transmitted to the switching power supply module via the filtering circuit; the noise suppression signal is in opposite directions to the noise signal.

[0006] In one embodiment of the present application, the debugging circuit includes a debugging module; the debugging module is connected to the control module, and is used to receive and monitor the noise suppression signal fed back by the control module, and determine whether the noise suppression signal meets the target condition to determine whether to adjust the noise suppression signal; the adjustment accuracy of the noise suppression signal by the debugging module is higher than the accuracy of the control module; wherein the target condition includes at least one of the following: the noise suppression signal matches the target elimination signal, the noise suppression signal waveform is normal, and the noise suppression signal has continuity.

[0007] In one embodiment of the present application, the debugging module includes a calculation unit, a conversion unit and an adjustment unit; the conversion unit is connected to the control module, and is used to receive the noise suppression signal as an analog signal, convert it into a digital signal type, and then transmit it to the calculation unit; the calculation unit is connected to the conversion unit, and is used to receive the noise suppression signal of the digital signal type, perform conversion and output processing, and transmit the processed noise suppression signal to the adjustment unit; the adjustment unit is connected to the calculation unit, and is used to receive the processed noise suppression signal and monitor it, so as to adjust the gain of the filter circuit based on the error between the noise suppression signal and the target elimination signal.

[0008] In one embodiment of the present application, the debugging circuit includes an impedance stabilization module; the impedance stabilization module is connected to the filtering circuit, and is used to connect the filtering circuit to the power supply device through the impedance stabilization module, filter the electric energy input by the power supply device to the signal processing system, and provide test impedance.

[0009] In one embodiment of the present application, the filtering module includes: a sensing unit, a first compensation unit, a second compensation unit and an injection unit; the sensing unit is used to obtain a noise signal and capture the dynamic changes of the noise signal; one end of the first compensation unit is connected to the sensing unit and the input end of the control module, and the other end is connected to the injection unit and the control module; one end of the second compensation unit is connected to the noise source and the injection unit, and the other end of the second compensation unit is connected to the noise source and the control module; the first compensation unit, the second compensation unit and the injection unit generate a first suppression signal.

[0010] In one embodiment of the present application, the sensing unit includes a sensing capacitor, one end of which is connected to the power supply device and the noise source, and the other end of the sensing capacitor is connected to the first compensation unit and the control module; and / or, the first compensation unit includes a first compensation resistor and a first compensation capacitor, one end of the first compensation resistor is connected to the sensing capacitor and the control module, the other end of the first compensation resistor is connected to one end of the first compensation capacitor, and the other end of the first compensation capacitor is connected to the injection unit and the output end of the control module; and / or, the second compensation unit includes a second compensation capacitor and a second compensation resistor, one end of the second compensation capacitor is connected to the power supply device, the injection unit and the noise source, the other end of the second compensation capacitor is connected to one end of the second compensation resistor, and the other end of the second compensation resistor is connected to the power supply end of the control module, the noise source and the power supply device; and / or, the injection unit includes an injection capacitor, one end of the injection capacitor is connected to the power supply device and the noise source, and the other end of the injection capacitor is connected to the first compensation unit and the output end of the control module.

[0011] In one embodiment of the present application, the control module includes an operational amplifier; the operational amplifier includes an inverting input terminal, a non-inverting input terminal, an output terminal, a positive power supply terminal and a negative power supply terminal; the inverting input terminal is connected to the sensing unit and the first compensation unit; the non-inverting input terminal is grounded or connected to a preset input source to adjust the operational amplifier; the output terminal is connected to the injection unit and the first compensation unit; the positive power supply terminal is used to input the supply voltage; the negative power supply terminal is connected to the power supply device, the second compensation unit and the noise source.

[0012] In one embodiment of the present application, the filtering circuit also includes an adjusting resistor, one end of which is connected to the first compensation unit and the inverting input terminal of the operational amplifier, and the other end of which is connected to the first compensation unit and the output terminal of the operational amplifier, for adjusting the amplification factor of the operational amplifier.

[0013] In one embodiment of the present application, the filtering circuit includes a differential mode filtering circuit and a common mode filtering circuit, the differential mode filtering circuit is connected to the noise source through the common mode filtering circuit; the differential mode filtering circuit includes a filtering module and a control module; the common mode filtering circuit includes a common mode filtering element, which is used to generate a preliminary filtering signal for suppressing the common mode noise signal in the noise signal after receiving the noise signal; the differential mode filtering circuit is used to generate a noise suppression signal for suppressing the differential mode noise signal in the noise signal after receiving the noise signal superimposed with the preliminary filtering signal; wherein the frequency of the common mode noise signal is higher than the differential mode noise signal.

[0014] On the other hand, an electronic device is provided, comprising: a device body and a signal processing system as in any one of the above embodiments; the device body comprises a switching power supply module, the switching power supply module is used to generate a power control signal; the signal processing system is arranged in the device body, connected to the switching power supply module, and is used to obtain the power control signal and generate a noise suppression signal for suppressing the noise signal in the power control signal.

[0015] The above-mentioned signal processing system and electronic device, the filtering circuit includes a filtering module and a control module, the control module can monitor the first suppression signal generated by the filtering module, and dynamically generate a second suppression signal based on the error between the first suppression signal and the target elimination signal, so as to use the second suppression signal to dynamically compensate for the insufficiency or excess of attenuation of the noise signal, etc., to achieve active filtering of the noise signal, and can improve the accuracy of the noise suppression signal. The present application is designed so that when the noise signal obtained by the signal processing system changes, the control module can also dynamically adjust the second suppression signal output by the change of the noise signal to dynamically adapt to the change of the noise signal, thereby helping to improve the generalizability of the signal processing system. In addition, the filter circuit is further dynamically gain-adjusted by the debugging circuit to achieve fine-tuning of the noise suppression signal, further improve the accuracy of the noise suppression signal, and thus significantly improve the noise suppression effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural diagram of an embodiment of a signal processing system of the present application;

[0017] Figure 2 It is a structural schematic diagram of an embodiment of the filter circuit of the present application;

[0018] Figure 3 It is a structural diagram of an embodiment of a filtering module of the present application;

[0019] Figure 4 yes Figure 2 The structural schematic diagram of an embodiment of the filter circuit refinement components shown;

[0020] Figure 5 is a structural schematic diagram of another embodiment of the filtering module of the present application;

[0021] Figure 6 It is a structural diagram of an embodiment of a debugging circuit of the present application;

[0022] Figure 7 is a structural schematic diagram of another embodiment of the signal processing system of the present application;

[0023] Figure 8 It is a structural schematic diagram of another embodiment of the signal processing system of the present application;

[0024] Fig. 9 It is a structural schematic diagram of an embodiment of the electronic device of the present application. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0026] In the "cloud" architecture, "end" products usually refer to the devices or services at the front end of the architecture. "End" products can be responsible for data collection, preliminary processing, and interaction with users. These "end" products are widely distributed in various scenarios, including but not limited to IoT devices, mobile devices, smart home appliances, sensors, cameras, etc.

[0027] With the development of the electronic information industry, various devices are gradually developing towards high integration, miniaturization and intelligence. As an important part of the electronic information industry, mobile communication technology equipment also shows a trend of high integration, miniaturization and intelligence, and has more stringent requirements for its stability and adaptability to electromagnetic environments. In order to achieve the new features and harsh environmental adaptability of mobile communication technology edge products, the power supply unit as its "energy heart" needs to have stable, reliable, safe and efficient performance. Therefore, AC-DC (alternating current-direct current) switching power supply is widely used in mobile communication technology products due to its advantages of light weight, small size, high conversion efficiency and stable performance; however, the inherent characteristics of the switching power supply, that is, the high-frequency on-off characteristics during operation, will produce serious electromagnetic interference (EMI, Electromagnetic Interference). If it is not controlled, it is very likely to affect the surrounding electromagnetic environment and the stability of the mobile communication technology equipment system, and may even cause serious consequences, such as reducing the reliability of the mobile communication technology equipment system and affecting the stability of the power grid and adjacent equipment.

[0028] In order to solve the technical problem that the noise attenuation effect of the switching power supply module in the related art is not ideal, the present application provides a signal processing system and an electronic device. The signal processing system includes a filtering circuit and a debugging circuit; the filtering circuit includes a filtering module and a control module, and the filtering module and the control module are connected; the filtering module is used to generate a first suppression signal after receiving the noise signal generated by the noise source; the control module is used to evaluate the target elimination signal matching the noise signal after receiving the noise signal, and after receiving the first suppression signal, dynamically analyze the error between the first suppression signal and the target elimination signal to generate a second suppression signal, and the first suppression signal and the second suppression signal are used as noise suppression signals; the debugging circuit is connected to the filtering circuit, and is used to monitor the noise suppression signal, obtain the error between the noise suppression signal and the target elimination signal, so as to dynamically perform gain adjustment processing on the filtering circuit; wherein the filtering circuit and the debugging circuit are used to connect between the switching power supply module as the noise source and the power supply device, and the power supply output by the power supply device is transmitted to the switching power supply module through the filtering circuit; the noise suppression signal is in the opposite direction to the noise signal. The specific structure and working principle of the present application are described in detail below.

[0029] See also Figure 1 , Figure 1 It is a structural diagram of an embodiment of a signal processing system of the present application.

[0030] In one embodiment, the signal processing system may include a filtering circuit 11 and a debugging circuit 12 .

[0031] The filter circuit 11 and the debugging circuit 12 are used to be connected between the switching power supply module 20 and the power supply device 30 as noise sources, and the power supply output by the power supply device 30 is transmitted to the switching power supply module 20 through the filter circuit 11. The filter circuit 11 can form a noise suppression signal to dynamically suppress the noise signal generated by the switching power supply module 20. Optionally, the noise suppression signal can be opposite to the direction of the noise signal.

[0032] In detail, the filter circuit 11 may include a filter module 111 and a control module 112. The filter module 111 and the control module 112 may be connected.

[0033] As the name implies, the filter module 111 can filter the noise signal. Optionally, in this embodiment, the filter module 111 may include passive components such as resistors and capacitors to filter the noise signal at a certain frequency. That is, the filter module 111 is used to generate a first suppression signal after receiving the noise signal generated by the noise source.

[0034] The control module 112 is used to evaluate the target cancellation signal matching the noise signal after receiving the noise signal, and dynamically analyze the error between the first suppression signal and the target cancellation signal to generate a second suppression signal after receiving the first suppression signal. The first suppression signal and the second suppression signal serve as noise suppression signals.

[0035] Ideally, it is hoped that the noise suppression signal can completely cancel the noise signal, that is, ideally, the target elimination signal can be a signal with the same size as the noise signal and opposite direction to the noise signal, so as to completely attenuate the noise signal. In this embodiment, the target elimination signal can be an ideal suppression signal, or a signal that allows a certain amount of floating to match the noise signal, which is not strictly limited here. In addition, when dynamically evaluating the target elimination signal and generating the second suppression signal based on the error, an independent step can be performed to evaluate the target elimination signal, or the error evaluation can be performed directly based on the noise signal, which is also not strictly limited here.

[0036] The debugging circuit 12 may be connected to the filtering circuit 11 .

[0037] The debugging circuit 12 is used to monitor the noise suppression signal and obtain the error between the noise suppression signal and the target elimination signal so as to dynamically perform gain adjustment processing on the filter circuit 11, thereby realizing the dynamic change of the noise suppression signal, so as to improve the accuracy of the noise suppression signal in attenuating the noise signal, and can also dynamically adapt to the change of the noise signal.

[0038] That is to say, in this embodiment, the control module 112 can monitor the first suppression signal generated by the filter module 111, and dynamically generate the second suppression signal based on the error between the first suppression signal and the target elimination signal. That is, the first suppression signal and the second suppression signal form a noise suppression signal that suppresses the noise signal of the switching power supply module 20, so as to use the second suppression signal to dynamically compensate for the insufficiency or excess of the attenuated noise signal, etc., to achieve active filtering of the noise signal, and to improve the accuracy of the noise suppression signal. The present application is designed as such, when the noise signal acquired by the signal processing system changes, the control module 112 can dynamically adjust the second suppression signal output by the change of the noise signal to dynamically adapt to the change of the noise signal, thereby facilitating the generalization of the signal processing system, that is, it can widen the range of the noise signal that the signal processing system adapts to the attenuation, so as to enrich the application scenarios of the signal processing system. In addition, the filter circuit 11 is further dynamically gain-adjusted based on the error between the noise suppression signal and the target elimination signal by the debugging circuit 12, so as to achieve fine-tuning of the noise suppression signal, further improve the accuracy of the noise suppression signal, and thus significantly improve the noise suppression effect.

[0039] In other words, the filter circuit 11 in this embodiment is an active filter circuit, which can effectively suppress noise through the combination of electronic components, and is also conducive to reducing volume, weight and loss, and promoting the development of miniaturization design. Moreover, it can also be dynamically adjusted as needed to adapt to different noise environments and load conditions.

[0040] Please refer to Figures 1 to 4 , Figure 2 is a schematic diagram of the structure of an embodiment of the filter circuit 11 of the present application, Figure 3 is a schematic diagram of the structure of an embodiment of the filtering module 111 of the present application, Figure 4 yes Figure 2 The filter circuit 11 is a schematic structural diagram of an embodiment of detailed components.

[0041] In one embodiment, the filtering module 111 may include at least one of a sensing unit 1111 , a first compensation unit 1112 , a second compensation unit 1113 , and an injection unit 1114 .

[0042] The sensing unit 1111 is used to obtain the noise signal and capture the dynamic changes of the noise signal. In other words, the sensing unit 1111 can detect the noise current of the switching power supply module 20, wherein the noise current may include differential mode noise and common mode noise, etc. The sensing unit 1111 can accurately capture the changes of the noise current and reduce the interference to the normal operation of the signal processing system and even the electronic device circuit.

[0043] Optionally, the sensing unit 1111 may include a sensing capacitor Csense.

[0044] One end of the sensing capacitor Csense is connected to the power supply device 30 and the noise source, and the other end of the sensing capacitor Csense is connected to the first compensation unit 1112 and the control module 112 .

[0045] The first compensation unit 1112 , the second compensation unit 1113 , and the injection unit 1114 generate a first suppression signal.

[0046] The first compensation unit 1112 and the second compensation unit 1113 together form a compensation network, which can ensure the stability of the filter circuit 11. In addition, the compensation network including the first compensation unit 1112 and the second compensation unit 1113 in this embodiment can be flexibly calculated and debugged accurately according to circuit characteristics and requirements, thereby facilitating the circuit to have good adaptability so as to be able to operate relatively stably under various working conditions.

[0047] One end of the first compensation unit 1112 is connected to the sensing unit 1111 and the input end of the control module 112 , and the other end is connected to the injection unit 1114 and the control module 112 .

[0048] Optionally, the first compensation unit 1112 may include a first compensation resistor Rcomp0 and a first compensation capacitor Ccomp0.

[0049] One end of the first compensation resistor Rcomp0 is connected to the sensing capacitor Csense and the control module 112 , the other end of the first compensation resistor Rcomp0 is connected to one end of the first compensation capacitor Ccomp0 , and the other end of the first compensation capacitor Ccomp0 is connected to the injection unit 1114 and the output end of the control module 112 .

[0050] Furthermore, one end of the second compensation unit 1113 is connected to the noise source and the injection unit 1114 , and the other end of the second compensation unit 1113 is connected to the noise source and the control module 112 .

[0051] Optionally, the second compensation unit 1113 may include a second compensation capacitor Ccomp1 and a second compensation resistor Rcomp1.

[0052] One end of the second compensation capacitor Ccomp1 is connected to the power supply device 30, the injection unit 1114 and the noise source, the other end of the second compensation capacitor Ccomp1 is connected to one end of the second compensation resistor Rcomp1, and the other end of the second compensation resistor Rcomp1 is connected to the power supply end of the control module 112, the noise source and the power supply device 30.

[0053] Furthermore, the injection unit 1114 is used to cooperate in generating a cancellation signal. That is, through units such as and related circuit components, a noise suppression signal matching the noise signal can be generated so that the noise suppression signal and the noise signal cancel each other out on the power supply side of the power supply device 30, thereby effectively suppressing the noise.

[0054] Optionally, the injection unit 1114 may include an injection capacitor Cini.

[0055] One end of the injection capacitor Cini is connected to the power supply device 30 and the noise source, and the other end of the injection capacitor Cini is connected to the first compensation unit 1112 and the output end of the control module 112 .

[0056] In an alternative embodiment, the filter circuit 11 may also include other types of switching power supply compensation networks, etc. Alternatively, it may also include other components, which will not be described in detail here.

[0057] Please continue reading Figures 1 to 4In one embodiment, the control module 112 may include an operational amplifier U1A.

[0058] Specifically, the operational amplifier U1A includes an inverting input terminal, a non-inverting input terminal, an output terminal, a positive power supply terminal, and a negative power supply terminal.

[0059] The inverting input terminal is connected to the sensing unit 1111 and the first compensation unit 1112 .

[0060] The non-inverting input is connected to ground or to a preset input source to regulate the operational amplifier U1A.

[0061] The output end is connected to the injection unit 1114 and the first compensation unit 1112 .

[0062] The positive power supply terminal is used to input the power supply voltage VCC; the negative power supply terminal is connected to the power supply device 30, the second compensation unit 1113 and the noise source.

[0063] Compared to high-density computing devices such as complex programmable logic controllers, complex programmable logic controllers, and microcontrollers, in this embodiment, the second suppression signal can be dynamically generated through the operational amplifier U1A, so that the noise suppression signal can dynamically adapt to the noise signal, which can further rationally allocate the computing resources of the signal processing system, simplify the implementation architecture of the signal processing system, and at the same time help to reduce complex logic design and reduce the cost of the signal processing system.

[0064] Furthermore, the filter circuit 11 may also include an adjusting resistor R1.

[0065] One end of the adjusting resistor R1 is connected to the first compensation unit 1112 and the inverting input end of the operational amplifier U1A, and the other end of the adjusting resistor R1 is connected to the first compensation unit 1112 and the output end of the operational amplifier U1A. In this embodiment, the adjusting resistor R1 can adjust the gain of the operational amplifier U1A, further simplifying the signal processing system, making the signal processing system easy to implement, and improving the flexibility of the signal processing system.

[0066] in, Figure 4 In the figure, ZL is used to represent a power supply device 30 such as a public power grid, and Zs and Vs are used to represent a switching power supply module 20.

[0067] For further information, please refer to Figure 1 and Figure 5 , Figure 5 It is a structural diagram of another embodiment of the filter circuit 11 of the present application.

[0068] In one embodiment, the signal processing system may further include a current transformer 113 .

[0069] The current transformer 113 is arranged in the connection link between the control module 112 and the noise source and the power supply device 30, so that the control module 112 can be connected to the noise source and the power supply device 30 through the current transformer 113. The current transformer 113 can attenuate the noise signal, that is, the current transformer 113 can reduce the measured current output by the noise source. For example, the current transformer 113 can reduce the current by a ratio such as 60:1, 50:1, 30:1, etc. When the measured current passes through the primary winding of the current transformer 113, an induced current is induced in the secondary winding of the current transformer 113. The ratio between the induced current and the measured current is the transformation ratio, so that the control module 112 measures the magnitude of the induced current, and the current value of the measured current can be known by combining the measured current value and the transformation ratio. Figure 5 As shown in the example, the noise signal generated by the noise source is the signal in, which is attenuated by the current transformer 113 to obtain the induced current ic, and the induced current ic is input to the control module 112 to enable the filter circuit 11 to generate the noise suppression signal is.

[0070] Furthermore, a voltage suppressor 114 may be provided between the current transformer 113 and the control module 112. That is, the control module 112 is connected to the current transformer 113 via the voltage suppressor 114. The voltage suppressor 114 can reduce the impact of transient voltage, current, etc. on the control module 112, thereby reducing the impact of the attenuated measured current on the noise signal, which is further conducive to ensuring the matching degree between the generated noise suppression signal and the noise signal.

[0071] For example, the voltage suppressor 114 may be a surge protection transient voltage suppressor 114 such as a TVS (transient voltage suppressor) to further simplify the structure of the signal processing system.

[0072] Please refer to Figure 1 , Figures 6 to 8 , Figure 6 is a schematic diagram of the structure of an embodiment of the debugging circuit 12 of the present application, Figure 7 is a structural diagram of another embodiment of the signal processing system of the present application, Figure 8 It is a structural diagram of another embodiment of the signal processing system of the present application.

[0073] In one embodiment, the debugging circuit 12 may include an impedance stabilization module 121 .

[0074] The impedance stabilization module 121 is connected to the filter circuit 11 , and is used to connect the filter circuit 11 to the power supply device 30 through the impedance stabilization module 121 , filter the electric energy input from the power supply device 30 to the signal processing system, and provide test impedance.

[0075] That is to say, the impedance stabilization module 121 can isolate the noise signal of the power supply device 30 such as the public power grid, and provide a reliable and stable test impedance for the testing and evaluation of the noise suppression signal, which is beneficial to improve the measurement accuracy of the noise suppression signal, and further helps to improve the reliability of the debugging circuit 12 controlling the gain adjustment of the filter module 111, so as to effectively suppress the noise signal.

[0076] For example, the impedance stabilization module 121 may be a line impedance stabilization network (LISN), etc. The impedance stabilization network is connected to the live line (L) and the neutral line (N) of the utility grid.

[0077] Optionally, the debugging circuit 12 may include a debugging module.

[0078] The debugging module is connected to the control module 112, and is used to receive and monitor the noise suppression signal fed back by the control module 112, to determine whether the noise suppression signal meets the target conditions, so as to determine whether to adjust the noise suppression signal; the adjustment accuracy of the noise suppression signal by the debugging module is higher than that of the control module 112.

[0079] The target condition includes at least one of the following: the noise suppression signal matches the target elimination signal, the noise suppression signal waveform is normal, and the noise suppression signal has continuity.

[0080] That is to say, in this embodiment, a noise suppression signal matching the noise signal is formed by the filter circuit 11, and the noise suppression signal is further fine-tuned by the debugging module. The fine-tuning process means that on the basis of the generated noise suppression signal, the gain of the filter circuit 11 is further adjusted according to the stability of the noise suppression signal itself, the error between the noise suppression signal and the noise signal, etc., so that the noise suppression signal can better match the noise signal, and / or the signal performance of the noise suppression signal such as stability and continuity can be improved.

[0081] Furthermore, the debugging module may include a calculation unit 122 , a conversion unit 123 and an adjustment unit 124 .

[0082] The conversion unit 123 is connected to the control module 112 , and is used for receiving the noise suppression signal which is an analog signal, converting it into a digital signal type, and then transmitting it to the calculation unit 122 .

[0083] The calculation unit 122 is connected to the conversion unit 123 , and is used for receiving the noise suppression signal of the digital signal type, performing conversion and output processing, and transmitting the processed noise suppression signal to the adjustment unit 124 .

[0084] The adjustment unit 124 is connected to the calculation unit 122 and is used to receive the processed noise suppression signal and monitor it to adjust the gain of the filter circuit 11 based on the error between the noise suppression signal and the target cancellation signal.

[0085] The control module 112 digitizes the current signal (i.e., the noise suppression signal is) detected by the feedback through an analog-to-digital converter such as an isolated analog-to-digital conversion circuit, and the digitized current signal is transmitted to the MCU (Microcontroller Unit) for conversion and processing, and then uploaded to the host computer. The adjustment unit 124 can be set in the host computer to display and monitor, and the host computer software can adjust the gain of the active filter as needed to achieve accurate suppression of noise, so as to significantly improve the debugging efficiency and accuracy of the circuit through the visual debugging function.

[0086] Please continue to refer to Figure 1 as well as Figure 7 In one embodiment, the filter circuit 11 may include a differential mode filter circuit 11a filter circuit 11 and a common mode filter circuit 11b filter circuit 11.

[0087] The differential mode filter circuit 11a and the filter circuit 11 are connected to a noise source through the common mode filter circuit 11b.

[0088] Differential Mode Filter Circuit 11 a The filter circuit 11 includes a filter module 111 and a control module 112 .

[0089] Common mode filter circuit 11b The filter circuit 11 includes a common mode filter element, which is used to generate a preliminary filter signal for suppressing the common mode noise signal in the noise signal after receiving the noise signal.

[0090] The differential mode filter circuit 11a is used for receiving the noise signal superimposed with the preliminary filter signal, and generating a noise suppression signal for suppressing the differential mode noise signal in the noise signal.

[0091] Among them, the frequency of the common mode noise signal is higher than that of the differential mode noise signal.

[0092] Differential mode noise signals are usually noises that exist between the live wire and the neutral wire, and are usually caused by switching actions inside the power supply, load changes, etc. Common mode noise signals are usually noises that exist between the power line (live wire or neutral wire) and the ground line (GND), and are usually caused by external magnetic field interference, poor grounding, and other factors.

[0093] That is to say, in this embodiment, the signal processing system can combine the active filter power supply and the passive filter circuit, use the active filter circuit to filter the differential mode noise signal, and use the passive filter circuit to filter the common mode noise signal. In addition, in this embodiment, considering that the common mode noise signal mainly belongs to the high frequency band, in order to enhance the common mode noise suppression effect, a discrete common mode inductor and a Y capacitor (safety capacitor) are added, and the volume is still within a relatively small range, and the risk of loss current is small.

[0094] Furthermore, conducted emission (CE) tests can be performed in the shielded room to improve the accuracy of obtaining differential mode active filtering and common mode passive filtering results. In addition, the noise current before and after the signal processing system (equivalent to the EMI filter) can be tested by current calipers in the shielded room to compare the actual effect of adding the signal processing system.

[0095] That is to say, the signal processing system in the above embodiment can be used to test EMI filters, reduce the repeated verification time of electromagnetic compatibility (EMC) tests, and reduce the risks caused by EMC test failures. The active filter circuit parameters can be visually adjusted through the host computer, which is conducive to improving the filtering accuracy. In addition, the signal processing system can also be applied to actual electronic devices such as mobile communication technology terminal equipment.

[0096] See also Fig. 9 , Fig. 9 It is a structural schematic diagram of an embodiment of the electronic device of the present application.

[0097] In one embodiment, the electronic device may include a device body 41 and a signal processing system 42 .

[0098] The device body 41 may include a switching power module 20 , and the switching power module 20 is used to generate a power control signal.

[0099] The signal processing system 42 may be disposed in the device body 41 and connected to the switching power module 20 , and is used to obtain a power control signal and generate a noise suppression signal for suppressing a noise signal in the power control signal.

[0100] It can be seen that the signal processing system 42 in this embodiment can improve the accuracy of suppressing the noise signal of the switching power supply module 20, and can also adaptively and dynamically adjust the noise suppression signal based on the noise signal, thereby facilitating the improvement of the generalizability of the signal processing system 42. As such, thanks to the accuracy and generalizability of the signal processing system 42, the electronic device including the signal processing system 42 can have a good electromagnetic environment, thereby facilitating the stability of the electronic device and giving full play to the performance of the electronic device.

[0101] It should be noted that although Fig. 9The signal processing system 42 shown as an example is disposed inside the device body 41, but in an alternative embodiment, the signal processing system 42 may also be an independent device / apparatus, etc., which can be independently connected between the device body 41 and the public power grid, or part of the signal processing system 42 such as the filter circuit 11 is disposed in the device body 41, while part of the signal processing system 42 such as the impedance stabilization module 121 and the adjustment unit 124 is disposed outside the device body 41, which is not limited here.

[0102] For the specific definition of the signal processing system, please refer to the definition of the signal processing system above, which will not be repeated here. Each module in the above signal processing system can be implemented in whole or in part by software, hardware and a combination thereof. The above modules can be embedded in or independent of the processor in the computer device in the form of hardware, or can be stored in the memory in the computer device in the form of software, so that the processor can call and execute the operations corresponding to the above modules.

[0103] The following is a further detailed description of the defects in the related technology. In the related technology, passive filtering is performed using passive components such as inductors, capacitors, and resistors. Passive filtering circuits can usually only suppress electromagnetic interference within a specific frequency range. As the operating frequency of electronic equipment continues to increase, the frequency range of electromagnetic interference continues to expand, which makes the filtering effect of passive filters may not meet the ever-changing needs and have poor adaptability.

[0104] In addition, the passive filtering circuit uses inductors, capacitors and other components to form a filtering network. The accuracy and stability of these components will directly affect the filtering effect of the filter. In practical applications, due to the changes in component parameters and the influence of distributed parameters, the filtering accuracy of the filter may not be able to reach the ideal state, and may even lead to poor filtering effects.

[0105] At the same time, in order to achieve effective filtering effects, passive filter circuits usually require larger inductors, capacitors and other components, resulting in a larger passive filter circuit size, occupying a large amount of space and running counter to the goal of miniaturization. In addition, due to the use of a large number of inductors, capacitors and other components, the weight of the passive filter is also relatively heavy, which is also not conducive to the miniaturization and lightweight development of electronic equipment.

[0106] Moreover, because filtering can only be achieved with a large number of components such as inductors and capacitors, the debugging process of passive filtering circuits is relatively complicated, and it is necessary to accurately measure and adjust the parameters of the filter to ensure that its filtering effect meets the requirements, which is tantamount to increasing the difficulty and time cost of production debugging. Once the passive filtering circuit fails or its performance deteriorates, due to the complexity of its internal structure, repair and replacement may also be very difficult, seriously increasing the maintenance cost and time of the equipment.

[0107] The present application can effectively overcome the above-mentioned problems through the signal processing system described in the foregoing text, thereby being beneficial in having a good noise suppression effect while also being beneficial in ensuring the stability of electronic equipment and reliable adaptability to electromagnetic environments.

[0108] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiments can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to memory, storage, database or other media used in the embodiments provided in the present application can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0109] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0110] The embodiments described above only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application.

Claims

1. A signal processing system, characterized in that: The signal processing system comprises: A filtering circuit comprises a filtering module and a control module, wherein the filtering module and the control module are connected; the filtering module is used to generate a first suppression signal after receiving a noise signal generated by a noise source; the control module is used to evaluate a target elimination signal matching the noise signal after receiving the noise signal, and after receiving the first suppression signal, dynamically analyze an error between the first suppression signal and the target elimination signal to generate a second suppression signal, wherein the first suppression signal and the second suppression signal serve as noise suppression signals; A debugging circuit, connected to the filter circuit, for monitoring the noise suppression signal, obtaining an error between the noise suppression signal and the target elimination signal, so as to dynamically perform gain adjustment processing on the filter circuit; The filtering circuit and the debugging circuit are used to be connected between a switching power supply module and a power supply device as noise sources. The power supply output by the power supply device is transmitted to the switching power supply module via the filtering circuit. The direction of the noise suppression signal is opposite to that of the noise signal.

2. The signal processing system according to claim 1, characterized in that The debugging circuit includes a debugging module; The debugging module is connected to the control module, and is used to receive and monitor the noise suppression signal fed back by the control module, and judge whether the noise suppression signal meets the target condition, so as to determine whether to adjust the noise suppression signal; the adjustment accuracy of the noise suppression signal by the debugging module is higher than the accuracy of the control module; The target condition includes at least one of the following: the noise suppression signal matches the target elimination signal, the noise suppression signal waveform is normal, and the noise suppression signal has continuity.

3. The signal processing system according to claim 2, characterized in that The debugging module includes a calculation unit, a conversion unit and an adjustment unit; The conversion unit is connected to the control module, and is used for receiving the noise suppression signal which is an analog signal, converting it into a digital signal type, and then transmitting it to the calculation unit; The calculation unit is connected to the conversion unit, and is used to receive the noise suppression signal of the digital signal type, perform conversion and output processing, and transmit the processed noise suppression signal to the adjustment unit; The adjustment unit is connected to the calculation unit and is configured to receive the processed noise suppression signal and monitor it to adjust the gain of the filter circuit based on an error between the noise suppression signal and a target cancellation signal.

4. The signal processing system according to claim 1 or 2, characterized in that: The debugging circuit includes an impedance stabilization module; The impedance stabilization module is connected to the filter circuit, and is used to connect the filter circuit to the power supply device through the impedance stabilization module, filter the electric energy input from the power supply device to the signal processing system, and provide test impedance.

5. The signal processing system according to claim 1, characterized in that: The filtering module includes: a sensing unit, a first compensation unit, a second compensation unit and an injection unit; The sensing unit is used to obtain the noise signal and capture the dynamic changes of the noise signal; One end of the first compensation unit is connected to the sensing unit and the input end of the control module, and the other end is connected to the injection unit and the control module; One end of the second compensation unit is connected to the noise source and the injection unit, and the other end of the second compensation unit is connected to the noise source and the control module; The first compensation unit, the second compensation unit, and the injection unit generate the first suppression signal.

6. The signal processing system according to claim 5, characterized in that The sensing unit includes a sensing capacitor, one end of which is connected to the power supply device and the noise source, and the other end of which is connected to the first compensation unit and the control module; and / or, The first compensation unit includes a first compensation resistor and a first compensation capacitor, one end of the first compensation resistor is connected to the sensing capacitor and the control module, the other end of the first compensation resistor is connected to one end of the first compensation capacitor, and the other end of the first compensation capacitor is connected to the injection unit and the output end of the control module; and / or, The second compensation unit includes a second compensation capacitor and a second compensation resistor, one end of the second compensation capacitor is connected to the power supply device, the injection unit and the noise source, the other end of the second compensation capacitor is connected to one end of the second compensation resistor, and the other end of the second compensation resistor is connected to the power supply end of the control module, the noise source and the power supply device; and / or, The injection unit includes an injection capacitor, one end of the injection capacitor is connected to the power supply device and the noise source, and the other end of the injection capacitor is connected to the first compensation unit and the output end of the control module.

7. The signal processing system according to claim 5, characterized in that The control module includes an operational amplifier; The operational amplifier comprises an inverting input terminal, a non-inverting input terminal, an output terminal, a positive power supply terminal and a negative power supply terminal; The inverting input terminal is connected to the sensing unit and the first compensation unit; The non-inverting input terminal is grounded or connected to a preset input source to adjust the operational amplifier; The output end is connected to the injection unit and the first compensation unit; The positive power supply terminal is used to input the power supply voltage; The negative power supply terminal is connected to the power supply device, the second compensation unit and the noise source.

8. The signal processing system according to claim 7, characterized in that: The filtering circuit also includes an adjusting resistor, one end of which is connected to the first compensation unit and the inverting input end of the operational amplifier, and the other end of which is connected to the first compensation unit and the output end of the operational amplifier, for adjusting the amplification factor of the operational amplifier.

9. The signal processing system according to claim 1, characterized in that: The filter circuit includes a differential mode filter circuit and a common mode filter circuit, and the differential mode filter circuit is connected to the noise source through the common mode filter circuit; The differential mode filtering circuit includes the filtering module and the control module; The common mode filtering circuit includes a common mode filtering element, which is used to generate a preliminary filtering signal to suppress the common mode noise signal in the noise signal after receiving the noise signal; The differential mode filtering circuit is used to generate the noise suppression signal for suppressing the differential mode noise signal in the noise signal after receiving the noise signal superimposed with the preliminary filtering signal; The frequency of the common mode noise signal is higher than that of the differential mode noise signal.

10. An electronic device, characterized in that: The electronic device comprises: The device body includes a switching power supply module, wherein the switching power supply module is used to generate a power control signal; The signal processing system according to any one of claims 1 to 9 is arranged in the device body and connected to the switching power supply module, and is used to obtain the power control signal and generate the noise suppression signal for suppressing the noise signal in the power control signal.

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