Bidirectional current detection method of POWER tube

Abstract

The invention relates to the technical field of current signal processing, and discloses a bidirectional current detection method for a POWER tube, and the method comprises the steps: carrying out the signal processing of a bidirectional current signal of the POWER tube through a POWER detection part and a common-mode component current conversion unit, and obtaining a POWER detection signal and a common-mode component signal; a POWER detection signal is processed through a detection signal processing module to obtain a conversion current signal, the conversion current signal and a common-mode component signal are subjected to differential synthesis through a differential current synthesis unit to generate a feedback current signal, and the feedback current signal is transmitted to an external resistor Rext to generate a mapping voltage signal. According to the method, the bidirectional current signal of the POWER tube can be accurately detected, the voltage signal in proportion to the intensity of the current signal is generated, the accuracy and stability of the signal are improved through differential synthesis processing, intensity display of the current signal of the POWER tube is achieved, and the problem that in the prior art, the cost is high due to the fact that an external resistor is adopted for detecting a circuit is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of current signal processing, and in particular to a bidirectional current detection method for a POWER tube. Background Art

[0002] In the field of power electronics, accurate current detection and control are crucial to the performance and safe operation of equipment. In the existing technology, the current detection of motors generally adopts the external resistor method. Other similar on-chip detection is not easy to make corresponding detection output. The external resistor method has a corresponding high application cost. Other detections can only perform overcurrent protection due to insufficient accuracy and are not easy to give a flag output. Summary of the invention

[0003] The purpose of the present invention is to provide a bidirectional current detection method for a POWER tube, aiming to solve the problem of high cost of using an external resistor to detect the circuit in the prior art.

[0004] The present invention is implemented in this way. The present invention provides a bidirectional current detection method for a POWER tube, comprising: Obtaining a bidirectional current signal of the POWER tube, and performing signal processing on the bidirectional current signal through a POWER detection part and a common-mode component current conversion unit electrically connected to the POWER tube, respectively, to obtain a POWER detection signal and a common-mode component signal; Superimposing bias voltages on the POWER detection signal and the common mode component signal to obtain a POWER detection signal and a second detection signal; The POWER detection signal and the second detection signal are processed by a detection signal processing module electrically connected to the POWER detection part and a second signal processing module electrically connected to the common-mode component current conversion unit to obtain a voltage feedback signal; wherein the voltage feedback signal has a fixed proportional relationship with the bidirectional current signal.

[0005] The present invention provides a bidirectional current detection method for a POWER tube, which has the following beneficial effects: The present invention processes the bidirectional current signal of the POWER tube respectively through the POWER detection part and the common-mode component current conversion unit to obtain the POWER detection signal and the common-mode component signal, processes the POWER detection signal through the detection signal processing module to obtain the conversion current signal, differentially synthesizes the conversion current signal and the common-mode component signal through the differential current synthesis unit to generate a feedback current signal, and transmits the feedback current signal to the external resistor Rext to generate a mapping voltage signal. The method can accurately detect the bidirectional current signal of the POWER tube and generate a voltage signal proportional to the current signal strength. Through differential synthesis processing, the accuracy and stability of the signal are improved, the strength display of the POWER tube current signal is realized, and the problem of high cost of using external resistors to detect circuits in the prior art is solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is a schematic diagram of the steps of a bidirectional current detection method of a POWER tube provided by an embodiment of the present invention; Figure 2 It is a structural schematic diagram of a circuit used in a bidirectional current detection method for a POWER tube provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0007] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention 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 invention and are not intended to limit the present invention.

[0008] The implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0009] Reference Figure 1 , Figure 2 As shown, a preferred embodiment of the present invention is provided.

[0010] In a first aspect, the present invention provides a bidirectional current detection method for a POWER tube, comprising: S1: Obtain a bidirectional current signal of the POWER tube, and respectively perform signal processing on the bidirectional current signal through a POWER detection part and a common-mode component current conversion unit electrically connected to the POWER tube to obtain a POWER detection signal and a common-mode component signal; S2: Processing the POWER detection signal by a detection signal processing module electrically connected to the POWER detection part to obtain a conversion current signal; S3: performing differential synthesis processing on the conversion current signal and the common-mode component signal through a differential current synthesis unit electrically connected to the detection signal processing module and the common-mode component current conversion unit to obtain a feedback current signal; wherein the feedback current signal is in a fixed ratio with the bidirectional current signal of the POWER tube; S4: The feedback current signal is transmitted to the external resistor Rext through an electrical connection to generate a corresponding mapping voltage signal on the external resistor Rext; wherein the mapping voltage signal is in a fixed ratio with the bidirectional current signal of the POWER tube to display the signal strength of the bidirectional current signal of the POWER tube.

[0011] Specifically, in step S1 of the embodiment provided by the present invention, a bidirectional current signal is obtained from the POWER tube. The current signal is obtained by electrically connecting the detection circuit to the target POWER tube, thereby introducing the bidirectional current signal of the POWER tube.

[0012] More specifically, POWER tube is PowerMOSFET, which means power field effect transistor. POWER tube is a voltage-controlled semiconductor device, mainly used for power amplification and switching applications. It is a type of metal oxide semiconductor field effect transistor (MOSFET) with the characteristics of simple driving circuit, fast switching speed and high operating frequency.

[0013] It should be noted that a bidirectional current signal means that the current signal can flow in two directions, which can be either a forward current or a reverse current. In simple terms, a bidirectional current signal means that the current of the signal can change between positive and negative directions, and is usually used to indicate the direction and magnitude of current flow.

[0014] More specifically, the acquired bidirectional current signal is sent to two different circuit units respectively. The POWER detection part is specifically used to process the effective component in the current signal and extract the useful detection signal. The common-mode component current conversion unit is used to extract the common-mode component in the current signal for subsequent compensation or correction.

[0015] More specifically, the signal processing of the POWER detection part may include signal processing operations such as filtering, amplification, and rectification to extract the effective component representing the current signal to obtain a POWER detection signal, which reflects the effective value or characteristics of the current.

[0016] More specifically, the common-mode component current conversion unit focuses on extracting common-mode components in the current signal, which are usually noise or interference, and the common-mode component signal contains the common-mode noise or interference components in the current signal.

[0017] It can be understood that by extracting the effective signal and the common-mode signal respectively, the useful signal and noise can be effectively separated, and the quality and accuracy of the signal can be improved. The common-mode component current conversion unit can detect and identify common-mode noise, providing a basis for subsequent noise suppression. The POWER detection signal obtained by the POWER detection part can accurately reflect the actual situation of the current signal and improve the measurement accuracy. The common-mode component signal obtained by the common-mode component current conversion unit can be used for subsequent signal correction and compensation, further improving the accuracy of signal processing.

[0018] Specifically, in step S2 of the embodiment provided by the present invention, the POWER detection signal obtained from S1 represents the effective component of the current signal. Since the current signal in the POWER tube is a bidirectional current signal, when detecting the POWER detection signal, it is necessary to convert it into a unidirectional detection signal to be combined with the subsequent common-mode component signal to obtain a feedback current signal.

[0019] It is understandable that the POWER detection signal, which is a bidirectional current signal, cannot be directly combined with the common mode component signal to obtain an effective result, so a detection signal processing module is required to perform signal processing conversion on it.

[0020] More specifically, the common-mode component current usually refers to the part of the current signal that is in the same direction as the reference ground or common ground. The common-mode signal is an interference signal or background noise. The function of the common-mode component current conversion unit is to extract the common-mode component from the converted current signal and convert it into a special common-mode signal. Its main goal is to separate the common-mode component and the differential component, so as to process the signal more accurately.

[0021] Specifically, in step S3 of the embodiment provided by the present invention, the differential current synthesis unit receives the conversion current signal from the detection signal processing module and the common mode component signal from the common mode component current conversion unit. Through differential synthesis processing, it combines the two signals, where differential synthesis refers to operating the conversion current signal and the common mode component signal (usually subtracting or weighted adding), thereby extracting the differential part of the signal and eliminating the common mode noise or interference component.

[0022] More specifically, in actual operation, differential synthesis processing can achieve the following goals: Eliminate common-mode noise: Remove common-mode components from the signal, retain useful differential components, and improve signal quality; Enhance signal accuracy: Differential synthesis can ensure that the feedback signal is more accurate and consistent with the actual current signal of the current source (such as a POWER tube).

[0023] More specifically, after differential synthesis, the generated signal is the feedback current signal, which reflects the actual state of the current and maintains a fixed proportional relationship with the bidirectional current signal of the POWER tube.

[0024] More specifically, for the POWER detection signal as a bidirectional current signal, the feedback current signal will be able to accurately reflect the direction and magnitude of the current, and will be proportional to the current carried by the POWER tube (which may be a power switching device). The fixed proportional relationship means that the magnitude of the feedback current signal is linearly related to the current carried by the POWER tube. For example, if the ratio between the feedback current signal and the POWER tube current is 1:1, then when the current of the POWER tube increases or decreases, the feedback current signal will also increase or decrease accordingly.

[0025] It can be understood that the feedback current signal will accurately reflect the current state in the power supply or load, and maintain a fixed ratio with the actual bidirectional current signal of the POWER tube, which helps the current control system to respond quickly and adjust the current flow of the system to meet the load requirements. Through the processing of the common-mode component current conversion unit, the system can effectively suppress common-mode noise. Common-mode components are usually caused by imbalance, interference or external noise sources in the system. Removing these components through differential synthesis can improve the quality of the signal and ensure the accuracy of the signal. The differential synthesis process helps to filter out unnecessary common-mode signals, making the final feedback current signal more stable, which is crucial to the stability of the system, especially in applications such as high-precision current control, feedback loops and power management.

[0026] Specifically, in step S4 of the embodiment provided by the present invention, the feedback current signal is generally a current signal generated by modules such as a detection signal processing module and a common-mode component current conversion unit, which reflects the state of the current and has a fixed proportional relationship with the bidirectional current signal of the POWER tube. The feedback current signal is transmitted to the external resistor Rext through an electrical connection (such as a cable or wire).

[0027] More specifically, the external resistor Rext acts as a current-to-voltage converter. When a current signal passes through the resistor, a voltage signal is generated across the resistor according to Ohm's law. The voltage signal is proportional to the current signal passing through the resistor.

[0028] More specifically, the mapped voltage signal is generated by the voltage drop on Rext, which directly reflects the strength of the feedback current signal. The amplitude of this voltage signal is proportional to the current strength passing through the resistor, so it can be used as a visual output of the current signal. The voltage signal can be transmitted to a display device, data acquisition system, or control system for real-time monitoring, adjustment, and analysis.

[0029] More specifically, since the feedback current signal is in a fixed ratio with the bidirectional current signal of the POWER tube, the mapping voltage signal also maintains a fixed ratio with the current signal of the POWER tube. If the ratio of the feedback current signal to the current signal of the POWER tube is 1:1 (i.e., direct mapping), then the mapping voltage signal generated by Rext will also be directly proportional to the current signal of the POWER tube. This proportional relationship ensures that when the mapping voltage signal changes, it can accurately reflect the current signal strength of the POWER tube, making it easier to display the current size through the voltage signal.

[0030] More specifically, changes in the mapped voltage signal will be displayed, usually through a display screen, indicator light or other instrument to show the strength of the current signal. The mapped voltage signal can be used for dynamic display, warning or feedback control. For example, in a battery management system, the mapped voltage signal can reflect the actual flow of current, thereby helping to adjust the working state of the power tube in real time.

[0031] It is understandable that mapping voltage signals provides a means of visualizing current signals. By converting current signals into voltage signals, users can directly observe changes in current intensity through a display screen or meter without directly measuring the current itself. Mapping voltage signals can be used to monitor current changes in real time, helping system maintenance personnel to quickly detect and diagnose system status. The mapping voltage signal is in a fixed proportional relationship with the current signal of the POWER tube, which means that changes in the mapping voltage can accurately reflect the magnitude of the current. This provides high accuracy and reliability for the display of current intensity, especially in power switches or high-precision current measurement systems, which can accurately display the real-time status of the current.

[0032] The present invention provides a bidirectional current detection method for a POWER tube, which has the following beneficial effects: The present invention processes the bidirectional current signal of the POWER tube respectively through the POWER detection part and the common-mode component current conversion unit to obtain the POWER detection signal and the common-mode component signal, processes the POWER detection signal through the detection signal processing module to obtain the conversion current signal, differentially synthesizes the conversion current signal and the common-mode component signal through the differential current synthesis unit to generate a feedback current signal, and transmits the feedback current signal to the external resistor Rext to generate a mapping voltage signal. The method can accurately detect the bidirectional current signal of the POWER tube and generate a voltage signal proportional to the current signal strength. Through differential synthesis processing, the accuracy and stability of the signal are improved, the strength display of the POWER tube current signal is realized, and the problem of high cost of using external resistors to detect circuits in the prior art is solved.

[0033] It can be seen that the technical solution of the present invention has a reasonably corresponding common-mode bias structure, realizes current-type conversion output, and has a common-mode current regulation structure. Its progress lies in: it can achieve high linearity in both low and high current detection, has extremely low sensitivity to temperature and overall deviation, can be flexibly adjusted for various adaptation deviations, and the detection output method can be flexibly applied to other applications.

[0034] Preferably, the step of performing signal processing on the POWER detection signal through a detection signal processing module electrically connected to the POWER detection part to obtain a conversion current signal comprises: S21: performing standardization processing on the POWER detection signal through a detection signal single-end conversion unit in a detection signal processing module electrically connected to the POWER detection part to output a POWER signal in a standard processing format; S22: performing current conversion processing on the POWER signal in the standard processing format through the detection signal current conversion unit electrically connected to the detection signal single-ended conversion unit in the detection signal processing module to obtain a corresponding conversion current signal.

[0035] Specifically, standardization processing is the first step of signal preprocessing, and its purpose is to convert the original POWER detection signal into a standard format for subsequent signal processing. The original POWER detection signal is standardized by the detection signal single-ended conversion unit in the detection signal processing module electrically connected to the POWER detection part. The function of the conversion unit is to adjust the amplitude, frequency or other characteristics of the detection signal to a standard range. The output standard format signal can be a uniform voltage amplitude or frequency range, so that the signal can be further converted and processed.

[0036] More specifically, after the standardization process, the signal will be further processed by the current conversion unit in the detection signal processing module. The function of the current conversion unit is to convert the standardized signal into a current signal. Generally speaking, this conversion process is based on Ohm's law or other electrical conversion principles to convert the standard voltage signal into a corresponding current signal. The converted current signal is usually proportional to the strength of the detection signal. The output signal of this process is the final converted current signal.

[0037] More specifically, by processing the detection signal current conversion unit, the converted current signal obtained can be used for subsequent monitoring, regulation or feedback control systems. This signal can usually be used for real-time display, current monitoring, control strategy adjustment, etc., or as an input for further signal processing.

[0038] It can be understood that the standardization process can eliminate deviations, noise or inconsistencies in the original signal, so that the signal remains consistent throughout the entire processing chain. This ensures that subsequent steps will not be affected by the quality problems of the original signal, improving the stability of the entire system. During the conversion process, the standardization process can also remove unnecessary stray signals, making the current signal more accurate and reliable.

[0039] Preferably, the POWER detection part includes a POWER tube Q10, a resistor R1, a resistor R2 and a voltage source Vcm.

[0040] Specifically, the POWER tube Q10 is a bidirectional current control element, which is usually used for switching control or regulation of large currents. It can inject bidirectional current signals and transmit the current signals to the system through electrical connection with the resistor R1 and the voltage source Vcm. The POWER tube Q10 is used to inject bidirectional current signals into the circuit and is grounded. This design enables it to be used as a current source or current control element to adjust the direction and size of the current.

[0041] More specifically, resistor R1 is a basic resistor element connected to POWER tube Q10 and resistor R2. Resistor R1 plays a role of current limiting and voltage dividing in the circuit. It is connected to POWER tube Q10 to control the current intensity flowing through the circuit to ensure that the current signal is not too large or too small, thereby protecting other components in the circuit. R1 is also connected to the negative pole of the voltage source Vcm, forming a key component of the signal.

[0042] More specifically, resistor R2 is another resistor element connected to resistor R1 and the positive electrode of voltage source Vcm. R2 works together with R1 to form a voltage divider circuit to control signal transmission and voltage distribution. It is also electrically connected to the detection signal processing module to transmit the signal to the subsequent signal processing module. R2 helps to balance the current and voltage in the circuit to ensure stable signal transmission.

[0043] More specifically, the voltage source Vcm is a source component that provides a stable voltage. Its positive pole is electrically connected to the common-mode component current conversion unit, and its negative pole is connected to the negative pole of the POWER tube Q10 and the resistor R1. Vcm is used to provide the common-mode level required for differential detection for the common-mode component current conversion unit. This voltage source plays an important role in the circuit, providing a common-mode voltage, thereby ensuring that the voltage difference between the various signal paths in the circuit can be accurately detected and converted.

[0044] It can be understood that, on the whole, the structural function of the POWER detection part is to provide accurate and stable current signals for subsequent signal processing, and can adjust parameters such as voltage and current flow direction according to different current signals. Through the collaboration of POWER tube Q10, resistor R1, resistor R2 and voltage source Vcm, the circuit will properly convert and adjust the input signal to ensure that the signal transmitted to the detection signal processing module is in the appropriate range in terms of current, voltage and common mode level, which enables subsequent signal processing (such as current conversion, standardization processing, etc.) to proceed smoothly and ensure the reliability of the system.

[0045] Preferably, the detection signal single-ended conversion unit comprises an operational amplifier △1, a resistor R3 and a resistor R4.

[0046] Specifically, an operational amplifier (Operational Amplifier, referred to as Op-Amp) is usually a high-gain electronic amplifying element with two input terminals (a positive input terminal and an inverting input terminal) and an output terminal. The input terminals of the operational amplifier receive different signals respectively, and the output terminal amplifies or processes according to the input signals. The positive input terminal (+) receives the signal from the output of the POWER detection part, and the inverting input terminal (-) is connected to resistors R3 and R4 to form a negative feedback network, thereby determining the gain and output behavior of the operational amplifier.

[0047] More specifically, resistor R3 and resistor R4 are passive components connected to the inverting input terminal of the operational amplifier, forming a negative feedback circuit. Resistor R3 is connected to the ground to provide a reference voltage, and resistor R4 is connected to the output terminal of the operational amplifier to control the gain and stability of the amplifier through negative feedback.

[0048] More specifically, the signal output from the POWER detection part is input through the non-phase input terminal of the operational amplifier, the inverting input terminal is connected to the ground through resistor R3, and is connected to the output terminal of the operational amplifier through resistor R4, and the output terminal of the operational amplifier is connected to the detection signal current conversion unit through signal transmission, and the processed signal is passed to the subsequent module.

[0049] It can be understood that the main function of this structure is to receive the signal from the POWER detection part and process the signal through the operational amplifier △1 to achieve the effect of signal amplification or conversion.

[0050] More specifically, operational amplifier △1 mainly amplifies or converts the signal through negative feedback control. In this structure, it receives the signal output from the POWER detection part and performs gain adjustment or linear amplification on it. The gain of the operational amplifier is determined by the resistance ratio of resistor R3 and resistor R4. The amplification of the operational amplifier helps to enhance the weak input signal so that the signal can be effectively processed by the subsequent modules. The amplified signal has higher stability and stronger signal strength when it is transmitted throughout the circuit.

[0051] More specifically, resistors R3 and R4 form a typical negative feedback network. The role of negative feedback is to keep the output of the operational amplifier stable and prevent it from entering a saturated state or an unstable working state. By adjusting the values ​​of R3 and R4, the gain can be controlled, and then the amplitude of the output signal can be adjusted. Negative feedback helps to ensure linear amplification of the signal and prevent distortion and overload. Therefore, the accuracy and stability of the signal can be maintained during subsequent processing such as current conversion.

[0052] More specifically, the non-inverting input of the operational amplifier is connected to the POWER detection part, which means that it directly receives the signal from the previous stage circuit. The amplification effect of the operational amplifier ensures that the received signal is effectively amplified for subsequent processing. The signal processed by the operational amplifier (after amplification and gain adjustment) will be output to the detection signal current conversion unit. These amplified or converted signals can be further used for current signal conversion, standardization or other processing. The output signal of the operational amplifier is suitable for the subsequent current signal conversion module, so that the current signal can accurately reflect the input signal from the POWER detection part.

[0053] Preferably, the detection signal current conversion unit includes an operational amplifier △2, a transistor Q1, a transistor Q2 and a transistor Q3.

[0054] Specifically, the operational amplifier (Op-Amp) △2 has two input terminals (a positive input terminal and an inverting input terminal) and an output terminal, which is responsible for signal amplification and regulation. The positive input terminal is connected to the detection signal single-ended conversion unit to receive the signal from the previous circuit, and the inverting input terminal is connected to the transistor Q2. Q2 works together with the negative feedback network of the operational amplifier to affect its gain and output behavior.

[0055] More specifically, transistor Q1 is a transistor connected to the output terminal of operational amplifier △2. It usually works as a switch or amplifier. The function of Q1 is to receive the output signal from the operational amplifier and output current through its collector or source. It can form a multi-stage amplification or current regulation circuit with other transistors.

[0056] More specifically, one end of transistor Q2 is connected to the base (or gate) of transistor Q1, and the other end is connected to the inverting input terminal of the operational amplifier, and Q2 is grounded. Q2 acts as a feedback element to control the input terminal of the operational amplifier so that the signal can achieve appropriate current transfer or current regulation between Q1 and Q2.

[0057] More specifically, transistor Q3 is connected to the output end of transistor Q1 to form a parallel current path. In addition, the other end of Q3 is electrically connected to the differential current synthesis unit. Q3 can be used for further signal adjustment to form a current conversion unit, which is responsible for converting the input current signal into a current signal suitable for the differential current synthesis unit. The main function of this unit is to convert the signal processed by the operational amplifier into a current signal, and may amplify, adjust and feedback control. The following is an analysis of the functions of each component: More specifically, operational amplifier △2 receives the signal from the detection signal single-ended conversion unit and amplifies or adjusts it through its non-phase input terminal, and the inverting input terminal forms negative feedback through the connection of transistor Q2 to help the operational amplifier maintain a linear working state. The main function of the operational amplifier is to adjust the gain of the input signal and provide a stable output signal to ensure that the subsequent transistor can receive a signal of appropriate strength.

[0058] More specifically, transistor Q1 acts as a key current switch or amplifier element, receiving the output signal of operational amplifier △2 and controlling the flow of current according to the size of the input signal. It converts the voltage signal into a current signal and amplifies or transmits the current signal. Transistor Q2 is connected to the inverting input terminal of the operational amplifier and the base of Q1 to form a negative feedback loop. This configuration helps stabilize the operating point of the operational amplifier and controls the current at the input terminal of the operational amplifier by adjusting the conduction degree of Q2. Q2 plays a role in regulating and stabilizing the signal, and ensures the stability of the circuit by grounding.

[0059] More specifically, transistor Q3 acts as a current conducting element, connected to the output end of Q1, and transmits current to the differential current synthesis unit of the next stage. The role of Q3 is to provide appropriate current in this circuit and ensure that the current is properly converted between Q1 and Q3 to meet the requirements of the differential current synthesis unit.

[0060] More specifically, through the combination of operational amplifiers and transistors, the unit can convert the input signal from a voltage signal into a current signal to meet the needs of the subsequent differential current synthesis unit. The operational amplifier controls the amplification and feedback of the signal, while the transistor plays a core role in signal conditioning and current conversion.

[0061] Preferably, the common-mode component current conversion unit includes an operational amplifier Δ3, a transistor Q4, a transistor Q5 and a transistor Q6.

[0062] Specifically, operational amplifier △3 is a high-gain amplifier with two input terminals (positive input terminal and negative input terminal) and one output terminal. It is mainly used to amplify, adjust and feedback control the input signal. The positive input terminal is connected to the output terminal of the POWER detection part to receive the voltage signal from the previous stage. The negative input terminal is connected to the ground through transistor Q5 and forms a negative feedback loop with the input terminal of transistor Q4. The function of the operational amplifier is to amplify the input signal and adjust the gain and stability according to the feedback circuit.

[0063] More specifically, transistor Q4 is connected to the output end of operational amplifier △3. Transistor Q4 receives the amplified signal from the operational amplifier and controls the flow of current through its output end. The function of Q4 is similar to that of a current amplifier, which is responsible for converting the input signal into current and providing the current required by the subsequent circuit.

[0064] More specifically, one end of transistor Q5 is connected to transistor Q4, and the other end is connected to the inverting input terminal of operational amplifier △3, and Q5 is grounded. The main function of Q5 is to affect the operating point of operational amplifier △3 through a negative feedback loop and adjust the gain of the signal. The grounding of Q5 ensures the stability of the operational amplifier and controls the conversion process of the input signal so that the signal can be correctly converted into current.

[0065] More specifically, transistor Q6 is connected to the output end of transistor Q4 to form a current output path. The other end of Q6 is electrically connected to the differential current synthesis unit, which is responsible for transmitting the processed current signal to the next level module. The function of Q6 is to control and transmit the current output by Q4 to meet the current demand of the differential current synthesis unit.

[0066] It can be understood that the function of this unit is mainly to process, adjust, and finally convert the common mode signal from the POWER detection part into a current signal through an operational amplifier and a transistor.

[0067] Among them, operational amplifier △3 receives the common-mode signal from the POWER detection part and amplifies it through its positive input terminal. The output signal of the operational amplifier will be converted by transistor Q4 to form a current. The inverting input terminal is connected through transistor Q5 to form a negative feedback mechanism to ensure the gain stability of the operational amplifier and prevent the output signal from being over-amplified or saturated. Negative feedback regulation is the key to maintaining system stability. Through the gain adjustment of operational amplifier △3, it ensures that the signal is effectively processed and ready for current conversion.

[0068] Transistor Q4 is responsible for converting the signal processed by the operational amplifier into a current. Q4 acts as a current switch or amplifier to convert the output voltage signal of the operational amplifier into a current signal. The output current of Q4 provides the required current for the subsequent differential current synthesis unit.

[0069] Transistor Q5 acts as a negative feedback element, affecting the inverting input terminal of operational amplifier △3. The grounding function of Q5 ensures the stable operation of the operational amplifier and adjusts the signal conversion process. Q5 adjusts the gain and ensures that the input signal of the operational amplifier is within a stable working range, so that the amplified signal can obtain accurate current conversion when passing through Q4.

[0070] Transistor Q6 is connected to transistor Q4 and is responsible for transmitting the current generated by Q4 to the next-level circuit, especially the differential current synthesis unit. The function of Q6 is to further control the output current to ensure that the transmitted current meets the requirements of the next-level circuit. The output of Q6 provides an appropriate current signal to the differential current synthesis unit to ensure that the unit can work as required.

[0071] It can be seen that the core function of this unit is to convert the input common-mode voltage signal into a current signal, which is achieved through the gain adjustment of the operational amplifier △3 and the current control of the transistor Q4. Through appropriate gain control and negative feedback, the entire current conversion process is stabilized and the accuracy of the signal is ensured. Through the cooperation of transistors Q4 and Q6, a current signal suitable for the differential current synthesis unit is finally formed.

[0072] Preferably, the differential current synthesis unit includes a transistor Q7, a transistor Q8, a transistor Q11 and a transistor Q12.

[0073] Specifically, transistor Q7 is connected to the common-mode component current conversion unit. Q7 receives a current signal from the common-mode component current conversion unit, which usually represents the current of the common-mode component. The main function of Q7 is to introduce the current from the common-mode signal into the differential current synthesis unit and form a current feedback and synthesis mechanism with other transistors.

[0074] More specifically, transistor Q8 is connected to the detection signal processing module and receives the current signal of the module. These current signals may be the result of signal amplification, regulation or conversion. Q8 is responsible for receiving the signal and outputting the converted current signal. It is connected in parallel with Q11 to form a parallel combination with the external resistor Rext.

[0075] More specifically, transistor Q12 is connected to transistor Q7 and transistor Q11 respectively. One end of Q12 is connected to Q7 and Q11, and the other end is grounded. Q12 acts as a load or feedback element, and together with Q7 and Q11, forms a current feedback mechanism to control the current flow direction and stability.

[0076] More specifically, transistor Q11 is connected to transistor Q12 and transistor Q8. Q11 and Q8 are connected in parallel with an external resistor Rext. Q11 is used in this circuit to output a common-mode component signal as a common-mode current and synthesize it with the output current signal of Q8. Another function of Q11 is to provide a stable reference current for the circuit through grounding.

[0077] More specifically, resistor Rext is connected in parallel with Q8 and Q11 as a key part of current regulation and feedback control. The role of Rext is to limit and regulate the magnitude of the current to ensure that the circuit output is stable and meets the requirements.

[0078] It can be seen that the function of this differential current synthesis unit is to process and synthesize the input current signal (from the common-mode component current conversion unit and the detection signal processing module) through a combination of different transistors, and finally form a suitable feedback current signal.

[0079] Specifically, transistor Q7 receives the current signal from the common-mode component current conversion unit, is mainly used to introduce the common-mode component current, and works together with other transistors to introduce the common-mode current signal into the circuit of the differential current synthesis unit, ready to be combined with the signal from the detection signal processing module.

[0080] More specifically, transistor Q8 receives converted current signals from the detection signal processing module, which are regulated signal currents. Q8 is connected in parallel with transistor Q11 and to the external resistor Rext to output converted current signals. The current of Q8 is combined with the output signal of Q11 to form a synthetic feedback current signal. Q8 acts as a current converter here. It not only outputs current signals, but also ensures current regulation and feedback control through a parallel relationship with Q11.

[0081] More specifically, the function of transistor Q12 is to be connected to transistor Q7 and transistor Q11 and to ground to form a current feedback loop. The connection method of Q12 helps stabilize the current output and allows the current to flow correctly between Q7, Q8 and Q11. Since Q12 is grounded, it may play a role in current reference and stabilization, ensuring the stability of the circuit and avoiding abnormal current fluctuations.

[0082] More specifically, transistor Q11, as a key current output element, is responsible for outputting a common-mode component signal as a common-mode current. It receives current from Q12 and Q8 and controls the current flow direction in order to output the signal correctly. Q11 not only provides common-mode signal output, but also adjusts the signal size through parallel configuration with Q8 and Rext. The role of Q11 is to ensure that the current output meets the requirements and works stably.

[0083] More specifically, the resistor Rext is connected in parallel with Q8 and Q11, and its function is to adjust the output current. It limits the flow of current and forms a necessary current feedback loop between Q8 and Q11. Rext ensures that the output signal of the current synthesis unit will not be over-amplified or unstable, thereby ensuring the accuracy and stability of the synthesized current signal.

[0084] More specifically, the main task of the differential current synthesis unit is to synthesize the common-mode signal from the common-mode component current conversion unit with the conversion current signal from the detection signal processing module. The two are combined in parallel through Q8 and Q11 to synthesize a suitable feedback current signal, and the synthesized signal will be output through the current feedback loop to form a stable feedback current signal.

[0085] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A bidirectional current detection method for a POWER tube, characterized in that: include: Obtaining a bidirectional current signal of the POWER tube, and performing signal processing on the bidirectional current signal through a POWER detection part and a common-mode component current conversion unit electrically connected to the POWER tube, respectively, to obtain a POWER detection signal and a common-mode component signal; Processing the POWER detection signal by a detection signal processing module electrically connected to the POWER detection part to obtain a conversion current signal; The conversion current signal and the common-mode component signal are differentially synthesized by a differential current synthesis unit electrically connected to the detection signal processing module and the common-mode component current conversion unit to obtain a feedback current signal; wherein the feedback current signal is in a fixed ratio with the bidirectional current signal of the POWER tube; The feedback current signal is transmitted to the external resistor Rext through an electrical connection to generate a corresponding mapping voltage signal on the external resistor Rext; wherein the mapping voltage signal is in a fixed ratio with the bidirectional current signal of the POWER tube to display the signal strength of the bidirectional current signal of the POWER tube.

2. A bidirectional current detection method for a POWER tube as claimed in claim 1, characterized in that: The step of processing the POWER detection signal by a detection signal processing module electrically connected to the POWER detection part to obtain a conversion current signal comprises: The POWER detection signal is subjected to standardization processing by a detection signal single-end conversion unit in a detection signal processing module electrically connected to the POWER detection part, so as to output a POWER signal in a standard processing format; The detection signal current conversion unit in the detection signal processing module, which is electrically connected to the detection signal single-end conversion unit, performs current conversion processing on the POWER signal in the standard processing format to obtain a corresponding conversion current signal.

3. A bidirectional current detection method for a POWER tube as claimed in claim 1, characterized in that: The POWER detection part includes a POWER tube Q10, a resistor R1, a resistor R2 and a voltage source Vcm; The POWER tube Q10 is used to inject a bidirectional current signal, and the POWER tube Q10 is grounded; The POWER tube Q10 is electrically connected to the resistor R1 and the negative electrode of the voltage source Vcm respectively, the resistor R2 is electrically connected to the resistor R1 and the positive electrode of the voltage source Vcm respectively, and the resistor R1 and the resistor R2 are both electrically connected to the detection signal processing module; The positive electrode of the voltage source Vcm is electrically connected to the common-mode component current conversion unit, and the voltage source Vcm is used to provide a common-mode level of differential detection to the common-mode component current conversion unit.

4. A bidirectional current detection method for a POWER tube as claimed in claim 2, characterized in that: The detection signal single-ended conversion unit includes an operational amplifier △1, a resistor R3 and a resistor R4; The non-inverting input terminal of the operational amplifier △1 is electrically connected to the POWER detection part, and is used to receive the POWER detection signal output by the POWER detection part; The inverting input terminal of the operational amplifier △1 is electrically connected to the resistor R3 and the resistor R4 respectively, and the resistor R4 is electrically connected to the output terminal of the operational amplifier △1, and the resistor R3 and the resistor R4 are grounded; The output end of the operational amplifier △1 is electrically connected to the detection signal current conversion unit.

5. A bidirectional current detection method for a POWER tube as claimed in claim 2, characterized in that: The detection signal current conversion unit includes an operational amplifier △2, a transistor Q1, a transistor Q2 and a transistor Q3; The non-inverting input terminal of the operational amplifier △2 is electrically connected to the detection signal single-ended conversion unit, the transistor Q1 is electrically connected to the output terminal of the operational amplifier △2, the transistor Q2 is electrically connected to the transistor Q1 and the inverting input terminal of the operational amplifier △2 respectively, and the transistor Q2 is grounded; The transistor Q3 is electrically connected to the transistor Q1 , and the transistor Q3 is electrically connected to the differential current synthesis unit.

6. A bidirectional current detection method for a POWER tube as claimed in claim 1, characterized in that: The common-mode component current conversion unit includes an operational amplifier △3, a transistor Q4, a transistor Q5 and a transistor Q6; The non-inverting input terminal of the operational amplifier △3 is electrically connected to the POWER detection part, the transistor Q4 is electrically connected to the output terminal of the operational amplifier △3, the transistor Q5 is electrically connected to the transistor Q4 and the inverting input terminal of the operational amplifier △3 respectively, and the transistor Q5 is grounded; The transistor Q6 is electrically connected to the transistor Q4 , and the transistor Q6 is electrically connected to the differential current synthesis unit.

7. A bidirectional current detection method for a POWER tube as claimed in claim 1, characterized in that: The differential current synthesis unit includes a transistor Q7, a transistor Q8, a transistor Q11 and a transistor Q12; The transistor Q7 is electrically connected to the common-mode component current conversion unit; The transistor Q8 is electrically connected to the detection signal processing module; The transistor Q12 is electrically connected to the transistor Q7 and the transistor Q11 respectively, and the transistor Q12 is grounded; The transistor Q11 is electrically connected to the transistor Q12 and the transistor Q8 respectively, and the transistor Q11 is grounded; The transistor Q8 and the transistor Q11 are electrically connected to the external resistor Rext in parallel, the transistor Q11 is used to output a common-mode component signal as a common-mode current, and the transistor Q8 is used to output a conversion current signal, and the common-mode component signal is combined with the conversion current signal to form a feedback current signal.

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