A Bidirectional Current Detection Method for POWER Transistors

Abstract

The present invention relates to the technical field of current signal processing, and discloses a method for bidirectional current detection of a POWER transistor. In the present invention, the bidirectional current signals of the POWER transistor are respectively processed by a POWER detection part and a common-mode component current conversion unit to obtain a POWER detection signal and a common-mode component signal. The POWER detection signal is processed by a detection signal processing module to obtain a converted current signal. The converted current signal and the common-mode component signal are differentially synthesized by a differential current synthesis unit to generate a feedback current signal. The feedback current signal is transmitted to an external resistor Rext to generate a mapped voltage signal. This method can accurately detect the bidirectional current signal of the POWER transistor and generate a voltage signal proportional to the intensity of the current signal. Through differential synthesis processing, the accuracy and stability of the signal are improved, and the intensity display of the current signal of the POWER transistor is realized, solving the problem of high circuit cost in the prior art for detecting by using an external resistor.

Description

Technical Field

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

[0002] In the field of power electronics, accurate current detection and control are crucial for the performance and safe operation of equipment. In the prior art, the current detection of a motor generally adopts an external resistor method. Other similar in-chip detections are not easy to perform corresponding detection outputs. The external resistor method has a relatively 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 method for bidirectional current detection of a POWER transistor, aiming to solve the problem of relatively high circuit cost in the prior art when using an external resistor to detect current.

[0004] The present invention is implemented as follows. The present invention provides a method for bidirectional current detection of a POWER transistor, including:

[0005] Obtain the bidirectional current signal of the POWER transistor, and respectively perform signal processing on the bidirectional current signal through a POWER detection part electrically connected to the POWER transistor and a common-mode component current conversion unit to obtain a POWER detection signal and a common-mode component signal;

[0006] Superpose and input a bias voltage to the POWER detection signal and the common-mode component signal respectively to obtain a POWER detection signal and a second detection signal;

[0007] Through 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, perform signal processing on the POWER detection signal and the second detection signal to obtain a voltage feedback signal; wherein, the voltage feedback signal has a fixed proportional relationship with the bidirectional current signal.

[0008] The present invention provides a method for bidirectional current detection of a POWER transistor, having the following beneficial effects:

[0009] The present invention processes the bidirectional current signal of the POWER transistor through the POWER detection part and the common-mode component current conversion unit respectively to obtain the POWER detection signal and the common-mode component signal. The POWER detection signal is processed by the detection signal processing module to obtain the converted current signal. The converted current signal and the common-mode component signal are differentially synthesized by the differential current synthesis unit to generate the feedback current signal. The feedback current signal is transmitted to the external resistor Rext to generate the mapped voltage signal. This method can accurately detect the bidirectional current signal of the POWER transistor and generate a voltage signal proportional to the intensity of the current signal. Through differential synthesis processing, the accuracy and stability of the signal are improved, and the intensity display of the current signal of the POWER transistor is realized, solving the problem of high cost of detecting the circuit by using an external resistor in the prior art. Brief Description of the Drawings

[0010] Figure 1 is a schematic diagram of the steps of a method for detecting the bidirectional current of a POWER transistor provided by an embodiment of the present invention;

[0011] Figure 2 is a schematic diagram of the structure of a circuit used for a method for detecting the bidirectional current of a POWER transistor provided by an embodiment of the present invention. Detailed Embodiments

[0012] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to 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 used to limit the present invention.

[0013] The implementation of the present invention will be described in detail below with reference to specific embodiments.

[0014] Referring to Figure 1 and Figure 2 shown, a preferred embodiment of the present invention is provided.

[0015] In a first aspect, the present invention provides a method for detecting the bidirectional current of a POWER transistor, including:

[0016] S1: Obtain the bidirectional current signal of the POWER transistor, and process the bidirectional current signal respectively through the POWER detection part and the common-mode component current conversion unit electrically connected to the POWER transistor to obtain the POWER detection signal and the common-mode component signal;

[0017] S2: Process the POWER detection signal through the detection signal processing module electrically connected to the POWER detection part to obtain the converted current signal;

[0018] S3: The differential current synthesis unit, which is electrically connected to the detection signal processing module and the common-mode component current conversion unit, performs differential synthesis processing on the converted current signal and the common-mode component signal to obtain a feedback current signal; wherein, the feedback current signal has a fixed ratio with the bidirectional current signal of the POWER transistor.

[0019] S4: The feedback current signal is transmitted through electrical connection to an external resistor Rext to generate a corresponding mapped voltage signal on the external resistor Rext; wherein, the mapped voltage signal has a fixed ratio with the bidirectional current signal of the POWER transistor to display the signal strength of the bidirectional current signal of the POWER transistor.

[0020] Specifically, in step S1 of the embodiment provided by the present invention, a bidirectional current signal is obtained from the POWER transistor. The way to obtain the current signal is to electrically connect a detection circuit to the target POWER transistor, thereby introducing the bidirectional current signal of the POWER transistor.

[0021] More specifically, the POWER transistor is a PowerMOSFET, which means a power field effect transistor. The POWER transistor is a voltage-controlled semiconductor device mainly used for power amplification and switching applications. It belongs to a type of metal-oxide-semiconductor field effect transistor (MOSFET) and has characteristics such as a simple drive circuit, fast switching speed, and high operating frequency.

[0022] It should be noted that the bidirectional current signal refers to a current signal that can flow in two directions, either a forward current or a reverse current. Simply put, the bidirectional current signal means that the current of the signal can change between positive and negative directions and is usually used to represent the flow direction and magnitude of the current.

[0023] More specifically, the obtained bidirectional current signal is respectively sent to two different circuit units. The POWER detection part is specifically used to process the effective components in the current signal and extract useful detection signals. The common-mode component current conversion unit is used to extract the common-mode components in the current signal for subsequent compensation or correction.

[0024] More specifically, the signal processing of the POWER detection part can include signal processing operations such as filtering, amplification, and rectification to extract the effective components representing the current signal and obtain the POWER detection signal, which reflects the effective value or characteristics of the current.

[0025] More specifically, the common-mode component current conversion unit focuses on extracting the common-mode components in the current signal, which are usually noise or interference. The common-mode component signal contains the common-mode noise or interference components in the current signal.

[0026] It can be understood that by separately extracting the effective signal and the common-mode signal, the useful signal and the noise can be effectively separated, improving the quality and accuracy of the signal. The common-mode component current conversion unit can detect and identify the common-mode noise, providing a basis for subsequent noise suppression. The POWER detection signal obtained through the POWER detection section can accurately reflect the actual situation of the current signal, improving the measurement accuracy. The common-mode component signal obtained through the common-mode component current conversion unit can be used for subsequent signal correction and compensation, further improving the accuracy of signal processing.

[0027] Specifically, in step S2 of the embodiment provided by the present invention, the POWER detection signal is the POWER detection signal obtained from S1, representing the effective component of the current signal. Since the current signal in the POWER transistor is a bidirectional current signal, when detecting the POWER detection signal, it needs to be converted into a unidirectional detection signal to be combined with the subsequent common-mode component signal, so as to obtain the feedback current signal.

[0028] It can be understood that the POWER detection signal, as a bidirectional current signal, cannot be directly combined with the common-mode component signal to obtain an effective result. Therefore, the detection signal processing module needs to perform signal processing and conversion on it.

[0029] More specifically, the common-mode component current usually refers to the part of the current signal in the same direction as the reference ground or the common ground. The common-mode signal is the interference signal or the background noise. The function of the common-mode component current conversion unit is to extract the common-mode component from the conversion 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.

[0030] 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 these two signals. Here, the differential synthesis means performing an operation (usually subtraction or weighted addition) on the conversion current signal and the common-mode component signal, so as to extract the differential part in the signal and eliminate the common-mode noise or interference component.

[0031] More specifically, in actual operation, the differential synthesis processing can achieve the following purposes: eliminating common-mode noise: removing the common-mode component from the signal and retaining the useful differential component, improving the signal quality; enhancing the signal accuracy: the differential synthesis can ensure that the feedback signal is more accurate and consistent with the actual current signal of the current source (such as the POWER transistor).

[0032] More specifically, after differential synthesis, the generated signal is the feedback current signal. This signal will reflect the actual state of the current and maintain a fixed proportional relationship with the bidirectional current signal of the POWER transistor.

[0033] More specifically, for the POWER detection signal which is a bidirectional current signal, the feedback current signal will be able to accurately reflect the direction and magnitude of the current and is proportional to the current carried by the POWER transistor (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 transistor. For example, if the ratio between the feedback current signal and the POWER transistor current is 1:1, then when the current of the POWER transistor increases or decreases, the feedback current signal will increase or decrease accordingly.

[0034] It can be understood that the feedback current signal will accurately reflect the current state in the power supply or load, maintaining a fixed ratio with the actual bidirectional current signal of the POWER transistor. This helps the current control system to respond quickly, regulate the current flow in the system to meet the load demand. Through the processing of the common-mode component current conversion unit, the system can effectively suppress common-mode noise. The common-mode component is usually caused by imbalances, interference, or external noise sources in the system. Removing these components through differential synthesis can improve the signal quality and ensure the accuracy of the signal. The differential synthesis process helps to filter out unwanted common-mode signals, making the final feedback current signal more stable, which is crucial for the stability of the system, especially in applications such as high-precision current control, feedback loops, and power management.

[0035] Specifically, in step S4 of the embodiment provided by the present invention, the feedback current signal is usually a current signal generated by modules such as a detection signal processing module and a common-mode component current conversion unit. It reflects the state of the current and maintains a fixed proportional relationship with the bidirectional current signal of the POWER transistor. This feedback current signal is transmitted to the external resistor Rext through an electrical connection (such as a cable or wire).

[0036] More specifically, the external resistor Rext acts as a current-to-voltage converter. When the current signal passes through this resistor, according to Ohm's law, a voltage signal will be generated across the resistor, and this voltage signal is proportional to the current signal passing through the resistor.

[0037] More specifically, the mapped voltage signal is generated by the voltage drop across Rext and directly reflects the intensity of the feedback current signal. The amplitude of this voltage signal is proportional to the current intensity passing through the resistor, so it can be used as a visual output of the current signal. This voltage signal can be transmitted to a display device, a data acquisition system, or a control system for real-time monitoring, regulation, and analysis.

[0038] More specifically, since the feedback current signal has a fixed ratio to the bidirectional current signal of the POWER transistor, the mapped voltage signal also maintains a fixed ratio to the current signal of the POWER transistor. If the ratio of the feedback current signal to the POWER transistor current signal is 1:1 (i.e., direct mapping), then the mapped voltage signal generated by Rext will also be in direct proportion to the current signal of the POWER transistor. This proportional relationship ensures that when the mapped voltage signal changes, it can accurately reflect the intensity of the POWER transistor's current signal, facilitating the display of the current magnitude through the voltage signal.

[0039] More specifically, the change in the mapped voltage signal will be displayed, usually through a display screen, indicator light, or other instruments to show the intensity 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 current flow, thereby helping to adjust the working state of the power transistor in real time.

[0040] It can be understood that the mapped voltage signal provides a means of visualizing the current signal. By converting the current signal into a voltage signal, users can directly observe the change in the current intensity through a display screen or instrument without directly measuring the current itself. The mapped voltage signal can be used for real-time monitoring of current changes, helping system maintenance personnel quickly detect and diagnose the system status. The fixed proportional relationship between the mapped voltage signal and the POWER transistor's current signal means that the change in the mapped voltage can accurately reflect the magnitude of the current. This provides high precision and reliability for the display of the current intensity, especially in power switches or high-precision current measurement systems, where it can accurately display the real-time status of the current.

[0041] The present invention provides a method for detecting the bidirectional current of a POWER transistor, which has the following beneficial effects:

[0042] In the present invention, the signal processing of the bidirectional current signal of the POWER transistor is respectively carried out by the POWER detection part and the common-mode component current conversion unit to obtain the POWER detection signal and the common-mode component signal. The conversion current signal is obtained by processing the POWER detection signal through the detection signal processing module. The differential current synthesis unit performs differential synthesis on the conversion current signal and the common-mode component signal to generate the feedback current signal, and the feedback current signal is transmitted to the external resistor Rext to generate the mapped voltage signal. This method can accurately detect the bidirectional current signal of the POWER transistor and generate a voltage signal proportional to the current signal intensity. Through differential synthesis processing, the accuracy and stability of the signal are improved, realizing the display of the POWER transistor current signal intensity, and solving the problem of high circuit cost in the prior art when using an external resistor to detect the current.

[0043] It can be seen that the technical solution of the present invention has a reasonable corresponding common-mode bias structure, realizes current-mode conversion output, and has a common-mode current regulation structure. Its advantages are as follows: high linearity can be achieved in both low and high current detections, it is extremely insensitive to temperature and overall deviation, it can be flexibly adjusted for various adaptation deviations, and the detection output method can be flexibly applied to other applications.

[0044] 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 includes:

[0045] S21: Standardize the POWER detection signal through a detection signal single-ended conversion unit in the detection signal processing module electrically connected to the POWER detection part to output a POWER signal in a standard processing format;

[0046] S22: Perform current conversion processing on the POWER signal in the standard processing format through a 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.

[0047] Specifically, the standardization process is the first step of signal preprocessing. The purpose is to convert the original POWER detection signal into a standard format for subsequent signal processing. The POWER detection signal is standardized through a detection signal single-ended conversion unit in the detection signal processing module electrically connected to the POWER detection part. The function of this conversion unit is to adjust the amplitude, frequency or other characteristics of the detection signal to the standard range. The output standard format signal can be a unified voltage amplitude or frequency range for further signal conversion and processing.

[0048] More specifically, after the standardization process, the signal will be further subjected to current conversion processing through 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, 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 intensity of the detection signal. The output signal of this process is the final conversion current signal.

[0049] More specifically, through the processing of the detection signal current conversion unit, the obtained conversion current signal 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.

[0050] It is understandable that the standardization processing step can eliminate the deviations, noises or inconsistencies in the original signal, making the signal consistent throughout the processing chain. This ensures that subsequent steps are not affected by the quality problems of the original signal, improving the stability of the entire system. During the conversion process, the standardization processing can also remove unnecessary stray signals, making the current signal more accurate and reliable.

[0051] Preferably, the POWER detection section includes a POWER transistor Q10, a resistor R1, a resistor R2, and a voltage source Vcm.

[0052] Specifically, the POWER transistor Q10 is a bidirectional current control element, usually used for the switching control or regulation of large currents. Through its electrical connection with the resistor R1 and the voltage source Vcm, it can inject a bidirectional current signal and transmit the current signal into the system. The POWER transistor Q10 is used to inject a bidirectional current signal into the circuit and is grounded. This design enables it to act as a current source or a current control element to adjust aspects such as the direction and magnitude of the current.

[0053] More specifically, the resistor R1 is a basic resistor element connected to the POWER transistor Q10 and the resistor R2. The resistor R1 plays a role in current limiting and voltage division in the circuit. It is connected to the POWER transistor Q10 and, by controlling the current intensity flowing through the circuit, ensures that the current signal is neither too large nor 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 part of the signal.

[0054] More specifically, the resistor R2 is another resistor element connected to the positive pole of the resistor R1 and the voltage source Vcm. R2 works together with R1 to form a voltage division circuit, controlling the 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, ensuring the stable transmission of the signal.

[0055] 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, while its negative pole is connected to the negative pole of the POWER transistor 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 the common-mode voltage, thereby ensuring that the voltage differences between various signal paths in the circuit can be accurately detected and converted.

[0056] It can be understood that, overall, the structural function of the POWER detection section is to provide an accurate and stable current signal for subsequent signal processing, and it can adjust parameters such as voltage and current flow direction according to different current signals. Through the cooperation of the POWER transistor Q10, resistor R1, resistor R2, and voltage source Vcm, the circuit appropriately converts and regulates the input signal to ensure that the signal transmitted to the detection signal processing module is within an appropriate range in terms of current, voltage, and common-mode level. This enables subsequent signal processing (such as current conversion, normalization processing, etc.) to proceed smoothly and ensures the reliability of the system.

[0057] Preferably, the detection signal single-ended conversion unit includes operational amplifier △1, resistor R3, and resistor R4.

[0058] Specifically, an operational amplifier (abbreviated as Op-Amp) is usually a high-gain electronic amplification component with two input terminals (non-inverting input terminal and inverting input terminal) and one 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 non-inverting input terminal (+) receives the signal output from the POWER detection section, and the inverting input terminal (-) is connected to resistor R3 and resistor R4 to form a negative feedback network, thereby determining the gain and output behavior of the operational amplifier.

[0059] 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.

[0060] More specifically, the signal output from the POWER detection section is input through the non-inverting input terminal of the operational amplifier. The inverting input terminal is connected to the ground through resistor R3 and connected to the output terminal of the operational amplifier through resistor R4. The output terminal of the operational amplifier is connected to the detection signal current conversion unit through signal transmission to transfer the processed signal to the subsequent module.

[0061] It can be understood that the main function of this structure is to receive the signal from the POWER detection section and process the signal through operational amplifier △1 to achieve the effect of signal amplification or conversion.

[0062] More specifically, the operational amplifier △1 mainly amplifies or converts signals through negative feedback control. In this structure, it receives the signal output from the POWER detection section and adjusts its gain or linearly amplifies 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 boost the weak input signal so that the signal can be effectively processed by subsequent modules. The amplified signal has higher stability and stronger signal strength when transmitted throughout the circuit.

[0063] More specifically, resistor R3 and resistor 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 the saturation state or unstable operating state. By adjusting the values of R3 and R4, the gain can be controlled, and thus the amplitude of the output signal can be adjusted. Negative feedback helps to ensure the linear amplification of the signal, prevent distortion and overload. Therefore, the accuracy and stability of the signal can be maintained during subsequent processing such as current conversion.

[0064] More specifically, the non-inverting input terminal of the operational amplifier is connected to the POWER detection section, which means it directly receives the signal from the previous-stage circuit. The amplification of the operational amplifier ensures that the received signal is effectively amplified for subsequent processing. The signal (amplified and gain-adjusted) after being processed by the operational amplifier will be output to the detection signal current conversion unit. These amplified or converted signals can be further used for current signal conversion, normalization or other processing. The output signal of the operational amplifier is suitable for the subsequent current signal conversion module, enabling the current signal to accurately reflect the input signal from the POWER detection section.

[0065] Preferably, the detection signal current conversion unit includes operational amplifier △2, transistor Q1, transistor Q2, and transistor Q3.

[0066] Specifically, the operational amplifier (Op-Amp) △2 has two input terminals (non-inverting input terminal and inverting input terminal) and one output terminal, and is responsible for signal amplification and adjustment. The non-inverting input terminal is connected to the detection signal single-ended conversion unit to receive the signal from the previous-stage circuit. The inverting input terminal is connected to transistor Q2, and Q2 and the negative feedback network of the operational amplifier work together to affect its gain and output behavior.

[0067] 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 role of Q1 is to receive the output signal from the operational amplifier and output current through its collector or source, and can form a multi-stage amplification or current adjustment circuit with other transistors.

[0068] 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. Also, Q2 is grounded. Q2 serves as a feedback element to control the input terminal of the operational amplifier, enabling appropriate current transfer or current regulation between Q1 and Q2.

[0069] More specifically, transistor Q3 is connected to the output terminal 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 regulation, forming a current conversion unit, which is responsible for converting the input current signal into a current signal suitable for the differential current synthesis unit here. The main function of this unit is to convert the signal processed by the operational amplifier into a current signal and may perform amplification, regulation, and feedback control. The following is an analysis of the functions of each component:

[0070] More specifically, operational amplifier △2 receives the signal from the detection signal single-ended conversion unit and amplifies or adjusts it through its non-inverting input terminal. The inverting input terminal forms negative feedback through the connection of transistor Q2 to help the operational amplifier maintain a linear operating 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 transistors can receive signals of appropriate strength.

[0071] More specifically, transistor Q1, as a key current switch or amplification element, receives the output signal of operational amplifier △2 and controls the flow of current according to the magnitude 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 to 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.

[0072] More specifically, transistor Q3, as a current conduction element, is connected to the output terminal of Q1 to transfer the current to the next-stage differential current synthesis unit. The function of Q3 is to provide appropriate current in this circuit and ensure proper conversion of the current between Q1 and Q3 to meet the requirements of the differential current synthesis unit.

[0073] More specifically, through the combination of the operational amplifier and the transistor, this unit can convert the input signal from a voltage signal into a current signal to meet the requirements 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 regulation and current conversion.

[0074] Preferably, the common-mode component current conversion unit includes an operational amplifier △3, a transistor Q4, a transistor Q5, and a transistor Q6.

[0075] Specifically, the operational amplifier △3 acts as a high-gain amplifier with two input terminals (a non-inverting input terminal and an inverting input terminal) and an output terminal. It is mainly used to amplify, adjust, and feedback-control the input signal. The non-inverting input terminal is connected to the output terminal of the POWER detection section to receive the voltage signal from the previous stage. The inverting input terminal is connected to the ground through the transistor Q5 and forms a negative feedback loop with the input terminal of the transistor Q4. The role of the operational amplifier is to amplify the input signal and adjust the gain and stability according to the feedback circuit.

[0076] More specifically, the transistor Q4 is connected to the output terminal of the operational amplifier △3. The transistor Q4 receives the amplified signal from the operational amplifier and controls the flow of current through its output terminal. The role of Q4 is similar to that of a current amplifier, responsible for converting the input signal into current and providing the current required by the subsequent circuit.

[0077] More specifically, one end of the transistor Q5 is connected to the transistor Q4, and the other end is connected to the inverting input terminal of the operational amplifier △3. At the same time, Q5 is grounded. The main role of Q5 is to affect the operating point of the operational amplifier △3 through the negative feedback loop and adjust the gain of the signal. Q5 being grounded ensures the stability of the operational amplifier and controls the conversion process of the input signal, enabling the signal to be correctly converted into current.

[0078] More specifically, the transistor Q6 is connected to the output terminal of the transistor Q4 to form a current output path. The other end of Q6 is electrically connected to the differential current synthesis unit, responsible for transmitting the processed current signal to the next-stage module. The role of Q6 is to control and transmit the current output by Q4 to meet the current requirements of the differential current synthesis unit.

[0079] It can be understood that the function of this unit is mainly to process, adjust the common-mode signal from the POWER detection section through an operational amplifier and transistors, and finally convert it into a current signal.

[0080] Among them, the operational amplifier △3 receives the common-mode signal from the POWER detection section and amplifies it through its non-inverting input terminal. The output signal of the operational amplifier will be converted into current through the transistor Q4. The inverting input terminal forms a negative feedback mechanism through the connection of the transistor Q5, ensuring the stable gain of the operational amplifier and preventing the output signal from being over-amplified or saturated. Negative feedback regulation is the key to maintaining system stability. Through the gain adjustment of the operational amplifier △3, it is ensured that the signal is effectively processed and ready for current conversion.

[0081] Transistor Q4 is responsible for converting the signal processed by the operational amplifier into current. Here, Q4 acts as a current switch or amplifier, converting 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.

[0082] Transistor Q5 serves 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 regulates the signal conversion process. Q5 adjusts the gain and ensures that the input signal of the operational amplifier is within a stable operating range, enabling the amplified signal to obtain an accurate current conversion when passing through Q4.

[0083] Transistor Q6 is connected to transistor Q4 and is responsible for transmitting the current generated by Q4 to the next-stage circuit, particularly the differential current synthesis unit. The role of Q6 is to further control the output current to ensure that the transmitted current meets the requirements of the next-stage circuit. The output of Q6 provides an appropriate current signal for the differential current synthesis unit to ensure that the unit can operate as required.

[0084] 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 operational amplifier △3 and the current control of transistor Q4. Through appropriate gain control and negative feedback, the entire current conversion process is stabilized and the signal accuracy is ensured. Through the cooperation of transistors Q4 and Q6, a current signal suitable for the differential current synthesis unit is finally formed.

[0085] Preferably, the differential current synthesis unit includes transistor Q7, transistor Q8, transistor Q11, and transistor Q12.

[0086] Specifically, transistor Q7 is connected to the common-mode component current conversion unit. Q7 receives the current signal from the common-mode component current conversion unit. Usually, this signal represents the current of the common-mode component. The main role 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.

[0087] More specifically, transistor Q8 is connected to the detection signal processing module and receives the current signal of this module. These current signals may be the results of signal amplification, adjustment, 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.

[0088] 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 forms a current feedback mechanism with Q7 and Q11 to control the current flow direction and stability.

[0089] More specifically, transistor Q11 is connected to transistors Q12 and Q8. Q11 and Q8 are connected in parallel with an external resistor Rext. Q11 is used in this circuit to output the common-mode component signal as the 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 by grounding.

[0090] More specifically, resistor Rext is connected in parallel with Q8 and Q11 and serves as a key part for 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.

[0091] It can be seen that the function of this differential current synthesis unit is to process and synthesize the input current signals (from the common-mode component current conversion unit and the detection signal processing module) through the combination of different transistors, and finally form a suitable feedback current signal.

[0092] Specifically, transistor Q7 receives the current signal from the common-mode component current conversion unit, mainly used to introduce the common-mode component current, and acts together with other transistors. It imports the common-mode current signal into the circuit of the differential current synthesis unit, preparing to combine with the signal from the detection signal processing module.

[0093] More specifically, transistor Q8 receives the converted current signals from the detection signal processing module. These signals are the regulated signal currents. Q8 is connected in parallel with transistor Q11 and the external resistor Rext, and outputs the converted current signal. The current of Q8 is combined with the output signal of Q11 to form a synthesized feedback current signal. Q8 acts as a current converter here. It not only outputs the current signal but also ensures the current regulation and feedback control through the parallel relationship with Q11.

[0094] More specifically, the role of transistor Q12 is to be connected to transistors Q7 and Q11 and grounded to form a current feedback loop. The connection method of Q12 helps to stabilize the current output and enables the current to flow correctly among 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.

[0095] More specifically, transistor Q11, as a key current output component, is responsible for outputting the common-mode component signal as the common-mode current. It receives the currents from Q12 and Q8 and controls the current flow direction to correctly output the signal. Q11 not only provides the common-mode signal output but also regulates the signal magnitude through the parallel configuration with Q8 and Rext. The role of Q11 is to ensure that the current output meets the requirements and operates stably.

[0096] More specifically, the resistor Rext is in parallel with Q8 and Q11, and its function is to adjust the magnitude of the output current. It restricts 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, thus guaranteeing the accuracy and stability of the synthesized current signal.

[0097] 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 and the converted current signal from the detection signal processing module. The two are synthesized into a suitable feedback current signal through the parallel combination of Q8 and Q11, and the synthesized signal will be output through the current feedback loop to form a stable feedback current signal.

[0098] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included within 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.

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