High-precision current segmentation detection signal reporting circuit
By setting up first and second segment current detection circuits, high-precision segmented current detection signal reporting was achieved, solving the problems of narrow detection range and low accuracy, expanding the detection range and improving the adaptability of the circuit.
Patent Information
- Application Number
- CN202422888095.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-25
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2034-11-25
AI Technical Summary
In high-precision current detection, existing technologies suffer from narrow detection range and low accuracy, especially in AC input power scenarios, where the upper limit of the reported voltage makes it difficult to achieve high-precision measurement.
The sampling current is processed in segments by employing a first segmented current detection circuit and a second segmented current detection circuit. The sampling current is detected and reported through bilinear current signal detection, which expands the detection range and improves accuracy. The structure is simple and adaptable to different voltage environments.
It achieves high-precision current detection over a wide range, with a broader detection range, flexibly adapting to different voltage environments, and improving the versatility and practicality of the circuit.
Smart Images
Figure CN223827730U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of power supply technology, specifically to a high-precision current segment detection signal reporting circuit. Background Technology
[0002] To achieve accurate detection of output and input current and report this data to the MCU or system as a current or power reference, a major challenge lies in achieving high-precision measurements due to limitations in the reported voltage. This is particularly true in AC input power scenarios, where higher voltage levels mean that larger errors in the input current will significantly increase the accuracy error in power reporting. While a simple differential amplification method can be used, the voltage limit that the DSP can withstand must be considered, and the sampling accuracy of current changes using this method is often insufficient.
[0003] Specifically, current detection circuits in current power supply designs currently have a significant problem: when the current value is large, due to the fixed amplification factor and the limitation imposed by the MCU supply voltage (usually 3V), the op-amp's output voltage is confined to the range of 0-3V. This not only results in a narrow detection range but also relatively low detection accuracy. Attempting to increase the sampling amplification factor to widen the detection range is then limited by the upper limit of the reported MCU voltage (such as 3V or 5V), leading to a significant drop in detection accuracy at low current levels. Utility Model Content
[0004] In order to overcome the problems of narrow detection range and low detection accuracy of current detection circuits in the prior art, this utility model provides a high-precision current segmented detection signal reporting circuit.
[0005] The technical solution of this utility model is as follows:
[0006] A high-precision current segment detection signal reporting circuit includes: a reporting MCU, a first segment current detection circuit, and a second segment current detection circuit;
[0007] The first segmented current detection circuit includes resistors R4, R5, and R6, capacitors C4 and C5. One end of resistor R6 is connected to one end of capacitor C5 and current detection point 1. The other end of resistor R6 is connected to one end of resistor R5 and one end of capacitor C4. The other ends of capacitor C4 and capacitor C5 are both grounded. The other end of resistor R5 is connected to the reporting MCU after passing through resistor R4.
[0008] The second segmented current detection circuit includes resistors R7, R8, R9, and R10, and capacitors C6 and C7. One end of resistor R10 is connected to one end of capacitor C7 and current detection point two. The other end of resistor R10 is connected to one end of resistor R9, one end of capacitor C6, and current detection point three. The other end of resistor R9 is connected to one end of resistor R8 and one end of resistor R7. The other ends of resistor R7, capacitor C6, and capacitor C7 are all grounded. The other end of resistor R8 is connected to the reporting MCU.
[0009] As a preferred embodiment of this utility model, the second segmented current detection circuit further includes a dual diode assembly. The first end of the dual diode assembly is connected to one end of the resistor R5, one end of the resistor R6, and one end of the capacitor C4, respectively. The second end of the dual diode assembly is connected to one end of the resistor R9, one end of the resistor R10, one end of the capacitor C6, and the current detection point, respectively. The third end of the dual diode assembly is connected to the first power supply voltage.
[0010] As a preferred embodiment of this utility model, the dual diode assembly consists of two diodes connected in parallel.
[0011] In a preferred embodiment of this utility model, pin 6 of the reporting MCU is connected to one end of resistor R8 and one end of resistor R4 respectively.
[0012] As a preferred embodiment of this utility model, it further includes: a resistor R1 and a capacitor C1, one end of the resistor R1 is connected to the second power supply voltage, the other end of the resistor R1 is connected to one end of the capacitor C1 and pin 3 of the reporting MCU, and the other end of the capacitor C1 is grounded.
[0013] As a preferred embodiment of this utility model, pins 1 and 2 of the reporting MCU are grounded.
[0014] As a preferred embodiment of this utility model, it further includes: a resistor R3 and a capacitor C3, one end of the resistor R3 is connected to a ground point, the other end of the resistor R3 is connected to one end of the capacitor C3 and pin 4 of the reporting MCU, and the other end of the capacitor C3 is grounded.
[0015] As a preferred embodiment of this utility model, it further includes a resistor R2, a capacitor C2 and a resistor RS. One end of the resistor R2 is connected to one end of the capacitor C2 and pin 5 of the reporting MCU, and the other end of the resistor R2 is connected to one end of the resistor RS. The other ends of the capacitor C2 and the other ends of the resistor RS are both grounded.
[0016] As a preferred embodiment of this utility model, it further includes: a third segmented current detection circuit, which has the same structure as the second segmented current detection circuit and is connected to the reporting MCU.
[0017] As a preferred embodiment of this utility model, it further includes: a fourth segment current detection circuit, which has the same structure as the second segment current detection circuit and is connected to the reporting MCU.
[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:
[0019] The high-precision current segment detection signal reporting circuit provided by this utility model segments the sampled current by setting a first segment current detection circuit and a second segment current detection circuit to achieve bilinear current signal detection and reporting, so as to meet the requirements of high accuracy detection over a wide range. Moreover, it has a simple structure and a wider detection range, and is no longer limited to the voltage requirements of the reporting MCU, so it can be applied more flexibly to different voltage environments, improving the versatility and practicality of the circuit. Attached Figure Description
[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0021] Figure 1 This is a block diagram illustrating the principle of a high-precision current segment detection signal reporting circuit in one embodiment of the present invention.
[0022] Figure 2 This is a circuit diagram of a high-precision current segment detection signal reporting circuit in one embodiment of the present invention;
[0023] Figure 3 This is a block diagram of the high-precision current segment detection signal reporting circuit in another embodiment of the present invention;
[0024] Figure 4 This is a block diagram of the high-precision current segment detection signal reporting circuit in another embodiment of the present invention. Detailed Implementation
[0025] To make the technical problem to be solved, the technical solution, and the beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be noted that similar reference numerals and letters in the following drawings indicate similar items; therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. It is also declared that the embodiments described below are only for explaining this utility model and are not intended to limit this utility model.
[0026] It should be noted that the terms "installation," "setting," "connection," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components, unless otherwise explicitly defined. The terms "first," "second," "third," and "fourth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or specifying the number of technical features.
[0027] Please see Figure 1 , Figure 2 This embodiment provides a high-precision current segment detection signal reporting circuit, including: a reporting MCU1, a first segment current detection circuit 2, and a second segment current detection circuit 3.
[0028] The first segment current detection circuit 2 includes resistors R4, R5, and R6, capacitors C4 and C5. One end of resistor R6 is connected to one end of capacitor C5 and current detection point IIN_1, and the other end of resistor R6 is connected to one end of resistor R5 and one end of capacitor C4. The other ends of capacitors C4 and C5 are both grounded. The other end of resistor R5 is connected to pin 6 of the reporting MCU1 after passing through resistor R4.
[0029] The second segmented current detection circuit 3 includes resistors R7, R8, R9, and R10, capacitors C6 and C7, and a dual diode assembly. One end of resistor R10 is connected to one end of capacitor C7 and current detection point IIN_2. The other end of resistor R10 is connected to one end of resistor R9, one end of capacitor C6, the second end of the dual diode assembly, and current detection point IIN_3. The other end of resistor R9 is connected to one end of resistor R8 and one end of resistor R7. The other ends of resistor R7, capacitor C6, and capacitor C7 are all grounded. The other end of resistor R8 is connected to pin 6 of the reporting MCU1. The first end of the dual diode assembly is connected to one end of resistor R5, one end of resistor R6, and one end of capacitor C4. The third end of the dual diode assembly is connected to the first power supply voltage.
[0030] Wherein, the amplified voltage V1 of current detection point one IIN_1 = the voltage V2 of current sampling × the amplification factor N, and the amplified voltage V3 of current detection point two IIN_2 = (the voltage V2 of current sampling × the amplification factor N) / (R8 + R7) × R7. Comparing the amplified voltage V3 of current detection point two IIN_2 and the amplified voltage V1 of current detection point one IIN_1, it can be seen that the voltage detection accuracy of current detection point two IIN_2 is greater than that of current detection point one IIN_1.
[0031] The high-precision current segment detection signal reporting circuit of this embodiment segments the sampled current by setting a first segment current detection circuit 2 and a second segment current detection circuit 3 to achieve bilinear current signal detection and reporting, so as to meet the requirements of high accuracy detection over a wide range. It has a simple structure and a wider detection range, and is no longer limited to the 3V / 5V voltage requirement of reporting MCU1. Therefore, it can be applied more flexibly to different voltage environments, improving the versatility and practicality of the circuit.
[0032] When the current detection point IIN_1 of the first segmented current detection circuit 2 is used for reporting, a detection range of 0-3V / 5V can be achieved. Within the 0-3V / 5V detection range, the detection accuracy in the low current range is improved by referring to the current detection point IIN_2 of the second segmented current detection circuit 3.
[0033] When detecting high current, the current detection points IIN_2 and IIN_3 of the second segmented current detection circuit 3 are used for detection, and the RC can be adjusted to detect peak and average values to ensure high-precision detection requirements.
[0034] The high / low current segmentation and sampling point selection are determined by the highest power supply of the reporting MCU1 and the resistance values of resistors R7 and R8, providing flexibility and scalability in circuit design. By adjusting these parameters, circuit performance can be optimized to meet different application requirements.
[0035] Please see Figure 2 In this embodiment, the dual-diode assembly consists of two diodes connected in parallel.
[0036] Please see Figure 2In this embodiment, the high-precision current segment detection signal reporting circuit further includes: resistors R1, R2, and R3, capacitors C1, C2, and C3, and resistor RS. One end of resistor R1 is connected to the second power supply voltage, and the other end of resistor R1 is connected to one end of capacitor C1 and pin 3 of reporting MCU1. One end of resistor R3 is connected to the ground point, and the other end of resistor R3 is connected to one end of capacitor C3 and pin 4 of reporting MCU1. One end of resistor R2 is connected to one end of capacitor C2 and pin 5 of reporting MCU1, and the other end of resistor R2 is connected to one end of resistor RS. Pins 1 and 2 of reporting MCU1, the other end of capacitor C1, the other end of capacitor C2, the other end of capacitor C3, and the other end of resistor RS are all grounded. Capacitors C1, C2, and C3 serve as filter capacitors, helping to smooth voltage fluctuations on power and signal lines, reduce noise interference, and improve circuit stability and reliability. Resistors R1, R2, and R3 are connected to the pins of the MCU1 and are used in a voltage divider circuit to provide the MCU with reference voltages or signals of different levels. Resistor RS serves as a current-limiting or protective resistor, used to limit the current flowing into the MCU or other sensitive components, preventing damage to components due to excessive current.
[0037] Please see Figure 3 In one embodiment, the high-precision segmented current detection signal reporting circuit further includes a third segmented current detection circuit, which has the same structure as the second segmented current detection circuit 3 and is connected to pin 6 of the reporting MCU1. By setting the first segmented current detection circuit 2, the second segmented current detection circuit 3, and the third segmented current detection circuit, trilinear current signal detection and reporting can be achieved.
[0038] Please see Figure 4 In one embodiment, the high-precision current segment detection signal reporting circuit may further include a fourth segment current detection circuit, which has the same structure as the second segment current detection circuit 3 and is connected to pin 6 of the reporting MCU1. By setting the first segment current detection circuit 2, the second segment current detection circuit 3, the third segment current detection circuit, and the fourth segment current detection circuit, four linear current signal detection and reporting can be achieved. Of course, the high-precision current segment detection signal reporting circuit may also include more segment current detection circuits with the same structure as the second segment current detection circuit 3 to achieve more linear current signal detection and reporting; this utility model does not limit this.
[0039] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.
[0040] The present utility model patent has been described above with reference to the accompanying drawings. Obviously, the implementation of the present utility model patent is not limited to the above-described manner. Any improvements made by adopting the inventive concept and technical solution of the present utility model patent, or the direct application of the inventive concept and technical solution of the present utility model patent to other occasions without modification, are all within the protection scope of the present utility model.
Claims
1. A high-precision current segmentation detection signal reporting circuit, characterized in that, include: Report to the MCU, the first segment current detection circuit, and the second segment current detection circuit; The first segmented current detection circuit includes resistors R4, R5, and R6, capacitors C4 and C5. One end of resistor R6 is connected to one end of capacitor C5 and current detection point 1. The other end of resistor R6 is connected to one end of resistor R5 and one end of capacitor C4. The other ends of capacitor C4 and capacitor C5 are both grounded. The other end of resistor R5 is connected to the reporting MCU after passing through resistor R4. The second segmented current detection circuit includes resistors R7, R8, R9, and R10, and capacitors C6 and C7. One end of resistor R10 is connected to one end of capacitor C7 and current detection point two. The other end of resistor R10 is connected to one end of resistor R9, one end of capacitor C6, and current detection point three. The other end of resistor R9 is connected to one end of resistor R8 and one end of resistor R7. The other ends of resistor R7, capacitor C6, and capacitor C7 are all grounded. The other end of resistor R8 is connected to the reporting MCU.
2. The high-precision current segmented detection signal reporting circuit according to claim 1, characterized in that, The second segmented current detection circuit also includes a dual diode assembly. The first end of the dual diode assembly is connected to one end of the resistor R5, one end of the resistor R6 and one end of the capacitor C4, respectively. The second end of the dual diode assembly is connected to one end of the resistor R9, one end of the resistor R10, one end of the capacitor C6 and the current detection point, respectively. The third end of the dual diode assembly is connected to the first power supply voltage.
3. The high-precision current segmented detection signal reporting circuit according to claim 2, characterized in that, The dual-diode assembly consists of two diodes connected in parallel.
4. The high-precision current segmented detection signal reporting circuit according to claim 1, characterized in that, Pin 6 of the reporting MCU is connected to one end of resistor R8 and one end of resistor R4, respectively.
5. The high-precision current segmentation detection signal reporting circuit according to claim 1, characterized in that, Also includes: The resistor R1 and capacitor C1 are connected together. One end of the resistor R1 is connected to the second power supply voltage, and the other end of the resistor R1 is connected to one end of the capacitor C1 and pin 3 of the reporting MCU. The other end of the capacitor C1 is grounded.
6. The high-precision current segmentation detection signal reporting circuit according to claim 1, characterized in that, The MCU's pins 1 and 2 are grounded.
7. The high-precision current segmentation detection signal reporting circuit according to claim 1, characterized in that, Also includes: The resistor R3 and capacitor C3 are connected together. One end of the resistor R3 is connected to the ground point, and the other end of the resistor R3 is connected to one end of the capacitor C3 and pin 4 of the reporting MCU. The other end of the capacitor C3 is grounded.
8. The high-precision current segmented detection signal reporting circuit according to claim 1, characterized in that, It also includes a resistor R2, a capacitor C2, and a resistor RS. One end of the resistor R2 is connected to one end of the capacitor C2 and pin 5 of the reporting MCU. The other end of the resistor R2 is connected to one end of the resistor RS. The other ends of the capacitor C2 and the other ends of the resistor RS are both grounded.
9. The high-precision current segment detection signal reporting circuit according to claim 1, characterized in that, Also includes: The third segment current detection circuit has the same structure as the second segment current detection circuit and is connected to the reporting MCU.
10. The high-precision current segmentation detection signal reporting circuit according to claim 9, characterized in that, Also includes: The fourth segment current detection circuit has the same structure as the second segment current detection circuit and is connected to the reporting MCU.