Adjustable program-controlled dual-channel current measuring circuit

Abstract

The utility model discloses an adjustable program-controlled dual-channel current measuring circuit, which comprises a high-precision amplification module, an outrange indication module, a program-controlled switching module and a power supply module, and is characterized in that the power supply module is respectively connected with the high-precision amplification module, the outrange indication module and the program-controlled switching module; and the high-precision amplification module comprises two amplification circuits with the same structure. According to the utility model, a dual-channel independent design and a high-precision amplifier are adopted, and a multi-circle resistor and a program control mode are combined, so that high-precision amplification and flexible adjustment of a current signal are realized, and dynamic requirements in different application scenes can be met. The two signal channels are mutually independent, a user can carry out fine gain adjustment on each channel through an adjustable resistor, meanwhile, a precise matching compensation function is provided for the fine difference of different types of coils or loads, and signal consistency and high-precision processing between the channels are ensured.

Description

Technical Field

[0001] This utility model relates to the field of current detection technology, and in particular to an adjustable programmable dual-channel current measurement circuit. Background Technology

[0002] In the field of current signal measurement and processing, dual-channel current measurement circuits are core components in many electronic devices and measuring instruments. Their main applications include sensor signal processing: processing current signals from coils and amplifying or converting them into other readable signals. In automated testing and measurement systems, they are used to process the synchronous or independent amplification of multiple input signals.

[0003] Current dual-channel current measurement circuit designs mainly focus on the following key technology areas:

[0004] Dual-channel design: Traditional dual-channel current measurement circuits have relatively fixed parameters between channels, which cannot meet the requirements of measuring signal strength and high precision.

[0005] Gain Adjustment and Compensation: Traditional dual-channel current measurement circuits typically use mechanical potentiometers or fixed resistors to set the channel gain, resulting in a relatively simple gain adjustment method. Existing technologies have limited accuracy in compensating for differences in coil parameters, leading to complex adjustments and low precision.

[0006] Indication capability: Most devices lack real-time over-range indication function, making it difficult to quickly provide feedback on the circuit's operating status.

[0007] Although existing technologies have met the basic requirements for dual-channel current signal processing to some extent, there are still significant shortcomings:

[0008] Poor adjustment flexibility and channel independence: Existing circuits are mostly global adjustments, which cannot independently adjust the two channels, limiting high-precision application scenarios.

[0009] Lack of overrange feedback: The lack of a fast and intuitive overrange feedback mechanism makes it difficult for the circuit to respond in a timely manner when it is overloaded.

[0010] The signal quality is not stable enough: the filter design is simple and it is difficult to effectively suppress noise and high-frequency interference.

[0011] Limited applicability: It is difficult to adapt to various differences in coil parameters. Utility Model Content

[0012] In order to overcome the shortcomings of the prior art, this application proposes an adjustable programmable dual-channel current measurement circuit to solve the problems existing in the prior art.

[0013] To solve the above-mentioned technical problems, this utility model provides the following technical solution:

[0014] An adjustable programmable dual-channel current measurement circuit includes a high-precision amplification module, an over-range indication module, a programmable switching module, and a power supply module. The power supply module is connected to the high-precision amplification module, the over-range indication module, and the programmable switching module. The high-precision amplification module includes two identical amplification circuits. One amplification circuit includes chip U1, chip U2, resistor R3, resistor R14, and capacitor C1. Pin 2 of chip U1 is connected to the input terminal HIGH_IN-, resistor R3, resistor R38, and resistor R66. Pin 3 of chip U1 is connected to capacitors C1, C2, C3, and C25, and the input terminal HI. GH_IN+, diode D1, resistors R73 and R71. The other end of resistor R71 is connected to the other end of resistor R73 and resistor R63. The other end of resistor R3 is connected to resistors R60 and R14. The other end of resistor R14 is connected to capacitor C120 and pin 6 of chip U2. The other end of capacitor C120 is connected to resistor R13 and pin 2 of chip U2. Pin 3 of chip U2 is connected to resistors R11 and R12. The other end of resistor R11 is connected to capacitors C56, C59, C58 and pin 6 of chip U1. The other end of capacitor C56 is connected to the other ends of capacitors C59 and C58 and the other end of resistor R38. The other end of resistor R12 is grounded, and the other end of resistor R13 is grounded. Chips U1 and U2 are of model OPA828IDR.

[0015] As a further technical solution of this utility model: the overrange indication module includes two voltage comparator LM311 DR chips and an indicator light.

[0016] As a further technical solution of this utility model: the programmable switching module includes an optocoupler chip U20, transistors Q1 and Q2, and a MOSFET Q3. Pin 1 of the optocoupler chip U20 is connected to resistor R17, and resistor R17 is connected to the power supply VCC. Pin 2 of the optocoupler chip U20 is connected to interface P1. Pin 3 of the optocoupler chip U20 is connected to resistor R18 and the gate of MOSFET Q3. Pin 4 of the optocoupler chip U20 is connected to indicator lights HI GH_X. The other end of GH_X is connected to resistor R52, and the other end of resistor R52 is connected to power supply VCC. The source of MOSFET Q3 is connected to the other end of resistor R18 and ground. The drain of MOSFET Q3 is connected to resistors R19, R30, and R39. The other end of resistor R30 is connected to resistor R31 and the base of transistor Q1. The other end of resistor R39 is connected to resistor R40 and the base of transistor Q2. The collector of transistor Q2 is connected to indicator light LOW_X. The emitter of transistor Q2 is connected to the emitter of transistor Q1, the other end of resistor R31, the other end of resistor R40, and ground.

[0017] As a further technical solution of this utility model: the optocoupler chip U20 is model number EL357N.

[0018] As a further technical solution of this utility model: the power supply module provides a stable power supply of +10V and -10V, and stabilizes the power supply and suppresses noise through filter capacitor C30, capacitor C34 and low-noise voltage regulator chip LT1964ES5-BYP.

[0019] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0020] This invention achieves high-precision amplification and flexible adjustment of current signals by employing a dual-channel independent design and a high-precision amplifier, combined with multi-turn resistors and programmable control, meeting the dynamic needs of various application scenarios. The two signal channels are independent, allowing users to finely adjust the gain of each channel via adjustable resistors. It also provides precise matching compensation for subtle differences in different types of coils or loads, ensuring signal consistency and high-precision processing between channels. The programmable control function allows for remote control via digital signals, enabling automated operation. By designing a real-time over-range indication function, this invention can quickly detect and report whether the signal exceeds the safe range, protecting the circuit and external equipment from overload damage and improving the overall system safety and reliability. Furthermore, the optimized filter circuit design significantly improves anti-interference capability and signal stability, reducing the impact of external noise on measurement accuracy. This invention possesses high adaptability and wide applicability, suitable not only for sensor signal processing, precision measurement, and laboratory instruments, but also for meeting the needs of flexible adjustment and high precision in automated testing systems, thereby significantly improving work efficiency, ease of operation, and equipment lifespan, and significantly enhancing the reliability and application value of the equipment. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a high-precision amplification module;

[0022] Figure 2 This is a schematic diagram of the over-range indication module;

[0023] Figure 3 This is a schematic diagram of the programmable switching module;

[0024] Figure 4 This is a schematic diagram of the power module;

[0025] Figure 1 In the middle: 1-Adjustable resistor module, 2-Adjustable resistor module. Detailed Implementation

[0026] The technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] like Figure 1-4 As shown, an adjustable programmable dual-channel current measurement circuit includes a high-precision amplification module, an over-range indication module, a programmable switching module, and a power supply module. The power supply module is connected to the high-precision amplification module, the over-range indication module, and the programmable switching module. The high-precision amplification module includes two identical amplification circuits. One amplification circuit includes chip U1, chip U2, resistor R3, resistor R14, and capacitor C1. Pin 2 of chip U1 is connected to the input terminal HIGH_I N-, resistor R3, resistor R38, and resistor R66. Pin 3 of chip U1 is connected to capacitors C1, C2, C3, and C25, and the input terminal HIGH_I. N+, diode D1, resistors R73 and R71, the other end of resistor R71 is connected to the other end of resistor R73 and resistor R63, the other end of resistor R3 is connected to resistor R60 and resistor R14, the other end of resistor R14 is connected to capacitor C120 and pin 6 of chip U2, the other end of capacitor C120 is connected to resistor R13 and pin 2 of chip U2, pin 3 of chip U2 is connected to resistors R11 and R12, the other end of resistor R11 is connected to capacitors C56, C59, C58 and pin 6 of chip U1, the other end of capacitor C56 is connected to the other end of capacitor C59, the other end of capacitor C58 and the other end of resistor R38, the other end of resistor R12 is grounded, the other end of resistor R13 is grounded, and the model of chip U1 and chip U2 is OPA828 IDR.

[0028] The over-range indication module includes two LM311 DR voltage comparator chips and indicator lights. The programmable switching module includes an optocoupler chip U20, transistors Q1 and Q2, and a MOSFET Q3. Pin 1 of the optocoupler chip U20 is connected to resistor R17, which is connected to the power supply VCC. Pin 2 of the optocoupler chip U20 is connected to interface P1. Pin 3 of the optocoupler chip U20 is connected to resistor R18 and the gate of MOSFET Q3. Pin 4 of the optocoupler chip U20 is connected to indicator lights HIGH_X and HI... The other end of GH_X is connected to resistor R52, and the other end of resistor R52 is connected to power supply VCC. The source of MOSFET Q3 is connected to the other end of resistor R18 and ground. The drain of MOSFET Q3 is connected to resistors R19, R30, and R39. The other end of resistor R30 is connected to resistor R31 and the base of transistor Q1. The other end of resistor R39 is connected to resistor R40 and the base of transistor Q2. The collector of transistor Q2 is connected to indicator light LOW_X. The emitter of transistor Q2 is connected to the emitter of transistor Q1, the other end of resistor R31, the other end of resistor R40, and ground. The optocoupler chip U20 is model EL357N.

[0029] The power module provides stable +10V and -10V power supplies, and stabilizes the power supply and suppresses noise through filter capacitors C30 and C34 and the low-noise voltage regulator chip LT1964ES5-BYP.

[0030] The working principle is as follows:

[0031] The circuit uses a high-precision amplifier as its core, combined with a dual-channel design, adjustable resistors, and a programmable switching circuit. Through optimized circuit design, it achieves amplification and precise adjustment of the dual-channel signals. Measurement channels can be switched according to different measurement ranges and testing accuracy requirements. The signal strength of the two signals can be adjusted independently, and channel switching can be dynamically achieved through programmable control. An over-range monitoring circuit detects signal strength in real time, triggering an over-range indication when the signal exceeds the safe range, ensuring safe circuit operation.

[0032] The main components of this invention include:

[0033] Input terminal module: Includes two independent signal input terminals (HIGH_IN, LOW_IN), used to connect two current signals respectively. Each terminal is equipped with an RC matching circuit to reduce interference and attenuation of the input signal.

[0034] High-precision amplification module: Includes two sets of high-performance operational amplifiers (OPA828IDR) for high-precision amplification of the input signal. The amplification gain can be adjusted via an external resistor network to meet the processing requirements of different signal strengths.

[0035] Adjustable resistors: Each signal channel is equipped with a set of adjustable resistors (multi-turn potentiometers) for independent and fine adjustment of the amplification gain. By adjusting the resistor values, signal mismatch caused by coil differences can be compensated.

[0036] Power supply module: Provides stable +10V and -10V power to ensure the normal operation of the amplifier and other components. Power supply stabilization and noise suppression are achieved through filter capacitors (10uF, 100nF) and a low-noise voltage regulator chip (LT1964ES5-BYP).

[0037] Over-range indication module: Includes a voltage comparator (LM311 DR) and indicator lights for real-time monitoring of the output signal strength. When the signal current or voltage exceeds the safe range, the indicator light illuminates, reminding the user to adjust the input or stop operation in time.

[0038] Programmable switching module: Provides a programmable interface for receiving external control signals and dynamically adjusting the circuit's operating state. Supports digital input of control parameters, facilitating integration into automation systems.

[0039] The connections, positions, and interactions between the components:

[0040] Amplification modules and adjustable resistors: The gain of each amplification module is determined by its corresponding adjustable resistor. The two sets of adjustable resistors are independent of each other, ensuring independent adjustment capability for both signals. The adjustable resistors are placed in the amplifier's feedback path, and the amplification factor is adjusted by changing the feedback impedance.

[0041] Power supply module and the entire circuit: The power supply module provides stable +10V and -10V power to the amplification module, over-range indicator module, and other critical components. The power supply is connected to each module through filtering components to ensure the low-noise characteristics of the circuit.

[0042] Over-range indicator module: The over-range indicator module monitors the output signal strength in real time through a voltage comparator. When the signal strength exceeds the set threshold, the indicator light is triggered to remind the user that the signal is overloaded.

[0043] Workflow:

[0044] Two input signals are connected from the input terminals (HIGH_IN and LOW_IN) respectively, and enter the corresponding amplification modules after RC matching.

[0045] The amplification module amplifies the signal independently based on the adjustable resistor value in the feedback path, and the amplification factor can be adjusted via a programmable interface or manually.

[0046] The amplified signal is sent to the output terminals (HIGH_OUT, LOW_OUT) and is simultaneously monitored in real time by the over-range indicator module.

[0047] If the signal exceeds the safe range, the over-range indicator module will trigger the indicator light to illuminate, reminding the user to take appropriate measures.

[0048] The programmable switching module can receive external digital signals to switch channels.

[0049] Experimental results:

[0050] 1) When there are differences in impedance or magnetic flux of the adapter coil, the measured values ​​will vary greatly. Adjust the adapter coil by adjusting the adjustable resistor module.

[0051] 2) During the current signal measurement process, the measured signal often exceeds the measured value of the measuring equipment. When using an adjustable programmable dual-channel current measurement circuit, the indicator light will illuminate when the measured signal exceeds the limit, reminding the user to adjust the input or stop the operation in time.

[0052] When measuring different current signals, the strength of the measured signal varies. When measuring weaker current signals, using a lower setting can improve the accuracy of the test. When measuring stronger current signals, it is necessary to switch to a higher setting. The programmable switch makes this more convenient, especially in automated testing.

[0053] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention.

[0054] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This way of describing the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment have been appropriately combined to form other embodiments that are easy for those skilled in the art to understand.

Claims

1. An adjustable programmable dual-channel current measurement circuit, comprising a high-precision amplification module, an over-range indication module, a programmable switching module, and a power supply module, characterized in that: The power supply module is connected to the high-precision amplification module, the over-range indication module, and the programmable switching module. The high-precision amplification module contains two identical amplification circuits. One amplification circuit includes chip U1, chip U2, resistor R3, resistor R14, and capacitor C1. Pin 2 of chip U1 is connected to the input terminal HIGH_IN-, resistor R3, resistor R38, and resistor R66. Pin 3 of chip U1 is connected to capacitor C1, capacitor C2, capacitor C3, capacitor C25, the input terminal HIGH_IN+, diode D1, resistor R73, and resistor R71. The other end of resistor R71 is connected to the other end of resistor R73 and resistor R63. The other end of resistor R3 is connected to resistors R60 and R14. The other end of resistor R14 is connected to capacitor C120 and pin 6 of chip U2. The other end of capacitor C120 is connected to resistor R13 and pin 2 of chip U2. Pin 3 of chip U2 is connected to resistors R11 and R12. The other end of resistor R11 is connected to capacitors C56, C59, and C58 and pin 6 of chip U1. The other end of capacitor C56 is connected to the other ends of capacitors C59 and C58 and the other end of resistor R38. The other end of resistor R12 is grounded, and the other end of resistor R13 is grounded. Chips U1 and U2 are of model OPA828IDR.

2. The adjustable programmable dual-channel current measurement circuit according to claim 1, characterized in that, The overrange indication module includes two voltage comparator LM311DR chips and an indicator light.

3. The adjustable programmable dual-channel current measurement circuit according to claim 1, characterized in that, The programmable switching module includes an optocoupler chip U20, transistors Q1 and Q2, and a MOSFET Q3. Pin 1 of the optocoupler chip U20 is connected to resistor R17, which is connected to the power supply VCC. Pin 2 of the optocoupler chip U20 is connected to interface P1. Pin 3 of the optocoupler chip U20 is connected to resistor R18 and the gate of the MOSFET Q3. Pin 4 of the optocoupler chip U20 is connected to indicator light HIGH_X. The other end of indicator light HIGH_X is connected to resistor R52, and the other end of resistor R52 is connected to the power supply VCC. CC, the source of MOSFET Q3 is connected to the other end of resistor R18 and ground. The drain of MOSFET Q3 is connected to resistors R19, R30 and R39. The other end of resistor R30 is connected to resistor R31 and the base of transistor Q1. The other end of resistor R39 is connected to resistor R40 and the base of transistor Q2. The collector of transistor Q2 is connected to indicator light LOW_X. The emitter of transistor Q2 is connected to the emitter of transistor Q1, the other end of resistor R31, the other end of resistor R40 and ground.

4. The adjustable programmable dual-channel current measurement circuit according to claim 3, characterized in that, The optocoupler chip U20 is model EL357N.

5. The adjustable programmable dual-channel current measurement circuit according to claim 1, characterized in that, The power module provides stable +10V and -10V power supplies, and stabilizes the power supply and suppresses noise through filter capacitors C30 and C34 and a low-noise voltage regulator chip LT1964ES5-BYP.

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