A combined time-shared display controller utilizing ac sampling
By using AC sampling technology and digital calculation, the circuit structure of the combined synchronous display controller is simplified, the sampling accuracy and anti-interference capability are improved, and the problems of multiple sampling channels and high hardware redundancy in the existing technology are solved, realizing the reliability and flexibility of synchronous inspection and electrical parameter measurement.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HANGZHOU GUOWANG TECH
- Filing Date
- 2026-07-01
- Publication Date
- 2026-08-04
AI Technical Summary
Existing combined synchronous display controllers have a large number of sampling channels, high hardware circuit redundancy, low sampling accuracy, insufficient anti-interference capability, and are difficult to adapt to flexible adjustments under different power grid environments.
Using AC sampling technology, only the AB phase line voltage on the machine side, the C phase current on the machine side, and the AB phase voltage on the system side need to be collected. The microprocessor performs digital calculations, and combined with RC filtering and a unified bias reference, the circuit structure is simplified, enabling synchronization checks and electrical parameter measurements.
It achieves simplified circuit structure, high sampling accuracy, strong anti-interference capability, ensures accurate synchronization judgment, reduces equipment cost and failure rate, and improves the reliability and flexibility of electrical parameter measurement.
Smart Images
Figure CN224595235U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of combined synchronous display and control technology, specifically a combined synchronous display and control that utilizes AC sampling. Background Technology
[0002] Existing combined synchronizing controllers, in order to achieve synchronization and parallel operation between generators and the power grid and to measure electrical parameters, typically require the simultaneous acquisition of multiple voltage and current signals, including three-phase voltage, three-phase current, and even zero-sequence components. This results in a large number of sampling channels, complex configurations of current transformers and sampling circuits, high redundancy in the overall hardware circuitry, and difficulty in reducing equipment size and production costs. Current technologies often rely on numerous analog computing circuits and hardware comparison circuits to perform signal conditioning and synchronization parameter calculations. This leads to complex circuit structures, increased potential points of failure, and fixed hardware circuit parameters, making it difficult to adapt flexibly to different power grid environments. Existing sampling circuits typically perform independent level conversion and isolation for each signal, lacking a unified bias reference. This easily leads to potential drift and inconsistencies in the reference between signals, directly affecting sampling accuracy and the reliability of synchronization judgment. Furthermore, existing filtering circuit designs are often complex or insufficiently effective. In environments with high power grid harmonic content or strong electromagnetic interference, the sampled signals are prone to distortion, causing deviations in the calculation of key synchronization parameters such as frequency difference, voltage difference, and phase angle difference, posing safety hazards to grid connection operations. Utility Model Content
[0003] The technical problem to be solved by this utility model is to provide a combined synchronizing display and control unit that uses AC sampling. It adopts AC sampling technology and only needs to collect the AB phase line voltage on the machine side, the C phase current on the machine side, and the AB phase voltage on the system side. The sampling circuit only needs to condition the input signal to the 0-3.3V voltage range that the processor can recognize to realize the functions of synchronization check and electrical parameter measurement.
[0004] This utility model is achieved through the following technical solution: A combined synchronous display and control unit utilizing AC sampling of this utility model includes a current sampling circuit and a first voltage sampling circuit connected to the machine side, a second voltage sampling circuit connected to the system side, and a microprocessor. The microprocessor includes a first set of synchronous sampling AD ports and a second set of synchronous sampling AD ports. The current sampling circuit and the first voltage sampling circuit are connected to the first set of synchronous sampling AD ports, the first voltage sampling circuit is connected to the second set of synchronous sampling AD ports, and the second voltage sampling circuit is connected to the second set of synchronous sampling AD ports.
[0005] In a further technical solution, one side of the current sampling circuit is connected to the organic terminal C-phase current.
[0006] A further technical solution involves connecting the AB phase line voltage of the organic terminal side to one side of the first voltage sampling circuit.
[0007] In a further technical solution, the AB phase line voltage of the system is connected to one side of the second voltage sampling circuit.
[0008] A further technical solution involves embedding existing technology programs into the processor to implement the synchronization function and electrical parameter measurement function, as follows: The first step is to connect the C-phase current and AB-phase line voltage on the machine side to the first set of synchronous sampling AD ports of the processor. The AD sampling rate is 1kHz, and a ring buffer is used to buffer the two sets of data. The second step involves extracting the most recent 64 measurement data points, performing windowing operations and Fast Fourier Transform (FFT) sequentially, and then using a three-point correction algorithm on the transform results to calculate the amplitude (A1, A2), frequency (F1, F2), and phase (φ1) of the sampled signal. The signal amplitudes are current (A1) and voltage (A2), and the product of the two signal amplitudes is the apparent power S (S=A1). A2), the cosine of the phase is the power factor (Cosφ1), and the apparent power multiplied by the power factor equals the active power P (P=S Cosφ1), the apparent power multiplied by the sine of the phase is equal to the reactive power Q (Q=S Sinφ1), with a frequency F value of (F=F1=F2), thus realizing the function of measuring electrical parameters.
[0009] The third step involves connecting the AB phase line voltages on the machine side and the AB phase line voltages on the system side to the second set of synchronous sampling AD ports of the processor. The amplitude (A3, A4), frequency (F3, F4), and phase (φ2) of the two signals are obtained through the same processing method. This yields the machine side voltage Vg (Vg=A3), the system side voltage Vs (Vs=A4), the voltage difference Vd (Vd=|A3-A4|), the machine side frequency Fg (Fg=F3), the system frequency Fs (Fs=F4), the frequency difference Fd (Fd=F3-F4), and the phase angle difference phi (phi=Δφ2), thus achieving the synchronization function.
[0010] The beneficial effects of this utility model are as follows: First, the combined synchronous display and controller of this utility model, which utilizes AC sampling, achieves the technical effects of simplified circuit structure, high sampling accuracy, strong anti-interference ability, accurate synchronization judgment, and electrical parameter measurement by simplifying the number of sampling channels, replacing part of the hardware circuit with digital calculations performed by a microprocessor, and combining RC filtering with a unified bias reference. This effectively overcomes the defects of existing synchronous display and controllers, such as circuit redundancy, hardware complexity, sampling drift, and insufficient anti-interference ability.
[0011] Second, only three signals are collected: the AB phase line voltage on the generator side, the C phase current on the generator side, and the AB phase voltage on the system side. The sampling circuit only needs to condition the input signal to the range of 0 to 3.3 volts that the microprocessor can process to realize the synchronization check function and electrical parameter measurement. This greatly reduces the number of sampling channels and transformer configuration, simplifies the circuit structure, and reduces equipment cost and failure rate. The controller completes the electrical parameter calculation through fast Fourier transform and three-point correction algorithm, replacing the traditional hardware calculation circuit, which improves the flexibility and accuracy of signal processing.
[0012] Third, after electrical isolation and signal conversion by the current transformer, the sampling signals of each channel are filtered out by the RC filter circuit composed of parallel resistors and capacitors to remove noise interference, and finally output a regular sampling signal. The overall circuit structure is simple, the filtering effect is reliable, and the anti-interference ability is strong. It can maintain high signal acquisition accuracy in the environment of power grid harmonics and electromagnetic interference, and ensure the accurate calculation of synchronous parameters and electrical parameters.
[0013] Fourth, a common bias voltage terminal is set to provide a unified bias reference potential for the three sampling circuits, so that the sampling signals of machine-side current, machine-side voltage, and system-side voltage have a stable reference potential. This avoids potential drift caused by inconsistent bias of each signal, ensures the measurement accuracy of synchronous parameters such as voltage difference, frequency difference, and phase angle difference, and ensures the measurement accuracy of electrical parameters such as voltage, current, frequency, phase, active power, reactive power, apparent power, and power factor. This improves the reliability of synchronous parallel operation and the accuracy of electrical parameter results.
[0014] Fifth, two sets of synchronous sampling AD ports are used to synchronously collect power parameters on the machine side and synchronization parameters between the machine side and the system side. The sampled data is processed by windowing operation and fast Fourier transform, which can accurately calculate electrical parameters such as voltage difference, frequency difference, phase angle difference, synchronization parameters, voltage, current, frequency, phase, active power, reactive power, apparent power and power factor. The synchronization function is digitized and intelligent, with fast calculation speed and timely parameter updates, meeting the requirements of real-time synchronization check and rapid measurement of electrical parameter data. Attached Figure Description
[0015] For ease of explanation, the present invention will be described in detail below with reference to specific embodiments and accompanying drawings.
[0016] Figure 1 This is a schematic diagram of the structure of a combined synchronous display and control unit based on existing technology. Figure 2 This is a schematic diagram of a combined synchronous display and control unit utilizing AC sampling according to this utility model; Figure 3 for Figure 2 A schematic diagram of a combined synchronous display controller that utilizes AC sampling. In the diagram, there are current transformer T1, first voltage transformer T2, second voltage transformer T3, first resistor R1, second resistor R2, third resistor R3, fourth resistor R4, fifth resistor R5, first capacitor C1, second capacitor C2, and third capacitor C3. Detailed Implementation
[0017] like Figures 1-3 As shown, this utility model will be described in detail. For ease of description, the directions mentioned below are defined as follows: the directions of up, down, left, right, front, and back mentioned below are the same as... Figure 1 The directions of the projection relationship are consistent in all directions: up, down, left, right, front, and back.
[0018] In Example 1, the current sampling circuit includes a current transformer T1. One side of the current transformer T1 is connected to the primary current circuit on the organic terminal side, and the other side is connected to the secondary circuit for first signal acquisition.
[0019] Advantageously, the primary current circuit on the machine side includes a current input terminal and a current output terminal. The current input terminal is connected to pin 2 of the current transformer T1, and pin 1 of the current transformer T1 is connected to the current output terminal.
[0020] Advantageously, the first signal acquisition secondary circuit includes a first capacitor C1 and a first resistor R1, the first group of synchronous sampling AD ports includes a signal output terminal CT_G and a common bias voltage terminal V_DIF, pin 4 of the current transformer T1 is simultaneously connected to one end of the first resistor R1, one end of the first capacitor C1 and the signal output terminal CT_G, and pin 3 of the current transformer T1 is simultaneously connected to the other end of the first resistor R1, the other end of the first capacitor C1 and the common bias voltage terminal V_DIF.
[0021] The first resistor R1 and the first capacitor C1 are connected in parallel to form an RC filter sampling circuit, which filters and samples the sampling signal output by the current transformer T1.
[0022] Example 2, based on Example 1, further defines the following: the first voltage sampling circuit includes a first voltage transformer T2, one side of the first voltage transformer T2 is connected to the primary side circuit of the organic terminal voltage, and the other side of the first voltage transformer T2 is connected to a second signal acquisition secondary circuit.
[0023] Advantageously, the primary circuit of the generator terminal voltage includes a second resistor R2, pin 2 of the first voltage transformer T2 is connected to the second resistor R2, the second resistor R2 is connected to the A-phase voltage of the generator terminal, and pin 1 of the first voltage transformer T2 is connected to the B-phase voltage of the generator terminal.
[0024] Advantageously, the second signal acquisition secondary circuit includes a second capacitor C2 and a third resistor R3, the second group of synchronous sampling AD ports includes a terminal voltage signal output terminal PT_G and a common bias voltage terminal V_DIF, pin 4 of the first voltage transformer T2 is simultaneously connected to one end of the third resistor R3, one end of the second capacitor C2 and the terminal voltage signal output terminal PT_G, and pin 3 of the first voltage transformer T2 is simultaneously connected to the other end of the third resistor R3, the other end of the second capacitor C2 and the common bias voltage terminal V_DIF.
[0025] The third resistor R3 and the second capacitor C2 are connected in parallel to form an RC filter sampling structure to achieve sampling, filtering and noise reduction of the terminal voltage sampling signal.
[0026] Example 3, based on Example 2, further defines the following: the second voltage sampling circuit includes a second voltage transformer T3, one side of the second voltage transformer T3 is connected to the primary side circuit of the system voltage, and the other side of the second voltage transformer T3 is connected to the secondary circuit of the third signal acquisition.
[0027] Advantageously, the primary circuit of the system voltage includes a fourth resistor R4, pin 2 of the second voltage transformer T3 is connected to the fourth resistor R4, the fourth resistor R4 is connected to the system A phase voltage, and pin 1 of the second voltage transformer T3 is connected to the system B phase voltage.
[0028] Advantageously, the third signal acquisition secondary circuit includes a third capacitor C3 and a fifth resistor R5, the second group of synchronous sampling AD ports includes a system voltage signal output terminal PT_S and a common bias voltage terminal V_DIF, pin 4 of the second voltage transformer T3 is simultaneously connected to one end of the fifth resistor R5, one end of the third capacitor C3 and the system voltage signal output terminal PT_S, and pin 3 of the second voltage transformer T3 is simultaneously connected to the other end of the fifth resistor R5, the other end of the third capacitor C3 and the common bias voltage terminal V_DIF.
[0029] The fifth resistor R5 and the third capacitor C3 are connected in parallel to form an RC filter sampling circuit, which completes the sampling and filtering processing of the system voltage sampling signal.
[0030] Example 4, based on Example 3, further specifies the following: the resistance values of the first resistor R1, the third resistor R3, and the fifth resistor R5 are all set to 510Ω; the second resistor R2 and the fourth resistor R4 are selected as 2W resistors with a resistance value of 68kΩ; the capacitance values of the first capacitor C1, the second capacitor C2, and the third capacitor C3 are all set to 0.01μF.
[0031] Advantageously, the common bias voltage terminal V_DIF is connected to the non-identical terminals on the secondary side of the current transformer T1, the first voltage transformer T2, and the second voltage transformer T3, respectively, to provide a unified bias reference potential for the three sampling circuits and ensure the stability of the output of each voltage and current sampling signal.
[0032] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions conceived without creative effort should be included within the protection scope of this utility model; therefore, the protection scope of this utility model should be determined by the scope defined in the claims.
Claims
1. A combined synchronous display and control unit utilizing AC sampling, comprising a current sampling circuit and a first voltage sampling circuit connected to the machine side, a second voltage sampling circuit connected to the system side, and a microprocessor, the microprocessor including a first set of synchronous sampling AD ports and a second set of synchronous sampling AD ports, characterized in that, The current sampling circuit and the first voltage sampling circuit are connected to the first group of synchronous sampling AD ports. The first voltage sampling circuit is connected to the second group of synchronous sampling AD ports. The second voltage sampling circuit is connected to the second group of synchronous sampling AD ports. One side of the current sampling circuit is connected to the C-phase current of the organic terminal. One side of the first voltage sampling circuit is connected to the AB-phase line voltage of the organic terminal. One side of the second voltage sampling circuit is connected to the AB-phase line voltage of the system.
2. The combined synchronous display and control unit utilizing AC sampling according to claim 1, characterized in that: The current sampling circuit includes a current transformer (T1), one side of which is connected to the primary current circuit on the organic terminal side, and the other side is connected to the secondary circuit for first signal acquisition.
3. A combined synchronous display and control unit utilizing AC sampling according to claim 2, characterized in that: The primary current circuit on the machine side includes a current input terminal and a current output terminal. The current input terminal is connected to pin 2 of the current transformer (T1), and pin 1 of the current transformer (T1) is connected to the current output terminal.
4. A combined synchronous display and control unit utilizing AC sampling according to claim 3, characterized in that: The first signal acquisition secondary circuit includes a first capacitor (C1) and a first resistor (R1). The first group of synchronous sampling AD ports includes a signal output terminal CT_G and a common bias voltage terminal V_DIF. Pin 4 of the current transformer (T1) is simultaneously connected to one end of the first resistor (R1), one end of the first capacitor (C1), and the signal output terminal CT_G. Pin 3 of the current transformer (T1) is simultaneously connected to the other end of the first resistor (R1), the other end of the first capacitor (C1), and the common bias voltage terminal V_DIF.
5. A combined synchronous display and control unit utilizing AC sampling according to claim 4, characterized in that: The first voltage sampling circuit includes a first voltage transformer (T2), one side of which is connected to the primary side circuit of the organic terminal voltage, and the other side of which is connected to a second signal acquisition secondary circuit.
6. A combined synchronous display and control unit utilizing AC sampling according to claim 5, characterized in that: The primary circuit of the generator terminal voltage includes a second resistor (R2). Pin 2 of the first voltage transformer (T2) is connected to the second resistor (R2). The second resistor (R2) is connected to the A-phase voltage of the generator terminal. Pin 1 of the first voltage transformer (T2) is connected to the B-phase voltage of the generator terminal.
7. A combined synchronous display and control unit utilizing AC sampling according to claim 6, characterized in that: The second signal acquisition secondary circuit includes a second capacitor (C2) and a third resistor (R3). The second set of synchronous sampling AD ports includes a terminal voltage signal output terminal PT_G and a common bias voltage terminal V_DIF. Pin 4 of the first voltage transformer (T2) is simultaneously connected to one end of the third resistor (R3), one end of the second capacitor (C2), and the terminal voltage signal output terminal PT_G. Pin 3 of the first voltage transformer (T2) is simultaneously connected to the other end of the third resistor (R3), the other end of the second capacitor (C2), and the common bias voltage terminal V_DIF.
8. A combined synchronous display and control unit utilizing AC sampling according to claim 5, characterized in that: The second voltage sampling circuit includes a second voltage transformer (T3), one side of which is connected to the primary voltage circuit of the system side, and the other side of which is connected to the secondary circuit of the third signal acquisition.
9. A combined synchronous display and control unit utilizing AC sampling according to claim 8, characterized in that: The primary circuit of the system voltage includes a fourth resistor (R4). Pin 2 of the second voltage transformer (T3) is connected to the fourth resistor (R4). The fourth resistor (R4) is connected to the A-phase voltage of the system. Pin 1 of the second voltage transformer (T3) is connected to the B-phase voltage of the system.
10. A combined synchronous display and control unit utilizing AC sampling according to claim 8, characterized in that: The third signal acquisition secondary circuit includes a third capacitor (C3) and a fifth resistor (R5). The second group of synchronous sampling AD ports includes a system voltage signal output terminal PT_S and a common bias voltage terminal V_DIF. Pin 4 of the second voltage transformer (T3) is simultaneously connected to one end of the fifth resistor (R5), one end of the third capacitor (C3), and the system voltage signal output terminal PT_S. Pin 3 of the second voltage transformer (T3) is simultaneously connected to the other end of the fifth resistor (R5), the other end of the third capacitor (C3), and the common bias voltage terminal V_DIF.