Tracking power signal digital-to-analog conversion system

Abstract

The utility model discloses a digital-to-analog conversion system for tracking power signals, which comprises an integrated electronic mutual inductor, the integrated electronic mutual inductor is in induction fit with a power transmission line cable, the output end of the integrated electronic mutual inductor is electrically connected with one input end of a signal differential summing circuit, and the output end of the signal differential summing circuit is electrically connected with the other input end of the signal differential summing circuit. The output end of the signal difference addition circuit is electrically connected with the input end of a quantizer, the output end of the quantizer is electrically connected with the input end of a signal processing module, the output end of the quantizer is connected with a signal feedback circuit in parallel, and the output end of the signal feedback circuit is electrically connected with the other input end of the signal difference addition circuit. According to the utility model, ultrahigh-precision signals can be converted, preconditions are provided for later signal analysis and prediction, and the digital-to-analog conversion device is utilized to weaken high-frequency electromagnetic wave noise in electric power signals.

Description

TECHNICAL FIELD

[0001] The utility model relates to power system signal acquisition conversion technical field, especially a kind of tracking power signal digital-analog conversion system. BACKGROUND

[0002] With the continuous development of digitalization and intelligentization of power system, the digital-analog conversion technology of power signal becomes one of the key technologies to realize power monitoring, control and protection.The conventional digital-analog conversion system faces the problems of low conversion accuracy, poor tracking effect and signal distortion, and there is an urgent need for a digital-analog conversion system that can effectively and accurately track power signals.

[0003] The development of power signal digital-analog conversion technology is constantly evolving with the progress of electronic technology, computer technology and communication technology.In the early power system, the collection and processing of power signals mainly rely on analog technology, which has the disadvantages of low precision and easy interference.With the rapid development of digital technology, the emergence of analog-to-digital converter (ADC) enables the collection and processing of power signals to be performed with higher precision and lower noise, thereby greatly improving the monitoring and control capabilities of the power system.The existing digital-analog conversion system, as shown in the "power distribution network cable operation data acquisition device" with application number CN202222678515.X, however, still has the problems of low conversion accuracy and the influence of high-frequency electromagnetic wave noise in power signals on detection. SUMMARY

[0004] The utility model provides a kind of tracking power signal digital-analog conversion system, to solve the problems of low conversion accuracy and the influence of high-frequency electromagnetic wave noise in power signals on detection in the prior art.

[0005] To solve the above technical problems, the utility model adopts the following technical solutions:

[0006] A kind of tracking power signal digital-analog conversion system, comprising integrated electronic mutual inductor, the integrated electronic mutual inductor is inducted with transmission line cable, the output of integrated electronic mutual inductor is electrically connected with the input of signal difference addition circuit, the output of signal difference addition circuit is electrically connected with the input of quantizer, the output of quantizer is electrically connected with signal processing module input, and the output of quantizer is connected with signal feedback circuit in parallel, the output of signal feedback circuit is electrically connected with the other input of signal difference addition circuit.

[0007] As preferably, the integrated electronic transformer comprises a plurality of electronic transformers connected in parallel with the input end of the signal differential addition circuit, and the plurality of electronic transformers are inductively matched with the same power transmission line cable.

[0008] As more preferably, the signal differential addition circuit respectively acquires two groups of signals, one group of signals from the integrated electronic transformer and the other group of signals from the signal feedback circuit, and the difference between the two groups of signals is output to the quantizer after being subtracted by the differential input link.

[0009] Further, the signal feedback circuit comprises a one-bit DAC and an integrator electrically connected, the input end of the one-bit DAC is electrically connected in parallel with the output end of the quantizer, the output end of the one-bit DAC is electrically connected with the input end of the integrator, and the output end of the integrator is electrically connected with the input end of the signal differential addition circuit.

[0010] Still further, the quantizer is a one-bit quantizer.

[0011] In particular, the quantizer comprises a zero-crossing comparator and a D flip-flop electrically connected, the output end of the signal differential addition circuit is electrically connected with the zero-crossing comparator, the output end of the zero-crossing comparator is electrically connected with the input end of the D flip-flop, and the output end of the D flip-flop is electrically connected with the signal processing module.

[0012] More particularly, the signal processing module comprises an FPGA chip integrated with an ARM processor.

[0013] In detail, the FPGA chip is integrated with an integrated signal circuit, an averaging circuit and a transceiver module respectively, the input end of the integrated signal circuit is electrically connected with the output end of the quantizer, the output end of the integrated signal circuit is electrically connected with the input end of the averaging circuit, the output end of the averaging circuit is electrically connected with the input end of the ARM processor, and the output end of the ARM processor is connected with each PC through the transceiver module to form signal transmission.

[0014] The utility model discloses a beneficial effect:

[0015] 1. The method provided by the utility model can realize conversion of ultra-high precision signals, and provides a prerequisite for signal analysis and prediction in the later stage.

[0016] 2. The utility model uses the digital-to-analog conversion device to weaken the high-frequency electromagnetic wave noise in the power signal. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a system connection schematic diagram of the utility model;

[0018] Figure 2 It is a power signal tracking effect diagram of the utility model;

[0019] In the diagram: 1. Integrated electronic current transformer; 2. Signal differential adder circuit; 3. Zero-crossing comparator; 4. Quantizer; 5. Signal feedback circuit; 6. Signal processing module. Detailed Implementation

[0020] The embodiments will be further described below with reference to the accompanying drawings.

[0021] like Figure 1 As shown in the preferred embodiment 1, a digital-to-analog conversion system for tracking power signals includes an integrated electronic instrument transformer 1. The integrated electronic instrument transformer 1 forms an inductive connection with the transmission line cable. The output terminal of the integrated electronic instrument transformer 1 is electrically connected to one input terminal of a signal differential adder circuit 2. The output terminal of the signal differential adder circuit 2 is electrically connected to the input terminal of a quantizer 4. The output terminal of the quantizer 4 is electrically connected to the input terminal of a signal processing module 6. A signal feedback circuit 5 is connected in parallel to the output terminal of the quantizer 4. The output terminal of the signal feedback circuit 5 is electrically connected to the other input terminal of the signal differential adder circuit 2.

[0022] The integrated electronic instrument transformer 1 includes multiple electronic instrument transformers connected in parallel with the input terminal of the signal differential adder circuit 2. These multiple electronic instrument transformers form an inductive connection with the same transmission line cable. Data acquisition is performed synchronously to ensure that each channel obtains accurate data.

[0023] The differential signal adder circuit 2 acquires two sets of signals respectively. One set of signals comes from the integrated electronic current transformer 1, and the other set of signals comes from the signal feedback circuit 5. The differential input stage calculates the difference between the two signals and outputs them to the quantizer 4.

[0024] The signal feedback circuit 5 includes a one-bit DAC and an integrator electrically connected. The input of the one-bit DAC is connected in parallel with the output of the quantizer 4, and the output of the one-bit DAC is connected to the input of the integrator. The output of the integrator is connected to the input of the signal differential adder circuit 2. The one-bit DAC can sense and track the output of one bit of digital stream and feed it back to the signal differential adder circuit 2 via the integrator.

[0025] The quantizer 4 is a one-bit quantizer.

[0026] The quantizer 4 includes a zero-crossing comparator 3 and a D flip-flop that are electrically connected. The output of the signal differential adder circuit 2 is electrically connected to the zero-crossing comparator 3. The output of the zero-crossing comparator 3 is electrically connected to the input of the D flip-flop. The output of the D flip-flop is electrically connected to the signal processing module 6.

[0027] The zero-crossing comparator 3 receives the differential signal and compares it with the ground.

[0028] The signal processing module 6 comprises an FPGA chip integrated with an ARM processor.

[0029] The FPGA chip is integrated with an integrated signal circuit, an averaging circuit and a transceiver module.

[0030] As shown in Fig. Figure 2 When the tracking signal is smaller than the analog signal sensed by the transformer, the one-bit quantizer outputs a high level, and the output signal continuously increases after passing through the integrator in the feedback loop to track the increasing analog signal.

[0031] The working principle of the utility model is as follows:

[0032] The utility model covers integrated electronic transformer 1, signal differential addition circuit 2, zero-crossing comparator 3, one-bit quantizer 4, signal feedback loop 5, signal processing module 6. Integrated electronic transformer 1 and signal differential addition circuit 2 are electrically connected, and one-bit quantizer 4 and signal processing module 6 are electrically connected for electrical isolation.

[0033] High-precision electronic transformer 1 is usually composed of multiple electronic transformers to collect data on the power transmission line at the same time, and then provide the data to the signal differential addition circuit 2 to ensure the accuracy and reliability of the data. The signal differential addition circuit 2 is composed of two groups of signals. One group of signals is directly integrated into the electronic transformer 1 for processing, and the other group of signals is input through the signal feedback loop 5, and the two signals are subtracted and transmitted to the zero-crossing comparator 3. The signal passes through a one-bit quantizer 4 and is transmitted to a signal processing module 6 for further processing and transmission of data. The ARM mainly undertakes the calculation task. The combination of FPGA and ARM can fully utilize their advantages, and N parallel circuits can be built inside to process N parallel high-speed signals. FPGA not only has high flexibility and programmability, but also can adjust the internal circuit according to the needs, and design different circuits for different environments to enhance the anti-interference ability.

Claims

1. A digital-to-analog conversion system for tracking power signals, characterized in that, The system includes an integrated electronic current transformer (1), which forms an inductive connection with the power transmission line cable. The output of the integrated electronic current transformer (1) is electrically connected to one input of a signal differential adder circuit (2). The output of the signal differential adder circuit (2) is electrically connected to the input of a quantizer (4). The output of the quantizer (4) is electrically connected to the input of a signal processing module (6). The output of the quantizer (4) is connected in parallel with a signal feedback circuit (5). The output of the signal feedback circuit (5) is electrically connected to the other input of the signal differential adder circuit (2).

2. The digital-to-analog conversion system for tracking power signals according to claim 1, characterized in that, The integrated electronic instrument transformer (1) includes multiple electronic instrument transformers connected in parallel with the input terminal of the signal differential adder circuit (2), and the multiple electronic instrument transformers form an inductive connection with the same power transmission line cable.

3. The digital-to-analog conversion system for tracking power signals according to claim 2, characterized in that, The signal differential adder circuit (2) acquires two sets of signals respectively. One set of signals comes from the integrated electronic transformer (1), and the other set of signals comes from the signal feedback circuit (5). The differential input circuit calculates the difference between the two signals and outputs them to the quantizer (4).

4. The digital-to-analog conversion system for tracking power signals according to claim 3, characterized in that, The signal feedback circuit (5) includes a one-bit DAC and an integrator that are electrically connected. The input terminal of the one-bit DAC is connected in parallel with the output terminal of the quantizer (4). The output terminal of the one-bit DAC is connected in parallel with the input terminal of the integrator. The output terminal of the integrator is connected in parallel with the input terminal of the signal differential adder circuit (2).

5. A digital-to-analog conversion system for tracking power signals according to claim 4, characterized in that, The quantizer (4) is a one-bit quantizer.

6. The digital-to-analog conversion system for tracking power signals according to claim 5, characterized in that, The quantizer (4) includes a zero-crossing comparator (3) and a D flip-flop that are electrically connected. The output of the signal differential adder circuit (2) is electrically connected to the zero-crossing comparator (3). The output of the zero-crossing comparator (3) is electrically connected to the input of the D flip-flop. The output of the D flip-flop is electrically connected to the signal processing module (6).

7. A digital-to-analog conversion system for tracking power signals according to claim 6, characterized in that, The signal processing module (6) includes an FPGA chip with an integrated ARM processor.

8. A digital-to-analog conversion system for tracking power signals according to claim 7, characterized in that, The FPGA chip integrates an integrated signal circuit, an averaging circuit, and a transceiver module. The input of the integrated signal circuit is electrically connected to the output of the quantizer (4). The output of the integrated signal circuit is electrically connected to the input of the averaging circuit. The output of the averaging circuit is electrically connected to the input of the ARM processor. The output of the ARM processor is connected to various external PCs through the transceiver module to form signal transmission.

Images