CN201541244U - A low-frequency high-power signal source - Google Patents

Abstract

A low-frequency high-power signal source, including a communication interface module 2, one end of the communication interface module 2 is connected to the computer 14, the other end is connected to the MCU5, the DDS module 6 is connected to the signal conditioning module 7, and the signal conditioning module 7 is connected to the signal isolation module 8 Connected, signal isolation module 8 is connected with power amplification module 9, temperature measurement module 10 is connected with power amplification module 9, MCU5, current measurement module 11 is connected with sampling resistor 13, MCU5, voltage measurement module 12 is connected with power amplification module 9, MCU5 , the load resistor 15 is connected to the power amplifier module 9; through the input keyboard module 4 or computer 14 input parameters to the MCU5, the MCU5 sends the corresponding command to the DDS module 6, and the output signal of the DDS module 6 can output sine and square waves after a series of processing and triangular wave, and provide a computer interface for easy computer control.

Description

A low-frequency high-power signal source

technical field

The utility model relates to a signal source, in particular to a low-frequency high-power signal source.

Background technique

When an existing programmable power signal source outputs a signal with a lower frequency (for example, ≤1 Hz), the signal waveform is seriously distorted. The frequency resolution and phase resolution of the signal source are not high. When the signal output by the signal source is required to have a large voltage (for example, 200V) and a high current (for example, 5A), the existing programmable power signal source cannot meet the requirements. Moreover, the interface between the programmable power signal source and the computer is relatively complicated, which is not convenient for system development.

Contents of the invention

In order to overcome the deficiencies of the above-mentioned prior art, the purpose of this utility model is to provide a low-frequency high-power signal source, which can output three waveforms of sine, square and triangle waves, and provide a computer interface to facilitate computer control.

In order to achieve the above object, the technical solution of the utility model is realized in that a kind of low-frequency high-power signal source comprises a power supply system module 1, and the power supply output end of the power supply system module 1 is connected with the power supply input end of the MCU5 and the DDS module 6 respectively. The power input end, the power input end of the signal conditioning module 7, the power input end of the signal isolation module 8, the power input end of the power amplifier module 9 are connected, one end of the communication interface module 2 is connected with the computer 14, and the other interface end is connected with the UART of the MCU5 The serial port is connected, the signal input terminal of the liquid crystal display module 3 is connected with the signal output general port of MCU5, the signal output terminal of input keyboard module 4 is connected with the signal input general port assigned by MCU5, the signal input terminal of DDS module 6 is connected with the SPI port of MCU5 Connected, the signal output end of the DDS module 6 is connected with the signal input end of the signal conditioning module 7, the signal output end of the signal conditioning module 7 is connected with the signal input end of the signal isolation module 8, the signal output end of the signal isolation module 8 is connected with the power amplifier The signal input end of module 9 is connected, and the signal input end of temperature measurement module 10 is connected with the temperature sensor signal output end of power amplifier module 9, and the signal output end of temperature measurement module 10 is connected with the signal input common port that MCU5 distributes, and current measurement module The signal input end of 11 is connected with sampling resistor 13 two ends, the signal output end of current measurement module 11 is connected with the signal input general port that MCU5 distributes, the signal input end of voltage measurement module 12 is connected with the signal output end of power amplification module 9, The signal output terminal of the voltage measurement module 12 is connected to the signal input common port assigned by the MCU5, and the load resistor 15 is connected to the signal output terminal of the power amplification module 9 .

The utility model finally outputs the signal frequency from the power amplification module 9 as DC to 100 Hz, the output signal frequency resolution is 0.0002 Hz, the phase resolution is 0.002 rad, the signal harmonic distortion is ≤0.1%, the output signal voltage range is ±300 V, and the output current ≤6A, output power ≤900W, can output three waveforms of sine wave, square wave and triangular wave, and is connected with the computer through the communication interface module 2, which is convenient for computer control.

Description of drawings

Accompanying drawing is the structural principle diagram of the utility model.

Detailed ways

Below in conjunction with accompanying drawing, structural principle and working principle of the present utility model are described in detail.

With reference to accompanying drawing, a kind of low-frequency high-power signal source comprises power system module 1, and the power output end of power system module 1 is respectively connected with the power input end of MCU5, the power input end of DDS module 6, the power input end of signal conditioning module 7 , the power input of the signal isolation module 8 and the power input of the power amplification module 9 are connected, one end of the communication interface module 2 is connected with the computer, the other interface is connected with the UART serial port of the MCU5, and the signal input of the liquid crystal display module 3 is connected with the MCU5 The 12 signal output ports assigned are connected, the signal output port of input keyboard module 4 is connected with 7 signal input ports assigned by MCU5, the input port of DDS module 6 is connected with the SPI port of MCU5, and the signal output port of DDS module 6 is connected with the SPI port of MCU5. The signal input end of the signal conditioning module 7 is connected, the signal output end of the signal conditioning module 7 is connected with the signal input end of the signal isolation module 8, the signal output end of the signal isolation module 8 is connected with the signal input end of the power amplification module 9, and the temperature measurement The signal input end of module 10 is connected with the signal output end of the temperature sensor of power amplification module 9, and the signal output end of temperature measurement module 10 is connected with the signal input general port that MCU5 distributes, and the signal input end of current measurement module 11 is connected with sampling resistor 13 The two ends are connected, the signal output end of the current measurement module 11 is connected with a signal input general port allocated by MCU5, the signal input end of the voltage measurement module 12 is connected with the signal output end of the power amplification module 9, and the signal output of the voltage measurement module 12 The end is connected with a signal input port assigned by MCU5, and the load resistor 15 is connected with the signal output end of the power amplification module 9.

The working principle of the present utility model is: the waveform, frequency, phase and output power parameters of the signal to be generated are input to the MCU5 through the input keyboard module 4 or the computer 14, and the MCU5 converts the waveform, frequency and phase parameters into an instruction for DDS module 6 identification, and sent to the DDS module 6 in turn, the signal conditioning module 7 filters the input signal, program-controlled gain amplification, limiting, etc., the signal isolation module 8 electrically isolates the low-voltage signal from the high-voltage signal, and the power amplification module 9 utilizes three pairs of low-voltage and high-current The series connection of the integrated power amplifier realizes the output of high voltage and high current. The temperature measurement module 10 measures the temperature signal of the power amplifier tube, reads the temperature data every 1SMCU5 and performs related processing. The current measurement module 11 measures the current output by the signal, and MCU5 reads the current data every 1S and performs related processing. The voltage measurement module 12 measures the voltage of the signal output, every 1S MCU5 reads the voltage data and performs related processing, and compares it with the set voltage data to control the programmable gain in the signal conditioning module 7. The liquid crystal display module 3 displays the waveform, frequency, phase, temperature, voltage, current, etc. of the output signal, and the data is refreshed every 1S. The communication interface module 2 realizes the communication between the computer and the MCU5. On the one hand, the control command of the computer is sent to the MCU5, and on the other hand, the data obtained by the MCU5 is transmitted to the computer in real time to realize data communication.

Claims (1)

1. low-frequency high-power signal source, comprise power system modules (1), it is characterized in that, the power output end of power system modules (1) respectively with the power input of MCU (5), the power input of DDS module (6), the power input of signal condition module (7), the power input of Signal Spacing module (8), the power input of power amplifier module (9) links to each other, communication interface modules (2) one ends link to each other with computer (14), another interface end links to each other with the UART serial ports of MCU (5), the signal input part of LCD MODULE (3) links to each other with the signal output universal port of MCU (5), the signal output part of input keyboard module (4) links to each other with the signal input universal port that MCU (5) distributes, the signal input part of DDS module (6) links to each other with the SPI mouth of MCU (5), the signal output part of DDS module (6) links to each other with the signal input part of signal condition module (7), the signal output part of signal condition module (7) links to each other with the signal input part of Signal Spacing module (8), the signal output part of Signal Spacing module (8) links to each other with the signal input part of power amplifier module (9), the input of temperature-measuring module (10) links to each other with the signal output part of the temperature sensor of power amplifier module (9), the signal output part of temperature-measuring module (10) links to each other with the signal input universal port that MCU (5) distributes, the signal input part of current measurement module (11) links to each other with sample resistance (13) two ends, the signal output part of current measurement module (11) links to each other with the signal input universal port that MCU (5) distributes, the signal input part of voltage measurement module (12) links to each other with the signal output part of power amplifier module (9), the signal output part of voltage measurement module (12) links to each other with the signal input universal port that MCU (5) distributes, and load resistance (15) links to each other with the signal output part of power amplifier module (9).