CN217469764U - Programmable digital excitation power supply - Google Patents

Abstract

The utility model relates to a digital excitation power able to programme, a serial communication port, including microcontroller circuit (1), DA converting circuit (2), power amplifier circuit (3), man-machine interaction circuit (4), interface module (5), can turn into amplitude, frequency accuracy with the direct current voltage signal of input, the distortion factor is less than 0.3% exchange excitation voltage. Wherein the interface component (5) introduces a power supply; the microcontroller circuit (1) is connected with the D/A conversion circuit (2) through a parallel bus, and binary data obtained by operation are transmitted to the D/A conversion circuit (2); the D/A conversion circuit (2) transmits the analog signal obtained after conversion to the power amplification circuit (3); the power amplification circuit (3) converts the analog signal into a power supply signal which has low output impedance, strong loading capacity and satisfactory amplitude, then transmits the power supply signal to the interface component (5) and provides an excitation power supply with low distortion degree to an external load.

Description

Programmable digital excitation power supply

Technical Field

The utility model relates to an electric field, concretely relates to according to load RVDT demand, can manually adjust the output, provide the little volume AC excitation power of low distortion degree for the load.

Background

The angle of attack sensor is an important sensor for civil aircraft and military aircraft, and can measure the flight attitude of the aircraft and provide feedback for pilots to control the aircraft. Most of the sensitive elements of the attack angle sensor are non-contact type RVDTs, the power supply signals of the RVDTs are alternating current excitation power supplies, and the distortion degree is required to be lower than 0.3%. When designing a non-mapping test device, a built-in excitation power supply is usually needed, and excitation signals with certain power, accurate frequency and distortion degree lower than 0.3% are provided for the RVDT.

The conventional method is to use an oscillation circuit and a power operational amplifier. However, the circuit of the implementation method has weak loading capacity, the power operational amplifier is easy to damage and is influenced by environmental factors, the flexibility is low, once the circuit design is completed, the amplitude and the frequency of an output signal of the power operational amplifier are difficult to change, and meanwhile, the distortion degree is difficult to adjust.

SUMMERY OF THE UTILITY MODEL

The utility model aims at: a programmable digital excitation power supply is designed, an oscillating circuit and a power amplifier are not needed, and the purposes of programmable output and controllable distortion degree are achieved.

A programmable digital excitation power supply comprises a microcontroller circuit 1, a D/A conversion circuit 2, a power amplification circuit 3, a man-machine interaction circuit 4 and an interface component 5, and can convert an input direct-current voltage signal into alternating-current excitation voltage with amplitude and frequency accuracy and distortion degree lower than 0.3%. The connection and assembly relationship of the components is shown in fig. 1. The interface component 5 introduces a direct current +/-15V power supply to supply power for the microcontroller circuit 1, the D/A conversion circuit 2 and the power amplification circuit 3; the microcontroller circuit 1 is connected with the D/A conversion circuit 2 through a parallel bus, and binary data obtained by operation are transmitted to the D/A conversion circuit 2; the D/A conversion circuit 2 transmits the analog signal obtained after conversion to the power amplification circuit 3; the power amplifying circuit 3 converts the analog signal into a power supply signal which has low output impedance, strong loading capacity and meets the requirements in amplitude, then transmits the power supply signal to the interface component 5, and provides an excitation power supply with low distortion degree to an external load.

The microcontroller circuit 1 comprises a power supply circuit, a microcontroller, a clock circuit, a reset circuit, an interface and a communication circuit. The power supply circuit converts an input +15V power supply into a 3.3V power supply, leads the power supply to a power supply pin of the microcontroller and provides power for the microcontroller; the clock circuit leads the clock signal to a clock input pin of the microcontroller to provide a stable clock reference for the microcontroller; the reset circuit leads a reset signal to a reset pin of the microcontroller and provides the microcontroller with the reset signal when the power-on and the circuit work are abnormal; the interface and the communication circuit comprise a parallel bus, a general I/O and a communication interface, and realize the functions of the microcontroller and an external circuit for completing parallel data communication, man-machine interaction signal transmission and program programming, and the principle of the interface and the communication circuit is shown in figure 2.

The utility model discloses code is write into to microcontroller circuit to digital excitation power able to programme, carries out the accurate timing through using the timer in the code, and in the signal cycle of each alternating current excitation power, 96 equidistant data points are no less than in the operation, come the reduction alternating current excitation power signal, guarantee that the distortion factor of exciting the power is less than 0.3%.

The utility model discloses digital excitation power able to programme can change power output signal amplitude and frequency through operation man-machine interaction circuit 4.

In a first aspect, the present application provides a programmable digital excitation power supply, where the programmable digital excitation power supply includes a microcontroller circuit 1, a D/a conversion circuit 2, a power amplification circuit 3, a human-computer interaction circuit 4, and an interface component 5, where:

the microcontroller circuit 1 is internally provided with a preset operation program, can periodically calculate and output binary data of a modulation wave, and can output at least 96 data points in one modulation wave period; the microcontroller circuit 1 and the D/A conversion circuit 2 complete data transmission through parallel bus communication so as to meet the requirement of high real-time performance. The D/A conversion circuit 2 converts the binary data output by the microcontroller circuit 1 into an analog signal corresponding to the binary data, the amplitude of the analog signal is controlled by the binary data, and the frequency of the analog signal is the frequency of the modulation wave; the power amplifying circuit 3 amplifies the analog signal output by the D/A conversion circuit 2, so that the amplitude value meets the use requirement, and the microcontroller circuit 1 is connected with the man-machine interaction circuit 4 in an interconnecting way, so that the type, the amplitude value and the frequency of the output signal of the power supply can be changed, and the distortion factor of the excitation power supply is not more than 0.3 percent. The input and output signals of the AC excitation power supply are transmitted with an external system through the interface component 5, and the AC excitation power supply is installed.

The utility model has the advantages that:

the utility model discloses but programming digital excitation power uses microcontroller as the core, can realize the change of output signal (modulation wave) type, amplitude and frequency through the procedure, and the flexibility is high, and the degree of distortion is easily controlled simultaneously. The load capacity of the programmable excitation power supply is greatly improved by adopting the power amplifying circuit. In addition, by ensuring the number of data points output by the microcontroller circuit 1 in each period, an analog filter is not required to be arranged at the later stage of the digital excitation power supply, and the system configuration is simplified.

Drawings

FIG. 1 is a schematic diagram of the present programmable digital excitation power supply architecture;

FIG. 2 is a schematic block diagram of a microcontroller circuit;

fig. 3 is a schematic block diagram of a power amplification circuit.

Detailed Description

The invention will be further explained with reference to the following figures and examples:

referring to fig. 1, the present invention relates to a programmable digital excitation power supply, which includes a microcontroller circuit 1, a D/a conversion circuit 2, a power amplification circuit 3, a man-machine interaction circuit 4, and an interface module 5, and can convert an input dc voltage signal into an ac excitation voltage with an amplitude, a frequency, and a distortion factor lower than 0.3%.

The interface component 5 introduces a direct current +/-15V power supply to supply power for the microcontroller circuit 1, the D/A conversion circuit 2 and the power amplification circuit 3; the microcontroller circuit 1 is connected with the D/A conversion circuit 2 through a parallel bus, and binary data obtained by operation are transmitted to the D/A conversion circuit 2; the D/A conversion circuit 2 transmits the analog signal obtained after conversion to the power amplification circuit 3; the power amplifying circuit 3 converts the analog signal into a power supply signal which has low output impedance, strong loading capacity and meets the requirements in amplitude, then transmits the power supply signal to the interface component 5, and provides an excitation power supply with low distortion degree to an external load.

Referring to fig. 2, the hardware portion of the microcontroller circuit 1 includes a minimum system for enabling the microcontroller to operate properly. The minimum system comprises a power supply circuit, a clock circuit, a reset circuit, an I/O circuit and a JTAG/J-LINK interface. The power supply circuit, the clock circuit, the reset circuit, the I/O circuit and the JTAG/J-LINK interface are all connected to the microcontroller and arranged around the microcontroller. The microcontroller of the microcontroller circuit 1 is internally preset with an arithmetic program, and can periodically calculate and output binary data of a desired waveform. In order to ensure that the distortion of the excitation power supply is lower than 0.3%, the preset operation program ensures that the microcontroller circuit 1 can complete the operation of at least 96 data points in each period of the output signal, and the data points can completely describe one signal period of the modulation wave. In order to reduce the system resources of the microcontroller circuit 1, the modulated waves are periodic and symmetrical signals, so that the operation of binary data can be completed in a table look-up manner.

The microcontroller circuit 1 and the D/A conversion circuit 2 are communicated through a parallel bus, the requirement of high real-time performance can be met, the D/A conversion circuit 2 converts binary data output by the microcontroller circuit 1 into analog signals corresponding to the binary data, the amplitude of the analog signals is controlled by the binary data, the frequency is controlled by the operation and sending period of the binary data, and the frequency is equal to the frequency of a modulation wave. In this link, the amplitude of the analog signal may be different from the amplitude of the modulated wave signal, and the amplitude adjustment may be completed by the power amplifying circuit 3 in the subsequent stage. Here, the D/a converter of the D/a conversion circuit 2 is preferably a chip powered by positive and negative power sources, so that the output analog signal is free from dc offset.

Referring to fig. 3, the power amplifier circuit 3 includes an operational amplifier and an amplifier circuit, and a negative feedback is provided between the operational amplifier and the amplifier circuit. The power amplifying circuit 3 amplifies the analog signal output by the D/A conversion circuit 2, so that the amplitude value meets the use requirement, and the excitation power supply has strong loading capacity. Here, the power amplification circuit 3 may constitute a push-pull circuit using a general integrated operational amplifier and transistor, and its structure is not limited to the push-pull circuit structure. The push-pull circuit formed by integrating the operational amplifier and the transistor greatly improves the loading capacity of the power supply under the condition of ensuring that the amplitude of the analog signal is adjusted to the expected amplitude.

The man-machine interaction circuit 4 is interconnected with the I/O circuit of the microcontroller circuit 1, and the type, amplitude and frequency of the power supply output signal can be changed by operating the man-machine interaction circuit 4. The main structure of the man-machine interaction circuit 4 is a touch switch, a pull-up and a pull-down.

To sum up, the utility model provides a for attacking sensor ground non-standard survey equipment usefulness small volume digital excitation power able to programme realizes the production of target waveform through microcontroller and DA conversion technique to utilize the amplitude of power amplifier circuit adjustment signal to improve the area load ability of power simultaneously. The configured man-machine interaction circuit 4 can complete the adjustment of the amplitude and the frequency of an expected power supply according to the requirements of different attack angle sensors, is convenient and flexible, and can supply power to a plurality of attack angle sensors.

The above description is only for the specific embodiments of the present invention, and the present invention is described in detail, and the detailed description is not the conventional technology. However, the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are also included in the scope of the present invention. The protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (6)

1. A programmable digital excitation power supply is characterized by comprising a microcontroller circuit (1), a D/A conversion circuit (2), a power amplification circuit (3), a man-machine interaction circuit (4) and an interface component (5), wherein the interface component (5) introduces a direct current +/-15V power supply to supply power for the microcontroller circuit (1), the D/A conversion circuit (2) and the power amplification circuit (3); the microcontroller circuit (1) is connected with the D/A conversion circuit (2) through a parallel bus, and binary data obtained by operation are transmitted to the D/A conversion circuit (2); the D/A conversion circuit (2) transmits the analog signal obtained by the conversion to the power amplification circuit (3).

2. The programmable digital excitation power supply according to claim 1, wherein the microcontroller circuit (1) comprises a power supply circuit, a microcontroller, a clock circuit, a reset circuit, an interface and a communication circuit, wherein the power supply circuit converts an input +15V power supply into a 3.3V power supply, leads to a microcontroller power supply pin and provides power for the microcontroller; the clock circuit leads the clock signal to a clock input pin of the microcontroller to provide a stable clock reference for the microcontroller; the reset circuit leads a reset signal to a reset pin of the microcontroller and provides the microcontroller with the reset signal when the power-on and the circuit work are abnormal; the interface and communication circuit comprise a parallel bus, a general purpose I/O and a communication interface.

3. The programmable digital excitation power supply according to claim 1, wherein the man-machine interaction circuit (4) is a pull-up switch matrix circuit, and high and low level signals are input to the microcontroller by pressing a switch.

4. The programmable digital excitation power supply of claim 1, wherein said excitation power supply is of a card-type structure, and the installation form thereof can be changed by changing different interface components.

5. The programmable digital excitation power supply according to claim 1, wherein the power amplifier circuit is composed of 2 links of an amplifier circuit and an operational amplifier, an analog signal is input to an input end of the operational amplifier, and the operational amplifier transmits the obtained output signal to the amplifier circuit.

6. The programmable digitally-excited power supply of claim 5, wherein the output of the amplifying circuit is a power signal, and the power signal is directed back to the inverting input of the operational amplifier to form a negative feedback circuit.

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