Program-controlled direct-current power supply device

Abstract

The utility model discloses a program-controlled DC power supply device comprising an ARM controller, an FPGA, a DA chip, an AD chip, a current signal acquisition circuit, a voltage signal acquisition circuit and a 0-300V DC power supply module. The voltage signal acquisition circuit is used for converting a high-voltage output signal of the direct-current power supply module into a low-voltage signal which can be acquired by an AD chip; the current signal acquisition circuit is used for converting an output current signal of the direct-current power supply module into a voltage signal which can be acquired by an AD chip; wherein the ARM controller compares actual voltage data acquired by the AD chip with target voltage data, and dynamically adjusts the output of the DA chip through the FPGA to form closed-loop control, so that the output voltage is stabilized at a set value. According to the utility model, stepless regulation and control of the output voltage of 0-300V can be realized.

Description

A programmable DC power supply device Technical Field

[0001] This utility model relates to the technical field of power supplies, specifically to a programmable DC power supply device. Background Technology

[0002] In recent years, with the construction and development of smart grids, the demand for DC power supplies has been increasing, and the requirements for intelligence have become more stringent. These supplies not only need stable output voltage but also adjustable and monitorable voltage capabilities to provide stable DC power to various sensors, relays, and actuators. As a crucial power supply device, the stability and reliability of DC power supplies directly affect the safe operation of the entire power grid.

[0003] Currently, most relay protection testers on the market are equipped with fixed DC power supplies of 24V, 48V, 110V, or 220V, which cannot be arbitrarily adjusted via a host computer. Furthermore, the output voltage is not monitored, making it impossible to guarantee output stability. Such power supplies can only meet the power requirements of some equipment. Therefore, a programmable DC power supply device is needed that can communicate with a host computer to adjust the voltage and monitor the output voltage to precisely regulate it from 0 to 300VDC to ensure power stability. Summary of the Invention

[0004] The main purpose of this utility model is to overcome the shortcomings and deficiencies of the existing technology and provide a programmable DC power supply device that can achieve stepless regulation of the output voltage from 0 to 300V.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model provides a programmable DC power supply device, including an ARM controller, an FPGA, a DA chip, an AD chip, a current signal acquisition circuit, a voltage signal acquisition circuit, and a 0-300V DC power supply module.

[0007] The ARM controller is used to receive the set target voltage data;

[0008] The FPGA is communicatively connected to the ARM controller and is used to receive target voltage data and control the DA chip to output corresponding analog control signals.

[0009] The DA chip is used to convert the digital controller signals output by the FPGA into analog voltage signals;

[0010] The AD chip is used to collect the actual output voltage and current data of the DC power supply module;

[0011] The 0-300V DC power supply module is used to adjust the output voltage according to the analog voltage signal output by the DA chip.

[0012] The voltage signal acquisition circuit is used to convert the high-voltage output signal of the DC power supply module into a low-voltage signal that can be acquired by the AD chip.

[0013] The current signal acquisition circuit is used to convert the output current signal of the DC power supply module into a voltage signal that can be acquired by the AD chip.

[0014] The ARM controller compares the actual voltage data collected by the AD chip with the target voltage data, and dynamically adjusts the output of the DA chip through the FPGA to form a closed-loop control, so that the output voltage is stabilized at the set value.

[0015] As a preferred technical solution, the voltage signal acquisition circuit includes an operational amplifier, a voltage divider resistor network, a first power supply filter circuit, and a feedback network. The first power supply filter circuit is connected to the second output terminal of the operational amplifier. The voltage divider resistor network includes multiple high-precision, low-temperature-drift resistors connected in series. One end of the feedback network is connected to the voltage divider resistor network and then connected to the positive input terminal of the operational amplifier. One end of the feedback network is connected to the third output terminal of the operational amplifier and then connected to AGND. The first output terminal of the operational amplifier outputs a voltage acquisition signal.

[0016] As a preferred technical solution, the operational amplifier is selected as OPA2277U.

[0017] As a preferred technical solution, the first power supply filter circuit includes a resistor R374 and a capacitor C130, and the resistor R374 and the capacitor C130 are connected together and connected to the second output terminal of the operational amplifier.

[0018] As a preferred technical solution, the feedback network includes a resistor R5 and a capacitor C5, which are connected in parallel. One end of the resistor R5 is connected to the positive input terminal of the operational amplifier, and the other end is connected to the third output terminal of the operational amplifier and then connected to AGND.

[0019] As a preferred technical solution, the current signal acquisition circuit includes an instrumentation amplifier, an input signal filtering circuit, an output signal filtering circuit, a second power supply filtering circuit, and a gain selection circuit. The second power supply filtering circuit is connected to pins 3 and 8 of the instrumentation amplifier input; the gain selection circuit is connected to pins 4 and 5 of the instrumentation amplifier input; the input signal filtering circuit is connected to pins 1 and 10 of the instrumentation amplifier input; the output signal filtering circuit is connected to pin 7 of the instrumentation amplifier output; and the current acquisition signal is output from pin 7 of the instrumentation amplifier output.

[0020] As a preferred technical solution, the input signal filtering circuit includes resistors R32 and R33, capacitors C40, C44, and C50. One end of resistor R32 is connected to the positive differential input, and the other end is connected to capacitor C40 and then to pin 10 of the instrumentation amplifier. One end of resistor R33 is connected to the negative differential input, and the other end is connected to capacitor C50 and then to pin 1 of the instrumentation amplifier, used to filter out common-mode interference signals. One end of capacitor C44 is connected to resistor R32, and the other end is connected to resistor R33, used to filter out differential-mode interference signals.

[0021] As a preferred technical solution, the output signal filtering circuit includes a resistor R31 and a capacitor C43. One end of the resistor R31 is connected to pin 7 of the instrumentation amplifier output, and the other end is connected to the capacitor C43, which is used to filter out noise interference in the output signal.

[0022] As a preferred technical solution, the second power supply filter circuit includes resistor R368, resistor R369, capacitor C34, capacitor C35, capacitor C48, and capacitor C51. One end of resistor R368 is connected to a -15V power supply, and the other end is connected to capacitors C34 and C35 and then connected to pin 3 of the instrumentation amplifier input. One end of resistor R369 is connected to a +15V power supply, and the other end is connected to capacitors C48 and C51 and then connected to pin 8 of the instrumentation amplifier input.

[0023] As a preferred technical solution, the amplification factor selection circuit includes resistors R23 and R29. One end of resistor R23 is connected to a 5V power supply, and the other end is connected to pin 5 of the instrumentation amplifier input. One end of resistor R29 is connected to DGND, and the other end is connected to pin 4 of the instrumentation amplifier input.

[0024] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0025] This invention achieves precise output and stable control of a wide voltage range of 0 to 300VDC through a collaborative control architecture of ARM and FPGA combined with a closed-loop feedback regulation mechanism. The voltage signal set by the user is transmitted to the FPGA via the ARM. The FPGA controls the output regulation signal of the DA chip to drive the DC power supply module. At the same time, the actual voltage / current data fed back by the AD chip is collected in real time and uploaded to the ARM for comparison and calculation. The DA output signal is dynamically adjusted to form a closed-loop control loop, which effectively solves the problem of insufficient regulation capability of traditional fixed voltage power supplies, significantly improves the stability of the output voltage, and has real-time monitoring and adaptive adjustment functions, which can meet the needs of diverse devices for high-precision, programmable DC power supplies. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 is a structural diagram of a programmable DC power supply device according to this utility model.

[0028] Figure 2 is a circuit diagram of the voltage signal acquisition circuit of this utility model;

[0029] Figure 3 is a circuit diagram of the current signal acquisition circuit of this utility model. Detailed Implementation

[0030] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0031] Please refer to Figure 1. This utility model provides a programmable DC power supply device, including an ARM controller, an FPGA, a DA chip, an AD chip, a current signal acquisition circuit, a voltage signal acquisition circuit, and a 0-300V DC power supply module. The device communicates the user-set voltage signal to the FPGA via the ARM controller. The FPGA controls the DA chip to output a voltage signal to the DC power supply module to control the 0-300VDC output. The FPGA also uploads the actual output voltage and current signals acquired by the AD chip to the ARM controller. The ARM controller compares the acquired voltage with the set voltage, calculates the adjustment, and then sends the calculated adjustment data to the FPGA to adjust the DA chip output so that the actual output voltage of the DC power supply module matches the set voltage, ensuring voltage stability. The ARM controller calculates the power based on the acquired actual output current and compares it with the set current limit value to determine if there is an overcurrent.

[0032] It is understood that the programmable DC power supply device of this utility model is based on ARM and FPGA, and combined with DA chip and AD chip to control the voltage of 0-300VDC DC power supply module and collect the actual output voltage and current for adjustment, thereby ensuring the stability and reliability of the output voltage.

[0033] Furthermore, the ARM controller receives the set target voltage data, sends the target voltage data to the FPGA, and performs calculations on the actual output voltage and current data returned by the FPGA. It should be noted that the FPGA calculates the returned voltage and current data using its own functionality, without involving any new software methods.

[0034] Furthermore, the FPGA is communicatively connected to the ARM controller to receive target voltage data and control the DA chip to output corresponding analog control signals; that is, on the one hand, it acquires the voltage set data of the ARM controller and controls the DA chip to adjust the output of the 0-300V DC power supply module; on the other hand, it reads the actual output voltage and current data collected by the AD chip, records the time, and uploads it to the ARM controller.

[0035] Furthermore, the DA chip is used to convert the digital controller signal output by the FPGA into an analog voltage signal; the AD chip is used to acquire the actual output voltage and current data of the DC power supply module.

[0036] Furthermore, the 0-300V DC power supply module is used to adjust the output voltage according to the analog voltage signal output by the DA chip.

[0037] Furthermore, the voltage signal acquisition circuit includes an operational amplifier, a voltage divider resistor network, a first power supply filter circuit, and a feedback network. The power supply filter circuit is connected to the second output terminal of the operational amplifier. The voltage divider resistor network includes multiple high-precision, low-temperature-drift resistors connected in series. One end of the feedback network is connected to the voltage divider resistor network and then connected to the positive input terminal of the operational amplifier. One end of the feedback network is connected to the third output terminal of the operational amplifier and then connected to AGND. The first output terminal of the operational amplifier outputs a voltage acquisition signal.

[0038] Furthermore, as shown in Figure 2, in a specific embodiment, the voltage signal acquisition circuit includes an operational amplifier OPA2277U. The OPA2277U is a high-precision, low-noise operational amplifier whose core function is to amplify signals with ultra-low offset and high rejection ratio while maintaining high linearity and low distortion. The first power supply filter circuit includes a resistor R374 and a capacitor C130. One end of resistor R374 and capacitor C130 is connected to the second output pin 8 of the OPA2277U, and the other end of resistor R374 is connected to a 15V power supply. The other end of capacitor C130 is connected to AGND. The voltage divider resistor network includes four resistors connected in series: resistors R383, R2, R384, and R4. Resistor R383 is connected to an external 300V voltage, and resistor R4 is connected to the positive input pin 5 of the OPA2277U. For example, resistors R383, R2, R384, and R4 have the same resistance value of 300K to achieve voltage reduction. The feedback network includes a resistor R5 and a capacitor C5. Resistor R5 and capacitor C5 are connected in parallel, with one end connected to pin 5 of the OPA2277U's positive input terminal and the other end connected to pin 3 of the OPA2277U's third output terminal, both then connected to AGND. For example, resistor R5 is 39KΩ and capacitor C5 is 0.1μF. Pin 6 of the OPA2277U's inverting input terminal is connected to pin 7 of its first output terminal, which outputs a voltage acquisition signal after passing through resistor R382.

[0039] Furthermore, the current signal acquisition circuit includes an instrumentation amplifier, an input signal filtering circuit, an output signal filtering circuit, a second power supply filtering circuit, and a gain selection circuit. The second power supply filtering circuit is connected to pins 3 and 8 of the instrumentation amplifier input; the gain selection circuit is connected to pins 4 and 5 of the instrumentation amplifier input; the input signal filtering circuit is connected to pins 1 and 10 of the instrumentation amplifier input; the output signal filtering circuit is connected to pin 7 of the instrumentation amplifier output; and the current acquisition signal is output from pin 7 of the instrumentation amplifier output.

[0040] Furthermore, as shown in Figure 3, in one specific embodiment, the current signal acquisition circuit includes an instrumentation amplifier AD8253. The AD8253 is a digitally programmable gain instrumentation amplifier with GΩ input impedance, low output noise, and low distortion characteristics, suitable for interfacing with sensors and driving high sampling rate analog-to-digital converters (ADCs). The input signal filtering circuit includes resistors R32 and R33, capacitors C40, C44, and C50. One end of resistor R32 is connected to the positive differential input, and the other end is connected to capacitor C40 and then to pin 10 of the instrumentation amplifier. One end of resistor R33 is connected to the negative differential input, and the other end is connected to capacitor C50 and then to pin 1 of the instrumentation amplifier, used to filter out common-mode interference signals. One end of capacitor C44 is connected to resistor R32, and the other end is connected to resistor R33, used to filter out differential-mode interference signals. For example, resistors R32 and R33 are both 20KΩ, capacitors C40 and C50 are both 2.2uF, and capacitor C44 is 22uF, used to achieve the purpose of filtering out differential-mode interference and common-mode interference. The output signal filtering circuit includes a resistor R31 and a capacitor C43. One end of the resistor R31 is connected to pin 7 of the instrumentation amplifier output, and the other end is connected to the capacitor C43, used to filter out noise interference in the output signal. For example, the resistor R31 is 20KΩ and the capacitor C43 is 2.2uF, used to achieve the purpose of noise filtering. The second power supply filtering circuit includes a resistor R368, a resistor R369, a capacitor C34, a capacitor C35, a capacitor C48, and a capacitor C51. One end of the resistor R368 is connected to the capacitors C34 and C35 and then connected to pin 3 of the instrumentation amplifier input, and the other end is connected to a -15V power supply. One end of the resistor R368 is connected to the capacitors C48 and C51 and then connected to pin 8 of the instrumentation amplifier input, and the other end is connected to a 15V power supply. The amplification factor selection circuit includes resistors R23 and R29. One end of resistor R23 is connected to a 5V power supply, and the other end is connected to pin 5 of the instrumentation amplifier input. One end of resistor R29 is connected to DGND, and the other end is connected to pin 4 of the instrumentation amplifier input, so as to achieve an amplification factor of 100 times.

[0041] The working principle of this invention is as follows: This invention achieves precise voltage regulation and stable output through a closed-loop feedback control mechanism. The specific working principle is as follows:

[0042] Command issuance: After the user sets the target voltage, the ARM controller transmits the set value to the FPGA;

[0043] Signal conversion and control: The FPGA parses instructions and controls the DA chip to output the corresponding analog voltage signal, driving the DC power supply module to output 0-300VDC voltage;

[0044] Real-time monitoring: The AD chip acquires output voltage and current data in real time through a dedicated acquisition circuit (voltage divider resistors, differential amplifier circuit, etc.) and feeds it back to the FPGA;

[0045] Dynamic adjustment: The FPGA uploads the monitoring data to the ARM, the ARM compares the actual voltage with the set value, calculates the error compensation signal, and dynamically adjusts the DA output through the FPGA;

[0046] Closed-loop stability: By cyclically executing the above process, a closed-loop control circuit is formed to ensure that the output voltage is always consistent with the set value (fluctuation range less than ±0.5%), and to judge the overcurrent risk in real time to trigger the protection mechanism.

[0047] Key features: The hardware and software architecture that integrates ARM and FPGA, combined with high-precision AD / DA and dedicated acquisition circuitry, enables fast response, adaptive adjustment and high-stability output over a wide voltage range.

[0048] It should be noted that in this specification, relational terms such as resistor R23 and resistor R28 are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0049] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0050] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A programmable DC power supply device, characterized in that, The system includes an ARM controller, an FPGA, a DA chip, an AD chip, a current signal acquisition circuit, a voltage signal acquisition circuit, and a 0-300V DC power supply module. The ARM controller receives a set target voltage data. The FPGA, communicatively connected to the ARM controller, receives the target voltage data and controls the DA chip to output corresponding analog control signals. The DA chip converts the digital controller signals output by the FPGA into analog voltage signals. The AD chip acquires the actual output voltage and current data of the DC power supply module. The 0-300V DC power supply module adjusts its output voltage based on the analog voltage signals output by the DA chip. The voltage signal acquisition circuit converts the high-voltage output signal of the DC power supply module into a low-voltage signal that the AD chip can acquire. The current signal acquisition circuit converts the output current signal of the DC power supply module into a voltage signal that the AD chip can acquire. The ARM controller compares the actual voltage data acquired by the AD chip with the target voltage data and dynamically adjusts the output of the DA chip through the FPGA, forming a closed-loop control to stabilize the output voltage at the set value.

2. The programmable DC power supply device according to claim 1, characterized in that, The voltage signal acquisition circuit includes an operational amplifier, a voltage divider resistor network, a first power supply filter circuit, and a feedback network. The first power supply filter circuit is connected to the second output terminal of the operational amplifier. The voltage divider resistor network includes multiple high-precision, low-temperature-drift resistors connected in series. One end of the feedback network is connected to the voltage divider resistor network and then connected to the positive input terminal of the operational amplifier. One end of the feedback network is connected to the third output terminal of the operational amplifier and then connected to AGND. The first output terminal of the operational amplifier outputs a voltage acquisition signal.

3. The programmable DC power supply device according to claim 2, characterized in that, The operational amplifier used is the OPA2277U.

4. The programmable DC power supply device according to claim 2, characterized in that, The first power supply filter circuit includes a resistor R374 and a capacitor C130. The resistor R374 and the capacitor C130 are connected together and then connected to the second output terminal of the operational amplifier.

5. A programmable DC power supply device according to claim 2, characterized in that, The feedback network includes a resistor R5 and a capacitor C5, which are connected in parallel. One end of the resistor R5 is connected to the positive input terminal of the operational amplifier, and the other end is connected to the third output terminal of the operational amplifier and then connected to AGND.

6. A programmable DC power supply device according to claim 1, characterized in that, The current signal acquisition circuit includes an instrumentation amplifier, an input signal filtering circuit, an output signal filtering circuit, a second power supply filtering circuit, and a gain selection circuit. The second power supply filtering circuit is connected to pins 3 and 8 of the instrumentation amplifier input; the gain selection circuit is connected to pins 4 and 5 of the instrumentation amplifier input; and the input signal filtering circuit is connected to pins 1 and 10 of the instrumentation amplifier input. The output signal filtering circuit is connected to pin 7 of the instrumentation amplifier output. The instrumentation amplifier outputs a current acquisition signal at pin 7.

7. A programmable DC power supply device according to claim 6, characterized in that, The input signal filtering circuit includes resistors R32 and R33, capacitors C40, C44, and C50. One end of resistor R32 is connected to the positive differential input, and the other end is connected to capacitor C40 and then to pin 10 of the instrumentation amplifier. One end of resistor R33 is connected to the negative differential input, and the other end is connected to capacitor C50 and then to pin 1 of the instrumentation amplifier. This circuit is used to filter out common-mode interference signals. One end of capacitor C44 is connected to resistor R32, and the other end is connected to resistor R33. This circuit is used to filter out differential-mode interference signals.

8. A programmable DC power supply device according to claim 6, characterized in that, The output signal filtering circuit includes a resistor R31 and a capacitor C43. One end of the resistor R31 is connected to pin 7 of the instrumentation amplifier output, and the other end is connected to the capacitor C43, which is used to filter out noise interference in the output signal.

9. A programmable DC power supply device according to claim 6, characterized in that, The second power supply filter circuit includes resistors R368 and R369, capacitors C34, C35, C48, and C51. One end of resistor R368 is connected to a -15V power supply, and the other end is connected to capacitors C34 and C35 and then connected to pin 3 of the instrumentation amplifier input. One end of resistor R369 is connected to a +15V power supply, and the other end is connected to capacitors C48 and C51 and then connected to pin 8 of the instrumentation amplifier input.

10. A programmable DC power supply device according to claim 6, characterized in that, The amplification factor selection circuit includes resistors R23 and R29. One end of resistor R23 is connected to a 5V power supply, and the other end is connected to pin 5 of the instrumentation amplifier input. One end of resistor R29 is connected to DGND, and the other end is connected to pin 4 of the instrumentation amplifier input.

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