Large-current pulse current generating device based on FPGA

Abstract

The utility model discloses a large-current pulse current generating device based on an FPGA, and the device comprises a main controller, an optocoupler, an amplitude control circuit, a width control circuit, a constant current source circuit, a pulse measurement circuit, and a protection circuit. The control signal output end of the main controller is electrically connected with the input end of the amplitude control circuit and the input end of the width control circuit through the optocoupler, and the output end of the width control circuit is electrically connected with the first control end of the constant current source circuit. A plurality of output ends of the amplitude control circuit are electrically connected with the other plurality of control ends of the constant current source circuit respectively, and the amplitude of the current pulses is remarkably improved and the duration time is prolonged through a multi-path current pulse superposition method. The large-current pulse current generating device based on the FPGA provided by the utility model has the effects of accurately controlling the amplitude and width of the current pulse, remarkably improving the amplitude of the current pulse and prolonging the duration time.

Description

Technical Field

[0001] The utility model relates to the technical field of power systems, and in particular to a large current pulse current generating device based on FPGA. Background Art

[0002] Large current pulse current generators have a wide range of applications in many fields, such as fault detection and location in power systems, lightning tests, electrochemical machining, plasma research, etc. However, there are some technical defects in existing large current pulse current generators:

[0003] 1) The amplitude of the current pulse is relatively low.

[0004] 2) The problem of limited adjustable range of the pulse width.

[0005] 3) The problem of fixed load.

[0006] 4) The problem of relatively long rise and fall times of the generated current pulse.

[0007] 5) The stability and reliability of the current pulse are insufficient. Summary of the Utility Model

[0008] In view of the above problems, a large current pulse current generating device based on FPGA is provided, aiming to solve the problems existing in the prior art.

[0009] The specific technical solutions are as follows:

[0010] A large current pulse current generating device based on FPGA includes a main controller, an optocoupler, an amplitude control circuit, a width control circuit, a constant current source circuit, a pulse measurement circuit, and a protection circuit. The control signal output end of the main controller is electrically connected to the input ends of the amplitude control circuit and the width control circuit respectively through the optocoupler. The output end of the width control circuit is electrically connected to the first control end of the constant current source circuit. Multiple output ends of the amplitude control circuit are respectively electrically connected to other multiple control ends of the constant current source circuit. The multiple output ends of the constant current source circuit are superimposed and output to the load. The pulse measurement circuit is used to collect the superimposed end of the constant current source circuit and feed the collected pulse parameters back to the main controller. The protection circuit is used to collect the superimposed output end of the constant current source circuit and feed the collected information back to the main controller.

[0011] The above large current pulse current generating device based on FPGA further has the following characteristics. The width control circuit includes a width control module and a current switching switch. The input end of the width control module is electrically connected to one of the output ends of the optocoupler. The output end of the width control module is electrically connected to the first control end of the constant current source circuit through the current switching switch.

[0012] The above-mentioned large current pulse current generating device based on FPGA further has the following characteristics. The amplitude control circuit includes a first amplitude control module and a second amplitude control module. The first amplitude control module and the second amplitude control module are respectively electrically connected to two output terminals of the optocoupler. The output terminal of the first amplitude control module is respectively electrically connected to one of the constant current sources in the constant current source circuit. Multiple output terminals of the second amplitude control module are respectively electrically connected to the other multiple constant current sources in the constant current source circuit.

[0013] The above-mentioned large current pulse current generating device based on FPGA further has the following characteristics. The constant current source circuit includes a regulated power supply, a fractional amplitude constant current source, multiple integer amplitude constant current sources, and a compensation constant current source. The fractional amplitude constant current source, the multiple integer amplitude constant current sources, and the compensation constant current source are all powered by the regulated power supply. The fractional amplitude constant current source is electrically connected to the first amplitude control module. Multiple integer amplitude constant current sources are respectively electrically connected to multiple output terminals of the second amplitude control module. The output terminals of the fractional amplitude constant current source, the multiple integer amplitude constant current sources, and the compensation constant current source are superimposed and output to the load.

[0014] The above-mentioned large current pulse current generating device based on FPGA further has the following characteristics. The pulse measurement circuit includes an amplitude measurement module and a width measurement module. The input terminals of the amplitude measurement module and the width measurement module are both electrically connected to the superimposed output terminal of the constant current source circuit. The output terminals of the amplitude measurement module and the width measurement module are both electrically connected to the feedback terminal of the main controller.

[0015] In summary, the beneficial effects of this solution are:

[0016] In the large current pulse current generating device based on FPGA provided by the present invention, by means of the method of superimposing multiple current pulses, a significant increase in the amplitude of the current pulse and an extension of the duration are achieved. The large current pulse current generating device based on FPGA provided by the present invention has the effects of precise control of the amplitude and width of the current pulse, a significant increase in the amplitude of the current pulse, and an extension of the duration. Description of the Drawings

[0017] Figure 1 It is a schematic circuit diagram of the large current pulse current generating device based on FPGA of the present invention. Detailed Embodiments

[0018] The technical solution of the present utility model will be clearly and completely described below in conjunction with the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts belong to the scope of protection of the present utility model.

[0019] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments may be combined with each other.

[0020] The present utility model will be further described below in conjunction with specific embodiments, but it is not limited to the present utility model.

[0021] Figure 1 is a schematic circuit diagram of a high-current pulsed current generating device based on FPGA of the present utility model. As Figure 1 shown, the high-current pulsed current generating device based on FPGA provided in this embodiment includes a main controller, an optocoupler, an amplitude control circuit, a width control circuit, a constant current source circuit, a pulse measurement circuit, and a protection circuit. The control signal output terminal of the main controller is electrically connected to the input terminals of the amplitude control circuit and the width control circuit respectively through the optocoupler. The output terminal of the width control circuit is electrically connected to the first control terminal of the constant current source circuit. Multiple output terminals of the amplitude control circuit are respectively electrically connected to multiple other control terminals of the constant current source circuit. The multiple output terminals of the constant current source circuit are superimposed and output to the load. The pulse measurement circuit is used to collect the superimposed terminal of the constant current source circuit and feedback the collected pulse parameters to the main controller. The protection circuit is used to collect the superimposed output terminal of the constant current source circuit and feedback the collected information to the main controller.

[0022] It should be noted that the main controller uses a field programmable gate array (FPGA) as the main control chip.

[0023] In the above embodiment, the width control circuit includes a width control module and a current switching switch. The input terminal of the width control module is electrically connected to one of the output terminals of the optocoupler. The output terminal of the width control module is electrically connected to the first control terminal of the constant current source circuit through the current switching switch.

[0024] In the above embodiment, the amplitude control circuit includes a first amplitude control module and a second amplitude control module. The first amplitude control module and the second amplitude control module are respectively electrically connected to the two output terminals of the optocoupler. The output terminal of the first amplitude control module is electrically connected to one of the constant current sources in the constant current source circuit. Multiple output terminals of the second amplitude control module are respectively electrically connected to multiple other constant current sources in the constant current source circuit.

[0025] It should be noted that both the first amplitude control module and the second amplitude control module are prior arts. They are used to receive the control signals output by the main controller and transmit the control signals to the corresponding constant current sources in the constant current source circuit.

[0026] In the above embodiment, the constant current source circuit includes a regulated power supply, a fractional amplitude constant current source, a plurality of integer amplitude constant current sources, and a compensation constant current source. The fractional amplitude constant current source, the plurality of integer amplitude constant current sources, and the compensation constant current source are all powered by the regulated power supply. The fractional amplitude constant current source is electrically connected to the first amplitude control module, and the plurality of integer amplitude constant current sources are respectively electrically connected to the plurality of output terminals of the second amplitude control module. The output terminals of the fractional amplitude constant current source, the output terminals of the plurality of integer amplitude constant current sources, and the output terminal of the compensation constant current source are superimposed and output to the load.

[0027] In the above embodiment, the pulse measurement circuit includes an amplitude measurement module and a width measurement module. The input terminals of the amplitude measurement module and the width measurement module are both electrically connected to the superimposed output terminal of the constant current source circuit, and the output terminals of the amplitude measurement module and the width measurement module are both electrically connected to the feedback terminal of the main controller.

[0028] It should be noted that the pulse measurement circuit uses a high-precision sampling resistor and a first-order Σ-Δ analog-to-digital converter for sampling and conversion.

[0029] It should also be noted that the protection circuit includes an overload protection module, an under-voltage protection module, and a high-voltage fuse module to ensure the overall safety.

[0030] The working principle is as follows: A field-programmable gate array (FPGA) is used as the main control chip. Through analog circuit operations such as filtering and amplification of control signals and the method of multiplexed current pulse superposition, the characteristics of large current pulse amplitude and long duration are achieved. At the same time, through the carefully designed control circuit operations, the rise and fall times of the generated current pulses are greatly reduced, and a large adjustable range of current amplitude (10.00A, 99.99ms) is achieved. In the pulse measurement circuit, a high-precision sampling resistor and a first-order Σ-Δ analog-to-digital converter (ADC) are used for sampling and conversion, achieving an improvement in the measurement accuracy of amplitude and width and controlling it within ±2%.

[0031] The above are only the preferred embodiments of the present utility model, and do not limit the implementation manners and protection scope of the present utility model. For those skilled in the art, it should be able to realize that all the equivalent replacements and obvious changes made by using the content of the specification of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A high-current pulse current generating device based on FPGA, comprising a main controller, an optical coupler, an amplitude control circuit, a width control circuit, a constant current source circuit, a pulse measurement circuit and a protection circuit, wherein the control signal output end of the main controller is electrically connected to the input end of the amplitude control circuit and the input end of the width control circuit respectively through the optical coupler, the output end of the width control circuit is electrically connected to the first control end of the constant current source circuit, the multiple output ends of the amplitude control circuit are electrically connected to the other multiple control ends of the constant current source circuit respectively, the multiple output ends of the constant current source circuit are superimposed and output to the load, the pulse measurement circuit is used to collect the superimposed end of the constant current source circuit, and the collected pulse parameters are fed back to the main controller, and the protection circuit is used to collect the superimposed output end of the constant current source circuit, and the collected information is fed back to the main controller.

2. The high current pulse current generating device based on FPGA according to claim 1, characterized in that: The width control circuit includes a width control module and a current switching switch, the input end of the width control module is electrically connected to one of the output ends of the optocoupler, and the output end of the width control module is electrically connected to the first control end of the constant current source circuit through the current switching switch.

3. The high current pulse current generating device based on FPGA according to claim 2, characterized in that: The amplitude control circuit includes a first amplitude control module and a second amplitude control module, the first amplitude control module and the second amplitude control module are respectively electrically connected to the two output ends of the optocoupler, the output end of the first amplitude control module is respectively electrically connected to one of the constant current sources in the constant current source circuit, and the multiple output ends of the second amplitude control module are respectively electrically connected to the other multiple constant current sources in the constant current source circuit.

4. The high current pulse current generating device based on FPGA according to claim 3, characterized in that: The constant current source circuit includes a regulated power supply, a fractional amplitude constant current source, a plurality of integer amplitude constant current sources and a compensation constant current source. The fractional amplitude constant current source, the plurality of integer amplitude constant current sources and the compensation constant current source are all powered by the regulated power supply. The fractional amplitude constant current source is electrically connected to the first amplitude control module, and the plurality of integer amplitude constant current sources are respectively electrically connected to the plurality of output ends of the second amplitude control module. The output ends of the fractional amplitude constant current source, the output ends of the plurality of integer amplitude constant current sources and the output end of the compensation constant current source are superimposed and output to a load.

5. A high current pulse current generating device based on FPGA according to any one of claims 1 to 4, characterized in that: The pulse measurement circuit includes an amplitude measurement module and a width measurement module, the input ends of the amplitude measurement module and the width measurement module are electrically connected to the superposition output end of the constant current source circuit, and the output ends of the amplitude measurement module and the width measurement module are electrically connected to the feedback end of the main controller.

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