CN219676113U - Alternating current constant current source based on electronic load - Google Patents
Alternating current constant current source based on electronic load Download PDFInfo
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- CN219676113U CN219676113U CN202222615262.1U CN202222615262U CN219676113U CN 219676113 U CN219676113 U CN 219676113U CN 202222615262 U CN202222615262 U CN 202222615262U CN 219676113 U CN219676113 U CN 219676113U
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 38
- 230000009466 transformation Effects 0.000 claims abstract description 27
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 15
- 229910052710 silicon Inorganic materials 0.000 claims description 15
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Abstract
The utility model relates to an alternating current constant current source based on an electronic load, which comprises a power transformation circuit, a high-speed analog-to-digital conversion circuit and a controller, wherein the power transformation circuit adjusts current output through the electronic load arranged on the primary side of a transformer, the output current is collected through the high-speed analog-to-digital conversion circuit and is sent to the controller to form closed loop feedback control, and a main control end of the controller is electrically connected with the electronic load. The utility model has the advantages of quick current output response, high current precision, stable and reliable circuit structure, convenient adjustment and applicability to various different working scenes.
Description
Technical Field
The utility model relates to the technical field of test equipment, in particular to test equipment in the field of electronic appliances, and in particular relates to an alternating current constant current source for supplying power to a test load.
Background
In order to measure the performance of electronic components, further realize product quality control and provide test basis for product research and development, in the existing scheme for testing electronic components in the market, test experiments under multiple current states are needed, especially for a contactor test system, performance characteristics of the contactor test system under different currents need to be verified, but the existing AC constant current source in the market is mostly realized by adopting an inversion principle, the waveform ripple is large, the precision can only reach about 1%, and the preset current value cannot be reached within 60 milliseconds before the waveform of the main current AC constant current source. This results in a slower output response at current change and low current accuracy, resulting in a tendency for the final test result to deviate.
Disclosure of Invention
The utility model aims to provide an alternating current constant current source based on an electronic load, which has the advantages of quick current output response, high current precision, stable and reliable circuit structure and convenience in adjustment, and can be applied to various different working scenes.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the utility model provides an alternating current constant current source based on an electronic load, which comprises a power transformation circuit, a high-speed analog-to-digital conversion circuit and a controller, wherein,
the power transformation circuit comprises a main transformer, an electronic load, a silicon controlled rectifier and a current transformer, wherein the electronic load and the silicon controlled rectifier are connected in series on the primary side of the main transformer, the current transformer is connected in series on the secondary side of the main transformer, the electronic load and the silicon controlled rectifier are respectively connected with the control end of the controller, the acquisition input end of the high-speed digital-to-analog conversion circuit is connected with the current transformer, the output end of the high-speed digital-to-analog conversion circuit is connected with the data acquisition end of the controller, and the secondary loop of the main transformer is an output loop;
the primary side of the main transformer is connected in series with a first auxiliary transformer for increasing the voltage of a primary loop of the main transformer, the secondary side of the first auxiliary transformer is connected in series with the primary loop of the main transformer, the primary side of the first auxiliary transformer is connected with the mains supply, the secondary side of the main transformer is connected in series with a second auxiliary transformer, the secondary side of the second auxiliary transformer is connected in series with a secondary loop of the main transformer, and the electronic load is connected in series in the primary side of the second auxiliary transformer.
For the above solutions, the applicant has further optimisation.
Optionally, a plurality of contactors for controlling loop switching are arranged in the primary loop and the secondary loop of each transformer in the power transformation circuit.
Further, the commercial power is sequentially fed into an electronic load and a controllable silicon after passing through a loop breaker and a controllable contactor, and then is connected into a primary side coil of the main transformer, and a trigger control end of the controllable contactor is connected with a control end of the controller.
Optionally, the high-speed analog-to-digital conversion circuit comprises a DAC conversion circuit and an ADC conversion circuit, wherein the input end of the ADC conversion circuit is connected with the current transformer, and the output end of the ADC conversion circuit is connected with the data acquisition end of the controller.
Optionally, the electronic load is an alternating current electronic load of 1800W, and the controller controls the electronic load to generate high-speed and high-precision current output.
Optionally, the transformation ratio of the main transformer is 400V/10V, the secondary loop of the main transformer is a system output loop, two current sensors of 500A/5000A are connected in the secondary loop of the main transformer, and the two current transformers are respectively subjected to analog-to-digital conversion by an analog-to-digital conversion circuit in the high-speed analog-to-digital conversion circuit and then sent to the controller.
Due to the application of the technical scheme, compared with the prior art, the utility model has the following advantages:
the utility model relates to an alternating current constant current source based on an electronic load, wherein a power transformation circuit adjusts current output through the electronic load arranged on the primary side of a transformer, the output current is collected through a high-speed analog-to-digital conversion circuit and is sent to a controller to form closed loop feedback control, a main control end of the controller is electrically connected with the electronic load, the accuracy of five thousandths can be achieved through the closed loop feedback control, waveform control is carried out based on a silicon controlled rectifier, waveform distortion is small, current output response is fast, a waveform can reach a preset value in the first half wave, and the four different power transformation circuit structures can be adapted to various working situations through transformation, including, but not limited to, instantaneous, time delay and other characteristic tests and calibration of a high-low voltage circuit breaker, leakage protection characteristic test and calibration of an electric leakage circuit breaker, calibration and test of an alternating current transformer and the like, and the practicability is higher.
Drawings
Some specific embodiments of the utility model will be described in detail hereinafter by way of example and not by way of limitation with reference to the accompanying drawings. The same reference numbers will be used throughout the drawings to refer to the same or like parts or portions. It will be appreciated by those skilled in the art that the drawings are not necessarily drawn to scale. In the accompanying drawings:
fig. 1 is a functional block diagram of an electronic load based ac constant current source according to one embodiment of the present utility model;
fig. 2 is a schematic circuit diagram of a power transformation circuit in an ac constant current source based on an electronic load according to an embodiment of the present utility model;
FIG. 3 is a schematic circuit diagram of a power transformation circuit in an electronic load based AC constant current source according to one embodiment of the utility model;
fig. 4 is a schematic circuit diagram of a power transformation circuit in an ac constant current source based on an electronic load according to an embodiment of the present utility model;
fig. 5 is a schematic circuit diagram of a power transformation circuit in an ac constant current source based on an electronic load according to an embodiment of the present utility model.
The reference numerals are as follows:
1. main transformer, 2, electronic load, 3, silicon controlled rectifier, 4, current transformer, 5, first auxiliary transformer, 6, second auxiliary transformer, 7, circuit breaker, 8, controllable contactor.
Detailed Description
The following description of the embodiments of the present utility model will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
The embodiment describes an alternating current constant current source based on an electronic load, as shown in fig. 1, and the alternating current constant current source comprises a power transformation circuit, a high-speed analog-to-digital conversion circuit and a controller, wherein the power transformation circuit adjusts current output through the electronic load arranged on the primary side of a transformer, the output current is collected through the high-speed analog-to-digital conversion circuit and is sent to the controller to form closed loop feedback control, and a main control end of the controller is electrically connected with the electronic load.
In an embodiment, as shown in fig. 2, the power transformation circuit includes a main transformer, an electronic load, a thyristor and a current transformer, the electronic load and the thyristor are all connected in series on a primary side of the main transformer, the current transformer is connected in series on a secondary side of the main transformer, the electronic load and the thyristor are respectively connected with a control end of the controller, an acquisition input end of the high-speed analog-to-digital conversion circuit is connected with the current transformer, an output end of the high-speed analog-to-digital conversion circuit is connected with a data acquisition end of the controller, and a secondary loop of the main transformer is an output loop. The tested product is connected in series with the secondary side (low-voltage high-current side) of the main transformer, and the uncertain impedance of the secondary side (low-voltage high-current side) of the main transformer is equivalent to the primary side (high-voltage side) by utilizing the impedance transformation principle of the transformer.
In addition, since the primary side (high voltage side) coil of the main transformer is connected in series with the electronic load, the current of the electronic load is controlled in real time, so that the secondary side loop current of the main transformer can be kept constant regardless of the secondary side (low voltage and high current side) loop impedance of the transformer. When the secondary side of the main transformer is open or the secondary side impedance is too large, primary side current control is possibly disturbed, as a result, primary side (high voltage side) loop current of the main transformer is zero, and secondary side (low voltage and high current side) current of the main transformer is also zero according to the transformer principle, so that constant current output in the testing process is also safe.
In another embodiment, the structure of the power transformation circuit is slightly different from that shown in fig. 2. As shown in fig. 3, a first auxiliary transformer is connected in series with the primary side of the main transformer for increasing the voltage of the primary circuit of the main transformer, and the auxiliary side of the first auxiliary transformer is connected in series with the primary circuit of the main transformer, and the primary side of the first auxiliary transformer is connected with the mains supply. Therefore, the voltage of the primary loop is increased and the rated power of the secondary loop in the main transformer is improved by connecting the first auxiliary transformer in series with the primary of the main transformer, so that the alternating current constant current source of the embodiment can be applied to a product scene with relatively large impedance.
In yet another embodiment, the structure of the power transformation circuit shown in fig. 3 is different from that of the power transformation circuit shown in fig. 3. As shown in fig. 4, a second auxiliary transformer is connected in series with the secondary side of the main transformer, the secondary side of the second auxiliary transformer is connected in series with the secondary circuit of the main transformer, and the electronic load is connected in series with the primary side of the second auxiliary transformer. That is, the position of the electronic load is changed, and on the basis that the structures of the original main transformer and the first auxiliary transformer are kept unchanged, a second auxiliary transformer is connected in series in the secondary loop of the main transformer, the original electronic load is connected to the secondary of the second auxiliary transformer, and the structure and the second structure have the same rated power value.
In addition, in order to realize the above three power transformer circuit configurations in one circuit, a configuration is adopted in which a plurality of contactors for controlling loop switching are provided in the primary loop and the secondary loop of each transformer in the power transformer circuit in addition to the power transformer circuit shown in fig. 4, and as shown in fig. 5, different power transformer circuits are realized by switching combinations of the contactors.
In order to realize the control of the main loop circuit, the commercial power is sequentially fed into an electronic load and a controllable contactor through a loop breaker and then is connected into a primary side coil of a main transformer through a controllable silicon, and a trigger control end of the controllable contactor is connected with a control end of the controller.
The high-speed analog-to-digital conversion circuit comprises a DAC conversion circuit and an ADC conversion circuit, wherein the input end of the ADC conversion circuit is connected with the current transformer, and the output end of the ADC conversion circuit is connected with the data acquisition end of the controller. The waveform signals output and controlled by the controller are changed by the DAC conversion circuit and then sent to the controllable silicon to serve as input control signals of the controllable silicon in the power transformation circuit, and the controller simultaneously collects real-time voltage waveforms of the mains supply in real time and is used for controlling the conduction angles of the controllable silicon switches, so that current outputs with different initial phase angles are obtained.
In each example of this embodiment, the electronic load is an alternating current electronic load of 1800W, and the controller controls the electronic load to generate a high-speed and high-precision current output. The transformation ratio of the main transformer is 400V/10V, the secondary loop of the main transformer is a system output loop, two current sensors of 500A/5000A are connected in the secondary loop of the main transformer, and the two current transformers are respectively subjected to analog-to-digital conversion by an ADC (analog-to-digital conversion) circuit in the high-speed analog-to-digital conversion circuit and then sent to the controller.
In summary, the ac constant current source based on the electronic load of the embodiment can achieve five thousandths of accuracy through closed loop feedback control, and performs waveform control based on the silicon controlled rectifier, so that waveform distortion is small, current output response is fast, waveform can reach a predetermined value in the first half wave, and four different power transformation circuit structures can be adopted through transformation, so that the ac constant current source based on the electronic load is applicable to various different working scenes, and practicability is higher.
The above embodiments are only for illustrating the technical concept and features of the present utility model, and are intended to enable those skilled in the art to understand the present utility model and to implement the same, but are not intended to limit the scope of the present utility model, and all equivalent changes or modifications made according to the spirit of the present utility model should be included in the scope of the present utility model.
Claims (6)
1. An alternating current constant current source based on an electronic load is characterized by comprising a power transformation circuit, a high-speed analog-to-digital conversion circuit and a controller, wherein,
the power transformation circuit comprises a main transformer, an electronic load, a silicon controlled rectifier and a current transformer, wherein the electronic load and the silicon controlled rectifier are connected in series on the primary side of the main transformer, the current transformer is connected in series on the secondary side of the main transformer, the electronic load and the silicon controlled rectifier are respectively connected with the control end of the controller, the acquisition input end of the high-speed digital-to-analog conversion circuit is connected with the current transformer, the output end of the high-speed digital-to-analog conversion circuit is connected with the data acquisition end of the controller, and the secondary loop of the main transformer is an output loop;
the primary side of the main transformer is connected in series with a first auxiliary transformer for increasing the voltage of a primary loop of the main transformer, the secondary side of the first auxiliary transformer is connected in series with the primary loop of the main transformer, the primary side of the first auxiliary transformer is connected with the mains supply, the secondary side of the main transformer is connected in series with a second auxiliary transformer, the secondary side of the second auxiliary transformer is connected in series with a secondary loop of the main transformer, and the electronic load is connected in series in the primary side of the second auxiliary transformer.
2. The ac constant current source according to claim 1, wherein a plurality of contactors for switching control loops are provided in a primary loop and a secondary loop of each transformer in the power transformer circuit.
3. The ac constant current source based on electronic load according to claim 1 or 2, wherein the commercial power is fed into the electronic load after passing through a circuit breaker and a controllable contactor in sequence, and the controllable silicon is then fed into the primary side coil of the main transformer, and the trigger control end of the controllable contactor is connected with a control end of the controller.
4. The electronic load based ac constant current source according to claim 1, wherein the high speed analog to digital conversion circuit comprises a DAC conversion circuit and an ADC conversion circuit, an input of the ADC conversion circuit is connected to the current transformer, and an output of the ADC conversion circuit is connected to the data acquisition terminal of the controller.
5. The ac constant current source according to claim 1, wherein said electronic load is an 1800W ac electronic load, and said controller controls said electronic load to produce a high-speed and high-precision current output.
6. The alternating current constant current source based on the electronic load according to claim 1, wherein the transformation ratio of the main transformer is 400V/10V, the secondary loop of the main transformer is a system output loop, two current sensors of 500A/5000A are connected in the secondary loop of the main transformer, and the two current transformers are respectively subjected to analog-digital conversion by an analog-digital conversion circuit in the high-speed analog-digital conversion circuit and then are sent to the controller.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2022201418255 | 2022-01-19 | ||
| CN202220141825 | 2022-01-19 |
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| Publication Number | Publication Date |
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| CN219676113U true CN219676113U (en) | 2023-09-12 |
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| CN202222615262.1U Active CN219676113U (en) | 2022-01-19 | 2022-10-01 | Alternating current constant current source based on electronic load |
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