CN220438808U - Industrial high-power constant current source circuit - Google Patents
Industrial high-power constant current source circuit Download PDFInfo
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- CN220438808U CN220438808U CN202321574043.1U CN202321574043U CN220438808U CN 220438808 U CN220438808 U CN 220438808U CN 202321574043 U CN202321574043 U CN 202321574043U CN 220438808 U CN220438808 U CN 220438808U
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- 238000001514 detection method Methods 0.000 claims abstract description 8
- 238000005070 sampling Methods 0.000 claims description 13
- 230000001276 controlling effect Effects 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 claims 1
- 230000033228 biological regulation Effects 0.000 abstract description 3
- 230000003139 buffering effect Effects 0.000 abstract description 3
- 238000012544 monitoring process Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 3
- 230000017525 heat dissipation Effects 0.000 description 3
- 238000009776 industrial production Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000001962 electrophoresis Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
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Abstract
The utility model belongs to the technical field of power, an industrial high-power constant current source circuit is disclosed, including basic constant current source circuit, benchmark source circuit and protection circuit, basic constant current source circuit includes the Howlan configuration current source of constituteing by differential amplifier and operational amplifier, benchmark source circuit includes benchmark source chip, voltage follower and DAC circuit, benchmark source chip is used for providing the benchmark power, get into DAC circuit after voltage follower buffering, DAC circuit produces direct current signal access basic constant current source circuit after control voltage regulation, protection circuit includes power slow start circuit and current detection circuit, power slow start circuit is used for realizing the slow start and the slow landing of power, current detection circuit is used for detecting the later stage load trouble. The current load of the application can reach more than 2A, the error can be controlled within 10uA, the current change can be responded within us level, and the power supply parameters required by most sensors and equipment in the industrial field of users are met.
Description
Technical Field
The application relates to the technical field of power supplies, in particular to an industrial high-power constant current source circuit.
Background
An industrial constant current source is a power supply device whose main function is to limit the current to a constant value. In industrial production, constant current sources are commonly used to control the speed of motors, the brightness of lighting devices, the current of gas discharge tubes, the current of electrophoresis devices, and the like. In modern industrial production, various devices and control systems need stable and high-quality power supply, so that a high-power industrial constant current source plays a very important role.
The working principle of the constant current source is that the power supply voltage is controlled by a circuit, so that the output current is always kept at a preset constant value. Constant current sources typically include a feedback circuit for sensing the output current and automatically adjusting the input voltage to maintain a constant current output. The current common constant current source circuit has insufficient control precision and flexibility, and is difficult to meet the use of a high-power industrial circuit.
Disclosure of Invention
In order to solve the problems, the application provides an industrial high-power constant current source circuit.
The industrial high-power constant current source circuit adopts the following technical scheme:
the utility model provides an industry high-power constant current source circuit, includes basic constant current source circuit, benchmark source circuit and protection circuit, basic constant current source circuit includes the Howlan configuration current source that comprises differential amplifier and operational amplifier, benchmark source circuit includes benchmark source chip, voltage follower and DAC circuit, benchmark source chip is used for providing the benchmark power, gets into DAC circuit after voltage follower buffering, DAC circuit produces direct current signal access basic constant current source circuit after control voltage regulation, protection circuit includes power slow start circuit and current detection circuit, power slow start circuit is used for realizing the slow start and the slow landing of power, current detection circuit is used for detecting later stage load trouble.
Further, the protection circuit comprises a sampling resistor, one end of the sampling resistor is connected with a power load end and an operational amplifier, the other end of the sampling resistor is connected with a drain electrode of the MOS tube, an output end of the operational amplifier is connected with an MCU, a grid electrode of the MOS tube is connected with a MOS tube driving chip, and a signal output pin of the MCU is connected with a signal input end of the MOS tube driving chip.
According to the technical scheme, the sampling resistor is used for collecting power load backflow, the sampling resistor is amplified by the operational amplifier to generate a monitoring voltage, the monitoring voltage is sent to the MCU for current monitoring, the monitoring voltage is compared with the preset voltage, and when the monitoring voltage is larger than the preset voltage, a high-level signal is generated, and the signal drives the low-side MOS tube to turn off the cut-off circuit loop through the MOS tube driving chip, so that power protection is achieved.
Further, the differential amplifier is an AD8276 chip.
Through the technical scheme, the temperature drift of the AD8276 chip is 1 ppm/DEG C, the offset voltage drift is 2 uV/DEG C, and errors caused by the coefficient K and the PCB can be reduced by the built-in laser adjusting resistor, so that the current change of the driving current 2A and the uA level can be met, and the application of most of equipment and sensors on the industrial site can be met.
Further, the DAC circuit chip is AD5791B.
Through the technical scheme, the accuracy of the output of the DAC chip is higher, the change of the uV level can be realized, and the thermal stability of the current can be ensured through the measure of good heat dissipation on the PCB of the circuit.
In summary, the present application includes at least one of the following beneficial technical effects:
(1) The driving current is larger, and the conventional PCB and heat dissipation treatment can drive a power device with the voltage of more than 30V/2A;
(2) The adjustment precision is high, the current in the range of 0-2A can be dynamically adjusted, and the uA level can be realized by adjusting the progress;
(3) The protection circuit responds rapidly, and can respond to the power supply overcurrent protection in real time and cut off the power supply protection equipment in time.
Drawings
FIG. 1 is a schematic structural diagram of the present application;
FIG. 2 is a schematic diagram of a basic constant current source circuit;
FIG. 3 is a reference source circuit schematic;
fig. 4 is a schematic diagram of a protection circuit.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application; it is apparent that the described embodiments are only a part of the embodiments of the present application, not all of the embodiments, and all other embodiments obtained by a person having ordinary skill in the art without making creative efforts based on the embodiments in the present application are within the scope of protection of the present application.
In the description of the present application, it should be noted that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "top/bottom", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of description of the present application and to simplify the description, and do not indicate or imply that the devices or elements to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "configured to," "engaged with," "connected to," and the like are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
Example 1:
the present application is described in further detail below in conjunction with figures 1-4.
The embodiment of the application discloses high-power constant current source circuit of industry, including basic constant current source circuit, benchmark source circuit and protection circuit, basic constant current source circuit includes the Howlan configuration current source of constituteing by differential amplifier and operational amplifier, benchmark source circuit includes benchmark source chip, voltage follower and DAC circuit, benchmark source chip is used for providing the benchmark power, get into DAC circuit after voltage follower buffering, DAC circuit produces direct current signal access basic constant current source circuit after control voltage regulation, protection circuit includes power slow start circuit and current detection circuit, power slow start circuit is used for realizing the slow start and the slow landing of power, current detection circuit is used for detecting later stage load trouble.
The Hao Lande (Howlan) circuit used by the basic current source is a load grounding constant current source, the output capacity is good, the temperature offset is small, but the problems of stability and the like caused by problems of resistance matching and working points exist, the differential amplifier built-in laser adjustment resistor used by the design has strict resistance matching, the errors caused by PCB layout and resistance matching can be avoided, and the output current Io=Vref/R1; (wherein Vref is the reference voltage of DAC output, R1 is sampling resistor).
Referring to fig. 4, the protection circuit includes a sampling resistor, one end of the sampling resistor is connected to a power load end and an operational amplifier, the other end is connected to a drain electrode of the MOS transistor, an output end of the operational amplifier is connected to the MCU, a gate electrode of the MOS transistor is connected to the MOS transistor driving chip, and a signal output pin of the MCU is connected to a signal input end of the MOS transistor driving chip. The sampling resistor is used for collecting power supply load reflux, a monitoring voltage is generated after the sampling resistor is amplified by the operational amplifier and is sent to the MCU for current monitoring, the monitoring voltage is compared with a preset voltage, a high-level signal is generated after the monitoring voltage is greater than the preset voltage, and the signal drives the low-side MOS tube to turn off the cut-off circuit loop through the MOS tube driving chip, so that power supply protection is realized. Compared with the traditional MOS tube control circuit, the high-current MOS tube used by the power supply loop has larger parasitic capacitance, so that the high-current MOS tube cannot be timely and quickly turned off when the low-side MOS tube is turned off, and the high-current MOS tube can be turned off within 25ns through the MOS tube driving chip to realize real-time response of power supply protection.
FIG. 2 is a basic constant current source circuit design of the utility model, which utilizes the excellent characteristics of the differential amplifier AD8276 chip that the temperature drift is 1 ppm/DEG C and the offset voltage drift is 2 uV/DEG C, and the built-in laser adjusting resistor can reduce the error caused by the coefficient K and the PCB cloth board, can meet the current change of the driving current 2A and uA level, and can meet the application of most of equipment and sensors in the industrial field.
Fig. 3 is a reference source circuit of the present utility model. The reference source outputs a 5V reference power supply, the reference power supply is amplified and buffered by an operational amplifier and then is sent to the DAC chip AD5791B, and the DAC chip produces voltage to drive the post constant current source circuit. The DAC chip has higher output precision, can realize uV level change, and can ensure the heat stability of current by performing good heat dissipation on the PCB of the circuit.
The foregoing are all preferred embodiments of the present application, and are not intended to limit the scope of the present application in any way, therefore: all equivalent changes in structure, shape and principle of this application should be covered in the protection scope of this application.
Claims (4)
1. An industrial high-power constant current source circuit is characterized in that: the circuit comprises a basic constant current source circuit, a reference source circuit and a protection circuit, wherein the basic constant current source circuit comprises a Howlan configuration current source composed of a differential amplifier and an operational amplifier, the reference source circuit comprises a reference source chip, a voltage follower and a DAC circuit, the reference source chip is used for providing a reference power supply, the reference source chip enters the DAC circuit after being buffered by the voltage follower, the DAC circuit generates a direct current signal after controlling and regulating voltage to be connected with the basic constant current source circuit, the protection circuit comprises a power supply slow starting circuit and a current detection circuit, the power supply slow starting circuit is used for realizing slow starting and slow dropping of a power supply, and the current detection circuit is used for detecting a later-stage load fault.
2. The industrial high-power constant current source circuit according to claim 1, wherein: the protection circuit comprises a sampling resistor, one end of the sampling resistor is connected with a power load end and an operational amplifier, the other end of the sampling resistor is connected with a drain electrode of the MOS tube, an output end of the operational amplifier is connected with an MCU, a grid electrode of the MOS tube is connected with a MOS tube driving chip, and a signal output pin of the MCU is connected with a signal input end of the MOS tube driving chip.
3. The industrial high-power constant current source circuit according to claim 1, wherein: the differential amplifier is an AD8276 chip.
4. The industrial high-power constant current source circuit according to claim 1, wherein: the DAC circuit chip is AD5791B.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321574043.1U CN220438808U (en) | 2023-06-20 | 2023-06-20 | Industrial high-power constant current source circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321574043.1U CN220438808U (en) | 2023-06-20 | 2023-06-20 | Industrial high-power constant current source circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220438808U true CN220438808U (en) | 2024-02-02 |
Family
ID=89696451
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321574043.1U Active CN220438808U (en) | 2023-06-20 | 2023-06-20 | Industrial high-power constant current source circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220438808U (en) |
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2023
- 2023-06-20 CN CN202321574043.1U patent/CN220438808U/en active Active
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