CN218633705U - Intelligent constant current source - Google Patents
Intelligent constant current source Download PDFInfo
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- CN218633705U CN218633705U CN202223077488.7U CN202223077488U CN218633705U CN 218633705 U CN218633705 U CN 218633705U CN 202223077488 U CN202223077488 U CN 202223077488U CN 218633705 U CN218633705 U CN 218633705U
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Abstract
The utility model belongs to the technical field of the constant current source, concretely relates to intelligent constant current source, including MCU the control unit, the step-down the control unit, constant current output the control unit and voltage comparison feedback closed loop control unit, through the MCU unit, the step-down the control unit, constant current output the control unit, the current acquisition unit, with the cooperation setting of current comparison feedback closed loop control unit, MCU the control unit control PWM control signal inputs the constant current output the control unit to control the step-down the control unit to the input power step-down and drive the load, realized the effective constant current drive to the load; and the voltage comparison feedback closed-loop module processes the power output and feeds back the voltage reduction control unit, so that the precision of the output power is improved, and the power output can be properly turned off through feedback to avoid overheating.
Description
Technical Field
The utility model belongs to the technical field of the constant current source, concretely relates to intelligence constant current source.
Background
In the power supply controller in the prior art, due to the limitation of a circuit structure, the load driving capability is poor, the precision is low, an overheating phenomenon exists, and the use requirement cannot be met; therefore, it is desirable to develop a new power driver that overcomes the deficiencies of the prior art.
SUMMERY OF THE UTILITY MODEL
The to-be-solved technical problem of the utility model lies in overcoming the defect that among the prior art power supply controller load drive ability is poor and the precision is low to generate heat easily to an intelligence constant current source is provided.
An intelligent constant current source comprises an MCU control unit, a voltage reduction control unit, a constant current output control unit and a voltage comparison feedback closed loop control unit,
the MCU control unit is used for controlling the input of the PWM control signal;
the power output end of the voltage reduction control unit is connected with the load and used for reducing the voltage of the input power and driving the load;
the constant current output control unit is used for receiving the input of the PWM control signal and controlling the power output of the voltage reduction control unit;
and the voltage comparison feedback closed-loop control unit is used for processing the power output of the voltage reduction control unit and feeding back the processed power output to the voltage reduction control unit.
Further, the voltage reduction control unit comprises a voltage reduction chip, the voltage reduction chip comprises a power output end and a feedback end, and the power output end is connected with the load.
Further, the constant current output control unit comprises a first operational amplifier, an inverting input end of the first operational amplifier is connected with a PWM control signal input, and an output end of the first operational amplifier is connected with a feedback end of the voltage reduction chip.
Furthermore, the voltage comparison feedback closed-loop control unit comprises a current sampling resistor and a second operational amplifier, wherein the current sampling resistor is connected with one end of a negative pole of the load in series, the negative pole of the load is connected with a non-inverting input end of the second operational amplifier, and an output end of the second operational amplifier is connected with a non-inverting input end of the first operational amplifier.
Furthermore, the load current collector further comprises a current collecting unit, wherein the current collecting unit comprises a third operational amplifier, the in-phase input end of the third operational amplifier is connected with the negative electrode of the load, and the output end of the third operational amplifier is connected with the MCU control unit.
Furthermore, the energy storage device also comprises an energy storage inductor which is connected between the power output end of the voltage reduction control unit and a load in series.
Furthermore, the circuit further comprises a clamping circuit, and the clamping circuit is connected to the output end of the first operational amplifier.
Furthermore, the current-limiting filter circuit is connected to the non-inverting input end of the third operational amplifier.
Furthermore, the device also comprises a display, coding and key unit, wherein the display, coding and key unit is connected with the MCU control unit and is used for displaying information including current.
Furthermore, the device also comprises a local and remote function switching unit, an analog voltage remote control unit and a PWM remote control unit, wherein the analog voltage remote control unit and the PWM remote control unit are respectively connected with the local and remote function switching unit, and the local and remote function switching unit is respectively connected with the MCU control unit and the voltage reduction control unit and is used for switching the control mode of the constant current source.
Has the advantages that:
1. the utility model discloses a MCU unit, step-down the control unit, constant current output control unit, current acquisition unit and the cooperation setting of current comparison feedback closed loop control unit, MCU control unit control PWM control signal input constant current output control unit to control step-down the control unit and step down and drive the load to the input power, realized the effective constant current drive to the load; and the voltage comparison feedback closed-loop module processes the power output and feeds back the voltage reduction control unit, so that the precision of the output power is improved, and the power output can be properly turned off through feedback to avoid overheating.
2. The utility model can provide electric energy for the load when the power output is turned off by connecting an energy storage inductor between the power output end and the load in series, so that the load works in a normal state, and the constant current supply of the constant current source is further ensured; the clamping circuit is connected to the output end of the first operational amplifier, so that the potential output to the feedback end of the voltage reduction chip is clamped, and the voltage reduction chip is prevented from being damaged by overvoltage.
3. The utility model transmits the output power supply current to the MCU control unit through the arrangement of the current acquisition unit; the current limiting filter circuit is arranged, so that the effective transmission of the current data of the output power supply is ensured; and the collected output power supply current is displayed through display, coding and key unit setting.
4. The utility model discloses a local and remote function switching unit, analog voltage remote control unit and PWM remote control unit's cooperation setting can switch local and multiple remote control mode, the effective control constant current source in a flexible way.
Drawings
Fig. 1 is a schematic view of the overall structure of the present invention;
fig. 2 is a schematic diagram of a circuit structure of the voltage reduction control unit of the present invention;
fig. 3 is a schematic diagram of the circuit structure of the constant current output control unit of the present invention;
fig. 4 is a schematic diagram of the circuit structure of the voltage comparison feedback closed-loop control unit of the present invention;
fig. 5 is a schematic diagram of the circuit structure of the current collecting unit of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, 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, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment provides an intelligent constant current source, which comprises an MCU control unit, a voltage reduction control unit, a constant current output control unit and a voltage comparison feedback closed-loop control unit, wherein the MCU control unit is used for controlling the input of a PWM control signal; the power output end of the voltage reduction control unit is connected with the load and used for reducing the voltage of the input power and driving the load; the constant current output control unit is used for receiving the input of the PWM control signal and controlling the power output of the voltage reduction control unit; and the voltage comparison feedback closed-loop control unit is used for processing the power output of the voltage reduction control unit and feeding back the processed power output to the voltage reduction control unit.
Specifically, the voltage reduction control unit comprises a voltage reduction chip, wherein the voltage reduction chip comprises a power input end, a power output end, a feedback end, a grounding end and an internal voltage stabilizer bypass capacitor end; the power supply output end is connected with an energy storage resistor and a load in series; the 24V direct current power supply is connected with the power supply input end and is connected with the bypass capacitor end of the internal voltage stabilizer through a bypass capacitor; the grounding end is grounded; the voltage reduction chip is a DC-DC voltage reduction chip with the model number XL 4016.
The constant current output control unit comprises a first operational amplifier; the PWM control signal is connected with the inverting input end of the first operational amplifier through a current-limiting filter circuit, and the output end of the first operational amplifier is connected with the feedback end of the voltage reduction chip, so that the output of the voltage reduction chip is controlled; and the output end of the first operational amplifier is connected with a current-limiting resistor and a clamping circuit, the clamping circuit is used for connecting a diode to a 5V direct-current power supply in the forward direction, and the output of the first operational amplifier is clamped at 5V.
The voltage comparison feedback closed-loop control unit comprises a current sampling resistor and a second operational amplifier, wherein the current sampling resistor is connected in series with one end of a negative electrode of the load, one end of the negative electrode of the load is connected with a non-inverting input end of the second operational amplifier, and an output end of the second operational amplifier is connected with a non-inverting input end of the first operational amplifier.
The first operational amplifier, the second operational amplifier and the third operational amplifier are three independent operational amplifiers in four operational amplifiers respectively, and the model of the four operational amplifiers is LM324.
As a further improvement of this embodiment, the load control system further includes a current collection unit, where the current collection unit includes a third operational amplifier, a non-inverting input terminal of the third operational amplifier is connected to a negative electrode of the load through a current-limiting filter circuit, and an output terminal of the third operational amplifier is connected to the MCU control unit through another current-limiting filter circuit; the current-limiting filter circuit comprises a current-limiting resistor and a grounded filter capacitor which are connected in series.
The MCU control unit is connected with the display, coding and key unit and used for displaying information including the acquired power output current.
The device is characterized by further comprising a local and remote function switching unit, an analog voltage remote control unit and a PWM remote control unit, wherein the analog voltage remote control unit and the PWM remote control unit are respectively connected with the local and remote function switching unit, and the local and remote function switching unit is respectively connected with the MCU control unit and the voltage reduction control unit and is used for switching the control mode of the constant current source.
The remote control device also comprises a 485 remote control unit which is connected with the MCU control unit and used for remotely controlling the constant current source through an RS-485 protocol.
The working principle is as follows: when the PWM control signal is input to a high level, the output end of the first operational amplifier outputs a 12V high level, and outputs a 5V high level to the feedback end of the voltage reduction chip through the clamping circuit and the current limiting resistor, wherein the voltage of the feedback end is higher than 1.25V, the power supply output end is disconnected, and no current passes through a load; when a PWM signal is input into a low level, the output end of the first operational amplifier outputs 0V to the feedback end of the voltage reduction chip, the voltage of the feedback end is lower than 1.25V, the power output end is conducted, and the 24V voltage of the power output end is output from the power output end and flows to a load through the energy storage inductor; when current flows through a load, voltage drop is generated at two ends of a current sampling resistor and is input to a non-inverting input end of a second operational amplifier, the non-inverting input end of the first operational amplifier is output after amplification, the non-inverting input end of the first operational amplifier is compared with a PWM control signal input by a non-inverting input end, when the voltage of the non-inverting input end is higher than that of the inverting input end, the output end of the first operational amplifier outputs a high level, and when the voltage of the non-inverting input end is lower than that of the inverting input end, the output end of the first operational amplifier outputs a low level and feeds the low level back to a feedback end of a voltage reduction chip for controlling the on-off of a voltage output end; when the power output end is switched on, the energy storage inductor is charged, and when the power output end is switched off, the energy storage inductor discharges to provide energy for the load, and the load can work normally all the time.
And the other path of the voltage drop output of the current sampling resistor is output to the in-phase input end of a third operational amplifier through a current-limiting filter circuit, and the output end of the third operational amplifier is amplified and is sent to an MCU control unit through another current-limiting filter circuit for calculation and display.
The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the technical field of the utility model, without departing from the concept of the invention, can also make a plurality of equal substitution or obvious variants, and the performance or the usage is the same, should all be regarded as belonging to the utility model's protection within the scope.
Claims (10)
1. An intelligent constant current source is characterized by comprising an MCU control unit, a voltage reduction control unit, a constant current output control unit and a voltage comparison feedback closed loop control unit,
the MCU control unit is used for controlling the input of the PWM control signal;
the power output end of the voltage reduction control unit is connected with the load and used for reducing the voltage of the input power and driving the load;
the constant current output control unit is used for receiving the input of the PWM control signal and controlling the power output of the voltage reduction control unit;
and the voltage comparison feedback closed-loop control unit is used for processing the power output of the voltage reduction control unit and feeding back the processed power output to the voltage reduction control unit.
2. The intelligent constant current source of claim 1, wherein the buck control unit comprises a buck chip, the buck chip comprising a power output and a feedback terminal, the power output being connected to a load.
3. The intelligent constant current source of claim 2, wherein the constant current output control unit comprises a first operational amplifier, an inverting input terminal of the first operational amplifier is connected with a PWM control signal input, and an output terminal of the first operational amplifier is connected with a feedback terminal of the voltage reduction chip.
4. The intelligent constant current source of claim 3, wherein the voltage comparison feedback closed-loop control unit comprises a current sampling resistor and a second operational amplifier, the current sampling resistor is connected in series with one end of the negative pole of the load, the negative pole of the load is connected with the non-inverting input end of the second operational amplifier, and the output end of the second operational amplifier is connected with the non-inverting input end of the first operational amplifier.
5. The intelligent constant current source of claim 4, further comprising a current collection unit, wherein the current collection unit comprises a third operational amplifier, a non-inverting input terminal of the third operational amplifier is connected to a negative electrode of the load, and an output terminal of the third operational amplifier is connected to the MCU control unit.
6. The intelligent constant current source of claim 1, further comprising an energy storage inductor, wherein the energy storage inductor is connected in series between the power output terminal of the voltage-reducing control unit and the load.
7. The intelligent constant current source of claim 3, further comprising a clamp circuit connected to an output of the first operational amplifier.
8. The intelligent constant current source of claim 5, further comprising a current limiting filter circuit connected to the non-inverting input of the third operational amplifier.
9. The intelligent constant current source of claim 1, further comprising a display and coding and key unit, wherein the display and coding and key unit is connected with the MCU control unit for displaying information including current.
10. The intelligent constant current source of claim 1, further comprising a local and remote function switching unit, an analog voltage remote control unit and a PWM remote control unit, wherein the analog voltage remote control unit and the PWM remote control unit are respectively connected to the local and remote function switching unit, and the local and remote function switching unit is respectively connected to the MCU control unit and the voltage reduction control unit for switching the control mode of the constant current source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223077488.7U CN218633705U (en) | 2022-11-21 | 2022-11-21 | Intelligent constant current source |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223077488.7U CN218633705U (en) | 2022-11-21 | 2022-11-21 | Intelligent constant current source |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218633705U true CN218633705U (en) | 2023-03-14 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202223077488.7U Active CN218633705U (en) | 2022-11-21 | 2022-11-21 | Intelligent constant current source |
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| CN (1) | CN218633705U (en) |
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- 2022-11-21 CN CN202223077488.7U patent/CN218633705U/en active Active
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