CN219435263U - Constant current source device - Google Patents
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- CN219435263U CN219435263U CN202320500483.6U CN202320500483U CN219435263U CN 219435263 U CN219435263 U CN 219435263U CN 202320500483 U CN202320500483 U CN 202320500483U CN 219435263 U CN219435263 U CN 219435263U
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Abstract
The utility model relates to a constant current source device, which comprises a DC-DC conversion circuit and a switching tube which are sequentially connected, wherein the input end of the DC-DC conversion circuit is connected with a power supply, and the output end of the DC-DC conversion circuit is connected with the input pole of the switching tube; the output electrode of the switching tube is connected with the output end of the constant current source device, and the control electrode of the switching tube is connected with the current control circuit; the current control circuit comprises a current sampling circuit and a comparison circuit which are sequentially connected, the current sampling circuit is connected with the output end of the constant current source device, and the output end of the comparison circuit is connected with the control electrode of the switching tube; the constant current source device also comprises a voltage control circuit, wherein one input end of the voltage control circuit is connected with the output end of the DC-DC conversion circuit, the other input end of the voltage control circuit is connected with the output end of the constant current source device, and the output end of the voltage control circuit is connected with the voltage feedback end of the DC-DC conversion circuit. The scheme of the utility model can simultaneously regulate the output voltage and the output current of the constant current source device, thereby realizing high-precision constant current regulation and reducing power loss.
Description
Technical Field
The utility model relates to the technical field of electronics in general, in particular to a constant current source device.
Background
The DC constant current power supply is a DC power supply which can provide stable output current when the power supply voltage and other influencing variables are changed within a certain range. The high-precision broad-spectrum constant-current power supply has the advantages of quick response, high-precision constant current and long-term stable operation, and is suitable for various loads (resistive, inductive and capacitive). The method is widely applied to direct current power supply display systems, industrial control, communication, scientific research, energy storage and other devices.
At present, although the DC/DC constant current power supplies in the market have various types, the adjustment precision is not enough, and the output voltage and the output current cannot be adjusted at the same time, so that the power loss is serious.
Disclosure of Invention
In order to solve the technical problems in the prior art, the utility model provides a constant current source device for simultaneously regulating the output voltage and the output current of a constant current power supply, and the constant current source device is matched with the constant current source device to realize the constant current function with high efficiency so as to reduce the power loss.
The utility model provides a constant current source device, comprising: the DC-DC conversion circuit is connected with the power supply, and the output end of the DC-DC conversion circuit is connected with the input electrode of the switching tube; the output electrode of the switching tube is connected with the output end of the constant current source device, and the control electrode of the switching tube is connected with the current control circuit; the current control circuit comprises a current sampling circuit and a comparison circuit which are sequentially connected, the current sampling circuit is connected with the output end of the constant current source device, and the output end of the comparison circuit is connected with the control electrode of the switching tube; the constant current source device also comprises a voltage control circuit, wherein one input end of the voltage control circuit is connected with the output end of the DC-DC conversion circuit, the other input end of the voltage control circuit is connected with the output end of the constant current source device, and the output end of the voltage control circuit is connected with the voltage feedback end of the DC-DC conversion circuit.
In one embodiment, the switching tube is a MOS tube, a gate of the MOS tube is connected to the current control circuit, a drain of the MOS tube is connected to the output end of the DC-DC conversion circuit, and a source of the MOS tube is connected to the current sampling circuit.
In one embodiment, the sampling circuit comprises a sampling resistor connected with the source electrode of the MOS tube and an inverse proportion amplifying circuit connected with the sampling resistor; the inverse proportion amplifying circuit comprises an operational amplifier, wherein the inverting input end of the operational amplifier is connected with the sampling resistor, the non-inverting input end of the operational amplifier is grounded, and the output end of the operational amplifier is connected with the comparing circuit.
In one embodiment, the comparing circuit includes a comparator, an inverting input terminal of the comparator is connected to an output terminal of the inverse proportion amplifying circuit, a non-inverting input terminal of the comparator is connected to a reference voltage input terminal, and an output terminal of the comparator is connected to a gate of the MOS transistor.
In one embodiment, the voltage control circuit includes a voltage sampling circuit, an operational amplifier and a photo-coupler, wherein the voltage sampling circuit samples the drain voltage and the source voltage of the MOS transistor and inputs them into the in-phase input terminal and the anti-phase input terminal of the operational amplifier, the output terminal of the operational amplifier is connected to the input terminal of the photo-coupler, and the output terminal of the photo-coupler is connected to the voltage feedback terminal of the DC-DC conversion circuit.
In one embodiment, an input filter circuit is further included, wherein the input filter circuit includes an inductor and a capacitor, the input filter circuit being connected to the input of the DC-DC conversion circuit.
In one embodiment, the DC-DC converter further comprises an output filter circuit, wherein the output filter circuit comprises a capacitor, the output filter circuit being connected between the DC-DC converter circuit and the inverse proportional amplifying circuit.
In one embodiment, the input anti-reverse circuit comprises a diode, and the input anti-reverse circuit is connected between the power supply and the input filter circuit.
In one embodiment, the DC-DC conversion circuit includes a main conversion circuit, a first auxiliary conversion circuit, and a second auxiliary conversion circuit connected in parallel with each other, wherein an output end of the main conversion circuit is connected to a drain of the MOS transistor, an output end of the first auxiliary conversion circuit is connected to a positive power supply end of the operational amplifier in the inverse proportion amplifying circuit, a positive power supply end of the comparator in the comparing circuit, and a positive power supply end of the operational amplifier in the voltage control circuit, and an output end of the second auxiliary conversion circuit is connected to a negative power supply end of the operational amplifier in the inverse proportion amplifying circuit, a negative power supply end of the comparator in the comparing circuit, and an input end of the photocoupler in the voltage control circuit.
In one embodiment, the reference voltage input is connected to the MCU.
The technical scheme of the utility model has the following beneficial technical effects:
the constant current source device provided by the utility model can simultaneously regulate the output voltage and the output current of the constant current power supply, and realize the constant current function in a high-efficiency matching way, thereby achieving the purpose of reducing the power loss.
Drawings
The above, as well as additional purposes, features, and advantages of exemplary embodiments of the present utility model will become readily apparent from the following detailed description when read in conjunction with the accompanying drawings. In the drawings, embodiments of the utility model are illustrated by way of example and not by way of limitation, and like reference numerals refer to similar or corresponding parts and in which:
fig. 1 is a schematic diagram of the composition of a constant current source device according to an embodiment of the present utility model;
fig. 2 is a circuit schematic diagram of an input anti-reverse connection circuit, an input filter circuit, a DC-DC conversion circuit, and an output filter circuit of the constant current source device according to an embodiment of the present utility model;
fig. 3 is a circuit schematic of a reverse-scaling circuit and a comparison circuit of a constant current source device according to an embodiment of the present utility model;
fig. 4 is a circuit schematic of a voltage control circuit of a constant current source device according to an embodiment of the present utility model.
Detailed Description
The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the utility model. 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.
It should be understood that when the terms "first," "second," and the like are used in the claims, the specification and the drawings of the present utility model, they are used merely for distinguishing between different objects and not for describing a particular sequential order. The terms "comprises" and "comprising" when used in the specification and claims of the present utility model are taken to specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
The utility model provides a constant current source device, comprising: the DC-DC conversion circuit is connected with the power supply to input direct-current voltage, and the output end of the DC-DC conversion circuit is connected with the input electrode of the switching tube; the output electrode of the switching tube is connected with the output end of the constant current source device to output direct voltage and direct current, and the control electrode of the switching tube is connected with the current control circuit.
The current control circuit comprises a current sampling circuit and a comparison circuit which are sequentially connected, the current sampling circuit is connected with the output end of the constant current source device to sample the output current of the constant current source device, the output end of the comparison circuit is connected with the control electrode of the switching tube to control the gate driving voltage of the switching tube according to the comparison result of the comparison circuit, and the impedance of the switching tube is adjusted, so that the output current of the constant current source device is adjusted.
The constant current source device also comprises a voltage control circuit, wherein one input end of the voltage control circuit is connected with the output end of the DC-DC conversion circuit, the other input end of the voltage control circuit is connected with the output end of the constant current source device, and the output end of the voltage control circuit is connected with the voltage feedback end of the DC-DC conversion circuit so as to control the output voltage of the DC-DC conversion circuit.
In some embodiments, the switching tube is a MOS tube, for example, a linear MOS tube, a gate of the MOS tube is connected to the current control circuit, a drain of the MOS tube is connected to the output end of the DC-DC conversion circuit, and a source of the MOS tube is connected to the current sampling circuit.
In some embodiments, the sampling circuit comprises a sampling resistor connected with the source electrode of the MOS tube and an inverse proportion amplifying circuit connected with the sampling resistor; the inverse proportion amplifying circuit comprises an operational amplifier, wherein the inverting input end of the operational amplifier is connected with the sampling resistor, the non-inverting input end of the operational amplifier is grounded, and the output end of the operational amplifier is connected with the comparing circuit so as to amplify the sampling voltage of the sampling resistor in an inverse proportion.
In some embodiments, the comparing circuit includes a comparator, an inverting input terminal of the comparator is connected to an output terminal of the inverse proportion amplifying circuit, a non-inverting input terminal of the comparator is connected to a reference voltage input terminal, and an output terminal of the comparator is connected to a gate of the MOS transistor. The comparison circuit is used for comparing the sampling voltage inversely proportional amplified by the inversely proportional amplifying circuit with the reference voltage input by the reference voltage input end and outputting the comparison result to the MOS tube. In some embodiments, the reference voltage input end is connected to the MCU, so that the output dc of the constant current source device is adjusted according to the reference voltage.
In some embodiments, the voltage control circuit includes a voltage sampling circuit, an operational amplifier and a photo-coupler, where the voltage sampling circuit samples a drain voltage and a source voltage of the MOS transistor and inputs them into a non-inverting input terminal and an inverting input terminal of the operational amplifier, respectively, an output terminal of the operational amplifier is connected to an input terminal of the photo-coupler, and an output terminal of the photo-coupler is connected to the voltage feedback terminal of the DC-DC conversion circuit. The voltage control circuit is used for controlling the output voltage of the DC-DC conversion circuit to gradually decrease when the constant current source device outputs constant current, so that the power loss of the MOS tube is reduced.
In some embodiments, the constant current source device further comprises an input filter circuit, wherein the input filter circuit comprises an inductor and a capacitor, the input filter circuit being connected to the input of the DC-DC conversion circuit. The input filter circuit is used for filtering alternating current components in the input voltage.
In some embodiments, the constant current source device further comprises an output filter circuit, wherein the output filter circuit comprises a capacitor, the output filter circuit being connected between the DC-DC conversion circuit and the inverse proportional amplification circuit. The output filter circuit is used for filtering alternating current components in the output voltage of the constant current source device.
In some embodiments, the constant current source device further comprises an input anti-reverse circuit, wherein the input anti-reverse circuit comprises a diode, the input anti-reverse circuit connected between the power supply and the input filter circuit. The input reverse connection preventing circuit is used for preventing the fault of a later-stage circuit caused by reverse connection of the anode and the cathode.
In some embodiments, the DC-DC conversion circuit includes a main conversion circuit, a first auxiliary conversion circuit, and a second auxiliary conversion circuit connected in parallel with each other, wherein an output terminal of the main conversion circuit is connected to a drain of the MOS transistor, an output terminal of the first auxiliary conversion circuit is connected to a positive power supply terminal of the operational amplifier in the inverse proportion amplifying circuit, a positive power supply terminal of the comparator in the comparing circuit, and a positive power supply terminal of the operational amplifier in the voltage control circuit, and an output terminal of the second auxiliary conversion circuit is connected to a negative power supply terminal of the operational amplifier in the inverse proportion amplifying circuit, a negative power supply terminal of the comparator in the comparing circuit, and an input terminal of the photo coupler in the voltage control circuit, thereby supplying power to the operational amplifier, the comparator, and the photo coupler.
The constant current source device provided by the utility model can simultaneously regulate the output voltage and the output current of the constant current power supply, and realize the constant current function in a high-efficiency matching way, thereby achieving the purpose of reducing the power loss.
The technical scheme of the present utility model is described in detail below in connection with specific embodiments.
Fig. 1 is a schematic diagram of the composition of a constant current source device according to an embodiment of the present utility model. As shown in fig. 1, the illustrated constant current source device includes an input anti-reverse connection circuit 1, an input filter circuit 2, a DC-DC conversion circuit 3, a current control circuit 4, an output filter circuit 5, and a voltage control circuit 8, wherein the current control circuit 4 includes a current sampling circuit 6 and a comparison circuit 7.
Fig. 2 is a circuit schematic diagram of an input anti-reverse connection circuit, an input filter circuit, a DC-DC conversion circuit, an output filter circuit, and a current sampling circuit of the constant current source device according to an embodiment of the present utility model.
As shown in fig. 2, the input reverse connection preventing circuit 1 includes a reverse connection preventing diode D1 for preventing the power supply from being damaged by reverse connection of the positive and negative electrodes.
The input filter circuit 2 includes common mode inductances L1, L2, L3 and filter capacitances C1, C2, C4, C6. The common-mode inductor L1 of the filter circuit 2 is connected with the filter capacitors C1 and C2, the common-mode inductor L2 is connected with the filter capacitor C4, the common-mode inductor L3 is connected with the filter capacitor C6 and is respectively connected with the input ends of the corresponding conversion circuits, and the common-mode inductor L1 is used for filtering alternating current components in input voltage so that the voltage input into the DC-DC conversion circuit 3 is stable and has no surge peak.
The DC-DC conversion circuit 3 includes three conversion circuits: a main conversion circuit for providing an output voltage of +28V; a first auxiliary conversion circuit for providing an output voltage of +5V; and a second auxiliary conversion circuit for providing an output voltage of-5V. The DC-DC converter circuit 3 has a front stage connected to the reverse connection preventing diode, the input filter inductor and the capacitor, and a rear stage connected to the output filter capacitor and to the voltage control circuit 8.
The +28V path of the output filter circuit 5 comprises capacitors C7, C8 and C9 which are connected in parallel, the front stage is connected with a main conversion circuit, and the rear stage is connected with a linear MOS tube Q1 with the voltage drop of 1.4V; the output +5V path comprises a capacitor C3, the output-5V path comprises a capacitor C5, the front stage of the output +5V path is respectively connected with the first auxiliary conversion circuit and the second auxiliary conversion circuit, and the rear stage of the output +5V path is connected with the rear stage circuit to supply power to the output +5V path.
The current sampling circuit 6 includes a current sampling resistor RT1. The MOS tube Q1 is connected in series in the +28V path of the output filter circuit 5, the drain electrode is connected with the main conversion circuit, the source electrode outputs 28V/20A constant current source through the current sampling resistor RT1, and the grid electrode is connected with the current control circuit 4.
Fig. 3 is a circuit schematic of a reverse-scaling circuit and a comparison circuit of a constant current source device according to an embodiment of the present utility model.
The inverse proportion amplifying circuit 9 and the current sampling resistor RT1 together form a current sampling circuit 6 for outputting current of the MOS tube Q1. As shown in fig. 3, the inverse proportion amplifying circuit 9 includes an operational amplifier U1A, a capacitor C11, and resistors R3, R6. The 1 foot of the operational amplifier U1A is connected with the comparison circuit 7, the 2 foot of the operational amplifier U1A is connected with the resistor R6 and the capacitor C11, the other end of the capacitor C11 is grounded, the 3 foot of the operational amplifier U1A is connected with the resistor R3, one end of the resistor R13 is connected with the 2 foot of the operational amplifier U1A, and the other end is connected with the 1 foot of the operational amplifier U1A.
The comparison circuit 7 includes a comparator U1B, resistors R1, R2, R5, R9, R12, R4, R8, and capacitors C10, C12, C13. The pin 5 of the comparator U1B is connected with the reference voltage input end KZ+ through the resistors R5 and R2 so as to input the reference voltage, the direct current voltage 0-5V input by the KZ+ port corresponds to the output current 0-20A, and the port is in butt joint with the MCU so as to realize constant current regulation of the output current. The resistor R1 is connected in parallel with the capacitor C10, and one end thereof is grounded, and the other end thereof is connected with the resistors R2 and R5. The 6 pin of the comparator U1B is connected with the 1 pin of the operational amplifier U1A through a resistor R9. The resistor R12 is connected in series with the capacitor C12, and the resistor R12 is connected in parallel with the capacitor C13 after being connected in series with the capacitor C12 and is connected between the 6 pin and the 7 pin of the comparator U1B. And pin 7 of U1B is connected with the grid electrode of the MOS tube Q1 through a resistor R4.
The inverse proportion amplifying circuit 9 samples the output current through the current sampling resistor RT1, and the output current is transmitted to the comparison circuit 7 to be compared with the reference voltage after inverse proportion amplification, so that the grid driving voltage of the linear MOS tube Q1 is controlled, the impedance of the MOS tube is regulated, and the output current is regulated.
Specifically, when the output current is higher than 20A, the voltage collected by the sampling resistor is sent to the 2 pin of the operational amplifier U1A, after inverse proportion amplification, the voltage of the 1 pin of the operational amplifier U1A is reduced, after comparison by the comparator U1B, the voltage of the 7 pin of the comparator U1B is reduced, namely, the driving voltage of the MOS transistor Q1 is reduced, the internal resistance is increased, the output current is reduced, and the output voltage is reduced. On the contrary, when the output current is lower than 20A, the voltage collected by the sampling resistor is sent to the 2 pin of the operational amplifier U1A, after inverse proportion amplification, the voltage of the 1 pin of the operational amplifier U1A is increased, after comparison by the comparator U1B, the voltage of the 7 pin of the comparator U1B is increased, namely the driving voltage of the MOS tube Q1 is increased, the internal resistance is reduced, the output current is increased, and the output voltage is increased.
Fig. 4 is a circuit schematic of a voltage control circuit of a constant current source device according to an embodiment of the present utility model.
As shown in fig. 4, the voltage control circuit 8 includes an operational amplifier U2A, diodes D2, D3, an optocoupler U3, resistors R7, R10, R11, R15, R16, R14, R18, R17, and capacitors C14, C15. And the 1 pin of the operational amplifier U2A is connected with the 1 pin of the optocoupler U3 through a resistor R11. The resistor R14 and the capacitor C14 are connected in series and then connected in parallel with the resistor R18, and are connected between the 1 pin and the 2 pin of the operational amplifier U2A. Diodes D2 and D3 are connected in series with resistors R10 and R15, the anode of diode D2 is connected with the drain electrode of MOS transistor Q1, and the cathode of diode D3 is connected with the 3 pin of operational amplifier U2A through resistor R10. The resistors R7 and R16 are connected in series, one end of the resistor R7 is connected with the current sampling resistor RT1, and the other end is connected with the 2 pin of the operational amplifier U2A. The 2 pin of the optocoupler U3 is connected with a resistor R15 to form a second auxiliary conversion circuit. The 3 pin of the optical coupler U3 is connected to the voltage feedback end TRM1 of the main conversion circuit, and the 4 pin of the optical coupler U3 is grounded. Resistor R17 is connected in parallel with capacitor C15 between pins 3 and 4 of optocoupler U3.
The voltage control circuit 8 collects drain voltage and source voltage of the MOS transistor Q1 using voltage dividing resistors. When the constant current source device outputs constant current, the output voltage is reduced, the output voltage of the operational amplifier U2A is increased, the optocoupler U3 is driven, the optocoupler U3 is equivalent to a parallel resistor, and the output voltage of the main conversion circuit is regulated to be reduced through the voltage feedback end TRM1 of the main conversion circuit. The voltage control circuit 8 mainly realizes a linear voltage drop function, so that when a constant current is output, the output voltage of the main conversion circuit is reduced along with the reduction of the output voltage of the constant current source device, and at the moment, the MOS tube has smaller power loss and higher efficiency when the constant current is output.
If the voltage control circuit is not provided, constant current output can be realized, but when the constant current is output, the MOS tube has larger loss, and the maximum loss is the product of the output voltage and the output current, so that long-time constant current use is not supported.
The composition and operation principle of the constant current source device of the present utility model are described above by way of a specific example. According to the technical scheme provided by the utility model, the output voltage and the output current of the constant current source device can be regulated simultaneously, so that high-precision constant current regulation is realized.
It will be further understood by those skilled in the art from the foregoing description of the present specification that terms such as "upper," "lower," and the like, which indicate an orientation or a positional relationship, are based on the orientation or positional relationship shown in the drawings of the present specification, are for convenience only in describing aspects of the present utility model and simplifying the description, and do not explicitly or implicitly refer to devices or elements that must have the particular orientation, be constructed and operated in the particular orientation, and thus the above orientation or positional relationship terms should not be interpreted or construed as limiting aspects of the present utility model.
The technical features of the above-described embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above-described embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples illustrate only a few embodiments of the utility model, which are described in detail and are not to be construed as limiting the scope of the claims. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the utility model, which are all within the scope of the utility model. Accordingly, the scope of protection of the present utility model is to be determined by the appended claims.
Claims (10)
1. A constant current source device, characterized by comprising: the DC-DC conversion circuit is connected with the power supply, and the output end of the DC-DC conversion circuit is connected with the input electrode of the switching tube;
the output electrode of the switching tube is connected with the output end of the constant current source device, and the control electrode of the switching tube is connected with the current control circuit;
the current control circuit comprises a current sampling circuit and a comparison circuit which are sequentially connected, the current sampling circuit is connected with the output end of the constant current source device, and the output end of the comparison circuit is connected with the control electrode of the switching tube;
the constant current source device also comprises a voltage control circuit, wherein one input end of the voltage control circuit is connected with the output end of the DC-DC conversion circuit, the other input end of the voltage control circuit is connected with the output end of the constant current source device, and the output end of the voltage control circuit is connected with the voltage feedback end of the DC-DC conversion circuit.
2. The constant current source device according to claim 1, wherein the switching tube is a MOS tube, a gate of the MOS tube is connected to the current control circuit, a drain of the MOS tube is connected to the output terminal of the DC-DC conversion circuit, and a source of the MOS tube is connected to the current sampling circuit.
3. The constant current source device according to claim 2, wherein the sampling circuit comprises a sampling resistor connected to the source of the MOS transistor, and an inverse proportion amplifying circuit connected to the sampling resistor; the inverse proportion amplifying circuit comprises an operational amplifier, wherein the inverting input end of the operational amplifier is connected with the sampling resistor, the non-inverting input end of the operational amplifier is grounded, and the output end of the operational amplifier is connected with the comparing circuit.
4. The constant current source device according to claim 3, wherein the comparing circuit comprises a comparator, an inverting input terminal of the comparator is connected to an output terminal of the inverse proportion amplifying circuit, a non-inverting input terminal of the comparator is connected to a reference voltage input terminal, and an output terminal of the comparator is connected to a gate of the MOS transistor.
5. The constant current source device according to claim 4, wherein the voltage control circuit comprises a voltage sampling circuit, an operational amplifier and a photo-coupler, the voltage sampling circuit samples the drain voltage and the source voltage of the MOS transistor and inputs them into the non-inverting input terminal and the inverting input terminal of the operational amplifier, respectively, the output terminal of the operational amplifier is connected to the input terminal of the photo-coupler, and the output terminal of the photo-coupler is connected to the voltage feedback terminal of the DC-DC conversion circuit.
6. The constant current source device according to claim 1, further comprising an input filter circuit, wherein the input filter circuit includes an inductor and a capacitor, the input filter circuit being connected to the input terminal of the DC-DC conversion circuit.
7. The constant current source device according to claim 5, further comprising an output filter circuit, wherein the output filter circuit includes a capacitor, and wherein the output filter circuit is connected between the DC-DC conversion circuit and the inverse ratio amplification circuit.
8. The constant current source device according to claim 6, further comprising an input anti-reverse circuit, wherein the input anti-reverse circuit comprises a diode, the input anti-reverse circuit being connected between the power supply and the input filter circuit.
9. The constant current source device according to claim 7, wherein the DC-DC conversion circuit includes a main conversion circuit, a first auxiliary conversion circuit, and a second auxiliary conversion circuit connected in parallel with each other, wherein an output terminal of the main conversion circuit is connected to a drain of the MOS transistor, an output terminal of the first auxiliary conversion circuit is connected to a positive power supply terminal of the operational amplifier in the inverse ratio amplification circuit, a positive power supply terminal of the comparator in the comparison circuit, and a positive power supply terminal of the operational amplifier in the voltage control circuit, and an output terminal of the second auxiliary conversion circuit is connected to a negative power supply terminal of the operational amplifier in the inverse ratio amplification circuit, a negative power supply terminal of the comparator in the comparison circuit, and an input terminal of the photocoupler in the voltage control circuit.
10. The constant current source device according to claim 4, wherein the reference voltage input terminal is connected to the MCU.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320500483.6U CN219435263U (en) | 2023-03-15 | 2023-03-15 | Constant current source device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320500483.6U CN219435263U (en) | 2023-03-15 | 2023-03-15 | Constant current source device |
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| CN219435263U true CN219435263U (en) | 2023-07-28 |
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