CN219395095U - Self-balancing constant current output unit circuit - Google Patents
Self-balancing constant current output unit circuit Download PDFInfo
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- CN219395095U CN219395095U CN202223434506.2U CN202223434506U CN219395095U CN 219395095 U CN219395095 U CN 219395095U CN 202223434506 U CN202223434506 U CN 202223434506U CN 219395095 U CN219395095 U CN 219395095U
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Abstract
The utility model discloses a self-balancing constant current output unit circuit in the field of circuits, which comprises a circuit main body, an input operational amplifier, a proportional amplifying circuit, a sampling feedback operational amplifier and a sampling resistor, wherein a resistor R1 is connected between the input operational amplifier and the input end of the circuit before voltage stabilization, the resistor R1 is connected to the positive input end of the input operational amplifier, the negative input end of the input operational amplifier is connected with the proportional amplifying circuit, a sampling resistor R0 is additionally arranged between the proportional amplifying circuit and the sampling feedback operational amplifier, one end of the sampling resistor R0 is connected with the negative input end of the sampling feedback operational amplifier, a resistor R4 is additionally arranged between the positive input end of the sampling feedback operational amplifier and the input operational amplifier, and the resistor R4 is connected in parallel with a circuit of the resistor R1. The self-balancing constant current output unit circuit provided by the utility model can effectively solve the defect that the load is open and the output is not fed back and turned off in time during constant current output in the prior art.
Description
Technical Field
The utility model relates to the field of circuits, in particular to a self-balancing constant current output unit circuit.
Background
At present, a constant-current power supply is generally adopted for driving a laser lighting lamp used in daily life, and an existing constant-current circuit is generally an LED constant-current circuit based on a switching power supply, and the LED constant-current circuit is used in a high-power occasion and has the defects of poor EMI effect, prominent switching spike signals, high circuit cost and the like; still another is an operational amplifier and transistor based LED constant current circuit that is used in low power applications but has low operating efficiency, less than 50%.
The triode controlled by the output end of the operational amplifier in the LED constant current circuit outputs a constant current source, and a sampling resistor is added to well output current, but when a load is opened, the operational amplifier cannot be effectively controlled to work in a normal state by feedback of the sampling resistor. For this reason, we propose a self-balancing constant current output unit circuit to solve the above-mentioned problems.
Disclosure of Invention
The utility model aims to solve the defect that the output is not fed back and turned off in time due to open load during constant current output in the prior art, and provides a self-balancing constant current output unit circuit.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
the utility model provides a self-balancing constant current output unit circuit, includes circuit main part, input operational amplifier, proportion amplifying circuit, sampling feedback operational amplifier and sampling resistor, be connected with resistance R1 between input operational amplifier and the steady voltage front circuit input, and resistance R1 electricity is connected in the high level end of input operational amplifier, and the low level end of input operational amplifier connects proportion amplifying circuit, adds sampling resistor R0 between proportion amplifying circuit and the sampling feedback operational amplifier to sampling resistor R0 one end inserts the low level end of sampling feedback operational amplifier, adds resistance R4 between the high level end of sampling feedback operational amplifier and the input operational amplifier, and in the parallelly connected circuit of switching-in resistance R1 of resistance R4.
Preferably, the proportional amplifying circuit resistor R2 and the resistor R3, and the current input ends of the resistor R2 and the resistor R3 are connected with the low-level end of the input operational amplifier.
Preferably, the current output end of the resistor R2 is connected to the common end of the ground terminal.
Preferably, the sampling resistor R0 is connected in series to the current output terminal of the resistor R3, and the sampling resistor R0 is connected to the output terminal of the circuit body.
Compared with the prior art, the utility model has the beneficial effects that:
the utility model is different from the traditional triode output constant current source controlled by the operational amplifier output end and adds a sampling resistor to output current, the voltage of the output end is collected in real time through sampling feedback operational amplifier, and the voltage is fed back and input to the input end of the input operational amplifier, even if the load is open, the input operational amplifier can keep stable work through sampling feedback, thereby solving the technical problem existing in the background center and being worthy of popularization and use in the existing market.
Drawings
FIG. 1 is a schematic diagram of the structure of the present utility model.
In the figure: 1-input operational amplifier, 2-proportional amplifying circuit, 3-sampling feedback operational amplifier and 4-sampling resistor.
Detailed Description
In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements 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 utility model.
In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the description of the present utility model, 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 above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments.
Referring to fig. 1, a self-balancing constant current output unit circuit includes a circuit body, an input operational amplifier 1, a proportional amplifying circuit 2, a sampling feedback operational amplifier 3 and a sampling resistor 4, wherein a resistor R1 is connected between the input operational amplifier 1 and an input end of a circuit before voltage stabilization, the resistor R1 is electrically connected to a high-level end of the input operational amplifier, a low-level end of the input operational amplifier 1 is connected with the proportional amplifying circuit 2, a sampling resistor R04 is additionally arranged between the proportional amplifying circuit 2 and the sampling feedback operational amplifier 3, one end of the sampling resistor R04 is connected to the low-level end of the sampling feedback operational amplifier 3, a resistor R4 is additionally arranged between the high-level end of the sampling feedback operational amplifier 3 and the input operational amplifier 1, the resistor R4 is connected in parallel to a circuit of the resistor R1, the resistor R2 and the resistor R3 are connected to a low-level end of the input operational amplifier 1, a current output end of the resistor R2 is connected to a common end of a ground end, and the sampling resistor R04 is connected in series to a current output end of the resistor R3, and the sampling resistor R04 is connected to an output end of the circuit body.
Referring to fig. 1 of the specification, the utility model is composed of an input operational amplifier 1, a proportional amplifying circuit 2, a sampling feedback operational amplifier 3 and a sampling resistor 4, wherein a negative feedback circuit is formed, when a load is opened, the circuit can work stably, and the relation between an output current (Iout) and an input voltage (Vin) is as follows:r1=r4, r2=r3 is required. The self-balancing constant current output unit circuit designed by the method collects the voltage of the output end in real time through sampling feedback operational amplifier and inputs the voltage to the input end of the input operational amplifier, namelyThe load is opened, and the input operational amplifier can be kept to work stably through sampling feedback.
The above examples are preferred embodiments of the present utility model, but the embodiments of the present utility model are not limited to the above examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present utility model should be made in the equivalent manner, and the embodiments are included in the protection scope of the present utility model.
In the description of the present utility model, it should be understood that the terms "orientation" or "positional relationship" are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and to simplify the description, rather than to indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operate in a particular orientation, and therefore should not be construed as limiting the utility model.
Claims (4)
1. The utility model provides a self-balancing constant current output unit circuit, includes circuit main part, input operational amplifier (1), proportional amplification circuit (2), sampling feedback operational amplifier (3) and sampling resistor (4), its characterized in that, be connected with resistance R1 between input operational amplifier (1) and the circuit input before the steady voltage, and resistance R1 electricity is connected in the positive input that input operational amplifier, and proportional amplification circuit (2) is connected to the negative input that input operational amplifier (1), add sampling resistor R0 (4) between proportional amplification circuit (2) and sampling feedback operational amplifier (3), and sampling resistor R0 (4) one end inserts the negative input that sampling feedback operational amplifier (3), add resistance R4 between the positive input that sampling feedback operational amplifier (3) and the input operational amplifier (1), and in the circuit of resistance R1 is connected in parallel.
2. A self-balancing constant current output unit circuit according to claim 1, wherein the proportional amplifying circuit (2) has a resistor R2 and a resistor R3, and the current input terminals of the resistor R2 and the resistor R3 are connected to the negative input terminal of the input operational amplifier (1).
3. A self-balancing constant current output unit circuit according to claim 2, wherein the current output terminal of the resistor R2 is connected to the common terminal of the ground terminal.
4. A self-balancing constant current output unit circuit according to claim 3, wherein the sampling resistor R0 (4) is connected in series to the current output terminal of the resistor R3, and the sampling resistor R0 (4) is connected to the output terminal of the circuit body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223434506.2U CN219395095U (en) | 2022-12-21 | 2022-12-21 | Self-balancing constant current output unit circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202223434506.2U CN219395095U (en) | 2022-12-21 | 2022-12-21 | Self-balancing constant current output unit circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219395095U true CN219395095U (en) | 2023-07-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202223434506.2U Active CN219395095U (en) | 2022-12-21 | 2022-12-21 | Self-balancing constant current output unit circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219395095U (en) |
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2022
- 2022-12-21 CN CN202223434506.2U patent/CN219395095U/en active Active
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